mirrors/llvm-project
0
0
Fork 0
mirror of https://github.com/llvm/llvm-project.git synced 2025-04-25 04:56:06 +00:00
Code Issues Projects Releases Wiki Activity
llvm-project/clang/lib/Sema/SemaTemplateInstantiate.cpp
Matheus Izvekov 954ccee5d5
[clang] fix partial ordering of NTTP packs (#134461) 
This fixes partial ordering of pack expansions of NTTPs, by procedding
with the check using the pattern of the NTTP through the rules of the
non-pack case.

This also unifies almost all of the different versions of
FinishTemplateArgumentDeduction (except the function template case).
This makes sure they all follow the rules consistently, instantiating
the parameters and comparing those with the argument.

Fixes #132562
2025-04-07 12:30:51 -03:00

4636 lines
190 KiB
C++
Raw Blame History

//===------- SemaTemplateInstantiate.cpp - C++ Template Instantiation ------===/
//
// 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 C++ template instantiation.
//
//===----------------------------------------------------------------------===/
#include "TreeTransform.h"
#include "clang/AST/ASTConcept.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DynamicRecursiveASTVisitor.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprConcepts.h"
#include "clang/AST/PrettyDeclStackTrace.h"
#include "clang/AST/Type.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/TypeVisitor.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/EnterExpressionEvaluationContext.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Sema.h"
#include "clang/Sema/SemaConcept.h"
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/Template.h"
#include "clang/Sema/TemplateDeduction.h"
#include "clang/Sema/TemplateInstCallback.h"
#include "llvm/ADT/STLForwardCompat.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/TimeProfiler.h"
#include <optional>
using namespace clang;
using namespace sema;
//===----------------------------------------------------------------------===/
// Template Instantiation Support
//===----------------------------------------------------------------------===/
namespace {
namespace TemplateInstArgsHelpers {
struct Response {
const Decl *NextDecl = nullptr;
bool IsDone = false;
bool ClearRelativeToPrimary = true;
static Response Done() {
Response R;
R.IsDone = true;
return R;
}
static Response ChangeDecl(const Decl *ND) {
Response R;
R.NextDecl = ND;
return R;
}
static Response ChangeDecl(const DeclContext *Ctx) {
Response R;
R.NextDecl = Decl::castFromDeclContext(Ctx);
return R;
}
static Response UseNextDecl(const Decl *CurDecl) {
return ChangeDecl(CurDecl->getDeclContext());
}
static Response DontClearRelativeToPrimaryNextDecl(const Decl *CurDecl) {
Response R = Response::UseNextDecl(CurDecl);
R.ClearRelativeToPrimary = false;
return R;
}
};
// Retrieve the primary template for a lambda call operator. It's
// unfortunate that we only have the mappings of call operators rather
// than lambda classes.
const FunctionDecl *
getPrimaryTemplateOfGenericLambda(const FunctionDecl *LambdaCallOperator) {
if (!isLambdaCallOperator(LambdaCallOperator))
return LambdaCallOperator;
while (true) {
if (auto *FTD = dyn_cast_if_present<FunctionTemplateDecl>(
LambdaCallOperator->getDescribedTemplate());
FTD && FTD->getInstantiatedFromMemberTemplate()) {
LambdaCallOperator =
FTD->getInstantiatedFromMemberTemplate()->getTemplatedDecl();
} else if (LambdaCallOperator->getPrimaryTemplate()) {
// Cases where the lambda operator is instantiated in
// TemplateDeclInstantiator::VisitCXXMethodDecl.
LambdaCallOperator =
LambdaCallOperator->getPrimaryTemplate()->getTemplatedDecl();
} else if (auto *Prev = cast<CXXMethodDecl>(LambdaCallOperator)
->getInstantiatedFromMemberFunction())
LambdaCallOperator = Prev;
else
break;
}
return LambdaCallOperator;
}
struct EnclosingTypeAliasTemplateDetails {
TypeAliasTemplateDecl *Template = nullptr;
TypeAliasTemplateDecl *PrimaryTypeAliasDecl = nullptr;
ArrayRef<TemplateArgument> AssociatedTemplateArguments;
explicit operator bool() noexcept { return Template; }
};
// Find the enclosing type alias template Decl from CodeSynthesisContexts, as
// well as its primary template and instantiating template arguments.
EnclosingTypeAliasTemplateDetails
getEnclosingTypeAliasTemplateDecl(Sema &SemaRef) {
for (auto &CSC : llvm::reverse(SemaRef.CodeSynthesisContexts)) {
if (CSC.Kind != Sema::CodeSynthesisContext::SynthesisKind::
TypeAliasTemplateInstantiation)
continue;
EnclosingTypeAliasTemplateDetails Result;
auto *TATD = cast<TypeAliasTemplateDecl>(CSC.Entity),
*Next = TATD->getInstantiatedFromMemberTemplate();
Result = {
/*Template=*/TATD,
/*PrimaryTypeAliasDecl=*/TATD,
/*AssociatedTemplateArguments=*/CSC.template_arguments(),
};
while (Next) {
Result.PrimaryTypeAliasDecl = Next;
Next = Next->getInstantiatedFromMemberTemplate();
}
return Result;
}
return {};
}
// Check if we are currently inside of a lambda expression that is
// surrounded by a using alias declaration. e.g.
// template <class> using type = decltype([](auto) { ^ }());
// We have to do so since a TypeAliasTemplateDecl (or a TypeAliasDecl) is never
// a DeclContext, nor does it have an associated specialization Decl from which
// we could collect these template arguments.
bool isLambdaEnclosedByTypeAliasDecl(
const FunctionDecl *LambdaCallOperator,
const TypeAliasTemplateDecl *PrimaryTypeAliasDecl) {
struct Visitor : DynamicRecursiveASTVisitor {
Visitor(const FunctionDecl *CallOperator) : CallOperator(CallOperator) {}
bool VisitLambdaExpr(LambdaExpr *LE) override {
// Return true to bail out of the traversal, implying the Decl contains
// the lambda.
return getPrimaryTemplateOfGenericLambda(LE->getCallOperator()) !=
CallOperator;
}
const FunctionDecl *CallOperator;
};
QualType Underlying =
PrimaryTypeAliasDecl->getTemplatedDecl()->getUnderlyingType();
return !Visitor(getPrimaryTemplateOfGenericLambda(LambdaCallOperator))
.TraverseType(Underlying);
}
// Add template arguments from a variable template instantiation.
Response
HandleVarTemplateSpec(const VarTemplateSpecializationDecl *VarTemplSpec,
MultiLevelTemplateArgumentList &Result,
bool SkipForSpecialization) {
// For a class-scope explicit specialization, there are no template arguments
// at this level, but there may be enclosing template arguments.
if (VarTemplSpec->isClassScopeExplicitSpecialization())
return Response::DontClearRelativeToPrimaryNextDecl(VarTemplSpec);
// We're done when we hit an explicit specialization.
if (VarTemplSpec->getSpecializationKind() == TSK_ExplicitSpecialization &&
!isa<VarTemplatePartialSpecializationDecl>(VarTemplSpec))
return Response::Done();
// If this variable template specialization was instantiated from a
// specialized member that is a variable template, we're done.
assert(VarTemplSpec->getSpecializedTemplate() && "No variable template?");
llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
Specialized = VarTemplSpec->getSpecializedTemplateOrPartial();
if (VarTemplatePartialSpecializationDecl *Partial =
dyn_cast<VarTemplatePartialSpecializationDecl *>(Specialized)) {
if (!SkipForSpecialization)
Result.addOuterTemplateArguments(
Partial, VarTemplSpec->getTemplateInstantiationArgs().asArray(),
/*Final=*/false);
if (Partial->isMemberSpecialization())
return Response::Done();
} else {
VarTemplateDecl *Tmpl = cast<VarTemplateDecl *>(Specialized);
if (!SkipForSpecialization)
Result.addOuterTemplateArguments(
Tmpl, VarTemplSpec->getTemplateInstantiationArgs().asArray(),
/*Final=*/false);
if (Tmpl->isMemberSpecialization())
return Response::Done();
}
return Response::DontClearRelativeToPrimaryNextDecl(VarTemplSpec);
}
// If we have a template template parameter with translation unit context,
// then we're performing substitution into a default template argument of
// this template template parameter before we've constructed the template
// that will own this template template parameter. In this case, we
// use empty template parameter lists for all of the outer templates
// to avoid performing any substitutions.
Response
HandleDefaultTempArgIntoTempTempParam(const TemplateTemplateParmDecl *TTP,
MultiLevelTemplateArgumentList &Result) {
for (unsigned I = 0, N = TTP->getDepth() + 1; I != N; ++I)
Result.addOuterTemplateArguments(std::nullopt);
return Response::Done();
}
Response HandlePartialClassTemplateSpec(
const ClassTemplatePartialSpecializationDecl *PartialClassTemplSpec,
MultiLevelTemplateArgumentList &Result, bool SkipForSpecialization) {
if (!SkipForSpecialization)
Result.addOuterRetainedLevels(PartialClassTemplSpec->getTemplateDepth());
return Response::Done();
}
// Add template arguments from a class template instantiation.
Response
HandleClassTemplateSpec(const ClassTemplateSpecializationDecl *ClassTemplSpec,
MultiLevelTemplateArgumentList &Result,
bool SkipForSpecialization) {
if (!ClassTemplSpec->isClassScopeExplicitSpecialization()) {
// We're done when we hit an explicit specialization.
if (ClassTemplSpec->getSpecializationKind() == TSK_ExplicitSpecialization &&
!isa<ClassTemplatePartialSpecializationDecl>(ClassTemplSpec))
return Response::Done();
if (!SkipForSpecialization)
Result.addOuterTemplateArguments(
const_cast<ClassTemplateSpecializationDecl *>(ClassTemplSpec),
ClassTemplSpec->getTemplateInstantiationArgs().asArray(),
/*Final=*/false);
// If this class template specialization was instantiated from a
// specialized member that is a class template, we're done.
assert(ClassTemplSpec->getSpecializedTemplate() && "No class template?");
if (ClassTemplSpec->getSpecializedTemplate()->isMemberSpecialization())
return Response::Done();
// If this was instantiated from a partial template specialization, we need
// to get the next level of declaration context from the partial
// specialization, as the ClassTemplateSpecializationDecl's
// DeclContext/LexicalDeclContext will be for the primary template.
if (auto *InstFromPartialTempl =
ClassTemplSpec->getSpecializedTemplateOrPartial()
.dyn_cast<ClassTemplatePartialSpecializationDecl *>())
return Response::ChangeDecl(
InstFromPartialTempl->getLexicalDeclContext());
}
return Response::UseNextDecl(ClassTemplSpec);
}
Response HandleFunction(Sema &SemaRef, const FunctionDecl *Function,
MultiLevelTemplateArgumentList &Result,
const FunctionDecl *Pattern, bool RelativeToPrimary,
bool ForConstraintInstantiation,
bool ForDefaultArgumentSubstitution) {
// Add template arguments from a function template specialization.
if (!RelativeToPrimary &&
Function->getTemplateSpecializationKindForInstantiation() ==
TSK_ExplicitSpecialization)
return Response::Done();
if (!RelativeToPrimary &&
Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) {
// This is an implicit instantiation of an explicit specialization. We
// don't get any template arguments from this function but might get
// some from an enclosing template.
return Response::UseNextDecl(Function);
} else if (const TemplateArgumentList *TemplateArgs =
Function->getTemplateSpecializationArgs()) {
// Add the template arguments for this specialization.
Result.addOuterTemplateArguments(const_cast<FunctionDecl *>(Function),
TemplateArgs->asArray(),
/*Final=*/false);
if (RelativeToPrimary &&
(Function->getTemplateSpecializationKind() ==
TSK_ExplicitSpecialization ||
(Function->getFriendObjectKind() &&
!Function->getPrimaryTemplate()->getFriendObjectKind())))
return Response::UseNextDecl(Function);
// If this function was instantiated from a specialized member that is
// a function template, we're done.
assert(Function->getPrimaryTemplate() && "No function template?");
if (!ForDefaultArgumentSubstitution &&
Function->getPrimaryTemplate()->isMemberSpecialization())
return Response::Done();
// If this function is a generic lambda specialization, we are done.
if (!ForConstraintInstantiation &&
isGenericLambdaCallOperatorOrStaticInvokerSpecialization(Function))
return Response::Done();
} else if (Function->getDescribedFunctionTemplate()) {
assert(
(ForConstraintInstantiation || Result.getNumSubstitutedLevels() == 0) &&
"Outer template not instantiated?");
}
// If this is a friend or local declaration and it declares an entity at
// namespace scope, take arguments from its lexical parent
// instead of its semantic parent, unless of course the pattern we're
// instantiating actually comes from the file's context!
if ((Function->getFriendObjectKind() || Function->isLocalExternDecl()) &&
Function->getNonTransparentDeclContext()->isFileContext() &&
(!Pattern || !Pattern->getLexicalDeclContext()->isFileContext())) {
return Response::ChangeDecl(Function->getLexicalDeclContext());
}
if (ForConstraintInstantiation && Function->getFriendObjectKind())
return Response::ChangeDecl(Function->getLexicalDeclContext());
return Response::UseNextDecl(Function);
}
Response HandleFunctionTemplateDecl(Sema &SemaRef,
const FunctionTemplateDecl *FTD,
MultiLevelTemplateArgumentList &Result) {
if (!isa<ClassTemplateSpecializationDecl>(FTD->getDeclContext())) {
Result.addOuterTemplateArguments(
const_cast<FunctionTemplateDecl *>(FTD),
const_cast<FunctionTemplateDecl *>(FTD)->getInjectedTemplateArgs(
SemaRef.Context),
/*Final=*/false);
NestedNameSpecifier *NNS = FTD->getTemplatedDecl()->getQualifier();
while (const Type *Ty = NNS ? NNS->getAsType() : nullptr) {
if (NNS->isInstantiationDependent()) {
if (const auto *TSTy = Ty->getAs<TemplateSpecializationType>()) {
ArrayRef<TemplateArgument> Arguments = TSTy->template_arguments();
// Prefer template arguments from the injected-class-type if possible.
// For example,
// ```cpp
// template <class... Pack> struct S {
// template <class T> void foo();
// };
// template <class... Pack> template <class T>
// ^^^^^^^^^^^^^ InjectedTemplateArgs
// They're of kind TemplateArgument::Pack, not of
// TemplateArgument::Type.
// void S<Pack...>::foo() {}
// ^^^^^^^
// TSTy->template_arguments() (which are of PackExpansionType)
// ```
// This meets the contract in
// TreeTransform::TryExpandParameterPacks that the template arguments
// for unexpanded parameters should be of a Pack kind.
if (TSTy->isCurrentInstantiation()) {
auto *RD = TSTy->getCanonicalTypeInternal()->getAsCXXRecordDecl();
if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate())
Arguments = CTD->getInjectedTemplateArgs(SemaRef.Context);
else if (auto *Specialization =
dyn_cast<ClassTemplateSpecializationDecl>(RD))
Arguments =
Specialization->getTemplateInstantiationArgs().asArray();
}
Result.addOuterTemplateArguments(
TSTy->getTemplateName().getAsTemplateDecl(), Arguments,
/*Final=*/false);
}
}
NNS = NNS->getPrefix();
}
}
return Response::ChangeDecl(FTD->getLexicalDeclContext());
}
Response HandleRecordDecl(Sema &SemaRef, const CXXRecordDecl *Rec,
MultiLevelTemplateArgumentList &Result,
ASTContext &Context,
bool ForConstraintInstantiation) {
if (ClassTemplateDecl *ClassTemplate = Rec->getDescribedClassTemplate()) {
assert(
(ForConstraintInstantiation || Result.getNumSubstitutedLevels() == 0) &&
"Outer template not instantiated?");
if (ClassTemplate->isMemberSpecialization())
return Response::Done();
if (ForConstraintInstantiation)
Result.addOuterTemplateArguments(
const_cast<CXXRecordDecl *>(Rec),
ClassTemplate->getInjectedTemplateArgs(SemaRef.Context),
/*Final=*/false);
}
if (const MemberSpecializationInfo *MSInfo =
Rec->getMemberSpecializationInfo())
if (MSInfo->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
return Response::Done();
bool IsFriend = Rec->getFriendObjectKind() ||
(Rec->getDescribedClassTemplate() &&
Rec->getDescribedClassTemplate()->getFriendObjectKind());
if (ForConstraintInstantiation && IsFriend &&
Rec->getNonTransparentDeclContext()->isFileContext()) {
return Response::ChangeDecl(Rec->getLexicalDeclContext());
}
// This is to make sure we pick up the VarTemplateSpecializationDecl or the
// TypeAliasTemplateDecl that this lambda is defined inside of.
if (Rec->isLambda()) {
if (const Decl *LCD = Rec->getLambdaContextDecl())
return Response::ChangeDecl(LCD);
// Retrieve the template arguments for a using alias declaration.
// This is necessary for constraint checking, since we always keep
// constraints relative to the primary template.
if (auto TypeAlias = getEnclosingTypeAliasTemplateDecl(SemaRef);
ForConstraintInstantiation && TypeAlias) {
if (isLambdaEnclosedByTypeAliasDecl(Rec->getLambdaCallOperator(),
TypeAlias.PrimaryTypeAliasDecl)) {
Result.addOuterTemplateArguments(TypeAlias.Template,
TypeAlias.AssociatedTemplateArguments,
/*Final=*/false);
// Visit the parent of the current type alias declaration rather than
// the lambda thereof.
// E.g., in the following example:
// struct S {
// template <class> using T = decltype([]<Concept> {} ());
// };
// void foo() {
// S::T var;
// }
// The instantiated lambda expression (which we're visiting at 'var')
// has a function DeclContext 'foo' rather than the Record DeclContext
// S. This seems to be an oversight to me that we may want to set a
// Sema Context from the CXXScopeSpec before substituting into T.
return Response::ChangeDecl(TypeAlias.Template->getDeclContext());
}
}
}
return Response::UseNextDecl(Rec);
}
Response HandleImplicitConceptSpecializationDecl(
const ImplicitConceptSpecializationDecl *CSD,
MultiLevelTemplateArgumentList &Result) {
Result.addOuterTemplateArguments(
const_cast<ImplicitConceptSpecializationDecl *>(CSD),
CSD->getTemplateArguments(),
/*Final=*/false);
return Response::UseNextDecl(CSD);
}
Response HandleGenericDeclContext(const Decl *CurDecl) {
return Response::UseNextDecl(CurDecl);
}
} // namespace TemplateInstArgsHelpers
} // namespace
MultiLevelTemplateArgumentList Sema::getTemplateInstantiationArgs(
const NamedDecl *ND, const DeclContext *DC, bool Final,
std::optional<ArrayRef<TemplateArgument>> Innermost, bool RelativeToPrimary,
const FunctionDecl *Pattern, bool ForConstraintInstantiation,
bool SkipForSpecialization, bool ForDefaultArgumentSubstitution) {
assert((ND || DC) && "Can't find arguments for a decl if one isn't provided");
// Accumulate the set of template argument lists in this structure.
MultiLevelTemplateArgumentList Result;
using namespace TemplateInstArgsHelpers;
const Decl *CurDecl = ND;
if (Innermost) {
Result.addOuterTemplateArguments(const_cast<NamedDecl *>(ND), *Innermost,
Final);
// Populate placeholder template arguments for TemplateTemplateParmDecls.
// This is essential for the case e.g.
//
// template <class> concept Concept = false;
// template <template <Concept C> class T> void foo(T<int>)
//
// where parameter C has a depth of 1 but the substituting argument `int`
// has a depth of 0.
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(CurDecl))
HandleDefaultTempArgIntoTempTempParam(TTP, Result);
CurDecl = DC ? Decl::castFromDeclContext(DC)
: Response::UseNextDecl(CurDecl).NextDecl;
} else if (!CurDecl)
CurDecl = Decl::castFromDeclContext(DC);
while (!CurDecl->isFileContextDecl()) {
Response R;
if (const auto *VarTemplSpec =
dyn_cast<VarTemplateSpecializationDecl>(CurDecl)) {
R = HandleVarTemplateSpec(VarTemplSpec, Result, SkipForSpecialization);
} else if (const auto *PartialClassTemplSpec =
dyn_cast<ClassTemplatePartialSpecializationDecl>(CurDecl)) {
R = HandlePartialClassTemplateSpec(PartialClassTemplSpec, Result,
SkipForSpecialization);
} else if (const auto *ClassTemplSpec =
dyn_cast<ClassTemplateSpecializationDecl>(CurDecl)) {
R = HandleClassTemplateSpec(ClassTemplSpec, Result,
SkipForSpecialization);
} else if (const auto *Function = dyn_cast<FunctionDecl>(CurDecl)) {
R = HandleFunction(*this, Function, Result, Pattern, RelativeToPrimary,
ForConstraintInstantiation,
ForDefaultArgumentSubstitution);
} else if (const auto *Rec = dyn_cast<CXXRecordDecl>(CurDecl)) {
R = HandleRecordDecl(*this, Rec, Result, Context,
ForConstraintInstantiation);
} else if (const auto *CSD =
dyn_cast<ImplicitConceptSpecializationDecl>(CurDecl)) {
R = HandleImplicitConceptSpecializationDecl(CSD, Result);
} else if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(CurDecl)) {
R = HandleFunctionTemplateDecl(*this, FTD, Result);
} else if (const auto *CTD = dyn_cast<ClassTemplateDecl>(CurDecl)) {
R = Response::ChangeDecl(CTD->getLexicalDeclContext());
} else if (!isa<DeclContext>(CurDecl)) {
R = Response::DontClearRelativeToPrimaryNextDecl(CurDecl);
if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(CurDecl)) {
R = HandleDefaultTempArgIntoTempTempParam(TTP, Result);
}
} else {
R = HandleGenericDeclContext(CurDecl);
}
if (R.IsDone)
return Result;
if (R.ClearRelativeToPrimary)
RelativeToPrimary = false;
assert(R.NextDecl);
CurDecl = R.NextDecl;
}
return Result;
}
bool Sema::CodeSynthesisContext::isInstantiationRecord() const {
switch (Kind) {
case TemplateInstantiation:
case ExceptionSpecInstantiation:
case DefaultTemplateArgumentInstantiation:
case DefaultFunctionArgumentInstantiation:
case ExplicitTemplateArgumentSubstitution:
case DeducedTemplateArgumentSubstitution:
case PriorTemplateArgumentSubstitution:
case ConstraintsCheck:
case NestedRequirementConstraintsCheck:
return true;
case RequirementInstantiation:
case RequirementParameterInstantiation:
case DefaultTemplateArgumentChecking:
case DeclaringSpecialMember:
case DeclaringImplicitEqualityComparison:
case DefiningSynthesizedFunction:
case ExceptionSpecEvaluation:
case ConstraintSubstitution:
case ParameterMappingSubstitution:
case ConstraintNormalization:
case RewritingOperatorAsSpaceship:
case InitializingStructuredBinding:
case MarkingClassDllexported:
case BuildingBuiltinDumpStructCall:
case LambdaExpressionSubstitution:
case BuildingDeductionGuides:
case TypeAliasTemplateInstantiation:
case PartialOrderingTTP:
return false;
// This function should never be called when Kind's value is Memoization.
case Memoization:
break;
}
llvm_unreachable("Invalid SynthesisKind!");
}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
Decl *Entity, NamedDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo *DeductionInfo)
: SemaRef(SemaRef) {
// Don't allow further instantiation if a fatal error and an uncompilable
// error have occurred. Any diagnostics we might have raised will not be
// visible, and we do not need to construct a correct AST.
if (SemaRef.Diags.hasFatalErrorOccurred() &&
SemaRef.hasUncompilableErrorOccurred()) {
Invalid = true;
return;
}
Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange);
if (!Invalid) {
CodeSynthesisContext Inst;
Inst.Kind = Kind;
Inst.PointOfInstantiation = PointOfInstantiation;
Inst.Entity = Entity;
Inst.Template = Template;
Inst.TemplateArgs = TemplateArgs.data();
Inst.NumTemplateArgs = TemplateArgs.size();
Inst.DeductionInfo = DeductionInfo;
Inst.InstantiationRange = InstantiationRange;
SemaRef.pushCodeSynthesisContext(Inst);
AlreadyInstantiating = !Inst.Entity ? false :
!SemaRef.InstantiatingSpecializations
.insert({Inst.Entity->getCanonicalDecl(), Inst.Kind})
.second;
atTemplateBegin(SemaRef.TemplateInstCallbacks, SemaRef, Inst);
}
}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, Decl *Entity,
SourceRange InstantiationRange)
: InstantiatingTemplate(SemaRef,
CodeSynthesisContext::TemplateInstantiation,
PointOfInstantiation, InstantiationRange, Entity) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, FunctionDecl *Entity,
ExceptionSpecification, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::ExceptionSpecInstantiation,
PointOfInstantiation, InstantiationRange, Entity) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateParameter Param,
TemplateDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::DefaultTemplateArgumentInstantiation,
PointOfInstantiation, InstantiationRange, getAsNamedDecl(Param),
Template, TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
FunctionTemplateDecl *FunctionTemplate,
ArrayRef<TemplateArgument> TemplateArgs,
CodeSynthesisContext::SynthesisKind Kind,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: InstantiatingTemplate(SemaRef, Kind, PointOfInstantiation,
InstantiationRange, FunctionTemplate, nullptr,
TemplateArgs, &DeductionInfo) {
assert(Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution ||
Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution ||
Kind == CodeSynthesisContext::BuildingDeductionGuides);
}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
TemplateDecl *Template,
ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange, Template, nullptr,
TemplateArgs, &DeductionInfo) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
ClassTemplatePartialSpecializationDecl *PartialSpec,
ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
TemplateArgs, &DeductionInfo) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
VarTemplatePartialSpecializationDecl *PartialSpec,
ArrayRef<TemplateArgument> TemplateArgs,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
TemplateArgs, &DeductionInfo) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, ParmVarDecl *Param,
ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::DefaultFunctionArgumentInstantiation,
PointOfInstantiation, InstantiationRange, Param, nullptr,
TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
NonTypeTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::PriorTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange, Param, Template,
TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
TemplateTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef,
CodeSynthesisContext::PriorTemplateArgumentSubstitution,
PointOfInstantiation, InstantiationRange, Param, Template,
TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
TypeAliasTemplateDecl *Entity, ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::TypeAliasTemplateInstantiation,
PointOfInstantiation, InstantiationRange, /*Entity=*/Entity,
/*Template=*/nullptr, TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateDecl *Template,
NamedDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::DefaultTemplateArgumentChecking,
PointOfInstantiation, InstantiationRange, Param, Template,
TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
concepts::Requirement *Req, sema::TemplateDeductionInfo &DeductionInfo,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::RequirementInstantiation,
PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
/*Template=*/nullptr, /*TemplateArgs=*/{}, &DeductionInfo) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
concepts::NestedRequirement *Req, ConstraintsCheck,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::NestedRequirementConstraintsCheck,
PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
/*Template=*/nullptr, /*TemplateArgs=*/{}) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, const RequiresExpr *RE,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::RequirementParameterInstantiation,
PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
/*Template=*/nullptr, /*TemplateArgs=*/{}, &DeductionInfo) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
ConstraintsCheck, NamedDecl *Template,
ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::ConstraintsCheck,
PointOfInstantiation, InstantiationRange, Template, nullptr,
TemplateArgs) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
ConstraintSubstitution, NamedDecl *Template,
sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::ConstraintSubstitution,
PointOfInstantiation, InstantiationRange, Template, nullptr,
{}, &DeductionInfo) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
ConstraintNormalization, NamedDecl *Template,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::ConstraintNormalization,
PointOfInstantiation, InstantiationRange, Template) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation,
ParameterMappingSubstitution, NamedDecl *Template,
SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::ParameterMappingSubstitution,
PointOfInstantiation, InstantiationRange, Template) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateDecl *Entity,
BuildingDeductionGuidesTag, SourceRange InstantiationRange)
: InstantiatingTemplate(
SemaRef, CodeSynthesisContext::BuildingDeductionGuides,
PointOfInstantiation, InstantiationRange, Entity) {}
Sema::InstantiatingTemplate::InstantiatingTemplate(
Sema &SemaRef, SourceLocation ArgLoc, PartialOrderingTTP,
TemplateDecl *PArg, SourceRange InstantiationRange)
: InstantiatingTemplate(SemaRef, CodeSynthesisContext::PartialOrderingTTP,
ArgLoc, InstantiationRange, PArg) {}
void Sema::pushCodeSynthesisContext(CodeSynthesisContext Ctx) {
Ctx.SavedInNonInstantiationSFINAEContext = InNonInstantiationSFINAEContext;
InNonInstantiationSFINAEContext = false;
CodeSynthesisContexts.push_back(Ctx);
if (!Ctx.isInstantiationRecord())
++NonInstantiationEntries;
// Check to see if we're low on stack space. We can't do anything about this
// from here, but we can at least warn the user.
StackHandler.warnOnStackNearlyExhausted(Ctx.PointOfInstantiation);
}
void Sema::popCodeSynthesisContext() {
auto &Active = CodeSynthesisContexts.back();
if (!Active.isInstantiationRecord()) {
assert(NonInstantiationEntries > 0);
--NonInstantiationEntries;
}
InNonInstantiationSFINAEContext = Active.SavedInNonInstantiationSFINAEContext;
// Name lookup no longer looks in this template's defining module.
assert(CodeSynthesisContexts.size() >=
CodeSynthesisContextLookupModules.size() &&
"forgot to remove a lookup module for a template instantiation");
if (CodeSynthesisContexts.size() ==
CodeSynthesisContextLookupModules.size()) {
if (Module *M = CodeSynthesisContextLookupModules.back())
LookupModulesCache.erase(M);
CodeSynthesisContextLookupModules.pop_back();
}
// If we've left the code synthesis context for the current context stack,
// stop remembering that we've emitted that stack.
if (CodeSynthesisContexts.size() ==
LastEmittedCodeSynthesisContextDepth)
LastEmittedCodeSynthesisContextDepth = 0;
CodeSynthesisContexts.pop_back();
}
void Sema::InstantiatingTemplate::Clear() {
if (!Invalid) {
if (!AlreadyInstantiating) {
auto &Active = SemaRef.CodeSynthesisContexts.back();
if (Active.Entity)
SemaRef.InstantiatingSpecializations.erase(
{Active.Entity->getCanonicalDecl(), Active.Kind});
}
atTemplateEnd(SemaRef.TemplateInstCallbacks, SemaRef,
SemaRef.CodeSynthesisContexts.back());
SemaRef.popCodeSynthesisContext();
Invalid = true;
}
}
static std::string convertCallArgsToString(Sema &S,
llvm::ArrayRef<const Expr *> Args) {
std::string Result;
llvm::raw_string_ostream OS(Result);
llvm::ListSeparator Comma;
for (const Expr *Arg : Args) {
OS << Comma;
Arg->IgnoreParens()->printPretty(OS, nullptr,
S.Context.getPrintingPolicy());
}
return Result;
}
bool Sema::InstantiatingTemplate::CheckInstantiationDepth(
SourceLocation PointOfInstantiation,
SourceRange InstantiationRange) {
assert(SemaRef.NonInstantiationEntries <=
SemaRef.CodeSynthesisContexts.size());
if ((SemaRef.CodeSynthesisContexts.size() -
SemaRef.NonInstantiationEntries)
<= SemaRef.getLangOpts().InstantiationDepth)
return false;
SemaRef.Diag(PointOfInstantiation,
diag::err_template_recursion_depth_exceeded)
<< SemaRef.getLangOpts().InstantiationDepth
<< InstantiationRange;
SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth)
<< SemaRef.getLangOpts().InstantiationDepth;
return true;
}
void Sema::PrintInstantiationStack(InstantiationContextDiagFuncRef DiagFunc) {
// Determine which template instantiations to skip, if any.
unsigned SkipStart = CodeSynthesisContexts.size(), SkipEnd = SkipStart;
unsigned Limit = Diags.getTemplateBacktraceLimit();
if (Limit && Limit < CodeSynthesisContexts.size()) {
SkipStart = Limit / 2 + Limit % 2;
SkipEnd = CodeSynthesisContexts.size() - Limit / 2;
}
// FIXME: In all of these cases, we need to show the template arguments
unsigned InstantiationIdx = 0;
for (SmallVectorImpl<CodeSynthesisContext>::reverse_iterator
Active = CodeSynthesisContexts.rbegin(),
ActiveEnd = CodeSynthesisContexts.rend();
Active != ActiveEnd;
++Active, ++InstantiationIdx) {
// Skip this instantiation?
if (InstantiationIdx >= SkipStart && InstantiationIdx < SkipEnd) {
if (InstantiationIdx == SkipStart) {
// Note that we're skipping instantiations.
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_instantiation_contexts_suppressed)
<< unsigned(CodeSynthesisContexts.size() - Limit));
}
continue;
}
switch (Active->Kind) {
case CodeSynthesisContext::TemplateInstantiation: {
Decl *D = Active->Entity;
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
unsigned DiagID = diag::note_template_member_class_here;
if (isa<ClassTemplateSpecializationDecl>(Record))
DiagID = diag::note_template_class_instantiation_here;
DiagFunc(Active->PointOfInstantiation,
PDiag(DiagID) << Record << Active->InstantiationRange);
} else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
unsigned DiagID;
if (Function->getPrimaryTemplate())
DiagID = diag::note_function_template_spec_here;
else
DiagID = diag::note_template_member_function_here;
DiagFunc(Active->PointOfInstantiation,
PDiag(DiagID) << Function << Active->InstantiationRange);
} else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
DiagFunc(Active->PointOfInstantiation,
PDiag(VD->isStaticDataMember()
? diag::note_template_static_data_member_def_here
: diag::note_template_variable_def_here)
<< VD << Active->InstantiationRange);
} else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_enum_def_here)
<< ED << Active->InstantiationRange);
} else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_nsdmi_here)
<< FD << Active->InstantiationRange);
} else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(D)) {
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_class_instantiation_here)
<< CTD << Active->InstantiationRange);
}
break;
}
case CodeSynthesisContext::DefaultTemplateArgumentInstantiation: {
TemplateDecl *Template = cast<TemplateDecl>(Active->Template);
SmallString<128> TemplateArgsStr;
llvm::raw_svector_ostream OS(TemplateArgsStr);
Template->printName(OS, getPrintingPolicy());
printTemplateArgumentList(OS, Active->template_arguments(),
getPrintingPolicy());
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_default_arg_instantiation_here)
<< OS.str() << Active->InstantiationRange);
break;
}
case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution: {
FunctionTemplateDecl *FnTmpl = cast<FunctionTemplateDecl>(Active->Entity);
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_explicit_template_arg_substitution_here)
<< FnTmpl
<< getTemplateArgumentBindingsText(
FnTmpl->getTemplateParameters(), Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange);
break;
}
case CodeSynthesisContext::DeducedTemplateArgumentSubstitution: {
if (FunctionTemplateDecl *FnTmpl =
dyn_cast<FunctionTemplateDecl>(Active->Entity)) {
DiagFunc(
Active->PointOfInstantiation,
PDiag(diag::note_function_template_deduction_instantiation_here)
<< FnTmpl
<< getTemplateArgumentBindingsText(
FnTmpl->getTemplateParameters(), Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange);
} else {
bool IsVar = isa<VarTemplateDecl>(Active->Entity) ||
isa<VarTemplateSpecializationDecl>(Active->Entity);
bool IsTemplate = false;
TemplateParameterList *Params;
if (auto *D = dyn_cast<TemplateDecl>(Active->Entity)) {
IsTemplate = true;
Params = D->getTemplateParameters();
} else if (auto *D = dyn_cast<ClassTemplatePartialSpecializationDecl>(
Active->Entity)) {
Params = D->getTemplateParameters();
} else if (auto *D = dyn_cast<VarTemplatePartialSpecializationDecl>(
Active->Entity)) {
Params = D->getTemplateParameters();
} else {
llvm_unreachable("unexpected template kind");
}
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_deduced_template_arg_substitution_here)
<< IsVar << IsTemplate << cast<NamedDecl>(Active->Entity)
<< getTemplateArgumentBindingsText(Params,
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange);
}
break;
}
case CodeSynthesisContext::DefaultFunctionArgumentInstantiation: {
ParmVarDecl *Param = cast<ParmVarDecl>(Active->Entity);
FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext());
SmallString<128> TemplateArgsStr;
llvm::raw_svector_ostream OS(TemplateArgsStr);
FD->printName(OS, getPrintingPolicy());
printTemplateArgumentList(OS, Active->template_arguments(),
getPrintingPolicy());
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_default_function_arg_instantiation_here)
<< OS.str() << Active->InstantiationRange);
break;
}
case CodeSynthesisContext::PriorTemplateArgumentSubstitution: {
NamedDecl *Parm = cast<NamedDecl>(Active->Entity);
std::string Name;
if (!Parm->getName().empty())
Name = std::string(" '") + Parm->getName().str() + "'";
TemplateParameterList *TemplateParams = nullptr;
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
TemplateParams = Template->getTemplateParameters();
else
TemplateParams =
cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
->getTemplateParameters();
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_prior_template_arg_substitution)
<< isa<TemplateTemplateParmDecl>(Parm) << Name
<< getTemplateArgumentBindingsText(TemplateParams,
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange);
break;
}
case CodeSynthesisContext::DefaultTemplateArgumentChecking: {
TemplateParameterList *TemplateParams = nullptr;
if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
TemplateParams = Template->getTemplateParameters();
else
TemplateParams =
cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
->getTemplateParameters();
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_default_arg_checking)
<< getTemplateArgumentBindingsText(TemplateParams,
Active->TemplateArgs,
Active->NumTemplateArgs)
<< Active->InstantiationRange);
break;
}
case CodeSynthesisContext::ExceptionSpecEvaluation:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_evaluating_exception_spec_here)
<< cast<FunctionDecl>(Active->Entity));
break;
case CodeSynthesisContext::ExceptionSpecInstantiation:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_exception_spec_instantiation_here)
<< cast<FunctionDecl>(Active->Entity)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::RequirementInstantiation:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_requirement_instantiation_here)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::RequirementParameterInstantiation:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_requirement_params_instantiation_here)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::NestedRequirementConstraintsCheck:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_nested_requirement_here)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::DeclaringSpecialMember:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_in_declaration_of_implicit_special_member)
<< cast<CXXRecordDecl>(Active->Entity)
<< llvm::to_underlying(Active->SpecialMember));
break;
case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
DiagFunc(
Active->Entity->getLocation(),
PDiag(diag::note_in_declaration_of_implicit_equality_comparison));
break;
case CodeSynthesisContext::DefiningSynthesizedFunction: {
// FIXME: For synthesized functions that are not defaulted,
// produce a note.
auto *FD = dyn_cast<FunctionDecl>(Active->Entity);
DefaultedFunctionKind DFK =
FD ? getDefaultedFunctionKind(FD) : DefaultedFunctionKind();
if (DFK.isSpecialMember()) {
auto *MD = cast<CXXMethodDecl>(FD);
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_member_synthesized_at)
<< MD->isExplicitlyDefaulted()
<< llvm::to_underlying(DFK.asSpecialMember())
<< Context.getTagDeclType(MD->getParent()));
} else if (DFK.isComparison()) {
QualType RecordType = FD->getParamDecl(0)
->getType()
.getNonReferenceType()
.getUnqualifiedType();
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_comparison_synthesized_at)
<< (int)DFK.asComparison() << RecordType);
}
break;
}
case CodeSynthesisContext::RewritingOperatorAsSpaceship:
DiagFunc(Active->Entity->getLocation(),
PDiag(diag::note_rewriting_operator_as_spaceship));
break;
case CodeSynthesisContext::InitializingStructuredBinding:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_in_binding_decl_init)
<< cast<BindingDecl>(Active->Entity));
break;
case CodeSynthesisContext::MarkingClassDllexported:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_due_to_dllexported_class)
<< cast<CXXRecordDecl>(Active->Entity)
<< !getLangOpts().CPlusPlus11);
break;
case CodeSynthesisContext::BuildingBuiltinDumpStructCall:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_building_builtin_dump_struct_call)
<< convertCallArgsToString(
*this, llvm::ArrayRef(Active->CallArgs,
Active->NumCallArgs)));
break;
case CodeSynthesisContext::Memoization:
break;
case CodeSynthesisContext::LambdaExpressionSubstitution:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_lambda_substitution_here));
break;
case CodeSynthesisContext::ConstraintsCheck: {
unsigned DiagID = 0;
if (!Active->Entity) {
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_nested_requirement_here)
<< Active->InstantiationRange);
break;
}
if (isa<ConceptDecl>(Active->Entity))
DiagID = diag::note_concept_specialization_here;
else if (isa<TemplateDecl>(Active->Entity))
DiagID = diag::note_checking_constraints_for_template_id_here;
else if (isa<VarTemplatePartialSpecializationDecl>(Active->Entity))
DiagID = diag::note_checking_constraints_for_var_spec_id_here;
else if (isa<ClassTemplatePartialSpecializationDecl>(Active->Entity))
DiagID = diag::note_checking_constraints_for_class_spec_id_here;
else {
assert(isa<FunctionDecl>(Active->Entity));
DiagID = diag::note_checking_constraints_for_function_here;
}
SmallString<128> TemplateArgsStr;
llvm::raw_svector_ostream OS(TemplateArgsStr);
cast<NamedDecl>(Active->Entity)->printName(OS, getPrintingPolicy());
if (!isa<FunctionDecl>(Active->Entity)) {
printTemplateArgumentList(OS, Active->template_arguments(),
getPrintingPolicy());
}
DiagFunc(Active->PointOfInstantiation,
PDiag(DiagID) << OS.str() << Active->InstantiationRange);
break;
}
case CodeSynthesisContext::ConstraintSubstitution:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_constraint_substitution_here)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::ConstraintNormalization:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_constraint_normalization_here)
<< cast<NamedDecl>(Active->Entity)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::ParameterMappingSubstitution:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_parameter_mapping_substitution_here)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::BuildingDeductionGuides:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_building_deduction_guide_here));
break;
case CodeSynthesisContext::TypeAliasTemplateInstantiation:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_type_alias_instantiation_here)
<< cast<TypeAliasTemplateDecl>(Active->Entity)
<< Active->InstantiationRange);
break;
case CodeSynthesisContext::PartialOrderingTTP:
DiagFunc(Active->PointOfInstantiation,
PDiag(diag::note_template_arg_template_params_mismatch));
if (SourceLocation ParamLoc = Active->Entity->getLocation();
ParamLoc.isValid())
DiagFunc(ParamLoc, PDiag(diag::note_template_prev_declaration)
<< /*isTemplateTemplateParam=*/true
<< Active->InstantiationRange);
break;
}
}
}
std::optional<TemplateDeductionInfo *> Sema::isSFINAEContext() const {
if (InNonInstantiationSFINAEContext)
return std::optional<TemplateDeductionInfo *>(nullptr);
for (SmallVectorImpl<CodeSynthesisContext>::const_reverse_iterator
Active = CodeSynthesisContexts.rbegin(),
ActiveEnd = CodeSynthesisContexts.rend();
Active != ActiveEnd;
++Active)
{
switch (Active->Kind) {
case CodeSynthesisContext::TypeAliasTemplateInstantiation:
// An instantiation of an alias template may or may not be a SFINAE
// context, depending on what else is on the stack.
if (isa<TypeAliasTemplateDecl>(Active->Entity))
break;
[[fallthrough]];
case CodeSynthesisContext::TemplateInstantiation:
case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
case CodeSynthesisContext::ExceptionSpecInstantiation:
case CodeSynthesisContext::ConstraintsCheck:
case CodeSynthesisContext::ParameterMappingSubstitution:
case CodeSynthesisContext::ConstraintNormalization:
case CodeSynthesisContext::NestedRequirementConstraintsCheck:
// This is a template instantiation, so there is no SFINAE.
return std::nullopt;
case CodeSynthesisContext::LambdaExpressionSubstitution:
// [temp.deduct]p9
// A lambda-expression appearing in a function type or a template
// parameter is not considered part of the immediate context for the
// purposes of template argument deduction.
// CWG2672: A lambda-expression body is never in the immediate context.
return std::nullopt;
case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
case CodeSynthesisContext::DefaultTemplateArgumentChecking:
case CodeSynthesisContext::RewritingOperatorAsSpaceship:
case CodeSynthesisContext::PartialOrderingTTP:
// A default template argument instantiation and substitution into
// template parameters with arguments for prior parameters may or may
// not be a SFINAE context; look further up the stack.
break;
case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
// We're either substituting explicitly-specified template arguments,
// deduced template arguments. SFINAE applies unless we are in a lambda
// body, see [temp.deduct]p9.
case CodeSynthesisContext::ConstraintSubstitution:
case CodeSynthesisContext::RequirementInstantiation:
case CodeSynthesisContext::RequirementParameterInstantiation:
// SFINAE always applies in a constraint expression or a requirement
// in a requires expression.
assert(Active->DeductionInfo && "Missing deduction info pointer");
return Active->DeductionInfo;
case CodeSynthesisContext::DeclaringSpecialMember:
case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
case CodeSynthesisContext::DefiningSynthesizedFunction:
case CodeSynthesisContext::InitializingStructuredBinding:
case CodeSynthesisContext::MarkingClassDllexported:
case CodeSynthesisContext::BuildingBuiltinDumpStructCall:
case CodeSynthesisContext::BuildingDeductionGuides:
// This happens in a context unrelated to template instantiation, so
// there is no SFINAE.
return std::nullopt;
case CodeSynthesisContext::ExceptionSpecEvaluation:
// FIXME: This should not be treated as a SFINAE context, because
// we will cache an incorrect exception specification. However, clang
// bootstrap relies this! See PR31692.
break;
case CodeSynthesisContext::Memoization:
break;
}
// The inner context was transparent for SFINAE. If it occurred within a
// non-instantiation SFINAE context, then SFINAE applies.
if (Active->SavedInNonInstantiationSFINAEContext)
return std::optional<TemplateDeductionInfo *>(nullptr);
}
return std::nullopt;
}
static TemplateArgument
getPackSubstitutedTemplateArgument(Sema &S, TemplateArgument Arg) {
assert(S.ArgPackSubstIndex);
assert(*S.ArgPackSubstIndex < Arg.pack_size());
Arg = Arg.pack_begin()[*S.ArgPackSubstIndex];
if (Arg.isPackExpansion())
Arg = Arg.getPackExpansionPattern();
return Arg;
}
//===----------------------------------------------------------------------===/
// Template Instantiation for Types
//===----------------------------------------------------------------------===/
namespace {
class TemplateInstantiator : public TreeTransform<TemplateInstantiator> {
const MultiLevelTemplateArgumentList &TemplateArgs;
SourceLocation Loc;
DeclarationName Entity;
// Whether to evaluate the C++20 constraints or simply substitute into them.
bool EvaluateConstraints = true;
// Whether Substitution was Incomplete, that is, we tried to substitute in
// any user provided template arguments which were null.
bool IsIncomplete = false;
// Whether an incomplete substituion should be treated as an error.
bool BailOutOnIncomplete;
public:
typedef TreeTransform<TemplateInstantiator> inherited;
TemplateInstantiator(Sema &SemaRef,
const MultiLevelTemplateArgumentList &TemplateArgs,
SourceLocation Loc, DeclarationName Entity,
bool BailOutOnIncomplete = false)
: inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc),
Entity(Entity), BailOutOnIncomplete(BailOutOnIncomplete) {}
void setEvaluateConstraints(bool B) {
EvaluateConstraints = B;
}
bool getEvaluateConstraints() {
return EvaluateConstraints;
}
/// Determine whether the given type \p T has already been
/// transformed.
///
/// For the purposes of template instantiation, a type has already been
/// transformed if it is NULL or if it is not dependent.
bool AlreadyTransformed(QualType T);
/// Returns the location of the entity being instantiated, if known.
SourceLocation getBaseLocation() { return Loc; }
/// Returns the name of the entity being instantiated, if any.
DeclarationName getBaseEntity() { return Entity; }
/// Returns whether any substitution so far was incomplete.
bool getIsIncomplete() const { return IsIncomplete; }
/// Sets the "base" location and entity when that
/// information is known based on another transformation.
void setBase(SourceLocation Loc, DeclarationName Entity) {
this->Loc = Loc;
this->Entity = Entity;
}
unsigned TransformTemplateDepth(unsigned Depth) {
return TemplateArgs.getNewDepth(Depth);
}
UnsignedOrNone getPackIndex(TemplateArgument Pack) {
UnsignedOrNone Index = getSema().ArgPackSubstIndex;
if (!Index)
return std::nullopt;
return Pack.pack_size() - 1 - *Index;
}
bool TryExpandParameterPacks(SourceLocation EllipsisLoc,
SourceRange PatternRange,
ArrayRef<UnexpandedParameterPack> Unexpanded,
bool &ShouldExpand, bool &RetainExpansion,
UnsignedOrNone &NumExpansions) {
return getSema().CheckParameterPacksForExpansion(EllipsisLoc,
PatternRange, Unexpanded,
TemplateArgs,
ShouldExpand,
RetainExpansion,
NumExpansions);
}
void ExpandingFunctionParameterPack(ParmVarDecl *Pack) {
SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Pack);
}
TemplateArgument ForgetPartiallySubstitutedPack() {
TemplateArgument Result;
if (NamedDecl *PartialPack
= SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
MultiLevelTemplateArgumentList &TemplateArgs
= const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
unsigned Depth, Index;
std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
if (TemplateArgs.hasTemplateArgument(Depth, Index)) {
Result = TemplateArgs(Depth, Index);
TemplateArgs.setArgument(Depth, Index, TemplateArgument());
} else {
IsIncomplete = true;
if (BailOutOnIncomplete)
return TemplateArgument();
}
}
return Result;
}
void RememberPartiallySubstitutedPack(TemplateArgument Arg) {
if (Arg.isNull())
return;
if (NamedDecl *PartialPack
= SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
MultiLevelTemplateArgumentList &TemplateArgs
= const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
unsigned Depth, Index;
std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
TemplateArgs.setArgument(Depth, Index, Arg);
}
}
TemplateArgument
getTemplateArgumentPackPatternForRewrite(const TemplateArgument &TA) {
if (TA.getKind() != TemplateArgument::Pack)
return TA;
if (SemaRef.ArgPackSubstIndex)
return getPackSubstitutedTemplateArgument(SemaRef, TA);
assert(TA.pack_size() == 1 && TA.pack_begin()->isPackExpansion() &&
"unexpected pack arguments in template rewrite");
TemplateArgument Arg = *TA.pack_begin();
if (Arg.isPackExpansion())
Arg = Arg.getPackExpansionPattern();
return Arg;
}
/// Transform the given declaration by instantiating a reference to
/// this declaration.
Decl *TransformDecl(SourceLocation Loc, Decl *D);
void transformAttrs(Decl *Old, Decl *New) {
SemaRef.InstantiateAttrs(TemplateArgs, Old, New);
}
void transformedLocalDecl(Decl *Old, ArrayRef<Decl *> NewDecls) {
if (Old->isParameterPack() &&
(NewDecls.size() != 1 || !NewDecls.front()->isParameterPack())) {
SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Old);
for (auto *New : NewDecls)
SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(
Old, cast<VarDecl>(New));
return;
}
assert(NewDecls.size() == 1 &&
"should only have multiple expansions for a pack");
Decl *New = NewDecls.front();
// If we've instantiated the call operator of a lambda or the call
// operator template of a generic lambda, update the "instantiation of"
// information.
auto *NewMD = dyn_cast<CXXMethodDecl>(New);
if (NewMD && isLambdaCallOperator(NewMD)) {
auto *OldMD = dyn_cast<CXXMethodDecl>(Old);
if (auto *NewTD = NewMD->getDescribedFunctionTemplate())
NewTD->setInstantiatedFromMemberTemplate(
OldMD->getDescribedFunctionTemplate());
else
NewMD->setInstantiationOfMemberFunction(OldMD,
TSK_ImplicitInstantiation);
}
SemaRef.CurrentInstantiationScope->InstantiatedLocal(Old, New);
// We recreated a local declaration, but not by instantiating it. There
// may be pending dependent diagnostics to produce.
if (auto *DC = dyn_cast<DeclContext>(Old);
DC && DC->isDependentContext() && DC->isFunctionOrMethod())
SemaRef.PerformDependentDiagnostics(DC, TemplateArgs);
}
/// Transform the definition of the given declaration by
/// instantiating it.
Decl *TransformDefinition(SourceLocation Loc, Decl *D);
/// Transform the first qualifier within a scope by instantiating the
/// declaration.
NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc);
bool TransformExceptionSpec(SourceLocation Loc,
FunctionProtoType::ExceptionSpecInfo &ESI,
SmallVectorImpl<QualType> &Exceptions,
bool &Changed);
/// Rebuild the exception declaration and register the declaration
/// as an instantiated local.
VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *Declarator,
SourceLocation StartLoc,
SourceLocation NameLoc,
IdentifierInfo *Name);
/// Rebuild the Objective-C exception declaration and register the
/// declaration as an instantiated local.
VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *TSInfo, QualType T);
/// Check for tag mismatches when instantiating an
/// elaborated type.
QualType RebuildElaboratedType(SourceLocation KeywordLoc,
ElaboratedTypeKeyword Keyword,
NestedNameSpecifierLoc QualifierLoc,
QualType T);
TemplateName
TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
SourceLocation NameLoc,
QualType ObjectType = QualType(),
NamedDecl *FirstQualifierInScope = nullptr,
bool AllowInjectedClassName = false);
const AnnotateAttr *TransformAnnotateAttr(const AnnotateAttr *AA);
const CXXAssumeAttr *TransformCXXAssumeAttr(const CXXAssumeAttr *AA);
const LoopHintAttr *TransformLoopHintAttr(const LoopHintAttr *LH);
const NoInlineAttr *TransformStmtNoInlineAttr(const Stmt *OrigS,
const Stmt *InstS,
const NoInlineAttr *A);
const AlwaysInlineAttr *
TransformStmtAlwaysInlineAttr(const Stmt *OrigS, const Stmt *InstS,
const AlwaysInlineAttr *A);
const CodeAlignAttr *TransformCodeAlignAttr(const CodeAlignAttr *CA);
const OpenACCRoutineDeclAttr *
TransformOpenACCRoutineDeclAttr(const OpenACCRoutineDeclAttr *A);
ExprResult TransformPredefinedExpr(PredefinedExpr *E);
ExprResult TransformDeclRefExpr(DeclRefExpr *E);
ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);
ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E,
NonTypeTemplateParmDecl *D);
ExprResult TransformSubstNonTypeTemplateParmPackExpr(
SubstNonTypeTemplateParmPackExpr *E);
ExprResult TransformSubstNonTypeTemplateParmExpr(
SubstNonTypeTemplateParmExpr *E);
/// Rebuild a DeclRefExpr for a VarDecl reference.
ExprResult RebuildVarDeclRefExpr(ValueDecl *PD, SourceLocation Loc);
/// Transform a reference to a function or init-capture parameter pack.
ExprResult TransformFunctionParmPackRefExpr(DeclRefExpr *E, ValueDecl *PD);
/// Transform a FunctionParmPackExpr which was built when we couldn't
/// expand a function parameter pack reference which refers to an expanded
/// pack.
ExprResult TransformFunctionParmPackExpr(FunctionParmPackExpr *E);
QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
FunctionProtoTypeLoc TL) {
// Call the base version; it will forward to our overridden version below.
return inherited::TransformFunctionProtoType(TLB, TL);
}
QualType TransformInjectedClassNameType(TypeLocBuilder &TLB,
InjectedClassNameTypeLoc TL) {
auto Type = inherited::TransformInjectedClassNameType(TLB, TL);
// Special case for transforming a deduction guide, we return a
// transformed TemplateSpecializationType.
if (Type.isNull() &&
SemaRef.CodeSynthesisContexts.back().Kind ==
Sema::CodeSynthesisContext::BuildingDeductionGuides) {
// Return a TemplateSpecializationType for transforming a deduction
// guide.
if (auto *ICT = TL.getType()->getAs<InjectedClassNameType>()) {
auto Type =
inherited::TransformType(ICT->getInjectedSpecializationType());
TLB.pushTrivial(SemaRef.Context, Type, TL.getNameLoc());
return Type;
}
}
return Type;
}
// Override the default version to handle a rewrite-template-arg-pack case
// for building a deduction guide.
bool TransformTemplateArgument(const TemplateArgumentLoc &Input,
TemplateArgumentLoc &Output,
bool Uneval = false) {
const TemplateArgument &Arg = Input.getArgument();
std::vector<TemplateArgument> TArgs;
switch (Arg.getKind()) {
case TemplateArgument::Pack:
assert(SemaRef.CodeSynthesisContexts.empty() ||
SemaRef.CodeSynthesisContexts.back().Kind ==
Sema::CodeSynthesisContext::BuildingDeductionGuides);
// Literally rewrite the template argument pack, instead of unpacking
// it.
for (auto &pack : Arg.getPackAsArray()) {
TemplateArgumentLoc Input = SemaRef.getTrivialTemplateArgumentLoc(
pack, QualType(), SourceLocation{});
TemplateArgumentLoc Output;
if (TransformTemplateArgument(Input, Output, Uneval))
return true; // fails
TArgs.push_back(Output.getArgument());
}
Output = SemaRef.getTrivialTemplateArgumentLoc(
TemplateArgument(llvm::ArrayRef(TArgs).copy(SemaRef.Context)),
QualType(), SourceLocation{});
return false;
default:
break;
}
return inherited::TransformTemplateArgument(Input, Output, Uneval);
}
UnsignedOrNone ComputeSizeOfPackExprWithoutSubstitution(
ArrayRef<TemplateArgument> PackArgs) {
// Don't do this when rewriting template parameters for CTAD:
// 1) The heuristic needs the unpacked Subst* nodes to figure out the
// expanded size, but this never applies since Subst* nodes are not
// created in rewrite scenarios.
//
// 2) The heuristic substitutes into the pattern with pack expansion
// suppressed, which does not meet the requirements for argument
// rewriting when template arguments include a non-pack matching against
// a pack, particularly when rewriting an alias CTAD.
if (TemplateArgs.isRewrite())
return std::nullopt;
return inherited::ComputeSizeOfPackExprWithoutSubstitution(PackArgs);
}
template<typename Fn>
QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
FunctionProtoTypeLoc TL,
CXXRecordDecl *ThisContext,
Qualifiers ThisTypeQuals,
Fn TransformExceptionSpec);
ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm,
int indexAdjustment,
UnsignedOrNone NumExpansions,
bool ExpectParameterPack);
using inherited::TransformTemplateTypeParmType;
/// Transforms a template type parameter type by performing
/// substitution of the corresponding template type argument.
QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB,
TemplateTypeParmTypeLoc TL,
bool SuppressObjCLifetime);
QualType BuildSubstTemplateTypeParmType(
TypeLocBuilder &TLB, bool SuppressObjCLifetime, bool Final,
Decl *AssociatedDecl, unsigned Index, UnsignedOrNone PackIndex,
TemplateArgument Arg, SourceLocation NameLoc);
/// Transforms an already-substituted template type parameter pack
/// into either itself (if we aren't substituting into its pack expansion)
/// or the appropriate substituted argument.
using inherited::TransformSubstTemplateTypeParmPackType;
QualType
TransformSubstTemplateTypeParmPackType(TypeLocBuilder &TLB,
SubstTemplateTypeParmPackTypeLoc TL,
bool SuppressObjCLifetime);
CXXRecordDecl::LambdaDependencyKind
ComputeLambdaDependency(LambdaScopeInfo *LSI) {
if (auto TypeAlias =
TemplateInstArgsHelpers::getEnclosingTypeAliasTemplateDecl(
getSema());
TypeAlias && TemplateInstArgsHelpers::isLambdaEnclosedByTypeAliasDecl(
LSI->CallOperator, TypeAlias.PrimaryTypeAliasDecl)) {
unsigned TypeAliasDeclDepth = TypeAlias.Template->getTemplateDepth();
if (TypeAliasDeclDepth >= TemplateArgs.getNumSubstitutedLevels())
return CXXRecordDecl::LambdaDependencyKind::LDK_AlwaysDependent;
for (const TemplateArgument &TA : TypeAlias.AssociatedTemplateArguments)
if (TA.isDependent())
return CXXRecordDecl::LambdaDependencyKind::LDK_AlwaysDependent;
}
return inherited::ComputeLambdaDependency(LSI);
}
ExprResult TransformLambdaExpr(LambdaExpr *E) {
// Do not rebuild lambdas to avoid creating a new type.
// Lambdas have already been processed inside their eval contexts.
if (SemaRef.RebuildingImmediateInvocation)
return E;
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true,
/*InstantiatingLambdaOrBlock=*/true);
Sema::ConstraintEvalRAII<TemplateInstantiator> RAII(*this);
return inherited::TransformLambdaExpr(E);
}
ExprResult TransformBlockExpr(BlockExpr *E) {
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true,
/*InstantiatingLambdaOrBlock=*/true);
return inherited::TransformBlockExpr(E);
}
ExprResult RebuildLambdaExpr(SourceLocation StartLoc, SourceLocation EndLoc,
LambdaScopeInfo *LSI) {
CXXMethodDecl *MD = LSI->CallOperator;
for (ParmVarDecl *PVD : MD->parameters()) {
assert(PVD && "null in a parameter list");
if (!PVD->hasDefaultArg())
continue;
Expr *UninstExpr = PVD->getUninstantiatedDefaultArg();
// FIXME: Obtain the source location for the '=' token.
SourceLocation EqualLoc = UninstExpr->getBeginLoc();
if (SemaRef.SubstDefaultArgument(EqualLoc, PVD, TemplateArgs)) {
// If substitution fails, the default argument is set to a
// RecoveryExpr that wraps the uninstantiated default argument so
// that downstream diagnostics are omitted.
ExprResult ErrorResult = SemaRef.CreateRecoveryExpr(
UninstExpr->getBeginLoc(), UninstExpr->getEndLoc(), {UninstExpr},
UninstExpr->getType());
if (ErrorResult.isUsable())
PVD->setDefaultArg(ErrorResult.get());
}
}
return inherited::RebuildLambdaExpr(StartLoc, EndLoc, LSI);
}
StmtResult TransformLambdaBody(LambdaExpr *E, Stmt *Body) {
// Currently, we instantiate the body when instantiating the lambda
// expression. However, `EvaluateConstraints` is disabled during the
// instantiation of the lambda expression, causing the instantiation
// failure of the return type requirement in the body. If p0588r1 is fully
// implemented, the body will be lazily instantiated, and this problem
// will not occur. Here, `EvaluateConstraints` is temporarily set to
// `true` to temporarily fix this issue.
// FIXME: This temporary fix can be removed after fully implementing
// p0588r1.
llvm::SaveAndRestore _(EvaluateConstraints, true);
return inherited::TransformLambdaBody(E, Body);
}
ExprResult TransformRequiresExpr(RequiresExpr *E) {
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
ExprResult TransReq = inherited::TransformRequiresExpr(E);
if (TransReq.isInvalid())
return TransReq;
assert(TransReq.get() != E &&
"Do not change value of isSatisfied for the existing expression. "
"Create a new expression instead.");
if (E->getBody()->isDependentContext()) {
Sema::SFINAETrap Trap(SemaRef);
// We recreate the RequiresExpr body, but not by instantiating it.
// Produce pending diagnostics for dependent access check.
SemaRef.PerformDependentDiagnostics(E->getBody(), TemplateArgs);
// FIXME: Store SFINAE diagnostics in RequiresExpr for diagnosis.
if (Trap.hasErrorOccurred())
TransReq.getAs<RequiresExpr>()->setSatisfied(false);
}
return TransReq;
}
bool TransformRequiresExprRequirements(
ArrayRef<concepts::Requirement *> Reqs,
SmallVectorImpl<concepts::Requirement *> &Transformed) {
bool SatisfactionDetermined = false;
for (concepts::Requirement *Req : Reqs) {
concepts::Requirement *TransReq = nullptr;
if (!SatisfactionDetermined) {
if (auto *TypeReq = dyn_cast<concepts::TypeRequirement>(Req))
TransReq = TransformTypeRequirement(TypeReq);
else if (auto *ExprReq = dyn_cast<concepts::ExprRequirement>(Req))
TransReq = TransformExprRequirement(ExprReq);
else
TransReq = TransformNestedRequirement(
cast<concepts::NestedRequirement>(Req));
if (!TransReq)
return true;
if (!TransReq->isDependent() && !TransReq->isSatisfied())
// [expr.prim.req]p6
// [...] The substitution and semantic constraint checking
// proceeds in lexical order and stops when a condition that
// determines the result of the requires-expression is
// encountered. [..]
SatisfactionDetermined = true;
} else
TransReq = Req;
Transformed.push_back(TransReq);
}
return false;
}
TemplateParameterList *TransformTemplateParameterList(
TemplateParameterList *OrigTPL) {
if (!OrigTPL || !OrigTPL->size()) return OrigTPL;
DeclContext *Owner = OrigTPL->getParam(0)->getDeclContext();
TemplateDeclInstantiator DeclInstantiator(getSema(),
/* DeclContext *Owner */ Owner, TemplateArgs);
DeclInstantiator.setEvaluateConstraints(EvaluateConstraints);
return DeclInstantiator.SubstTemplateParams(OrigTPL);
}
concepts::TypeRequirement *
TransformTypeRequirement(concepts::TypeRequirement *Req);
concepts::ExprRequirement *
TransformExprRequirement(concepts::ExprRequirement *Req);
concepts::NestedRequirement *
TransformNestedRequirement(concepts::NestedRequirement *Req);
ExprResult TransformRequiresTypeParams(
SourceLocation KWLoc, SourceLocation RBraceLoc, const RequiresExpr *RE,
RequiresExprBodyDecl *Body, ArrayRef<ParmVarDecl *> Params,
SmallVectorImpl<QualType> &PTypes,
SmallVectorImpl<ParmVarDecl *> &TransParams,
Sema::ExtParameterInfoBuilder &PInfos);
private:
ExprResult
transformNonTypeTemplateParmRef(Decl *AssociatedDecl,
const NonTypeTemplateParmDecl *parm,
SourceLocation loc, TemplateArgument arg,
UnsignedOrNone PackIndex, bool Final);
};
}
bool TemplateInstantiator::AlreadyTransformed(QualType T) {
if (T.isNull())
return true;
if (T->isInstantiationDependentType() || T->isVariablyModifiedType() ||
T->containsUnexpandedParameterPack())
return false;
getSema().MarkDeclarationsReferencedInType(Loc, T);
return true;
}
Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) {
if (!D)
return nullptr;
if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) {
if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
TTP->getPosition())) {
IsIncomplete = true;
return BailOutOnIncomplete ? nullptr : D;
}
TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
if (TTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
TemplateName Template = Arg.getAsTemplate();
assert(!Template.isNull() && Template.getAsTemplateDecl() &&
"Wrong kind of template template argument");
return Template.getAsTemplateDecl();
}
// Fall through to find the instantiated declaration for this template
// template parameter.
}
return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs);
}
Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) {
Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs);
if (!Inst)
return nullptr;
getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst);
return Inst;
}
bool TemplateInstantiator::TransformExceptionSpec(
SourceLocation Loc, FunctionProtoType::ExceptionSpecInfo &ESI,
SmallVectorImpl<QualType> &Exceptions, bool &Changed) {
if (ESI.Type == EST_Uninstantiated) {
ESI.instantiate();
Changed = true;
}
return inherited::TransformExceptionSpec(Loc, ESI, Exceptions, Changed);
}
NamedDecl *
TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D,
SourceLocation Loc) {
// If the first part of the nested-name-specifier was a template type
// parameter, instantiate that type parameter down to a tag type.
if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) {
const TemplateTypeParmType *TTP
= cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD));
if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
// FIXME: This needs testing w/ member access expressions.
TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getIndex());
if (TTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (!getSema().ArgPackSubstIndex)
return nullptr;
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
QualType T = Arg.getAsType();
if (T.isNull())
return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
if (const TagType *Tag = T->getAs<TagType>())
return Tag->getDecl();
// The resulting type is not a tag; complain.
getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T;
return nullptr;
}
}
return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
}
VarDecl *
TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *Declarator,
SourceLocation StartLoc,
SourceLocation NameLoc,
IdentifierInfo *Name) {
VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, Declarator,
StartLoc, NameLoc, Name);
if (Var)
getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
return Var;
}
VarDecl *TemplateInstantiator::RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
TypeSourceInfo *TSInfo,
QualType T) {
VarDecl *Var = inherited::RebuildObjCExceptionDecl(ExceptionDecl, TSInfo, T);
if (Var)
getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
return Var;
}
QualType
TemplateInstantiator::RebuildElaboratedType(SourceLocation KeywordLoc,
ElaboratedTypeKeyword Keyword,
NestedNameSpecifierLoc QualifierLoc,
QualType T) {
if (const TagType *TT = T->getAs<TagType>()) {
TagDecl* TD = TT->getDecl();
SourceLocation TagLocation = KeywordLoc;
IdentifierInfo *Id = TD->getIdentifier();
// TODO: should we even warn on struct/class mismatches for this? Seems
// like it's likely to produce a lot of spurious errors.
if (Id && Keyword != ElaboratedTypeKeyword::None &&
Keyword != ElaboratedTypeKeyword::Typename) {
TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword);
if (!SemaRef.isAcceptableTagRedeclaration(TD, Kind, /*isDefinition*/false,
TagLocation, Id)) {
SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag)
<< Id
<< FixItHint::CreateReplacement(SourceRange(TagLocation),
TD->getKindName());
SemaRef.Diag(TD->getLocation(), diag::note_previous_use);
}
}
}
return inherited::RebuildElaboratedType(KeywordLoc, Keyword, QualifierLoc, T);
}
TemplateName TemplateInstantiator::TransformTemplateName(
CXXScopeSpec &SS, TemplateName Name, SourceLocation NameLoc,
QualType ObjectType, NamedDecl *FirstQualifierInScope,
bool AllowInjectedClassName) {
if (TemplateTemplateParmDecl *TTP
= dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())) {
if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
TTP->getPosition())) {
IsIncomplete = true;
return BailOutOnIncomplete ? TemplateName() : Name;
}
TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());
if (TemplateArgs.isRewrite()) {
// We're rewriting the template parameter as a reference to another
// template parameter.
Arg = getTemplateArgumentPackPatternForRewrite(Arg);
assert(Arg.getKind() == TemplateArgument::Template &&
"unexpected nontype template argument kind in template rewrite");
return Arg.getAsTemplate();
}
auto [AssociatedDecl, Final] =
TemplateArgs.getAssociatedDecl(TTP->getDepth());
UnsignedOrNone PackIndex = std::nullopt;
if (TTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (!getSema().ArgPackSubstIndex) {
// We have the template argument pack to substitute, but we're not
// actually expanding the enclosing pack expansion yet. So, just
// keep the entire argument pack.
return getSema().Context.getSubstTemplateTemplateParmPack(
Arg, AssociatedDecl, TTP->getIndex(), Final);
}
PackIndex = getPackIndex(Arg);
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
TemplateName Template = Arg.getAsTemplate();
assert(!Template.isNull() && "Null template template argument");
return getSema().Context.getSubstTemplateTemplateParm(
Template, AssociatedDecl, TTP->getIndex(), PackIndex, Final);
}
}
if (SubstTemplateTemplateParmPackStorage *SubstPack
= Name.getAsSubstTemplateTemplateParmPack()) {
if (!getSema().ArgPackSubstIndex)
return Name;
TemplateArgument Pack = SubstPack->getArgumentPack();
TemplateName Template =
getPackSubstitutedTemplateArgument(getSema(), Pack).getAsTemplate();
return getSema().Context.getSubstTemplateTemplateParm(
Template, SubstPack->getAssociatedDecl(), SubstPack->getIndex(),
getPackIndex(Pack), SubstPack->getFinal());
}
return inherited::TransformTemplateName(SS, Name, NameLoc, ObjectType,
FirstQualifierInScope,
AllowInjectedClassName);
}
ExprResult
TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) {
if (!E->isTypeDependent())
return E;
return getSema().BuildPredefinedExpr(E->getLocation(), E->getIdentKind());
}
ExprResult
TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E,
NonTypeTemplateParmDecl *NTTP) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(),
NTTP->getPosition())) {
IsIncomplete = true;
return BailOutOnIncomplete ? ExprError() : E;
}
TemplateArgument Arg = TemplateArgs(NTTP->getDepth(), NTTP->getPosition());
if (TemplateArgs.isRewrite()) {
// We're rewriting the template parameter as a reference to another
// template parameter.
Arg = getTemplateArgumentPackPatternForRewrite(Arg);
assert(Arg.getKind() == TemplateArgument::Expression &&
"unexpected nontype template argument kind in template rewrite");
// FIXME: This can lead to the same subexpression appearing multiple times
// in a complete expression.
return Arg.getAsExpr();
}
auto [AssociatedDecl, Final] =
TemplateArgs.getAssociatedDecl(NTTP->getDepth());
UnsignedOrNone PackIndex = std::nullopt;
if (NTTP->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (!getSema().ArgPackSubstIndex) {
// We have an argument pack, but we can't select a particular argument
// out of it yet. Therefore, we'll build an expression to hold on to that
// argument pack.
QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs,
E->getLocation(),
NTTP->getDeclName());
if (TargetType.isNull())
return ExprError();
QualType ExprType = TargetType.getNonLValueExprType(SemaRef.Context);
if (TargetType->isRecordType())
ExprType.addConst();
return new (SemaRef.Context) SubstNonTypeTemplateParmPackExpr(
ExprType, TargetType->isReferenceType() ? VK_LValue : VK_PRValue,
E->getLocation(), Arg, AssociatedDecl, NTTP->getPosition(), Final);
}
PackIndex = getPackIndex(Arg);
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
return transformNonTypeTemplateParmRef(AssociatedDecl, NTTP, E->getLocation(),
Arg, PackIndex, Final);
}
const AnnotateAttr *
TemplateInstantiator::TransformAnnotateAttr(const AnnotateAttr *AA) {
SmallVector<Expr *> Args;
for (Expr *Arg : AA->args()) {
ExprResult Res = getDerived().TransformExpr(Arg);
if (Res.isUsable())
Args.push_back(Res.get());
}
return AnnotateAttr::CreateImplicit(getSema().Context, AA->getAnnotation(),
Args.data(), Args.size(), AA->getRange());
}
const CXXAssumeAttr *
TemplateInstantiator::TransformCXXAssumeAttr(const CXXAssumeAttr *AA) {
ExprResult Res = getDerived().TransformExpr(AA->getAssumption());
if (!Res.isUsable())
return AA;
Res = getSema().ActOnFinishFullExpr(Res.get(),
/*DiscardedValue=*/false);
if (!Res.isUsable())
return AA;
if (!(Res.get()->getDependence() & ExprDependence::TypeValueInstantiation)) {
Res = getSema().BuildCXXAssumeExpr(Res.get(), AA->getAttrName(),
AA->getRange());
if (!Res.isUsable())
return AA;
}
return CXXAssumeAttr::CreateImplicit(getSema().Context, Res.get(),
AA->getRange());
}
const LoopHintAttr *
TemplateInstantiator::TransformLoopHintAttr(const LoopHintAttr *LH) {
Expr *TransformedExpr = getDerived().TransformExpr(LH->getValue()).get();
if (TransformedExpr == LH->getValue())
return LH;
// Generate error if there is a problem with the value.
if (getSema().CheckLoopHintExpr(TransformedExpr, LH->getLocation(),
LH->getSemanticSpelling() ==
LoopHintAttr::Pragma_unroll))
return LH;
LoopHintAttr::OptionType Option = LH->getOption();
LoopHintAttr::LoopHintState State = LH->getState();
llvm::APSInt ValueAPS =
TransformedExpr->EvaluateKnownConstInt(getSema().getASTContext());
// The values of 0 and 1 block any unrolling of the loop.
if (ValueAPS.isZero() || ValueAPS.isOne()) {
Option = LoopHintAttr::Unroll;
State = LoopHintAttr::Disable;
}
// Create new LoopHintValueAttr with integral expression in place of the
// non-type template parameter.
return LoopHintAttr::CreateImplicit(getSema().Context, Option, State,
TransformedExpr, *LH);
}
const NoInlineAttr *TemplateInstantiator::TransformStmtNoInlineAttr(
const Stmt *OrigS, const Stmt *InstS, const NoInlineAttr *A) {
if (!A || getSema().CheckNoInlineAttr(OrigS, InstS, *A))
return nullptr;
return A;
}
const AlwaysInlineAttr *TemplateInstantiator::TransformStmtAlwaysInlineAttr(
const Stmt *OrigS, const Stmt *InstS, const AlwaysInlineAttr *A) {
if (!A || getSema().CheckAlwaysInlineAttr(OrigS, InstS, *A))
return nullptr;
return A;
}
const CodeAlignAttr *
TemplateInstantiator::TransformCodeAlignAttr(const CodeAlignAttr *CA) {
Expr *TransformedExpr = getDerived().TransformExpr(CA->getAlignment()).get();
return getSema().BuildCodeAlignAttr(*CA, TransformedExpr);
}
const OpenACCRoutineDeclAttr *
TemplateInstantiator::TransformOpenACCRoutineDeclAttr(
const OpenACCRoutineDeclAttr *A) {
llvm_unreachable("RoutineDecl should only be a declaration attribute, as it "
"applies to a Function Decl (and a few places for VarDecl)");
}
ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef(
Decl *AssociatedDecl, const NonTypeTemplateParmDecl *parm,
SourceLocation loc, TemplateArgument arg, UnsignedOrNone PackIndex,
bool Final) {
ExprResult result;
// Determine the substituted parameter type. We can usually infer this from
// the template argument, but not always.
auto SubstParamType = [&] {
QualType T;
if (parm->isExpandedParameterPack())
T = parm->getExpansionType(*SemaRef.ArgPackSubstIndex);
else
T = parm->getType();
if (parm->isParameterPack() && isa<PackExpansionType>(T))
T = cast<PackExpansionType>(T)->getPattern();
return SemaRef.SubstType(T, TemplateArgs, loc, parm->getDeclName());
};
bool refParam = false;
// The template argument itself might be an expression, in which case we just
// return that expression. This happens when substituting into an alias
// template.
if (arg.getKind() == TemplateArgument::Expression) {
Expr *argExpr = arg.getAsExpr();
result = argExpr;
if (argExpr->isLValue()) {
if (argExpr->getType()->isRecordType()) {
// Check whether the parameter was actually a reference.
QualType paramType = SubstParamType();
if (paramType.isNull())
return ExprError();
refParam = paramType->isReferenceType();
} else {
refParam = true;
}
}
} else if (arg.getKind() == TemplateArgument::Declaration ||
arg.getKind() == TemplateArgument::NullPtr) {
if (arg.getKind() == TemplateArgument::Declaration) {
ValueDecl *VD = arg.getAsDecl();
// Find the instantiation of the template argument. This is
// required for nested templates.
VD = cast_or_null<ValueDecl>(
getSema().FindInstantiatedDecl(loc, VD, TemplateArgs));
if (!VD)
return ExprError();
}
QualType paramType = arg.getNonTypeTemplateArgumentType();
assert(!paramType.isNull() && "type substitution failed for param type");
assert(!paramType->isDependentType() && "param type still dependent");
result = SemaRef.BuildExpressionFromDeclTemplateArgument(arg, paramType, loc);
refParam = paramType->isReferenceType();
} else {
QualType paramType = arg.getNonTypeTemplateArgumentType();
result = SemaRef.BuildExpressionFromNonTypeTemplateArgument(arg, loc);
refParam = paramType->isReferenceType();
assert(result.isInvalid() ||
SemaRef.Context.hasSameType(result.get()->getType(),
paramType.getNonReferenceType()));
}
if (result.isInvalid())
return ExprError();
Expr *resultExpr = result.get();
return new (SemaRef.Context) SubstNonTypeTemplateParmExpr(
resultExpr->getType(), resultExpr->getValueKind(), loc, resultExpr,
AssociatedDecl, parm->getIndex(), PackIndex, refParam, Final);
}
ExprResult
TemplateInstantiator::TransformSubstNonTypeTemplateParmPackExpr(
SubstNonTypeTemplateParmPackExpr *E) {
if (!getSema().ArgPackSubstIndex) {
// We aren't expanding the parameter pack, so just return ourselves.
return E;
}
TemplateArgument Pack = E->getArgumentPack();
TemplateArgument Arg = getPackSubstitutedTemplateArgument(getSema(), Pack);
return transformNonTypeTemplateParmRef(
E->getAssociatedDecl(), E->getParameterPack(),
E->getParameterPackLocation(), Arg, getPackIndex(Pack), E->getFinal());
}
ExprResult
TemplateInstantiator::TransformSubstNonTypeTemplateParmExpr(
SubstNonTypeTemplateParmExpr *E) {
ExprResult SubstReplacement = E->getReplacement();
if (!isa<ConstantExpr>(SubstReplacement.get()))
SubstReplacement = TransformExpr(E->getReplacement());
if (SubstReplacement.isInvalid())
return true;
QualType SubstType = TransformType(E->getParameterType(getSema().Context));
if (SubstType.isNull())
return true;
// The type may have been previously dependent and not now, which means we
// might have to implicit cast the argument to the new type, for example:
// template<auto T, decltype(T) U>
// concept C = sizeof(U) == 4;
// void foo() requires C<2, 'a'> { }
// When normalizing foo(), we first form the normalized constraints of C:
// AtomicExpr(sizeof(U) == 4,
// U=SubstNonTypeTemplateParmExpr(Param=U,
// Expr=DeclRef(U),
// Type=decltype(T)))
// Then we substitute T = 2, U = 'a' into the parameter mapping, and need to
// produce:
// AtomicExpr(sizeof(U) == 4,
// U=SubstNonTypeTemplateParmExpr(Param=U,
// Expr=ImpCast(
// decltype(2),
// SubstNTTPE(Param=U, Expr='a',
// Type=char)),
// Type=decltype(2)))
// The call to CheckTemplateArgument here produces the ImpCast.
TemplateArgument SugaredConverted, CanonicalConverted;
if (SemaRef
.CheckTemplateArgument(E->getParameter(), SubstType,
SubstReplacement.get(), SugaredConverted,
CanonicalConverted,
/*StrictCheck=*/false, Sema::CTAK_Specified)
.isInvalid())
return true;
return transformNonTypeTemplateParmRef(
E->getAssociatedDecl(), E->getParameter(), E->getExprLoc(),
SugaredConverted, E->getPackIndex(), E->getFinal());
}
ExprResult TemplateInstantiator::RebuildVarDeclRefExpr(ValueDecl *PD,
SourceLocation Loc) {
DeclarationNameInfo NameInfo(PD->getDeclName(), Loc);
return getSema().BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo, PD);
}
ExprResult
TemplateInstantiator::TransformFunctionParmPackExpr(FunctionParmPackExpr *E) {
if (getSema().ArgPackSubstIndex) {
// We can expand this parameter pack now.
ValueDecl *D = E->getExpansion(*getSema().ArgPackSubstIndex);
ValueDecl *VD = cast_or_null<ValueDecl>(TransformDecl(E->getExprLoc(), D));
if (!VD)
return ExprError();
return RebuildVarDeclRefExpr(VD, E->getExprLoc());
}
QualType T = TransformType(E->getType());
if (T.isNull())
return ExprError();
// Transform each of the parameter expansions into the corresponding
// parameters in the instantiation of the function decl.
SmallVector<ValueDecl *, 8> Vars;
Vars.reserve(E->getNumExpansions());
for (FunctionParmPackExpr::iterator I = E->begin(), End = E->end();
I != End; ++I) {
ValueDecl *D = cast_or_null<ValueDecl>(TransformDecl(E->getExprLoc(), *I));
if (!D)
return ExprError();
Vars.push_back(D);
}
auto *PackExpr =
FunctionParmPackExpr::Create(getSema().Context, T, E->getParameterPack(),
E->getParameterPackLocation(), Vars);
getSema().MarkFunctionParmPackReferenced(PackExpr);
return PackExpr;
}
ExprResult
TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
ValueDecl *PD) {
typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found
= getSema().CurrentInstantiationScope->findInstantiationOf(PD);
assert(Found && "no instantiation for parameter pack");
Decl *TransformedDecl;
if (DeclArgumentPack *Pack = dyn_cast<DeclArgumentPack *>(*Found)) {
// If this is a reference to a function parameter pack which we can
// substitute but can't yet expand, build a FunctionParmPackExpr for it.
if (!getSema().ArgPackSubstIndex) {
QualType T = TransformType(E->getType());
if (T.isNull())
return ExprError();
auto *PackExpr = FunctionParmPackExpr::Create(getSema().Context, T, PD,
E->getExprLoc(), *Pack);
getSema().MarkFunctionParmPackReferenced(PackExpr);
return PackExpr;
}
TransformedDecl = (*Pack)[*getSema().ArgPackSubstIndex];
} else {
TransformedDecl = cast<Decl *>(*Found);
}
// We have either an unexpanded pack or a specific expansion.
return RebuildVarDeclRefExpr(cast<ValueDecl>(TransformedDecl),
E->getExprLoc());
}
ExprResult
TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
NamedDecl *D = E->getDecl();
// Handle references to non-type template parameters and non-type template
// parameter packs.
if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
if (NTTP->getDepth() < TemplateArgs.getNumLevels())
return TransformTemplateParmRefExpr(E, NTTP);
// We have a non-type template parameter that isn't fully substituted;
// FindInstantiatedDecl will find it in the local instantiation scope.
}
// Handle references to function parameter packs.
if (VarDecl *PD = dyn_cast<VarDecl>(D))
if (PD->isParameterPack())
return TransformFunctionParmPackRefExpr(E, PD);
return inherited::TransformDeclRefExpr(E);
}
ExprResult TemplateInstantiator::TransformCXXDefaultArgExpr(
CXXDefaultArgExpr *E) {
assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())->
getDescribedFunctionTemplate() &&
"Default arg expressions are never formed in dependent cases.");
return SemaRef.BuildCXXDefaultArgExpr(
E->getUsedLocation(), cast<FunctionDecl>(E->getParam()->getDeclContext()),
E->getParam());
}
template<typename Fn>
QualType TemplateInstantiator::TransformFunctionProtoType(TypeLocBuilder &TLB,
FunctionProtoTypeLoc TL,
CXXRecordDecl *ThisContext,
Qualifiers ThisTypeQuals,
Fn TransformExceptionSpec) {
// If this is a lambda or block, the transformation MUST be done in the
// CurrentInstantiationScope since it introduces a mapping of
// the original to the newly created transformed parameters.
//
// In that case, TemplateInstantiator::TransformLambdaExpr will
// have already pushed a scope for this prototype, so don't create
// a second one.
LocalInstantiationScope *Current = getSema().CurrentInstantiationScope;
std::optional<LocalInstantiationScope> Scope;
if (!Current || !Current->isLambdaOrBlock())
Scope.emplace(SemaRef, /*CombineWithOuterScope=*/true);
return inherited::TransformFunctionProtoType(
TLB, TL, ThisContext, ThisTypeQuals, TransformExceptionSpec);
}
ParmVarDecl *TemplateInstantiator::TransformFunctionTypeParam(
ParmVarDecl *OldParm, int indexAdjustment, UnsignedOrNone NumExpansions,
bool ExpectParameterPack) {
auto NewParm = SemaRef.SubstParmVarDecl(
OldParm, TemplateArgs, indexAdjustment, NumExpansions,
ExpectParameterPack, EvaluateConstraints);
if (NewParm && SemaRef.getLangOpts().OpenCL)
SemaRef.deduceOpenCLAddressSpace(NewParm);
return NewParm;
}
QualType TemplateInstantiator::BuildSubstTemplateTypeParmType(
TypeLocBuilder &TLB, bool SuppressObjCLifetime, bool Final,
Decl *AssociatedDecl, unsigned Index, UnsignedOrNone PackIndex,
TemplateArgument Arg, SourceLocation NameLoc) {
QualType Replacement = Arg.getAsType();
// If the template parameter had ObjC lifetime qualifiers,
// then any such qualifiers on the replacement type are ignored.
if (SuppressObjCLifetime) {
Qualifiers RQs;
RQs = Replacement.getQualifiers();
RQs.removeObjCLifetime();
Replacement =
SemaRef.Context.getQualifiedType(Replacement.getUnqualifiedType(), RQs);
}
// TODO: only do this uniquing once, at the start of instantiation.
QualType Result = getSema().Context.getSubstTemplateTypeParmType(
Replacement, AssociatedDecl, Index, PackIndex, Final);
SubstTemplateTypeParmTypeLoc NewTL =
TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(NameLoc);
return Result;
}
QualType
TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB,
TemplateTypeParmTypeLoc TL,
bool SuppressObjCLifetime) {
const TemplateTypeParmType *T = TL.getTypePtr();
if (T->getDepth() < TemplateArgs.getNumLevels()) {
// Replace the template type parameter with its corresponding
// template argument.
// If the corresponding template argument is NULL or doesn't exist, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template class, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) {
IsIncomplete = true;
if (BailOutOnIncomplete)
return QualType();
TemplateTypeParmTypeLoc NewTL
= TLB.push<TemplateTypeParmTypeLoc>(TL.getType());
NewTL.setNameLoc(TL.getNameLoc());
return TL.getType();
}
TemplateArgument Arg = TemplateArgs(T->getDepth(), T->getIndex());
if (TemplateArgs.isRewrite()) {
// We're rewriting the template parameter as a reference to another
// template parameter.
Arg = getTemplateArgumentPackPatternForRewrite(Arg);
assert(Arg.getKind() == TemplateArgument::Type &&
"unexpected nontype template argument kind in template rewrite");
QualType NewT = Arg.getAsType();
TLB.pushTrivial(SemaRef.Context, NewT, TL.getNameLoc());
return NewT;
}
auto [AssociatedDecl, Final] =
TemplateArgs.getAssociatedDecl(T->getDepth());
UnsignedOrNone PackIndex = std::nullopt;
if (T->isParameterPack()) {
assert(Arg.getKind() == TemplateArgument::Pack &&
"Missing argument pack");
if (!getSema().ArgPackSubstIndex) {
// We have the template argument pack, but we're not expanding the
// enclosing pack expansion yet. Just save the template argument
// pack for later substitution.
QualType Result = getSema().Context.getSubstTemplateTypeParmPackType(
AssociatedDecl, T->getIndex(), Final, Arg);
SubstTemplateTypeParmPackTypeLoc NewTL
= TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
// PackIndex starts from last element.
PackIndex = getPackIndex(Arg);
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}
assert(Arg.getKind() == TemplateArgument::Type &&
"Template argument kind mismatch");
return BuildSubstTemplateTypeParmType(TLB, SuppressObjCLifetime, Final,
AssociatedDecl, T->getIndex(),
PackIndex, Arg, TL.getNameLoc());
}
// The template type parameter comes from an inner template (e.g.,
// the template parameter list of a member template inside the
// template we are instantiating). Create a new template type
// parameter with the template "level" reduced by one.
TemplateTypeParmDecl *NewTTPDecl = nullptr;
if (TemplateTypeParmDecl *OldTTPDecl = T->getDecl())
NewTTPDecl = cast_or_null<TemplateTypeParmDecl>(
TransformDecl(TL.getNameLoc(), OldTTPDecl));
QualType Result = getSema().Context.getTemplateTypeParmType(
T->getDepth() - TemplateArgs.getNumSubstitutedLevels(), T->getIndex(),
T->isParameterPack(), NewTTPDecl);
TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
QualType TemplateInstantiator::TransformSubstTemplateTypeParmPackType(
TypeLocBuilder &TLB, SubstTemplateTypeParmPackTypeLoc TL,
bool SuppressObjCLifetime) {
const SubstTemplateTypeParmPackType *T = TL.getTypePtr();
Decl *NewReplaced = TransformDecl(TL.getNameLoc(), T->getAssociatedDecl());
if (!getSema().ArgPackSubstIndex) {
// We aren't expanding the parameter pack, so just return ourselves.
QualType Result = TL.getType();
if (NewReplaced != T->getAssociatedDecl())
Result = getSema().Context.getSubstTemplateTypeParmPackType(
NewReplaced, T->getIndex(), T->getFinal(), T->getArgumentPack());
SubstTemplateTypeParmPackTypeLoc NewTL =
TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
}
TemplateArgument Pack = T->getArgumentPack();
TemplateArgument Arg = getPackSubstitutedTemplateArgument(getSema(), Pack);
return BuildSubstTemplateTypeParmType(
TLB, SuppressObjCLifetime, T->getFinal(), NewReplaced, T->getIndex(),
getPackIndex(Pack), Arg, TL.getNameLoc());
}
static concepts::Requirement::SubstitutionDiagnostic *
createSubstDiag(Sema &S, TemplateDeductionInfo &Info,
Sema::EntityPrinter Printer) {
SmallString<128> Message;
SourceLocation ErrorLoc;
if (Info.hasSFINAEDiagnostic()) {
PartialDiagnosticAt PDA(SourceLocation(),
PartialDiagnostic::NullDiagnostic{});
Info.takeSFINAEDiagnostic(PDA);
PDA.second.EmitToString(S.getDiagnostics(), Message);
ErrorLoc = PDA.first;
} else {
ErrorLoc = Info.getLocation();
}
SmallString<128> Entity;
llvm::raw_svector_ostream OS(Entity);
Printer(OS);
const ASTContext &C = S.Context;
return new (C) concepts::Requirement::SubstitutionDiagnostic{
C.backupStr(Entity), ErrorLoc, C.backupStr(Message)};
}
concepts::Requirement::SubstitutionDiagnostic *
Sema::createSubstDiagAt(SourceLocation Location, EntityPrinter Printer) {
SmallString<128> Entity;
llvm::raw_svector_ostream OS(Entity);
Printer(OS);
const ASTContext &C = Context;
return new (C) concepts::Requirement::SubstitutionDiagnostic{
/*SubstitutedEntity=*/C.backupStr(Entity),
/*DiagLoc=*/Location, /*DiagMessage=*/StringRef()};
}
ExprResult TemplateInstantiator::TransformRequiresTypeParams(
SourceLocation KWLoc, SourceLocation RBraceLoc, const RequiresExpr *RE,
RequiresExprBodyDecl *Body, ArrayRef<ParmVarDecl *> Params,
SmallVectorImpl<QualType> &PTypes,
SmallVectorImpl<ParmVarDecl *> &TransParams,
Sema::ExtParameterInfoBuilder &PInfos) {
TemplateDeductionInfo Info(KWLoc);
Sema::InstantiatingTemplate TypeInst(SemaRef, KWLoc,
RE, Info,
SourceRange{KWLoc, RBraceLoc});
Sema::SFINAETrap Trap(SemaRef);
unsigned ErrorIdx;
if (getDerived().TransformFunctionTypeParams(
KWLoc, Params, /*ParamTypes=*/nullptr, /*ParamInfos=*/nullptr, PTypes,
&TransParams, PInfos, &ErrorIdx) ||
Trap.hasErrorOccurred()) {
SmallVector<concepts::Requirement *, 4> TransReqs;
ParmVarDecl *FailedDecl = Params[ErrorIdx];
// Add a 'failed' Requirement to contain the error that caused the failure
// here.
TransReqs.push_back(RebuildTypeRequirement(createSubstDiag(
SemaRef, Info, [&](llvm::raw_ostream &OS) { OS << *FailedDecl; })));
return getDerived().RebuildRequiresExpr(KWLoc, Body, RE->getLParenLoc(),
TransParams, RE->getRParenLoc(),
TransReqs, RBraceLoc);
}
return ExprResult{};
}
concepts::TypeRequirement *
TemplateInstantiator::TransformTypeRequirement(concepts::TypeRequirement *Req) {
if (!Req->isDependent() && !AlwaysRebuild())
return Req;
if (Req->isSubstitutionFailure()) {
if (AlwaysRebuild())
return RebuildTypeRequirement(
Req->getSubstitutionDiagnostic());
return Req;
}
Sema::SFINAETrap Trap(SemaRef);
TemplateDeductionInfo Info(Req->getType()->getTypeLoc().getBeginLoc());
Sema::InstantiatingTemplate TypeInst(SemaRef,
Req->getType()->getTypeLoc().getBeginLoc(), Req, Info,
Req->getType()->getTypeLoc().getSourceRange());
if (TypeInst.isInvalid())
return nullptr;
TypeSourceInfo *TransType = TransformType(Req->getType());
if (!TransType || Trap.hasErrorOccurred())
return RebuildTypeRequirement(createSubstDiag(SemaRef, Info,
[&] (llvm::raw_ostream& OS) {
Req->getType()->getType().print(OS, SemaRef.getPrintingPolicy());
}));
return RebuildTypeRequirement(TransType);
}
concepts::ExprRequirement *
TemplateInstantiator::TransformExprRequirement(concepts::ExprRequirement *Req) {
if (!Req->isDependent() && !AlwaysRebuild())
return Req;
Sema::SFINAETrap Trap(SemaRef);
llvm::PointerUnion<Expr *, concepts::Requirement::SubstitutionDiagnostic *>
TransExpr;
if (Req->isExprSubstitutionFailure())
TransExpr = Req->getExprSubstitutionDiagnostic();
else {
Expr *E = Req->getExpr();
TemplateDeductionInfo Info(E->getBeginLoc());
Sema::InstantiatingTemplate ExprInst(SemaRef, E->getBeginLoc(), Req, Info,
E->getSourceRange());
if (ExprInst.isInvalid())
return nullptr;
ExprResult TransExprRes = TransformExpr(E);
if (!TransExprRes.isInvalid() && !Trap.hasErrorOccurred() &&
TransExprRes.get()->hasPlaceholderType())
TransExprRes = SemaRef.CheckPlaceholderExpr(TransExprRes.get());
if (TransExprRes.isInvalid() || Trap.hasErrorOccurred())
TransExpr = createSubstDiag(SemaRef, Info, [&](llvm::raw_ostream &OS) {
E->printPretty(OS, nullptr, SemaRef.getPrintingPolicy());
});
else
TransExpr = TransExprRes.get();
}
std::optional<concepts::ExprRequirement::ReturnTypeRequirement> TransRetReq;
const auto &RetReq = Req->getReturnTypeRequirement();
if (RetReq.isEmpty())
TransRetReq.emplace();
else if (RetReq.isSubstitutionFailure())
TransRetReq.emplace(RetReq.getSubstitutionDiagnostic());
else if (RetReq.isTypeConstraint()) {
TemplateParameterList *OrigTPL =
RetReq.getTypeConstraintTemplateParameterList();
TemplateDeductionInfo Info(OrigTPL->getTemplateLoc());
Sema::InstantiatingTemplate TPLInst(SemaRef, OrigTPL->getTemplateLoc(),
Req, Info, OrigTPL->getSourceRange());
if (TPLInst.isInvalid())
return nullptr;
TemplateParameterList *TPL = TransformTemplateParameterList(OrigTPL);
if (!TPL || Trap.hasErrorOccurred())
TransRetReq.emplace(createSubstDiag(SemaRef, Info,
[&] (llvm::raw_ostream& OS) {
RetReq.getTypeConstraint()->getImmediatelyDeclaredConstraint()
->printPretty(OS, nullptr, SemaRef.getPrintingPolicy());
}));
else {
TPLInst.Clear();
TransRetReq.emplace(TPL);
}
}
assert(TransRetReq && "All code paths leading here must set TransRetReq");
if (Expr *E = TransExpr.dyn_cast<Expr *>())
return RebuildExprRequirement(E, Req->isSimple(), Req->getNoexceptLoc(),
std::move(*TransRetReq));
return RebuildExprRequirement(
cast<concepts::Requirement::SubstitutionDiagnostic *>(TransExpr),
Req->isSimple(), Req->getNoexceptLoc(), std::move(*TransRetReq));
}
concepts::NestedRequirement *
TemplateInstantiator::TransformNestedRequirement(
concepts::NestedRequirement *Req) {
if (!Req->isDependent() && !AlwaysRebuild())
return Req;
if (Req->hasInvalidConstraint()) {
if (AlwaysRebuild())
return RebuildNestedRequirement(Req->getInvalidConstraintEntity(),
Req->getConstraintSatisfaction());
return Req;
}
Sema::InstantiatingTemplate ReqInst(SemaRef,
Req->getConstraintExpr()->getBeginLoc(), Req,
Sema::InstantiatingTemplate::ConstraintsCheck{},
Req->getConstraintExpr()->getSourceRange());
if (!getEvaluateConstraints()) {
ExprResult TransConstraint = TransformExpr(Req->getConstraintExpr());
if (TransConstraint.isInvalid() || !TransConstraint.get())
return nullptr;
if (TransConstraint.get()->isInstantiationDependent())
return new (SemaRef.Context)
concepts::NestedRequirement(TransConstraint.get());
ConstraintSatisfaction Satisfaction;
return new (SemaRef.Context) concepts::NestedRequirement(
SemaRef.Context, TransConstraint.get(), Satisfaction);
}
ExprResult TransConstraint;
ConstraintSatisfaction Satisfaction;
TemplateDeductionInfo Info(Req->getConstraintExpr()->getBeginLoc());
{
EnterExpressionEvaluationContext ContextRAII(
SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
Sema::SFINAETrap Trap(SemaRef);
Sema::InstantiatingTemplate ConstrInst(SemaRef,
Req->getConstraintExpr()->getBeginLoc(), Req, Info,
Req->getConstraintExpr()->getSourceRange());
if (ConstrInst.isInvalid())
return nullptr;
llvm::SmallVector<Expr *> Result;
if (!SemaRef.CheckConstraintSatisfaction(
nullptr,
AssociatedConstraint(Req->getConstraintExpr(),
SemaRef.ArgPackSubstIndex),
Result, TemplateArgs, Req->getConstraintExpr()->getSourceRange(),
Satisfaction) &&
!Result.empty())
TransConstraint = Result[0];
assert(!Trap.hasErrorOccurred() && "Substitution failures must be handled "
"by CheckConstraintSatisfaction.");
}
ASTContext &C = SemaRef.Context;
if (TransConstraint.isUsable() &&
TransConstraint.get()->isInstantiationDependent())
return new (C) concepts::NestedRequirement(TransConstraint.get());
if (TransConstraint.isInvalid() || !TransConstraint.get() ||
Satisfaction.HasSubstitutionFailure()) {
SmallString<128> Entity;
llvm::raw_svector_ostream OS(Entity);
Req->getConstraintExpr()->printPretty(OS, nullptr,
SemaRef.getPrintingPolicy());
return new (C) concepts::NestedRequirement(
SemaRef.Context, C.backupStr(Entity), Satisfaction);
}
return new (C)
concepts::NestedRequirement(C, TransConstraint.get(), Satisfaction);
}
TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T,
const MultiLevelTemplateArgumentList &Args,
SourceLocation Loc,
DeclarationName Entity,
bool AllowDeducedTST) {
assert(!CodeSynthesisContexts.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
if (!T->getType()->isInstantiationDependentType() &&
!T->getType()->isVariablyModifiedType())
return T;
TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
return AllowDeducedTST ? Instantiator.TransformTypeWithDeducedTST(T)
: Instantiator.TransformType(T);
}
TypeSourceInfo *Sema::SubstType(TypeLoc TL,
const MultiLevelTemplateArgumentList &Args,
SourceLocation Loc,
DeclarationName Entity) {
assert(!CodeSynthesisContexts.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
if (TL.getType().isNull())
return nullptr;
if (!TL.getType()->isInstantiationDependentType() &&
!TL.getType()->isVariablyModifiedType()) {
// FIXME: Make a copy of the TypeLoc data here, so that we can
// return a new TypeSourceInfo. Inefficient!
TypeLocBuilder TLB;
TLB.pushFullCopy(TL);
return TLB.getTypeSourceInfo(Context, TL.getType());
}
TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
TypeLocBuilder TLB;
TLB.reserve(TL.getFullDataSize());
QualType Result = Instantiator.TransformType(TLB, TL);
if (Result.isNull())
return nullptr;
return TLB.getTypeSourceInfo(Context, Result);
}
/// Deprecated form of the above.
QualType Sema::SubstType(QualType T,
const MultiLevelTemplateArgumentList &TemplateArgs,
SourceLocation Loc, DeclarationName Entity,
bool *IsIncompleteSubstitution) {
assert(!CodeSynthesisContexts.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
// If T is not a dependent type or a variably-modified type, there
// is nothing to do.
if (!T->isInstantiationDependentType() && !T->isVariablyModifiedType())
return T;
TemplateInstantiator Instantiator(
*this, TemplateArgs, Loc, Entity,
/*BailOutOnIncomplete=*/IsIncompleteSubstitution != nullptr);
QualType QT = Instantiator.TransformType(T);
if (IsIncompleteSubstitution && Instantiator.getIsIncomplete())
*IsIncompleteSubstitution = true;
return QT;
}
static bool NeedsInstantiationAsFunctionType(TypeSourceInfo *T) {
if (T->getType()->isInstantiationDependentType() ||
T->getType()->isVariablyModifiedType())
return true;
TypeLoc TL = T->getTypeLoc().IgnoreParens();
if (!TL.getAs<FunctionProtoTypeLoc>())
return false;
FunctionProtoTypeLoc FP = TL.castAs<FunctionProtoTypeLoc>();
for (ParmVarDecl *P : FP.getParams()) {
// This must be synthesized from a typedef.
if (!P) continue;
// If there are any parameters, a new TypeSourceInfo that refers to the
// instantiated parameters must be built.
return true;
}
return false;
}
TypeSourceInfo *Sema::SubstFunctionDeclType(TypeSourceInfo *T,
const MultiLevelTemplateArgumentList &Args,
SourceLocation Loc,
DeclarationName Entity,
CXXRecordDecl *ThisContext,
Qualifiers ThisTypeQuals,
bool EvaluateConstraints) {
assert(!CodeSynthesisContexts.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
if (!NeedsInstantiationAsFunctionType(T))
return T;
TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
Instantiator.setEvaluateConstraints(EvaluateConstraints);
TypeLocBuilder TLB;
TypeLoc TL = T->getTypeLoc();
TLB.reserve(TL.getFullDataSize());
QualType Result;
if (FunctionProtoTypeLoc Proto =
TL.IgnoreParens().getAs<FunctionProtoTypeLoc>()) {
// Instantiate the type, other than its exception specification. The
// exception specification is instantiated in InitFunctionInstantiation
// once we've built the FunctionDecl.
// FIXME: Set the exception specification to EST_Uninstantiated here,
// instead of rebuilding the function type again later.
Result = Instantiator.TransformFunctionProtoType(
TLB, Proto, ThisContext, ThisTypeQuals,
[](FunctionProtoType::ExceptionSpecInfo &ESI,
bool &Changed) { return false; });
} else {
Result = Instantiator.TransformType(TLB, TL);
}
// When there are errors resolving types, clang may use IntTy as a fallback,
// breaking our assumption that function declarations have function types.
if (Result.isNull() || !Result->isFunctionType())
return nullptr;
return TLB.getTypeSourceInfo(Context, Result);
}
bool Sema::SubstExceptionSpec(SourceLocation Loc,
FunctionProtoType::ExceptionSpecInfo &ESI,
SmallVectorImpl<QualType> &ExceptionStorage,
const MultiLevelTemplateArgumentList &Args) {
bool Changed = false;
TemplateInstantiator Instantiator(*this, Args, Loc, DeclarationName());
return Instantiator.TransformExceptionSpec(Loc, ESI, ExceptionStorage,
Changed);
}
void Sema::SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
const MultiLevelTemplateArgumentList &Args) {
FunctionProtoType::ExceptionSpecInfo ESI =
Proto->getExtProtoInfo().ExceptionSpec;
SmallVector<QualType, 4> ExceptionStorage;
if (SubstExceptionSpec(New->getTypeSourceInfo()->getTypeLoc().getEndLoc(),
ESI, ExceptionStorage, Args))
// On error, recover by dropping the exception specification.
ESI.Type = EST_None;
UpdateExceptionSpec(New, ESI);
}
namespace {
struct GetContainedInventedTypeParmVisitor :
public TypeVisitor<GetContainedInventedTypeParmVisitor,
TemplateTypeParmDecl *> {
using TypeVisitor<GetContainedInventedTypeParmVisitor,
TemplateTypeParmDecl *>::Visit;
TemplateTypeParmDecl *Visit(QualType T) {
if (T.isNull())
return nullptr;
return Visit(T.getTypePtr());
}
// The deduced type itself.
TemplateTypeParmDecl *VisitTemplateTypeParmType(
const TemplateTypeParmType *T) {
if (!T->getDecl() || !T->getDecl()->isImplicit())
return nullptr;
return T->getDecl();
}
// Only these types can contain 'auto' types, and subsequently be replaced
// by references to invented parameters.
TemplateTypeParmDecl *VisitElaboratedType(const ElaboratedType *T) {
return Visit(T->getNamedType());
}
TemplateTypeParmDecl *VisitPointerType(const PointerType *T) {
return Visit(T->getPointeeType());
}
TemplateTypeParmDecl *VisitBlockPointerType(const BlockPointerType *T) {
return Visit(T->getPointeeType());
}
TemplateTypeParmDecl *VisitReferenceType(const ReferenceType *T) {
return Visit(T->getPointeeTypeAsWritten());
}
TemplateTypeParmDecl *VisitMemberPointerType(const MemberPointerType *T) {
return Visit(T->getPointeeType());
}
TemplateTypeParmDecl *VisitArrayType(const ArrayType *T) {
return Visit(T->getElementType());
}
TemplateTypeParmDecl *VisitDependentSizedExtVectorType(
const DependentSizedExtVectorType *T) {
return Visit(T->getElementType());
}
TemplateTypeParmDecl *VisitVectorType(const VectorType *T) {
return Visit(T->getElementType());
}
TemplateTypeParmDecl *VisitFunctionProtoType(const FunctionProtoType *T) {
return VisitFunctionType(T);
}
TemplateTypeParmDecl *VisitFunctionType(const FunctionType *T) {
return Visit(T->getReturnType());
}
TemplateTypeParmDecl *VisitParenType(const ParenType *T) {
return Visit(T->getInnerType());
}
TemplateTypeParmDecl *VisitAttributedType(const AttributedType *T) {
return Visit(T->getModifiedType());
}
TemplateTypeParmDecl *VisitMacroQualifiedType(const MacroQualifiedType *T) {
return Visit(T->getUnderlyingType());
}
TemplateTypeParmDecl *VisitAdjustedType(const AdjustedType *T) {
return Visit(T->getOriginalType());
}
TemplateTypeParmDecl *VisitPackExpansionType(const PackExpansionType *T) {
return Visit(T->getPattern());
}
};
} // namespace
bool Sema::SubstTypeConstraint(
TemplateTypeParmDecl *Inst, const TypeConstraint *TC,
const MultiLevelTemplateArgumentList &TemplateArgs,
bool EvaluateConstraints) {
const ASTTemplateArgumentListInfo *TemplArgInfo =
TC->getTemplateArgsAsWritten();
if (!EvaluateConstraints) {
UnsignedOrNone Index = TC->getArgPackSubstIndex();
if (!Index)
Index = SemaRef.ArgPackSubstIndex;
Inst->setTypeConstraint(TC->getConceptReference(),
TC->getImmediatelyDeclaredConstraint(), Index);
return false;
}
TemplateArgumentListInfo InstArgs;
if (TemplArgInfo) {
InstArgs.setLAngleLoc(TemplArgInfo->LAngleLoc);
InstArgs.setRAngleLoc(TemplArgInfo->RAngleLoc);
if (SubstTemplateArguments(TemplArgInfo->arguments(), TemplateArgs,
InstArgs))
return true;
}
return AttachTypeConstraint(
TC->getNestedNameSpecifierLoc(), TC->getConceptNameInfo(),
TC->getNamedConcept(),
/*FoundDecl=*/TC->getConceptReference()->getFoundDecl(), &InstArgs, Inst,
Inst->isParameterPack()
? cast<CXXFoldExpr>(TC->getImmediatelyDeclaredConstraint())
->getEllipsisLoc()
: SourceLocation());
}
ParmVarDecl *
Sema::SubstParmVarDecl(ParmVarDecl *OldParm,
const MultiLevelTemplateArgumentList &TemplateArgs,
int indexAdjustment, UnsignedOrNone NumExpansions,
bool ExpectParameterPack, bool EvaluateConstraint) {
TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo();
TypeSourceInfo *NewDI = nullptr;
TypeLoc OldTL = OldDI->getTypeLoc();
if (PackExpansionTypeLoc ExpansionTL = OldTL.getAs<PackExpansionTypeLoc>()) {
// We have a function parameter pack. Substitute into the pattern of the
// expansion.
NewDI = SubstType(ExpansionTL.getPatternLoc(), TemplateArgs,
OldParm->getLocation(), OldParm->getDeclName());
if (!NewDI)
return nullptr;
if (NewDI->getType()->containsUnexpandedParameterPack()) {
// We still have unexpanded parameter packs, which means that
// our function parameter is still a function parameter pack.
// Therefore, make its type a pack expansion type.
NewDI = CheckPackExpansion(NewDI, ExpansionTL.getEllipsisLoc(),
NumExpansions);
} else if (ExpectParameterPack) {
// We expected to get a parameter pack but didn't (because the type
// itself is not a pack expansion type), so complain. This can occur when
// the substitution goes through an alias template that "loses" the
// pack expansion.
Diag(OldParm->getLocation(),
diag::err_function_parameter_pack_without_parameter_packs)
<< NewDI->getType();
return nullptr;
}
} else {
NewDI = SubstType(OldDI, TemplateArgs, OldParm->getLocation(),
OldParm->getDeclName());
}
if (!NewDI)
return nullptr;
if (NewDI->getType()->isVoidType()) {
Diag(OldParm->getLocation(), diag::err_param_with_void_type);
return nullptr;
}
// In abbreviated templates, TemplateTypeParmDecls with possible
// TypeConstraints are created when the parameter list is originally parsed.
// The TypeConstraints can therefore reference other functions parameters in
// the abbreviated function template, which is why we must instantiate them
// here, when the instantiated versions of those referenced parameters are in
// scope.
if (TemplateTypeParmDecl *TTP =
GetContainedInventedTypeParmVisitor().Visit(OldDI->getType())) {
if (const TypeConstraint *TC = TTP->getTypeConstraint()) {
auto *Inst = cast_or_null<TemplateTypeParmDecl>(
FindInstantiatedDecl(TTP->getLocation(), TTP, TemplateArgs));
// We will first get here when instantiating the abbreviated function
// template's described function, but we might also get here later.
// Make sure we do not instantiate the TypeConstraint more than once.
if (Inst && !Inst->getTypeConstraint()) {
if (SubstTypeConstraint(Inst, TC, TemplateArgs, EvaluateConstraint))
return nullptr;
}
}
}
ParmVarDecl *NewParm = CheckParameter(Context.getTranslationUnitDecl(),
OldParm->getInnerLocStart(),
OldParm->getLocation(),
OldParm->getIdentifier(),
NewDI->getType(), NewDI,
OldParm->getStorageClass());
if (!NewParm)
return nullptr;
// Mark the (new) default argument as uninstantiated (if any).
if (OldParm->hasUninstantiatedDefaultArg()) {
Expr *Arg = OldParm->getUninstantiatedDefaultArg();
NewParm->setUninstantiatedDefaultArg(Arg);
} else if (OldParm->hasUnparsedDefaultArg()) {
NewParm->setUnparsedDefaultArg();
UnparsedDefaultArgInstantiations[OldParm].push_back(NewParm);
} else if (Expr *Arg = OldParm->getDefaultArg()) {
// Default arguments cannot be substituted until the declaration context
// for the associated function or lambda capture class is available.
// This is necessary for cases like the following where construction of
// the lambda capture class for the outer lambda is dependent on the
// parameter types but where the default argument is dependent on the
// outer lambda's declaration context.
// template <typename T>
// auto f() {
// return [](T = []{ return T{}; }()) { return 0; };
// }
NewParm->setUninstantiatedDefaultArg(Arg);
}
NewParm->setExplicitObjectParameterLoc(
OldParm->getExplicitObjectParamThisLoc());
NewParm->setHasInheritedDefaultArg(OldParm->hasInheritedDefaultArg());
if (OldParm->isParameterPack() && !NewParm->isParameterPack()) {
// Add the new parameter to the instantiated parameter pack.
CurrentInstantiationScope->InstantiatedLocalPackArg(OldParm, NewParm);
} else {
// Introduce an Old -> New mapping
CurrentInstantiationScope->InstantiatedLocal(OldParm, NewParm);
}
// FIXME: OldParm may come from a FunctionProtoType, in which case CurContext
// can be anything, is this right ?
NewParm->setDeclContext(CurContext);
NewParm->setScopeInfo(OldParm->getFunctionScopeDepth(),
OldParm->getFunctionScopeIndex() + indexAdjustment);
InstantiateAttrs(TemplateArgs, OldParm, NewParm);
return NewParm;
}
bool Sema::SubstParmTypes(
SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
const MultiLevelTemplateArgumentList &TemplateArgs,
SmallVectorImpl<QualType> &ParamTypes,
SmallVectorImpl<ParmVarDecl *> *OutParams,
ExtParameterInfoBuilder &ParamInfos) {
assert(!CodeSynthesisContexts.empty() &&
"Cannot perform an instantiation without some context on the "
"instantiation stack");
TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
DeclarationName());
return Instantiator.TransformFunctionTypeParams(
Loc, Params, nullptr, ExtParamInfos, ParamTypes, OutParams, ParamInfos);
}
bool Sema::SubstDefaultArgument(
SourceLocation Loc,
ParmVarDecl *Param,
const MultiLevelTemplateArgumentList &TemplateArgs,
bool ForCallExpr) {
FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext());
Expr *PatternExpr = Param->getUninstantiatedDefaultArg();
EnterExpressionEvaluationContext EvalContext(
*this, ExpressionEvaluationContext::PotentiallyEvaluated, Param);
InstantiatingTemplate Inst(*this, Loc, Param, TemplateArgs.getInnermost());
if (Inst.isInvalid())
return true;
if (Inst.isAlreadyInstantiating()) {
Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD;
Param->setInvalidDecl();
return true;
}
ExprResult Result;
{
// C++ [dcl.fct.default]p5:
// The names in the [default argument] expression are bound, and
// the semantic constraints are checked, at the point where the
// default argument expression appears.
ContextRAII SavedContext(*this, FD);
std::unique_ptr<LocalInstantiationScope> LIS;
if (ForCallExpr) {
// When instantiating a default argument due to use in a call expression,
// an instantiation scope that includes the parameters of the callee is
// required to satisfy references from the default argument. For example:
// template<typename T> void f(T a, int = decltype(a)());
// void g() { f(0); }
LIS = std::make_unique<LocalInstantiationScope>(*this);
FunctionDecl *PatternFD = FD->getTemplateInstantiationPattern(
/*ForDefinition*/ false);
if (addInstantiatedParametersToScope(FD, PatternFD, *LIS, TemplateArgs))
return true;
}
runWithSufficientStackSpace(Loc, [&] {
Result = SubstInitializer(PatternExpr, TemplateArgs,
/*DirectInit*/ false);
});
}
if (Result.isInvalid())
return true;
if (ForCallExpr) {
// Check the expression as an initializer for the parameter.
InitializedEntity Entity
= InitializedEntity::InitializeParameter(Context, Param);
InitializationKind Kind = InitializationKind::CreateCopy(
Param->getLocation(),
/*FIXME:EqualLoc*/ PatternExpr->getBeginLoc());
Expr *ResultE = Result.getAs<Expr>();
InitializationSequence InitSeq(*this, Entity, Kind, ResultE);
Result = InitSeq.Perform(*this, Entity, Kind, ResultE);
if (Result.isInvalid())
return true;
Result =
ActOnFinishFullExpr(Result.getAs<Expr>(), Param->getOuterLocStart(),
/*DiscardedValue*/ false);
} else {
// FIXME: Obtain the source location for the '=' token.
SourceLocation EqualLoc = PatternExpr->getBeginLoc();
Result = ConvertParamDefaultArgument(Param, Result.getAs<Expr>(), EqualLoc);
}
if (Result.isInvalid())
return true;
// Remember the instantiated default argument.
Param->setDefaultArg(Result.getAs<Expr>());
return false;
}
bool
Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
CXXRecordDecl *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs) {
bool Invalid = false;
SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases;
for (const auto &Base : Pattern->bases()) {
if (!Base.getType()->isDependentType()) {
if (const CXXRecordDecl *RD = Base.getType()->getAsCXXRecordDecl()) {
if (RD->isInvalidDecl())
Instantiation->setInvalidDecl();
}
InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(Base));
continue;
}
SourceLocation EllipsisLoc;
TypeSourceInfo *BaseTypeLoc;
if (Base.isPackExpansion()) {
// This is a pack expansion. See whether we should expand it now, or
// wait until later.
SmallVector<UnexpandedParameterPack, 2> Unexpanded;
collectUnexpandedParameterPacks(Base.getTypeSourceInfo()->getTypeLoc(),
Unexpanded);
bool ShouldExpand = false;
bool RetainExpansion = false;
UnsignedOrNone NumExpansions = std::nullopt;
if (CheckParameterPacksForExpansion(Base.getEllipsisLoc(),
Base.getSourceRange(),
Unexpanded,
TemplateArgs, ShouldExpand,
RetainExpansion,
NumExpansions)) {
Invalid = true;
continue;
}
// If we should expand this pack expansion now, do so.
if (ShouldExpand) {
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgPackSubstIndexRAII SubstIndex(*this, I);
TypeSourceInfo *BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
TemplateArgs,
Base.getSourceRange().getBegin(),
DeclarationName());
if (!BaseTypeLoc) {
Invalid = true;
continue;
}
if (CXXBaseSpecifier *InstantiatedBase
= CheckBaseSpecifier(Instantiation,
Base.getSourceRange(),
Base.isVirtual(),
Base.getAccessSpecifierAsWritten(),
BaseTypeLoc,
SourceLocation()))
InstantiatedBases.push_back(InstantiatedBase);
else
Invalid = true;
}
continue;
}
// The resulting base specifier will (still) be a pack expansion.
EllipsisLoc = Base.getEllipsisLoc();
Sema::ArgPackSubstIndexRAII SubstIndex(*this, std::nullopt);
BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
TemplateArgs,
Base.getSourceRange().getBegin(),
DeclarationName());
} else {
BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
TemplateArgs,
Base.getSourceRange().getBegin(),
DeclarationName());
}
if (!BaseTypeLoc) {
Invalid = true;
continue;
}
if (CXXBaseSpecifier *InstantiatedBase
= CheckBaseSpecifier(Instantiation,
Base.getSourceRange(),
Base.isVirtual(),
Base.getAccessSpecifierAsWritten(),
BaseTypeLoc,
EllipsisLoc))
InstantiatedBases.push_back(InstantiatedBase);
else
Invalid = true;
}
if (!Invalid && AttachBaseSpecifiers(Instantiation, InstantiatedBases))
Invalid = true;
return Invalid;
}
// Defined via #include from SemaTemplateInstantiateDecl.cpp
namespace clang {
namespace sema {
Attr *instantiateTemplateAttribute(const Attr *At, ASTContext &C, Sema &S,
const MultiLevelTemplateArgumentList &TemplateArgs);
Attr *instantiateTemplateAttributeForDecl(
const Attr *At, ASTContext &C, Sema &S,
const MultiLevelTemplateArgumentList &TemplateArgs);
}
}
bool
Sema::InstantiateClass(SourceLocation PointOfInstantiation,
CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateSpecializationKind TSK,
bool Complain) {
CXXRecordDecl *PatternDef
= cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation,
Instantiation->getInstantiatedFromMemberClass(),
Pattern, PatternDef, TSK, Complain))
return true;
llvm::TimeTraceScope TimeScope("InstantiateClass", [&]() {
llvm::TimeTraceMetadata M;
llvm::raw_string_ostream OS(M.Detail);
Instantiation->getNameForDiagnostic(OS, getPrintingPolicy(),
/*Qualified=*/true);
if (llvm::isTimeTraceVerbose()) {
auto Loc = SourceMgr.getExpansionLoc(Instantiation->getLocation());
M.File = SourceMgr.getFilename(Loc);
M.Line = SourceMgr.getExpansionLineNumber(Loc);
}
return M;
});
Pattern = PatternDef;
// Record the point of instantiation.
if (MemberSpecializationInfo *MSInfo
= Instantiation->getMemberSpecializationInfo()) {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
} else if (ClassTemplateSpecializationDecl *Spec
= dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) {
Spec->setTemplateSpecializationKind(TSK);
Spec->setPointOfInstantiation(PointOfInstantiation);
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
if (Inst.isInvalid())
return true;
assert(!Inst.isAlreadyInstantiating() && "should have been caught by caller");
PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(),
"instantiating class definition");
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
ContextRAII SavedContext(*this, Instantiation);
EnterExpressionEvaluationContext EvalContext(
*this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
// If this is an instantiation of a local class, merge this local
// instantiation scope with the enclosing scope. Otherwise, every
// instantiation of a class has its own local instantiation scope.
bool MergeWithParentScope = !Instantiation->isDefinedOutsideFunctionOrMethod();
LocalInstantiationScope Scope(*this, MergeWithParentScope);
// Some class state isn't processed immediately but delayed till class
// instantiation completes. We may not be ready to handle any delayed state
// already on the stack as it might correspond to a different class, so save
// it now and put it back later.
SavePendingParsedClassStateRAII SavedPendingParsedClassState(*this);
// Pull attributes from the pattern onto the instantiation.
InstantiateAttrs(TemplateArgs, Pattern, Instantiation);
// Start the definition of this instantiation.
Instantiation->startDefinition();
// The instantiation is visible here, even if it was first declared in an
// unimported module.
Instantiation->setVisibleDespiteOwningModule();
// FIXME: This loses the as-written tag kind for an explicit instantiation.
Instantiation->setTagKind(Pattern->getTagKind());
// Do substitution on the base class specifiers.
if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs))
Instantiation->setInvalidDecl();
TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs);
Instantiator.setEvaluateConstraints(false);
SmallVector<Decl*, 4> Fields;
// Delay instantiation of late parsed attributes.
LateInstantiatedAttrVec LateAttrs;
Instantiator.enableLateAttributeInstantiation(&LateAttrs);
bool MightHaveConstexprVirtualFunctions = false;
for (auto *Member : Pattern->decls()) {
// Don't instantiate members not belonging in this semantic context.
// e.g. for:
// @code
// template <int i> class A {
// class B *g;
// };
// @endcode
// 'class B' has the template as lexical context but semantically it is
// introduced in namespace scope.
if (Member->getDeclContext() != Pattern)
continue;
// BlockDecls can appear in a default-member-initializer. They must be the
// child of a BlockExpr, so we only know how to instantiate them from there.
// Similarly, lambda closure types are recreated when instantiating the
// corresponding LambdaExpr.
if (isa<BlockDecl>(Member) ||
(isa<CXXRecordDecl>(Member) && cast<CXXRecordDecl>(Member)->isLambda()))
continue;
if (Member->isInvalidDecl()) {
Instantiation->setInvalidDecl();
continue;
}
Decl *NewMember = Instantiator.Visit(Member);
if (NewMember) {
if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) {
Fields.push_back(Field);
} else if (EnumDecl *Enum = dyn_cast<EnumDecl>(NewMember)) {
// C++11 [temp.inst]p1: The implicit instantiation of a class template
// specialization causes the implicit instantiation of the definitions
// of unscoped member enumerations.
// Record a point of instantiation for this implicit instantiation.
if (TSK == TSK_ImplicitInstantiation && !Enum->isScoped() &&
Enum->isCompleteDefinition()) {
MemberSpecializationInfo *MSInfo =Enum->getMemberSpecializationInfo();
assert(MSInfo && "no spec info for member enum specialization");
MSInfo->setTemplateSpecializationKind(TSK_ImplicitInstantiation);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
} else if (StaticAssertDecl *SA = dyn_cast<StaticAssertDecl>(NewMember)) {
if (SA->isFailed()) {
// A static_assert failed. Bail out; instantiating this
// class is probably not meaningful.
Instantiation->setInvalidDecl();
break;
}
} else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewMember)) {
if (MD->isConstexpr() && !MD->getFriendObjectKind() &&
(MD->isVirtualAsWritten() || Instantiation->getNumBases()))
MightHaveConstexprVirtualFunctions = true;
}
if (NewMember->isInvalidDecl())
Instantiation->setInvalidDecl();
} else {
// FIXME: Eventually, a NULL return will mean that one of the
// instantiations was a semantic disaster, and we'll want to mark the
// declaration invalid.
// For now, we expect to skip some members that we can't yet handle.
}
}
// Finish checking fields.
ActOnFields(nullptr, Instantiation->getLocation(), Instantiation, Fields,
SourceLocation(), SourceLocation(), ParsedAttributesView());
CheckCompletedCXXClass(nullptr, Instantiation);
// Default arguments are parsed, if not instantiated. We can go instantiate
// default arg exprs for default constructors if necessary now. Unless we're
// parsing a class, in which case wait until that's finished.
if (ParsingClassDepth == 0)
ActOnFinishCXXNonNestedClass();
// Instantiate late parsed attributes, and attach them to their decls.
// See Sema::InstantiateAttrs
for (LateInstantiatedAttrVec::iterator I = LateAttrs.begin(),
E = LateAttrs.end(); I != E; ++I) {
assert(CurrentInstantiationScope == Instantiator.getStartingScope());
CurrentInstantiationScope = I->Scope;
// Allow 'this' within late-parsed attributes.
auto *ND = cast<NamedDecl>(I->NewDecl);
auto *ThisContext = dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
CXXThisScopeRAII ThisScope(*this, ThisContext, Qualifiers(),
ND->isCXXInstanceMember());
Attr *NewAttr =
instantiateTemplateAttribute(I->TmplAttr, Context, *this, TemplateArgs);
if (NewAttr)
I->NewDecl->addAttr(NewAttr);
LocalInstantiationScope::deleteScopes(I->Scope,
Instantiator.getStartingScope());
}
Instantiator.disableLateAttributeInstantiation();
LateAttrs.clear();
ActOnFinishDelayedMemberInitializers(Instantiation);
// FIXME: We should do something similar for explicit instantiations so they
// end up in the right module.
if (TSK == TSK_ImplicitInstantiation) {
Instantiation->setLocation(Pattern->getLocation());
Instantiation->setLocStart(Pattern->getInnerLocStart());
Instantiation->setBraceRange(Pattern->getBraceRange());
}
if (!Instantiation->isInvalidDecl()) {
// Perform any dependent diagnostics from the pattern.
if (Pattern->isDependentContext())
PerformDependentDiagnostics(Pattern, TemplateArgs);
// Instantiate any out-of-line class template partial
// specializations now.
for (TemplateDeclInstantiator::delayed_partial_spec_iterator
P = Instantiator.delayed_partial_spec_begin(),
PEnd = Instantiator.delayed_partial_spec_end();
P != PEnd; ++P) {
if (!Instantiator.InstantiateClassTemplatePartialSpecialization(
P->first, P->second)) {
Instantiation->setInvalidDecl();
break;
}
}
// Instantiate any out-of-line variable template partial
// specializations now.
for (TemplateDeclInstantiator::delayed_var_partial_spec_iterator
P = Instantiator.delayed_var_partial_spec_begin(),
PEnd = Instantiator.delayed_var_partial_spec_end();
P != PEnd; ++P) {
if (!Instantiator.InstantiateVarTemplatePartialSpecialization(
P->first, P->second)) {
Instantiation->setInvalidDecl();
break;
}
}
}
// Exit the scope of this instantiation.
SavedContext.pop();
if (!Instantiation->isInvalidDecl()) {
// Always emit the vtable for an explicit instantiation definition
// of a polymorphic class template specialization. Otherwise, eagerly
// instantiate only constexpr virtual functions in preparation for their use
// in constant evaluation.
if (TSK == TSK_ExplicitInstantiationDefinition)
MarkVTableUsed(PointOfInstantiation, Instantiation, true);
else if (MightHaveConstexprVirtualFunctions)
MarkVirtualMembersReferenced(PointOfInstantiation, Instantiation,
/*ConstexprOnly*/ true);
}
Consumer.HandleTagDeclDefinition(Instantiation);
return Instantiation->isInvalidDecl();
}
bool Sema::InstantiateEnum(SourceLocation PointOfInstantiation,
EnumDecl *Instantiation, EnumDecl *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateSpecializationKind TSK) {
EnumDecl *PatternDef = Pattern->getDefinition();
if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation,
Instantiation->getInstantiatedFromMemberEnum(),
Pattern, PatternDef, TSK,/*Complain*/true))
return true;
Pattern = PatternDef;
// Record the point of instantiation.
if (MemberSpecializationInfo *MSInfo
= Instantiation->getMemberSpecializationInfo()) {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
if (Inst.isInvalid())
return true;
if (Inst.isAlreadyInstantiating())
return false;
PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(),
"instantiating enum definition");
// The instantiation is visible here, even if it was first declared in an
// unimported module.
Instantiation->setVisibleDespiteOwningModule();
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
ContextRAII SavedContext(*this, Instantiation);
EnterExpressionEvaluationContext EvalContext(
*this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
LocalInstantiationScope Scope(*this, /*MergeWithParentScope*/true);
// Pull attributes from the pattern onto the instantiation.
InstantiateAttrs(TemplateArgs, Pattern, Instantiation);
TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs);
Instantiator.InstantiateEnumDefinition(Instantiation, Pattern);
// Exit the scope of this instantiation.
SavedContext.pop();
return Instantiation->isInvalidDecl();
}
bool Sema::InstantiateInClassInitializer(
SourceLocation PointOfInstantiation, FieldDecl *Instantiation,
FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs) {
// If there is no initializer, we don't need to do anything.
if (!Pattern->hasInClassInitializer())
return false;
assert(Instantiation->getInClassInitStyle() ==
Pattern->getInClassInitStyle() &&
"pattern and instantiation disagree about init style");
// Error out if we haven't parsed the initializer of the pattern yet because
// we are waiting for the closing brace of the outer class.
Expr *OldInit = Pattern->getInClassInitializer();
if (!OldInit) {
RecordDecl *PatternRD = Pattern->getParent();
RecordDecl *OutermostClass = PatternRD->getOuterLexicalRecordContext();
Diag(PointOfInstantiation,
diag::err_default_member_initializer_not_yet_parsed)
<< OutermostClass << Pattern;
Diag(Pattern->getEndLoc(),
diag::note_default_member_initializer_not_yet_parsed);
Instantiation->setInvalidDecl();
return true;
}
InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);
if (Inst.isInvalid())
return true;
if (Inst.isAlreadyInstantiating()) {
// Error out if we hit an instantiation cycle for this initializer.
Diag(PointOfInstantiation, diag::err_default_member_initializer_cycle)
<< Instantiation;
return true;
}
PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(),
"instantiating default member init");
// Enter the scope of this instantiation. We don't use PushDeclContext because
// we don't have a scope.
ContextRAII SavedContext(*this, Instantiation->getParent());
EnterExpressionEvaluationContext EvalContext(
*this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
ExprEvalContexts.back().DelayedDefaultInitializationContext = {
PointOfInstantiation, Instantiation, CurContext};
LocalInstantiationScope Scope(*this, true);
// Instantiate the initializer.
ActOnStartCXXInClassMemberInitializer();
CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), Qualifiers());
ExprResult NewInit = SubstInitializer(OldInit, TemplateArgs,
/*CXXDirectInit=*/false);
Expr *Init = NewInit.get();
assert((!Init || !isa<ParenListExpr>(Init)) && "call-style init in class");
ActOnFinishCXXInClassMemberInitializer(
Instantiation, Init ? Init->getBeginLoc() : SourceLocation(), Init);
if (auto *L = getASTMutationListener())
L->DefaultMemberInitializerInstantiated(Instantiation);
// Return true if the in-class initializer is still missing.
return !Instantiation->getInClassInitializer();
}
namespace {
/// A partial specialization whose template arguments have matched
/// a given template-id.
struct PartialSpecMatchResult {
ClassTemplatePartialSpecializationDecl *Partial;
TemplateArgumentList *Args;
};
}
bool Sema::usesPartialOrExplicitSpecialization(
SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec) {
if (ClassTemplateSpec->getTemplateSpecializationKind() ==
TSK_ExplicitSpecialization)
return true;
SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
ClassTemplateDecl *CTD = ClassTemplateSpec->getSpecializedTemplate();
CTD->getPartialSpecializations(PartialSpecs);
for (ClassTemplatePartialSpecializationDecl *CTPSD : PartialSpecs) {
// C++ [temp.spec.partial.member]p2:
// If the primary member template is explicitly specialized for a given
// (implicit) specialization of the enclosing class template, the partial
// specializations of the member template are ignored for this
// specialization of the enclosing class template. If a partial
// specialization of the member template is explicitly specialized for a
// given (implicit) specialization of the enclosing class template, the
// primary member template and its other partial specializations are still
// considered for this specialization of the enclosing class template.
if (CTD->getMostRecentDecl()->isMemberSpecialization() &&
!CTPSD->getMostRecentDecl()->isMemberSpecialization())
continue;
TemplateDeductionInfo Info(Loc);
if (DeduceTemplateArguments(CTPSD,
ClassTemplateSpec->getTemplateArgs().asArray(),
Info) == TemplateDeductionResult::Success)
return true;
}
return false;
}
/// Get the instantiation pattern to use to instantiate the definition of a
/// given ClassTemplateSpecializationDecl (either the pattern of the primary
/// template or of a partial specialization).
static ActionResult<CXXRecordDecl *> getPatternForClassTemplateSpecialization(
Sema &S, SourceLocation PointOfInstantiation,
ClassTemplateSpecializationDecl *ClassTemplateSpec,
TemplateSpecializationKind TSK, bool PrimaryStrictPackMatch) {
Sema::InstantiatingTemplate Inst(S, PointOfInstantiation, ClassTemplateSpec);
if (Inst.isInvalid())
return {/*Invalid=*/true};
if (Inst.isAlreadyInstantiating())
return {/*Invalid=*/false};
llvm::PointerUnion<ClassTemplateDecl *,
ClassTemplatePartialSpecializationDecl *>
Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial();
if (!isa<ClassTemplatePartialSpecializationDecl *>(Specialized)) {
// Find best matching specialization.
ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate();
// C++ [temp.class.spec.match]p1:
// When a class template is used in a context that requires an
// instantiation of the class, it is necessary to determine
// whether the instantiation is to be generated using the primary
// template or one of the partial specializations. This is done by
// matching the template arguments of the class template
// specialization with the template argument lists of the partial
// specializations.
typedef PartialSpecMatchResult MatchResult;
SmallVector<MatchResult, 4> Matched, ExtraMatched;
SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
Template->getPartialSpecializations(PartialSpecs);
TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation);
for (ClassTemplatePartialSpecializationDecl *Partial : PartialSpecs) {
// C++ [temp.spec.partial.member]p2:
// If the primary member template is explicitly specialized for a given
// (implicit) specialization of the enclosing class template, the
// partial specializations of the member template are ignored for this
// specialization of the enclosing class template. If a partial
// specialization of the member template is explicitly specialized for a
// given (implicit) specialization of the enclosing class template, the
// primary member template and its other partial specializations are
// still considered for this specialization of the enclosing class
// template.
if (Template->getMostRecentDecl()->isMemberSpecialization() &&
!Partial->getMostRecentDecl()->isMemberSpecialization())
continue;
TemplateDeductionInfo Info(FailedCandidates.getLocation());
if (TemplateDeductionResult Result = S.DeduceTemplateArguments(
Partial, ClassTemplateSpec->getTemplateArgs().asArray(), Info);
Result != TemplateDeductionResult::Success) {
// Store the failed-deduction information for use in diagnostics, later.
// TODO: Actually use the failed-deduction info?
FailedCandidates.addCandidate().set(
DeclAccessPair::make(Template, AS_public), Partial,
MakeDeductionFailureInfo(S.Context, Result, Info));
(void)Result;
} else {
auto &List = Info.hasStrictPackMatch() ? ExtraMatched : Matched;
List.push_back(MatchResult{Partial, Info.takeCanonical()});
}
}
if (Matched.empty() && PrimaryStrictPackMatch)
Matched = std::move(ExtraMatched);
// If we're dealing with a member template where the template parameters
// have been instantiated, this provides the original template parameters
// from which the member template's parameters were instantiated.
if (Matched.size() >= 1) {
SmallVectorImpl<MatchResult>::iterator Best = Matched.begin();
if (Matched.size() == 1) {
// -- If exactly one matching specialization is found, the
// instantiation is generated from that specialization.
// We don't need to do anything for this.
} else {
// -- If more than one matching specialization is found, the
// partial order rules (14.5.4.2) are used to determine
// whether one of the specializations is more specialized
// than the others. If none of the specializations is more
// specialized than all of the other matching
// specializations, then the use of the class template is
// ambiguous and the program is ill-formed.
for (SmallVectorImpl<MatchResult>::iterator P = Best + 1,
PEnd = Matched.end();
P != PEnd; ++P) {
if (S.getMoreSpecializedPartialSpecialization(
P->Partial, Best->Partial, PointOfInstantiation) ==
P->Partial)
Best = P;
}
// Determine if the best partial specialization is more specialized than
// the others.
bool Ambiguous = false;
for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(),
PEnd = Matched.end();
P != PEnd; ++P) {
if (P != Best && S.getMoreSpecializedPartialSpecialization(
P->Partial, Best->Partial,
PointOfInstantiation) != Best->Partial) {
Ambiguous = true;
break;
}
}
if (Ambiguous) {
// Partial ordering did not produce a clear winner. Complain.
Inst.Clear();
ClassTemplateSpec->setInvalidDecl();
S.Diag(PointOfInstantiation,
diag::err_partial_spec_ordering_ambiguous)
<< ClassTemplateSpec;
// Print the matching partial specializations.
for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(),
PEnd = Matched.end();
P != PEnd; ++P)
S.Diag(P->Partial->getLocation(), diag::note_partial_spec_match)
<< S.getTemplateArgumentBindingsText(
P->Partial->getTemplateParameters(), *P->Args);
return {/*Invalid=*/true};
}
}
ClassTemplateSpec->setInstantiationOf(Best->Partial, Best->Args);
} else {
// -- If no matches are found, the instantiation is generated
// from the primary template.
}
}
CXXRecordDecl *Pattern = nullptr;
Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial();
if (auto *PartialSpec =
Specialized.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) {
// Instantiate using the best class template partial specialization.
while (PartialSpec->getInstantiatedFromMember()) {
// If we've found an explicit specialization of this class template,
// stop here and use that as the pattern.
if (PartialSpec->isMemberSpecialization())
break;
PartialSpec = PartialSpec->getInstantiatedFromMember();
}
Pattern = PartialSpec;
} else {
ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate();
while (Template->getInstantiatedFromMemberTemplate()) {
// If we've found an explicit specialization of this class template,
// stop here and use that as the pattern.
if (Template->isMemberSpecialization())
break;
Template = Template->getInstantiatedFromMemberTemplate();
}
Pattern = Template->getTemplatedDecl();
}
return Pattern;
}
bool Sema::InstantiateClassTemplateSpecialization(
SourceLocation PointOfInstantiation,
ClassTemplateSpecializationDecl *ClassTemplateSpec,
TemplateSpecializationKind TSK, bool Complain,
bool PrimaryStrictPackMatch) {
// Perform the actual instantiation on the canonical declaration.
ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>(
ClassTemplateSpec->getCanonicalDecl());
if (ClassTemplateSpec->isInvalidDecl())
return true;
ActionResult<CXXRecordDecl *> Pattern =
getPatternForClassTemplateSpecialization(*this, PointOfInstantiation,
ClassTemplateSpec, TSK,
PrimaryStrictPackMatch);
if (!Pattern.isUsable())
return Pattern.isInvalid();
return InstantiateClass(
PointOfInstantiation, ClassTemplateSpec, Pattern.get(),
getTemplateInstantiationArgs(ClassTemplateSpec), TSK, Complain);
}
void
Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation,
CXXRecordDecl *Instantiation,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateSpecializationKind TSK) {
// FIXME: We need to notify the ASTMutationListener that we did all of these
// things, in case we have an explicit instantiation definition in a PCM, a
// module, or preamble, and the declaration is in an imported AST.
assert(
(TSK == TSK_ExplicitInstantiationDefinition ||
TSK == TSK_ExplicitInstantiationDeclaration ||
(TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) &&
"Unexpected template specialization kind!");
for (auto *D : Instantiation->decls()) {
bool SuppressNew = false;
if (auto *Function = dyn_cast<FunctionDecl>(D)) {
if (FunctionDecl *Pattern =
Function->getInstantiatedFromMemberFunction()) {
if (Function->isIneligibleOrNotSelected())
continue;
if (Function->getTrailingRequiresClause()) {
ConstraintSatisfaction Satisfaction;
if (CheckFunctionConstraints(Function, Satisfaction) ||
!Satisfaction.IsSatisfied) {
continue;
}
}
if (Function->hasAttr<ExcludeFromExplicitInstantiationAttr>())
continue;
TemplateSpecializationKind PrevTSK =
Function->getTemplateSpecializationKind();
if (PrevTSK == TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(
PointOfInstantiation, TSK, Function, PrevTSK,
Function->getPointOfInstantiation(), SuppressNew) ||
SuppressNew)
continue;
// C++11 [temp.explicit]p8:
// An explicit instantiation definition that names a class template
// specialization explicitly instantiates the class template
// specialization and is only an explicit instantiation definition
// of members whose definition is visible at the point of
// instantiation.
if (TSK == TSK_ExplicitInstantiationDefinition && !Pattern->isDefined())
continue;
Function->setTemplateSpecializationKind(TSK, PointOfInstantiation);
if (Function->isDefined()) {
// Let the ASTConsumer know that this function has been explicitly
// instantiated now, and its linkage might have changed.
Consumer.HandleTopLevelDecl(DeclGroupRef(Function));
} else if (TSK == TSK_ExplicitInstantiationDefinition) {
InstantiateFunctionDefinition(PointOfInstantiation, Function);
} else if (TSK == TSK_ImplicitInstantiation) {
PendingLocalImplicitInstantiations.push_back(
std::make_pair(Function, PointOfInstantiation));
}
}
} else if (auto *Var = dyn_cast<VarDecl>(D)) {
if (isa<VarTemplateSpecializationDecl>(Var))
continue;
if (Var->isStaticDataMember()) {
if (Var->hasAttr<ExcludeFromExplicitInstantiationAttr>())
continue;
MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
Var,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(),
SuppressNew) ||
SuppressNew)
continue;
if (TSK == TSK_ExplicitInstantiationDefinition) {
// C++0x [temp.explicit]p8:
// An explicit instantiation definition that names a class template
// specialization explicitly instantiates the class template
// specialization and is only an explicit instantiation definition
// of members whose definition is visible at the point of
// instantiation.
if (!Var->getInstantiatedFromStaticDataMember()->getDefinition())
continue;
Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
InstantiateVariableDefinition(PointOfInstantiation, Var);
} else {
Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
}
}
} else if (auto *Record = dyn_cast<CXXRecordDecl>(D)) {
if (Record->hasAttr<ExcludeFromExplicitInstantiationAttr>())
continue;
// Always skip the injected-class-name, along with any
// redeclarations of nested classes, since both would cause us
// to try to instantiate the members of a class twice.
// Skip closure types; they'll get instantiated when we instantiate
// the corresponding lambda-expression.
if (Record->isInjectedClassName() || Record->getPreviousDecl() ||
Record->isLambda())
continue;
MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (Context.getTargetInfo().getTriple().isOSWindows() &&
TSK == TSK_ExplicitInstantiationDeclaration) {
// On Windows, explicit instantiation decl of the outer class doesn't
// affect the inner class. Typically extern template declarations are
// used in combination with dll import/export annotations, but those
// are not propagated from the outer class templates to inner classes.
// Therefore, do not instantiate inner classes on this platform, so
// that users don't end up with undefined symbols during linking.
continue;
}
if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,
Record,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(),
SuppressNew) ||
SuppressNew)
continue;
CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass();
assert(Pattern && "Missing instantiated-from-template information");
if (!Record->getDefinition()) {
if (!Pattern->getDefinition()) {
// C++0x [temp.explicit]p8:
// An explicit instantiation definition that names a class template
// specialization explicitly instantiates the class template
// specialization and is only an explicit instantiation definition
// of members whose definition is visible at the point of
// instantiation.
if (TSK == TSK_ExplicitInstantiationDeclaration) {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
continue;
}
InstantiateClass(PointOfInstantiation, Record, Pattern,
TemplateArgs,
TSK);
} else {
if (TSK == TSK_ExplicitInstantiationDefinition &&
Record->getTemplateSpecializationKind() ==
TSK_ExplicitInstantiationDeclaration) {
Record->setTemplateSpecializationKind(TSK);
MarkVTableUsed(PointOfInstantiation, Record, true);
}
}
Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition());
if (Pattern)
InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs,
TSK);
} else if (auto *Enum = dyn_cast<EnumDecl>(D)) {
MemberSpecializationInfo *MSInfo = Enum->getMemberSpecializationInfo();
assert(MSInfo && "No member specialization information?");
if (MSInfo->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization)
continue;
if (CheckSpecializationInstantiationRedecl(
PointOfInstantiation, TSK, Enum,
MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation(), SuppressNew) ||
SuppressNew)
continue;
if (Enum->getDefinition())
continue;
EnumDecl *Pattern = Enum->getTemplateInstantiationPattern();
assert(Pattern && "Missing instantiated-from-template information");
if (TSK == TSK_ExplicitInstantiationDefinition) {
if (!Pattern->getDefinition())
continue;
InstantiateEnum(PointOfInstantiation, Enum, Pattern, TemplateArgs, TSK);
} else {
MSInfo->setTemplateSpecializationKind(TSK);
MSInfo->setPointOfInstantiation(PointOfInstantiation);
}
} else if (auto *Field = dyn_cast<FieldDecl>(D)) {
// No need to instantiate in-class initializers during explicit
// instantiation.
if (Field->hasInClassInitializer() && TSK == TSK_ImplicitInstantiation) {
CXXRecordDecl *ClassPattern =
Instantiation->getTemplateInstantiationPattern();
DeclContext::lookup_result Lookup =
ClassPattern->lookup(Field->getDeclName());
FieldDecl *Pattern = Lookup.find_first<FieldDecl>();
assert(Pattern);
InstantiateInClassInitializer(PointOfInstantiation, Field, Pattern,
TemplateArgs);
}
}
}
}
void
Sema::InstantiateClassTemplateSpecializationMembers(
SourceLocation PointOfInstantiation,
ClassTemplateSpecializationDecl *ClassTemplateSpec,
TemplateSpecializationKind TSK) {
// C++0x [temp.explicit]p7:
// An explicit instantiation that names a class template
// specialization is an explicit instantion of the same kind
// (declaration or definition) of each of its members (not
// including members inherited from base classes) that has not
// been previously explicitly specialized in the translation unit
// containing the explicit instantiation, except as described
// below.
InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec,
getTemplateInstantiationArgs(ClassTemplateSpec),
TSK);
}
StmtResult
Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!S)
return S;
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformStmt(S);
}
bool Sema::SubstTemplateArgument(
const TemplateArgumentLoc &Input,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateArgumentLoc &Output, SourceLocation Loc,
const DeclarationName &Entity) {
TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity);
return Instantiator.TransformTemplateArgument(Input, Output);
}
bool Sema::SubstTemplateArguments(
ArrayRef<TemplateArgumentLoc> Args,
const MultiLevelTemplateArgumentList &TemplateArgs,
TemplateArgumentListInfo &Out) {
TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(),
DeclarationName());
return Instantiator.TransformTemplateArguments(Args.begin(), Args.end(), Out);
}
ExprResult
Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!E)
return E;
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformExpr(E);
}
ExprResult
Sema::SubstCXXIdExpr(Expr *E,
const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!E)
return E;
TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(),
DeclarationName());
return Instantiator.TransformAddressOfOperand(E);
}
ExprResult
Sema::SubstConstraintExpr(Expr *E,
const MultiLevelTemplateArgumentList &TemplateArgs) {
// FIXME: should call SubstExpr directly if this function is equivalent or
// should it be different?
return SubstExpr(E, TemplateArgs);
}
ExprResult Sema::SubstConstraintExprWithoutSatisfaction(
Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!E)
return E;
TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(),
DeclarationName());
Instantiator.setEvaluateConstraints(false);
return Instantiator.TransformExpr(E);
}
ExprResult Sema::SubstInitializer(Expr *Init,
const MultiLevelTemplateArgumentList &TemplateArgs,
bool CXXDirectInit) {
TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(),
DeclarationName());
return Instantiator.TransformInitializer(Init, CXXDirectInit);
}
bool Sema::SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall,
const MultiLevelTemplateArgumentList &TemplateArgs,
SmallVectorImpl<Expr *> &Outputs) {
if (Exprs.empty())
return false;
TemplateInstantiator Instantiator(*this, TemplateArgs,
SourceLocation(),
DeclarationName());
return Instantiator.TransformExprs(Exprs.data(), Exprs.size(),
IsCall, Outputs);
}
NestedNameSpecifierLoc
Sema::SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
const MultiLevelTemplateArgumentList &TemplateArgs) {
if (!NNS)
return NestedNameSpecifierLoc();
TemplateInstantiator Instantiator(*this, TemplateArgs, NNS.getBeginLoc(),
DeclarationName());
return Instantiator.TransformNestedNameSpecifierLoc(NNS);
}
DeclarationNameInfo
Sema::SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateInstantiator Instantiator(*this, TemplateArgs, NameInfo.getLoc(),
NameInfo.getName());
return Instantiator.TransformDeclarationNameInfo(NameInfo);
}
TemplateName
Sema::SubstTemplateName(NestedNameSpecifierLoc QualifierLoc,
TemplateName Name, SourceLocation Loc,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
DeclarationName());
CXXScopeSpec SS;
SS.Adopt(QualifierLoc);
return Instantiator.TransformTemplateName(SS, Name, Loc);
}
static const Decl *getCanonicalParmVarDecl(const Decl *D) {
// When storing ParmVarDecls in the local instantiation scope, we always
// want to use the ParmVarDecl from the canonical function declaration,
// since the map is then valid for any redeclaration or definition of that
// function.
if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(D)) {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
unsigned i = PV->getFunctionScopeIndex();
// This parameter might be from a freestanding function type within the
// function and isn't necessarily referring to one of FD's parameters.
if (i < FD->getNumParams() && FD->getParamDecl(i) == PV)
return FD->getCanonicalDecl()->getParamDecl(i);
}
}
return D;
}
llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> *
LocalInstantiationScope::findInstantiationOf(const Decl *D) {
D = getCanonicalParmVarDecl(D);
for (LocalInstantiationScope *Current = this; Current;
Current = Current->Outer) {
// Check if we found something within this scope.
const Decl *CheckD = D;
do {
LocalDeclsMap::iterator Found = Current->LocalDecls.find(CheckD);
if (Found != Current->LocalDecls.end())
return &Found->second;
// If this is a tag declaration, it's possible that we need to look for
// a previous declaration.
if (const TagDecl *Tag = dyn_cast<TagDecl>(CheckD))
CheckD = Tag->getPreviousDecl();
else
CheckD = nullptr;
} while (CheckD);
// If we aren't combined with our outer scope, we're done.
if (!Current->CombineWithOuterScope)
break;
}
// If we're performing a partial substitution during template argument
// deduction, we may not have values for template parameters yet.
if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
isa<TemplateTemplateParmDecl>(D))
return nullptr;
// Local types referenced prior to definition may require instantiation.
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D))
if (RD->isLocalClass())
return nullptr;
// Enumeration types referenced prior to definition may appear as a result of
// error recovery.
if (isa<EnumDecl>(D))
return nullptr;
// Materialized typedefs/type alias for implicit deduction guides may require
// instantiation.
if (isa<TypedefNameDecl>(D) &&
isa<CXXDeductionGuideDecl>(D->getDeclContext()))
return nullptr;
// If we didn't find the decl, then we either have a sema bug, or we have a
// forward reference to a label declaration. Return null to indicate that
// we have an uninstantiated label.
assert(isa<LabelDecl>(D) && "declaration not instantiated in this scope");
return nullptr;
}
void LocalInstantiationScope::InstantiatedLocal(const Decl *D, Decl *Inst) {
D = getCanonicalParmVarDecl(D);
llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D];
if (Stored.isNull()) {
#ifndef NDEBUG
// It should not be present in any surrounding scope either.
LocalInstantiationScope *Current = this;
while (Current->CombineWithOuterScope && Current->Outer) {
Current = Current->Outer;
assert(!Current->LocalDecls.contains(D) &&
"Instantiated local in inner and outer scopes");
}
#endif
Stored = Inst;
} else if (DeclArgumentPack *Pack = dyn_cast<DeclArgumentPack *>(Stored)) {
Pack->push_back(cast<ValueDecl>(Inst));
} else {
assert(cast<Decl *>(Stored) == Inst && "Already instantiated this local");
}
}
void LocalInstantiationScope::InstantiatedLocalPackArg(const Decl *D,
VarDecl *Inst) {
D = getCanonicalParmVarDecl(D);
DeclArgumentPack *Pack = cast<DeclArgumentPack *>(LocalDecls[D]);
Pack->push_back(Inst);
}
void LocalInstantiationScope::MakeInstantiatedLocalArgPack(const Decl *D) {
#ifndef NDEBUG
// This should be the first time we've been told about this decl.
for (LocalInstantiationScope *Current = this;
Current && Current->CombineWithOuterScope; Current = Current->Outer)
assert(!Current->LocalDecls.contains(D) &&
"Creating local pack after instantiation of local");
#endif
D = getCanonicalParmVarDecl(D);
llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D];
DeclArgumentPack *Pack = new DeclArgumentPack;
Stored = Pack;
ArgumentPacks.push_back(Pack);
}
bool LocalInstantiationScope::isLocalPackExpansion(const Decl *D) {
for (DeclArgumentPack *Pack : ArgumentPacks)
if (llvm::is_contained(*Pack, D))
return true;
return false;
}
void LocalInstantiationScope::SetPartiallySubstitutedPack(NamedDecl *Pack,
const TemplateArgument *ExplicitArgs,
unsigned NumExplicitArgs) {
assert((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) &&
"Already have a partially-substituted pack");
assert((!PartiallySubstitutedPack
|| NumArgsInPartiallySubstitutedPack == NumExplicitArgs) &&
"Wrong number of arguments in partially-substituted pack");
PartiallySubstitutedPack = Pack;
ArgsInPartiallySubstitutedPack = ExplicitArgs;
NumArgsInPartiallySubstitutedPack = NumExplicitArgs;
}
NamedDecl *LocalInstantiationScope::getPartiallySubstitutedPack(
const TemplateArgument **ExplicitArgs,
unsigned *NumExplicitArgs) const {
if (ExplicitArgs)
*ExplicitArgs = nullptr;
if (NumExplicitArgs)
*NumExplicitArgs = 0;
for (const LocalInstantiationScope *Current = this; Current;
Current = Current->Outer) {
if (Current->PartiallySubstitutedPack) {
if (ExplicitArgs)
*ExplicitArgs = Current->ArgsInPartiallySubstitutedPack;
if (NumExplicitArgs)
*NumExplicitArgs = Current->NumArgsInPartiallySubstitutedPack;
return Current->PartiallySubstitutedPack;
}
if (!Current->CombineWithOuterScope)
break;
}
return nullptr;
}
Reference in New Issue View Git Blame Copy Permalink