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llvm-project/clang/lib/Sema/SemaExpr.cpp
Yeoul Na 3eb9ff3095
Turn 'counted_by' into a type attribute and parse it into 'CountAttributedType' (#78000) 
In `-fbounds-safety`, bounds annotations are considered type attributes
rather than declaration attributes. Constructing them as type attributes
allows us to extend the attribute to apply nested pointers, which is
essential to annotate functions that involve out parameters: `void
foo(int *__counted_by(*out_count) *out_buf, int *out_count)`.

We introduce a new sugar type to support bounds annotated types,
`CountAttributedType`. In order to maintain extra data (the bounds
expression and the dependent declaration information) that is not
trackable in `AttributedType` we create a new type dedicate to this
functionality.

This patch also extends the parsing logic to parse the `counted_by`
argument as an expression, which will allow us to extend the model to
support arguments beyond an identifier, e.g., `__counted_by(n + m)` in
the future as specified by `-fbounds-safety`.

This also adjusts `__bdos` and array-bounds sanitizer code that already
uses `CountedByAttr` to check `CountAttributedType` instead to get the
field referred to by the attribute.
2024-03-20 13:36:56 +09:00

21996 lines
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//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for expressions.
//
//===----------------------------------------------------------------------===//
#include "TreeTransform.h"
#include "UsedDeclVisitor.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/EvaluatedExprVisitor.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ExprOpenMP.h"
#include "clang/AST/OperationKinds.h"
#include "clang/AST/ParentMapContext.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/Type.h"
#include "clang/AST/TypeLoc.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/DiagnosticSema.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Specifiers.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TypeTraits.h"
#include "clang/Lex/LiteralSupport.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/AnalysisBasedWarnings.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Sema/Designator.h"
#include "clang/Sema/EnterExpressionEvaluationContext.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Overload.h"
#include "clang/Sema/ParsedTemplate.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaFixItUtils.h"
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/Template.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/TypeSize.h"
#include <optional>
using namespace clang;
using namespace sema;
/// Determine whether the use of this declaration is valid, without
/// emitting diagnostics.
bool Sema::CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid) {
// See if this is an auto-typed variable whose initializer we are parsing.
if (ParsingInitForAutoVars.count(D))
return false;
// See if this is a deleted function.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
if (FD->isDeleted())
return false;
// If the function has a deduced return type, and we can't deduce it,
// then we can't use it either.
if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
DeduceReturnType(FD, SourceLocation(), /*Diagnose*/ false))
return false;
// See if this is an aligned allocation/deallocation function that is
// unavailable.
if (TreatUnavailableAsInvalid &&
isUnavailableAlignedAllocationFunction(*FD))
return false;
}
// See if this function is unavailable.
if (TreatUnavailableAsInvalid && D->getAvailability() == AR_Unavailable &&
cast<Decl>(CurContext)->getAvailability() != AR_Unavailable)
return false;
if (isa<UnresolvedUsingIfExistsDecl>(D))
return false;
return true;
}
static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc) {
// Warn if this is used but marked unused.
if (const auto *A = D->getAttr<UnusedAttr>()) {
// [[maybe_unused]] should not diagnose uses, but __attribute__((unused))
// should diagnose them.
if (A->getSemanticSpelling() != UnusedAttr::CXX11_maybe_unused &&
A->getSemanticSpelling() != UnusedAttr::C23_maybe_unused) {
const Decl *DC = cast_or_null<Decl>(S.getCurObjCLexicalContext());
if (DC && !DC->hasAttr<UnusedAttr>())
S.Diag(Loc, diag::warn_used_but_marked_unused) << D;
}
}
}
/// Emit a note explaining that this function is deleted.
void Sema::NoteDeletedFunction(FunctionDecl *Decl) {
assert(Decl && Decl->isDeleted());
if (Decl->isDefaulted()) {
// If the method was explicitly defaulted, point at that declaration.
if (!Decl->isImplicit())
Diag(Decl->getLocation(), diag::note_implicitly_deleted);
// Try to diagnose why this special member function was implicitly
// deleted. This might fail, if that reason no longer applies.
DiagnoseDeletedDefaultedFunction(Decl);
return;
}
auto *Ctor = dyn_cast<CXXConstructorDecl>(Decl);
if (Ctor && Ctor->isInheritingConstructor())
return NoteDeletedInheritingConstructor(Ctor);
Diag(Decl->getLocation(), diag::note_availability_specified_here)
<< Decl << 1;
}
/// Determine whether a FunctionDecl was ever declared with an
/// explicit storage class.
static bool hasAnyExplicitStorageClass(const FunctionDecl *D) {
for (auto *I : D->redecls()) {
if (I->getStorageClass() != SC_None)
return true;
}
return false;
}
/// Check whether we're in an extern inline function and referring to a
/// variable or function with internal linkage (C11 6.7.4p3).
///
/// This is only a warning because we used to silently accept this code, but
/// in many cases it will not behave correctly. This is not enabled in C++ mode
/// because the restriction language is a bit weaker (C++11 [basic.def.odr]p6)
/// and so while there may still be user mistakes, most of the time we can't
/// prove that there are errors.
static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S,
const NamedDecl *D,
SourceLocation Loc) {
// This is disabled under C++; there are too many ways for this to fire in
// contexts where the warning is a false positive, or where it is technically
// correct but benign.
if (S.getLangOpts().CPlusPlus)
return;
// Check if this is an inlined function or method.
FunctionDecl *Current = S.getCurFunctionDecl();
if (!Current)
return;
if (!Current->isInlined())
return;
if (!Current->isExternallyVisible())
return;
// Check if the decl has internal linkage.
if (D->getFormalLinkage() != Linkage::Internal)
return;
// Downgrade from ExtWarn to Extension if
// (1) the supposedly external inline function is in the main file,
// and probably won't be included anywhere else.
// (2) the thing we're referencing is a pure function.
// (3) the thing we're referencing is another inline function.
// This last can give us false negatives, but it's better than warning on
// wrappers for simple C library functions.
const FunctionDecl *UsedFn = dyn_cast<FunctionDecl>(D);
bool DowngradeWarning = S.getSourceManager().isInMainFile(Loc);
if (!DowngradeWarning && UsedFn)
DowngradeWarning = UsedFn->isInlined() || UsedFn->hasAttr<ConstAttr>();
S.Diag(Loc, DowngradeWarning ? diag::ext_internal_in_extern_inline_quiet
: diag::ext_internal_in_extern_inline)
<< /*IsVar=*/!UsedFn << D;
S.MaybeSuggestAddingStaticToDecl(Current);
S.Diag(D->getCanonicalDecl()->getLocation(), diag::note_entity_declared_at)
<< D;
}
void Sema::MaybeSuggestAddingStaticToDecl(const FunctionDecl *Cur) {
const FunctionDecl *First = Cur->getFirstDecl();
// Suggest "static" on the function, if possible.
if (!hasAnyExplicitStorageClass(First)) {
SourceLocation DeclBegin = First->getSourceRange().getBegin();
Diag(DeclBegin, diag::note_convert_inline_to_static)
<< Cur << FixItHint::CreateInsertion(DeclBegin, "static ");
}
}
/// Determine whether the use of this declaration is valid, and
/// emit any corresponding diagnostics.
///
/// This routine diagnoses various problems with referencing
/// declarations that can occur when using a declaration. For example,
/// it might warn if a deprecated or unavailable declaration is being
/// used, or produce an error (and return true) if a C++0x deleted
/// function is being used.
///
/// \returns true if there was an error (this declaration cannot be
/// referenced), false otherwise.
///
bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
const ObjCInterfaceDecl *UnknownObjCClass,
bool ObjCPropertyAccess,
bool AvoidPartialAvailabilityChecks,
ObjCInterfaceDecl *ClassReceiver,
bool SkipTrailingRequiresClause) {
SourceLocation Loc = Locs.front();
if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) {
// If there were any diagnostics suppressed by template argument deduction,
// emit them now.
auto Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
if (Pos != SuppressedDiagnostics.end()) {
for (const PartialDiagnosticAt &Suppressed : Pos->second)
Diag(Suppressed.first, Suppressed.second);
// Clear out the list of suppressed diagnostics, so that we don't emit
// them again for this specialization. However, we don't obsolete this
// entry from the table, because we want to avoid ever emitting these
// diagnostics again.
Pos->second.clear();
}
// C++ [basic.start.main]p3:
// The function 'main' shall not be used within a program.
if (cast<FunctionDecl>(D)->isMain())
Diag(Loc, diag::ext_main_used);
diagnoseUnavailableAlignedAllocation(*cast<FunctionDecl>(D), Loc);
}
// See if this is an auto-typed variable whose initializer we are parsing.
if (ParsingInitForAutoVars.count(D)) {
if (isa<BindingDecl>(D)) {
Diag(Loc, diag::err_binding_cannot_appear_in_own_initializer)
<< D->getDeclName();
} else {
Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
<< D->getDeclName() << cast<VarDecl>(D)->getType();
}
return true;
}
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
// See if this is a deleted function.
if (FD->isDeleted()) {
auto *Ctor = dyn_cast<CXXConstructorDecl>(FD);
if (Ctor && Ctor->isInheritingConstructor())
Diag(Loc, diag::err_deleted_inherited_ctor_use)
<< Ctor->getParent()
<< Ctor->getInheritedConstructor().getConstructor()->getParent();
else
Diag(Loc, diag::err_deleted_function_use);
NoteDeletedFunction(FD);
return true;
}
// [expr.prim.id]p4
// A program that refers explicitly or implicitly to a function with a
// trailing requires-clause whose constraint-expression is not satisfied,
// other than to declare it, is ill-formed. [...]
//
// See if this is a function with constraints that need to be satisfied.
// Check this before deducing the return type, as it might instantiate the
// definition.
if (!SkipTrailingRequiresClause && FD->getTrailingRequiresClause()) {
ConstraintSatisfaction Satisfaction;
if (CheckFunctionConstraints(FD, Satisfaction, Loc,
/*ForOverloadResolution*/ true))
// A diagnostic will have already been generated (non-constant
// constraint expression, for example)
return true;
if (!Satisfaction.IsSatisfied) {
Diag(Loc,
diag::err_reference_to_function_with_unsatisfied_constraints)
<< D;
DiagnoseUnsatisfiedConstraint(Satisfaction);
return true;
}
}
// If the function has a deduced return type, and we can't deduce it,
// then we can't use it either.
if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
DeduceReturnType(FD, Loc))
return true;
if (getLangOpts().CUDA && !CheckCUDACall(Loc, FD))
return true;
}
if (auto *MD = dyn_cast<CXXMethodDecl>(D)) {
// Lambdas are only default-constructible or assignable in C++2a onwards.
if (MD->getParent()->isLambda() &&
((isa<CXXConstructorDecl>(MD) &&
cast<CXXConstructorDecl>(MD)->isDefaultConstructor()) ||
MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) {
Diag(Loc, diag::warn_cxx17_compat_lambda_def_ctor_assign)
<< !isa<CXXConstructorDecl>(MD);
}
}
auto getReferencedObjCProp = [](const NamedDecl *D) ->
const ObjCPropertyDecl * {
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->findPropertyDecl();
return nullptr;
};
if (const ObjCPropertyDecl *ObjCPDecl = getReferencedObjCProp(D)) {
if (diagnoseArgIndependentDiagnoseIfAttrs(ObjCPDecl, Loc))
return true;
} else if (diagnoseArgIndependentDiagnoseIfAttrs(D, Loc)) {
return true;
}
// [OpenMP 4.0], 2.15 declare reduction Directive, Restrictions
// Only the variables omp_in and omp_out are allowed in the combiner.
// Only the variables omp_priv and omp_orig are allowed in the
// initializer-clause.
auto *DRD = dyn_cast<OMPDeclareReductionDecl>(CurContext);
if (LangOpts.OpenMP && DRD && !CurContext->containsDecl(D) &&
isa<VarDecl>(D)) {
Diag(Loc, diag::err_omp_wrong_var_in_declare_reduction)
<< getCurFunction()->HasOMPDeclareReductionCombiner;
Diag(D->getLocation(), diag::note_entity_declared_at) << D;
return true;
}
// [OpenMP 5.0], 2.19.7.3. declare mapper Directive, Restrictions
// List-items in map clauses on this construct may only refer to the declared
// variable var and entities that could be referenced by a procedure defined
// at the same location.
// [OpenMP 5.2] Also allow iterator declared variables.
if (LangOpts.OpenMP && isa<VarDecl>(D) &&
!isOpenMPDeclareMapperVarDeclAllowed(cast<VarDecl>(D))) {
Diag(Loc, diag::err_omp_declare_mapper_wrong_var)
<< getOpenMPDeclareMapperVarName();
Diag(D->getLocation(), diag::note_entity_declared_at) << D;
return true;
}
if (const auto *EmptyD = dyn_cast<UnresolvedUsingIfExistsDecl>(D)) {
Diag(Loc, diag::err_use_of_empty_using_if_exists);
Diag(EmptyD->getLocation(), diag::note_empty_using_if_exists_here);
return true;
}
DiagnoseAvailabilityOfDecl(D, Locs, UnknownObjCClass, ObjCPropertyAccess,
AvoidPartialAvailabilityChecks, ClassReceiver);
DiagnoseUnusedOfDecl(*this, D, Loc);
diagnoseUseOfInternalDeclInInlineFunction(*this, D, Loc);
if (D->hasAttr<AvailableOnlyInDefaultEvalMethodAttr>()) {
if (getLangOpts().getFPEvalMethod() !=
LangOptions::FPEvalMethodKind::FEM_UnsetOnCommandLine &&
PP.getLastFPEvalPragmaLocation().isValid() &&
PP.getCurrentFPEvalMethod() != getLangOpts().getFPEvalMethod())
Diag(D->getLocation(),
diag::err_type_available_only_in_default_eval_method)
<< D->getName();
}
if (auto *VD = dyn_cast<ValueDecl>(D))
checkTypeSupport(VD->getType(), Loc, VD);
if (LangOpts.SYCLIsDevice ||
(LangOpts.OpenMP && LangOpts.OpenMPIsTargetDevice)) {
if (!Context.getTargetInfo().isTLSSupported())
if (const auto *VD = dyn_cast<VarDecl>(D))
if (VD->getTLSKind() != VarDecl::TLS_None)
targetDiag(*Locs.begin(), diag::err_thread_unsupported);
}
if (isa<ParmVarDecl>(D) && isa<RequiresExprBodyDecl>(D->getDeclContext()) &&
!isUnevaluatedContext()) {
// C++ [expr.prim.req.nested] p3
// A local parameter shall only appear as an unevaluated operand
// (Clause 8) within the constraint-expression.
Diag(Loc, diag::err_requires_expr_parameter_referenced_in_evaluated_context)
<< D;
Diag(D->getLocation(), diag::note_entity_declared_at) << D;
return true;
}
return false;
}
/// DiagnoseSentinelCalls - This routine checks whether a call or
/// message-send is to a declaration with the sentinel attribute, and
/// if so, it checks that the requirements of the sentinel are
/// satisfied.
void Sema::DiagnoseSentinelCalls(const NamedDecl *D, SourceLocation Loc,
ArrayRef<Expr *> Args) {
const SentinelAttr *Attr = D->getAttr<SentinelAttr>();
if (!Attr)
return;
// The number of formal parameters of the declaration.
unsigned NumFormalParams;
// The kind of declaration. This is also an index into a %select in
// the diagnostic.
enum { CK_Function, CK_Method, CK_Block } CalleeKind;
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
NumFormalParams = MD->param_size();
CalleeKind = CK_Method;
} else if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
NumFormalParams = FD->param_size();
CalleeKind = CK_Function;
} else if (const auto *VD = dyn_cast<VarDecl>(D)) {
QualType Ty = VD->getType();
const FunctionType *Fn = nullptr;
if (const auto *PtrTy = Ty->getAs<PointerType>()) {
Fn = PtrTy->getPointeeType()->getAs<FunctionType>();
if (!Fn)
return;
CalleeKind = CK_Function;
} else if (const auto *PtrTy = Ty->getAs<BlockPointerType>()) {
Fn = PtrTy->getPointeeType()->castAs<FunctionType>();
CalleeKind = CK_Block;
} else {
return;
}
if (const auto *proto = dyn_cast<FunctionProtoType>(Fn))
NumFormalParams = proto->getNumParams();
else
NumFormalParams = 0;
} else {
return;
}
// "NullPos" is the number of formal parameters at the end which
// effectively count as part of the variadic arguments. This is
// useful if you would prefer to not have *any* formal parameters,
// but the language forces you to have at least one.
unsigned NullPos = Attr->getNullPos();
assert((NullPos == 0 || NullPos == 1) && "invalid null position on sentinel");
NumFormalParams = (NullPos > NumFormalParams ? 0 : NumFormalParams - NullPos);
// The number of arguments which should follow the sentinel.
unsigned NumArgsAfterSentinel = Attr->getSentinel();
// If there aren't enough arguments for all the formal parameters,
// the sentinel, and the args after the sentinel, complain.
if (Args.size() < NumFormalParams + NumArgsAfterSentinel + 1) {
Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Diag(D->getLocation(), diag::note_sentinel_here) << int(CalleeKind);
return;
}
// Otherwise, find the sentinel expression.
const Expr *SentinelExpr = Args[Args.size() - NumArgsAfterSentinel - 1];
if (!SentinelExpr)
return;
if (SentinelExpr->isValueDependent())
return;
if (Context.isSentinelNullExpr(SentinelExpr))
return;
// Pick a reasonable string to insert. Optimistically use 'nil', 'nullptr',
// or 'NULL' if those are actually defined in the context. Only use
// 'nil' for ObjC methods, where it's much more likely that the
// variadic arguments form a list of object pointers.
SourceLocation MissingNilLoc = getLocForEndOfToken(SentinelExpr->getEndLoc());
std::string NullValue;
if (CalleeKind == CK_Method && PP.isMacroDefined("nil"))
NullValue = "nil";
else if (getLangOpts().CPlusPlus11)
NullValue = "nullptr";
else if (PP.isMacroDefined("NULL"))
NullValue = "NULL";
else
NullValue = "(void*) 0";
if (MissingNilLoc.isInvalid())
Diag(Loc, diag::warn_missing_sentinel) << int(CalleeKind);
else
Diag(MissingNilLoc, diag::warn_missing_sentinel)
<< int(CalleeKind)
<< FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
Diag(D->getLocation(), diag::note_sentinel_here)
<< int(CalleeKind) << Attr->getRange();
}
SourceRange Sema::getExprRange(Expr *E) const {
return E ? E->getSourceRange() : SourceRange();
}
//===----------------------------------------------------------------------===//
// Standard Promotions and Conversions
//===----------------------------------------------------------------------===//
/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
ExprResult Sema::DefaultFunctionArrayConversion(Expr *E, bool Diagnose) {
// Handle any placeholder expressions which made it here.
if (E->hasPlaceholderType()) {
ExprResult result = CheckPlaceholderExpr(E);
if (result.isInvalid()) return ExprError();
E = result.get();
}
QualType Ty = E->getType();
assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
if (Ty->isFunctionType()) {
if (auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()))
if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl()))
if (!checkAddressOfFunctionIsAvailable(FD, Diagnose, E->getExprLoc()))
return ExprError();
E = ImpCastExprToType(E, Context.getPointerType(Ty),
CK_FunctionToPointerDecay).get();
} else if (Ty->isArrayType()) {
// In C90 mode, arrays only promote to pointers if the array expression is
// an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
// type 'array of type' is converted to an expression that has type 'pointer
// to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
// that has type 'array of type' ...". The relevant change is "an lvalue"
// (C90) to "an expression" (C99).
//
// C++ 4.2p1:
// An lvalue or rvalue of type "array of N T" or "array of unknown bound of
// T" can be converted to an rvalue of type "pointer to T".
//
if (getLangOpts().C99 || getLangOpts().CPlusPlus || E->isLValue()) {
ExprResult Res = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
CK_ArrayToPointerDecay);
if (Res.isInvalid())
return ExprError();
E = Res.get();
}
}
return E;
}
static void CheckForNullPointerDereference(Sema &S, Expr *E) {
// Check to see if we are dereferencing a null pointer. If so,
// and if not volatile-qualified, this is undefined behavior that the
// optimizer will delete, so warn about it. People sometimes try to use this
// to get a deterministic trap and are surprised by clang's behavior. This
// only handles the pattern "*null", which is a very syntactic check.
const auto *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts());
if (UO && UO->getOpcode() == UO_Deref &&
UO->getSubExpr()->getType()->isPointerType()) {
const LangAS AS =
UO->getSubExpr()->getType()->getPointeeType().getAddressSpace();
if ((!isTargetAddressSpace(AS) ||
(isTargetAddressSpace(AS) && toTargetAddressSpace(AS) == 0)) &&
UO->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant(
S.Context, Expr::NPC_ValueDependentIsNotNull) &&
!UO->getType().isVolatileQualified()) {
S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
S.PDiag(diag::warn_indirection_through_null)
<< UO->getSubExpr()->getSourceRange());
S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
S.PDiag(diag::note_indirection_through_null));
}
}
}
static void DiagnoseDirectIsaAccess(Sema &S, const ObjCIvarRefExpr *OIRE,
SourceLocation AssignLoc,
const Expr* RHS) {
const ObjCIvarDecl *IV = OIRE->getDecl();
if (!IV)
return;
DeclarationName MemberName = IV->getDeclName();
IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
if (!Member || !Member->isStr("isa"))
return;
const Expr *Base = OIRE->getBase();
QualType BaseType = Base->getType();
if (OIRE->isArrow())
BaseType = BaseType->getPointeeType();
if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>())
if (ObjCInterfaceDecl *IDecl = OTy->getInterface()) {
ObjCInterfaceDecl *ClassDeclared = nullptr;
ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
if (!ClassDeclared->getSuperClass()
&& (*ClassDeclared->ivar_begin()) == IV) {
if (RHS) {
NamedDecl *ObjectSetClass =
S.LookupSingleName(S.TUScope,
&S.Context.Idents.get("object_setClass"),
SourceLocation(), S.LookupOrdinaryName);
if (ObjectSetClass) {
SourceLocation RHSLocEnd = S.getLocForEndOfToken(RHS->getEndLoc());
S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_assign)
<< FixItHint::CreateInsertion(OIRE->getBeginLoc(),
"object_setClass(")
<< FixItHint::CreateReplacement(
SourceRange(OIRE->getOpLoc(), AssignLoc), ",")
<< FixItHint::CreateInsertion(RHSLocEnd, ")");
}
else
S.Diag(OIRE->getLocation(), diag::warn_objc_isa_assign);
} else {
NamedDecl *ObjectGetClass =
S.LookupSingleName(S.TUScope,
&S.Context.Idents.get("object_getClass"),
SourceLocation(), S.LookupOrdinaryName);
if (ObjectGetClass)
S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_use)
<< FixItHint::CreateInsertion(OIRE->getBeginLoc(),
"object_getClass(")
<< FixItHint::CreateReplacement(
SourceRange(OIRE->getOpLoc(), OIRE->getEndLoc()), ")");
else
S.Diag(OIRE->getLocation(), diag::warn_objc_isa_use);
}
S.Diag(IV->getLocation(), diag::note_ivar_decl);
}
}
}
ExprResult Sema::DefaultLvalueConversion(Expr *E) {
// Handle any placeholder expressions which made it here.
if (E->hasPlaceholderType()) {
ExprResult result = CheckPlaceholderExpr(E);
if (result.isInvalid()) return ExprError();
E = result.get();
}
// C++ [conv.lval]p1:
// A glvalue of a non-function, non-array type T can be
// converted to a prvalue.
if (!E->isGLValue()) return E;
QualType T = E->getType();
assert(!T.isNull() && "r-value conversion on typeless expression?");
// lvalue-to-rvalue conversion cannot be applied to function or array types.
if (T->isFunctionType() || T->isArrayType())
return E;
// We don't want to throw lvalue-to-rvalue casts on top of
// expressions of certain types in C++.
if (getLangOpts().CPlusPlus &&
(E->getType() == Context.OverloadTy ||
T->isDependentType() ||
T->isRecordType()))
return E;
// The C standard is actually really unclear on this point, and
// DR106 tells us what the result should be but not why. It's
// generally best to say that void types just doesn't undergo
// lvalue-to-rvalue at all. Note that expressions of unqualified
// 'void' type are never l-values, but qualified void can be.
if (T->isVoidType())
return E;
// OpenCL usually rejects direct accesses to values of 'half' type.
if (getLangOpts().OpenCL &&
!getOpenCLOptions().isAvailableOption("cl_khr_fp16", getLangOpts()) &&
T->isHalfType()) {
Diag(E->getExprLoc(), diag::err_opencl_half_load_store)
<< 0 << T;
return ExprError();
}
CheckForNullPointerDereference(*this, E);
if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(E->IgnoreParenCasts())) {
NamedDecl *ObjectGetClass = LookupSingleName(TUScope,
&Context.Idents.get("object_getClass"),
SourceLocation(), LookupOrdinaryName);
if (ObjectGetClass)
Diag(E->getExprLoc(), diag::warn_objc_isa_use)
<< FixItHint::CreateInsertion(OISA->getBeginLoc(), "object_getClass(")
<< FixItHint::CreateReplacement(
SourceRange(OISA->getOpLoc(), OISA->getIsaMemberLoc()), ")");
else
Diag(E->getExprLoc(), diag::warn_objc_isa_use);
}
else if (const ObjCIvarRefExpr *OIRE =
dyn_cast<ObjCIvarRefExpr>(E->IgnoreParenCasts()))
DiagnoseDirectIsaAccess(*this, OIRE, SourceLocation(), /* Expr*/nullptr);
// C++ [conv.lval]p1:
// [...] If T is a non-class type, the type of the prvalue is the
// cv-unqualified version of T. Otherwise, the type of the
// rvalue is T.
//
// C99 6.3.2.1p2:
// If the lvalue has qualified type, the value has the unqualified
// version of the type of the lvalue; otherwise, the value has the
// type of the lvalue.
if (T.hasQualifiers())
T = T.getUnqualifiedType();
// Under the MS ABI, lock down the inheritance model now.
if (T->isMemberPointerType() &&
Context.getTargetInfo().getCXXABI().isMicrosoft())
(void)isCompleteType(E->getExprLoc(), T);
ExprResult Res = CheckLValueToRValueConversionOperand(E);
if (Res.isInvalid())
return Res;
E = Res.get();
// Loading a __weak object implicitly retains the value, so we need a cleanup to
// balance that.
if (E->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
Cleanup.setExprNeedsCleanups(true);
if (E->getType().isDestructedType() == QualType::DK_nontrivial_c_struct)
Cleanup.setExprNeedsCleanups(true);
// C++ [conv.lval]p3:
// If T is cv std::nullptr_t, the result is a null pointer constant.
CastKind CK = T->isNullPtrType() ? CK_NullToPointer : CK_LValueToRValue;
Res = ImplicitCastExpr::Create(Context, T, CK, E, nullptr, VK_PRValue,
CurFPFeatureOverrides());
// C11 6.3.2.1p2:
// ... if the lvalue has atomic type, the value has the non-atomic version
// of the type of the lvalue ...
if (const AtomicType *Atomic = T->getAs<AtomicType>()) {
T = Atomic->getValueType().getUnqualifiedType();
Res = ImplicitCastExpr::Create(Context, T, CK_AtomicToNonAtomic, Res.get(),
nullptr, VK_PRValue, FPOptionsOverride());
}
return Res;
}
ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose) {
ExprResult Res = DefaultFunctionArrayConversion(E, Diagnose);
if (Res.isInvalid())
return ExprError();
Res = DefaultLvalueConversion(Res.get());
if (Res.isInvalid())
return ExprError();
return Res;
}
/// CallExprUnaryConversions - a special case of an unary conversion
/// performed on a function designator of a call expression.
ExprResult Sema::CallExprUnaryConversions(Expr *E) {
QualType Ty = E->getType();
ExprResult Res = E;
// Only do implicit cast for a function type, but not for a pointer
// to function type.
if (Ty->isFunctionType()) {
Res = ImpCastExprToType(E, Context.getPointerType(Ty),
CK_FunctionToPointerDecay);
if (Res.isInvalid())
return ExprError();
}
Res = DefaultLvalueConversion(Res.get());
if (Res.isInvalid())
return ExprError();
return Res.get();
}
/// UsualUnaryConversions - Performs various conversions that are common to most
/// operators (C99 6.3). The conversions of array and function types are
/// sometimes suppressed. For example, the array->pointer conversion doesn't
/// apply if the array is an argument to the sizeof or address (&) operators.
/// In these instances, this routine should *not* be called.
ExprResult Sema::UsualUnaryConversions(Expr *E) {
// First, convert to an r-value.
ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
if (Res.isInvalid())
return ExprError();
E = Res.get();
QualType Ty = E->getType();
assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
LangOptions::FPEvalMethodKind EvalMethod = CurFPFeatures.getFPEvalMethod();
if (EvalMethod != LangOptions::FEM_Source && Ty->isFloatingType() &&
(getLangOpts().getFPEvalMethod() !=
LangOptions::FPEvalMethodKind::FEM_UnsetOnCommandLine ||
PP.getLastFPEvalPragmaLocation().isValid())) {
switch (EvalMethod) {
default:
llvm_unreachable("Unrecognized float evaluation method");
break;
case LangOptions::FEM_UnsetOnCommandLine:
llvm_unreachable("Float evaluation method should be set by now");
break;
case LangOptions::FEM_Double:
if (Context.getFloatingTypeOrder(Context.DoubleTy, Ty) > 0)
// Widen the expression to double.
return Ty->isComplexType()
? ImpCastExprToType(E,
Context.getComplexType(Context.DoubleTy),
CK_FloatingComplexCast)
: ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast);
break;
case LangOptions::FEM_Extended:
if (Context.getFloatingTypeOrder(Context.LongDoubleTy, Ty) > 0)
// Widen the expression to long double.
return Ty->isComplexType()
? ImpCastExprToType(
E, Context.getComplexType(Context.LongDoubleTy),
CK_FloatingComplexCast)
: ImpCastExprToType(E, Context.LongDoubleTy,
CK_FloatingCast);
break;
}
}
// Half FP have to be promoted to float unless it is natively supported
if (Ty->isHalfType() && !getLangOpts().NativeHalfType)
return ImpCastExprToType(Res.get(), Context.FloatTy, CK_FloatingCast);
// Try to perform integral promotions if the object has a theoretically
// promotable type.
if (Ty->isIntegralOrUnscopedEnumerationType()) {
// C99 6.3.1.1p2:
//
// The following may be used in an expression wherever an int or
// unsigned int may be used:
// - an object or expression with an integer type whose integer
// conversion rank is less than or equal to the rank of int
// and unsigned int.
// - A bit-field of type _Bool, int, signed int, or unsigned int.
//
// If an int can represent all values of the original type, the
// value is converted to an int; otherwise, it is converted to an
// unsigned int. These are called the integer promotions. All
// other types are unchanged by the integer promotions.
QualType PTy = Context.isPromotableBitField(E);
if (!PTy.isNull()) {
E = ImpCastExprToType(E, PTy, CK_IntegralCast).get();
return E;
}
if (Context.isPromotableIntegerType(Ty)) {
QualType PT = Context.getPromotedIntegerType(Ty);
E = ImpCastExprToType(E, PT, CK_IntegralCast).get();
return E;
}
}
return E;
}
/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
/// do not have a prototype. Arguments that have type float or __fp16
/// are promoted to double. All other argument types are converted by
/// UsualUnaryConversions().
ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
QualType Ty = E->getType();
assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
ExprResult Res = UsualUnaryConversions(E);
if (Res.isInvalid())
return ExprError();
E = Res.get();
// If this is a 'float' or '__fp16' (CVR qualified or typedef)
// promote to double.
// Note that default argument promotion applies only to float (and
// half/fp16); it does not apply to _Float16.
const BuiltinType *BTy = Ty->getAs<BuiltinType>();
if (BTy && (BTy->getKind() == BuiltinType::Half ||
BTy->getKind() == BuiltinType::Float)) {
if (getLangOpts().OpenCL &&
!getOpenCLOptions().isAvailableOption("cl_khr_fp64", getLangOpts())) {
if (BTy->getKind() == BuiltinType::Half) {
E = ImpCastExprToType(E, Context.FloatTy, CK_FloatingCast).get();
}
} else {
E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).get();
}
}
if (BTy &&
getLangOpts().getExtendIntArgs() ==
LangOptions::ExtendArgsKind::ExtendTo64 &&
Context.getTargetInfo().supportsExtendIntArgs() && Ty->isIntegerType() &&
Context.getTypeSizeInChars(BTy) <
Context.getTypeSizeInChars(Context.LongLongTy)) {
E = (Ty->isUnsignedIntegerType())
? ImpCastExprToType(E, Context.UnsignedLongLongTy, CK_IntegralCast)
.get()
: ImpCastExprToType(E, Context.LongLongTy, CK_IntegralCast).get();
assert(8 == Context.getTypeSizeInChars(Context.LongLongTy).getQuantity() &&
"Unexpected typesize for LongLongTy");
}
// C++ performs lvalue-to-rvalue conversion as a default argument
// promotion, even on class types, but note:
// C++11 [conv.lval]p2:
// When an lvalue-to-rvalue conversion occurs in an unevaluated
// operand or a subexpression thereof the value contained in the
// referenced object is not accessed. Otherwise, if the glvalue
// has a class type, the conversion copy-initializes a temporary
// of type T from the glvalue and the result of the conversion
// is a prvalue for the temporary.
// FIXME: add some way to gate this entire thing for correctness in
// potentially potentially evaluated contexts.
if (getLangOpts().CPlusPlus && E->isGLValue() && !isUnevaluatedContext()) {
ExprResult Temp = PerformCopyInitialization(
InitializedEntity::InitializeTemporary(E->getType()),
E->getExprLoc(), E);
if (Temp.isInvalid())
return ExprError();
E = Temp.get();
}
return E;
}
/// Determine the degree of POD-ness for an expression.
/// Incomplete types are considered POD, since this check can be performed
/// when we're in an unevaluated context.
Sema::VarArgKind Sema::isValidVarArgType(const QualType &Ty) {
if (Ty->isIncompleteType()) {
// C++11 [expr.call]p7:
// After these conversions, if the argument does not have arithmetic,
// enumeration, pointer, pointer to member, or class type, the program
// is ill-formed.
//
// Since we've already performed array-to-pointer and function-to-pointer
// decay, the only such type in C++ is cv void. This also handles
// initializer lists as variadic arguments.
if (Ty->isVoidType())
return VAK_Invalid;
if (Ty->isObjCObjectType())
return VAK_Invalid;
return VAK_Valid;
}
if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
return VAK_Invalid;
if (Context.getTargetInfo().getTriple().isWasm() &&
Ty.isWebAssemblyReferenceType()) {
return VAK_Invalid;
}
if (Ty.isCXX98PODType(Context))
return VAK_Valid;
// C++11 [expr.call]p7:
// Passing a potentially-evaluated argument of class type (Clause 9)
// having a non-trivial copy constructor, a non-trivial move constructor,
// or a non-trivial destructor, with no corresponding parameter,
// is conditionally-supported with implementation-defined semantics.
if (getLangOpts().CPlusPlus11 && !Ty->isDependentType())
if (CXXRecordDecl *Record = Ty->getAsCXXRecordDecl())
if (!Record->hasNonTrivialCopyConstructor() &&
!Record->hasNonTrivialMoveConstructor() &&
!Record->hasNonTrivialDestructor())
return VAK_ValidInCXX11;
if (getLangOpts().ObjCAutoRefCount && Ty->isObjCLifetimeType())
return VAK_Valid;
if (Ty->isObjCObjectType())
return VAK_Invalid;
if (getLangOpts().MSVCCompat)
return VAK_MSVCUndefined;
// FIXME: In C++11, these cases are conditionally-supported, meaning we're
// permitted to reject them. We should consider doing so.
return VAK_Undefined;
}
void Sema::checkVariadicArgument(const Expr *E, VariadicCallType CT) {
// Don't allow one to pass an Objective-C interface to a vararg.
const QualType &Ty = E->getType();
VarArgKind VAK = isValidVarArgType(Ty);
// Complain about passing non-POD types through varargs.
switch (VAK) {
case VAK_ValidInCXX11:
DiagRuntimeBehavior(
E->getBeginLoc(), nullptr,
PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg) << Ty << CT);
[[fallthrough]];
case VAK_Valid:
if (Ty->isRecordType()) {
// This is unlikely to be what the user intended. If the class has a
// 'c_str' member function, the user probably meant to call that.
DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
PDiag(diag::warn_pass_class_arg_to_vararg)
<< Ty << CT << hasCStrMethod(E) << ".c_str()");
}
break;
case VAK_Undefined:
case VAK_MSVCUndefined:
DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
<< getLangOpts().CPlusPlus11 << Ty << CT);
break;
case VAK_Invalid:
if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
Diag(E->getBeginLoc(),
diag::err_cannot_pass_non_trivial_c_struct_to_vararg)
<< Ty << CT;
else if (Ty->isObjCObjectType())
DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
<< Ty << CT);
else
Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg)
<< isa<InitListExpr>(E) << Ty << CT;
break;
}
}
/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
/// will create a trap if the resulting type is not a POD type.
ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
FunctionDecl *FDecl) {
if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
// Strip the unbridged-cast placeholder expression off, if applicable.
if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
(CT == VariadicMethod ||
(FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
E = stripARCUnbridgedCast(E);
// Otherwise, do normal placeholder checking.
} else {
ExprResult ExprRes = CheckPlaceholderExpr(E);
if (ExprRes.isInvalid())
return ExprError();
E = ExprRes.get();
}
}
ExprResult ExprRes = DefaultArgumentPromotion(E);
if (ExprRes.isInvalid())
return ExprError();
// Copy blocks to the heap.
if (ExprRes.get()->getType()->isBlockPointerType())
maybeExtendBlockObject(ExprRes);
E = ExprRes.get();
// Diagnostics regarding non-POD argument types are
// emitted along with format string checking in Sema::CheckFunctionCall().
if (isValidVarArgType(E->getType()) == VAK_Undefined) {
// Turn this into a trap.
CXXScopeSpec SS;
SourceLocation TemplateKWLoc;
UnqualifiedId Name;
Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
E->getBeginLoc());
ExprResult TrapFn = ActOnIdExpression(TUScope, SS, TemplateKWLoc, Name,
/*HasTrailingLParen=*/true,
/*IsAddressOfOperand=*/false);
if (TrapFn.isInvalid())
return ExprError();
ExprResult Call = BuildCallExpr(TUScope, TrapFn.get(), E->getBeginLoc(),
std::nullopt, E->getEndLoc());
if (Call.isInvalid())
return ExprError();
ExprResult Comma =
ActOnBinOp(TUScope, E->getBeginLoc(), tok::comma, Call.get(), E);
if (Comma.isInvalid())
return ExprError();
return Comma.get();
}
if (!getLangOpts().CPlusPlus &&
RequireCompleteType(E->getExprLoc(), E->getType(),
diag::err_call_incomplete_argument))
return ExprError();
return E;
}
/// Convert complex integers to complex floats and real integers to
/// real floats as required for complex arithmetic. Helper function of
/// UsualArithmeticConversions()
///
/// \return false if the integer expression is an integer type and is
/// successfully converted to the (complex) float type.
static bool handleComplexIntegerToFloatConversion(Sema &S, ExprResult &IntExpr,
ExprResult &ComplexExpr,
QualType IntTy,
QualType ComplexTy,
bool SkipCast) {
if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
if (SkipCast) return false;
if (IntTy->isIntegerType()) {
QualType fpTy = ComplexTy->castAs<ComplexType>()->getElementType();
IntExpr = S.ImpCastExprToType(IntExpr.get(), fpTy, CK_IntegralToFloating);
} else {
assert(IntTy->isComplexIntegerType());
IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
CK_IntegralComplexToFloatingComplex);
}
return false;
}
// This handles complex/complex, complex/float, or float/complex.
// When both operands are complex, the shorter operand is converted to the
// type of the longer, and that is the type of the result. This corresponds
// to what is done when combining two real floating-point operands.
// The fun begins when size promotion occur across type domains.
// From H&S 6.3.4: When one operand is complex and the other is a real
// floating-point type, the less precise type is converted, within it's
// real or complex domain, to the precision of the other type. For example,
// when combining a "long double" with a "double _Complex", the
// "double _Complex" is promoted to "long double _Complex".
static QualType handleComplexFloatConversion(Sema &S, ExprResult &Shorter,
QualType ShorterType,
QualType LongerType,
bool PromotePrecision) {
bool LongerIsComplex = isa<ComplexType>(LongerType.getCanonicalType());
QualType Result =
LongerIsComplex ? LongerType : S.Context.getComplexType(LongerType);
if (PromotePrecision) {
if (isa<ComplexType>(ShorterType.getCanonicalType())) {
Shorter =
S.ImpCastExprToType(Shorter.get(), Result, CK_FloatingComplexCast);
} else {
if (LongerIsComplex)
LongerType = LongerType->castAs<ComplexType>()->getElementType();
Shorter = S.ImpCastExprToType(Shorter.get(), LongerType, CK_FloatingCast);
}
}
return Result;
}
/// Handle arithmetic conversion with complex types. Helper function of
/// UsualArithmeticConversions()
static QualType handleComplexConversion(Sema &S, ExprResult &LHS,
ExprResult &RHS, QualType LHSType,
QualType RHSType, bool IsCompAssign) {
// Handle (complex) integer types.
if (!handleComplexIntegerToFloatConversion(S, RHS, LHS, RHSType, LHSType,
/*SkipCast=*/false))
return LHSType;
if (!handleComplexIntegerToFloatConversion(S, LHS, RHS, LHSType, RHSType,
/*SkipCast=*/IsCompAssign))
return RHSType;
// Compute the rank of the two types, regardless of whether they are complex.
int Order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
if (Order < 0)
// Promote the precision of the LHS if not an assignment.
return handleComplexFloatConversion(S, LHS, LHSType, RHSType,
/*PromotePrecision=*/!IsCompAssign);
// Promote the precision of the RHS unless it is already the same as the LHS.
return handleComplexFloatConversion(S, RHS, RHSType, LHSType,
/*PromotePrecision=*/Order > 0);
}
/// Handle arithmetic conversion from integer to float. Helper function
/// of UsualArithmeticConversions()
static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
ExprResult &IntExpr,
QualType FloatTy, QualType IntTy,
bool ConvertFloat, bool ConvertInt) {
if (IntTy->isIntegerType()) {
if (ConvertInt)
// Convert intExpr to the lhs floating point type.
IntExpr = S.ImpCastExprToType(IntExpr.get(), FloatTy,
CK_IntegralToFloating);
return FloatTy;
}
// Convert both sides to the appropriate complex float.
assert(IntTy->isComplexIntegerType());
QualType result = S.Context.getComplexType(FloatTy);
// _Complex int -> _Complex float
if (ConvertInt)
IntExpr = S.ImpCastExprToType(IntExpr.get(), result,
CK_IntegralComplexToFloatingComplex);
// float -> _Complex float
if (ConvertFloat)
FloatExpr = S.ImpCastExprToType(FloatExpr.get(), result,
CK_FloatingRealToComplex);
return result;
}
/// Handle arithmethic conversion with floating point types. Helper
/// function of UsualArithmeticConversions()
static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
ExprResult &RHS, QualType LHSType,
QualType RHSType, bool IsCompAssign) {
bool LHSFloat = LHSType->isRealFloatingType();
bool RHSFloat = RHSType->isRealFloatingType();
// N1169 4.1.4: If one of the operands has a floating type and the other
// operand has a fixed-point type, the fixed-point operand
// is converted to the floating type [...]
if (LHSType->isFixedPointType() || RHSType->isFixedPointType()) {
if (LHSFloat)
RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FixedPointToFloating);
else if (!IsCompAssign)
LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FixedPointToFloating);
return LHSFloat ? LHSType : RHSType;
}
// If we have two real floating types, convert the smaller operand
// to the bigger result.
if (LHSFloat && RHSFloat) {
int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
if (order > 0) {
RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FloatingCast);
return LHSType;
}
assert(order < 0 && "illegal float comparison");
if (!IsCompAssign)
LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FloatingCast);
return RHSType;
}
if (LHSFloat) {
// Half FP has to be promoted to float unless it is natively supported
if (LHSType->isHalfType() && !S.getLangOpts().NativeHalfType)
LHSType = S.Context.FloatTy;
return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
/*ConvertFloat=*/!IsCompAssign,
/*ConvertInt=*/ true);
}
assert(RHSFloat);
return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
/*ConvertFloat=*/ true,
/*ConvertInt=*/!IsCompAssign);
}
/// Diagnose attempts to convert between __float128, __ibm128 and
/// long double if there is no support for such conversion.
/// Helper function of UsualArithmeticConversions().
static bool unsupportedTypeConversion(const Sema &S, QualType LHSType,
QualType RHSType) {
// No issue if either is not a floating point type.
if (!LHSType->isFloatingType() || !RHSType->isFloatingType())
return false;
// No issue if both have the same 128-bit float semantics.
auto *LHSComplex = LHSType->getAs<ComplexType>();
auto *RHSComplex = RHSType->getAs<ComplexType>();
QualType LHSElem = LHSComplex ? LHSComplex->getElementType() : LHSType;
QualType RHSElem = RHSComplex ? RHSComplex->getElementType() : RHSType;
const llvm::fltSemantics &LHSSem = S.Context.getFloatTypeSemantics(LHSElem);
const llvm::fltSemantics &RHSSem = S.Context.getFloatTypeSemantics(RHSElem);
if ((&LHSSem != &llvm::APFloat::PPCDoubleDouble() ||
&RHSSem != &llvm::APFloat::IEEEquad()) &&
(&LHSSem != &llvm::APFloat::IEEEquad() ||
&RHSSem != &llvm::APFloat::PPCDoubleDouble()))
return false;
return true;
}
typedef ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType);
namespace {
/// These helper callbacks are placed in an anonymous namespace to
/// permit their use as function template parameters.
ExprResult doIntegralCast(Sema &S, Expr *op, QualType toType) {
return S.ImpCastExprToType(op, toType, CK_IntegralCast);
}
ExprResult doComplexIntegralCast(Sema &S, Expr *op, QualType toType) {
return S.ImpCastExprToType(op, S.Context.getComplexType(toType),
CK_IntegralComplexCast);
}
}
/// Handle integer arithmetic conversions. Helper function of
/// UsualArithmeticConversions()
template <PerformCastFn doLHSCast, PerformCastFn doRHSCast>
static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
ExprResult &RHS, QualType LHSType,
QualType RHSType, bool IsCompAssign) {
// The rules for this case are in C99 6.3.1.8
int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
if (LHSSigned == RHSSigned) {
// Same signedness; use the higher-ranked type
if (order >= 0) {
RHS = (*doRHSCast)(S, RHS.get(), LHSType);
return LHSType;
} else if (!IsCompAssign)
LHS = (*doLHSCast)(S, LHS.get(), RHSType);
return RHSType;
} else if (order != (LHSSigned ? 1 : -1)) {
// The unsigned type has greater than or equal rank to the
// signed type, so use the unsigned type
if (RHSSigned) {
RHS = (*doRHSCast)(S, RHS.get(), LHSType);
return LHSType;
} else if (!IsCompAssign)
LHS = (*doLHSCast)(S, LHS.get(), RHSType);
return RHSType;
} else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
// The two types are different widths; if we are here, that
// means the signed type is larger than the unsigned type, so
// use the signed type.
if (LHSSigned) {
RHS = (*doRHSCast)(S, RHS.get(), LHSType);
return LHSType;
} else if (!IsCompAssign)
LHS = (*doLHSCast)(S, LHS.get(), RHSType);
return RHSType;
} else {
// The signed type is higher-ranked than the unsigned type,
// but isn't actually any bigger (like unsigned int and long
// on most 32-bit systems). Use the unsigned type corresponding
// to the signed type.
QualType result =
S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
RHS = (*doRHSCast)(S, RHS.get(), result);
if (!IsCompAssign)
LHS = (*doLHSCast)(S, LHS.get(), result);
return result;
}
}
/// Handle conversions with GCC complex int extension. Helper function
/// of UsualArithmeticConversions()
static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
ExprResult &RHS, QualType LHSType,
QualType RHSType,
bool IsCompAssign) {
const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();
if (LHSComplexInt && RHSComplexInt) {
QualType LHSEltType = LHSComplexInt->getElementType();
QualType RHSEltType = RHSComplexInt->getElementType();
QualType ScalarType =
handleIntegerConversion<doComplexIntegralCast, doComplexIntegralCast>
(S, LHS, RHS, LHSEltType, RHSEltType, IsCompAssign);
return S.Context.getComplexType(ScalarType);
}
if (LHSComplexInt) {
QualType LHSEltType = LHSComplexInt->getElementType();
QualType ScalarType =
handleIntegerConversion<doComplexIntegralCast, doIntegralCast>
(S, LHS, RHS, LHSEltType, RHSType, IsCompAssign);
QualType ComplexType = S.Context.getComplexType(ScalarType);
RHS = S.ImpCastExprToType(RHS.get(), ComplexType,
CK_IntegralRealToComplex);
return ComplexType;
}
assert(RHSComplexInt);
QualType RHSEltType = RHSComplexInt->getElementType();
QualType ScalarType =
handleIntegerConversion<doIntegralCast, doComplexIntegralCast>
(S, LHS, RHS, LHSType, RHSEltType, IsCompAssign);
QualType ComplexType = S.Context.getComplexType(ScalarType);
if (!IsCompAssign)
LHS = S.ImpCastExprToType(LHS.get(), ComplexType,
CK_IntegralRealToComplex);
return ComplexType;
}
/// Return the rank of a given fixed point or integer type. The value itself
/// doesn't matter, but the values must be increasing with proper increasing
/// rank as described in N1169 4.1.1.
static unsigned GetFixedPointRank(QualType Ty) {
const auto *BTy = Ty->getAs<BuiltinType>();
assert(BTy && "Expected a builtin type.");
switch (BTy->getKind()) {
case BuiltinType::ShortFract:
case BuiltinType::UShortFract:
case BuiltinType::SatShortFract:
case BuiltinType::SatUShortFract:
return 1;
case BuiltinType::Fract:
case BuiltinType::UFract:
case BuiltinType::SatFract:
case BuiltinType::SatUFract:
return 2;
case BuiltinType::LongFract:
case BuiltinType::ULongFract:
case BuiltinType::SatLongFract:
case BuiltinType::SatULongFract:
return 3;
case BuiltinType::ShortAccum:
case BuiltinType::UShortAccum:
case BuiltinType::SatShortAccum:
case BuiltinType::SatUShortAccum:
return 4;
case BuiltinType::Accum:
case BuiltinType::UAccum:
case BuiltinType::SatAccum:
case BuiltinType::SatUAccum:
return 5;
case BuiltinType::LongAccum:
case BuiltinType::ULongAccum:
case BuiltinType::SatLongAccum:
case BuiltinType::SatULongAccum:
return 6;
default:
if (BTy->isInteger())
return 0;
llvm_unreachable("Unexpected fixed point or integer type");
}
}
/// handleFixedPointConversion - Fixed point operations between fixed
/// point types and integers or other fixed point types do not fall under
/// usual arithmetic conversion since these conversions could result in loss
/// of precsision (N1169 4.1.4). These operations should be calculated with
/// the full precision of their result type (N1169 4.1.6.2.1).
static QualType handleFixedPointConversion(Sema &S, QualType LHSTy,
QualType RHSTy) {
assert((LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) &&
"Expected at least one of the operands to be a fixed point type");
assert((LHSTy->isFixedPointOrIntegerType() ||
RHSTy->isFixedPointOrIntegerType()) &&
"Special fixed point arithmetic operation conversions are only "
"applied to ints or other fixed point types");
// If one operand has signed fixed-point type and the other operand has
// unsigned fixed-point type, then the unsigned fixed-point operand is
// converted to its corresponding signed fixed-point type and the resulting
// type is the type of the converted operand.
if (RHSTy->isSignedFixedPointType() && LHSTy->isUnsignedFixedPointType())
LHSTy = S.Context.getCorrespondingSignedFixedPointType(LHSTy);
else if (RHSTy->isUnsignedFixedPointType() && LHSTy->isSignedFixedPointType())
RHSTy = S.Context.getCorrespondingSignedFixedPointType(RHSTy);
// The result type is the type with the highest rank, whereby a fixed-point
// conversion rank is always greater than an integer conversion rank; if the
// type of either of the operands is a saturating fixedpoint type, the result
// type shall be the saturating fixed-point type corresponding to the type
// with the highest rank; the resulting value is converted (taking into
// account rounding and overflow) to the precision of the resulting type.
// Same ranks between signed and unsigned types are resolved earlier, so both
// types are either signed or both unsigned at this point.
unsigned LHSTyRank = GetFixedPointRank(LHSTy);
unsigned RHSTyRank = GetFixedPointRank(RHSTy);
QualType ResultTy = LHSTyRank > RHSTyRank ? LHSTy : RHSTy;
if (LHSTy->isSaturatedFixedPointType() || RHSTy->isSaturatedFixedPointType())
ResultTy = S.Context.getCorrespondingSaturatedType(ResultTy);
return ResultTy;
}
/// Check that the usual arithmetic conversions can be performed on this pair of
/// expressions that might be of enumeration type.
static void checkEnumArithmeticConversions(Sema &S, Expr *LHS, Expr *RHS,
SourceLocation Loc,
Sema::ArithConvKind ACK) {
// C++2a [expr.arith.conv]p1:
// If one operand is of enumeration type and the other operand is of a
// different enumeration type or a floating-point type, this behavior is
// deprecated ([depr.arith.conv.enum]).
//
// Warn on this in all language modes. Produce a deprecation warning in C++20.
// Eventually we will presumably reject these cases (in C++23 onwards?).
QualType L = LHS->getEnumCoercedType(S.Context),
R = RHS->getEnumCoercedType(S.Context);
bool LEnum = L->isUnscopedEnumerationType(),
REnum = R->isUnscopedEnumerationType();
bool IsCompAssign = ACK == Sema::ACK_CompAssign;
if ((!IsCompAssign && LEnum && R->isFloatingType()) ||
(REnum && L->isFloatingType())) {
S.Diag(Loc, S.getLangOpts().CPlusPlus26
? diag::err_arith_conv_enum_float_cxx26
: S.getLangOpts().CPlusPlus20
? diag::warn_arith_conv_enum_float_cxx20
: diag::warn_arith_conv_enum_float)
<< LHS->getSourceRange() << RHS->getSourceRange() << (int)ACK << LEnum
<< L << R;
} else if (!IsCompAssign && LEnum && REnum &&
!S.Context.hasSameUnqualifiedType(L, R)) {
unsigned DiagID;
// In C++ 26, usual arithmetic conversions between 2 different enum types
// are ill-formed.
if (S.getLangOpts().CPlusPlus26)
DiagID = diag::err_conv_mixed_enum_types_cxx26;
else if (!L->castAs<EnumType>()->getDecl()->hasNameForLinkage() ||
!R->castAs<EnumType>()->getDecl()->hasNameForLinkage()) {
// If either enumeration type is unnamed, it's less likely that the
// user cares about this, but this situation is still deprecated in
// C++2a. Use a different warning group.
DiagID = S.getLangOpts().CPlusPlus20
? diag::warn_arith_conv_mixed_anon_enum_types_cxx20
: diag::warn_arith_conv_mixed_anon_enum_types;
} else if (ACK == Sema::ACK_Conditional) {
// Conditional expressions are separated out because they have
// historically had a different warning flag.
DiagID = S.getLangOpts().CPlusPlus20
? diag::warn_conditional_mixed_enum_types_cxx20
: diag::warn_conditional_mixed_enum_types;
} else if (ACK == Sema::ACK_Comparison) {
// Comparison expressions are separated out because they have
// historically had a different warning flag.
DiagID = S.getLangOpts().CPlusPlus20
? diag::warn_comparison_mixed_enum_types_cxx20
: diag::warn_comparison_mixed_enum_types;
} else {
DiagID = S.getLangOpts().CPlusPlus20
? diag::warn_arith_conv_mixed_enum_types_cxx20
: diag::warn_arith_conv_mixed_enum_types;
}
S.Diag(Loc, DiagID) << LHS->getSourceRange() << RHS->getSourceRange()
<< (int)ACK << L << R;
}
}
/// UsualArithmeticConversions - Performs various conversions that are common to
/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
/// routine returns the first non-arithmetic type found. The client is
/// responsible for emitting appropriate error diagnostics.
QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
ArithConvKind ACK) {
checkEnumArithmeticConversions(*this, LHS.get(), RHS.get(), Loc, ACK);
if (ACK != ACK_CompAssign) {
LHS = UsualUnaryConversions(LHS.get());
if (LHS.isInvalid())
return QualType();
}
RHS = UsualUnaryConversions(RHS.get());
if (RHS.isInvalid())
return QualType();
// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType = LHS.get()->getType().getUnqualifiedType();
QualType RHSType = RHS.get()->getType().getUnqualifiedType();
// For conversion purposes, we ignore any atomic qualifier on the LHS.
if (const AtomicType *AtomicLHS = LHSType->getAs<AtomicType>())
LHSType = AtomicLHS->getValueType();
// If both types are identical, no conversion is needed.
if (Context.hasSameType(LHSType, RHSType))
return Context.getCommonSugaredType(LHSType, RHSType);
// If either side is a non-arithmetic type (e.g. a pointer), we are done.
// The caller can deal with this (e.g. pointer + int).
if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
return QualType();
// Apply unary and bitfield promotions to the LHS's type.
QualType LHSUnpromotedType = LHSType;
if (Context.isPromotableIntegerType(LHSType))
LHSType = Context.getPromotedIntegerType(LHSType);
QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
if (!LHSBitfieldPromoteTy.isNull())
LHSType = LHSBitfieldPromoteTy;
if (LHSType != LHSUnpromotedType && ACK != ACK_CompAssign)
LHS = ImpCastExprToType(LHS.get(), LHSType, CK_IntegralCast);
// If both types are identical, no conversion is needed.
if (Context.hasSameType(LHSType, RHSType))
return Context.getCommonSugaredType(LHSType, RHSType);
// At this point, we have two different arithmetic types.
// Diagnose attempts to convert between __ibm128, __float128 and long double
// where such conversions currently can't be handled.
if (unsupportedTypeConversion(*this, LHSType, RHSType))
return QualType();
// Handle complex types first (C99 6.3.1.8p1).
if (LHSType->isComplexType() || RHSType->isComplexType())
return handleComplexConversion(*this, LHS, RHS, LHSType, RHSType,
ACK == ACK_CompAssign);
// Now handle "real" floating types (i.e. float, double, long double).
if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
ACK == ACK_CompAssign);
// Handle GCC complex int extension.
if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
ACK == ACK_CompAssign);
if (LHSType->isFixedPointType() || RHSType->isFixedPointType())
return handleFixedPointConversion(*this, LHSType, RHSType);
// Finally, we have two differing integer types.
return handleIntegerConversion<doIntegralCast, doIntegralCast>
(*this, LHS, RHS, LHSType, RHSType, ACK == ACK_CompAssign);
}
//===----------------------------------------------------------------------===//
// Semantic Analysis for various Expression Types
//===----------------------------------------------------------------------===//
ExprResult Sema::ActOnGenericSelectionExpr(
SourceLocation KeyLoc, SourceLocation DefaultLoc, SourceLocation RParenLoc,
bool PredicateIsExpr, void *ControllingExprOrType,
ArrayRef<ParsedType> ArgTypes, ArrayRef<Expr *> ArgExprs) {
unsigned NumAssocs = ArgTypes.size();
assert(NumAssocs == ArgExprs.size());
TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
for (unsigned i = 0; i < NumAssocs; ++i) {
if (ArgTypes[i])
(void) GetTypeFromParser(ArgTypes[i], &Types[i]);
else
Types[i] = nullptr;
}
// If we have a controlling type, we need to convert it from a parsed type
// into a semantic type and then pass that along.
if (!PredicateIsExpr) {
TypeSourceInfo *ControllingType;
(void)GetTypeFromParser(ParsedType::getFromOpaquePtr(ControllingExprOrType),
&ControllingType);
assert(ControllingType && "couldn't get the type out of the parser");
ControllingExprOrType = ControllingType;
}
ExprResult ER = CreateGenericSelectionExpr(
KeyLoc, DefaultLoc, RParenLoc, PredicateIsExpr, ControllingExprOrType,
llvm::ArrayRef(Types, NumAssocs), ArgExprs);
delete [] Types;
return ER;
}
ExprResult Sema::CreateGenericSelectionExpr(
SourceLocation KeyLoc, SourceLocation DefaultLoc, SourceLocation RParenLoc,
bool PredicateIsExpr, void *ControllingExprOrType,
ArrayRef<TypeSourceInfo *> Types, ArrayRef<Expr *> Exprs) {
unsigned NumAssocs = Types.size();
assert(NumAssocs == Exprs.size());
assert(ControllingExprOrType &&
"Must have either a controlling expression or a controlling type");
Expr *ControllingExpr = nullptr;
TypeSourceInfo *ControllingType = nullptr;
if (PredicateIsExpr) {
// Decay and strip qualifiers for the controlling expression type, and
// handle placeholder type replacement. See committee discussion from WG14
// DR423.
EnterExpressionEvaluationContext Unevaluated(
*this, Sema::ExpressionEvaluationContext::Unevaluated);
ExprResult R = DefaultFunctionArrayLvalueConversion(
reinterpret_cast<Expr *>(ControllingExprOrType));
if (R.isInvalid())
return ExprError();
ControllingExpr = R.get();
} else {
// The extension form uses the type directly rather than converting it.
ControllingType = reinterpret_cast<TypeSourceInfo *>(ControllingExprOrType);
if (!ControllingType)
return ExprError();
}
bool TypeErrorFound = false,
IsResultDependent = ControllingExpr
? ControllingExpr->isTypeDependent()
: ControllingType->getType()->isDependentType(),
ContainsUnexpandedParameterPack =
ControllingExpr
? ControllingExpr->containsUnexpandedParameterPack()
: ControllingType->getType()->containsUnexpandedParameterPack();
// The controlling expression is an unevaluated operand, so side effects are
// likely unintended.
if (!inTemplateInstantiation() && !IsResultDependent && ControllingExpr &&
ControllingExpr->HasSideEffects(Context, false))
Diag(ControllingExpr->getExprLoc(),
diag::warn_side_effects_unevaluated_context);
for (unsigned i = 0; i < NumAssocs; ++i) {
if (Exprs[i]->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
if (Types[i]) {
if (Types[i]->getType()->containsUnexpandedParameterPack())
ContainsUnexpandedParameterPack = true;
if (Types[i]->getType()->isDependentType()) {
IsResultDependent = true;
} else {
// We relax the restriction on use of incomplete types and non-object
// types with the type-based extension of _Generic. Allowing incomplete
// objects means those can be used as "tags" for a type-safe way to map
// to a value. Similarly, matching on function types rather than
// function pointer types can be useful. However, the restriction on VM
// types makes sense to retain as there are open questions about how
// the selection can be made at compile time.
//
// C11 6.5.1.1p2 "The type name in a generic association shall specify a
// complete object type other than a variably modified type."
unsigned D = 0;
if (ControllingExpr && Types[i]->getType()->isIncompleteType())
D = diag::err_assoc_type_incomplete;
else if (ControllingExpr && !Types[i]->getType()->isObjectType())
D = diag::err_assoc_type_nonobject;
else if (Types[i]->getType()->isVariablyModifiedType())
D = diag::err_assoc_type_variably_modified;
else if (ControllingExpr) {
// Because the controlling expression undergoes lvalue conversion,
// array conversion, and function conversion, an association which is
// of array type, function type, or is qualified can never be
// reached. We will warn about this so users are less surprised by
// the unreachable association. However, we don't have to handle
// function types; that's not an object type, so it's handled above.
//
// The logic is somewhat different for C++ because C++ has different
// lvalue to rvalue conversion rules than C. [conv.lvalue]p1 says,
// If T is a non-class type, the type of the prvalue is the cv-
// unqualified version of T. Otherwise, the type of the prvalue is T.
// The result of these rules is that all qualified types in an
// association in C are unreachable, and in C++, only qualified non-
// class types are unreachable.
//
// NB: this does not apply when the first operand is a type rather
// than an expression, because the type form does not undergo
// conversion.
unsigned Reason = 0;
QualType QT = Types[i]->getType();
if (QT->isArrayType())
Reason = 1;
else if (QT.hasQualifiers() &&
(!LangOpts.CPlusPlus || !QT->isRecordType()))
Reason = 2;
if (Reason)
Diag(Types[i]->getTypeLoc().getBeginLoc(),
diag::warn_unreachable_association)
<< QT << (Reason - 1);
}
if (D != 0) {
Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
<< Types[i]->getTypeLoc().getSourceRange()
<< Types[i]->getType();
TypeErrorFound = true;
}
// C11 6.5.1.1p2 "No two generic associations in the same generic
// selection shall specify compatible types."
for (unsigned j = i+1; j < NumAssocs; ++j)
if (Types[j] && !Types[j]->getType()->isDependentType() &&
Context.typesAreCompatible(Types[i]->getType(),
Types[j]->getType())) {
Diag(Types[j]->getTypeLoc().getBeginLoc(),
diag::err_assoc_compatible_types)
<< Types[j]->getTypeLoc().getSourceRange()
<< Types[j]->getType()
<< Types[i]->getType();
Diag(Types[i]->getTypeLoc().getBeginLoc(),
diag::note_compat_assoc)
<< Types[i]->getTypeLoc().getSourceRange()
<< Types[i]->getType();
TypeErrorFound = true;
}
}
}
}
if (TypeErrorFound)
return ExprError();
// If we determined that the generic selection is result-dependent, don't
// try to compute the result expression.
if (IsResultDependent) {
if (ControllingExpr)
return GenericSelectionExpr::Create(Context, KeyLoc, ControllingExpr,
Types, Exprs, DefaultLoc, RParenLoc,
ContainsUnexpandedParameterPack);
return GenericSelectionExpr::Create(Context, KeyLoc, ControllingType, Types,
Exprs, DefaultLoc, RParenLoc,
ContainsUnexpandedParameterPack);
}
SmallVector<unsigned, 1> CompatIndices;
unsigned DefaultIndex = -1U;
// Look at the canonical type of the controlling expression in case it was a
// deduced type like __auto_type. However, when issuing diagnostics, use the
// type the user wrote in source rather than the canonical one.
for (unsigned i = 0; i < NumAssocs; ++i) {
if (!Types[i])
DefaultIndex = i;
else if (ControllingExpr &&
Context.typesAreCompatible(
ControllingExpr->getType().getCanonicalType(),
Types[i]->getType()))
CompatIndices.push_back(i);
else if (ControllingType &&
Context.typesAreCompatible(
ControllingType->getType().getCanonicalType(),
Types[i]->getType()))
CompatIndices.push_back(i);
}
auto GetControllingRangeAndType = [](Expr *ControllingExpr,
TypeSourceInfo *ControllingType) {
// We strip parens here because the controlling expression is typically
// parenthesized in macro definitions.
if (ControllingExpr)
ControllingExpr = ControllingExpr->IgnoreParens();
SourceRange SR = ControllingExpr
? ControllingExpr->getSourceRange()
: ControllingType->getTypeLoc().getSourceRange();
QualType QT = ControllingExpr ? ControllingExpr->getType()
: ControllingType->getType();
return std::make_pair(SR, QT);
};
// C11 6.5.1.1p2 "The controlling expression of a generic selection shall have
// type compatible with at most one of the types named in its generic
// association list."
if (CompatIndices.size() > 1) {
auto P = GetControllingRangeAndType(ControllingExpr, ControllingType);
SourceRange SR = P.first;
Diag(SR.getBegin(), diag::err_generic_sel_multi_match)
<< SR << P.second << (unsigned)CompatIndices.size();
for (unsigned I : CompatIndices) {
Diag(Types[I]->getTypeLoc().getBeginLoc(),
diag::note_compat_assoc)
<< Types[I]->getTypeLoc().getSourceRange()
<< Types[I]->getType();
}
return ExprError();
}
// C11 6.5.1.1p2 "If a generic selection has no default generic association,
// its controlling expression shall have type compatible with exactly one of
// the types named in its generic association list."
if (DefaultIndex == -1U && CompatIndices.size() == 0) {
auto P = GetControllingRangeAndType(ControllingExpr, ControllingType);
SourceRange SR = P.first;
Diag(SR.getBegin(), diag::err_generic_sel_no_match) << SR << P.second;
return ExprError();
}
// C11 6.5.1.1p3 "If a generic selection has a generic association with a
// type name that is compatible with the type of the controlling expression,
// then the result expression of the generic selection is the expression
// in that generic association. Otherwise, the result expression of the
// generic selection is the expression in the default generic association."
unsigned ResultIndex =
CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
if (ControllingExpr) {
return GenericSelectionExpr::Create(
Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc,
ContainsUnexpandedParameterPack, ResultIndex);
}
return GenericSelectionExpr::Create(
Context, KeyLoc, ControllingType, Types, Exprs, DefaultLoc, RParenLoc,
ContainsUnexpandedParameterPack, ResultIndex);
}
static PredefinedIdentKind getPredefinedExprKind(tok::TokenKind Kind) {
switch (Kind) {
default:
llvm_unreachable("unexpected TokenKind");
case tok::kw___func__:
return PredefinedIdentKind::Func; // [C99 6.4.2.2]
case tok::kw___FUNCTION__:
return PredefinedIdentKind::Function;
case tok::kw___FUNCDNAME__:
return PredefinedIdentKind::FuncDName; // [MS]
case tok::kw___FUNCSIG__:
return PredefinedIdentKind::FuncSig; // [MS]
case tok::kw_L__FUNCTION__:
return PredefinedIdentKind::LFunction; // [MS]
case tok::kw_L__FUNCSIG__:
return PredefinedIdentKind::LFuncSig; // [MS]
case tok::kw___PRETTY_FUNCTION__:
return PredefinedIdentKind::PrettyFunction; // [GNU]
}
}
/// getPredefinedExprDecl - Returns Decl of a given DeclContext that can be used
/// to determine the value of a PredefinedExpr. This can be either a
/// block, lambda, captured statement, function, otherwise a nullptr.
static Decl *getPredefinedExprDecl(DeclContext *DC) {
while (DC && !isa<BlockDecl, CapturedDecl, FunctionDecl, ObjCMethodDecl>(DC))
DC = DC->getParent();
return cast_or_null<Decl>(DC);
}
/// getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the
/// location of the token and the offset of the ud-suffix within it.
static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc,
unsigned Offset) {
return Lexer::AdvanceToTokenCharacter(TokLoc, Offset, S.getSourceManager(),
S.getLangOpts());
}
/// BuildCookedLiteralOperatorCall - A user-defined literal was found. Look up
/// the corresponding cooked (non-raw) literal operator, and build a call to it.
static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope,
IdentifierInfo *UDSuffix,
SourceLocation UDSuffixLoc,
ArrayRef<Expr*> Args,
SourceLocation LitEndLoc) {
assert(Args.size() <= 2 && "too many arguments for literal operator");
QualType ArgTy[2];
for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) {
ArgTy[ArgIdx] = Args[ArgIdx]->getType();
if (ArgTy[ArgIdx]->isArrayType())
ArgTy[ArgIdx] = S.Context.getArrayDecayedType(ArgTy[ArgIdx]);
}
DeclarationName OpName =
S.Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
LookupResult R(S, OpName, UDSuffixLoc, Sema::LookupOrdinaryName);
if (S.LookupLiteralOperator(Scope, R, llvm::ArrayRef(ArgTy, Args.size()),
/*AllowRaw*/ false, /*AllowTemplate*/ false,
/*AllowStringTemplatePack*/ false,
/*DiagnoseMissing*/ true) == Sema::LOLR_Error)
return ExprError();
return S.BuildLiteralOperatorCall(R, OpNameInfo, Args, LitEndLoc);
}
ExprResult Sema::ActOnUnevaluatedStringLiteral(ArrayRef<Token> StringToks) {
// StringToks needs backing storage as it doesn't hold array elements itself
std::vector<Token> ExpandedToks;
if (getLangOpts().MicrosoftExt)
StringToks = ExpandedToks = ExpandFunctionLocalPredefinedMacros(StringToks);
StringLiteralParser Literal(StringToks, PP,
StringLiteralEvalMethod::Unevaluated);
if (Literal.hadError)
return ExprError();
SmallVector<SourceLocation, 4> StringTokLocs;
for (const Token &Tok : StringToks)
StringTokLocs.push_back(Tok.getLocation());
StringLiteral *Lit = StringLiteral::Create(
Context, Literal.GetString(), StringLiteralKind::Unevaluated, false, {},
&StringTokLocs[0], StringTokLocs.size());
if (!Literal.getUDSuffix().empty()) {
SourceLocation UDSuffixLoc =
getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()],
Literal.getUDSuffixOffset());
return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl));
}
return Lit;
}
std::vector<Token>
Sema::ExpandFunctionLocalPredefinedMacros(ArrayRef<Token> Toks) {
// MSVC treats some predefined identifiers (e.g. __FUNCTION__) as function
// local macros that expand to string literals that may be concatenated.
// These macros are expanded here (in Sema), because StringLiteralParser
// (in Lex) doesn't know the enclosing function (because it hasn't been
// parsed yet).
assert(getLangOpts().MicrosoftExt);
// Note: Although function local macros are defined only inside functions,
// we ensure a valid `CurrentDecl` even outside of a function. This allows
// expansion of macros into empty string literals without additional checks.
Decl *CurrentDecl = getPredefinedExprDecl(CurContext);
if (!CurrentDecl)
CurrentDecl = Context.getTranslationUnitDecl();
std::vector<Token> ExpandedToks;
ExpandedToks.reserve(Toks.size());
for (const Token &Tok : Toks) {
if (!isFunctionLocalStringLiteralMacro(Tok.getKind(), getLangOpts())) {
assert(tok::isStringLiteral(Tok.getKind()));
ExpandedToks.emplace_back(Tok);
continue;
}
if (isa<TranslationUnitDecl>(CurrentDecl))
Diag(Tok.getLocation(), diag::ext_predef_outside_function);
// Stringify predefined expression
Diag(Tok.getLocation(), diag::ext_string_literal_from_predefined)
<< Tok.getKind();
SmallString<64> Str;
llvm::raw_svector_ostream OS(Str);
Token &Exp = ExpandedToks.emplace_back();
Exp.startToken();
if (Tok.getKind() == tok::kw_L__FUNCTION__ ||
Tok.getKind() == tok::kw_L__FUNCSIG__) {
OS << 'L';
Exp.setKind(tok::wide_string_literal);
} else {
Exp.setKind(tok::string_literal);
}
OS << '"'
<< Lexer::Stringify(PredefinedExpr::ComputeName(
getPredefinedExprKind(Tok.getKind()), CurrentDecl))
<< '"';
PP.CreateString(OS.str(), Exp, Tok.getLocation(), Tok.getEndLoc());
}
return ExpandedToks;
}
/// ActOnStringLiteral - The specified tokens were lexed as pasted string
/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
/// multiple tokens. However, the common case is that StringToks points to one
/// string.
///
ExprResult
Sema::ActOnStringLiteral(ArrayRef<Token> StringToks, Scope *UDLScope) {
assert(!StringToks.empty() && "Must have at least one string!");
// StringToks needs backing storage as it doesn't hold array elements itself
std::vector<Token> ExpandedToks;
if (getLangOpts().MicrosoftExt)
StringToks = ExpandedToks = ExpandFunctionLocalPredefinedMacros(StringToks);
StringLiteralParser Literal(StringToks, PP);
if (Literal.hadError)
return ExprError();
SmallVector<SourceLocation, 4> StringTokLocs;
for (const Token &Tok : StringToks)
StringTokLocs.push_back(Tok.getLocation());
QualType CharTy = Context.CharTy;
StringLiteralKind Kind = StringLiteralKind::Ordinary;
if (Literal.isWide()) {
CharTy = Context.getWideCharType();
Kind = StringLiteralKind::Wide;
} else if (Literal.isUTF8()) {
if (getLangOpts().Char8)
CharTy = Context.Char8Ty;
Kind = StringLiteralKind::UTF8;
} else if (Literal.isUTF16()) {
CharTy = Context.Char16Ty;
Kind = StringLiteralKind::UTF16;
} else if (Literal.isUTF32()) {
CharTy = Context.Char32Ty;
Kind = StringLiteralKind::UTF32;
} else if (Literal.isPascal()) {
CharTy = Context.UnsignedCharTy;
}
// Warn on initializing an array of char from a u8 string literal; this
// becomes ill-formed in C++2a.
if (getLangOpts().CPlusPlus && !getLangOpts().CPlusPlus20 &&
!getLangOpts().Char8 && Kind == StringLiteralKind::UTF8) {
Diag(StringTokLocs.front(), diag::warn_cxx20_compat_utf8_string);
// Create removals for all 'u8' prefixes in the string literal(s). This
// ensures C++2a compatibility (but may change the program behavior when
// built by non-Clang compilers for which the execution character set is
// not always UTF-8).
auto RemovalDiag = PDiag(diag::note_cxx20_compat_utf8_string_remove_u8);
SourceLocation RemovalDiagLoc;
for (const Token &Tok : StringToks) {
if (Tok.getKind() == tok::utf8_string_literal) {
if (RemovalDiagLoc.isInvalid())
RemovalDiagLoc = Tok.getLocation();
RemovalDiag << FixItHint::CreateRemoval(CharSourceRange::getCharRange(
Tok.getLocation(),
Lexer::AdvanceToTokenCharacter(Tok.getLocation(), 2,
getSourceManager(), getLangOpts())));
}
}
Diag(RemovalDiagLoc, RemovalDiag);
}
QualType StrTy =
Context.getStringLiteralArrayType(CharTy, Literal.GetNumStringChars());
// Pass &StringTokLocs[0], StringTokLocs.size() to factory!
StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
Kind, Literal.Pascal, StrTy,
&StringTokLocs[0],
StringTokLocs.size());
if (Literal.getUDSuffix().empty())
return Lit;
// We're building a user-defined literal.
IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
SourceLocation UDSuffixLoc =
getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()],
Literal.getUDSuffixOffset());
// Make sure we're allowed user-defined literals here.
if (!UDLScope)
return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl));
// C++11 [lex.ext]p5: The literal L is treated as a call of the form
// operator "" X (str, len)
QualType SizeType = Context.getSizeType();
DeclarationName OpName =
Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
QualType ArgTy[] = {
Context.getArrayDecayedType(StrTy), SizeType
};
LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
switch (LookupLiteralOperator(UDLScope, R, ArgTy,
/*AllowRaw*/ false, /*AllowTemplate*/ true,
/*AllowStringTemplatePack*/ true,
/*DiagnoseMissing*/ true, Lit)) {
case LOLR_Cooked: {
llvm::APInt Len(Context.getIntWidth(SizeType), Literal.GetNumStringChars());
IntegerLiteral *LenArg = IntegerLiteral::Create(Context, Len, SizeType,
StringTokLocs[0]);
Expr *Args[] = { Lit, LenArg };
return BuildLiteralOperatorCall(R, OpNameInfo, Args, StringTokLocs.back());
}
case LOLR_Template: {
TemplateArgumentListInfo ExplicitArgs;
TemplateArgument Arg(Lit);
TemplateArgumentLocInfo ArgInfo(Lit);
ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
return BuildLiteralOperatorCall(R, OpNameInfo, std::nullopt,
StringTokLocs.back(), &ExplicitArgs);
}
case LOLR_StringTemplatePack: {
TemplateArgumentListInfo ExplicitArgs;
unsigned CharBits = Context.getIntWidth(CharTy);
bool CharIsUnsigned = CharTy->isUnsignedIntegerType();
llvm::APSInt Value(CharBits, CharIsUnsigned);
TemplateArgument TypeArg(CharTy);
TemplateArgumentLocInfo TypeArgInfo(Context.getTrivialTypeSourceInfo(CharTy));
ExplicitArgs.addArgument(TemplateArgumentLoc(TypeArg, TypeArgInfo));
for (unsigned I = 0, N = Lit->getLength(); I != N; ++I) {
Value = Lit->getCodeUnit(I);
TemplateArgument Arg(Context, Value, CharTy);
TemplateArgumentLocInfo ArgInfo;
ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
}
return BuildLiteralOperatorCall(R, OpNameInfo, std::nullopt,
StringTokLocs.back(), &ExplicitArgs);
}
case LOLR_Raw:
case LOLR_ErrorNoDiagnostic:
llvm_unreachable("unexpected literal operator lookup result");
case LOLR_Error:
return ExprError();
}
llvm_unreachable("unexpected literal operator lookup result");
}
DeclRefExpr *
Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
SourceLocation Loc,
const CXXScopeSpec *SS) {
DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
}
DeclRefExpr *
Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
const DeclarationNameInfo &NameInfo,
const CXXScopeSpec *SS, NamedDecl *FoundD,
SourceLocation TemplateKWLoc,
const TemplateArgumentListInfo *TemplateArgs) {
NestedNameSpecifierLoc NNS =
SS ? SS->getWithLocInContext(Context) : NestedNameSpecifierLoc();
return BuildDeclRefExpr(D, Ty, VK, NameInfo, NNS, FoundD, TemplateKWLoc,
TemplateArgs);
}
// CUDA/HIP: Check whether a captured reference variable is referencing a
// host variable in a device or host device lambda.
static bool isCapturingReferenceToHostVarInCUDADeviceLambda(const Sema &S,
VarDecl *VD) {
if (!S.getLangOpts().CUDA || !VD->hasInit())
return false;
assert(VD->getType()->isReferenceType());
// Check whether the reference variable is referencing a host variable.
auto *DRE = dyn_cast<DeclRefExpr>(VD->getInit());
if (!DRE)
return false;
auto *Referee = dyn_cast<VarDecl>(DRE->getDecl());
if (!Referee || !Referee->hasGlobalStorage() ||
Referee->hasAttr<CUDADeviceAttr>())
return false;
// Check whether the current function is a device or host device lambda.
// Check whether the reference variable is a capture by getDeclContext()
// since refersToEnclosingVariableOrCapture() is not ready at this point.
auto *MD = dyn_cast_or_null<CXXMethodDecl>(S.CurContext);
if (MD && MD->getParent()->isLambda() &&
MD->getOverloadedOperator() == OO_Call && MD->hasAttr<CUDADeviceAttr>() &&
VD->getDeclContext() != MD)
return true;
return false;
}
NonOdrUseReason Sema::getNonOdrUseReasonInCurrentContext(ValueDecl *D) {
// A declaration named in an unevaluated operand never constitutes an odr-use.
if (isUnevaluatedContext())
return NOUR_Unevaluated;
// C++2a [basic.def.odr]p4:
// A variable x whose name appears as a potentially-evaluated expression e
// is odr-used by e unless [...] x is a reference that is usable in
// constant expressions.
// CUDA/HIP:
// If a reference variable referencing a host variable is captured in a
// device or host device lambda, the value of the referee must be copied
// to the capture and the reference variable must be treated as odr-use
// since the value of the referee is not known at compile time and must
// be loaded from the captured.
if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
if (VD->getType()->isReferenceType() &&
!(getLangOpts().OpenMP && isOpenMPCapturedDecl(D)) &&
!isCapturingReferenceToHostVarInCUDADeviceLambda(*this, VD) &&
VD->isUsableInConstantExpressions(Context))
return NOUR_Constant;
}
// All remaining non-variable cases constitute an odr-use. For variables, we
// need to wait and see how the expression is used.
return NOUR_None;
}
/// BuildDeclRefExpr - Build an expression that references a
/// declaration that does not require a closure capture.
DeclRefExpr *
Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
const DeclarationNameInfo &NameInfo,
NestedNameSpecifierLoc NNS, NamedDecl *FoundD,
SourceLocation TemplateKWLoc,
const TemplateArgumentListInfo *TemplateArgs) {
bool RefersToCapturedVariable = isa<VarDecl, BindingDecl>(D) &&
NeedToCaptureVariable(D, NameInfo.getLoc());
DeclRefExpr *E = DeclRefExpr::Create(
Context, NNS, TemplateKWLoc, D, RefersToCapturedVariable, NameInfo, Ty,
VK, FoundD, TemplateArgs, getNonOdrUseReasonInCurrentContext(D));
MarkDeclRefReferenced(E);
// C++ [except.spec]p17:
// An exception-specification is considered to be needed when:
// - in an expression, the function is the unique lookup result or
// the selected member of a set of overloaded functions.
//
// We delay doing this until after we've built the function reference and
// marked it as used so that:
// a) if the function is defaulted, we get errors from defining it before /
// instead of errors from computing its exception specification, and
// b) if the function is a defaulted comparison, we can use the body we
// build when defining it as input to the exception specification
// computation rather than computing a new body.
if (const auto *FPT = Ty->getAs<FunctionProtoType>()) {
if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) {
if (const auto *NewFPT = ResolveExceptionSpec(NameInfo.getLoc(), FPT))
E->setType(Context.getQualifiedType(NewFPT, Ty.getQualifiers()));
}
}
if (getLangOpts().ObjCWeak && isa<VarDecl>(D) &&
Ty.getObjCLifetime() == Qualifiers::OCL_Weak && !isUnevaluatedContext() &&
!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, E->getBeginLoc()))
getCurFunction()->recordUseOfWeak(E);
const auto *FD = dyn_cast<FieldDecl>(D);
if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D))
FD = IFD->getAnonField();
if (FD) {
UnusedPrivateFields.remove(FD);
// Just in case we're building an illegal pointer-to-member.
if (FD->isBitField())
E->setObjectKind(OK_BitField);
}
// C++ [expr.prim]/8: The expression [...] is a bit-field if the identifier
// designates a bit-field.
if (const auto *BD = dyn_cast<BindingDecl>(D))
if (const auto *BE = BD->getBinding())
E->setObjectKind(BE->getObjectKind());
return E;
}
/// Decomposes the given name into a DeclarationNameInfo, its location, and
/// possibly a list of template arguments.
///
/// If this produces template arguments, it is permitted to call
/// DecomposeTemplateName.
///
/// This actually loses a lot of source location information for
/// non-standard name kinds; we should consider preserving that in
/// some way.
void
Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
TemplateArgumentListInfo &Buffer,
DeclarationNameInfo &NameInfo,
const TemplateArgumentListInfo *&TemplateArgs) {
if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId) {
Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
ASTTemplateArgsPtr TemplateArgsPtr(Id.TemplateId->getTemplateArgs(),
Id.TemplateId->NumArgs);
translateTemplateArguments(TemplateArgsPtr, Buffer);
TemplateName TName = Id.TemplateId->Template.get();
SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
NameInfo = Context.getNameForTemplate(TName, TNameLoc);
TemplateArgs = &Buffer;
} else {
NameInfo = GetNameFromUnqualifiedId(Id);
TemplateArgs = nullptr;
}
}
static void emitEmptyLookupTypoDiagnostic(
const TypoCorrection &TC, Sema &SemaRef, const CXXScopeSpec &SS,
DeclarationName Typo, SourceLocation TypoLoc, ArrayRef<Expr *> Args,
unsigned DiagnosticID, unsigned DiagnosticSuggestID) {
DeclContext *Ctx =
SS.isEmpty() ? nullptr : SemaRef.computeDeclContext(SS, false);
if (!TC) {
// Emit a special diagnostic for failed member lookups.
// FIXME: computing the declaration context might fail here (?)
if (Ctx)
SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << Ctx
<< SS.getRange();
else
SemaRef.Diag(TypoLoc, DiagnosticID) << Typo;
return;
}
std::string CorrectedStr = TC.getAsString(SemaRef.getLangOpts());
bool DroppedSpecifier =
TC.WillReplaceSpecifier() && Typo.getAsString() == CorrectedStr;
unsigned NoteID = TC.getCorrectionDeclAs<ImplicitParamDecl>()
? diag::note_implicit_param_decl
: diag::note_previous_decl;
if (!Ctx)
SemaRef.diagnoseTypo(TC, SemaRef.PDiag(DiagnosticSuggestID) << Typo,
SemaRef.PDiag(NoteID));
else
SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
<< Typo << Ctx << DroppedSpecifier
<< SS.getRange(),
SemaRef.PDiag(NoteID));
}
/// Diagnose a lookup that found results in an enclosing class during error
/// recovery. This usually indicates that the results were found in a dependent
/// base class that could not be searched as part of a template definition.
/// Always issues a diagnostic (though this may be only a warning in MS
/// compatibility mode).
///
/// Return \c true if the error is unrecoverable, or \c false if the caller
/// should attempt to recover using these lookup results.
bool Sema::DiagnoseDependentMemberLookup(const LookupResult &R) {
// During a default argument instantiation the CurContext points
// to a CXXMethodDecl; but we can't apply a this-> fixit inside a
// function parameter list, hence add an explicit check.
bool isDefaultArgument =
!CodeSynthesisContexts.empty() &&
CodeSynthesisContexts.back().Kind ==
CodeSynthesisContext::DefaultFunctionArgumentInstantiation;
const auto *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
bool isInstance = CurMethod && CurMethod->isInstance() &&
R.getNamingClass() == CurMethod->getParent() &&
!isDefaultArgument;
// There are two ways we can find a class-scope declaration during template
// instantiation that we did not find in the template definition: if it is a
// member of a dependent base class, or if it is declared after the point of
// use in the same class. Distinguish these by comparing the class in which
// the member was found to the naming class of the lookup.
unsigned DiagID = diag::err_found_in_dependent_base;
unsigned NoteID = diag::note_member_declared_at;
if (R.getRepresentativeDecl()->getDeclContext()->Equals(R.getNamingClass())) {
DiagID = getLangOpts().MSVCCompat ? diag::ext_found_later_in_class
: diag::err_found_later_in_class;
} else if (getLangOpts().MSVCCompat) {
DiagID = diag::ext_found_in_dependent_base;
NoteID = diag::note_dependent_member_use;
}
if (isInstance) {
// Give a code modification hint to insert 'this->'.
Diag(R.getNameLoc(), DiagID)
<< R.getLookupName()
<< FixItHint::CreateInsertion(R.getNameLoc(), "this->");
CheckCXXThisCapture(R.getNameLoc());
} else {
// FIXME: Add a FixItHint to insert 'Base::' or 'Derived::' (assuming
// they're not shadowed).
Diag(R.getNameLoc(), DiagID) << R.getLookupName();
}
for (const NamedDecl *D : R)
Diag(D->getLocation(), NoteID);
// Return true if we are inside a default argument instantiation
// and the found name refers to an instance member function, otherwise
// the caller will try to create an implicit member call and this is wrong
// for default arguments.
//
// FIXME: Is this special case necessary? We could allow the caller to
// diagnose this.
if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) {
Diag(R.getNameLoc(), diag::err_member_call_without_object) << 0;
return true;
}
// Tell the callee to try to recover.
return false;
}
/// Diagnose an empty lookup.
///
/// \return false if new lookup candidates were found
bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
CorrectionCandidateCallback &CCC,
TemplateArgumentListInfo *ExplicitTemplateArgs,
ArrayRef<Expr *> Args, DeclContext *LookupCtx,
TypoExpr **Out) {
DeclarationName Name = R.getLookupName();
unsigned diagnostic = diag::err_undeclared_var_use;
unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
diagnostic = diag::err_undeclared_use;
diagnostic_suggest = diag::err_undeclared_use_suggest;
}
// If the original lookup was an unqualified lookup, fake an
// unqualified lookup. This is useful when (for example) the
// original lookup would not have found something because it was a
// dependent name.
DeclContext *DC =
LookupCtx ? LookupCtx : (SS.isEmpty() ? CurContext : nullptr);
while (DC) {
if (isa<CXXRecordDecl>(DC)) {
LookupQualifiedName(R, DC);
if (!R.empty()) {
// Don't give errors about ambiguities in this lookup.
R.suppressDiagnostics();
// If there's a best viable function among the results, only mention
// that one in the notes.
OverloadCandidateSet Candidates(R.getNameLoc(),
OverloadCandidateSet::CSK_Normal);
AddOverloadedCallCandidates(R, ExplicitTemplateArgs, Args, Candidates);
OverloadCandidateSet::iterator Best;
if (Candidates.BestViableFunction(*this, R.getNameLoc(), Best) ==
OR_Success) {
R.clear();
R.addDecl(Best->FoundDecl.getDecl(), Best->FoundDecl.getAccess());
R.resolveKind();
}
return DiagnoseDependentMemberLookup(R);
}
R.clear();
}
DC = DC->getLookupParent();
}
// We didn't find anything, so try to correct for a typo.
TypoCorrection Corrected;
if (S && Out) {
SourceLocation TypoLoc = R.getNameLoc();
assert(!ExplicitTemplateArgs &&
"Diagnosing an empty lookup with explicit template args!");
*Out = CorrectTypoDelayed(
R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC,
[=](const TypoCorrection &TC) {
emitEmptyLookupTypoDiagnostic(TC, *this, SS, Name, TypoLoc, Args,
diagnostic, diagnostic_suggest);
},
nullptr, CTK_ErrorRecovery, LookupCtx);
if (*Out)
return true;
} else if (S && (Corrected =
CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S,
&SS, CCC, CTK_ErrorRecovery, LookupCtx))) {
std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
bool DroppedSpecifier =
Corrected.WillReplaceSpecifier() && Name.getAsString() == CorrectedStr;
R.setLookupName(Corrected.getCorrection());
bool AcceptableWithRecovery = false;
bool AcceptableWithoutRecovery = false;
NamedDecl *ND = Corrected.getFoundDecl();
if (ND) {
if (Corrected.isOverloaded()) {
OverloadCandidateSet OCS(R.getNameLoc(),
OverloadCandidateSet::CSK_Normal);
OverloadCandidateSet::iterator Best;
for (NamedDecl *CD : Corrected) {
if (FunctionTemplateDecl *FTD =
dyn_cast<FunctionTemplateDecl>(CD))
AddTemplateOverloadCandidate(
FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
Args, OCS);
else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
Args, OCS);
}
switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
case OR_Success:
ND = Best->FoundDecl;
Corrected.setCorrectionDecl(ND);
break;
default:
// FIXME: Arbitrarily pick the first declaration for the note.
Corrected.setCorrectionDecl(ND);
break;
}
}
R.addDecl(ND);
if (getLangOpts().CPlusPlus && ND->isCXXClassMember()) {
CXXRecordDecl *Record = nullptr;
if (Corrected.getCorrectionSpecifier()) {
const Type *Ty = Corrected.getCorrectionSpecifier()->getAsType();
Record = Ty->getAsCXXRecordDecl();
}
if (!Record)
Record = cast<CXXRecordDecl>(
ND->getDeclContext()->getRedeclContext());
R.setNamingClass(Record);
}
auto *UnderlyingND = ND->getUnderlyingDecl();
AcceptableWithRecovery = isa<ValueDecl>(UnderlyingND) ||
isa<FunctionTemplateDecl>(UnderlyingND);
// FIXME: If we ended up with a typo for a type name or
// Objective-C class name, we're in trouble because the parser
// is in the wrong place to recover. Suggest the typo
// correction, but don't make it a fix-it since we're not going
// to recover well anyway.
AcceptableWithoutRecovery = isa<TypeDecl>(UnderlyingND) ||
getAsTypeTemplateDecl(UnderlyingND) ||
isa<ObjCInterfaceDecl>(UnderlyingND);
} else {
// FIXME: We found a keyword. Suggest it, but don't provide a fix-it
// because we aren't able to recover.
AcceptableWithoutRecovery = true;
}
if (AcceptableWithRecovery || AcceptableWithoutRecovery) {
unsigned NoteID = Corrected.getCorrectionDeclAs<ImplicitParamDecl>()
? diag::note_implicit_param_decl
: diag::note_previous_decl;
if (SS.isEmpty())
diagnoseTypo(Corrected, PDiag(diagnostic_suggest) << Name,
PDiag(NoteID), AcceptableWithRecovery);
else
diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
<< Name << computeDeclContext(SS, false)
<< DroppedSpecifier << SS.getRange(),
PDiag(NoteID), AcceptableWithRecovery);
// Tell the callee whether to try to recover.
return !AcceptableWithRecovery;
}
}
R.clear();
// Emit a special diagnostic for failed member lookups.
// FIXME: computing the declaration context might fail here (?)
if (!SS.isEmpty()) {
Diag(R.getNameLoc(), diag::err_no_member)
<< Name << computeDeclContext(SS, false)
<< SS.getRange();
return true;
}
// Give up, we can't recover.
Diag(R.getNameLoc(), diagnostic) << Name;
return true;
}
/// In Microsoft mode, if we are inside a template class whose parent class has
/// dependent base classes, and we can't resolve an unqualified identifier, then
/// assume the identifier is a member of a dependent base class. We can only
/// recover successfully in static methods, instance methods, and other contexts
/// where 'this' is available. This doesn't precisely match MSVC's
/// instantiation model, but it's close enough.
static Expr *
recoverFromMSUnqualifiedLookup(Sema &S, ASTContext &Context,
DeclarationNameInfo &NameInfo,
SourceLocation TemplateKWLoc,
const TemplateArgumentListInfo *TemplateArgs) {
// Only try to recover from lookup into dependent bases in static methods or
// contexts where 'this' is available.
QualType ThisType = S.getCurrentThisType();
const CXXRecordDecl *RD = nullptr;
if (!ThisType.isNull())
RD = ThisType->getPointeeType()->getAsCXXRecordDecl();
else if (auto *MD = dyn_cast<CXXMethodDecl>(S.CurContext))
RD = MD->getParent();
if (!RD || !RD->hasDefinition() || !RD->hasAnyDependentBases())
return nullptr;
// Diagnose this as unqualified lookup into a dependent base class. If 'this'
// is available, suggest inserting 'this->' as a fixit.
SourceLocation Loc = NameInfo.getLoc();
auto DB = S.Diag(Loc, diag::ext_undeclared_unqual_id_with_dependent_base);
DB << NameInfo.getName() << RD;
if (!ThisType.isNull()) {
DB << FixItHint::CreateInsertion(Loc, "this->");
return CXXDependentScopeMemberExpr::Create(
Context, /*This=*/nullptr, ThisType, /*IsArrow=*/true,
/*Op=*/SourceLocation(), NestedNameSpecifierLoc(), TemplateKWLoc,
/*FirstQualifierFoundInScope=*/nullptr, NameInfo, TemplateArgs);
}
// Synthesize a fake NNS that points to the derived class. This will
// perform name lookup during template instantiation.
CXXScopeSpec SS;
auto *NNS =
NestedNameSpecifier::Create(Context, nullptr, true, RD->getTypeForDecl());
SS.MakeTrivial(Context, NNS, SourceRange(Loc, Loc));
return DependentScopeDeclRefExpr::Create(
Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
TemplateArgs);
}
ExprResult
Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
SourceLocation TemplateKWLoc, UnqualifiedId &Id,
bool HasTrailingLParen, bool IsAddressOfOperand,
CorrectionCandidateCallback *CCC,
bool IsInlineAsmIdentifier, Token *KeywordReplacement) {
assert(!(IsAddressOfOperand && HasTrailingLParen) &&
"cannot be direct & operand and have a trailing lparen");
if (SS.isInvalid())
return ExprError();
TemplateArgumentListInfo TemplateArgsBuffer;
// Decompose the UnqualifiedId into the following data.
DeclarationNameInfo NameInfo;
const TemplateArgumentListInfo *TemplateArgs;
DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
DeclarationName Name = NameInfo.getName();
IdentifierInfo *II = Name.getAsIdentifierInfo();
SourceLocation NameLoc = NameInfo.getLoc();
if (II && II->isEditorPlaceholder()) {
// FIXME: When typed placeholders are supported we can create a typed
// placeholder expression node.
return ExprError();
}
// C++ [temp.dep.expr]p3:
// An id-expression is type-dependent if it contains:
// -- an identifier that was declared with a dependent type,
// (note: handled after lookup)
// -- a template-id that is dependent,
// (note: handled in BuildTemplateIdExpr)
// -- a conversion-function-id that specifies a dependent type,
// -- a nested-name-specifier that contains a class-name that
// names a dependent type.
// Determine whether this is a member of an unknown specialization;
// we need to handle these differently.
bool DependentID = false;
if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
Name.getCXXNameType()->isDependentType()) {
DependentID = true;
} else if (SS.isSet()) {
if (DeclContext *DC = computeDeclContext(SS, false)) {
if (RequireCompleteDeclContext(SS, DC))
return ExprError();
} else {
DependentID = true;
}
}
if (DependentID)
return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
IsAddressOfOperand, TemplateArgs);
// BoundsSafety: This specially handles arguments of bounds attributes
// appertains to a type of C struct field such that the name lookup
// within a struct finds the member name, which is not the case for other
// contexts in C.
if (isBoundsAttrContext() && !getLangOpts().CPlusPlus && S->isClassScope()) {
// See if this is reference to a field of struct.
LookupResult R(*this, NameInfo, LookupMemberName);
// LookupParsedName handles a name lookup from within anonymous struct.
if (LookupParsedName(R, S, &SS)) {
if (auto *VD = dyn_cast<ValueDecl>(R.getFoundDecl())) {
QualType type = VD->getType().getNonReferenceType();
// This will eventually be translated into MemberExpr upon
// the use of instantiated struct fields.
return BuildDeclRefExpr(VD, type, VK_PRValue, NameLoc);
}
}
}
// Perform the required lookup.
LookupResult R(*this, NameInfo,
(Id.getKind() == UnqualifiedIdKind::IK_ImplicitSelfParam)
? LookupObjCImplicitSelfParam
: LookupOrdinaryName);
if (TemplateKWLoc.isValid() || TemplateArgs) {
// Lookup the template name again to correctly establish the context in
// which it was found. This is really unfortunate as we already did the
// lookup to determine that it was a template name in the first place. If
// this becomes a performance hit, we can work harder to preserve those
// results until we get here but it's likely not worth it.
bool MemberOfUnknownSpecialization;
AssumedTemplateKind AssumedTemplate;
if (LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
MemberOfUnknownSpecialization, TemplateKWLoc,
&AssumedTemplate))
return ExprError();
if (MemberOfUnknownSpecialization ||
(R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
IsAddressOfOperand, TemplateArgs);
} else {
bool IvarLookupFollowUp = II && !SS.isSet() && getCurMethodDecl();
LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
// If the result might be in a dependent base class, this is a dependent
// id-expression.
if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
IsAddressOfOperand, TemplateArgs);
// If this reference is in an Objective-C method, then we need to do
// some special Objective-C lookup, too.
if (IvarLookupFollowUp) {
ExprResult E(LookupInObjCMethod(R, S, II, true));
if (E.isInvalid())
return ExprError();
if (Expr *Ex = E.getAs<Expr>())
return Ex;
}
}
if (R.isAmbiguous())
return ExprError();
// This could be an implicitly declared function reference if the language
// mode allows it as a feature.
if (R.empty() && HasTrailingLParen && II &&
getLangOpts().implicitFunctionsAllowed()) {
NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
if (D) R.addDecl(D);
}
// Determine whether this name might be a candidate for
// argument-dependent lookup.
bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
if (R.empty() && !ADL) {
if (SS.isEmpty() && getLangOpts().MSVCCompat) {
if (Expr *E = recoverFromMSUnqualifiedLookup(*this, Context, NameInfo,
TemplateKWLoc, TemplateArgs))
return E;
}
// Don't diagnose an empty lookup for inline assembly.
if (IsInlineAsmIdentifier)
return ExprError();
// If this name wasn't predeclared and if this is not a function
// call, diagnose the problem.
TypoExpr *TE = nullptr;
DefaultFilterCCC DefaultValidator(II, SS.isValid() ? SS.getScopeRep()
: nullptr);
DefaultValidator.IsAddressOfOperand = IsAddressOfOperand;
assert((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) &&
"Typo correction callback misconfigured");
if (CCC) {
// Make sure the callback knows what the typo being diagnosed is.
CCC->setTypoName(II);
if (SS.isValid())
CCC->setTypoNNS(SS.getScopeRep());
}
// FIXME: DiagnoseEmptyLookup produces bad diagnostics if we're looking for
// a template name, but we happen to have always already looked up the name
// before we get here if it must be a template name.
if (DiagnoseEmptyLookup(S, SS, R, CCC ? *CCC : DefaultValidator, nullptr,
std::nullopt, nullptr, &TE)) {
if (TE && KeywordReplacement) {
auto &State = getTypoExprState(TE);
auto BestTC = State.Consumer->getNextCorrection();
if (BestTC.isKeyword()) {
auto *II = BestTC.getCorrectionAsIdentifierInfo();
if (State.DiagHandler)
State.DiagHandler(BestTC);
KeywordReplacement->startToken();
KeywordReplacement->setKind(II->getTokenID());
KeywordReplacement->setIdentifierInfo(II);
KeywordReplacement->setLocation(BestTC.getCorrectionRange().getBegin());
// Clean up the state associated with the TypoExpr, since it has
// now been diagnosed (without a call to CorrectDelayedTyposInExpr).
clearDelayedTypo(TE);
// Signal that a correction to a keyword was performed by returning a
// valid-but-null ExprResult.
return (Expr*)nullptr;
}
State.Consumer->resetCorrectionStream();
}
return TE ? TE : ExprError();
}
assert(!R.empty() &&
"DiagnoseEmptyLookup returned false but added no results");
// If we found an Objective-C instance variable, let
// LookupInObjCMethod build the appropriate expression to
// reference the ivar.
if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
R.clear();
ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
// In a hopelessly buggy code, Objective-C instance variable
// lookup fails and no expression will be built to reference it.
if (!E.isInvalid() && !E.get())
return ExprError();
return E;
}
}
// This is guaranteed from this point on.
assert(!R.empty() || ADL);
// Check whether this might be a C++ implicit instance member access.
// C++ [class.mfct.non-static]p3:
// When an id-expression that is not part of a class member access
// syntax and not used to form a pointer to member is used in the
// body of a non-static member function of class X, if name lookup
// resolves the name in the id-expression to a non-static non-type
// member of some class C, the id-expression is transformed into a
// class member access expression using (*this) as the
// postfix-expression to the left of the . operator.
//
// But we don't actually need to do this for '&' operands if R
// resolved to a function or overloaded function set, because the
// expression is ill-formed if it actually works out to be a
// non-static member function:
//
// C++ [expr.ref]p4:
// Otherwise, if E1.E2 refers to a non-static member function. . .
// [t]he expression can be used only as the left-hand operand of a
// member function call.
//
// There are other safeguards against such uses, but it's important
// to get this right here so that we don't end up making a
// spuriously dependent expression if we're inside a dependent
// instance method.
if (getLangOpts().CPlusPlus && !R.empty() &&
(*R.begin())->isCXXClassMember()) {
bool MightBeImplicitMember;
if (!IsAddressOfOperand)
MightBeImplicitMember = true;
else if (!SS.isEmpty())
MightBeImplicitMember = false;
else if (R.isOverloadedResult())
MightBeImplicitMember = false;
else if (R.isUnresolvableResult())
MightBeImplicitMember = true;
else
MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
isa<IndirectFieldDecl>(R.getFoundDecl()) ||
isa<MSPropertyDecl>(R.getFoundDecl());
if (MightBeImplicitMember)
return BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc,
R, TemplateArgs, S);
}
if (TemplateArgs || TemplateKWLoc.isValid()) {
// In C++1y, if this is a variable template id, then check it
// in BuildTemplateIdExpr().
// The single lookup result must be a variable template declaration.
if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId && Id.TemplateId &&
Id.TemplateId->Kind == TNK_Var_template) {
assert(R.getAsSingle<VarTemplateDecl>() &&
"There should only be one declaration found.");
}
return BuildTemplateIdExpr(SS, TemplateKWLoc, R, ADL, TemplateArgs);
}
return BuildDeclarationNameExpr(SS, R, ADL);
}
/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
/// declaration name, generally during template instantiation.
/// There's a large number of things which don't need to be done along
/// this path.
ExprResult Sema::BuildQualifiedDeclarationNameExpr(
CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo,
bool IsAddressOfOperand, const Scope *S, TypeSourceInfo **RecoveryTSI) {
if (NameInfo.getName().isDependentName())
return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
NameInfo, /*TemplateArgs=*/nullptr);
DeclContext *DC = computeDeclContext(SS, false);
if (!DC)
return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
NameInfo, /*TemplateArgs=*/nullptr);
if (RequireCompleteDeclContext(SS, DC))
return ExprError();
LookupResult R(*this, NameInfo, LookupOrdinaryName);
LookupQualifiedName(R, DC);
if (R.isAmbiguous())
return ExprError();
if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
NameInfo, /*TemplateArgs=*/nullptr);
if (R.empty()) {
// Don't diagnose problems with invalid record decl, the secondary no_member
// diagnostic during template instantiation is likely bogus, e.g. if a class
// is invalid because it's derived from an invalid base class, then missing
// members were likely supposed to be inherited.
if (const auto *CD = dyn_cast<CXXRecordDecl>(DC))
if (CD->isInvalidDecl())
return ExprError();
Diag(NameInfo.getLoc(), diag::err_no_member)
<< NameInfo.getName() << DC << SS.getRange();
return ExprError();
}
if (const TypeDecl *TD = R.getAsSingle<TypeDecl>()) {
// Diagnose a missing typename if this resolved unambiguously to a type in
// a dependent context. If we can recover with a type, downgrade this to
// a warning in Microsoft compatibility mode.
unsigned DiagID = diag::err_typename_missing;
if (RecoveryTSI && getLangOpts().MSVCCompat)
DiagID = diag::ext_typename_missing;
SourceLocation Loc = SS.getBeginLoc();
auto D = Diag(Loc, DiagID);
D << SS.getScopeRep() << NameInfo.getName().getAsString()
<< SourceRange(Loc, NameInfo.getEndLoc());
// Don't recover if the caller isn't expecting us to or if we're in a SFINAE
// context.
if (!RecoveryTSI)
return ExprError();
// Only issue the fixit if we're prepared to recover.
D << FixItHint::CreateInsertion(Loc, "typename ");
// Recover by pretending this was an elaborated type.
QualType Ty = Context.getTypeDeclType(TD);
TypeLocBuilder TLB;
TLB.pushTypeSpec(Ty).setNameLoc(NameInfo.getLoc());
QualType ET = getElaboratedType(ElaboratedTypeKeyword::None, SS, Ty);
ElaboratedTypeLoc QTL = TLB.push<ElaboratedTypeLoc>(ET);
QTL.setElaboratedKeywordLoc(SourceLocation());
QTL.setQualifierLoc(SS.getWithLocInContext(Context));
*RecoveryTSI = TLB.getTypeSourceInfo(Context, ET);
return ExprEmpty();
}
// Defend against this resolving to an implicit member access. We usually
// won't get here if this might be a legitimate a class member (we end up in
// BuildMemberReferenceExpr instead), but this can be valid if we're forming
// a pointer-to-member or in an unevaluated context in C++11.
if (!R.empty() && (*R.begin())->isCXXClassMember() && !IsAddressOfOperand)
return BuildPossibleImplicitMemberExpr(SS,
/*TemplateKWLoc=*/SourceLocation(),
R, /*TemplateArgs=*/nullptr, S);
return BuildDeclarationNameExpr(SS, R, /* ADL */ false);
}
/// The parser has read a name in, and Sema has detected that we're currently
/// inside an ObjC method. Perform some additional checks and determine if we
/// should form a reference to an ivar.
///
/// Ideally, most of this would be done by lookup, but there's
/// actually quite a lot of extra work involved.
DeclResult Sema::LookupIvarInObjCMethod(LookupResult &Lookup, Scope *S,
IdentifierInfo *II) {
SourceLocation Loc = Lookup.getNameLoc();
ObjCMethodDecl *CurMethod = getCurMethodDecl();
// Check for error condition which is already reported.
if (!CurMethod)
return DeclResult(true);
// There are two cases to handle here. 1) scoped lookup could have failed,
// in which case we should look for an ivar. 2) scoped lookup could have
// found a decl, but that decl is outside the current instance method (i.e.
// a global variable). In these two cases, we do a lookup for an ivar with
// this name, if the lookup sucedes, we replace it our current decl.
// If we're in a class method, we don't normally want to look for
// ivars. But if we don't find anything else, and there's an
// ivar, that's an error.
bool IsClassMethod = CurMethod->isClassMethod();
bool LookForIvars;
if (Lookup.empty())
LookForIvars = true;
else if (IsClassMethod)
LookForIvars = false;
else
LookForIvars = (Lookup.isSingleResult() &&
Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
ObjCInterfaceDecl *IFace = nullptr;
if (LookForIvars) {
IFace = CurMethod->getClassInterface();
ObjCInterfaceDecl *ClassDeclared;
ObjCIvarDecl *IV = nullptr;
if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
// Diagnose using an ivar in a class method.
if (IsClassMethod) {
Diag(Loc, diag::err_ivar_use_in_class_method) << IV->getDeclName();
return DeclResult(true);
}
// Diagnose the use of an ivar outside of the declaring class.
if (IV->getAccessControl() == ObjCIvarDecl::Private &&
!declaresSameEntity(ClassDeclared, IFace) &&
!getLangOpts().DebuggerSupport)
Diag(Loc, diag::err_private_ivar_access) << IV->getDeclName();
// Success.
return IV;
}
} else if (CurMethod->isInstanceMethod()) {
// We should warn if a local variable hides an ivar.
if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
ObjCInterfaceDecl *ClassDeclared;
if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
if (IV->getAccessControl() != ObjCIvarDecl::Private ||
declaresSameEntity(IFace, ClassDeclared))
Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
}
}
} else if (Lookup.isSingleResult() &&
Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) {
// If accessing a stand-alone ivar in a class method, this is an error.
if (const ObjCIvarDecl *IV =
dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl())) {
Diag(Loc, diag::err_ivar_use_in_class_method) << IV->getDeclName();
return DeclResult(true);
}
}
// Didn't encounter an error, didn't find an ivar.
return DeclResult(false);
}
ExprResult Sema::BuildIvarRefExpr(Scope *S, SourceLocation Loc,
ObjCIvarDecl *IV) {
ObjCMethodDecl *CurMethod = getCurMethodDecl();
assert(CurMethod && CurMethod->isInstanceMethod() &&
"should not reference ivar from this context");
ObjCInterfaceDecl *IFace = CurMethod->getClassInterface();
assert(IFace && "should not reference ivar from this context");
// If we're referencing an invalid decl, just return this as a silent
// error node. The error diagnostic was already emitted on the decl.
if (IV->isInvalidDecl())
return ExprError();
// Check if referencing a field with __attribute__((deprecated)).
if (DiagnoseUseOfDecl(IV, Loc))
return ExprError();
// FIXME: This should use a new expr for a direct reference, don't
// turn this into Self->ivar, just return a BareIVarExpr or something.
IdentifierInfo &II = Context.Idents.get("self");
UnqualifiedId SelfName;
SelfName.setImplicitSelfParam(&II);
CXXScopeSpec SelfScopeSpec;
SourceLocation TemplateKWLoc;
ExprResult SelfExpr =
ActOnIdExpression(S, SelfScopeSpec, TemplateKWLoc, SelfName,
/*HasTrailingLParen=*/false,
/*IsAddressOfOperand=*/false);
if (SelfExpr.isInvalid())
return ExprError();
SelfExpr = DefaultLvalueConversion(SelfExpr.get());
if (SelfExpr.isInvalid())
return ExprError();
MarkAnyDeclReferenced(Loc, IV, true);
ObjCMethodFamily MF = CurMethod->getMethodFamily();
if (MF != OMF_init && MF != OMF_dealloc && MF != OMF_finalize &&
!IvarBacksCurrentMethodAccessor(IFace, CurMethod, IV))
Diag(Loc, diag::warn_direct_ivar_access) << IV->getDeclName();
ObjCIvarRefExpr *Result = new (Context)
ObjCIvarRefExpr(IV, IV->getUsageType(SelfExpr.get()->getType()), Loc,
IV->getLocation(), SelfExpr.get(), true, true);
if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
if (!isUnevaluatedContext() &&
!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
getCurFunction()->recordUseOfWeak(Result);
}
if (getLangOpts().ObjCAutoRefCount && !isUnevaluatedContext())
if (const BlockDecl *BD = CurContext->getInnermostBlockDecl())
ImplicitlyRetainedSelfLocs.push_back({Loc, BD});
return Result;
}
/// The parser has read a name in, and Sema has detected that we're currently
/// inside an ObjC method. Perform some additional checks and determine if we
/// should form a reference to an ivar. If so, build an expression referencing
/// that ivar.
ExprResult
Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
IdentifierInfo *II, bool AllowBuiltinCreation) {
// FIXME: Integrate this lookup step into LookupParsedName.
DeclResult Ivar = LookupIvarInObjCMethod(Lookup, S, II);
if (Ivar.isInvalid())
return ExprError();
if (Ivar.isUsable())
return BuildIvarRefExpr(S, Lookup.getNameLoc(),
cast<ObjCIvarDecl>(Ivar.get()));
if (Lookup.empty() && II && AllowBuiltinCreation)
LookupBuiltin(Lookup);
// Sentinel value saying that we didn't do anything special.
return ExprResult(false);
}
/// Cast a base object to a member's actual type.
///
/// There are two relevant checks:
///
/// C++ [class.access.base]p7:
///
/// If a class member access operator [...] is used to access a non-static
/// data member or non-static member function, the reference is ill-formed if
/// the left operand [...] cannot be implicitly converted to a pointer to the
/// naming class of the right operand.
///
/// C++ [expr.ref]p7:
///
/// If E2 is a non-static data member or a non-static member function, the
/// program is ill-formed if the class of which E2 is directly a member is an
/// ambiguous base (11.8) of the naming class (11.9.3) of E2.
///
/// Note that the latter check does not consider access; the access of the
/// "real" base class is checked as appropriate when checking the access of the
/// member name.
ExprResult
Sema::PerformObjectMemberConversion(Expr *From,
NestedNameSpecifier *Qualifier,
NamedDecl *FoundDecl,
NamedDecl *Member) {
const auto *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
if (!RD)
return From;
QualType DestRecordType;
QualType DestType;
QualType FromRecordType;
QualType FromType = From->getType();
bool PointerConversions = false;
if (isa<FieldDecl>(Member)) {
DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
auto FromPtrType = FromType->getAs<PointerType>();
DestRecordType = Context.getAddrSpaceQualType(
DestRecordType, FromPtrType
? FromType->getPointeeType().getAddressSpace()
: FromType.getAddressSpace());
if (FromPtrType) {
DestType = Context.getPointerType(DestRecordType);
FromRecordType = FromPtrType->getPointeeType();
PointerConversions = true;
} else {
DestType = DestRecordType;
FromRecordType = FromType;
}
} else if (const auto *Method = dyn_cast<CXXMethodDecl>(Member)) {
if (!Method->isImplicitObjectMemberFunction())
return From;
DestType = Method->getThisType().getNonReferenceType();
DestRecordType = Method->getFunctionObjectParameterType();
if (FromType->getAs<PointerType>()) {
FromRecordType = FromType->getPointeeType();
PointerConversions = true;
} else {
FromRecordType = FromType;
DestType = DestRecordType;
}
LangAS FromAS = FromRecordType.getAddressSpace();
LangAS DestAS = DestRecordType.getAddressSpace();
if (FromAS != DestAS) {
QualType FromRecordTypeWithoutAS =
Context.removeAddrSpaceQualType(FromRecordType);
QualType FromTypeWithDestAS =
Context.getAddrSpaceQualType(FromRecordTypeWithoutAS, DestAS);
if (PointerConversions)
FromTypeWithDestAS = Context.getPointerType(FromTypeWithDestAS);
From = ImpCastExprToType(From, FromTypeWithDestAS,
CK_AddressSpaceConversion, From->getValueKind())
.get();
}
} else {
// No conversion necessary.
return From;
}
if (DestType->isDependentType() || FromType->isDependentType())
return From;
// If the unqualified types are the same, no conversion is necessary.
if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
return From;
SourceRange FromRange = From->getSourceRange();
SourceLocation FromLoc = FromRange.getBegin();
ExprValueKind VK = From->getValueKind();
// C++ [class.member.lookup]p8:
// [...] Ambiguities can often be resolved by qualifying a name with its
// class name.
//
// If the member was a qualified name and the qualified referred to a
// specific base subobject type, we'll cast to that intermediate type
// first and then to the object in which the member is declared. That allows
// one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
//
// class Base { public: int x; };
// class Derived1 : public Base { };
// class Derived2 : public Base { };
// class VeryDerived : public Derived1, public Derived2 { void f(); };
//
// void VeryDerived::f() {
// x = 17; // error: ambiguous base subobjects
// Derived1::x = 17; // okay, pick the Base subobject of Derived1
// }
if (Qualifier && Qualifier->getAsType()) {
QualType QType = QualType(Qualifier->getAsType(), 0);
assert(QType->isRecordType() && "lookup done with non-record type");
QualType QRecordType = QualType(QType->castAs<RecordType>(), 0);
// In C++98, the qualifier type doesn't actually have to be a base
// type of the object type, in which case we just ignore it.
// Otherwise build the appropriate casts.
if (IsDerivedFrom(FromLoc, FromRecordType, QRecordType)) {
CXXCastPath BasePath;
if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
FromLoc, FromRange, &BasePath))
return ExprError();
if (PointerConversions)
QType = Context.getPointerType(QType);
From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
VK, &BasePath).get();
FromType = QType;
FromRecordType = QRecordType;
// If the qualifier type was the same as the destination type,
// we're done.
if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
return From;
}
}
CXXCastPath BasePath;
if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
FromLoc, FromRange, &BasePath,
/*IgnoreAccess=*/true))
return ExprError();
return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
VK, &BasePath);
}
bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
const LookupResult &R,
bool HasTrailingLParen) {
// Only when used directly as the postfix-expression of a call.
if (!HasTrailingLParen)
return false;
// Never if a scope specifier was provided.
if (SS.isSet())
return false;
// Only in C++ or ObjC++.
if (!getLangOpts().CPlusPlus)
return false;
// Turn off ADL when we find certain kinds of declarations during
// normal lookup:
for (const NamedDecl *D : R) {
// C++0x [basic.lookup.argdep]p3:
// -- a declaration of a class member
// Since using decls preserve this property, we check this on the
// original decl.
if (D->isCXXClassMember())
return false;
// C++0x [basic.lookup.argdep]p3:
// -- a block-scope function declaration that is not a
// using-declaration
// NOTE: we also trigger this for function templates (in fact, we
// don't check the decl type at all, since all other decl types
// turn off ADL anyway).
if (isa<UsingShadowDecl>(D))
D = cast<UsingShadowDecl>(D)->getTargetDecl();
else if (D->getLexicalDeclContext()->isFunctionOrMethod())
return false;
// C++0x [basic.lookup.argdep]p3:
// -- a declaration that is neither a function or a function
// template
// And also for builtin functions.
if (const auto *FDecl = dyn_cast<FunctionDecl>(D)) {
// But also builtin functions.
if (FDecl->getBuiltinID() && FDecl->isImplicit())
return false;
} else if (!isa<FunctionTemplateDecl>(D))
return false;
}
return true;
}
/// Diagnoses obvious problems with the use of the given declaration
/// as an expression. This is only actually called for lookups that
/// were not overloaded, and it doesn't promise that the declaration
/// will in fact be used.
static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D,
bool AcceptInvalid) {
if (D->isInvalidDecl() && !AcceptInvalid)
return true;
if (isa<TypedefNameDecl>(D)) {
S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
return true;
}
if (isa<ObjCInterfaceDecl>(D)) {
S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
return true;
}
if (isa<NamespaceDecl>(D)) {
S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
return true;
}
return false;
}
// Certain multiversion types should be treated as overloaded even when there is
// only one result.
static bool ShouldLookupResultBeMultiVersionOverload(const LookupResult &R) {
assert(R.isSingleResult() && "Expected only a single result");
const auto *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
return FD &&
(FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion());
}
ExprResult Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
LookupResult &R, bool NeedsADL,
bool AcceptInvalidDecl) {
// If this is a single, fully-resolved result and we don't need ADL,
// just build an ordinary singleton decl ref.
if (!NeedsADL && R.isSingleResult() &&
!R.getAsSingle<FunctionTemplateDecl>() &&
!ShouldLookupResultBeMultiVersionOverload(R))
return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), R.getFoundDecl(),
R.getRepresentativeDecl(), nullptr,
AcceptInvalidDecl);
// We only need to check the declaration if there's exactly one
// result, because in the overloaded case the results can only be
// functions and function templates.
if (R.isSingleResult() && !ShouldLookupResultBeMultiVersionOverload(R) &&
CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl(),
AcceptInvalidDecl))
return ExprError();
// Otherwise, just build an unresolved lookup expression. Suppress
// any lookup-related diagnostics; we'll hash these out later, when
// we've picked a target.
R.suppressDiagnostics();
UnresolvedLookupExpr *ULE
= UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
SS.getWithLocInContext(Context),
R.getLookupNameInfo(),
NeedsADL, R.isOverloadedResult(),
R.begin(), R.end());
return ULE;
}
static void diagnoseUncapturableValueReferenceOrBinding(Sema &S,
SourceLocation loc,
ValueDecl *var);
/// Complete semantic analysis for a reference to the given declaration.
ExprResult Sema::BuildDeclarationNameExpr(
const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
NamedDecl *FoundD, const TemplateArgumentListInfo *TemplateArgs,
bool AcceptInvalidDecl) {
assert(D && "Cannot refer to a NULL declaration");
assert(!isa<FunctionTemplateDecl>(D) &&
"Cannot refer unambiguously to a function template");
SourceLocation Loc = NameInfo.getLoc();
if (CheckDeclInExpr(*this, Loc, D, AcceptInvalidDecl)) {
// Recovery from invalid cases (e.g. D is an invalid Decl).
// We use the dependent type for the RecoveryExpr to prevent bogus follow-up
// diagnostics, as invalid decls use int as a fallback type.
return CreateRecoveryExpr(NameInfo.getBeginLoc(), NameInfo.getEndLoc(), {});
}
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
// Specifically diagnose references to class templates that are missing
// a template argument list.
diagnoseMissingTemplateArguments(TemplateName(Template), Loc);
return ExprError();
}
// Make sure that we're referring to a value.
if (!isa<ValueDecl, UnresolvedUsingIfExistsDecl>(D)) {
Diag(Loc, diag::err_ref_non_value) << D << SS.getRange();
Diag(D->getLocation(), diag::note_declared_at);
return ExprError();
}
// Check whether this declaration can be used. Note that we suppress
// this check when we're going to perform argument-dependent lookup
// on this function name, because this might not be the function
// that overload resolution actually selects.
if (DiagnoseUseOfDecl(D, Loc))
return ExprError();
auto *VD = cast<ValueDecl>(D);
// Only create DeclRefExpr's for valid Decl's.
if (VD->isInvalidDecl() && !AcceptInvalidDecl)
return ExprError();
// Handle members of anonymous structs and unions. If we got here,
// and the reference is to a class member indirect field, then this
// must be the subject of a pointer-to-member expression.
if (auto *IndirectField = dyn_cast<IndirectFieldDecl>(VD);
IndirectField && !IndirectField->isCXXClassMember())
return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
IndirectField);
QualType type = VD->getType();
if (type.isNull())
return ExprError();
ExprValueKind valueKind = VK_PRValue;
// In 'T ...V;', the type of the declaration 'V' is 'T...', but the type of
// a reference to 'V' is simply (unexpanded) 'T'. The type, like the value,
// is expanded by some outer '...' in the context of the use.
type = type.getNonPackExpansionType();
switch (D->getKind()) {
// Ignore all the non-ValueDecl kinds.
#define ABSTRACT_DECL(kind)
#define VALUE(type, base)
#define DECL(type, base) case Decl::type:
#include "clang/AST/DeclNodes.inc"
llvm_unreachable("invalid value decl kind");
// These shouldn't make it here.
case Decl::ObjCAtDefsField:
llvm_unreachable("forming non-member reference to ivar?");
// Enum constants are always r-values and never references.
// Unresolved using declarations are dependent.
case Decl::EnumConstant:
case Decl::UnresolvedUsingValue:
case Decl::OMPDeclareReduction:
case Decl::OMPDeclareMapper:
valueKind = VK_PRValue;
break;
// Fields and indirect fields that got here must be for
// pointer-to-member expressions; we just call them l-values for
// internal consistency, because this subexpression doesn't really
// exist in the high-level semantics.
case Decl::Field:
case Decl::IndirectField:
case Decl::ObjCIvar:
assert((getLangOpts().CPlusPlus || isBoundsAttrContext()) &&
"building reference to field in C?");
// These can't have reference type in well-formed programs, but
// for internal consistency we do this anyway.
type = type.getNonReferenceType();
valueKind = VK_LValue;
break;
// Non-type template parameters are either l-values or r-values
// depending on the type.
case Decl::NonTypeTemplateParm: {
if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
type = reftype->getPointeeType();
valueKind = VK_LValue; // even if the parameter is an r-value reference
break;
}
// [expr.prim.id.unqual]p2:
// If the entity is a template parameter object for a template
// parameter of type T, the type of the expression is const T.
// [...] The expression is an lvalue if the entity is a [...] template
// parameter object.
if (type->isRecordType()) {
type = type.getUnqualifiedType().withConst();
valueKind = VK_LValue;
break;
}
// For non-references, we need to strip qualifiers just in case
// the template parameter was declared as 'const int' or whatever.
valueKind = VK_PRValue;
type = type.getUnqualifiedType();
break;
}
case Decl::Var:
case Decl::VarTemplateSpecialization:
case Decl::VarTemplatePartialSpecialization:
case Decl::Decomposition:
case Decl::OMPCapturedExpr:
// In C, "extern void blah;" is valid and is an r-value.
if (!getLangOpts().CPlusPlus && !type.hasQualifiers() &&
type->isVoidType()) {
valueKind = VK_PRValue;
break;
}
[[fallthrough]];
case Decl::ImplicitParam:
case Decl::ParmVar: {
// These are always l-values.
valueKind = VK_LValue;
type = type.getNonReferenceType();
// FIXME: Does the addition of const really only apply in
// potentially-evaluated contexts? Since the variable isn't actually
// captured in an unevaluated context, it seems that the answer is no.
if (!isUnevaluatedContext()) {
QualType CapturedType = getCapturedDeclRefType(cast<VarDecl>(VD), Loc);
if (!CapturedType.isNull())
type = CapturedType;
}
break;
}
case Decl::Binding:
// These are always lvalues.
valueKind = VK_LValue;
type = type.getNonReferenceType();
break;
case Decl::Function: {
if (unsigned BID = cast<FunctionDecl>(VD)->getBuiltinID()) {
if (!Context.BuiltinInfo.isDirectlyAddressable(BID)) {
type = Context.BuiltinFnTy;
valueKind = VK_PRValue;
break;
}
}
const FunctionType *fty = type->castAs<FunctionType>();
// If we're referring to a function with an __unknown_anytype
// result type, make the entire expression __unknown_anytype.
if (fty->getReturnType() == Context.UnknownAnyTy) {
type = Context.UnknownAnyTy;
valueKind = VK_PRValue;
break;
}
// Functions are l-values in C++.
if (getLangOpts().CPlusPlus) {
valueKind = VK_LValue;
break;
}
// C99 DR 316 says that, if a function type comes from a
// function definition (without a prototype), that type is only
// used for checking compatibility. Therefore, when referencing
// the function, we pretend that we don't have the full function
// type.
if (!cast<FunctionDecl>(VD)->hasPrototype() && isa<FunctionProtoType>(fty))
type = Context.getFunctionNoProtoType(fty->getReturnType(),
fty->getExtInfo());
// Functions are r-values in C.
valueKind = VK_PRValue;
break;
}
case Decl::CXXDeductionGuide:
llvm_unreachable("building reference to deduction guide");
case Decl::MSProperty:
case Decl::MSGuid:
case Decl::TemplateParamObject:
// FIXME: Should MSGuidDecl and template parameter objects be subject to
// capture in OpenMP, or duplicated between host and device?
valueKind = VK_LValue;
break;
case Decl::UnnamedGlobalConstant:
valueKind = VK_LValue;
break;
case Decl::CXXMethod:
// If we're referring to a method with an __unknown_anytype
// result type, make the entire expression __unknown_anytype.
// This should only be possible with a type written directly.
if (const FunctionProtoType *proto =
dyn_cast<FunctionProtoType>(VD->getType()))
if (proto->getReturnType() == Context.UnknownAnyTy) {
type = Context.UnknownAnyTy;
valueKind = VK_PRValue;
break;
}
// C++ methods are l-values if static, r-values if non-static.
if (cast<CXXMethodDecl>(VD)->isStatic()) {
valueKind = VK_LValue;
break;
}
[[fallthrough]];
case Decl::CXXConversion:
case Decl::CXXDestructor:
case Decl::CXXConstructor:
valueKind = VK_PRValue;
break;
}
auto *E =
BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS, FoundD,
/*FIXME: TemplateKWLoc*/ SourceLocation(), TemplateArgs);
// Clang AST consumers assume a DeclRefExpr refers to a valid decl. We
// wrap a DeclRefExpr referring to an invalid decl with a dependent-type
// RecoveryExpr to avoid follow-up semantic analysis (thus prevent bogus
// diagnostics).
if (VD->isInvalidDecl() && E)
return CreateRecoveryExpr(E->getBeginLoc(), E->getEndLoc(), {E});
return E;
}
static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source,
SmallString<32> &Target) {
Target.resize(CharByteWidth * (Source.size() + 1));
char *ResultPtr = &Target[0];
const llvm::UTF8 *ErrorPtr;
bool success =
llvm::ConvertUTF8toWide(CharByteWidth, Source, ResultPtr, ErrorPtr);
(void)success;
assert(success);
Target.resize(ResultPtr - &Target[0]);
}
ExprResult Sema::BuildPredefinedExpr(SourceLocation Loc,
PredefinedIdentKind IK) {
Decl *currentDecl = getPredefinedExprDecl(CurContext);
if (!currentDecl) {
Diag(Loc, diag::ext_predef_outside_function);
currentDecl = Context.getTranslationUnitDecl();
}
QualType ResTy;
StringLiteral *SL = nullptr;
if (cast<DeclContext>(currentDecl)->isDependentContext())
ResTy = Context.DependentTy;
else {
// Pre-defined identifiers are of type char[x], where x is the length of
// the string.
bool ForceElaboratedPrinting =
IK == PredefinedIdentKind::Function && getLangOpts().MSVCCompat;
auto Str =
PredefinedExpr::ComputeName(IK, currentDecl, ForceElaboratedPrinting);
unsigned Length = Str.length();
llvm::APInt LengthI(32, Length + 1);
if (IK == PredefinedIdentKind::LFunction ||
IK == PredefinedIdentKind::LFuncSig) {
ResTy =
Context.adjustStringLiteralBaseType(Context.WideCharTy.withConst());
SmallString<32> RawChars;
ConvertUTF8ToWideString(Context.getTypeSizeInChars(ResTy).getQuantity(),
Str, RawChars);
ResTy = Context.getConstantArrayType(ResTy, LengthI, nullptr,
ArraySizeModifier::Normal,
/*IndexTypeQuals*/ 0);
SL = StringLiteral::Create(Context, RawChars, StringLiteralKind::Wide,
/*Pascal*/ false, ResTy, Loc);
} else {
ResTy = Context.adjustStringLiteralBaseType(Context.CharTy.withConst());
ResTy = Context.getConstantArrayType(ResTy, LengthI, nullptr,
ArraySizeModifier::Normal,
/*IndexTypeQuals*/ 0);
SL = StringLiteral::Create(Context, Str, StringLiteralKind::Ordinary,
/*Pascal*/ false, ResTy, Loc);
}
}
return PredefinedExpr::Create(Context, Loc, ResTy, IK, LangOpts.MicrosoftExt,
SL);
}
ExprResult Sema::BuildSYCLUniqueStableNameExpr(SourceLocation OpLoc,
SourceLocation LParen,
SourceLocation RParen,
TypeSourceInfo *TSI) {
return SYCLUniqueStableNameExpr::Create(Context, OpLoc, LParen, RParen, TSI);
}
ExprResult Sema::ActOnSYCLUniqueStableNameExpr(SourceLocation OpLoc,
SourceLocation LParen,
SourceLocation RParen,
ParsedType ParsedTy) {
TypeSourceInfo *TSI = nullptr;
QualType Ty = GetTypeFromParser(ParsedTy, &TSI);
if (Ty.isNull())
return ExprError();
if (!TSI)
TSI = Context.getTrivialTypeSourceInfo(Ty, LParen);
return BuildSYCLUniqueStableNameExpr(OpLoc, LParen, RParen, TSI);
}
ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
return BuildPredefinedExpr(Loc, getPredefinedExprKind(Kind));
}
ExprResult Sema::ActOnCharacterConstant(const Token &Tok, Scope *UDLScope) {
SmallString<16> CharBuffer;
bool Invalid = false;
StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
if (Invalid)
return ExprError();
CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
PP, Tok.getKind());
if (Literal.hadError())
return ExprError();
QualType Ty;
if (Literal.isWide())
Ty = Context.WideCharTy; // L'x' -> wchar_t in C and C++.
else if (Literal.isUTF8() && getLangOpts().C23)
Ty = Context.UnsignedCharTy; // u8'x' -> unsigned char in C23
else if (Literal.isUTF8() && getLangOpts().Char8)
Ty = Context.Char8Ty; // u8'x' -> char8_t when it exists.
else if (Literal.isUTF16())
Ty = Context.Char16Ty; // u'x' -> char16_t in C11 and C++11.
else if (Literal.isUTF32())
Ty = Context.Char32Ty; // U'x' -> char32_t in C11 and C++11.
else if (!getLangOpts().CPlusPlus || Literal.isMultiChar())
Ty = Context.IntTy; // 'x' -> int in C, 'wxyz' -> int in C++.
else
Ty = Context.CharTy; // 'x' -> char in C++;
// u8'x' -> char in C11-C17 and in C++ without char8_t.
CharacterLiteralKind Kind = CharacterLiteralKind::Ascii;
if (Literal.isWide())
Kind = CharacterLiteralKind::Wide;
else if (Literal.isUTF16())
Kind = CharacterLiteralKind::UTF16;
else if (Literal.isUTF32())
Kind = CharacterLiteralKind::UTF32;
else if (Literal.isUTF8())
Kind = CharacterLiteralKind::UTF8;
Expr *Lit = new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
Tok.getLocation());
if (Literal.getUDSuffix().empty())
return Lit;
// We're building a user-defined literal.
IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
SourceLocation UDSuffixLoc =
getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
// Make sure we're allowed user-defined literals here.
if (!UDLScope)
return ExprError(Diag(UDSuffixLoc, diag::err_invalid_character_udl));
// C++11 [lex.ext]p6: The literal L is treated as a call of the form
// operator "" X (ch)
return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc,
Lit, Tok.getLocation());
}
ExprResult Sema::ActOnIntegerConstant(SourceLocation Loc, uint64_t Val) {
unsigned IntSize = Context.getTargetInfo().getIntWidth();
return IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val),
Context.IntTy, Loc);
}
static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal,
QualType Ty, SourceLocation Loc) {
const llvm::fltSemantics &Format = S.Context.getFloatTypeSemantics(Ty);
using llvm::APFloat;
APFloat Val(Format);
APFloat::opStatus result = Literal.GetFloatValue(Val);
// Overflow is always an error, but underflow is only an error if
// we underflowed to zero (APFloat reports denormals as underflow).
if ((result & APFloat::opOverflow) ||
((result & APFloat::opUnderflow) && Val.isZero())) {
unsigned diagnostic;
SmallString<20> buffer;
if (result & APFloat::opOverflow) {
diagnostic = diag::warn_float_overflow;
APFloat::getLargest(Format).toString(buffer);
} else {
diagnostic = diag::warn_float_underflow;
APFloat::getSmallest(Format).toString(buffer);
}
S.Diag(Loc, diagnostic)
<< Ty
<< StringRef(buffer.data(), buffer.size());
}
bool isExact = (result == APFloat::opOK);
return FloatingLiteral::Create(S.Context, Val, isExact, Ty, Loc);
}
bool Sema::CheckLoopHintExpr(Expr *E, SourceLocation Loc) {
assert(E && "Invalid expression");
if (E->isValueDependent())
return false;
QualType QT = E->getType();
if (!QT->isIntegerType() || QT->isBooleanType() || QT->isCharType()) {
Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_type) << QT;
return true;
}
llvm::APSInt ValueAPS;
ExprResult R = VerifyIntegerConstantExpression(E, &ValueAPS);
if (R.isInvalid())
return true;
bool ValueIsPositive = ValueAPS.isStrictlyPositive();
if (!ValueIsPositive || ValueAPS.getActiveBits() > 31) {
Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_value)
<< toString(ValueAPS, 10) << ValueIsPositive;
return true;
}
return false;
}
ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
// Fast path for a single digit (which is quite common). A single digit
// cannot have a trigraph, escaped newline, radix prefix, or suffix.
if (Tok.getLength() == 1) {
const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
return ActOnIntegerConstant(Tok.getLocation(), Val-'0');
}
SmallString<128> SpellingBuffer;
// NumericLiteralParser wants to overread by one character. Add padding to
// the buffer in case the token is copied to the buffer. If getSpelling()
// returns a StringRef to the memory buffer, it should have a null char at
// the EOF, so it is also safe.
SpellingBuffer.resize(Tok.getLength() + 1);
// Get the spelling of the token, which eliminates trigraphs, etc.
bool Invalid = false;
StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
if (Invalid)
return ExprError();
NumericLiteralParser Literal(TokSpelling, Tok.getLocation(),
PP.getSourceManager(), PP.getLangOpts(),
PP.getTargetInfo(), PP.getDiagnostics());
if (Literal.hadError)
return ExprError();
if (Literal.hasUDSuffix()) {
// We're building a user-defined literal.
const IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
SourceLocation UDSuffixLoc =
getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
// Make sure we're allowed user-defined literals here.
if (!UDLScope)
return ExprError(Diag(UDSuffixLoc, diag::err_invalid_numeric_udl));
QualType CookedTy;
if (Literal.isFloatingLiteral()) {
// C++11 [lex.ext]p4: If S contains a literal operator with parameter type
// long double, the literal is treated as a call of the form
// operator "" X (f L)
CookedTy = Context.LongDoubleTy;
} else {
// C++11 [lex.ext]p3: If S contains a literal operator with parameter type
// unsigned long long, the literal is treated as a call of the form
// operator "" X (n ULL)
CookedTy = Context.UnsignedLongLongTy;
}
DeclarationName OpName =
Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
SourceLocation TokLoc = Tok.getLocation();
// Perform literal operator lookup to determine if we're building a raw
// literal or a cooked one.
LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
switch (LookupLiteralOperator(UDLScope, R, CookedTy,
/*AllowRaw*/ true, /*AllowTemplate*/ true,
/*AllowStringTemplatePack*/ false,
/*DiagnoseMissing*/ !Literal.isImaginary)) {
case LOLR_ErrorNoDiagnostic:
// Lookup failure for imaginary constants isn't fatal, there's still the
// GNU extension producing _Complex types.
break;
case LOLR_Error:
return ExprError();
case LOLR_Cooked: {
Expr *Lit;
if (Literal.isFloatingLiteral()) {
Lit = BuildFloatingLiteral(*this, Literal, CookedTy, Tok.getLocation());
} else {
llvm::APInt ResultVal(Context.getTargetInfo().getLongLongWidth(), 0);
if (Literal.GetIntegerValue(ResultVal))
Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
<< /* Unsigned */ 1;
Lit = IntegerLiteral::Create(Context, ResultVal, CookedTy,
Tok.getLocation());
}
return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
}
case LOLR_Raw: {
// C++11 [lit.ext]p3, p4: If S contains a raw literal operator, the
// literal is treated as a call of the form
// operator "" X ("n")
unsigned Length = Literal.getUDSuffixOffset();
QualType StrTy = Context.getConstantArrayType(
Context.adjustStringLiteralBaseType(Context.CharTy.withConst()),
llvm::APInt(32, Length + 1), nullptr, ArraySizeModifier::Normal, 0);
Expr *Lit =
StringLiteral::Create(Context, StringRef(TokSpelling.data(), Length),
StringLiteralKind::Ordinary,
/*Pascal*/ false, StrTy, &TokLoc, 1);
return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
}
case LOLR_Template: {
// C++11 [lit.ext]p3, p4: Otherwise (S contains a literal operator
// template), L is treated as a call fo the form
// operator "" X <'c1', 'c2', ... 'ck'>()
// where n is the source character sequence c1 c2 ... ck.
TemplateArgumentListInfo ExplicitArgs;
unsigned CharBits = Context.getIntWidth(Context.CharTy);
bool CharIsUnsigned = Context.CharTy->isUnsignedIntegerType();
llvm::APSInt Value(CharBits, CharIsUnsigned);
for (unsigned I = 0, N = Literal.getUDSuffixOffset(); I != N; ++I) {
Value = TokSpelling[I];
TemplateArgument Arg(Context, Value, Context.CharTy);
TemplateArgumentLocInfo ArgInfo;
ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
}
return BuildLiteralOperatorCall(R, OpNameInfo, std::nullopt, TokLoc,
&ExplicitArgs);
}
case LOLR_StringTemplatePack:
llvm_unreachable("unexpected literal operator lookup result");
}
}
Expr *Res;
if (Literal.isFixedPointLiteral()) {
QualType Ty;
if (Literal.isAccum) {
if (Literal.isHalf) {
Ty = Context.ShortAccumTy;
} else if (Literal.isLong) {
Ty = Context.LongAccumTy;
} else {
Ty = Context.AccumTy;
}
} else if (Literal.isFract) {
if (Literal.isHalf) {
Ty = Context.ShortFractTy;
} else if (Literal.isLong) {
Ty = Context.LongFractTy;
} else {
Ty = Context.FractTy;
}
}
if (Literal.isUnsigned) Ty = Context.getCorrespondingUnsignedType(Ty);
bool isSigned = !Literal.isUnsigned;
unsigned scale = Context.getFixedPointScale(Ty);
unsigned bit_width = Context.getTypeInfo(Ty).Width;
llvm::APInt Val(bit_width, 0, isSigned);
bool Overflowed = Literal.GetFixedPointValue(Val, scale);
bool ValIsZero = Val.isZero() && !Overflowed;
auto MaxVal = Context.getFixedPointMax(Ty).getValue();
if (Literal.isFract && Val == MaxVal + 1 && !ValIsZero)
// Clause 6.4.4 - The value of a constant shall be in the range of
// representable values for its type, with exception for constants of a
// fract type with a value of exactly 1; such a constant shall denote
// the maximal value for the type.
--Val;
else if (Val.ugt(MaxVal) || Overflowed)
Diag(Tok.getLocation(), diag::err_too_large_for_fixed_point);
Res = FixedPointLiteral::CreateFromRawInt(Context, Val, Ty,
Tok.getLocation(), scale);
} else if (Literal.isFloatingLiteral()) {
QualType Ty;
if (Literal.isHalf){
if (getOpenCLOptions().isAvailableOption("cl_khr_fp16", getLangOpts()))
Ty = Context.HalfTy;
else {
Diag(Tok.getLocation(), diag::err_half_const_requires_fp16);
return ExprError();
}
} else if (Literal.isFloat)
Ty = Context.FloatTy;
else if (Literal.isLong)
Ty = Context.LongDoubleTy;
else if (Literal.isFloat16)
Ty = Context.Float16Ty;
else if (Literal.isFloat128)
Ty = Context.Float128Ty;
else
Ty = Context.DoubleTy;
Res = BuildFloatingLiteral(*this, Literal, Ty, Tok.getLocation());
if (Ty == Context.DoubleTy) {
if (getLangOpts().SinglePrecisionConstants) {
if (Ty->castAs<BuiltinType>()->getKind() != BuiltinType::Float) {
Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
}
} else if (getLangOpts().OpenCL && !getOpenCLOptions().isAvailableOption(
"cl_khr_fp64", getLangOpts())) {
// Impose single-precision float type when cl_khr_fp64 is not enabled.
Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64)
<< (getLangOpts().getOpenCLCompatibleVersion() >= 300);
Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
}
}
} else if (!Literal.isIntegerLiteral()) {
return ExprError();
} else {
QualType Ty;
// 'z/uz' literals are a C++23 feature.
if (Literal.isSizeT)
Diag(Tok.getLocation(), getLangOpts().CPlusPlus
? getLangOpts().CPlusPlus23
? diag::warn_cxx20_compat_size_t_suffix
: diag::ext_cxx23_size_t_suffix
: diag::err_cxx23_size_t_suffix);
// 'wb/uwb' literals are a C23 feature. We support _BitInt as a type in C++,
// but we do not currently support the suffix in C++ mode because it's not
// entirely clear whether WG21 will prefer this suffix to return a library
// type such as std::bit_int instead of returning a _BitInt.
if (Literal.isBitInt && !getLangOpts().CPlusPlus)
PP.Diag(Tok.getLocation(), getLangOpts().C23
? diag::warn_c23_compat_bitint_suffix
: diag::ext_c23_bitint_suffix);
// Get the value in the widest-possible width. What is "widest" depends on
// whether the literal is a bit-precise integer or not. For a bit-precise
// integer type, try to scan the source to determine how many bits are
// needed to represent the value. This may seem a bit expensive, but trying
// to get the integer value from an overly-wide APInt is *extremely*
// expensive, so the naive approach of assuming
// llvm::IntegerType::MAX_INT_BITS is a big performance hit.
unsigned BitsNeeded =
Literal.isBitInt ? llvm::APInt::getSufficientBitsNeeded(
Literal.getLiteralDigits(), Literal.getRadix())
: Context.getTargetInfo().getIntMaxTWidth();
llvm::APInt ResultVal(BitsNeeded, 0);
if (Literal.GetIntegerValue(ResultVal)) {
// If this value didn't fit into uintmax_t, error and force to ull.
Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
<< /* Unsigned */ 1;
Ty = Context.UnsignedLongLongTy;
assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
"long long is not intmax_t?");
} else {
// If this value fits into a ULL, try to figure out what else it fits into
// according to the rules of C99 6.4.4.1p5.
// Octal, Hexadecimal, and integers with a U suffix are allowed to
// be an unsigned int.
bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
// Check from smallest to largest, picking the smallest type we can.
unsigned Width = 0;
// Microsoft specific integer suffixes are explicitly sized.
if (Literal.MicrosoftInteger) {
if (Literal.MicrosoftInteger == 8 && !Literal.isUnsigned) {
Width = 8;
Ty = Context.CharTy;
} else {
Width = Literal.MicrosoftInteger;
Ty = Context.getIntTypeForBitwidth(Width,
/*Signed=*/!Literal.isUnsigned);
}
}
// Bit-precise integer literals are automagically-sized based on the
// width required by the literal.
if (Literal.isBitInt) {
// The signed version has one more bit for the sign value. There are no
// zero-width bit-precise integers, even if the literal value is 0.
Width = std::max(ResultVal.getActiveBits(), 1u) +
(Literal.isUnsigned ? 0u : 1u);
// Diagnose if the width of the constant is larger than BITINT_MAXWIDTH,
// and reset the type to the largest supported width.
unsigned int MaxBitIntWidth =
Context.getTargetInfo().getMaxBitIntWidth();
if (Width > MaxBitIntWidth) {
Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
<< Literal.isUnsigned;
Width = MaxBitIntWidth;
}
// Reset the result value to the smaller APInt and select the correct
// type to be used. Note, we zext even for signed values because the
// literal itself is always an unsigned value (a preceeding - is a
// unary operator, not part of the literal).
ResultVal = ResultVal.zextOrTrunc(Width);
Ty = Context.getBitIntType(Literal.isUnsigned, Width);
}
// Check C++23 size_t literals.
if (Literal.isSizeT) {
assert(!Literal.MicrosoftInteger &&
"size_t literals can't be Microsoft literals");
unsigned SizeTSize = Context.getTargetInfo().getTypeWidth(
Context.getTargetInfo().getSizeType());
// Does it fit in size_t?
if (ResultVal.isIntN(SizeTSize)) {
// Does it fit in ssize_t?
if (!Literal.isUnsigned && ResultVal[SizeTSize - 1] == 0)
Ty = Context.getSignedSizeType();
else if (AllowUnsigned)
Ty = Context.getSizeType();
Width = SizeTSize;
}
}
if (Ty.isNull() && !Literal.isLong && !Literal.isLongLong &&
!Literal.isSizeT) {
// Are int/unsigned possibilities?
unsigned IntSize = Context.getTargetInfo().getIntWidth();
// Does it fit in a unsigned int?
if (ResultVal.isIntN(IntSize)) {
// Does it fit in a signed int?
if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Ty = Context.IntTy;
else if (AllowUnsigned)
Ty = Context.UnsignedIntTy;
Width = IntSize;
}
}
// Are long/unsigned long possibilities?
if (Ty.isNull() && !Literal.isLongLong && !Literal.isSizeT) {
unsigned LongSize = Context.getTargetInfo().getLongWidth();
// Does it fit in a unsigned long?
if (ResultVal.isIntN(LongSize)) {
// Does it fit in a signed long?
if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Ty = Context.LongTy;
else if (AllowUnsigned)
Ty = Context.UnsignedLongTy;
// Check according to the rules of C90 6.1.3.2p5. C++03 [lex.icon]p2
// is compatible.
else if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11) {
const unsigned LongLongSize =
Context.getTargetInfo().getLongLongWidth();
Diag(Tok.getLocation(),
getLangOpts().CPlusPlus
? Literal.isLong
? diag::warn_old_implicitly_unsigned_long_cxx
: /*C++98 UB*/ diag::
ext_old_implicitly_unsigned_long_cxx
: diag::warn_old_implicitly_unsigned_long)
<< (LongLongSize > LongSize ? /*will have type 'long long'*/ 0
: /*will be ill-formed*/ 1);
Ty = Context.UnsignedLongTy;
}
Width = LongSize;
}
}
// Check long long if needed.
if (Ty.isNull() && !Literal.isSizeT) {
unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();
// Does it fit in a unsigned long long?
if (ResultVal.isIntN(LongLongSize)) {
// Does it fit in a signed long long?
// To be compatible with MSVC, hex integer literals ending with the
// LL or i64 suffix are always signed in Microsoft mode.
if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
(getLangOpts().MSVCCompat && Literal.isLongLong)))
Ty = Context.LongLongTy;
else if (AllowUnsigned)
Ty = Context.UnsignedLongLongTy;
Width = LongLongSize;
// 'long long' is a C99 or C++11 feature, whether the literal
// explicitly specified 'long long' or we needed the extra width.
if (getLangOpts().CPlusPlus)
Diag(Tok.getLocation(), getLangOpts().CPlusPlus11
? diag::warn_cxx98_compat_longlong
: diag::ext_cxx11_longlong);
else if (!getLangOpts().C99)
Diag(Tok.getLocation(), diag::ext_c99_longlong);
}
}
// If we still couldn't decide a type, we either have 'size_t' literal
// that is out of range, or a decimal literal that does not fit in a
// signed long long and has no U suffix.
if (Ty.isNull()) {
if (Literal.isSizeT)
Diag(Tok.getLocation(), diag::err_size_t_literal_too_large)
<< Literal.isUnsigned;
else
Diag(Tok.getLocation(),
diag::ext_integer_literal_too_large_for_signed);
Ty = Context.UnsignedLongLongTy;
Width = Context.getTargetInfo().getLongLongWidth();
}
if (ResultVal.getBitWidth() != Width)
ResultVal = ResultVal.trunc(Width);
}
Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
}
// If this is an imaginary literal, create the ImaginaryLiteral wrapper.
if (Literal.isImaginary) {
Res = new (Context) ImaginaryLiteral(Res,
Context.getComplexType(Res->getType()));
Diag(Tok.getLocation(), diag::ext_imaginary_constant);
}
return Res;
}
ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
assert(E && "ActOnParenExpr() missing expr");
QualType ExprTy = E->getType();
if (getLangOpts().ProtectParens && CurFPFeatures.getAllowFPReassociate() &&
!E->isLValue() && ExprTy->hasFloatingRepresentation())
return BuildBuiltinCallExpr(R, Builtin::BI__arithmetic_fence, E);
return new (Context) ParenExpr(L, R, E);
}
static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
SourceLocation Loc,
SourceRange ArgRange) {
// [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
// scalar or vector data type argument..."
// Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
// type (C99 6.2.5p18) or void.
if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
<< T << ArgRange;
return true;
}
assert((T->isVoidType() || !T->isIncompleteType()) &&
"Scalar types should always be complete");
return false;
}
static bool CheckVectorElementsTraitOperandType(Sema &S, QualType T,
SourceLocation Loc,
SourceRange ArgRange) {
// builtin_vectorelements supports both fixed-sized and scalable vectors.
if (!T->isVectorType() && !T->isSizelessVectorType())
return S.Diag(Loc, diag::err_builtin_non_vector_type)
<< ""
<< "__builtin_vectorelements" << T << ArgRange;
return false;
}
static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
SourceLocation Loc,
SourceRange ArgRange,
UnaryExprOrTypeTrait TraitKind) {
// Invalid types must be hard errors for SFINAE in C++.
if (S.LangOpts.CPlusPlus)
return true;
// C99 6.5.3.4p1:
if (T->isFunctionType() &&
(TraitKind == UETT_SizeOf || TraitKind == UETT_AlignOf ||
TraitKind == UETT_PreferredAlignOf)) {
// sizeof(function)/alignof(function) is allowed as an extension.
S.Diag(Loc, diag::ext_sizeof_alignof_function_type)
<< getTraitSpelling(TraitKind) << ArgRange;
return false;
}
// Allow sizeof(void)/alignof(void) as an extension, unless in OpenCL where
// this is an error (OpenCL v1.1 s6.3.k)
if (T->isVoidType()) {
unsigned DiagID = S.LangOpts.OpenCL ? diag::err_opencl_sizeof_alignof_type
: diag::ext_sizeof_alignof_void_type;
S.Diag(Loc, DiagID) << getTraitSpelling(TraitKind) << ArgRange;
return false;
}
return true;
}
static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
SourceLocation Loc,
SourceRange ArgRange,
UnaryExprOrTypeTrait TraitKind) {
// Reject sizeof(interface) and sizeof(interface<proto>) if the
// runtime doesn't allow it.
if (!S.LangOpts.ObjCRuntime.allowsSizeofAlignof() && T->isObjCObjectType()) {
S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
<< T << (TraitKind == UETT_SizeOf)
<< ArgRange;
return true;
}
return false;
}
/// Check whether E is a pointer from a decayed array type (the decayed
/// pointer type is equal to T) and emit a warning if it is.
static void warnOnSizeofOnArrayDecay(Sema &S, SourceLocation Loc, QualType T,
const Expr *E) {
// Don't warn if the operation changed the type.
if (T != E->getType())
return;
// Now look for array decays.
const auto *ICE = dyn_cast<ImplicitCastExpr>(E);
if (!ICE || ICE->getCastKind() != CK_ArrayToPointerDecay)
return;
S.Diag(Loc, diag::warn_sizeof_array_decay) << ICE->getSourceRange()
<< ICE->getType()
<< ICE->getSubExpr()->getType();
}
/// Check the constraints on expression operands to unary type expression
/// and type traits.
///
/// Completes any types necessary and validates the constraints on the operand
/// expression. The logic mostly mirrors the type-based overload, but may modify
/// the expression as it completes the type for that expression through template
/// instantiation, etc.
bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
UnaryExprOrTypeTrait ExprKind) {
QualType ExprTy = E->getType();
assert(!ExprTy->isReferenceType());
bool IsUnevaluatedOperand =
(ExprKind == UETT_SizeOf || ExprKind == UETT_DataSizeOf ||
ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf ||
ExprKind == UETT_VecStep);
if (IsUnevaluatedOperand) {
ExprResult Result = CheckUnevaluatedOperand(E);
if (Result.isInvalid())
return true;
E = Result.get();
}
// The operand for sizeof and alignof is in an unevaluated expression context,
// so side effects could result in unintended consequences.
// Exclude instantiation-dependent expressions, because 'sizeof' is sometimes
// used to build SFINAE gadgets.
// FIXME: Should we consider instantiation-dependent operands to 'alignof'?
if (IsUnevaluatedOperand && !inTemplateInstantiation() &&
!E->isInstantiationDependent() &&
!E->getType()->isVariableArrayType() &&
E->HasSideEffects(Context, false))
Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
if (ExprKind == UETT_VecStep)
return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
E->getSourceRange());
if (ExprKind == UETT_VectorElements)
return CheckVectorElementsTraitOperandType(*this, ExprTy, E->getExprLoc(),
E->getSourceRange());
// Explicitly list some types as extensions.
if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
E->getSourceRange(), ExprKind))
return false;
// WebAssembly tables are always illegal operands to unary expressions and
// type traits.
if (Context.getTargetInfo().getTriple().isWasm() &&
E->getType()->isWebAssemblyTableType()) {
Diag(E->getExprLoc(), diag::err_wasm_table_invalid_uett_operand)
<< getTraitSpelling(ExprKind);
return true;
}
// 'alignof' applied to an expression only requires the base element type of
// the expression to be complete. 'sizeof' requires the expression's type to
// be complete (and will attempt to complete it if it's an array of unknown
// bound).
if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
if (RequireCompleteSizedType(
E->getExprLoc(), Context.getBaseElementType(E->getType()),
diag::err_sizeof_alignof_incomplete_or_sizeless_type,
getTraitSpelling(ExprKind), E->getSourceRange()))
return true;
} else {
if (RequireCompleteSizedExprType(
E, diag::err_sizeof_alignof_incomplete_or_sizeless_type,
getTraitSpelling(ExprKind), E->getSourceRange()))
return true;
}
// Completing the expression's type may have changed it.
ExprTy = E->getType();
assert(!ExprTy->isReferenceType());
if (ExprTy->isFunctionType()) {
Diag(E->getExprLoc(), diag::err_sizeof_alignof_function_type)
<< getTraitSpelling(ExprKind) << E->getSourceRange();
return true;
}
if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
E->getSourceRange(), ExprKind))
return true;
if (ExprKind == UETT_SizeOf) {
if (const auto *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
if (const auto *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
QualType OType = PVD->getOriginalType();
QualType Type = PVD->getType();
if (Type->isPointerType() && OType->isArrayType()) {
Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
<< Type << OType;
Diag(PVD->getLocation(), diag::note_declared_at);
}
}
}
// Warn on "sizeof(array op x)" and "sizeof(x op array)", where the array
// decays into a pointer and returns an unintended result. This is most
// likely a typo for "sizeof(array) op x".
if (const auto *BO = dyn_cast<BinaryOperator>(E->IgnoreParens())) {
warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
BO->getLHS());
warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
BO->getRHS());
}
}
return false;
}
static bool CheckAlignOfExpr(Sema &S, Expr *E, UnaryExprOrTypeTrait ExprKind) {
// Cannot know anything else if the expression is dependent.
if (E->isTypeDependent())
return false;
if (E->getObjectKind() == OK_BitField) {
S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield)
<< 1 << E->getSourceRange();
return true;
}
ValueDecl *D = nullptr;
Expr *Inner = E->IgnoreParens();
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Inner)) {
D = DRE->getDecl();
} else if (MemberExpr *ME = dyn_cast<MemberExpr>(Inner)) {
D = ME->getMemberDecl();
}
// If it's a field, require the containing struct to have a
// complete definition so that we can compute the layout.
//
// This can happen in C++11 onwards, either by naming the member
// in a way that is not transformed into a member access expression
// (in an unevaluated operand, for instance), or by naming the member
// in a trailing-return-type.
//
// For the record, since __alignof__ on expressions is a GCC
// extension, GCC seems to permit this but always gives the
// nonsensical answer 0.
//
// We don't really need the layout here --- we could instead just
// directly check for all the appropriate alignment-lowing
// attributes --- but that would require duplicating a lot of
// logic that just isn't worth duplicating for such a marginal
// use-case.
if (FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) {
// Fast path this check, since we at least know the record has a
// definition if we can find a member of it.
if (!FD->getParent()->isCompleteDefinition()) {
S.Diag(E->getExprLoc(), diag::err_alignof_member_of_incomplete_type)
<< E->getSourceRange();
return true;
}
// Otherwise, if it's a field, and the field doesn't have
// reference type, then it must have a complete type (or be a
// flexible array member, which we explicitly want to
// white-list anyway), which makes the following checks trivial.
if (!FD->getType()->isReferenceType())
return false;
}
return S.CheckUnaryExprOrTypeTraitOperand(E, ExprKind);
}
bool Sema::CheckVecStepExpr(Expr *E) {
E = E->IgnoreParens();
// Cannot know anything else if the expression is dependent.
if (E->isTypeDependent())
return false;
return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
}
static void captureVariablyModifiedType(ASTContext &Context, QualType T,
CapturingScopeInfo *CSI) {
assert(T->isVariablyModifiedType());
assert(CSI != nullptr);
// We're going to walk down into the type and look for VLA expressions.
do {
const Type *Ty = T.getTypePtr();
switch (Ty->getTypeClass()) {
#define TYPE(Class, Base)
#define ABSTRACT_TYPE(Class, Base)
#define NON_CANONICAL_TYPE(Class, Base)
#define DEPENDENT_TYPE(Class, Base) case Type::Class:
#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
#include "clang/AST/TypeNodes.inc"
T = QualType();
break;
// These types are never variably-modified.
case Type::Builtin:
case Type::Complex:
case Type::Vector:
case Type::ExtVector:
case Type::ConstantMatrix:
case Type::Record:
case Type::Enum:
case Type::TemplateSpecialization:
case Type::ObjCObject:
case Type::ObjCInterface:
case Type::ObjCObjectPointer:
case Type::ObjCTypeParam:
case Type::Pipe:
case Type::BitInt:
llvm_unreachable("type class is never variably-modified!");
case Type::Elaborated:
T = cast<ElaboratedType>(Ty)->getNamedType();
break;
case Type::Adjusted:
T = cast<AdjustedType>(Ty)->getOriginalType();
break;
case Type::Decayed:
T = cast<DecayedType>(Ty)->getPointeeType();
break;
case Type::Pointer:
T = cast<PointerType>(Ty)->getPointeeType();
break;
case Type::BlockPointer:
T = cast<BlockPointerType>(Ty)->getPointeeType();
break;
case Type::LValueReference:
case Type::RValueReference:
T = cast<ReferenceType>(Ty)->getPointeeType();
break;
case Type::MemberPointer:
T = cast<MemberPointerType>(Ty)->getPointeeType();
break;
case Type::ConstantArray:
case Type::IncompleteArray:
// Losing element qualification here is fine.
T = cast<ArrayType>(Ty)->getElementType();
break;
case Type::VariableArray: {
// Losing element qualification here is fine.
const VariableArrayType *VAT = cast<VariableArrayType>(Ty);
// Unknown size indication requires no size computation.
// Otherwise, evaluate and record it.
auto Size = VAT->getSizeExpr();
if (Size && !CSI->isVLATypeCaptured(VAT) &&
(isa<CapturedRegionScopeInfo>(CSI) || isa<LambdaScopeInfo>(CSI)))
CSI->addVLATypeCapture(Size->getExprLoc(), VAT, Context.getSizeType());
T = VAT->getElementType();
break;
}
case Type::FunctionProto:
case Type::FunctionNoProto:
T = cast<FunctionType>(Ty)->getReturnType();
break;
case Type::Paren:
case Type::TypeOf:
case Type::UnaryTransform:
case Type::Attributed:
case Type::BTFTagAttributed:
case Type::SubstTemplateTypeParm:
case Type::MacroQualified:
case Type::CountAttributed:
// Keep walking after single level desugaring.
T = T.getSingleStepDesugaredType(Context);
break;
case Type::Typedef:
T = cast<TypedefType>(Ty)->desugar();
break;
case Type::Decltype:
T = cast<DecltypeType>(Ty)->desugar();
break;
case Type::PackIndexing:
T = cast<PackIndexingType>(Ty)->desugar();
break;
case Type::Using:
T = cast<UsingType>(Ty)->desugar();
break;
case Type::Auto:
case Type::DeducedTemplateSpecialization:
T = cast<DeducedType>(Ty)->getDeducedType();
break;
case Type::TypeOfExpr:
T = cast<TypeOfExprType>(Ty)->getUnderlyingExpr()->getType();
break;
case Type::Atomic:
T = cast<AtomicType>(Ty)->getValueType();
break;
}
} while (!T.isNull() && T->isVariablyModifiedType());
}
/// Check the constraints on operands to unary expression and type
/// traits.
///
/// This will complete any types necessary, and validate the various constraints
/// on those operands.
///
/// The UsualUnaryConversions() function is *not* called by this routine.
/// C99 6.3.2.1p[2-4] all state:
/// Except when it is the operand of the sizeof operator ...
///
/// C++ [expr.sizeof]p4
/// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
/// standard conversions are not applied to the operand of sizeof.
///
/// This policy is followed for all of the unary trait expressions.
bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
SourceLocation OpLoc,
SourceRange ExprRange,
UnaryExprOrTypeTrait ExprKind,
StringRef KWName) {
if (ExprType->isDependentType())
return false;
// C++ [expr.sizeof]p2:
// When applied to a reference or a reference type, the result
// is the size of the referenced type.
// C++11 [expr.alignof]p3:
// When alignof is applied to a reference type, the result
// shall be the alignment of the referenced type.
if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
ExprType = Ref->getPointeeType();
// C11 6.5.3.4/3, C++11 [expr.alignof]p3:
// When alignof or _Alignof is applied to an array type, the result
// is the alignment of the element type.
if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf ||
ExprKind == UETT_OpenMPRequiredSimdAlign)
ExprType = Context.getBaseElementType(ExprType);
if (ExprKind == UETT_VecStep)
return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);
if (ExprKind == UETT_VectorElements)
return CheckVectorElementsTraitOperandType(*this, ExprType, OpLoc,
ExprRange);
// Explicitly list some types as extensions.
if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
ExprKind))
return false;
if (RequireCompleteSizedType(
OpLoc, ExprType, diag::err_sizeof_alignof_incomplete_or_sizeless_type,
KWName, ExprRange))
return true;
if (ExprType->isFunctionType()) {
Diag(OpLoc, diag::err_sizeof_alignof_function_type) << KWName << ExprRange;
return true;
}
// WebAssembly tables are always illegal operands to unary expressions and
// type traits.
if (Context.getTargetInfo().getTriple().isWasm() &&
ExprType->isWebAssemblyTableType()) {
Diag(OpLoc, diag::err_wasm_table_invalid_uett_operand)
<< getTraitSpelling(ExprKind);
return true;
}
if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
ExprKind))
return true;
if (ExprType->isVariablyModifiedType() && FunctionScopes.size() > 1) {
if (auto *TT = ExprType->getAs<TypedefType>()) {
for (auto I = FunctionScopes.rbegin(),
E = std::prev(FunctionScopes.rend());
I != E; ++I) {
auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
if (CSI == nullptr)
break;
DeclContext *DC = nullptr;
if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
DC = LSI->CallOperator;
else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
DC = CRSI->TheCapturedDecl;
else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
DC = BSI->TheDecl;
if (DC) {
if (DC->containsDecl(TT->getDecl()))
break;
captureVariablyModifiedType(Context, ExprType, CSI);
}
}
}
}
return false;
}
/// Build a sizeof or alignof expression given a type operand.
ExprResult Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
SourceLocation OpLoc,
UnaryExprOrTypeTrait ExprKind,
SourceRange R) {
if (!TInfo)
return ExprError();
QualType T = TInfo->getType();
if (!T->isDependentType() &&
CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind,
getTraitSpelling(ExprKind)))
return ExprError();
// Adds overload of TransformToPotentiallyEvaluated for TypeSourceInfo to
// properly deal with VLAs in nested calls of sizeof and typeof.
if (isUnevaluatedContext() && ExprKind == UETT_SizeOf &&
TInfo->getType()->isVariablyModifiedType())
TInfo = TransformToPotentiallyEvaluated(TInfo);
// C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
return new (Context) UnaryExprOrTypeTraitExpr(
ExprKind, TInfo, Context.getSizeType(), OpLoc, R.getEnd());
}
/// Build a sizeof or alignof expression given an expression
/// operand.
ExprResult
Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
UnaryExprOrTypeTrait ExprKind) {
ExprResult PE = CheckPlaceholderExpr(E);
if (PE.isInvalid())
return ExprError();
E = PE.get();
// Verify that the operand is valid.
bool isInvalid = false;
if (E->isTypeDependent()) {
// Delay type-checking for type-dependent expressions.
} else if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
isInvalid = CheckAlignOfExpr(*this, E, ExprKind);
} else if (ExprKind == UETT_VecStep) {
isInvalid = CheckVecStepExpr(E);
} else if (ExprKind == UETT_OpenMPRequiredSimdAlign) {
Diag(E->getExprLoc(), diag::err_openmp_default_simd_align_expr);
isInvalid = true;
} else if (E->refersToBitField()) { // C99 6.5.3.4p1.
Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 0;
isInvalid = true;
} else if (ExprKind == UETT_VectorElements) {
isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_VectorElements);
} else {
isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
}
if (isInvalid)
return ExprError();
if (ExprKind == UETT_SizeOf && E->getType()->isVariableArrayType()) {
PE = TransformToPotentiallyEvaluated(E);
if (PE.isInvalid()) return ExprError();
E = PE.get();
}
// C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
return new (Context) UnaryExprOrTypeTraitExpr(
ExprKind, E, Context.getSizeType(), OpLoc, E->getSourceRange().getEnd());
}
/// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
/// expr and the same for @c alignof and @c __alignof
/// Note that the ArgRange is invalid if isType is false.
ExprResult
Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
UnaryExprOrTypeTrait ExprKind, bool IsType,
void *TyOrEx, SourceRange ArgRange) {
// If error parsing type, ignore.
if (!TyOrEx) return ExprError();
if (IsType) {
TypeSourceInfo *TInfo;
(void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
}
Expr *ArgEx = (Expr *)TyOrEx;
ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
return Result;
}
bool Sema::CheckAlignasTypeArgument(StringRef KWName, TypeSourceInfo *TInfo,
SourceLocation OpLoc, SourceRange R) {
if (!TInfo)
return true;
return CheckUnaryExprOrTypeTraitOperand(TInfo->getType(), OpLoc, R,
UETT_AlignOf, KWName);
}
/// ActOnAlignasTypeArgument - Handle @c alignas(type-id) and @c
/// _Alignas(type-name) .
/// [dcl.align] An alignment-specifier of the form
/// alignas(type-id) has the same effect as alignas(alignof(type-id)).
///
/// [N1570 6.7.5] _Alignas(type-name) is equivalent to
/// _Alignas(_Alignof(type-name)).
bool Sema::ActOnAlignasTypeArgument(StringRef KWName, ParsedType Ty,
SourceLocation OpLoc, SourceRange R) {
TypeSourceInfo *TInfo;
(void)GetTypeFromParser(ParsedType::getFromOpaquePtr(Ty.getAsOpaquePtr()),
&TInfo);
return CheckAlignasTypeArgument(KWName, TInfo, OpLoc, R);
}
static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
bool IsReal) {
if (V.get()->isTypeDependent())
return S.Context.DependentTy;
// _Real and _Imag are only l-values for normal l-values.
if (V.get()->getObjectKind() != OK_Ordinary) {
V = S.DefaultLvalueConversion(V.get());
if (V.isInvalid())
return QualType();
}
// These operators return the element type of a complex type.
if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
return CT->getElementType();
// Otherwise they pass through real integer and floating point types here.
if (V.get()->getType()->isArithmeticType())
return V.get()->getType();
// Test for placeholders.
ExprResult PR = S.CheckPlaceholderExpr(V.get());
if (PR.isInvalid()) return QualType();
if (PR.get() != V.get()) {
V = PR;
return CheckRealImagOperand(S, V, Loc, IsReal);
}
// Reject anything else.
S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
<< (IsReal ? "__real" : "__imag");
return QualType();
}
ExprResult
Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
tok::TokenKind Kind, Expr *Input) {
UnaryOperatorKind Opc;
switch (Kind) {
default: llvm_unreachable("Unknown unary op!");
case tok::plusplus: Opc = UO_PostInc; break;
case tok::minusminus: Opc = UO_PostDec; break;
}
// Since this might is a postfix expression, get rid of ParenListExprs.
ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Input);
if (Result.isInvalid()) return ExprError();
Input = Result.get();
return BuildUnaryOp(S, OpLoc, Opc, Input);
}
/// Diagnose if arithmetic on the given ObjC pointer is illegal.
///
/// \return true on error
static bool checkArithmeticOnObjCPointer(Sema &S,
SourceLocation opLoc,
Expr *op) {
assert(op->getType()->isObjCObjectPointerType());
if (S.LangOpts.ObjCRuntime.allowsPointerArithmetic() &&
!S.LangOpts.ObjCSubscriptingLegacyRuntime)
return false;
S.Diag(opLoc, diag::err_arithmetic_nonfragile_interface)
<< op->getType()->castAs<ObjCObjectPointerType>()->getPointeeType()
<< op->getSourceRange();
return true;
}
static bool isMSPropertySubscriptExpr(Sema &S, Expr *Base) {
auto *BaseNoParens = Base->IgnoreParens();
if (auto *MSProp = dyn_cast<MSPropertyRefExpr>(BaseNoParens))
return MSProp->getPropertyDecl()->getType()->isArrayType();
return isa<MSPropertySubscriptExpr>(BaseNoParens);
}
// Returns the type used for LHS[RHS], given one of LHS, RHS is type-dependent.
// Typically this is DependentTy, but can sometimes be more precise.
//
// There are cases when we could determine a non-dependent type:
// - LHS and RHS may have non-dependent types despite being type-dependent
// (e.g. unbounded array static members of the current instantiation)
// - one may be a dependent-sized array with known element type
// - one may be a dependent-typed valid index (enum in current instantiation)
//
// We *always* return a dependent type, in such cases it is DependentTy.
// This avoids creating type-dependent expressions with non-dependent types.
// FIXME: is this important to avoid? See https://reviews.llvm.org/D107275
static QualType getDependentArraySubscriptType(Expr *LHS, Expr *RHS,
const ASTContext &Ctx) {
assert(LHS->isTypeDependent() || RHS->isTypeDependent());
QualType LTy = LHS->getType(), RTy = RHS->getType();
QualType Result = Ctx.DependentTy;
if (RTy->isIntegralOrUnscopedEnumerationType()) {
if (const PointerType *PT = LTy->getAs<PointerType>())
Result = PT->getPointeeType();
else if (const ArrayType *AT = LTy->getAsArrayTypeUnsafe())
Result = AT->getElementType();
} else if (LTy->isIntegralOrUnscopedEnumerationType()) {
if (const PointerType *PT = RTy->getAs<PointerType>())
Result = PT->getPointeeType();
else if (const ArrayType *AT = RTy->getAsArrayTypeUnsafe())
Result = AT->getElementType();
}
// Ensure we return a dependent type.
return Result->isDependentType() ? Result : Ctx.DependentTy;
}
ExprResult Sema::ActOnArraySubscriptExpr(Scope *S, Expr *base,
SourceLocation lbLoc,
MultiExprArg ArgExprs,
SourceLocation rbLoc) {
if (base && !base->getType().isNull() &&
base->hasPlaceholderType(BuiltinType::OMPArraySection))
return ActOnOMPArraySectionExpr(base, lbLoc, ArgExprs.front(), SourceLocation(),
SourceLocation(), /*Length*/ nullptr,
/*Stride=*/nullptr, rbLoc);
// Since this might be a postfix expression, get rid of ParenListExprs.
if (isa<ParenListExpr>(base)) {
ExprResult result = MaybeConvertParenListExprToParenExpr(S, base);
if (result.isInvalid())
return ExprError();
base = result.get();
}
// Check if base and idx form a MatrixSubscriptExpr.
//
// Helper to check for comma expressions, which are not allowed as indices for
// matrix subscript expressions.
auto CheckAndReportCommaError = [this, base, rbLoc](Expr *E) {
if (isa<BinaryOperator>(E) && cast<BinaryOperator>(E)->isCommaOp()) {
Diag(E->getExprLoc(), diag::err_matrix_subscript_comma)
<< SourceRange(base->getBeginLoc(), rbLoc);
return true;
}
return false;
};
// The matrix subscript operator ([][])is considered a single operator.
// Separating the index expressions by parenthesis is not allowed.
if (base && !base->getType().isNull() &&
base->hasPlaceholderType(BuiltinType::IncompleteMatrixIdx) &&
!isa<MatrixSubscriptExpr>(base)) {
Diag(base->getExprLoc(), diag::err_matrix_separate_incomplete_index)
<< SourceRange(base->getBeginLoc(), rbLoc);
return ExprError();
}
// If the base is a MatrixSubscriptExpr, try to create a new
// MatrixSubscriptExpr.
auto *matSubscriptE = dyn_cast<MatrixSubscriptExpr>(base);
if (matSubscriptE) {
assert(ArgExprs.size() == 1);
if (CheckAndReportCommaError(ArgExprs.front()))
return ExprError();
assert(matSubscriptE->isIncomplete() &&
"base has to be an incomplete matrix subscript");
return CreateBuiltinMatrixSubscriptExpr(matSubscriptE->getBase(),
matSubscriptE->getRowIdx(),
ArgExprs.front(), rbLoc);
}
if (base->getType()->isWebAssemblyTableType()) {
Diag(base->getExprLoc(), diag::err_wasm_table_art)
<< SourceRange(base->getBeginLoc(), rbLoc) << 3;
return ExprError();
}
// Handle any non-overload placeholder types in the base and index
// expressions. We can't handle overloads here because the other
// operand might be an overloadable type, in which case the overload
// resolution for the operator overload should get the first crack
// at the overload.
bool IsMSPropertySubscript = false;
if (base->getType()->isNonOverloadPlaceholderType()) {
IsMSPropertySubscript = isMSPropertySubscriptExpr(*this, base);
if (!IsMSPropertySubscript) {
ExprResult result = CheckPlaceholderExpr(base);
if (result.isInvalid())
return ExprError();
base = result.get();
}
}
// If the base is a matrix type, try to create a new MatrixSubscriptExpr.
if (base->getType()->isMatrixType()) {
assert(ArgExprs.size() == 1);
if (CheckAndReportCommaError(ArgExprs.front()))
return ExprError();
return CreateBuiltinMatrixSubscriptExpr(base, ArgExprs.front(), nullptr,
rbLoc);
}
if (ArgExprs.size() == 1 && getLangOpts().CPlusPlus20) {
Expr *idx = ArgExprs[0];
if ((isa<BinaryOperator>(idx) && cast<BinaryOperator>(idx)->isCommaOp()) ||
(isa<CXXOperatorCallExpr>(idx) &&
cast<CXXOperatorCallExpr>(idx)->getOperator() == OO_Comma)) {
Diag(idx->getExprLoc(), diag::warn_deprecated_comma_subscript)
<< SourceRange(base->getBeginLoc(), rbLoc);
}
}
if (ArgExprs.size() == 1 &&
ArgExprs[0]->getType()->isNonOverloadPlaceholderType()) {
ExprResult result = CheckPlaceholderExpr(ArgExprs[0]);
if (result.isInvalid())
return ExprError();
ArgExprs[0] = result.get();
} else {
if (CheckArgsForPlaceholders(ArgExprs))
return ExprError();
}
// Build an unanalyzed expression if either operand is type-dependent.
if (getLangOpts().CPlusPlus && ArgExprs.size() == 1 &&
(base->isTypeDependent() ||
Expr::hasAnyTypeDependentArguments(ArgExprs)) &&
!isa<PackExpansionExpr>(ArgExprs[0])) {
return new (Context) ArraySubscriptExpr(
base, ArgExprs.front(),
getDependentArraySubscriptType(base, ArgExprs.front(), getASTContext()),
VK_LValue, OK_Ordinary, rbLoc);
}
// MSDN, property (C++)
// https://msdn.microsoft.com/en-us/library/yhfk0thd(v=vs.120).aspx
// This attribute can also be used in the declaration of an empty array in a
// class or structure definition. For example:
// __declspec(property(get=GetX, put=PutX)) int x[];
// The above statement indicates that x[] can be used with one or more array
// indices. In this case, i=p->x[a][b] will be turned into i=p->GetX(a, b),
// and p->x[a][b] = i will be turned into p->PutX(a, b, i);
if (IsMSPropertySubscript) {
assert(ArgExprs.size() == 1);
// Build MS property subscript expression if base is MS property reference
// or MS property subscript.
return new (Context)
MSPropertySubscriptExpr(base, ArgExprs.front(), Context.PseudoObjectTy,
VK_LValue, OK_Ordinary, rbLoc);
}
// Use C++ overloaded-operator rules if either operand has record
// type. The spec says to do this if either type is *overloadable*,
// but enum types can't declare subscript operators or conversion
// operators, so there's nothing interesting for overload resolution
// to do if there aren't any record types involved.
//
// ObjC pointers have their own subscripting logic that is not tied
// to overload resolution and so should not take this path.
if (getLangOpts().CPlusPlus && !base->getType()->isObjCObjectPointerType() &&
((base->getType()->isRecordType() ||
(ArgExprs.size() != 1 || isa<PackExpansionExpr>(ArgExprs[0]) ||
ArgExprs[0]->getType()->isRecordType())))) {
return CreateOverloadedArraySubscriptExpr(lbLoc, rbLoc, base, ArgExprs);
}
ExprResult Res =
CreateBuiltinArraySubscriptExpr(base, lbLoc, ArgExprs.front(), rbLoc);
if (!Res.isInvalid() && isa<ArraySubscriptExpr>(Res.get()))
CheckSubscriptAccessOfNoDeref(cast<ArraySubscriptExpr>(Res.get()));
return Res;
}
ExprResult Sema::tryConvertExprToType(Expr *E, QualType Ty) {
InitializedEntity Entity = InitializedEntity::InitializeTemporary(Ty);
InitializationKind Kind =
InitializationKind::CreateCopy(E->getBeginLoc(), SourceLocation());
InitializationSequence InitSeq(*this, Entity, Kind, E);
return InitSeq.Perform(*this, Entity, Kind, E);
}
ExprResult Sema::CreateBuiltinMatrixSubscriptExpr(Expr *Base, Expr *RowIdx,
Expr *ColumnIdx,
SourceLocation RBLoc) {
ExprResult BaseR = CheckPlaceholderExpr(Base);
if (BaseR.isInvalid())
return BaseR;
Base = BaseR.get();
ExprResult RowR = CheckPlaceholderExpr(RowIdx);
if (RowR.isInvalid())
return RowR;
RowIdx = RowR.get();
if (!ColumnIdx)
return new (Context) MatrixSubscriptExpr(
Base, RowIdx, ColumnIdx, Context.IncompleteMatrixIdxTy, RBLoc);
// Build an unanalyzed expression if any of the operands is type-dependent.
if (Base->isTypeDependent() || RowIdx->isTypeDependent() ||
ColumnIdx->isTypeDependent())
return new (Context) MatrixSubscriptExpr(Base, RowIdx, ColumnIdx,
Context.DependentTy, RBLoc);
ExprResult ColumnR = CheckPlaceholderExpr(ColumnIdx);
if (ColumnR.isInvalid())
return ColumnR;
ColumnIdx = ColumnR.get();
// Check that IndexExpr is an integer expression. If it is a constant
// expression, check that it is less than Dim (= the number of elements in the
// corresponding dimension).
auto IsIndexValid = [&](Expr *IndexExpr, unsigned Dim,
bool IsColumnIdx) -> Expr * {
if (!IndexExpr->getType()->isIntegerType() &&
!IndexExpr->isTypeDependent()) {
Diag(IndexExpr->getBeginLoc(), diag::err_matrix_index_not_integer)
<< IsColumnIdx;
return nullptr;
}
if (std::optional<llvm::APSInt> Idx =
IndexExpr->getIntegerConstantExpr(Context)) {
if ((*Idx < 0 || *Idx >= Dim)) {
Diag(IndexExpr->getBeginLoc(), diag::err_matrix_index_outside_range)
<< IsColumnIdx << Dim;
return nullptr;
}
}
ExprResult ConvExpr =
tryConvertExprToType(IndexExpr, Context.getSizeType());
assert(!ConvExpr.isInvalid() &&
"should be able to convert any integer type to size type");
return ConvExpr.get();
};
auto *MTy = Base->getType()->getAs<ConstantMatrixType>();
RowIdx = IsIndexValid(RowIdx, MTy->getNumRows(), false);
ColumnIdx = IsIndexValid(ColumnIdx, MTy->getNumColumns(), true);
if (!RowIdx || !ColumnIdx)
return ExprError();
return new (Context) MatrixSubscriptExpr(Base, RowIdx, ColumnIdx,
MTy->getElementType(), RBLoc);
}
void Sema::CheckAddressOfNoDeref(const Expr *E) {
ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
const Expr *StrippedExpr = E->IgnoreParenImpCasts();
// For expressions like `&(*s).b`, the base is recorded and what should be
// checked.
const MemberExpr *Member = nullptr;
while ((Member = dyn_cast<MemberExpr>(StrippedExpr)) && !Member->isArrow())
StrippedExpr = Member->getBase()->IgnoreParenImpCasts();
LastRecord.PossibleDerefs.erase(StrippedExpr);
}
void Sema::CheckSubscriptAccessOfNoDeref(const ArraySubscriptExpr *E) {
if (isUnevaluatedContext())
return;
QualType ResultTy = E->getType();
ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
// Bail if the element is an array since it is not memory access.
if (isa<ArrayType>(ResultTy))
return;
if (ResultTy->hasAttr(attr::NoDeref)) {
LastRecord.PossibleDerefs.insert(E);
return;
}
// Check if the base type is a pointer to a member access of a struct
// marked with noderef.
const Expr *Base = E->getBase();
QualType BaseTy = Base->getType();
if (!(isa<ArrayType>(BaseTy) || isa<PointerType>(BaseTy)))
// Not a pointer access
return;
const MemberExpr *Member = nullptr;
while ((Member = dyn_cast<MemberExpr>(Base->IgnoreParenCasts())) &&
Member->isArrow())
Base = Member->getBase();
if (const auto *Ptr = dyn_cast<PointerType>(Base->getType())) {
if (Ptr->getPointeeType()->hasAttr(attr::NoDeref))
LastRecord.PossibleDerefs.insert(E);
}
}
ExprResult Sema::ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
Expr *LowerBound,
SourceLocation ColonLocFirst,
SourceLocation ColonLocSecond,
Expr *Length, Expr *Stride,
SourceLocation RBLoc) {
if (Base->hasPlaceholderType() &&
!Base->hasPlaceholderType(BuiltinType::OMPArraySection)) {
ExprResult Result = CheckPlaceholderExpr(Base);
if (Result.isInvalid())
return ExprError();
Base = Result.get();
}
if (LowerBound && LowerBound->getType()->isNonOverloadPlaceholderType()) {
ExprResult Result = CheckPlaceholderExpr(LowerBound);
if (Result.isInvalid())
return ExprError();
Result = DefaultLvalueConversion(Result.get());
if (Result.isInvalid())
return ExprError();
LowerBound = Result.get();
}
if (Length && Length->getType()->isNonOverloadPlaceholderType()) {
ExprResult Result = CheckPlaceholderExpr(Length);
if (Result.isInvalid())
return ExprError();
Result = DefaultLvalueConversion(Result.get());
if (Result.isInvalid())
return ExprError();
Length = Result.get();
}
if (Stride && Stride->getType()->isNonOverloadPlaceholderType()) {
ExprResult Result = CheckPlaceholderExpr(Stride);
if (Result.isInvalid())
return ExprError();
Result = DefaultLvalueConversion(Result.get());
if (Result.isInvalid())
return ExprError();
Stride = Result.get();
}
// Build an unanalyzed expression if either operand is type-dependent.
if (Base->isTypeDependent() ||
(LowerBound &&
(LowerBound->isTypeDependent() || LowerBound->isValueDependent())) ||
(Length && (Length->isTypeDependent() || Length->isValueDependent())) ||
(Stride && (Stride->isTypeDependent() || Stride->isValueDependent()))) {
return new (Context) OMPArraySectionExpr(
Base, LowerBound, Length, Stride, Context.DependentTy, VK_LValue,
OK_Ordinary, ColonLocFirst, ColonLocSecond, RBLoc);
}
// Perform default conversions.
QualType OriginalTy = OMPArraySectionExpr::getBaseOriginalType(Base);
QualType ResultTy;
if (OriginalTy->isAnyPointerType()) {
ResultTy = OriginalTy->getPointeeType();
} else if (OriginalTy->isArrayType()) {
ResultTy = OriginalTy->getAsArrayTypeUnsafe()->getElementType();
} else {
return ExprError(
Diag(Base->getExprLoc(), diag::err_omp_typecheck_section_value)
<< Base->getSourceRange());
}
// C99 6.5.2.1p1
if (LowerBound) {
auto Res = PerformOpenMPImplicitIntegerConversion(LowerBound->getExprLoc(),
LowerBound);
if (Res.isInvalid())
return ExprError(Diag(LowerBound->getExprLoc(),
diag::err_omp_typecheck_section_not_integer)
<< 0 << LowerBound->getSourceRange());
LowerBound = Res.get();
if (LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
Diag(LowerBound->getExprLoc(), diag::warn_omp_section_is_char)
<< 0 << LowerBound->getSourceRange();
}
if (Length) {
auto Res =
PerformOpenMPImplicitIntegerConversion(Length->getExprLoc(), Length);
if (Res.isInvalid())
return ExprError(Diag(Length->getExprLoc(),
diag::err_omp_typecheck_section_not_integer)
<< 1 << Length->getSourceRange());
Length = Res.get();
if (Length->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Length->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
Diag(Length->getExprLoc(), diag::warn_omp_section_is_char)
<< 1 << Length->getSourceRange();
}
if (Stride) {
ExprResult Res =
PerformOpenMPImplicitIntegerConversion(Stride->getExprLoc(), Stride);
if (Res.isInvalid())
return ExprError(Diag(Stride->getExprLoc(),
diag::err_omp_typecheck_section_not_integer)
<< 1 << Stride->getSourceRange());
Stride = Res.get();
if (Stride->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Stride->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
Diag(Stride->getExprLoc(), diag::warn_omp_section_is_char)
<< 1 << Stride->getSourceRange();
}
// C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
// C++ [expr.sub]p1: The type "T" shall be a completely-defined object
// type. Note that functions are not objects, and that (in C99 parlance)
// incomplete types are not object types.
if (ResultTy->isFunctionType()) {
Diag(Base->getExprLoc(), diag::err_omp_section_function_type)
<< ResultTy << Base->getSourceRange();
return ExprError();
}
if (RequireCompleteType(Base->getExprLoc(), ResultTy,
diag::err_omp_section_incomplete_type, Base))
return ExprError();
if (LowerBound && !OriginalTy->isAnyPointerType()) {
Expr::EvalResult Result;
if (LowerBound->EvaluateAsInt(Result, Context)) {
// OpenMP 5.0, [2.1.5 Array Sections]
// The array section must be a subset of the original array.
llvm::APSInt LowerBoundValue = Result.Val.getInt();
if (LowerBoundValue.isNegative()) {
Diag(LowerBound->getExprLoc(), diag::err_omp_section_not_subset_of_array)
<< LowerBound->getSourceRange();
return ExprError();
}
}
}
if (Length) {
Expr::EvalResult Result;
if (Length->EvaluateAsInt(Result, Context)) {
// OpenMP 5.0, [2.1.5 Array Sections]
// The length must evaluate to non-negative integers.
llvm::APSInt LengthValue = Result.Val.getInt();
if (LengthValue.isNegative()) {
Diag(Length->getExprLoc(), diag::err_omp_section_length_negative)
<< toString(LengthValue, /*Radix=*/10, /*Signed=*/true)
<< Length->getSourceRange();
return ExprError();
}
}
} else if (ColonLocFirst.isValid() &&
(OriginalTy.isNull() || (!OriginalTy->isConstantArrayType() &&
!OriginalTy->isVariableArrayType()))) {
// OpenMP 5.0, [2.1.5 Array Sections]
// When the size of the array dimension is not known, the length must be
// specified explicitly.
Diag(ColonLocFirst, diag::err_omp_section_length_undefined)
<< (!OriginalTy.isNull() && OriginalTy->isArrayType());
return ExprError();
}
if (Stride) {
Expr::EvalResult Result;
if (Stride->EvaluateAsInt(Result, Context)) {
// OpenMP 5.0, [2.1.5 Array Sections]
// The stride must evaluate to a positive integer.
llvm::APSInt StrideValue = Result.Val.getInt();
if (!StrideValue.isStrictlyPositive()) {
Diag(Stride->getExprLoc(), diag::err_omp_section_stride_non_positive)
<< toString(StrideValue, /*Radix=*/10, /*Signed=*/true)
<< Stride->getSourceRange();
return ExprError();
}
}
}
if (!Base->hasPlaceholderType(BuiltinType::OMPArraySection)) {
ExprResult Result = DefaultFunctionArrayLvalueConversion(Base);
if (Result.isInvalid())
return ExprError();
Base = Result.get();
}
return new (Context) OMPArraySectionExpr(
Base, LowerBound, Length, Stride, Context.OMPArraySectionTy, VK_LValue,
OK_Ordinary, ColonLocFirst, ColonLocSecond, RBLoc);
}
ExprResult Sema::ActOnOMPArrayShapingExpr(Expr *Base, SourceLocation LParenLoc,
SourceLocation RParenLoc,
ArrayRef<Expr *> Dims,
ArrayRef<SourceRange> Brackets) {
if (Base->hasPlaceholderType()) {
ExprResult Result = CheckPlaceholderExpr(Base);
if (Result.isInvalid())
return ExprError();
Result = DefaultLvalueConversion(Result.get());
if (Result.isInvalid())
return ExprError();
Base = Result.get();
}
QualType BaseTy = Base->getType();
// Delay analysis of the types/expressions if instantiation/specialization is
// required.
if (!BaseTy->isPointerType() && Base->isTypeDependent())
return OMPArrayShapingExpr::Create(Context, Context.DependentTy, Base,
LParenLoc, RParenLoc, Dims, Brackets);
if (!BaseTy->isPointerType() ||
(!Base->isTypeDependent() &&
BaseTy->getPointeeType()->isIncompleteType()))
return ExprError(Diag(Base->getExprLoc(),
diag::err_omp_non_pointer_type_array_shaping_base)
<< Base->getSourceRange());
SmallVector<Expr *, 4> NewDims;
bool ErrorFound = false;
for (Expr *Dim : Dims) {
if (Dim->hasPlaceholderType()) {
ExprResult Result = CheckPlaceholderExpr(Dim);
if (Result.isInvalid()) {
ErrorFound = true;
continue;
}
Result = DefaultLvalueConversion(Result.get());
if (Result.isInvalid()) {
ErrorFound = true;
continue;
}
Dim = Result.get();
}
if (!Dim->isTypeDependent()) {
ExprResult Result =
PerformOpenMPImplicitIntegerConversion(Dim->getExprLoc(), Dim);
if (Result.isInvalid()) {
ErrorFound = true;
Diag(Dim->getExprLoc(), diag::err_omp_typecheck_shaping_not_integer)
<< Dim->getSourceRange();
continue;
}
Dim = Result.get();
Expr::EvalResult EvResult;
if (!Dim->isValueDependent() && Dim->EvaluateAsInt(EvResult, Context)) {
// OpenMP 5.0, [2.1.4 Array Shaping]
// Each si is an integral type expression that must evaluate to a
// positive integer.
llvm::APSInt Value = EvResult.Val.getInt();
if (!Value.isStrictlyPositive()) {
Diag(Dim->getExprLoc(), diag::err_omp_shaping_dimension_not_positive)
<< toString(Value, /*Radix=*/10, /*Signed=*/true)
<< Dim->getSourceRange();
ErrorFound = true;
continue;
}
}
}
NewDims.push_back(Dim);
}
if (ErrorFound)
return ExprError();
return OMPArrayShapingExpr::Create(Context, Context.OMPArrayShapingTy, Base,
LParenLoc, RParenLoc, NewDims, Brackets);
}
ExprResult Sema::ActOnOMPIteratorExpr(Scope *S, SourceLocation IteratorKwLoc,
SourceLocation LLoc, SourceLocation RLoc,
ArrayRef<OMPIteratorData> Data) {
SmallVector<OMPIteratorExpr::IteratorDefinition, 4> ID;
bool IsCorrect = true;
for (const OMPIteratorData &D : Data) {
TypeSourceInfo *TInfo = nullptr;
SourceLocation StartLoc;
QualType DeclTy;
if (!D.Type.getAsOpaquePtr()) {
// OpenMP 5.0, 2.1.6 Iterators
// In an iterator-specifier, if the iterator-type is not specified then
// the type of that iterator is of int type.
DeclTy = Context.IntTy;
StartLoc = D.DeclIdentLoc;
} else {
DeclTy = GetTypeFromParser(D.Type, &TInfo);
StartLoc = TInfo->getTypeLoc().getBeginLoc();
}
bool IsDeclTyDependent = DeclTy->isDependentType() ||
DeclTy->containsUnexpandedParameterPack() ||
DeclTy->isInstantiationDependentType();
if (!IsDeclTyDependent) {
if (!DeclTy->isIntegralType(Context) && !DeclTy->isAnyPointerType()) {
// OpenMP 5.0, 2.1.6 Iterators, Restrictions, C/C++
// The iterator-type must be an integral or pointer type.
Diag(StartLoc, diag::err_omp_iterator_not_integral_or_pointer)
<< DeclTy;
IsCorrect = false;
continue;
}
if (DeclTy.isConstant(Context)) {
// OpenMP 5.0, 2.1.6 Iterators, Restrictions, C/C++
// The iterator-type must not be const qualified.
Diag(StartLoc, diag::err_omp_iterator_not_integral_or_pointer)
<< DeclTy;
IsCorrect = false;
continue;
}
}
// Iterator declaration.
assert(D.DeclIdent && "Identifier expected.");
// Always try to create iterator declarator to avoid extra error messages
// about unknown declarations use.
auto *VD = VarDecl::Create(Context, CurContext, StartLoc, D.DeclIdentLoc,
D.DeclIdent, DeclTy, TInfo, SC_None);
VD->setImplicit();
if (S) {
// Check for conflicting previous declaration.
DeclarationNameInfo NameInfo(VD->getDeclName(), D.DeclIdentLoc);
LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
ForVisibleRedeclaration);
Previous.suppressDiagnostics();
LookupName(Previous, S);
FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage=*/false,
/*AllowInlineNamespace=*/false);
if (!Previous.empty()) {
NamedDecl *Old = Previous.getRepresentativeDecl();
Diag(D.DeclIdentLoc, diag::err_redefinition) << VD->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
} else {
PushOnScopeChains(VD, S);
}
} else {
CurContext->addDecl(VD);
}
/// Act on the iterator variable declaration.
ActOnOpenMPIteratorVarDecl(VD);
Expr *Begin = D.Range.Begin;
if (!IsDeclTyDependent && Begin && !Begin->isTypeDependent()) {
ExprResult BeginRes =
PerformImplicitConversion(Begin, DeclTy, AA_Converting);
Begin = BeginRes.get();
}
Expr *End = D.Range.End;
if (!IsDeclTyDependent && End && !End->isTypeDependent()) {
ExprResult EndRes = PerformImplicitConversion(End, DeclTy, AA_Converting);
End = EndRes.get();
}
Expr *Step = D.Range.Step;
if (!IsDeclTyDependent && Step && !Step->isTypeDependent()) {
if (!Step->getType()->isIntegralType(Context)) {
Diag(Step->getExprLoc(), diag::err_omp_iterator_step_not_integral)
<< Step << Step->getSourceRange();
IsCorrect = false;
continue;
}
std::optional<llvm::APSInt> Result =
Step->getIntegerConstantExpr(Context);
// OpenMP 5.0, 2.1.6 Iterators, Restrictions
// If the step expression of a range-specification equals zero, the
// behavior is unspecified.
if (Result && Result->isZero()) {
Diag(Step->getExprLoc(), diag::err_omp_iterator_step_constant_zero)
<< Step << Step->getSourceRange();
IsCorrect = false;
continue;
}
}
if (!Begin || !End || !IsCorrect) {
IsCorrect = false;
continue;
}
OMPIteratorExpr::IteratorDefinition &IDElem = ID.emplace_back();
IDElem.IteratorDecl = VD;
IDElem.AssignmentLoc = D.AssignLoc;
IDElem.Range.Begin = Begin;
IDElem.Range.End = End;
IDElem.Range.Step = Step;
IDElem.ColonLoc = D.ColonLoc;
IDElem.SecondColonLoc = D.SecColonLoc;
}
if (!IsCorrect) {
// Invalidate all created iterator declarations if error is found.
for (const OMPIteratorExpr::IteratorDefinition &D : ID) {
if (Decl *ID = D.IteratorDecl)
ID->setInvalidDecl();
}
return ExprError();
}
SmallVector<OMPIteratorHelperData, 4> Helpers;
if (!CurContext->isDependentContext()) {
// Build number of ityeration for each iteration range.
// Ni = ((Stepi > 0) ? ((Endi + Stepi -1 - Begini)/Stepi) :
// ((Begini-Stepi-1-Endi) / -Stepi);
for (OMPIteratorExpr::IteratorDefinition &D : ID) {
// (Endi - Begini)
ExprResult Res = CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, D.Range.End,
D.Range.Begin);
if(!Res.isUsable()) {
IsCorrect = false;
continue;
}
ExprResult St, St1;
if (D.Range.Step) {
St = D.Range.Step;
// (Endi - Begini) + Stepi
Res = CreateBuiltinBinOp(D.AssignmentLoc, BO_Add, Res.get(), St.get());
if (!Res.isUsable()) {
IsCorrect = false;
continue;
}
// (Endi - Begini) + Stepi - 1
Res =
CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, Res.get(),
ActOnIntegerConstant(D.AssignmentLoc, 1).get());
if (!Res.isUsable()) {
IsCorrect = false;
continue;
}
// ((Endi - Begini) + Stepi - 1) / Stepi
Res = CreateBuiltinBinOp(D.AssignmentLoc, BO_Div, Res.get(), St.get());
if (!Res.isUsable()) {
IsCorrect = false;
continue;
}
St1 = CreateBuiltinUnaryOp(D.AssignmentLoc, UO_Minus, D.Range.Step);
// (Begini - Endi)
ExprResult Res1 = CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub,
D.Range.Begin, D.Range.End);
if (!Res1.isUsable()) {
IsCorrect = false;
continue;
}
// (Begini - Endi) - Stepi
Res1 =
CreateBuiltinBinOp(D.AssignmentLoc, BO_Add, Res1.get(), St1.get());
if (!Res1.isUsable()) {
IsCorrect = false;
continue;
}
// (Begini - Endi) - Stepi - 1
Res1 =
CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, Res1.get(),
ActOnIntegerConstant(D.AssignmentLoc, 1).get());
if (!Res1.isUsable()) {
IsCorrect = false;
continue;
}
// ((Begini - Endi) - Stepi - 1) / (-Stepi)
Res1 =
CreateBuiltinBinOp(D.AssignmentLoc, BO_Div, Res1.get(), St1.get());
if (!Res1.isUsable()) {
IsCorrect = false;
continue;
}
// Stepi > 0.
ExprResult CmpRes =
CreateBuiltinBinOp(D.AssignmentLoc, BO_GT, D.Range.Step,
ActOnIntegerConstant(D.AssignmentLoc, 0).get());
if (!CmpRes.isUsable()) {
IsCorrect = false;
continue;
}
Res = ActOnConditionalOp(D.AssignmentLoc, D.AssignmentLoc, CmpRes.get(),
Res.get(), Res1.get());
if (!Res.isUsable()) {
IsCorrect = false;
continue;
}
}
Res = ActOnFinishFullExpr(Res.get(), /*DiscardedValue=*/false);
if (!Res.isUsable()) {
IsCorrect = false;
continue;
}
// Build counter update.
// Build counter.
auto *CounterVD =
VarDecl::Create(Context, CurContext, D.IteratorDecl->getBeginLoc(),
D.IteratorDecl->getBeginLoc(), nullptr,
Res.get()->getType(), nullptr, SC_None);
CounterVD->setImplicit();
ExprResult RefRes =
BuildDeclRefExpr(CounterVD, CounterVD->getType(), VK_LValue,
D.IteratorDecl->getBeginLoc());
// Build counter update.
// I = Begini + counter * Stepi;
ExprResult UpdateRes;
if (D.Range.Step) {
UpdateRes = CreateBuiltinBinOp(
D.AssignmentLoc, BO_Mul,
DefaultLvalueConversion(RefRes.get()).get(), St.get());
} else {
UpdateRes = DefaultLvalueConversion(RefRes.get());
}
if (!UpdateRes.isUsable()) {
IsCorrect = false;
continue;
}
UpdateRes = CreateBuiltinBinOp(D.AssignmentLoc, BO_Add, D.Range.Begin,
UpdateRes.get());
if (!UpdateRes.isUsable()) {
IsCorrect = false;
continue;
}
ExprResult VDRes =
BuildDeclRefExpr(cast<VarDecl>(D.IteratorDecl),
cast<VarDecl>(D.IteratorDecl)->getType(), VK_LValue,
D.IteratorDecl->getBeginLoc());
UpdateRes = CreateBuiltinBinOp(D.AssignmentLoc, BO_Assign, VDRes.get(),
UpdateRes.get());
if (!UpdateRes.isUsable()) {
IsCorrect = false;
continue;
}
UpdateRes =
ActOnFinishFullExpr(UpdateRes.get(), /*DiscardedValue=*/true);
if (!UpdateRes.isUsable()) {
IsCorrect = false;
continue;
}
ExprResult CounterUpdateRes =
CreateBuiltinUnaryOp(D.AssignmentLoc, UO_PreInc, RefRes.get());
if (!CounterUpdateRes.isUsable()) {
IsCorrect = false;
continue;
}
CounterUpdateRes =
ActOnFinishFullExpr(CounterUpdateRes.get(), /*DiscardedValue=*/true);
if (!CounterUpdateRes.isUsable()) {
IsCorrect = false;
continue;
}
OMPIteratorHelperData &HD = Helpers.emplace_back();
HD.CounterVD = CounterVD;
HD.Upper = Res.get();
HD.Update = UpdateRes.get();
HD.CounterUpdate = CounterUpdateRes.get();
}
} else {
Helpers.assign(ID.size(), {});
}
if (!IsCorrect) {
// Invalidate all created iterator declarations if error is found.
for (const OMPIteratorExpr::IteratorDefinition &D : ID) {
if (Decl *ID = D.IteratorDecl)
ID->setInvalidDecl();
}
return ExprError();
}
return OMPIteratorExpr::Create(Context, Context.OMPIteratorTy, IteratorKwLoc,
LLoc, RLoc, ID, Helpers);
}
ExprResult
Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
Expr *Idx, SourceLocation RLoc) {
Expr *LHSExp = Base;
Expr *RHSExp = Idx;
ExprValueKind VK = VK_LValue;
ExprObjectKind OK = OK_Ordinary;
// Per C++ core issue 1213, the result is an xvalue if either operand is
// a non-lvalue array, and an lvalue otherwise.
if (getLangOpts().CPlusPlus11) {
for (auto *Op : {LHSExp, RHSExp}) {
Op = Op->IgnoreImplicit();
if (Op->getType()->isArrayType() && !Op->isLValue())
VK = VK_XValue;
}
}
// Perform default conversions.
if (!LHSExp->getType()->getAs<VectorType>()) {
ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
if (Result.isInvalid())
return ExprError();
LHSExp = Result.get();
}
ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
if (Result.isInvalid())
return ExprError();
RHSExp = Result.get();
QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
// C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
// to the expression *((e1)+(e2)). This means the array "Base" may actually be
// in the subscript position. As a result, we need to derive the array base
// and index from the expression types.
Expr *BaseExpr, *IndexExpr;
QualType ResultType;
if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
BaseExpr = LHSExp;
IndexExpr = RHSExp;
ResultType =
getDependentArraySubscriptType(LHSExp, RHSExp, getASTContext());
} else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
BaseExpr = LHSExp;
IndexExpr = RHSExp;
ResultType = PTy->getPointeeType();
} else if (const ObjCObjectPointerType *PTy =
LHSTy->getAs<ObjCObjectPointerType>()) {
BaseExpr = LHSExp;
IndexExpr = RHSExp;
// Use custom logic if this should be the pseudo-object subscript
// expression.
if (!LangOpts.isSubscriptPointerArithmetic())
return BuildObjCSubscriptExpression(RLoc, BaseExpr, IndexExpr, nullptr,
nullptr);
ResultType = PTy->getPointeeType();
} else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
// Handle the uncommon case of "123[Ptr]".
BaseExpr = RHSExp;
IndexExpr = LHSExp;
ResultType = PTy->getPointeeType();
} else if (const ObjCObjectPointerType *PTy =
RHSTy->getAs<ObjCObjectPointerType>()) {
// Handle the uncommon case of "123[Ptr]".
BaseExpr = RHSExp;
IndexExpr = LHSExp;
ResultType = PTy->getPointeeType();
if (!LangOpts.isSubscriptPointerArithmetic()) {
Diag(LLoc, diag::err_subscript_nonfragile_interface)
<< ResultType << BaseExpr->getSourceRange();
return ExprError();
}
} else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
BaseExpr = LHSExp; // vectors: V[123]
IndexExpr = RHSExp;
// We apply C++ DR1213 to vector subscripting too.
if (getLangOpts().CPlusPlus11 && LHSExp->isPRValue()) {
ExprResult Materialized = TemporaryMaterializationConversion(LHSExp);
if (Materialized.isInvalid())
return ExprError();
LHSExp = Materialized.get();
}
VK = LHSExp->getValueKind();
if (VK != VK_PRValue)
OK = OK_VectorComponent;
ResultType = VTy->getElementType();
QualType BaseType = BaseExpr->getType();
Qualifiers BaseQuals = BaseType.getQualifiers();
Qualifiers MemberQuals = ResultType.getQualifiers();
Qualifiers Combined = BaseQuals + MemberQuals;
if (Combined != MemberQuals)
ResultType = Context.getQualifiedType(ResultType, Combined);
} else if (LHSTy->isBuiltinType() &&
LHSTy->getAs<BuiltinType>()->isSveVLSBuiltinType()) {
const BuiltinType *BTy = LHSTy->getAs<BuiltinType>();
if (BTy->isSVEBool())
return ExprError(Diag(LLoc, diag::err_subscript_svbool_t)
<< LHSExp->getSourceRange() << RHSExp->getSourceRange());
BaseExpr = LHSExp;
IndexExpr = RHSExp;
if (getLangOpts().CPlusPlus11 && LHSExp->isPRValue()) {
ExprResult Materialized = TemporaryMaterializationConversion(LHSExp);
if (Materialized.isInvalid())
return ExprError();
LHSExp = Materialized.get();
}
VK = LHSExp->getValueKind();
if (VK != VK_PRValue)
OK = OK_VectorComponent;
ResultType = BTy->getSveEltType(Context);
QualType BaseType = BaseExpr->getType();
Qualifiers BaseQuals = BaseType.getQualifiers();
Qualifiers MemberQuals = ResultType.getQualifiers();
Qualifiers Combined = BaseQuals + MemberQuals;
if (Combined != MemberQuals)
ResultType = Context.getQualifiedType(ResultType, Combined);
} else if (LHSTy->isArrayType()) {
// If we see an array that wasn't promoted by
// DefaultFunctionArrayLvalueConversion, it must be an array that
// wasn't promoted because of the C90 rule that doesn't
// allow promoting non-lvalue arrays. Warn, then
// force the promotion here.
Diag(LHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue)
<< LHSExp->getSourceRange();
LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
CK_ArrayToPointerDecay).get();
LHSTy = LHSExp->getType();
BaseExpr = LHSExp;
IndexExpr = RHSExp;
ResultType = LHSTy->castAs<PointerType>()->getPointeeType();
} else if (RHSTy->isArrayType()) {
// Same as previous, except for 123[f().a] case
Diag(RHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue)
<< RHSExp->getSourceRange();
RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
CK_ArrayToPointerDecay).get();
RHSTy = RHSExp->getType();
BaseExpr = RHSExp;
IndexExpr = LHSExp;
ResultType = RHSTy->castAs<PointerType>()->getPointeeType();
} else {
return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
<< LHSExp->getSourceRange() << RHSExp->getSourceRange());
}
// C99 6.5.2.1p1
if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
<< IndexExpr->getSourceRange());
if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) &&
!IndexExpr->isTypeDependent()) {
std::optional<llvm::APSInt> IntegerContantExpr =
IndexExpr->getIntegerConstantExpr(getASTContext());
if (!IntegerContantExpr.has_value() ||
IntegerContantExpr.value().isNegative())
Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
}
// C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
// C++ [expr.sub]p1: The type "T" shall be a completely-defined object
// type. Note that Functions are not objects, and that (in C99 parlance)
// incomplete types are not object types.
if (ResultType->isFunctionType()) {
Diag(BaseExpr->getBeginLoc(), diag::err_subscript_function_type)
<< ResultType << BaseExpr->getSourceRange();
return ExprError();
}
if (ResultType->isVoidType() && !getLangOpts().CPlusPlus) {
// GNU extension: subscripting on pointer to void
Diag(LLoc, diag::ext_gnu_subscript_void_type)
<< BaseExpr->getSourceRange();
// C forbids expressions of unqualified void type from being l-values.
// See IsCForbiddenLValueType.
if (!ResultType.hasQualifiers())
VK = VK_PRValue;
} else if (!ResultType->isDependentType() &&
!ResultType.isWebAssemblyReferenceType() &&
RequireCompleteSizedType(
LLoc, ResultType,
diag::err_subscript_incomplete_or_sizeless_type, BaseExpr))
return ExprError();
assert(VK == VK_PRValue || LangOpts.CPlusPlus ||
!ResultType.isCForbiddenLValueType());
if (LHSExp->IgnoreParenImpCasts()->getType()->isVariablyModifiedType() &&
FunctionScopes.size() > 1) {
if (auto *TT =
LHSExp->IgnoreParenImpCasts()->getType()->getAs<TypedefType>()) {
for (auto I = FunctionScopes.rbegin(),
E = std::prev(FunctionScopes.rend());
I != E; ++I) {
auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
if (CSI == nullptr)
break;
DeclContext *DC = nullptr;
if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
DC = LSI->CallOperator;
else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
DC = CRSI->TheCapturedDecl;
else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
DC = BSI->TheDecl;
if (DC) {
if (DC->containsDecl(TT->getDecl()))
break;
captureVariablyModifiedType(
Context, LHSExp->IgnoreParenImpCasts()->getType(), CSI);
}
}
}
}
return new (Context)
ArraySubscriptExpr(LHSExp, RHSExp, ResultType, VK, OK, RLoc);
}
bool Sema::CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
ParmVarDecl *Param, Expr *RewrittenInit,
bool SkipImmediateInvocations) {
if (Param->hasUnparsedDefaultArg()) {
assert(!RewrittenInit && "Should not have a rewritten init expression yet");
// If we've already cleared out the location for the default argument,
// that means we're parsing it right now.
if (!UnparsedDefaultArgLocs.count(Param)) {
Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD;
Diag(CallLoc, diag::note_recursive_default_argument_used_here);
Param->setInvalidDecl();
return true;
}
Diag(CallLoc, diag::err_use_of_default_argument_to_function_declared_later)
<< FD << cast<CXXRecordDecl>(FD->getDeclContext());
Diag(UnparsedDefaultArgLocs[Param],
diag::note_default_argument_declared_here);
return true;
}
if (Param->hasUninstantiatedDefaultArg()) {
assert(!RewrittenInit && "Should not have a rewitten init expression yet");
if (InstantiateDefaultArgument(CallLoc, FD, Param))
return true;
}
Expr *Init = RewrittenInit ? RewrittenInit : Param->getInit();
assert(Init && "default argument but no initializer?");
// If the default expression creates temporaries, we need to
// push them to the current stack of expression temporaries so they'll
// be properly destroyed.
// FIXME: We should really be rebuilding the default argument with new
// bound temporaries; see the comment in PR5810.
// We don't need to do that with block decls, though, because
// blocks in default argument expression can never capture anything.
if (auto *InitWithCleanup = dyn_cast<ExprWithCleanups>(Init)) {
// Set the "needs cleanups" bit regardless of whether there are
// any explicit objects.
Cleanup.setExprNeedsCleanups(InitWithCleanup->cleanupsHaveSideEffects());
// Append all the objects to the cleanup list. Right now, this
// should always be a no-op, because blocks in default argument
// expressions should never be able to capture anything.
assert(!InitWithCleanup->getNumObjects() &&
"default argument expression has capturing blocks?");
}
// C++ [expr.const]p15.1:
// An expression or conversion is in an immediate function context if it is
// potentially evaluated and [...] its innermost enclosing non-block scope
// is a function parameter scope of an immediate function.
EnterExpressionEvaluationContext EvalContext(
*this,
FD->isImmediateFunction()
? ExpressionEvaluationContext::ImmediateFunctionContext
: ExpressionEvaluationContext::PotentiallyEvaluated,
Param);
ExprEvalContexts.back().IsCurrentlyCheckingDefaultArgumentOrInitializer =
SkipImmediateInvocations;
runWithSufficientStackSpace(CallLoc, [&] {
MarkDeclarationsReferencedInExpr(Init, /*SkipLocalVariables=*/true);
});
return false;
}
struct ImmediateCallVisitor : public RecursiveASTVisitor<ImmediateCallVisitor> {
const ASTContext &Context;
ImmediateCallVisitor(const ASTContext &Ctx) : Context(Ctx) {}
bool HasImmediateCalls = false;
bool shouldVisitImplicitCode() const { return true; }
bool VisitCallExpr(CallExpr *E) {
if (const FunctionDecl *FD = E->getDirectCallee())
HasImmediateCalls |= FD->isImmediateFunction();
return RecursiveASTVisitor<ImmediateCallVisitor>::VisitStmt(E);
}
bool VisitCXXConstructExpr(CXXConstructExpr *E) {
if (const FunctionDecl *FD = E->getConstructor())
HasImmediateCalls |= FD->isImmediateFunction();
return RecursiveASTVisitor<ImmediateCallVisitor>::VisitStmt(E);
}
// SourceLocExpr are not immediate invocations
// but CXXDefaultInitExpr/CXXDefaultArgExpr containing a SourceLocExpr
// need to be rebuilt so that they refer to the correct SourceLocation and
// DeclContext.
bool VisitSourceLocExpr(SourceLocExpr *E) {
HasImmediateCalls = true;
return RecursiveASTVisitor<ImmediateCallVisitor>::VisitStmt(E);
}
// A nested lambda might have parameters with immediate invocations
// in their default arguments.
// The compound statement is not visited (as it does not constitute a
// subexpression).
// FIXME: We should consider visiting and transforming captures
// with init expressions.
bool VisitLambdaExpr(LambdaExpr *E) {
return VisitCXXMethodDecl(E->getCallOperator());
}
bool VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
return TraverseStmt(E->getExpr());
}
bool VisitCXXDefaultInitExpr(CXXDefaultInitExpr *E) {
return TraverseStmt(E->getExpr());
}
};
struct EnsureImmediateInvocationInDefaultArgs
: TreeTransform<EnsureImmediateInvocationInDefaultArgs> {
EnsureImmediateInvocationInDefaultArgs(Sema &SemaRef)
: TreeTransform(SemaRef) {}
// Lambda can only have immediate invocations in the default
// args of their parameters, which is transformed upon calling the closure.
// The body is not a subexpression, so we have nothing to do.
// FIXME: Immediate calls in capture initializers should be transformed.
ExprResult TransformLambdaExpr(LambdaExpr *E) { return E; }
ExprResult TransformBlockExpr(BlockExpr *E) { return E; }
// Make sure we don't rebuild the this pointer as it would
// cause it to incorrectly point it to the outermost class
// in the case of nested struct initialization.
ExprResult TransformCXXThisExpr(CXXThisExpr *E) { return E; }
};
ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
FunctionDecl *FD, ParmVarDecl *Param,
Expr *Init) {
assert(Param->hasDefaultArg() && "can't build nonexistent default arg");
bool NestedDefaultChecking = isCheckingDefaultArgumentOrInitializer();
bool InLifetimeExtendingContext = isInLifetimeExtendingContext();
std::optional<ExpressionEvaluationContextRecord::InitializationContext>
InitializationContext =
OutermostDeclarationWithDelayedImmediateInvocations();
if (!InitializationContext.has_value())
InitializationContext.emplace(CallLoc, Param, CurContext);
if (!Init && !Param->hasUnparsedDefaultArg()) {
// Mark that we are replacing a default argument first.
// If we are instantiating a template we won't have to
// retransform immediate calls.
// C++ [expr.const]p15.1:
// An expression or conversion is in an immediate function context if it
// is potentially evaluated and [...] its innermost enclosing non-block
// scope is a function parameter scope of an immediate function.
EnterExpressionEvaluationContext EvalContext(
*this,
FD->isImmediateFunction()
? ExpressionEvaluationContext::ImmediateFunctionContext
: ExpressionEvaluationContext::PotentiallyEvaluated,
Param);
if (Param->hasUninstantiatedDefaultArg()) {
if (InstantiateDefaultArgument(CallLoc, FD, Param))
return ExprError();
}
// CWG2631
// An immediate invocation that is not evaluated where it appears is
// evaluated and checked for whether it is a constant expression at the
// point where the enclosing initializer is used in a function call.
ImmediateCallVisitor V(getASTContext());
if (!NestedDefaultChecking)
V.TraverseDecl(Param);
// Rewrite the call argument that was created from the corresponding
// parameter's default argument.
if (V.HasImmediateCalls || InLifetimeExtendingContext) {
if (V.HasImmediateCalls)
ExprEvalContexts.back().DelayedDefaultInitializationContext = {
CallLoc, Param, CurContext};
// Pass down lifetime extending flag, and collect temporaries in
// CreateMaterializeTemporaryExpr when we rewrite the call argument.
keepInLifetimeExtendingContext();
keepInMaterializeTemporaryObjectContext();
EnsureImmediateInvocationInDefaultArgs Immediate(*this);
ExprResult Res;
runWithSufficientStackSpace(CallLoc, [&] {
Res = Immediate.TransformInitializer(Param->getInit(),
/*NotCopy=*/false);
});
if (Res.isInvalid())
return ExprError();
Res = ConvertParamDefaultArgument(Param, Res.get(),
Res.get()->getBeginLoc());
if (Res.isInvalid())
return ExprError();
Init = Res.get();
}
}
if (CheckCXXDefaultArgExpr(
CallLoc, FD, Param, Init,
/*SkipImmediateInvocations=*/NestedDefaultChecking))
return ExprError();
return CXXDefaultArgExpr::Create(Context, InitializationContext->Loc, Param,
Init, InitializationContext->Context);
}
ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
assert(Field->hasInClassInitializer());
// If we might have already tried and failed to instantiate, don't try again.
if (Field->isInvalidDecl())
return ExprError();
CXXThisScopeRAII This(*this, Field->getParent(), Qualifiers());
auto *ParentRD = cast<CXXRecordDecl>(Field->getParent());
std::optional<ExpressionEvaluationContextRecord::InitializationContext>
InitializationContext =
OutermostDeclarationWithDelayedImmediateInvocations();
if (!InitializationContext.has_value())
InitializationContext.emplace(Loc, Field, CurContext);
Expr *Init = nullptr;
bool NestedDefaultChecking = isCheckingDefaultArgumentOrInitializer();
EnterExpressionEvaluationContext EvalContext(
*this, ExpressionEvaluationContext::PotentiallyEvaluated, Field);
if (!Field->getInClassInitializer()) {
// Maybe we haven't instantiated the in-class initializer. Go check the
// pattern FieldDecl to see if it has one.
if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) {
CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern();
DeclContext::lookup_result Lookup =
ClassPattern->lookup(Field->getDeclName());
FieldDecl *Pattern = nullptr;
for (auto *L : Lookup) {
if ((Pattern = dyn_cast<FieldDecl>(L)))
break;
}
assert(Pattern && "We must have set the Pattern!");
if (!Pattern->hasInClassInitializer() ||
InstantiateInClassInitializer(Loc, Field, Pattern,
getTemplateInstantiationArgs(Field))) {
Field->setInvalidDecl();
return ExprError();
}
}
}
// CWG2631
// An immediate invocation that is not evaluated where it appears is
// evaluated and checked for whether it is a constant expression at the
// point where the enclosing initializer is used in a [...] a constructor
// definition, or an aggregate initialization.
ImmediateCallVisitor V(getASTContext());
if (!NestedDefaultChecking)
V.TraverseDecl(Field);
if (V.HasImmediateCalls) {
ExprEvalContexts.back().DelayedDefaultInitializationContext = {Loc, Field,
CurContext};
ExprEvalContexts.back().IsCurrentlyCheckingDefaultArgumentOrInitializer =
NestedDefaultChecking;
EnsureImmediateInvocationInDefaultArgs Immediate(*this);
ExprResult Res;
runWithSufficientStackSpace(Loc, [&] {
Res = Immediate.TransformInitializer(Field->getInClassInitializer(),
/*CXXDirectInit=*/false);
});
if (!Res.isInvalid())
Res = ConvertMemberDefaultInitExpression(Field, Res.get(), Loc);
if (Res.isInvalid()) {
Field->setInvalidDecl();
return ExprError();
}
Init = Res.get();
}
if (Field->getInClassInitializer()) {
Expr *E = Init ? Init : Field->getInClassInitializer();
if (!NestedDefaultChecking)
runWithSufficientStackSpace(Loc, [&] {
MarkDeclarationsReferencedInExpr(E, /*SkipLocalVariables=*/false);
});
// C++11 [class.base.init]p7:
// The initialization of each base and member constitutes a
// full-expression.
ExprResult Res = ActOnFinishFullExpr(E, /*DiscardedValue=*/false);
if (Res.isInvalid()) {
Field->setInvalidDecl();
return ExprError();
}
Init = Res.get();
return CXXDefaultInitExpr::Create(Context, InitializationContext->Loc,
Field, InitializationContext->Context,
Init);
}
// DR1351:
// If the brace-or-equal-initializer of a non-static data member
// invokes a defaulted default constructor of its class or of an
// enclosing class in a potentially evaluated subexpression, the
// program is ill-formed.
//
// This resolution is unworkable: the exception specification of the
// default constructor can be needed in an unevaluated context, in
// particular, in the operand of a noexcept-expression, and we can be
// unable to compute an exception specification for an enclosed class.
//
// Any attempt to resolve the exception specification of a defaulted default
// constructor before the initializer is lexically complete will ultimately
// come here at which point we can diagnose it.
RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext();
Diag(Loc, diag::err_default_member_initializer_not_yet_parsed)
<< OutermostClass << Field;
Diag(Field->getEndLoc(),
diag::note_default_member_initializer_not_yet_parsed);
// Recover by marking the field invalid, unless we're in a SFINAE context.
if (!isSFINAEContext())
Field->setInvalidDecl();
return ExprError();
}
Sema::VariadicCallType
Sema::getVariadicCallType(FunctionDecl *FDecl, const FunctionProtoType *Proto,
Expr *Fn) {
if (Proto && Proto->isVariadic()) {
if (isa_and_nonnull<CXXConstructorDecl>(FDecl))
return VariadicConstructor;
else if (Fn && Fn->getType()->isBlockPointerType())
return VariadicBlock;
else if (FDecl) {
if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
if (Method->isInstance())
return VariadicMethod;
} else if (Fn && Fn->getType() == Context.BoundMemberTy)
return VariadicMethod;
return VariadicFunction;
}
return VariadicDoesNotApply;
}
namespace {
class FunctionCallCCC final : public FunctionCallFilterCCC {
public:
FunctionCallCCC(Sema &SemaRef, const IdentifierInfo *FuncName,
unsigned NumArgs, MemberExpr *ME)
: FunctionCallFilterCCC(SemaRef, NumArgs, false, ME),
FunctionName(FuncName) {}
bool ValidateCandidate(const TypoCorrection &candidate) override {
if (!candidate.getCorrectionSpecifier() ||
candidate.getCorrectionAsIdentifierInfo() != FunctionName) {
return false;
}
return FunctionCallFilterCCC::ValidateCandidate(candidate);
}
std::unique_ptr<CorrectionCandidateCallback> clone() override {
return std::make_unique<FunctionCallCCC>(*this);
}
private:
const IdentifierInfo *const FunctionName;
};
}
static TypoCorrection TryTypoCorrectionForCall(Sema &S, Expr *Fn,
FunctionDecl *FDecl,
ArrayRef<Expr *> Args) {
MemberExpr *ME = dyn_cast<MemberExpr>(Fn);
DeclarationName FuncName = FDecl->getDeclName();
SourceLocation NameLoc = ME ? ME->getMemberLoc() : Fn->getBeginLoc();
FunctionCallCCC CCC(S, FuncName.getAsIdentifierInfo(), Args.size(), ME);
if (TypoCorrection Corrected = S.CorrectTypo(
DeclarationNameInfo(FuncName, NameLoc), Sema::LookupOrdinaryName,
S.getScopeForContext(S.CurContext), nullptr, CCC,
Sema::CTK_ErrorRecovery)) {
if (NamedDecl *ND = Corrected.getFoundDecl()) {
if (Corrected.isOverloaded()) {
OverloadCandidateSet OCS(NameLoc, OverloadCandidateSet::CSK_Normal);
OverloadCandidateSet::iterator Best;
for (NamedDecl *CD : Corrected) {
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
S.AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none), Args,
OCS);
}
switch (OCS.BestViableFunction(S, NameLoc, Best)) {
case OR_Success:
ND = Best->FoundDecl;
Corrected.setCorrectionDecl(ND);
break;
default:
break;
}
}
ND = ND->getUnderlyingDecl();
if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND))
return Corrected;
}
}
return TypoCorrection();
}
/// ConvertArgumentsForCall - Converts the arguments specified in
/// Args/NumArgs to the parameter types of the function FDecl with
/// function prototype Proto. Call is the call expression itself, and
/// Fn is the function expression. For a C++ member function, this
/// routine does not attempt to convert the object argument. Returns
/// true if the call is ill-formed.
bool
Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
FunctionDecl *FDecl,
const FunctionProtoType *Proto,
ArrayRef<Expr *> Args,
SourceLocation RParenLoc,
bool IsExecConfig) {
// Bail out early if calling a builtin with custom typechecking.
if (FDecl)
if (unsigned ID = FDecl->getBuiltinID())
if (Context.BuiltinInfo.hasCustomTypechecking(ID))
return false;
// C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
// assignment, to the types of the corresponding parameter, ...
bool HasExplicitObjectParameter =
FDecl && FDecl->hasCXXExplicitFunctionObjectParameter();
unsigned ExplicitObjectParameterOffset = HasExplicitObjectParameter ? 1 : 0;
unsigned NumParams = Proto->getNumParams();
bool Invalid = false;
unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumParams;
unsigned FnKind = Fn->getType()->isBlockPointerType()
? 1 /* block */
: (IsExecConfig ? 3 /* kernel function (exec config) */
: 0 /* function */);
// If too few arguments are available (and we don't have default
// arguments for the remaining parameters), don't make the call.
if (Args.size() < NumParams) {
if (Args.size() < MinArgs) {
TypoCorrection TC;
if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
unsigned diag_id =
MinArgs == NumParams && !Proto->isVariadic()
? diag::err_typecheck_call_too_few_args_suggest
: diag::err_typecheck_call_too_few_args_at_least_suggest;
diagnoseTypo(
TC, PDiag(diag_id)
<< FnKind << MinArgs - ExplicitObjectParameterOffset
<< static_cast<unsigned>(Args.size()) -
ExplicitObjectParameterOffset
<< HasExplicitObjectParameter << TC.getCorrectionRange());
} else if (MinArgs - ExplicitObjectParameterOffset == 1 && FDecl &&
FDecl->getParamDecl(ExplicitObjectParameterOffset)
->getDeclName())
Diag(RParenLoc,
MinArgs == NumParams && !Proto->isVariadic()
? diag::err_typecheck_call_too_few_args_one
: diag::err_typecheck_call_too_few_args_at_least_one)
<< FnKind << FDecl->getParamDecl(ExplicitObjectParameterOffset)
<< HasExplicitObjectParameter << Fn->getSourceRange();
else
Diag(RParenLoc, MinArgs == NumParams && !Proto->isVariadic()
? diag::err_typecheck_call_too_few_args
: diag::err_typecheck_call_too_few_args_at_least)
<< FnKind << MinArgs - ExplicitObjectParameterOffset
<< static_cast<unsigned>(Args.size()) -
ExplicitObjectParameterOffset
<< HasExplicitObjectParameter << Fn->getSourceRange();
// Emit the location of the prototype.
if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Diag(FDecl->getLocation(), diag::note_callee_decl)
<< FDecl << FDecl->getParametersSourceRange();
return true;
}
// We reserve space for the default arguments when we create
// the call expression, before calling ConvertArgumentsForCall.
assert((Call->getNumArgs() == NumParams) &&
"We should have reserved space for the default arguments before!");
}
// If too many are passed and not variadic, error on the extras and drop
// them.
if (Args.size() > NumParams) {
if (!Proto->isVariadic()) {
TypoCorrection TC;
if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
unsigned diag_id =
MinArgs == NumParams && !Proto->isVariadic()
? diag::err_typecheck_call_too_many_args_suggest
: diag::err_typecheck_call_too_many_args_at_most_suggest;
diagnoseTypo(
TC, PDiag(diag_id)
<< FnKind << NumParams - ExplicitObjectParameterOffset
<< static_cast<unsigned>(Args.size()) -
ExplicitObjectParameterOffset
<< HasExplicitObjectParameter << TC.getCorrectionRange());
} else if (NumParams - ExplicitObjectParameterOffset == 1 && FDecl &&
FDecl->getParamDecl(ExplicitObjectParameterOffset)
->getDeclName())
Diag(Args[NumParams]->getBeginLoc(),
MinArgs == NumParams
? diag::err_typecheck_call_too_many_args_one
: diag::err_typecheck_call_too_many_args_at_most_one)
<< FnKind << FDecl->getParamDecl(ExplicitObjectParameterOffset)
<< static_cast<unsigned>(Args.size()) -
ExplicitObjectParameterOffset
<< HasExplicitObjectParameter << Fn->getSourceRange()
<< SourceRange(Args[NumParams]->getBeginLoc(),
Args.back()->getEndLoc());
else
Diag(Args[NumParams]->getBeginLoc(),
MinArgs == NumParams
? diag::err_typecheck_call_too_many_args
: diag::err_typecheck_call_too_many_args_at_most)
<< FnKind << NumParams - ExplicitObjectParameterOffset
<< static_cast<unsigned>(Args.size()) -
ExplicitObjectParameterOffset
<< HasExplicitObjectParameter << Fn->getSourceRange()
<< SourceRange(Args[NumParams]->getBeginLoc(),
Args.back()->getEndLoc());
// Emit the location of the prototype.
if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
Diag(FDecl->getLocation(), diag::note_callee_decl)
<< FDecl << FDecl->getParametersSourceRange();
// This deletes the extra arguments.
Call->shrinkNumArgs(NumParams);
return true;
}
}
SmallVector<Expr *, 8> AllArgs;
VariadicCallType CallType = getVariadicCallType(FDecl, Proto, Fn);
Invalid = GatherArgumentsForCall(Call->getBeginLoc(), FDecl, Proto, 0, Args,
AllArgs, CallType);
if (Invalid)
return true;
unsigned TotalNumArgs = AllArgs.size();
for (unsigned i = 0; i < TotalNumArgs; ++i)
Call->setArg(i, AllArgs[i]);
Call->computeDependence();
return false;
}
bool Sema::GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
const FunctionProtoType *Proto,
unsigned FirstParam, ArrayRef<Expr *> Args,
SmallVectorImpl<Expr *> &AllArgs,
VariadicCallType CallType, bool AllowExplicit,
bool IsListInitialization) {
unsigned NumParams = Proto->getNumParams();
bool Invalid = false;
size_t ArgIx = 0;
// Continue to check argument types (even if we have too few/many args).
for (unsigned i = FirstParam; i < NumParams; i++) {
QualType ProtoArgType = Proto->getParamType(i);
Expr *Arg;
ParmVarDecl *Param = FDecl ? FDecl->getParamDecl(i) : nullptr;
if (ArgIx < Args.size()) {
Arg = Args[ArgIx++];
if (RequireCompleteType(Arg->getBeginLoc(), ProtoArgType,
diag::err_call_incomplete_argument, Arg))
return true;
// Strip the unbridged-cast placeholder expression off, if applicable.
bool CFAudited = false;
if (Arg->getType() == Context.ARCUnbridgedCastTy &&
FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
(!Param || !Param->hasAttr<CFConsumedAttr>()))
Arg = stripARCUnbridgedCast(Arg);
else if (getLangOpts().ObjCAutoRefCount &&
FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
(!Param || !Param->hasAttr<CFConsumedAttr>()))
CFAudited = true;
if (Proto->getExtParameterInfo(i).isNoEscape() &&
ProtoArgType->isBlockPointerType())
if (auto *BE = dyn_cast<BlockExpr>(Arg->IgnoreParenNoopCasts(Context)))
BE->getBlockDecl()->setDoesNotEscape();
InitializedEntity Entity =
Param ? InitializedEntity::InitializeParameter(Context, Param,
ProtoArgType)
: InitializedEntity::InitializeParameter(
Context, ProtoArgType, Proto->isParamConsumed(i));
// Remember that parameter belongs to a CF audited API.
if (CFAudited)
Entity.setParameterCFAudited();
ExprResult ArgE = PerformCopyInitialization(
Entity, SourceLocation(), Arg, IsListInitialization, AllowExplicit);
if (ArgE.isInvalid())
return true;
Arg = ArgE.getAs<Expr>();
} else {
assert(Param && "can't use default arguments without a known callee");
ExprResult ArgExpr = BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
if (ArgExpr.isInvalid())
return true;
Arg = ArgExpr.getAs<Expr>();
}
// Check for array bounds violations for each argument to the call. This
// check only triggers warnings when the argument isn't a more complex Expr
// with its own checking, such as a BinaryOperator.
CheckArrayAccess(Arg);
// Check for violations of C99 static array rules (C99 6.7.5.3p7).
CheckStaticArrayArgument(CallLoc, Param, Arg);
AllArgs.push_back(Arg);
}
// If this is a variadic call, handle args passed through "...".
if (CallType != VariadicDoesNotApply) {
// Assume that extern "C" functions with variadic arguments that
// return __unknown_anytype aren't *really* variadic.
if (Proto->getReturnType() == Context.UnknownAnyTy && FDecl &&
FDecl->isExternC()) {
for (Expr *A : Args.slice(ArgIx)) {
QualType paramType; // ignored
ExprResult arg = checkUnknownAnyArg(CallLoc, A, paramType);
Invalid |= arg.isInvalid();
AllArgs.push_back(arg.get());
}
// Otherwise do argument promotion, (C99 6.5.2.2p7).
} else {
for (Expr *A : Args.slice(ArgIx)) {
ExprResult Arg = DefaultVariadicArgumentPromotion(A, CallType, FDecl);
Invalid |= Arg.isInvalid();
AllArgs.push_back(Arg.get());
}
}
// Check for array bounds violations.
for (Expr *A : Args.slice(ArgIx))
CheckArrayAccess(A);
}
return Invalid;
}
static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
if (DecayedTypeLoc DTL = TL.getAs<DecayedTypeLoc>())
TL = DTL.getOriginalLoc();
if (ArrayTypeLoc ATL = TL.getAs<ArrayTypeLoc>())
S.Diag(PVD->getLocation(), diag::note_callee_static_array)
<< ATL.getLocalSourceRange();
}
/// CheckStaticArrayArgument - If the given argument corresponds to a static
/// array parameter, check that it is non-null, and that if it is formed by
/// array-to-pointer decay, the underlying array is sufficiently large.
///
/// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
/// array type derivation, then for each call to the function, the value of the
/// corresponding actual argument shall provide access to the first element of
/// an array with at least as many elements as specified by the size expression.
void
Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
ParmVarDecl *Param,
const Expr *ArgExpr) {
// Static array parameters are not supported in C++.
if (!Param || getLangOpts().CPlusPlus)
return;
QualType OrigTy = Param->getOriginalType();
const ArrayType *AT = Context.getAsArrayType(OrigTy);
if (!AT || AT->getSizeModifier() != ArraySizeModifier::Static)
return;
if (ArgExpr->isNullPointerConstant(Context,
Expr::NPC_NeverValueDependent)) {
Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
DiagnoseCalleeStaticArrayParam(*this, Param);
return;
}
const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
if (!CAT)
return;
const ConstantArrayType *ArgCAT =
Context.getAsConstantArrayType(ArgExpr->IgnoreParenCasts()->getType());
if (!ArgCAT)
return;
if (getASTContext().hasSameUnqualifiedType(CAT->getElementType(),
ArgCAT->getElementType())) {
if (ArgCAT->getSize().ult(CAT->getSize())) {
Diag(CallLoc, diag::warn_static_array_too_small)
<< ArgExpr->getSourceRange()
<< (unsigned)ArgCAT->getSize().getZExtValue()
<< (unsigned)CAT->getSize().getZExtValue() << 0;
DiagnoseCalleeStaticArrayParam(*this, Param);
}
return;
}
std::optional<CharUnits> ArgSize =
getASTContext().getTypeSizeInCharsIfKnown(ArgCAT);
std::optional<CharUnits> ParmSize =
getASTContext().getTypeSizeInCharsIfKnown(CAT);
if (ArgSize && ParmSize && *ArgSize < *ParmSize) {
Diag(CallLoc, diag::warn_static_array_too_small)
<< ArgExpr->getSourceRange() << (unsigned)ArgSize->getQuantity()
<< (unsigned)ParmSize->getQuantity() << 1;
DiagnoseCalleeStaticArrayParam(*this, Param);
}
}
/// Given a function expression of unknown-any type, try to rebuild it
/// to have a function type.
static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
/// Is the given type a placeholder that we need to lower out
/// immediately during argument processing?
static bool isPlaceholderToRemoveAsArg(QualType type) {
// Placeholders are never sugared.
const BuiltinType *placeholder = dyn_cast<BuiltinType>(type);
if (!placeholder) return false;
switch (placeholder->getKind()) {
// Ignore all the non-placeholder types.
#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id:
#include "clang/Basic/OpenCLImageTypes.def"
#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id:
#include "clang/Basic/OpenCLExtensionTypes.def"
// In practice we'll never use this, since all SVE types are sugared
// via TypedefTypes rather than exposed directly as BuiltinTypes.
#define SVE_TYPE(Name, Id, SingletonId) \
case BuiltinType::Id:
#include "clang/Basic/AArch64SVEACLETypes.def"
#define PPC_VECTOR_TYPE(Name, Id, Size) \
case BuiltinType::Id:
#include "clang/Basic/PPCTypes.def"
#define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
#include "clang/Basic/RISCVVTypes.def"
#define WASM_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
#include "clang/Basic/WebAssemblyReferenceTypes.def"
#define PLACEHOLDER_TYPE(ID, SINGLETON_ID)
#define BUILTIN_TYPE(ID, SINGLETON_ID) case BuiltinType::ID:
#include "clang/AST/BuiltinTypes.def"
return false;
// We cannot lower out overload sets; they might validly be resolved
// by the call machinery.
case BuiltinType::Overload:
return false;
// Unbridged casts in ARC can be handled in some call positions and
// should be left in place.
case BuiltinType::ARCUnbridgedCast:
return false;
// Pseudo-objects should be converted as soon as possible.
case BuiltinType::PseudoObject:
return true;
// The debugger mode could theoretically but currently does not try
// to resolve unknown-typed arguments based on known parameter types.
case BuiltinType::UnknownAny:
return true;
// These are always invalid as call arguments and should be reported.
case BuiltinType::BoundMember:
case BuiltinType::BuiltinFn:
case BuiltinType::IncompleteMatrixIdx:
case BuiltinType::OMPArraySection:
case BuiltinType::OMPArrayShaping:
case BuiltinType::OMPIterator:
return true;
}
llvm_unreachable("bad builtin type kind");
}
bool Sema::CheckArgsForPlaceholders(MultiExprArg args) {
// Apply this processing to all the arguments at once instead of
// dying at the first failure.
bool hasInvalid = false;
for (size_t i = 0, e = args.size(); i != e; i++) {
if (isPlaceholderToRemoveAsArg(args[i]->getType())) {
ExprResult result = CheckPlaceholderExpr(args[i]);
if (result.isInvalid()) hasInvalid = true;
else args[i] = result.get();
}
}
return hasInvalid;
}
/// If a builtin function has a pointer argument with no explicit address
/// space, then it should be able to accept a pointer to any address
/// space as input. In order to do this, we need to replace the
/// standard builtin declaration with one that uses the same address space
/// as the call.
///
/// \returns nullptr If this builtin is not a candidate for a rewrite i.e.
/// it does not contain any pointer arguments without
/// an address space qualifer. Otherwise the rewritten
/// FunctionDecl is returned.
/// TODO: Handle pointer return types.
static FunctionDecl *rewriteBuiltinFunctionDecl(Sema *Sema, ASTContext &Context,
FunctionDecl *FDecl,
MultiExprArg ArgExprs) {
QualType DeclType = FDecl->getType();
const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(DeclType);
if (!Context.BuiltinInfo.hasPtrArgsOrResult(FDecl->getBuiltinID()) || !FT ||
ArgExprs.size() < FT->getNumParams())
return nullptr;
bool NeedsNewDecl = false;
unsigned i = 0;
SmallVector<QualType, 8> OverloadParams;
for (QualType ParamType : FT->param_types()) {
// Convert array arguments to pointer to simplify type lookup.
ExprResult ArgRes =
Sema->DefaultFunctionArrayLvalueConversion(ArgExprs[i++]);
if (ArgRes.isInvalid())
return nullptr;
Expr *Arg = ArgRes.get();
QualType ArgType = Arg->getType();
if (!ParamType->isPointerType() || ParamType.hasAddressSpace() ||
!ArgType->isPointerType() ||
!ArgType->getPointeeType().hasAddressSpace() ||
isPtrSizeAddressSpace(ArgType->getPointeeType().getAddressSpace())) {
OverloadParams.push_back(ParamType);
continue;
}
QualType PointeeType = ParamType->getPointeeType();
if (PointeeType.hasAddressSpace())
continue;
NeedsNewDecl = true;
LangAS AS = ArgType->getPointeeType().getAddressSpace();
PointeeType = Context.getAddrSpaceQualType(PointeeType, AS);
OverloadParams.push_back(Context.getPointerType(PointeeType));
}
if (!NeedsNewDecl)
return nullptr;
FunctionProtoType::ExtProtoInfo EPI;
EPI.Variadic = FT->isVariadic();
QualType OverloadTy = Context.getFunctionType(FT->getReturnType(),
OverloadParams, EPI);
DeclContext *Parent = FDecl->getParent();
FunctionDecl *OverloadDecl = FunctionDecl::Create(
Context, Parent, FDecl->getLocation(), FDecl->getLocation(),
FDecl->getIdentifier(), OverloadTy,
/*TInfo=*/nullptr, SC_Extern, Sema->getCurFPFeatures().isFPConstrained(),
false,
/*hasPrototype=*/true);
SmallVector<ParmVarDecl*, 16> Params;
FT = cast<FunctionProtoType>(OverloadTy);
for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
QualType ParamType = FT->getParamType(i);
ParmVarDecl *Parm =
ParmVarDecl::Create(Context, OverloadDecl, SourceLocation(),
SourceLocation(), nullptr, ParamType,
/*TInfo=*/nullptr, SC_None, nullptr);
Parm->setScopeInfo(0, i);
Params.push_back(Parm);
}
OverloadDecl->setParams(Params);
Sema->mergeDeclAttributes(OverloadDecl, FDecl);
return OverloadDecl;
}
static void checkDirectCallValidity(Sema &S, const Expr *Fn,
FunctionDecl *Callee,
MultiExprArg ArgExprs) {
// `Callee` (when called with ArgExprs) may be ill-formed. enable_if (and
// similar attributes) really don't like it when functions are called with an
// invalid number of args.
if (S.TooManyArguments(Callee->getNumParams(), ArgExprs.size(),
/*PartialOverloading=*/false) &&
!Callee->isVariadic())
return;
if (Callee->getMinRequiredArguments() > ArgExprs.size())
return;
if (const EnableIfAttr *Attr =
S.CheckEnableIf(Callee, Fn->getBeginLoc(), ArgExprs, true)) {
S.Diag(Fn->getBeginLoc(),
isa<CXXMethodDecl>(Callee)
? diag::err_ovl_no_viable_member_function_in_call
: diag::err_ovl_no_viable_function_in_call)
<< Callee << Callee->getSourceRange();
S.Diag(Callee->getLocation(),
diag::note_ovl_candidate_disabled_by_function_cond_attr)
<< Attr->getCond()->getSourceRange() << Attr->getMessage();
return;
}
}
static bool enclosingClassIsRelatedToClassInWhichMembersWereFound(
const UnresolvedMemberExpr *const UME, Sema &S) {
const auto GetFunctionLevelDCIfCXXClass =
[](Sema &S) -> const CXXRecordDecl * {
const DeclContext *const DC = S.getFunctionLevelDeclContext();
if (!DC || !DC->getParent())
return nullptr;
// If the call to some member function was made from within a member
// function body 'M' return return 'M's parent.
if (const auto *MD = dyn_cast<CXXMethodDecl>(DC))
return MD->getParent()->getCanonicalDecl();
// else the call was made from within a default member initializer of a
// class, so return the class.
if (const auto *RD = dyn_cast<CXXRecordDecl>(DC))
return RD->getCanonicalDecl();
return nullptr;
};
// If our DeclContext is neither a member function nor a class (in the
// case of a lambda in a default member initializer), we can't have an
// enclosing 'this'.
const CXXRecordDecl *const CurParentClass = GetFunctionLevelDCIfCXXClass(S);
if (!CurParentClass)
return false;
// The naming class for implicit member functions call is the class in which
// name lookup starts.
const CXXRecordDecl *const NamingClass =
UME->getNamingClass()->getCanonicalDecl();
assert(NamingClass && "Must have naming class even for implicit access");
// If the unresolved member functions were found in a 'naming class' that is
// related (either the same or derived from) to the class that contains the
// member function that itself contained the implicit member access.
return CurParentClass == NamingClass ||
CurParentClass->isDerivedFrom(NamingClass);
}
static void
tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
Sema &S, const UnresolvedMemberExpr *const UME, SourceLocation CallLoc) {
if (!UME)
return;
LambdaScopeInfo *const CurLSI = S.getCurLambda();
// Only try and implicitly capture 'this' within a C++ Lambda if it hasn't
// already been captured, or if this is an implicit member function call (if
// it isn't, an attempt to capture 'this' should already have been made).
if (!CurLSI || CurLSI->ImpCaptureStyle == CurLSI->ImpCap_None ||
!UME->isImplicitAccess() || CurLSI->isCXXThisCaptured())
return;
// Check if the naming class in which the unresolved members were found is
// related (same as or is a base of) to the enclosing class.
if (!enclosingClassIsRelatedToClassInWhichMembersWereFound(UME, S))
return;
DeclContext *EnclosingFunctionCtx = S.CurContext->getParent()->getParent();
// If the enclosing function is not dependent, then this lambda is
// capture ready, so if we can capture this, do so.
if (!EnclosingFunctionCtx->isDependentContext()) {
// If the current lambda and all enclosing lambdas can capture 'this' -
// then go ahead and capture 'this' (since our unresolved overload set
// contains at least one non-static member function).
if (!S.CheckCXXThisCapture(CallLoc, /*Explcit*/ false, /*Diagnose*/ false))
S.CheckCXXThisCapture(CallLoc);
} else if (S.CurContext->isDependentContext()) {
// ... since this is an implicit member reference, that might potentially
// involve a 'this' capture, mark 'this' for potential capture in
// enclosing lambdas.
if (CurLSI->ImpCaptureStyle != CurLSI->ImpCap_None)
CurLSI->addPotentialThisCapture(CallLoc);
}
}
// Once a call is fully resolved, warn for unqualified calls to specific
// C++ standard functions, like move and forward.
static void DiagnosedUnqualifiedCallsToStdFunctions(Sema &S,
const CallExpr *Call) {
// We are only checking unary move and forward so exit early here.
if (Call->getNumArgs() != 1)
return;
const Expr *E = Call->getCallee()->IgnoreParenImpCasts();
if (!E || isa<UnresolvedLookupExpr>(E))
return;
const DeclRefExpr *DRE = dyn_cast_if_present<DeclRefExpr>(E);
if (!DRE || !DRE->getLocation().isValid())
return;
if (DRE->getQualifier())
return;
const FunctionDecl *FD = Call->getDirectCallee();
if (!FD)
return;
// Only warn for some functions deemed more frequent or problematic.
unsigned BuiltinID = FD->getBuiltinID();
if (BuiltinID != Builtin::BImove && BuiltinID != Builtin::BIforward)
return;
S.Diag(DRE->getLocation(), diag::warn_unqualified_call_to_std_cast_function)
<< FD->getQualifiedNameAsString()
<< FixItHint::CreateInsertion(DRE->getLocation(), "std::");
}
ExprResult Sema::ActOnCallExpr(Scope *Scope, Expr *Fn, SourceLocation LParenLoc,
MultiExprArg ArgExprs, SourceLocation RParenLoc,
Expr *ExecConfig) {
ExprResult Call =
BuildCallExpr(Scope, Fn, LParenLoc, ArgExprs, RParenLoc, ExecConfig,
/*IsExecConfig=*/false, /*AllowRecovery=*/true);
if (Call.isInvalid())
return Call;
// Diagnose uses of the C++20 "ADL-only template-id call" feature in earlier
// language modes.
if (const auto *ULE = dyn_cast<UnresolvedLookupExpr>(Fn);
ULE && ULE->hasExplicitTemplateArgs() &&
ULE->decls_begin() == ULE->decls_end()) {
Diag(Fn->getExprLoc(), getLangOpts().CPlusPlus20
? diag::warn_cxx17_compat_adl_only_template_id
: diag::ext_adl_only_template_id)
<< ULE->getName();
}
if (LangOpts.OpenMP)
Call = ActOnOpenMPCall(Call, Scope, LParenLoc, ArgExprs, RParenLoc,
ExecConfig);
if (LangOpts.CPlusPlus) {
if (const auto *CE = dyn_cast<CallExpr>(Call.get()))
DiagnosedUnqualifiedCallsToStdFunctions(*this, CE);
}
return Call;
}
/// BuildCallExpr - Handle a call to Fn with the specified array of arguments.
/// This provides the location of the left/right parens and a list of comma
/// locations.
ExprResult Sema::BuildCallExpr(Scope *Scope, Expr *Fn, SourceLocation LParenLoc,
MultiExprArg ArgExprs, SourceLocation RParenLoc,
Expr *ExecConfig, bool IsExecConfig,
bool AllowRecovery) {
// Since this might be a postfix expression, get rid of ParenListExprs.
ExprResult Result = MaybeConvertParenListExprToParenExpr(Scope, Fn);
if (Result.isInvalid()) return ExprError();
Fn = Result.get();
if (CheckArgsForPlaceholders(ArgExprs))
return ExprError();
if (getLangOpts().CPlusPlus) {
// If this is a pseudo-destructor expression, build the call immediately.
if (isa<CXXPseudoDestructorExpr>(Fn)) {
if (!ArgExprs.empty()) {
// Pseudo-destructor calls should not have any arguments.
Diag(Fn->getBeginLoc(), diag::err_pseudo_dtor_call_with_args)
<< FixItHint::CreateRemoval(
SourceRange(ArgExprs.front()->getBeginLoc(),
ArgExprs.back()->getEndLoc()));
}
return CallExpr::Create(Context, Fn, /*Args=*/{}, Context.VoidTy,
VK_PRValue, RParenLoc, CurFPFeatureOverrides());
}
if (Fn->getType() == Context.PseudoObjectTy) {
ExprResult result = CheckPlaceholderExpr(Fn);
if (result.isInvalid()) return ExprError();
Fn = result.get();
}
// Determine whether this is a dependent call inside a C++ template,
// in which case we won't do any semantic analysis now.
if (Fn->isTypeDependent() || Expr::hasAnyTypeDependentArguments(ArgExprs)) {
if (ExecConfig) {
return CUDAKernelCallExpr::Create(Context, Fn,
cast<CallExpr>(ExecConfig), ArgExprs,
Context.DependentTy, VK_PRValue,
RParenLoc, CurFPFeatureOverrides());
} else {
tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
*this, dyn_cast<UnresolvedMemberExpr>(Fn->IgnoreParens()),
Fn->getBeginLoc());
return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
VK_PRValue, RParenLoc, CurFPFeatureOverrides());
}
}
// Determine whether this is a call to an object (C++ [over.call.object]).
if (Fn->getType()->isRecordType())
return BuildCallToObjectOfClassType(Scope, Fn, LParenLoc, ArgExprs,
RParenLoc);
if (Fn->getType() == Context.UnknownAnyTy) {
ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
if (result.isInvalid()) return ExprError();
Fn = result.get();
}
if (Fn->getType() == Context.BoundMemberTy) {
return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
RParenLoc, ExecConfig, IsExecConfig,
AllowRecovery);
}
}
// Check for overloaded calls. This can happen even in C due to extensions.
if (Fn->getType() == Context.OverloadTy) {
OverloadExpr::FindResult find = OverloadExpr::find(Fn);
// We aren't supposed to apply this logic if there's an '&' involved.
if (!find.HasFormOfMemberPointer) {
if (Expr::hasAnyTypeDependentArguments(ArgExprs))
return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
VK_PRValue, RParenLoc, CurFPFeatureOverrides());
OverloadExpr *ovl = find.Expression;
if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(ovl))
return BuildOverloadedCallExpr(
Scope, Fn, ULE, LParenLoc, ArgExprs, RParenLoc, ExecConfig,
/*AllowTypoCorrection=*/true, find.IsAddressOfOperand);
return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
RParenLoc, ExecConfig, IsExecConfig,
AllowRecovery);
}
}
// If we're directly calling a function, get the appropriate declaration.
if (Fn->getType() == Context.UnknownAnyTy) {
ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
if (result.isInvalid()) return ExprError();
Fn = result.get();
}
Expr *NakedFn = Fn->IgnoreParens();
bool CallingNDeclIndirectly = false;
NamedDecl *NDecl = nullptr;
if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn)) {
if (UnOp->getOpcode() == UO_AddrOf) {
CallingNDeclIndirectly = true;
NakedFn = UnOp->getSubExpr()->IgnoreParens();
}
}
if (auto *DRE = dyn_cast<DeclRefExpr>(NakedFn)) {
NDecl = DRE->getDecl();
FunctionDecl *FDecl = dyn_cast<FunctionDecl>(NDecl);
if (FDecl && FDecl->getBuiltinID()) {
// Rewrite the function decl for this builtin by replacing parameters
// with no explicit address space with the address space of the arguments
// in ArgExprs.
if ((FDecl =
rewriteBuiltinFunctionDecl(this, Context, FDecl, ArgExprs))) {
NDecl = FDecl;
Fn = DeclRefExpr::Create(
Context, FDecl->getQualifierLoc(), SourceLocation(), FDecl, false,
SourceLocation(), FDecl->getType(), Fn->getValueKind(), FDecl,
nullptr, DRE->isNonOdrUse());
}
}
} else if (auto *ME = dyn_cast<MemberExpr>(NakedFn))
NDecl = ME->getMemberDecl();
if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(NDecl)) {
if (CallingNDeclIndirectly && !checkAddressOfFunctionIsAvailable(
FD, /*Complain=*/true, Fn->getBeginLoc()))
return ExprError();
checkDirectCallValidity(*this, Fn, FD, ArgExprs);
// If this expression is a call to a builtin function in HIP device
// compilation, allow a pointer-type argument to default address space to be
// passed as a pointer-type parameter to a non-default address space.
// If Arg is declared in the default address space and Param is declared
// in a non-default address space, perform an implicit address space cast to
// the parameter type.
if (getLangOpts().HIP && getLangOpts().CUDAIsDevice && FD &&
FD->getBuiltinID()) {
for (unsigned Idx = 0; Idx < FD->param_size(); ++Idx) {
ParmVarDecl *Param = FD->getParamDecl(Idx);
if (!ArgExprs[Idx] || !Param || !Param->getType()->isPointerType() ||
!ArgExprs[Idx]->getType()->isPointerType())
continue;
auto ParamAS = Param->getType()->getPointeeType().getAddressSpace();
auto ArgTy = ArgExprs[Idx]->getType();
auto ArgPtTy = ArgTy->getPointeeType();
auto ArgAS = ArgPtTy.getAddressSpace();
// Add address space cast if target address spaces are different
bool NeedImplicitASC =
ParamAS != LangAS::Default && // Pointer params in generic AS don't need special handling.
( ArgAS == LangAS::Default || // We do allow implicit conversion from generic AS
// or from specific AS which has target AS matching that of Param.
getASTContext().getTargetAddressSpace(ArgAS) == getASTContext().getTargetAddressSpace(ParamAS));
if (!NeedImplicitASC)
continue;
// First, ensure that the Arg is an RValue.
if (ArgExprs[Idx]->isGLValue()) {
ArgExprs[Idx] = ImplicitCastExpr::Create(
Context, ArgExprs[Idx]->getType(), CK_NoOp, ArgExprs[Idx],
nullptr, VK_PRValue, FPOptionsOverride());
}
// Construct a new arg type with address space of Param
Qualifiers ArgPtQuals = ArgPtTy.getQualifiers();
ArgPtQuals.setAddressSpace(ParamAS);
auto NewArgPtTy =
Context.getQualifiedType(ArgPtTy.getUnqualifiedType(), ArgPtQuals);
auto NewArgTy =
Context.getQualifiedType(Context.getPointerType(NewArgPtTy),
ArgTy.getQualifiers());
// Finally perform an implicit address space cast
ArgExprs[Idx] = ImpCastExprToType(ArgExprs[Idx], NewArgTy,
CK_AddressSpaceConversion)
.get();
}
}
}
if (Context.isDependenceAllowed() &&
(Fn->isTypeDependent() || Expr::hasAnyTypeDependentArguments(ArgExprs))) {
assert(!getLangOpts().CPlusPlus);
assert((Fn->containsErrors() ||
llvm::any_of(ArgExprs,
[](clang::Expr *E) { return E->containsErrors(); })) &&
"should only occur in error-recovery path.");
return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
VK_PRValue, RParenLoc, CurFPFeatureOverrides());
}
return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, ArgExprs, RParenLoc,
ExecConfig, IsExecConfig);
}
/// BuildBuiltinCallExpr - Create a call to a builtin function specified by Id
// with the specified CallArgs
Expr *Sema::BuildBuiltinCallExpr(SourceLocation Loc, Builtin::ID Id,
MultiExprArg CallArgs) {
StringRef Name = Context.BuiltinInfo.getName(Id);
LookupResult R(*this, &Context.Idents.get(Name), Loc,
Sema::LookupOrdinaryName);
LookupName(R, TUScope, /*AllowBuiltinCreation=*/true);
auto *BuiltInDecl = R.getAsSingle<FunctionDecl>();
assert(BuiltInDecl && "failed to find builtin declaration");
ExprResult DeclRef =
BuildDeclRefExpr(BuiltInDecl, BuiltInDecl->getType(), VK_LValue, Loc);
assert(DeclRef.isUsable() && "Builtin reference cannot fail");
ExprResult Call =
BuildCallExpr(/*Scope=*/nullptr, DeclRef.get(), Loc, CallArgs, Loc);
assert(!Call.isInvalid() && "Call to builtin cannot fail!");
return Call.get();
}
/// Parse a __builtin_astype expression.
///
/// __builtin_astype( value, dst type )
///
ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
SourceLocation BuiltinLoc,
SourceLocation RParenLoc) {
QualType DstTy = GetTypeFromParser(ParsedDestTy);
return BuildAsTypeExpr(E, DstTy, BuiltinLoc, RParenLoc);
}
/// Create a new AsTypeExpr node (bitcast) from the arguments.
ExprResult Sema::BuildAsTypeExpr(Expr *E, QualType DestTy,
SourceLocation BuiltinLoc,
SourceLocation RParenLoc) {
ExprValueKind VK = VK_PRValue;
ExprObjectKind OK = OK_Ordinary;
QualType SrcTy = E->getType();
if (!SrcTy->isDependentType() &&
Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy))
return ExprError(
Diag(BuiltinLoc, diag::err_invalid_astype_of_different_size)
<< DestTy << SrcTy << E->getSourceRange());
return new (Context) AsTypeExpr(E, DestTy, VK, OK, BuiltinLoc, RParenLoc);
}
/// ActOnConvertVectorExpr - create a new convert-vector expression from the
/// provided arguments.
///
/// __builtin_convertvector( value, dst type )
///
ExprResult Sema::ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
SourceLocation BuiltinLoc,
SourceLocation RParenLoc) {
TypeSourceInfo *TInfo;
GetTypeFromParser(ParsedDestTy, &TInfo);
return SemaConvertVectorExpr(E, TInfo, BuiltinLoc, RParenLoc);
}
/// BuildResolvedCallExpr - Build a call to a resolved expression,
/// i.e. an expression not of \p OverloadTy. The expression should
/// unary-convert to an expression of function-pointer or
/// block-pointer type.
///
/// \param NDecl the declaration being called, if available
ExprResult Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
SourceLocation LParenLoc,
ArrayRef<Expr *> Args,
SourceLocation RParenLoc, Expr *Config,
bool IsExecConfig, ADLCallKind UsesADL) {
FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
// Functions with 'interrupt' attribute cannot be called directly.
if (FDecl && FDecl->hasAttr<AnyX86InterruptAttr>()) {
Diag(Fn->getExprLoc(), diag::err_anyx86_interrupt_called);
return ExprError();
}
// Interrupt handlers don't save off the VFP regs automatically on ARM,
// so there's some risk when calling out to non-interrupt handler functions
// that the callee might not preserve them. This is easy to diagnose here,
// but can be very challenging to debug.
// Likewise, X86 interrupt handlers may only call routines with attribute
// no_caller_saved_registers since there is no efficient way to
// save and restore the non-GPR state.
if (auto *Caller = getCurFunctionDecl()) {
if (Caller->hasAttr<ARMInterruptAttr>()) {
bool VFP = Context.getTargetInfo().hasFeature("vfp");
if (VFP && (!FDecl || !FDecl->hasAttr<ARMInterruptAttr>())) {
Diag(Fn->getExprLoc(), diag::warn_arm_interrupt_calling_convention);
if (FDecl)
Diag(FDecl->getLocation(), diag::note_callee_decl) << FDecl;
}
}
if (Caller->hasAttr<AnyX86InterruptAttr>() ||
Caller->hasAttr<AnyX86NoCallerSavedRegistersAttr>()) {
const TargetInfo &TI = Context.getTargetInfo();
bool HasNonGPRRegisters =
TI.hasFeature("sse") || TI.hasFeature("x87") || TI.hasFeature("mmx");
if (HasNonGPRRegisters &&
(!FDecl || !FDecl->hasAttr<AnyX86NoCallerSavedRegistersAttr>())) {
Diag(Fn->getExprLoc(), diag::warn_anyx86_excessive_regsave)
<< (Caller->hasAttr<AnyX86InterruptAttr>() ? 0 : 1);
if (FDecl)
Diag(FDecl->getLocation(), diag::note_callee_decl) << FDecl;
}
}
}
// Promote the function operand.
// We special-case function promotion here because we only allow promoting
// builtin functions to function pointers in the callee of a call.
ExprResult Result;
QualType ResultTy;
if (BuiltinID &&
Fn->getType()->isSpecificBuiltinType(BuiltinType::BuiltinFn)) {
// Extract the return type from the (builtin) function pointer type.
// FIXME Several builtins still have setType in
// Sema::CheckBuiltinFunctionCall. One should review their definitions in
// Builtins.td to ensure they are correct before removing setType calls.
QualType FnPtrTy = Context.getPointerType(FDecl->getType());
Result = ImpCastExprToType(Fn, FnPtrTy, CK_BuiltinFnToFnPtr).get();
ResultTy = FDecl->getCallResultType();
} else {
Result = CallExprUnaryConversions(Fn);
ResultTy = Context.BoolTy;
}
if (Result.isInvalid())
return ExprError();
Fn = Result.get();
// Check for a valid function type, but only if it is not a builtin which
// requires custom type checking. These will be handled by
// CheckBuiltinFunctionCall below just after creation of the call expression.
const FunctionType *FuncT = nullptr;
if (!BuiltinID || !Context.BuiltinInfo.hasCustomTypechecking(BuiltinID)) {
retry:
if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
// C99 6.5.2.2p1 - "The expression that denotes the called function shall
// have type pointer to function".
FuncT = PT->getPointeeType()->getAs<FunctionType>();
if (!FuncT)
return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
<< Fn->getType() << Fn->getSourceRange());
} else if (const BlockPointerType *BPT =
Fn->getType()->getAs<BlockPointerType>()) {
FuncT = BPT->getPointeeType()->castAs<FunctionType>();
} else {
// Handle calls to expressions of unknown-any type.
if (Fn->getType() == Context.UnknownAnyTy) {
ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
if (rewrite.isInvalid())
return ExprError();
Fn = rewrite.get();
goto retry;
}
return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
<< Fn->getType() << Fn->getSourceRange());
}
}
// Get the number of parameters in the function prototype, if any.
// We will allocate space for max(Args.size(), NumParams) arguments
// in the call expression.
const auto *Proto = dyn_cast_or_null<FunctionProtoType>(FuncT);
unsigned NumParams = Proto ? Proto->getNumParams() : 0;
CallExpr *TheCall;
if (Config) {
assert(UsesADL == ADLCallKind::NotADL &&
"CUDAKernelCallExpr should not use ADL");
TheCall = CUDAKernelCallExpr::Create(Context, Fn, cast<CallExpr>(Config),
Args, ResultTy, VK_PRValue, RParenLoc,
CurFPFeatureOverrides(), NumParams);
} else {
TheCall =
CallExpr::Create(Context, Fn, Args, ResultTy, VK_PRValue, RParenLoc,
CurFPFeatureOverrides(), NumParams, UsesADL);
}
if (!Context.isDependenceAllowed()) {
// Forget about the nulled arguments since typo correction
// do not handle them well.
TheCall->shrinkNumArgs(Args.size());
// C cannot always handle TypoExpr nodes in builtin calls and direct
// function calls as their argument checking don't necessarily handle
// dependent types properly, so make sure any TypoExprs have been
// dealt with.
ExprResult Result = CorrectDelayedTyposInExpr(TheCall);
if (!Result.isUsable()) return ExprError();
CallExpr *TheOldCall = TheCall;
TheCall = dyn_cast<CallExpr>(Result.get());
bool CorrectedTypos = TheCall != TheOldCall;
if (!TheCall) return Result;
Args = llvm::ArrayRef(TheCall->getArgs(), TheCall->getNumArgs());
// A new call expression node was created if some typos were corrected.
// However it may not have been constructed with enough storage. In this
// case, rebuild the node with enough storage. The waste of space is
// immaterial since this only happens when some typos were corrected.
if (CorrectedTypos && Args.size() < NumParams) {
if (Config)
TheCall = CUDAKernelCallExpr::Create(
Context, Fn, cast<CallExpr>(Config), Args, ResultTy, VK_PRValue,
RParenLoc, CurFPFeatureOverrides(), NumParams);
else
TheCall =
CallExpr::Create(Context, Fn, Args, ResultTy, VK_PRValue, RParenLoc,
CurFPFeatureOverrides(), NumParams, UsesADL);
}
// We can now handle the nulled arguments for the default arguments.
TheCall->setNumArgsUnsafe(std::max<unsigned>(Args.size(), NumParams));
}
// Bail out early if calling a builtin with custom type checking.
if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
if (getLangOpts().CUDA) {
if (Config) {
// CUDA: Kernel calls must be to global functions
if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
<< FDecl << Fn->getSourceRange());
// CUDA: Kernel function must have 'void' return type
if (!FuncT->getReturnType()->isVoidType() &&
!FuncT->getReturnType()->getAs<AutoType>() &&
!FuncT->getReturnType()->isInstantiationDependentType())
return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
<< Fn->getType() << Fn->getSourceRange());
} else {
// CUDA: Calls to global functions must be configured
if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
<< FDecl << Fn->getSourceRange());
}
}
// Check for a valid return type
if (CheckCallReturnType(FuncT->getReturnType(), Fn->getBeginLoc(), TheCall,
FDecl))
return ExprError();
// We know the result type of the call, set it.
TheCall->setType(FuncT->getCallResultType(Context));
TheCall->setValueKind(Expr::getValueKindForType(FuncT->getReturnType()));
// WebAssembly tables can't be used as arguments.
if (Context.getTargetInfo().getTriple().isWasm()) {
for (const Expr *Arg : Args) {
if (Arg && Arg->getType()->isWebAssemblyTableType()) {
return ExprError(Diag(Arg->getExprLoc(),
diag::err_wasm_table_as_function_parameter));
}
}
}
if (Proto) {
if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, RParenLoc,
IsExecConfig))
return ExprError();
} else {
assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
if (FDecl) {
// Check if we have too few/too many template arguments, based
// on our knowledge of the function definition.
const FunctionDecl *Def = nullptr;
if (FDecl->hasBody(Def) && Args.size() != Def->param_size()) {
Proto = Def->getType()->getAs<FunctionProtoType>();
if (!Proto || !(Proto->isVariadic() && Args.size() >= Def->param_size()))
Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
<< (Args.size() > Def->param_size()) << FDecl << Fn->getSourceRange();
}
// If the function we're calling isn't a function prototype, but we have
// a function prototype from a prior declaratiom, use that prototype.
if (!FDecl->hasPrototype())
Proto = FDecl->getType()->getAs<FunctionProtoType>();
}
// If we still haven't found a prototype to use but there are arguments to
// the call, diagnose this as calling a function without a prototype.
// However, if we found a function declaration, check to see if
// -Wdeprecated-non-prototype was disabled where the function was declared.
// If so, we will silence the diagnostic here on the assumption that this
// interface is intentional and the user knows what they're doing. We will
// also silence the diagnostic if there is a function declaration but it
// was implicitly defined (the user already gets diagnostics about the
// creation of the implicit function declaration, so the additional warning
// is not helpful).
if (!Proto && !Args.empty() &&
(!FDecl || (!FDecl->isImplicit() &&
!Diags.isIgnored(diag::warn_strict_uses_without_prototype,
FDecl->getLocation()))))
Diag(LParenLoc, diag::warn_strict_uses_without_prototype)
<< (FDecl != nullptr) << FDecl;
// Promote the arguments (C99 6.5.2.2p6).
for (unsigned i = 0, e = Args.size(); i != e; i++) {
Expr *Arg = Args[i];
if (Proto && i < Proto->getNumParams()) {
InitializedEntity Entity = InitializedEntity::InitializeParameter(
Context, Proto->getParamType(i), Proto->isParamConsumed(i));
ExprResult ArgE =
PerformCopyInitialization(Entity, SourceLocation(), Arg);
if (ArgE.isInvalid())
return true;
Arg = ArgE.getAs<Expr>();
} else {
ExprResult ArgE = DefaultArgumentPromotion(Arg);
if (ArgE.isInvalid())
return true;
Arg = ArgE.getAs<Expr>();
}
if (RequireCompleteType(Arg->getBeginLoc(), Arg->getType(),
diag::err_call_incomplete_argument, Arg))
return ExprError();
TheCall->setArg(i, Arg);
}
TheCall->computeDependence();
}
if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
if (Method->isImplicitObjectMemberFunction())
return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
<< Fn->getSourceRange() << 0);
// Check for sentinels
if (NDecl)
DiagnoseSentinelCalls(NDecl, LParenLoc, Args);
// Warn for unions passing across security boundary (CMSE).
if (FuncT != nullptr && FuncT->getCmseNSCallAttr()) {
for (unsigned i = 0, e = Args.size(); i != e; i++) {
if (const auto *RT =
dyn_cast<RecordType>(Args[i]->getType().getCanonicalType())) {
if (RT->getDecl()->isOrContainsUnion())
Diag(Args[i]->getBeginLoc(), diag::warn_cmse_nonsecure_union)
<< 0 << i;
}
}
}
// Do special checking on direct calls to functions.
if (FDecl) {
if (CheckFunctionCall(FDecl, TheCall, Proto))
return ExprError();
checkFortifiedBuiltinMemoryFunction(FDecl, TheCall);
if (BuiltinID)
return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
} else if (NDecl) {
if (CheckPointerCall(NDecl, TheCall, Proto))
return ExprError();
} else {
if (CheckOtherCall(TheCall, Proto))
return ExprError();
}
return CheckForImmediateInvocation(MaybeBindToTemporary(TheCall), FDecl);
}
ExprResult
Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
SourceLocation RParenLoc, Expr *InitExpr) {
assert(Ty && "ActOnCompoundLiteral(): missing type");
assert(InitExpr && "ActOnCompoundLiteral(): missing expression");
TypeSourceInfo *TInfo;
QualType literalType = GetTypeFromParser(Ty, &TInfo);
if (!TInfo)
TInfo = Context.getTrivialTypeSourceInfo(literalType);
return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
}
ExprResult
Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
SourceLocation RParenLoc, Expr *LiteralExpr) {
QualType literalType = TInfo->getType();
if (literalType->isArrayType()) {
if (RequireCompleteSizedType(
LParenLoc, Context.getBaseElementType(literalType),
diag::err_array_incomplete_or_sizeless_type,
SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd())))
return ExprError();
if (literalType->isVariableArrayType()) {
// C23 6.7.10p4: An entity of variable length array type shall not be
// initialized except by an empty initializer.
//
// The C extension warnings are issued from ParseBraceInitializer() and
// do not need to be issued here. However, we continue to issue an error
// in the case there are initializers or we are compiling C++. We allow
// use of VLAs in C++, but it's not clear we want to allow {} to zero
// init a VLA in C++ in all cases (such as with non-trivial constructors).
// FIXME: should we allow this construct in C++ when it makes sense to do
// so?
std::optional<unsigned> NumInits;
if (const auto *ILE = dyn_cast<InitListExpr>(LiteralExpr))
NumInits = ILE->getNumInits();
if ((LangOpts.CPlusPlus || NumInits.value_or(0)) &&
!tryToFixVariablyModifiedVarType(TInfo, literalType, LParenLoc,
diag::err_variable_object_no_init))
return ExprError();
}
} else if (!literalType->isDependentType() &&
RequireCompleteType(LParenLoc, literalType,
diag::err_typecheck_decl_incomplete_type,
SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd())))
return ExprError();
InitializedEntity Entity
= InitializedEntity::InitializeCompoundLiteralInit(TInfo);
InitializationKind Kind
= InitializationKind::CreateCStyleCast(LParenLoc,
SourceRange(LParenLoc, RParenLoc),
/*InitList=*/true);
InitializationSequence InitSeq(*this, Entity, Kind, LiteralExpr);
ExprResult Result = InitSeq.Perform(*this, Entity, Kind, LiteralExpr,
&literalType);
if (Result.isInvalid())
return ExprError();
LiteralExpr = Result.get();
bool isFileScope = !CurContext->isFunctionOrMethod();
// In C, compound literals are l-values for some reason.
// For GCC compatibility, in C++, file-scope array compound literals with
// constant initializers are also l-values, and compound literals are
// otherwise prvalues.
//
// (GCC also treats C++ list-initialized file-scope array prvalues with
// constant initializers as l-values, but that's non-conforming, so we don't
// follow it there.)
//
// FIXME: It would be better to handle the lvalue cases as materializing and
// lifetime-extending a temporary object, but our materialized temporaries
// representation only supports lifetime extension from a variable, not "out
// of thin air".
// FIXME: For C++, we might want to instead lifetime-extend only if a pointer
// is bound to the result of applying array-to-pointer decay to the compound
// literal.
// FIXME: GCC supports compound literals of reference type, which should
// obviously have a value kind derived from the kind of reference involved.
ExprValueKind VK =
(getLangOpts().CPlusPlus && !(isFileScope && literalType->isArrayType()))
? VK_PRValue
: VK_LValue;
if (isFileScope)
if (auto ILE = dyn_cast<InitListExpr>(LiteralExpr))
for (unsigned i = 0, j = ILE->getNumInits(); i != j; i++) {
Expr *Init = ILE->getInit(i);
ILE->setInit(i, ConstantExpr::Create(Context, Init));
}
auto *E = new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
VK, LiteralExpr, isFileScope);
if (isFileScope) {
if (!LiteralExpr->isTypeDependent() &&
!LiteralExpr->isValueDependent() &&
!literalType->isDependentType()) // C99 6.5.2.5p3
if (CheckForConstantInitializer(LiteralExpr, literalType))
return ExprError();
} else if (literalType.getAddressSpace() != LangAS::opencl_private &&
literalType.getAddressSpace() != LangAS::Default) {
// Embedded-C extensions to C99 6.5.2.5:
// "If the compound literal occurs inside the body of a function, the
// type name shall not be qualified by an address-space qualifier."
Diag(LParenLoc, diag::err_compound_literal_with_address_space)
<< SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd());
return ExprError();
}
if (!isFileScope && !getLangOpts().CPlusPlus) {
// Compound literals that have automatic storage duration are destroyed at
// the end of the scope in C; in C++, they're just temporaries.
// Emit diagnostics if it is or contains a C union type that is non-trivial
// to destruct.
if (E->getType().hasNonTrivialToPrimitiveDestructCUnion())
checkNonTrivialCUnion(E->getType(), E->getExprLoc(),
NTCUC_CompoundLiteral, NTCUK_Destruct);
// Diagnose jumps that enter or exit the lifetime of the compound literal.
if (literalType.isDestructedType()) {
Cleanup.setExprNeedsCleanups(true);
ExprCleanupObjects.push_back(E);
getCurFunction()->setHasBranchProtectedScope();
}
}
if (E->getType().hasNonTrivialToPrimitiveDefaultInitializeCUnion() ||
E->getType().hasNonTrivialToPrimitiveCopyCUnion())
checkNonTrivialCUnionInInitializer(E->getInitializer(),
E->getInitializer()->getExprLoc());
return MaybeBindToTemporary(E);
}
ExprResult
Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
SourceLocation RBraceLoc) {
// Only produce each kind of designated initialization diagnostic once.
SourceLocation FirstDesignator;
bool DiagnosedArrayDesignator = false;
bool DiagnosedNestedDesignator = false;
bool DiagnosedMixedDesignator = false;
// Check that any designated initializers are syntactically valid in the
// current language mode.
for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
if (auto *DIE = dyn_cast<DesignatedInitExpr>(InitArgList[I])) {
if (FirstDesignator.isInvalid())
FirstDesignator = DIE->getBeginLoc();
if (!getLangOpts().CPlusPlus)
break;
if (!DiagnosedNestedDesignator && DIE->size() > 1) {
DiagnosedNestedDesignator = true;
Diag(DIE->getBeginLoc(), diag::ext_designated_init_nested)
<< DIE->getDesignatorsSourceRange();
}
for (auto &Desig : DIE->designators()) {
if (!Desig.isFieldDesignator() && !DiagnosedArrayDesignator) {
DiagnosedArrayDesignator = true;
Diag(Desig.getBeginLoc(), diag::ext_designated_init_array)
<< Desig.getSourceRange();
}
}
if (!DiagnosedMixedDesignator &&
!isa<DesignatedInitExpr>(InitArgList[0])) {
DiagnosedMixedDesignator = true;
Diag(DIE->getBeginLoc(), diag::ext_designated_init_mixed)
<< DIE->getSourceRange();
Diag(InitArgList[0]->getBeginLoc(), diag::note_designated_init_mixed)
<< InitArgList[0]->getSourceRange();
}
} else if (getLangOpts().CPlusPlus && !DiagnosedMixedDesignator &&
isa<DesignatedInitExpr>(InitArgList[0])) {
DiagnosedMixedDesignator = true;
auto *DIE = cast<DesignatedInitExpr>(InitArgList[0]);
Diag(DIE->getBeginLoc(), diag::ext_designated_init_mixed)
<< DIE->getSourceRange();
Diag(InitArgList[I]->getBeginLoc(), diag::note_designated_init_mixed)
<< InitArgList[I]->getSourceRange();
}
}
if (FirstDesignator.isValid()) {
// Only diagnose designated initiaization as a C++20 extension if we didn't
// already diagnose use of (non-C++20) C99 designator syntax.
if (getLangOpts().CPlusPlus && !DiagnosedArrayDesignator &&
!DiagnosedNestedDesignator && !DiagnosedMixedDesignator) {
Diag(FirstDesignator, getLangOpts().CPlusPlus20
? diag::warn_cxx17_compat_designated_init
: diag::ext_cxx_designated_init);
} else if (!getLangOpts().CPlusPlus && !getLangOpts().C99) {
Diag(FirstDesignator, diag::ext_designated_init);
}
}
return BuildInitList(LBraceLoc, InitArgList, RBraceLoc);
}
ExprResult
Sema::BuildInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
SourceLocation RBraceLoc) {
// Semantic analysis for initializers is done by ActOnDeclarator() and
// CheckInitializer() - it requires knowledge of the object being initialized.
// Immediately handle non-overload placeholders. Overloads can be
// resolved contextually, but everything else here can't.
for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
if (InitArgList[I]->getType()->isNonOverloadPlaceholderType()) {
ExprResult result = CheckPlaceholderExpr(InitArgList[I]);
// Ignore failures; dropping the entire initializer list because
// of one failure would be terrible for indexing/etc.
if (result.isInvalid()) continue;
InitArgList[I] = result.get();
}
}
InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitArgList,
RBraceLoc);
E->setType(Context.VoidTy); // FIXME: just a place holder for now.
return E;
}
/// Do an explicit extend of the given block pointer if we're in ARC.
void Sema::maybeExtendBlockObject(ExprResult &E) {
assert(E.get()->getType()->isBlockPointerType());
assert(E.get()->isPRValue());
// Only do this in an r-value context.
if (!getLangOpts().ObjCAutoRefCount) return;
E = ImplicitCastExpr::Create(
Context, E.get()->getType(), CK_ARCExtendBlockObject, E.get(),
/*base path*/ nullptr, VK_PRValue, FPOptionsOverride());
Cleanup.setExprNeedsCleanups(true);
}
/// Prepare a conversion of the given expression to an ObjC object
/// pointer type.
CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
QualType type = E.get()->getType();
if (type->isObjCObjectPointerType()) {
return CK_BitCast;
} else if (type->isBlockPointerType()) {
maybeExtendBlockObject(E);
return CK_BlockPointerToObjCPointerCast;
} else {
assert(type->isPointerType());
return CK_CPointerToObjCPointerCast;
}
}
/// Prepares for a scalar cast, performing all the necessary stages
/// except the final cast and returning the kind required.
CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
// Both Src and Dest are scalar types, i.e. arithmetic or pointer.
// Also, callers should have filtered out the invalid cases with
// pointers. Everything else should be possible.
QualType SrcTy = Src.get()->getType();
if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
return CK_NoOp;
switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
case Type::STK_CPointer:
case Type::STK_BlockPointer:
case Type::STK_ObjCObjectPointer:
switch (DestTy->getScalarTypeKind()) {
case Type::STK_CPointer: {
LangAS SrcAS = SrcTy->getPointeeType().getAddressSpace();
LangAS DestAS = DestTy->getPointeeType().getAddressSpace();
if (SrcAS != DestAS)
return CK_AddressSpaceConversion;
if (Context.hasCvrSimilarType(SrcTy, DestTy))
return CK_NoOp;
return CK_BitCast;
}
case Type::STK_BlockPointer:
return (SrcKind == Type::STK_BlockPointer
? CK_BitCast : CK_AnyPointerToBlockPointerCast);
case Type::STK_ObjCObjectPointer:
if (SrcKind == Type::STK_ObjCObjectPointer)
return CK_BitCast;
if (SrcKind == Type::STK_CPointer)
return CK_CPointerToObjCPointerCast;
maybeExtendBlockObject(Src);
return CK_BlockPointerToObjCPointerCast;
case Type::STK_Bool:
return CK_PointerToBoolean;
case Type::STK_Integral:
return CK_PointerToIntegral;
case Type::STK_Floating:
case Type::STK_FloatingComplex:
case Type::STK_IntegralComplex:
case Type::STK_MemberPointer:
case Type::STK_FixedPoint:
llvm_unreachable("illegal cast from pointer");
}
llvm_unreachable("Should have returned before this");
case Type::STK_FixedPoint:
switch (DestTy->getScalarTypeKind()) {
case Type::STK_FixedPoint:
return CK_FixedPointCast;
case Type::STK_Bool:
return CK_FixedPointToBoolean;
case Type::STK_Integral:
return CK_FixedPointToIntegral;
case Type::STK_Floating:
return CK_FixedPointToFloating;
case Type::STK_IntegralComplex:
case Type::STK_FloatingComplex:
Diag(Src.get()->getExprLoc(),
diag::err_unimplemented_conversion_with_fixed_point_type)
<< DestTy;
return CK_IntegralCast;
case Type::STK_CPointer:
case Type::STK_ObjCObjectPointer:
case Type::STK_BlockPointer:
case Type::STK_MemberPointer:
llvm_unreachable("illegal cast to pointer type");
}
llvm_unreachable("Should have returned before this");
case Type::STK_Bool: // casting from bool is like casting from an integer
case Type::STK_Integral:
switch (DestTy->getScalarTypeKind()) {
case Type::STK_CPointer:
case Type::STK_ObjCObjectPointer:
case Type::STK_BlockPointer:
if (Src.get()->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNull))
return CK_NullToPointer;
return CK_IntegralToPointer;
case Type::STK_Bool:
return CK_IntegralToBoolean;
case Type::STK_Integral:
return CK_IntegralCast;
case Type::STK_Floating:
return CK_IntegralToFloating;
case Type::STK_IntegralComplex:
Src = ImpCastExprToType(Src.get(),
DestTy->castAs<ComplexType>()->getElementType(),
CK_IntegralCast);
return CK_IntegralRealToComplex;
case Type::STK_FloatingComplex:
Src = ImpCastExprToType(Src.get(),
DestTy->castAs<ComplexType>()->getElementType(),
CK_IntegralToFloating);
return CK_FloatingRealToComplex;
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
case Type::STK_FixedPoint:
return CK_IntegralToFixedPoint;
}
llvm_unreachable("Should have returned before this");
case Type::STK_Floating:
switch (DestTy->getScalarTypeKind()) {
case Type::STK_Floating:
return CK_FloatingCast;
case Type::STK_Bool:
return CK_FloatingToBoolean;
case Type::STK_Integral:
return CK_FloatingToIntegral;
case Type::STK_FloatingComplex:
Src = ImpCastExprToType(Src.get(),
DestTy->castAs<ComplexType>()->getElementType(),
CK_FloatingCast);
return CK_FloatingRealToComplex;
case Type::STK_IntegralComplex:
Src = ImpCastExprToType(Src.get(),
DestTy->castAs<ComplexType>()->getElementType(),
CK_FloatingToIntegral);
return CK_IntegralRealToComplex;
case Type::STK_CPointer:
case Type::STK_ObjCObjectPointer:
case Type::STK_BlockPointer:
llvm_unreachable("valid float->pointer cast?");
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
case Type::STK_FixedPoint:
return CK_FloatingToFixedPoint;
}
llvm_unreachable("Should have returned before this");
case Type::STK_FloatingComplex:
switch (DestTy->getScalarTypeKind()) {
case Type::STK_FloatingComplex:
return CK_FloatingComplexCast;
case Type::STK_IntegralComplex:
return CK_FloatingComplexToIntegralComplex;
case Type::STK_Floating: {
QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
if (Context.hasSameType(ET, DestTy))
return CK_FloatingComplexToReal;
Src = ImpCastExprToType(Src.get(), ET, CK_FloatingComplexToReal);
return CK_FloatingCast;
}
case Type::STK_Bool:
return CK_FloatingComplexToBoolean;
case Type::STK_Integral:
Src = ImpCastExprToType(Src.get(),
SrcTy->castAs<ComplexType>()->getElementType(),
CK_FloatingComplexToReal);
return CK_FloatingToIntegral;
case Type::STK_CPointer:
case Type::STK_ObjCObjectPointer:
case Type::STK_BlockPointer:
llvm_unreachable("valid complex float->pointer cast?");
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
case Type::STK_FixedPoint:
Diag(Src.get()->getExprLoc(),
diag::err_unimplemented_conversion_with_fixed_point_type)
<< SrcTy;
return CK_IntegralCast;
}
llvm_unreachable("Should have returned before this");
case Type::STK_IntegralComplex:
switch (DestTy->getScalarTypeKind()) {
case Type::STK_FloatingComplex:
return CK_IntegralComplexToFloatingComplex;
case Type::STK_IntegralComplex:
return CK_IntegralComplexCast;
case Type::STK_Integral: {
QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
if (Context.hasSameType(ET, DestTy))
return CK_IntegralComplexToReal;
Src = ImpCastExprToType(Src.get(), ET, CK_IntegralComplexToReal);
return CK_IntegralCast;
}
case Type::STK_Bool:
return CK_IntegralComplexToBoolean;
case Type::STK_Floating:
Src = ImpCastExprToType(Src.get(),
SrcTy->castAs<ComplexType>()->getElementType(),
CK_IntegralComplexToReal);
return CK_IntegralToFloating;
case Type::STK_CPointer:
case Type::STK_ObjCObjectPointer:
case Type::STK_BlockPointer:
llvm_unreachable("valid complex int->pointer cast?");
case Type::STK_MemberPointer:
llvm_unreachable("member pointer type in C");
case Type::STK_FixedPoint:
Diag(Src.get()->getExprLoc(),
diag::err_unimplemented_conversion_with_fixed_point_type)
<< SrcTy;
return CK_IntegralCast;
}
llvm_unreachable("Should have returned before this");
}
llvm_unreachable("Unhandled scalar cast");
}
static bool breakDownVectorType(QualType type, uint64_t &len,
QualType &eltType) {
// Vectors are simple.
if (const VectorType *vecType = type->getAs<VectorType>()) {
len = vecType->getNumElements();
eltType = vecType->getElementType();
assert(eltType->isScalarType());
return true;
}
// We allow lax conversion to and from non-vector types, but only if
// they're real types (i.e. non-complex, non-pointer scalar types).
if (!type->isRealType()) return false;
len = 1;
eltType = type;
return true;
}
/// Are the two types SVE-bitcast-compatible types? I.e. is bitcasting from the
/// first SVE type (e.g. an SVE VLAT) to the second type (e.g. an SVE VLST)
/// allowed?
///
/// This will also return false if the two given types do not make sense from
/// the perspective of SVE bitcasts.
bool Sema::isValidSveBitcast(QualType srcTy, QualType destTy) {
assert(srcTy->isVectorType() || destTy->isVectorType());
auto ValidScalableConversion = [](QualType FirstType, QualType SecondType) {
if (!FirstType->isSVESizelessBuiltinType())
return false;
const auto *VecTy = SecondType->getAs<VectorType>();
return VecTy && VecTy->getVectorKind() == VectorKind::SveFixedLengthData;
};
return ValidScalableConversion(srcTy, destTy) ||
ValidScalableConversion(destTy, srcTy);
}
/// Are the two types RVV-bitcast-compatible types? I.e. is bitcasting from the
/// first RVV type (e.g. an RVV scalable type) to the second type (e.g. an RVV
/// VLS type) allowed?
///
/// This will also return false if the two given types do not make sense from
/// the perspective of RVV bitcasts.
bool Sema::isValidRVVBitcast(QualType srcTy, QualType destTy) {
assert(srcTy->isVectorType() || destTy->isVectorType());
auto ValidScalableConversion = [](QualType FirstType, QualType SecondType) {
if (!FirstType->isRVVSizelessBuiltinType())
return false;
const auto *VecTy = SecondType->getAs<VectorType>();
return VecTy && VecTy->getVectorKind() == VectorKind::RVVFixedLengthData;
};
return ValidScalableConversion(srcTy, destTy) ||
ValidScalableConversion(destTy, srcTy);
}
/// Are the two types matrix types and do they have the same dimensions i.e.
/// do they have the same number of rows and the same number of columns?
bool Sema::areMatrixTypesOfTheSameDimension(QualType srcTy, QualType destTy) {
if (!destTy->isMatrixType() || !srcTy->isMatrixType())
return false;
const ConstantMatrixType *matSrcType = srcTy->getAs<ConstantMatrixType>();
const ConstantMatrixType *matDestType = destTy->getAs<ConstantMatrixType>();
return matSrcType->getNumRows() == matDestType->getNumRows() &&
matSrcType->getNumColumns() == matDestType->getNumColumns();
}
bool Sema::areVectorTypesSameSize(QualType SrcTy, QualType DestTy) {
assert(DestTy->isVectorType() || SrcTy->isVectorType());
uint64_t SrcLen, DestLen;
QualType SrcEltTy, DestEltTy;
if (!breakDownVectorType(SrcTy, SrcLen, SrcEltTy))
return false;
if (!breakDownVectorType(DestTy, DestLen, DestEltTy))
return false;
// ASTContext::getTypeSize will return the size rounded up to a
// power of 2, so instead of using that, we need to use the raw
// element size multiplied by the element count.
uint64_t SrcEltSize = Context.getTypeSize(SrcEltTy);
uint64_t DestEltSize = Context.getTypeSize(DestEltTy);
return (SrcLen * SrcEltSize == DestLen * DestEltSize);
}
// This returns true if at least one of the types is an altivec vector.
bool Sema::anyAltivecTypes(QualType SrcTy, QualType DestTy) {
assert((DestTy->isVectorType() || SrcTy->isVectorType()) &&
"expected at least one type to be a vector here");
bool IsSrcTyAltivec =
SrcTy->isVectorType() && ((SrcTy->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecVector) ||
(SrcTy->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecBool) ||
(SrcTy->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecPixel));
bool IsDestTyAltivec = DestTy->isVectorType() &&
((DestTy->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecVector) ||
(DestTy->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecBool) ||
(DestTy->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecPixel));
return (IsSrcTyAltivec || IsDestTyAltivec);
}
/// Are the two types lax-compatible vector types? That is, given
/// that one of them is a vector, do they have equal storage sizes,
/// where the storage size is the number of elements times the element
/// size?
///
/// This will also return false if either of the types is neither a
/// vector nor a real type.
bool Sema::areLaxCompatibleVectorTypes(QualType srcTy, QualType destTy) {
assert(destTy->isVectorType() || srcTy->isVectorType());
// Disallow lax conversions between scalars and ExtVectors (these
// conversions are allowed for other vector types because common headers
// depend on them). Most scalar OP ExtVector cases are handled by the
// splat path anyway, which does what we want (convert, not bitcast).
// What this rules out for ExtVectors is crazy things like char4*float.
if (srcTy->isScalarType() && destTy->isExtVectorType()) return false;
if (destTy->isScalarType() && srcTy->isExtVectorType()) return false;
return areVectorTypesSameSize(srcTy, destTy);
}
/// Is this a legal conversion between two types, one of which is
/// known to be a vector type?
bool Sema::isLaxVectorConversion(QualType srcTy, QualType destTy) {
assert(destTy->isVectorType() || srcTy->isVectorType());
switch (Context.getLangOpts().getLaxVectorConversions()) {
case LangOptions::LaxVectorConversionKind::None:
return false;
case LangOptions::LaxVectorConversionKind::Integer:
if (!srcTy->isIntegralOrEnumerationType()) {
auto *Vec = srcTy->getAs<VectorType>();
if (!Vec || !Vec->getElementType()->isIntegralOrEnumerationType())
return false;
}
if (!destTy->isIntegralOrEnumerationType()) {
auto *Vec = destTy->getAs<VectorType>();
if (!Vec || !Vec->getElementType()->isIntegralOrEnumerationType())
return false;
}
// OK, integer (vector) -> integer (vector) bitcast.
break;
case LangOptions::LaxVectorConversionKind::All:
break;
}
return areLaxCompatibleVectorTypes(srcTy, destTy);
}
bool Sema::CheckMatrixCast(SourceRange R, QualType DestTy, QualType SrcTy,
CastKind &Kind) {
if (SrcTy->isMatrixType() && DestTy->isMatrixType()) {
if (!areMatrixTypesOfTheSameDimension(SrcTy, DestTy)) {
return Diag(R.getBegin(), diag::err_invalid_conversion_between_matrixes)
<< DestTy << SrcTy << R;
}
} else if (SrcTy->isMatrixType()) {
return Diag(R.getBegin(),
diag::err_invalid_conversion_between_matrix_and_type)
<< SrcTy << DestTy << R;
} else if (DestTy->isMatrixType()) {
return Diag(R.getBegin(),
diag::err_invalid_conversion_between_matrix_and_type)
<< DestTy << SrcTy << R;
}
Kind = CK_MatrixCast;
return false;
}
bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
CastKind &Kind) {
assert(VectorTy->isVectorType() && "Not a vector type!");
if (Ty->isVectorType() || Ty->isIntegralType(Context)) {
if (!areLaxCompatibleVectorTypes(Ty, VectorTy))
return Diag(R.getBegin(),
Ty->isVectorType() ?
diag::err_invalid_conversion_between_vectors :
diag::err_invalid_conversion_between_vector_and_integer)
<< VectorTy << Ty << R;
} else
return Diag(R.getBegin(),
diag::err_invalid_conversion_between_vector_and_scalar)
<< VectorTy << Ty << R;
Kind = CK_BitCast;
return false;
}
ExprResult Sema::prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr) {
QualType DestElemTy = VectorTy->castAs<VectorType>()->getElementType();
if (DestElemTy == SplattedExpr->getType())
return SplattedExpr;
assert(DestElemTy->isFloatingType() ||
DestElemTy->isIntegralOrEnumerationType());
CastKind CK;
if (VectorTy->isExtVectorType() && SplattedExpr->getType()->isBooleanType()) {
// OpenCL requires that we convert `true` boolean expressions to -1, but
// only when splatting vectors.
if (DestElemTy->isFloatingType()) {
// To avoid having to have a CK_BooleanToSignedFloating cast kind, we cast
// in two steps: boolean to signed integral, then to floating.
ExprResult CastExprRes = ImpCastExprToType(SplattedExpr, Context.IntTy,
CK_BooleanToSignedIntegral);
SplattedExpr = CastExprRes.get();
CK = CK_IntegralToFloating;
} else {
CK = CK_BooleanToSignedIntegral;
}
} else {
ExprResult CastExprRes = SplattedExpr;
CK = PrepareScalarCast(CastExprRes, DestElemTy);
if (CastExprRes.isInvalid())
return ExprError();
SplattedExpr = CastExprRes.get();
}
return ImpCastExprToType(SplattedExpr, DestElemTy, CK);
}
ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
Expr *CastExpr, CastKind &Kind) {
assert(DestTy->isExtVectorType() && "Not an extended vector type!");
QualType SrcTy = CastExpr->getType();
// If SrcTy is a VectorType, the total size must match to explicitly cast to
// an ExtVectorType.
// In OpenCL, casts between vectors of different types are not allowed.
// (See OpenCL 6.2).
if (SrcTy->isVectorType()) {
if (!areLaxCompatibleVectorTypes(SrcTy, DestTy) ||
(getLangOpts().OpenCL &&
!Context.hasSameUnqualifiedType(DestTy, SrcTy))) {
Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
<< DestTy << SrcTy << R;
return ExprError();
}
Kind = CK_BitCast;
return CastExpr;
}
// All non-pointer scalars can be cast to ExtVector type. The appropriate
// conversion will take place first from scalar to elt type, and then
// splat from elt type to vector.
if (SrcTy->isPointerType())
return Diag(R.getBegin(),
diag::err_invalid_conversion_between_vector_and_scalar)
<< DestTy << SrcTy << R;
Kind = CK_VectorSplat;
return prepareVectorSplat(DestTy, CastExpr);
}
ExprResult
Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
Declarator &D, ParsedType &Ty,
SourceLocation RParenLoc, Expr *CastExpr) {
assert(!D.isInvalidType() && (CastExpr != nullptr) &&
"ActOnCastExpr(): missing type or expr");
TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
if (D.isInvalidType())
return ExprError();
if (getLangOpts().CPlusPlus) {
// Check that there are no default arguments (C++ only).
CheckExtraCXXDefaultArguments(D);
} else {
// Make sure any TypoExprs have been dealt with.
ExprResult Res = CorrectDelayedTyposInExpr(CastExpr);
if (!Res.isUsable())
return ExprError();
CastExpr = Res.get();
}
checkUnusedDeclAttributes(D);
QualType castType = castTInfo->getType();
Ty = CreateParsedType(castType, castTInfo);
bool isVectorLiteral = false;
// Check for an altivec or OpenCL literal,
// i.e. all the elements are integer constants.
ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
if ((getLangOpts().AltiVec || getLangOpts().ZVector || getLangOpts().OpenCL)
&& castType->isVectorType() && (PE || PLE)) {
if (PLE && PLE->getNumExprs() == 0) {
Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
return ExprError();
}
if (PE || PLE->getNumExprs() == 1) {
Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
if (!E->isTypeDependent() && !E->getType()->isVectorType())
isVectorLiteral = true;
}
else
isVectorLiteral = true;
}
// If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
// then handle it as such.
if (isVectorLiteral)
return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);
// If the Expr being casted is a ParenListExpr, handle it specially.
// This is not an AltiVec-style cast, so turn the ParenListExpr into a
// sequence of BinOp comma operators.
if (isa<ParenListExpr>(CastExpr)) {
ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
if (Result.isInvalid()) return ExprError();
CastExpr = Result.get();
}
if (getLangOpts().CPlusPlus && !castType->isVoidType())
Diag(LParenLoc, diag::warn_old_style_cast) << CastExpr->getSourceRange();
CheckTollFreeBridgeCast(castType, CastExpr);
CheckObjCBridgeRelatedCast(castType, CastExpr);
DiscardMisalignedMemberAddress(castType.getTypePtr(), CastExpr);
return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
}
ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
SourceLocation RParenLoc, Expr *E,
TypeSourceInfo *TInfo) {
assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
"Expected paren or paren list expression");
Expr **exprs;
unsigned numExprs;
Expr *subExpr;
SourceLocation LiteralLParenLoc, LiteralRParenLoc;
if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
LiteralLParenLoc = PE->getLParenLoc();
LiteralRParenLoc = PE->getRParenLoc();
exprs = PE->getExprs();
numExprs = PE->getNumExprs();
} else { // isa<ParenExpr> by assertion at function entrance
LiteralLParenLoc = cast<ParenExpr>(E)->getLParen();
LiteralRParenLoc = cast<ParenExpr>(E)->getRParen();
subExpr = cast<ParenExpr>(E)->getSubExpr();
exprs = &subExpr;
numExprs = 1;
}
QualType Ty = TInfo->getType();
assert(Ty->isVectorType() && "Expected vector type");
SmallVector<Expr *, 8> initExprs;
const VectorType *VTy = Ty->castAs<VectorType>();
unsigned numElems = VTy->getNumElements();
// '(...)' form of vector initialization in AltiVec: the number of
// initializers must be one or must match the size of the vector.
// If a single value is specified in the initializer then it will be
// replicated to all the components of the vector
if (CheckAltivecInitFromScalar(E->getSourceRange(), Ty,
VTy->getElementType()))
return ExprError();
if (ShouldSplatAltivecScalarInCast(VTy)) {
// The number of initializers must be one or must match the size of the
// vector. If a single value is specified in the initializer then it will
// be replicated to all the components of the vector
if (numExprs == 1) {
QualType ElemTy = VTy->getElementType();
ExprResult Literal = DefaultLvalueConversion(exprs[0]);
if (Literal.isInvalid())
return ExprError();
Literal = ImpCastExprToType(Literal.get(), ElemTy,
PrepareScalarCast(Literal, ElemTy));
return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
}
else if (numExprs < numElems) {
Diag(E->getExprLoc(),
diag::err_incorrect_number_of_vector_initializers);
return ExprError();
}
else
initExprs.append(exprs, exprs + numExprs);
}
else {
// For OpenCL, when the number of initializers is a single value,
// it will be replicated to all components of the vector.
if (getLangOpts().OpenCL && VTy->getVectorKind() == VectorKind::Generic &&
numExprs == 1) {
QualType ElemTy = VTy->getElementType();
ExprResult Literal = DefaultLvalueConversion(exprs[0]);
if (Literal.isInvalid())
return ExprError();
Literal = ImpCastExprToType(Literal.get(), ElemTy,
PrepareScalarCast(Literal, ElemTy));
return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
}
initExprs.append(exprs, exprs + numExprs);
}
// FIXME: This means that pretty-printing the final AST will produce curly
// braces instead of the original commas.
InitListExpr *initE = new (Context) InitListExpr(Context, LiteralLParenLoc,
initExprs, LiteralRParenLoc);
initE->setType(Ty);
return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
}
/// This is not an AltiVec-style cast or or C++ direct-initialization, so turn
/// the ParenListExpr into a sequence of comma binary operators.
ExprResult
Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
if (!E)
return OrigExpr;
ExprResult Result(E->getExpr(0));
for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
E->getExpr(i));
if (Result.isInvalid()) return ExprError();
return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
}
ExprResult Sema::ActOnParenListExpr(SourceLocation L,
SourceLocation R,
MultiExprArg Val) {
return ParenListExpr::Create(Context, L, Val, R);
}
/// Emit a specialized diagnostic when one expression is a null pointer
/// constant and the other is not a pointer. Returns true if a diagnostic is
/// emitted.
bool Sema::DiagnoseConditionalForNull(const Expr *LHSExpr, const Expr *RHSExpr,
SourceLocation QuestionLoc) {
const Expr *NullExpr = LHSExpr;
const Expr *NonPointerExpr = RHSExpr;
Expr::NullPointerConstantKind NullKind =
NullExpr->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNotNull);
if (NullKind == Expr::NPCK_NotNull) {
NullExpr = RHSExpr;
NonPointerExpr = LHSExpr;
NullKind =
NullExpr->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNotNull);
}
if (NullKind == Expr::NPCK_NotNull)
return false;
if (NullKind == Expr::NPCK_ZeroExpression)
return false;
if (NullKind == Expr::NPCK_ZeroLiteral) {
// In this case, check to make sure that we got here from a "NULL"
// string in the source code.
NullExpr = NullExpr->IgnoreParenImpCasts();
SourceLocation loc = NullExpr->getExprLoc();
if (!findMacroSpelling(loc, "NULL"))
return false;
}
int DiagType = (NullKind == Expr::NPCK_CXX11_nullptr);
Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
<< NonPointerExpr->getType() << DiagType
<< NonPointerExpr->getSourceRange();
return true;
}
/// Return false if the condition expression is valid, true otherwise.
static bool checkCondition(Sema &S, const Expr *Cond,
SourceLocation QuestionLoc) {
QualType CondTy = Cond->getType();
// OpenCL v1.1 s6.3.i says the condition cannot be a floating point type.
if (S.getLangOpts().OpenCL && CondTy->isFloatingType()) {
S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
<< CondTy << Cond->getSourceRange();
return true;
}
// C99 6.5.15p2
if (CondTy->isScalarType()) return false;
S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_scalar)
<< CondTy << Cond->getSourceRange();
return true;
}
/// Return false if the NullExpr can be promoted to PointerTy,
/// true otherwise.
static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
QualType PointerTy) {
if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
!NullExpr.get()->isNullPointerConstant(S.Context,
Expr::NPC_ValueDependentIsNull))
return true;
NullExpr = S.ImpCastExprToType(NullExpr.get(), PointerTy, CK_NullToPointer);
return false;
}
/// Checks compatibility between two pointers and return the resulting
/// type.
static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc) {
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
if (S.Context.hasSameType(LHSTy, RHSTy)) {
// Two identical pointers types are always compatible.
return S.Context.getCommonSugaredType(LHSTy, RHSTy);
}
QualType lhptee, rhptee;
// Get the pointee types.
bool IsBlockPointer = false;
if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
lhptee = LHSBTy->getPointeeType();
rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
IsBlockPointer = true;
} else {
lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
}
// C99 6.5.15p6: If both operands are pointers to compatible types or to
// differently qualified versions of compatible types, the result type is
// a pointer to an appropriately qualified version of the composite
// type.
// Only CVR-qualifiers exist in the standard, and the differently-qualified
// clause doesn't make sense for our extensions. E.g. address space 2 should
// be incompatible with address space 3: they may live on different devices or
// anything.
Qualifiers lhQual = lhptee.getQualifiers();
Qualifiers rhQual = rhptee.getQualifiers();
LangAS ResultAddrSpace = LangAS::Default;
LangAS LAddrSpace = lhQual.getAddressSpace();
LangAS RAddrSpace = rhQual.getAddressSpace();
// OpenCL v1.1 s6.5 - Conversion between pointers to distinct address
// spaces is disallowed.
if (lhQual.isAddressSpaceSupersetOf(rhQual))
ResultAddrSpace = LAddrSpace;
else if (rhQual.isAddressSpaceSupersetOf(lhQual))
ResultAddrSpace = RAddrSpace;
else {
S.Diag(Loc, diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
<< LHSTy << RHSTy << 2 << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
unsigned MergedCVRQual = lhQual.getCVRQualifiers() | rhQual.getCVRQualifiers();
auto LHSCastKind = CK_BitCast, RHSCastKind = CK_BitCast;
lhQual.removeCVRQualifiers();
rhQual.removeCVRQualifiers();
// OpenCL v2.0 specification doesn't extend compatibility of type qualifiers
// (C99 6.7.3) for address spaces. We assume that the check should behave in
// the same manner as it's defined for CVR qualifiers, so for OpenCL two
// qual types are compatible iff
// * corresponded types are compatible
// * CVR qualifiers are equal
// * address spaces are equal
// Thus for conditional operator we merge CVR and address space unqualified
// pointees and if there is a composite type we return a pointer to it with
// merged qualifiers.
LHSCastKind =
LAddrSpace == ResultAddrSpace ? CK_BitCast : CK_AddressSpaceConversion;
RHSCastKind =
RAddrSpace == ResultAddrSpace ? CK_BitCast : CK_AddressSpaceConversion;
lhQual.removeAddressSpace();
rhQual.removeAddressSpace();
lhptee = S.Context.getQualifiedType(lhptee.getUnqualifiedType(), lhQual);
rhptee = S.Context.getQualifiedType(rhptee.getUnqualifiedType(), rhQual);
QualType CompositeTy = S.Context.mergeTypes(
lhptee, rhptee, /*OfBlockPointer=*/false, /*Unqualified=*/false,
/*BlockReturnType=*/false, /*IsConditionalOperator=*/true);
if (CompositeTy.isNull()) {
// In this situation, we assume void* type. No especially good
// reason, but this is what gcc does, and we do have to pick
// to get a consistent AST.
QualType incompatTy;
incompatTy = S.Context.getPointerType(
S.Context.getAddrSpaceQualType(S.Context.VoidTy, ResultAddrSpace));
LHS = S.ImpCastExprToType(LHS.get(), incompatTy, LHSCastKind);
RHS = S.ImpCastExprToType(RHS.get(), incompatTy, RHSCastKind);
// FIXME: For OpenCL the warning emission and cast to void* leaves a room
// for casts between types with incompatible address space qualifiers.
// For the following code the compiler produces casts between global and
// local address spaces of the corresponded innermost pointees:
// local int *global *a;
// global int *global *b;
// a = (0 ? a : b); // see C99 6.5.16.1.p1.
S.Diag(Loc, diag::ext_typecheck_cond_incompatible_pointers)
<< LHSTy << RHSTy << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return incompatTy;
}
// The pointer types are compatible.
// In case of OpenCL ResultTy should have the address space qualifier
// which is a superset of address spaces of both the 2nd and the 3rd
// operands of the conditional operator.
QualType ResultTy = [&, ResultAddrSpace]() {
if (S.getLangOpts().OpenCL) {
Qualifiers CompositeQuals = CompositeTy.getQualifiers();
CompositeQuals.setAddressSpace(ResultAddrSpace);
return S.Context
.getQualifiedType(CompositeTy.getUnqualifiedType(), CompositeQuals)
.withCVRQualifiers(MergedCVRQual);
}
return CompositeTy.withCVRQualifiers(MergedCVRQual);
}();
if (IsBlockPointer)
ResultTy = S.Context.getBlockPointerType(ResultTy);
else
ResultTy = S.Context.getPointerType(ResultTy);
LHS = S.ImpCastExprToType(LHS.get(), ResultTy, LHSCastKind);
RHS = S.ImpCastExprToType(RHS.get(), ResultTy, RHSCastKind);
return ResultTy;
}
/// Return the resulting type when the operands are both block pointers.
static QualType checkConditionalBlockPointerCompatibility(Sema &S,
ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc) {
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
QualType destType = S.Context.getPointerType(S.Context.VoidTy);
LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
return destType;
}
S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
<< LHSTy << RHSTy << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
// We have 2 block pointer types.
return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
}
/// Return the resulting type when the operands are both pointers.
static QualType
checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc) {
// get the pointer types
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
// get the "pointed to" types
QualType lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
QualType rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
// ignore qualifiers on void (C99 6.5.15p3, clause 6)
if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
// Figure out necessary qualifiers (C99 6.5.15p6)
QualType destPointee
= S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
QualType destType = S.Context.getPointerType(destPointee);
// Add qualifiers if necessary.
LHS = S.ImpCastExprToType(LHS.get(), destType, CK_NoOp);
// Promote to void*.
RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
return destType;
}
if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
QualType destPointee
= S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
QualType destType = S.Context.getPointerType(destPointee);
// Add qualifiers if necessary.
RHS = S.ImpCastExprToType(RHS.get(), destType, CK_NoOp);
// Promote to void*.
LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
return destType;
}
return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
}
/// Return false if the first expression is not an integer and the second
/// expression is not a pointer, true otherwise.
static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
Expr* PointerExpr, SourceLocation Loc,
bool IsIntFirstExpr) {
if (!PointerExpr->getType()->isPointerType() ||
!Int.get()->getType()->isIntegerType())
return false;
Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();
S.Diag(Loc, diag::ext_typecheck_cond_pointer_integer_mismatch)
<< Expr1->getType() << Expr2->getType()
<< Expr1->getSourceRange() << Expr2->getSourceRange();
Int = S.ImpCastExprToType(Int.get(), PointerExpr->getType(),
CK_IntegralToPointer);
return true;
}
/// Simple conversion between integer and floating point types.
///
/// Used when handling the OpenCL conditional operator where the
/// condition is a vector while the other operands are scalar.
///
/// OpenCL v1.1 s6.3.i and s6.11.6 together require that the scalar
/// types are either integer or floating type. Between the two
/// operands, the type with the higher rank is defined as the "result
/// type". The other operand needs to be promoted to the same type. No
/// other type promotion is allowed. We cannot use
/// UsualArithmeticConversions() for this purpose, since it always
/// promotes promotable types.
static QualType OpenCLArithmeticConversions(Sema &S, ExprResult &LHS,
ExprResult &RHS,
SourceLocation QuestionLoc) {
LHS = S.DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType =
S.Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
QualType RHSType =
S.Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
if (!LHSType->isIntegerType() && !LHSType->isRealFloatingType()) {
S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
<< LHSType << LHS.get()->getSourceRange();
return QualType();
}
if (!RHSType->isIntegerType() && !RHSType->isRealFloatingType()) {
S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
<< RHSType << RHS.get()->getSourceRange();
return QualType();
}
// If both types are identical, no conversion is needed.
if (LHSType == RHSType)
return LHSType;
// Now handle "real" floating types (i.e. float, double, long double).
if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
return handleFloatConversion(S, LHS, RHS, LHSType, RHSType,
/*IsCompAssign = */ false);
// Finally, we have two differing integer types.
return handleIntegerConversion<doIntegralCast, doIntegralCast>
(S, LHS, RHS, LHSType, RHSType, /*IsCompAssign = */ false);
}
/// Convert scalar operands to a vector that matches the
/// condition in length.
///
/// Used when handling the OpenCL conditional operator where the
/// condition is a vector while the other operands are scalar.
///
/// We first compute the "result type" for the scalar operands
/// according to OpenCL v1.1 s6.3.i. Both operands are then converted
/// into a vector of that type where the length matches the condition
/// vector type. s6.11.6 requires that the element types of the result
/// and the condition must have the same number of bits.
static QualType
OpenCLConvertScalarsToVectors(Sema &S, ExprResult &LHS, ExprResult &RHS,
QualType CondTy, SourceLocation QuestionLoc) {
QualType ResTy = OpenCLArithmeticConversions(S, LHS, RHS, QuestionLoc);
if (ResTy.isNull()) return QualType();
const VectorType *CV = CondTy->getAs<VectorType>();
assert(CV);
// Determine the vector result type
unsigned NumElements = CV->getNumElements();
QualType VectorTy = S.Context.getExtVectorType(ResTy, NumElements);
// Ensure that all types have the same number of bits
if (S.Context.getTypeSize(CV->getElementType())
!= S.Context.getTypeSize(ResTy)) {
// Since VectorTy is created internally, it does not pretty print
// with an OpenCL name. Instead, we just print a description.
std::string EleTyName = ResTy.getUnqualifiedType().getAsString();
SmallString<64> Str;
llvm::raw_svector_ostream OS(Str);
OS << "(vector of " << NumElements << " '" << EleTyName << "' values)";
S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
<< CondTy << OS.str();
return QualType();
}
// Convert operands to the vector result type
LHS = S.ImpCastExprToType(LHS.get(), VectorTy, CK_VectorSplat);
RHS = S.ImpCastExprToType(RHS.get(), VectorTy, CK_VectorSplat);
return VectorTy;
}
/// Return false if this is a valid OpenCL condition vector
static bool checkOpenCLConditionVector(Sema &S, Expr *Cond,
SourceLocation QuestionLoc) {
// OpenCL v1.1 s6.11.6 says the elements of the vector must be of
// integral type.
const VectorType *CondTy = Cond->getType()->getAs<VectorType>();
assert(CondTy);
QualType EleTy = CondTy->getElementType();
if (EleTy->isIntegerType()) return false;
S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
<< Cond->getType() << Cond->getSourceRange();
return true;
}
/// Return false if the vector condition type and the vector
/// result type are compatible.
///
/// OpenCL v1.1 s6.11.6 requires that both vector types have the same
/// number of elements, and their element types have the same number
/// of bits.
static bool checkVectorResult(Sema &S, QualType CondTy, QualType VecResTy,
SourceLocation QuestionLoc) {
const VectorType *CV = CondTy->getAs<VectorType>();
const VectorType *RV = VecResTy->getAs<VectorType>();
assert(CV && RV);
if (CV->getNumElements() != RV->getNumElements()) {
S.Diag(QuestionLoc, diag::err_conditional_vector_size)
<< CondTy << VecResTy;
return true;
}
QualType CVE = CV->getElementType();
QualType RVE = RV->getElementType();
if (S.Context.getTypeSize(CVE) != S.Context.getTypeSize(RVE)) {
S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
<< CondTy << VecResTy;
return true;
}
return false;
}
/// Return the resulting type for the conditional operator in
/// OpenCL (aka "ternary selection operator", OpenCL v1.1
/// s6.3.i) when the condition is a vector type.
static QualType
OpenCLCheckVectorConditional(Sema &S, ExprResult &Cond,
ExprResult &LHS, ExprResult &RHS,
SourceLocation QuestionLoc) {
Cond = S.DefaultFunctionArrayLvalueConversion(Cond.get());
if (Cond.isInvalid())
return QualType();
QualType CondTy = Cond.get()->getType();
if (checkOpenCLConditionVector(S, Cond.get(), QuestionLoc))
return QualType();
// If either operand is a vector then find the vector type of the
// result as specified in OpenCL v1.1 s6.3.i.
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType()) {
bool IsBoolVecLang =
!S.getLangOpts().OpenCL && !S.getLangOpts().OpenCLCPlusPlus;
QualType VecResTy =
S.CheckVectorOperands(LHS, RHS, QuestionLoc,
/*isCompAssign*/ false,
/*AllowBothBool*/ true,
/*AllowBoolConversions*/ false,
/*AllowBooleanOperation*/ IsBoolVecLang,
/*ReportInvalid*/ true);
if (VecResTy.isNull())
return QualType();
// The result type must match the condition type as specified in
// OpenCL v1.1 s6.11.6.
if (checkVectorResult(S, CondTy, VecResTy, QuestionLoc))
return QualType();
return VecResTy;
}
// Both operands are scalar.
return OpenCLConvertScalarsToVectors(S, LHS, RHS, CondTy, QuestionLoc);
}
/// Return true if the Expr is block type
static bool checkBlockType(Sema &S, const Expr *E) {
if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
QualType Ty = CE->getCallee()->getType();
if (Ty->isBlockPointerType()) {
S.Diag(E->getExprLoc(), diag::err_opencl_ternary_with_block);
return true;
}
}
return false;
}
/// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
/// In that case, LHS = cond.
/// C99 6.5.15
QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
ExprResult &RHS, ExprValueKind &VK,
ExprObjectKind &OK,
SourceLocation QuestionLoc) {
ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
if (!LHSResult.isUsable()) return QualType();
LHS = LHSResult;
ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
if (!RHSResult.isUsable()) return QualType();
RHS = RHSResult;
// C++ is sufficiently different to merit its own checker.
if (getLangOpts().CPlusPlus)
return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
VK = VK_PRValue;
OK = OK_Ordinary;
if (Context.isDependenceAllowed() &&
(Cond.get()->isTypeDependent() || LHS.get()->isTypeDependent() ||
RHS.get()->isTypeDependent())) {
assert(!getLangOpts().CPlusPlus);
assert((Cond.get()->containsErrors() || LHS.get()->containsErrors() ||
RHS.get()->containsErrors()) &&
"should only occur in error-recovery path.");
return Context.DependentTy;
}
// The OpenCL operator with a vector condition is sufficiently
// different to merit its own checker.
if ((getLangOpts().OpenCL && Cond.get()->getType()->isVectorType()) ||
Cond.get()->getType()->isExtVectorType())
return OpenCLCheckVectorConditional(*this, Cond, LHS, RHS, QuestionLoc);
// First, check the condition.
Cond = UsualUnaryConversions(Cond.get());
if (Cond.isInvalid())
return QualType();
if (checkCondition(*this, Cond.get(), QuestionLoc))
return QualType();
// Handle vectors.
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType())
return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/ false,
/*AllowBothBool*/ true,
/*AllowBoolConversions*/ false,
/*AllowBooleanOperation*/ false,
/*ReportInvalid*/ true);
QualType ResTy =
UsualArithmeticConversions(LHS, RHS, QuestionLoc, ACK_Conditional);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
// WebAssembly tables are not allowed as conditional LHS or RHS.
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
if (LHSTy->isWebAssemblyTableType() || RHSTy->isWebAssemblyTableType()) {
Diag(QuestionLoc, diag::err_wasm_table_conditional_expression)
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
}
// Diagnose attempts to convert between __ibm128, __float128 and long double
// where such conversions currently can't be handled.
if (unsupportedTypeConversion(*this, LHSTy, RHSTy)) {
Diag(QuestionLoc,
diag::err_typecheck_cond_incompatible_operands) << LHSTy << RHSTy
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
}
// OpenCL v2.0 s6.12.5 - Blocks cannot be used as expressions of the ternary
// selection operator (?:).
if (getLangOpts().OpenCL &&
((int)checkBlockType(*this, LHS.get()) | (int)checkBlockType(*this, RHS.get()))) {
return QualType();
}
// If both operands have arithmetic type, do the usual arithmetic conversions
// to find a common type: C99 6.5.15p3,5.
if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
// Disallow invalid arithmetic conversions, such as those between bit-
// precise integers types of different sizes, or between a bit-precise
// integer and another type.
if (ResTy.isNull() && (LHSTy->isBitIntType() || RHSTy->isBitIntType())) {
Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
<< LHSTy << RHSTy << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
LHS = ImpCastExprToType(LHS.get(), ResTy, PrepareScalarCast(LHS, ResTy));
RHS = ImpCastExprToType(RHS.get(), ResTy, PrepareScalarCast(RHS, ResTy));
return ResTy;
}
// If both operands are the same structure or union type, the result is that
// type.
if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
if (LHSRT->getDecl() == RHSRT->getDecl())
// "If both the operands have structure or union type, the result has
// that type." This implies that CV qualifiers are dropped.
return Context.getCommonSugaredType(LHSTy.getUnqualifiedType(),
RHSTy.getUnqualifiedType());
// FIXME: Type of conditional expression must be complete in C mode.
}
// C99 6.5.15p5: "If both operands have void type, the result has void type."
// The following || allows only one side to be void (a GCC-ism).
if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
QualType ResTy;
if (LHSTy->isVoidType() && RHSTy->isVoidType()) {
ResTy = Context.getCommonSugaredType(LHSTy, RHSTy);
} else if (RHSTy->isVoidType()) {
ResTy = RHSTy;
Diag(RHS.get()->getBeginLoc(), diag::ext_typecheck_cond_one_void)
<< RHS.get()->getSourceRange();
} else {
ResTy = LHSTy;
Diag(LHS.get()->getBeginLoc(), diag::ext_typecheck_cond_one_void)
<< LHS.get()->getSourceRange();
}
LHS = ImpCastExprToType(LHS.get(), ResTy, CK_ToVoid);
RHS = ImpCastExprToType(RHS.get(), ResTy, CK_ToVoid);
return ResTy;
}
// C23 6.5.15p7:
// ... if both the second and third operands have nullptr_t type, the
// result also has that type.
if (LHSTy->isNullPtrType() && Context.hasSameType(LHSTy, RHSTy))
return ResTy;
// C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
// the type of the other operand."
if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;
// All objective-c pointer type analysis is done here.
QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
QuestionLoc);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
if (!compositeType.isNull())
return compositeType;
// Handle block pointer types.
if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
QuestionLoc);
// Check constraints for C object pointers types (C99 6.5.15p3,6).
if (LHSTy->isPointerType() && RHSTy->isPointerType())
return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
QuestionLoc);
// GCC compatibility: soften pointer/integer mismatch. Note that
// null pointers have been filtered out by this point.
if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
/*IsIntFirstExpr=*/true))
return RHSTy;
if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
/*IsIntFirstExpr=*/false))
return LHSTy;
// Emit a better diagnostic if one of the expressions is a null pointer
// constant and the other is not a pointer type. In this case, the user most
// likely forgot to take the address of the other expression.
if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
return QualType();
// Finally, if the LHS and RHS types are canonically the same type, we can
// use the common sugared type.
if (Context.hasSameType(LHSTy, RHSTy))
return Context.getCommonSugaredType(LHSTy, RHSTy);
// Otherwise, the operands are not compatible.
Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
<< LHSTy << RHSTy << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
/// FindCompositeObjCPointerType - Helper method to find composite type of
/// two objective-c pointer types of the two input expressions.
QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
SourceLocation QuestionLoc) {
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
// Handle things like Class and struct objc_class*. Here we case the result
// to the pseudo-builtin, because that will be implicitly cast back to the
// redefinition type if an attempt is made to access its fields.
if (LHSTy->isObjCClassType() &&
(Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
return LHSTy;
}
if (RHSTy->isObjCClassType() &&
(Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
return RHSTy;
}
// And the same for struct objc_object* / id
if (LHSTy->isObjCIdType() &&
(Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
return LHSTy;
}
if (RHSTy->isObjCIdType() &&
(Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
return RHSTy;
}
// And the same for struct objc_selector* / SEL
if (Context.isObjCSelType(LHSTy) &&
(Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_BitCast);
return LHSTy;
}
if (Context.isObjCSelType(RHSTy) &&
(Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_BitCast);
return RHSTy;
}
// Check constraints for Objective-C object pointers types.
if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
// Two identical object pointer types are always compatible.
return LHSTy;
}
const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
QualType compositeType = LHSTy;
// If both operands are interfaces and either operand can be
// assigned to the other, use that type as the composite
// type. This allows
// xxx ? (A*) a : (B*) b
// where B is a subclass of A.
//
// Additionally, as for assignment, if either type is 'id'
// allow silent coercion. Finally, if the types are
// incompatible then make sure to use 'id' as the composite
// type so the result is acceptable for sending messages to.
// FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
// It could return the composite type.
if (!(compositeType =
Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull()) {
// Nothing more to do.
} else if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
} else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
} else if ((LHSOPT->isObjCQualifiedIdType() ||
RHSOPT->isObjCQualifiedIdType()) &&
Context.ObjCQualifiedIdTypesAreCompatible(LHSOPT, RHSOPT,
true)) {
// Need to handle "id<xx>" explicitly.
// GCC allows qualified id and any Objective-C type to devolve to
// id. Currently localizing to here until clear this should be
// part of ObjCQualifiedIdTypesAreCompatible.
compositeType = Context.getObjCIdType();
} else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
compositeType = Context.getObjCIdType();
} else {
Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
<< LHSTy << RHSTy
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
QualType incompatTy = Context.getObjCIdType();
LHS = ImpCastExprToType(LHS.get(), incompatTy, CK_BitCast);
RHS = ImpCastExprToType(RHS.get(), incompatTy, CK_BitCast);
return incompatTy;
}
// The object pointer types are compatible.
LHS = ImpCastExprToType(LHS.get(), compositeType, CK_BitCast);
RHS = ImpCastExprToType(RHS.get(), compositeType, CK_BitCast);
return compositeType;
}
// Check Objective-C object pointer types and 'void *'
if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
if (getLangOpts().ObjCAutoRefCount) {
// ARC forbids the implicit conversion of object pointers to 'void *',
// so these types are not compatible.
Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
LHS = RHS = true;
return QualType();
}
QualType lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
QualType rhptee = RHSTy->castAs<ObjCObjectPointerType>()->getPointeeType();
QualType destPointee
= Context.getQualifiedType(lhptee, rhptee.getQualifiers());
QualType destType = Context.getPointerType(destPointee);
// Add qualifiers if necessary.
LHS = ImpCastExprToType(LHS.get(), destType, CK_NoOp);
// Promote to void*.
RHS = ImpCastExprToType(RHS.get(), destType, CK_BitCast);
return destType;
}
if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
if (getLangOpts().ObjCAutoRefCount) {
// ARC forbids the implicit conversion of object pointers to 'void *',
// so these types are not compatible.
Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
LHS = RHS = true;
return QualType();
}
QualType lhptee = LHSTy->castAs<ObjCObjectPointerType>()->getPointeeType();
QualType rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
QualType destPointee
= Context.getQualifiedType(rhptee, lhptee.getQualifiers());
QualType destType = Context.getPointerType(destPointee);
// Add qualifiers if necessary.
RHS = ImpCastExprToType(RHS.get(), destType, CK_NoOp);
// Promote to void*.
LHS = ImpCastExprToType(LHS.get(), destType, CK_BitCast);
return destType;
}
return QualType();
}
/// SuggestParentheses - Emit a note with a fixit hint that wraps
/// ParenRange in parentheses.
static void SuggestParentheses(Sema &Self, SourceLocation Loc,
const PartialDiagnostic &Note,
SourceRange ParenRange) {
SourceLocation EndLoc = Self.getLocForEndOfToken(ParenRange.getEnd());
if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
EndLoc.isValid()) {
Self.Diag(Loc, Note)
<< FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
<< FixItHint::CreateInsertion(EndLoc, ")");
} else {
// We can't display the parentheses, so just show the bare note.
Self.Diag(Loc, Note) << ParenRange;
}
}
static bool IsArithmeticOp(BinaryOperatorKind Opc) {
return BinaryOperator::isAdditiveOp(Opc) ||
BinaryOperator::isMultiplicativeOp(Opc) ||
BinaryOperator::isShiftOp(Opc) || Opc == BO_And || Opc == BO_Or;
// This only checks for bitwise-or and bitwise-and, but not bitwise-xor and
// not any of the logical operators. Bitwise-xor is commonly used as a
// logical-xor because there is no logical-xor operator. The logical
// operators, including uses of xor, have a high false positive rate for
// precedence warnings.
}
/// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
/// expression, either using a built-in or overloaded operator,
/// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
/// expression.
static bool IsArithmeticBinaryExpr(const Expr *E, BinaryOperatorKind *Opcode,
const Expr **RHSExprs) {
// Don't strip parenthesis: we should not warn if E is in parenthesis.
E = E->IgnoreImpCasts();
E = E->IgnoreConversionOperatorSingleStep();
E = E->IgnoreImpCasts();
if (const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
E = MTE->getSubExpr();
E = E->IgnoreImpCasts();
}
// Built-in binary operator.
if (const auto *OP = dyn_cast<BinaryOperator>(E);
OP && IsArithmeticOp(OP->getOpcode())) {
*Opcode = OP->getOpcode();
*RHSExprs = OP->getRHS();
return true;
}
// Overloaded operator.
if (const auto *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
if (Call->getNumArgs() != 2)
return false;
// Make sure this is really a binary operator that is safe to pass into
// BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
OverloadedOperatorKind OO = Call->getOperator();
if (OO < OO_Plus || OO > OO_Arrow ||
OO == OO_PlusPlus || OO == OO_MinusMinus)
return false;
BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
if (IsArithmeticOp(OpKind)) {
*Opcode = OpKind;
*RHSExprs = Call->getArg(1);
return true;
}
}
return false;
}
/// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
/// or is a logical expression such as (x==y) which has int type, but is
/// commonly interpreted as boolean.
static bool ExprLooksBoolean(const Expr *E) {
E = E->IgnoreParenImpCasts();
if (E->getType()->isBooleanType())
return true;
if (const auto *OP = dyn_cast<BinaryOperator>(E))
return OP->isComparisonOp() || OP->isLogicalOp();
if (const auto *OP = dyn_cast<UnaryOperator>(E))
return OP->getOpcode() == UO_LNot;
if (E->getType()->isPointerType())
return true;
// FIXME: What about overloaded operator calls returning "unspecified boolean
// type"s (commonly pointer-to-members)?
return false;
}
/// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
/// and binary operator are mixed in a way that suggests the programmer assumed
/// the conditional operator has higher precedence, for example:
/// "int x = a + someBinaryCondition ? 1 : 2".
static void DiagnoseConditionalPrecedence(Sema &Self, SourceLocation OpLoc,
Expr *Condition, const Expr *LHSExpr,
const Expr *RHSExpr) {
BinaryOperatorKind CondOpcode;
const Expr *CondRHS;
if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
return;
if (!ExprLooksBoolean(CondRHS))
return;
// The condition is an arithmetic binary expression, with a right-
// hand side that looks boolean, so warn.
unsigned DiagID = BinaryOperator::isBitwiseOp(CondOpcode)
? diag::warn_precedence_bitwise_conditional
: diag::warn_precedence_conditional;
Self.Diag(OpLoc, DiagID)
<< Condition->getSourceRange()
<< BinaryOperator::getOpcodeStr(CondOpcode);
SuggestParentheses(
Self, OpLoc,
Self.PDiag(diag::note_precedence_silence)
<< BinaryOperator::getOpcodeStr(CondOpcode),
SourceRange(Condition->getBeginLoc(), Condition->getEndLoc()));
SuggestParentheses(Self, OpLoc,
Self.PDiag(diag::note_precedence_conditional_first),
SourceRange(CondRHS->getBeginLoc(), RHSExpr->getEndLoc()));
}
/// Compute the nullability of a conditional expression.
static QualType computeConditionalNullability(QualType ResTy, bool IsBin,
QualType LHSTy, QualType RHSTy,
ASTContext &Ctx) {
if (!ResTy->isAnyPointerType())
return ResTy;
auto GetNullability = [](QualType Ty) {
std::optional<NullabilityKind> Kind = Ty->getNullability();
if (Kind) {
// For our purposes, treat _Nullable_result as _Nullable.
if (*Kind == NullabilityKind::NullableResult)
return NullabilityKind::Nullable;
return *Kind;
}
return NullabilityKind::Unspecified;
};
auto LHSKind = GetNullability(LHSTy), RHSKind = GetNullability(RHSTy);
NullabilityKind MergedKind;
// Compute nullability of a binary conditional expression.
if (IsBin) {
if (LHSKind == NullabilityKind::NonNull)
MergedKind = NullabilityKind::NonNull;
else
MergedKind = RHSKind;
// Compute nullability of a normal conditional expression.
} else {
if (LHSKind == NullabilityKind::Nullable ||
RHSKind == NullabilityKind::Nullable)
MergedKind = NullabilityKind::Nullable;
else if (LHSKind == NullabilityKind::NonNull)
MergedKind = RHSKind;
else if (RHSKind == NullabilityKind::NonNull)
MergedKind = LHSKind;
else
MergedKind = NullabilityKind::Unspecified;
}
// Return if ResTy already has the correct nullability.
if (GetNullability(ResTy) == MergedKind)
return ResTy;
// Strip all nullability from ResTy.
while (ResTy->getNullability())
ResTy = ResTy.getSingleStepDesugaredType(Ctx);
// Create a new AttributedType with the new nullability kind.
auto NewAttr = AttributedType::getNullabilityAttrKind(MergedKind);
return Ctx.getAttributedType(NewAttr, ResTy, ResTy);
}
/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
/// in the case of a the GNU conditional expr extension.
ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
SourceLocation ColonLoc,
Expr *CondExpr, Expr *LHSExpr,
Expr *RHSExpr) {
if (!Context.isDependenceAllowed()) {
// C cannot handle TypoExpr nodes in the condition because it
// doesn't handle dependent types properly, so make sure any TypoExprs have
// been dealt with before checking the operands.
ExprResult CondResult = CorrectDelayedTyposInExpr(CondExpr);
ExprResult LHSResult = CorrectDelayedTyposInExpr(LHSExpr);
ExprResult RHSResult = CorrectDelayedTyposInExpr(RHSExpr);
if (!CondResult.isUsable())
return ExprError();
if (LHSExpr) {
if (!LHSResult.isUsable())
return ExprError();
}
if (!RHSResult.isUsable())
return ExprError();
CondExpr = CondResult.get();
LHSExpr = LHSResult.get();
RHSExpr = RHSResult.get();
}
// If this is the gnu "x ?: y" extension, analyze the types as though the LHS
// was the condition.
OpaqueValueExpr *opaqueValue = nullptr;
Expr *commonExpr = nullptr;
if (!LHSExpr) {
commonExpr = CondExpr;
// Lower out placeholder types first. This is important so that we don't
// try to capture a placeholder. This happens in few cases in C++; such
// as Objective-C++'s dictionary subscripting syntax.
if (commonExpr->hasPlaceholderType()) {
ExprResult result = CheckPlaceholderExpr(commonExpr);
if (!result.isUsable()) return ExprError();
commonExpr = result.get();
}
// We usually want to apply unary conversions *before* saving, except
// in the special case of a C++ l-value conditional.
if (!(getLangOpts().CPlusPlus
&& !commonExpr->isTypeDependent()
&& commonExpr->getValueKind() == RHSExpr->getValueKind()
&& commonExpr->isGLValue()
&& commonExpr->isOrdinaryOrBitFieldObject()
&& RHSExpr->isOrdinaryOrBitFieldObject()
&& Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
ExprResult commonRes = UsualUnaryConversions(commonExpr);
if (commonRes.isInvalid())
return ExprError();
commonExpr = commonRes.get();
}
// If the common expression is a class or array prvalue, materialize it
// so that we can safely refer to it multiple times.
if (commonExpr->isPRValue() && (commonExpr->getType()->isRecordType() ||
commonExpr->getType()->isArrayType())) {
ExprResult MatExpr = TemporaryMaterializationConversion(commonExpr);
if (MatExpr.isInvalid())
return ExprError();
commonExpr = MatExpr.get();
}
opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
commonExpr->getType(),
commonExpr->getValueKind(),
commonExpr->getObjectKind(),
commonExpr);
LHSExpr = CondExpr = opaqueValue;
}
QualType LHSTy = LHSExpr->getType(), RHSTy = RHSExpr->getType();
ExprValueKind VK = VK_PRValue;
ExprObjectKind OK = OK_Ordinary;
ExprResult Cond = CondExpr, LHS = LHSExpr, RHS = RHSExpr;
QualType result = CheckConditionalOperands(Cond, LHS, RHS,
VK, OK, QuestionLoc);
if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
RHS.isInvalid())
return ExprError();
DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
RHS.get());
CheckBoolLikeConversion(Cond.get(), QuestionLoc);
result = computeConditionalNullability(result, commonExpr, LHSTy, RHSTy,
Context);
if (!commonExpr)
return new (Context)
ConditionalOperator(Cond.get(), QuestionLoc, LHS.get(), ColonLoc,
RHS.get(), result, VK, OK);
return new (Context) BinaryConditionalOperator(
commonExpr, opaqueValue, Cond.get(), LHS.get(), RHS.get(), QuestionLoc,
ColonLoc, result, VK, OK);
}
// Check that the SME attributes for PSTATE.ZA and PSTATE.SM are compatible.
bool Sema::IsInvalidSMECallConversion(QualType FromType, QualType ToType) {
unsigned FromAttributes = 0, ToAttributes = 0;
if (const auto *FromFn =
dyn_cast<FunctionProtoType>(Context.getCanonicalType(FromType)))
FromAttributes =
FromFn->getAArch64SMEAttributes() & FunctionType::SME_AttributeMask;
if (const auto *ToFn =
dyn_cast<FunctionProtoType>(Context.getCanonicalType(ToType)))
ToAttributes =
ToFn->getAArch64SMEAttributes() & FunctionType::SME_AttributeMask;
return FromAttributes != ToAttributes;
}
// Check if we have a conversion between incompatible cmse function pointer
// types, that is, a conversion between a function pointer with the
// cmse_nonsecure_call attribute and one without.
static bool IsInvalidCmseNSCallConversion(Sema &S, QualType FromType,
QualType ToType) {
if (const auto *ToFn =
dyn_cast<FunctionType>(S.Context.getCanonicalType(ToType))) {
if (const auto *FromFn =
dyn_cast<FunctionType>(S.Context.getCanonicalType(FromType))) {
FunctionType::ExtInfo ToEInfo = ToFn->getExtInfo();
FunctionType::ExtInfo FromEInfo = FromFn->getExtInfo();
return ToEInfo.getCmseNSCall() != FromEInfo.getCmseNSCall();
}
}
return false;
}
// checkPointerTypesForAssignment - This is a very tricky routine (despite
// being closely modeled after the C99 spec:-). The odd characteristic of this
// routine is it effectively iqnores the qualifiers on the top level pointee.
// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
// FIXME: add a couple examples in this comment.
static Sema::AssignConvertType
checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType,
SourceLocation Loc) {
assert(LHSType.isCanonical() && "LHS not canonicalized!");
assert(RHSType.isCanonical() && "RHS not canonicalized!");
// get the "pointed to" type (ignoring qualifiers at the top level)
const Type *lhptee, *rhptee;
Qualifiers lhq, rhq;
std::tie(lhptee, lhq) =
cast<PointerType>(LHSType)->getPointeeType().split().asPair();
std::tie(rhptee, rhq) =
cast<PointerType>(RHSType)->getPointeeType().split().asPair();
Sema::AssignConvertType ConvTy = Sema::Compatible;
// C99 6.5.16.1p1: This following citation is common to constraints
// 3 & 4 (below). ...and the type *pointed to* by the left has all the
// qualifiers of the type *pointed to* by the right;
// As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
lhq.compatiblyIncludesObjCLifetime(rhq)) {
// Ignore lifetime for further calculation.
lhq.removeObjCLifetime();
rhq.removeObjCLifetime();
}
if (!lhq.compatiblyIncludes(rhq)) {
// Treat address-space mismatches as fatal.
if (!lhq.isAddressSpaceSupersetOf(rhq))
return Sema::IncompatiblePointerDiscardsQualifiers;
// It's okay to add or remove GC or lifetime qualifiers when converting to
// and from void*.
else if (lhq.withoutObjCGCAttr().withoutObjCLifetime()
.compatiblyIncludes(
rhq.withoutObjCGCAttr().withoutObjCLifetime())
&& (lhptee->isVoidType() || rhptee->isVoidType()))
; // keep old
// Treat lifetime mismatches as fatal.
else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
// For GCC/MS compatibility, other qualifier mismatches are treated
// as still compatible in C.
else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
}
// C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
// incomplete type and the other is a pointer to a qualified or unqualified
// version of void...
if (lhptee->isVoidType()) {
if (rhptee->isIncompleteOrObjectType())
return ConvTy;
// As an extension, we allow cast to/from void* to function pointer.
assert(rhptee->isFunctionType());
return Sema::FunctionVoidPointer;
}
if (rhptee->isVoidType()) {
if (lhptee->isIncompleteOrObjectType())
return ConvTy;
// As an extension, we allow cast to/from void* to function pointer.
assert(lhptee->isFunctionType());
return Sema::FunctionVoidPointer;
}
if (!S.Diags.isIgnored(
diag::warn_typecheck_convert_incompatible_function_pointer_strict,
Loc) &&
RHSType->isFunctionPointerType() && LHSType->isFunctionPointerType() &&
!S.IsFunctionConversion(RHSType, LHSType, RHSType))
return Sema::IncompatibleFunctionPointerStrict;
// C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
// unqualified versions of compatible types, ...
QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
// Check if the pointee types are compatible ignoring the sign.
// We explicitly check for char so that we catch "char" vs
// "unsigned char" on systems where "char" is unsigned.
if (lhptee->isCharType())
ltrans = S.Context.UnsignedCharTy;
else if (lhptee->hasSignedIntegerRepresentation())
ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
if (rhptee->isCharType())
rtrans = S.Context.UnsignedCharTy;
else if (rhptee->hasSignedIntegerRepresentation())
rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
if (ltrans == rtrans) {
// Types are compatible ignoring the sign. Qualifier incompatibility
// takes priority over sign incompatibility because the sign
// warning can be disabled.
if (ConvTy != Sema::Compatible)
return ConvTy;
return Sema::IncompatiblePointerSign;
}
// If we are a multi-level pointer, it's possible that our issue is simply
// one of qualification - e.g. char ** -> const char ** is not allowed. If
// the eventual target type is the same and the pointers have the same
// level of indirection, this must be the issue.
if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
do {
std::tie(lhptee, lhq) =
cast<PointerType>(lhptee)->getPointeeType().split().asPair();
std::tie(rhptee, rhq) =
cast<PointerType>(rhptee)->getPointeeType().split().asPair();
// Inconsistent address spaces at this point is invalid, even if the
// address spaces would be compatible.
// FIXME: This doesn't catch address space mismatches for pointers of
// different nesting levels, like:
// __local int *** a;
// int ** b = a;
// It's not clear how to actually determine when such pointers are
// invalidly incompatible.
if (lhq.getAddressSpace() != rhq.getAddressSpace())
return Sema::IncompatibleNestedPointerAddressSpaceMismatch;
} while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
if (lhptee == rhptee)
return Sema::IncompatibleNestedPointerQualifiers;
}
// General pointer incompatibility takes priority over qualifiers.
if (RHSType->isFunctionPointerType() && LHSType->isFunctionPointerType())
return Sema::IncompatibleFunctionPointer;
return Sema::IncompatiblePointer;
}
if (!S.getLangOpts().CPlusPlus &&
S.IsFunctionConversion(ltrans, rtrans, ltrans))
return Sema::IncompatibleFunctionPointer;
if (IsInvalidCmseNSCallConversion(S, ltrans, rtrans))
return Sema::IncompatibleFunctionPointer;
if (S.IsInvalidSMECallConversion(rtrans, ltrans))
return Sema::IncompatibleFunctionPointer;
return ConvTy;
}
/// checkBlockPointerTypesForAssignment - This routine determines whether two
/// block pointer types are compatible or whether a block and normal pointer
/// are compatible. It is more restrict than comparing two function pointer
// types.
static Sema::AssignConvertType
checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
QualType RHSType) {
assert(LHSType.isCanonical() && "LHS not canonicalized!");
assert(RHSType.isCanonical() && "RHS not canonicalized!");
QualType lhptee, rhptee;
// get the "pointed to" type (ignoring qualifiers at the top level)
lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();
// In C++, the types have to match exactly.
if (S.getLangOpts().CPlusPlus)
return Sema::IncompatibleBlockPointer;
Sema::AssignConvertType ConvTy = Sema::Compatible;
// For blocks we enforce that qualifiers are identical.
Qualifiers LQuals = lhptee.getLocalQualifiers();
Qualifiers RQuals = rhptee.getLocalQualifiers();
if (S.getLangOpts().OpenCL) {
LQuals.removeAddressSpace();
RQuals.removeAddressSpace();
}
if (LQuals != RQuals)
ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
// FIXME: OpenCL doesn't define the exact compile time semantics for a block
// assignment.
// The current behavior is similar to C++ lambdas. A block might be
// assigned to a variable iff its return type and parameters are compatible
// (C99 6.2.7) with the corresponding return type and parameters of the LHS of
// an assignment. Presumably it should behave in way that a function pointer
// assignment does in C, so for each parameter and return type:
// * CVR and address space of LHS should be a superset of CVR and address
// space of RHS.
// * unqualified types should be compatible.
if (S.getLangOpts().OpenCL) {
if (!S.Context.typesAreBlockPointerCompatible(
S.Context.getQualifiedType(LHSType.getUnqualifiedType(), LQuals),
S.Context.getQualifiedType(RHSType.getUnqualifiedType(), RQuals)))
return Sema::IncompatibleBlockPointer;
} else if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
return Sema::IncompatibleBlockPointer;
return ConvTy;
}
/// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
/// for assignment compatibility.
static Sema::AssignConvertType
checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
QualType RHSType) {
assert(LHSType.isCanonical() && "LHS was not canonicalized!");
assert(RHSType.isCanonical() && "RHS was not canonicalized!");
if (LHSType->isObjCBuiltinType()) {
// Class is not compatible with ObjC object pointers.
if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
!RHSType->isObjCQualifiedClassType())
return Sema::IncompatiblePointer;
return Sema::Compatible;
}
if (RHSType->isObjCBuiltinType()) {
if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
!LHSType->isObjCQualifiedClassType())
return Sema::IncompatiblePointer;
return Sema::Compatible;
}
QualType lhptee = LHSType->castAs<ObjCObjectPointerType>()->getPointeeType();
QualType rhptee = RHSType->castAs<ObjCObjectPointerType>()->getPointeeType();
if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
// make an exception for id<P>
!LHSType->isObjCQualifiedIdType())
return Sema::CompatiblePointerDiscardsQualifiers;
if (S.Context.typesAreCompatible(LHSType, RHSType))
return Sema::Compatible;
if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
return Sema::IncompatibleObjCQualifiedId;
return Sema::IncompatiblePointer;
}
Sema::AssignConvertType
Sema::CheckAssignmentConstraints(SourceLocation Loc,
QualType LHSType, QualType RHSType) {
// Fake up an opaque expression. We don't actually care about what
// cast operations are required, so if CheckAssignmentConstraints
// adds casts to this they'll be wasted, but fortunately that doesn't
// usually happen on valid code.
OpaqueValueExpr RHSExpr(Loc, RHSType, VK_PRValue);
ExprResult RHSPtr = &RHSExpr;
CastKind K;
return CheckAssignmentConstraints(LHSType, RHSPtr, K, /*ConvertRHS=*/false);
}
/// This helper function returns true if QT is a vector type that has element
/// type ElementType.
static bool isVector(QualType QT, QualType ElementType) {
if (const VectorType *VT = QT->getAs<VectorType>())
return VT->getElementType().getCanonicalType() == ElementType;
return false;
}
/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
/// has code to accommodate several GCC extensions when type checking
/// pointers. Here are some objectionable examples that GCC considers warnings:
///
/// int a, *pint;
/// short *pshort;
/// struct foo *pfoo;
///
/// pint = pshort; // warning: assignment from incompatible pointer type
/// a = pint; // warning: assignment makes integer from pointer without a cast
/// pint = a; // warning: assignment makes pointer from integer without a cast
/// pint = pfoo; // warning: assignment from incompatible pointer type
///
/// As a result, the code for dealing with pointers is more complex than the
/// C99 spec dictates.
///
/// Sets 'Kind' for any result kind except Incompatible.
Sema::AssignConvertType
Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
CastKind &Kind, bool ConvertRHS) {
QualType RHSType = RHS.get()->getType();
QualType OrigLHSType = LHSType;
// Get canonical types. We're not formatting these types, just comparing
// them.
LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();
// Common case: no conversion required.
if (LHSType == RHSType) {
Kind = CK_NoOp;
return Compatible;
}
// If the LHS has an __auto_type, there are no additional type constraints
// to be worried about.
if (const auto *AT = dyn_cast<AutoType>(LHSType)) {
if (AT->isGNUAutoType()) {
Kind = CK_NoOp;
return Compatible;
}
}
// If we have an atomic type, try a non-atomic assignment, then just add an
// atomic qualification step.
if (const AtomicType *AtomicTy = dyn_cast<AtomicType>(LHSType)) {
Sema::AssignConvertType result =
CheckAssignmentConstraints(AtomicTy->getValueType(), RHS, Kind);
if (result != Compatible)
return result;
if (Kind != CK_NoOp && ConvertRHS)
RHS = ImpCastExprToType(RHS.get(), AtomicTy->getValueType(), Kind);
Kind = CK_NonAtomicToAtomic;
return Compatible;
}
// If the left-hand side is a reference type, then we are in a
// (rare!) case where we've allowed the use of references in C,
// e.g., as a parameter type in a built-in function. In this case,
// just make sure that the type referenced is compatible with the
// right-hand side type. The caller is responsible for adjusting
// LHSType so that the resulting expression does not have reference
// type.
if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
Kind = CK_LValueBitCast;
return Compatible;
}
return Incompatible;
}
// Allow scalar to ExtVector assignments, and assignments of an ExtVector type
// to the same ExtVector type.
if (LHSType->isExtVectorType()) {
if (RHSType->isExtVectorType())
return Incompatible;
if (RHSType->isArithmeticType()) {
// CK_VectorSplat does T -> vector T, so first cast to the element type.
if (ConvertRHS)
RHS = prepareVectorSplat(LHSType, RHS.get());
Kind = CK_VectorSplat;
return Compatible;
}
}
// Conversions to or from vector type.
if (LHSType->isVectorType() || RHSType->isVectorType()) {
if (LHSType->isVectorType() && RHSType->isVectorType()) {
// Allow assignments of an AltiVec vector type to an equivalent GCC
// vector type and vice versa
if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
Kind = CK_BitCast;
return Compatible;
}
// If we are allowing lax vector conversions, and LHS and RHS are both
// vectors, the total size only needs to be the same. This is a bitcast;
// no bits are changed but the result type is different.
if (isLaxVectorConversion(RHSType, LHSType)) {
// The default for lax vector conversions with Altivec vectors will
// change, so if we are converting between vector types where
// at least one is an Altivec vector, emit a warning.
if (Context.getTargetInfo().getTriple().isPPC() &&
anyAltivecTypes(RHSType, LHSType) &&
!Context.areCompatibleVectorTypes(RHSType, LHSType))
Diag(RHS.get()->getExprLoc(), diag::warn_deprecated_lax_vec_conv_all)
<< RHSType << LHSType;
Kind = CK_BitCast;
return IncompatibleVectors;
}
}
// When the RHS comes from another lax conversion (e.g. binops between
// scalars and vectors) the result is canonicalized as a vector. When the
// LHS is also a vector, the lax is allowed by the condition above. Handle
// the case where LHS is a scalar.
if (LHSType->isScalarType()) {
const VectorType *VecType = RHSType->getAs<VectorType>();
if (VecType && VecType->getNumElements() == 1 &&
isLaxVectorConversion(RHSType, LHSType)) {
if (Context.getTargetInfo().getTriple().isPPC() &&
(VecType->getVectorKind() == VectorKind::AltiVecVector ||
VecType->getVectorKind() == VectorKind::AltiVecBool ||
VecType->getVectorKind() == VectorKind::AltiVecPixel))
Diag(RHS.get()->getExprLoc(), diag::warn_deprecated_lax_vec_conv_all)
<< RHSType << LHSType;
ExprResult *VecExpr = &RHS;
*VecExpr = ImpCastExprToType(VecExpr->get(), LHSType, CK_BitCast);
Kind = CK_BitCast;
return Compatible;
}
}
// Allow assignments between fixed-length and sizeless SVE vectors.
if ((LHSType->isSVESizelessBuiltinType() && RHSType->isVectorType()) ||
(LHSType->isVectorType() && RHSType->isSVESizelessBuiltinType()))
if (Context.areCompatibleSveTypes(LHSType, RHSType) ||
Context.areLaxCompatibleSveTypes(LHSType, RHSType)) {
Kind = CK_BitCast;
return Compatible;
}
// Allow assignments between fixed-length and sizeless RVV vectors.
if ((LHSType->isRVVSizelessBuiltinType() && RHSType->isVectorType()) ||
(LHSType->isVectorType() && RHSType->isRVVSizelessBuiltinType())) {
if (Context.areCompatibleRVVTypes(LHSType, RHSType) ||
Context.areLaxCompatibleRVVTypes(LHSType, RHSType)) {
Kind = CK_BitCast;
return Compatible;
}
}
return Incompatible;
}
// Diagnose attempts to convert between __ibm128, __float128 and long double
// where such conversions currently can't be handled.
if (unsupportedTypeConversion(*this, LHSType, RHSType))
return Incompatible;
// Disallow assigning a _Complex to a real type in C++ mode since it simply
// discards the imaginary part.
if (getLangOpts().CPlusPlus && RHSType->getAs<ComplexType>() &&
!LHSType->getAs<ComplexType>())
return Incompatible;
// Arithmetic conversions.
if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
!(getLangOpts().CPlusPlus && LHSType->isEnumeralType())) {
if (ConvertRHS)
Kind = PrepareScalarCast(RHS, LHSType);
return Compatible;
}
// Conversions to normal pointers.
if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
// U* -> T*
if (isa<PointerType>(RHSType)) {
LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
LangAS AddrSpaceR = RHSType->getPointeeType().getAddressSpace();
if (AddrSpaceL != AddrSpaceR)
Kind = CK_AddressSpaceConversion;
else if (Context.hasCvrSimilarType(RHSType, LHSType))
Kind = CK_NoOp;
else
Kind = CK_BitCast;
return checkPointerTypesForAssignment(*this, LHSType, RHSType,
RHS.get()->getBeginLoc());
}
// int -> T*
if (RHSType->isIntegerType()) {
Kind = CK_IntegralToPointer; // FIXME: null?
return IntToPointer;
}
// C pointers are not compatible with ObjC object pointers,
// with two exceptions:
if (isa<ObjCObjectPointerType>(RHSType)) {
// - conversions to void*
if (LHSPointer->getPointeeType()->isVoidType()) {
Kind = CK_BitCast;
return Compatible;
}
// - conversions from 'Class' to the redefinition type
if (RHSType->isObjCClassType() &&
Context.hasSameType(LHSType,
Context.getObjCClassRedefinitionType())) {
Kind = CK_BitCast;
return Compatible;
}
Kind = CK_BitCast;
return IncompatiblePointer;
}
// U^ -> void*
if (RHSType->getAs<BlockPointerType>()) {
if (LHSPointer->getPointeeType()->isVoidType()) {
LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
->getPointeeType()
.getAddressSpace();
Kind =
AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
return Compatible;
}
}
return Incompatible;
}
// Conversions to block pointers.
if (isa<BlockPointerType>(LHSType)) {
// U^ -> T^
if (RHSType->isBlockPointerType()) {
LangAS AddrSpaceL = LHSType->getAs<BlockPointerType>()
->getPointeeType()
.getAddressSpace();
LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
->getPointeeType()
.getAddressSpace();
Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
}
// int or null -> T^
if (RHSType->isIntegerType()) {
Kind = CK_IntegralToPointer; // FIXME: null
return IntToBlockPointer;
}
// id -> T^
if (getLangOpts().ObjC && RHSType->isObjCIdType()) {
Kind = CK_AnyPointerToBlockPointerCast;
return Compatible;
}
// void* -> T^
if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
if (RHSPT->getPointeeType()->isVoidType()) {
Kind = CK_AnyPointerToBlockPointerCast;
return Compatible;
}
return Incompatible;
}
// Conversions to Objective-C pointers.
if (isa<ObjCObjectPointerType>(LHSType)) {
// A* -> B*
if (RHSType->isObjCObjectPointerType()) {
Kind = CK_BitCast;
Sema::AssignConvertType result =
checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
result == Compatible &&
!CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
result = IncompatibleObjCWeakRef;
return result;
}
// int or null -> A*
if (RHSType->isIntegerType()) {
Kind = CK_IntegralToPointer; // FIXME: null
return IntToPointer;
}
// In general, C pointers are not compatible with ObjC object pointers,
// with two exceptions:
if (isa<PointerType>(RHSType)) {
Kind = CK_CPointerToObjCPointerCast;
// - conversions from 'void*'
if (RHSType->isVoidPointerType()) {
return Compatible;
}
// - conversions to 'Class' from its redefinition type
if (LHSType->isObjCClassType() &&
Context.hasSameType(RHSType,
Context.getObjCClassRedefinitionType())) {
return Compatible;
}
return IncompatiblePointer;
}
// Only under strict condition T^ is compatible with an Objective-C pointer.
if (RHSType->isBlockPointerType() &&
LHSType->isBlockCompatibleObjCPointerType(Context)) {
if (ConvertRHS)
maybeExtendBlockObject(RHS);
Kind = CK_BlockPointerToObjCPointerCast;
return Compatible;
}
return Incompatible;
}
// Conversion to nullptr_t (C23 only)
if (getLangOpts().C23 && LHSType->isNullPtrType() &&
RHS.get()->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNull)) {
// null -> nullptr_t
Kind = CK_NullToPointer;
return Compatible;
}
// Conversions from pointers that are not covered by the above.
if (isa<PointerType>(RHSType)) {
// T* -> _Bool
if (LHSType == Context.BoolTy) {
Kind = CK_PointerToBoolean;
return Compatible;
}
// T* -> int
if (LHSType->isIntegerType()) {
Kind = CK_PointerToIntegral;
return PointerToInt;
}
return Incompatible;
}
// Conversions from Objective-C pointers that are not covered by the above.
if (isa<ObjCObjectPointerType>(RHSType)) {
// T* -> _Bool
if (LHSType == Context.BoolTy) {
Kind = CK_PointerToBoolean;
return Compatible;
}
// T* -> int
if (LHSType->isIntegerType()) {
Kind = CK_PointerToIntegral;
return PointerToInt;
}
return Incompatible;
}
// struct A -> struct B
if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
if (Context.typesAreCompatible(LHSType, RHSType)) {
Kind = CK_NoOp;
return Compatible;
}
}
if (LHSType->isSamplerT() && RHSType->isIntegerType()) {
Kind = CK_IntToOCLSampler;
return Compatible;
}
return Incompatible;
}
/// Constructs a transparent union from an expression that is
/// used to initialize the transparent union.
static void ConstructTransparentUnion(Sema &S, ASTContext &C,
ExprResult &EResult, QualType UnionType,
FieldDecl *Field) {
// Build an initializer list that designates the appropriate member
// of the transparent union.
Expr *E = EResult.get();
InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
E, SourceLocation());
Initializer->setType(UnionType);
Initializer->setInitializedFieldInUnion(Field);
// Build a compound literal constructing a value of the transparent
// union type from this initializer list.
TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
EResult = new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
VK_PRValue, Initializer, false);
}
Sema::AssignConvertType
Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
ExprResult &RHS) {
QualType RHSType = RHS.get()->getType();
// If the ArgType is a Union type, we want to handle a potential
// transparent_union GCC extension.
const RecordType *UT = ArgType->getAsUnionType();
if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
return Incompatible;
// The field to initialize within the transparent union.
RecordDecl *UD = UT->getDecl();
FieldDecl *InitField = nullptr;
// It's compatible if the expression matches any of the fields.
for (auto *it : UD->fields()) {
if (it->getType()->isPointerType()) {
// If the transparent union contains a pointer type, we allow:
// 1) void pointer
// 2) null pointer constant
if (RHSType->isPointerType())
if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
RHS = ImpCastExprToType(RHS.get(), it->getType(), CK_BitCast);
InitField = it;
break;
}
if (RHS.get()->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNull)) {
RHS = ImpCastExprToType(RHS.get(), it->getType(),
CK_NullToPointer);
InitField = it;
break;
}
}
CastKind Kind;
if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
== Compatible) {
RHS = ImpCastExprToType(RHS.get(), it->getType(), Kind);
InitField = it;
break;
}
}
if (!InitField)
return Incompatible;
ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
return Compatible;
}
Sema::AssignConvertType
Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &CallerRHS,
bool Diagnose,
bool DiagnoseCFAudited,
bool ConvertRHS) {
// We need to be able to tell the caller whether we diagnosed a problem, if
// they ask us to issue diagnostics.
assert((ConvertRHS || !Diagnose) && "can't indicate whether we diagnosed");
// If ConvertRHS is false, we want to leave the caller's RHS untouched. Sadly,
// we can't avoid *all* modifications at the moment, so we need some somewhere
// to put the updated value.
ExprResult LocalRHS = CallerRHS;
ExprResult &RHS = ConvertRHS ? CallerRHS : LocalRHS;
if (const auto *LHSPtrType = LHSType->getAs<PointerType>()) {
if (const auto *RHSPtrType = RHS.get()->getType()->getAs<PointerType>()) {
if (RHSPtrType->getPointeeType()->hasAttr(attr::NoDeref) &&
!LHSPtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
Diag(RHS.get()->getExprLoc(),
diag::warn_noderef_to_dereferenceable_pointer)
<< RHS.get()->getSourceRange();
}
}
}
if (getLangOpts().CPlusPlus) {
if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
// C++ 5.17p3: If the left operand is not of class type, the
// expression is implicitly converted (C++ 4) to the
// cv-unqualified type of the left operand.
QualType RHSType = RHS.get()->getType();
if (Diagnose) {
RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
AA_Assigning);
} else {
ImplicitConversionSequence ICS =
TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
/*SuppressUserConversions=*/false,
AllowedExplicit::None,
/*InOverloadResolution=*/false,
/*CStyle=*/false,
/*AllowObjCWritebackConversion=*/false);
if (ICS.isFailure())
return Incompatible;
RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
ICS, AA_Assigning);
}
if (RHS.isInvalid())
return Incompatible;
Sema::AssignConvertType result = Compatible;
if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
!CheckObjCARCUnavailableWeakConversion(LHSType, RHSType))
result = IncompatibleObjCWeakRef;
return result;
}
// FIXME: Currently, we fall through and treat C++ classes like C
// structures.
// FIXME: We also fall through for atomics; not sure what should
// happen there, though.
} else if (RHS.get()->getType() == Context.OverloadTy) {
// As a set of extensions to C, we support overloading on functions. These
// functions need to be resolved here.
DeclAccessPair DAP;
if (FunctionDecl *FD = ResolveAddressOfOverloadedFunction(
RHS.get(), LHSType, /*Complain=*/false, DAP))
RHS = FixOverloadedFunctionReference(RHS.get(), DAP, FD);
else
return Incompatible;
}
// This check seems unnatural, however it is necessary to ensure the proper
// conversion of functions/arrays. If the conversion were done for all
// DeclExpr's (created by ActOnIdExpression), it would mess up the unary
// expressions that suppress this implicit conversion (&, sizeof). This needs
// to happen before we check for null pointer conversions because C does not
// undergo the same implicit conversions as C++ does above (by the calls to
// TryImplicitConversion() and PerformImplicitConversion()) which insert the
// lvalue to rvalue cast before checking for null pointer constraints. This
// addresses code like: nullptr_t val; int *ptr; ptr = val;
//
// Suppress this for references: C++ 8.5.3p5.
if (!LHSType->isReferenceType()) {
// FIXME: We potentially allocate here even if ConvertRHS is false.
RHS = DefaultFunctionArrayLvalueConversion(RHS.get(), Diagnose);
if (RHS.isInvalid())
return Incompatible;
}
// The constraints are expressed in terms of the atomic, qualified, or
// unqualified type of the LHS.
QualType LHSTypeAfterConversion = LHSType.getAtomicUnqualifiedType();
// C99 6.5.16.1p1: the left operand is a pointer and the right is
// a null pointer constant <C23>or its type is nullptr_t;</C23>.
if ((LHSTypeAfterConversion->isPointerType() ||
LHSTypeAfterConversion->isObjCObjectPointerType() ||
LHSTypeAfterConversion->isBlockPointerType()) &&
((getLangOpts().C23 && RHS.get()->getType()->isNullPtrType()) ||
RHS.get()->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNull))) {
if (Diagnose || ConvertRHS) {
CastKind Kind;
CXXCastPath Path;
CheckPointerConversion(RHS.get(), LHSType, Kind, Path,
/*IgnoreBaseAccess=*/false, Diagnose);
if (ConvertRHS)
RHS = ImpCastExprToType(RHS.get(), LHSType, Kind, VK_PRValue, &Path);
}
return Compatible;
}
// C23 6.5.16.1p1: the left operand has type atomic, qualified, or
// unqualified bool, and the right operand is a pointer or its type is
// nullptr_t.
if (getLangOpts().C23 && LHSType->isBooleanType() &&
RHS.get()->getType()->isNullPtrType()) {
// NB: T* -> _Bool is handled in CheckAssignmentConstraints, this only
// only handles nullptr -> _Bool due to needing an extra conversion
// step.
// We model this by converting from nullptr -> void * and then let the
// conversion from void * -> _Bool happen naturally.
if (Diagnose || ConvertRHS) {
CastKind Kind;
CXXCastPath Path;
CheckPointerConversion(RHS.get(), Context.VoidPtrTy, Kind, Path,
/*IgnoreBaseAccess=*/false, Diagnose);
if (ConvertRHS)
RHS = ImpCastExprToType(RHS.get(), Context.VoidPtrTy, Kind, VK_PRValue,
&Path);
}
}
// OpenCL queue_t type assignment.
if (LHSType->isQueueT() && RHS.get()->isNullPointerConstant(
Context, Expr::NPC_ValueDependentIsNull)) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
return Compatible;
}
CastKind Kind;
Sema::AssignConvertType result =
CheckAssignmentConstraints(LHSType, RHS, Kind, ConvertRHS);
// C99 6.5.16.1p2: The value of the right operand is converted to the
// type of the assignment expression.
// CheckAssignmentConstraints allows the left-hand side to be a reference,
// so that we can use references in built-in functions even in C.
// The getNonReferenceType() call makes sure that the resulting expression
// does not have reference type.
if (result != Incompatible && RHS.get()->getType() != LHSType) {
QualType Ty = LHSType.getNonLValueExprType(Context);
Expr *E = RHS.get();
// Check for various Objective-C errors. If we are not reporting
// diagnostics and just checking for errors, e.g., during overload
// resolution, return Incompatible to indicate the failure.
if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
CheckObjCConversion(SourceRange(), Ty, E, CCK_ImplicitConversion,
Diagnose, DiagnoseCFAudited) != ACR_okay) {
if (!Diagnose)
return Incompatible;
}
if (getLangOpts().ObjC &&
(CheckObjCBridgeRelatedConversions(E->getBeginLoc(), LHSType,
E->getType(), E, Diagnose) ||
CheckConversionToObjCLiteral(LHSType, E, Diagnose))) {
if (!Diagnose)
return Incompatible;
// Replace the expression with a corrected version and continue so we
// can find further errors.
RHS = E;
return Compatible;
}
if (ConvertRHS)
RHS = ImpCastExprToType(E, Ty, Kind);
}
return result;
}
namespace {
/// The original operand to an operator, prior to the application of the usual
/// arithmetic conversions and converting the arguments of a builtin operator
/// candidate.
struct OriginalOperand {
explicit OriginalOperand(Expr *Op) : Orig(Op), Conversion(nullptr) {
if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Op))
Op = MTE->getSubExpr();
if (auto *BTE = dyn_cast<CXXBindTemporaryExpr>(Op))
Op = BTE->getSubExpr();
if (auto *ICE = dyn_cast<ImplicitCastExpr>(Op)) {
Orig = ICE->getSubExprAsWritten();
Conversion = ICE->getConversionFunction();
}
}
QualType getType() const { return Orig->getType(); }
Expr *Orig;
NamedDecl *Conversion;
};
}
QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
ExprResult &RHS) {
OriginalOperand OrigLHS(LHS.get()), OrigRHS(RHS.get());
Diag(Loc, diag::err_typecheck_invalid_operands)
<< OrigLHS.getType() << OrigRHS.getType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
// If a user-defined conversion was applied to either of the operands prior
// to applying the built-in operator rules, tell the user about it.
if (OrigLHS.Conversion) {
Diag(OrigLHS.Conversion->getLocation(),
diag::note_typecheck_invalid_operands_converted)
<< 0 << LHS.get()->getType();
}
if (OrigRHS.Conversion) {
Diag(OrigRHS.Conversion->getLocation(),
diag::note_typecheck_invalid_operands_converted)
<< 1 << RHS.get()->getType();
}
return QualType();
}
// Diagnose cases where a scalar was implicitly converted to a vector and
// diagnose the underlying types. Otherwise, diagnose the error
// as invalid vector logical operands for non-C++ cases.
QualType Sema::InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
ExprResult &RHS) {
QualType LHSType = LHS.get()->IgnoreImpCasts()->getType();
QualType RHSType = RHS.get()->IgnoreImpCasts()->getType();
bool LHSNatVec = LHSType->isVectorType();
bool RHSNatVec = RHSType->isVectorType();
if (!(LHSNatVec && RHSNatVec)) {
Expr *Vector = LHSNatVec ? LHS.get() : RHS.get();
Expr *NonVector = !LHSNatVec ? LHS.get() : RHS.get();
Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
<< 0 << Vector->getType() << NonVector->IgnoreImpCasts()->getType()
<< Vector->getSourceRange();
return QualType();
}
Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
<< 1 << LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
/// Try to convert a value of non-vector type to a vector type by converting
/// the type to the element type of the vector and then performing a splat.
/// If the language is OpenCL, we only use conversions that promote scalar
/// rank; for C, Obj-C, and C++ we allow any real scalar conversion except
/// for float->int.
///
/// OpenCL V2.0 6.2.6.p2:
/// An error shall occur if any scalar operand type has greater rank
/// than the type of the vector element.
///
/// \param scalar - if non-null, actually perform the conversions
/// \return true if the operation fails (but without diagnosing the failure)
static bool tryVectorConvertAndSplat(Sema &S, ExprResult *scalar,
QualType scalarTy,
QualType vectorEltTy,
QualType vectorTy,
unsigned &DiagID) {
// The conversion to apply to the scalar before splatting it,
// if necessary.
CastKind scalarCast = CK_NoOp;
if (vectorEltTy->isIntegralType(S.Context)) {
if (S.getLangOpts().OpenCL && (scalarTy->isRealFloatingType() ||
(scalarTy->isIntegerType() &&
S.Context.getIntegerTypeOrder(vectorEltTy, scalarTy) < 0))) {
DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
return true;
}
if (!scalarTy->isIntegralType(S.Context))
return true;
scalarCast = CK_IntegralCast;
} else if (vectorEltTy->isRealFloatingType()) {
if (scalarTy->isRealFloatingType()) {
if (S.getLangOpts().OpenCL &&
S.Context.getFloatingTypeOrder(vectorEltTy, scalarTy) < 0) {
DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
return true;
}
scalarCast = CK_FloatingCast;
}
else if (scalarTy->isIntegralType(S.Context))
scalarCast = CK_IntegralToFloating;
else
return true;
} else {
return true;
}
// Adjust scalar if desired.
if (scalar) {
if (scalarCast != CK_NoOp)
*scalar = S.ImpCastExprToType(scalar->get(), vectorEltTy, scalarCast);
*scalar = S.ImpCastExprToType(scalar->get(), vectorTy, CK_VectorSplat);
}
return false;
}
/// Convert vector E to a vector with the same number of elements but different
/// element type.
static ExprResult convertVector(Expr *E, QualType ElementType, Sema &S) {
const auto *VecTy = E->getType()->getAs<VectorType>();
assert(VecTy && "Expression E must be a vector");
QualType NewVecTy =
VecTy->isExtVectorType()
? S.Context.getExtVectorType(ElementType, VecTy->getNumElements())
: S.Context.getVectorType(ElementType, VecTy->getNumElements(),
VecTy->getVectorKind());
// Look through the implicit cast. Return the subexpression if its type is
// NewVecTy.
if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
if (ICE->getSubExpr()->getType() == NewVecTy)
return ICE->getSubExpr();
auto Cast = ElementType->isIntegerType() ? CK_IntegralCast : CK_FloatingCast;
return S.ImpCastExprToType(E, NewVecTy, Cast);
}
/// Test if a (constant) integer Int can be casted to another integer type
/// IntTy without losing precision.
static bool canConvertIntToOtherIntTy(Sema &S, ExprResult *Int,
QualType OtherIntTy) {
QualType IntTy = Int->get()->getType().getUnqualifiedType();
// Reject cases where the value of the Int is unknown as that would
// possibly cause truncation, but accept cases where the scalar can be
// demoted without loss of precision.
Expr::EvalResult EVResult;
bool CstInt = Int->get()->EvaluateAsInt(EVResult, S.Context);
int Order = S.Context.getIntegerTypeOrder(OtherIntTy, IntTy);
bool IntSigned = IntTy->hasSignedIntegerRepresentation();
bool OtherIntSigned = OtherIntTy->hasSignedIntegerRepresentation();
if (CstInt) {
// If the scalar is constant and is of a higher order and has more active
// bits that the vector element type, reject it.
llvm::APSInt Result = EVResult.Val.getInt();
unsigned NumBits = IntSigned
? (Result.isNegative() ? Result.getSignificantBits()
: Result.getActiveBits())
: Result.getActiveBits();
if (Order < 0 && S.Context.getIntWidth(OtherIntTy) < NumBits)
return true;
// If the signedness of the scalar type and the vector element type
// differs and the number of bits is greater than that of the vector
// element reject it.
return (IntSigned != OtherIntSigned &&
NumBits > S.Context.getIntWidth(OtherIntTy));
}
// Reject cases where the value of the scalar is not constant and it's
// order is greater than that of the vector element type.
return (Order < 0);
}
/// Test if a (constant) integer Int can be casted to floating point type
/// FloatTy without losing precision.
static bool canConvertIntTyToFloatTy(Sema &S, ExprResult *Int,
QualType FloatTy) {
QualType IntTy = Int->get()->getType().getUnqualifiedType();
// Determine if the integer constant can be expressed as a floating point
// number of the appropriate type.
Expr::EvalResult EVResult;
bool CstInt = Int->get()->EvaluateAsInt(EVResult, S.Context);
uint64_t Bits = 0;
if (CstInt) {
// Reject constants that would be truncated if they were converted to
// the floating point type. Test by simple to/from conversion.
// FIXME: Ideally the conversion to an APFloat and from an APFloat
// could be avoided if there was a convertFromAPInt method
// which could signal back if implicit truncation occurred.
llvm::APSInt Result = EVResult.Val.getInt();
llvm::APFloat Float(S.Context.getFloatTypeSemantics(FloatTy));
Float.convertFromAPInt(Result, IntTy->hasSignedIntegerRepresentation(),
llvm::APFloat::rmTowardZero);
llvm::APSInt ConvertBack(S.Context.getIntWidth(IntTy),
!IntTy->hasSignedIntegerRepresentation());
bool Ignored = false;
Float.convertToInteger(ConvertBack, llvm::APFloat::rmNearestTiesToEven,
&Ignored);
if (Result != ConvertBack)
return true;
} else {
// Reject types that cannot be fully encoded into the mantissa of
// the float.
Bits = S.Context.getTypeSize(IntTy);
unsigned FloatPrec = llvm::APFloat::semanticsPrecision(
S.Context.getFloatTypeSemantics(FloatTy));
if (Bits > FloatPrec)
return true;
}
return false;
}
/// Attempt to convert and splat Scalar into a vector whose types matches
/// Vector following GCC conversion rules. The rule is that implicit
/// conversion can occur when Scalar can be casted to match Vector's element
/// type without causing truncation of Scalar.
static bool tryGCCVectorConvertAndSplat(Sema &S, ExprResult *Scalar,
ExprResult *Vector) {
QualType ScalarTy = Scalar->get()->getType().getUnqualifiedType();
QualType VectorTy = Vector->get()->getType().getUnqualifiedType();
QualType VectorEltTy;
if (const auto *VT = VectorTy->getAs<VectorType>()) {
assert(!isa<ExtVectorType>(VT) &&
"ExtVectorTypes should not be handled here!");
VectorEltTy = VT->getElementType();
} else if (VectorTy->isSveVLSBuiltinType()) {
VectorEltTy =
VectorTy->castAs<BuiltinType>()->getSveEltType(S.getASTContext());
} else {
llvm_unreachable("Only Fixed-Length and SVE Vector types are handled here");
}
// Reject cases where the vector element type or the scalar element type are
// not integral or floating point types.
if (!VectorEltTy->isArithmeticType() || !ScalarTy->isArithmeticType())
return true;
// The conversion to apply to the scalar before splatting it,
// if necessary.
CastKind ScalarCast = CK_NoOp;
// Accept cases where the vector elements are integers and the scalar is
// an integer.
// FIXME: Notionally if the scalar was a floating point value with a precise
// integral representation, we could cast it to an appropriate integer
// type and then perform the rest of the checks here. GCC will perform
// this conversion in some cases as determined by the input language.
// We should accept it on a language independent basis.
if (VectorEltTy->isIntegralType(S.Context) &&
ScalarTy->isIntegralType(S.Context) &&
S.Context.getIntegerTypeOrder(VectorEltTy, ScalarTy)) {
if (canConvertIntToOtherIntTy(S, Scalar, VectorEltTy))
return true;
ScalarCast = CK_IntegralCast;
} else if (VectorEltTy->isIntegralType(S.Context) &&
ScalarTy->isRealFloatingType()) {
if (S.Context.getTypeSize(VectorEltTy) == S.Context.getTypeSize(ScalarTy))
ScalarCast = CK_FloatingToIntegral;
else
return true;
} else if (VectorEltTy->isRealFloatingType()) {
if (ScalarTy->isRealFloatingType()) {
// Reject cases where the scalar type is not a constant and has a higher
// Order than the vector element type.
llvm::APFloat Result(0.0);
// Determine whether this is a constant scalar. In the event that the
// value is dependent (and thus cannot be evaluated by the constant
// evaluator), skip the evaluation. This will then diagnose once the
// expression is instantiated.
bool CstScalar = Scalar->get()->isValueDependent() ||
Scalar->get()->EvaluateAsFloat(Result, S.Context);
int Order = S.Context.getFloatingTypeOrder(VectorEltTy, ScalarTy);
if (!CstScalar && Order < 0)
return true;
// If the scalar cannot be safely casted to the vector element type,
// reject it.
if (CstScalar) {
bool Truncated = false;
Result.convert(S.Context.getFloatTypeSemantics(VectorEltTy),
llvm::APFloat::rmNearestTiesToEven, &Truncated);
if (Truncated)
return true;
}
ScalarCast = CK_FloatingCast;
} else if (ScalarTy->isIntegralType(S.Context)) {
if (canConvertIntTyToFloatTy(S, Scalar, VectorEltTy))
return true;
ScalarCast = CK_IntegralToFloating;
} else
return true;
} else if (ScalarTy->isEnumeralType())
return true;
// Adjust scalar if desired.
if (ScalarCast != CK_NoOp)
*Scalar = S.ImpCastExprToType(Scalar->get(), VectorEltTy, ScalarCast);
*Scalar = S.ImpCastExprToType(Scalar->get(), VectorTy, CK_VectorSplat);
return false;
}
QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc, bool IsCompAssign,
bool AllowBothBool,
bool AllowBoolConversions,
bool AllowBoolOperation,
bool ReportInvalid) {
if (!IsCompAssign) {
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
}
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType = LHS.get()->getType().getUnqualifiedType();
QualType RHSType = RHS.get()->getType().getUnqualifiedType();
const VectorType *LHSVecType = LHSType->getAs<VectorType>();
const VectorType *RHSVecType = RHSType->getAs<VectorType>();
assert(LHSVecType || RHSVecType);
// AltiVec-style "vector bool op vector bool" combinations are allowed
// for some operators but not others.
if (!AllowBothBool && LHSVecType &&
LHSVecType->getVectorKind() == VectorKind::AltiVecBool && RHSVecType &&
RHSVecType->getVectorKind() == VectorKind::AltiVecBool)
return ReportInvalid ? InvalidOperands(Loc, LHS, RHS) : QualType();
// This operation may not be performed on boolean vectors.
if (!AllowBoolOperation &&
(LHSType->isExtVectorBoolType() || RHSType->isExtVectorBoolType()))
return ReportInvalid ? InvalidOperands(Loc, LHS, RHS) : QualType();
// If the vector types are identical, return.
if (Context.hasSameType(LHSType, RHSType))
return Context.getCommonSugaredType(LHSType, RHSType);
// If we have compatible AltiVec and GCC vector types, use the AltiVec type.
if (LHSVecType && RHSVecType &&
Context.areCompatibleVectorTypes(LHSType, RHSType)) {
if (isa<ExtVectorType>(LHSVecType)) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
return LHSType;
}
if (!IsCompAssign)
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
return RHSType;
}
// AllowBoolConversions says that bool and non-bool AltiVec vectors
// can be mixed, with the result being the non-bool type. The non-bool
// operand must have integer element type.
if (AllowBoolConversions && LHSVecType && RHSVecType &&
LHSVecType->getNumElements() == RHSVecType->getNumElements() &&
(Context.getTypeSize(LHSVecType->getElementType()) ==
Context.getTypeSize(RHSVecType->getElementType()))) {
if (LHSVecType->getVectorKind() == VectorKind::AltiVecVector &&
LHSVecType->getElementType()->isIntegerType() &&
RHSVecType->getVectorKind() == VectorKind::AltiVecBool) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
return LHSType;
}
if (!IsCompAssign &&
LHSVecType->getVectorKind() == VectorKind::AltiVecBool &&
RHSVecType->getVectorKind() == VectorKind::AltiVecVector &&
RHSVecType->getElementType()->isIntegerType()) {
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
return RHSType;
}
}
// Expressions containing fixed-length and sizeless SVE/RVV vectors are
// invalid since the ambiguity can affect the ABI.
auto IsSveRVVConversion = [](QualType FirstType, QualType SecondType,
unsigned &SVEorRVV) {
const VectorType *VecType = SecondType->getAs<VectorType>();
SVEorRVV = 0;
if (FirstType->isSizelessBuiltinType() && VecType) {
if (VecType->getVectorKind() == VectorKind::SveFixedLengthData ||
VecType->getVectorKind() == VectorKind::SveFixedLengthPredicate)
return true;
if (VecType->getVectorKind() == VectorKind::RVVFixedLengthData ||
VecType->getVectorKind() == VectorKind::RVVFixedLengthMask) {
SVEorRVV = 1;
return true;
}
}
return false;
};
unsigned SVEorRVV;
if (IsSveRVVConversion(LHSType, RHSType, SVEorRVV) ||
IsSveRVVConversion(RHSType, LHSType, SVEorRVV)) {
Diag(Loc, diag::err_typecheck_sve_rvv_ambiguous)
<< SVEorRVV << LHSType << RHSType;
return QualType();
}
// Expressions containing GNU and SVE or RVV (fixed or sizeless) vectors are
// invalid since the ambiguity can affect the ABI.
auto IsSveRVVGnuConversion = [](QualType FirstType, QualType SecondType,
unsigned &SVEorRVV) {
const VectorType *FirstVecType = FirstType->getAs<VectorType>();
const VectorType *SecondVecType = SecondType->getAs<VectorType>();
SVEorRVV = 0;
if (FirstVecType && SecondVecType) {
if (FirstVecType->getVectorKind() == VectorKind::Generic) {
if (SecondVecType->getVectorKind() == VectorKind::SveFixedLengthData ||
SecondVecType->getVectorKind() ==
VectorKind::SveFixedLengthPredicate)
return true;
if (SecondVecType->getVectorKind() == VectorKind::RVVFixedLengthData ||
SecondVecType->getVectorKind() == VectorKind::RVVFixedLengthMask) {
SVEorRVV = 1;
return true;
}
}
return false;
}
if (SecondVecType &&
SecondVecType->getVectorKind() == VectorKind::Generic) {
if (FirstType->isSVESizelessBuiltinType())
return true;
if (FirstType->isRVVSizelessBuiltinType()) {
SVEorRVV = 1;
return true;
}
}
return false;
};
if (IsSveRVVGnuConversion(LHSType, RHSType, SVEorRVV) ||
IsSveRVVGnuConversion(RHSType, LHSType, SVEorRVV)) {
Diag(Loc, diag::err_typecheck_sve_rvv_gnu_ambiguous)
<< SVEorRVV << LHSType << RHSType;
return QualType();
}
// If there's a vector type and a scalar, try to convert the scalar to
// the vector element type and splat.
unsigned DiagID = diag::err_typecheck_vector_not_convertable;
if (!RHSVecType) {
if (isa<ExtVectorType>(LHSVecType)) {
if (!tryVectorConvertAndSplat(*this, &RHS, RHSType,
LHSVecType->getElementType(), LHSType,
DiagID))
return LHSType;
} else {
if (!tryGCCVectorConvertAndSplat(*this, &RHS, &LHS))
return LHSType;
}
}
if (!LHSVecType) {
if (isa<ExtVectorType>(RHSVecType)) {
if (!tryVectorConvertAndSplat(*this, (IsCompAssign ? nullptr : &LHS),
LHSType, RHSVecType->getElementType(),
RHSType, DiagID))
return RHSType;
} else {
if (LHS.get()->isLValue() ||
!tryGCCVectorConvertAndSplat(*this, &LHS, &RHS))
return RHSType;
}
}
// FIXME: The code below also handles conversion between vectors and
// non-scalars, we should break this down into fine grained specific checks
// and emit proper diagnostics.
QualType VecType = LHSVecType ? LHSType : RHSType;
const VectorType *VT = LHSVecType ? LHSVecType : RHSVecType;
QualType OtherType = LHSVecType ? RHSType : LHSType;
ExprResult *OtherExpr = LHSVecType ? &RHS : &LHS;
if (isLaxVectorConversion(OtherType, VecType)) {
if (Context.getTargetInfo().getTriple().isPPC() &&
anyAltivecTypes(RHSType, LHSType) &&
!Context.areCompatibleVectorTypes(RHSType, LHSType))
Diag(Loc, diag::warn_deprecated_lax_vec_conv_all) << RHSType << LHSType;
// If we're allowing lax vector conversions, only the total (data) size
// needs to be the same. For non compound assignment, if one of the types is
// scalar, the result is always the vector type.
if (!IsCompAssign) {
*OtherExpr = ImpCastExprToType(OtherExpr->get(), VecType, CK_BitCast);
return VecType;
// In a compound assignment, lhs += rhs, 'lhs' is a lvalue src, forbidding
// any implicit cast. Here, the 'rhs' should be implicit casted to 'lhs'
// type. Note that this is already done by non-compound assignments in
// CheckAssignmentConstraints. If it's a scalar type, only bitcast for
// <1 x T> -> T. The result is also a vector type.
} else if (OtherType->isExtVectorType() || OtherType->isVectorType() ||
(OtherType->isScalarType() && VT->getNumElements() == 1)) {
ExprResult *RHSExpr = &RHS;
*RHSExpr = ImpCastExprToType(RHSExpr->get(), LHSType, CK_BitCast);
return VecType;
}
}
// Okay, the expression is invalid.
// If there's a non-vector, non-real operand, diagnose that.
if ((!RHSVecType && !RHSType->isRealType()) ||
(!LHSVecType && !LHSType->isRealType())) {
Diag(Loc, diag::err_typecheck_vector_not_convertable_non_scalar)
<< LHSType << RHSType
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
}
// OpenCL V1.1 6.2.6.p1:
// If the operands are of more than one vector type, then an error shall
// occur. Implicit conversions between vector types are not permitted, per
// section 6.2.1.
if (getLangOpts().OpenCL &&
RHSVecType && isa<ExtVectorType>(RHSVecType) &&
LHSVecType && isa<ExtVectorType>(LHSVecType)) {
Diag(Loc, diag::err_opencl_implicit_vector_conversion) << LHSType
<< RHSType;
return QualType();
}
// If there is a vector type that is not a ExtVector and a scalar, we reach
// this point if scalar could not be converted to the vector's element type
// without truncation.
if ((RHSVecType && !isa<ExtVectorType>(RHSVecType)) ||
(LHSVecType && !isa<ExtVectorType>(LHSVecType))) {
QualType Scalar = LHSVecType ? RHSType : LHSType;
QualType Vector = LHSVecType ? LHSType : RHSType;
unsigned ScalarOrVector = LHSVecType && RHSVecType ? 1 : 0;
Diag(Loc,
diag::err_typecheck_vector_not_convertable_implict_truncation)
<< ScalarOrVector << Scalar << Vector;
return QualType();
}
// Otherwise, use the generic diagnostic.
Diag(Loc, DiagID)
<< LHSType << RHSType
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
}
QualType Sema::CheckSizelessVectorOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
bool IsCompAssign,
ArithConvKind OperationKind) {
if (!IsCompAssign) {
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
}
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
QualType LHSType = LHS.get()->getType().getUnqualifiedType();
QualType RHSType = RHS.get()->getType().getUnqualifiedType();
const BuiltinType *LHSBuiltinTy = LHSType->getAs<BuiltinType>();
const BuiltinType *RHSBuiltinTy = RHSType->getAs<BuiltinType>();
unsigned DiagID = diag::err_typecheck_invalid_operands;
if ((OperationKind == ACK_Arithmetic) &&
((LHSBuiltinTy && LHSBuiltinTy->isSVEBool()) ||
(RHSBuiltinTy && RHSBuiltinTy->isSVEBool()))) {
Diag(Loc, DiagID) << LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
if (Context.hasSameType(LHSType, RHSType))
return LHSType;
if (LHSType->isSveVLSBuiltinType() && !RHSType->isSveVLSBuiltinType()) {
if (!tryGCCVectorConvertAndSplat(*this, &RHS, &LHS))
return LHSType;
}
if (RHSType->isSveVLSBuiltinType() && !LHSType->isSveVLSBuiltinType()) {
if (LHS.get()->isLValue() ||
!tryGCCVectorConvertAndSplat(*this, &LHS, &RHS))
return RHSType;
}
if ((!LHSType->isSveVLSBuiltinType() && !LHSType->isRealType()) ||
(!RHSType->isSveVLSBuiltinType() && !RHSType->isRealType())) {
Diag(Loc, diag::err_typecheck_vector_not_convertable_non_scalar)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
if (LHSType->isSveVLSBuiltinType() && RHSType->isSveVLSBuiltinType() &&
Context.getBuiltinVectorTypeInfo(LHSBuiltinTy).EC !=
Context.getBuiltinVectorTypeInfo(RHSBuiltinTy).EC) {
Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
if (LHSType->isSveVLSBuiltinType() || RHSType->isSveVLSBuiltinType()) {
QualType Scalar = LHSType->isSveVLSBuiltinType() ? RHSType : LHSType;
QualType Vector = LHSType->isSveVLSBuiltinType() ? LHSType : RHSType;
bool ScalarOrVector =
LHSType->isSveVLSBuiltinType() && RHSType->isSveVLSBuiltinType();
Diag(Loc, diag::err_typecheck_vector_not_convertable_implict_truncation)
<< ScalarOrVector << Scalar << Vector;
return QualType();
}
Diag(Loc, DiagID) << LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
// checkArithmeticNull - Detect when a NULL constant is used improperly in an
// expression. These are mainly cases where the null pointer is used as an
// integer instead of a pointer.
static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc, bool IsCompare) {
// The canonical way to check for a GNU null is with isNullPointerConstant,
// but we use a bit of a hack here for speed; this is a relatively
// hot path, and isNullPointerConstant is slow.
bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());
QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();
// Avoid analyzing cases where the result will either be invalid (and
// diagnosed as such) or entirely valid and not something to warn about.
if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
return;
// Comparison operations would not make sense with a null pointer no matter
// what the other expression is.
if (!IsCompare) {
S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
<< (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
<< (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
return;
}
// The rest of the operations only make sense with a null pointer
// if the other expression is a pointer.
if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
NonNullType->canDecayToPointerType())
return;
S.Diag(Loc, diag::warn_null_in_comparison_operation)
<< LHSNull /* LHS is NULL */ << NonNullType
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
}
static void DiagnoseDivisionSizeofPointerOrArray(Sema &S, Expr *LHS, Expr *RHS,
SourceLocation Loc) {
const auto *LUE = dyn_cast<UnaryExprOrTypeTraitExpr>(LHS);
const auto *RUE = dyn_cast<UnaryExprOrTypeTraitExpr>(RHS);
if (!LUE || !RUE)
return;
if (LUE->getKind() != UETT_SizeOf || LUE->isArgumentType() ||
RUE->getKind() != UETT_SizeOf)
return;
const Expr *LHSArg = LUE->getArgumentExpr()->IgnoreParens();
QualType LHSTy = LHSArg->getType();
QualType RHSTy;
if (RUE->isArgumentType())
RHSTy = RUE->getArgumentType().getNonReferenceType();
else
RHSTy = RUE->getArgumentExpr()->IgnoreParens()->getType();
if (LHSTy->isPointerType() && !RHSTy->isPointerType()) {
if (!S.Context.hasSameUnqualifiedType(LHSTy->getPointeeType(), RHSTy))
return;
S.Diag(Loc, diag::warn_division_sizeof_ptr) << LHS << LHS->getSourceRange();
if (const auto *DRE = dyn_cast<DeclRefExpr>(LHSArg)) {
if (const ValueDecl *LHSArgDecl = DRE->getDecl())
S.Diag(LHSArgDecl->getLocation(), diag::note_pointer_declared_here)
<< LHSArgDecl;
}
} else if (const auto *ArrayTy = S.Context.getAsArrayType(LHSTy)) {
QualType ArrayElemTy = ArrayTy->getElementType();
if (ArrayElemTy != S.Context.getBaseElementType(ArrayTy) ||
ArrayElemTy->isDependentType() || RHSTy->isDependentType() ||
RHSTy->isReferenceType() || ArrayElemTy->isCharType() ||
S.Context.getTypeSize(ArrayElemTy) == S.Context.getTypeSize(RHSTy))
return;
S.Diag(Loc, diag::warn_division_sizeof_array)
<< LHSArg->getSourceRange() << ArrayElemTy << RHSTy;
if (const auto *DRE = dyn_cast<DeclRefExpr>(LHSArg)) {
if (const ValueDecl *LHSArgDecl = DRE->getDecl())
S.Diag(LHSArgDecl->getLocation(), diag::note_array_declared_here)
<< LHSArgDecl;
}
S.Diag(Loc, diag::note_precedence_silence) << RHS;
}
}
static void DiagnoseBadDivideOrRemainderValues(Sema& S, ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc, bool IsDiv) {
// Check for division/remainder by zero.
Expr::EvalResult RHSValue;
if (!RHS.get()->isValueDependent() &&
RHS.get()->EvaluateAsInt(RHSValue, S.Context) &&
RHSValue.Val.getInt() == 0)
S.DiagRuntimeBehavior(Loc, RHS.get(),
S.PDiag(diag::warn_remainder_division_by_zero)
<< IsDiv << RHS.get()->getSourceRange());
}
QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
bool IsCompAssign, bool IsDiv) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
if (LHSTy->isVectorType() || RHSTy->isVectorType())
return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
/*AllowBothBool*/ getLangOpts().AltiVec,
/*AllowBoolConversions*/ false,
/*AllowBooleanOperation*/ false,
/*ReportInvalid*/ true);
if (LHSTy->isSveVLSBuiltinType() || RHSTy->isSveVLSBuiltinType())
return CheckSizelessVectorOperands(LHS, RHS, Loc, IsCompAssign,
ACK_Arithmetic);
if (!IsDiv &&
(LHSTy->isConstantMatrixType() || RHSTy->isConstantMatrixType()))
return CheckMatrixMultiplyOperands(LHS, RHS, Loc, IsCompAssign);
// For division, only matrix-by-scalar is supported. Other combinations with
// matrix types are invalid.
if (IsDiv && LHSTy->isConstantMatrixType() && RHSTy->isArithmeticType())
return CheckMatrixElementwiseOperands(LHS, RHS, Loc, IsCompAssign);
QualType compType = UsualArithmeticConversions(
LHS, RHS, Loc, IsCompAssign ? ACK_CompAssign : ACK_Arithmetic);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
if (compType.isNull() || !compType->isArithmeticType())
return InvalidOperands(Loc, LHS, RHS);
if (IsDiv) {
DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, IsDiv);
DiagnoseDivisionSizeofPointerOrArray(*this, LHS.get(), RHS.get(), Loc);
}
return compType;
}
QualType Sema::CheckRemainderOperands(
ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType()) {
if (LHS.get()->getType()->hasIntegerRepresentation() &&
RHS.get()->getType()->hasIntegerRepresentation())
return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
/*AllowBothBool*/ getLangOpts().AltiVec,
/*AllowBoolConversions*/ false,
/*AllowBooleanOperation*/ false,
/*ReportInvalid*/ true);
return InvalidOperands(Loc, LHS, RHS);
}
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType()) {
if (LHS.get()->getType()->hasIntegerRepresentation() &&
RHS.get()->getType()->hasIntegerRepresentation())
return CheckSizelessVectorOperands(LHS, RHS, Loc, IsCompAssign,
ACK_Arithmetic);
return InvalidOperands(Loc, LHS, RHS);
}
QualType compType = UsualArithmeticConversions(
LHS, RHS, Loc, IsCompAssign ? ACK_CompAssign : ACK_Arithmetic);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
if (compType.isNull() || !compType->isIntegerType())
return InvalidOperands(Loc, LHS, RHS);
DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, false /* IsDiv */);
return compType;
}
/// Diagnose invalid arithmetic on two void pointers.
static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
Expr *LHSExpr, Expr *RHSExpr) {
S.Diag(Loc, S.getLangOpts().CPlusPlus
? diag::err_typecheck_pointer_arith_void_type
: diag::ext_gnu_void_ptr)
<< 1 /* two pointers */ << LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
}
/// Diagnose invalid arithmetic on a void pointer.
static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
Expr *Pointer) {
S.Diag(Loc, S.getLangOpts().CPlusPlus
? diag::err_typecheck_pointer_arith_void_type
: diag::ext_gnu_void_ptr)
<< 0 /* one pointer */ << Pointer->getSourceRange();
}
/// Diagnose invalid arithmetic on a null pointer.
///
/// If \p IsGNUIdiom is true, the operation is using the 'p = (i8*)nullptr + n'
/// idiom, which we recognize as a GNU extension.
///
static void diagnoseArithmeticOnNullPointer(Sema &S, SourceLocation Loc,
Expr *Pointer, bool IsGNUIdiom) {
if (IsGNUIdiom)
S.Diag(Loc, diag::warn_gnu_null_ptr_arith)
<< Pointer->getSourceRange();
else
S.Diag(Loc, diag::warn_pointer_arith_null_ptr)
<< S.getLangOpts().CPlusPlus << Pointer->getSourceRange();
}
/// Diagnose invalid subraction on a null pointer.
///
static void diagnoseSubtractionOnNullPointer(Sema &S, SourceLocation Loc,
Expr *Pointer, bool BothNull) {
// Null - null is valid in C++ [expr.add]p7
if (BothNull && S.getLangOpts().CPlusPlus)
return;
// Is this s a macro from a system header?
if (S.Diags.getSuppressSystemWarnings() && S.SourceMgr.isInSystemMacro(Loc))
return;
S.DiagRuntimeBehavior(Loc, Pointer,
S.PDiag(diag::warn_pointer_sub_null_ptr)
<< S.getLangOpts().CPlusPlus
<< Pointer->getSourceRange());
}
/// Diagnose invalid arithmetic on two function pointers.
static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
Expr *LHS, Expr *RHS) {
assert(LHS->getType()->isAnyPointerType());
assert(RHS->getType()->isAnyPointerType());
S.Diag(Loc, S.getLangOpts().CPlusPlus
? diag::err_typecheck_pointer_arith_function_type
: diag::ext_gnu_ptr_func_arith)
<< 1 /* two pointers */ << LHS->getType()->getPointeeType()
// We only show the second type if it differs from the first.
<< (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
RHS->getType())
<< RHS->getType()->getPointeeType()
<< LHS->getSourceRange() << RHS->getSourceRange();
}
/// Diagnose invalid arithmetic on a function pointer.
static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
Expr *Pointer) {
assert(Pointer->getType()->isAnyPointerType());
S.Diag(Loc, S.getLangOpts().CPlusPlus
? diag::err_typecheck_pointer_arith_function_type
: diag::ext_gnu_ptr_func_arith)
<< 0 /* one pointer */ << Pointer->getType()->getPointeeType()
<< 0 /* one pointer, so only one type */
<< Pointer->getSourceRange();
}
/// Emit error if Operand is incomplete pointer type
///
/// \returns True if pointer has incomplete type
static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
Expr *Operand) {
QualType ResType = Operand->getType();
if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
ResType = ResAtomicType->getValueType();
assert(ResType->isAnyPointerType() && !ResType->isDependentType());
QualType PointeeTy = ResType->getPointeeType();
return S.RequireCompleteSizedType(
Loc, PointeeTy,
diag::err_typecheck_arithmetic_incomplete_or_sizeless_type,
Operand->getSourceRange());
}
/// Check the validity of an arithmetic pointer operand.
///
/// If the operand has pointer type, this code will check for pointer types
/// which are invalid in arithmetic operations. These will be diagnosed
/// appropriately, including whether or not the use is supported as an
/// extension.
///
/// \returns True when the operand is valid to use (even if as an extension).
static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
Expr *Operand) {
QualType ResType = Operand->getType();
if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
ResType = ResAtomicType->getValueType();
if (!ResType->isAnyPointerType()) return true;
QualType PointeeTy = ResType->getPointeeType();
if (PointeeTy->isVoidType()) {
diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
return !S.getLangOpts().CPlusPlus;
}
if (PointeeTy->isFunctionType()) {
diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
return !S.getLangOpts().CPlusPlus;
}
if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;
return true;
}
/// Check the validity of a binary arithmetic operation w.r.t. pointer
/// operands.
///
/// This routine will diagnose any invalid arithmetic on pointer operands much
/// like \see checkArithmeticOpPointerOperand. However, it has special logic
/// for emitting a single diagnostic even for operations where both LHS and RHS
/// are (potentially problematic) pointers.
///
/// \returns True when the operand is valid to use (even if as an extension).
static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
Expr *LHSExpr, Expr *RHSExpr) {
bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
if (!isLHSPointer && !isRHSPointer) return true;
QualType LHSPointeeTy, RHSPointeeTy;
if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();
// if both are pointers check if operation is valid wrt address spaces
if (isLHSPointer && isRHSPointer) {
if (!LHSPointeeTy.isAddressSpaceOverlapping(RHSPointeeTy)) {
S.Diag(Loc,
diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
<< LHSExpr->getType() << RHSExpr->getType() << 1 /*arithmetic op*/
<< LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
return false;
}
}
// Check for arithmetic on pointers to incomplete types.
bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
if (isLHSVoidPtr || isRHSVoidPtr) {
if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);
return !S.getLangOpts().CPlusPlus;
}
bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
if (isLHSFuncPtr || isRHSFuncPtr) {
if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
RHSExpr);
else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);
return !S.getLangOpts().CPlusPlus;
}
if (isLHSPointer && checkArithmeticIncompletePointerType(S, Loc, LHSExpr))
return false;
if (isRHSPointer && checkArithmeticIncompletePointerType(S, Loc, RHSExpr))
return false;
return true;
}
/// diagnoseStringPlusInt - Emit a warning when adding an integer to a string
/// literal.
static void diagnoseStringPlusInt(Sema &Self, SourceLocation OpLoc,
Expr *LHSExpr, Expr *RHSExpr) {
StringLiteral* StrExpr = dyn_cast<StringLiteral>(LHSExpr->IgnoreImpCasts());
Expr* IndexExpr = RHSExpr;
if (!StrExpr) {
StrExpr = dyn_cast<StringLiteral>(RHSExpr->IgnoreImpCasts());
IndexExpr = LHSExpr;
}
bool IsStringPlusInt = StrExpr &&
IndexExpr->getType()->isIntegralOrUnscopedEnumerationType();
if (!IsStringPlusInt || IndexExpr->isValueDependent())
return;
SourceRange DiagRange(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
Self.Diag(OpLoc, diag::warn_string_plus_int)
<< DiagRange << IndexExpr->IgnoreImpCasts()->getType();
// Only print a fixit for "str" + int, not for int + "str".
if (IndexExpr == RHSExpr) {
SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getEndLoc());
Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
<< FixItHint::CreateInsertion(LHSExpr->getBeginLoc(), "&")
<< FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
<< FixItHint::CreateInsertion(EndLoc, "]");
} else
Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
}
/// Emit a warning when adding a char literal to a string.
static void diagnoseStringPlusChar(Sema &Self, SourceLocation OpLoc,
Expr *LHSExpr, Expr *RHSExpr) {
const Expr *StringRefExpr = LHSExpr;
const CharacterLiteral *CharExpr =
dyn_cast<CharacterLiteral>(RHSExpr->IgnoreImpCasts());
if (!CharExpr) {
CharExpr = dyn_cast<CharacterLiteral>(LHSExpr->IgnoreImpCasts());
StringRefExpr = RHSExpr;
}
if (!CharExpr || !StringRefExpr)
return;
const QualType StringType = StringRefExpr->getType();
// Return if not a PointerType.
if (!StringType->isAnyPointerType())
return;
// Return if not a CharacterType.
if (!StringType->getPointeeType()->isAnyCharacterType())
return;
ASTContext &Ctx = Self.getASTContext();
SourceRange DiagRange(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
const QualType CharType = CharExpr->getType();
if (!CharType->isAnyCharacterType() &&
CharType->isIntegerType() &&
llvm::isUIntN(Ctx.getCharWidth(), CharExpr->getValue())) {
Self.Diag(OpLoc, diag::warn_string_plus_char)
<< DiagRange << Ctx.CharTy;
} else {
Self.Diag(OpLoc, diag::warn_string_plus_char)
<< DiagRange << CharExpr->getType();
}
// Only print a fixit for str + char, not for char + str.
if (isa<CharacterLiteral>(RHSExpr->IgnoreImpCasts())) {
SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getEndLoc());
Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
<< FixItHint::CreateInsertion(LHSExpr->getBeginLoc(), "&")
<< FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
<< FixItHint::CreateInsertion(EndLoc, "]");
} else {
Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
}
}
/// Emit error when two pointers are incompatible.
static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
Expr *LHSExpr, Expr *RHSExpr) {
assert(LHSExpr->getType()->isAnyPointerType());
assert(RHSExpr->getType()->isAnyPointerType());
S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
<< LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
}
// C99 6.5.6
QualType Sema::CheckAdditionOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc, BinaryOperatorKind Opc,
QualType* CompLHSTy) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType()) {
QualType compType =
CheckVectorOperands(LHS, RHS, Loc, CompLHSTy,
/*AllowBothBool*/ getLangOpts().AltiVec,
/*AllowBoolConversions*/ getLangOpts().ZVector,
/*AllowBooleanOperation*/ false,
/*ReportInvalid*/ true);
if (CompLHSTy) *CompLHSTy = compType;
return compType;
}
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType()) {
QualType compType =
CheckSizelessVectorOperands(LHS, RHS, Loc, CompLHSTy, ACK_Arithmetic);
if (CompLHSTy)
*CompLHSTy = compType;
return compType;
}
if (LHS.get()->getType()->isConstantMatrixType() ||
RHS.get()->getType()->isConstantMatrixType()) {
QualType compType =
CheckMatrixElementwiseOperands(LHS, RHS, Loc, CompLHSTy);
if (CompLHSTy)
*CompLHSTy = compType;
return compType;
}
QualType compType = UsualArithmeticConversions(
LHS, RHS, Loc, CompLHSTy ? ACK_CompAssign : ACK_Arithmetic);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
// Diagnose "string literal" '+' int and string '+' "char literal".
if (Opc == BO_Add) {
diagnoseStringPlusInt(*this, Loc, LHS.get(), RHS.get());
diagnoseStringPlusChar(*this, Loc, LHS.get(), RHS.get());
}
// handle the common case first (both operands are arithmetic).
if (!compType.isNull() && compType->isArithmeticType()) {
if (CompLHSTy) *CompLHSTy = compType;
return compType;
}
// Type-checking. Ultimately the pointer's going to be in PExp;
// note that we bias towards the LHS being the pointer.
Expr *PExp = LHS.get(), *IExp = RHS.get();
bool isObjCPointer;
if (PExp->getType()->isPointerType()) {
isObjCPointer = false;
} else if (PExp->getType()->isObjCObjectPointerType()) {
isObjCPointer = true;
} else {
std::swap(PExp, IExp);
if (PExp->getType()->isPointerType()) {
isObjCPointer = false;
} else if (PExp->getType()->isObjCObjectPointerType()) {
isObjCPointer = true;
} else {
return InvalidOperands(Loc, LHS, RHS);
}
}
assert(PExp->getType()->isAnyPointerType());
if (!IExp->getType()->isIntegerType())
return InvalidOperands(Loc, LHS, RHS);
// Adding to a null pointer results in undefined behavior.
if (PExp->IgnoreParenCasts()->isNullPointerConstant(
Context, Expr::NPC_ValueDependentIsNotNull)) {
// In C++ adding zero to a null pointer is defined.
Expr::EvalResult KnownVal;
if (!getLangOpts().CPlusPlus ||
(!IExp->isValueDependent() &&
(!IExp->EvaluateAsInt(KnownVal, Context) ||
KnownVal.Val.getInt() != 0))) {
// Check the conditions to see if this is the 'p = nullptr + n' idiom.
bool IsGNUIdiom = BinaryOperator::isNullPointerArithmeticExtension(
Context, BO_Add, PExp, IExp);
diagnoseArithmeticOnNullPointer(*this, Loc, PExp, IsGNUIdiom);
}
}
if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
return QualType();
if (isObjCPointer && checkArithmeticOnObjCPointer(*this, Loc, PExp))
return QualType();
// Check array bounds for pointer arithemtic
CheckArrayAccess(PExp, IExp);
if (CompLHSTy) {
QualType LHSTy = Context.isPromotableBitField(LHS.get());
if (LHSTy.isNull()) {
LHSTy = LHS.get()->getType();
if (Context.isPromotableIntegerType(LHSTy))
LHSTy = Context.getPromotedIntegerType(LHSTy);
}
*CompLHSTy = LHSTy;
}
return PExp->getType();
}
// C99 6.5.6
QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
QualType* CompLHSTy) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType()) {
QualType compType =
CheckVectorOperands(LHS, RHS, Loc, CompLHSTy,
/*AllowBothBool*/ getLangOpts().AltiVec,
/*AllowBoolConversions*/ getLangOpts().ZVector,
/*AllowBooleanOperation*/ false,
/*ReportInvalid*/ true);
if (CompLHSTy) *CompLHSTy = compType;
return compType;
}
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType()) {
QualType compType =
CheckSizelessVectorOperands(LHS, RHS, Loc, CompLHSTy, ACK_Arithmetic);
if (CompLHSTy)
*CompLHSTy = compType;
return compType;
}
if (LHS.get()->getType()->isConstantMatrixType() ||
RHS.get()->getType()->isConstantMatrixType()) {
QualType compType =
CheckMatrixElementwiseOperands(LHS, RHS, Loc, CompLHSTy);
if (CompLHSTy)
*CompLHSTy = compType;
return compType;
}
QualType compType = UsualArithmeticConversions(
LHS, RHS, Loc, CompLHSTy ? ACK_CompAssign : ACK_Arithmetic);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
// Enforce type constraints: C99 6.5.6p3.
// Handle the common case first (both operands are arithmetic).
if (!compType.isNull() && compType->isArithmeticType()) {
if (CompLHSTy) *CompLHSTy = compType;
return compType;
}
// Either ptr - int or ptr - ptr.
if (LHS.get()->getType()->isAnyPointerType()) {
QualType lpointee = LHS.get()->getType()->getPointeeType();
// Diagnose bad cases where we step over interface counts.
if (LHS.get()->getType()->isObjCObjectPointerType() &&
checkArithmeticOnObjCPointer(*this, Loc, LHS.get()))
return QualType();
// The result type of a pointer-int computation is the pointer type.
if (RHS.get()->getType()->isIntegerType()) {
// Subtracting from a null pointer should produce a warning.
// The last argument to the diagnose call says this doesn't match the
// GNU int-to-pointer idiom.
if (LHS.get()->IgnoreParenCasts()->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNotNull)) {
// In C++ adding zero to a null pointer is defined.
Expr::EvalResult KnownVal;
if (!getLangOpts().CPlusPlus ||
(!RHS.get()->isValueDependent() &&
(!RHS.get()->EvaluateAsInt(KnownVal, Context) ||
KnownVal.Val.getInt() != 0))) {
diagnoseArithmeticOnNullPointer(*this, Loc, LHS.get(), false);
}
}
if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
return QualType();
// Check array bounds for pointer arithemtic
CheckArrayAccess(LHS.get(), RHS.get(), /*ArraySubscriptExpr*/nullptr,
/*AllowOnePastEnd*/true, /*IndexNegated*/true);
if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
return LHS.get()->getType();
}
// Handle pointer-pointer subtractions.
if (const PointerType *RHSPTy
= RHS.get()->getType()->getAs<PointerType>()) {
QualType rpointee = RHSPTy->getPointeeType();
if (getLangOpts().CPlusPlus) {
// Pointee types must be the same: C++ [expr.add]
if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
}
} else {
// Pointee types must be compatible C99 6.5.6p3
if (!Context.typesAreCompatible(
Context.getCanonicalType(lpointee).getUnqualifiedType(),
Context.getCanonicalType(rpointee).getUnqualifiedType())) {
diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
return QualType();
}
}
if (!checkArithmeticBinOpPointerOperands(*this, Loc,
LHS.get(), RHS.get()))
return QualType();
bool LHSIsNullPtr = LHS.get()->IgnoreParenCasts()->isNullPointerConstant(
Context, Expr::NPC_ValueDependentIsNotNull);
bool RHSIsNullPtr = RHS.get()->IgnoreParenCasts()->isNullPointerConstant(
Context, Expr::NPC_ValueDependentIsNotNull);
// Subtracting nullptr or from nullptr is suspect
if (LHSIsNullPtr)
diagnoseSubtractionOnNullPointer(*this, Loc, LHS.get(), RHSIsNullPtr);
if (RHSIsNullPtr)
diagnoseSubtractionOnNullPointer(*this, Loc, RHS.get(), LHSIsNullPtr);
// The pointee type may have zero size. As an extension, a structure or
// union may have zero size or an array may have zero length. In this
// case subtraction does not make sense.
if (!rpointee->isVoidType() && !rpointee->isFunctionType()) {
CharUnits ElementSize = Context.getTypeSizeInChars(rpointee);
if (ElementSize.isZero()) {
Diag(Loc,diag::warn_sub_ptr_zero_size_types)
<< rpointee.getUnqualifiedType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
}
}
if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
return Context.getPointerDiffType();
}
}
return InvalidOperands(Loc, LHS, RHS);
}
static bool isScopedEnumerationType(QualType T) {
if (const EnumType *ET = T->getAs<EnumType>())
return ET->getDecl()->isScoped();
return false;
}
static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc, BinaryOperatorKind Opc,
QualType LHSType) {
// OpenCL 6.3j: shift values are effectively % word size of LHS (more defined),
// so skip remaining warnings as we don't want to modify values within Sema.
if (S.getLangOpts().OpenCL)
return;
// Check right/shifter operand
Expr::EvalResult RHSResult;
if (RHS.get()->isValueDependent() ||
!RHS.get()->EvaluateAsInt(RHSResult, S.Context))
return;
llvm::APSInt Right = RHSResult.Val.getInt();
if (Right.isNegative()) {
S.DiagRuntimeBehavior(Loc, RHS.get(),
S.PDiag(diag::warn_shift_negative)
<< RHS.get()->getSourceRange());
return;
}
QualType LHSExprType = LHS.get()->getType();
uint64_t LeftSize = S.Context.getTypeSize(LHSExprType);
if (LHSExprType->isBitIntType())
LeftSize = S.Context.getIntWidth(LHSExprType);
else if (LHSExprType->isFixedPointType()) {
auto FXSema = S.Context.getFixedPointSemantics(LHSExprType);
LeftSize = FXSema.getWidth() - (unsigned)FXSema.hasUnsignedPadding();
}
if (Right.uge(LeftSize)) {
S.DiagRuntimeBehavior(Loc, RHS.get(),
S.PDiag(diag::warn_shift_gt_typewidth)
<< RHS.get()->getSourceRange());
return;
}
// FIXME: We probably need to handle fixed point types specially here.
if (Opc != BO_Shl || LHSExprType->isFixedPointType())
return;
// When left shifting an ICE which is signed, we can check for overflow which
// according to C++ standards prior to C++2a has undefined behavior
// ([expr.shift] 5.8/2). Unsigned integers have defined behavior modulo one
// more than the maximum value representable in the result type, so never
// warn for those. (FIXME: Unsigned left-shift overflow in a constant
// expression is still probably a bug.)
Expr::EvalResult LHSResult;
if (LHS.get()->isValueDependent() ||
LHSType->hasUnsignedIntegerRepresentation() ||
!LHS.get()->EvaluateAsInt(LHSResult, S.Context))
return;
llvm::APSInt Left = LHSResult.Val.getInt();
// Don't warn if signed overflow is defined, then all the rest of the
// diagnostics will not be triggered because the behavior is defined.
// Also don't warn in C++20 mode (and newer), as signed left shifts
// always wrap and never overflow.
if (S.getLangOpts().isSignedOverflowDefined() || S.getLangOpts().CPlusPlus20)
return;
// If LHS does not have a non-negative value then, the
// behavior is undefined before C++2a. Warn about it.
if (Left.isNegative()) {
S.DiagRuntimeBehavior(Loc, LHS.get(),
S.PDiag(diag::warn_shift_lhs_negative)
<< LHS.get()->getSourceRange());
return;
}
llvm::APInt ResultBits =
static_cast<llvm::APInt &>(Right) + Left.getSignificantBits();
if (ResultBits.ule(LeftSize))
return;
llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
Result = Result.shl(Right);
// Print the bit representation of the signed integer as an unsigned
// hexadecimal number.
SmallString<40> HexResult;
Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
// If we are only missing a sign bit, this is less likely to result in actual
// bugs -- if the result is cast back to an unsigned type, it will have the
// expected value. Thus we place this behind a different warning that can be
// turned off separately if needed.
if (ResultBits - 1 == LeftSize) {
S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
<< HexResult << LHSType
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return;
}
S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
<< HexResult.str() << Result.getSignificantBits() << LHSType
<< Left.getBitWidth() << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
}
/// Return the resulting type when a vector is shifted
/// by a scalar or vector shift amount.
static QualType checkVectorShift(Sema &S, ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc, bool IsCompAssign) {
// OpenCL v1.1 s6.3.j says RHS can be a vector only if LHS is a vector.
if ((S.LangOpts.OpenCL || S.LangOpts.ZVector) &&
!LHS.get()->getType()->isVectorType()) {
S.Diag(Loc, diag::err_shift_rhs_only_vector)
<< RHS.get()->getType() << LHS.get()->getType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
}
if (!IsCompAssign) {
LHS = S.UsualUnaryConversions(LHS.get());
if (LHS.isInvalid()) return QualType();
}
RHS = S.UsualUnaryConversions(RHS.get());
if (RHS.isInvalid()) return QualType();
QualType LHSType = LHS.get()->getType();
// Note that LHS might be a scalar because the routine calls not only in
// OpenCL case.
const VectorType *LHSVecTy = LHSType->getAs<VectorType>();
QualType LHSEleType = LHSVecTy ? LHSVecTy->getElementType() : LHSType;
// Note that RHS might not be a vector.
QualType RHSType = RHS.get()->getType();
const VectorType *RHSVecTy = RHSType->getAs<VectorType>();
QualType RHSEleType = RHSVecTy ? RHSVecTy->getElementType() : RHSType;
// Do not allow shifts for boolean vectors.
if ((LHSVecTy && LHSVecTy->isExtVectorBoolType()) ||
(RHSVecTy && RHSVecTy->isExtVectorBoolType())) {
S.Diag(Loc, diag::err_typecheck_invalid_operands)
<< LHS.get()->getType() << RHS.get()->getType()
<< LHS.get()->getSourceRange();
return QualType();
}
// The operands need to be integers.
if (!LHSEleType->isIntegerType()) {
S.Diag(Loc, diag::err_typecheck_expect_int)
<< LHS.get()->getType() << LHS.get()->getSourceRange();
return QualType();
}
if (!RHSEleType->isIntegerType()) {
S.Diag(Loc, diag::err_typecheck_expect_int)
<< RHS.get()->getType() << RHS.get()->getSourceRange();
return QualType();
}
if (!LHSVecTy) {
assert(RHSVecTy);
if (IsCompAssign)
return RHSType;
if (LHSEleType != RHSEleType) {
LHS = S.ImpCastExprToType(LHS.get(),RHSEleType, CK_IntegralCast);
LHSEleType = RHSEleType;
}
QualType VecTy =
S.Context.getExtVectorType(LHSEleType, RHSVecTy->getNumElements());
LHS = S.ImpCastExprToType(LHS.get(), VecTy, CK_VectorSplat);
LHSType = VecTy;
} else if (RHSVecTy) {
// OpenCL v1.1 s6.3.j says that for vector types, the operators
// are applied component-wise. So if RHS is a vector, then ensure
// that the number of elements is the same as LHS...
if (RHSVecTy->getNumElements() != LHSVecTy->getNumElements()) {
S.Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)
<< LHS.get()->getType() << RHS.get()->getType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
return QualType();
}
if (!S.LangOpts.OpenCL && !S.LangOpts.ZVector) {
const BuiltinType *LHSBT = LHSEleType->getAs<clang::BuiltinType>();
const BuiltinType *RHSBT = RHSEleType->getAs<clang::BuiltinType>();
if (LHSBT != RHSBT &&
S.Context.getTypeSize(LHSBT) != S.Context.getTypeSize(RHSBT)) {
S.Diag(Loc, diag::warn_typecheck_vector_element_sizes_not_equal)
<< LHS.get()->getType() << RHS.get()->getType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
}
}
} else {
// ...else expand RHS to match the number of elements in LHS.
QualType VecTy =
S.Context.getExtVectorType(RHSEleType, LHSVecTy->getNumElements());
RHS = S.ImpCastExprToType(RHS.get(), VecTy, CK_VectorSplat);
}
return LHSType;
}
static QualType checkSizelessVectorShift(Sema &S, ExprResult &LHS,
ExprResult &RHS, SourceLocation Loc,
bool IsCompAssign) {
if (!IsCompAssign) {
LHS = S.UsualUnaryConversions(LHS.get());
if (LHS.isInvalid())
return QualType();
}
RHS = S.UsualUnaryConversions(RHS.get());
if (RHS.isInvalid())
return QualType();
QualType LHSType = LHS.get()->getType();
const BuiltinType *LHSBuiltinTy = LHSType->castAs<BuiltinType>();
QualType LHSEleType = LHSType->isSveVLSBuiltinType()
? LHSBuiltinTy->getSveEltType(S.getASTContext())
: LHSType;
// Note that RHS might not be a vector
QualType RHSType = RHS.get()->getType();
const BuiltinType *RHSBuiltinTy = RHSType->castAs<BuiltinType>();
QualType RHSEleType = RHSType->isSveVLSBuiltinType()
? RHSBuiltinTy->getSveEltType(S.getASTContext())
: RHSType;
if ((LHSBuiltinTy && LHSBuiltinTy->isSVEBool()) ||
(RHSBuiltinTy && RHSBuiltinTy->isSVEBool())) {
S.Diag(Loc, diag::err_typecheck_invalid_operands)
<< LHSType << RHSType << LHS.get()->getSourceRange();
return QualType();
}
if (!LHSEleType->isIntegerType()) {
S.Diag(Loc, diag::err_typecheck_expect_int)
<< LHS.get()->getType() << LHS.get()->getSourceRange();
return QualType();
}
if (!RHSEleType->isIntegerType()) {
S.Diag(Loc, diag::err_typecheck_expect_int)
<< RHS.get()->getType() << RHS.get()->getSourceRange();
return QualType();
}
if (LHSType->isSveVLSBuiltinType() && RHSType->isSveVLSBuiltinType() &&
(S.Context.getBuiltinVectorTypeInfo(LHSBuiltinTy).EC !=
S.Context.getBuiltinVectorTypeInfo(RHSBuiltinTy).EC)) {
S.Diag(Loc, diag::err_typecheck_invalid_operands)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
if (!LHSType->isSveVLSBuiltinType()) {
assert(RHSType->isSveVLSBuiltinType());
if (IsCompAssign)
return RHSType;
if (LHSEleType != RHSEleType) {
LHS = S.ImpCastExprToType(LHS.get(), RHSEleType, clang::CK_IntegralCast);
LHSEleType = RHSEleType;
}
const llvm::ElementCount VecSize =
S.Context.getBuiltinVectorTypeInfo(RHSBuiltinTy).EC;
QualType VecTy =
S.Context.getScalableVectorType(LHSEleType, VecSize.getKnownMinValue());
LHS = S.ImpCastExprToType(LHS.get(), VecTy, clang::CK_VectorSplat);
LHSType = VecTy;
} else if (RHSBuiltinTy && RHSBuiltinTy->isSveVLSBuiltinType()) {
if (S.Context.getTypeSize(RHSBuiltinTy) !=
S.Context.getTypeSize(LHSBuiltinTy)) {
S.Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
return QualType();
}
} else {
const llvm::ElementCount VecSize =
S.Context.getBuiltinVectorTypeInfo(LHSBuiltinTy).EC;
if (LHSEleType != RHSEleType) {
RHS = S.ImpCastExprToType(RHS.get(), LHSEleType, clang::CK_IntegralCast);
RHSEleType = LHSEleType;
}
QualType VecTy =
S.Context.getScalableVectorType(RHSEleType, VecSize.getKnownMinValue());
RHS = S.ImpCastExprToType(RHS.get(), VecTy, CK_VectorSplat);
}
return LHSType;
}
// C99 6.5.7
QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc, BinaryOperatorKind Opc,
bool IsCompAssign) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
// Vector shifts promote their scalar inputs to vector type.
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType()) {
if (LangOpts.ZVector) {
// The shift operators for the z vector extensions work basically
// like general shifts, except that neither the LHS nor the RHS is
// allowed to be a "vector bool".
if (auto LHSVecType = LHS.get()->getType()->getAs<VectorType>())
if (LHSVecType->getVectorKind() == VectorKind::AltiVecBool)
return InvalidOperands(Loc, LHS, RHS);
if (auto RHSVecType = RHS.get()->getType()->getAs<VectorType>())
if (RHSVecType->getVectorKind() == VectorKind::AltiVecBool)
return InvalidOperands(Loc, LHS, RHS);
}
return checkVectorShift(*this, LHS, RHS, Loc, IsCompAssign);
}
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType())
return checkSizelessVectorShift(*this, LHS, RHS, Loc, IsCompAssign);
// Shifts don't perform usual arithmetic conversions, they just do integer
// promotions on each operand. C99 6.5.7p3
// For the LHS, do usual unary conversions, but then reset them away
// if this is a compound assignment.
ExprResult OldLHS = LHS;
LHS = UsualUnaryConversions(LHS.get());
if (LHS.isInvalid())
return QualType();
QualType LHSType = LHS.get()->getType();
if (IsCompAssign) LHS = OldLHS;
// The RHS is simpler.
RHS = UsualUnaryConversions(RHS.get());
if (RHS.isInvalid())
return QualType();
QualType RHSType = RHS.get()->getType();
// C99 6.5.7p2: Each of the operands shall have integer type.
// Embedded-C 4.1.6.2.2: The LHS may also be fixed-point.
if ((!LHSType->isFixedPointOrIntegerType() &&
!LHSType->hasIntegerRepresentation()) ||
!RHSType->hasIntegerRepresentation())
return InvalidOperands(Loc, LHS, RHS);
// C++0x: Don't allow scoped enums. FIXME: Use something better than
// hasIntegerRepresentation() above instead of this.
if (isScopedEnumerationType(LHSType) ||
isScopedEnumerationType(RHSType)) {
return InvalidOperands(Loc, LHS, RHS);
}
DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);
// "The type of the result is that of the promoted left operand."
return LHSType;
}
/// Diagnose bad pointer comparisons.
static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
ExprResult &LHS, ExprResult &RHS,
bool IsError) {
S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
: diag::ext_typecheck_comparison_of_distinct_pointers)
<< LHS.get()->getType() << RHS.get()->getType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
}
/// Returns false if the pointers are converted to a composite type,
/// true otherwise.
static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
ExprResult &LHS, ExprResult &RHS) {
// C++ [expr.rel]p2:
// [...] Pointer conversions (4.10) and qualification
// conversions (4.4) are performed on pointer operands (or on
// a pointer operand and a null pointer constant) to bring
// them to their composite pointer type. [...]
//
// C++ [expr.eq]p1 uses the same notion for (in)equality
// comparisons of pointers.
QualType LHSType = LHS.get()->getType();
QualType RHSType = RHS.get()->getType();
assert(LHSType->isPointerType() || RHSType->isPointerType() ||
LHSType->isMemberPointerType() || RHSType->isMemberPointerType());
QualType T = S.FindCompositePointerType(Loc, LHS, RHS);
if (T.isNull()) {
if ((LHSType->isAnyPointerType() || LHSType->isMemberPointerType()) &&
(RHSType->isAnyPointerType() || RHSType->isMemberPointerType()))
diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
else
S.InvalidOperands(Loc, LHS, RHS);
return true;
}
return false;
}
static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
ExprResult &LHS,
ExprResult &RHS,
bool IsError) {
S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
: diag::ext_typecheck_comparison_of_fptr_to_void)
<< LHS.get()->getType() << RHS.get()->getType()
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
}
static bool isObjCObjectLiteral(ExprResult &E) {
switch (E.get()->IgnoreParenImpCasts()->getStmtClass()) {
case Stmt::ObjCArrayLiteralClass:
case Stmt::ObjCDictionaryLiteralClass:
case Stmt::ObjCStringLiteralClass:
case Stmt::ObjCBoxedExprClass:
return true;
default:
// Note that ObjCBoolLiteral is NOT an object literal!
return false;
}
}
static bool hasIsEqualMethod(Sema &S, const Expr *LHS, const Expr *RHS) {
const ObjCObjectPointerType *Type =
LHS->getType()->getAs<ObjCObjectPointerType>();
// If this is not actually an Objective-C object, bail out.
if (!Type)
return false;
// Get the LHS object's interface type.
QualType InterfaceType = Type->getPointeeType();
// If the RHS isn't an Objective-C object, bail out.
if (!RHS->getType()->isObjCObjectPointerType())
return false;
// Try to find the -isEqual: method.
Selector IsEqualSel = S.NSAPIObj->getIsEqualSelector();
ObjCMethodDecl *Method = S.LookupMethodInObjectType(IsEqualSel,
InterfaceType,
/*IsInstance=*/true);
if (!Method) {
if (Type->isObjCIdType()) {
// For 'id', just check the global pool.
Method = S.LookupInstanceMethodInGlobalPool(IsEqualSel, SourceRange(),
/*receiverId=*/true);
} else {
// Check protocols.
Method = S.LookupMethodInQualifiedType(IsEqualSel, Type,
/*IsInstance=*/true);
}
}
if (!Method)
return false;
QualType T = Method->parameters()[0]->getType();
if (!T->isObjCObjectPointerType())
return false;
QualType R = Method->getReturnType();
if (!R->isScalarType())
return false;
return true;
}
Sema::ObjCLiteralKind Sema::CheckLiteralKind(Expr *FromE) {
FromE = FromE->IgnoreParenImpCasts();
switch (FromE->getStmtClass()) {
default:
break;
case Stmt::ObjCStringLiteralClass:
// "string literal"
return LK_String;
case Stmt::ObjCArrayLiteralClass:
// "array literal"
return LK_Array;
case Stmt::ObjCDictionaryLiteralClass:
// "dictionary literal"
return LK_Dictionary;
case Stmt::BlockExprClass:
return LK_Block;
case Stmt::ObjCBoxedExprClass: {
Expr *Inner = cast<ObjCBoxedExpr>(FromE)->getSubExpr()->IgnoreParens();
switch (Inner->getStmtClass()) {
case Stmt::IntegerLiteralClass:
case Stmt::FloatingLiteralClass:
case Stmt::CharacterLiteralClass:
case Stmt::ObjCBoolLiteralExprClass:
case Stmt::CXXBoolLiteralExprClass:
// "numeric literal"
return LK_Numeric;
case Stmt::ImplicitCastExprClass: {
CastKind CK = cast<CastExpr>(Inner)->getCastKind();
// Boolean literals can be represented by implicit casts.
if (CK == CK_IntegralToBoolean || CK == CK_IntegralCast)
return LK_Numeric;
break;
}
default:
break;
}
return LK_Boxed;
}
}
return LK_None;
}
static void diagnoseObjCLiteralComparison(Sema &S, SourceLocation Loc,
ExprResult &LHS, ExprResult &RHS,
BinaryOperator::Opcode Opc){
Expr *Literal;
Expr *Other;
if (isObjCObjectLiteral(LHS)) {
Literal = LHS.get();
Other = RHS.get();
} else {
Literal = RHS.get();
Other = LHS.get();
}
// Don't warn on comparisons against nil.
Other = Other->IgnoreParenCasts();
if (Other->isNullPointerConstant(S.getASTContext(),
Expr::NPC_ValueDependentIsNotNull))
return;
// This should be kept in sync with warn_objc_literal_comparison.
// LK_String should always be after the other literals, since it has its own
// warning flag.
Sema::ObjCLiteralKind LiteralKind = S.CheckLiteralKind(Literal);
assert(LiteralKind != Sema::LK_Block);
if (LiteralKind == Sema::LK_None) {
llvm_unreachable("Unknown Objective-C object literal kind");
}
if (LiteralKind == Sema::LK_String)
S.Diag(Loc, diag::warn_objc_string_literal_comparison)
<< Literal->getSourceRange();
else
S.Diag(Loc, diag::warn_objc_literal_comparison)
<< LiteralKind << Literal->getSourceRange();
if (BinaryOperator::isEqualityOp(Opc) &&
hasIsEqualMethod(S, LHS.get(), RHS.get())) {
SourceLocation Start = LHS.get()->getBeginLoc();
SourceLocation End = S.getLocForEndOfToken(RHS.get()->getEndLoc());
CharSourceRange OpRange =
CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
S.Diag(Loc, diag::note_objc_literal_comparison_isequal)
<< FixItHint::CreateInsertion(Start, Opc == BO_EQ ? "[" : "![")
<< FixItHint::CreateReplacement(OpRange, " isEqual:")
<< FixItHint::CreateInsertion(End, "]");
}
}
/// Warns on !x < y, !x & y where !(x < y), !(x & y) was probably intended.
static void diagnoseLogicalNotOnLHSofCheck(Sema &S, ExprResult &LHS,
ExprResult &RHS, SourceLocation Loc,
BinaryOperatorKind Opc) {
// Check that left hand side is !something.
UnaryOperator *UO = dyn_cast<UnaryOperator>(LHS.get()->IgnoreImpCasts());
if (!UO || UO->getOpcode() != UO_LNot) return;
// Only check if the right hand side is non-bool arithmetic type.
if (RHS.get()->isKnownToHaveBooleanValue()) return;
// Make sure that the something in !something is not bool.
Expr *SubExpr = UO->getSubExpr()->IgnoreImpCasts();
if (SubExpr->isKnownToHaveBooleanValue()) return;
// Emit warning.
bool IsBitwiseOp = Opc == BO_And || Opc == BO_Or || Opc == BO_Xor;
S.Diag(UO->getOperatorLoc(), diag::warn_logical_not_on_lhs_of_check)
<< Loc << IsBitwiseOp;
// First note suggest !(x < y)
SourceLocation FirstOpen = SubExpr->getBeginLoc();
SourceLocation FirstClose = RHS.get()->getEndLoc();
FirstClose = S.getLocForEndOfToken(FirstClose);
if (FirstClose.isInvalid())
FirstOpen = SourceLocation();
S.Diag(UO->getOperatorLoc(), diag::note_logical_not_fix)
<< IsBitwiseOp
<< FixItHint::CreateInsertion(FirstOpen, "(")
<< FixItHint::CreateInsertion(FirstClose, ")");
// Second note suggests (!x) < y
SourceLocation SecondOpen = LHS.get()->getBeginLoc();
SourceLocation SecondClose = LHS.get()->getEndLoc();
SecondClose = S.getLocForEndOfToken(SecondClose);
if (SecondClose.isInvalid())
SecondOpen = SourceLocation();
S.Diag(UO->getOperatorLoc(), diag::note_logical_not_silence_with_parens)
<< FixItHint::CreateInsertion(SecondOpen, "(")
<< FixItHint::CreateInsertion(SecondClose, ")");
}
// Returns true if E refers to a non-weak array.
static bool checkForArray(const Expr *E) {
const ValueDecl *D = nullptr;
if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E)) {
D = DR->getDecl();
} else if (const MemberExpr *Mem = dyn_cast<MemberExpr>(E)) {
if (Mem->isImplicitAccess())
D = Mem->getMemberDecl();
}
if (!D)
return false;
return D->getType()->isArrayType() && !D->isWeak();
}
/// Diagnose some forms of syntactically-obvious tautological comparison.
static void diagnoseTautologicalComparison(Sema &S, SourceLocation Loc,
Expr *LHS, Expr *RHS,
BinaryOperatorKind Opc) {
Expr *LHSStripped = LHS->IgnoreParenImpCasts();
Expr *RHSStripped = RHS->IgnoreParenImpCasts();
QualType LHSType = LHS->getType();
QualType RHSType = RHS->getType();
if (LHSType->hasFloatingRepresentation() ||
(LHSType->isBlockPointerType() && !BinaryOperator::isEqualityOp(Opc)) ||
S.inTemplateInstantiation())
return;
// WebAssembly Tables cannot be compared, therefore shouldn't emit
// Tautological diagnostics.
if (LHSType->isWebAssemblyTableType() || RHSType->isWebAssemblyTableType())
return;
// Comparisons between two array types are ill-formed for operator<=>, so
// we shouldn't emit any additional warnings about it.
if (Opc == BO_Cmp && LHSType->isArrayType() && RHSType->isArrayType())
return;
// For non-floating point types, check for self-comparisons of the form
// x == x, x != x, x < x, etc. These always evaluate to a constant, and
// often indicate logic errors in the program.
//
// NOTE: Don't warn about comparison expressions resulting from macro
// expansion. Also don't warn about comparisons which are only self
// comparisons within a template instantiation. The warnings should catch
// obvious cases in the definition of the template anyways. The idea is to
// warn when the typed comparison operator will always evaluate to the same
// result.
// Used for indexing into %select in warn_comparison_always
enum {
AlwaysConstant,
AlwaysTrue,
AlwaysFalse,
AlwaysEqual, // std::strong_ordering::equal from operator<=>
};
// C++2a [depr.array.comp]:
// Equality and relational comparisons ([expr.eq], [expr.rel]) between two
// operands of array type are deprecated.
if (S.getLangOpts().CPlusPlus20 && LHSStripped->getType()->isArrayType() &&
RHSStripped->getType()->isArrayType()) {
S.Diag(Loc, diag::warn_depr_array_comparison)
<< LHS->getSourceRange() << RHS->getSourceRange()
<< LHSStripped->getType() << RHSStripped->getType();
// Carry on to produce the tautological comparison warning, if this
// expression is potentially-evaluated, we can resolve the array to a
// non-weak declaration, and so on.
}
if (!LHS->getBeginLoc().isMacroID() && !RHS->getBeginLoc().isMacroID()) {
if (Expr::isSameComparisonOperand(LHS, RHS)) {
unsigned Result;
switch (Opc) {
case BO_EQ:
case BO_LE:
case BO_GE:
Result = AlwaysTrue;
break;
case BO_NE:
case BO_LT:
case BO_GT:
Result = AlwaysFalse;
break;
case BO_Cmp:
Result = AlwaysEqual;
break;
default:
Result = AlwaysConstant;
break;
}
S.DiagRuntimeBehavior(Loc, nullptr,
S.PDiag(diag::warn_comparison_always)
<< 0 /*self-comparison*/
<< Result);
} else if (checkForArray(LHSStripped) && checkForArray(RHSStripped)) {
// What is it always going to evaluate to?
unsigned Result;
switch (Opc) {
case BO_EQ: // e.g. array1 == array2
Result = AlwaysFalse;
break;
case BO_NE: // e.g. array1 != array2
Result = AlwaysTrue;
break;
default: // e.g. array1 <= array2
// The best we can say is 'a constant'
Result = AlwaysConstant;
break;
}
S.DiagRuntimeBehavior(Loc, nullptr,
S.PDiag(diag::warn_comparison_always)
<< 1 /*array comparison*/
<< Result);
}
}
if (isa<CastExpr>(LHSStripped))
LHSStripped = LHSStripped->IgnoreParenCasts();
if (isa<CastExpr>(RHSStripped))
RHSStripped = RHSStripped->IgnoreParenCasts();
// Warn about comparisons against a string constant (unless the other
// operand is null); the user probably wants string comparison function.
Expr *LiteralString = nullptr;
Expr *LiteralStringStripped = nullptr;
if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
!RHSStripped->isNullPointerConstant(S.Context,
Expr::NPC_ValueDependentIsNull)) {
LiteralString = LHS;
LiteralStringStripped = LHSStripped;
} else if ((isa<StringLiteral>(RHSStripped) ||
isa<ObjCEncodeExpr>(RHSStripped)) &&
!LHSStripped->isNullPointerConstant(S.Context,
Expr::NPC_ValueDependentIsNull)) {
LiteralString = RHS;
LiteralStringStripped = RHSStripped;
}
if (LiteralString) {
S.DiagRuntimeBehavior(Loc, nullptr,
S.PDiag(diag::warn_stringcompare)
<< isa<ObjCEncodeExpr>(LiteralStringStripped)
<< LiteralString->getSourceRange());
}
}
static ImplicitConversionKind castKindToImplicitConversionKind(CastKind CK) {
switch (CK) {
default: {
#ifndef NDEBUG
llvm::errs() << "unhandled cast kind: " << CastExpr::getCastKindName(CK)
<< "\n";
#endif
llvm_unreachable("unhandled cast kind");
}
case CK_UserDefinedConversion:
return ICK_Identity;
case CK_LValueToRValue:
return ICK_Lvalue_To_Rvalue;
case CK_ArrayToPointerDecay:
return ICK_Array_To_Pointer;
case CK_FunctionToPointerDecay:
return ICK_Function_To_Pointer;
case CK_IntegralCast:
return ICK_Integral_Conversion;
case CK_FloatingCast:
return ICK_Floating_Conversion;
case CK_IntegralToFloating:
case CK_FloatingToIntegral:
return ICK_Floating_Integral;
case CK_IntegralComplexCast:
case CK_FloatingComplexCast:
case CK_FloatingComplexToIntegralComplex:
case CK_IntegralComplexToFloatingComplex:
return ICK_Complex_Conversion;
case CK_FloatingComplexToReal:
case CK_FloatingRealToComplex:
case CK_IntegralComplexToReal:
case CK_IntegralRealToComplex:
return ICK_Complex_Real;
}
}
static bool checkThreeWayNarrowingConversion(Sema &S, QualType ToType, Expr *E,
QualType FromType,
SourceLocation Loc) {
// Check for a narrowing implicit conversion.
StandardConversionSequence SCS;
SCS.setAsIdentityConversion();
SCS.setToType(0, FromType);
SCS.setToType(1, ToType);
if (const auto *ICE = dyn_cast<ImplicitCastExpr>(E))
SCS.Second = castKindToImplicitConversionKind(ICE->getCastKind());
APValue PreNarrowingValue;
QualType PreNarrowingType;
switch (SCS.getNarrowingKind(S.Context, E, PreNarrowingValue,
PreNarrowingType,
/*IgnoreFloatToIntegralConversion*/ true)) {
case NK_Dependent_Narrowing:
// Implicit conversion to a narrower type, but the expression is
// value-dependent so we can't tell whether it's actually narrowing.
case NK_Not_Narrowing:
return false;
case NK_Constant_Narrowing:
// Implicit conversion to a narrower type, and the value is not a constant
// expression.
S.Diag(E->getBeginLoc(), diag::err_spaceship_argument_narrowing)
<< /*Constant*/ 1
<< PreNarrowingValue.getAsString(S.Context, PreNarrowingType) << ToType;
return true;
case NK_Variable_Narrowing:
// Implicit conversion to a narrower type, and the value is not a constant
// expression.
case NK_Type_Narrowing:
S.Diag(E->getBeginLoc(), diag::err_spaceship_argument_narrowing)
<< /*Constant*/ 0 << FromType << ToType;
// TODO: It's not a constant expression, but what if the user intended it
// to be? Can we produce notes to help them figure out why it isn't?
return true;
}
llvm_unreachable("unhandled case in switch");
}
static QualType checkArithmeticOrEnumeralThreeWayCompare(Sema &S,
ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc) {
QualType LHSType = LHS.get()->getType();
QualType RHSType = RHS.get()->getType();
// Dig out the original argument type and expression before implicit casts
// were applied. These are the types/expressions we need to check the
// [expr.spaceship] requirements against.
ExprResult LHSStripped = LHS.get()->IgnoreParenImpCasts();
ExprResult RHSStripped = RHS.get()->IgnoreParenImpCasts();
QualType LHSStrippedType = LHSStripped.get()->getType();
QualType RHSStrippedType = RHSStripped.get()->getType();
// C++2a [expr.spaceship]p3: If one of the operands is of type bool and the
// other is not, the program is ill-formed.
if (LHSStrippedType->isBooleanType() != RHSStrippedType->isBooleanType()) {
S.InvalidOperands(Loc, LHSStripped, RHSStripped);
return QualType();
}
// FIXME: Consider combining this with checkEnumArithmeticConversions.
int NumEnumArgs = (int)LHSStrippedType->isEnumeralType() +
RHSStrippedType->isEnumeralType();
if (NumEnumArgs == 1) {
bool LHSIsEnum = LHSStrippedType->isEnumeralType();
QualType OtherTy = LHSIsEnum ? RHSStrippedType : LHSStrippedType;
if (OtherTy->hasFloatingRepresentation()) {
S.InvalidOperands(Loc, LHSStripped, RHSStripped);
return QualType();
}
}
if (NumEnumArgs == 2) {
// C++2a [expr.spaceship]p5: If both operands have the same enumeration
// type E, the operator yields the result of converting the operands
// to the underlying type of E and applying <=> to the converted operands.
if (!S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType)) {
S.InvalidOperands(Loc, LHS, RHS);
return QualType();
}
QualType IntType =
LHSStrippedType->castAs<EnumType>()->getDecl()->getIntegerType();
assert(IntType->isArithmeticType());
// We can't use `CK_IntegralCast` when the underlying type is 'bool', so we
// promote the boolean type, and all other promotable integer types, to
// avoid this.
if (S.Context.isPromotableIntegerType(IntType))
IntType = S.Context.getPromotedIntegerType(IntType);
LHS = S.ImpCastExprToType(LHS.get(), IntType, CK_IntegralCast);
RHS = S.ImpCastExprToType(RHS.get(), IntType, CK_IntegralCast);
LHSType = RHSType = IntType;
}
// C++2a [expr.spaceship]p4: If both operands have arithmetic types, the
// usual arithmetic conversions are applied to the operands.
QualType Type =
S.UsualArithmeticConversions(LHS, RHS, Loc, Sema::ACK_Comparison);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
if (Type.isNull())
return S.InvalidOperands(Loc, LHS, RHS);
std::optional<ComparisonCategoryType> CCT =
getComparisonCategoryForBuiltinCmp(Type);
if (!CCT)
return S.InvalidOperands(Loc, LHS, RHS);
bool HasNarrowing = checkThreeWayNarrowingConversion(
S, Type, LHS.get(), LHSType, LHS.get()->getBeginLoc());
HasNarrowing |= checkThreeWayNarrowingConversion(S, Type, RHS.get(), RHSType,
RHS.get()->getBeginLoc());
if (HasNarrowing)
return QualType();
assert(!Type.isNull() && "composite type for <=> has not been set");
return S.CheckComparisonCategoryType(
*CCT, Loc, Sema::ComparisonCategoryUsage::OperatorInExpression);
}
static QualType checkArithmeticOrEnumeralCompare(Sema &S, ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc,
BinaryOperatorKind Opc) {
if (Opc == BO_Cmp)
return checkArithmeticOrEnumeralThreeWayCompare(S, LHS, RHS, Loc);
// C99 6.5.8p3 / C99 6.5.9p4
QualType Type =
S.UsualArithmeticConversions(LHS, RHS, Loc, Sema::ACK_Comparison);
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
if (Type.isNull())
return S.InvalidOperands(Loc, LHS, RHS);
assert(Type->isArithmeticType() || Type->isEnumeralType());
if (Type->isAnyComplexType() && BinaryOperator::isRelationalOp(Opc))
return S.InvalidOperands(Loc, LHS, RHS);
// Check for comparisons of floating point operands using != and ==.
if (Type->hasFloatingRepresentation())
S.CheckFloatComparison(Loc, LHS.get(), RHS.get(), Opc);
// The result of comparisons is 'bool' in C++, 'int' in C.
return S.Context.getLogicalOperationType();
}
void Sema::CheckPtrComparisonWithNullChar(ExprResult &E, ExprResult &NullE) {
if (!NullE.get()->getType()->isAnyPointerType())
return;
int NullValue = PP.isMacroDefined("NULL") ? 0 : 1;
if (!E.get()->getType()->isAnyPointerType() &&
E.get()->isNullPointerConstant(Context,
Expr::NPC_ValueDependentIsNotNull) ==
Expr::NPCK_ZeroExpression) {
if (const auto *CL = dyn_cast<CharacterLiteral>(E.get())) {
if (CL->getValue() == 0)
Diag(E.get()->getExprLoc(), diag::warn_pointer_compare)
<< NullValue
<< FixItHint::CreateReplacement(E.get()->getExprLoc(),
NullValue ? "NULL" : "(void *)0");
} else if (const auto *CE = dyn_cast<CStyleCastExpr>(E.get())) {
TypeSourceInfo *TI = CE->getTypeInfoAsWritten();
QualType T = Context.getCanonicalType(TI->getType()).getUnqualifiedType();
if (T == Context.CharTy)
Diag(E.get()->getExprLoc(), diag::warn_pointer_compare)
<< NullValue
<< FixItHint::CreateReplacement(E.get()->getExprLoc(),
NullValue ? "NULL" : "(void *)0");
}
}
}
// C99 6.5.8, C++ [expr.rel]
QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
BinaryOperatorKind Opc) {
bool IsRelational = BinaryOperator::isRelationalOp(Opc);
bool IsThreeWay = Opc == BO_Cmp;
bool IsOrdered = IsRelational || IsThreeWay;
auto IsAnyPointerType = [](ExprResult E) {
QualType Ty = E.get()->getType();
return Ty->isPointerType() || Ty->isMemberPointerType();
};
// C++2a [expr.spaceship]p6: If at least one of the operands is of pointer
// type, array-to-pointer, ..., conversions are performed on both operands to
// bring them to their composite type.
// Otherwise, all comparisons expect an rvalue, so convert to rvalue before
// any type-related checks.
if (!IsThreeWay || IsAnyPointerType(LHS) || IsAnyPointerType(RHS)) {
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
} else {
LHS = DefaultLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
RHS = DefaultLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
}
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/true);
if (!getLangOpts().CPlusPlus && BinaryOperator::isEqualityOp(Opc)) {
CheckPtrComparisonWithNullChar(LHS, RHS);
CheckPtrComparisonWithNullChar(RHS, LHS);
}
// Handle vector comparisons separately.
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType())
return CheckVectorCompareOperands(LHS, RHS, Loc, Opc);
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType())
return CheckSizelessVectorCompareOperands(LHS, RHS, Loc, Opc);
diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
QualType LHSType = LHS.get()->getType();
QualType RHSType = RHS.get()->getType();
if ((LHSType->isArithmeticType() || LHSType->isEnumeralType()) &&
(RHSType->isArithmeticType() || RHSType->isEnumeralType()))
return checkArithmeticOrEnumeralCompare(*this, LHS, RHS, Loc, Opc);
if ((LHSType->isPointerType() &&
LHSType->getPointeeType().isWebAssemblyReferenceType()) ||
(RHSType->isPointerType() &&
RHSType->getPointeeType().isWebAssemblyReferenceType()))
return InvalidOperands(Loc, LHS, RHS);
const Expr::NullPointerConstantKind LHSNullKind =
LHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
const Expr::NullPointerConstantKind RHSNullKind =
RHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
bool LHSIsNull = LHSNullKind != Expr::NPCK_NotNull;
bool RHSIsNull = RHSNullKind != Expr::NPCK_NotNull;
auto computeResultTy = [&]() {
if (Opc != BO_Cmp)
return Context.getLogicalOperationType();
assert(getLangOpts().CPlusPlus);
assert(Context.hasSameType(LHS.get()->getType(), RHS.get()->getType()));
QualType CompositeTy = LHS.get()->getType();
assert(!CompositeTy->isReferenceType());
std::optional<ComparisonCategoryType> CCT =
getComparisonCategoryForBuiltinCmp(CompositeTy);
if (!CCT)
return InvalidOperands(Loc, LHS, RHS);
if (CompositeTy->isPointerType() && LHSIsNull != RHSIsNull) {
// P0946R0: Comparisons between a null pointer constant and an object
// pointer result in std::strong_equality, which is ill-formed under
// P1959R0.
Diag(Loc, diag::err_typecheck_three_way_comparison_of_pointer_and_zero)
<< (LHSIsNull ? LHS.get()->getSourceRange()
: RHS.get()->getSourceRange());
return QualType();
}
return CheckComparisonCategoryType(
*CCT, Loc, ComparisonCategoryUsage::OperatorInExpression);
};
if (!IsOrdered && LHSIsNull != RHSIsNull) {
bool IsEquality = Opc == BO_EQ;
if (RHSIsNull)
DiagnoseAlwaysNonNullPointer(LHS.get(), RHSNullKind, IsEquality,
RHS.get()->getSourceRange());
else
DiagnoseAlwaysNonNullPointer(RHS.get(), LHSNullKind, IsEquality,
LHS.get()->getSourceRange());
}
if (IsOrdered && LHSType->isFunctionPointerType() &&
RHSType->isFunctionPointerType()) {
// Valid unless a relational comparison of function pointers
bool IsError = Opc == BO_Cmp;
auto DiagID =
IsError ? diag::err_typecheck_ordered_comparison_of_function_pointers
: getLangOpts().CPlusPlus
? diag::warn_typecheck_ordered_comparison_of_function_pointers
: diag::ext_typecheck_ordered_comparison_of_function_pointers;
Diag(Loc, DiagID) << LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
if (IsError)
return QualType();
}
if ((LHSType->isIntegerType() && !LHSIsNull) ||
(RHSType->isIntegerType() && !RHSIsNull)) {
// Skip normal pointer conversion checks in this case; we have better
// diagnostics for this below.
} else if (getLangOpts().CPlusPlus) {
// Equality comparison of a function pointer to a void pointer is invalid,
// but we allow it as an extension.
// FIXME: If we really want to allow this, should it be part of composite
// pointer type computation so it works in conditionals too?
if (!IsOrdered &&
((LHSType->isFunctionPointerType() && RHSType->isVoidPointerType()) ||
(RHSType->isFunctionPointerType() && LHSType->isVoidPointerType()))) {
// This is a gcc extension compatibility comparison.
// In a SFINAE context, we treat this as a hard error to maintain
// conformance with the C++ standard.
diagnoseFunctionPointerToVoidComparison(
*this, Loc, LHS, RHS, /*isError*/ (bool)isSFINAEContext());
if (isSFINAEContext())
return QualType();
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
return computeResultTy();
}
// C++ [expr.eq]p2:
// If at least one operand is a pointer [...] bring them to their
// composite pointer type.
// C++ [expr.spaceship]p6
// If at least one of the operands is of pointer type, [...] bring them
// to their composite pointer type.
// C++ [expr.rel]p2:
// If both operands are pointers, [...] bring them to their composite
// pointer type.
// For <=>, the only valid non-pointer types are arrays and functions, and
// we already decayed those, so this is really the same as the relational
// comparison rule.
if ((int)LHSType->isPointerType() + (int)RHSType->isPointerType() >=
(IsOrdered ? 2 : 1) &&
(!LangOpts.ObjCAutoRefCount || !(LHSType->isObjCObjectPointerType() ||
RHSType->isObjCObjectPointerType()))) {
if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
return QualType();
return computeResultTy();
}
} else if (LHSType->isPointerType() &&
RHSType->isPointerType()) { // C99 6.5.8p2
// All of the following pointer-related warnings are GCC extensions, except
// when handling null pointer constants.
QualType LCanPointeeTy =
LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
QualType RCanPointeeTy =
RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
// C99 6.5.9p2 and C99 6.5.8p2
if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
RCanPointeeTy.getUnqualifiedType())) {
if (IsRelational) {
// Pointers both need to point to complete or incomplete types
if ((LCanPointeeTy->isIncompleteType() !=
RCanPointeeTy->isIncompleteType()) &&
!getLangOpts().C11) {
Diag(Loc, diag::ext_typecheck_compare_complete_incomplete_pointers)
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange()
<< LHSType << RHSType << LCanPointeeTy->isIncompleteType()
<< RCanPointeeTy->isIncompleteType();
}
}
} else if (!IsRelational &&
(LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
// Valid unless comparison between non-null pointer and function pointer
if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
&& !LHSIsNull && !RHSIsNull)
diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
/*isError*/false);
} else {
// Invalid
diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
}
if (LCanPointeeTy != RCanPointeeTy) {
// Treat NULL constant as a special case in OpenCL.
if (getLangOpts().OpenCL && !LHSIsNull && !RHSIsNull) {
if (!LCanPointeeTy.isAddressSpaceOverlapping(RCanPointeeTy)) {
Diag(Loc,
diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
<< LHSType << RHSType << 0 /* comparison */
<< LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
}
}
LangAS AddrSpaceL = LCanPointeeTy.getAddressSpace();
LangAS AddrSpaceR = RCanPointeeTy.getAddressSpace();
CastKind Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion
: CK_BitCast;
if (LHSIsNull && !RHSIsNull)
LHS = ImpCastExprToType(LHS.get(), RHSType, Kind);
else
RHS = ImpCastExprToType(RHS.get(), LHSType, Kind);
}
return computeResultTy();
}
// C++ [expr.eq]p4:
// Two operands of type std::nullptr_t or one operand of type
// std::nullptr_t and the other a null pointer constant compare
// equal.
// C23 6.5.9p5:
// If both operands have type nullptr_t or one operand has type nullptr_t
// and the other is a null pointer constant, they compare equal if the
// former is a null pointer.
if (!IsOrdered && LHSIsNull && RHSIsNull) {
if (LHSType->isNullPtrType()) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
return computeResultTy();
}
if (RHSType->isNullPtrType()) {
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
return computeResultTy();
}
}
if (!getLangOpts().CPlusPlus && !IsOrdered && (LHSIsNull || RHSIsNull)) {
// C23 6.5.9p6:
// Otherwise, at least one operand is a pointer. If one is a pointer and
// the other is a null pointer constant or has type nullptr_t, they
// compare equal
if (LHSIsNull && RHSType->isPointerType()) {
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
return computeResultTy();
}
if (RHSIsNull && LHSType->isPointerType()) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
return computeResultTy();
}
}
// Comparison of Objective-C pointers and block pointers against nullptr_t.
// These aren't covered by the composite pointer type rules.
if (!IsOrdered && RHSType->isNullPtrType() &&
(LHSType->isObjCObjectPointerType() || LHSType->isBlockPointerType())) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
return computeResultTy();
}
if (!IsOrdered && LHSType->isNullPtrType() &&
(RHSType->isObjCObjectPointerType() || RHSType->isBlockPointerType())) {
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
return computeResultTy();
}
if (getLangOpts().CPlusPlus) {
if (IsRelational &&
((LHSType->isNullPtrType() && RHSType->isPointerType()) ||
(RHSType->isNullPtrType() && LHSType->isPointerType()))) {
// HACK: Relational comparison of nullptr_t against a pointer type is
// invalid per DR583, but we allow it within std::less<> and friends,
// since otherwise common uses of it break.
// FIXME: Consider removing this hack once LWG fixes std::less<> and
// friends to have std::nullptr_t overload candidates.
DeclContext *DC = CurContext;
if (isa<FunctionDecl>(DC))
DC = DC->getParent();
if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
if (CTSD->isInStdNamespace() &&
llvm::StringSwitch<bool>(CTSD->getName())
.Cases("less", "less_equal", "greater", "greater_equal", true)
.Default(false)) {
if (RHSType->isNullPtrType())
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
else
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
return computeResultTy();
}
}
}
// C++ [expr.eq]p2:
// If at least one operand is a pointer to member, [...] bring them to
// their composite pointer type.
if (!IsOrdered &&
(LHSType->isMemberPointerType() || RHSType->isMemberPointerType())) {
if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
return QualType();
else
return computeResultTy();
}
}
// Handle block pointer types.
if (!IsOrdered && LHSType->isBlockPointerType() &&
RHSType->isBlockPointerType()) {
QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();
if (!LHSIsNull && !RHSIsNull &&
!Context.typesAreCompatible(lpointee, rpointee)) {
Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
}
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
return computeResultTy();
}
// Allow block pointers to be compared with null pointer constants.
if (!IsOrdered
&& ((LHSType->isBlockPointerType() && RHSType->isPointerType())
|| (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
if (!LHSIsNull && !RHSIsNull) {
if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
->getPointeeType()->isVoidType())
|| (LHSType->isPointerType() && LHSType->castAs<PointerType>()
->getPointeeType()->isVoidType())))
Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
}
if (LHSIsNull && !RHSIsNull)
LHS = ImpCastExprToType(LHS.get(), RHSType,
RHSType->isPointerType() ? CK_BitCast
: CK_AnyPointerToBlockPointerCast);
else
RHS = ImpCastExprToType(RHS.get(), LHSType,
LHSType->isPointerType() ? CK_BitCast
: CK_AnyPointerToBlockPointerCast);
return computeResultTy();
}
if (LHSType->isObjCObjectPointerType() ||
RHSType->isObjCObjectPointerType()) {
const PointerType *LPT = LHSType->getAs<PointerType>();
const PointerType *RPT = RHSType->getAs<PointerType>();
if (LPT || RPT) {
bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
if (!LPtrToVoid && !RPtrToVoid &&
!Context.typesAreCompatible(LHSType, RHSType)) {
diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
/*isError*/false);
}
// FIXME: If LPtrToVoid, we should presumably convert the LHS rather than
// the RHS, but we have test coverage for this behavior.
// FIXME: Consider using convertPointersToCompositeType in C++.
if (LHSIsNull && !RHSIsNull) {
Expr *E = LHS.get();
if (getLangOpts().ObjCAutoRefCount)
CheckObjCConversion(SourceRange(), RHSType, E,
CCK_ImplicitConversion);
LHS = ImpCastExprToType(E, RHSType,
RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
}
else {
Expr *E = RHS.get();
if (getLangOpts().ObjCAutoRefCount)
CheckObjCConversion(SourceRange(), LHSType, E, CCK_ImplicitConversion,
/*Diagnose=*/true,
/*DiagnoseCFAudited=*/false, Opc);
RHS = ImpCastExprToType(E, LHSType,
LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
}
return computeResultTy();
}
if (LHSType->isObjCObjectPointerType() &&
RHSType->isObjCObjectPointerType()) {
if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
/*isError*/false);
if (isObjCObjectLiteral(LHS) || isObjCObjectLiteral(RHS))
diagnoseObjCLiteralComparison(*this, Loc, LHS, RHS, Opc);
if (LHSIsNull && !RHSIsNull)
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
else
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
return computeResultTy();
}
if (!IsOrdered && LHSType->isBlockPointerType() &&
RHSType->isBlockCompatibleObjCPointerType(Context)) {
LHS = ImpCastExprToType(LHS.get(), RHSType,
CK_BlockPointerToObjCPointerCast);
return computeResultTy();
} else if (!IsOrdered &&
LHSType->isBlockCompatibleObjCPointerType(Context) &&
RHSType->isBlockPointerType()) {
RHS = ImpCastExprToType(RHS.get(), LHSType,
CK_BlockPointerToObjCPointerCast);
return computeResultTy();
}
}
if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
(LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
unsigned DiagID = 0;
bool isError = false;
if (LangOpts.DebuggerSupport) {
// Under a debugger, allow the comparison of pointers to integers,
// since users tend to want to compare addresses.
} else if ((LHSIsNull && LHSType->isIntegerType()) ||
(RHSIsNull && RHSType->isIntegerType())) {
if (IsOrdered) {
isError = getLangOpts().CPlusPlus;
DiagID =
isError ? diag::err_typecheck_ordered_comparison_of_pointer_and_zero
: diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
}
} else if (getLangOpts().CPlusPlus) {
DiagID = diag::err_typecheck_comparison_of_pointer_integer;
isError = true;
} else if (IsOrdered)
DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
else
DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
if (DiagID) {
Diag(Loc, DiagID)
<< LHSType << RHSType << LHS.get()->getSourceRange()
<< RHS.get()->getSourceRange();
if (isError)
return QualType();
}
if (LHSType->isIntegerType())
LHS = ImpCastExprToType(LHS.get(), RHSType,
LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
else
RHS = ImpCastExprToType(RHS.get(), LHSType,
RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
return computeResultTy();
}
// Handle block pointers.
if (!IsOrdered && RHSIsNull
&& LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
return computeResultTy();
}
if (!IsOrdered && LHSIsNull
&& LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
return computeResultTy();
}
if (getLangOpts().getOpenCLCompatibleVersion() >= 200) {
if (LHSType->isClkEventT() && RHSType->isClkEventT()) {
return computeResultTy();
}
if (LHSType->isQueueT() && RHSType->isQueueT()) {
return computeResultTy();
}
if (LHSIsNull && RHSType->isQueueT()) {
LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
return computeResultTy();
}
if (LHSType->isQueueT() && RHSIsNull) {
RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
return computeResultTy();
}
}
return InvalidOperands(Loc, LHS, RHS);
}
// Return a signed ext_vector_type that is of identical size and number of
// elements. For floating point vectors, return an integer type of identical
// size and number of elements. In the non ext_vector_type case, search from
// the largest type to the smallest type to avoid cases where long long == long,
// where long gets picked over long long.
QualType Sema::GetSignedVectorType(QualType V) {
const VectorType *VTy = V->castAs<VectorType>();
unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
if (isa<ExtVectorType>(VTy)) {
if (VTy->isExtVectorBoolType())
return Context.getExtVectorType(Context.BoolTy, VTy->getNumElements());
if (TypeSize == Context.getTypeSize(Context.CharTy))
return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
if (TypeSize == Context.getTypeSize(Context.ShortTy))
return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
if (TypeSize == Context.getTypeSize(Context.IntTy))
return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
if (TypeSize == Context.getTypeSize(Context.Int128Ty))
return Context.getExtVectorType(Context.Int128Ty, VTy->getNumElements());
if (TypeSize == Context.getTypeSize(Context.LongTy))
return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
"Unhandled vector element size in vector compare");
return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
}
if (TypeSize == Context.getTypeSize(Context.Int128Ty))
return Context.getVectorType(Context.Int128Ty, VTy->getNumElements(),
VectorKind::Generic);
if (TypeSize == Context.getTypeSize(Context.LongLongTy))
return Context.getVectorType(Context.LongLongTy, VTy->getNumElements(),
VectorKind::Generic);
if (TypeSize == Context.getTypeSize(Context.LongTy))
return Context.getVectorType(Context.LongTy, VTy->getNumElements(),
VectorKind::Generic);
if (TypeSize == Context.getTypeSize(Context.IntTy))
return Context.getVectorType(Context.IntTy, VTy->getNumElements(),
VectorKind::Generic);
if (TypeSize == Context.getTypeSize(Context.ShortTy))
return Context.getVectorType(Context.ShortTy, VTy->getNumElements(),
VectorKind::Generic);
assert(TypeSize == Context.getTypeSize(Context.CharTy) &&
"Unhandled vector element size in vector compare");
return Context.getVectorType(Context.CharTy, VTy->getNumElements(),
VectorKind::Generic);
}
QualType Sema::GetSignedSizelessVectorType(QualType V) {
const BuiltinType *VTy = V->castAs<BuiltinType>();
assert(VTy->isSizelessBuiltinType() && "expected sizeless type");
const QualType ETy = V->getSveEltType(Context);
const auto TypeSize = Context.getTypeSize(ETy);
const QualType IntTy = Context.getIntTypeForBitwidth(TypeSize, true);
const llvm::ElementCount VecSize = Context.getBuiltinVectorTypeInfo(VTy).EC;
return Context.getScalableVectorType(IntTy, VecSize.getKnownMinValue());
}
/// CheckVectorCompareOperands - vector comparisons are a clang extension that
/// operates on extended vector types. Instead of producing an IntTy result,
/// like a scalar comparison, a vector comparison produces a vector of integer
/// types.
QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
BinaryOperatorKind Opc) {
if (Opc == BO_Cmp) {
Diag(Loc, diag::err_three_way_vector_comparison);
return QualType();
}
// Check to make sure we're operating on vectors of the same type and width,
// Allowing one side to be a scalar of element type.
QualType vType =
CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/ false,
/*AllowBothBool*/ true,
/*AllowBoolConversions*/ getLangOpts().ZVector,
/*AllowBooleanOperation*/ true,
/*ReportInvalid*/ true);
if (vType.isNull())
return vType;
QualType LHSType = LHS.get()->getType();
// Determine the return type of a vector compare. By default clang will return
// a scalar for all vector compares except vector bool and vector pixel.
// With the gcc compiler we will always return a vector type and with the xl
// compiler we will always return a scalar type. This switch allows choosing
// which behavior is prefered.
if (getLangOpts().AltiVec) {
switch (getLangOpts().getAltivecSrcCompat()) {
case LangOptions::AltivecSrcCompatKind::Mixed:
// If AltiVec, the comparison results in a numeric type, i.e.
// bool for C++, int for C
if (vType->castAs<VectorType>()->getVectorKind() ==
VectorKind::AltiVecVector)
return Context.getLogicalOperationType();
else
Diag(Loc, diag::warn_deprecated_altivec_src_compat);
break;
case LangOptions::AltivecSrcCompatKind::GCC:
// For GCC we always return the vector type.
break;
case LangOptions::AltivecSrcCompatKind::XL:
return Context.getLogicalOperationType();
break;
}
}
// For non-floating point types, check for self-comparisons of the form
// x == x, x != x, x < x, etc. These always evaluate to a constant, and
// often indicate logic errors in the program.
diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
// Check for comparisons of floating point operands using != and ==.
if (LHSType->hasFloatingRepresentation()) {
assert(RHS.get()->getType()->hasFloatingRepresentation());
CheckFloatComparison(Loc, LHS.get(), RHS.get(), Opc);
}
// Return a signed type for the vector.
return GetSignedVectorType(vType);
}
QualType Sema::CheckSizelessVectorCompareOperands(ExprResult &LHS,
ExprResult &RHS,
SourceLocation Loc,
BinaryOperatorKind Opc) {
if (Opc == BO_Cmp) {
Diag(Loc, diag::err_three_way_vector_comparison);
return QualType();
}
// Check to make sure we're operating on vectors of the same type and width,
// Allowing one side to be a scalar of element type.
QualType vType = CheckSizelessVectorOperands(
LHS, RHS, Loc, /*isCompAssign*/ false, ACK_Comparison);
if (vType.isNull())
return vType;
QualType LHSType = LHS.get()->getType();
// For non-floating point types, check for self-comparisons of the form
// x == x, x != x, x < x, etc. These always evaluate to a constant, and
// often indicate logic errors in the program.
diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
// Check for comparisons of floating point operands using != and ==.
if (LHSType->hasFloatingRepresentation()) {
assert(RHS.get()->getType()->hasFloatingRepresentation());
CheckFloatComparison(Loc, LHS.get(), RHS.get(), Opc);
}
const BuiltinType *LHSBuiltinTy = LHSType->getAs<BuiltinType>();
const BuiltinType *RHSBuiltinTy = RHS.get()->getType()->getAs<BuiltinType>();
if (LHSBuiltinTy && RHSBuiltinTy && LHSBuiltinTy->isSVEBool() &&
RHSBuiltinTy->isSVEBool())
return LHSType;
// Return a signed type for the vector.
return GetSignedSizelessVectorType(vType);
}
static void diagnoseXorMisusedAsPow(Sema &S, const ExprResult &XorLHS,
const ExprResult &XorRHS,
const SourceLocation Loc) {
// Do not diagnose macros.
if (Loc.isMacroID())
return;
// Do not diagnose if both LHS and RHS are macros.
if (XorLHS.get()->getExprLoc().isMacroID() &&
XorRHS.get()->getExprLoc().isMacroID())
return;
bool Negative = false;
bool ExplicitPlus = false;
const auto *LHSInt = dyn_cast<IntegerLiteral>(XorLHS.get());
const auto *RHSInt = dyn_cast<IntegerLiteral>(XorRHS.get());
if (!LHSInt)
return;
if (!RHSInt) {
// Check negative literals.
if (const auto *UO = dyn_cast<UnaryOperator>(XorRHS.get())) {
UnaryOperatorKind Opc = UO->getOpcode();
if (Opc != UO_Minus && Opc != UO_Plus)
return;
RHSInt = dyn_cast<IntegerLiteral>(UO->getSubExpr());
if (!RHSInt)
return;
Negative = (Opc == UO_Minus);
ExplicitPlus = !Negative;
} else {
return;
}
}
const llvm::APInt &LeftSideValue = LHSInt->getValue();
llvm::APInt RightSideValue = RHSInt->getValue();
if (LeftSideValue != 2 && LeftSideValue != 10)
return;
if (LeftSideValue.getBitWidth() != RightSideValue.getBitWidth())
return;
CharSourceRange ExprRange = CharSourceRange::getCharRange(
LHSInt->getBeginLoc(), S.getLocForEndOfToken(RHSInt->getLocation()));
llvm::StringRef ExprStr =
Lexer::getSourceText(ExprRange, S.getSourceManager(), S.getLangOpts());
CharSourceRange XorRange =
CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
llvm::StringRef XorStr =
Lexer::getSourceText(XorRange, S.getSourceManager(), S.getLangOpts());
// Do not diagnose if xor keyword/macro is used.
if (XorStr == "xor")
return;
std::string LHSStr = std::string(Lexer::getSourceText(
CharSourceRange::getTokenRange(LHSInt->getSourceRange()),
S.getSourceManager(), S.getLangOpts()));
std::string RHSStr = std::string(Lexer::getSourceText(
CharSourceRange::getTokenRange(RHSInt->getSourceRange()),
S.getSourceManager(), S.getLangOpts()));
if (Negative) {
RightSideValue = -RightSideValue;
RHSStr = "-" + RHSStr;
} else if (ExplicitPlus) {
RHSStr = "+" + RHSStr;
}
StringRef LHSStrRef = LHSStr;
StringRef RHSStrRef = RHSStr;
// Do not diagnose literals with digit separators, binary, hexadecimal, octal
// literals.
if (LHSStrRef.starts_with("0b") || LHSStrRef.starts_with("0B") ||
RHSStrRef.starts_with("0b") || RHSStrRef.starts_with("0B") ||
LHSStrRef.starts_with("0x") || LHSStrRef.starts_with("0X") ||
RHSStrRef.starts_with("0x") || RHSStrRef.starts_with("0X") ||
(LHSStrRef.size() > 1 && LHSStrRef.starts_with("0")) ||
(RHSStrRef.size() > 1 && RHSStrRef.starts_with("0")) ||
LHSStrRef.contains('\'') || RHSStrRef.contains('\''))
return;
bool SuggestXor =
S.getLangOpts().CPlusPlus || S.getPreprocessor().isMacroDefined("xor");
const llvm::APInt XorValue = LeftSideValue ^ RightSideValue;
int64_t RightSideIntValue = RightSideValue.getSExtValue();
if (LeftSideValue == 2 && RightSideIntValue >= 0) {
std::string SuggestedExpr = "1 << " + RHSStr;
bool Overflow = false;
llvm::APInt One = (LeftSideValue - 1);
llvm::APInt PowValue = One.sshl_ov(RightSideValue, Overflow);
if (Overflow) {
if (RightSideIntValue < 64)
S.Diag(Loc, diag::warn_xor_used_as_pow_base)
<< ExprStr << toString(XorValue, 10, true) << ("1LL << " + RHSStr)
<< FixItHint::CreateReplacement(ExprRange, "1LL << " + RHSStr);
else if (RightSideIntValue == 64)
S.Diag(Loc, diag::warn_xor_used_as_pow)
<< ExprStr << toString(XorValue, 10, true);
else
return;
} else {
S.Diag(Loc, diag::warn_xor_used_as_pow_base_extra)
<< ExprStr << toString(XorValue, 10, true) << SuggestedExpr
<< toString(PowValue, 10, true)
<< FixItHint::CreateReplacement(
ExprRange, (RightSideIntValue == 0) ? "1" : SuggestedExpr);
}
S.Diag(Loc, diag::note_xor_used_as_pow_silence)
<< ("0x2 ^ " + RHSStr) << SuggestXor;
} else if (LeftSideValue == 10) {
std::string SuggestedValue = "1e" + std::to_string(RightSideIntValue);
S.Diag(Loc, diag::warn_xor_used_as_pow_base)
<< ExprStr << toString(XorValue, 10, true) << SuggestedValue
<< FixItHint::CreateReplacement(ExprRange, SuggestedValue);
S.Diag(Loc, diag::note_xor_used_as_pow_silence)
<< ("0xA ^ " + RHSStr) << SuggestXor;
}
}
QualType Sema::CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc) {
// Ensure that either both operands are of the same vector type, or
// one operand is of a vector type and the other is of its element type.
QualType vType = CheckVectorOperands(LHS, RHS, Loc, false,
/*AllowBothBool*/ true,
/*AllowBoolConversions*/ false,
/*AllowBooleanOperation*/ false,
/*ReportInvalid*/ false);
if (vType.isNull())
return InvalidOperands(Loc, LHS, RHS);
if (getLangOpts().OpenCL &&
getLangOpts().getOpenCLCompatibleVersion() < 120 &&
vType->hasFloatingRepresentation())
return InvalidOperands(Loc, LHS, RHS);
// FIXME: The check for C++ here is for GCC compatibility. GCC rejects the
// usage of the logical operators && and || with vectors in C. This
// check could be notionally dropped.
if (!getLangOpts().CPlusPlus &&
!(isa<ExtVectorType>(vType->getAs<VectorType>())))
return InvalidLogicalVectorOperands(Loc, LHS, RHS);
return GetSignedVectorType(LHS.get()->getType());
}
QualType Sema::CheckMatrixElementwiseOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
bool IsCompAssign) {
if (!IsCompAssign) {
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
}
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
// For conversion purposes, we ignore any qualifiers.
// For example, "const float" and "float" are equivalent.
QualType LHSType = LHS.get()->getType().getUnqualifiedType();
QualType RHSType = RHS.get()->getType().getUnqualifiedType();
const MatrixType *LHSMatType = LHSType->getAs<MatrixType>();
const MatrixType *RHSMatType = RHSType->getAs<MatrixType>();
assert((LHSMatType || RHSMatType) && "At least one operand must be a matrix");
if (Context.hasSameType(LHSType, RHSType))
return Context.getCommonSugaredType(LHSType, RHSType);
// Type conversion may change LHS/RHS. Keep copies to the original results, in
// case we have to return InvalidOperands.
ExprResult OriginalLHS = LHS;
ExprResult OriginalRHS = RHS;
if (LHSMatType && !RHSMatType) {
RHS = tryConvertExprToType(RHS.get(), LHSMatType->getElementType());
if (!RHS.isInvalid())
return LHSType;
return InvalidOperands(Loc, OriginalLHS, OriginalRHS);
}
if (!LHSMatType && RHSMatType) {
LHS = tryConvertExprToType(LHS.get(), RHSMatType->getElementType());
if (!LHS.isInvalid())
return RHSType;
return InvalidOperands(Loc, OriginalLHS, OriginalRHS);
}
return InvalidOperands(Loc, LHS, RHS);
}
QualType Sema::CheckMatrixMultiplyOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
bool IsCompAssign) {
if (!IsCompAssign) {
LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
if (LHS.isInvalid())
return QualType();
}
RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
auto *LHSMatType = LHS.get()->getType()->getAs<ConstantMatrixType>();
auto *RHSMatType = RHS.get()->getType()->getAs<ConstantMatrixType>();
assert((LHSMatType || RHSMatType) && "At least one operand must be a matrix");
if (LHSMatType && RHSMatType) {
if (LHSMatType->getNumColumns() != RHSMatType->getNumRows())
return InvalidOperands(Loc, LHS, RHS);
if (Context.hasSameType(LHSMatType, RHSMatType))
return Context.getCommonSugaredType(
LHS.get()->getType().getUnqualifiedType(),
RHS.get()->getType().getUnqualifiedType());
QualType LHSELTy = LHSMatType->getElementType(),
RHSELTy = RHSMatType->getElementType();
if (!Context.hasSameType(LHSELTy, RHSELTy))
return InvalidOperands(Loc, LHS, RHS);
return Context.getConstantMatrixType(
Context.getCommonSugaredType(LHSELTy, RHSELTy),
LHSMatType->getNumRows(), RHSMatType->getNumColumns());
}
return CheckMatrixElementwiseOperands(LHS, RHS, Loc, IsCompAssign);
}
static bool isLegalBoolVectorBinaryOp(BinaryOperatorKind Opc) {
switch (Opc) {
default:
return false;
case BO_And:
case BO_AndAssign:
case BO_Or:
case BO_OrAssign:
case BO_Xor:
case BO_XorAssign:
return true;
}
}
inline QualType Sema::CheckBitwiseOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
BinaryOperatorKind Opc) {
checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
bool IsCompAssign =
Opc == BO_AndAssign || Opc == BO_OrAssign || Opc == BO_XorAssign;
bool LegalBoolVecOperator = isLegalBoolVectorBinaryOp(Opc);
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType()) {
if (LHS.get()->getType()->hasIntegerRepresentation() &&
RHS.get()->getType()->hasIntegerRepresentation())
return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
/*AllowBothBool*/ true,
/*AllowBoolConversions*/ getLangOpts().ZVector,
/*AllowBooleanOperation*/ LegalBoolVecOperator,
/*ReportInvalid*/ true);
return InvalidOperands(Loc, LHS, RHS);
}
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType()) {
if (LHS.get()->getType()->hasIntegerRepresentation() &&
RHS.get()->getType()->hasIntegerRepresentation())
return CheckSizelessVectorOperands(LHS, RHS, Loc, IsCompAssign,
ACK_BitwiseOp);
return InvalidOperands(Loc, LHS, RHS);
}
if (LHS.get()->getType()->isSveVLSBuiltinType() ||
RHS.get()->getType()->isSveVLSBuiltinType()) {
if (LHS.get()->getType()->hasIntegerRepresentation() &&
RHS.get()->getType()->hasIntegerRepresentation())
return CheckSizelessVectorOperands(LHS, RHS, Loc, IsCompAssign,
ACK_BitwiseOp);
return InvalidOperands(Loc, LHS, RHS);
}
if (Opc == BO_And)
diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
if (LHS.get()->getType()->hasFloatingRepresentation() ||
RHS.get()->getType()->hasFloatingRepresentation())
return InvalidOperands(Loc, LHS, RHS);
ExprResult LHSResult = LHS, RHSResult = RHS;
QualType compType = UsualArithmeticConversions(
LHSResult, RHSResult, Loc, IsCompAssign ? ACK_CompAssign : ACK_BitwiseOp);
if (LHSResult.isInvalid() || RHSResult.isInvalid())
return QualType();
LHS = LHSResult.get();
RHS = RHSResult.get();
if (Opc == BO_Xor)
diagnoseXorMisusedAsPow(*this, LHS, RHS, Loc);
if (!compType.isNull() && compType->isIntegralOrUnscopedEnumerationType())
return compType;
return InvalidOperands(Loc, LHS, RHS);
}
// C99 6.5.[13,14]
inline QualType Sema::CheckLogicalOperands(ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc,
BinaryOperatorKind Opc) {
// Check vector operands differently.
if (LHS.get()->getType()->isVectorType() ||
RHS.get()->getType()->isVectorType())
return CheckVectorLogicalOperands(LHS, RHS, Loc);
bool EnumConstantInBoolContext = false;
for (const ExprResult &HS : {LHS, RHS}) {
if (const auto *DREHS = dyn_cast<DeclRefExpr>(HS.get())) {
const auto *ECDHS = dyn_cast<EnumConstantDecl>(DREHS->getDecl());
if (ECDHS && ECDHS->getInitVal() != 0 && ECDHS->getInitVal() != 1)
EnumConstantInBoolContext = true;
}
}
if (EnumConstantInBoolContext)
Diag(Loc, diag::warn_enum_constant_in_bool_context);
// WebAssembly tables can't be used with logical operators.
QualType LHSTy = LHS.get()->getType();
QualType RHSTy = RHS.get()->getType();
const auto *LHSATy = dyn_cast<ArrayType>(LHSTy);
const auto *RHSATy = dyn_cast<ArrayType>(RHSTy);
if ((LHSATy && LHSATy->getElementType().isWebAssemblyReferenceType()) ||
(RHSATy && RHSATy->getElementType().isWebAssemblyReferenceType())) {
return InvalidOperands(Loc, LHS, RHS);
}
// Diagnose cases where the user write a logical and/or but probably meant a
// bitwise one. We do this when the LHS is a non-bool integer and the RHS
// is a constant.
if (!EnumConstantInBoolContext && LHS.get()->getType()->isIntegerType() &&
!LHS.get()->getType()->isBooleanType() &&
RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
// Don't warn in macros or template instantiations.
!Loc.isMacroID() && !inTemplateInstantiation()) {
// If the RHS can be constant folded, and if it constant folds to something
// that isn't 0 or 1 (which indicate a potential logical operation that
// happened to fold to true/false) then warn.
// Parens on the RHS are ignored.
Expr::EvalResult EVResult;
if (RHS.get()->EvaluateAsInt(EVResult, Context)) {
llvm::APSInt Result = EVResult.Val.getInt();
if ((getLangOpts().CPlusPlus && !RHS.get()->getType()->isBooleanType() &&
!RHS.get()->getExprLoc().isMacroID()) ||
(Result != 0 && Result != 1)) {
Diag(Loc, diag::warn_logical_instead_of_bitwise)
<< RHS.get()->getSourceRange() << (Opc == BO_LAnd ? "&&" : "||");
// Suggest replacing the logical operator with the bitwise version
Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
<< (Opc == BO_LAnd ? "&" : "|")
<< FixItHint::CreateReplacement(
SourceRange(Loc, getLocForEndOfToken(Loc)),
Opc == BO_LAnd ? "&" : "|");
if (Opc == BO_LAnd)
// Suggest replacing "Foo() && kNonZero" with "Foo()"
Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
<< FixItHint::CreateRemoval(
SourceRange(getLocForEndOfToken(LHS.get()->getEndLoc()),
RHS.get()->getEndLoc()));
}
}
}
if (!Context.getLangOpts().CPlusPlus) {
// OpenCL v1.1 s6.3.g: The logical operators and (&&), or (||) do
// not operate on the built-in scalar and vector float types.
if (Context.getLangOpts().OpenCL &&
Context.getLangOpts().OpenCLVersion < 120) {
if (LHS.get()->getType()->isFloatingType() ||
RHS.get()->getType()->isFloatingType())
return InvalidOperands(Loc, LHS, RHS);
}
LHS = UsualUnaryConversions(LHS.get());
if (LHS.isInvalid())
return QualType();
RHS = UsualUnaryConversions(RHS.get());
if (RHS.isInvalid())
return QualType();
if (!LHS.get()->getType()->isScalarType() ||
!RHS.get()->getType()->isScalarType())
return InvalidOperands(Loc, LHS, RHS);
return Context.IntTy;
}
// The following is safe because we only use this method for
// non-overloadable operands.
// C++ [expr.log.and]p1
// C++ [expr.log.or]p1
// The operands are both contextually converted to type bool.
ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
if (LHSRes.isInvalid())
return InvalidOperands(Loc, LHS, RHS);
LHS = LHSRes;
ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
if (RHSRes.isInvalid())
return InvalidOperands(Loc, LHS, RHS);
RHS = RHSRes;
// C++ [expr.log.and]p2
// C++ [expr.log.or]p2
// The result is a bool.
return Context.BoolTy;
}
static bool IsReadonlyMessage(Expr *E, Sema &S) {
const MemberExpr *ME = dyn_cast<MemberExpr>(E);
if (!ME) return false;
if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
ObjCMessageExpr *Base = dyn_cast<ObjCMessageExpr>(
ME->getBase()->IgnoreImplicit()->IgnoreParenImpCasts());
if (!Base) return false;
return Base->getMethodDecl() != nullptr;
}
/// Is the given expression (which must be 'const') a reference to a
/// variable which was originally non-const, but which has become
/// 'const' due to being captured within a block?
enum NonConstCaptureKind { NCCK_None, NCCK_Block, NCCK_Lambda };
static NonConstCaptureKind isReferenceToNonConstCapture(Sema &S, Expr *E) {
assert(E->isLValue() && E->getType().isConstQualified());
E = E->IgnoreParens();
// Must be a reference to a declaration from an enclosing scope.
DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
if (!DRE) return NCCK_None;
if (!DRE->refersToEnclosingVariableOrCapture()) return NCCK_None;
// The declaration must be a variable which is not declared 'const'.
VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl());
if (!var) return NCCK_None;
if (var->getType().isConstQualified()) return NCCK_None;
assert(var->hasLocalStorage() && "capture added 'const' to non-local?");
// Decide whether the first capture was for a block or a lambda.
DeclContext *DC = S.CurContext, *Prev = nullptr;
// Decide whether the first capture was for a block or a lambda.
while (DC) {
// For init-capture, it is possible that the variable belongs to the
// template pattern of the current context.
if (auto *FD = dyn_cast<FunctionDecl>(DC))
if (var->isInitCapture() &&
FD->getTemplateInstantiationPattern() == var->getDeclContext())
break;
if (DC == var->getDeclContext())
break;
Prev = DC;
DC = DC->getParent();
}
// Unless we have an init-capture, we've gone one step too far.
if (!var->isInitCapture())
DC = Prev;
return (isa<BlockDecl>(DC) ? NCCK_Block : NCCK_Lambda);
}
static bool IsTypeModifiable(QualType Ty, bool IsDereference) {
Ty = Ty.getNonReferenceType();
if (IsDereference && Ty->isPointerType())
Ty = Ty->getPointeeType();
return !Ty.isConstQualified();
}
// Update err_typecheck_assign_const and note_typecheck_assign_const
// when this enum is changed.
enum {
ConstFunction,
ConstVariable,
ConstMember,
ConstMethod,
NestedConstMember,
ConstUnknown, // Keep as last element
};
/// Emit the "read-only variable not assignable" error and print notes to give
/// more information about why the variable is not assignable, such as pointing
/// to the declaration of a const variable, showing that a method is const, or
/// that the function is returning a const reference.
static void DiagnoseConstAssignment(Sema &S, const Expr *E,
SourceLocation Loc) {
SourceRange ExprRange = E->getSourceRange();
// Only emit one error on the first const found. All other consts will emit
// a note to the error.
bool DiagnosticEmitted = false;
// Track if the current expression is the result of a dereference, and if the
// next checked expression is the result of a dereference.
bool IsDereference = false;
bool NextIsDereference = false;
// Loop to process MemberExpr chains.
while (true) {
IsDereference = NextIsDereference;
E = E->IgnoreImplicit()->IgnoreParenImpCasts();
if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
NextIsDereference = ME->isArrow();
const ValueDecl *VD = ME->getMemberDecl();
if (const FieldDecl *Field = dyn_cast<FieldDecl>(VD)) {
// Mutable fields can be modified even if the class is const.
if (Field->isMutable()) {
assert(DiagnosticEmitted && "Expected diagnostic not emitted.");
break;
}
if (!IsTypeModifiable(Field->getType(), IsDereference)) {
if (!DiagnosticEmitted) {
S.Diag(Loc, diag::err_typecheck_assign_const)
<< ExprRange << ConstMember << false /*static*/ << Field
<< Field->getType();
DiagnosticEmitted = true;
}
S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
<< ConstMember << false /*static*/ << Field << Field->getType()
<< Field->getSourceRange();
}
E = ME->getBase();
continue;
} else if (const VarDecl *VDecl = dyn_cast<VarDecl>(VD)) {
if (VDecl->getType().isConstQualified()) {
if (!DiagnosticEmitted) {
S.Diag(Loc, diag::err_typecheck_assign_const)
<< ExprRange << ConstMember << true /*static*/ << VDecl
<< VDecl->getType();
DiagnosticEmitted = true;
}
S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
<< ConstMember << true /*static*/ << VDecl << VDecl->getType()
<< VDecl->getSourceRange();
}
// Static fields do not inherit constness from parents.
break;
}
break; // End MemberExpr
} else if (const ArraySubscriptExpr *ASE =
dyn_cast<ArraySubscriptExpr>(E)) {
E = ASE->getBase()->IgnoreParenImpCasts();
continue;
} else if (const ExtVectorElementExpr *EVE =
dyn_cast<ExtVectorElementExpr>(E)) {
E = EVE->getBase()->IgnoreParenImpCasts();
continue;
}
break;
}
if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
// Function calls
const FunctionDecl *FD = CE->getDirectCallee();
if (FD && !IsTypeModifiable(FD->getReturnType(), IsDereference)) {
if (!DiagnosticEmitted) {
S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
<< ConstFunction << FD;
DiagnosticEmitted = true;
}
S.Diag(FD->getReturnTypeSourceRange().getBegin(),
diag::note_typecheck_assign_const)
<< ConstFunction << FD << FD->getReturnType()
<< FD->getReturnTypeSourceRange();
}
} else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
// Point to variable declaration.
if (const ValueDecl *VD = DRE->getDecl()) {
if (!IsTypeModifiable(VD->getType(), IsDereference)) {
if (!DiagnosticEmitted) {
S.Diag(Loc, diag::err_typecheck_assign_const)
<< ExprRange << ConstVariable << VD << VD->getType();
DiagnosticEmitted = true;
}
S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
<< ConstVariable << VD << VD->getType() << VD->getSourceRange();
}
}
} else if (isa<CXXThisExpr>(E)) {
if (const DeclContext *DC = S.getFunctionLevelDeclContext()) {
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) {
if (MD->isConst()) {
if (!DiagnosticEmitted) {
S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
<< ConstMethod << MD;
DiagnosticEmitted = true;
}
S.Diag(MD->getLocation(), diag::note_typecheck_assign_const)
<< ConstMethod << MD << MD->getSourceRange();
}
}
}
}
if (DiagnosticEmitted)
return;
// Can't determine a more specific message, so display the generic error.
S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange << ConstUnknown;
}
enum OriginalExprKind {
OEK_Variable,
OEK_Member,
OEK_LValue
};
static void DiagnoseRecursiveConstFields(Sema &S, const ValueDecl *VD,
const RecordType *Ty,
SourceLocation Loc, SourceRange Range,
OriginalExprKind OEK,
bool &DiagnosticEmitted) {
std::vector<const RecordType *> RecordTypeList;
RecordTypeList.push_back(Ty);
unsigned NextToCheckIndex = 0;
// We walk the record hierarchy breadth-first to ensure that we print
// diagnostics in field nesting order.
while (RecordTypeList.size() > NextToCheckIndex) {
bool IsNested = NextToCheckIndex > 0;
for (const FieldDecl *Field :
RecordTypeList[NextToCheckIndex]->getDecl()->fields()) {
// First, check every field for constness.
QualType FieldTy = Field->getType();
if (FieldTy.isConstQualified()) {
if (!DiagnosticEmitted) {
S.Diag(Loc, diag::err_typecheck_assign_const)
<< Range << NestedConstMember << OEK << VD
<< IsNested << Field;
DiagnosticEmitted = true;
}
S.Diag(Field->getLocation(), diag::note_typecheck_assign_const)
<< NestedConstMember << IsNested << Field
<< FieldTy << Field->getSourceRange();
}
// Then we append it to the list to check next in order.
FieldTy = FieldTy.getCanonicalType();
if (const auto *FieldRecTy = FieldTy->getAs<RecordType>()) {
if (!llvm::is_contained(RecordTypeList, FieldRecTy))
RecordTypeList.push_back(FieldRecTy);
}
}
++NextToCheckIndex;
}
}
/// Emit an error for the case where a record we are trying to assign to has a
/// const-qualified field somewhere in its hierarchy.
static void DiagnoseRecursiveConstFields(Sema &S, const Expr *E,
SourceLocation Loc) {
QualType Ty = E->getType();
assert(Ty->isRecordType() && "lvalue was not record?");
SourceRange Range = E->getSourceRange();
const RecordType *RTy = Ty.getCanonicalType()->getAs<RecordType>();
bool DiagEmitted = false;
if (const MemberExpr *ME = dyn_cast<MemberExpr>(E))
DiagnoseRecursiveConstFields(S, ME->getMemberDecl(), RTy, Loc,
Range, OEK_Member, DiagEmitted);
else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
DiagnoseRecursiveConstFields(S, DRE->getDecl(), RTy, Loc,
Range, OEK_Variable, DiagEmitted);
else
DiagnoseRecursiveConstFields(S, nullptr, RTy, Loc,
Range, OEK_LValue, DiagEmitted);
if (!DiagEmitted)
DiagnoseConstAssignment(S, E, Loc);
}
/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
/// emit an error and return true. If so, return false.
static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
assert(!E->hasPlaceholderType(BuiltinType::PseudoObject));
S.CheckShadowingDeclModification(E, Loc);
SourceLocation OrigLoc = Loc;
Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
&Loc);
if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
IsLV = Expr::MLV_InvalidMessageExpression;
if (IsLV == Expr::MLV_Valid)
return false;
unsigned DiagID = 0;
bool NeedType = false;
switch (IsLV) { // C99 6.5.16p2
case Expr::MLV_ConstQualified:
// Use a specialized diagnostic when we're assigning to an object
// from an enclosing function or block.
if (NonConstCaptureKind NCCK = isReferenceToNonConstCapture(S, E)) {
if (NCCK == NCCK_Block)
DiagID = diag::err_block_decl_ref_not_modifiable_lvalue;
else
DiagID = diag::err_lambda_decl_ref_not_modifiable_lvalue;
break;
}
// In ARC, use some specialized diagnostics for occasions where we
// infer 'const'. These are always pseudo-strong variables.
if (S.getLangOpts().ObjCAutoRefCount) {
DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
if (declRef && isa<VarDecl>(declRef->getDecl())) {
VarDecl *var = cast<VarDecl>(declRef->getDecl());
// Use the normal diagnostic if it's pseudo-__strong but the
// user actually wrote 'const'.
if (var->isARCPseudoStrong() &&
(!var->getTypeSourceInfo() ||
!var->getTypeSourceInfo()->getType().isConstQualified())) {
// There are three pseudo-strong cases:
// - self
ObjCMethodDecl *method = S.getCurMethodDecl();
if (method && var == method->getSelfDecl()) {
DiagID = method->isClassMethod()
? diag::err_typecheck_arc_assign_self_class_method
: diag::err_typecheck_arc_assign_self;
// - Objective-C externally_retained attribute.
} else if (var->hasAttr<ObjCExternallyRetainedAttr>() ||
isa<ParmVarDecl>(var)) {
DiagID = diag::err_typecheck_arc_assign_externally_retained;
// - fast enumeration variables
} else {
DiagID = diag::err_typecheck_arr_assign_enumeration;
}
SourceRange Assign;
if (Loc != OrigLoc)
Assign = SourceRange(OrigLoc, OrigLoc);
S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
// We need to preserve the AST regardless, so migration tool
// can do its job.
return false;
}
}
}
// If none of the special cases above are triggered, then this is a
// simple const assignment.
if (DiagID == 0) {
DiagnoseConstAssignment(S, E, Loc);
return true;
}
break;
case Expr::MLV_ConstAddrSpace:
DiagnoseConstAssignment(S, E, Loc);
return true;
case Expr::MLV_ConstQualifiedField:
DiagnoseRecursiveConstFields(S, E, Loc);
return true;
case Expr::MLV_ArrayType:
case Expr::MLV_ArrayTemporary:
DiagID = diag::err_typecheck_array_not_modifiable_lvalue;
NeedType = true;
break;
case Expr::MLV_NotObjectType:
DiagID = diag::err_typecheck_non_object_not_modifiable_lvalue;
NeedType = true;
break;
case Expr::MLV_LValueCast:
DiagID = diag::err_typecheck_lvalue_casts_not_supported;
break;
case Expr::MLV_Valid:
llvm_unreachable("did not take early return for MLV_Valid");
case Expr::MLV_InvalidExpression:
case Expr::MLV_MemberFunction:
case Expr::MLV_ClassTemporary:
DiagID = diag::err_typecheck_expression_not_modifiable_lvalue;
break;
case Expr::MLV_IncompleteType:
case Expr::MLV_IncompleteVoidType:
return S.RequireCompleteType(Loc, E->getType(),
diag::err_typecheck_incomplete_type_not_modifiable_lvalue, E);
case Expr::MLV_DuplicateVectorComponents:
DiagID = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
break;
case Expr::MLV_NoSetterProperty:
llvm_unreachable("readonly properties should be processed differently");
case Expr::MLV_InvalidMessageExpression:
DiagID = diag::err_readonly_message_assignment;
break;
case Expr::MLV_SubObjCPropertySetting:
DiagID = diag::err_no_subobject_property_setting;
break;
}
SourceRange Assign;
if (Loc != OrigLoc)
Assign = SourceRange(OrigLoc, OrigLoc);
if (NeedType)
S.Diag(Loc, DiagID) << E->getType() << E->getSourceRange() << Assign;
else
S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
return true;
}
static void CheckIdentityFieldAssignment(Expr *LHSExpr, Expr *RHSExpr,
SourceLocation Loc,
Sema &Sema) {
if (Sema.inTemplateInstantiation())
return;
if (Sema.isUnevaluatedContext())
return;
if (Loc.isInvalid() || Loc.isMacroID())
return;
if (LHSExpr->getExprLoc().isMacroID() || RHSExpr->getExprLoc().isMacroID())
return;
// C / C++ fields
MemberExpr *ML = dyn_cast<MemberExpr>(LHSExpr);
MemberExpr *MR = dyn_cast<MemberExpr>(RHSExpr);
if (ML && MR) {
if (!(isa<CXXThisExpr>(ML->getBase()) && isa<CXXThisExpr>(MR->getBase())))
return;
const ValueDecl *LHSDecl =
cast<ValueDecl>(ML->getMemberDecl()->getCanonicalDecl());
const ValueDecl *RHSDecl =
cast<ValueDecl>(MR->getMemberDecl()->getCanonicalDecl());
if (LHSDecl != RHSDecl)
return;
if (LHSDecl->getType().isVolatileQualified())
return;
if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
if (RefTy->getPointeeType().isVolatileQualified())
return;
Sema.Diag(Loc, diag::warn_identity_field_assign) << 0;
}
// Objective-C instance variables
ObjCIvarRefExpr *OL = dyn_cast<ObjCIvarRefExpr>(LHSExpr);
ObjCIvarRefExpr *OR = dyn_cast<ObjCIvarRefExpr>(RHSExpr);
if (OL && OR && OL->getDecl() == OR->getDecl()) {
DeclRefExpr *RL = dyn_cast<DeclRefExpr>(OL->getBase()->IgnoreImpCasts());
DeclRefExpr *RR = dyn_cast<DeclRefExpr>(OR->getBase()->IgnoreImpCasts());
if (RL && RR && RL->getDecl() == RR->getDecl())
Sema.Diag(Loc, diag::warn_identity_field_assign) << 1;
}
}
// C99 6.5.16.1
QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
SourceLocation Loc,
QualType CompoundType,
BinaryOperatorKind Opc) {
assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject));
// Verify that LHS is a modifiable lvalue, and emit error if not.
if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
return QualType();
QualType LHSType = LHSExpr->getType();
QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
CompoundType;
// OpenCL v1.2 s6.1.1.1 p2:
// The half data type can only be used to declare a pointer to a buffer that
// contains half values
if (getLangOpts().OpenCL &&
!getOpenCLOptions().isAvailableOption("cl_khr_fp16", getLangOpts()) &&
LHSType->isHalfType()) {
Diag(Loc, diag::err_opencl_half_load_store) << 1
<< LHSType.getUnqualifiedType();
return QualType();
}
// WebAssembly tables can't be used on RHS of an assignment expression.
if (RHSType->isWebAssemblyTableType()) {
Diag(Loc, diag::err_wasm_table_art) << 0;
return QualType();
}
AssignConvertType ConvTy;
if (CompoundType.isNull()) {
Expr *RHSCheck = RHS.get();
CheckIdentityFieldAssignment(LHSExpr, RHSCheck, Loc, *this);
QualType LHSTy(LHSType);
ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
if (RHS.isInvalid())
return QualType();
// Special case of NSObject attributes on c-style pointer types.
if (ConvTy == IncompatiblePointer &&
((Context.isObjCNSObjectType(LHSType) &&
RHSType->isObjCObjectPointerType()) ||
(Context.isObjCNSObjectType(RHSType) &&
LHSType->isObjCObjectPointerType())))
ConvTy = Compatible;
if (ConvTy == Compatible &&
LHSType->isObjCObjectType())
Diag(Loc, diag::err_objc_object_assignment)
<< LHSType;
// If the RHS is a unary plus or minus, check to see if they = and + are
// right next to each other. If so, the user may have typo'd "x =+ 4"
// instead of "x += 4".
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
RHSCheck = ICE->getSubExpr();
if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
if ((UO->getOpcode() == UO_Plus || UO->getOpcode() == UO_Minus) &&
Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
// Only if the two operators are exactly adjacent.
Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
// And there is a space or other character before the subexpr of the
// unary +/-. We don't want to warn on "x=-1".
Loc.getLocWithOffset(2) != UO->getSubExpr()->getBeginLoc() &&
UO->getSubExpr()->getBeginLoc().isFileID()) {
Diag(Loc, diag::warn_not_compound_assign)
<< (UO->getOpcode() == UO_Plus ? "+" : "-")
<< SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
}
}
if (ConvTy == Compatible) {
if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong) {
// Warn about retain cycles where a block captures the LHS, but
// not if the LHS is a simple variable into which the block is
// being stored...unless that variable can be captured by reference!
const Expr *InnerLHS = LHSExpr->IgnoreParenCasts();
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InnerLHS);
if (!DRE || DRE->getDecl()->hasAttr<BlocksAttr>())
checkRetainCycles(LHSExpr, RHS.get());
}
if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong ||
LHSType.isNonWeakInMRRWithObjCWeak(Context)) {
// It is safe to assign a weak reference into a strong variable.
// Although this code can still have problems:
// id x = self.weakProp;
// id y = self.weakProp;
// we do not warn to warn spuriously when 'x' and 'y' are on separate
// paths through the function. This should be revisited if
// -Wrepeated-use-of-weak is made flow-sensitive.
// For ObjCWeak only, we do not warn if the assign is to a non-weak
// variable, which will be valid for the current autorelease scope.
if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
RHS.get()->getBeginLoc()))
getCurFunction()->markSafeWeakUse(RHS.get());
} else if (getLangOpts().ObjCAutoRefCount || getLangOpts().ObjCWeak) {
checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
}
}
} else {
// Compound assignment "x += y"
ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
}
if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
RHS.get(), AA_Assigning))
return QualType();
CheckForNullPointerDereference(*this, LHSExpr);
if (getLangOpts().CPlusPlus20 && LHSType.isVolatileQualified()) {
if (CompoundType.isNull()) {
// C++2a [expr.ass]p5:
// A simple-assignment whose left operand is of a volatile-qualified
// type is deprecated unless the assignment is either a discarded-value
// expression or an unevaluated operand
ExprEvalContexts.back().VolatileAssignmentLHSs.push_back(LHSExpr);
}
}
// C11 6.5.16p3: The type of an assignment expression is the type of the
// left operand would have after lvalue conversion.
// C11 6.3.2.1p2: ...this is called lvalue conversion. If the lvalue has
// qualified type, the value has the unqualified version of the type of the
// lvalue; additionally, if the lvalue has atomic type, the value has the
// non-atomic version of the type of the lvalue.
// C++ 5.17p1: the type of the assignment expression is that of its left
// operand.
return getLangOpts().CPlusPlus ? LHSType : LHSType.getAtomicUnqualifiedType();
}
// Scenarios to ignore if expression E is:
// 1. an explicit cast expression into void
// 2. a function call expression that returns void
static bool IgnoreCommaOperand(const Expr *E, const ASTContext &Context) {
E = E->IgnoreParens();
if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
if (CE->getCastKind() == CK_ToVoid) {
return true;
}
// static_cast<void> on a dependent type will not show up as CK_ToVoid.
if (CE->getCastKind() == CK_Dependent && E->getType()->isVoidType() &&
CE->getSubExpr()->getType()->isDependentType()) {
return true;
}
}
if (const auto *CE = dyn_cast<CallExpr>(E))
return CE->getCallReturnType(Context)->isVoidType();
return false;
}
// Look for instances where it is likely the comma operator is confused with
// another operator. There is an explicit list of acceptable expressions for
// the left hand side of the comma operator, otherwise emit a warning.
void Sema::DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc) {
// No warnings in macros
if (Loc.isMacroID())
return;
// Don't warn in template instantiations.
if (inTemplateInstantiation())
return;
// Scope isn't fine-grained enough to explicitly list the specific cases, so
// instead, skip more than needed, then call back into here with the
// CommaVisitor in SemaStmt.cpp.
// The listed locations are the initialization and increment portions
// of a for loop. The additional checks are on the condition of
// if statements, do/while loops, and for loops.
// Differences in scope flags for C89 mode requires the extra logic.
const unsigned ForIncrementFlags =
getLangOpts().C99 || getLangOpts().CPlusPlus
? Scope::ControlScope | Scope::ContinueScope | Scope::BreakScope
: Scope::ContinueScope | Scope::BreakScope;
const unsigned ForInitFlags = Scope::ControlScope | Scope::DeclScope;
const unsigned ScopeFlags = getCurScope()->getFlags();
if ((ScopeFlags & ForIncrementFlags) == ForIncrementFlags ||
(ScopeFlags & ForInitFlags) == ForInitFlags)
return;
// If there are multiple comma operators used together, get the RHS of the
// of the comma operator as the LHS.
while (const BinaryOperator *BO = dyn_cast<BinaryOperator>(LHS)) {
if (BO->getOpcode() != BO_Comma)
break;
LHS = BO->getRHS();
}
// Only allow some expressions on LHS to not warn.
if (IgnoreCommaOperand(LHS, Context))
return;
Diag(Loc, diag::warn_comma_operator);
Diag(LHS->getBeginLoc(), diag::note_cast_to_void)
<< LHS->getSourceRange()
<< FixItHint::CreateInsertion(LHS->getBeginLoc(),
LangOpts.CPlusPlus ? "static_cast<void>("
: "(void)(")
<< FixItHint::CreateInsertion(PP.getLocForEndOfToken(LHS->getEndLoc()),
")");
}
// C99 6.5.17
static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
SourceLocation Loc) {
LHS = S.CheckPlaceholderExpr(LHS.get());
RHS = S.CheckPlaceholderExpr(RHS.get());
if (LHS.isInvalid() || RHS.isInvalid())
return QualType();
// C's comma performs lvalue conversion (C99 6.3.2.1) on both its
// operands, but not unary promotions.
// C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
// So we treat the LHS as a ignored value, and in C++ we allow the
// containing site to determine what should be done with the RHS.
LHS = S.IgnoredValueConversions(LHS.get());
if (LHS.isInvalid())
return QualType();
S.DiagnoseUnusedExprResult(LHS.get(), diag::warn_unused_comma_left_operand);
if (!S.getLangOpts().CPlusPlus) {
RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
if (RHS.isInvalid())
return QualType();
if (!RHS.get()->getType()->isVoidType())
S.RequireCompleteType(Loc, RHS.get()->getType(),
diag::err_incomplete_type);
}
if (!S.getDiagnostics().isIgnored(diag::warn_comma_operator, Loc))
S.DiagnoseCommaOperator(LHS.get(), Loc);
return RHS.get()->getType();
}
/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
ExprValueKind &VK,
ExprObjectKind &OK,
SourceLocation OpLoc,
bool IsInc, bool IsPrefix) {
if (Op->isTypeDependent())
return S.Context.DependentTy;
QualType ResType = Op->getType();
// Atomic types can be used for increment / decrement where the non-atomic
// versions can, so ignore the _Atomic() specifier for the purpose of
// checking.
if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
ResType = ResAtomicType->getValueType();
assert(!ResType.isNull() && "no type for increment/decrement expression");
if (S.getLangOpts().CPlusPlus && ResType->isBooleanType()) {
// Decrement of bool is not allowed.
if (!IsInc) {
S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
return QualType();
}
// Increment of bool sets it to true, but is deprecated.
S.Diag(OpLoc, S.getLangOpts().CPlusPlus17 ? diag::ext_increment_bool
: diag::warn_increment_bool)
<< Op->getSourceRange();
} else if (S.getLangOpts().CPlusPlus && ResType->isEnumeralType()) {
// Error on enum increments and decrements in C++ mode
S.Diag(OpLoc, diag::err_increment_decrement_enum) << IsInc << ResType;
return QualType();
} else if (ResType->isRealType()) {
// OK!
} else if (ResType->isPointerType()) {
// C99 6.5.2.4p2, 6.5.6p2
if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
return QualType();
} else if (ResType->isObjCObjectPointerType()) {
// On modern runtimes, ObjC pointer arithmetic is forbidden.
// Otherwise, we just need a complete type.
if (checkArithmeticIncompletePointerType(S, OpLoc, Op) ||
checkArithmeticOnObjCPointer(S, OpLoc, Op))
return QualType();
} else if (ResType->isAnyComplexType()) {
// C99 does not support ++/-- on complex types, we allow as an extension.
S.Diag(OpLoc, diag::ext_integer_increment_complex)
<< ResType << Op->getSourceRange();
} else if (ResType->isPlaceholderType()) {
ExprResult PR = S.CheckPlaceholderExpr(Op);
if (PR.isInvalid()) return QualType();
return CheckIncrementDecrementOperand(S, PR.get(), VK, OK, OpLoc,
IsInc, IsPrefix);
} else if (S.getLangOpts().AltiVec && ResType->isVectorType()) {
// OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
} else if (S.getLangOpts().ZVector && ResType->isVectorType() &&
(ResType->castAs<VectorType>()->getVectorKind() !=
VectorKind::AltiVecBool)) {
// The z vector extensions allow ++ and -- for non-bool vectors.
} else if (S.getLangOpts().OpenCL && ResType->isVectorType() &&
ResType->castAs<VectorType>()->getElementType()->isIntegerType()) {
// OpenCL V1.2 6.3 says dec/inc ops operate on integer vector types.
} else {
S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
<< ResType << int(IsInc) << Op->getSourceRange();
return QualType();
}
// At this point, we know we have a real, complex or pointer type.
// Now make sure the operand is a modifiable lvalue.
if (CheckForModifiableLvalue(Op, OpLoc, S))
return QualType();
if (S.getLangOpts().CPlusPlus20 && ResType.isVolatileQualified()) {
// C++2a [expr.pre.inc]p1, [expr.post.inc]p1:
// An operand with volatile-qualified type is deprecated
S.Diag(OpLoc, diag::warn_deprecated_increment_decrement_volatile)
<< IsInc << ResType;
}
// In C++, a prefix increment is the same type as the operand. Otherwise
// (in C or with postfix), the increment is the unqualified type of the
// operand.
if (IsPrefix && S.getLangOpts().CPlusPlus) {
VK = VK_LValue;
OK = Op->getObjectKind();
return ResType;
} else {
VK = VK_PRValue;
return ResType.getUnqualifiedType();
}
}
/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
/// This routine allows us to typecheck complex/recursive expressions
/// where the declaration is needed for type checking. We only need to
/// handle cases when the expression references a function designator
/// or is an lvalue. Here are some examples:
/// - &(x) => x
/// - &*****f => f for f a function designator.
/// - &s.xx => s
/// - &s.zz[1].yy -> s, if zz is an array
/// - *(x + 1) -> x, if x is an array
/// - &"123"[2] -> 0
/// - & __real__ x -> x
///
/// FIXME: We don't recurse to the RHS of a comma, nor handle pointers to
/// members.
static ValueDecl *getPrimaryDecl(Expr *E) {
switch (E->getStmtClass()) {
case Stmt::DeclRefExprClass:
return cast<DeclRefExpr>(E)->getDecl();
case Stmt::MemberExprClass:
// If this is an arrow operator, the address is an offset from
// the base's value, so the object the base refers to is
// irrelevant.
if (cast<MemberExpr>(E)->isArrow())
return nullptr;
// Otherwise, the expression refers to a part of the base
return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
case Stmt::ArraySubscriptExprClass: {
// FIXME: This code shouldn't be necessary! We should catch the implicit
// promotion of register arrays earlier.
Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
if (ICE->getSubExpr()->getType()->isArrayType())
return getPrimaryDecl(ICE->getSubExpr());
}
return nullptr;
}
case Stmt::UnaryOperatorClass: {
UnaryOperator *UO = cast<UnaryOperator>(E);
switch(UO->getOpcode()) {
case UO_Real:
case UO_Imag:
case UO_Extension:
return getPrimaryDecl(UO->getSubExpr());
default:
return nullptr;
}
}
case Stmt::ParenExprClass:
return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
case Stmt::ImplicitCastExprClass:
// If the result of an implicit cast is an l-value, we care about
// the sub-expression; otherwise, the result here doesn't matter.
return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
case Stmt::CXXUuidofExprClass:
return cast<CXXUuidofExpr>(E)->getGuidDecl();
default:
return nullptr;
}
}
namespace {
enum {
AO_Bit_Field = 0,
AO_Vector_Element = 1,
AO_Property_Expansion = 2,
AO_Register_Variable = 3,
AO_Matrix_Element = 4,
AO_No_Error = 5
};
}
/// Diagnose invalid operand for address of operations.
///
/// \param Type The type of operand which cannot have its address taken.
static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
Expr *E, unsigned Type) {
S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
}
bool Sema::CheckUseOfCXXMethodAsAddressOfOperand(SourceLocation OpLoc,
const Expr *Op,
const CXXMethodDecl *MD) {
const auto *DRE = cast<DeclRefExpr>(Op->IgnoreParens());
if (Op != DRE)
return Diag(OpLoc, diag::err_parens_pointer_member_function)
<< Op->getSourceRange();
// Taking the address of a dtor is illegal per C++ [class.dtor]p2.
if (isa<CXXDestructorDecl>(MD))
return Diag(OpLoc, diag::err_typecheck_addrof_dtor)
<< DRE->getSourceRange();
if (DRE->getQualifier())
return false;
if (MD->getParent()->getName().empty())
return Diag(OpLoc, diag::err_unqualified_pointer_member_function)
<< DRE->getSourceRange();
SmallString<32> Str;
StringRef Qual = (MD->getParent()->getName() + "::").toStringRef(Str);
return Diag(OpLoc, diag::err_unqualified_pointer_member_function)
<< DRE->getSourceRange()
<< FixItHint::CreateInsertion(DRE->getSourceRange().getBegin(), Qual);
}
/// CheckAddressOfOperand - The operand of & must be either a function
/// designator or an lvalue designating an object. If it is an lvalue, the
/// object cannot be declared with storage class register or be a bit field.
/// Note: The usual conversions are *not* applied to the operand of the &
/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
/// In C++, the operand might be an overloaded function name, in which case
/// we allow the '&' but retain the overloaded-function type.
QualType Sema::CheckAddressOfOperand(ExprResult &OrigOp, SourceLocation OpLoc) {
if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
if (PTy->getKind() == BuiltinType::Overload) {
Expr *E = OrigOp.get()->IgnoreParens();
if (!isa<OverloadExpr>(E)) {
assert(cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf);
Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof_addrof_function)
<< OrigOp.get()->getSourceRange();
return QualType();
}
OverloadExpr *Ovl = cast<OverloadExpr>(E);
if (isa<UnresolvedMemberExpr>(Ovl))
if (!ResolveSingleFunctionTemplateSpecialization(Ovl)) {
Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
<< OrigOp.get()->getSourceRange();
return QualType();
}
return Context.OverloadTy;
}
if (PTy->getKind() == BuiltinType::UnknownAny)
return Context.UnknownAnyTy;
if (PTy->getKind() == BuiltinType::BoundMember) {
Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
<< OrigOp.get()->getSourceRange();
return QualType();
}
OrigOp = CheckPlaceholderExpr(OrigOp.get());
if (OrigOp.isInvalid()) return QualType();
}
if (OrigOp.get()->isTypeDependent())
return Context.DependentTy;
assert(!OrigOp.get()->hasPlaceholderType());
// Make sure to ignore parentheses in subsequent checks
Expr *op = OrigOp.get()->IgnoreParens();
// In OpenCL captures for blocks called as lambda functions
// are located in the private address space. Blocks used in
// enqueue_kernel can be located in a different address space
// depending on a vendor implementation. Thus preventing
// taking an address of the capture to avoid invalid AS casts.
if (LangOpts.OpenCL) {
auto* VarRef = dyn_cast<DeclRefExpr>(op);
if (VarRef && VarRef->refersToEnclosingVariableOrCapture()) {
Diag(op->getExprLoc(), diag::err_opencl_taking_address_capture);
return QualType();
}
}
if (getLangOpts().C99) {
// Implement C99-only parts of addressof rules.
if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
if (uOp->getOpcode() == UO_Deref)
// Per C99 6.5.3.2, the address of a deref always returns a valid result
// (assuming the deref expression is valid).
return uOp->getSubExpr()->getType();
}
// Technically, there should be a check for array subscript
// expressions here, but the result of one is always an lvalue anyway.
}
ValueDecl *dcl = getPrimaryDecl(op);
if (auto *FD = dyn_cast_or_null<FunctionDecl>(dcl))
if (!checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
op->getBeginLoc()))
return QualType();
Expr::LValueClassification lval = op->ClassifyLValue(Context);
unsigned AddressOfError = AO_No_Error;
if (lval == Expr::LV_ClassTemporary || lval == Expr::LV_ArrayTemporary) {
bool sfinae = (bool)isSFINAEContext();
Diag(OpLoc, isSFINAEContext() ? diag::err_typecheck_addrof_temporary
: diag::ext_typecheck_addrof_temporary)
<< op->getType() << op->getSourceRange();
if (sfinae)
return QualType();
// Materialize the temporary as an lvalue so that we can take its address.
OrigOp = op =
CreateMaterializeTemporaryExpr(op->getType(), OrigOp.get(), true);
} else if (isa<ObjCSelectorExpr>(op)) {
return Context.getPointerType(op->getType());
} else if (lval == Expr::LV_MemberFunction) {
// If it's an instance method, make a member pointer.
// The expression must have exactly the form &A::foo.
// If the underlying expression isn't a decl ref, give up.
if (!isa<DeclRefExpr>(op)) {
Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
<< OrigOp.get()->getSourceRange();
return QualType();
}
DeclRefExpr *DRE = cast<DeclRefExpr>(op);
CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
CheckUseOfCXXMethodAsAddressOfOperand(OpLoc, OrigOp.get(), MD);
QualType MPTy = Context.getMemberPointerType(
op->getType(), Context.getTypeDeclType(MD->getParent()).getTypePtr());
// Under the MS ABI, lock down the inheritance model now.
if (Context.getTargetInfo().getCXXABI().isMicrosoft())
(void)isCompleteType(OpLoc, MPTy);
return MPTy;
} else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
// C99 6.5.3.2p1
// The operand must be either an l-value or a function designator
if (!op->getType()->isFunctionType()) {
// Use a special diagnostic for loads from property references.
if (isa<PseudoObjectExpr>(op)) {
AddressOfError = AO_Property_Expansion;
} else {
Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
<< op->getType() << op->getSourceRange();
return QualType();
}
} else if (const auto *DRE = dyn_cast<DeclRefExpr>(op)) {
if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(DRE->getDecl()))
CheckUseOfCXXMethodAsAddressOfOperand(OpLoc, OrigOp.get(), MD);
}
} else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
// The operand cannot be a bit-field
AddressOfError = AO_Bit_Field;
} else if (op->getObjectKind() == OK_VectorComponent) {
// The operand cannot be an element of a vector
AddressOfError = AO_Vector_Element;
} else if (op->getObjectKind() == OK_MatrixComponent) {
// The operand cannot be an element of a matrix.
AddressOfError = AO_Matrix_Element;
} else if (dcl) { // C99 6.5.3.2p1
// We have an lvalue with a decl. Make sure the decl is not declared
// with the register storage-class specifier.
if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
// in C++ it is not error to take address of a register
// variable (c++03 7.1.1P3)
if (vd->getStorageClass() == SC_Register &&
!getLangOpts().CPlusPlus) {
AddressOfError = AO_Register_Variable;
}
} else if (isa<MSPropertyDecl>(dcl)) {
AddressOfError = AO_Property_Expansion;
} else if (isa<FunctionTemplateDecl>(dcl)) {
return Context.OverloadTy;
} else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
// Okay: we can take the address of a field.
// Could be a pointer to member, though, if there is an explicit
// scope qualifier for the class.
if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
DeclContext *Ctx = dcl->getDeclContext();
if (Ctx && Ctx->isRecord()) {
if (dcl->getType()->isReferenceType()) {
Diag(OpLoc,
diag::err_cannot_form_pointer_to_member_of_reference_type)
<< dcl->getDeclName() << dcl->getType();
return QualType();
}
while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
Ctx = Ctx->getParent();
QualType MPTy = Context.getMemberPointerType(
op->getType(),
Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
// Under the MS ABI, lock down the inheritance model now.
if (Context.getTargetInfo().getCXXABI().isMicrosoft())
(void)isCompleteType(OpLoc, MPTy);
return MPTy;
}
}
} else if (!isa<FunctionDecl, NonTypeTemplateParmDecl, BindingDecl,
MSGuidDecl, UnnamedGlobalConstantDecl>(dcl))
llvm_unreachable("Unknown/unexpected decl type");
}
if (AddressOfError != AO_No_Error) {
diagnoseAddressOfInvalidType(*this, OpLoc, op, AddressOfError);
return QualType();
}
if (lval == Expr::LV_IncompleteVoidType) {
// Taking the address of a void variable is technically illegal, but we
// allow it in cases which are otherwise valid.
// Example: "extern void x; void* y = &x;".
Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
}
// If the operand has type "type", the result has type "pointer to type".
if (op->getType()->isObjCObjectType())
return Context.getObjCObjectPointerType(op->getType());
// Cannot take the address of WebAssembly references or tables.
if (Context.getTargetInfo().getTriple().isWasm()) {
QualType OpTy = op->getType();
if (OpTy.isWebAssemblyReferenceType()) {
Diag(OpLoc, diag::err_wasm_ca_reference)
<< 1 << OrigOp.get()->getSourceRange();
return QualType();
}
if (OpTy->isWebAssemblyTableType()) {
Diag(OpLoc, diag::err_wasm_table_pr)
<< 1 << OrigOp.get()->getSourceRange();
return QualType();
}
}
CheckAddressOfPackedMember(op);
return Context.getPointerType(op->getType());
}
static void RecordModifiableNonNullParam(Sema &S, const Expr *Exp) {
const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Exp);
if (!DRE)
return;
const Decl *D = DRE->getDecl();
if (!D)
return;
const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D);
if (!Param)
return;
if (const FunctionDecl* FD = dyn_cast<FunctionDecl>(Param->getDeclContext()))
if (!FD->hasAttr<NonNullAttr>() && !Param->hasAttr<NonNullAttr>())
return;
if (FunctionScopeInfo *FD = S.getCurFunction())
FD->ModifiedNonNullParams.insert(Param);
}
/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
SourceLocation OpLoc,
bool IsAfterAmp = false) {
if (Op->isTypeDependent())
return S.Context.DependentTy;
ExprResult ConvResult = S.UsualUnaryConversions(Op);
if (ConvResult.isInvalid())
return QualType();
Op = ConvResult.get();
QualType OpTy = Op->getType();
QualType Result;
if (isa<CXXReinterpretCastExpr>(Op)) {
QualType OpOrigType = Op->IgnoreParenCasts()->getType();
S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
Op->getSourceRange());
}
if (const PointerType *PT = OpTy->getAs<PointerType>())
{
Result = PT->getPointeeType();
}
else if (const ObjCObjectPointerType *OPT =
OpTy->getAs<ObjCObjectPointerType>())
Result = OPT->getPointeeType();
else {
ExprResult PR = S.CheckPlaceholderExpr(Op);
if (PR.isInvalid()) return QualType();
if (PR.get() != Op)
return CheckIndirectionOperand(S, PR.get(), VK, OpLoc);
}
if (Result.isNull()) {
S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
<< OpTy << Op->getSourceRange();
return QualType();
}
if (Result->isVoidType()) {
// C++ [expr.unary.op]p1:
// [...] the expression to which [the unary * operator] is applied shall
// be a pointer to an object type, or a pointer to a function type
LangOptions LO = S.getLangOpts();
if (LO.CPlusPlus)
S.Diag(OpLoc, diag::err_typecheck_indirection_through_void_pointer_cpp)
<< OpTy << Op->getSourceRange();
else if (!(LO.C99 && IsAfterAmp) && !S.isUnevaluatedContext())
S.Diag(OpLoc, diag::ext_typecheck_indirection_through_void_pointer)
<< OpTy << Op->getSourceRange();
}
// Dereferences are usually l-values...
VK = VK_LValue;
// ...except that certain expressions are never l-values in C.
if (!S.getLangOpts().CPlusPlus && Result.isCForbiddenLValueType())
VK = VK_PRValue;
return Result;
}
BinaryOperatorKind Sema::ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind) {
BinaryOperatorKind Opc;
switch (Kind) {
default: llvm_unreachable("Unknown binop!");
case tok::periodstar: Opc = BO_PtrMemD; break;
case tok::arrowstar: Opc = BO_PtrMemI; break;
case tok::star: Opc = BO_Mul; break;
case tok::slash: Opc = BO_Div; break;
case tok::percent: Opc = BO_Rem; break;
case tok::plus: Opc = BO_Add; break;
case tok::minus: Opc = BO_Sub; break;
case tok::lessless: Opc = BO_Shl; break;
case tok::greatergreater: Opc = BO_Shr; break;
case tok::lessequal: Opc = BO_LE; break;
case tok::less: Opc = BO_LT; break;
case tok::greaterequal: Opc = BO_GE; break;
case tok::greater: Opc = BO_GT; break;
case tok::exclaimequal: Opc = BO_NE; break;
case tok::equalequal: Opc = BO_EQ; break;
case tok::spaceship: Opc = BO_Cmp; break;
case tok::amp: Opc = BO_And; break;
case tok::caret: Opc = BO_Xor; break;
case tok::pipe: Opc = BO_Or; break;
case tok::ampamp: Opc = BO_LAnd; break;
case tok::pipepipe: Opc = BO_LOr; break;
case tok::equal: Opc = BO_Assign; break;
case tok::starequal: Opc = BO_MulAssign; break;
case tok::slashequal: Opc = BO_DivAssign; break;
case tok::percentequal: Opc = BO_RemAssign; break;
case tok::plusequal: Opc = BO_AddAssign; break;
case tok::minusequal: Opc = BO_SubAssign; break;
case tok::lesslessequal: Opc = BO_ShlAssign; break;
case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
case tok::ampequal: Opc = BO_AndAssign; break;
case tok::caretequal: Opc = BO_XorAssign; break;
case tok::pipeequal: Opc = BO_OrAssign; break;
case tok::comma: Opc = BO_Comma; break;
}
return Opc;
}
static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
tok::TokenKind Kind) {
UnaryOperatorKind Opc;
switch (Kind) {
default: llvm_unreachable("Unknown unary op!");
case tok::plusplus: Opc = UO_PreInc; break;
case tok::minusminus: Opc = UO_PreDec; break;
case tok::amp: Opc = UO_AddrOf; break;
case tok::star: Opc = UO_Deref; break;
case tok::plus: Opc = UO_Plus; break;
case tok::minus: Opc = UO_Minus; break;
case tok::tilde: Opc = UO_Not; break;
case tok::exclaim: Opc = UO_LNot; break;
case tok::kw___real: Opc = UO_Real; break;
case tok::kw___imag: Opc = UO_Imag; break;
case tok::kw___extension__: Opc = UO_Extension; break;
}
return Opc;
}
const FieldDecl *
Sema::getSelfAssignmentClassMemberCandidate(const ValueDecl *SelfAssigned) {
// Explore the case for adding 'this->' to the LHS of a self assignment, very
// common for setters.
// struct A {
// int X;
// -void setX(int X) { X = X; }
// +void setX(int X) { this->X = X; }
// };
// Only consider parameters for self assignment fixes.
if (!isa<ParmVarDecl>(SelfAssigned))
return nullptr;
const auto *Method =
dyn_cast_or_null<CXXMethodDecl>(getCurFunctionDecl(true));
if (!Method)
return nullptr;
const CXXRecordDecl *Parent = Method->getParent();
// In theory this is fixable if the lambda explicitly captures this, but
// that's added complexity that's rarely going to be used.
if (Parent->isLambda())
return nullptr;
// FIXME: Use an actual Lookup operation instead of just traversing fields
// in order to get base class fields.
auto Field =
llvm::find_if(Parent->fields(),
[Name(SelfAssigned->getDeclName())](const FieldDecl *F) {
return F->getDeclName() == Name;
});
return (Field != Parent->field_end()) ? *Field : nullptr;
}
/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
/// This warning suppressed in the event of macro expansions.
static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
SourceLocation OpLoc, bool IsBuiltin) {
if (S.inTemplateInstantiation())
return;
if (S.isUnevaluatedContext())
return;
if (OpLoc.isInvalid() || OpLoc.isMacroID())
return;
LHSExpr = LHSExpr->IgnoreParenImpCasts();
RHSExpr = RHSExpr->IgnoreParenImpCasts();
const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
if (!LHSDeclRef || !RHSDeclRef ||
LHSDeclRef->getLocation().isMacroID() ||
RHSDeclRef->getLocation().isMacroID())
return;
const ValueDecl *LHSDecl =
cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
const ValueDecl *RHSDecl =
cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
if (LHSDecl != RHSDecl)
return;
if (LHSDecl->getType().isVolatileQualified())
return;
if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
if (RefTy->getPointeeType().isVolatileQualified())
return;
auto Diag = S.Diag(OpLoc, IsBuiltin ? diag::warn_self_assignment_builtin
: diag::warn_self_assignment_overloaded)
<< LHSDeclRef->getType() << LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
if (const FieldDecl *SelfAssignField =
S.getSelfAssignmentClassMemberCandidate(RHSDecl))
Diag << 1 << SelfAssignField
<< FixItHint::CreateInsertion(LHSDeclRef->getBeginLoc(), "this->");
else
Diag << 0;
}
/// Check if a bitwise-& is performed on an Objective-C pointer. This
/// is usually indicative of introspection within the Objective-C pointer.
static void checkObjCPointerIntrospection(Sema &S, ExprResult &L, ExprResult &R,
SourceLocation OpLoc) {
if (!S.getLangOpts().ObjC)
return;
const Expr *ObjCPointerExpr = nullptr, *OtherExpr = nullptr;
const Expr *LHS = L.get();
const Expr *RHS = R.get();
if (LHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
ObjCPointerExpr = LHS;
OtherExpr = RHS;
}
else if (RHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
ObjCPointerExpr = RHS;
OtherExpr = LHS;
}
// This warning is deliberately made very specific to reduce false
// positives with logic that uses '&' for hashing. This logic mainly
// looks for code trying to introspect into tagged pointers, which
// code should generally never do.
if (ObjCPointerExpr && isa<IntegerLiteral>(OtherExpr->IgnoreParenCasts())) {
unsigned Diag = diag::warn_objc_pointer_masking;
// Determine if we are introspecting the result of performSelectorXXX.
const Expr *Ex = ObjCPointerExpr->IgnoreParenCasts();
// Special case messages to -performSelector and friends, which
// can return non-pointer values boxed in a pointer value.
// Some clients may wish to silence warnings in this subcase.
if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(Ex)) {
Selector S = ME->getSelector();
StringRef SelArg0 = S.getNameForSlot(0);
if (SelArg0.starts_with("performSelector"))
Diag = diag::warn_objc_pointer_masking_performSelector;
}
S.Diag(OpLoc, Diag)
<< ObjCPointerExpr->getSourceRange();
}
}
static NamedDecl *getDeclFromExpr(Expr *E) {
if (!E)
return nullptr;
if (auto *DRE = dyn_cast<DeclRefExpr>(E))
return DRE->getDecl();
if (auto *ME = dyn_cast<MemberExpr>(E))
return ME->getMemberDecl();
if (auto *IRE = dyn_cast<ObjCIvarRefExpr>(E))
return IRE->getDecl();
return nullptr;
}
// This helper function promotes a binary operator's operands (which are of a
// half vector type) to a vector of floats and then truncates the result to
// a vector of either half or short.
static ExprResult convertHalfVecBinOp(Sema &S, ExprResult LHS, ExprResult RHS,
BinaryOperatorKind Opc, QualType ResultTy,
ExprValueKind VK, ExprObjectKind OK,
bool IsCompAssign, SourceLocation OpLoc,
FPOptionsOverride FPFeatures) {
auto &Context = S.getASTContext();
assert((isVector(ResultTy, Context.HalfTy) ||
isVector(ResultTy, Context.ShortTy)) &&
"Result must be a vector of half or short");
assert(isVector(LHS.get()->getType(), Context.HalfTy) &&
isVector(RHS.get()->getType(), Context.HalfTy) &&
"both operands expected to be a half vector");
RHS = convertVector(RHS.get(), Context.FloatTy, S);
QualType BinOpResTy = RHS.get()->getType();
// If Opc is a comparison, ResultType is a vector of shorts. In that case,
// change BinOpResTy to a vector of ints.
if (isVector(ResultTy, Context.ShortTy))
BinOpResTy = S.GetSignedVectorType(BinOpResTy);
if (IsCompAssign)
return CompoundAssignOperator::Create(Context, LHS.get(), RHS.get(), Opc,
ResultTy, VK, OK, OpLoc, FPFeatures,
BinOpResTy, BinOpResTy);
LHS = convertVector(LHS.get(), Context.FloatTy, S);
auto *BO = BinaryOperator::Create(Context, LHS.get(), RHS.get(), Opc,
BinOpResTy, VK, OK, OpLoc, FPFeatures);
return convertVector(BO, ResultTy->castAs<VectorType>()->getElementType(), S);
}
static std::pair<ExprResult, ExprResult>
CorrectDelayedTyposInBinOp(Sema &S, BinaryOperatorKind Opc, Expr *LHSExpr,
Expr *RHSExpr) {
ExprResult LHS = LHSExpr, RHS = RHSExpr;
if (!S.Context.isDependenceAllowed()) {
// C cannot handle TypoExpr nodes on either side of a binop because it
// doesn't handle dependent types properly, so make sure any TypoExprs have
// been dealt with before checking the operands.
LHS = S.CorrectDelayedTyposInExpr(LHS);
RHS = S.CorrectDelayedTyposInExpr(
RHS, /*InitDecl=*/nullptr, /*RecoverUncorrectedTypos=*/false,
[Opc, LHS](Expr *E) {
if (Opc != BO_Assign)
return ExprResult(E);
// Avoid correcting the RHS to the same Expr as the LHS.
Decl *D = getDeclFromExpr(E);
return (D && D == getDeclFromExpr(LHS.get())) ? ExprError() : E;
});
}
return std::make_pair(LHS, RHS);
}
/// Returns true if conversion between vectors of halfs and vectors of floats
/// is needed.
static bool needsConversionOfHalfVec(bool OpRequiresConversion, ASTContext &Ctx,
Expr *E0, Expr *E1 = nullptr) {
if (!OpRequiresConversion || Ctx.getLangOpts().NativeHalfType ||
Ctx.getTargetInfo().useFP16ConversionIntrinsics())
return false;
auto HasVectorOfHalfType = [&Ctx](Expr *E) {
QualType Ty = E->IgnoreImplicit()->getType();
// Don't promote half precision neon vectors like float16x4_t in arm_neon.h
// to vectors of floats. Although the element type of the vectors is __fp16,
// the vectors shouldn't be treated as storage-only types. See the
// discussion here: https://reviews.llvm.org/rG825235c140e7
if (const VectorType *VT = Ty->getAs<VectorType>()) {
if (VT->getVectorKind() == VectorKind::Neon)
return false;
return VT->getElementType().getCanonicalType() == Ctx.HalfTy;
}
return false;
};
return HasVectorOfHalfType(E0) && (!E1 || HasVectorOfHalfType(E1));
}
/// CreateBuiltinBinOp - Creates a new built-in binary operation with
/// operator @p Opc at location @c TokLoc. This routine only supports
/// built-in operations; ActOnBinOp handles overloaded operators.
ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
BinaryOperatorKind Opc,
Expr *LHSExpr, Expr *RHSExpr) {
if (getLangOpts().CPlusPlus11 && isa<InitListExpr>(RHSExpr)) {
// The syntax only allows initializer lists on the RHS of assignment,
// so we don't need to worry about accepting invalid code for
// non-assignment operators.
// C++11 5.17p9:
// The meaning of x = {v} [...] is that of x = T(v) [...]. The meaning
// of x = {} is x = T().
InitializationKind Kind = InitializationKind::CreateDirectList(
RHSExpr->getBeginLoc(), RHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
InitializedEntity Entity =
InitializedEntity::InitializeTemporary(LHSExpr->getType());
InitializationSequence InitSeq(*this, Entity, Kind, RHSExpr);
ExprResult Init = InitSeq.Perform(*this, Entity, Kind, RHSExpr);
if (Init.isInvalid())
return Init;
RHSExpr = Init.get();
}
ExprResult LHS = LHSExpr, RHS = RHSExpr;
QualType ResultTy; // Result type of the binary operator.
// The following two variables are used for compound assignment operators
QualType CompLHSTy; // Type of LHS after promotions for computation
QualType CompResultTy; // Type of computation result
ExprValueKind VK = VK_PRValue;
ExprObjectKind OK = OK_Ordinary;
bool ConvertHalfVec = false;
std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
if (!LHS.isUsable() || !RHS.isUsable())
return ExprError();
if (getLangOpts().OpenCL) {
QualType LHSTy = LHSExpr->getType();
QualType RHSTy = RHSExpr->getType();
// OpenCLC v2.0 s6.13.11.1 allows atomic variables to be initialized by
// the ATOMIC_VAR_INIT macro.
if (LHSTy->isAtomicType() || RHSTy->isAtomicType()) {
SourceRange SR(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
if (BO_Assign == Opc)
Diag(OpLoc, diag::err_opencl_atomic_init) << 0 << SR;
else
ResultTy = InvalidOperands(OpLoc, LHS, RHS);
return ExprError();
}
// OpenCL special types - image, sampler, pipe, and blocks are to be used
// only with a builtin functions and therefore should be disallowed here.
if (LHSTy->isImageType() || RHSTy->isImageType() ||
LHSTy->isSamplerT() || RHSTy->isSamplerT() ||
LHSTy->isPipeType() || RHSTy->isPipeType() ||
LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
ResultTy = InvalidOperands(OpLoc, LHS, RHS);
return ExprError();
}
}
checkTypeSupport(LHSExpr->getType(), OpLoc, /*ValueDecl*/ nullptr);
checkTypeSupport(RHSExpr->getType(), OpLoc, /*ValueDecl*/ nullptr);
switch (Opc) {
case BO_Assign:
ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType(), Opc);
if (getLangOpts().CPlusPlus &&
LHS.get()->getObjectKind() != OK_ObjCProperty) {
VK = LHS.get()->getValueKind();
OK = LHS.get()->getObjectKind();
}
if (!ResultTy.isNull()) {
DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc, true);
DiagnoseSelfMove(LHS.get(), RHS.get(), OpLoc);
// Avoid copying a block to the heap if the block is assigned to a local
// auto variable that is declared in the same scope as the block. This
// optimization is unsafe if the local variable is declared in an outer
// scope. For example:
//
// BlockTy b;
// {
// b = ^{...};
// }
// // It is unsafe to invoke the block here if it wasn't copied to the
// // heap.
// b();
if (auto *BE = dyn_cast<BlockExpr>(RHS.get()->IgnoreParens()))
if (auto *DRE = dyn_cast<DeclRefExpr>(LHS.get()->IgnoreParens()))
if (auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
if (VD->hasLocalStorage() && getCurScope()->isDeclScope(VD))
BE->getBlockDecl()->setCanAvoidCopyToHeap();
if (LHS.get()->getType().hasNonTrivialToPrimitiveCopyCUnion())
checkNonTrivialCUnion(LHS.get()->getType(), LHS.get()->getExprLoc(),
NTCUC_Assignment, NTCUK_Copy);
}
RecordModifiableNonNullParam(*this, LHS.get());
break;
case BO_PtrMemD:
case BO_PtrMemI:
ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
Opc == BO_PtrMemI);
break;
case BO_Mul:
case BO_Div:
ConvertHalfVec = true;
ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
Opc == BO_Div);
break;
case BO_Rem:
ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
break;
case BO_Add:
ConvertHalfVec = true;
ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc);
break;
case BO_Sub:
ConvertHalfVec = true;
ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
break;
case BO_Shl:
case BO_Shr:
ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
break;
case BO_LE:
case BO_LT:
case BO_GE:
case BO_GT:
ConvertHalfVec = true;
ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
break;
case BO_EQ:
case BO_NE:
ConvertHalfVec = true;
ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
break;
case BO_Cmp:
ConvertHalfVec = true;
ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
assert(ResultTy.isNull() || ResultTy->getAsCXXRecordDecl());
break;
case BO_And:
checkObjCPointerIntrospection(*this, LHS, RHS, OpLoc);
[[fallthrough]];
case BO_Xor:
case BO_Or:
ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
break;
case BO_LAnd:
case BO_LOr:
ConvertHalfVec = true;
ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
break;
case BO_MulAssign:
case BO_DivAssign:
ConvertHalfVec = true;
CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
Opc == BO_DivAssign);
CompLHSTy = CompResultTy;
if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
ResultTy =
CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy, Opc);
break;
case BO_RemAssign:
CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
CompLHSTy = CompResultTy;
if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
ResultTy =
CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy, Opc);
break;
case BO_AddAssign:
ConvertHalfVec = true;
CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc, &CompLHSTy);
if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
ResultTy =
CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy, Opc);
break;
case BO_SubAssign:
ConvertHalfVec = true;
CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
ResultTy =
CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy, Opc);
break;
case BO_ShlAssign:
case BO_ShrAssign:
CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
CompLHSTy = CompResultTy;
if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
ResultTy =
CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy, Opc);
break;
case BO_AndAssign:
case BO_OrAssign: // fallthrough
DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc, true);
[[fallthrough]];
case BO_XorAssign:
CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
CompLHSTy = CompResultTy;
if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
ResultTy =
CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy, Opc);
break;
case BO_Comma:
ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
if (getLangOpts().CPlusPlus && !RHS.isInvalid()) {
VK = RHS.get()->getValueKind();
OK = RHS.get()->getObjectKind();
}
break;
}
if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
return ExprError();
// Some of the binary operations require promoting operands of half vector to
// float vectors and truncating the result back to half vector. For now, we do
// this only when HalfArgsAndReturn is set (that is, when the target is arm or
// arm64).
assert(
(Opc == BO_Comma || isVector(RHS.get()->getType(), Context.HalfTy) ==
isVector(LHS.get()->getType(), Context.HalfTy)) &&
"both sides are half vectors or neither sides are");
ConvertHalfVec =
needsConversionOfHalfVec(ConvertHalfVec, Context, LHS.get(), RHS.get());
// Check for array bounds violations for both sides of the BinaryOperator
CheckArrayAccess(LHS.get());
CheckArrayAccess(RHS.get());
if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(LHS.get()->IgnoreParenCasts())) {
NamedDecl *ObjectSetClass = LookupSingleName(TUScope,
&Context.Idents.get("object_setClass"),
SourceLocation(), LookupOrdinaryName);
if (ObjectSetClass && isa<ObjCIsaExpr>(LHS.get())) {
SourceLocation RHSLocEnd = getLocForEndOfToken(RHS.get()->getEndLoc());
Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign)
<< FixItHint::CreateInsertion(LHS.get()->getBeginLoc(),
"object_setClass(")
<< FixItHint::CreateReplacement(SourceRange(OISA->getOpLoc(), OpLoc),
",")
<< FixItHint::CreateInsertion(RHSLocEnd, ")");
}
else
Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign);
}
else if (const ObjCIvarRefExpr *OIRE =
dyn_cast<ObjCIvarRefExpr>(LHS.get()->IgnoreParenCasts()))
DiagnoseDirectIsaAccess(*this, OIRE, OpLoc, RHS.get());
// Opc is not a compound assignment if CompResultTy is null.
if (CompResultTy.isNull()) {
if (ConvertHalfVec)
return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, false,
OpLoc, CurFPFeatureOverrides());
return BinaryOperator::Create(Context, LHS.get(), RHS.get(), Opc, ResultTy,
VK, OK, OpLoc, CurFPFeatureOverrides());
}
// Handle compound assignments.
if (getLangOpts().CPlusPlus && LHS.get()->getObjectKind() !=
OK_ObjCProperty) {
VK = VK_LValue;
OK = LHS.get()->getObjectKind();
}
// The LHS is not converted to the result type for fixed-point compound
// assignment as the common type is computed on demand. Reset the CompLHSTy
// to the LHS type we would have gotten after unary conversions.
if (CompResultTy->isFixedPointType())
CompLHSTy = UsualUnaryConversions(LHS.get()).get()->getType();
if (ConvertHalfVec)
return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, true,
OpLoc, CurFPFeatureOverrides());
return CompoundAssignOperator::Create(
Context, LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, OpLoc,
CurFPFeatureOverrides(), CompLHSTy, CompResultTy);
}
/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
/// operators are mixed in a way that suggests that the programmer forgot that
/// comparison operators have higher precedence. The most typical example of
/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
SourceLocation OpLoc, Expr *LHSExpr,
Expr *RHSExpr) {
BinaryOperator *LHSBO = dyn_cast<BinaryOperator>(LHSExpr);
BinaryOperator *RHSBO = dyn_cast<BinaryOperator>(RHSExpr);
// Check that one of the sides is a comparison operator and the other isn't.
bool isLeftComp = LHSBO && LHSBO->isComparisonOp();
bool isRightComp = RHSBO && RHSBO->isComparisonOp();
if (isLeftComp == isRightComp)
return;
// Bitwise operations are sometimes used as eager logical ops.
// Don't diagnose this.
bool isLeftBitwise = LHSBO && LHSBO->isBitwiseOp();
bool isRightBitwise = RHSBO && RHSBO->isBitwiseOp();
if (isLeftBitwise || isRightBitwise)
return;
SourceRange DiagRange = isLeftComp
? SourceRange(LHSExpr->getBeginLoc(), OpLoc)
: SourceRange(OpLoc, RHSExpr->getEndLoc());
StringRef OpStr = isLeftComp ? LHSBO->getOpcodeStr() : RHSBO->getOpcodeStr();
SourceRange ParensRange =
isLeftComp
? SourceRange(LHSBO->getRHS()->getBeginLoc(), RHSExpr->getEndLoc())
: SourceRange(LHSExpr->getBeginLoc(), RHSBO->getLHS()->getEndLoc());
Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
<< DiagRange << BinaryOperator::getOpcodeStr(Opc) << OpStr;
SuggestParentheses(Self, OpLoc,
Self.PDiag(diag::note_precedence_silence) << OpStr,
(isLeftComp ? LHSExpr : RHSExpr)->getSourceRange());
SuggestParentheses(Self, OpLoc,
Self.PDiag(diag::note_precedence_bitwise_first)
<< BinaryOperator::getOpcodeStr(Opc),
ParensRange);
}
/// It accepts a '&&' expr that is inside a '||' one.
/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
/// in parentheses.
static void
EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
BinaryOperator *Bop) {
assert(Bop->getOpcode() == BO_LAnd);
Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
<< Bop->getSourceRange() << OpLoc;
SuggestParentheses(Self, Bop->getOperatorLoc(),
Self.PDiag(diag::note_precedence_silence)
<< Bop->getOpcodeStr(),
Bop->getSourceRange());
}
/// Look for '&&' in the left hand of a '||' expr.
static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Expr *LHSExpr, Expr *RHSExpr) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
if (Bop->getOpcode() == BO_LAnd) {
// If it's "string_literal && a || b" don't warn since the precedence
// doesn't matter.
if (!isa<StringLiteral>(Bop->getLHS()->IgnoreParenImpCasts()))
return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
} else if (Bop->getOpcode() == BO_LOr) {
if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
// If it's "a || b && string_literal || c" we didn't warn earlier for
// "a || b && string_literal", but warn now.
if (RBop->getOpcode() == BO_LAnd &&
isa<StringLiteral>(RBop->getRHS()->IgnoreParenImpCasts()))
return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
}
}
}
}
/// Look for '&&' in the right hand of a '||' expr.
static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Expr *LHSExpr, Expr *RHSExpr) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
if (Bop->getOpcode() == BO_LAnd) {
// If it's "a || b && string_literal" don't warn since the precedence
// doesn't matter.
if (!isa<StringLiteral>(Bop->getRHS()->IgnoreParenImpCasts()))
return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
}
}
}
/// Look for bitwise op in the left or right hand of a bitwise op with
/// lower precedence and emit a diagnostic together with a fixit hint that wraps
/// the '&' expression in parentheses.
static void DiagnoseBitwiseOpInBitwiseOp(Sema &S, BinaryOperatorKind Opc,
SourceLocation OpLoc, Expr *SubExpr) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
if (Bop->isBitwiseOp() && Bop->getOpcode() < Opc) {
S.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_op_in_bitwise_op)
<< Bop->getOpcodeStr() << BinaryOperator::getOpcodeStr(Opc)
<< Bop->getSourceRange() << OpLoc;
SuggestParentheses(S, Bop->getOperatorLoc(),
S.PDiag(diag::note_precedence_silence)
<< Bop->getOpcodeStr(),
Bop->getSourceRange());
}
}
}
static void DiagnoseAdditionInShift(Sema &S, SourceLocation OpLoc,
Expr *SubExpr, StringRef Shift) {
if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
if (Bop->getOpcode() == BO_Add || Bop->getOpcode() == BO_Sub) {
StringRef Op = Bop->getOpcodeStr();
S.Diag(Bop->getOperatorLoc(), diag::warn_addition_in_bitshift)
<< Bop->getSourceRange() << OpLoc << Shift << Op;
SuggestParentheses(S, Bop->getOperatorLoc(),
S.PDiag(diag::note_precedence_silence) << Op,
Bop->getSourceRange());
}
}
}
static void DiagnoseShiftCompare(Sema &S, SourceLocation OpLoc,
Expr *LHSExpr, Expr *RHSExpr) {
CXXOperatorCallExpr *OCE = dyn_cast<CXXOperatorCallExpr>(LHSExpr);
if (!OCE)
return;
FunctionDecl *FD = OCE->getDirectCallee();
if (!FD || !FD->isOverloadedOperator())
return;
OverloadedOperatorKind Kind = FD->getOverloadedOperator();
if (Kind != OO_LessLess && Kind != OO_GreaterGreater)
return;
S.Diag(OpLoc, diag::warn_overloaded_shift_in_comparison)
<< LHSExpr->getSourceRange() << RHSExpr->getSourceRange()
<< (Kind == OO_LessLess);
SuggestParentheses(S, OCE->getOperatorLoc(),
S.PDiag(diag::note_precedence_silence)
<< (Kind == OO_LessLess ? "<<" : ">>"),
OCE->getSourceRange());
SuggestParentheses(
S, OpLoc, S.PDiag(diag::note_evaluate_comparison_first),
SourceRange(OCE->getArg(1)->getBeginLoc(), RHSExpr->getEndLoc()));
}
/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
/// precedence.
static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
SourceLocation OpLoc, Expr *LHSExpr,
Expr *RHSExpr){
// Diagnose "arg1 'bitwise' arg2 'eq' arg3".
if (BinaryOperator::isBitwiseOp(Opc))
DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);
// Diagnose "arg1 & arg2 | arg3"
if ((Opc == BO_Or || Opc == BO_Xor) &&
!OpLoc.isMacroID()/* Don't warn in macros. */) {
DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, LHSExpr);
DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, RHSExpr);
}
// Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
// We don't warn for 'assert(a || b && "bad")' since this is safe.
if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
}
if ((Opc == BO_Shl && LHSExpr->getType()->isIntegralType(Self.getASTContext()))
|| Opc == BO_Shr) {
StringRef Shift = BinaryOperator::getOpcodeStr(Opc);
DiagnoseAdditionInShift(Self, OpLoc, LHSExpr, Shift);
DiagnoseAdditionInShift(Self, OpLoc, RHSExpr, Shift);
}
// Warn on overloaded shift operators and comparisons, such as:
// cout << 5 == 4;
if (BinaryOperator::isComparisonOp(Opc))
DiagnoseShiftCompare(Self, OpLoc, LHSExpr, RHSExpr);
}
// Binary Operators. 'Tok' is the token for the operator.
ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
tok::TokenKind Kind,
Expr *LHSExpr, Expr *RHSExpr) {
BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
assert(LHSExpr && "ActOnBinOp(): missing left expression");
assert(RHSExpr && "ActOnBinOp(): missing right expression");
// Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);
return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
}
void Sema::LookupBinOp(Scope *S, SourceLocation OpLoc, BinaryOperatorKind Opc,
UnresolvedSetImpl &Functions) {
OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc);
if (OverOp != OO_None && OverOp != OO_Equal)
LookupOverloadedOperatorName(OverOp, S, Functions);
// In C++20 onwards, we may have a second operator to look up.
if (getLangOpts().CPlusPlus20) {
if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(OverOp))
LookupOverloadedOperatorName(ExtraOp, S, Functions);
}
}
/// Build an overloaded binary operator expression in the given scope.
static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
BinaryOperatorKind Opc,
Expr *LHS, Expr *RHS) {
switch (Opc) {
case BO_Assign:
// In the non-overloaded case, we warn about self-assignment (x = x) for
// both simple assignment and certain compound assignments where algebra
// tells us the operation yields a constant result. When the operator is
// overloaded, we can't do the latter because we don't want to assume that
// those algebraic identities still apply; for example, a path-building
// library might use operator/= to append paths. But it's still reasonable
// to assume that simple assignment is just moving/copying values around
// and so self-assignment is likely a bug.
DiagnoseSelfAssignment(S, LHS, RHS, OpLoc, false);
[[fallthrough]];
case BO_DivAssign:
case BO_RemAssign:
case BO_SubAssign:
case BO_AndAssign:
case BO_OrAssign:
case BO_XorAssign:
CheckIdentityFieldAssignment(LHS, RHS, OpLoc, S);
break;
default:
break;
}
// Find all of the overloaded operators visible from this point.
UnresolvedSet<16> Functions;
S.LookupBinOp(Sc, OpLoc, Opc, Functions);
// Build the (potentially-overloaded, potentially-dependent)
// binary operation.
return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
}
ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
BinaryOperatorKind Opc,
Expr *LHSExpr, Expr *RHSExpr) {
ExprResult LHS, RHS;
std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
if (!LHS.isUsable() || !RHS.isUsable())
return ExprError();
LHSExpr = LHS.get();
RHSExpr = RHS.get();
// We want to end up calling one of checkPseudoObjectAssignment
// (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
// both expressions are overloadable or either is type-dependent),
// or CreateBuiltinBinOp (in any other case). We also want to get
// any placeholder types out of the way.
// Handle pseudo-objects in the LHS.
if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
// Assignments with a pseudo-object l-value need special analysis.
if (pty->getKind() == BuiltinType::PseudoObject &&
BinaryOperator::isAssignmentOp(Opc))
return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);
// Don't resolve overloads if the other type is overloadable.
if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload) {
// We can't actually test that if we still have a placeholder,
// though. Fortunately, none of the exceptions we see in that
// code below are valid when the LHS is an overload set. Note
// that an overload set can be dependently-typed, but it never
// instantiates to having an overloadable type.
ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
if (resolvedRHS.isInvalid()) return ExprError();
RHSExpr = resolvedRHS.get();
if (RHSExpr->isTypeDependent() ||
RHSExpr->getType()->isOverloadableType())
return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
}
// If we're instantiating "a.x < b" or "A::x < b" and 'x' names a function
// template, diagnose the missing 'template' keyword instead of diagnosing
// an invalid use of a bound member function.
//
// Note that "A::x < b" might be valid if 'b' has an overloadable type due
// to C++1z [over.over]/1.4, but we already checked for that case above.
if (Opc == BO_LT && inTemplateInstantiation() &&
(pty->getKind() == BuiltinType::BoundMember ||
pty->getKind() == BuiltinType::Overload)) {
auto *OE = dyn_cast<OverloadExpr>(LHSExpr);
if (OE && !OE->hasTemplateKeyword() && !OE->hasExplicitTemplateArgs() &&
llvm::any_of(OE->decls(), [](NamedDecl *ND) {
return isa<FunctionTemplateDecl>(ND);
})) {
Diag(OE->getQualifier() ? OE->getQualifierLoc().getBeginLoc()
: OE->getNameLoc(),
diag::err_template_kw_missing)
<< OE->getName().getAsString() << "";
return ExprError();
}
}
ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
if (LHS.isInvalid()) return ExprError();
LHSExpr = LHS.get();
}
// Handle pseudo-objects in the RHS.
if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
// An overload in the RHS can potentially be resolved by the type
// being assigned to.
if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
if (getLangOpts().CPlusPlus &&
(LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent() ||
LHSExpr->getType()->isOverloadableType()))
return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
}
// Don't resolve overloads if the other type is overloadable.
if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload &&
LHSExpr->getType()->isOverloadableType())
return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
if (!resolvedRHS.isUsable()) return ExprError();
RHSExpr = resolvedRHS.get();
}
if (getLangOpts().CPlusPlus) {
// If either expression is type-dependent, always build an
// overloaded op.
if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
// Otherwise, build an overloaded op if either expression has an
// overloadable type.
if (LHSExpr->getType()->isOverloadableType() ||
RHSExpr->getType()->isOverloadableType())
return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
}
if (getLangOpts().RecoveryAST &&
(LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())) {
assert(!getLangOpts().CPlusPlus);
assert((LHSExpr->containsErrors() || RHSExpr->containsErrors()) &&
"Should only occur in error-recovery path.");
if (BinaryOperator::isCompoundAssignmentOp(Opc))
// C [6.15.16] p3:
// An assignment expression has the value of the left operand after the
// assignment, but is not an lvalue.
return CompoundAssignOperator::Create(
Context, LHSExpr, RHSExpr, Opc,
LHSExpr->getType().getUnqualifiedType(), VK_PRValue, OK_Ordinary,
OpLoc, CurFPFeatureOverrides());
QualType ResultType;
switch (Opc) {
case BO_Assign:
ResultType = LHSExpr->getType().getUnqualifiedType();
break;
case BO_LT:
case BO_GT:
case BO_LE:
case BO_GE:
case BO_EQ:
case BO_NE:
case BO_LAnd:
case BO_LOr:
// These operators have a fixed result type regardless of operands.
ResultType = Context.IntTy;
break;
case BO_Comma:
ResultType = RHSExpr->getType();
break;
default:
ResultType = Context.DependentTy;
break;
}
return BinaryOperator::Create(Context, LHSExpr, RHSExpr, Opc, ResultType,
VK_PRValue, OK_Ordinary, OpLoc,
CurFPFeatureOverrides());
}
// Build a built-in binary operation.
return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
}
static bool isOverflowingIntegerType(ASTContext &Ctx, QualType T) {
if (T.isNull() || T->isDependentType())
return false;
if (!Ctx.isPromotableIntegerType(T))
return true;
return Ctx.getIntWidth(T) >= Ctx.getIntWidth(Ctx.IntTy);
}
ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
UnaryOperatorKind Opc, Expr *InputExpr,
bool IsAfterAmp) {
ExprResult Input = InputExpr;
ExprValueKind VK = VK_PRValue;
ExprObjectKind OK = OK_Ordinary;
QualType resultType;
bool CanOverflow = false;
bool ConvertHalfVec = false;
if (getLangOpts().OpenCL) {
QualType Ty = InputExpr->getType();
// The only legal unary operation for atomics is '&'.
if ((Opc != UO_AddrOf && Ty->isAtomicType()) ||
// OpenCL special types - image, sampler, pipe, and blocks are to be used
// only with a builtin functions and therefore should be disallowed here.
(Ty->isImageType() || Ty->isSamplerT() || Ty->isPipeType()
|| Ty->isBlockPointerType())) {
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< InputExpr->getType()
<< Input.get()->getSourceRange());
}
}
if (getLangOpts().HLSL && OpLoc.isValid()) {
if (Opc == UO_AddrOf)
return ExprError(Diag(OpLoc, diag::err_hlsl_operator_unsupported) << 0);
if (Opc == UO_Deref)
return ExprError(Diag(OpLoc, diag::err_hlsl_operator_unsupported) << 1);
}
switch (Opc) {
case UO_PreInc:
case UO_PreDec:
case UO_PostInc:
case UO_PostDec:
resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OK,
OpLoc,
Opc == UO_PreInc ||
Opc == UO_PostInc,
Opc == UO_PreInc ||
Opc == UO_PreDec);
CanOverflow = isOverflowingIntegerType(Context, resultType);
break;
case UO_AddrOf:
resultType = CheckAddressOfOperand(Input, OpLoc);
CheckAddressOfNoDeref(InputExpr);
RecordModifiableNonNullParam(*this, InputExpr);
break;
case UO_Deref: {
Input = DefaultFunctionArrayLvalueConversion(Input.get());
if (Input.isInvalid()) return ExprError();
resultType =
CheckIndirectionOperand(*this, Input.get(), VK, OpLoc, IsAfterAmp);
break;
}
case UO_Plus:
case UO_Minus:
CanOverflow = Opc == UO_Minus &&
isOverflowingIntegerType(Context, Input.get()->getType());
Input = UsualUnaryConversions(Input.get());
if (Input.isInvalid()) return ExprError();
// Unary plus and minus require promoting an operand of half vector to a
// float vector and truncating the result back to a half vector. For now, we
// do this only when HalfArgsAndReturns is set (that is, when the target is
// arm or arm64).
ConvertHalfVec = needsConversionOfHalfVec(true, Context, Input.get());
// If the operand is a half vector, promote it to a float vector.
if (ConvertHalfVec)
Input = convertVector(Input.get(), Context.FloatTy, *this);
resultType = Input.get()->getType();
if (resultType->isDependentType())
break;
if (resultType->isArithmeticType()) // C99 6.5.3.3p1
break;
else if (resultType->isVectorType() &&
// The z vector extensions don't allow + or - with bool vectors.
(!Context.getLangOpts().ZVector ||
resultType->castAs<VectorType>()->getVectorKind() !=
VectorKind::AltiVecBool))
break;
else if (resultType->isSveVLSBuiltinType()) // SVE vectors allow + and -
break;
else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6
Opc == UO_Plus &&
resultType->isPointerType())
break;
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
case UO_Not: // bitwise complement
Input = UsualUnaryConversions(Input.get());
if (Input.isInvalid())
return ExprError();
resultType = Input.get()->getType();
if (resultType->isDependentType())
break;
// C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
if (resultType->isComplexType() || resultType->isComplexIntegerType())
// C99 does not support '~' for complex conjugation.
Diag(OpLoc, diag::ext_integer_complement_complex)
<< resultType << Input.get()->getSourceRange();
else if (resultType->hasIntegerRepresentation())
break;
else if (resultType->isExtVectorType() && Context.getLangOpts().OpenCL) {
// OpenCL v1.1 s6.3.f: The bitwise operator not (~) does not operate
// on vector float types.
QualType T = resultType->castAs<ExtVectorType>()->getElementType();
if (!T->isIntegerType())
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
} else {
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
}
break;
case UO_LNot: // logical negation
// Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
Input = DefaultFunctionArrayLvalueConversion(Input.get());
if (Input.isInvalid()) return ExprError();
resultType = Input.get()->getType();
// Though we still have to promote half FP to float...
if (resultType->isHalfType() && !Context.getLangOpts().NativeHalfType) {
Input = ImpCastExprToType(Input.get(), Context.FloatTy, CK_FloatingCast).get();
resultType = Context.FloatTy;
}
// WebAsembly tables can't be used in unary expressions.
if (resultType->isPointerType() &&
resultType->getPointeeType().isWebAssemblyReferenceType()) {
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
}
if (resultType->isDependentType())
break;
if (resultType->isScalarType() && !isScopedEnumerationType(resultType)) {
// C99 6.5.3.3p1: ok, fallthrough;
if (Context.getLangOpts().CPlusPlus) {
// C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
// operand contextually converted to bool.
Input = ImpCastExprToType(Input.get(), Context.BoolTy,
ScalarTypeToBooleanCastKind(resultType));
} else if (Context.getLangOpts().OpenCL &&
Context.getLangOpts().OpenCLVersion < 120) {
// OpenCL v1.1 6.3.h: The logical operator not (!) does not
// operate on scalar float types.
if (!resultType->isIntegerType() && !resultType->isPointerType())
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
}
} else if (resultType->isExtVectorType()) {
if (Context.getLangOpts().OpenCL &&
Context.getLangOpts().getOpenCLCompatibleVersion() < 120) {
// OpenCL v1.1 6.3.h: The logical operator not (!) does not
// operate on vector float types.
QualType T = resultType->castAs<ExtVectorType>()->getElementType();
if (!T->isIntegerType())
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
}
// Vector logical not returns the signed variant of the operand type.
resultType = GetSignedVectorType(resultType);
break;
} else if (Context.getLangOpts().CPlusPlus && resultType->isVectorType()) {
const VectorType *VTy = resultType->castAs<VectorType>();
if (VTy->getVectorKind() != VectorKind::Generic)
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
// Vector logical not returns the signed variant of the operand type.
resultType = GetSignedVectorType(resultType);
break;
} else {
return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
<< resultType << Input.get()->getSourceRange());
}
// LNot always has type int. C99 6.5.3.3p5.
// In C++, it's bool. C++ 5.3.1p8
resultType = Context.getLogicalOperationType();
break;
case UO_Real:
case UO_Imag:
resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
// _Real maps ordinary l-values into ordinary l-values. _Imag maps ordinary
// complex l-values to ordinary l-values and all other values to r-values.
if (Input.isInvalid()) return ExprError();
if (Opc == UO_Real || Input.get()->getType()->isAnyComplexType()) {
if (Input.get()->isGLValue() &&
Input.get()->getObjectKind() == OK_Ordinary)
VK = Input.get()->getValueKind();
} else if (!getLangOpts().CPlusPlus) {
// In C, a volatile scalar is read by __imag. In C++, it is not.
Input = DefaultLvalueConversion(Input.get());
}
break;
case UO_Extension:
resultType = Input.get()->getType();
VK = Input.get()->getValueKind();
OK = Input.get()->getObjectKind();
break;
case UO_Coawait:
// It's unnecessary to represent the pass-through operator co_await in the
// AST; just return the input expression instead.
assert(!Input.get()->getType()->isDependentType() &&
"the co_await expression must be non-dependant before "
"building operator co_await");
return Input;
}
if (resultType.isNull() || Input.isInvalid())
return ExprError();
// Check for array bounds violations in the operand of the UnaryOperator,
// except for the '*' and '&' operators that have to be handled specially
// by CheckArrayAccess (as there are special cases like &array[arraysize]
// that are explicitly defined as valid by the standard).
if (Opc != UO_AddrOf && Opc != UO_Deref)
CheckArrayAccess(Input.get());
auto *UO =
UnaryOperator::Create(Context, Input.get(), Opc, resultType, VK, OK,
OpLoc, CanOverflow, CurFPFeatureOverrides());
if (Opc == UO_Deref && UO->getType()->hasAttr(attr::NoDeref) &&
!isa<ArrayType>(UO->getType().getDesugaredType(Context)) &&
!isUnevaluatedContext())
ExprEvalContexts.back().PossibleDerefs.insert(UO);
// Convert the result back to a half vector.
if (ConvertHalfVec)
return convertVector(UO, Context.HalfTy, *this);
return UO;
}
/// Determine whether the given expression is a qualified member
/// access expression, of a form that could be turned into a pointer to member
/// with the address-of operator.
bool Sema::isQualifiedMemberAccess(Expr *E) {
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
if (!DRE->getQualifier())
return false;
ValueDecl *VD = DRE->getDecl();
if (!VD->isCXXClassMember())
return false;
if (isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))
return true;
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(VD))
return Method->isImplicitObjectMemberFunction();
return false;
}
if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
if (!ULE->getQualifier())
return false;
for (NamedDecl *D : ULE->decls()) {
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
if (Method->isImplicitObjectMemberFunction())
return true;
} else {
// Overload set does not contain methods.
break;
}
}
return false;
}
return false;
}
ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
UnaryOperatorKind Opc, Expr *Input,
bool IsAfterAmp) {
// First things first: handle placeholders so that the
// overloaded-operator check considers the right type.
if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
// Increment and decrement of pseudo-object references.
if (pty->getKind() == BuiltinType::PseudoObject &&
UnaryOperator::isIncrementDecrementOp(Opc))
return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);
// extension is always a builtin operator.
if (Opc == UO_Extension)
return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
// & gets special logic for several kinds of placeholder.
// The builtin code knows what to do.
if (Opc == UO_AddrOf &&
(pty->getKind() == BuiltinType::Overload ||
pty->getKind() == BuiltinType::UnknownAny ||
pty->getKind() == BuiltinType::BoundMember))
return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
// Anything else needs to be handled now.
ExprResult Result = CheckPlaceholderExpr(Input);
if (Result.isInvalid()) return ExprError();
Input = Result.get();
}
if (getLangOpts().CPlusPlus && Input->getType()->isOverloadableType() &&
UnaryOperator::getOverloadedOperator(Opc) != OO_None &&
!(Opc == UO_AddrOf && isQualifiedMemberAccess(Input))) {
// Find all of the overloaded operators visible from this point.
UnresolvedSet<16> Functions;
OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
if (S && OverOp != OO_None)
LookupOverloadedOperatorName(OverOp, S, Functions);
return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
}
return CreateBuiltinUnaryOp(OpLoc, Opc, Input, IsAfterAmp);
}
// Unary Operators. 'Tok' is the token for the operator.
ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, tok::TokenKind Op,
Expr *Input, bool IsAfterAmp) {
return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input,
IsAfterAmp);
}
/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
LabelDecl *TheDecl) {
TheDecl->markUsed(Context);
// Create the AST node. The address of a label always has type 'void*'.
auto *Res = new (Context) AddrLabelExpr(
OpLoc, LabLoc, TheDecl, Context.getPointerType(Context.VoidTy));
if (getCurFunction())
getCurFunction()->AddrLabels.push_back(Res);
return Res;
}
void Sema::ActOnStartStmtExpr() {
PushExpressionEvaluationContext(ExprEvalContexts.back().Context);
// Make sure we diagnose jumping into a statement expression.
setFunctionHasBranchProtectedScope();
}
void Sema::ActOnStmtExprError() {
// Note that function is also called by TreeTransform when leaving a
// StmtExpr scope without rebuilding anything.
DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();
}
ExprResult Sema::ActOnStmtExpr(Scope *S, SourceLocation LPLoc, Stmt *SubStmt,
SourceLocation RPLoc) {
return BuildStmtExpr(LPLoc, SubStmt, RPLoc, getTemplateDepth(S));
}
ExprResult Sema::BuildStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
SourceLocation RPLoc, unsigned TemplateDepth) {
assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
if (hasAnyUnrecoverableErrorsInThisFunction())
DiscardCleanupsInEvaluationContext();
assert(!Cleanup.exprNeedsCleanups() &&
"cleanups within StmtExpr not correctly bound!");
PopExpressionEvaluationContext();
// FIXME: there are a variety of strange constraints to enforce here, for
// example, it is not possible to goto into a stmt expression apparently.
// More semantic analysis is needed.
// If there are sub-stmts in the compound stmt, take the type of the last one
// as the type of the stmtexpr.
QualType Ty = Context.VoidTy;
bool StmtExprMayBindToTemp = false;
if (!Compound->body_empty()) {
// For GCC compatibility we get the last Stmt excluding trailing NullStmts.
if (const auto *LastStmt =
dyn_cast<ValueStmt>(Compound->getStmtExprResult())) {
if (const Expr *Value = LastStmt->getExprStmt()) {
StmtExprMayBindToTemp = true;
Ty = Value->getType();
}
}
}
// FIXME: Check that expression type is complete/non-abstract; statement
// expressions are not lvalues.
Expr *ResStmtExpr =
new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc, TemplateDepth);
if (StmtExprMayBindToTemp)
return MaybeBindToTemporary(ResStmtExpr);
return ResStmtExpr;
}
ExprResult Sema::ActOnStmtExprResult(ExprResult ER) {
if (ER.isInvalid())
return ExprError();
// Do function/array conversion on the last expression, but not
// lvalue-to-rvalue. However, initialize an unqualified type.
ER = DefaultFunctionArrayConversion(ER.get());
if (ER.isInvalid())
return ExprError();
Expr *E = ER.get();
if (E->isTypeDependent())
return E;
// In ARC, if the final expression ends in a consume, splice
// the consume out and bind it later. In the alternate case
// (when dealing with a retainable type), the result
// initialization will create a produce. In both cases the
// result will be +1, and we'll need to balance that out with
// a bind.
auto *Cast = dyn_cast<ImplicitCastExpr>(E);
if (Cast && Cast->getCastKind() == CK_ARCConsumeObject)
return Cast->getSubExpr();
// FIXME: Provide a better location for the initialization.
return PerformCopyInitialization(
InitializedEntity::InitializeStmtExprResult(
E->getBeginLoc(), E->getType().getUnqualifiedType()),
SourceLocation(), E);
}
ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
TypeSourceInfo *TInfo,
ArrayRef<OffsetOfComponent> Components,
SourceLocation RParenLoc) {
QualType ArgTy = TInfo->getType();
bool Dependent = ArgTy->isDependentType();
SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
// We must have at least one component that refers to the type, and the first
// one is known to be a field designator. Verify that the ArgTy represents
// a struct/union/class.
if (!Dependent && !ArgTy->isRecordType())
return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
<< ArgTy << TypeRange);
// Type must be complete per C99 7.17p3 because a declaring a variable
// with an incomplete type would be ill-formed.
if (!Dependent
&& RequireCompleteType(BuiltinLoc, ArgTy,
diag::err_offsetof_incomplete_type, TypeRange))
return ExprError();
bool DidWarnAboutNonPOD = false;
QualType CurrentType = ArgTy;
SmallVector<OffsetOfNode, 4> Comps;
SmallVector<Expr*, 4> Exprs;
for (const OffsetOfComponent &OC : Components) {
if (OC.isBrackets) {
// Offset of an array sub-field. TODO: Should we allow vector elements?
if (!CurrentType->isDependentType()) {
const ArrayType *AT = Context.getAsArrayType(CurrentType);
if(!AT)
return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
<< CurrentType);
CurrentType = AT->getElementType();
} else
CurrentType = Context.DependentTy;
ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
if (IdxRval.isInvalid())
return ExprError();
Expr *Idx = IdxRval.get();
// The expression must be an integral expression.
// FIXME: An integral constant expression?
if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
!Idx->getType()->isIntegerType())
return ExprError(
Diag(Idx->getBeginLoc(), diag::err_typecheck_subscript_not_integer)
<< Idx->getSourceRange());
// Record this array index.
Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
Exprs.push_back(Idx);
continue;
}
// Offset of a field.
if (CurrentType->isDependentType()) {
// We have the offset of a field, but we can't look into the dependent
// type. Just record the identifier of the field.
Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
CurrentType = Context.DependentTy;
continue;
}
// We need to have a complete type to look into.
if (RequireCompleteType(OC.LocStart, CurrentType,
diag::err_offsetof_incomplete_type))
return ExprError();
// Look for the designated field.
const RecordType *RC = CurrentType->getAs<RecordType>();
if (!RC)
return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
<< CurrentType);
RecordDecl *RD = RC->getDecl();
// C++ [lib.support.types]p5:
// The macro offsetof accepts a restricted set of type arguments in this
// International Standard. type shall be a POD structure or a POD union
// (clause 9).
// C++11 [support.types]p4:
// If type is not a standard-layout class (Clause 9), the results are
// undefined.
if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
bool IsSafe = LangOpts.CPlusPlus11? CRD->isStandardLayout() : CRD->isPOD();
unsigned DiagID =
LangOpts.CPlusPlus11? diag::ext_offsetof_non_standardlayout_type
: diag::ext_offsetof_non_pod_type;
if (!IsSafe && !DidWarnAboutNonPOD && !isUnevaluatedContext()) {
Diag(BuiltinLoc, DiagID)
<< SourceRange(Components[0].LocStart, OC.LocEnd) << CurrentType;
DidWarnAboutNonPOD = true;
}
}
// Look for the field.
LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
LookupQualifiedName(R, RD);
FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
IndirectFieldDecl *IndirectMemberDecl = nullptr;
if (!MemberDecl) {
if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
MemberDecl = IndirectMemberDecl->getAnonField();
}
if (!MemberDecl) {
// Lookup could be ambiguous when looking up a placeholder variable
// __builtin_offsetof(S, _).
// In that case we would already have emitted a diagnostic
if (!R.isAmbiguous())
Diag(BuiltinLoc, diag::err_no_member)
<< OC.U.IdentInfo << RD << SourceRange(OC.LocStart, OC.LocEnd);
return ExprError();
}
// C99 7.17p3:
// (If the specified member is a bit-field, the behavior is undefined.)
//
// We diagnose this as an error.
if (MemberDecl->isBitField()) {
Diag(OC.LocEnd, diag::err_offsetof_bitfield)
<< MemberDecl->getDeclName()
<< SourceRange(BuiltinLoc, RParenLoc);
Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
return ExprError();
}
RecordDecl *Parent = MemberDecl->getParent();
if (IndirectMemberDecl)
Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
// If the member was found in a base class, introduce OffsetOfNodes for
// the base class indirections.
CXXBasePaths Paths;
if (IsDerivedFrom(OC.LocStart, CurrentType, Context.getTypeDeclType(Parent),
Paths)) {
if (Paths.getDetectedVirtual()) {
Diag(OC.LocEnd, diag::err_offsetof_field_of_virtual_base)
<< MemberDecl->getDeclName()
<< SourceRange(BuiltinLoc, RParenLoc);
return ExprError();
}
CXXBasePath &Path = Paths.front();
for (const CXXBasePathElement &B : Path)
Comps.push_back(OffsetOfNode(B.Base));
}
if (IndirectMemberDecl) {
for (auto *FI : IndirectMemberDecl->chain()) {
assert(isa<FieldDecl>(FI));
Comps.push_back(OffsetOfNode(OC.LocStart,
cast<FieldDecl>(FI), OC.LocEnd));
}
} else
Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
CurrentType = MemberDecl->getType().getNonReferenceType();
}
return OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc, TInfo,
Comps, Exprs, RParenLoc);
}
ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
SourceLocation BuiltinLoc,
SourceLocation TypeLoc,
ParsedType ParsedArgTy,
ArrayRef<OffsetOfComponent> Components,
SourceLocation RParenLoc) {
TypeSourceInfo *ArgTInfo;
QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
if (ArgTy.isNull())
return ExprError();
if (!ArgTInfo)
ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, Components, RParenLoc);
}
ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
Expr *CondExpr,
Expr *LHSExpr, Expr *RHSExpr,
SourceLocation RPLoc) {
assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
ExprValueKind VK = VK_PRValue;
ExprObjectKind OK = OK_Ordinary;
QualType resType;
bool CondIsTrue = false;
if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
resType = Context.DependentTy;
} else {
// The conditional expression is required to be a constant expression.
llvm::APSInt condEval(32);
ExprResult CondICE = VerifyIntegerConstantExpression(
CondExpr, &condEval, diag::err_typecheck_choose_expr_requires_constant);
if (CondICE.isInvalid())
return ExprError();
CondExpr = CondICE.get();
CondIsTrue = condEval.getZExtValue();
// If the condition is > zero, then the AST type is the same as the LHSExpr.
Expr *ActiveExpr = CondIsTrue ? LHSExpr : RHSExpr;
resType = ActiveExpr->getType();
VK = ActiveExpr->getValueKind();
OK = ActiveExpr->getObjectKind();
}
return new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
resType, VK, OK, RPLoc, CondIsTrue);
}
//===----------------------------------------------------------------------===//
// Clang Extensions.
//===----------------------------------------------------------------------===//
/// ActOnBlockStart - This callback is invoked when a block literal is started.
void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
if (LangOpts.CPlusPlus) {
MangleNumberingContext *MCtx;
Decl *ManglingContextDecl;
std::tie(MCtx, ManglingContextDecl) =
getCurrentMangleNumberContext(Block->getDeclContext());
if (MCtx) {
unsigned ManglingNumber = MCtx->getManglingNumber(Block);
Block->setBlockMangling(ManglingNumber, ManglingContextDecl);
}
}
PushBlockScope(CurScope, Block);
CurContext->addDecl(Block);
if (CurScope)
PushDeclContext(CurScope, Block);
else
CurContext = Block;
getCurBlock()->HasImplicitReturnType = true;
// Enter a new evaluation context to insulate the block from any
// cleanups from the enclosing full-expression.
PushExpressionEvaluationContext(
ExpressionEvaluationContext::PotentiallyEvaluated);
}
void Sema::ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
Scope *CurScope) {
assert(ParamInfo.getIdentifier() == nullptr &&
"block-id should have no identifier!");
assert(ParamInfo.getContext() == DeclaratorContext::BlockLiteral);
BlockScopeInfo *CurBlock = getCurBlock();
TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo);
QualType T = Sig->getType();
// FIXME: We should allow unexpanded parameter packs here, but that would,
// in turn, make the block expression contain unexpanded parameter packs.
if (DiagnoseUnexpandedParameterPack(CaretLoc, Sig, UPPC_Block)) {
// Drop the parameters.
FunctionProtoType::ExtProtoInfo EPI;
EPI.HasTrailingReturn = false;
EPI.TypeQuals.addConst();
T = Context.getFunctionType(Context.DependentTy, std::nullopt, EPI);
Sig = Context.getTrivialTypeSourceInfo(T);
}
// GetTypeForDeclarator always produces a function type for a block
// literal signature. Furthermore, it is always a FunctionProtoType
// unless the function was written with a typedef.
assert(T->isFunctionType() &&
"GetTypeForDeclarator made a non-function block signature");
// Look for an explicit signature in that function type.
FunctionProtoTypeLoc ExplicitSignature;
if ((ExplicitSignature = Sig->getTypeLoc()
.getAsAdjusted<FunctionProtoTypeLoc>())) {
// Check whether that explicit signature was synthesized by
// GetTypeForDeclarator. If so, don't save that as part of the
// written signature.
if (ExplicitSignature.getLocalRangeBegin() ==
ExplicitSignature.getLocalRangeEnd()) {
// This would be much cheaper if we stored TypeLocs instead of
// TypeSourceInfos.
TypeLoc Result = ExplicitSignature.getReturnLoc();
unsigned Size = Result.getFullDataSize();
Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
Sig->getTypeLoc().initializeFullCopy(Result, Size);
ExplicitSignature = FunctionProtoTypeLoc();
}
}
CurBlock->TheDecl->setSignatureAsWritten(Sig);
CurBlock->FunctionType = T;
const auto *Fn = T->castAs<FunctionType>();
QualType RetTy = Fn->getReturnType();
bool isVariadic =
(isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
CurBlock->TheDecl->setIsVariadic(isVariadic);
// Context.DependentTy is used as a placeholder for a missing block
// return type. TODO: what should we do with declarators like:
// ^ * { ... }
// If the answer is "apply template argument deduction"....
if (RetTy != Context.DependentTy) {
CurBlock->ReturnType = RetTy;
CurBlock->TheDecl->setBlockMissingReturnType(false);
CurBlock->HasImplicitReturnType = false;
}
// Push block parameters from the declarator if we had them.
SmallVector<ParmVarDecl*, 8> Params;
if (ExplicitSignature) {
for (unsigned I = 0, E = ExplicitSignature.getNumParams(); I != E; ++I) {
ParmVarDecl *Param = ExplicitSignature.getParam(I);
if (Param->getIdentifier() == nullptr && !Param->isImplicit() &&
!Param->isInvalidDecl() && !getLangOpts().CPlusPlus) {
// Diagnose this as an extension in C17 and earlier.
if (!getLangOpts().C23)
Diag(Param->getLocation(), diag::ext_parameter_name_omitted_c23);
}
Params.push_back(Param);
}
// Fake up parameter variables if we have a typedef, like
// ^ fntype { ... }
} else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
for (const auto &I : Fn->param_types()) {
ParmVarDecl *Param = BuildParmVarDeclForTypedef(
CurBlock->TheDecl, ParamInfo.getBeginLoc(), I);
Params.push_back(Param);
}
}
// Set the parameters on the block decl.
if (!Params.empty()) {
CurBlock->TheDecl->setParams(Params);
CheckParmsForFunctionDef(CurBlock->TheDecl->parameters(),
/*CheckParameterNames=*/false);
}
// Finally we can process decl attributes.
ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
// Put the parameter variables in scope.
for (auto *AI : CurBlock->TheDecl->parameters()) {
AI->setOwningFunction(CurBlock->TheDecl);
// If this has an identifier, add it to the scope stack.
if (AI->getIdentifier()) {
CheckShadow(CurBlock->TheScope, AI);
PushOnScopeChains(AI, CurBlock->TheScope);
}
if (AI->isInvalidDecl())
CurBlock->TheDecl->setInvalidDecl();
}
}
/// ActOnBlockError - If there is an error parsing a block, this callback
/// is invoked to pop the information about the block from the action impl.
void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
// Leave the expression-evaluation context.
DiscardCleanupsInEvaluationContext();
PopExpressionEvaluationContext();
// Pop off CurBlock, handle nested blocks.
PopDeclContext();
PopFunctionScopeInfo();
}
/// ActOnBlockStmtExpr - This is called when the body of a block statement
/// literal was successfully completed. ^(int x){...}
ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Stmt *Body, Scope *CurScope) {
// If blocks are disabled, emit an error.
if (!LangOpts.Blocks)
Diag(CaretLoc, diag::err_blocks_disable) << LangOpts.OpenCL;
// Leave the expression-evaluation context.
if (hasAnyUnrecoverableErrorsInThisFunction())
DiscardCleanupsInEvaluationContext();
assert(!Cleanup.exprNeedsCleanups() &&
"cleanups within block not correctly bound!");
PopExpressionEvaluationContext();
BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
BlockDecl *BD = BSI->TheDecl;
if (BSI->HasImplicitReturnType)
deduceClosureReturnType(*BSI);
QualType RetTy = Context.VoidTy;
if (!BSI->ReturnType.isNull())
RetTy = BSI->ReturnType;
bool NoReturn = BD->hasAttr<NoReturnAttr>();
QualType BlockTy;
// If the user wrote a function type in some form, try to use that.
if (!BSI->FunctionType.isNull()) {
const FunctionType *FTy = BSI->FunctionType->castAs<FunctionType>();
FunctionType::ExtInfo Ext = FTy->getExtInfo();
if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
// Turn protoless block types into nullary block types.
if (isa<FunctionNoProtoType>(FTy)) {
FunctionProtoType::ExtProtoInfo EPI;
EPI.ExtInfo = Ext;
BlockTy = Context.getFunctionType(RetTy, std::nullopt, EPI);
// Otherwise, if we don't need to change anything about the function type,
// preserve its sugar structure.
} else if (FTy->getReturnType() == RetTy &&
(!NoReturn || FTy->getNoReturnAttr())) {
BlockTy = BSI->FunctionType;
// Otherwise, make the minimal modifications to the function type.
} else {
const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
EPI.TypeQuals = Qualifiers();
EPI.ExtInfo = Ext;
BlockTy = Context.getFunctionType(RetTy, FPT->getParamTypes(), EPI);
}
// If we don't have a function type, just build one from nothing.
} else {
FunctionProtoType::ExtProtoInfo EPI;
EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
BlockTy = Context.getFunctionType(RetTy, std::nullopt, EPI);
}
DiagnoseUnusedParameters(BD->parameters());
BlockTy = Context.getBlockPointerType(BlockTy);
// If needed, diagnose invalid gotos and switches in the block.
if (getCurFunction()->NeedsScopeChecking() &&
!PP.isCodeCompletionEnabled())
DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
BD->setBody(cast<CompoundStmt>(Body));
if (Body && getCurFunction()->HasPotentialAvailabilityViolations)
DiagnoseUnguardedAvailabilityViolations(BD);
// Try to apply the named return value optimization. We have to check again
// if we can do this, though, because blocks keep return statements around
// to deduce an implicit return type.
if (getLangOpts().CPlusPlus && RetTy->isRecordType() &&
!BD->isDependentContext())
computeNRVO(Body, BSI);
if (RetTy.hasNonTrivialToPrimitiveDestructCUnion() ||
RetTy.hasNonTrivialToPrimitiveCopyCUnion())
checkNonTrivialCUnion(RetTy, BD->getCaretLocation(), NTCUC_FunctionReturn,
NTCUK_Destruct|NTCUK_Copy);
PopDeclContext();
// Set the captured variables on the block.
SmallVector<BlockDecl::Capture, 4> Captures;
for (Capture &Cap : BSI->Captures) {
if (Cap.isInvalid() || Cap.isThisCapture())
continue;
// Cap.getVariable() is always a VarDecl because
// blocks cannot capture structured bindings or other ValueDecl kinds.
auto *Var = cast<VarDecl>(Cap.getVariable());
Expr *CopyExpr = nullptr;
if (getLangOpts().CPlusPlus && Cap.isCopyCapture()) {
if (const RecordType *Record =
Cap.getCaptureType()->getAs<RecordType>()) {
// The capture logic needs the destructor, so make sure we mark it.
// Usually this is unnecessary because most local variables have
// their destructors marked at declaration time, but parameters are
// an exception because it's technically only the call site that
// actually requires the destructor.
if (isa<ParmVarDecl>(Var))
FinalizeVarWithDestructor(Var, Record);
// Enter a separate potentially-evaluated context while building block
// initializers to isolate their cleanups from those of the block
// itself.
// FIXME: Is this appropriate even when the block itself occurs in an
// unevaluated operand?
EnterExpressionEvaluationContext EvalContext(
*this, ExpressionEvaluationContext::PotentiallyEvaluated);
SourceLocation Loc = Cap.getLocation();
ExprResult Result = BuildDeclarationNameExpr(
CXXScopeSpec(), DeclarationNameInfo(Var->getDeclName(), Loc), Var);
// According to the blocks spec, the capture of a variable from
// the stack requires a const copy constructor. This is not true
// of the copy/move done to move a __block variable to the heap.
if (!Result.isInvalid() &&
!Result.get()->getType().isConstQualified()) {
Result = ImpCastExprToType(Result.get(),
Result.get()->getType().withConst(),
CK_NoOp, VK_LValue);
}
if (!Result.isInvalid()) {
Result = PerformCopyInitialization(
InitializedEntity::InitializeBlock(Var->getLocation(),
Cap.getCaptureType()),
Loc, Result.get());
}
// Build a full-expression copy expression if initialization
// succeeded and used a non-trivial constructor. Recover from
// errors by pretending that the copy isn't necessary.
if (!Result.isInvalid() &&
!cast<CXXConstructExpr>(Result.get())->getConstructor()
->isTrivial()) {
Result = MaybeCreateExprWithCleanups(Result);
CopyExpr = Result.get();
}
}
}
BlockDecl::Capture NewCap(Var, Cap.isBlockCapture(), Cap.isNested(),
CopyExpr);
Captures.push_back(NewCap);
}
BD->setCaptures(Context, Captures, BSI->CXXThisCaptureIndex != 0);
// Pop the block scope now but keep it alive to the end of this function.
AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
PoppedFunctionScopePtr ScopeRAII = PopFunctionScopeInfo(&WP, BD, BlockTy);
BlockExpr *Result = new (Context) BlockExpr(BD, BlockTy);
// If the block isn't obviously global, i.e. it captures anything at
// all, then we need to do a few things in the surrounding context:
if (Result->getBlockDecl()->hasCaptures()) {
// First, this expression has a new cleanup object.
ExprCleanupObjects.push_back(Result->getBlockDecl());
Cleanup.setExprNeedsCleanups(true);
// It also gets a branch-protected scope if any of the captured
// variables needs destruction.
for (const auto &CI : Result->getBlockDecl()->captures()) {
const VarDecl *var = CI.getVariable();
if (var->getType().isDestructedType() != QualType::DK_none) {
setFunctionHasBranchProtectedScope();
break;
}
}
}
if (getCurFunction())
getCurFunction()->addBlock(BD);
if (BD->isInvalidDecl())
return CreateRecoveryExpr(Result->getBeginLoc(), Result->getEndLoc(),
{Result}, Result->getType());
return Result;
}
ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
SourceLocation RPLoc) {
TypeSourceInfo *TInfo;
GetTypeFromParser(Ty, &TInfo);
return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
}
ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
Expr *E, TypeSourceInfo *TInfo,
SourceLocation RPLoc) {
Expr *OrigExpr = E;
bool IsMS = false;
// CUDA device code does not support varargs.
if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) {
if (const FunctionDecl *F = dyn_cast<FunctionDecl>(CurContext)) {
CUDAFunctionTarget T = IdentifyCUDATarget(F);
if (T == CFT_Global || T == CFT_Device || T == CFT_HostDevice)
return ExprError(Diag(E->getBeginLoc(), diag::err_va_arg_in_device));
}
}
// NVPTX does not support va_arg expression.
if (getLangOpts().OpenMP && getLangOpts().OpenMPIsTargetDevice &&
Context.getTargetInfo().getTriple().isNVPTX())
targetDiag(E->getBeginLoc(), diag::err_va_arg_in_device);
// It might be a __builtin_ms_va_list. (But don't ever mark a va_arg()
// as Microsoft ABI on an actual Microsoft platform, where
// __builtin_ms_va_list and __builtin_va_list are the same.)
if (!E->isTypeDependent() && Context.getTargetInfo().hasBuiltinMSVaList() &&
Context.getTargetInfo().getBuiltinVaListKind() != TargetInfo::CharPtrBuiltinVaList) {
QualType MSVaListType = Context.getBuiltinMSVaListType();
if (Context.hasSameType(MSVaListType, E->getType())) {
if (CheckForModifiableLvalue(E, BuiltinLoc, *this))
return ExprError();
IsMS = true;
}
}
// Get the va_list type
QualType VaListType = Context.getBuiltinVaListType();
if (!IsMS) {
if (VaListType->isArrayType()) {
// Deal with implicit array decay; for example, on x86-64,
// va_list is an array, but it's supposed to decay to
// a pointer for va_arg.
VaListType = Context.getArrayDecayedType(VaListType);
// Make sure the input expression also decays appropriately.
ExprResult Result = UsualUnaryConversions(E);
if (Result.isInvalid())
return ExprError();
E = Result.get();
} else if (VaListType->isRecordType() && getLangOpts().CPlusPlus) {
// If va_list is a record type and we are compiling in C++ mode,
// check the argument using reference binding.
InitializedEntity Entity = InitializedEntity::InitializeParameter(
Context, Context.getLValueReferenceType(VaListType), false);
ExprResult Init = PerformCopyInitialization(Entity, SourceLocation(), E);
if (Init.isInvalid())
return ExprError();
E = Init.getAs<Expr>();
} else {
// Otherwise, the va_list argument must be an l-value because
// it is modified by va_arg.
if (!E->isTypeDependent() &&
CheckForModifiableLvalue(E, BuiltinLoc, *this))
return ExprError();
}
}
if (!IsMS && !E->isTypeDependent() &&
!Context.hasSameType(VaListType, E->getType()))
return ExprError(
Diag(E->getBeginLoc(),
diag::err_first_argument_to_va_arg_not_of_type_va_list)
<< OrigExpr->getType() << E->getSourceRange());
if (!TInfo->getType()->isDependentType()) {
if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
diag::err_second_parameter_to_va_arg_incomplete,
TInfo->getTypeLoc()))
return ExprError();
if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
TInfo->getType(),
diag::err_second_parameter_to_va_arg_abstract,
TInfo->getTypeLoc()))
return ExprError();
if (!TInfo->getType().isPODType(Context)) {
Diag(TInfo->getTypeLoc().getBeginLoc(),
TInfo->getType()->isObjCLifetimeType()
? diag::warn_second_parameter_to_va_arg_ownership_qualified
: diag::warn_second_parameter_to_va_arg_not_pod)
<< TInfo->getType()
<< TInfo->getTypeLoc().getSourceRange();
}
// Check for va_arg where arguments of the given type will be promoted
// (i.e. this va_arg is guaranteed to have undefined behavior).
QualType PromoteType;
if (Context.isPromotableIntegerType(TInfo->getType())) {
PromoteType = Context.getPromotedIntegerType(TInfo->getType());
// [cstdarg.syn]p1 defers the C++ behavior to what the C standard says,
// and C23 7.16.1.1p2 says, in part:
// If type is not compatible with the type of the actual next argument
// (as promoted according to the default argument promotions), the
// behavior is undefined, except for the following cases:
// - both types are pointers to qualified or unqualified versions of
// compatible types;
// - one type is compatible with a signed integer type, the other
// type is compatible with the corresponding unsigned integer type,
// and the value is representable in both types;
// - one type is pointer to qualified or unqualified void and the
// other is a pointer to a qualified or unqualified character type;
// - or, the type of the next argument is nullptr_t and type is a
// pointer type that has the same representation and alignment
// requirements as a pointer to a character type.
// Given that type compatibility is the primary requirement (ignoring
// qualifications), you would think we could call typesAreCompatible()
// directly to test this. However, in C++, that checks for *same type*,
// which causes false positives when passing an enumeration type to
// va_arg. Instead, get the underlying type of the enumeration and pass
// that.
QualType UnderlyingType = TInfo->getType();
if (const auto *ET = UnderlyingType->getAs<EnumType>())
UnderlyingType = ET->getDecl()->getIntegerType();
if (Context.typesAreCompatible(PromoteType, UnderlyingType,
/*CompareUnqualified*/ true))
PromoteType = QualType();
// If the types are still not compatible, we need to test whether the
// promoted type and the underlying type are the same except for
// signedness. Ask the AST for the correctly corresponding type and see
// if that's compatible.
if (!PromoteType.isNull() && !UnderlyingType->isBooleanType() &&
PromoteType->isUnsignedIntegerType() !=
UnderlyingType->isUnsignedIntegerType()) {
UnderlyingType =
UnderlyingType->isUnsignedIntegerType()
? Context.getCorrespondingSignedType(UnderlyingType)
: Context.getCorrespondingUnsignedType(UnderlyingType);
if (Context.typesAreCompatible(PromoteType, UnderlyingType,
/*CompareUnqualified*/ true))
PromoteType = QualType();
}
}
if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
PromoteType = Context.DoubleTy;
if (!PromoteType.isNull())
DiagRuntimeBehavior(TInfo->getTypeLoc().getBeginLoc(), E,
PDiag(diag::warn_second_parameter_to_va_arg_never_compatible)
<< TInfo->getType()
<< PromoteType
<< TInfo->getTypeLoc().getSourceRange());
}
QualType T = TInfo->getType().getNonLValueExprType(Context);
return new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T, IsMS);
}
ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
// The type of __null will be int or long, depending on the size of
// pointers on the target.
QualType Ty;
unsigned pw = Context.getTargetInfo().getPointerWidth(LangAS::Default);
if (pw == Context.getTargetInfo().getIntWidth())
Ty = Context.IntTy;
else if (pw == Context.getTargetInfo().getLongWidth())
Ty = Context.LongTy;
else if (pw == Context.getTargetInfo().getLongLongWidth())
Ty = Context.LongLongTy;
else {
llvm_unreachable("I don't know size of pointer!");
}
return new (Context) GNUNullExpr(Ty, TokenLoc);
}
static CXXRecordDecl *LookupStdSourceLocationImpl(Sema &S, SourceLocation Loc) {
CXXRecordDecl *ImplDecl = nullptr;
// Fetch the std::source_location::__impl decl.
if (NamespaceDecl *Std = S.getStdNamespace()) {
LookupResult ResultSL(S, &S.PP.getIdentifierTable().get("source_location"),
Loc, Sema::LookupOrdinaryName);
if (S.LookupQualifiedName(ResultSL, Std)) {
if (auto *SLDecl = ResultSL.getAsSingle<RecordDecl>()) {
LookupResult ResultImpl(S, &S.PP.getIdentifierTable().get("__impl"),
Loc, Sema::LookupOrdinaryName);
if ((SLDecl->isCompleteDefinition() || SLDecl->isBeingDefined()) &&
S.LookupQualifiedName(ResultImpl, SLDecl)) {
ImplDecl = ResultImpl.getAsSingle<CXXRecordDecl>();
}
}
}
}
if (!ImplDecl || !ImplDecl->isCompleteDefinition()) {
S.Diag(Loc, diag::err_std_source_location_impl_not_found);
return nullptr;
}
// Verify that __impl is a trivial struct type, with no base classes, and with
// only the four expected fields.
if (ImplDecl->isUnion() || !ImplDecl->isStandardLayout() ||
ImplDecl->getNumBases() != 0) {
S.Diag(Loc, diag::err_std_source_location_impl_malformed);
return nullptr;
}
unsigned Count = 0;
for (FieldDecl *F : ImplDecl->fields()) {
StringRef Name = F->getName();
if (Name == "_M_file_name") {
if (F->getType() !=
S.Context.getPointerType(S.Context.CharTy.withConst()))
break;
Count++;
} else if (Name == "_M_function_name") {
if (F->getType() !=
S.Context.getPointerType(S.Context.CharTy.withConst()))
break;
Count++;
} else if (Name == "_M_line") {
if (!F->getType()->isIntegerType())
break;
Count++;
} else if (Name == "_M_column") {
if (!F->getType()->isIntegerType())
break;
Count++;
} else {
Count = 100; // invalid
break;
}
}
if (Count != 4) {
S.Diag(Loc, diag::err_std_source_location_impl_malformed);
return nullptr;
}
return ImplDecl;
}
ExprResult Sema::ActOnSourceLocExpr(SourceLocIdentKind Kind,
SourceLocation BuiltinLoc,
SourceLocation RPLoc) {
QualType ResultTy;
switch (Kind) {
case SourceLocIdentKind::File:
case SourceLocIdentKind::FileName:
case SourceLocIdentKind::Function:
case SourceLocIdentKind::FuncSig: {
QualType ArrTy = Context.getStringLiteralArrayType(Context.CharTy, 0);
ResultTy =
Context.getPointerType(ArrTy->getAsArrayTypeUnsafe()->getElementType());
break;
}
case SourceLocIdentKind::Line:
case SourceLocIdentKind::Column:
ResultTy = Context.UnsignedIntTy;
break;
case SourceLocIdentKind::SourceLocStruct:
if (!StdSourceLocationImplDecl) {
StdSourceLocationImplDecl =
LookupStdSourceLocationImpl(*this, BuiltinLoc);
if (!StdSourceLocationImplDecl)
return ExprError();
}
ResultTy = Context.getPointerType(
Context.getRecordType(StdSourceLocationImplDecl).withConst());
break;
}
return BuildSourceLocExpr(Kind, ResultTy, BuiltinLoc, RPLoc, CurContext);
}
ExprResult Sema::BuildSourceLocExpr(SourceLocIdentKind Kind, QualType ResultTy,
SourceLocation BuiltinLoc,
SourceLocation RPLoc,
DeclContext *ParentContext) {
return new (Context)
SourceLocExpr(Context, Kind, ResultTy, BuiltinLoc, RPLoc, ParentContext);
}
bool Sema::CheckConversionToObjCLiteral(QualType DstType, Expr *&Exp,
bool Diagnose) {
if (!getLangOpts().ObjC)
return false;
const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
if (!PT)
return false;
const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
// Ignore any parens, implicit casts (should only be
// array-to-pointer decays), and not-so-opaque values. The last is
// important for making this trigger for property assignments.
Expr *SrcExpr = Exp->IgnoreParenImpCasts();
if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
if (OV->getSourceExpr())
SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();
if (auto *SL = dyn_cast<StringLiteral>(SrcExpr)) {
if (!PT->isObjCIdType() &&
!(ID && ID->getIdentifier()->isStr("NSString")))
return false;
if (!SL->isOrdinary())
return false;
if (Diagnose) {
Diag(SL->getBeginLoc(), diag::err_missing_atsign_prefix)
<< /*string*/0 << FixItHint::CreateInsertion(SL->getBeginLoc(), "@");
Exp = BuildObjCStringLiteral(SL->getBeginLoc(), SL).get();
}
return true;
}
if ((isa<IntegerLiteral>(SrcExpr) || isa<CharacterLiteral>(SrcExpr) ||
isa<FloatingLiteral>(SrcExpr) || isa<ObjCBoolLiteralExpr>(SrcExpr) ||
isa<CXXBoolLiteralExpr>(SrcExpr)) &&
!SrcExpr->isNullPointerConstant(
getASTContext(), Expr::NPC_NeverValueDependent)) {
if (!ID || !ID->getIdentifier()->isStr("NSNumber"))
return false;
if (Diagnose) {
Diag(SrcExpr->getBeginLoc(), diag::err_missing_atsign_prefix)
<< /*number*/1
<< FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "@");
Expr *NumLit =
BuildObjCNumericLiteral(SrcExpr->getBeginLoc(), SrcExpr).get();
if (NumLit)
Exp = NumLit;
}
return true;
}
return false;
}
static bool maybeDiagnoseAssignmentToFunction(Sema &S, QualType DstType,
const Expr *SrcExpr) {
if (!DstType->isFunctionPointerType() ||
!SrcExpr->getType()->isFunctionType())
return false;
auto *DRE = dyn_cast<DeclRefExpr>(SrcExpr->IgnoreParenImpCasts());
if (!DRE)
return false;
auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
if (!FD)
return false;
return !S.checkAddressOfFunctionIsAvailable(FD,
/*Complain=*/true,
SrcExpr->getBeginLoc());
}
bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
SourceLocation Loc,
QualType DstType, QualType SrcType,
Expr *SrcExpr, AssignmentAction Action,
bool *Complained) {
if (Complained)
*Complained = false;
// Decode the result (notice that AST's are still created for extensions).
bool CheckInferredResultType = false;
bool isInvalid = false;
unsigned DiagKind = 0;
ConversionFixItGenerator ConvHints;
bool MayHaveConvFixit = false;
bool MayHaveFunctionDiff = false;
const ObjCInterfaceDecl *IFace = nullptr;
const ObjCProtocolDecl *PDecl = nullptr;
switch (ConvTy) {
case Compatible:
DiagnoseAssignmentEnum(DstType, SrcType, SrcExpr);
return false;
case PointerToInt:
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_pointer_int;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_pointer_int;
}
ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
MayHaveConvFixit = true;
break;
case IntToPointer:
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_int_pointer;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_int_pointer;
}
ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
MayHaveConvFixit = true;
break;
case IncompatibleFunctionPointerStrict:
DiagKind =
diag::warn_typecheck_convert_incompatible_function_pointer_strict;
ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
MayHaveConvFixit = true;
break;
case IncompatibleFunctionPointer:
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_incompatible_function_pointer;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_incompatible_function_pointer;
}
ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
MayHaveConvFixit = true;
break;
case IncompatiblePointer:
if (Action == AA_Passing_CFAudited) {
DiagKind = diag::err_arc_typecheck_convert_incompatible_pointer;
} else if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_incompatible_pointer;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
}
CheckInferredResultType = DstType->isObjCObjectPointerType() &&
SrcType->isObjCObjectPointerType();
if (!CheckInferredResultType) {
ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
} else if (CheckInferredResultType) {
SrcType = SrcType.getUnqualifiedType();
DstType = DstType.getUnqualifiedType();
}
MayHaveConvFixit = true;
break;
case IncompatiblePointerSign:
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_incompatible_pointer_sign;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
}
break;
case FunctionVoidPointer:
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_pointer_void_func;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_pointer_void_func;
}
break;
case IncompatiblePointerDiscardsQualifiers: {
// Perform array-to-pointer decay if necessary.
if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
isInvalid = true;
Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
Qualifiers rhq = DstType->getPointeeType().getQualifiers();
if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
DiagKind = diag::err_typecheck_incompatible_address_space;
break;
} else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
DiagKind = diag::err_typecheck_incompatible_ownership;
break;
}
llvm_unreachable("unknown error case for discarding qualifiers!");
// fallthrough
}
case CompatiblePointerDiscardsQualifiers:
// If the qualifiers lost were because we were applying the
// (deprecated) C++ conversion from a string literal to a char*
// (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
// Ideally, this check would be performed in
// checkPointerTypesForAssignment. However, that would require a
// bit of refactoring (so that the second argument is an
// expression, rather than a type), which should be done as part
// of a larger effort to fix checkPointerTypesForAssignment for
// C++ semantics.
if (getLangOpts().CPlusPlus &&
IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
return false;
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_typecheck_convert_discards_qualifiers;
isInvalid = true;
} else {
DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
}
break;
case IncompatibleNestedPointerQualifiers:
if (getLangOpts().CPlusPlus) {
isInvalid = true;
DiagKind = diag::err_nested_pointer_qualifier_mismatch;
} else {
DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
}
break;
case IncompatibleNestedPointerAddressSpaceMismatch:
DiagKind = diag::err_typecheck_incompatible_nested_address_space;
isInvalid = true;
break;
case IntToBlockPointer:
DiagKind = diag::err_int_to_block_pointer;
isInvalid = true;
break;
case IncompatibleBlockPointer:
DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
isInvalid = true;
break;
case IncompatibleObjCQualifiedId: {
if (SrcType->isObjCQualifiedIdType()) {
const ObjCObjectPointerType *srcOPT =
SrcType->castAs<ObjCObjectPointerType>();
for (auto *srcProto : srcOPT->quals()) {
PDecl = srcProto;
break;
}
if (const ObjCInterfaceType *IFaceT =
DstType->castAs<ObjCObjectPointerType>()->getInterfaceType())
IFace = IFaceT->getDecl();
}
else if (DstType->isObjCQualifiedIdType()) {
const ObjCObjectPointerType *dstOPT =
DstType->castAs<ObjCObjectPointerType>();
for (auto *dstProto : dstOPT->quals()) {
PDecl = dstProto;
break;
}
if (const ObjCInterfaceType *IFaceT =
SrcType->castAs<ObjCObjectPointerType>()->getInterfaceType())
IFace = IFaceT->getDecl();
}
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_incompatible_qualified_id;
isInvalid = true;
} else {
DiagKind = diag::warn_incompatible_qualified_id;
}
break;
}
case IncompatibleVectors:
if (getLangOpts().CPlusPlus) {
DiagKind = diag::err_incompatible_vectors;
isInvalid = true;
} else {
DiagKind = diag::warn_incompatible_vectors;
}
break;
case IncompatibleObjCWeakRef:
DiagKind = diag::err_arc_weak_unavailable_assign;
isInvalid = true;
break;
case Incompatible:
if (maybeDiagnoseAssignmentToFunction(*this, DstType, SrcExpr)) {
if (Complained)
*Complained = true;
return true;
}
DiagKind = diag::err_typecheck_convert_incompatible;
ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
MayHaveConvFixit = true;
isInvalid = true;
MayHaveFunctionDiff = true;
break;
}
QualType FirstType, SecondType;
switch (Action) {
case AA_Assigning:
case AA_Initializing:
// The destination type comes first.
FirstType = DstType;
SecondType = SrcType;
break;
case AA_Returning:
case AA_Passing:
case AA_Passing_CFAudited:
case AA_Converting:
case AA_Sending:
case AA_Casting:
// The source type comes first.
FirstType = SrcType;
SecondType = DstType;
break;
}
PartialDiagnostic FDiag = PDiag(DiagKind);
AssignmentAction ActionForDiag = Action;
if (Action == AA_Passing_CFAudited)
ActionForDiag = AA_Passing;
FDiag << FirstType << SecondType << ActionForDiag
<< SrcExpr->getSourceRange();
if (DiagKind == diag::ext_typecheck_convert_incompatible_pointer_sign ||
DiagKind == diag::err_typecheck_convert_incompatible_pointer_sign) {
auto isPlainChar = [](const clang::Type *Type) {
return Type->isSpecificBuiltinType(BuiltinType::Char_S) ||
Type->isSpecificBuiltinType(BuiltinType::Char_U);
};
FDiag << (isPlainChar(FirstType->getPointeeOrArrayElementType()) ||
isPlainChar(SecondType->getPointeeOrArrayElementType()));
}
// If we can fix the conversion, suggest the FixIts.
if (!ConvHints.isNull()) {
for (FixItHint &H : ConvHints.Hints)
FDiag << H;
}
if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
if (MayHaveFunctionDiff)
HandleFunctionTypeMismatch(FDiag, SecondType, FirstType);
Diag(Loc, FDiag);
if ((DiagKind == diag::warn_incompatible_qualified_id ||
DiagKind == diag::err_incompatible_qualified_id) &&
PDecl && IFace && !IFace->hasDefinition())
Diag(IFace->getLocation(), diag::note_incomplete_class_and_qualified_id)
<< IFace << PDecl;
if (SecondType == Context.OverloadTy)
NoteAllOverloadCandidates(OverloadExpr::find(SrcExpr).Expression,
FirstType, /*TakingAddress=*/true);
if (CheckInferredResultType)
EmitRelatedResultTypeNote(SrcExpr);
if (Action == AA_Returning && ConvTy == IncompatiblePointer)
EmitRelatedResultTypeNoteForReturn(DstType);
if (Complained)
*Complained = true;
return isInvalid;
}
ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
llvm::APSInt *Result,
AllowFoldKind CanFold) {
class SimpleICEDiagnoser : public VerifyICEDiagnoser {
public:
SemaDiagnosticBuilder diagnoseNotICEType(Sema &S, SourceLocation Loc,
QualType T) override {
return S.Diag(Loc, diag::err_ice_not_integral)
<< T << S.LangOpts.CPlusPlus;
}
SemaDiagnosticBuilder diagnoseNotICE(Sema &S, SourceLocation Loc) override {
return S.Diag(Loc, diag::err_expr_not_ice) << S.LangOpts.CPlusPlus;
}
} Diagnoser;
return VerifyIntegerConstantExpression(E, Result, Diagnoser, CanFold);
}
ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
llvm::APSInt *Result,
unsigned DiagID,
AllowFoldKind CanFold) {
class IDDiagnoser : public VerifyICEDiagnoser {
unsigned DiagID;
public:
IDDiagnoser(unsigned DiagID)
: VerifyICEDiagnoser(DiagID == 0), DiagID(DiagID) { }
SemaDiagnosticBuilder diagnoseNotICE(Sema &S, SourceLocation Loc) override {
return S.Diag(Loc, DiagID);
}
} Diagnoser(DiagID);
return VerifyIntegerConstantExpression(E, Result, Diagnoser, CanFold);
}
Sema::SemaDiagnosticBuilder
Sema::VerifyICEDiagnoser::diagnoseNotICEType(Sema &S, SourceLocation Loc,
QualType T) {
return diagnoseNotICE(S, Loc);
}
Sema::SemaDiagnosticBuilder
Sema::VerifyICEDiagnoser::diagnoseFold(Sema &S, SourceLocation Loc) {
return S.Diag(Loc, diag::ext_expr_not_ice) << S.LangOpts.CPlusPlus;
}
ExprResult
Sema::VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
VerifyICEDiagnoser &Diagnoser,
AllowFoldKind CanFold) {
SourceLocation DiagLoc = E->getBeginLoc();
if (getLangOpts().CPlusPlus11) {
// C++11 [expr.const]p5:
// If an expression of literal class type is used in a context where an
// integral constant expression is required, then that class type shall
// have a single non-explicit conversion function to an integral or
// unscoped enumeration type
ExprResult Converted;
class CXX11ConvertDiagnoser : public ICEConvertDiagnoser {
VerifyICEDiagnoser &BaseDiagnoser;
public:
CXX11ConvertDiagnoser(VerifyICEDiagnoser &BaseDiagnoser)
: ICEConvertDiagnoser(/*AllowScopedEnumerations*/ false,
BaseDiagnoser.Suppress, true),
BaseDiagnoser(BaseDiagnoser) {}
SemaDiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
QualType T) override {
return BaseDiagnoser.diagnoseNotICEType(S, Loc, T);
}
SemaDiagnosticBuilder diagnoseIncomplete(
Sema &S, SourceLocation Loc, QualType T) override {
return S.Diag(Loc, diag::err_ice_incomplete_type) << T;
}
SemaDiagnosticBuilder diagnoseExplicitConv(
Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
return S.Diag(Loc, diag::err_ice_explicit_conversion) << T << ConvTy;
}
SemaDiagnosticBuilder noteExplicitConv(
Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
<< ConvTy->isEnumeralType() << ConvTy;
}
SemaDiagnosticBuilder diagnoseAmbiguous(
Sema &S, SourceLocation Loc, QualType T) override {
return S.Diag(Loc, diag::err_ice_ambiguous_conversion) << T;
}
SemaDiagnosticBuilder noteAmbiguous(
Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
<< ConvTy->isEnumeralType() << ConvTy;
}
SemaDiagnosticBuilder diagnoseConversion(
Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
llvm_unreachable("conversion functions are permitted");
}
} ConvertDiagnoser(Diagnoser);
Converted = PerformContextualImplicitConversion(DiagLoc, E,
ConvertDiagnoser);
if (Converted.isInvalid())
return Converted;
E = Converted.get();
if (!E->getType()->isIntegralOrUnscopedEnumerationType())
return ExprError();
} else if (!E->getType()->isIntegralOrUnscopedEnumerationType()) {
// An ICE must be of integral or unscoped enumeration type.
if (!Diagnoser.Suppress)
Diagnoser.diagnoseNotICEType(*this, DiagLoc, E->getType())
<< E->getSourceRange();
return ExprError();
}
ExprResult RValueExpr = DefaultLvalueConversion(E);
if (RValueExpr.isInvalid())
return ExprError();
E = RValueExpr.get();
// Circumvent ICE checking in C++11 to avoid evaluating the expression twice
// in the non-ICE case.
if (!getLangOpts().CPlusPlus11 && E->isIntegerConstantExpr(Context)) {
if (Result)
*Result = E->EvaluateKnownConstIntCheckOverflow(Context);
if (!isa<ConstantExpr>(E))
E = Result ? ConstantExpr::Create(Context, E, APValue(*Result))
: ConstantExpr::Create(Context, E);
return E;
}
Expr::EvalResult EvalResult;
SmallVector<PartialDiagnosticAt, 8> Notes;
EvalResult.Diag = &Notes;
// Try to evaluate the expression, and produce diagnostics explaining why it's
// not a constant expression as a side-effect.
bool Folded =
E->EvaluateAsRValue(EvalResult, Context, /*isConstantContext*/ true) &&
EvalResult.Val.isInt() && !EvalResult.HasSideEffects;
if (!isa<ConstantExpr>(E))
E = ConstantExpr::Create(Context, E, EvalResult.Val);
// In C++11, we can rely on diagnostics being produced for any expression
// which is not a constant expression. If no diagnostics were produced, then
// this is a constant expression.
if (Folded && getLangOpts().CPlusPlus11 && Notes.empty()) {
if (Result)
*Result = EvalResult.Val.getInt();
return E;
}
// If our only note is the usual "invalid subexpression" note, just point
// the caret at its location rather than producing an essentially
// redundant note.
if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
diag::note_invalid_subexpr_in_const_expr) {
DiagLoc = Notes[0].first;
Notes.clear();
}
if (!Folded || !CanFold) {
if (!Diagnoser.Suppress) {
Diagnoser.diagnoseNotICE(*this, DiagLoc) << E->getSourceRange();
for (const PartialDiagnosticAt &Note : Notes)
Diag(Note.first, Note.second);
}
return ExprError();
}
Diagnoser.diagnoseFold(*this, DiagLoc) << E->getSourceRange();
for (const PartialDiagnosticAt &Note : Notes)
Diag(Note.first, Note.second);
if (Result)
*Result = EvalResult.Val.getInt();
return E;
}
namespace {
// Handle the case where we conclude a expression which we speculatively
// considered to be unevaluated is actually evaluated.
class TransformToPE : public TreeTransform<TransformToPE> {
typedef TreeTransform<TransformToPE> BaseTransform;
public:
TransformToPE(Sema &SemaRef) : BaseTransform(SemaRef) { }
// Make sure we redo semantic analysis
bool AlwaysRebuild() { return true; }
bool ReplacingOriginal() { return true; }
// We need to special-case DeclRefExprs referring to FieldDecls which
// are not part of a member pointer formation; normal TreeTransforming
// doesn't catch this case because of the way we represent them in the AST.
// FIXME: This is a bit ugly; is it really the best way to handle this
// case?
//
// Error on DeclRefExprs referring to FieldDecls.
ExprResult TransformDeclRefExpr(DeclRefExpr *E) {
if (isa<FieldDecl>(E->getDecl()) &&
!SemaRef.isUnevaluatedContext())
return SemaRef.Diag(E->getLocation(),
diag::err_invalid_non_static_member_use)
<< E->getDecl() << E->getSourceRange();
return BaseTransform::TransformDeclRefExpr(E);
}
// Exception: filter out member pointer formation
ExprResult TransformUnaryOperator(UnaryOperator *E) {
if (E->getOpcode() == UO_AddrOf && E->getType()->isMemberPointerType())
return E;
return BaseTransform::TransformUnaryOperator(E);
}
// The body of a lambda-expression is in a separate expression evaluation
// context so never needs to be transformed.
// FIXME: Ideally we wouldn't transform the closure type either, and would
// just recreate the capture expressions and lambda expression.
StmtResult TransformLambdaBody(LambdaExpr *E, Stmt *Body) {
return SkipLambdaBody(E, Body);
}
};
}
ExprResult Sema::TransformToPotentiallyEvaluated(Expr *E) {
assert(isUnevaluatedContext() &&
"Should only transform unevaluated expressions");
ExprEvalContexts.back().Context =
ExprEvalContexts[ExprEvalContexts.size()-2].Context;
if (isUnevaluatedContext())
return E;
return TransformToPE(*this).TransformExpr(E);
}
TypeSourceInfo *Sema::TransformToPotentiallyEvaluated(TypeSourceInfo *TInfo) {
assert(isUnevaluatedContext() &&
"Should only transform unevaluated expressions");
ExprEvalContexts.back().Context =
ExprEvalContexts[ExprEvalContexts.size() - 2].Context;
if (isUnevaluatedContext())
return TInfo;
return TransformToPE(*this).TransformType(TInfo);
}
void
Sema::PushExpressionEvaluationContext(
ExpressionEvaluationContext NewContext, Decl *LambdaContextDecl,
ExpressionEvaluationContextRecord::ExpressionKind ExprContext) {
ExprEvalContexts.emplace_back(NewContext, ExprCleanupObjects.size(), Cleanup,
LambdaContextDecl, ExprContext);
// Discarded statements and immediate contexts nested in other
// discarded statements or immediate context are themselves
// a discarded statement or an immediate context, respectively.
ExprEvalContexts.back().InDiscardedStatement =
ExprEvalContexts[ExprEvalContexts.size() - 2]
.isDiscardedStatementContext();
// C++23 [expr.const]/p15
// An expression or conversion is in an immediate function context if [...]
// it is a subexpression of a manifestly constant-evaluated expression or
// conversion.
const auto &Prev = ExprEvalContexts[ExprEvalContexts.size() - 2];
ExprEvalContexts.back().InImmediateFunctionContext =
Prev.isImmediateFunctionContext() || Prev.isConstantEvaluated();
ExprEvalContexts.back().InImmediateEscalatingFunctionContext =
Prev.InImmediateEscalatingFunctionContext;
Cleanup.reset();
if (!MaybeODRUseExprs.empty())
std::swap(MaybeODRUseExprs, ExprEvalContexts.back().SavedMaybeODRUseExprs);
}
void
Sema::PushExpressionEvaluationContext(
ExpressionEvaluationContext NewContext, ReuseLambdaContextDecl_t,
ExpressionEvaluationContextRecord::ExpressionKind ExprContext) {
Decl *ClosureContextDecl = ExprEvalContexts.back().ManglingContextDecl;
PushExpressionEvaluationContext(NewContext, ClosureContextDecl, ExprContext);
}
namespace {
const DeclRefExpr *CheckPossibleDeref(Sema &S, const Expr *PossibleDeref) {
PossibleDeref = PossibleDeref->IgnoreParenImpCasts();
if (const auto *E = dyn_cast<UnaryOperator>(PossibleDeref)) {
if (E->getOpcode() == UO_Deref)
return CheckPossibleDeref(S, E->getSubExpr());
} else if (const auto *E = dyn_cast<ArraySubscriptExpr>(PossibleDeref)) {
return CheckPossibleDeref(S, E->getBase());
} else if (const auto *E = dyn_cast<MemberExpr>(PossibleDeref)) {
return CheckPossibleDeref(S, E->getBase());
} else if (const auto E = dyn_cast<DeclRefExpr>(PossibleDeref)) {
QualType Inner;
QualType Ty = E->getType();
if (const auto *Ptr = Ty->getAs<PointerType>())
Inner = Ptr->getPointeeType();
else if (const auto *Arr = S.Context.getAsArrayType(Ty))
Inner = Arr->getElementType();
else
return nullptr;
if (Inner->hasAttr(attr::NoDeref))
return E;
}
return nullptr;
}
} // namespace
void Sema::WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec) {
for (const Expr *E : Rec.PossibleDerefs) {
const DeclRefExpr *DeclRef = CheckPossibleDeref(*this, E);
if (DeclRef) {
const ValueDecl *Decl = DeclRef->getDecl();
Diag(E->getExprLoc(), diag::warn_dereference_of_noderef_type)
<< Decl->getName() << E->getSourceRange();
Diag(Decl->getLocation(), diag::note_previous_decl) << Decl->getName();
} else {
Diag(E->getExprLoc(), diag::warn_dereference_of_noderef_type_no_decl)
<< E->getSourceRange();
}
}
Rec.PossibleDerefs.clear();
}
/// Check whether E, which is either a discarded-value expression or an
/// unevaluated operand, is a simple-assignment to a volatlie-qualified lvalue,
/// and if so, remove it from the list of volatile-qualified assignments that
/// we are going to warn are deprecated.
void Sema::CheckUnusedVolatileAssignment(Expr *E) {
if (!E->getType().isVolatileQualified() || !getLangOpts().CPlusPlus20)
return;
// Note: ignoring parens here is not justified by the standard rules, but
// ignoring parentheses seems like a more reasonable approach, and this only
// drives a deprecation warning so doesn't affect conformance.
if (auto *BO = dyn_cast<BinaryOperator>(E->IgnoreParenImpCasts())) {
if (BO->getOpcode() == BO_Assign) {
auto &LHSs = ExprEvalContexts.back().VolatileAssignmentLHSs;
llvm::erase(LHSs, BO->getLHS());
}
}
}
void Sema::MarkExpressionAsImmediateEscalating(Expr *E) {
assert(getLangOpts().CPlusPlus20 &&
ExprEvalContexts.back().InImmediateEscalatingFunctionContext &&
"Cannot mark an immediate escalating expression outside of an "
"immediate escalating context");
if (auto *Call = dyn_cast<CallExpr>(E->IgnoreImplicit());
Call && Call->getCallee()) {
if (auto *DeclRef =
dyn_cast<DeclRefExpr>(Call->getCallee()->IgnoreImplicit()))
DeclRef->setIsImmediateEscalating(true);
} else if (auto *Ctr = dyn_cast<CXXConstructExpr>(E->IgnoreImplicit())) {
Ctr->setIsImmediateEscalating(true);
} else if (auto *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreImplicit())) {
DeclRef->setIsImmediateEscalating(true);
} else {
assert(false && "expected an immediately escalating expression");
}
if (FunctionScopeInfo *FI = getCurFunction())
FI->FoundImmediateEscalatingExpression = true;
}
ExprResult Sema::CheckForImmediateInvocation(ExprResult E, FunctionDecl *Decl) {
if (isUnevaluatedContext() || !E.isUsable() || !Decl ||
!Decl->isImmediateFunction() || isAlwaysConstantEvaluatedContext() ||
isCheckingDefaultArgumentOrInitializer() ||
RebuildingImmediateInvocation || isImmediateFunctionContext())
return E;
/// Opportunistically remove the callee from ReferencesToConsteval if we can.
/// It's OK if this fails; we'll also remove this in
/// HandleImmediateInvocations, but catching it here allows us to avoid
/// walking the AST looking for it in simple cases.
if (auto *Call = dyn_cast<CallExpr>(E.get()->IgnoreImplicit()))
if (auto *DeclRef =
dyn_cast<DeclRefExpr>(Call->getCallee()->IgnoreImplicit()))
ExprEvalContexts.back().ReferenceToConsteval.erase(DeclRef);
// C++23 [expr.const]/p16
// An expression or conversion is immediate-escalating if it is not initially
// in an immediate function context and it is [...] an immediate invocation
// that is not a constant expression and is not a subexpression of an
// immediate invocation.
APValue Cached;
auto CheckConstantExpressionAndKeepResult = [&]() {
llvm::SmallVector<PartialDiagnosticAt, 8> Notes;
Expr::EvalResult Eval;
Eval.Diag = &Notes;
bool Res = E.get()->EvaluateAsConstantExpr(
Eval, getASTContext(), ConstantExprKind::ImmediateInvocation);
if (Res && Notes.empty()) {
Cached = std::move(Eval.Val);
return true;
}
return false;
};
if (!E.get()->isValueDependent() &&
ExprEvalContexts.back().InImmediateEscalatingFunctionContext &&
!CheckConstantExpressionAndKeepResult()) {
MarkExpressionAsImmediateEscalating(E.get());
return E;
}
if (Cleanup.exprNeedsCleanups()) {
// Since an immediate invocation is a full expression itself - it requires
// an additional ExprWithCleanups node, but it can participate to a bigger
// full expression which actually requires cleanups to be run after so
// create ExprWithCleanups without using MaybeCreateExprWithCleanups as it
// may discard cleanups for outer expression too early.
// Note that ExprWithCleanups created here must always have empty cleanup
// objects:
// - compound literals do not create cleanup objects in C++ and immediate
// invocations are C++-only.
// - blocks are not allowed inside constant expressions and compiler will
// issue an error if they appear there.
//
// Hence, in correct code any cleanup objects created inside current
// evaluation context must be outside the immediate invocation.
E = ExprWithCleanups::Create(getASTContext(), E.get(),
Cleanup.cleanupsHaveSideEffects(), {});
}
ConstantExpr *Res = ConstantExpr::Create(
getASTContext(), E.get(),
ConstantExpr::getStorageKind(Decl->getReturnType().getTypePtr(),
getASTContext()),
/*IsImmediateInvocation*/ true);
if (Cached.hasValue())
Res->MoveIntoResult(Cached, getASTContext());
/// Value-dependent constant expressions should not be immediately
/// evaluated until they are instantiated.
if (!Res->isValueDependent())
ExprEvalContexts.back().ImmediateInvocationCandidates.emplace_back(Res, 0);
return Res;
}
static void EvaluateAndDiagnoseImmediateInvocation(
Sema &SemaRef, Sema::ImmediateInvocationCandidate Candidate) {
llvm::SmallVector<PartialDiagnosticAt, 8> Notes;
Expr::EvalResult Eval;
Eval.Diag = &Notes;
ConstantExpr *CE = Candidate.getPointer();
bool Result = CE->EvaluateAsConstantExpr(
Eval, SemaRef.getASTContext(), ConstantExprKind::ImmediateInvocation);
if (!Result || !Notes.empty()) {
SemaRef.FailedImmediateInvocations.insert(CE);
Expr *InnerExpr = CE->getSubExpr()->IgnoreImplicit();
if (auto *FunctionalCast = dyn_cast<CXXFunctionalCastExpr>(InnerExpr))
InnerExpr = FunctionalCast->getSubExpr()->IgnoreImplicit();
FunctionDecl *FD = nullptr;
if (auto *Call = dyn_cast<CallExpr>(InnerExpr))
FD = cast<FunctionDecl>(Call->getCalleeDecl());
else if (auto *Call = dyn_cast<CXXConstructExpr>(InnerExpr))
FD = Call->getConstructor();
else if (auto *Cast = dyn_cast<CastExpr>(InnerExpr))
FD = dyn_cast_or_null<FunctionDecl>(Cast->getConversionFunction());
assert(FD && FD->isImmediateFunction() &&
"could not find an immediate function in this expression");
if (FD->isInvalidDecl())
return;
SemaRef.Diag(CE->getBeginLoc(), diag::err_invalid_consteval_call)
<< FD << FD->isConsteval();
if (auto Context =
SemaRef.InnermostDeclarationWithDelayedImmediateInvocations()) {
SemaRef.Diag(Context->Loc, diag::note_invalid_consteval_initializer)
<< Context->Decl;
SemaRef.Diag(Context->Decl->getBeginLoc(), diag::note_declared_at);
}
if (!FD->isConsteval())
SemaRef.DiagnoseImmediateEscalatingReason(FD);
for (auto &Note : Notes)
SemaRef.Diag(Note.first, Note.second);
return;
}
CE->MoveIntoResult(Eval.Val, SemaRef.getASTContext());
}
static void RemoveNestedImmediateInvocation(
Sema &SemaRef, Sema::ExpressionEvaluationContextRecord &Rec,
SmallVector<Sema::ImmediateInvocationCandidate, 4>::reverse_iterator It) {
struct ComplexRemove : TreeTransform<ComplexRemove> {
using Base = TreeTransform<ComplexRemove>;
llvm::SmallPtrSetImpl<DeclRefExpr *> &DRSet;
SmallVector<Sema::ImmediateInvocationCandidate, 4> &IISet;
SmallVector<Sema::ImmediateInvocationCandidate, 4>::reverse_iterator
CurrentII;
ComplexRemove(Sema &SemaRef, llvm::SmallPtrSetImpl<DeclRefExpr *> &DR,
SmallVector<Sema::ImmediateInvocationCandidate, 4> &II,
SmallVector<Sema::ImmediateInvocationCandidate,
4>::reverse_iterator Current)
: Base(SemaRef), DRSet(DR), IISet(II), CurrentII(Current) {}
void RemoveImmediateInvocation(ConstantExpr* E) {
auto It = std::find_if(CurrentII, IISet.rend(),
[E](Sema::ImmediateInvocationCandidate Elem) {
return Elem.getPointer() == E;
});
// It is possible that some subexpression of the current immediate
// invocation was handled from another expression evaluation context. Do
// not handle the current immediate invocation if some of its
// subexpressions failed before.
if (It == IISet.rend()) {
if (SemaRef.FailedImmediateInvocations.contains(E))
CurrentII->setInt(1);
} else {
It->setInt(1); // Mark as deleted
}
}
ExprResult TransformConstantExpr(ConstantExpr *E) {
if (!E->isImmediateInvocation())
return Base::TransformConstantExpr(E);
RemoveImmediateInvocation(E);
return Base::TransformExpr(E->getSubExpr());
}
/// Base::TransfromCXXOperatorCallExpr doesn't traverse the callee so
/// we need to remove its DeclRefExpr from the DRSet.
ExprResult TransformCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
DRSet.erase(cast<DeclRefExpr>(E->getCallee()->IgnoreImplicit()));
return Base::TransformCXXOperatorCallExpr(E);
}
/// Base::TransformUserDefinedLiteral doesn't preserve the
/// UserDefinedLiteral node.
ExprResult TransformUserDefinedLiteral(UserDefinedLiteral *E) { return E; }
/// Base::TransformInitializer skips ConstantExpr so we need to visit them
/// here.
ExprResult TransformInitializer(Expr *Init, bool NotCopyInit) {
if (!Init)
return Init;
/// ConstantExpr are the first layer of implicit node to be removed so if
/// Init isn't a ConstantExpr, no ConstantExpr will be skipped.
if (auto *CE = dyn_cast<ConstantExpr>(Init))
if (CE->isImmediateInvocation())
RemoveImmediateInvocation(CE);
return Base::TransformInitializer(Init, NotCopyInit);
}
ExprResult TransformDeclRefExpr(DeclRefExpr *E) {
DRSet.erase(E);
return E;
}
ExprResult TransformLambdaExpr(LambdaExpr *E) {
// Do not rebuild lambdas to avoid creating a new type.
// Lambdas have already been processed inside their eval context.
return E;
}
bool AlwaysRebuild() { return false; }
bool ReplacingOriginal() { return true; }
bool AllowSkippingCXXConstructExpr() {
bool Res = AllowSkippingFirstCXXConstructExpr;
AllowSkippingFirstCXXConstructExpr = true;
return Res;
}
bool AllowSkippingFirstCXXConstructExpr = true;
} Transformer(SemaRef, Rec.ReferenceToConsteval,
Rec.ImmediateInvocationCandidates, It);
/// CXXConstructExpr with a single argument are getting skipped by
/// TreeTransform in some situtation because they could be implicit. This
/// can only occur for the top-level CXXConstructExpr because it is used
/// nowhere in the expression being transformed therefore will not be rebuilt.
/// Setting AllowSkippingFirstCXXConstructExpr to false will prevent from
/// skipping the first CXXConstructExpr.
if (isa<CXXConstructExpr>(It->getPointer()->IgnoreImplicit()))
Transformer.AllowSkippingFirstCXXConstructExpr = false;
ExprResult Res = Transformer.TransformExpr(It->getPointer()->getSubExpr());
// The result may not be usable in case of previous compilation errors.
// In this case evaluation of the expression may result in crash so just
// don't do anything further with the result.
if (Res.isUsable()) {
Res = SemaRef.MaybeCreateExprWithCleanups(Res);
It->getPointer()->setSubExpr(Res.get());
}
}
static void
HandleImmediateInvocations(Sema &SemaRef,
Sema::ExpressionEvaluationContextRecord &Rec) {
if ((Rec.ImmediateInvocationCandidates.size() == 0 &&
Rec.ReferenceToConsteval.size() == 0) ||
SemaRef.RebuildingImmediateInvocation)
return;
/// When we have more than 1 ImmediateInvocationCandidates or previously
/// failed immediate invocations, we need to check for nested
/// ImmediateInvocationCandidates in order to avoid duplicate diagnostics.
/// Otherwise we only need to remove ReferenceToConsteval in the immediate
/// invocation.
if (Rec.ImmediateInvocationCandidates.size() > 1 ||
!SemaRef.FailedImmediateInvocations.empty()) {
/// Prevent sema calls during the tree transform from adding pointers that
/// are already in the sets.
llvm::SaveAndRestore DisableIITracking(
SemaRef.RebuildingImmediateInvocation, true);
/// Prevent diagnostic during tree transfrom as they are duplicates
Sema::TentativeAnalysisScope DisableDiag(SemaRef);
for (auto It = Rec.ImmediateInvocationCandidates.rbegin();
It != Rec.ImmediateInvocationCandidates.rend(); It++)
if (!It->getInt())
RemoveNestedImmediateInvocation(SemaRef, Rec, It);
} else if (Rec.ImmediateInvocationCandidates.size() == 1 &&
Rec.ReferenceToConsteval.size()) {
struct SimpleRemove : RecursiveASTVisitor<SimpleRemove> {
llvm::SmallPtrSetImpl<DeclRefExpr *> &DRSet;
SimpleRemove(llvm::SmallPtrSetImpl<DeclRefExpr *> &S) : DRSet(S) {}
bool VisitDeclRefExpr(DeclRefExpr *E) {
DRSet.erase(E);
return DRSet.size();
}
} Visitor(Rec.ReferenceToConsteval);
Visitor.TraverseStmt(
Rec.ImmediateInvocationCandidates.front().getPointer()->getSubExpr());
}
for (auto CE : Rec.ImmediateInvocationCandidates)
if (!CE.getInt())
EvaluateAndDiagnoseImmediateInvocation(SemaRef, CE);
for (auto *DR : Rec.ReferenceToConsteval) {
// If the expression is immediate escalating, it is not an error;
// The outer context itself becomes immediate and further errors,
// if any, will be handled by DiagnoseImmediateEscalatingReason.
if (DR->isImmediateEscalating())
continue;
auto *FD = cast<FunctionDecl>(DR->getDecl());
const NamedDecl *ND = FD;
if (const auto *MD = dyn_cast<CXXMethodDecl>(ND);
MD && (MD->isLambdaStaticInvoker() || isLambdaCallOperator(MD)))
ND = MD->getParent();
// C++23 [expr.const]/p16
// An expression or conversion is immediate-escalating if it is not
// initially in an immediate function context and it is [...] a
// potentially-evaluated id-expression that denotes an immediate function
// that is not a subexpression of an immediate invocation.
bool ImmediateEscalating = false;
bool IsPotentiallyEvaluated =
Rec.Context ==
Sema::ExpressionEvaluationContext::PotentiallyEvaluated ||
Rec.Context ==
Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed;
if (SemaRef.inTemplateInstantiation() && IsPotentiallyEvaluated)
ImmediateEscalating = Rec.InImmediateEscalatingFunctionContext;
if (!Rec.InImmediateEscalatingFunctionContext ||
(SemaRef.inTemplateInstantiation() && !ImmediateEscalating)) {
SemaRef.Diag(DR->getBeginLoc(), diag::err_invalid_consteval_take_address)
<< ND << isa<CXXRecordDecl>(ND) << FD->isConsteval();
SemaRef.Diag(ND->getLocation(), diag::note_declared_at);
if (auto Context =
SemaRef.InnermostDeclarationWithDelayedImmediateInvocations()) {
SemaRef.Diag(Context->Loc, diag::note_invalid_consteval_initializer)
<< Context->Decl;
SemaRef.Diag(Context->Decl->getBeginLoc(), diag::note_declared_at);
}
if (FD->isImmediateEscalating() && !FD->isConsteval())
SemaRef.DiagnoseImmediateEscalatingReason(FD);
} else {
SemaRef.MarkExpressionAsImmediateEscalating(DR);
}
}
}
void Sema::PopExpressionEvaluationContext() {
ExpressionEvaluationContextRecord& Rec = ExprEvalContexts.back();
unsigned NumTypos = Rec.NumTypos;
if (!Rec.Lambdas.empty()) {
using ExpressionKind = ExpressionEvaluationContextRecord::ExpressionKind;
if (!getLangOpts().CPlusPlus20 &&
(Rec.ExprContext == ExpressionKind::EK_TemplateArgument ||
Rec.isUnevaluated() ||
(Rec.isConstantEvaluated() && !getLangOpts().CPlusPlus17))) {
unsigned D;
if (Rec.isUnevaluated()) {
// C++11 [expr.prim.lambda]p2:
// A lambda-expression shall not appear in an unevaluated operand
// (Clause 5).
D = diag::err_lambda_unevaluated_operand;
} else if (Rec.isConstantEvaluated() && !getLangOpts().CPlusPlus17) {
// C++1y [expr.const]p2:
// A conditional-expression e is a core constant expression unless the
// evaluation of e, following the rules of the abstract machine, would
// evaluate [...] a lambda-expression.
D = diag::err_lambda_in_constant_expression;
} else if (Rec.ExprContext == ExpressionKind::EK_TemplateArgument) {
// C++17 [expr.prim.lamda]p2:
// A lambda-expression shall not appear [...] in a template-argument.
D = diag::err_lambda_in_invalid_context;
} else
llvm_unreachable("Couldn't infer lambda error message.");
for (const auto *L : Rec.Lambdas)
Diag(L->getBeginLoc(), D);
}
}
// Append the collected materialized temporaries into previous context before
// exit if the previous also is a lifetime extending context.
auto &PrevRecord = ExprEvalContexts[ExprEvalContexts.size() - 2];
if (getLangOpts().CPlusPlus23 && isInLifetimeExtendingContext() &&
PrevRecord.InLifetimeExtendingContext && !ExprEvalContexts.empty()) {
auto &PrevRecord = ExprEvalContexts[ExprEvalContexts.size() - 2];
PrevRecord.ForRangeLifetimeExtendTemps.append(
Rec.ForRangeLifetimeExtendTemps);
}
WarnOnPendingNoDerefs(Rec);
HandleImmediateInvocations(*this, Rec);
// Warn on any volatile-qualified simple-assignments that are not discarded-
// value expressions nor unevaluated operands (those cases get removed from
// this list by CheckUnusedVolatileAssignment).
for (auto *BO : Rec.VolatileAssignmentLHSs)
Diag(BO->getBeginLoc(), diag::warn_deprecated_simple_assign_volatile)
<< BO->getType();
// When are coming out of an unevaluated context, clear out any
// temporaries that we may have created as part of the evaluation of
// the expression in that context: they aren't relevant because they
// will never be constructed.
if (Rec.isUnevaluated() || Rec.isConstantEvaluated()) {
ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
ExprCleanupObjects.end());
Cleanup = Rec.ParentCleanup;
CleanupVarDeclMarking();
std::swap(MaybeODRUseExprs, Rec.SavedMaybeODRUseExprs);
// Otherwise, merge the contexts together.
} else {
Cleanup.mergeFrom(Rec.ParentCleanup);
MaybeODRUseExprs.insert(Rec.SavedMaybeODRUseExprs.begin(),
Rec.SavedMaybeODRUseExprs.end());
}
// Pop the current expression evaluation context off the stack.
ExprEvalContexts.pop_back();
// The global expression evaluation context record is never popped.
ExprEvalContexts.back().NumTypos += NumTypos;
}
void Sema::DiscardCleanupsInEvaluationContext() {
ExprCleanupObjects.erase(
ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
ExprCleanupObjects.end());
Cleanup.reset();
MaybeODRUseExprs.clear();
}
ExprResult Sema::HandleExprEvaluationContextForTypeof(Expr *E) {
ExprResult Result = CheckPlaceholderExpr(E);
if (Result.isInvalid())
return ExprError();
E = Result.get();
if (!E->getType()->isVariablyModifiedType())
return E;
return TransformToPotentiallyEvaluated(E);
}
/// Are we in a context that is potentially constant evaluated per C++20
/// [expr.const]p12?
static bool isPotentiallyConstantEvaluatedContext(Sema &SemaRef) {
/// C++2a [expr.const]p12:
// An expression or conversion is potentially constant evaluated if it is
switch (SemaRef.ExprEvalContexts.back().Context) {
case Sema::ExpressionEvaluationContext::ConstantEvaluated:
case Sema::ExpressionEvaluationContext::ImmediateFunctionContext:
// -- a manifestly constant-evaluated expression,
case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
case Sema::ExpressionEvaluationContext::DiscardedStatement:
// -- a potentially-evaluated expression,
case Sema::ExpressionEvaluationContext::UnevaluatedList:
// -- an immediate subexpression of a braced-init-list,
// -- [FIXME] an expression of the form & cast-expression that occurs
// within a templated entity
// -- a subexpression of one of the above that is not a subexpression of
// a nested unevaluated operand.
return true;
case Sema::ExpressionEvaluationContext::Unevaluated:
case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
// Expressions in this context are never evaluated.
return false;
}
llvm_unreachable("Invalid context");
}
/// Return true if this function has a calling convention that requires mangling
/// in the size of the parameter pack.
static bool funcHasParameterSizeMangling(Sema &S, FunctionDecl *FD) {
// These manglings don't do anything on non-Windows or non-x86 platforms, so
// we don't need parameter type sizes.
const llvm::Triple &TT = S.Context.getTargetInfo().getTriple();
if (!TT.isOSWindows() || !TT.isX86())
return false;
// If this is C++ and this isn't an extern "C" function, parameters do not
// need to be complete. In this case, C++ mangling will apply, which doesn't
// use the size of the parameters.
if (S.getLangOpts().CPlusPlus && !FD->isExternC())
return false;
// Stdcall, fastcall, and vectorcall need this special treatment.
CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
switch (CC) {
case CC_X86StdCall:
case CC_X86FastCall:
case CC_X86VectorCall:
return true;
default:
break;
}
return false;
}
/// Require that all of the parameter types of function be complete. Normally,
/// parameter types are only required to be complete when a function is called
/// or defined, but to mangle functions with certain calling conventions, the
/// mangler needs to know the size of the parameter list. In this situation,
/// MSVC doesn't emit an error or instantiate templates. Instead, MSVC mangles
/// the function as _foo@0, i.e. zero bytes of parameters, which will usually
/// result in a linker error. Clang doesn't implement this behavior, and instead
/// attempts to error at compile time.
static void CheckCompleteParameterTypesForMangler(Sema &S, FunctionDecl *FD,
SourceLocation Loc) {
class ParamIncompleteTypeDiagnoser : public Sema::TypeDiagnoser {
FunctionDecl *FD;
ParmVarDecl *Param;
public:
ParamIncompleteTypeDiagnoser(FunctionDecl *FD, ParmVarDecl *Param)
: FD(FD), Param(Param) {}
void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
StringRef CCName;
switch (CC) {
case CC_X86StdCall:
CCName = "stdcall";
break;
case CC_X86FastCall:
CCName = "fastcall";
break;
case CC_X86VectorCall:
CCName = "vectorcall";
break;
default:
llvm_unreachable("CC does not need mangling");
}
S.Diag(Loc, diag::err_cconv_incomplete_param_type)
<< Param->getDeclName() << FD->getDeclName() << CCName;
}
};
for (ParmVarDecl *Param : FD->parameters()) {
ParamIncompleteTypeDiagnoser Diagnoser(FD, Param);
S.RequireCompleteType(Loc, Param->getType(), Diagnoser);
}
}
namespace {
enum class OdrUseContext {
/// Declarations in this context are not odr-used.
None,
/// Declarations in this context are formally odr-used, but this is a
/// dependent context.
Dependent,
/// Declarations in this context are odr-used but not actually used (yet).
FormallyOdrUsed,
/// Declarations in this context are used.
Used
};
}
/// Are we within a context in which references to resolved functions or to
/// variables result in odr-use?
static OdrUseContext isOdrUseContext(Sema &SemaRef) {
OdrUseContext Result;
switch (SemaRef.ExprEvalContexts.back().Context) {
case Sema::ExpressionEvaluationContext::Unevaluated:
case Sema::ExpressionEvaluationContext::UnevaluatedList:
case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
return OdrUseContext::None;
case Sema::ExpressionEvaluationContext::ConstantEvaluated:
case Sema::ExpressionEvaluationContext::ImmediateFunctionContext:
case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
Result = OdrUseContext::Used;
break;
case Sema::ExpressionEvaluationContext::DiscardedStatement:
Result = OdrUseContext::FormallyOdrUsed;
break;
case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
// A default argument formally results in odr-use, but doesn't actually
// result in a use in any real sense until it itself is used.
Result = OdrUseContext::FormallyOdrUsed;
break;
}
if (SemaRef.CurContext->isDependentContext())
return OdrUseContext::Dependent;
return Result;
}
static bool isImplicitlyDefinableConstexprFunction(FunctionDecl *Func) {
if (!Func->isConstexpr())
return false;
if (Func->isImplicitlyInstantiable() || !Func->isUserProvided())
return true;
auto *CCD = dyn_cast<CXXConstructorDecl>(Func);
return CCD && CCD->getInheritedConstructor();
}
/// Mark a function referenced, and check whether it is odr-used
/// (C++ [basic.def.odr]p2, C99 6.9p3)
void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
bool MightBeOdrUse) {
assert(Func && "No function?");
Func->setReferenced();
// Recursive functions aren't really used until they're used from some other
// context.
bool IsRecursiveCall = CurContext == Func;
// C++11 [basic.def.odr]p3:
// A function whose name appears as a potentially-evaluated expression is
// odr-used if it is the unique lookup result or the selected member of a
// set of overloaded functions [...].
//
// We (incorrectly) mark overload resolution as an unevaluated context, so we
// can just check that here.
OdrUseContext OdrUse =
MightBeOdrUse ? isOdrUseContext(*this) : OdrUseContext::None;
if (IsRecursiveCall && OdrUse == OdrUseContext::Used)
OdrUse = OdrUseContext::FormallyOdrUsed;
// Trivial default constructors and destructors are never actually used.
// FIXME: What about other special members?
if (Func->isTrivial() && !Func->hasAttr<DLLExportAttr>() &&
OdrUse == OdrUseContext::Used) {
if (auto *Constructor = dyn_cast<CXXConstructorDecl>(Func))
if (Constructor->isDefaultConstructor())
OdrUse = OdrUseContext::FormallyOdrUsed;
if (isa<CXXDestructorDecl>(Func))
OdrUse = OdrUseContext::FormallyOdrUsed;
}
// C++20 [expr.const]p12:
// A function [...] is needed for constant evaluation if it is [...] a
// constexpr function that is named by an expression that is potentially
// constant evaluated
bool NeededForConstantEvaluation =
isPotentiallyConstantEvaluatedContext(*this) &&
isImplicitlyDefinableConstexprFunction(Func);
// Determine whether we require a function definition to exist, per
// C++11 [temp.inst]p3:
// Unless a function template specialization has been explicitly
// instantiated or explicitly specialized, the function template
// specialization is implicitly instantiated when the specialization is
// referenced in a context that requires a function definition to exist.
// C++20 [temp.inst]p7:
// The existence of a definition of a [...] function is considered to
// affect the semantics of the program if the [...] function is needed for
// constant evaluation by an expression
// C++20 [basic.def.odr]p10:
// Every program shall contain exactly one definition of every non-inline
// function or variable that is odr-used in that program outside of a
// discarded statement
// C++20 [special]p1:
// The implementation will implicitly define [defaulted special members]
// if they are odr-used or needed for constant evaluation.
//
// Note that we skip the implicit instantiation of templates that are only
// used in unused default arguments or by recursive calls to themselves.
// This is formally non-conforming, but seems reasonable in practice.
bool NeedDefinition = !IsRecursiveCall && (OdrUse == OdrUseContext::Used ||
NeededForConstantEvaluation);
// C++14 [temp.expl.spec]p6:
// If a template [...] is explicitly specialized then that specialization
// shall be declared before the first use of that specialization that would
// cause an implicit instantiation to take place, in every translation unit
// in which such a use occurs
if (NeedDefinition &&
(Func->getTemplateSpecializationKind() != TSK_Undeclared ||
Func->getMemberSpecializationInfo()))
checkSpecializationReachability(Loc, Func);
if (getLangOpts().CUDA)
CheckCUDACall(Loc, Func);
// If we need a definition, try to create one.
if (NeedDefinition && !Func->getBody()) {
runWithSufficientStackSpace(Loc, [&] {
if (CXXConstructorDecl *Constructor =
dyn_cast<CXXConstructorDecl>(Func)) {
Constructor = cast<CXXConstructorDecl>(Constructor->getFirstDecl());
if (Constructor->isDefaulted() && !Constructor->isDeleted()) {
if (Constructor->isDefaultConstructor()) {
if (Constructor->isTrivial() &&
!Constructor->hasAttr<DLLExportAttr>())
return;
DefineImplicitDefaultConstructor(Loc, Constructor);
} else if (Constructor->isCopyConstructor()) {
DefineImplicitCopyConstructor(Loc, Constructor);
} else if (Constructor->isMoveConstructor()) {
DefineImplicitMoveConstructor(Loc, Constructor);
}
} else if (Constructor->getInheritedConstructor()) {
DefineInheritingConstructor(Loc, Constructor);
}
} else if (CXXDestructorDecl *Destructor =
dyn_cast<CXXDestructorDecl>(Func)) {
Destructor = cast<CXXDestructorDecl>(Destructor->getFirstDecl());
if (Destructor->isDefaulted() && !Destructor->isDeleted()) {
if (Destructor->isTrivial() && !Destructor->hasAttr<DLLExportAttr>())
return;
DefineImplicitDestructor(Loc, Destructor);
}
if (Destructor->isVirtual() && getLangOpts().AppleKext)
MarkVTableUsed(Loc, Destructor->getParent());
} else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(Func)) {
if (MethodDecl->isOverloadedOperator() &&
MethodDecl->getOverloadedOperator() == OO_Equal) {
MethodDecl = cast<CXXMethodDecl>(MethodDecl->getFirstDecl());
if (MethodDecl->isDefaulted() && !MethodDecl->isDeleted()) {
if (MethodDecl->isCopyAssignmentOperator())
DefineImplicitCopyAssignment(Loc, MethodDecl);
else if (MethodDecl->isMoveAssignmentOperator())
DefineImplicitMoveAssignment(Loc, MethodDecl);
}
} else if (isa<CXXConversionDecl>(MethodDecl) &&
MethodDecl->getParent()->isLambda()) {
CXXConversionDecl *Conversion =
cast<CXXConversionDecl>(MethodDecl->getFirstDecl());
if (Conversion->isLambdaToBlockPointerConversion())
DefineImplicitLambdaToBlockPointerConversion(Loc, Conversion);
else
DefineImplicitLambdaToFunctionPointerConversion(Loc, Conversion);
} else if (MethodDecl->isVirtual() && getLangOpts().AppleKext)
MarkVTableUsed(Loc, MethodDecl->getParent());
}
if (Func->isDefaulted() && !Func->isDeleted()) {
DefaultedComparisonKind DCK = getDefaultedComparisonKind(Func);
if (DCK != DefaultedComparisonKind::None)
DefineDefaultedComparison(Loc, Func, DCK);
}
// Implicit instantiation of function templates and member functions of
// class templates.
if (Func->isImplicitlyInstantiable()) {
TemplateSpecializationKind TSK =
Func->getTemplateSpecializationKindForInstantiation();
SourceLocation PointOfInstantiation = Func->getPointOfInstantiation();
bool FirstInstantiation = PointOfInstantiation.isInvalid();
if (FirstInstantiation) {
PointOfInstantiation = Loc;
if (auto *MSI = Func->getMemberSpecializationInfo())
MSI->setPointOfInstantiation(Loc);
// FIXME: Notify listener.
else
Func->setTemplateSpecializationKind(TSK, PointOfInstantiation);
} else if (TSK != TSK_ImplicitInstantiation) {
// Use the point of use as the point of instantiation, instead of the
// point of explicit instantiation (which we track as the actual point
// of instantiation). This gives better backtraces in diagnostics.
PointOfInstantiation = Loc;
}
if (FirstInstantiation || TSK != TSK_ImplicitInstantiation ||
Func->isConstexpr()) {
if (isa<CXXRecordDecl>(Func->getDeclContext()) &&
cast<CXXRecordDecl>(Func->getDeclContext())->isLocalClass() &&
CodeSynthesisContexts.size())
PendingLocalImplicitInstantiations.push_back(
std::make_pair(Func, PointOfInstantiation));
else if (Func->isConstexpr())
// Do not defer instantiations of constexpr functions, to avoid the
// expression evaluator needing to call back into Sema if it sees a
// call to such a function.
InstantiateFunctionDefinition(PointOfInstantiation, Func);
else {
Func->setInstantiationIsPending(true);
PendingInstantiations.push_back(
std::make_pair(Func, PointOfInstantiation));
// Notify the consumer that a function was implicitly instantiated.
Consumer.HandleCXXImplicitFunctionInstantiation(Func);
}
}
} else {
// Walk redefinitions, as some of them may be instantiable.
for (auto *i : Func->redecls()) {
if (!i->isUsed(false) && i->isImplicitlyInstantiable())
MarkFunctionReferenced(Loc, i, MightBeOdrUse);
}
}
});
}
// If a constructor was defined in the context of a default parameter
// or of another default member initializer (ie a PotentiallyEvaluatedIfUsed
// context), its initializers may not be referenced yet.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Func)) {
EnterExpressionEvaluationContext EvalContext(
*this,
Constructor->isImmediateFunction()
? ExpressionEvaluationContext::ImmediateFunctionContext
: ExpressionEvaluationContext::PotentiallyEvaluated,
Constructor);
for (CXXCtorInitializer *Init : Constructor->inits()) {
if (Init->isInClassMemberInitializer())
runWithSufficientStackSpace(Init->getSourceLocation(), [&]() {
MarkDeclarationsReferencedInExpr(Init->getInit());
});
}
}
// C++14 [except.spec]p17:
// An exception-specification is considered to be needed when:
// - the function is odr-used or, if it appears in an unevaluated operand,
// would be odr-used if the expression were potentially-evaluated;
//
// Note, we do this even if MightBeOdrUse is false. That indicates that the
// function is a pure virtual function we're calling, and in that case the
// function was selected by overload resolution and we need to resolve its
// exception specification for a different reason.
const FunctionProtoType *FPT = Func->getType()->getAs<FunctionProtoType>();
if (FPT && isUnresolvedExceptionSpec(FPT->getExceptionSpecType()))
ResolveExceptionSpec(Loc, FPT);
// A callee could be called by a host function then by a device function.
// If we only try recording once, we will miss recording the use on device
// side. Therefore keep trying until it is recorded.
if (LangOpts.OffloadImplicitHostDeviceTemplates && LangOpts.CUDAIsDevice &&
!getASTContext().CUDAImplicitHostDeviceFunUsedByDevice.count(Func))
CUDARecordImplicitHostDeviceFuncUsedByDevice(Func);
// If this is the first "real" use, act on that.
if (OdrUse == OdrUseContext::Used && !Func->isUsed(/*CheckUsedAttr=*/false)) {
// Keep track of used but undefined functions.
if (!Func->isDefined()) {
if (mightHaveNonExternalLinkage(Func))
UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
else if (Func->getMostRecentDecl()->isInlined() &&
!LangOpts.GNUInline &&
!Func->getMostRecentDecl()->hasAttr<GNUInlineAttr>())
UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
else if (isExternalWithNoLinkageType(Func))
UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
}
// Some x86 Windows calling conventions mangle the size of the parameter
// pack into the name. Computing the size of the parameters requires the
// parameter types to be complete. Check that now.
if (funcHasParameterSizeMangling(*this, Func))
CheckCompleteParameterTypesForMangler(*this, Func, Loc);
// In the MS C++ ABI, the compiler emits destructor variants where they are
// used. If the destructor is used here but defined elsewhere, mark the
// virtual base destructors referenced. If those virtual base destructors
// are inline, this will ensure they are defined when emitting the complete
// destructor variant. This checking may be redundant if the destructor is
// provided later in this TU.
if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
if (auto *Dtor = dyn_cast<CXXDestructorDecl>(Func)) {
CXXRecordDecl *Parent = Dtor->getParent();
if (Parent->getNumVBases() > 0 && !Dtor->getBody())
CheckCompleteDestructorVariant(Loc, Dtor);
}
}
Func->markUsed(Context);
}
}
/// Directly mark a variable odr-used. Given a choice, prefer to use
/// MarkVariableReferenced since it does additional checks and then
/// calls MarkVarDeclODRUsed.
/// If the variable must be captured:
/// - if FunctionScopeIndexToStopAt is null, capture it in the CurContext
/// - else capture it in the DeclContext that maps to the
/// *FunctionScopeIndexToStopAt on the FunctionScopeInfo stack.
static void
MarkVarDeclODRUsed(ValueDecl *V, SourceLocation Loc, Sema &SemaRef,
const unsigned *const FunctionScopeIndexToStopAt = nullptr) {
// Keep track of used but undefined variables.
// FIXME: We shouldn't suppress this warning for static data members.
VarDecl *Var = V->getPotentiallyDecomposedVarDecl();
assert(Var && "expected a capturable variable");
if (Var->hasDefinition(SemaRef.Context) == VarDecl::DeclarationOnly &&
(!Var->isExternallyVisible() || Var->isInline() ||
SemaRef.isExternalWithNoLinkageType(Var)) &&
!(Var->isStaticDataMember() && Var->hasInit())) {
SourceLocation &old = SemaRef.UndefinedButUsed[Var->getCanonicalDecl()];
if (old.isInvalid())
old = Loc;
}
QualType CaptureType, DeclRefType;
if (SemaRef.LangOpts.OpenMP)
SemaRef.tryCaptureOpenMPLambdas(V);
SemaRef.tryCaptureVariable(V, Loc, Sema::TryCapture_Implicit,
/*EllipsisLoc*/ SourceLocation(),
/*BuildAndDiagnose*/ true, CaptureType,
DeclRefType, FunctionScopeIndexToStopAt);
if (SemaRef.LangOpts.CUDA && Var->hasGlobalStorage()) {
auto *FD = dyn_cast_or_null<FunctionDecl>(SemaRef.CurContext);
auto VarTarget = SemaRef.IdentifyCUDATarget(Var);
auto UserTarget = SemaRef.IdentifyCUDATarget(FD);
if (VarTarget == Sema::CVT_Host &&
(UserTarget == Sema::CFT_Device || UserTarget == Sema::CFT_HostDevice ||
UserTarget == Sema::CFT_Global)) {
// Diagnose ODR-use of host global variables in device functions.
// Reference of device global variables in host functions is allowed
// through shadow variables therefore it is not diagnosed.
if (SemaRef.LangOpts.CUDAIsDevice && !SemaRef.LangOpts.HIPStdPar) {
SemaRef.targetDiag(Loc, diag::err_ref_bad_target)
<< /*host*/ 2 << /*variable*/ 1 << Var << UserTarget;
SemaRef.targetDiag(Var->getLocation(),
Var->getType().isConstQualified()
? diag::note_cuda_const_var_unpromoted
: diag::note_cuda_host_var);
}
} else if (VarTarget == Sema::CVT_Device &&
!Var->hasAttr<CUDASharedAttr>() &&
(UserTarget == Sema::CFT_Host ||
UserTarget == Sema::CFT_HostDevice)) {
// Record a CUDA/HIP device side variable if it is ODR-used
// by host code. This is done conservatively, when the variable is
// referenced in any of the following contexts:
// - a non-function context
// - a host function
// - a host device function
// This makes the ODR-use of the device side variable by host code to
// be visible in the device compilation for the compiler to be able to
// emit template variables instantiated by host code only and to
// externalize the static device side variable ODR-used by host code.
if (!Var->hasExternalStorage())
SemaRef.getASTContext().CUDADeviceVarODRUsedByHost.insert(Var);
else if (SemaRef.LangOpts.GPURelocatableDeviceCode &&
(!FD || (!FD->getDescribedFunctionTemplate() &&
SemaRef.getASTContext().GetGVALinkageForFunction(FD) ==
GVA_StrongExternal)))
SemaRef.getASTContext().CUDAExternalDeviceDeclODRUsedByHost.insert(Var);
}
}
V->markUsed(SemaRef.Context);
}
void Sema::MarkCaptureUsedInEnclosingContext(ValueDecl *Capture,
SourceLocation Loc,
unsigned CapturingScopeIndex) {
MarkVarDeclODRUsed(Capture, Loc, *this, &CapturingScopeIndex);
}
void diagnoseUncapturableValueReferenceOrBinding(Sema &S, SourceLocation loc,
ValueDecl *var) {
DeclContext *VarDC = var->getDeclContext();
// If the parameter still belongs to the translation unit, then
// we're actually just using one parameter in the declaration of
// the next.
if (isa<ParmVarDecl>(var) &&
isa<TranslationUnitDecl>(VarDC))
return;
// For C code, don't diagnose about capture if we're not actually in code
// right now; it's impossible to write a non-constant expression outside of
// function context, so we'll get other (more useful) diagnostics later.
//
// For C++, things get a bit more nasty... it would be nice to suppress this
// diagnostic for certain cases like using a local variable in an array bound
// for a member of a local class, but the correct predicate is not obvious.
if (!S.getLangOpts().CPlusPlus && !S.CurContext->isFunctionOrMethod())
return;
unsigned ValueKind = isa<BindingDecl>(var) ? 1 : 0;
unsigned ContextKind = 3; // unknown
if (isa<CXXMethodDecl>(VarDC) &&
cast<CXXRecordDecl>(VarDC->getParent())->isLambda()) {
ContextKind = 2;
} else if (isa<FunctionDecl>(VarDC)) {
ContextKind = 0;
} else if (isa<BlockDecl>(VarDC)) {
ContextKind = 1;
}
S.Diag(loc, diag::err_reference_to_local_in_enclosing_context)
<< var << ValueKind << ContextKind << VarDC;
S.Diag(var->getLocation(), diag::note_entity_declared_at)
<< var;
// FIXME: Add additional diagnostic info about class etc. which prevents
// capture.
}
static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI,
ValueDecl *Var,
bool &SubCapturesAreNested,
QualType &CaptureType,
QualType &DeclRefType) {
// Check whether we've already captured it.
if (CSI->CaptureMap.count(Var)) {
// If we found a capture, any subcaptures are nested.
SubCapturesAreNested = true;
// Retrieve the capture type for this variable.
CaptureType = CSI->getCapture(Var).getCaptureType();
// Compute the type of an expression that refers to this variable.
DeclRefType = CaptureType.getNonReferenceType();
// Similarly to mutable captures in lambda, all the OpenMP captures by copy
// are mutable in the sense that user can change their value - they are
// private instances of the captured declarations.
const Capture &Cap = CSI->getCapture(Var);
if (Cap.isCopyCapture() &&
!(isa<LambdaScopeInfo>(CSI) &&
!cast<LambdaScopeInfo>(CSI)->lambdaCaptureShouldBeConst()) &&
!(isa<CapturedRegionScopeInfo>(CSI) &&
cast<CapturedRegionScopeInfo>(CSI)->CapRegionKind == CR_OpenMP))
DeclRefType.addConst();
return true;
}
return false;
}
// Only block literals, captured statements, and lambda expressions can
// capture; other scopes don't work.
static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC,
ValueDecl *Var,
SourceLocation Loc,
const bool Diagnose,
Sema &S) {
if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC) || isLambdaCallOperator(DC))
return getLambdaAwareParentOfDeclContext(DC);
VarDecl *Underlying = Var->getPotentiallyDecomposedVarDecl();
if (Underlying) {
if (Underlying->hasLocalStorage() && Diagnose)
diagnoseUncapturableValueReferenceOrBinding(S, Loc, Var);
}
return nullptr;
}
// Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
// certain types of variables (unnamed, variably modified types etc.)
// so check for eligibility.
static bool isVariableCapturable(CapturingScopeInfo *CSI, ValueDecl *Var,
SourceLocation Loc, const bool Diagnose,
Sema &S) {
assert((isa<VarDecl, BindingDecl>(Var)) &&
"Only variables and structured bindings can be captured");
bool IsBlock = isa<BlockScopeInfo>(CSI);
bool IsLambda = isa<LambdaScopeInfo>(CSI);
// Lambdas are not allowed to capture unnamed variables
// (e.g. anonymous unions).
// FIXME: The C++11 rule don't actually state this explicitly, but I'm
// assuming that's the intent.
if (IsLambda && !Var->getDeclName()) {
if (Diagnose) {
S.Diag(Loc, diag::err_lambda_capture_anonymous_var);
S.Diag(Var->getLocation(), diag::note_declared_at);
}
return false;
}
// Prohibit variably-modified types in blocks; they're difficult to deal with.
if (Var->getType()->isVariablyModifiedType() && IsBlock) {
if (Diagnose) {
S.Diag(Loc, diag::err_ref_vm_type);
S.Diag(Var->getLocation(), diag::note_previous_decl) << Var;
}
return false;
}
// Prohibit structs with flexible array members too.
// We cannot capture what is in the tail end of the struct.
if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
if (VTTy->getDecl()->hasFlexibleArrayMember()) {
if (Diagnose) {
if (IsBlock)
S.Diag(Loc, diag::err_ref_flexarray_type);
else
S.Diag(Loc, diag::err_lambda_capture_flexarray_type) << Var;
S.Diag(Var->getLocation(), diag::note_previous_decl) << Var;
}
return false;
}
}
const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
// Lambdas and captured statements are not allowed to capture __block
// variables; they don't support the expected semantics.
if (HasBlocksAttr && (IsLambda || isa<CapturedRegionScopeInfo>(CSI))) {
if (Diagnose) {
S.Diag(Loc, diag::err_capture_block_variable) << Var << !IsLambda;
S.Diag(Var->getLocation(), diag::note_previous_decl) << Var;
}
return false;
}
// OpenCL v2.0 s6.12.5: Blocks cannot reference/capture other blocks
if (S.getLangOpts().OpenCL && IsBlock &&
Var->getType()->isBlockPointerType()) {
if (Diagnose)
S.Diag(Loc, diag::err_opencl_block_ref_block);
return false;
}
if (isa<BindingDecl>(Var)) {
if (!IsLambda || !S.getLangOpts().CPlusPlus) {
if (Diagnose)
diagnoseUncapturableValueReferenceOrBinding(S, Loc, Var);
return false;
} else if (Diagnose && S.getLangOpts().CPlusPlus) {
S.Diag(Loc, S.LangOpts.CPlusPlus20
? diag::warn_cxx17_compat_capture_binding
: diag::ext_capture_binding)
<< Var;
S.Diag(Var->getLocation(), diag::note_entity_declared_at) << Var;
}
}
return true;
}
// Returns true if the capture by block was successful.
static bool captureInBlock(BlockScopeInfo *BSI, ValueDecl *Var,
SourceLocation Loc, const bool BuildAndDiagnose,
QualType &CaptureType, QualType &DeclRefType,
const bool Nested, Sema &S, bool Invalid) {
bool ByRef = false;
// Blocks are not allowed to capture arrays, excepting OpenCL.
// OpenCL v2.0 s1.12.5 (revision 40): arrays are captured by reference
// (decayed to pointers).
if (!Invalid && !S.getLangOpts().OpenCL && CaptureType->isArrayType()) {
if (BuildAndDiagnose) {
S.Diag(Loc, diag::err_ref_array_type);
S.Diag(Var->getLocation(), diag::note_previous_decl) << Var;
Invalid = true;
} else {
return false;
}
}
// Forbid the block-capture of autoreleasing variables.
if (!Invalid &&
CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
if (BuildAndDiagnose) {
S.Diag(Loc, diag::err_arc_autoreleasing_capture)
<< /*block*/ 0;
S.Diag(Var->getLocation(), diag::note_previous_decl) << Var;
Invalid = true;
} else {
return false;
}
}
// Warn about implicitly autoreleasing indirect parameters captured by blocks.
if (const auto *PT = CaptureType->getAs<PointerType>()) {
QualType PointeeTy = PT->getPointeeType();
if (!Invalid && PointeeTy->getAs<ObjCObjectPointerType>() &&
PointeeTy.getObjCLifetime() == Qualifiers::OCL_Autoreleasing &&
!S.Context.hasDirectOwnershipQualifier(PointeeTy)) {
if (BuildAndDiagnose) {
SourceLocation VarLoc = Var->getLocation();
S.Diag(Loc, diag::warn_block_capture_autoreleasing);
S.Diag(VarLoc, diag::note_declare_parameter_strong);
}
}
}
const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
if (HasBlocksAttr || CaptureType->isReferenceType() ||
(S.getLangOpts().OpenMP && S.isOpenMPCapturedDecl(Var))) {
// Block capture by reference does not change the capture or
// declaration reference types.
ByRef = true;
} else {
// Block capture by copy introduces 'const'.
CaptureType = CaptureType.getNonReferenceType().withConst();
DeclRefType = CaptureType;
}
// Actually capture the variable.
if (BuildAndDiagnose)
BSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc, SourceLocation(),
CaptureType, Invalid);
return !Invalid;
}
/// Capture the given variable in the captured region.
static bool captureInCapturedRegion(
CapturedRegionScopeInfo *RSI, ValueDecl *Var, SourceLocation Loc,
const bool BuildAndDiagnose, QualType &CaptureType, QualType &DeclRefType,
const bool RefersToCapturedVariable, Sema::TryCaptureKind Kind,
bool IsTopScope, Sema &S, bool Invalid) {
// By default, capture variables by reference.
bool ByRef = true;
if (IsTopScope && Kind != Sema::TryCapture_Implicit) {
ByRef = (Kind == Sema::TryCapture_ExplicitByRef);
} else if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP) {
// Using an LValue reference type is consistent with Lambdas (see below).
if (S.isOpenMPCapturedDecl(Var)) {
bool HasConst = DeclRefType.isConstQualified();
DeclRefType = DeclRefType.getUnqualifiedType();
// Don't lose diagnostics about assignments to const.
if (HasConst)
DeclRefType.addConst();
}
// Do not capture firstprivates in tasks.
if (S.isOpenMPPrivateDecl(Var, RSI->OpenMPLevel, RSI->OpenMPCaptureLevel) !=
OMPC_unknown)
return true;
ByRef = S.isOpenMPCapturedByRef(Var, RSI->OpenMPLevel,
RSI->OpenMPCaptureLevel);
}
if (ByRef)
CaptureType = S.Context.getLValueReferenceType(DeclRefType);
else
CaptureType = DeclRefType;
// Actually capture the variable.
if (BuildAndDiagnose)
RSI->addCapture(Var, /*isBlock*/ false, ByRef, RefersToCapturedVariable,
Loc, SourceLocation(), CaptureType, Invalid);
return !Invalid;
}
/// Capture the given variable in the lambda.
static bool captureInLambda(LambdaScopeInfo *LSI, ValueDecl *Var,
SourceLocation Loc, const bool BuildAndDiagnose,
QualType &CaptureType, QualType &DeclRefType,
const bool RefersToCapturedVariable,
const Sema::TryCaptureKind Kind,
SourceLocation EllipsisLoc, const bool IsTopScope,
Sema &S, bool Invalid) {
// Determine whether we are capturing by reference or by value.
bool ByRef = false;
if (IsTopScope && Kind != Sema::TryCapture_Implicit) {
ByRef = (Kind == Sema::TryCapture_ExplicitByRef);
} else {
ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
}
if (BuildAndDiagnose && S.Context.getTargetInfo().getTriple().isWasm() &&
CaptureType.getNonReferenceType().isWebAssemblyReferenceType()) {
S.Diag(Loc, diag::err_wasm_ca_reference) << 0;
Invalid = true;
}
// Compute the type of the field that will capture this variable.
if (ByRef) {
// C++11 [expr.prim.lambda]p15:
// An entity is captured by reference if it is implicitly or
// explicitly captured but not captured by copy. It is
// unspecified whether additional unnamed non-static data
// members are declared in the closure type for entities
// captured by reference.
//
// FIXME: It is not clear whether we want to build an lvalue reference
// to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
// to do the former, while EDG does the latter. Core issue 1249 will
// clarify, but for now we follow GCC because it's a more permissive and
// easily defensible position.
CaptureType = S.Context.getLValueReferenceType(DeclRefType);
} else {
// C++11 [expr.prim.lambda]p14:
// For each entity captured by copy, an unnamed non-static
// data member is declared in the closure type. The
// declaration order of these members is unspecified. The type
// of such a data member is the type of the corresponding
// captured entity if the entity is not a reference to an
// object, or the referenced type otherwise. [Note: If the
// captured entity is a reference to a function, the
// corresponding data member is also a reference to a
// function. - end note ]
if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
if (!RefType->getPointeeType()->isFunctionType())
CaptureType = RefType->getPointeeType();
}
// Forbid the lambda copy-capture of autoreleasing variables.
if (!Invalid &&
CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
if (BuildAndDiagnose) {
S.Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
S.Diag(Var->getLocation(), diag::note_previous_decl)
<< Var->getDeclName();
Invalid = true;
} else {
return false;
}
}
// Make sure that by-copy captures are of a complete and non-abstract type.
if (!Invalid && BuildAndDiagnose) {
if (!CaptureType->isDependentType() &&
S.RequireCompleteSizedType(
Loc, CaptureType,
diag::err_capture_of_incomplete_or_sizeless_type,
Var->getDeclName()))
Invalid = true;
else if (S.RequireNonAbstractType(Loc, CaptureType,
diag::err_capture_of_abstract_type))
Invalid = true;
}
}
// Compute the type of a reference to this captured variable.
if (ByRef)
DeclRefType = CaptureType.getNonReferenceType();
else {
// C++ [expr.prim.lambda]p5:
// The closure type for a lambda-expression has a public inline
// function call operator [...]. This function call operator is
// declared const (9.3.1) if and only if the lambda-expression's
// parameter-declaration-clause is not followed by mutable.
DeclRefType = CaptureType.getNonReferenceType();
bool Const = LSI->lambdaCaptureShouldBeConst();
if (Const && !CaptureType->isReferenceType())
DeclRefType.addConst();
}
// Add the capture.
if (BuildAndDiagnose)
LSI->addCapture(Var, /*isBlock=*/false, ByRef, RefersToCapturedVariable,
Loc, EllipsisLoc, CaptureType, Invalid);
return !Invalid;
}
static bool canCaptureVariableByCopy(ValueDecl *Var,
const ASTContext &Context) {
// Offer a Copy fix even if the type is dependent.
if (Var->getType()->isDependentType())
return true;
QualType T = Var->getType().getNonReferenceType();
if (T.isTriviallyCopyableType(Context))
return true;
if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) {
if (!(RD = RD->getDefinition()))
return false;
if (RD->hasSimpleCopyConstructor())
return true;
if (RD->hasUserDeclaredCopyConstructor())
for (CXXConstructorDecl *Ctor : RD->ctors())
if (Ctor->isCopyConstructor())
return !Ctor->isDeleted();
}
return false;
}
/// Create up to 4 fix-its for explicit reference and value capture of \p Var or
/// default capture. Fixes may be omitted if they aren't allowed by the
/// standard, for example we can't emit a default copy capture fix-it if we
/// already explicitly copy capture capture another variable.
static void buildLambdaCaptureFixit(Sema &Sema, LambdaScopeInfo *LSI,
ValueDecl *Var) {
assert(LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None);
// Don't offer Capture by copy of default capture by copy fixes if Var is
// known not to be copy constructible.
bool ShouldOfferCopyFix = canCaptureVariableByCopy(Var, Sema.getASTContext());
SmallString<32> FixBuffer;
StringRef Separator = LSI->NumExplicitCaptures > 0 ? ", " : "";
if (Var->getDeclName().isIdentifier() && !Var->getName().empty()) {
SourceLocation VarInsertLoc = LSI->IntroducerRange.getEnd();
if (ShouldOfferCopyFix) {
// Offer fixes to insert an explicit capture for the variable.
// [] -> [VarName]
// [OtherCapture] -> [OtherCapture, VarName]
FixBuffer.assign({Separator, Var->getName()});
Sema.Diag(VarInsertLoc, diag::note_lambda_variable_capture_fixit)
<< Var << /*value*/ 0
<< FixItHint::CreateInsertion(VarInsertLoc, FixBuffer);
}
// As above but capture by reference.
FixBuffer.assign({Separator, "&", Var->getName()});
Sema.Diag(VarInsertLoc, diag::note_lambda_variable_capture_fixit)
<< Var << /*reference*/ 1
<< FixItHint::CreateInsertion(VarInsertLoc, FixBuffer);
}
// Only try to offer default capture if there are no captures excluding this
// and init captures.
// [this]: OK.
// [X = Y]: OK.
// [&A, &B]: Don't offer.
// [A, B]: Don't offer.
if (llvm::any_of(LSI->Captures, [](Capture &C) {
return !C.isThisCapture() && !C.isInitCapture();
}))
return;
// The default capture specifiers, '=' or '&', must appear first in the
// capture body.
SourceLocation DefaultInsertLoc =
LSI->IntroducerRange.getBegin().getLocWithOffset(1);
if (ShouldOfferCopyFix) {
bool CanDefaultCopyCapture = true;
// [=, *this] OK since c++17
// [=, this] OK since c++20
if (LSI->isCXXThisCaptured() && !Sema.getLangOpts().CPlusPlus20)
CanDefaultCopyCapture = Sema.getLangOpts().CPlusPlus17
? LSI->getCXXThisCapture().isCopyCapture()
: false;
// We can't use default capture by copy if any captures already specified
// capture by copy.
if (CanDefaultCopyCapture && llvm::none_of(LSI->Captures, [](Capture &C) {
return !C.isThisCapture() && !C.isInitCapture() && C.isCopyCapture();
})) {
FixBuffer.assign({"=", Separator});
Sema.Diag(DefaultInsertLoc, diag::note_lambda_default_capture_fixit)
<< /*value*/ 0
<< FixItHint::CreateInsertion(DefaultInsertLoc, FixBuffer);
}
}
// We can't use default capture by reference if any captures already specified
// capture by reference.
if (llvm::none_of(LSI->Captures, [](Capture &C) {
return !C.isInitCapture() && C.isReferenceCapture() &&
!C.isThisCapture();
})) {
FixBuffer.assign({"&", Separator});
Sema.Diag(DefaultInsertLoc, diag::note_lambda_default_capture_fixit)
<< /*reference*/ 1
<< FixItHint::CreateInsertion(DefaultInsertLoc, FixBuffer);
}
}
bool Sema::tryCaptureVariable(
ValueDecl *Var, SourceLocation ExprLoc, TryCaptureKind Kind,
SourceLocation EllipsisLoc, bool BuildAndDiagnose, QualType &CaptureType,
QualType &DeclRefType, const unsigned *const FunctionScopeIndexToStopAt) {
// An init-capture is notionally from the context surrounding its
// declaration, but its parent DC is the lambda class.
DeclContext *VarDC = Var->getDeclContext();
DeclContext *DC = CurContext;
// tryCaptureVariable is called every time a DeclRef is formed,
// it can therefore have non-negigible impact on performances.
// For local variables and when there is no capturing scope,
// we can bailout early.
if (CapturingFunctionScopes == 0 && (!BuildAndDiagnose || VarDC == DC))
return true;
const auto *VD = dyn_cast<VarDecl>(Var);
if (VD) {
if (VD->isInitCapture())
VarDC = VarDC->getParent();
} else {
VD = Var->getPotentiallyDecomposedVarDecl();
}
assert(VD && "Cannot capture a null variable");
const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt
? *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;
// We need to sync up the Declaration Context with the
// FunctionScopeIndexToStopAt
if (FunctionScopeIndexToStopAt) {
unsigned FSIndex = FunctionScopes.size() - 1;
while (FSIndex != MaxFunctionScopesIndex) {
DC = getLambdaAwareParentOfDeclContext(DC);
--FSIndex;
}
}
// Capture global variables if it is required to use private copy of this
// variable.
bool IsGlobal = !VD->hasLocalStorage();
if (IsGlobal &&
!(LangOpts.OpenMP && isOpenMPCapturedDecl(Var, /*CheckScopeInfo=*/true,
MaxFunctionScopesIndex)))
return true;
if (isa<VarDecl>(Var))
Var = cast<VarDecl>(Var->getCanonicalDecl());
// Walk up the stack to determine whether we can capture the variable,
// performing the "simple" checks that don't depend on type. We stop when
// we've either hit the declared scope of the variable or find an existing
// capture of that variable. We start from the innermost capturing-entity
// (the DC) and ensure that all intervening capturing-entities
// (blocks/lambdas etc.) between the innermost capturer and the variable`s
// declcontext can either capture the variable or have already captured
// the variable.
CaptureType = Var->getType();
DeclRefType = CaptureType.getNonReferenceType();
bool Nested = false;
bool Explicit = (Kind != TryCapture_Implicit);
unsigned FunctionScopesIndex = MaxFunctionScopesIndex;
do {
LambdaScopeInfo *LSI = nullptr;
if (!FunctionScopes.empty())
LSI = dyn_cast_or_null<LambdaScopeInfo>(
FunctionScopes[FunctionScopesIndex]);
bool IsInScopeDeclarationContext =
!LSI || LSI->AfterParameterList || CurContext == LSI->CallOperator;
if (LSI && !LSI->AfterParameterList) {
// This allows capturing parameters from a default value which does not
// seems correct
if (isa<ParmVarDecl>(Var) && !Var->getDeclContext()->isFunctionOrMethod())
return true;
}
// If the variable is declared in the current context, there is no need to
// capture it.
if (IsInScopeDeclarationContext &&
FunctionScopesIndex == MaxFunctionScopesIndex && VarDC == DC)
return true;
// Only block literals, captured statements, and lambda expressions can
// capture; other scopes don't work.
DeclContext *ParentDC =
!IsInScopeDeclarationContext
? DC->getParent()
: getParentOfCapturingContextOrNull(DC, Var, ExprLoc,
BuildAndDiagnose, *this);
// We need to check for the parent *first* because, if we *have*
// private-captured a global variable, we need to recursively capture it in
// intermediate blocks, lambdas, etc.
if (!ParentDC) {
if (IsGlobal) {
FunctionScopesIndex = MaxFunctionScopesIndex - 1;
break;
}
return true;
}
FunctionScopeInfo *FSI = FunctionScopes[FunctionScopesIndex];
CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FSI);
// Check whether we've already captured it.
if (isVariableAlreadyCapturedInScopeInfo(CSI, Var, Nested, CaptureType,
DeclRefType)) {
CSI->getCapture(Var).markUsed(BuildAndDiagnose);
break;
}
// When evaluating some attributes (like enable_if) we might refer to a
// function parameter appertaining to the same declaration as that
// attribute.
if (const auto *Parm = dyn_cast<ParmVarDecl>(Var);
Parm && Parm->getDeclContext() == DC)
return true;
// If we are instantiating a generic lambda call operator body,
// we do not want to capture new variables. What was captured
// during either a lambdas transformation or initial parsing
// should be used.
if (isGenericLambdaCallOperatorSpecialization(DC)) {
if (BuildAndDiagnose) {
LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
if (LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None) {
Diag(ExprLoc, diag::err_lambda_impcap) << Var;
Diag(Var->getLocation(), diag::note_previous_decl) << Var;
Diag(LSI->Lambda->getBeginLoc(), diag::note_lambda_decl);
buildLambdaCaptureFixit(*this, LSI, Var);
} else
diagnoseUncapturableValueReferenceOrBinding(*this, ExprLoc, Var);
}
return true;
}
// Try to capture variable-length arrays types.
if (Var->getType()->isVariablyModifiedType()) {
// We're going to walk down into the type and look for VLA
// expressions.
QualType QTy = Var->getType();
if (ParmVarDecl *PVD = dyn_cast_or_null<ParmVarDecl>(Var))
QTy = PVD->getOriginalType();
captureVariablyModifiedType(Context, QTy, CSI);
}
if (getLangOpts().OpenMP) {
if (auto *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
// OpenMP private variables should not be captured in outer scope, so
// just break here. Similarly, global variables that are captured in a
// target region should not be captured outside the scope of the region.
if (RSI->CapRegionKind == CR_OpenMP) {
// FIXME: We should support capturing structured bindings in OpenMP.
if (isa<BindingDecl>(Var)) {
if (BuildAndDiagnose) {
Diag(ExprLoc, diag::err_capture_binding_openmp) << Var;
Diag(Var->getLocation(), diag::note_entity_declared_at) << Var;
}
return true;
}
OpenMPClauseKind IsOpenMPPrivateDecl = isOpenMPPrivateDecl(
Var, RSI->OpenMPLevel, RSI->OpenMPCaptureLevel);
// If the variable is private (i.e. not captured) and has variably
// modified type, we still need to capture the type for correct
// codegen in all regions, associated with the construct. Currently,
// it is captured in the innermost captured region only.
if (IsOpenMPPrivateDecl != OMPC_unknown &&
Var->getType()->isVariablyModifiedType()) {
QualType QTy = Var->getType();
if (ParmVarDecl *PVD = dyn_cast_or_null<ParmVarDecl>(Var))
QTy = PVD->getOriginalType();
for (int I = 1, E = getNumberOfConstructScopes(RSI->OpenMPLevel);
I < E; ++I) {
auto *OuterRSI = cast<CapturedRegionScopeInfo>(
FunctionScopes[FunctionScopesIndex - I]);
assert(RSI->OpenMPLevel == OuterRSI->OpenMPLevel &&
"Wrong number of captured regions associated with the "
"OpenMP construct.");
captureVariablyModifiedType(Context, QTy, OuterRSI);
}
}
bool IsTargetCap =
IsOpenMPPrivateDecl != OMPC_private &&
isOpenMPTargetCapturedDecl(Var, RSI->OpenMPLevel,
RSI->OpenMPCaptureLevel);
// Do not capture global if it is not privatized in outer regions.
bool IsGlobalCap =
IsGlobal && isOpenMPGlobalCapturedDecl(Var, RSI->OpenMPLevel,
RSI->OpenMPCaptureLevel);
// When we detect target captures we are looking from inside the
// target region, therefore we need to propagate the capture from the
// enclosing region. Therefore, the capture is not initially nested.
if (IsTargetCap)
adjustOpenMPTargetScopeIndex(FunctionScopesIndex, RSI->OpenMPLevel);
if (IsTargetCap || IsOpenMPPrivateDecl == OMPC_private ||
(IsGlobal && !IsGlobalCap)) {
Nested = !IsTargetCap;
bool HasConst = DeclRefType.isConstQualified();
DeclRefType = DeclRefType.getUnqualifiedType();
// Don't lose diagnostics about assignments to const.
if (HasConst)
DeclRefType.addConst();
CaptureType = Context.getLValueReferenceType(DeclRefType);
break;
}
}
}
}
if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None && !Explicit) {
// No capture-default, and this is not an explicit capture
// so cannot capture this variable.
if (BuildAndDiagnose) {
Diag(ExprLoc, diag::err_lambda_impcap) << Var;
Diag(Var->getLocation(), diag::note_previous_decl) << Var;
auto *LSI = cast<LambdaScopeInfo>(CSI);
if (LSI->Lambda) {
Diag(LSI->Lambda->getBeginLoc(), diag::note_lambda_decl);
buildLambdaCaptureFixit(*this, LSI, Var);
}
// FIXME: If we error out because an outer lambda can not implicitly
// capture a variable that an inner lambda explicitly captures, we
// should have the inner lambda do the explicit capture - because
// it makes for cleaner diagnostics later. This would purely be done
// so that the diagnostic does not misleadingly claim that a variable
// can not be captured by a lambda implicitly even though it is captured
// explicitly. Suggestion:
// - create const bool VariableCaptureWasInitiallyExplicit = Explicit
// at the function head
// - cache the StartingDeclContext - this must be a lambda
// - captureInLambda in the innermost lambda the variable.
}
return true;
}
Explicit = false;
FunctionScopesIndex--;
if (IsInScopeDeclarationContext)
DC = ParentDC;
} while (!VarDC->Equals(DC));
// Walk back down the scope stack, (e.g. from outer lambda to inner lambda)
// computing the type of the capture at each step, checking type-specific
// requirements, and adding captures if requested.
// If the variable had already been captured previously, we start capturing
// at the lambda nested within that one.
bool Invalid = false;
for (unsigned I = ++FunctionScopesIndex, N = MaxFunctionScopesIndex + 1; I != N;
++I) {
CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[I]);
// Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
// certain types of variables (unnamed, variably modified types etc.)
// so check for eligibility.
if (!Invalid)
Invalid =
!isVariableCapturable(CSI, Var, ExprLoc, BuildAndDiagnose, *this);
// After encountering an error, if we're actually supposed to capture, keep
// capturing in nested contexts to suppress any follow-on diagnostics.
if (Invalid && !BuildAndDiagnose)
return true;
if (BlockScopeInfo *BSI = dyn_cast<BlockScopeInfo>(CSI)) {
Invalid = !captureInBlock(BSI, Var, ExprLoc, BuildAndDiagnose, CaptureType,
DeclRefType, Nested, *this, Invalid);
Nested = true;
} else if (CapturedRegionScopeInfo *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
Invalid = !captureInCapturedRegion(
RSI, Var, ExprLoc, BuildAndDiagnose, CaptureType, DeclRefType, Nested,
Kind, /*IsTopScope*/ I == N - 1, *this, Invalid);
Nested = true;
} else {
LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
Invalid =
!captureInLambda(LSI, Var, ExprLoc, BuildAndDiagnose, CaptureType,
DeclRefType, Nested, Kind, EllipsisLoc,
/*IsTopScope*/ I == N - 1, *this, Invalid);
Nested = true;
}
if (Invalid && !BuildAndDiagnose)
return true;
}
return Invalid;
}
bool Sema::tryCaptureVariable(ValueDecl *Var, SourceLocation Loc,
TryCaptureKind Kind, SourceLocation EllipsisLoc) {
QualType CaptureType;
QualType DeclRefType;
return tryCaptureVariable(Var, Loc, Kind, EllipsisLoc,
/*BuildAndDiagnose=*/true, CaptureType,
DeclRefType, nullptr);
}
bool Sema::NeedToCaptureVariable(ValueDecl *Var, SourceLocation Loc) {
QualType CaptureType;
QualType DeclRefType;
return !tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
/*BuildAndDiagnose=*/false, CaptureType,
DeclRefType, nullptr);
}
QualType Sema::getCapturedDeclRefType(ValueDecl *Var, SourceLocation Loc) {
QualType CaptureType;
QualType DeclRefType;
// Determine whether we can capture this variable.
if (tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
/*BuildAndDiagnose=*/false, CaptureType,
DeclRefType, nullptr))
return QualType();
return DeclRefType;
}
namespace {
// Helper to copy the template arguments from a DeclRefExpr or MemberExpr.
// The produced TemplateArgumentListInfo* points to data stored within this
// object, so should only be used in contexts where the pointer will not be
// used after the CopiedTemplateArgs object is destroyed.
class CopiedTemplateArgs {
bool HasArgs;
TemplateArgumentListInfo TemplateArgStorage;
public:
template<typename RefExpr>
CopiedTemplateArgs(RefExpr *E) : HasArgs(E->hasExplicitTemplateArgs()) {
if (HasArgs)
E->copyTemplateArgumentsInto(TemplateArgStorage);
}
operator TemplateArgumentListInfo*()
#ifdef __has_cpp_attribute
#if __has_cpp_attribute(clang::lifetimebound)
[[clang::lifetimebound]]
#endif
#endif
{
return HasArgs ? &TemplateArgStorage : nullptr;
}
};
}
/// Walk the set of potential results of an expression and mark them all as
/// non-odr-uses if they satisfy the side-conditions of the NonOdrUseReason.
///
/// \return A new expression if we found any potential results, ExprEmpty() if
/// not, and ExprError() if we diagnosed an error.
static ExprResult rebuildPotentialResultsAsNonOdrUsed(Sema &S, Expr *E,
NonOdrUseReason NOUR) {
// Per C++11 [basic.def.odr], a variable is odr-used "unless it is
// an object that satisfies the requirements for appearing in a
// constant expression (5.19) and the lvalue-to-rvalue conversion (4.1)
// is immediately applied." This function handles the lvalue-to-rvalue
// conversion part.
//
// If we encounter a node that claims to be an odr-use but shouldn't be, we
// transform it into the relevant kind of non-odr-use node and rebuild the
// tree of nodes leading to it.
//
// This is a mini-TreeTransform that only transforms a restricted subset of
// nodes (and only certain operands of them).
// Rebuild a subexpression.
auto Rebuild = [&](Expr *Sub) {
return rebuildPotentialResultsAsNonOdrUsed(S, Sub, NOUR);
};
// Check whether a potential result satisfies the requirements of NOUR.
auto IsPotentialResultOdrUsed = [&](NamedDecl *D) {
// Any entity other than a VarDecl is always odr-used whenever it's named
// in a potentially-evaluated expression.
auto *VD = dyn_cast<VarDecl>(D);
if (!VD)
return true;
// C++2a [basic.def.odr]p4:
// A variable x whose name appears as a potentially-evalauted expression
// e is odr-used by e unless
// -- x is a reference that is usable in constant expressions, or
// -- x is a variable of non-reference type that is usable in constant
// expressions and has no mutable subobjects, and e is an element of
// the set of potential results of an expression of
// non-volatile-qualified non-class type to which the lvalue-to-rvalue
// conversion is applied, or
// -- x is a variable of non-reference type, and e is an element of the
// set of potential results of a discarded-value expression to which
// the lvalue-to-rvalue conversion is not applied
//
// We check the first bullet and the "potentially-evaluated" condition in
// BuildDeclRefExpr. We check the type requirements in the second bullet
// in CheckLValueToRValueConversionOperand below.
switch (NOUR) {
case NOUR_None:
case NOUR_Unevaluated:
llvm_unreachable("unexpected non-odr-use-reason");
case NOUR_Constant:
// Constant references were handled when they were built.
if (VD->getType()->isReferenceType())
return true;
if (auto *RD = VD->getType()->getAsCXXRecordDecl())
if (RD->hasMutableFields())
return true;
if (!VD->isUsableInConstantExpressions(S.Context))
return true;
break;
case NOUR_Discarded:
if (VD->getType()->isReferenceType())
return true;
break;
}
return false;
};
// Mark that this expression does not constitute an odr-use.
auto MarkNotOdrUsed = [&] {
S.MaybeODRUseExprs.remove(E);
if (LambdaScopeInfo *LSI = S.getCurLambda())
LSI->markVariableExprAsNonODRUsed(E);
};
// C++2a [basic.def.odr]p2:
// The set of potential results of an expression e is defined as follows:
switch (E->getStmtClass()) {
// -- If e is an id-expression, ...
case Expr::DeclRefExprClass: {
auto *DRE = cast<DeclRefExpr>(E);
if (DRE->isNonOdrUse() || IsPotentialResultOdrUsed(DRE->getDecl()))
break;
// Rebuild as a non-odr-use DeclRefExpr.
MarkNotOdrUsed();
return DeclRefExpr::Create(
S.Context, DRE->getQualifierLoc(), DRE->getTemplateKeywordLoc(),
DRE->getDecl(), DRE->refersToEnclosingVariableOrCapture(),
DRE->getNameInfo(), DRE->getType(), DRE->getValueKind(),
DRE->getFoundDecl(), CopiedTemplateArgs(DRE), NOUR);
}
case Expr::FunctionParmPackExprClass: {
auto *FPPE = cast<FunctionParmPackExpr>(E);
// If any of the declarations in the pack is odr-used, then the expression
// as a whole constitutes an odr-use.
for (VarDecl *D : *FPPE)
if (IsPotentialResultOdrUsed(D))
return ExprEmpty();
// FIXME: Rebuild as a non-odr-use FunctionParmPackExpr? In practice,
// nothing cares about whether we marked this as an odr-use, but it might
// be useful for non-compiler tools.
MarkNotOdrUsed();
break;
}
// -- If e is a subscripting operation with an array operand...
case Expr::ArraySubscriptExprClass: {
auto *ASE = cast<ArraySubscriptExpr>(E);
Expr *OldBase = ASE->getBase()->IgnoreImplicit();
if (!OldBase->getType()->isArrayType())
break;
ExprResult Base = Rebuild(OldBase);
if (!Base.isUsable())
return Base;
Expr *LHS = ASE->getBase() == ASE->getLHS() ? Base.get() : ASE->getLHS();
Expr *RHS = ASE->getBase() == ASE->getRHS() ? Base.get() : ASE->getRHS();
SourceLocation LBracketLoc = ASE->getBeginLoc(); // FIXME: Not stored.
return S.ActOnArraySubscriptExpr(nullptr, LHS, LBracketLoc, RHS,
ASE->getRBracketLoc());
}
case Expr::MemberExprClass: {
auto *ME = cast<MemberExpr>(E);
// -- If e is a class member access expression [...] naming a non-static
// data member...
if (isa<FieldDecl>(ME->getMemberDecl())) {
ExprResult Base = Rebuild(ME->getBase());
if (!Base.isUsable())
return Base;
return MemberExpr::Create(
S.Context, Base.get(), ME->isArrow(), ME->getOperatorLoc(),
ME->getQualifierLoc(), ME->getTemplateKeywordLoc(),
ME->getMemberDecl(), ME->getFoundDecl(), ME->getMemberNameInfo(),
CopiedTemplateArgs(ME), ME->getType(), ME->getValueKind(),
ME->getObjectKind(), ME->isNonOdrUse());
}
if (ME->getMemberDecl()->isCXXInstanceMember())
break;
// -- If e is a class member access expression naming a static data member,
// ...
if (ME->isNonOdrUse() || IsPotentialResultOdrUsed(ME->getMemberDecl()))
break;
// Rebuild as a non-odr-use MemberExpr.
MarkNotOdrUsed();
return MemberExpr::Create(
S.Context, ME->getBase(), ME->isArrow(), ME->getOperatorLoc(),
ME->getQualifierLoc(), ME->getTemplateKeywordLoc(), ME->getMemberDecl(),
ME->getFoundDecl(), ME->getMemberNameInfo(), CopiedTemplateArgs(ME),
ME->getType(), ME->getValueKind(), ME->getObjectKind(), NOUR);
}
case Expr::BinaryOperatorClass: {
auto *BO = cast<BinaryOperator>(E);
Expr *LHS = BO->getLHS();
Expr *RHS = BO->getRHS();
// -- If e is a pointer-to-member expression of the form e1 .* e2 ...
if (BO->getOpcode() == BO_PtrMemD) {
ExprResult Sub = Rebuild(LHS);
if (!Sub.isUsable())
return Sub;
LHS = Sub.get();
// -- If e is a comma expression, ...
} else if (BO->getOpcode() == BO_Comma) {
ExprResult Sub = Rebuild(RHS);
if (!Sub.isUsable())
return Sub;
RHS = Sub.get();
} else {
break;
}
return S.BuildBinOp(nullptr, BO->getOperatorLoc(), BO->getOpcode(),
LHS, RHS);
}
// -- If e has the form (e1)...
case Expr::ParenExprClass: {
auto *PE = cast<ParenExpr>(E);
ExprResult Sub = Rebuild(PE->getSubExpr());
if (!Sub.isUsable())
return Sub;
return S.ActOnParenExpr(PE->getLParen(), PE->getRParen(), Sub.get());
}
// -- If e is a glvalue conditional expression, ...
// We don't apply this to a binary conditional operator. FIXME: Should we?
case Expr::ConditionalOperatorClass: {
auto *CO = cast<ConditionalOperator>(E);
ExprResult LHS = Rebuild(CO->getLHS());
if (LHS.isInvalid())
return ExprError();
ExprResult RHS = Rebuild(CO->getRHS());
if (RHS.isInvalid())
return ExprError();
if (!LHS.isUsable() && !RHS.isUsable())
return ExprEmpty();
if (!LHS.isUsable())
LHS = CO->getLHS();
if (!RHS.isUsable())
RHS = CO->getRHS();
return S.ActOnConditionalOp(CO->getQuestionLoc(), CO->getColonLoc(),
CO->getCond(), LHS.get(), RHS.get());
}
// [Clang extension]
// -- If e has the form __extension__ e1...
case Expr::UnaryOperatorClass: {
auto *UO = cast<UnaryOperator>(E);
if (UO->getOpcode() != UO_Extension)
break;
ExprResult Sub = Rebuild(UO->getSubExpr());
if (!Sub.isUsable())
return Sub;
return S.BuildUnaryOp(nullptr, UO->getOperatorLoc(), UO_Extension,
Sub.get());
}
// [Clang extension]
// -- If e has the form _Generic(...), the set of potential results is the
// union of the sets of potential results of the associated expressions.
case Expr::GenericSelectionExprClass: {
auto *GSE = cast<GenericSelectionExpr>(E);
SmallVector<Expr *, 4> AssocExprs;
bool AnyChanged = false;
for (Expr *OrigAssocExpr : GSE->getAssocExprs()) {
ExprResult AssocExpr = Rebuild(OrigAssocExpr);
if (AssocExpr.isInvalid())
return ExprError();
if (AssocExpr.isUsable()) {
AssocExprs.push_back(AssocExpr.get());
AnyChanged = true;
} else {
AssocExprs.push_back(OrigAssocExpr);
}
}
void *ExOrTy = nullptr;
bool IsExpr = GSE->isExprPredicate();
if (IsExpr)
ExOrTy = GSE->getControllingExpr();
else
ExOrTy = GSE->getControllingType();
return AnyChanged ? S.CreateGenericSelectionExpr(
GSE->getGenericLoc(), GSE->getDefaultLoc(),
GSE->getRParenLoc(), IsExpr, ExOrTy,
GSE->getAssocTypeSourceInfos(), AssocExprs)
: ExprEmpty();
}
// [Clang extension]
// -- If e has the form __builtin_choose_expr(...), the set of potential
// results is the union of the sets of potential results of the
// second and third subexpressions.
case Expr::ChooseExprClass: {
auto *CE = cast<ChooseExpr>(E);
ExprResult LHS = Rebuild(CE->getLHS());
if (LHS.isInvalid())
return ExprError();
ExprResult RHS = Rebuild(CE->getLHS());
if (RHS.isInvalid())
return ExprError();
if (!LHS.get() && !RHS.get())
return ExprEmpty();
if (!LHS.isUsable())
LHS = CE->getLHS();
if (!RHS.isUsable())
RHS = CE->getRHS();
return S.ActOnChooseExpr(CE->getBuiltinLoc(), CE->getCond(), LHS.get(),
RHS.get(), CE->getRParenLoc());
}
// Step through non-syntactic nodes.
case Expr::ConstantExprClass: {
auto *CE = cast<ConstantExpr>(E);
ExprResult Sub = Rebuild(CE->getSubExpr());
if (!Sub.isUsable())
return Sub;
return ConstantExpr::Create(S.Context, Sub.get());
}
// We could mostly rely on the recursive rebuilding to rebuild implicit
// casts, but not at the top level, so rebuild them here.
case Expr::ImplicitCastExprClass: {
auto *ICE = cast<ImplicitCastExpr>(E);
// Only step through the narrow set of cast kinds we expect to encounter.
// Anything else suggests we've left the region in which potential results
// can be found.
switch (ICE->getCastKind()) {
case CK_NoOp:
case CK_DerivedToBase:
case CK_UncheckedDerivedToBase: {
ExprResult Sub = Rebuild(ICE->getSubExpr());
if (!Sub.isUsable())
return Sub;
CXXCastPath Path(ICE->path());
return S.ImpCastExprToType(Sub.get(), ICE->getType(), ICE->getCastKind(),
ICE->getValueKind(), &Path);
}
default:
break;
}
break;
}
default:
break;
}
// Can't traverse through this node. Nothing to do.
return ExprEmpty();
}
ExprResult Sema::CheckLValueToRValueConversionOperand(Expr *E) {
// Check whether the operand is or contains an object of non-trivial C union
// type.
if (E->getType().isVolatileQualified() &&
(E->getType().hasNonTrivialToPrimitiveDestructCUnion() ||
E->getType().hasNonTrivialToPrimitiveCopyCUnion()))
checkNonTrivialCUnion(E->getType(), E->getExprLoc(),
Sema::NTCUC_LValueToRValueVolatile,
NTCUK_Destruct|NTCUK_Copy);
// C++2a [basic.def.odr]p4:
// [...] an expression of non-volatile-qualified non-class type to which
// the lvalue-to-rvalue conversion is applied [...]
if (E->getType().isVolatileQualified() || E->getType()->getAs<RecordType>())
return E;
ExprResult Result =
rebuildPotentialResultsAsNonOdrUsed(*this, E, NOUR_Constant);
if (Result.isInvalid())
return ExprError();
return Result.get() ? Result : E;
}
ExprResult Sema::ActOnConstantExpression(ExprResult Res) {
Res = CorrectDelayedTyposInExpr(Res);
if (!Res.isUsable())
return Res;
// If a constant-expression is a reference to a variable where we delay
// deciding whether it is an odr-use, just assume we will apply the
// lvalue-to-rvalue conversion. In the one case where this doesn't happen
// (a non-type template argument), we have special handling anyway.
return CheckLValueToRValueConversionOperand(Res.get());
}
void Sema::CleanupVarDeclMarking() {
// Iterate through a local copy in case MarkVarDeclODRUsed makes a recursive
// call.
MaybeODRUseExprSet LocalMaybeODRUseExprs;
std::swap(LocalMaybeODRUseExprs, MaybeODRUseExprs);
for (Expr *E : LocalMaybeODRUseExprs) {
if (auto *DRE = dyn_cast<DeclRefExpr>(E)) {
MarkVarDeclODRUsed(cast<VarDecl>(DRE->getDecl()),
DRE->getLocation(), *this);
} else if (auto *ME = dyn_cast<MemberExpr>(E)) {
MarkVarDeclODRUsed(cast<VarDecl>(ME->getMemberDecl()), ME->getMemberLoc(),
*this);
} else if (auto *FP = dyn_cast<FunctionParmPackExpr>(E)) {
for (VarDecl *VD : *FP)
MarkVarDeclODRUsed(VD, FP->getParameterPackLocation(), *this);
} else {
llvm_unreachable("Unexpected expression");
}
}
assert(MaybeODRUseExprs.empty() &&
"MarkVarDeclODRUsed failed to cleanup MaybeODRUseExprs?");
}
static void DoMarkPotentialCapture(Sema &SemaRef, SourceLocation Loc,
ValueDecl *Var, Expr *E) {
VarDecl *VD = Var->getPotentiallyDecomposedVarDecl();
if (!VD)
return;
const bool RefersToEnclosingScope =
(SemaRef.CurContext != VD->getDeclContext() &&
VD->getDeclContext()->isFunctionOrMethod() && VD->hasLocalStorage());
if (RefersToEnclosingScope) {
LambdaScopeInfo *const LSI =
SemaRef.getCurLambda(/*IgnoreNonLambdaCapturingScope=*/true);
if (LSI && (!LSI->CallOperator ||
!LSI->CallOperator->Encloses(Var->getDeclContext()))) {
// If a variable could potentially be odr-used, defer marking it so
// until we finish analyzing the full expression for any
// lvalue-to-rvalue
// or discarded value conversions that would obviate odr-use.
// Add it to the list of potential captures that will be analyzed
// later (ActOnFinishFullExpr) for eventual capture and odr-use marking
// unless the variable is a reference that was initialized by a constant
// expression (this will never need to be captured or odr-used).
//
// FIXME: We can simplify this a lot after implementing P0588R1.
assert(E && "Capture variable should be used in an expression.");
if (!Var->getType()->isReferenceType() ||
!VD->isUsableInConstantExpressions(SemaRef.Context))
LSI->addPotentialCapture(E->IgnoreParens());
}
}
}
static void DoMarkVarDeclReferenced(
Sema &SemaRef, SourceLocation Loc, VarDecl *Var, Expr *E,
llvm::DenseMap<const VarDecl *, int> &RefsMinusAssignments) {
assert((!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E) ||
isa<FunctionParmPackExpr>(E)) &&
"Invalid Expr argument to DoMarkVarDeclReferenced");
Var->setReferenced();
if (Var->isInvalidDecl())
return;
auto *MSI = Var->getMemberSpecializationInfo();
TemplateSpecializationKind TSK = MSI ? MSI->getTemplateSpecializationKind()
: Var->getTemplateSpecializationKind();
OdrUseContext OdrUse = isOdrUseContext(SemaRef);
bool UsableInConstantExpr =
Var->mightBeUsableInConstantExpressions(SemaRef.Context);
if (Var->isLocalVarDeclOrParm() && !Var->hasExternalStorage()) {
RefsMinusAssignments.insert({Var, 0}).first->getSecond()++;
}
// C++20 [expr.const]p12:
// A variable [...] is needed for constant evaluation if it is [...] a
// variable whose name appears as a potentially constant evaluated
// expression that is either a contexpr variable or is of non-volatile
// const-qualified integral type or of reference type
bool NeededForConstantEvaluation =
isPotentiallyConstantEvaluatedContext(SemaRef) && UsableInConstantExpr;
bool NeedDefinition =
OdrUse == OdrUseContext::Used || NeededForConstantEvaluation;
assert(!isa<VarTemplatePartialSpecializationDecl>(Var) &&
"Can't instantiate a partial template specialization.");
// If this might be a member specialization of a static data member, check
// the specialization is visible. We already did the checks for variable
// template specializations when we created them.
if (NeedDefinition && TSK != TSK_Undeclared &&
!isa<VarTemplateSpecializationDecl>(Var))
SemaRef.checkSpecializationVisibility(Loc, Var);
// Perform implicit instantiation of static data members, static data member
// templates of class templates, and variable template specializations. Delay
// instantiations of variable templates, except for those that could be used
// in a constant expression.
if (NeedDefinition && isTemplateInstantiation(TSK)) {
// Per C++17 [temp.explicit]p10, we may instantiate despite an explicit
// instantiation declaration if a variable is usable in a constant
// expression (among other cases).
bool TryInstantiating =
TSK == TSK_ImplicitInstantiation ||
(TSK == TSK_ExplicitInstantiationDeclaration && UsableInConstantExpr);
if (TryInstantiating) {
SourceLocation PointOfInstantiation =
MSI ? MSI->getPointOfInstantiation() : Var->getPointOfInstantiation();
bool FirstInstantiation = PointOfInstantiation.isInvalid();
if (FirstInstantiation) {
PointOfInstantiation = Loc;
if (MSI)
MSI->setPointOfInstantiation(PointOfInstantiation);
// FIXME: Notify listener.
else
Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
}
if (UsableInConstantExpr) {
// Do not defer instantiations of variables that could be used in a
// constant expression.
SemaRef.runWithSufficientStackSpace(PointOfInstantiation, [&] {
SemaRef.InstantiateVariableDefinition(PointOfInstantiation, Var);
});
// Re-set the member to trigger a recomputation of the dependence bits
// for the expression.
if (auto *DRE = dyn_cast_or_null<DeclRefExpr>(E))
DRE->setDecl(DRE->getDecl());
else if (auto *ME = dyn_cast_or_null<MemberExpr>(E))
ME->setMemberDecl(ME->getMemberDecl());
} else if (FirstInstantiation) {
SemaRef.PendingInstantiations
.push_back(std::make_pair(Var, PointOfInstantiation));
} else {
bool Inserted = false;
for (auto &I : SemaRef.SavedPendingInstantiations) {
auto Iter = llvm::find_if(
I, [Var](const Sema::PendingImplicitInstantiation &P) {
return P.first == Var;
});
if (Iter != I.end()) {
SemaRef.PendingInstantiations.push_back(*Iter);
I.erase(Iter);
Inserted = true;
break;
}
}
// FIXME: For a specialization of a variable template, we don't
// distinguish between "declaration and type implicitly instantiated"
// and "implicit instantiation of definition requested", so we have
// no direct way to avoid enqueueing the pending instantiation
// multiple times.
if (isa<VarTemplateSpecializationDecl>(Var) && !Inserted)
SemaRef.PendingInstantiations
.push_back(std::make_pair(Var, PointOfInstantiation));
}
}
}
// C++2a [basic.def.odr]p4:
// A variable x whose name appears as a potentially-evaluated expression e
// is odr-used by e unless
// -- x is a reference that is usable in constant expressions
// -- x is a variable of non-reference type that is usable in constant
// expressions and has no mutable subobjects [FIXME], and e is an
// element of the set of potential results of an expression of
// non-volatile-qualified non-class type to which the lvalue-to-rvalue
// conversion is applied
// -- x is a variable of non-reference type, and e is an element of the set
// of potential results of a discarded-value expression to which the
// lvalue-to-rvalue conversion is not applied [FIXME]
//
// We check the first part of the second bullet here, and
// Sema::CheckLValueToRValueConversionOperand deals with the second part.
// FIXME: To get the third bullet right, we need to delay this even for
// variables that are not usable in constant expressions.
// If we already know this isn't an odr-use, there's nothing more to do.
if (DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(E))
if (DRE->isNonOdrUse())
return;
if (MemberExpr *ME = dyn_cast_or_null<MemberExpr>(E))
if (ME->isNonOdrUse())
return;
switch (OdrUse) {
case OdrUseContext::None:
// In some cases, a variable may not have been marked unevaluated, if it
// appears in a defaukt initializer.
assert((!E || isa<FunctionParmPackExpr>(E) ||
SemaRef.isUnevaluatedContext()) &&
"missing non-odr-use marking for unevaluated decl ref");
break;
case OdrUseContext::FormallyOdrUsed:
// FIXME: Ignoring formal odr-uses results in incorrect lambda capture
// behavior.
break;
case OdrUseContext::Used:
// If we might later find that this expression isn't actually an odr-use,
// delay the marking.
if (E && Var->isUsableInConstantExpressions(SemaRef.Context))
SemaRef.MaybeODRUseExprs.insert(E);
else
MarkVarDeclODRUsed(Var, Loc, SemaRef);
break;
case OdrUseContext::Dependent:
// If this is a dependent context, we don't need to mark variables as
// odr-used, but we may still need to track them for lambda capture.
// FIXME: Do we also need to do this inside dependent typeid expressions
// (which are modeled as unevaluated at this point)?
DoMarkPotentialCapture(SemaRef, Loc, Var, E);
break;
}
}
static void DoMarkBindingDeclReferenced(Sema &SemaRef, SourceLocation Loc,
BindingDecl *BD, Expr *E) {
BD->setReferenced();
if (BD->isInvalidDecl())
return;
OdrUseContext OdrUse = isOdrUseContext(SemaRef);
if (OdrUse == OdrUseContext::Used) {
QualType CaptureType, DeclRefType;
SemaRef.tryCaptureVariable(BD, Loc, Sema::TryCapture_Implicit,
/*EllipsisLoc*/ SourceLocation(),
/*BuildAndDiagnose*/ true, CaptureType,
DeclRefType,
/*FunctionScopeIndexToStopAt*/ nullptr);
} else if (OdrUse == OdrUseContext::Dependent) {
DoMarkPotentialCapture(SemaRef, Loc, BD, E);
}
}
/// Mark a variable referenced, and check whether it is odr-used
/// (C++ [basic.def.odr]p2, C99 6.9p3). Note that this should not be
/// used directly for normal expressions referring to VarDecl.
void Sema::MarkVariableReferenced(SourceLocation Loc, VarDecl *Var) {
DoMarkVarDeclReferenced(*this, Loc, Var, nullptr, RefsMinusAssignments);
}
// C++ [temp.dep.expr]p3:
// An id-expression is type-dependent if it contains:
// - an identifier associated by name lookup with an entity captured by copy
// in a lambda-expression that has an explicit object parameter whose type
// is dependent ([dcl.fct]),
static void FixDependencyOfIdExpressionsInLambdaWithDependentObjectParameter(
Sema &SemaRef, ValueDecl *D, Expr *E) {
auto *ID = dyn_cast<DeclRefExpr>(E);
if (!ID || ID->isTypeDependent())
return;
auto IsDependent = [&]() {
const LambdaScopeInfo *LSI = SemaRef.getCurLambda();
if (!LSI)
return false;
if (!LSI->ExplicitObjectParameter ||
!LSI->ExplicitObjectParameter->getType()->isDependentType())
return false;
if (!LSI->CaptureMap.count(D))
return false;
const Capture &Cap = LSI->getCapture(D);
return !Cap.isCopyCapture();
}();
ID->setCapturedByCopyInLambdaWithExplicitObjectParameter(
IsDependent, SemaRef.getASTContext());
}
static void
MarkExprReferenced(Sema &SemaRef, SourceLocation Loc, Decl *D, Expr *E,
bool MightBeOdrUse,
llvm::DenseMap<const VarDecl *, int> &RefsMinusAssignments) {
if (SemaRef.isInOpenMPDeclareTargetContext())
SemaRef.checkDeclIsAllowedInOpenMPTarget(E, D);
if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
DoMarkVarDeclReferenced(SemaRef, Loc, Var, E, RefsMinusAssignments);
if (SemaRef.getLangOpts().CPlusPlus)
FixDependencyOfIdExpressionsInLambdaWithDependentObjectParameter(SemaRef,
Var, E);
return;
}
if (BindingDecl *Decl = dyn_cast<BindingDecl>(D)) {
DoMarkBindingDeclReferenced(SemaRef, Loc, Decl, E);
if (SemaRef.getLangOpts().CPlusPlus)
FixDependencyOfIdExpressionsInLambdaWithDependentObjectParameter(SemaRef,
Decl, E);
return;
}
SemaRef.MarkAnyDeclReferenced(Loc, D, MightBeOdrUse);
// If this is a call to a method via a cast, also mark the method in the
// derived class used in case codegen can devirtualize the call.
const MemberExpr *ME = dyn_cast<MemberExpr>(E);
if (!ME)
return;
CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
if (!MD)
return;
// Only attempt to devirtualize if this is truly a virtual call.
bool IsVirtualCall = MD->isVirtual() &&
ME->performsVirtualDispatch(SemaRef.getLangOpts());
if (!IsVirtualCall)
return;
// If it's possible to devirtualize the call, mark the called function
// referenced.
CXXMethodDecl *DM = MD->getDevirtualizedMethod(
ME->getBase(), SemaRef.getLangOpts().AppleKext);
if (DM)
SemaRef.MarkAnyDeclReferenced(Loc, DM, MightBeOdrUse);
}
/// Perform reference-marking and odr-use handling for a DeclRefExpr.
///
/// Note, this may change the dependence of the DeclRefExpr, and so needs to be
/// handled with care if the DeclRefExpr is not newly-created.
void Sema::MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base) {
// TODO: update this with DR# once a defect report is filed.
// C++11 defect. The address of a pure member should not be an ODR use, even
// if it's a qualified reference.
bool OdrUse = true;
if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getDecl()))
if (Method->isVirtual() &&
!Method->getDevirtualizedMethod(Base, getLangOpts().AppleKext))
OdrUse = false;
if (auto *FD = dyn_cast<FunctionDecl>(E->getDecl())) {
if (!isUnevaluatedContext() && !isConstantEvaluatedContext() &&
!isImmediateFunctionContext() &&
!isCheckingDefaultArgumentOrInitializer() &&
FD->isImmediateFunction() && !RebuildingImmediateInvocation &&
!FD->isDependentContext())
ExprEvalContexts.back().ReferenceToConsteval.insert(E);
}
MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse,
RefsMinusAssignments);
}
/// Perform reference-marking and odr-use handling for a MemberExpr.
void Sema::MarkMemberReferenced(MemberExpr *E) {
// C++11 [basic.def.odr]p2:
// A non-overloaded function whose name appears as a potentially-evaluated
// expression or a member of a set of candidate functions, if selected by
// overload resolution when referred to from a potentially-evaluated
// expression, is odr-used, unless it is a pure virtual function and its
// name is not explicitly qualified.
bool MightBeOdrUse = true;
if (E->performsVirtualDispatch(getLangOpts())) {
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getMemberDecl()))
if (Method->isPureVirtual())
MightBeOdrUse = false;
}
SourceLocation Loc =
E->getMemberLoc().isValid() ? E->getMemberLoc() : E->getBeginLoc();
MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, MightBeOdrUse,
RefsMinusAssignments);
}
/// Perform reference-marking and odr-use handling for a FunctionParmPackExpr.
void Sema::MarkFunctionParmPackReferenced(FunctionParmPackExpr *E) {
for (VarDecl *VD : *E)
MarkExprReferenced(*this, E->getParameterPackLocation(), VD, E, true,
RefsMinusAssignments);
}
/// Perform marking for a reference to an arbitrary declaration. It
/// marks the declaration referenced, and performs odr-use checking for
/// functions and variables. This method should not be used when building a
/// normal expression which refers to a variable.
void Sema::MarkAnyDeclReferenced(SourceLocation Loc, Decl *D,
bool MightBeOdrUse) {
if (MightBeOdrUse) {
if (auto *VD = dyn_cast<VarDecl>(D)) {
MarkVariableReferenced(Loc, VD);
return;
}
}
if (auto *FD = dyn_cast<FunctionDecl>(D)) {
MarkFunctionReferenced(Loc, FD, MightBeOdrUse);
return;
}
D->setReferenced();
}
namespace {
// Mark all of the declarations used by a type as referenced.
// FIXME: Not fully implemented yet! We need to have a better understanding
// of when we're entering a context we should not recurse into.
// FIXME: This is and EvaluatedExprMarker are more-or-less equivalent to
// TreeTransforms rebuilding the type in a new context. Rather than
// duplicating the TreeTransform logic, we should consider reusing it here.
// Currently that causes problems when rebuilding LambdaExprs.
class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
Sema &S;
SourceLocation Loc;
public:
typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
bool TraverseTemplateArgument(const TemplateArgument &Arg);
};
}
bool MarkReferencedDecls::TraverseTemplateArgument(
const TemplateArgument &Arg) {
{
// A non-type template argument is a constant-evaluated context.
EnterExpressionEvaluationContext Evaluated(
S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
if (Arg.getKind() == TemplateArgument::Declaration) {
if (Decl *D = Arg.getAsDecl())
S.MarkAnyDeclReferenced(Loc, D, true);
} else if (Arg.getKind() == TemplateArgument::Expression) {
S.MarkDeclarationsReferencedInExpr(Arg.getAsExpr(), false);
}
}
return Inherited::TraverseTemplateArgument(Arg);
}
void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
MarkReferencedDecls Marker(*this, Loc);
Marker.TraverseType(T);
}
namespace {
/// Helper class that marks all of the declarations referenced by
/// potentially-evaluated subexpressions as "referenced".
class EvaluatedExprMarker : public UsedDeclVisitor<EvaluatedExprMarker> {
public:
typedef UsedDeclVisitor<EvaluatedExprMarker> Inherited;
bool SkipLocalVariables;
ArrayRef<const Expr *> StopAt;
EvaluatedExprMarker(Sema &S, bool SkipLocalVariables,
ArrayRef<const Expr *> StopAt)
: Inherited(S), SkipLocalVariables(SkipLocalVariables), StopAt(StopAt) {}
void visitUsedDecl(SourceLocation Loc, Decl *D) {
S.MarkFunctionReferenced(Loc, cast<FunctionDecl>(D));
}
void Visit(Expr *E) {
if (llvm::is_contained(StopAt, E))
return;
Inherited::Visit(E);
}
void VisitConstantExpr(ConstantExpr *E) {
// Don't mark declarations within a ConstantExpression, as this expression
// will be evaluated and folded to a value.
}
void VisitDeclRefExpr(DeclRefExpr *E) {
// If we were asked not to visit local variables, don't.
if (SkipLocalVariables) {
if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
if (VD->hasLocalStorage())
return;
}
// FIXME: This can trigger the instantiation of the initializer of a
// variable, which can cause the expression to become value-dependent
// or error-dependent. Do we need to propagate the new dependence bits?
S.MarkDeclRefReferenced(E);
}
void VisitMemberExpr(MemberExpr *E) {
S.MarkMemberReferenced(E);
Visit(E->getBase());
}
};
} // namespace
/// Mark any declarations that appear within this expression or any
/// potentially-evaluated subexpressions as "referenced".
///
/// \param SkipLocalVariables If true, don't mark local variables as
/// 'referenced'.
/// \param StopAt Subexpressions that we shouldn't recurse into.
void Sema::MarkDeclarationsReferencedInExpr(Expr *E,
bool SkipLocalVariables,
ArrayRef<const Expr*> StopAt) {
EvaluatedExprMarker(*this, SkipLocalVariables, StopAt).Visit(E);
}
/// Emit a diagnostic when statements are reachable.
/// FIXME: check for reachability even in expressions for which we don't build a
/// CFG (eg, in the initializer of a global or in a constant expression).
/// For example,
/// namespace { auto *p = new double[3][false ? (1, 2) : 3]; }
bool Sema::DiagIfReachable(SourceLocation Loc, ArrayRef<const Stmt *> Stmts,
const PartialDiagnostic &PD) {
if (!Stmts.empty() && getCurFunctionOrMethodDecl()) {
if (!FunctionScopes.empty())
FunctionScopes.back()->PossiblyUnreachableDiags.push_back(
sema::PossiblyUnreachableDiag(PD, Loc, Stmts));
return true;
}
// The initializer of a constexpr variable or of the first declaration of a
// static data member is not syntactically a constant evaluated constant,
// but nonetheless is always required to be a constant expression, so we
// can skip diagnosing.
// FIXME: Using the mangling context here is a hack.
if (auto *VD = dyn_cast_or_null<VarDecl>(
ExprEvalContexts.back().ManglingContextDecl)) {
if (VD->isConstexpr() ||
(VD->isStaticDataMember() && VD->isFirstDecl() && !VD->isInline()))
return false;
// FIXME: For any other kind of variable, we should build a CFG for its
// initializer and check whether the context in question is reachable.
}
Diag(Loc, PD);
return true;
}
/// Emit a diagnostic that describes an effect on the run-time behavior
/// of the program being compiled.
///
/// This routine emits the given diagnostic when the code currently being
/// type-checked is "potentially evaluated", meaning that there is a
/// possibility that the code will actually be executable. Code in sizeof()
/// expressions, code used only during overload resolution, etc., are not
/// potentially evaluated. This routine will suppress such diagnostics or,
/// in the absolutely nutty case of potentially potentially evaluated
/// expressions (C++ typeid), queue the diagnostic to potentially emit it
/// later.
///
/// This routine should be used for all diagnostics that describe the run-time
/// behavior of a program, such as passing a non-POD value through an ellipsis.
/// Failure to do so will likely result in spurious diagnostics or failures
/// during overload resolution or within sizeof/alignof/typeof/typeid.
bool Sema::DiagRuntimeBehavior(SourceLocation Loc, ArrayRef<const Stmt*> Stmts,
const PartialDiagnostic &PD) {
if (ExprEvalContexts.back().isDiscardedStatementContext())
return false;
switch (ExprEvalContexts.back().Context) {
case ExpressionEvaluationContext::Unevaluated:
case ExpressionEvaluationContext::UnevaluatedList:
case ExpressionEvaluationContext::UnevaluatedAbstract:
case ExpressionEvaluationContext::DiscardedStatement:
// The argument will never be evaluated, so don't complain.
break;
case ExpressionEvaluationContext::ConstantEvaluated:
case ExpressionEvaluationContext::ImmediateFunctionContext:
// Relevant diagnostics should be produced by constant evaluation.
break;
case ExpressionEvaluationContext::PotentiallyEvaluated:
case ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
return DiagIfReachable(Loc, Stmts, PD);
}
return false;
}
bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
const PartialDiagnostic &PD) {
return DiagRuntimeBehavior(
Loc, Statement ? llvm::ArrayRef(Statement) : std::nullopt, PD);
}
bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
CallExpr *CE, FunctionDecl *FD) {
if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
return false;
// If we're inside a decltype's expression, don't check for a valid return
// type or construct temporaries until we know whether this is the last call.
if (ExprEvalContexts.back().ExprContext ==
ExpressionEvaluationContextRecord::EK_Decltype) {
ExprEvalContexts.back().DelayedDecltypeCalls.push_back(CE);
return false;
}
class CallReturnIncompleteDiagnoser : public TypeDiagnoser {
FunctionDecl *FD;
CallExpr *CE;
public:
CallReturnIncompleteDiagnoser(FunctionDecl *FD, CallExpr *CE)
: FD(FD), CE(CE) { }
void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
if (!FD) {
S.Diag(Loc, diag::err_call_incomplete_return)
<< T << CE->getSourceRange();
return;
}
S.Diag(Loc, diag::err_call_function_incomplete_return)
<< CE->getSourceRange() << FD << T;
S.Diag(FD->getLocation(), diag::note_entity_declared_at)
<< FD->getDeclName();
}
} Diagnoser(FD, CE);
if (RequireCompleteType(Loc, ReturnType, Diagnoser))
return true;
return false;
}
// Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
// will prevent this condition from triggering, which is what we want.
void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
SourceLocation Loc;
unsigned diagnostic = diag::warn_condition_is_assignment;
bool IsOrAssign = false;
if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
return;
IsOrAssign = Op->getOpcode() == BO_OrAssign;
// Greylist some idioms by putting them into a warning subcategory.
if (ObjCMessageExpr *ME
= dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
Selector Sel = ME->getSelector();
// self = [<foo> init...]
if (isSelfExpr(Op->getLHS()) && ME->getMethodFamily() == OMF_init)
diagnostic = diag::warn_condition_is_idiomatic_assignment;
// <foo> = [<bar> nextObject]
else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
diagnostic = diag::warn_condition_is_idiomatic_assignment;
}
Loc = Op->getOperatorLoc();
} else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
return;
IsOrAssign = Op->getOperator() == OO_PipeEqual;
Loc = Op->getOperatorLoc();
} else if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E))
return DiagnoseAssignmentAsCondition(POE->getSyntacticForm());
else {
// Not an assignment.
return;
}
Diag(Loc, diagnostic) << E->getSourceRange();
SourceLocation Open = E->getBeginLoc();
SourceLocation Close = getLocForEndOfToken(E->getSourceRange().getEnd());
Diag(Loc, diag::note_condition_assign_silence)
<< FixItHint::CreateInsertion(Open, "(")
<< FixItHint::CreateInsertion(Close, ")");
if (IsOrAssign)
Diag(Loc, diag::note_condition_or_assign_to_comparison)
<< FixItHint::CreateReplacement(Loc, "!=");
else
Diag(Loc, diag::note_condition_assign_to_comparison)
<< FixItHint::CreateReplacement(Loc, "==");
}
/// Redundant parentheses over an equality comparison can indicate
/// that the user intended an assignment used as condition.
void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
// Don't warn if the parens came from a macro.
SourceLocation parenLoc = ParenE->getBeginLoc();
if (parenLoc.isInvalid() || parenLoc.isMacroID())
return;
// Don't warn for dependent expressions.
if (ParenE->isTypeDependent())
return;
Expr *E = ParenE->IgnoreParens();
if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
if (opE->getOpcode() == BO_EQ &&
opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
== Expr::MLV_Valid) {
SourceLocation Loc = opE->getOperatorLoc();
Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
SourceRange ParenERange = ParenE->getSourceRange();
Diag(Loc, diag::note_equality_comparison_silence)
<< FixItHint::CreateRemoval(ParenERange.getBegin())
<< FixItHint::CreateRemoval(ParenERange.getEnd());
Diag(Loc, diag::note_equality_comparison_to_assign)
<< FixItHint::CreateReplacement(Loc, "=");
}
}
ExprResult Sema::CheckBooleanCondition(SourceLocation Loc, Expr *E,
bool IsConstexpr) {
DiagnoseAssignmentAsCondition(E);
if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
DiagnoseEqualityWithExtraParens(parenE);
ExprResult result = CheckPlaceholderExpr(E);
if (result.isInvalid()) return ExprError();
E = result.get();
if (!E->isTypeDependent()) {
if (getLangOpts().CPlusPlus)
return CheckCXXBooleanCondition(E, IsConstexpr); // C++ 6.4p4
ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
if (ERes.isInvalid())
return ExprError();
E = ERes.get();
QualType T = E->getType();
if (!T->isScalarType()) { // C99 6.8.4.1p1
Diag(Loc, diag::err_typecheck_statement_requires_scalar)
<< T << E->getSourceRange();
return ExprError();
}
CheckBoolLikeConversion(E, Loc);
}
return E;
}
Sema::ConditionResult Sema::ActOnCondition(Scope *S, SourceLocation Loc,
Expr *SubExpr, ConditionKind CK,
bool MissingOK) {
// MissingOK indicates whether having no condition expression is valid
// (for loop) or invalid (e.g. while loop).
if (!SubExpr)
return MissingOK ? ConditionResult() : ConditionError();
ExprResult Cond;
switch (CK) {
case ConditionKind::Boolean:
Cond = CheckBooleanCondition(Loc, SubExpr);
break;
case ConditionKind::ConstexprIf:
Cond = CheckBooleanCondition(Loc, SubExpr, true);
break;
case ConditionKind::Switch:
Cond = CheckSwitchCondition(Loc, SubExpr);
break;
}
if (Cond.isInvalid()) {
Cond = CreateRecoveryExpr(SubExpr->getBeginLoc(), SubExpr->getEndLoc(),
{SubExpr}, PreferredConditionType(CK));
if (!Cond.get())
return ConditionError();
}
// FIXME: FullExprArg doesn't have an invalid bit, so check nullness instead.
FullExprArg FullExpr = MakeFullExpr(Cond.get(), Loc);
if (!FullExpr.get())
return ConditionError();
return ConditionResult(*this, nullptr, FullExpr,
CK == ConditionKind::ConstexprIf);
}
namespace {
/// A visitor for rebuilding a call to an __unknown_any expression
/// to have an appropriate type.
struct RebuildUnknownAnyFunction
: StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
Sema &S;
RebuildUnknownAnyFunction(Sema &S) : S(S) {}
ExprResult VisitStmt(Stmt *S) {
llvm_unreachable("unexpected statement!");
}
ExprResult VisitExpr(Expr *E) {
S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
<< E->getSourceRange();
return ExprError();
}
/// Rebuild an expression which simply semantically wraps another
/// expression which it shares the type and value kind of.
template <class T> ExprResult rebuildSugarExpr(T *E) {
ExprResult SubResult = Visit(E->getSubExpr());
if (SubResult.isInvalid()) return ExprError();
Expr *SubExpr = SubResult.get();
E->setSubExpr(SubExpr);
E->setType(SubExpr->getType());
E->setValueKind(SubExpr->getValueKind());
assert(E->getObjectKind() == OK_Ordinary);
return E;
}
ExprResult VisitParenExpr(ParenExpr *E) {
return rebuildSugarExpr(E);
}
ExprResult VisitUnaryExtension(UnaryOperator *E) {
return rebuildSugarExpr(E);
}
ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
ExprResult SubResult = Visit(E->getSubExpr());
if (SubResult.isInvalid()) return ExprError();
Expr *SubExpr = SubResult.get();
E->setSubExpr(SubExpr);
E->setType(S.Context.getPointerType(SubExpr->getType()));
assert(E->isPRValue());
assert(E->getObjectKind() == OK_Ordinary);
return E;
}
ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
if (!isa<FunctionDecl>(VD)) return VisitExpr(E);
E->setType(VD->getType());
assert(E->isPRValue());
if (S.getLangOpts().CPlusPlus &&
!(isa<CXXMethodDecl>(VD) &&
cast<CXXMethodDecl>(VD)->isInstance()))
E->setValueKind(VK_LValue);
return E;
}
ExprResult VisitMemberExpr(MemberExpr *E) {
return resolveDecl(E, E->getMemberDecl());
}
ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
return resolveDecl(E, E->getDecl());
}
};
}
/// Given a function expression of unknown-any type, try to rebuild it
/// to have a function type.
static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
if (Result.isInvalid()) return ExprError();
return S.DefaultFunctionArrayConversion(Result.get());
}
namespace {
/// A visitor for rebuilding an expression of type __unknown_anytype
/// into one which resolves the type directly on the referring
/// expression. Strict preservation of the original source
/// structure is not a goal.
struct RebuildUnknownAnyExpr
: StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
Sema &S;
/// The current destination type.
QualType DestType;
RebuildUnknownAnyExpr(Sema &S, QualType CastType)
: S(S), DestType(CastType) {}
ExprResult VisitStmt(Stmt *S) {
llvm_unreachable("unexpected statement!");
}
ExprResult VisitExpr(Expr *E) {
S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
<< E->getSourceRange();
return ExprError();
}
ExprResult VisitCallExpr(CallExpr *E);
ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);
/// Rebuild an expression which simply semantically wraps another
/// expression which it shares the type and value kind of.
template <class T> ExprResult rebuildSugarExpr(T *E) {
ExprResult SubResult = Visit(E->getSubExpr());
if (SubResult.isInvalid()) return ExprError();
Expr *SubExpr = SubResult.get();
E->setSubExpr(SubExpr);
E->setType(SubExpr->getType());
E->setValueKind(SubExpr->getValueKind());
assert(E->getObjectKind() == OK_Ordinary);
return E;
}
ExprResult VisitParenExpr(ParenExpr *E) {
return rebuildSugarExpr(E);
}
ExprResult VisitUnaryExtension(UnaryOperator *E) {
return rebuildSugarExpr(E);
}
ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
const PointerType *Ptr = DestType->getAs<PointerType>();
if (!Ptr) {
S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
<< E->getSourceRange();
return ExprError();
}
if (isa<CallExpr>(E->getSubExpr())) {
S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof_call)
<< E->getSourceRange();
return ExprError();
}
assert(E->isPRValue());
assert(E->getObjectKind() == OK_Ordinary);
E->setType(DestType);
// Build the sub-expression as if it were an object of the pointee type.
DestType = Ptr->getPointeeType();
ExprResult SubResult = Visit(E->getSubExpr());
if (SubResult.isInvalid()) return ExprError();
E->setSubExpr(SubResult.get());
return E;
}
ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);
ExprResult resolveDecl(Expr *E, ValueDecl *VD);
ExprResult VisitMemberExpr(MemberExpr *E) {
return resolveDecl(E, E->getMemberDecl());
}
ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
return resolveDecl(E, E->getDecl());
}
};
}
/// Rebuilds a call expression which yielded __unknown_anytype.
ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
Expr *CalleeExpr = E->getCallee();
enum FnKind {
FK_MemberFunction,
FK_FunctionPointer,
FK_BlockPointer
};
FnKind Kind;
QualType CalleeType = CalleeExpr->getType();
if (CalleeType == S.Context.BoundMemberTy) {
assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E));
Kind = FK_MemberFunction;
CalleeType = Expr::findBoundMemberType(CalleeExpr);
} else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
CalleeType = Ptr->getPointeeType();
Kind = FK_FunctionPointer;
} else {
CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
Kind = FK_BlockPointer;
}
const FunctionType *FnType = CalleeType->castAs<FunctionType>();
// Verify that this is a legal result type of a function.
if (DestType->isArrayType() || DestType->isFunctionType()) {
unsigned diagID = diag::err_func_returning_array_function;
if (Kind == FK_BlockPointer)
diagID = diag::err_block_returning_array_function;
S.Diag(E->getExprLoc(), diagID)
<< DestType->isFunctionType() << DestType;
return ExprError();
}
// Otherwise, go ahead and set DestType as the call's result.
E->setType(DestType.getNonLValueExprType(S.Context));
E->setValueKind(Expr::getValueKindForType(DestType));
assert(E->getObjectKind() == OK_Ordinary);
// Rebuild the function type, replacing the result type with DestType.
const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType);
if (Proto) {
// __unknown_anytype(...) is a special case used by the debugger when
// it has no idea what a function's signature is.
//
// We want to build this call essentially under the K&R
// unprototyped rules, but making a FunctionNoProtoType in C++
// would foul up all sorts of assumptions. However, we cannot
// simply pass all arguments as variadic arguments, nor can we
// portably just call the function under a non-variadic type; see
// the comment on IR-gen's TargetInfo::isNoProtoCallVariadic.
// However, it turns out that in practice it is generally safe to
// call a function declared as "A foo(B,C,D);" under the prototype
// "A foo(B,C,D,...);". The only known exception is with the
// Windows ABI, where any variadic function is implicitly cdecl
// regardless of its normal CC. Therefore we change the parameter
// types to match the types of the arguments.
//
// This is a hack, but it is far superior to moving the
// corresponding target-specific code from IR-gen to Sema/AST.
ArrayRef<QualType> ParamTypes = Proto->getParamTypes();
SmallVector<QualType, 8> ArgTypes;
if (ParamTypes.empty() && Proto->isVariadic()) { // the special case
ArgTypes.reserve(E->getNumArgs());
for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) {
ArgTypes.push_back(S.Context.getReferenceQualifiedType(E->getArg(i)));
}
ParamTypes = ArgTypes;
}
DestType = S.Context.getFunctionType(DestType, ParamTypes,
Proto->getExtProtoInfo());
} else {
DestType = S.Context.getFunctionNoProtoType(DestType,
FnType->getExtInfo());
}
// Rebuild the appropriate pointer-to-function type.
switch (Kind) {
case FK_MemberFunction:
// Nothing to do.
break;
case FK_FunctionPointer:
DestType = S.Context.getPointerType(DestType);
break;
case FK_BlockPointer:
DestType = S.Context.getBlockPointerType(DestType);
break;
}
// Finally, we can recurse.
ExprResult CalleeResult = Visit(CalleeExpr);
if (!CalleeResult.isUsable()) return ExprError();
E->setCallee(CalleeResult.get());
// Bind a temporary if necessary.
return S.MaybeBindToTemporary(E);
}
ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
// Verify that this is a legal result type of a call.
if (DestType->isArrayType() || DestType->isFunctionType()) {
S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
<< DestType->isFunctionType() << DestType;
return ExprError();
}
// Rewrite the method result type if available.
if (ObjCMethodDecl *Method = E->getMethodDecl()) {
assert(Method->getReturnType() == S.Context.UnknownAnyTy);
Method->setReturnType(DestType);
}
// Change the type of the message.
E->setType(DestType.getNonReferenceType());
E->setValueKind(Expr::getValueKindForType(DestType));
return S.MaybeBindToTemporary(E);
}
ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
// The only case we should ever see here is a function-to-pointer decay.
if (E->getCastKind() == CK_FunctionToPointerDecay) {
assert(E->isPRValue());
assert(E->getObjectKind() == OK_Ordinary);
E->setType(DestType);
// Rebuild the sub-expression as the pointee (function) type.
DestType = DestType->castAs<PointerType>()->getPointeeType();
ExprResult Result = Visit(E->getSubExpr());
if (!Result.isUsable()) return ExprError();
E->setSubExpr(Result.get());
return E;
} else if (E->getCastKind() == CK_LValueToRValue) {
assert(E->isPRValue());
assert(E->getObjectKind() == OK_Ordinary);
assert(isa<BlockPointerType>(E->getType()));
E->setType(DestType);
// The sub-expression has to be a lvalue reference, so rebuild it as such.
DestType = S.Context.getLValueReferenceType(DestType);
ExprResult Result = Visit(E->getSubExpr());
if (!Result.isUsable()) return ExprError();
E->setSubExpr(Result.get());
return E;
} else {
llvm_unreachable("Unhandled cast type!");
}
}
ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
ExprValueKind ValueKind = VK_LValue;
QualType Type = DestType;
// We know how to make this work for certain kinds of decls:
// - functions
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
if (const PointerType *Ptr = Type->getAs<PointerType>()) {
DestType = Ptr->getPointeeType();
ExprResult Result = resolveDecl(E, VD);
if (Result.isInvalid()) return ExprError();
return S.ImpCastExprToType(Result.get(), Type, CK_FunctionToPointerDecay,
VK_PRValue);
}
if (!Type->isFunctionType()) {
S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
<< VD << E->getSourceRange();
return ExprError();
}
if (const FunctionProtoType *FT = Type->getAs<FunctionProtoType>()) {
// We must match the FunctionDecl's type to the hack introduced in
// RebuildUnknownAnyExpr::VisitCallExpr to vararg functions of unknown
// type. See the lengthy commentary in that routine.
QualType FDT = FD->getType();
const FunctionType *FnType = FDT->castAs<FunctionType>();
const FunctionProtoType *Proto = dyn_cast_or_null<FunctionProtoType>(FnType);
DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
if (DRE && Proto && Proto->getParamTypes().empty() && Proto->isVariadic()) {
SourceLocation Loc = FD->getLocation();
FunctionDecl *NewFD = FunctionDecl::Create(
S.Context, FD->getDeclContext(), Loc, Loc,
FD->getNameInfo().getName(), DestType, FD->getTypeSourceInfo(),
SC_None, S.getCurFPFeatures().isFPConstrained(),
false /*isInlineSpecified*/, FD->hasPrototype(),
/*ConstexprKind*/ ConstexprSpecKind::Unspecified);
if (FD->getQualifier())
NewFD->setQualifierInfo(FD->getQualifierLoc());
SmallVector<ParmVarDecl*, 16> Params;
for (const auto &AI : FT->param_types()) {
ParmVarDecl *Param =
S.BuildParmVarDeclForTypedef(FD, Loc, AI);
Param->setScopeInfo(0, Params.size());
Params.push_back(Param);
}
NewFD->setParams(Params);
DRE->setDecl(NewFD);
VD = DRE->getDecl();
}
}
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
if (MD->isInstance()) {
ValueKind = VK_PRValue;
Type = S.Context.BoundMemberTy;
}
// Function references aren't l-values in C.
if (!S.getLangOpts().CPlusPlus)
ValueKind = VK_PRValue;
// - variables
} else if (isa<VarDecl>(VD)) {
if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
Type = RefTy->getPointeeType();
} else if (Type->isFunctionType()) {
S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
<< VD << E->getSourceRange();
return ExprError();
}
// - nothing else
} else {
S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
<< VD << E->getSourceRange();
return ExprError();
}
// Modifying the declaration like this is friendly to IR-gen but
// also really dangerous.
VD->setType(DestType);
E->setType(Type);
E->setValueKind(ValueKind);
return E;
}
/// Check a cast of an unknown-any type. We intentionally only
/// trigger this for C-style casts.
ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
Expr *CastExpr, CastKind &CastKind,
ExprValueKind &VK, CXXCastPath &Path) {
// The type we're casting to must be either void or complete.
if (!CastType->isVoidType() &&
RequireCompleteType(TypeRange.getBegin(), CastType,
diag::err_typecheck_cast_to_incomplete))
return ExprError();
// Rewrite the casted expression from scratch.
ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
if (!result.isUsable()) return ExprError();
CastExpr = result.get();
VK = CastExpr->getValueKind();
CastKind = CK_NoOp;
return CastExpr;
}
ExprResult Sema::forceUnknownAnyToType(Expr *E, QualType ToType) {
return RebuildUnknownAnyExpr(*this, ToType).Visit(E);
}
ExprResult Sema::checkUnknownAnyArg(SourceLocation callLoc,
Expr *arg, QualType &paramType) {
// If the syntactic form of the argument is not an explicit cast of
// any sort, just do default argument promotion.
ExplicitCastExpr *castArg = dyn_cast<ExplicitCastExpr>(arg->IgnoreParens());
if (!castArg) {
ExprResult result = DefaultArgumentPromotion(arg);
if (result.isInvalid()) return ExprError();
paramType = result.get()->getType();
return result;
}
// Otherwise, use the type that was written in the explicit cast.
assert(!arg->hasPlaceholderType());
paramType = castArg->getTypeAsWritten();
// Copy-initialize a parameter of that type.
InitializedEntity entity =
InitializedEntity::InitializeParameter(Context, paramType,
/*consumed*/ false);
return PerformCopyInitialization(entity, callLoc, arg);
}
static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
Expr *orig = E;
unsigned diagID = diag::err_uncasted_use_of_unknown_any;
while (true) {
E = E->IgnoreParenImpCasts();
if (CallExpr *call = dyn_cast<CallExpr>(E)) {
E = call->getCallee();
diagID = diag::err_uncasted_call_of_unknown_any;
} else {
break;
}
}
SourceLocation loc;
NamedDecl *d;
if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
loc = ref->getLocation();
d = ref->getDecl();
} else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
loc = mem->getMemberLoc();
d = mem->getMemberDecl();
} else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
diagID = diag::err_uncasted_call_of_unknown_any;
loc = msg->getSelectorStartLoc();
d = msg->getMethodDecl();
if (!d) {
S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
<< static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
<< orig->getSourceRange();
return ExprError();
}
} else {
S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
<< E->getSourceRange();
return ExprError();
}
S.Diag(loc, diagID) << d << orig->getSourceRange();
// Never recoverable.
return ExprError();
}
/// Check for operands with placeholder types and complain if found.
/// Returns ExprError() if there was an error and no recovery was possible.
ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
if (!Context.isDependenceAllowed()) {
// C cannot handle TypoExpr nodes on either side of a binop because it
// doesn't handle dependent types properly, so make sure any TypoExprs have
// been dealt with before checking the operands.
ExprResult Result = CorrectDelayedTyposInExpr(E);
if (!Result.isUsable()) return ExprError();
E = Result.get();
}
const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
if (!placeholderType) return E;
switch (placeholderType->getKind()) {
// Overloaded expressions.
case BuiltinType::Overload: {
// Try to resolve a single function template specialization.
// This is obligatory.
ExprResult Result = E;
if (ResolveAndFixSingleFunctionTemplateSpecialization(Result, false))
return Result;
// No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
// leaves Result unchanged on failure.
Result = E;
if (resolveAndFixAddressOfSingleOverloadCandidate(Result))
return Result;
// If that failed, try to recover with a call.
tryToRecoverWithCall(Result, PDiag(diag::err_ovl_unresolvable),
/*complain*/ true);
return Result;
}
// Bound member functions.
case BuiltinType::BoundMember: {
ExprResult result = E;
const Expr *BME = E->IgnoreParens();
PartialDiagnostic PD = PDiag(diag::err_bound_member_function);
// Try to give a nicer diagnostic if it is a bound member that we recognize.
if (isa<CXXPseudoDestructorExpr>(BME)) {
PD = PDiag(diag::err_dtor_expr_without_call) << /*pseudo-destructor*/ 1;
} else if (const auto *ME = dyn_cast<MemberExpr>(BME)) {
if (ME->getMemberNameInfo().getName().getNameKind() ==
DeclarationName::CXXDestructorName)
PD = PDiag(diag::err_dtor_expr_without_call) << /*destructor*/ 0;
}
tryToRecoverWithCall(result, PD,
/*complain*/ true);
return result;
}
// ARC unbridged casts.
case BuiltinType::ARCUnbridgedCast: {
Expr *realCast = stripARCUnbridgedCast(E);
diagnoseARCUnbridgedCast(realCast);
return realCast;
}
// Expressions of unknown type.
case BuiltinType::UnknownAny:
return diagnoseUnknownAnyExpr(*this, E);
// Pseudo-objects.
case BuiltinType::PseudoObject:
return checkPseudoObjectRValue(E);
case BuiltinType::BuiltinFn: {
// Accept __noop without parens by implicitly converting it to a call expr.
auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
if (DRE) {
auto *FD = cast<FunctionDecl>(DRE->getDecl());
unsigned BuiltinID = FD->getBuiltinID();
if (BuiltinID == Builtin::BI__noop) {
E = ImpCastExprToType(E, Context.getPointerType(FD->getType()),
CK_BuiltinFnToFnPtr)
.get();
return CallExpr::Create(Context, E, /*Args=*/{}, Context.IntTy,
VK_PRValue, SourceLocation(),
FPOptionsOverride());
}
if (Context.BuiltinInfo.isInStdNamespace(BuiltinID)) {
// Any use of these other than a direct call is ill-formed as of C++20,
// because they are not addressable functions. In earlier language
// modes, warn and force an instantiation of the real body.
Diag(E->getBeginLoc(),
getLangOpts().CPlusPlus20
? diag::err_use_of_unaddressable_function
: diag::warn_cxx20_compat_use_of_unaddressable_function);
if (FD->isImplicitlyInstantiable()) {
// Require a definition here because a normal attempt at
// instantiation for a builtin will be ignored, and we won't try
// again later. We assume that the definition of the template
// precedes this use.
InstantiateFunctionDefinition(E->getBeginLoc(), FD,
/*Recursive=*/false,
/*DefinitionRequired=*/true,
/*AtEndOfTU=*/false);
}
// Produce a properly-typed reference to the function.
CXXScopeSpec SS;
SS.Adopt(DRE->getQualifierLoc());
TemplateArgumentListInfo TemplateArgs;
DRE->copyTemplateArgumentsInto(TemplateArgs);
return BuildDeclRefExpr(
FD, FD->getType(), VK_LValue, DRE->getNameInfo(),
DRE->hasQualifier() ? &SS : nullptr, DRE->getFoundDecl(),
DRE->getTemplateKeywordLoc(),
DRE->hasExplicitTemplateArgs() ? &TemplateArgs : nullptr);
}
}
Diag(E->getBeginLoc(), diag::err_builtin_fn_use);
return ExprError();
}
case BuiltinType::IncompleteMatrixIdx:
Diag(cast<MatrixSubscriptExpr>(E->IgnoreParens())
->getRowIdx()
->getBeginLoc(),
diag::err_matrix_incomplete_index);
return ExprError();
// Expressions of unknown type.
case BuiltinType::OMPArraySection:
Diag(E->getBeginLoc(), diag::err_omp_array_section_use);
return ExprError();
// Expressions of unknown type.
case BuiltinType::OMPArrayShaping:
return ExprError(Diag(E->getBeginLoc(), diag::err_omp_array_shaping_use));
case BuiltinType::OMPIterator:
return ExprError(Diag(E->getBeginLoc(), diag::err_omp_iterator_use));
// Everything else should be impossible.
#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id:
#include "clang/Basic/OpenCLImageTypes.def"
#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id:
#include "clang/Basic/OpenCLExtensionTypes.def"
#define SVE_TYPE(Name, Id, SingletonId) \
case BuiltinType::Id:
#include "clang/Basic/AArch64SVEACLETypes.def"
#define PPC_VECTOR_TYPE(Name, Id, Size) \
case BuiltinType::Id:
#include "clang/Basic/PPCTypes.def"
#define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
#include "clang/Basic/RISCVVTypes.def"
#define WASM_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
#include "clang/Basic/WebAssemblyReferenceTypes.def"
#define BUILTIN_TYPE(Id, SingletonId) case BuiltinType::Id:
#define PLACEHOLDER_TYPE(Id, SingletonId)
#include "clang/AST/BuiltinTypes.def"
break;
}
llvm_unreachable("invalid placeholder type!");
}
bool Sema::CheckCaseExpression(Expr *E) {
if (E->isTypeDependent())
return true;
if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
return E->getType()->isIntegralOrEnumerationType();
return false;
}
/// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
ExprResult
Sema::ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
assert((Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) &&
"Unknown Objective-C Boolean value!");
QualType BoolT = Context.ObjCBuiltinBoolTy;
if (!Context.getBOOLDecl()) {
LookupResult Result(*this, &Context.Idents.get("BOOL"), OpLoc,
Sema::LookupOrdinaryName);
if (LookupName(Result, getCurScope()) && Result.isSingleResult()) {
NamedDecl *ND = Result.getFoundDecl();
if (TypedefDecl *TD = dyn_cast<TypedefDecl>(ND))
Context.setBOOLDecl(TD);
}
}
if (Context.getBOOLDecl())
BoolT = Context.getBOOLType();
return new (Context)
ObjCBoolLiteralExpr(Kind == tok::kw___objc_yes, BoolT, OpLoc);
}
ExprResult Sema::ActOnObjCAvailabilityCheckExpr(
llvm::ArrayRef<AvailabilitySpec> AvailSpecs, SourceLocation AtLoc,
SourceLocation RParen) {
auto FindSpecVersion =
[&](StringRef Platform) -> std::optional<VersionTuple> {
auto Spec = llvm::find_if(AvailSpecs, [&](const AvailabilitySpec &Spec) {
return Spec.getPlatform() == Platform;
});
// Transcribe the "ios" availability check to "maccatalyst" when compiling
// for "maccatalyst" if "maccatalyst" is not specified.
if (Spec == AvailSpecs.end() && Platform == "maccatalyst") {
Spec = llvm::find_if(AvailSpecs, [&](const AvailabilitySpec &Spec) {
return Spec.getPlatform() == "ios";
});
}
if (Spec == AvailSpecs.end())
return std::nullopt;
return Spec->getVersion();
};
VersionTuple Version;
if (auto MaybeVersion =
FindSpecVersion(Context.getTargetInfo().getPlatformName()))
Version = *MaybeVersion;
// The use of `@available` in the enclosing context should be analyzed to
// warn when it's used inappropriately (i.e. not if(@available)).
if (FunctionScopeInfo *Context = getCurFunctionAvailabilityContext())
Context->HasPotentialAvailabilityViolations = true;
return new (Context)
ObjCAvailabilityCheckExpr(Version, AtLoc, RParen, Context.BoolTy);
}
ExprResult Sema::CreateRecoveryExpr(SourceLocation Begin, SourceLocation End,
ArrayRef<Expr *> SubExprs, QualType T) {
if (!Context.getLangOpts().RecoveryAST)
return ExprError();
if (isSFINAEContext())
return ExprError();
if (T.isNull() || T->isUndeducedType() ||
!Context.getLangOpts().RecoveryASTType)
// We don't know the concrete type, fallback to dependent type.
T = Context.DependentTy;
return RecoveryExpr::Create(Context, T, Begin, End, SubExprs);
}
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