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llvm-project/clang/lib/Sema/SemaDecl.cpp
Jordan Rose d393458c33 Add a warning (off by default) for repeated use of the same weak property. 
The motivating example:

if (self.weakProp)
  use(self.weakProp);

As with any non-atomic test-then-use, it is possible a weak property to be
non-nil at the 'if', but be deallocated by the time it is used. The correct
way to write this example is as follows:

id tmp = self.weakProp;
if (tmp)
  use(tmp);

The warning is controlled by -Warc-repeated-use-of-receiver, and uses the
property name and base to determine if the same property on the same object
is being accessed multiple times. In cases where the base is more
complicated than just a single Decl (e.g. 'foo.bar.weakProp'), it picks a
Decl for some degree of uniquing and reports the problem under a subflag,
-Warc-maybe-repeated-use-of-receiver. This gives a way to tune the
aggressiveness of the warning for a particular project.

The warning is not on by default because it is not flow-sensitive and thus
may have a higher-than-acceptable rate of false positives, though it is
less noisy than -Wreceiver-is-weak. On the other hand, it will not warn
about some cases that may be legitimate issues that -Wreceiver-is-weak
will catch, and it does not attempt to reason about methods returning weak
values.

Even though this is not a real "analysis-based" check I've put the bug
emission code in AnalysisBasedWarnings for two reasons: (1) to run on
every kind of code body (function, method, block, or lambda), and (2) to
suggest that it may be enhanced by flow-sensitive analysis in the future.

The second (smaller) half of this work is to extend it to weak locals
and weak ivars. This should use most of the same infrastructure.

Part of <rdar://problem/12280249>

llvm-svn: 164854
2012-09-28 22:21:30 +00:00

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//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for declarations.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/Initialization.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/CXXFieldCollector.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "TypeLocBuilder.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/CommentDiagnostic.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/EvaluatedExprVisitor.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/CharUnits.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/ParsedTemplate.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/ModuleLoader.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Triple.h"
#include <algorithm>
#include <cstring>
#include <functional>
using namespace clang;
using namespace sema;
Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) {
if (OwnedType) {
Decl *Group[2] = { OwnedType, Ptr };
return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2));
}
return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
}
namespace {
class TypeNameValidatorCCC : public CorrectionCandidateCallback {
public:
TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false)
: AllowInvalidDecl(AllowInvalid), WantClassName(WantClass) {
WantExpressionKeywords = false;
WantCXXNamedCasts = false;
WantRemainingKeywords = false;
}
virtual bool ValidateCandidate(const TypoCorrection &candidate) {
if (NamedDecl *ND = candidate.getCorrectionDecl())
return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) &&
(AllowInvalidDecl || !ND->isInvalidDecl());
else
return !WantClassName && candidate.isKeyword();
}
private:
bool AllowInvalidDecl;
bool WantClassName;
};
}
/// \brief Determine whether the token kind starts a simple-type-specifier.
bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const {
switch (Kind) {
// FIXME: Take into account the current language when deciding whether a
// token kind is a valid type specifier
case tok::kw_short:
case tok::kw_long:
case tok::kw___int64:
case tok::kw___int128:
case tok::kw_signed:
case tok::kw_unsigned:
case tok::kw_void:
case tok::kw_char:
case tok::kw_int:
case tok::kw_half:
case tok::kw_float:
case tok::kw_double:
case tok::kw_wchar_t:
case tok::kw_bool:
case tok::kw___underlying_type:
return true;
case tok::annot_typename:
case tok::kw_char16_t:
case tok::kw_char32_t:
case tok::kw_typeof:
case tok::kw_decltype:
return getLangOpts().CPlusPlus;
default:
break;
}
return false;
}
/// \brief If the identifier refers to a type name within this scope,
/// return the declaration of that type.
///
/// This routine performs ordinary name lookup of the identifier II
/// within the given scope, with optional C++ scope specifier SS, to
/// determine whether the name refers to a type. If so, returns an
/// opaque pointer (actually a QualType) corresponding to that
/// type. Otherwise, returns NULL.
///
/// If name lookup results in an ambiguity, this routine will complain
/// and then return NULL.
ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
Scope *S, CXXScopeSpec *SS,
bool isClassName, bool HasTrailingDot,
ParsedType ObjectTypePtr,
bool IsCtorOrDtorName,
bool WantNontrivialTypeSourceInfo,
IdentifierInfo **CorrectedII) {
// Determine where we will perform name lookup.
DeclContext *LookupCtx = 0;
if (ObjectTypePtr) {
QualType ObjectType = ObjectTypePtr.get();
if (ObjectType->isRecordType())
LookupCtx = computeDeclContext(ObjectType);
} else if (SS && SS->isNotEmpty()) {
LookupCtx = computeDeclContext(*SS, false);
if (!LookupCtx) {
if (isDependentScopeSpecifier(*SS)) {
// C++ [temp.res]p3:
// A qualified-id that refers to a type and in which the
// nested-name-specifier depends on a template-parameter (14.6.2)
// shall be prefixed by the keyword typename to indicate that the
// qualified-id denotes a type, forming an
// elaborated-type-specifier (7.1.5.3).
//
// We therefore do not perform any name lookup if the result would
// refer to a member of an unknown specialization.
if (!isClassName && !IsCtorOrDtorName)
return ParsedType();
// We know from the grammar that this name refers to a type,
// so build a dependent node to describe the type.
if (WantNontrivialTypeSourceInfo)
return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
QualType T =
CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
II, NameLoc);
return ParsedType::make(T);
}
return ParsedType();
}
if (!LookupCtx->isDependentContext() &&
RequireCompleteDeclContext(*SS, LookupCtx))
return ParsedType();
}
// FIXME: LookupNestedNameSpecifierName isn't the right kind of
// lookup for class-names.
LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
LookupOrdinaryName;
LookupResult Result(*this, &II, NameLoc, Kind);
if (LookupCtx) {
// Perform "qualified" name lookup into the declaration context we
// computed, which is either the type of the base of a member access
// expression or the declaration context associated with a prior
// nested-name-specifier.
LookupQualifiedName(Result, LookupCtx);
if (ObjectTypePtr && Result.empty()) {
// C++ [basic.lookup.classref]p3:
// If the unqualified-id is ~type-name, the type-name is looked up
// in the context of the entire postfix-expression. If the type T of
// the object expression is of a class type C, the type-name is also
// looked up in the scope of class C. At least one of the lookups shall
// find a name that refers to (possibly cv-qualified) T.
LookupName(Result, S);
}
} else {
// Perform unqualified name lookup.
LookupName(Result, S);
}
NamedDecl *IIDecl = 0;
switch (Result.getResultKind()) {
case LookupResult::NotFound:
case LookupResult::NotFoundInCurrentInstantiation:
if (CorrectedII) {
TypeNameValidatorCCC Validator(true, isClassName);
TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(),
Kind, S, SS, Validator);
IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
TemplateTy Template;
bool MemberOfUnknownSpecialization;
UnqualifiedId TemplateName;
TemplateName.setIdentifier(NewII, NameLoc);
NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
CXXScopeSpec NewSS, *NewSSPtr = SS;
if (SS && NNS) {
NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
NewSSPtr = &NewSS;
}
if (Correction && (NNS || NewII != &II) &&
// Ignore a correction to a template type as the to-be-corrected
// identifier is not a template (typo correction for template names
// is handled elsewhere).
!(getLangOpts().CPlusPlus && NewSSPtr &&
isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(),
false, Template, MemberOfUnknownSpecialization))) {
ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
isClassName, HasTrailingDot, ObjectTypePtr,
IsCtorOrDtorName,
WantNontrivialTypeSourceInfo);
if (Ty) {
std::string CorrectedStr(Correction.getAsString(getLangOpts()));
std::string CorrectedQuotedStr(
Correction.getQuoted(getLangOpts()));
Diag(NameLoc, diag::err_unknown_type_or_class_name_suggest)
<< Result.getLookupName() << CorrectedQuotedStr << isClassName
<< FixItHint::CreateReplacement(SourceRange(NameLoc),
CorrectedStr);
if (NamedDecl *FirstDecl = Correction.getCorrectionDecl())
Diag(FirstDecl->getLocation(), diag::note_previous_decl)
<< CorrectedQuotedStr;
if (SS && NNS)
SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
*CorrectedII = NewII;
return Ty;
}
}
}
// If typo correction failed or was not performed, fall through
case LookupResult::FoundOverloaded:
case LookupResult::FoundUnresolvedValue:
Result.suppressDiagnostics();
return ParsedType();
case LookupResult::Ambiguous:
// Recover from type-hiding ambiguities by hiding the type. We'll
// do the lookup again when looking for an object, and we can
// diagnose the error then. If we don't do this, then the error
// about hiding the type will be immediately followed by an error
// that only makes sense if the identifier was treated like a type.
if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
Result.suppressDiagnostics();
return ParsedType();
}
// Look to see if we have a type anywhere in the list of results.
for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
Res != ResEnd; ++Res) {
if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
if (!IIDecl ||
(*Res)->getLocation().getRawEncoding() <
IIDecl->getLocation().getRawEncoding())
IIDecl = *Res;
}
}
if (!IIDecl) {
// None of the entities we found is a type, so there is no way
// to even assume that the result is a type. In this case, don't
// complain about the ambiguity. The parser will either try to
// perform this lookup again (e.g., as an object name), which
// will produce the ambiguity, or will complain that it expected
// a type name.
Result.suppressDiagnostics();
return ParsedType();
}
// We found a type within the ambiguous lookup; diagnose the
// ambiguity and then return that type. This might be the right
// answer, or it might not be, but it suppresses any attempt to
// perform the name lookup again.
break;
case LookupResult::Found:
IIDecl = Result.getFoundDecl();
break;
}
assert(IIDecl && "Didn't find decl");
QualType T;
if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
DiagnoseUseOfDecl(IIDecl, NameLoc);
if (T.isNull())
T = Context.getTypeDeclType(TD);
// NOTE: avoid constructing an ElaboratedType(Loc) if this is a
// constructor or destructor name (in such a case, the scope specifier
// will be attached to the enclosing Expr or Decl node).
if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) {
if (WantNontrivialTypeSourceInfo) {
// Construct a type with type-source information.
TypeLocBuilder Builder;
Builder.pushTypeSpec(T).setNameLoc(NameLoc);
T = getElaboratedType(ETK_None, *SS, T);
ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
ElabTL.setElaboratedKeywordLoc(SourceLocation());
ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
} else {
T = getElaboratedType(ETK_None, *SS, T);
}
}
} else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
(void)DiagnoseUseOfDecl(IDecl, NameLoc);
if (!HasTrailingDot)
T = Context.getObjCInterfaceType(IDecl);
}
if (T.isNull()) {
// If it's not plausibly a type, suppress diagnostics.
Result.suppressDiagnostics();
return ParsedType();
}
return ParsedType::make(T);
}
/// isTagName() - This method is called *for error recovery purposes only*
/// to determine if the specified name is a valid tag name ("struct foo"). If
/// so, this returns the TST for the tag corresponding to it (TST_enum,
/// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose
/// cases in C where the user forgot to specify the tag.
DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
// Do a tag name lookup in this scope.
LookupResult R(*this, &II, SourceLocation(), LookupTagName);
LookupName(R, S, false);
R.suppressDiagnostics();
if (R.getResultKind() == LookupResult::Found)
if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
switch (TD->getTagKind()) {
case TTK_Struct: return DeclSpec::TST_struct;
case TTK_Interface: return DeclSpec::TST_interface;
case TTK_Union: return DeclSpec::TST_union;
case TTK_Class: return DeclSpec::TST_class;
case TTK_Enum: return DeclSpec::TST_enum;
}
}
return DeclSpec::TST_unspecified;
}
/// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
/// if a CXXScopeSpec's type is equal to the type of one of the base classes
/// then downgrade the missing typename error to a warning.
/// This is needed for MSVC compatibility; Example:
/// @code
/// template<class T> class A {
/// public:
/// typedef int TYPE;
/// };
/// template<class T> class B : public A<T> {
/// public:
/// A<T>::TYPE a; // no typename required because A<T> is a base class.
/// };
/// @endcode
bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
if (CurContext->isRecord()) {
const Type *Ty = SS->getScopeRep()->getAsType();
CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base)
if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType()))
return true;
return S->isFunctionPrototypeScope();
}
return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
}
bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
SourceLocation IILoc,
Scope *S,
CXXScopeSpec *SS,
ParsedType &SuggestedType) {
// We don't have anything to suggest (yet).
SuggestedType = ParsedType();
// There may have been a typo in the name of the type. Look up typo
// results, in case we have something that we can suggest.
TypeNameValidatorCCC Validator(false);
if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc),
LookupOrdinaryName, S, SS,
Validator)) {
std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
if (Corrected.isKeyword()) {
// We corrected to a keyword.
IdentifierInfo *NewII = Corrected.getCorrectionAsIdentifierInfo();
if (!isSimpleTypeSpecifier(NewII->getTokenID()))
CorrectedQuotedStr = "the keyword " + CorrectedQuotedStr;
Diag(IILoc, diag::err_unknown_typename_suggest)
<< II << CorrectedQuotedStr
<< FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
II = NewII;
} else {
NamedDecl *Result = Corrected.getCorrectionDecl();
// We found a similarly-named type or interface; suggest that.
if (!SS || !SS->isSet())
Diag(IILoc, diag::err_unknown_typename_suggest)
<< II << CorrectedQuotedStr
<< FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
else if (DeclContext *DC = computeDeclContext(*SS, false))
Diag(IILoc, diag::err_unknown_nested_typename_suggest)
<< II << DC << CorrectedQuotedStr << SS->getRange()
<< FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
else
llvm_unreachable("could not have corrected a typo here");
Diag(Result->getLocation(), diag::note_previous_decl)
<< CorrectedQuotedStr;
SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS,
false, false, ParsedType(),
/*IsCtorOrDtorName=*/false,
/*NonTrivialTypeSourceInfo=*/true);
}
return true;
}
if (getLangOpts().CPlusPlus) {
// See if II is a class template that the user forgot to pass arguments to.
UnqualifiedId Name;
Name.setIdentifier(II, IILoc);
CXXScopeSpec EmptySS;
TemplateTy TemplateResult;
bool MemberOfUnknownSpecialization;
if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
Name, ParsedType(), true, TemplateResult,
MemberOfUnknownSpecialization) == TNK_Type_template) {
TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
Diag(IILoc, diag::err_template_missing_args) << TplName;
if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
Diag(TplDecl->getLocation(), diag::note_template_decl_here)
<< TplDecl->getTemplateParameters()->getSourceRange();
}
return true;
}
}
// FIXME: Should we move the logic that tries to recover from a missing tag
// (struct, union, enum) from Parser::ParseImplicitInt here, instead?
if (!SS || (!SS->isSet() && !SS->isInvalid()))
Diag(IILoc, diag::err_unknown_typename) << II;
else if (DeclContext *DC = computeDeclContext(*SS, false))
Diag(IILoc, diag::err_typename_nested_not_found)
<< II << DC << SS->getRange();
else if (isDependentScopeSpecifier(*SS)) {
unsigned DiagID = diag::err_typename_missing;
if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S))
DiagID = diag::warn_typename_missing;
Diag(SS->getRange().getBegin(), DiagID)
<< (NestedNameSpecifier *)SS->getScopeRep() << II->getName()
<< SourceRange(SS->getRange().getBegin(), IILoc)
<< FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
SuggestedType = ActOnTypenameType(S, SourceLocation(),
*SS, *II, IILoc).get();
} else {
assert(SS && SS->isInvalid() &&
"Invalid scope specifier has already been diagnosed");
}
return true;
}
/// \brief Determine whether the given result set contains either a type name
/// or
static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus &&
NextToken.is(tok::less);
for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
return true;
if (CheckTemplate && isa<TemplateDecl>(*I))
return true;
}
return false;
}
static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result,
Scope *S, CXXScopeSpec &SS,
IdentifierInfo *&Name,
SourceLocation NameLoc) {
LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName);
SemaRef.LookupParsedName(R, S, &SS);
if (TagDecl *Tag = R.getAsSingle<TagDecl>()) {
const char *TagName = 0;
const char *FixItTagName = 0;
switch (Tag->getTagKind()) {
case TTK_Class:
TagName = "class";
FixItTagName = "class ";
break;
case TTK_Enum:
TagName = "enum";
FixItTagName = "enum ";
break;
case TTK_Struct:
TagName = "struct";
FixItTagName = "struct ";
break;
case TTK_Interface:
TagName = "__interface";
FixItTagName = "__interface ";
break;
case TTK_Union:
TagName = "union";
FixItTagName = "union ";
break;
}
SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
<< Name << TagName << SemaRef.getLangOpts().CPlusPlus
<< FixItHint::CreateInsertion(NameLoc, FixItTagName);
for (LookupResult::iterator I = Result.begin(), IEnd = Result.end();
I != IEnd; ++I)
SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
<< Name << TagName;
// Replace lookup results with just the tag decl.
Result.clear(Sema::LookupTagName);
SemaRef.LookupParsedName(Result, S, &SS);
return true;
}
return false;
}
/// Build a ParsedType for a simple-type-specifier with a nested-name-specifier.
static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS,
QualType T, SourceLocation NameLoc) {
ASTContext &Context = S.Context;
TypeLocBuilder Builder;
Builder.pushTypeSpec(T).setNameLoc(NameLoc);
T = S.getElaboratedType(ETK_None, SS, T);
ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
ElabTL.setElaboratedKeywordLoc(SourceLocation());
ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
}
Sema::NameClassification Sema::ClassifyName(Scope *S,
CXXScopeSpec &SS,
IdentifierInfo *&Name,
SourceLocation NameLoc,
const Token &NextToken,
bool IsAddressOfOperand,
CorrectionCandidateCallback *CCC) {
DeclarationNameInfo NameInfo(Name, NameLoc);
ObjCMethodDecl *CurMethod = getCurMethodDecl();
if (NextToken.is(tok::coloncolon)) {
BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(),
QualType(), false, SS, 0, false);
}
LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
LookupParsedName(Result, S, &SS, !CurMethod);
// Perform lookup for Objective-C instance variables (including automatically
// synthesized instance variables), if we're in an Objective-C method.
// FIXME: This lookup really, really needs to be folded in to the normal
// unqualified lookup mechanism.
if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
ExprResult E = LookupInObjCMethod(Result, S, Name, true);
if (E.get() || E.isInvalid())
return E;
}
bool SecondTry = false;
bool IsFilteredTemplateName = false;
Corrected:
switch (Result.getResultKind()) {
case LookupResult::NotFound:
// If an unqualified-id is followed by a '(', then we have a function
// call.
if (!SS.isSet() && NextToken.is(tok::l_paren)) {
// In C++, this is an ADL-only call.
// FIXME: Reference?
if (getLangOpts().CPlusPlus)
return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
// C90 6.3.2.2:
// If the expression that precedes the parenthesized argument list in a
// function call consists solely of an identifier, and if no
// declaration is visible for this identifier, the identifier is
// implicitly declared exactly as if, in the innermost block containing
// the function call, the declaration
//
// extern int identifier ();
//
// appeared.
//
// We also allow this in C99 as an extension.
if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
Result.addDecl(D);
Result.resolveKind();
return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
}
}
// In C, we first see whether there is a tag type by the same name, in
// which case it's likely that the user just forget to write "enum",
// "struct", or "union".
if (!getLangOpts().CPlusPlus && !SecondTry &&
isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
break;
}
// Perform typo correction to determine if there is another name that is
// close to this name.
if (!SecondTry && CCC) {
SecondTry = true;
if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
Result.getLookupKind(), S,
&SS, *CCC)) {
unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
unsigned QualifiedDiag = diag::err_no_member_suggest;
std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
NamedDecl *FirstDecl = Corrected.getCorrectionDecl();
NamedDecl *UnderlyingFirstDecl
= FirstDecl? FirstDecl->getUnderlyingDecl() : 0;
if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
UnqualifiedDiag = diag::err_no_template_suggest;
QualifiedDiag = diag::err_no_member_template_suggest;
} else if (UnderlyingFirstDecl &&
(isa<TypeDecl>(UnderlyingFirstDecl) ||
isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
UnqualifiedDiag = diag::err_unknown_typename_suggest;
QualifiedDiag = diag::err_unknown_nested_typename_suggest;
}
if (SS.isEmpty())
Diag(NameLoc, UnqualifiedDiag)
<< Name << CorrectedQuotedStr
<< FixItHint::CreateReplacement(NameLoc, CorrectedStr);
else
Diag(NameLoc, QualifiedDiag)
<< Name << computeDeclContext(SS, false) << CorrectedQuotedStr
<< SS.getRange()
<< FixItHint::CreateReplacement(NameLoc, CorrectedStr);
// Update the name, so that the caller has the new name.
Name = Corrected.getCorrectionAsIdentifierInfo();
// Typo correction corrected to a keyword.
if (Corrected.isKeyword())
return Corrected.getCorrectionAsIdentifierInfo();
// Also update the LookupResult...
// FIXME: This should probably go away at some point
Result.clear();
Result.setLookupName(Corrected.getCorrection());
if (FirstDecl) {
Result.addDecl(FirstDecl);
Diag(FirstDecl->getLocation(), diag::note_previous_decl)
<< CorrectedQuotedStr;
}
// If we found an Objective-C instance variable, let
// LookupInObjCMethod build the appropriate expression to
// reference the ivar.
// FIXME: This is a gross hack.
if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
Result.clear();
ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
return E;
}
goto Corrected;
}
}
// We failed to correct; just fall through and let the parser deal with it.
Result.suppressDiagnostics();
return NameClassification::Unknown();
case LookupResult::NotFoundInCurrentInstantiation: {
// We performed name lookup into the current instantiation, and there were
// dependent bases, so we treat this result the same way as any other
// dependent nested-name-specifier.
// C++ [temp.res]p2:
// A name used in a template declaration or definition and that is
// dependent on a template-parameter is assumed not to name a type
// unless the applicable name lookup finds a type name or the name is
// qualified by the keyword typename.
//
// FIXME: If the next token is '<', we might want to ask the parser to
// perform some heroics to see if we actually have a
// template-argument-list, which would indicate a missing 'template'
// keyword here.
return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(),
NameInfo, IsAddressOfOperand,
/*TemplateArgs=*/0);
}
case LookupResult::Found:
case LookupResult::FoundOverloaded:
case LookupResult::FoundUnresolvedValue:
break;
case LookupResult::Ambiguous:
if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
hasAnyAcceptableTemplateNames(Result)) {
// C++ [temp.local]p3:
// A lookup that finds an injected-class-name (10.2) can result in an
// ambiguity in certain cases (for example, if it is found in more than
// one base class). If all of the injected-class-names that are found
// refer to specializations of the same class template, and if the name
// is followed by a template-argument-list, the reference refers to the
// class template itself and not a specialization thereof, and is not
// ambiguous.
//
// This filtering can make an ambiguous result into an unambiguous one,
// so try again after filtering out template names.
FilterAcceptableTemplateNames(Result);
if (!Result.isAmbiguous()) {
IsFilteredTemplateName = true;
break;
}
}
// Diagnose the ambiguity and return an error.
return NameClassification::Error();
}
if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
(IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
// C++ [temp.names]p3:
// After name lookup (3.4) finds that a name is a template-name or that
// an operator-function-id or a literal- operator-id refers to a set of
// overloaded functions any member of which is a function template if
// this is followed by a <, the < is always taken as the delimiter of a
// template-argument-list and never as the less-than operator.
if (!IsFilteredTemplateName)
FilterAcceptableTemplateNames(Result);
if (!Result.empty()) {
bool IsFunctionTemplate;
TemplateName Template;
if (Result.end() - Result.begin() > 1) {
IsFunctionTemplate = true;
Template = Context.getOverloadedTemplateName(Result.begin(),
Result.end());
} else {
TemplateDecl *TD
= cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
if (SS.isSet() && !SS.isInvalid())
Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
/*TemplateKeyword=*/false,
TD);
else
Template = TemplateName(TD);
}
if (IsFunctionTemplate) {
// Function templates always go through overload resolution, at which
// point we'll perform the various checks (e.g., accessibility) we need
// to based on which function we selected.
Result.suppressDiagnostics();
return NameClassification::FunctionTemplate(Template);
}
return NameClassification::TypeTemplate(Template);
}
}
NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
DiagnoseUseOfDecl(Type, NameLoc);
QualType T = Context.getTypeDeclType(Type);
if (SS.isNotEmpty())
return buildNestedType(*this, SS, T, NameLoc);
return ParsedType::make(T);
}
ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
if (!Class) {
// FIXME: It's unfortunate that we don't have a Type node for handling this.
if (ObjCCompatibleAliasDecl *Alias
= dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
Class = Alias->getClassInterface();
}
if (Class) {
DiagnoseUseOfDecl(Class, NameLoc);
if (NextToken.is(tok::period)) {
// Interface. <something> is parsed as a property reference expression.
// Just return "unknown" as a fall-through for now.
Result.suppressDiagnostics();
return NameClassification::Unknown();
}
QualType T = Context.getObjCInterfaceType(Class);
return ParsedType::make(T);
}
// We can have a type template here if we're classifying a template argument.
if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl))
return NameClassification::TypeTemplate(
TemplateName(cast<TemplateDecl>(FirstDecl)));
// Check for a tag type hidden by a non-type decl in a few cases where it
// seems likely a type is wanted instead of the non-type that was found.
if (!getLangOpts().ObjC1) {
bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star);
if ((NextToken.is(tok::identifier) ||
(NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) &&
isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
TypeDecl *Type = Result.getAsSingle<TypeDecl>();
DiagnoseUseOfDecl(Type, NameLoc);
QualType T = Context.getTypeDeclType(Type);
if (SS.isNotEmpty())
return buildNestedType(*this, SS, T, NameLoc);
return ParsedType::make(T);
}
}
if (FirstDecl->isCXXClassMember())
return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0);
bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
return BuildDeclarationNameExpr(SS, Result, ADL);
}
// Determines the context to return to after temporarily entering a
// context. This depends in an unnecessarily complicated way on the
// exact ordering of callbacks from the parser.
DeclContext *Sema::getContainingDC(DeclContext *DC) {
// Functions defined inline within classes aren't parsed until we've
// finished parsing the top-level class, so the top-level class is
// the context we'll need to return to.
if (isa<FunctionDecl>(DC)) {
DC = DC->getLexicalParent();
// A function not defined within a class will always return to its
// lexical context.
if (!isa<CXXRecordDecl>(DC))
return DC;
// A C++ inline method/friend is parsed *after* the topmost class
// it was declared in is fully parsed ("complete"); the topmost
// class is the context we need to return to.
while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
DC = RD;
// Return the declaration context of the topmost class the inline method is
// declared in.
return DC;
}
return DC->getLexicalParent();
}
void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
assert(getContainingDC(DC) == CurContext &&
"The next DeclContext should be lexically contained in the current one.");
CurContext = DC;
S->setEntity(DC);
}
void Sema::PopDeclContext() {
assert(CurContext && "DeclContext imbalance!");
CurContext = getContainingDC(CurContext);
assert(CurContext && "Popped translation unit!");
}
/// EnterDeclaratorContext - Used when we must lookup names in the context
/// of a declarator's nested name specifier.
///
void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
// C++0x [basic.lookup.unqual]p13:
// A name used in the definition of a static data member of class
// X (after the qualified-id of the static member) is looked up as
// if the name was used in a member function of X.
// C++0x [basic.lookup.unqual]p14:
// If a variable member of a namespace is defined outside of the
// scope of its namespace then any name used in the definition of
// the variable member (after the declarator-id) is looked up as
// if the definition of the variable member occurred in its
// namespace.
// Both of these imply that we should push a scope whose context
// is the semantic context of the declaration. We can't use
// PushDeclContext here because that context is not necessarily
// lexically contained in the current context. Fortunately,
// the containing scope should have the appropriate information.
assert(!S->getEntity() && "scope already has entity");
#ifndef NDEBUG
Scope *Ancestor = S->getParent();
while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
#endif
CurContext = DC;
S->setEntity(DC);
}
void Sema::ExitDeclaratorContext(Scope *S) {
assert(S->getEntity() == CurContext && "Context imbalance!");
// Switch back to the lexical context. The safety of this is
// enforced by an assert in EnterDeclaratorContext.
Scope *Ancestor = S->getParent();
while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
CurContext = (DeclContext*) Ancestor->getEntity();
// We don't need to do anything with the scope, which is going to
// disappear.
}
void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) {
// We assume that the caller has already called
// ActOnReenterTemplateScope
FD = TFD->getTemplatedDecl();
}
if (!FD)
return;
// Same implementation as PushDeclContext, but enters the context
// from the lexical parent, rather than the top-level class.
assert(CurContext == FD->getLexicalParent() &&
"The next DeclContext should be lexically contained in the current one.");
CurContext = FD;
S->setEntity(CurContext);
for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
ParmVarDecl *Param = FD->getParamDecl(P);
// If the parameter has an identifier, then add it to the scope
if (Param->getIdentifier()) {
S->AddDecl(Param);
IdResolver.AddDecl(Param);
}
}
}
void Sema::ActOnExitFunctionContext() {
// Same implementation as PopDeclContext, but returns to the lexical parent,
// rather than the top-level class.
assert(CurContext && "DeclContext imbalance!");
CurContext = CurContext->getLexicalParent();
assert(CurContext && "Popped translation unit!");
}
/// \brief Determine whether we allow overloading of the function
/// PrevDecl with another declaration.
///
/// This routine determines whether overloading is possible, not
/// whether some new function is actually an overload. It will return
/// true in C++ (where we can always provide overloads) or, as an
/// extension, in C when the previous function is already an
/// overloaded function declaration or has the "overloadable"
/// attribute.
static bool AllowOverloadingOfFunction(LookupResult &Previous,
ASTContext &Context) {
if (Context.getLangOpts().CPlusPlus)
return true;
if (Previous.getResultKind() == LookupResult::FoundOverloaded)
return true;
return (Previous.getResultKind() == LookupResult::Found
&& Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
}
/// Add this decl to the scope shadowed decl chains.
void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
// Move up the scope chain until we find the nearest enclosing
// non-transparent context. The declaration will be introduced into this
// scope.
while (S->getEntity() &&
((DeclContext *)S->getEntity())->isTransparentContext())
S = S->getParent();
// Add scoped declarations into their context, so that they can be
// found later. Declarations without a context won't be inserted
// into any context.
if (AddToContext)
CurContext->addDecl(D);
// Out-of-line definitions shouldn't be pushed into scope in C++.
// Out-of-line variable and function definitions shouldn't even in C.
if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
D->isOutOfLine() &&
!D->getDeclContext()->getRedeclContext()->Equals(
D->getLexicalDeclContext()->getRedeclContext()))
return;
// Template instantiations should also not be pushed into scope.
if (isa<FunctionDecl>(D) &&
cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
return;
// If this replaces anything in the current scope,
IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
IEnd = IdResolver.end();
for (; I != IEnd; ++I) {
if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
S->RemoveDecl(*I);
IdResolver.RemoveDecl(*I);
// Should only need to replace one decl.
break;
}
}
S->AddDecl(D);
if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
// Implicitly-generated labels may end up getting generated in an order that
// isn't strictly lexical, which breaks name lookup. Be careful to insert
// the label at the appropriate place in the identifier chain.
for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
if (IDC == CurContext) {
if (!S->isDeclScope(*I))
continue;
} else if (IDC->Encloses(CurContext))
break;
}
IdResolver.InsertDeclAfter(I, D);
} else {
IdResolver.AddDecl(D);
}
}
void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) {
if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope)
TUScope->AddDecl(D);
}
bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S,
bool ExplicitInstantiationOrSpecialization) {
return IdResolver.isDeclInScope(D, Ctx, Context, S,
ExplicitInstantiationOrSpecialization);
}
Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
DeclContext *TargetDC = DC->getPrimaryContext();
do {
if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
if (ScopeDC->getPrimaryContext() == TargetDC)
return S;
} while ((S = S->getParent()));
return 0;
}
static bool isOutOfScopePreviousDeclaration(NamedDecl *,
DeclContext*,
ASTContext&);
/// Filters out lookup results that don't fall within the given scope
/// as determined by isDeclInScope.
void Sema::FilterLookupForScope(LookupResult &R,
DeclContext *Ctx, Scope *S,
bool ConsiderLinkage,
bool ExplicitInstantiationOrSpecialization) {
LookupResult::Filter F = R.makeFilter();
while (F.hasNext()) {
NamedDecl *D = F.next();
if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization))
continue;
if (ConsiderLinkage &&
isOutOfScopePreviousDeclaration(D, Ctx, Context))
continue;
F.erase();
}
F.done();
}
static bool isUsingDecl(NamedDecl *D) {
return isa<UsingShadowDecl>(D) ||
isa<UnresolvedUsingTypenameDecl>(D) ||
isa<UnresolvedUsingValueDecl>(D);
}
/// Removes using shadow declarations from the lookup results.
static void RemoveUsingDecls(LookupResult &R) {
LookupResult::Filter F = R.makeFilter();
while (F.hasNext())
if (isUsingDecl(F.next()))
F.erase();
F.done();
}
/// \brief Check for this common pattern:
/// @code
/// class S {
/// S(const S&); // DO NOT IMPLEMENT
/// void operator=(const S&); // DO NOT IMPLEMENT
/// };
/// @endcode
static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
// FIXME: Should check for private access too but access is set after we get
// the decl here.
if (D->doesThisDeclarationHaveABody())
return false;
if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
return CD->isCopyConstructor();
if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
return Method->isCopyAssignmentOperator();
return false;
}
bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
assert(D);
if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
return false;
// Ignore class templates.
if (D->getDeclContext()->isDependentContext() ||
D->getLexicalDeclContext()->isDependentContext())
return false;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
return false;
if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
return false;
} else {
// 'static inline' functions are used in headers; don't warn.
if (FD->getStorageClass() == SC_Static &&
FD->isInlineSpecified())
return false;
}
if (FD->doesThisDeclarationHaveABody() &&
Context.DeclMustBeEmitted(FD))
return false;
} else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
if (!VD->isFileVarDecl() ||
VD->getType().isConstant(Context) ||
Context.DeclMustBeEmitted(VD))
return false;
if (VD->isStaticDataMember() &&
VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
return false;
} else {
return false;
}
// Only warn for unused decls internal to the translation unit.
if (D->getLinkage() == ExternalLinkage)
return false;
return true;
}
void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
if (!D)
return;
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
const FunctionDecl *First = FD->getFirstDeclaration();
if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
return; // First should already be in the vector.
}
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
const VarDecl *First = VD->getFirstDeclaration();
if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
return; // First should already be in the vector.
}
if (ShouldWarnIfUnusedFileScopedDecl(D))
UnusedFileScopedDecls.push_back(D);
}
static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
if (D->isInvalidDecl())
return false;
if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>())
return false;
if (isa<LabelDecl>(D))
return true;
// White-list anything that isn't a local variable.
if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
!D->getDeclContext()->isFunctionOrMethod())
return false;
// Types of valid local variables should be complete, so this should succeed.
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
// White-list anything with an __attribute__((unused)) type.
QualType Ty = VD->getType();
// Only look at the outermost level of typedef.
if (const TypedefType *TT = Ty->getAs<TypedefType>()) {
if (TT->getDecl()->hasAttr<UnusedAttr>())
return false;
}
// If we failed to complete the type for some reason, or if the type is
// dependent, don't diagnose the variable.
if (Ty->isIncompleteType() || Ty->isDependentType())
return false;
if (const TagType *TT = Ty->getAs<TagType>()) {
const TagDecl *Tag = TT->getDecl();
if (Tag->hasAttr<UnusedAttr>())
return false;
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
if (!RD->hasTrivialDestructor())
return false;
if (const Expr *Init = VD->getInit()) {
const CXXConstructExpr *Construct =
dyn_cast<CXXConstructExpr>(Init);
if (Construct && !Construct->isElidable()) {
CXXConstructorDecl *CD = Construct->getConstructor();
if (!CD->isTrivial())
return false;
}
}
}
}
// TODO: __attribute__((unused)) templates?
}
return true;
}
static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
FixItHint &Hint) {
if (isa<LabelDecl>(D)) {
SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true);
if (AfterColon.isInvalid())
return;
Hint = FixItHint::CreateRemoval(CharSourceRange::
getCharRange(D->getLocStart(), AfterColon));
}
return;
}
/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
/// unless they are marked attr(unused).
void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
FixItHint Hint;
if (!ShouldDiagnoseUnusedDecl(D))
return;
GenerateFixForUnusedDecl(D, Context, Hint);
unsigned DiagID;
if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
DiagID = diag::warn_unused_exception_param;
else if (isa<LabelDecl>(D))
DiagID = diag::warn_unused_label;
else
DiagID = diag::warn_unused_variable;
Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
}
static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
// Verify that we have no forward references left. If so, there was a goto
// or address of a label taken, but no definition of it. Label fwd
// definitions are indicated with a null substmt.
if (L->getStmt() == 0)
S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
}
void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
if (S->decl_empty()) return;
assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
"Scope shouldn't contain decls!");
for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
I != E; ++I) {
Decl *TmpD = (*I);
assert(TmpD && "This decl didn't get pushed??");
assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
NamedDecl *D = cast<NamedDecl>(TmpD);
if (!D->getDeclName()) continue;
// Diagnose unused variables in this scope.
if (!S->hasErrorOccurred())
DiagnoseUnusedDecl(D);
// If this was a forward reference to a label, verify it was defined.
if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
CheckPoppedLabel(LD, *this);
// Remove this name from our lexical scope.
IdResolver.RemoveDecl(D);
}
}
void Sema::ActOnStartFunctionDeclarator() {
++InFunctionDeclarator;
}
void Sema::ActOnEndFunctionDeclarator() {
assert(InFunctionDeclarator);
--InFunctionDeclarator;
}
/// \brief Look for an Objective-C class in the translation unit.
///
/// \param Id The name of the Objective-C class we're looking for. If
/// typo-correction fixes this name, the Id will be updated
/// to the fixed name.
///
/// \param IdLoc The location of the name in the translation unit.
///
/// \param DoTypoCorrection If true, this routine will attempt typo correction
/// if there is no class with the given name.
///
/// \returns The declaration of the named Objective-C class, or NULL if the
/// class could not be found.
ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
SourceLocation IdLoc,
bool DoTypoCorrection) {
// The third "scope" argument is 0 since we aren't enabling lazy built-in
// creation from this context.
NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
if (!IDecl && DoTypoCorrection) {
// Perform typo correction at the given location, but only if we
// find an Objective-C class name.
DeclFilterCCC<ObjCInterfaceDecl> Validator;
if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc),
LookupOrdinaryName, TUScope, NULL,
Validator)) {
IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>();
Diag(IdLoc, diag::err_undef_interface_suggest)
<< Id << IDecl->getDeclName()
<< FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
Diag(IDecl->getLocation(), diag::note_previous_decl)
<< IDecl->getDeclName();
Id = IDecl->getIdentifier();
}
}
ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
// This routine must always return a class definition, if any.
if (Def && Def->getDefinition())
Def = Def->getDefinition();
return Def;
}
/// getNonFieldDeclScope - Retrieves the innermost scope, starting
/// from S, where a non-field would be declared. This routine copes
/// with the difference between C and C++ scoping rules in structs and
/// unions. For example, the following code is well-formed in C but
/// ill-formed in C++:
/// @code
/// struct S6 {
/// enum { BAR } e;
/// };
///
/// void test_S6() {
/// struct S6 a;
/// a.e = BAR;
/// }
/// @endcode
/// For the declaration of BAR, this routine will return a different
/// scope. The scope S will be the scope of the unnamed enumeration
/// within S6. In C++, this routine will return the scope associated
/// with S6, because the enumeration's scope is a transparent
/// context but structures can contain non-field names. In C, this
/// routine will return the translation unit scope, since the
/// enumeration's scope is a transparent context and structures cannot
/// contain non-field names.
Scope *Sema::getNonFieldDeclScope(Scope *S) {
while (((S->getFlags() & Scope::DeclScope) == 0) ||
(S->getEntity() &&
((DeclContext *)S->getEntity())->isTransparentContext()) ||
(S->isClassScope() && !getLangOpts().CPlusPlus))
S = S->getParent();
return S;
}
/// LazilyCreateBuiltin - The specified Builtin-ID was first used at
/// file scope. lazily create a decl for it. ForRedeclaration is true
/// if we're creating this built-in in anticipation of redeclaring the
/// built-in.
NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
Scope *S, bool ForRedeclaration,
SourceLocation Loc) {
Builtin::ID BID = (Builtin::ID)bid;
ASTContext::GetBuiltinTypeError Error;
QualType R = Context.GetBuiltinType(BID, Error);
switch (Error) {
case ASTContext::GE_None:
// Okay
break;
case ASTContext::GE_Missing_stdio:
if (ForRedeclaration)
Diag(Loc, diag::warn_implicit_decl_requires_stdio)
<< Context.BuiltinInfo.GetName(BID);
return 0;
case ASTContext::GE_Missing_setjmp:
if (ForRedeclaration)
Diag(Loc, diag::warn_implicit_decl_requires_setjmp)
<< Context.BuiltinInfo.GetName(BID);
return 0;
case ASTContext::GE_Missing_ucontext:
if (ForRedeclaration)
Diag(Loc, diag::warn_implicit_decl_requires_ucontext)
<< Context.BuiltinInfo.GetName(BID);
return 0;
}
if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
Diag(Loc, diag::ext_implicit_lib_function_decl)
<< Context.BuiltinInfo.GetName(BID)
<< R;
if (Context.BuiltinInfo.getHeaderName(BID) &&
Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc)
!= DiagnosticsEngine::Ignored)
Diag(Loc, diag::note_please_include_header)
<< Context.BuiltinInfo.getHeaderName(BID)
<< Context.BuiltinInfo.GetName(BID);
}
FunctionDecl *New = FunctionDecl::Create(Context,
Context.getTranslationUnitDecl(),
Loc, Loc, II, R, /*TInfo=*/0,
SC_Extern,
SC_None, false,
/*hasPrototype=*/true);
New->setImplicit();
// Create Decl objects for each parameter, adding them to the
// FunctionDecl.
if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
SmallVector<ParmVarDecl*, 16> Params;
for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
ParmVarDecl *parm =
ParmVarDecl::Create(Context, New, SourceLocation(),
SourceLocation(), 0,
FT->getArgType(i), /*TInfo=*/0,
SC_None, SC_None, 0);
parm->setScopeInfo(0, i);
Params.push_back(parm);
}
New->setParams(Params);
}
AddKnownFunctionAttributes(New);
// TUScope is the translation-unit scope to insert this function into.
// FIXME: This is hideous. We need to teach PushOnScopeChains to
// relate Scopes to DeclContexts, and probably eliminate CurContext
// entirely, but we're not there yet.
DeclContext *SavedContext = CurContext;
CurContext = Context.getTranslationUnitDecl();
PushOnScopeChains(New, TUScope);
CurContext = SavedContext;
return New;
}
bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
QualType OldType;
if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
OldType = OldTypedef->getUnderlyingType();
else
OldType = Context.getTypeDeclType(Old);
QualType NewType = New->getUnderlyingType();
if (NewType->isVariablyModifiedType()) {
// Must not redefine a typedef with a variably-modified type.
int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef)
<< Kind << NewType;
if (Old->getLocation().isValid())
Diag(Old->getLocation(), diag::note_previous_definition);
New->setInvalidDecl();
return true;
}
if (OldType != NewType &&
!OldType->isDependentType() &&
!NewType->isDependentType() &&
!Context.hasSameType(OldType, NewType)) {
int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
Diag(New->getLocation(), diag::err_redefinition_different_typedef)
<< Kind << NewType << OldType;
if (Old->getLocation().isValid())
Diag(Old->getLocation(), diag::note_previous_definition);
New->setInvalidDecl();
return true;
}
return false;
}
/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
/// same name and scope as a previous declaration 'Old'. Figure out
/// how to resolve this situation, merging decls or emitting
/// diagnostics as appropriate. If there was an error, set New to be invalid.
///
void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) {
// If the new decl is known invalid already, don't bother doing any
// merging checks.
if (New->isInvalidDecl()) return;
// Allow multiple definitions for ObjC built-in typedefs.
// FIXME: Verify the underlying types are equivalent!
if (getLangOpts().ObjC1) {
const IdentifierInfo *TypeID = New->getIdentifier();
switch (TypeID->getLength()) {
default: break;
case 2:
{
if (!TypeID->isStr("id"))
break;
QualType T = New->getUnderlyingType();
if (!T->isPointerType())
break;
if (!T->isVoidPointerType()) {
QualType PT = T->getAs<PointerType>()->getPointeeType();
if (!PT->isStructureType())
break;
}
Context.setObjCIdRedefinitionType(T);
// Install the built-in type for 'id', ignoring the current definition.
New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
return;
}
case 5:
if (!TypeID->isStr("Class"))
break;
Context.setObjCClassRedefinitionType(New->getUnderlyingType());
// Install the built-in type for 'Class', ignoring the current definition.
New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
return;
case 3:
if (!TypeID->isStr("SEL"))
break;
Context.setObjCSelRedefinitionType(New->getUnderlyingType());
// Install the built-in type for 'SEL', ignoring the current definition.
New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
return;
}
// Fall through - the typedef name was not a builtin type.
}
// Verify the old decl was also a type.
TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
if (!Old) {
Diag(New->getLocation(), diag::err_redefinition_different_kind)
<< New->getDeclName();
NamedDecl *OldD = OldDecls.getRepresentativeDecl();
if (OldD->getLocation().isValid())
Diag(OldD->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// If the old declaration is invalid, just give up here.
if (Old->isInvalidDecl())
return New->setInvalidDecl();
// If the typedef types are not identical, reject them in all languages and
// with any extensions enabled.
if (isIncompatibleTypedef(Old, New))
return;
// The types match. Link up the redeclaration chain if the old
// declaration was a typedef.
if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old))
New->setPreviousDeclaration(Typedef);
if (getLangOpts().MicrosoftExt)
return;
if (getLangOpts().CPlusPlus) {
// C++ [dcl.typedef]p2:
// In a given non-class scope, a typedef specifier can be used to
// redefine the name of any type declared in that scope to refer
// to the type to which it already refers.
if (!isa<CXXRecordDecl>(CurContext))
return;
// C++0x [dcl.typedef]p4:
// In a given class scope, a typedef specifier can be used to redefine
// any class-name declared in that scope that is not also a typedef-name
// to refer to the type to which it already refers.
//
// This wording came in via DR424, which was a correction to the
// wording in DR56, which accidentally banned code like:
//
// struct S {
// typedef struct A { } A;
// };
//
// in the C++03 standard. We implement the C++0x semantics, which
// allow the above but disallow
//
// struct S {
// typedef int I;
// typedef int I;
// };
//
// since that was the intent of DR56.
if (!isa<TypedefNameDecl>(Old))
return;
Diag(New->getLocation(), diag::err_redefinition)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// Modules always permit redefinition of typedefs, as does C11.
if (getLangOpts().Modules || getLangOpts().C11)
return;
// If we have a redefinition of a typedef in C, emit a warning. This warning
// is normally mapped to an error, but can be controlled with
// -Wtypedef-redefinition. If either the original or the redefinition is
// in a system header, don't emit this for compatibility with GCC.
if (getDiagnostics().getSuppressSystemWarnings() &&
(Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
Context.getSourceManager().isInSystemHeader(New->getLocation())))
return;
Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
<< New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return;
}
/// DeclhasAttr - returns true if decl Declaration already has the target
/// attribute.
static bool
DeclHasAttr(const Decl *D, const Attr *A) {
// There can be multiple AvailabilityAttr in a Decl. Make sure we copy
// all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is
// responsible for making sure they are consistent.
const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A);
if (AA)
return false;
const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
if ((*i)->getKind() == A->getKind()) {
if (Ann) {
if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation())
return true;
continue;
}
// FIXME: Don't hardcode this check
if (OA && isa<OwnershipAttr>(*i))
return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
return true;
}
return false;
}
bool Sema::mergeDeclAttribute(Decl *D, InheritableAttr *Attr) {
InheritableAttr *NewAttr = NULL;
if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr))
NewAttr = mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(),
AA->getIntroduced(), AA->getDeprecated(),
AA->getObsoleted(), AA->getUnavailable(),
AA->getMessage());
else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr))
NewAttr = mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility());
else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr))
NewAttr = mergeDLLImportAttr(D, ImportA->getRange());
else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr))
NewAttr = mergeDLLExportAttr(D, ExportA->getRange());
else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr))
NewAttr = mergeFormatAttr(D, FA->getRange(), FA->getType(),
FA->getFormatIdx(), FA->getFirstArg());
else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr))
NewAttr = mergeSectionAttr(D, SA->getRange(), SA->getName());
else if (!DeclHasAttr(D, Attr))
NewAttr = cast<InheritableAttr>(Attr->clone(Context));
if (NewAttr) {
NewAttr->setInherited(true);
D->addAttr(NewAttr);
return true;
}
return false;
}
static const Decl *getDefinition(const Decl *D) {
if (const TagDecl *TD = dyn_cast<TagDecl>(D))
return TD->getDefinition();
if (const VarDecl *VD = dyn_cast<VarDecl>(D))
return VD->getDefinition();
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
const FunctionDecl* Def;
if (FD->hasBody(Def))
return Def;
}
return NULL;
}
static bool hasAttribute(const Decl *D, attr::Kind Kind) {
for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end();
I != E; ++I) {
Attr *Attribute = *I;
if (Attribute->getKind() == Kind)
return true;
}
return false;
}
/// checkNewAttributesAfterDef - If we already have a definition, check that
/// there are no new attributes in this declaration.
static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) {
if (!New->hasAttrs())
return;
const Decl *Def = getDefinition(Old);
if (!Def || Def == New)
return;
AttrVec &NewAttributes = New->getAttrs();
for (unsigned I = 0, E = NewAttributes.size(); I != E;) {
const Attr *NewAttribute = NewAttributes[I];
if (hasAttribute(Def, NewAttribute->getKind())) {
++I;
continue; // regular attr merging will take care of validating this.
}
S.Diag(NewAttribute->getLocation(),
diag::warn_attribute_precede_definition);
S.Diag(Def->getLocation(), diag::note_previous_definition);
NewAttributes.erase(NewAttributes.begin() + I);
--E;
}
}
/// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
void Sema::mergeDeclAttributes(Decl *New, Decl *Old,
bool MergeDeprecation) {
// attributes declared post-definition are currently ignored
checkNewAttributesAfterDef(*this, New, Old);
if (!Old->hasAttrs())
return;
bool foundAny = New->hasAttrs();
// Ensure that any moving of objects within the allocated map is done before
// we process them.
if (!foundAny) New->setAttrs(AttrVec());
for (specific_attr_iterator<InheritableAttr>
i = Old->specific_attr_begin<InheritableAttr>(),
e = Old->specific_attr_end<InheritableAttr>();
i != e; ++i) {
// Ignore deprecated/unavailable/availability attributes if requested.
if (!MergeDeprecation &&
(isa<DeprecatedAttr>(*i) ||
isa<UnavailableAttr>(*i) ||
isa<AvailabilityAttr>(*i)))
continue;
if (mergeDeclAttribute(New, *i))
foundAny = true;
}
if (!foundAny) New->dropAttrs();
}
/// mergeParamDeclAttributes - Copy attributes from the old parameter
/// to the new one.
static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
const ParmVarDecl *oldDecl,
ASTContext &C) {
if (!oldDecl->hasAttrs())
return;
bool foundAny = newDecl->hasAttrs();
// Ensure that any moving of objects within the allocated map is
// done before we process them.
if (!foundAny) newDecl->setAttrs(AttrVec());
for (specific_attr_iterator<InheritableParamAttr>
i = oldDecl->specific_attr_begin<InheritableParamAttr>(),
e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) {
if (!DeclHasAttr(newDecl, *i)) {
InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C));
newAttr->setInherited(true);
newDecl->addAttr(newAttr);
foundAny = true;
}
}
if (!foundAny) newDecl->dropAttrs();
}
namespace {
/// Used in MergeFunctionDecl to keep track of function parameters in
/// C.
struct GNUCompatibleParamWarning {
ParmVarDecl *OldParm;
ParmVarDecl *NewParm;
QualType PromotedType;
};
}
/// getSpecialMember - get the special member enum for a method.
Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
if (Ctor->isDefaultConstructor())
return Sema::CXXDefaultConstructor;
if (Ctor->isCopyConstructor())
return Sema::CXXCopyConstructor;
if (Ctor->isMoveConstructor())
return Sema::CXXMoveConstructor;
} else if (isa<CXXDestructorDecl>(MD)) {
return Sema::CXXDestructor;
} else if (MD->isCopyAssignmentOperator()) {
return Sema::CXXCopyAssignment;
} else if (MD->isMoveAssignmentOperator()) {
return Sema::CXXMoveAssignment;
}
return Sema::CXXInvalid;
}
/// canRedefineFunction - checks if a function can be redefined. Currently,
/// only extern inline functions can be redefined, and even then only in
/// GNU89 mode.
static bool canRedefineFunction(const FunctionDecl *FD,
const LangOptions& LangOpts) {
return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
!LangOpts.CPlusPlus &&
FD->isInlineSpecified() &&
FD->getStorageClass() == SC_Extern);
}
/// Is the given calling convention the ABI default for the given
/// declaration?
static bool isABIDefaultCC(Sema &S, CallingConv CC, FunctionDecl *D) {
CallingConv ABIDefaultCC;
if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
ABIDefaultCC = S.Context.getDefaultCXXMethodCallConv(D->isVariadic());
} else {
// Free C function or a static method.
ABIDefaultCC = (S.Context.getLangOpts().MRTD ? CC_X86StdCall : CC_C);
}
return ABIDefaultCC == CC;
}
/// MergeFunctionDecl - We just parsed a function 'New' from
/// declarator D which has the same name and scope as a previous
/// declaration 'Old'. Figure out how to resolve this situation,
/// merging decls or emitting diagnostics as appropriate.
///
/// In C++, New and Old must be declarations that are not
/// overloaded. Use IsOverload to determine whether New and Old are
/// overloaded, and to select the Old declaration that New should be
/// merged with.
///
/// Returns true if there was an error, false otherwise.
bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) {
// Verify the old decl was also a function.
FunctionDecl *Old = 0;
if (FunctionTemplateDecl *OldFunctionTemplate
= dyn_cast<FunctionTemplateDecl>(OldD))
Old = OldFunctionTemplate->getTemplatedDecl();
else
Old = dyn_cast<FunctionDecl>(OldD);
if (!Old) {
if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
Diag(Shadow->getTargetDecl()->getLocation(),
diag::note_using_decl_target);
Diag(Shadow->getUsingDecl()->getLocation(),
diag::note_using_decl) << 0;
return true;
}
Diag(New->getLocation(), diag::err_redefinition_different_kind)
<< New->getDeclName();
Diag(OldD->getLocation(), diag::note_previous_definition);
return true;
}
// Determine whether the previous declaration was a definition,
// implicit declaration, or a declaration.
diag::kind PrevDiag;
if (Old->isThisDeclarationADefinition())
PrevDiag = diag::note_previous_definition;
else if (Old->isImplicit())
PrevDiag = diag::note_previous_implicit_declaration;
else
PrevDiag = diag::note_previous_declaration;
QualType OldQType = Context.getCanonicalType(Old->getType());
QualType NewQType = Context.getCanonicalType(New->getType());
// Don't complain about this if we're in GNU89 mode and the old function
// is an extern inline function.
if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
New->getStorageClass() == SC_Static &&
Old->getStorageClass() != SC_Static &&
!canRedefineFunction(Old, getLangOpts())) {
if (getLangOpts().MicrosoftExt) {
Diag(New->getLocation(), diag::warn_static_non_static) << New;
Diag(Old->getLocation(), PrevDiag);
} else {
Diag(New->getLocation(), diag::err_static_non_static) << New;
Diag(Old->getLocation(), PrevDiag);
return true;
}
}
// If a function is first declared with a calling convention, but is
// later declared or defined without one, the second decl assumes the
// calling convention of the first.
//
// It's OK if a function is first declared without a calling convention,
// but is later declared or defined with the default calling convention.
//
// For the new decl, we have to look at the NON-canonical type to tell the
// difference between a function that really doesn't have a calling
// convention and one that is declared cdecl. That's because in
// canonicalization (see ASTContext.cpp), cdecl is canonicalized away
// because it is the default calling convention.
//
// Note also that we DO NOT return at this point, because we still have
// other tests to run.
const FunctionType *OldType = cast<FunctionType>(OldQType);
const FunctionType *NewType = New->getType()->getAs<FunctionType>();
FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
bool RequiresAdjustment = false;
if (OldTypeInfo.getCC() == NewTypeInfo.getCC()) {
// Fast path: nothing to do.
// Inherit the CC from the previous declaration if it was specified
// there but not here.
} else if (NewTypeInfo.getCC() == CC_Default) {
NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
RequiresAdjustment = true;
// Don't complain about mismatches when the default CC is
// effectively the same as the explict one.
} else if (OldTypeInfo.getCC() == CC_Default &&
isABIDefaultCC(*this, NewTypeInfo.getCC(), New)) {
NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
RequiresAdjustment = true;
} else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
NewTypeInfo.getCC())) {
// Calling conventions really aren't compatible, so complain.
Diag(New->getLocation(), diag::err_cconv_change)
<< FunctionType::getNameForCallConv(NewTypeInfo.getCC())
<< (OldTypeInfo.getCC() == CC_Default)
<< (OldTypeInfo.getCC() == CC_Default ? "" :
FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
Diag(Old->getLocation(), diag::note_previous_declaration);
return true;
}
// FIXME: diagnose the other way around?
if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
NewTypeInfo = NewTypeInfo.withNoReturn(true);
RequiresAdjustment = true;
}
// Merge regparm attribute.
if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
if (NewTypeInfo.getHasRegParm()) {
Diag(New->getLocation(), diag::err_regparm_mismatch)
<< NewType->getRegParmType()
<< OldType->getRegParmType();
Diag(Old->getLocation(), diag::note_previous_declaration);
return true;
}
NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
RequiresAdjustment = true;
}
// Merge ns_returns_retained attribute.
if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
if (NewTypeInfo.getProducesResult()) {
Diag(New->getLocation(), diag::err_returns_retained_mismatch);
Diag(Old->getLocation(), diag::note_previous_declaration);
return true;
}
NewTypeInfo = NewTypeInfo.withProducesResult(true);
RequiresAdjustment = true;
}
if (RequiresAdjustment) {
NewType = Context.adjustFunctionType(NewType, NewTypeInfo);
New->setType(QualType(NewType, 0));
NewQType = Context.getCanonicalType(New->getType());
}
if (getLangOpts().CPlusPlus) {
// (C++98 13.1p2):
// Certain function declarations cannot be overloaded:
// -- Function declarations that differ only in the return type
// cannot be overloaded.
QualType OldReturnType = OldType->getResultType();
QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType();
QualType ResQT;
if (OldReturnType != NewReturnType) {
if (NewReturnType->isObjCObjectPointerType()
&& OldReturnType->isObjCObjectPointerType())
ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
if (ResQT.isNull()) {
if (New->isCXXClassMember() && New->isOutOfLine())
Diag(New->getLocation(),
diag::err_member_def_does_not_match_ret_type) << New;
else
Diag(New->getLocation(), diag::err_ovl_diff_return_type);
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
return true;
}
else
NewQType = ResQT;
}
const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
if (OldMethod && NewMethod) {
// Preserve triviality.
NewMethod->setTrivial(OldMethod->isTrivial());
// MSVC allows explicit template specialization at class scope:
// 2 CXMethodDecls referring to the same function will be injected.
// We don't want a redeclartion error.
bool IsClassScopeExplicitSpecialization =
OldMethod->isFunctionTemplateSpecialization() &&
NewMethod->isFunctionTemplateSpecialization();
bool isFriend = NewMethod->getFriendObjectKind();
if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
!IsClassScopeExplicitSpecialization) {
// -- Member function declarations with the same name and the
// same parameter types cannot be overloaded if any of them
// is a static member function declaration.
if (OldMethod->isStatic() || NewMethod->isStatic()) {
Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
return true;
}
// C++ [class.mem]p1:
// [...] A member shall not be declared twice in the
// member-specification, except that a nested class or member
// class template can be declared and then later defined.
if (ActiveTemplateInstantiations.empty()) {
unsigned NewDiag;
if (isa<CXXConstructorDecl>(OldMethod))
NewDiag = diag::err_constructor_redeclared;
else if (isa<CXXDestructorDecl>(NewMethod))
NewDiag = diag::err_destructor_redeclared;
else if (isa<CXXConversionDecl>(NewMethod))
NewDiag = diag::err_conv_function_redeclared;
else
NewDiag = diag::err_member_redeclared;
Diag(New->getLocation(), NewDiag);
} else {
Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation)
<< New << New->getType();
}
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
// Complain if this is an explicit declaration of a special
// member that was initially declared implicitly.
//
// As an exception, it's okay to befriend such methods in order
// to permit the implicit constructor/destructor/operator calls.
} else if (OldMethod->isImplicit()) {
if (isFriend) {
NewMethod->setImplicit();
} else {
Diag(NewMethod->getLocation(),
diag::err_definition_of_implicitly_declared_member)
<< New << getSpecialMember(OldMethod);
return true;
}
} else if (OldMethod->isExplicitlyDefaulted() && !isFriend) {
Diag(NewMethod->getLocation(),
diag::err_definition_of_explicitly_defaulted_member)
<< getSpecialMember(OldMethod);
return true;
}
}
// (C++98 8.3.5p3):
// All declarations for a function shall agree exactly in both the
// return type and the parameter-type-list.
// We also want to respect all the extended bits except noreturn.
// noreturn should now match unless the old type info didn't have it.
QualType OldQTypeForComparison = OldQType;
if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
assert(OldQType == QualType(OldType, 0));
const FunctionType *OldTypeForComparison
= Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
OldQTypeForComparison = QualType(OldTypeForComparison, 0);
assert(OldQTypeForComparison.isCanonical());
}
if (OldQTypeForComparison == NewQType)
return MergeCompatibleFunctionDecls(New, Old, S);
// Fall through for conflicting redeclarations and redefinitions.
}
// C: Function types need to be compatible, not identical. This handles
// duplicate function decls like "void f(int); void f(enum X);" properly.
if (!getLangOpts().CPlusPlus &&
Context.typesAreCompatible(OldQType, NewQType)) {
const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
const FunctionProtoType *OldProto = 0;
if (isa<FunctionNoProtoType>(NewFuncType) &&
(OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
// The old declaration provided a function prototype, but the
// new declaration does not. Merge in the prototype.
assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
OldProto->arg_type_end());
NewQType = Context.getFunctionType(NewFuncType->getResultType(),
ParamTypes.data(), ParamTypes.size(),
OldProto->getExtProtoInfo());
New->setType(NewQType);
New->setHasInheritedPrototype();
// Synthesize a parameter for each argument type.
SmallVector<ParmVarDecl*, 16> Params;
for (FunctionProtoType::arg_type_iterator
ParamType = OldProto->arg_type_begin(),
ParamEnd = OldProto->arg_type_end();
ParamType != ParamEnd; ++ParamType) {
ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
SourceLocation(),
SourceLocation(), 0,
*ParamType, /*TInfo=*/0,
SC_None, SC_None,
0);
Param->setScopeInfo(0, Params.size());
Param->setImplicit();
Params.push_back(Param);
}
New->setParams(Params);
}
return MergeCompatibleFunctionDecls(New, Old, S);
}
// GNU C permits a K&R definition to follow a prototype declaration
// if the declared types of the parameters in the K&R definition
// match the types in the prototype declaration, even when the
// promoted types of the parameters from the K&R definition differ
// from the types in the prototype. GCC then keeps the types from
// the prototype.
//
// If a variadic prototype is followed by a non-variadic K&R definition,
// the K&R definition becomes variadic. This is sort of an edge case, but
// it's legal per the standard depending on how you read C99 6.7.5.3p15 and
// C99 6.9.1p8.
if (!getLangOpts().CPlusPlus &&
Old->hasPrototype() && !New->hasPrototype() &&
New->getType()->getAs<FunctionProtoType>() &&
Old->getNumParams() == New->getNumParams()) {
SmallVector<QualType, 16> ArgTypes;
SmallVector<GNUCompatibleParamWarning, 16> Warnings;
const FunctionProtoType *OldProto
= Old->getType()->getAs<FunctionProtoType>();
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
// Determine whether this is the GNU C extension.
QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
NewProto->getResultType());
bool LooseCompatible = !MergedReturn.isNull();
for (unsigned Idx = 0, End = Old->getNumParams();
LooseCompatible && Idx != End; ++Idx) {
ParmVarDecl *OldParm = Old->getParamDecl(Idx);
ParmVarDecl *NewParm = New->getParamDecl(Idx);
if (Context.typesAreCompatible(OldParm->getType(),
NewProto->getArgType(Idx))) {
ArgTypes.push_back(NewParm->getType());
} else if (Context.typesAreCompatible(OldParm->getType(),
NewParm->getType(),
/*CompareUnqualified=*/true)) {
GNUCompatibleParamWarning Warn
= { OldParm, NewParm, NewProto->getArgType(Idx) };
Warnings.push_back(Warn);
ArgTypes.push_back(NewParm->getType());
} else
LooseCompatible = false;
}
if (LooseCompatible) {
for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
Diag(Warnings[Warn].NewParm->getLocation(),
diag::ext_param_promoted_not_compatible_with_prototype)
<< Warnings[Warn].PromotedType
<< Warnings[Warn].OldParm->getType();
if (Warnings[Warn].OldParm->getLocation().isValid())
Diag(Warnings[Warn].OldParm->getLocation(),
diag::note_previous_declaration);
}
New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
ArgTypes.size(),
OldProto->getExtProtoInfo()));
return MergeCompatibleFunctionDecls(New, Old, S);
}
// Fall through to diagnose conflicting types.
}
// A function that has already been declared has been redeclared or defined
// with a different type- show appropriate diagnostic
if (unsigned BuiltinID = Old->getBuiltinID()) {
// The user has declared a builtin function with an incompatible
// signature.
if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
// The function the user is redeclaring is a library-defined
// function like 'malloc' or 'printf'. Warn about the
// redeclaration, then pretend that we don't know about this
// library built-in.
Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
<< Old << Old->getType();
New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
Old->setInvalidDecl();
return false;
}
PrevDiag = diag::note_previous_builtin_declaration;
}
Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
return true;
}
/// \brief Completes the merge of two function declarations that are
/// known to be compatible.
///
/// This routine handles the merging of attributes and other
/// properties of function declarations form the old declaration to
/// the new declaration, once we know that New is in fact a
/// redeclaration of Old.
///
/// \returns false
bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
Scope *S) {
// Merge the attributes
mergeDeclAttributes(New, Old);
// Merge the storage class.
if (Old->getStorageClass() != SC_Extern &&
Old->getStorageClass() != SC_None)
New->setStorageClass(Old->getStorageClass());
// Merge "pure" flag.
if (Old->isPure())
New->setPure();
// Merge attributes from the parameters. These can mismatch with K&R
// declarations.
if (New->getNumParams() == Old->getNumParams())
for (unsigned i = 0, e = New->getNumParams(); i != e; ++i)
mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i),
Context);
if (getLangOpts().CPlusPlus)
return MergeCXXFunctionDecl(New, Old, S);
return false;
}
void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
ObjCMethodDecl *oldMethod) {
// Merge the attributes, including deprecated/unavailable
mergeDeclAttributes(newMethod, oldMethod, /* mergeDeprecation */true);
// Merge attributes from the parameters.
ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(),
oe = oldMethod->param_end();
for (ObjCMethodDecl::param_iterator
ni = newMethod->param_begin(), ne = newMethod->param_end();
ni != ne && oi != oe; ++ni, ++oi)
mergeParamDeclAttributes(*ni, *oi, Context);
CheckObjCMethodOverride(newMethod, oldMethod, true);
}
/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
/// scope as a previous declaration 'Old'. Figure out how to merge their types,
/// emitting diagnostics as appropriate.
///
/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
/// to here in AddInitializerToDecl. We can't check them before the initializer
/// is attached.
void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) {
if (New->isInvalidDecl() || Old->isInvalidDecl())
return;
QualType MergedT;
if (getLangOpts().CPlusPlus) {
AutoType *AT = New->getType()->getContainedAutoType();
if (AT && !AT->isDeduced()) {
// We don't know what the new type is until the initializer is attached.
return;
} else if (Context.hasSameType(New->getType(), Old->getType())) {
// These could still be something that needs exception specs checked.
return MergeVarDeclExceptionSpecs(New, Old);
}
// C++ [basic.link]p10:
// [...] the types specified by all declarations referring to a given
// object or function shall be identical, except that declarations for an
// array object can specify array types that differ by the presence or
// absence of a major array bound (8.3.4).
else if (Old->getType()->isIncompleteArrayType() &&
New->getType()->isArrayType()) {
CanQual<ArrayType> OldArray
= Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
CanQual<ArrayType> NewArray
= Context.getCanonicalType(New->getType())->getAs<ArrayType>();
if (OldArray->getElementType() == NewArray->getElementType())
MergedT = New->getType();
} else if (Old->getType()->isArrayType() &&
New->getType()->isIncompleteArrayType()) {
CanQual<ArrayType> OldArray
= Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
CanQual<ArrayType> NewArray
= Context.getCanonicalType(New->getType())->getAs<ArrayType>();
if (OldArray->getElementType() == NewArray->getElementType())
MergedT = Old->getType();
} else if (New->getType()->isObjCObjectPointerType()
&& Old->getType()->isObjCObjectPointerType()) {
MergedT = Context.mergeObjCGCQualifiers(New->getType(),
Old->getType());
}
} else {
MergedT = Context.mergeTypes(New->getType(), Old->getType());
}
if (MergedT.isNull()) {
Diag(New->getLocation(), diag::err_redefinition_different_type)
<< New->getDeclName() << New->getType() << Old->getType();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
New->setType(MergedT);
}
/// MergeVarDecl - We just parsed a variable 'New' which has the same name
/// and scope as a previous declaration 'Old'. Figure out how to resolve this
/// situation, merging decls or emitting diagnostics as appropriate.
///
/// Tentative definition rules (C99 6.9.2p2) are checked by
/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
/// definitions here, since the initializer hasn't been attached.
///
void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
// If the new decl is already invalid, don't do any other checking.
if (New->isInvalidDecl())
return;
// Verify the old decl was also a variable.
VarDecl *Old = 0;
if (!Previous.isSingleResult() ||
!(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
Diag(New->getLocation(), diag::err_redefinition_different_kind)
<< New->getDeclName();
Diag(Previous.getRepresentativeDecl()->getLocation(),
diag::note_previous_definition);
return New->setInvalidDecl();
}
// C++ [class.mem]p1:
// A member shall not be declared twice in the member-specification [...]
//
// Here, we need only consider static data members.
if (Old->isStaticDataMember() && !New->isOutOfLine()) {
Diag(New->getLocation(), diag::err_duplicate_member)
<< New->getIdentifier();
Diag(Old->getLocation(), diag::note_previous_declaration);
New->setInvalidDecl();
}
mergeDeclAttributes(New, Old);
// Warn if an already-declared variable is made a weak_import in a subsequent
// declaration
if (New->getAttr<WeakImportAttr>() &&
Old->getStorageClass() == SC_None &&
!Old->getAttr<WeakImportAttr>()) {
Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
// Remove weak_import attribute on new declaration.
New->dropAttr<WeakImportAttr>();
}
// Merge the types.
MergeVarDeclTypes(New, Old);
if (New->isInvalidDecl())
return;
// C99 6.2.2p4: Check if we have a static decl followed by a non-static.
if (New->getStorageClass() == SC_Static &&
(Old->getStorageClass() == SC_None || Old->hasExternalStorage())) {
Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// C99 6.2.2p4:
// For an identifier declared with the storage-class specifier
// extern in a scope in which a prior declaration of that
// identifier is visible,23) if the prior declaration specifies
// internal or external linkage, the linkage of the identifier at
// the later declaration is the same as the linkage specified at
// the prior declaration. If no prior declaration is visible, or
// if the prior declaration specifies no linkage, then the
// identifier has external linkage.
if (New->hasExternalStorage() && Old->hasLinkage())
/* Okay */;
else if (New->getStorageClass() != SC_Static &&
Old->getStorageClass() == SC_Static) {
Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// Check if extern is followed by non-extern and vice-versa.
if (New->hasExternalStorage() &&
!Old->hasLinkage() && Old->isLocalVarDecl()) {
Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
if (Old->hasExternalStorage() &&
!New->hasLinkage() && New->isLocalVarDecl()) {
Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
// Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
// FIXME: The test for external storage here seems wrong? We still
// need to check for mismatches.
if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
// Don't complain about out-of-line definitions of static members.
!(Old->getLexicalDeclContext()->isRecord() &&
!New->getLexicalDeclContext()->isRecord())) {
Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
return New->setInvalidDecl();
}
if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
} else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
Diag(Old->getLocation(), diag::note_previous_definition);
}
// C++ doesn't have tentative definitions, so go right ahead and check here.
const VarDecl *Def;
if (getLangOpts().CPlusPlus &&
New->isThisDeclarationADefinition() == VarDecl::Definition &&
(Def = Old->getDefinition())) {
Diag(New->getLocation(), diag::err_redefinition)
<< New->getDeclName();
Diag(Def->getLocation(), diag::note_previous_definition);
New->setInvalidDecl();
return;
}
// c99 6.2.2 P4.
// For an identifier declared with the storage-class specifier extern in a
// scope in which a prior declaration of that identifier is visible, if
// the prior declaration specifies internal or external linkage, the linkage
// of the identifier at the later declaration is the same as the linkage
// specified at the prior declaration.
// FIXME. revisit this code.
if (New->hasExternalStorage() &&
Old->getLinkage() == InternalLinkage &&
New->getDeclContext() == Old->getDeclContext())
New->setStorageClass(Old->getStorageClass());
// Keep a chain of previous declarations.
New->setPreviousDeclaration(Old);
// Inherit access appropriately.
New->setAccess(Old->getAccess());
}
/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
/// no declarator (e.g. "struct foo;") is parsed.
Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
DeclSpec &DS) {
return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg());
}
/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
/// no declarator (e.g. "struct foo;") is parsed. It also accopts template
/// parameters to cope with template friend declarations.
Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
DeclSpec &DS,
MultiTemplateParamsArg TemplateParams) {
Decl *TagD = 0;
TagDecl *Tag = 0;
if (DS.getTypeSpecType() == DeclSpec::TST_class ||
DS.getTypeSpecType() == DeclSpec::TST_struct ||
DS.getTypeSpecType() == DeclSpec::TST_interface ||
DS.getTypeSpecType() == DeclSpec::TST_union ||
DS.getTypeSpecType() == DeclSpec::TST_enum) {
TagD = DS.getRepAsDecl();
if (!TagD) // We probably had an error
return 0;
// Note that the above type specs guarantee that the
// type rep is a Decl, whereas in many of the others
// it's a Type.
if (isa<TagDecl>(TagD))
Tag = cast<TagDecl>(TagD);
else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD))
Tag = CTD->getTemplatedDecl();
}
if (Tag) {
Tag->setFreeStanding();
if (Tag->isInvalidDecl())
return Tag;
}
if (unsigned TypeQuals = DS.getTypeQualifiers()) {
// Enforce C99 6.7.3p2: "Types other than pointer types derived from object
// or incomplete types shall not be restrict-qualified."
if (TypeQuals & DeclSpec::TQ_restrict)
Diag(DS.getRestrictSpecLoc(),
diag::err_typecheck_invalid_restrict_not_pointer_noarg)
<< DS.getSourceRange();
}
if (DS.isConstexprSpecified()) {
// C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
// and definitions of functions and variables.
if (Tag)
Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
<< (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 :
DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4);
else
Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
// Don't emit warnings after this error.
return TagD;
}
if (DS.isFriendSpecified()) {
// If we're dealing with a decl but not a TagDecl, assume that
// whatever routines created it handled the friendship aspect.
if (TagD && !Tag)
return 0;
return ActOnFriendTypeDecl(S, DS, TemplateParams);
}
// Track whether we warned about the fact that there aren't any
// declarators.
bool emittedWarning = false;
if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
if (!Record->getDeclName() && Record->isCompleteDefinition() &&
DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
if (getLangOpts().CPlusPlus ||
Record->getDeclContext()->isRecord())
return BuildAnonymousStructOrUnion(S, DS, AS, Record);
Diag(DS.getLocStart(), diag::ext_no_declarators)
<< DS.getSourceRange();
emittedWarning = true;
}
}
// Check for Microsoft C extension: anonymous struct.
if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus &&
CurContext->isRecord() &&
DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
// Handle 2 kinds of anonymous struct:
// struct STRUCT;
// and
// STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag);
if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) ||
(DS.getTypeSpecType() == DeclSpec::TST_typename &&
DS.getRepAsType().get()->isStructureType())) {
Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct)
<< DS.getSourceRange();
return BuildMicrosoftCAnonymousStruct(S, DS, Record);
}
}
if (getLangOpts().CPlusPlus &&
DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
if (Enum->enumerator_begin() == Enum->enumerator_end() &&
!Enum->getIdentifier() && !Enum->isInvalidDecl()) {
Diag(Enum->getLocation(), diag::ext_no_declarators)
<< DS.getSourceRange();
emittedWarning = true;
}
// Skip all the checks below if we have a type error.
if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD;
if (!DS.isMissingDeclaratorOk()) {
// Warn about typedefs of enums without names, since this is an
// extension in both Microsoft and GNU.
if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
Tag && isa<EnumDecl>(Tag)) {
Diag(DS.getLocStart(), diag::ext_typedef_without_a_name)
<< DS.getSourceRange();
return Tag;
}
Diag(DS.getLocStart(), diag::ext_no_declarators)
<< DS.getSourceRange();
emittedWarning = true;
}
// We're going to complain about a bunch of spurious specifiers;
// only do this if we're declaring a tag, because otherwise we
// should be getting diag::ext_no_declarators.
if (emittedWarning || (TagD && TagD->isInvalidDecl()))
return TagD;
// Note that a linkage-specification sets a storage class, but
// 'extern "C" struct foo;' is actually valid and not theoretically
// useless.
if (DeclSpec::SCS scs = DS.getStorageClassSpec())
if (!DS.isExternInLinkageSpec())
Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier)
<< DeclSpec::getSpecifierName(scs);
if (DS.isThreadSpecified())
Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread";
if (DS.getTypeQualifiers()) {
if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const";
if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile";
// Restrict is covered above.
}
if (DS.isInlineSpecified())
Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline";
if (DS.isVirtualSpecified())
Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual";
if (DS.isExplicitSpecified())
Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit";
if (DS.isModulePrivateSpecified() &&
Tag && Tag->getDeclContext()->isFunctionOrMethod())
Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
<< Tag->getTagKind()
<< FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
// Warn about ignored type attributes, for example:
// __attribute__((aligned)) struct A;
// Attributes should be placed after tag to apply to type declaration.
if (!DS.getAttributes().empty()) {
DeclSpec::TST TypeSpecType = DS.getTypeSpecType();
if (TypeSpecType == DeclSpec::TST_class ||
TypeSpecType == DeclSpec::TST_struct ||
TypeSpecType == DeclSpec::TST_interface ||
TypeSpecType == DeclSpec::TST_union ||
TypeSpecType == DeclSpec::TST_enum) {
AttributeList* attrs = DS.getAttributes().getList();
while (attrs) {
Diag(attrs->getScopeLoc(),
diag::warn_declspec_attribute_ignored)
<< attrs->getName()
<< (TypeSpecType == DeclSpec::TST_class ? 0 :
TypeSpecType == DeclSpec::TST_struct ? 1 :
TypeSpecType == DeclSpec::TST_union ? 2 :
TypeSpecType == DeclSpec::TST_interface ? 3 : 4);
attrs = attrs->getNext();
}
}
}
ActOnDocumentableDecl(TagD);
return TagD;
}
/// We are trying to inject an anonymous member into the given scope;
/// check if there's an existing declaration that can't be overloaded.
///
/// \return true if this is a forbidden redeclaration
static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
Scope *S,
DeclContext *Owner,
DeclarationName Name,
SourceLocation NameLoc,
unsigned diagnostic) {
LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
Sema::ForRedeclaration);
if (!SemaRef.LookupName(R, S)) return false;
if (R.getAsSingle<TagDecl>())
return false;
// Pick a representative declaration.
NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
assert(PrevDecl && "Expected a non-null Decl");
if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
return false;
SemaRef.Diag(NameLoc, diagnostic) << Name;
SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
return true;
}
/// InjectAnonymousStructOrUnionMembers - Inject the members of the
/// anonymous struct or union AnonRecord into the owning context Owner
/// and scope S. This routine will be invoked just after we realize
/// that an unnamed union or struct is actually an anonymous union or
/// struct, e.g.,
///
/// @code
/// union {
/// int i;
/// float f;
/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
/// // f into the surrounding scope.x
/// @endcode
///
/// This routine is recursive, injecting the names of nested anonymous
/// structs/unions into the owning context and scope as well.
static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
DeclContext *Owner,
RecordDecl *AnonRecord,
AccessSpecifier AS,
SmallVector<NamedDecl*, 2> &Chaining,
bool MSAnonStruct) {
unsigned diagKind
= AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
: diag::err_anonymous_struct_member_redecl;
bool Invalid = false;
// Look every FieldDecl and IndirectFieldDecl with a name.
for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(),
DEnd = AnonRecord->decls_end();
D != DEnd; ++D) {
if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) &&
cast<NamedDecl>(*D)->getDeclName()) {
ValueDecl *VD = cast<ValueDecl>(*D);
if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
VD->getLocation(), diagKind)) {
// C++ [class.union]p2:
// The names of the members of an anonymous union shall be
// distinct from the names of any other entity in the
// scope in which the anonymous union is declared.
Invalid = true;
} else {
// C++ [class.union]p2:
// For the purpose of name lookup, after the anonymous union
// definition, the members of the anonymous union are
// considered to have been defined in the scope in which the
// anonymous union is declared.
unsigned OldChainingSize = Chaining.size();
if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(),
PE = IF->chain_end(); PI != PE; ++PI)
Chaining.push_back(*PI);
else
Chaining.push_back(VD);
assert(Chaining.size() >= 2);
NamedDecl **NamedChain =
new (SemaRef.Context)NamedDecl*[Chaining.size()];
for (unsigned i = 0; i < Chaining.size(); i++)
NamedChain[i] = Chaining[i];
IndirectFieldDecl* IndirectField =
IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(),
VD->getIdentifier(), VD->getType(),
NamedChain, Chaining.size());
IndirectField->setAccess(AS);
IndirectField->setImplicit();
SemaRef.PushOnScopeChains(IndirectField, S);
// That includes picking up the appropriate access specifier.
if (AS != AS_none) IndirectField->setAccess(AS);
Chaining.resize(OldChainingSize);
}
}
}
return Invalid;
}
/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
/// a VarDecl::StorageClass. Any error reporting is up to the caller:
/// illegal input values are mapped to SC_None.
static StorageClass
StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
switch (StorageClassSpec) {
case DeclSpec::SCS_unspecified: return SC_None;
case DeclSpec::SCS_extern: return SC_Extern;
case DeclSpec::SCS_static: return SC_Static;
case DeclSpec::SCS_auto: return SC_Auto;
case DeclSpec::SCS_register: return SC_Register;
case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
// Illegal SCSs map to None: error reporting is up to the caller.
case DeclSpec::SCS_mutable: // Fall through.
case DeclSpec::SCS_typedef: return SC_None;
}
llvm_unreachable("unknown storage class specifier");
}
/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
/// a StorageClass. Any error reporting is up to the caller:
/// illegal input values are mapped to SC_None.
static StorageClass
StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
switch (StorageClassSpec) {
case DeclSpec::SCS_unspecified: return SC_None;
case DeclSpec::SCS_extern: return SC_Extern;
case DeclSpec::SCS_static: return SC_Static;
case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
// Illegal SCSs map to None: error reporting is up to the caller.
case DeclSpec::SCS_auto: // Fall through.
case DeclSpec::SCS_mutable: // Fall through.
case DeclSpec::SCS_register: // Fall through.
case DeclSpec::SCS_typedef: return SC_None;
}
llvm_unreachable("unknown storage class specifier");
}
/// BuildAnonymousStructOrUnion - Handle the declaration of an
/// anonymous structure or union. Anonymous unions are a C++ feature
/// (C++ [class.union]) and a C11 feature; anonymous structures
/// are a C11 feature and GNU C++ extension.
Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
AccessSpecifier AS,
RecordDecl *Record) {
DeclContext *Owner = Record->getDeclContext();
// Diagnose whether this anonymous struct/union is an extension.
if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11)
Diag(Record->getLocation(), diag::ext_anonymous_union);
else if (!Record->isUnion() && getLangOpts().CPlusPlus)
Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct);
else if (!Record->isUnion() && !getLangOpts().C11)
Diag(Record->getLocation(), diag::ext_c11_anonymous_struct);
// C and C++ require different kinds of checks for anonymous
// structs/unions.
bool Invalid = false;
if (getLangOpts().CPlusPlus) {
const char* PrevSpec = 0;
unsigned DiagID;
if (Record->isUnion()) {
// C++ [class.union]p6:
// Anonymous unions declared in a named namespace or in the
// global namespace shall be declared static.
if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
(isa<TranslationUnitDecl>(Owner) ||
(isa<NamespaceDecl>(Owner) &&
cast<NamespaceDecl>(Owner)->getDeclName()))) {
Diag(Record->getLocation(), diag::err_anonymous_union_not_static)
<< FixItHint::CreateInsertion(Record->getLocation(), "static ");
// Recover by adding 'static'.
DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
PrevSpec, DiagID);
}
// C++ [class.union]p6:
// A storage class is not allowed in a declaration of an
// anonymous union in a class scope.
else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
isa<RecordDecl>(Owner)) {
Diag(DS.getStorageClassSpecLoc(),
diag::err_anonymous_union_with_storage_spec)
<< FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
// Recover by removing the storage specifier.
DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified,
SourceLocation(),
PrevSpec, DiagID);
}
}
// Ignore const/volatile/restrict qualifiers.
if (DS.getTypeQualifiers()) {
if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
<< Record->isUnion() << 0
<< FixItHint::CreateRemoval(DS.getConstSpecLoc());
if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
Diag(DS.getVolatileSpecLoc(),
diag::ext_anonymous_struct_union_qualified)
<< Record->isUnion() << 1
<< FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
Diag(DS.getRestrictSpecLoc(),
diag::ext_anonymous_struct_union_qualified)
<< Record->isUnion() << 2
<< FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
DS.ClearTypeQualifiers();
}
// C++ [class.union]p2:
// The member-specification of an anonymous union shall only
// define non-static data members. [Note: nested types and
// functions cannot be declared within an anonymous union. ]
for (DeclContext::decl_iterator Mem = Record->decls_begin(),
MemEnd = Record->decls_end();
Mem != MemEnd; ++Mem) {
if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
// C++ [class.union]p3:
// An anonymous union shall not have private or protected
// members (clause 11).
assert(FD->getAccess() != AS_none);
if (FD->getAccess() != AS_public) {
Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
<< (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
Invalid = true;
}
// C++ [class.union]p1
// An object of a class with a non-trivial constructor, a non-trivial
// copy constructor, a non-trivial destructor, or a non-trivial copy
// assignment operator cannot be a member of a union, nor can an
// array of such objects.
if (CheckNontrivialField(FD))
Invalid = true;
} else if ((*Mem)->isImplicit()) {
// Any implicit members are fine.
} else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
// This is a type that showed up in an
// elaborated-type-specifier inside the anonymous struct or
// union, but which actually declares a type outside of the
// anonymous struct or union. It's okay.
} else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
if (!MemRecord->isAnonymousStructOrUnion() &&
MemRecord->getDeclName()) {
// Visual C++ allows type definition in anonymous struct or union.
if (getLangOpts().MicrosoftExt)
Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
<< (int)Record->isUnion();
else {
// This is a nested type declaration.
Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
<< (int)Record->isUnion();
Invalid = true;
}
}
} else if (isa<AccessSpecDecl>(*Mem)) {
// Any access specifier is fine.
} else {
// We have something that isn't a non-static data
// member. Complain about it.
unsigned DK = diag::err_anonymous_record_bad_member;
if (isa<TypeDecl>(*Mem))
DK = diag::err_anonymous_record_with_type;
else if (isa<FunctionDecl>(*Mem))
DK = diag::err_anonymous_record_with_function;
else if (isa<VarDecl>(*Mem))
DK = diag::err_anonymous_record_with_static;
// Visual C++ allows type definition in anonymous struct or union.
if (getLangOpts().MicrosoftExt &&
DK == diag::err_anonymous_record_with_type)
Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type)
<< (int)Record->isUnion();
else {
Diag((*Mem)->getLocation(), DK)
<< (int)Record->isUnion();
Invalid = true;
}
}
}
}
if (!Record->isUnion() && !Owner->isRecord()) {
Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
<< (int)getLangOpts().CPlusPlus;
Invalid = true;
}
// Mock up a declarator.
Declarator Dc(DS, Declarator::MemberContext);
TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
assert(TInfo && "couldn't build declarator info for anonymous struct/union");
// Create a declaration for this anonymous struct/union.
NamedDecl *Anon = 0;
if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
Anon = FieldDecl::Create(Context, OwningClass,
DS.getLocStart(),
Record->getLocation(),
/*IdentifierInfo=*/0,
Context.getTypeDeclType(Record),
TInfo,
/*BitWidth=*/0, /*Mutable=*/false,
/*InitStyle=*/ICIS_NoInit);
Anon->setAccess(AS);
if (getLangOpts().CPlusPlus)
FieldCollector->Add(cast<FieldDecl>(Anon));
} else {
DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
assert(SCSpec != DeclSpec::SCS_typedef &&
"Parser allowed 'typedef' as storage class VarDecl.");
VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
if (SCSpec == DeclSpec::SCS_mutable) {
// mutable can only appear on non-static class members, so it's always
// an error here
Diag(Record->getLocation(), diag::err_mutable_nonmember);
Invalid = true;
SC = SC_None;
}
SCSpec = DS.getStorageClassSpecAsWritten();
VarDecl::StorageClass SCAsWritten
= StorageClassSpecToVarDeclStorageClass(SCSpec);
Anon = VarDecl::Create(Context, Owner,
DS.getLocStart(),
Record->getLocation(), /*IdentifierInfo=*/0,
Context.getTypeDeclType(Record),
TInfo, SC, SCAsWritten);
// Default-initialize the implicit variable. This initialization will be
// trivial in almost all cases, except if a union member has an in-class
// initializer:
// union { int n = 0; };
ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
}
Anon->setImplicit();
// Add the anonymous struct/union object to the current
// context. We'll be referencing this object when we refer to one of
// its members.
Owner->addDecl(Anon);
// Inject the members of the anonymous struct/union into the owning
// context and into the identifier resolver chain for name lookup
// purposes.
SmallVector<NamedDecl*, 2> Chain;
Chain.push_back(Anon);
if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS,
Chain, false))
Invalid = true;
// Mark this as an anonymous struct/union type. Note that we do not
// do this until after we have already checked and injected the
// members of this anonymous struct/union type, because otherwise
// the members could be injected twice: once by DeclContext when it
// builds its lookup table, and once by
// InjectAnonymousStructOrUnionMembers.
Record->setAnonymousStructOrUnion(true);
if (Invalid)
Anon->setInvalidDecl();
return Anon;
}
/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
/// Microsoft C anonymous structure.
/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
/// Example:
///
/// struct A { int a; };
/// struct B { struct A; int b; };
///
/// void foo() {
/// B var;
/// var.a = 3;
/// }
///
Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
RecordDecl *Record) {
// If there is no Record, get the record via the typedef.
if (!Record)
Record = DS.getRepAsType().get()->getAsStructureType()->getDecl();
// Mock up a declarator.
Declarator Dc(DS, Declarator::TypeNameContext);
TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
assert(TInfo && "couldn't build declarator info for anonymous struct");
// Create a declaration for this anonymous struct.
NamedDecl* Anon = FieldDecl::Create(Context,
cast<RecordDecl>(CurContext),
DS.getLocStart(),
DS.getLocStart(),
/*IdentifierInfo=*/0,
Context.getTypeDeclType(Record),
TInfo,
/*BitWidth=*/0, /*Mutable=*/false,
/*InitStyle=*/ICIS_NoInit);
Anon->setImplicit();
// Add the anonymous struct object to the current context.
CurContext->addDecl(Anon);
// Inject the members of the anonymous struct into the current
// context and into the identifier resolver chain for name lookup
// purposes.
SmallVector<NamedDecl*, 2> Chain;
Chain.push_back(Anon);
RecordDecl *RecordDef = Record->getDefinition();
if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext,
RecordDef, AS_none,
Chain, true))
Anon->setInvalidDecl();
return Anon;
}
/// GetNameForDeclarator - Determine the full declaration name for the
/// given Declarator.
DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
return GetNameFromUnqualifiedId(D.getName());
}
/// \brief Retrieves the declaration name from a parsed unqualified-id.
DeclarationNameInfo
Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
DeclarationNameInfo NameInfo;
NameInfo.setLoc(Name.StartLocation);
switch (Name.getKind()) {
case UnqualifiedId::IK_ImplicitSelfParam:
case UnqualifiedId::IK_Identifier:
NameInfo.setName(Name.Identifier);
NameInfo.setLoc(Name.StartLocation);
return NameInfo;
case UnqualifiedId::IK_OperatorFunctionId:
NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
Name.OperatorFunctionId.Operator));
NameInfo.setLoc(Name.StartLocation);
NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
= Name.OperatorFunctionId.SymbolLocations[0];
NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
= Name.EndLocation.getRawEncoding();
return NameInfo;
case UnqualifiedId::IK_LiteralOperatorId:
NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
Name.Identifier));
NameInfo.setLoc(Name.StartLocation);
NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
return NameInfo;
case UnqualifiedId::IK_ConversionFunctionId: {
TypeSourceInfo *TInfo;
QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
if (Ty.isNull())
return DeclarationNameInfo();
NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
Context.getCanonicalType(Ty)));
NameInfo.setLoc(Name.StartLocation);
NameInfo.setNamedTypeInfo(TInfo);
return NameInfo;
}
case UnqualifiedId::IK_ConstructorName: {
TypeSourceInfo *TInfo;
QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
if (Ty.isNull())
return DeclarationNameInfo();
NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(Ty)));
NameInfo.setLoc(Name.StartLocation);
NameInfo.setNamedTypeInfo(TInfo);
return NameInfo;
}
case UnqualifiedId::IK_ConstructorTemplateId: {
// In well-formed code, we can only have a constructor
// template-id that refers to the current context, so go there
// to find the actual type being constructed.
CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
return DeclarationNameInfo();
// Determine the type of the class being constructed.
QualType CurClassType = Context.getTypeDeclType(CurClass);
// FIXME: Check two things: that the template-id names the same type as
// CurClassType, and that the template-id does not occur when the name
// was qualified.
NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
Context.getCanonicalType(CurClassType)));
NameInfo.setLoc(Name.StartLocation);
// FIXME: should we retrieve TypeSourceInfo?
NameInfo.setNamedTypeInfo(0);
return NameInfo;
}
case UnqualifiedId::IK_DestructorName: {
TypeSourceInfo *TInfo;
QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
if (Ty.isNull())
return DeclarationNameInfo();
NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
Context.getCanonicalType(Ty)));
NameInfo.setLoc(Name.StartLocation);
NameInfo.setNamedTypeInfo(TInfo);
return NameInfo;
}
case UnqualifiedId::IK_TemplateId: {
TemplateName TName = Name.TemplateId->Template.get();
SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
return Context.getNameForTemplate(TName, TNameLoc);
}
} // switch (Name.getKind())
llvm_unreachable("Unknown name kind");
}
static QualType getCoreType(QualType Ty) {
do {
if (Ty->isPointerType() || Ty->isReferenceType())
Ty = Ty->getPointeeType();
else if (Ty->isArrayType())
Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
else
return Ty.withoutLocalFastQualifiers();
} while (true);
}
/// hasSimilarParameters - Determine whether the C++ functions Declaration
/// and Definition have "nearly" matching parameters. This heuristic is
/// used to improve diagnostics in the case where an out-of-line function
/// definition doesn't match any declaration within the class or namespace.
/// Also sets Params to the list of indices to the parameters that differ
/// between the declaration and the definition. If hasSimilarParameters
/// returns true and Params is empty, then all of the parameters match.
static bool hasSimilarParameters(ASTContext &Context,
FunctionDecl *Declaration,
FunctionDecl *Definition,
llvm::SmallVectorImpl<unsigned> &Params) {
Params.clear();
if (Declaration->param_size() != Definition->param_size())
return false;
for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
// The parameter types are identical
if (Context.hasSameType(DefParamTy, DeclParamTy))
continue;
QualType DeclParamBaseTy = getCoreType(DeclParamTy);
QualType DefParamBaseTy = getCoreType(DefParamTy);
const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
(DeclTyName && DeclTyName == DefTyName))
Params.push_back(Idx);
else // The two parameters aren't even close
return false;
}
return true;
}
/// NeedsRebuildingInCurrentInstantiation - Checks whether the given
/// declarator needs to be rebuilt in the current instantiation.
/// Any bits of declarator which appear before the name are valid for
/// consideration here. That's specifically the type in the decl spec
/// and the base type in any member-pointer chunks.
static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
DeclarationName Name) {
// The types we specifically need to rebuild are:
// - typenames, typeofs, and decltypes
// - types which will become injected class names
// Of course, we also need to rebuild any type referencing such a
// type. It's safest to just say "dependent", but we call out a
// few cases here.
DeclSpec &DS = D.getMutableDeclSpec();
switch (DS.getTypeSpecType()) {
case DeclSpec::TST_typename:
case DeclSpec::TST_typeofType:
case DeclSpec::TST_decltype:
case DeclSpec::TST_underlyingType:
case DeclSpec::TST_atomic: {
// Grab the type from the parser.
TypeSourceInfo *TSI = 0;
QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
if (T.isNull() || !T->isDependentType()) break;
// Make sure there's a type source info. This isn't really much
// of a waste; most dependent types should have type source info
// attached already.
if (!TSI)
TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
// Rebuild the type in the current instantiation.
TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
if (!TSI) return true;
// Store the new type back in the decl spec.
ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
DS.UpdateTypeRep(LocType);
break;
}
case DeclSpec::TST_typeofExpr: {
Expr *E = DS.getRepAsExpr();
ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
if (Result.isInvalid()) return true;
DS.UpdateExprRep(Result.get());
break;
}
default:
// Nothing to do for these decl specs.
break;
}
// It doesn't matter what order we do this in.
for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
DeclaratorChunk &Chunk = D.getTypeObject(I);
// The only type information in the declarator which can come
// before the declaration name is the base type of a member
// pointer.
if (Chunk.Kind != DeclaratorChunk::MemberPointer)
continue;
// Rebuild the scope specifier in-place.
CXXScopeSpec &SS = Chunk.Mem.Scope();
if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
return true;
}
return false;
}
Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
D.setFunctionDefinitionKind(FDK_Declaration);
Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg());
if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() &&
Dcl && Dcl->getDeclContext()->isFileContext())
Dcl->setTopLevelDeclInObjCContainer();
return Dcl;
}
/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
/// If T is the name of a class, then each of the following shall have a
/// name different from T:
/// - every static data member of class T;
/// - every member function of class T
/// - every member of class T that is itself a type;
/// \returns true if the declaration name violates these rules.
bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
DeclarationNameInfo NameInfo) {
DeclarationName Name = NameInfo.getName();
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC))
if (Record->getIdentifier() && Record->getDeclName() == Name) {
Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
return true;
}
return false;
}
/// \brief Diagnose a declaration whose declarator-id has the given
/// nested-name-specifier.
///
/// \param SS The nested-name-specifier of the declarator-id.
///
/// \param DC The declaration context to which the nested-name-specifier
/// resolves.
///
/// \param Name The name of the entity being declared.
///
/// \param Loc The location of the name of the entity being declared.
///
/// \returns true if we cannot safely recover from this error, false otherwise.
bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
DeclarationName Name,
SourceLocation Loc) {
DeclContext *Cur = CurContext;
while (isa<LinkageSpecDecl>(Cur))
Cur = Cur->getParent();
// C++ [dcl.meaning]p1:
// A declarator-id shall not be qualified except for the definition
// of a member function (9.3) or static data member (9.4) outside of
// its class, the definition or explicit instantiation of a function
// or variable member of a namespace outside of its namespace, or the
// definition of an explicit specialization outside of its namespace,
// or the declaration of a friend function that is a member of
// another class or namespace (11.3). [...]
// The user provided a superfluous scope specifier that refers back to the
// class or namespaces in which the entity is already declared.
//
// class X {
// void X::f();
// };
if (Cur->Equals(DC)) {
Diag(Loc, LangOpts.MicrosoftExt? diag::warn_member_extra_qualification
: diag::err_member_extra_qualification)
<< Name << FixItHint::CreateRemoval(SS.getRange());
SS.clear();
return false;
}
// Check whether the qualifying scope encloses the scope of the original
// declaration.
if (!Cur->Encloses(DC)) {
if (Cur->isRecord())
Diag(Loc, diag::err_member_qualification)
<< Name << SS.getRange();
else if (isa<TranslationUnitDecl>(DC))
Diag(Loc, diag::err_invalid_declarator_global_scope)
<< Name << SS.getRange();
else if (isa<FunctionDecl>(Cur))
Diag(Loc, diag::err_invalid_declarator_in_function)
<< Name << SS.getRange();
else
Diag(Loc, diag::err_invalid_declarator_scope)
<< Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange();
return true;
}
if (Cur->isRecord()) {
// Cannot qualify members within a class.
Diag(Loc, diag::err_member_qualification)
<< Name << SS.getRange();
SS.clear();
// C++ constructors and destructors with incorrect scopes can break
// our AST invariants by having the wrong underlying types. If
// that's the case, then drop this declaration entirely.
if ((Name.getNameKind() == DeclarationName::CXXConstructorName ||
Name.getNameKind() == DeclarationName::CXXDestructorName) &&
!Context.hasSameType(Name.getCXXNameType(),
Context.getTypeDeclType(cast<CXXRecordDecl>(Cur))))
return true;
return false;
}
// C++11 [dcl.meaning]p1:
// [...] "The nested-name-specifier of the qualified declarator-id shall
// not begin with a decltype-specifer"
NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data());
while (SpecLoc.getPrefix())
SpecLoc = SpecLoc.getPrefix();
if (dyn_cast_or_null<DecltypeType>(
SpecLoc.getNestedNameSpecifier()->getAsType()))
Diag(Loc, diag::err_decltype_in_declarator)
<< SpecLoc.getTypeLoc().getSourceRange();
return false;
}
Decl *Sema::HandleDeclarator(Scope *S, Declarator &D,
MultiTemplateParamsArg TemplateParamLists) {
// TODO: consider using NameInfo for diagnostic.
DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
DeclarationName Name = NameInfo.getName();
// All of these full declarators require an identifier. If it doesn't have
// one, the ParsedFreeStandingDeclSpec action should be used.
if (!Name) {
if (!D.isInvalidType()) // Reject this if we think it is valid.
Diag(D.getDeclSpec().getLocStart(),
diag::err_declarator_need_ident)
<< D.getDeclSpec().getSourceRange() << D.getSourceRange();
return 0;
} else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
return 0;
// The scope passed in may not be a decl scope. Zip up the scope tree until
// we find one that is.
while ((S->getFlags() & Scope::DeclScope) == 0 ||
(S->getFlags() & Scope::TemplateParamScope) != 0)
S = S->getParent();
DeclContext *DC = CurContext;
if (D.getCXXScopeSpec().isInvalid())
D.setInvalidType();
else if (D.getCXXScopeSpec().isSet()) {
if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
UPPC_DeclarationQualifier))
return 0;
bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
if (!DC) {
// If we could not compute the declaration context, it's because the
// declaration context is dependent but does not refer to a class,
// class template, or class template partial specialization. Complain
// and return early, to avoid the coming semantic disaster.
Diag(D.getIdentifierLoc(),
diag::err_template_qualified_declarator_no_match)
<< (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
<< D.getCXXScopeSpec().getRange();
return 0;
}
bool IsDependentContext = DC->isDependentContext();
if (!IsDependentContext &&
RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
return 0;
if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
Diag(D.getIdentifierLoc(),
diag::err_member_def_undefined_record)
<< Name << DC << D.getCXXScopeSpec().getRange();
D.setInvalidType();
} else if (!D.getDeclSpec().isFriendSpecified()) {
if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC,
Name, D.getIdentifierLoc())) {
if (DC->isRecord())
return 0;
D.setInvalidType();
}
}
// Check whether we need to rebuild the type of the given
// declaration in the current instantiation.
if (EnteringContext && IsDependentContext &&
TemplateParamLists.size() != 0) {
ContextRAII SavedContext(*this, DC);
if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
D.setInvalidType();
}
}
if (DiagnoseClassNameShadow(DC, NameInfo))
// If this is a typedef, we'll end up spewing multiple diagnostics.
// Just return early; it's safer.
if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
return 0;
NamedDecl *New;
TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType R = TInfo->getType();
if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
UPPC_DeclarationType))
D.setInvalidType();
LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
ForRedeclaration);
// See if this is a redefinition of a variable in the same scope.
if (!D.getCXXScopeSpec().isSet()) {
bool IsLinkageLookup = false;
// If the declaration we're planning to build will be a function
// or object with linkage, then look for another declaration with
// linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
/* Do nothing*/;
else if (R->isFunctionType()) {
if (CurContext->isFunctionOrMethod() ||
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
IsLinkageLookup = true;
} else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
IsLinkageLookup = true;
else if (CurContext->getRedeclContext()->isTranslationUnit() &&
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
IsLinkageLookup = true;
if (IsLinkageLookup)
Previous.clear(LookupRedeclarationWithLinkage);
LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
} else { // Something like "int foo::x;"
LookupQualifiedName(Previous, DC);
// C++ [dcl.meaning]p1:
// When the declarator-id is qualified, the declaration shall refer to a
// previously declared member of the class or namespace to which the
// qualifier refers (or, in the case of a namespace, of an element of the
// inline namespace set of that namespace (7.3.1)) or to a specialization
// thereof; [...]
//
// Note that we already checked the context above, and that we do not have
// enough information to make sure that Previous contains the declaration
// we want to match. For example, given:
//
// class X {
// void f();
// void f(float);
// };
//
// void X::f(int) { } // ill-formed
//
// In this case, Previous will point to the overload set
// containing the two f's declared in X, but neither of them
// matches.
// C++ [dcl.meaning]p1:
// [...] the member shall not merely have been introduced by a
// using-declaration in the scope of the class or namespace nominated by
// the nested-name-specifier of the declarator-id.
RemoveUsingDecls(Previous);
}
if (Previous.isSingleResult() &&
Previous.getFoundDecl()->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
if (!D.isInvalidType())
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
Previous.getFoundDecl());
// Just pretend that we didn't see the previous declaration.
Previous.clear();
}
// In C++, the previous declaration we find might be a tag type
// (class or enum). In this case, the new declaration will hide the
// tag type. Note that this does does not apply if we're declaring a
// typedef (C++ [dcl.typedef]p4).
if (Previous.isSingleTagDecl() &&
D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
Previous.clear();
bool AddToScope = true;
if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
if (TemplateParamLists.size()) {
Diag(D.getIdentifierLoc(), diag::err_template_typedef);
return 0;
}
New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
} else if (R->isFunctionType()) {
New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
TemplateParamLists,
AddToScope);
} else {
New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
TemplateParamLists);
}
if (New == 0)
return 0;
// If this has an identifier and is not an invalid redeclaration or
// function template specialization, add it to the scope stack.
if (New->getDeclName() && AddToScope &&
!(D.isRedeclaration() && New->isInvalidDecl()))
PushOnScopeChains(New, S);
return New;
}
/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
/// types into constant array types in certain situations which would otherwise
/// be errors (for GCC compatibility).
static QualType TryToFixInvalidVariablyModifiedType(QualType T,
ASTContext &Context,
bool &SizeIsNegative,
llvm::APSInt &Oversized) {
// This method tries to turn a variable array into a constant
// array even when the size isn't an ICE. This is necessary
// for compatibility with code that depends on gcc's buggy
// constant expression folding, like struct {char x[(int)(char*)2];}
SizeIsNegative = false;
Oversized = 0;
if (T->isDependentType())
return QualType();
QualifierCollector Qs;
const Type *Ty = Qs.strip(T);
if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
QualType Pointee = PTy->getPointeeType();
QualType FixedType =
TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
Oversized);
if (FixedType.isNull()) return FixedType;
FixedType = Context.getPointerType(FixedType);
return Qs.apply(Context, FixedType);
}
if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
QualType Inner = PTy->getInnerType();
QualType FixedType =
TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
Oversized);
if (FixedType.isNull()) return FixedType;
FixedType = Context.getParenType(FixedType);
return Qs.apply(Context, FixedType);
}
const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
if (!VLATy)
return QualType();
// FIXME: We should probably handle this case
if (VLATy->getElementType()->isVariablyModifiedType())
return QualType();
llvm::APSInt Res;
if (!VLATy->getSizeExpr() ||
!VLATy->getSizeExpr()->EvaluateAsInt(Res, Context))
return QualType();
// Check whether the array size is negative.
if (Res.isSigned() && Res.isNegative()) {
SizeIsNegative = true;
return QualType();
}
// Check whether the array is too large to be addressed.
unsigned ActiveSizeBits
= ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
Res);
if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
Oversized = Res;
return QualType();
}
return Context.getConstantArrayType(VLATy->getElementType(),
Res, ArrayType::Normal, 0);
}
/// \brief Register the given locally-scoped external C declaration so
/// that it can be found later for redeclarations
void
Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
const LookupResult &Previous,
Scope *S) {
assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
"Decl is not a locally-scoped decl!");
// Note that we have a locally-scoped external with this name.
LocallyScopedExternalDecls[ND->getDeclName()] = ND;
if (!Previous.isSingleResult())
return;
NamedDecl *PrevDecl = Previous.getFoundDecl();
// If there was a previous declaration of this variable, it may be
// in our identifier chain. Update the identifier chain with the new
// declaration.
if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
// The previous declaration was found on the identifer resolver
// chain, so remove it from its scope.
if (S->isDeclScope(PrevDecl)) {
// Special case for redeclarations in the SAME scope.
// Because this declaration is going to be added to the identifier chain
// later, we should temporarily take it OFF the chain.
IdResolver.RemoveDecl(ND);
} else {
// Find the scope for the original declaration.
while (S && !S->isDeclScope(PrevDecl))
S = S->getParent();
}
if (S)
S->RemoveDecl(PrevDecl);
}
}
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
Sema::findLocallyScopedExternalDecl(DeclarationName Name) {
if (ExternalSource) {
// Load locally-scoped external decls from the external source.
SmallVector<NamedDecl *, 4> Decls;
ExternalSource->ReadLocallyScopedExternalDecls(Decls);
for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= LocallyScopedExternalDecls.find(Decls[I]->getDeclName());
if (Pos == LocallyScopedExternalDecls.end())
LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I];
}
}
return LocallyScopedExternalDecls.find(Name);
}
/// \brief Diagnose function specifiers on a declaration of an identifier that
/// does not identify a function.
void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
// FIXME: We should probably indicate the identifier in question to avoid
// confusion for constructs like "inline int a(), b;"
if (D.getDeclSpec().isInlineSpecified())
Diag(D.getDeclSpec().getInlineSpecLoc(),
diag::err_inline_non_function);
if (D.getDeclSpec().isVirtualSpecified())
Diag(D.getDeclSpec().getVirtualSpecLoc(),
diag::err_virtual_non_function);
if (D.getDeclSpec().isExplicitSpecified())
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::err_explicit_non_function);
}
NamedDecl*
Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
TypeSourceInfo *TInfo, LookupResult &Previous) {
// Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
if (D.getCXXScopeSpec().isSet()) {
Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
<< D.getCXXScopeSpec().getRange();
D.setInvalidType();
// Pretend we didn't see the scope specifier.
DC = CurContext;
Previous.clear();
}
if (getLangOpts().CPlusPlus) {
// Check that there are no default arguments (C++ only).
CheckExtraCXXDefaultArguments(D);
}
DiagnoseFunctionSpecifiers(D);
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
if (D.getDeclSpec().isConstexprSpecified())
Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
<< 1;
if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
<< D.getName().getSourceRange();
return 0;
}
TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
if (!NewTD) return 0;
// Handle attributes prior to checking for duplicates in MergeVarDecl
ProcessDeclAttributes(S, NewTD, D);
CheckTypedefForVariablyModifiedType(S, NewTD);
bool Redeclaration = D.isRedeclaration();
NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
D.setRedeclaration(Redeclaration);
return ND;
}
void
Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
// C99 6.7.7p2: If a typedef name specifies a variably modified type
// then it shall have block scope.
// Note that variably modified types must be fixed before merging the decl so
// that redeclarations will match.
QualType T = NewTD->getUnderlyingType();
if (T->isVariablyModifiedType()) {
getCurFunction()->setHasBranchProtectedScope();
if (S->getFnParent() == 0) {
bool SizeIsNegative;
llvm::APSInt Oversized;
QualType FixedTy =
TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
Oversized);
if (!FixedTy.isNull()) {
Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
} else {
if (SizeIsNegative)
Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
else if (T->isVariableArrayType())
Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
else if (Oversized.getBoolValue())
Diag(NewTD->getLocation(), diag::err_array_too_large)
<< Oversized.toString(10);
else
Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
NewTD->setInvalidDecl();
}
}
}
}
/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
/// declares a typedef-name, either using the 'typedef' type specifier or via
/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
NamedDecl*
Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
LookupResult &Previous, bool &Redeclaration) {
// Merge the decl with the existing one if appropriate. If the decl is
// in an outer scope, it isn't the same thing.
FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false,
/*ExplicitInstantiationOrSpecialization=*/false);
if (!Previous.empty()) {
Redeclaration = true;
MergeTypedefNameDecl(NewTD, Previous);
}
// If this is the C FILE type, notify the AST context.
if (IdentifierInfo *II = NewTD->getIdentifier())
if (!NewTD->isInvalidDecl() &&
NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
if (II->isStr("FILE"))
Context.setFILEDecl(NewTD);
else if (II->isStr("jmp_buf"))
Context.setjmp_bufDecl(NewTD);
else if (II->isStr("sigjmp_buf"))
Context.setsigjmp_bufDecl(NewTD);
else if (II->isStr("ucontext_t"))
Context.setucontext_tDecl(NewTD);
}
return NewTD;
}
/// \brief Determines whether the given declaration is an out-of-scope
/// previous declaration.
///
/// This routine should be invoked when name lookup has found a
/// previous declaration (PrevDecl) that is not in the scope where a
/// new declaration by the same name is being introduced. If the new
/// declaration occurs in a local scope, previous declarations with
/// linkage may still be considered previous declarations (C99
/// 6.2.2p4-5, C++ [basic.link]p6).
///
/// \param PrevDecl the previous declaration found by name
/// lookup
///
/// \param DC the context in which the new declaration is being
/// declared.
///
/// \returns true if PrevDecl is an out-of-scope previous declaration
/// for a new delcaration with the same name.
static bool
isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
ASTContext &Context) {
if (!PrevDecl)
return false;
if (!PrevDecl->hasLinkage())
return false;
if (Context.getLangOpts().CPlusPlus) {
// C++ [basic.link]p6:
// If there is a visible declaration of an entity with linkage
// having the same name and type, ignoring entities declared
// outside the innermost enclosing namespace scope, the block
// scope declaration declares that same entity and receives the
// linkage of the previous declaration.
DeclContext *OuterContext = DC->getRedeclContext();
if (!OuterContext->isFunctionOrMethod())
// This rule only applies to block-scope declarations.
return false;
DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
if (PrevOuterContext->isRecord())
// We found a member function: ignore it.
return false;
// Find the innermost enclosing namespace for the new and
// previous declarations.
OuterContext = OuterContext->getEnclosingNamespaceContext();
PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
// The previous declaration is in a different namespace, so it
// isn't the same function.
if (!OuterContext->Equals(PrevOuterContext))
return false;
}
return true;
}
static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
CXXScopeSpec &SS = D.getCXXScopeSpec();
if (!SS.isSet()) return;
DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
}
bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
QualType type = decl->getType();
Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
if (lifetime == Qualifiers::OCL_Autoreleasing) {
// Various kinds of declaration aren't allowed to be __autoreleasing.
unsigned kind = -1U;
if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
if (var->hasAttr<BlocksAttr>())
kind = 0; // __block
else if (!var->hasLocalStorage())
kind = 1; // global
} else if (isa<ObjCIvarDecl>(decl)) {
kind = 3; // ivar
} else if (isa<FieldDecl>(decl)) {
kind = 2; // field
}
if (kind != -1U) {
Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
<< kind;
}
} else if (lifetime == Qualifiers::OCL_None) {
// Try to infer lifetime.
if (!type->isObjCLifetimeType())
return false;
lifetime = type->getObjCARCImplicitLifetime();
type = Context.getLifetimeQualifiedType(type, lifetime);
decl->setType(type);
}
if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
// Thread-local variables cannot have lifetime.
if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
var->isThreadSpecified()) {
Diag(var->getLocation(), diag::err_arc_thread_ownership)
<< var->getType();
return true;
}
}
return false;
}
NamedDecl*
Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
TypeSourceInfo *TInfo, LookupResult &Previous,
MultiTemplateParamsArg TemplateParamLists) {
QualType R = TInfo->getType();
DeclarationName Name = GetNameForDeclarator(D).getName();
// Check that there are no default arguments (C++ only).
if (getLangOpts().CPlusPlus)
CheckExtraCXXDefaultArguments(D);
DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
assert(SCSpec != DeclSpec::SCS_typedef &&
"Parser allowed 'typedef' as storage class VarDecl.");
VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
if (SCSpec == DeclSpec::SCS_mutable) {
// mutable can only appear on non-static class members, so it's always
// an error here
Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
D.setInvalidType();
SC = SC_None;
}
SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
VarDecl::StorageClass SCAsWritten
= StorageClassSpecToVarDeclStorageClass(SCSpec);
IdentifierInfo *II = Name.getAsIdentifierInfo();
if (!II) {
Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
<< Name;
return 0;
}
DiagnoseFunctionSpecifiers(D);
if (!DC->isRecord() && S->getFnParent() == 0) {
// C99 6.9p2: The storage-class specifiers auto and register shall not
// appear in the declaration specifiers in an external declaration.
if (SC == SC_Auto || SC == SC_Register) {
// If this is a register variable with an asm label specified, then this
// is a GNU extension.
if (SC == SC_Register && D.getAsmLabel())
Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
else
Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
D.setInvalidType();
}
}
if (getLangOpts().OpenCL) {
// Set up the special work-group-local storage class for variables in the
// OpenCL __local address space.
if (R.getAddressSpace() == LangAS::opencl_local)
SC = SC_OpenCLWorkGroupLocal;
}
bool isExplicitSpecialization = false;
VarDecl *NewVD;
if (!getLangOpts().CPlusPlus) {
NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
D.getIdentifierLoc(), II,
R, TInfo, SC, SCAsWritten);
if (D.isInvalidType())
NewVD->setInvalidDecl();
} else {
if (DC->isRecord() && !CurContext->isRecord()) {
// This is an out-of-line definition of a static data member.
if (SC == SC_Static) {
Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_static_out_of_line)
<< FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
} else if (SC == SC_None)
SC = SC_Static;
}
if (SC == SC_Static && CurContext->isRecord()) {
if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
if (RD->isLocalClass())
Diag(D.getIdentifierLoc(),
diag::err_static_data_member_not_allowed_in_local_class)
<< Name << RD->getDeclName();
// C++98 [class.union]p1: If a union contains a static data member,
// the program is ill-formed. C++11 drops this restriction.
if (RD->isUnion())
Diag(D.getIdentifierLoc(),
getLangOpts().CPlusPlus0x
? diag::warn_cxx98_compat_static_data_member_in_union
: diag::ext_static_data_member_in_union) << Name;
// We conservatively disallow static data members in anonymous structs.
else if (!RD->getDeclName())
Diag(D.getIdentifierLoc(),
diag::err_static_data_member_not_allowed_in_anon_struct)
<< Name << RD->isUnion();
}
}
// Match up the template parameter lists with the scope specifier, then
// determine whether we have a template or a template specialization.
isExplicitSpecialization = false;
bool Invalid = false;
if (TemplateParameterList *TemplateParams
= MatchTemplateParametersToScopeSpecifier(
D.getDeclSpec().getLocStart(),
D.getIdentifierLoc(),
D.getCXXScopeSpec(),
TemplateParamLists.data(),
TemplateParamLists.size(),
/*never a friend*/ false,
isExplicitSpecialization,
Invalid)) {
if (TemplateParams->size() > 0) {
// There is no such thing as a variable template.
Diag(D.getIdentifierLoc(), diag::err_template_variable)
<< II
<< SourceRange(TemplateParams->getTemplateLoc(),
TemplateParams->getRAngleLoc());
return 0;
} else {
// There is an extraneous 'template<>' for this variable. Complain
// about it, but allow the declaration of the variable.
Diag(TemplateParams->getTemplateLoc(),
diag::err_template_variable_noparams)
<< II
<< SourceRange(TemplateParams->getTemplateLoc(),
TemplateParams->getRAngleLoc());
}
}
NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
D.getIdentifierLoc(), II,
R, TInfo, SC, SCAsWritten);
// If this decl has an auto type in need of deduction, make a note of the
// Decl so we can diagnose uses of it in its own initializer.
if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto &&
R->getContainedAutoType())
ParsingInitForAutoVars.insert(NewVD);
if (D.isInvalidType() || Invalid)
NewVD->setInvalidDecl();
SetNestedNameSpecifier(NewVD, D);
if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) {
NewVD->setTemplateParameterListsInfo(Context,
TemplateParamLists.size(),
TemplateParamLists.data());
}
if (D.getDeclSpec().isConstexprSpecified())
NewVD->setConstexpr(true);
}
// Set the lexical context. If the declarator has a C++ scope specifier, the
// lexical context will be different from the semantic context.
NewVD->setLexicalDeclContext(CurContext);
if (D.getDeclSpec().isThreadSpecified()) {
if (NewVD->hasLocalStorage())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
else if (!Context.getTargetInfo().isTLSSupported())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
else
NewVD->setThreadSpecified(true);
}
if (D.getDeclSpec().isModulePrivateSpecified()) {
if (isExplicitSpecialization)
Diag(NewVD->getLocation(), diag::err_module_private_specialization)
<< 2
<< FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
else if (NewVD->hasLocalStorage())
Diag(NewVD->getLocation(), diag::err_module_private_local)
<< 0 << NewVD->getDeclName()
<< SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
<< FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
else
NewVD->setModulePrivate();
}
// Handle attributes prior to checking for duplicates in MergeVarDecl
ProcessDeclAttributes(S, NewVD, D);
if (getLangOpts().CUDA) {
// CUDA B.2.5: "__shared__ and __constant__ variables have implied static
// storage [duration]."
if (SC == SC_None && S->getFnParent() != 0 &&
(NewVD->hasAttr<CUDASharedAttr>() || NewVD->hasAttr<CUDAConstantAttr>()))
NewVD->setStorageClass(SC_Static);
}
// In auto-retain/release, infer strong retension for variables of
// retainable type.
if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
NewVD->setInvalidDecl();
// Handle GNU asm-label extension (encoded as an attribute).
if (Expr *E = (Expr*)D.getAsmLabel()) {
// The parser guarantees this is a string.
StringLiteral *SE = cast<StringLiteral>(E);
StringRef Label = SE->getString();
if (S->getFnParent() != 0) {
switch (SC) {
case SC_None:
case SC_Auto:
Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
break;
case SC_Register:
if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
break;
case SC_Static:
case SC_Extern:
case SC_PrivateExtern:
case SC_OpenCLWorkGroupLocal:
break;
}
}
NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
Context, Label));
} else if (!ExtnameUndeclaredIdentifiers.empty()) {
llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
if (I != ExtnameUndeclaredIdentifiers.end()) {
NewVD->addAttr(I->second);
ExtnameUndeclaredIdentifiers.erase(I);
}
}
// Diagnose shadowed variables before filtering for scope.
if (!D.getCXXScopeSpec().isSet())
CheckShadow(S, NewVD, Previous);
// Don't consider existing declarations that are in a different
// scope and are out-of-semantic-context declarations (if the new
// declaration has linkage).
FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(),
isExplicitSpecialization);
if (!getLangOpts().CPlusPlus) {
D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
} else {
// Merge the decl with the existing one if appropriate.
if (!Previous.empty()) {
if (Previous.isSingleResult() &&
isa<FieldDecl>(Previous.getFoundDecl()) &&
D.getCXXScopeSpec().isSet()) {
// The user tried to define a non-static data member
// out-of-line (C++ [dcl.meaning]p1).
Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
<< D.getCXXScopeSpec().getRange();
Previous.clear();
NewVD->setInvalidDecl();
}
} else if (D.getCXXScopeSpec().isSet()) {
// No previous declaration in the qualifying scope.
Diag(D.getIdentifierLoc(), diag::err_no_member)
<< Name << computeDeclContext(D.getCXXScopeSpec(), true)
<< D.getCXXScopeSpec().getRange();
NewVD->setInvalidDecl();
}
D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
// This is an explicit specialization of a static data member. Check it.
if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
CheckMemberSpecialization(NewVD, Previous))
NewVD->setInvalidDecl();
}
// If this is a locally-scoped extern C variable, update the map of
// such variables.
if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
!NewVD->isInvalidDecl())
RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
// If there's a #pragma GCC visibility in scope, and this isn't a class
// member, set the visibility of this variable.
if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord())
AddPushedVisibilityAttribute(NewVD);
MarkUnusedFileScopedDecl(NewVD);
return NewVD;
}
/// \brief Diagnose variable or built-in function shadowing. Implements
/// -Wshadow.
///
/// This method is called whenever a VarDecl is added to a "useful"
/// scope.
///
/// \param S the scope in which the shadowing name is being declared
/// \param R the lookup of the name
///
void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
// Return if warning is ignored.
if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) ==
DiagnosticsEngine::Ignored)
return;
// Don't diagnose declarations at file scope.
if (D->hasGlobalStorage())
return;
DeclContext *NewDC = D->getDeclContext();
// Only diagnose if we're shadowing an unambiguous field or variable.
if (R.getResultKind() != LookupResult::Found)
return;
NamedDecl* ShadowedDecl = R.getFoundDecl();
if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
return;
// Fields are not shadowed by variables in C++ static methods.
if (isa<FieldDecl>(ShadowedDecl))
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
if (MD->isStatic())
return;
if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
if (shadowedVar->isExternC()) {
// For shadowing external vars, make sure that we point to the global
// declaration, not a locally scoped extern declaration.
for (VarDecl::redecl_iterator
I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end();
I != E; ++I)
if (I->isFileVarDecl()) {
ShadowedDecl = *I;
break;
}
}
DeclContext *OldDC = ShadowedDecl->getDeclContext();
// Only warn about certain kinds of shadowing for class members.
if (NewDC && NewDC->isRecord()) {
// In particular, don't warn about shadowing non-class members.
if (!OldDC->isRecord())
return;
// TODO: should we warn about static data members shadowing
// static data members from base classes?
// TODO: don't diagnose for inaccessible shadowed members.
// This is hard to do perfectly because we might friend the
// shadowing context, but that's just a false negative.
}
// Determine what kind of declaration we're shadowing.
unsigned Kind;
if (isa<RecordDecl>(OldDC)) {
if (isa<FieldDecl>(ShadowedDecl))
Kind = 3; // field
else
Kind = 2; // static data member
} else if (OldDC->isFileContext())
Kind = 1; // global
else
Kind = 0; // local
DeclarationName Name = R.getLookupName();
// Emit warning and note.
Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
}
/// \brief Check -Wshadow without the advantage of a previous lookup.
void Sema::CheckShadow(Scope *S, VarDecl *D) {
if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) ==
DiagnosticsEngine::Ignored)
return;
LookupResult R(*this, D->getDeclName(), D->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
LookupName(R, S);
CheckShadow(S, D, R);
}
/// \brief Perform semantic checking on a newly-created variable
/// declaration.
///
/// This routine performs all of the type-checking required for a
/// variable declaration once it has been built. It is used both to
/// check variables after they have been parsed and their declarators
/// have been translated into a declaration, and to check variables
/// that have been instantiated from a template.
///
/// Sets NewVD->isInvalidDecl() if an error was encountered.
///
/// Returns true if the variable declaration is a redeclaration.
bool Sema::CheckVariableDeclaration(VarDecl *NewVD,
LookupResult &Previous) {
// If the decl is already known invalid, don't check it.
if (NewVD->isInvalidDecl())
return false;
QualType T = NewVD->getType();
if (T->isObjCObjectType()) {
Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
<< FixItHint::CreateInsertion(NewVD->getLocation(), "*");
T = Context.getObjCObjectPointerType(T);
NewVD->setType(T);
}
// Emit an error if an address space was applied to decl with local storage.
// This includes arrays of objects with address space qualifiers, but not
// automatic variables that point to other address spaces.
// ISO/IEC TR 18037 S5.1.2
if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
NewVD->setInvalidDecl();
return false;
}
// OpenCL v1.2 s6.8 -- The static qualifier is valid only in program
// scope.
if ((getLangOpts().OpenCLVersion >= 120)
&& NewVD->isStaticLocal()) {
Diag(NewVD->getLocation(), diag::err_static_function_scope);
NewVD->setInvalidDecl();
return false;
}
if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
&& !NewVD->hasAttr<BlocksAttr>()) {
if (getLangOpts().getGC() != LangOptions::NonGC)
Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
else
Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
}
bool isVM = T->isVariablyModifiedType();
if (isVM || NewVD->hasAttr<CleanupAttr>() ||
NewVD->hasAttr<BlocksAttr>())
getCurFunction()->setHasBranchProtectedScope();
if ((isVM && NewVD->hasLinkage()) ||
(T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
bool SizeIsNegative;
llvm::APSInt Oversized;
QualType FixedTy =
TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
Oversized);
if (FixedTy.isNull() && T->isVariableArrayType()) {
const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
// FIXME: This won't give the correct result for
// int a[10][n];
SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
if (NewVD->isFileVarDecl())
Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
<< SizeRange;
else if (NewVD->getStorageClass() == SC_Static)
Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
<< SizeRange;
else
Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
<< SizeRange;
NewVD->setInvalidDecl();
return false;
}
if (FixedTy.isNull()) {
if (NewVD->isFileVarDecl())
Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
else
Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
NewVD->setInvalidDecl();
return false;
}
Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
NewVD->setType(FixedTy);
}
if (Previous.empty() && NewVD->isExternC()) {
// Since we did not find anything by this name and we're declaring
// an extern "C" variable, look for a non-visible extern "C"
// declaration with the same name.
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= findLocallyScopedExternalDecl(NewVD->getDeclName());
if (Pos != LocallyScopedExternalDecls.end())
Previous.addDecl(Pos->second);
}
if (T->isVoidType() && !NewVD->hasExternalStorage()) {
Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
<< T;
NewVD->setInvalidDecl();
return false;
}
if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
NewVD->setInvalidDecl();
return false;
}
if (isVM && NewVD->hasAttr<BlocksAttr>()) {
Diag(NewVD->getLocation(), diag::err_block_on_vm);
NewVD->setInvalidDecl();
return false;
}
if (NewVD->isConstexpr() && !T->isDependentType() &&
RequireLiteralType(NewVD->getLocation(), T,
diag::err_constexpr_var_non_literal)) {
NewVD->setInvalidDecl();
return false;
}
if (!Previous.empty()) {
MergeVarDecl(NewVD, Previous);
return true;
}
return false;
}
/// \brief Data used with FindOverriddenMethod
struct FindOverriddenMethodData {
Sema *S;
CXXMethodDecl *Method;
};
/// \brief Member lookup function that determines whether a given C++
/// method overrides a method in a base class, to be used with
/// CXXRecordDecl::lookupInBases().
static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
CXXBasePath &Path,
void *UserData) {
RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
FindOverriddenMethodData *Data
= reinterpret_cast<FindOverriddenMethodData*>(UserData);
DeclarationName Name = Data->Method->getDeclName();
// FIXME: Do we care about other names here too?
if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
// We really want to find the base class destructor here.
QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
CanQualType CT = Data->S->Context.getCanonicalType(T);
Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
}
for (Path.Decls = BaseRecord->lookup(Name);
Path.Decls.first != Path.Decls.second;
++Path.Decls.first) {
NamedDecl *D = *Path.Decls.first;
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
return true;
}
}
return false;
}
/// AddOverriddenMethods - See if a method overrides any in the base classes,
/// and if so, check that it's a valid override and remember it.
bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
// Look for virtual methods in base classes that this method might override.
CXXBasePaths Paths;
FindOverriddenMethodData Data;
Data.Method = MD;
Data.S = this;
bool AddedAny = false;
if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
E = Paths.found_decls_end(); I != E; ++I) {
if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
MD->addOverriddenMethod(OldMD->getCanonicalDecl());
if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
!CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
!CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
AddedAny = true;
}
}
}
}
return AddedAny;
}
namespace {
// Struct for holding all of the extra arguments needed by
// DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
struct ActOnFDArgs {
Scope *S;
Declarator &D;
MultiTemplateParamsArg TemplateParamLists;
bool AddToScope;
};
}
namespace {
// Callback to only accept typo corrections that have a non-zero edit distance.
// Also only accept corrections that have the same parent decl.
class DifferentNameValidatorCCC : public CorrectionCandidateCallback {
public:
DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD,
CXXRecordDecl *Parent)
: Context(Context), OriginalFD(TypoFD),
ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {}
virtual bool ValidateCandidate(const TypoCorrection &candidate) {
if (candidate.getEditDistance() == 0)
return false;
llvm::SmallVector<unsigned, 1> MismatchedParams;
for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(),
CDeclEnd = candidate.end();
CDecl != CDeclEnd; ++CDecl) {
FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
if (FD && !FD->hasBody() &&
hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) {
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
CXXRecordDecl *Parent = MD->getParent();
if (Parent && Parent->getCanonicalDecl() == ExpectedParent)
return true;
} else if (!ExpectedParent) {
return true;
}
}
}
return false;
}
private:
ASTContext &Context;
FunctionDecl *OriginalFD;
CXXRecordDecl *ExpectedParent;
};
}
/// \brief Generate diagnostics for an invalid function redeclaration.
///
/// This routine handles generating the diagnostic messages for an invalid
/// function redeclaration, including finding possible similar declarations
/// or performing typo correction if there are no previous declarations with
/// the same name.
///
/// Returns a NamedDecl iff typo correction was performed and substituting in
/// the new declaration name does not cause new errors.
static NamedDecl* DiagnoseInvalidRedeclaration(
Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
ActOnFDArgs &ExtraArgs) {
NamedDecl *Result = NULL;
DeclarationName Name = NewFD->getDeclName();
DeclContext *NewDC = NewFD->getDeclContext();
LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
llvm::SmallVector<unsigned, 1> MismatchedParams;
llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches;
TypoCorrection Correction;
bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus &&
ExtraArgs.D.getDeclSpec().isFriendSpecified());
unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend
: diag::err_member_def_does_not_match;
NewFD->setInvalidDecl();
SemaRef.LookupQualifiedName(Prev, NewDC);
assert(!Prev.isAmbiguous() &&
"Cannot have an ambiguity in previous-declaration lookup");
CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD,
MD ? MD->getParent() : 0);
if (!Prev.empty()) {
for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
Func != FuncEnd; ++Func) {
FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
if (FD &&
hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
// Add 1 to the index so that 0 can mean the mismatch didn't
// involve a parameter
unsigned ParamNum =
MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
NearMatches.push_back(std::make_pair(FD, ParamNum));
}
}
// If the qualified name lookup yielded nothing, try typo correction
} else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(),
Prev.getLookupKind(), 0, 0,
Validator, NewDC))) {
// Trap errors.
Sema::SFINAETrap Trap(SemaRef);
// Set up everything for the call to ActOnFunctionDeclarator
ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
ExtraArgs.D.getIdentifierLoc());
Previous.clear();
Previous.setLookupName(Correction.getCorrection());
for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
CDeclEnd = Correction.end();
CDecl != CDeclEnd; ++CDecl) {
FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
if (FD && !FD->hasBody() &&
hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
Previous.addDecl(FD);
}
}
bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
// TODO: Refactor ActOnFunctionDeclarator so that we can call only the
// pieces need to verify the typo-corrected C++ declaraction and hopefully
// eliminate the need for the parameter pack ExtraArgs.
Result = SemaRef.ActOnFunctionDeclarator(
ExtraArgs.S, ExtraArgs.D,
Correction.getCorrectionDecl()->getDeclContext(),
NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists,
ExtraArgs.AddToScope);
if (Trap.hasErrorOccurred()) {
// Pretend the typo correction never occurred
ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
ExtraArgs.D.getIdentifierLoc());
ExtraArgs.D.setRedeclaration(wasRedeclaration);
Previous.clear();
Previous.setLookupName(Name);
Result = NULL;
} else {
for (LookupResult::iterator Func = Previous.begin(),
FuncEnd = Previous.end();
Func != FuncEnd; ++Func) {
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func))
NearMatches.push_back(std::make_pair(FD, 0));
}
}
if (NearMatches.empty()) {
// Ignore the correction if it didn't yield any close FunctionDecl matches
Correction = TypoCorrection();
} else {
DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest
: diag::err_member_def_does_not_match_suggest;
}
}
if (Correction) {
SourceRange FixItLoc(NewFD->getLocation());
CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec();
if (Correction.getCorrectionSpecifier() && SS.isValid())
FixItLoc.setBegin(SS.getBeginLoc());
SemaRef.Diag(NewFD->getLocStart(), DiagMsg)
<< Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts())
<< FixItHint::CreateReplacement(
FixItLoc, Correction.getAsString(SemaRef.getLangOpts()));
} else {
SemaRef.Diag(NewFD->getLocation(), DiagMsg)
<< Name << NewDC << NewFD->getLocation();
}
bool NewFDisConst = false;
if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
NewFDisConst = NewMD->isConst();
for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator
NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
NearMatch != NearMatchEnd; ++NearMatch) {
FunctionDecl *FD = NearMatch->first;
bool FDisConst = false;
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
FDisConst = MD->isConst();
if (unsigned Idx = NearMatch->second) {
ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
SourceLocation Loc = FDParam->getTypeSpecStartLoc();
if (Loc.isInvalid()) Loc = FD->getLocation();
SemaRef.Diag(Loc, diag::note_member_def_close_param_match)
<< Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType();
} else if (Correction) {
SemaRef.Diag(FD->getLocation(), diag::note_previous_decl)
<< Correction.getQuoted(SemaRef.getLangOpts());
} else if (FDisConst != NewFDisConst) {
SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
<< NewFDisConst << FD->getSourceRange().getEnd();
} else
SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match);
}
return Result;
}
static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef,
Declarator &D) {
switch (D.getDeclSpec().getStorageClassSpec()) {
default: llvm_unreachable("Unknown storage class!");
case DeclSpec::SCS_auto:
case DeclSpec::SCS_register:
case DeclSpec::SCS_mutable:
SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_typecheck_sclass_func);
D.setInvalidType();
break;
case DeclSpec::SCS_unspecified: break;
case DeclSpec::SCS_extern: return SC_Extern;
case DeclSpec::SCS_static: {
if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
// C99 6.7.1p5:
// The declaration of an identifier for a function that has
// block scope shall have no explicit storage-class specifier
// other than extern
// See also (C++ [dcl.stc]p4).
SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_static_block_func);
break;
} else
return SC_Static;
}
case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
}
// No explicit storage class has already been returned
return SC_None;
}
static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
DeclContext *DC, QualType &R,
TypeSourceInfo *TInfo,
FunctionDecl::StorageClass SC,
bool &IsVirtualOkay) {
DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
DeclarationName Name = NameInfo.getName();
FunctionDecl *NewFD = 0;
bool isInline = D.getDeclSpec().isInlineSpecified();
DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
FunctionDecl::StorageClass SCAsWritten
= StorageClassSpecToFunctionDeclStorageClass(SCSpec);
if (!SemaRef.getLangOpts().CPlusPlus) {
// Determine whether the function was written with a
// prototype. This true when:
// - there is a prototype in the declarator, or
// - the type R of the function is some kind of typedef or other reference
// to a type name (which eventually refers to a function type).
bool HasPrototype =
(D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
(!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
NewFD = FunctionDecl::Create(SemaRef.Context, DC,
D.getLocStart(), NameInfo, R,
TInfo, SC, SCAsWritten, isInline,
HasPrototype);
if (D.isInvalidType())
NewFD->setInvalidDecl();
// Set the lexical context.
NewFD->setLexicalDeclContext(SemaRef.CurContext);
return NewFD;
}
bool isExplicit = D.getDeclSpec().isExplicitSpecified();
bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
// Check that the return type is not an abstract class type.
// For record types, this is done by the AbstractClassUsageDiagnoser once
// the class has been completely parsed.
if (!DC->isRecord() &&
SemaRef.RequireNonAbstractType(D.getIdentifierLoc(),
R->getAs<FunctionType>()->getResultType(),
diag::err_abstract_type_in_decl,
SemaRef.AbstractReturnType))
D.setInvalidType();
if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
// This is a C++ constructor declaration.
assert(DC->isRecord() &&
"Constructors can only be declared in a member context");
R = SemaRef.CheckConstructorDeclarator(D, R, SC);
return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
D.getLocStart(), NameInfo,
R, TInfo, isExplicit, isInline,
/*isImplicitlyDeclared=*/false,
isConstexpr);
} else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
// This is a C++ destructor declaration.
if (DC->isRecord()) {
R = SemaRef.CheckDestructorDeclarator(D, R, SC);
CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
SemaRef.Context, Record,
D.getLocStart(),
NameInfo, R, TInfo, isInline,
/*isImplicitlyDeclared=*/false);
// If the class is complete, then we now create the implicit exception
// specification. If the class is incomplete or dependent, we can't do
// it yet.
if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() &&
Record->getDefinition() && !Record->isBeingDefined() &&
R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
}
IsVirtualOkay = true;
return NewDD;
} else {
SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
D.setInvalidType();
// Create a FunctionDecl to satisfy the function definition parsing
// code path.
return FunctionDecl::Create(SemaRef.Context, DC,
D.getLocStart(),
D.getIdentifierLoc(), Name, R, TInfo,
SC, SCAsWritten, isInline,
/*hasPrototype=*/true, isConstexpr);
}
} else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
if (!DC->isRecord()) {
SemaRef.Diag(D.getIdentifierLoc(),
diag::err_conv_function_not_member);
return 0;
}
SemaRef.CheckConversionDeclarator(D, R, SC);
IsVirtualOkay = true;
return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
D.getLocStart(), NameInfo,
R, TInfo, isInline, isExplicit,
isConstexpr, SourceLocation());
} else if (DC->isRecord()) {
// If the name of the function is the same as the name of the record,
// then this must be an invalid constructor that has a return type.
// (The parser checks for a return type and makes the declarator a
// constructor if it has no return type).
if (Name.getAsIdentifierInfo() &&
Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
<< SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
<< SourceRange(D.getIdentifierLoc());
return 0;
}
bool isStatic = SC == SC_Static;
// [class.free]p1:
// Any allocation function for a class T is a static member
// (even if not explicitly declared static).
if (Name.getCXXOverloadedOperator() == OO_New ||
Name.getCXXOverloadedOperator() == OO_Array_New)
isStatic = true;
// [class.free]p6 Any deallocation function for a class X is a static member
// (even if not explicitly declared static).
if (Name.getCXXOverloadedOperator() == OO_Delete ||
Name.getCXXOverloadedOperator() == OO_Array_Delete)
isStatic = true;
IsVirtualOkay = !isStatic;
// This is a C++ method declaration.
return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
D.getLocStart(), NameInfo, R,
TInfo, isStatic, SCAsWritten, isInline,
isConstexpr, SourceLocation());
} else {
// Determine whether the function was written with a
// prototype. This true when:
// - we're in C++ (where every function has a prototype),
return FunctionDecl::Create(SemaRef.Context, DC,
D.getLocStart(),
NameInfo, R, TInfo, SC, SCAsWritten, isInline,
true/*HasPrototype*/, isConstexpr);
}
}
void Sema::checkVoidParamDecl(ParmVarDecl *Param) {
// In C++, the empty parameter-type-list must be spelled "void"; a
// typedef of void is not permitted.
if (getLangOpts().CPlusPlus &&
Param->getType().getUnqualifiedType() != Context.VoidTy) {
bool IsTypeAlias = false;
if (const TypedefType *TT = Param->getType()->getAs<TypedefType>())
IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl());
else if (const TemplateSpecializationType *TST =
Param->getType()->getAs<TemplateSpecializationType>())
IsTypeAlias = TST->isTypeAlias();
Diag(Param->getLocation(), diag::err_param_typedef_of_void)
<< IsTypeAlias;
}
}
NamedDecl*
Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
TypeSourceInfo *TInfo, LookupResult &Previous,
MultiTemplateParamsArg TemplateParamLists,
bool &AddToScope) {
QualType R = TInfo->getType();
assert(R.getTypePtr()->isFunctionType());
// TODO: consider using NameInfo for diagnostic.
DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
DeclarationName Name = NameInfo.getName();
FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D);
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
// Do not allow returning a objc interface by-value.
if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
Diag(D.getIdentifierLoc(),
diag::err_object_cannot_be_passed_returned_by_value) << 0
<< R->getAs<FunctionType>()->getResultType()
<< FixItHint::CreateInsertion(D.getIdentifierLoc(), "*");
QualType T = R->getAs<FunctionType>()->getResultType();
T = Context.getObjCObjectPointerType(T);
if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) {
FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
R = Context.getFunctionType(T, FPT->arg_type_begin(),
FPT->getNumArgs(), EPI);
}
else if (isa<FunctionNoProtoType>(R))
R = Context.getFunctionNoProtoType(T);
}
bool isFriend = false;
FunctionTemplateDecl *FunctionTemplate = 0;
bool isExplicitSpecialization = false;
bool isFunctionTemplateSpecialization = false;
bool isDependentClassScopeExplicitSpecialization = false;
bool HasExplicitTemplateArgs = false;
TemplateArgumentListInfo TemplateArgs;
bool isVirtualOkay = false;
FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
isVirtualOkay);
if (!NewFD) return 0;
if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer())
NewFD->setTopLevelDeclInObjCContainer();
if (getLangOpts().CPlusPlus) {
bool isInline = D.getDeclSpec().isInlineSpecified();
bool isVirtual = D.getDeclSpec().isVirtualSpecified();
bool isExplicit = D.getDeclSpec().isExplicitSpecified();
bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
isFriend = D.getDeclSpec().isFriendSpecified();
if (isFriend && !isInline && D.isFunctionDefinition()) {
// C++ [class.friend]p5
// A function can be defined in a friend declaration of a
// class . . . . Such a function is implicitly inline.
NewFD->setImplicitlyInline();
}
// If this is a method defined in an __interface, and is not a constructor
// or an overloaded operator, then set the pure flag (isVirtual will already
// return true).
if (const CXXRecordDecl *Parent =
dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) {
if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided())
NewFD->setPure(true);
}
SetNestedNameSpecifier(NewFD, D);
isExplicitSpecialization = false;
isFunctionTemplateSpecialization = false;
if (D.isInvalidType())
NewFD->setInvalidDecl();
// Set the lexical context. If the declarator has a C++
// scope specifier, or is the object of a friend declaration, the
// lexical context will be different from the semantic context.
NewFD->setLexicalDeclContext(CurContext);
// Match up the template parameter lists with the scope specifier, then
// determine whether we have a template or a template specialization.
bool Invalid = false;
if (TemplateParameterList *TemplateParams
= MatchTemplateParametersToScopeSpecifier(
D.getDeclSpec().getLocStart(),
D.getIdentifierLoc(),
D.getCXXScopeSpec(),
TemplateParamLists.data(),
TemplateParamLists.size(),
isFriend,
isExplicitSpecialization,
Invalid)) {
if (TemplateParams->size() > 0) {
// This is a function template
// Check that we can declare a template here.
if (CheckTemplateDeclScope(S, TemplateParams))
return 0;
// A destructor cannot be a template.
if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
Diag(NewFD->getLocation(), diag::err_destructor_template);
return 0;
}
// If we're adding a template to a dependent context, we may need to
// rebuilding some of the types used within the template parameter list,
// now that we know what the current instantiation is.
if (DC->isDependentContext()) {
ContextRAII SavedContext(*this, DC);
if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
Invalid = true;
}
FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
NewFD->getLocation(),
Name, TemplateParams,
NewFD);
FunctionTemplate->setLexicalDeclContext(CurContext);
NewFD->setDescribedFunctionTemplate(FunctionTemplate);
// For source fidelity, store the other template param lists.
if (TemplateParamLists.size() > 1) {
NewFD->setTemplateParameterListsInfo(Context,
TemplateParamLists.size() - 1,
TemplateParamLists.data());
}
} else {
// This is a function template specialization.
isFunctionTemplateSpecialization = true;
// For source fidelity, store all the template param lists.
NewFD->setTemplateParameterListsInfo(Context,
TemplateParamLists.size(),
TemplateParamLists.data());
// C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
if (isFriend) {
// We want to remove the "template<>", found here.
SourceRange RemoveRange = TemplateParams->getSourceRange();
// If we remove the template<> and the name is not a
// template-id, we're actually silently creating a problem:
// the friend declaration will refer to an untemplated decl,
// and clearly the user wants a template specialization. So
// we need to insert '<>' after the name.
SourceLocation InsertLoc;
if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
InsertLoc = D.getName().getSourceRange().getEnd();
InsertLoc = PP.getLocForEndOfToken(InsertLoc);
}
Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
<< Name << RemoveRange
<< FixItHint::CreateRemoval(RemoveRange)
<< FixItHint::CreateInsertion(InsertLoc, "<>");
}
}
}
else {
// All template param lists were matched against the scope specifier:
// this is NOT (an explicit specialization of) a template.
if (TemplateParamLists.size() > 0)
// For source fidelity, store all the template param lists.
NewFD->setTemplateParameterListsInfo(Context,
TemplateParamLists.size(),
TemplateParamLists.data());
}
if (Invalid) {
NewFD->setInvalidDecl();
if (FunctionTemplate)
FunctionTemplate->setInvalidDecl();
}
// C++ [dcl.fct.spec]p5:
// The virtual specifier shall only be used in declarations of
// nonstatic class member functions that appear within a
// member-specification of a class declaration; see 10.3.
//
if (isVirtual && !NewFD->isInvalidDecl()) {
if (!isVirtualOkay) {
Diag(D.getDeclSpec().getVirtualSpecLoc(),
diag::err_virtual_non_function);
} else if (!CurContext->isRecord()) {
// 'virtual' was specified outside of the class.
Diag(D.getDeclSpec().getVirtualSpecLoc(),
diag::err_virtual_out_of_class)
<< FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
} else if (NewFD->getDescribedFunctionTemplate()) {
// C++ [temp.mem]p3:
// A member function template shall not be virtual.
Diag(D.getDeclSpec().getVirtualSpecLoc(),
diag::err_virtual_member_function_template)
<< FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
} else {
// Okay: Add virtual to the method.
NewFD->setVirtualAsWritten(true);
}
}
// C++ [dcl.fct.spec]p3:
// The inline specifier shall not appear on a block scope function
// declaration.
if (isInline && !NewFD->isInvalidDecl()) {
if (CurContext->isFunctionOrMethod()) {
// 'inline' is not allowed on block scope function declaration.
Diag(D.getDeclSpec().getInlineSpecLoc(),
diag::err_inline_declaration_block_scope) << Name
<< FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
}
}
// C++ [dcl.fct.spec]p6:
// The explicit specifier shall be used only in the declaration of a
// constructor or conversion function within its class definition;
// see 12.3.1 and 12.3.2.
if (isExplicit && !NewFD->isInvalidDecl()) {
if (!CurContext->isRecord()) {
// 'explicit' was specified outside of the class.
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::err_explicit_out_of_class)
<< FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
} else if (!isa<CXXConstructorDecl>(NewFD) &&
!isa<CXXConversionDecl>(NewFD)) {
// 'explicit' was specified on a function that wasn't a constructor
// or conversion function.
Diag(D.getDeclSpec().getExplicitSpecLoc(),
diag::err_explicit_non_ctor_or_conv_function)
<< FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
}
}
if (isConstexpr) {
// C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors
// are implicitly inline.
NewFD->setImplicitlyInline();
// C++0x [dcl.constexpr]p3: functions declared constexpr are required to
// be either constructors or to return a literal type. Therefore,
// destructors cannot be declared constexpr.
if (isa<CXXDestructorDecl>(NewFD))
Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
}
// If __module_private__ was specified, mark the function accordingly.
if (D.getDeclSpec().isModulePrivateSpecified()) {
if (isFunctionTemplateSpecialization) {
SourceLocation ModulePrivateLoc
= D.getDeclSpec().getModulePrivateSpecLoc();
Diag(ModulePrivateLoc, diag::err_module_private_specialization)
<< 0
<< FixItHint::CreateRemoval(ModulePrivateLoc);
} else {
NewFD->setModulePrivate();
if (FunctionTemplate)
FunctionTemplate->setModulePrivate();
}
}
if (isFriend) {
// For now, claim that the objects have no previous declaration.
if (FunctionTemplate) {
FunctionTemplate->setObjectOfFriendDecl(false);
FunctionTemplate->setAccess(AS_public);
}
NewFD->setObjectOfFriendDecl(false);
NewFD->setAccess(AS_public);
}
// If a function is defined as defaulted or deleted, mark it as such now.
switch (D.getFunctionDefinitionKind()) {
case FDK_Declaration:
case FDK_Definition:
break;
case FDK_Defaulted:
NewFD->setDefaulted();
break;
case FDK_Deleted:
NewFD->setDeletedAsWritten();
break;
}
if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
D.isFunctionDefinition()) {
// C++ [class.mfct]p2:
// A member function may be defined (8.4) in its class definition, in
// which case it is an inline member function (7.1.2)
NewFD->setImplicitlyInline();
}
if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
!CurContext->isRecord()) {
// C++ [class.static]p1:
// A data or function member of a class may be declared static
// in a class definition, in which case it is a static member of
// the class.
// Complain about the 'static' specifier if it's on an out-of-line
// member function definition.
Diag(D.getDeclSpec().getStorageClassSpecLoc(),
diag::err_static_out_of_line)
<< FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
}
}
// Filter out previous declarations that don't match the scope.
FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(),
isExplicitSpecialization ||
isFunctionTemplateSpecialization);
// Handle GNU asm-label extension (encoded as an attribute).
if (Expr *E = (Expr*) D.getAsmLabel()) {
// The parser guarantees this is a string.
StringLiteral *SE = cast<StringLiteral>(E);
NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
SE->getString()));
} else if (!ExtnameUndeclaredIdentifiers.empty()) {
llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
if (I != ExtnameUndeclaredIdentifiers.end()) {
NewFD->addAttr(I->second);
ExtnameUndeclaredIdentifiers.erase(I);
}
}
// Copy the parameter declarations from the declarator D to the function
// declaration NewFD, if they are available. First scavenge them into Params.
SmallVector<ParmVarDecl*, 16> Params;
if (D.isFunctionDeclarator()) {
DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
// Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
// function that takes no arguments, not a function that takes a
// single void argument.
// We let through "const void" here because Sema::GetTypeForDeclarator
// already checks for that case.
if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
FTI.ArgInfo[0].Param &&
cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
// Empty arg list, don't push any params.
checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param));
} else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
assert(Param->getDeclContext() != NewFD && "Was set before ?");
Param->setDeclContext(NewFD);
Params.push_back(Param);
if (Param->isInvalidDecl())
NewFD->setInvalidDecl();
}
}
} else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
// When we're declaring a function with a typedef, typeof, etc as in the
// following example, we'll need to synthesize (unnamed)
// parameters for use in the declaration.
//
// @code
// typedef void fn(int);
// fn f;
// @endcode
// Synthesize a parameter for each argument type.
for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
AE = FT->arg_type_end(); AI != AE; ++AI) {
ParmVarDecl *Param =
BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
Param->setScopeInfo(0, Params.size());
Params.push_back(Param);
}
} else {
assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
"Should not need args for typedef of non-prototype fn");
}
// Finally, we know we have the right number of parameters, install them.
NewFD->setParams(Params);
// Find all anonymous symbols defined during the declaration of this function
// and add to NewFD. This lets us track decls such 'enum Y' in:
//
// void f(enum Y {AA} x) {}
//
// which would otherwise incorrectly end up in the translation unit scope.
NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope);
DeclsInPrototypeScope.clear();
// Process the non-inheritable attributes on this declaration.
ProcessDeclAttributes(S, NewFD, D,
/*NonInheritable=*/true, /*Inheritable=*/false);
// Functions returning a variably modified type violate C99 6.7.5.2p2
// because all functions have linkage.
if (!NewFD->isInvalidDecl() &&
NewFD->getResultType()->isVariablyModifiedType()) {
Diag(NewFD->getLocation(), diag::err_vm_func_decl);
NewFD->setInvalidDecl();
}
// Handle attributes.
ProcessDeclAttributes(S, NewFD, D,
/*NonInheritable=*/false, /*Inheritable=*/true);
if (!getLangOpts().CPlusPlus) {
// Perform semantic checking on the function declaration.
bool isExplicitSpecialization=false;
if (!NewFD->isInvalidDecl()) {
if (NewFD->isMain())
CheckMain(NewFD, D.getDeclSpec());
D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
isExplicitSpecialization));
}
// Make graceful recovery from an invalid redeclaration.
else if (!Previous.empty())
D.setRedeclaration(true);
assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
Previous.getResultKind() != LookupResult::FoundOverloaded) &&
"previous declaration set still overloaded");
} else {
// If the declarator is a template-id, translate the parser's template
// argument list into our AST format.
if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
TemplateId->NumArgs);
translateTemplateArguments(TemplateArgsPtr,
TemplateArgs);
HasExplicitTemplateArgs = true;
if (NewFD->isInvalidDecl()) {
HasExplicitTemplateArgs = false;
} else if (FunctionTemplate) {
// Function template with explicit template arguments.
Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
<< SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
HasExplicitTemplateArgs = false;
} else if (!isFunctionTemplateSpecialization &&
!D.getDeclSpec().isFriendSpecified()) {
// We have encountered something that the user meant to be a
// specialization (because it has explicitly-specified template
// arguments) but that was not introduced with a "template<>" (or had
// too few of them).
Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
<< SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
<< FixItHint::CreateInsertion(
D.getDeclSpec().getLocStart(),
"template<> ");
isFunctionTemplateSpecialization = true;
} else {
// "friend void foo<>(int);" is an implicit specialization decl.
isFunctionTemplateSpecialization = true;
}
} else if (isFriend && isFunctionTemplateSpecialization) {
// This combination is only possible in a recovery case; the user
// wrote something like:
// template <> friend void foo(int);
// which we're recovering from as if the user had written:
// friend void foo<>(int);
// Go ahead and fake up a template id.
HasExplicitTemplateArgs = true;
TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
}
// If it's a friend (and only if it's a friend), it's possible
// that either the specialized function type or the specialized
// template is dependent, and therefore matching will fail. In
// this case, don't check the specialization yet.
bool InstantiationDependent = false;
if (isFunctionTemplateSpecialization && isFriend &&
(NewFD->getType()->isDependentType() || DC->isDependentContext() ||
TemplateSpecializationType::anyDependentTemplateArguments(
TemplateArgs.getArgumentArray(), TemplateArgs.size(),
InstantiationDependent))) {
assert(HasExplicitTemplateArgs &&
"friend function specialization without template args");
if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
Previous))
NewFD->setInvalidDecl();
} else if (isFunctionTemplateSpecialization) {
if (CurContext->isDependentContext() && CurContext->isRecord()
&& !isFriend) {
isDependentClassScopeExplicitSpecialization = true;
Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
diag::ext_function_specialization_in_class :
diag::err_function_specialization_in_class)
<< NewFD->getDeclName();
} else if (CheckFunctionTemplateSpecialization(NewFD,
(HasExplicitTemplateArgs ? &TemplateArgs : 0),
Previous))
NewFD->setInvalidDecl();
// C++ [dcl.stc]p1:
// A storage-class-specifier shall not be specified in an explicit
// specialization (14.7.3)
if (SC != SC_None) {
if (SC != NewFD->getStorageClass())
Diag(NewFD->getLocation(),
diag::err_explicit_specialization_inconsistent_storage_class)
<< SC
<< FixItHint::CreateRemoval(
D.getDeclSpec().getStorageClassSpecLoc());
else
Diag(NewFD->getLocation(),
diag::ext_explicit_specialization_storage_class)
<< FixItHint::CreateRemoval(
D.getDeclSpec().getStorageClassSpecLoc());
}
} else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
if (CheckMemberSpecialization(NewFD, Previous))
NewFD->setInvalidDecl();
}
// Perform semantic checking on the function declaration.
if (!isDependentClassScopeExplicitSpecialization) {
if (NewFD->isInvalidDecl()) {
// If this is a class member, mark the class invalid immediately.
// This avoids some consistency errors later.
if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD))
methodDecl->getParent()->setInvalidDecl();
} else {
if (NewFD->isMain())
CheckMain(NewFD, D.getDeclSpec());
D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
isExplicitSpecialization));
}
}
assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
Previous.getResultKind() != LookupResult::FoundOverloaded) &&
"previous declaration set still overloaded");
NamedDecl *PrincipalDecl = (FunctionTemplate
? cast<NamedDecl>(FunctionTemplate)
: NewFD);
if (isFriend && D.isRedeclaration()) {
AccessSpecifier Access = AS_public;
if (!NewFD->isInvalidDecl())
Access = NewFD->getPreviousDecl()->getAccess();
NewFD->setAccess(Access);
if (FunctionTemplate) FunctionTemplate->setAccess(Access);
PrincipalDecl->setObjectOfFriendDecl(true);
}
if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
PrincipalDecl->setNonMemberOperator();
// If we have a function template, check the template parameter
// list. This will check and merge default template arguments.
if (FunctionTemplate) {
FunctionTemplateDecl *PrevTemplate =
FunctionTemplate->getPreviousDecl();
CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
PrevTemplate ? PrevTemplate->getTemplateParameters() : 0,
D.getDeclSpec().isFriendSpecified()
? (D.isFunctionDefinition()
? TPC_FriendFunctionTemplateDefinition
: TPC_FriendFunctionTemplate)
: (D.getCXXScopeSpec().isSet() &&
DC && DC->isRecord() &&
DC->isDependentContext())
? TPC_ClassTemplateMember
: TPC_FunctionTemplate);
}
if (NewFD->isInvalidDecl()) {
// Ignore all the rest of this.
} else if (!D.isRedeclaration()) {
struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
AddToScope };
// Fake up an access specifier if it's supposed to be a class member.
if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
NewFD->setAccess(AS_public);
// Qualified decls generally require a previous declaration.
if (D.getCXXScopeSpec().isSet()) {
// ...with the major exception of templated-scope or
// dependent-scope friend declarations.
// TODO: we currently also suppress this check in dependent
// contexts because (1) the parameter depth will be off when
// matching friend templates and (2) we might actually be
// selecting a friend based on a dependent factor. But there
// are situations where these conditions don't apply and we
// can actually do this check immediately.
if (isFriend &&
(TemplateParamLists.size() ||
D.getCXXScopeSpec().getScopeRep()->isDependent() ||
CurContext->isDependentContext())) {
// ignore these
} else {
// The user tried to provide an out-of-line definition for a
// function that is a member of a class or namespace, but there
// was no such member function declared (C++ [class.mfct]p2,
// C++ [namespace.memdef]p2). For example:
//
// class X {
// void f() const;
// };
//
// void X::f() { } // ill-formed
//
// Complain about this problem, and attempt to suggest close
// matches (e.g., those that differ only in cv-qualifiers and
// whether the parameter types are references).
if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
NewFD,
ExtraArgs)) {
AddToScope = ExtraArgs.AddToScope;
return Result;
}
}
// Unqualified local friend declarations are required to resolve
// to something.
} else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
NewFD,
ExtraArgs)) {
AddToScope = ExtraArgs.AddToScope;
return Result;
}
}
} else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() &&
!isFriend && !isFunctionTemplateSpecialization &&
!isExplicitSpecialization) {
// An out-of-line member function declaration must also be a
// definition (C++ [dcl.meaning]p1).
// Note that this is not the case for explicit specializations of
// function templates or member functions of class templates, per
// C++ [temp.expl.spec]p2. We also allow these declarations as an
// extension for compatibility with old SWIG code which likes to
// generate them.
Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
<< D.getCXXScopeSpec().getRange();
}
}
AddKnownFunctionAttributes(NewFD);
if (NewFD->hasAttr<OverloadableAttr>() &&
!NewFD->getType()->getAs<FunctionProtoType>()) {
Diag(NewFD->getLocation(),
diag::err_attribute_overloadable_no_prototype)
<< NewFD;
// Turn this into a variadic function with no parameters.
const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
FunctionProtoType::ExtProtoInfo EPI;
EPI.Variadic = true;
EPI.ExtInfo = FT->getExtInfo();
QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI);
NewFD->setType(R);
}
// If there's a #pragma GCC visibility in scope, and this isn't a class
// member, set the visibility of this function.
if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord())
AddPushedVisibilityAttribute(NewFD);
// If there's a #pragma clang arc_cf_code_audited in scope, consider
// marking the function.
AddCFAuditedAttribute(NewFD);
// If this is a locally-scoped extern C function, update the
// map of such names.
if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
&& !NewFD->isInvalidDecl())
RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
// Set this FunctionDecl's range up to the right paren.
NewFD->setRangeEnd(D.getSourceRange().getEnd());
if (getLangOpts().CPlusPlus) {
if (FunctionTemplate) {
if (NewFD->isInvalidDecl())
FunctionTemplate->setInvalidDecl();
return FunctionTemplate;
}
}
// OpenCL v1.2 s6.8 static is invalid for kernel functions.
if ((getLangOpts().OpenCLVersion >= 120)
&& NewFD->hasAttr<OpenCLKernelAttr>()
&& (SC == SC_Static)) {
Diag(D.getIdentifierLoc(), diag::err_static_kernel);
D.setInvalidType();
}
MarkUnusedFileScopedDecl(NewFD);
if (getLangOpts().CUDA)
if (IdentifierInfo *II = NewFD->getIdentifier())
if (!NewFD->isInvalidDecl() &&
NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
if (II->isStr("cudaConfigureCall")) {
if (!R->getAs<FunctionType>()->getResultType()->isScalarType())
Diag(NewFD->getLocation(), diag::err_config_scalar_return);
Context.setcudaConfigureCallDecl(NewFD);
}
}
// Here we have an function template explicit specialization at class scope.
// The actually specialization will be postponed to template instatiation
// time via the ClassScopeFunctionSpecializationDecl node.
if (isDependentClassScopeExplicitSpecialization) {
ClassScopeFunctionSpecializationDecl *NewSpec =
ClassScopeFunctionSpecializationDecl::Create(
Context, CurContext, SourceLocation(),
cast<CXXMethodDecl>(NewFD),
HasExplicitTemplateArgs, TemplateArgs);
CurContext->addDecl(NewSpec);
AddToScope = false;
}
return NewFD;
}
/// \brief Perform semantic checking of a new function declaration.
///
/// Performs semantic analysis of the new function declaration
/// NewFD. This routine performs all semantic checking that does not
/// require the actual declarator involved in the declaration, and is
/// used both for the declaration of functions as they are parsed
/// (called via ActOnDeclarator) and for the declaration of functions
/// that have been instantiated via C++ template instantiation (called
/// via InstantiateDecl).
///
/// \param IsExplicitSpecialization whether this new function declaration is
/// an explicit specialization of the previous declaration.
///
/// This sets NewFD->isInvalidDecl() to true if there was an error.
///
/// \returns true if the function declaration is a redeclaration.
bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
LookupResult &Previous,
bool IsExplicitSpecialization) {
assert(!NewFD->getResultType()->isVariablyModifiedType()
&& "Variably modified return types are not handled here");
// Check for a previous declaration of this name.
if (Previous.empty() && NewFD->isExternC()) {
// Since we did not find anything by this name and we're declaring
// an extern "C" function, look for a non-visible extern "C"
// declaration with the same name.
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= findLocallyScopedExternalDecl(NewFD->getDeclName());
if (Pos != LocallyScopedExternalDecls.end())
Previous.addDecl(Pos->second);
}
bool Redeclaration = false;
// Merge or overload the declaration with an existing declaration of
// the same name, if appropriate.
if (!Previous.empty()) {
// Determine whether NewFD is an overload of PrevDecl or
// a declaration that requires merging. If it's an overload,
// there's no more work to do here; we'll just add the new
// function to the scope.
NamedDecl *OldDecl = 0;
if (!AllowOverloadingOfFunction(Previous, Context)) {
Redeclaration = true;
OldDecl = Previous.getFoundDecl();
} else {
switch (CheckOverload(S, NewFD, Previous, OldDecl,
/*NewIsUsingDecl*/ false)) {
case Ovl_Match:
Redeclaration = true;
break;
case Ovl_NonFunction:
Redeclaration = true;
break;
case Ovl_Overload:
Redeclaration = false;
break;
}
if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
// If a function name is overloadable in C, then every function
// with that name must be marked "overloadable".
Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
<< Redeclaration << NewFD;
NamedDecl *OverloadedDecl = 0;
if (Redeclaration)
OverloadedDecl = OldDecl;
else if (!Previous.empty())
OverloadedDecl = Previous.getRepresentativeDecl();
if (OverloadedDecl)
Diag(OverloadedDecl->getLocation(),
diag::note_attribute_overloadable_prev_overload);
NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(),
Context));
}
}
if (Redeclaration) {
// NewFD and OldDecl represent declarations that need to be
// merged.
if (MergeFunctionDecl(NewFD, OldDecl, S)) {
NewFD->setInvalidDecl();
return Redeclaration;
}
Previous.clear();
Previous.addDecl(OldDecl);
if (FunctionTemplateDecl *OldTemplateDecl
= dyn_cast<FunctionTemplateDecl>(OldDecl)) {
NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
FunctionTemplateDecl *NewTemplateDecl
= NewFD->getDescribedFunctionTemplate();
assert(NewTemplateDecl && "Template/non-template mismatch");
if (CXXMethodDecl *Method
= dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
Method->setAccess(OldTemplateDecl->getAccess());
NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
}
// If this is an explicit specialization of a member that is a function
// template, mark it as a member specialization.
if (IsExplicitSpecialization &&
NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
NewTemplateDecl->setMemberSpecialization();
assert(OldTemplateDecl->isMemberSpecialization());
}
} else {
if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
NewFD->setAccess(OldDecl->getAccess());
NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
}
}
}
// Semantic checking for this function declaration (in isolation).
if (getLangOpts().CPlusPlus) {
// C++-specific checks.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
CheckConstructor(Constructor);
} else if (CXXDestructorDecl *Destructor =
dyn_cast<CXXDestructorDecl>(NewFD)) {
CXXRecordDecl *Record = Destructor->getParent();
QualType ClassType = Context.getTypeDeclType(Record);
// FIXME: Shouldn't we be able to perform this check even when the class
// type is dependent? Both gcc and edg can handle that.
if (!ClassType->isDependentType()) {
DeclarationName Name
= Context.DeclarationNames.getCXXDestructorName(
Context.getCanonicalType(ClassType));
if (NewFD->getDeclName() != Name) {
Diag(NewFD->getLocation(), diag::err_destructor_name);
NewFD->setInvalidDecl();
return Redeclaration;
}
}
} else if (CXXConversionDecl *Conversion
= dyn_cast<CXXConversionDecl>(NewFD)) {
ActOnConversionDeclarator(Conversion);
}
// Find any virtual functions that this function overrides.
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
if (!Method->isFunctionTemplateSpecialization() &&
!Method->getDescribedFunctionTemplate()) {
if (AddOverriddenMethods(Method->getParent(), Method)) {
// If the function was marked as "static", we have a problem.
if (NewFD->getStorageClass() == SC_Static) {
Diag(NewFD->getLocation(), diag::err_static_overrides_virtual)
<< NewFD->getDeclName();
for (CXXMethodDecl::method_iterator
Overridden = Method->begin_overridden_methods(),
OverriddenEnd = Method->end_overridden_methods();
Overridden != OverriddenEnd;
++Overridden) {
Diag((*Overridden)->getLocation(),
diag::note_overridden_virtual_function);
}
}
}
}
if (Method->isStatic())
checkThisInStaticMemberFunctionType(Method);
}
// Extra checking for C++ overloaded operators (C++ [over.oper]).
if (NewFD->isOverloadedOperator() &&
CheckOverloadedOperatorDeclaration(NewFD)) {
NewFD->setInvalidDecl();
return Redeclaration;
}
// Extra checking for C++0x literal operators (C++0x [over.literal]).
if (NewFD->getLiteralIdentifier() &&
CheckLiteralOperatorDeclaration(NewFD)) {
NewFD->setInvalidDecl();
return Redeclaration;
}
// In C++, check default arguments now that we have merged decls. Unless
// the lexical context is the class, because in this case this is done
// during delayed parsing anyway.
if (!CurContext->isRecord())
CheckCXXDefaultArguments(NewFD);
// If this function declares a builtin function, check the type of this
// declaration against the expected type for the builtin.
if (unsigned BuiltinID = NewFD->getBuiltinID()) {
ASTContext::GetBuiltinTypeError Error;
QualType T = Context.GetBuiltinType(BuiltinID, Error);
if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) {
// The type of this function differs from the type of the builtin,
// so forget about the builtin entirely.
Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents);
}
}
// If this function is declared as being extern "C", then check to see if
// the function returns a UDT (class, struct, or union type) that is not C
// compatible, and if it does, warn the user.
if (NewFD->isExternC()) {
QualType R = NewFD->getResultType();
if (R->isIncompleteType() && !R->isVoidType())
Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)
<< NewFD << R;
else if (!R.isPODType(Context) && !R->isVoidType() &&
!R->isObjCObjectPointerType())
Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R;
}
}
return Redeclaration;
}
void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
// C++11 [basic.start.main]p3: A program that declares main to be inline,
// static or constexpr is ill-formed.
// C99 6.7.4p4: In a hosted environment, the inline function specifier
// shall not appear in a declaration of main.
// static main is not an error under C99, but we should warn about it.
if (FD->getStorageClass() == SC_Static)
Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus
? diag::err_static_main : diag::warn_static_main)
<< FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
if (FD->isInlineSpecified())
Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
<< FixItHint::CreateRemoval(DS.getInlineSpecLoc());
if (FD->isConstexpr()) {
Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main)
<< FixItHint::CreateRemoval(DS.getConstexprSpecLoc());
FD->setConstexpr(false);
}
QualType T = FD->getType();
assert(T->isFunctionType() && "function decl is not of function type");
const FunctionType* FT = T->castAs<FunctionType>();
// All the standards say that main() should should return 'int'.
if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
// In C and C++, main magically returns 0 if you fall off the end;
// set the flag which tells us that.
// This is C++ [basic.start.main]p5 and C99 5.1.2.2.3.
FD->setHasImplicitReturnZero(true);
// In C with GNU extensions we allow main() to have non-integer return
// type, but we should warn about the extension, and we disable the
// implicit-return-zero rule.
} else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) {
Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint);
// Otherwise, this is just a flat-out error.
} else {
Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
FD->setInvalidDecl(true);
}
// Treat protoless main() as nullary.
if (isa<FunctionNoProtoType>(FT)) return;
const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
unsigned nparams = FTP->getNumArgs();
assert(FD->getNumParams() == nparams);
bool HasExtraParameters = (nparams > 3);
// Darwin passes an undocumented fourth argument of type char**. If
// other platforms start sprouting these, the logic below will start
// getting shifty.
if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
HasExtraParameters = false;
if (HasExtraParameters) {
Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
FD->setInvalidDecl(true);
nparams = 3;
}
// FIXME: a lot of the following diagnostics would be improved
// if we had some location information about types.
QualType CharPP =
Context.getPointerType(Context.getPointerType(Context.CharTy));
QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
for (unsigned i = 0; i < nparams; ++i) {
QualType AT = FTP->getArgType(i);
bool mismatch = true;
if (Context.hasSameUnqualifiedType(AT, Expected[i]))
mismatch = false;
else if (Expected[i] == CharPP) {
// As an extension, the following forms are okay:
// char const **
// char const * const *
// char * const *
QualifierCollector qs;
const PointerType* PT;
if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
(PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
(QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
qs.removeConst();
mismatch = !qs.empty();
}
}
if (mismatch) {
Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
// TODO: suggest replacing given type with expected type
FD->setInvalidDecl(true);
}
}
if (nparams == 1 && !FD->isInvalidDecl()) {
Diag(FD->getLocation(), diag::warn_main_one_arg);
}
if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
Diag(FD->getLocation(), diag::err_main_template_decl);
FD->setInvalidDecl();
}
}
bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
// FIXME: Need strict checking. In C89, we need to check for
// any assignment, increment, decrement, function-calls, or
// commas outside of a sizeof. In C99, it's the same list,
// except that the aforementioned are allowed in unevaluated
// expressions. Everything else falls under the
// "may accept other forms of constant expressions" exception.
// (We never end up here for C++, so the constant expression
// rules there don't matter.)
if (Init->isConstantInitializer(Context, false))
return false;
Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
<< Init->getSourceRange();
return true;
}
namespace {
// Visits an initialization expression to see if OrigDecl is evaluated in
// its own initialization and throws a warning if it does.
class SelfReferenceChecker
: public EvaluatedExprVisitor<SelfReferenceChecker> {
Sema &S;
Decl *OrigDecl;
bool isRecordType;
bool isPODType;
bool isReferenceType;
public:
typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
S(S), OrigDecl(OrigDecl) {
isPODType = false;
isRecordType = false;
isReferenceType = false;
if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
isPODType = VD->getType().isPODType(S.Context);
isRecordType = VD->getType()->isRecordType();
isReferenceType = VD->getType()->isReferenceType();
}
}
// Sometimes, the expression passed in lacks the casts that are used
// to determine which DeclRefExpr's to check. Assume that the casts
// are present and continue visiting the expression.
void HandleExpr(Expr *E) {
// Skip checking T a = a where T is not a record or reference type.
// Doing so is a way to silence uninitialized warnings.
if (isRecordType || isReferenceType)
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
HandleDeclRefExpr(DRE);
if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
HandleValue(CO->getTrueExpr());
HandleValue(CO->getFalseExpr());
}
Visit(E);
}
// For most expressions, the cast is directly above the DeclRefExpr.
// For conditional operators, the cast can be outside the conditional
// operator if both expressions are DeclRefExpr's.
void HandleValue(Expr *E) {
E = E->IgnoreParenImpCasts();
if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) {
HandleDeclRefExpr(DRE);
return;
}
if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
HandleValue(CO->getTrueExpr());
HandleValue(CO->getFalseExpr());
}
}
void VisitImplicitCastExpr(ImplicitCastExpr *E) {
if ((!isRecordType && E->getCastKind() == CK_LValueToRValue) ||
(isRecordType && E->getCastKind() == CK_NoOp))
HandleValue(E->getSubExpr());
Inherited::VisitImplicitCastExpr(E);
}
void VisitMemberExpr(MemberExpr *E) {
// Don't warn on arrays since they can be treated as pointers.
if (E->getType()->canDecayToPointerType()) return;
ValueDecl *VD = E->getMemberDecl();
CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(VD);
if (isa<FieldDecl>(VD) || (MD && !MD->isStatic()))
if (DeclRefExpr *DRE
= dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) {
HandleDeclRefExpr(DRE);
return;
}
Inherited::VisitMemberExpr(E);
}
void VisitUnaryOperator(UnaryOperator *E) {
// For POD record types, addresses of its own members are well-defined.
if (E->getOpcode() == UO_AddrOf && isRecordType && isPODType &&
isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) return;
Inherited::VisitUnaryOperator(E);
}
void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; }
void HandleDeclRefExpr(DeclRefExpr *DRE) {
Decl* ReferenceDecl = DRE->getDecl();
if (OrigDecl != ReferenceDecl) return;
unsigned diag = isReferenceType
? diag::warn_uninit_self_reference_in_reference_init
: diag::warn_uninit_self_reference_in_init;
S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
S.PDiag(diag)
<< DRE->getNameInfo().getName()
<< OrigDecl->getLocation()
<< DRE->getSourceRange());
}
};
}
/// CheckSelfReference - Warns if OrigDecl is used in expression E.
void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) {
SelfReferenceChecker(*this, OrigDecl).HandleExpr(E);
}
/// AddInitializerToDecl - Adds the initializer Init to the
/// declaration dcl. If DirectInit is true, this is C++ direct
/// initialization rather than copy initialization.
void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
bool DirectInit, bool TypeMayContainAuto) {
// If there is no declaration, there was an error parsing it. Just ignore
// the initializer.
if (RealDecl == 0 || RealDecl->isInvalidDecl())
return;
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
// With declarators parsed the way they are, the parser cannot
// distinguish between a normal initializer and a pure-specifier.
// Thus this grotesque test.
IntegerLiteral *IL;
if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
Context.getCanonicalType(IL->getType()) == Context.IntTy)
CheckPureMethod(Method, Init->getSourceRange());
else {
Diag(Method->getLocation(), diag::err_member_function_initialization)
<< Method->getDeclName() << Init->getSourceRange();
Method->setInvalidDecl();
}
return;
}
VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
if (!VDecl) {
assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
RealDecl->setInvalidDecl();
return;
}
// Check for self-references within variable initializers.
// Variables declared within a function/method body (except for references)
// are handled by a dataflow analysis.
// Record types initialized by initializer list are handled here.
// Initialization by constructors are handled in TryConstructorInitialization.
if ((!VDecl->hasLocalStorage() || VDecl->getType()->isReferenceType()) &&
(isa<InitListExpr>(Init) || !VDecl->getType()->isRecordType()))
CheckSelfReference(RealDecl, Init);
ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init);
// C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
AutoType *Auto = 0;
if (TypeMayContainAuto &&
(Auto = VDecl->getType()->getContainedAutoType()) &&
!Auto->isDeduced()) {
Expr *DeduceInit = Init;
// Initializer could be a C++ direct-initializer. Deduction only works if it
// contains exactly one expression.
if (CXXDirectInit) {
if (CXXDirectInit->getNumExprs() == 0) {
// It isn't possible to write this directly, but it is possible to
// end up in this situation with "auto x(some_pack...);"
Diag(CXXDirectInit->getLocStart(),
diag::err_auto_var_init_no_expression)
<< VDecl->getDeclName() << VDecl->getType()
<< VDecl->getSourceRange();
RealDecl->setInvalidDecl();
return;
} else if (CXXDirectInit->getNumExprs() > 1) {
Diag(CXXDirectInit->getExpr(1)->getLocStart(),
diag::err_auto_var_init_multiple_expressions)
<< VDecl->getDeclName() << VDecl->getType()
<< VDecl->getSourceRange();
RealDecl->setInvalidDecl();
return;
} else {
DeduceInit = CXXDirectInit->getExpr(0);
}
}
TypeSourceInfo *DeducedType = 0;
if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) ==
DAR_Failed)
DiagnoseAutoDeductionFailure(VDecl, DeduceInit);
if (!DeducedType) {
RealDecl->setInvalidDecl();
return;
}
VDecl->setTypeSourceInfo(DeducedType);
VDecl->setType(DeducedType->getType());
VDecl->ClearLinkageCache();
// In ARC, infer lifetime.
if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
VDecl->setInvalidDecl();
// Warn if we deduced 'id'. 'auto' usually implies type-safety, but using
// 'id' instead of a specific object type prevents most of our usual checks.
// We only want to warn outside of template instantiations, though:
// inside a template, the 'id' could have come from a parameter.
if (ActiveTemplateInstantiations.empty() &&
DeducedType->getType()->isObjCIdType()) {
SourceLocation Loc = DeducedType->getTypeLoc().getBeginLoc();
Diag(Loc, diag::warn_auto_var_is_id)
<< VDecl->getDeclName() << DeduceInit->getSourceRange();
}
// If this is a redeclaration, check that the type we just deduced matches
// the previously declared type.
if (VarDecl *Old = VDecl->getPreviousDecl())
MergeVarDeclTypes(VDecl, Old);
}
if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) {
// C99 6.7.8p5. C++ has no such restriction, but that is a defect.
Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
VDecl->setInvalidDecl();
return;
}
if (!VDecl->getType()->isDependentType()) {
// A definition must end up with a complete type, which means it must be
// complete with the restriction that an array type might be completed by
// the initializer; note that later code assumes this restriction.
QualType BaseDeclType = VDecl->getType();
if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
BaseDeclType = Array->getElementType();
if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
diag::err_typecheck_decl_incomplete_type)) {
RealDecl->setInvalidDecl();
return;
}
// The variable can not have an abstract class type.
if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
diag::err_abstract_type_in_decl,
AbstractVariableType))
VDecl->setInvalidDecl();
}
const VarDecl *Def;
if ((Def = VDecl->getDefinition()) && Def != VDecl) {
Diag(VDecl->getLocation(), diag::err_redefinition)
<< VDecl->getDeclName();
Diag(Def->getLocation(), diag::note_previous_definition);
VDecl->setInvalidDecl();
return;
}
const VarDecl* PrevInit = 0;
if (getLangOpts().CPlusPlus) {
// C++ [class.static.data]p4
// If a static data member is of const integral or const
// enumeration type, its declaration in the class definition can
// specify a constant-initializer which shall be an integral
// constant expression (5.19). In that case, the member can appear
// in integral constant expressions. The member shall still be
// defined in a namespace scope if it is used in the program and the
// namespace scope definition shall not contain an initializer.
//
// We already performed a redefinition check above, but for static
// data members we also need to check whether there was an in-class
// declaration with an initializer.
if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
Diag(VDecl->getLocation(), diag::err_redefinition)
<< VDecl->getDeclName();
Diag(PrevInit->getLocation(), diag::note_previous_definition);
return;
}
if (VDecl->hasLocalStorage())
getCurFunction()->setHasBranchProtectedScope();
if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
VDecl->setInvalidDecl();
return;
}
}
// OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
// a kernel function cannot be initialized."
if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) {
Diag(VDecl->getLocation(), diag::err_local_cant_init);
VDecl->setInvalidDecl();
return;
}
// Get the decls type and save a reference for later, since
// CheckInitializerTypes may change it.
QualType DclT = VDecl->getType(), SavT = DclT;
// Top-level message sends default to 'id' when we're in a debugger
// and we are assigning it to a variable of 'id' type.
if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType())
if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) {
ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
if (Result.isInvalid()) {
VDecl->setInvalidDecl();
return;
}
Init = Result.take();
}
// Perform the initialization.
if (!VDecl->isInvalidDecl()) {
InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
InitializationKind Kind
= DirectInit ?
CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(),
Init->getLocStart(),
Init->getLocEnd())
: InitializationKind::CreateDirectList(
VDecl->getLocation())
: InitializationKind::CreateCopy(VDecl->getLocation(),
Init->getLocStart());
Expr **Args = &Init;
unsigned NumArgs = 1;
if (CXXDirectInit) {
Args = CXXDirectInit->getExprs();
NumArgs = CXXDirectInit->getNumExprs();
}
InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs);
ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
MultiExprArg(Args, NumArgs), &DclT);
if (Result.isInvalid()) {
VDecl->setInvalidDecl();
return;
}
Init = Result.takeAs<Expr>();
}
// If the type changed, it means we had an incomplete type that was
// completed by the initializer. For example:
// int ary[] = { 1, 3, 5 };
// "ary" transitions from an IncompleteArrayType to a ConstantArrayType.
if (!VDecl->isInvalidDecl() && (DclT != SavT))
VDecl->setType(DclT);
// Check any implicit conversions within the expression.
CheckImplicitConversions(Init, VDecl->getLocation());
if (!VDecl->isInvalidDecl()) {
checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
if (VDecl->hasAttr<BlocksAttr>())
checkRetainCycles(VDecl, Init);
// It is safe to assign a weak reference into a strong variable.
// Although this code can still have problems:
// id x = self.weakProp;
// id y = self.weakProp;
// we do not warn to warn spuriously when 'x' and 'y' are on separate
// paths through the function. This should be revisited if
// -Wrepeated-use-of-weak is made flow-sensitive.
if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong) {
DiagnosticsEngine::Level Level =
Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak,
Init->getLocStart());
if (Level != DiagnosticsEngine::Ignored)
getCurFunction()->markSafeWeakUse(Init);
}
}
Init = MaybeCreateExprWithCleanups(Init);
// Attach the initializer to the decl.
VDecl->setInit(Init);
if (VDecl->isLocalVarDecl()) {
// C99 6.7.8p4: All the expressions in an initializer for an object that has
// static storage duration shall be constant expressions or string literals.
// C++ does not have this restriction.
if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() &&
VDecl->getStorageClass() == SC_Static)
CheckForConstantInitializer(Init, DclT);
} else if (VDecl->isStaticDataMember() &&
VDecl->getLexicalDeclContext()->isRecord()) {
// This is an in-class initialization for a static data member, e.g.,
//
// struct S {
// static const int value = 17;
// };
// C++ [class.mem]p4:
// A member-declarator can contain a constant-initializer only
// if it declares a static member (9.4) of const integral or
// const enumeration type, see 9.4.2.
//
// C++11 [class.static.data]p3:
// If a non-volatile const static data member is of integral or
// enumeration type, its declaration in the class definition can
// specify a brace-or-equal-initializer in which every initalizer-clause
// that is an assignment-expression is a constant expression. A static
// data member of literal type can be declared in the class definition
// with the constexpr specifier; if so, its declaration shall specify a
// brace-or-equal-initializer in which every initializer-clause that is
// an assignment-expression is a constant expression.
// Do nothing on dependent types.
if (DclT->isDependentType()) {
// Allow any 'static constexpr' members, whether or not they are of literal
// type. We separately check that every constexpr variable is of literal
// type.
} else if (VDecl->isConstexpr()) {
// Require constness.
} else if (!DclT.isConstQualified()) {
Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
<< Init->getSourceRange();
VDecl->setInvalidDecl();
// We allow integer constant expressions in all cases.
} else if (DclT->isIntegralOrEnumerationType()) {
// Check whether the expression is a constant expression.
SourceLocation Loc;
if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified())
// In C++11, a non-constexpr const static data member with an
// in-class initializer cannot be volatile.
Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
else if (Init->isValueDependent())
; // Nothing to check.
else if (Init->isIntegerConstantExpr(Context, &Loc))
; // Ok, it's an ICE!
else if (Init->isEvaluatable(Context)) {
// If we can constant fold the initializer through heroics, accept it,
// but report this as a use of an extension for -pedantic.
Diag(Loc, diag::ext_in_class_initializer_non_constant)
<< Init->getSourceRange();
} else {
// Otherwise, this is some crazy unknown case. Report the issue at the
// location provided by the isIntegerConstantExpr failed check.
Diag(Loc, diag::err_in_class_initializer_non_constant)
<< Init->getSourceRange();
VDecl->setInvalidDecl();
}
// We allow foldable floating-point constants as an extension.
} else if (DclT->isFloatingType()) { // also permits complex, which is ok
Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
<< DclT << Init->getSourceRange();
if (getLangOpts().CPlusPlus0x)
Diag(VDecl->getLocation(),
diag::note_in_class_initializer_float_type_constexpr)
<< FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) {
Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
<< Init->getSourceRange();
VDecl->setInvalidDecl();
}
// Suggest adding 'constexpr' in C++11 for literal types.
} else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) {
Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
<< DclT << Init->getSourceRange()
<< FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
VDecl->setConstexpr(true);
} else {
Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
<< DclT << Init->getSourceRange();
VDecl->setInvalidDecl();
}
} else if (VDecl->isFileVarDecl()) {
if (VDecl->getStorageClassAsWritten() == SC_Extern &&
(!getLangOpts().CPlusPlus ||
!Context.getBaseElementType(VDecl->getType()).isConstQualified()))
Diag(VDecl->getLocation(), diag::warn_extern_init);
// C99 6.7.8p4. All file scoped initializers need to be constant.
if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl())
CheckForConstantInitializer(Init, DclT);
}
// We will represent direct-initialization similarly to copy-initialization:
// int x(1); -as-> int x = 1;
// ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
//
// Clients that want to distinguish between the two forms, can check for
// direct initializer using VarDecl::getInitStyle().
// A major benefit is that clients that don't particularly care about which
// exactly form was it (like the CodeGen) can handle both cases without
// special case code.
// C++ 8.5p11:
// The form of initialization (using parentheses or '=') is generally
// insignificant, but does matter when the entity being initialized has a
// class type.
if (CXXDirectInit) {
assert(DirectInit && "Call-style initializer must be direct init.");
VDecl->setInitStyle(VarDecl::CallInit);
} else if (DirectInit) {
// This must be list-initialization. No other way is direct-initialization.
VDecl->setInitStyle(VarDecl::ListInit);
}
CheckCompleteVariableDeclaration(VDecl);
}
/// ActOnInitializerError - Given that there was an error parsing an
/// initializer for the given declaration, try to return to some form
/// of sanity.
void Sema::ActOnInitializerError(Decl *D) {
// Our main concern here is re-establishing invariants like "a
// variable's type is either dependent or complete".
if (!D || D->isInvalidDecl()) return;
VarDecl *VD = dyn_cast<VarDecl>(D);
if (!VD) return;
// Auto types are meaningless if we can't make sense of the initializer.
if (ParsingInitForAutoVars.count(D)) {
D->setInvalidDecl();
return;
}
QualType Ty = VD->getType();
if (Ty->isDependentType()) return;
// Require a complete type.
if (RequireCompleteType(VD->getLocation(),
Context.getBaseElementType(Ty),
diag::err_typecheck_decl_incomplete_type)) {
VD->setInvalidDecl();
return;
}
// Require an abstract type.
if (RequireNonAbstractType(VD->getLocation(), Ty,
diag::err_abstract_type_in_decl,
AbstractVariableType)) {
VD->setInvalidDecl();
return;
}
// Don't bother complaining about constructors or destructors,
// though.
}
void Sema::ActOnUninitializedDecl(Decl *RealDecl,
bool TypeMayContainAuto) {
// If there is no declaration, there was an error parsing it. Just ignore it.
if (RealDecl == 0)
return;
if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
QualType Type = Var->getType();
// C++11 [dcl.spec.auto]p3
if (TypeMayContainAuto && Type->getContainedAutoType()) {
Diag(Var->getLocation(), diag::err_auto_var_requires_init)
<< Var->getDeclName() << Type;
Var->setInvalidDecl();
return;
}
// C++11 [class.static.data]p3: A static data member can be declared with
// the constexpr specifier; if so, its declaration shall specify
// a brace-or-equal-initializer.
// C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to
// the definition of a variable [...] or the declaration of a static data
// member.
if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) {
if (Var->isStaticDataMember())
Diag(Var->getLocation(),
diag::err_constexpr_static_mem_var_requires_init)
<< Var->getDeclName();
else
Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl);
Var->setInvalidDecl();
return;
}
switch (Var->isThisDeclarationADefinition()) {
case VarDecl::Definition:
if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
break;
// We have an out-of-line definition of a static data member
// that has an in-class initializer, so we type-check this like
// a declaration.
//
// Fall through
case VarDecl::DeclarationOnly:
// It's only a declaration.
// Block scope. C99 6.7p7: If an identifier for an object is
// declared with no linkage (C99 6.2.2p6), the type for the
// object shall be complete.
if (!Type->isDependentType() && Var->isLocalVarDecl() &&
!Var->getLinkage() && !Var->isInvalidDecl() &&
RequireCompleteType(Var->getLocation(), Type,
diag::err_typecheck_decl_incomplete_type))
Var->setInvalidDecl();
// Make sure that the type is not abstract.
if (!Type->isDependentType() && !Var->isInvalidDecl() &&
RequireNonAbstractType(Var->getLocation(), Type,
diag::err_abstract_type_in_decl,
AbstractVariableType))
Var->setInvalidDecl();
if (!Type->isDependentType() && !Var->isInvalidDecl() &&
Var->getStorageClass() == SC_PrivateExtern) {
Diag(Var->getLocation(), diag::warn_private_extern);
Diag(Var->getLocation(), diag::note_private_extern);
}
return;
case VarDecl::TentativeDefinition:
// File scope. C99 6.9.2p2: A declaration of an identifier for an
// object that has file scope without an initializer, and without a
// storage-class specifier or with the storage-class specifier "static",
// constitutes a tentative definition. Note: A tentative definition with
// external linkage is valid (C99 6.2.2p5).
if (!Var->isInvalidDecl()) {
if (const IncompleteArrayType *ArrayT
= Context.getAsIncompleteArrayType(Type)) {
if (RequireCompleteType(Var->getLocation(),
ArrayT->getElementType(),
diag::err_illegal_decl_array_incomplete_type))
Var->setInvalidDecl();
} else if (Var->getStorageClass() == SC_Static) {
// C99 6.9.2p3: If the declaration of an identifier for an object is
// a tentative definition and has internal linkage (C99 6.2.2p3), the
// declared type shall not be an incomplete type.
// NOTE: code such as the following
// static struct s;
// struct s { int a; };
// is accepted by gcc. Hence here we issue a warning instead of
// an error and we do not invalidate the static declaration.
// NOTE: to avoid multiple warnings, only check the first declaration.
if (Var->getPreviousDecl() == 0)
RequireCompleteType(Var->getLocation(), Type,
diag::ext_typecheck_decl_incomplete_type);
}
}
// Record the tentative definition; we're done.
if (!Var->isInvalidDecl())
TentativeDefinitions.push_back(Var);
return;
}
// Provide a specific diagnostic for uninitialized variable
// definitions with incomplete array type.
if (Type->isIncompleteArrayType()) {
Diag(Var->getLocation(),
diag::err_typecheck_incomplete_array_needs_initializer);
Var->setInvalidDecl();
return;
}
// Provide a specific diagnostic for uninitialized variable
// definitions with reference type.
if (Type->isReferenceType()) {
Diag(Var->getLocation(), diag::err_reference_var_requires_init)
<< Var->getDeclName()
<< SourceRange(Var->getLocation(), Var->getLocation());
Var->setInvalidDecl();
return;
}
// Do not attempt to type-check the default initializer for a
// variable with dependent type.
if (Type->isDependentType())
return;
if (Var->isInvalidDecl())
return;
if (RequireCompleteType(Var->getLocation(),
Context.getBaseElementType(Type),
diag::err_typecheck_decl_incomplete_type)) {
Var->setInvalidDecl();
return;
}
// The variable can not have an abstract class type.
if (RequireNonAbstractType(Var->getLocation(), Type,
diag::err_abstract_type_in_decl,
AbstractVariableType)) {
Var->setInvalidDecl();
return;
}
// Check for jumps past the implicit initializer. C++0x
// clarifies that this applies to a "variable with automatic
// storage duration", not a "local variable".
// C++11 [stmt.dcl]p3
// A program that jumps from a point where a variable with automatic
// storage duration is not in scope to a point where it is in scope is
// ill-formed unless the variable has scalar type, class type with a
// trivial default constructor and a trivial destructor, a cv-qualified
// version of one of these types, or an array of one of the preceding
// types and is declared without an initializer.
if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) {
if (const RecordType *Record
= Context.getBaseElementType(Type)->getAs<RecordType>()) {
CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
// Mark the function for further checking even if the looser rules of
// C++11 do not require such checks, so that we can diagnose
// incompatibilities with C++98.
if (!CXXRecord->isPOD())
getCurFunction()->setHasBranchProtectedScope();
}
}
// C++03 [dcl.init]p9:
// If no initializer is specified for an object, and the
// object is of (possibly cv-qualified) non-POD class type (or
// array thereof), the object shall be default-initialized; if
// the object is of const-qualified type, the underlying class
// type shall have a user-declared default
// constructor. Otherwise, if no initializer is specified for
// a non- static object, the object and its subobjects, if
// any, have an indeterminate initial value); if the object
// or any of its subobjects are of const-qualified type, the
// program is ill-formed.
// C++0x [dcl.init]p11:
// If no initializer is specified for an object, the object is
// default-initialized; [...].
InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
InitializationKind Kind
= InitializationKind::CreateDefault(Var->getLocation());
InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
ExprResult Init = InitSeq.Perform(*this, Entity, Kind, MultiExprArg());
if (Init.isInvalid())
Var->setInvalidDecl();
else if (Init.get()) {
Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
// This is important for template substitution.
Var->setInitStyle(VarDecl::CallInit);
}
CheckCompleteVariableDeclaration(Var);
}
}
void Sema::ActOnCXXForRangeDecl(Decl *D) {
VarDecl *VD = dyn_cast<VarDecl>(D);
if (!VD) {
Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
D->setInvalidDecl();
return;
}
VD->setCXXForRangeDecl(true);
// for-range-declaration cannot be given a storage class specifier.
int Error = -1;
switch (VD->getStorageClassAsWritten()) {
case SC_None:
break;
case SC_Extern:
Error = 0;
break;
case SC_Static:
Error = 1;
break;
case SC_PrivateExtern:
Error = 2;
break;
case SC_Auto:
Error = 3;
break;
case SC_Register:
Error = 4;
break;
case SC_OpenCLWorkGroupLocal:
llvm_unreachable("Unexpected storage class");
}
if (VD->isConstexpr())
Error = 5;
if (Error != -1) {
Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
<< VD->getDeclName() << Error;
D->setInvalidDecl();
}
}
void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
if (var->isInvalidDecl()) return;
// In ARC, don't allow jumps past the implicit initialization of a
// local retaining variable.
if (getLangOpts().ObjCAutoRefCount &&
var->hasLocalStorage()) {
switch (var->getType().getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
case Qualifiers::OCL_Autoreleasing:
break;
case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
getCurFunction()->setHasBranchProtectedScope();
break;
}
}
// All the following checks are C++ only.
if (!getLangOpts().CPlusPlus) return;
QualType baseType = Context.getBaseElementType(var->getType());
if (baseType->isDependentType()) return;
// __block variables might require us to capture a copy-initializer.
if (var->hasAttr<BlocksAttr>()) {
// It's currently invalid to ever have a __block variable with an
// array type; should we diagnose that here?
// Regardless, we don't want to ignore array nesting when
// constructing this copy.
QualType type = var->getType();
if (type->isStructureOrClassType()) {
SourceLocation poi = var->getLocation();
Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi);
ExprResult result =
PerformCopyInitialization(
InitializedEntity::InitializeBlock(poi, type, false),
poi, Owned(varRef));
if (!result.isInvalid()) {
result = MaybeCreateExprWithCleanups(result);
Expr *init = result.takeAs<Expr>();
Context.setBlockVarCopyInits(var, init);
}
}
}
Expr *Init = var->getInit();
bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal();
if (!var->getDeclContext()->isDependentContext() && Init) {
if (IsGlobal && !var->isConstexpr() &&
getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor,
var->getLocation())
!= DiagnosticsEngine::Ignored &&
!Init->isConstantInitializer(Context, baseType->isReferenceType()))
Diag(var->getLocation(), diag::warn_global_constructor)
<< Init->getSourceRange();
if (var->isConstexpr()) {
llvm::SmallVector<PartialDiagnosticAt, 8> Notes;
if (!var->evaluateValue(Notes) || !var->isInitICE()) {
SourceLocation DiagLoc = var->getLocation();
// If the note doesn't add any useful information other than a source
// location, fold it into the primary diagnostic.
if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
diag::note_invalid_subexpr_in_const_expr) {
DiagLoc = Notes[0].first;
Notes.clear();
}
Diag(DiagLoc, diag::err_constexpr_var_requires_const_init)
<< var << Init->getSourceRange();
for (unsigned I = 0, N = Notes.size(); I != N; ++I)
Diag(Notes[I].first, Notes[I].second);
}
} else if (var->isUsableInConstantExpressions(Context)) {
// Check whether the initializer of a const variable of integral or
// enumeration type is an ICE now, since we can't tell whether it was
// initialized by a constant expression if we check later.
var->checkInitIsICE();
}
}
// Require the destructor.
if (const RecordType *recordType = baseType->getAs<RecordType>())
FinalizeVarWithDestructor(var, recordType);
}
/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
/// any semantic actions necessary after any initializer has been attached.
void
Sema::FinalizeDeclaration(Decl *ThisDecl) {
// Note that we are no longer parsing the initializer for this declaration.
ParsingInitForAutoVars.erase(ThisDecl);
// Now we have parsed the initializer and can update the table of magic
// tag values.
if (ThisDecl && ThisDecl->hasAttr<TypeTagForDatatypeAttr>()) {
const VarDecl *VD = dyn_cast<VarDecl>(ThisDecl);
if (VD && VD->getType()->isIntegralOrEnumerationType()) {
for (specific_attr_iterator<TypeTagForDatatypeAttr>
I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(),
E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>();
I != E; ++I) {
const Expr *MagicValueExpr = VD->getInit();
if (!MagicValueExpr) {
continue;
}
llvm::APSInt MagicValueInt;
if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) {
Diag(I->getRange().getBegin(),
diag::err_type_tag_for_datatype_not_ice)
<< LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
continue;
}
if (MagicValueInt.getActiveBits() > 64) {
Diag(I->getRange().getBegin(),
diag::err_type_tag_for_datatype_too_large)
<< LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
continue;
}
uint64_t MagicValue = MagicValueInt.getZExtValue();
RegisterTypeTagForDatatype(I->getArgumentKind(),
MagicValue,
I->getMatchingCType(),
I->getLayoutCompatible(),
I->getMustBeNull());
}
}
}
}
Sema::DeclGroupPtrTy
Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
Decl **Group, unsigned NumDecls) {
SmallVector<Decl*, 8> Decls;
if (DS.isTypeSpecOwned())
Decls.push_back(DS.getRepAsDecl());
for (unsigned i = 0; i != NumDecls; ++i)
if (Decl *D = Group[i])
Decls.push_back(D);
return BuildDeclaratorGroup(Decls.data(), Decls.size(),
DS.getTypeSpecType() == DeclSpec::TST_auto);
}
/// BuildDeclaratorGroup - convert a list of declarations into a declaration
/// group, performing any necessary semantic checking.
Sema::DeclGroupPtrTy
Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls,
bool TypeMayContainAuto) {
// C++0x [dcl.spec.auto]p7:
// If the type deduced for the template parameter U is not the same in each
// deduction, the program is ill-formed.
// FIXME: When initializer-list support is added, a distinction is needed
// between the deduced type U and the deduced type which 'auto' stands for.
// auto a = 0, b = { 1, 2, 3 };
// is legal because the deduced type U is 'int' in both cases.
if (TypeMayContainAuto && NumDecls > 1) {
QualType Deduced;
CanQualType DeducedCanon;
VarDecl *DeducedDecl = 0;
for (unsigned i = 0; i != NumDecls; ++i) {
if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
AutoType *AT = D->getType()->getContainedAutoType();
// Don't reissue diagnostics when instantiating a template.
if (AT && D->isInvalidDecl())
break;
if (AT && AT->isDeduced()) {
QualType U = AT->getDeducedType();
CanQualType UCanon = Context.getCanonicalType(U);
if (Deduced.isNull()) {
Deduced = U;
DeducedCanon = UCanon;
DeducedDecl = D;
} else if (DeducedCanon != UCanon) {
Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
diag::err_auto_different_deductions)
<< Deduced << DeducedDecl->getDeclName()
<< U << D->getDeclName()
<< DeducedDecl->getInit()->getSourceRange()
<< D->getInit()->getSourceRange();
D->setInvalidDecl();
break;
}
}
}
}
}
ActOnDocumentableDecls(Group, NumDecls);
return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls));
}
void Sema::ActOnDocumentableDecl(Decl *D) {
ActOnDocumentableDecls(&D, 1);
}
void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) {
// Don't parse the comment if Doxygen diagnostics are ignored.
if (NumDecls == 0 || !Group[0])
return;
if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found,
Group[0]->getLocation())
== DiagnosticsEngine::Ignored)
return;
if (NumDecls >= 2) {
// This is a decl group. Normally it will contain only declarations
// procuded from declarator list. But in case we have any definitions or
// additional declaration references:
// 'typedef struct S {} S;'
// 'typedef struct S *S;'
// 'struct S *pS;'
// FinalizeDeclaratorGroup adds these as separate declarations.
Decl *MaybeTagDecl = Group[0];
if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) {
Group++;
NumDecls--;
}
}
// See if there are any new comments that are not attached to a decl.
ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments();
if (!Comments.empty() &&
!Comments.back()->isAttached()) {
// There is at least one comment that not attached to a decl.
// Maybe it should be attached to one of these decls?
//
// Note that this way we pick up not only comments that precede the
// declaration, but also comments that *follow* the declaration -- thanks to
// the lookahead in the lexer: we've consumed the semicolon and looked
// ahead through comments.
for (unsigned i = 0; i != NumDecls; ++i)
Context.getCommentForDecl(Group[i]);
}
}
/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
/// to introduce parameters into function prototype scope.
Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
const DeclSpec &DS = D.getDeclSpec();
// Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
// C++03 [dcl.stc]p2 also permits 'auto'.
VarDecl::StorageClass StorageClass = SC_None;
VarDecl::StorageClass StorageClassAsWritten = SC_None;
if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
StorageClass = SC_Register;
StorageClassAsWritten = SC_Register;
} else if (getLangOpts().CPlusPlus &&
DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
StorageClass = SC_Auto;
StorageClassAsWritten = SC_Auto;
} else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
Diag(DS.getStorageClassSpecLoc(),
diag::err_invalid_storage_class_in_func_decl);
D.getMutableDeclSpec().ClearStorageClassSpecs();
}
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
if (D.getDeclSpec().isConstexprSpecified())
Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
<< 0;
DiagnoseFunctionSpecifiers(D);
TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType parmDeclType = TInfo->getType();
if (getLangOpts().CPlusPlus) {
// Check that there are no default arguments inside the type of this
// parameter.
CheckExtraCXXDefaultArguments(D);
// Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
if (D.getCXXScopeSpec().isSet()) {
Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
<< D.getCXXScopeSpec().getRange();
D.getCXXScopeSpec().clear();
}
}
// Ensure we have a valid name
IdentifierInfo *II = 0;
if (D.hasName()) {
II = D.getIdentifier();
if (!II) {
Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
<< GetNameForDeclarator(D).getName().getAsString();
D.setInvalidType(true);
}
}
// Check for redeclaration of parameters, e.g. int foo(int x, int x);
if (II) {
LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
ForRedeclaration);
LookupName(R, S);
if (R.isSingleResult()) {
NamedDecl *PrevDecl = R.getFoundDecl();
if (PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
// Just pretend that we didn't see the previous declaration.
PrevDecl = 0;
} else if (S->isDeclScope(PrevDecl)) {
Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
// Recover by removing the name
II = 0;
D.SetIdentifier(0, D.getIdentifierLoc());
D.setInvalidType(true);
}
}
}
// Temporarily put parameter variables in the translation unit, not
// the enclosing context. This prevents them from accidentally
// looking like class members in C++.
ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
D.getLocStart(),
D.getIdentifierLoc(), II,
parmDeclType, TInfo,
StorageClass, StorageClassAsWritten);
if (D.isInvalidType())
New->setInvalidDecl();
assert(S->isFunctionPrototypeScope());
assert(S->getFunctionPrototypeDepth() >= 1);
New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
S->getNextFunctionPrototypeIndex());
// Add the parameter declaration into this scope.
S->AddDecl(New);
if (II)
IdResolver.AddDecl(New);
ProcessDeclAttributes(S, New, D);
if (D.getDeclSpec().isModulePrivateSpecified())
Diag(New->getLocation(), diag::err_module_private_local)
<< 1 << New->getDeclName()
<< SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
<< FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
if (New->hasAttr<BlocksAttr>()) {
Diag(New->getLocation(), diag::err_block_on_nonlocal);
}
return New;
}
/// \brief Synthesizes a variable for a parameter arising from a
/// typedef.
ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
SourceLocation Loc,
QualType T) {
/* FIXME: setting StartLoc == Loc.
Would it be worth to modify callers so as to provide proper source
location for the unnamed parameters, embedding the parameter's type? */
ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0,
T, Context.getTrivialTypeSourceInfo(T, Loc),
SC_None, SC_None, 0);
Param->setImplicit();
return Param;
}
void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
ParmVarDecl * const *ParamEnd) {
// Don't diagnose unused-parameter errors in template instantiations; we
// will already have done so in the template itself.
if (!ActiveTemplateInstantiations.empty())
return;
for (; Param != ParamEnd; ++Param) {
if (!(*Param)->isReferenced() && (*Param)->getDeclName() &&
!(*Param)->hasAttr<UnusedAttr>()) {
Diag((*Param)->getLocation(), diag::warn_unused_parameter)
<< (*Param)->getDeclName();
}
}
}
void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param,
ParmVarDecl * const *ParamEnd,
QualType ReturnTy,
NamedDecl *D) {
if (LangOpts.NumLargeByValueCopy == 0) // No check.
return;
// Warn if the return value is pass-by-value and larger than the specified
// threshold.
if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) {
unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
if (Size > LangOpts.NumLargeByValueCopy)
Diag(D->getLocation(), diag::warn_return_value_size)
<< D->getDeclName() << Size;
}
// Warn if any parameter is pass-by-value and larger than the specified
// threshold.
for (; Param != ParamEnd; ++Param) {
QualType T = (*Param)->getType();
if (T->isDependentType() || !T.isPODType(Context))
continue;
unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
if (Size > LangOpts.NumLargeByValueCopy)
Diag((*Param)->getLocation(), diag::warn_parameter_size)
<< (*Param)->getDeclName() << Size;
}
}
ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
SourceLocation NameLoc, IdentifierInfo *Name,
QualType T, TypeSourceInfo *TSInfo,
VarDecl::StorageClass StorageClass,
VarDecl::StorageClass StorageClassAsWritten) {
// In ARC, infer a lifetime qualifier for appropriate parameter types.
if (getLangOpts().ObjCAutoRefCount &&
T.getObjCLifetime() == Qualifiers::OCL_None &&
T->isObjCLifetimeType()) {
Qualifiers::ObjCLifetime lifetime;
// Special cases for arrays:
// - if it's const, use __unsafe_unretained
// - otherwise, it's an error
if (T->isArrayType()) {
if (!T.isConstQualified()) {
DelayedDiagnostics.add(
sema::DelayedDiagnostic::makeForbiddenType(
NameLoc, diag::err_arc_array_param_no_ownership, T, false));
}
lifetime = Qualifiers::OCL_ExplicitNone;
} else {
lifetime = T->getObjCARCImplicitLifetime();
}
T = Context.getLifetimeQualifiedType(T, lifetime);
}
ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
Context.getAdjustedParameterType(T),
TSInfo,
StorageClass, StorageClassAsWritten,
0);
// Parameters can not be abstract class types.
// For record types, this is done by the AbstractClassUsageDiagnoser once
// the class has been completely parsed.
if (!CurContext->isRecord() &&
RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
AbstractParamType))
New->setInvalidDecl();
// Parameter declarators cannot be interface types. All ObjC objects are
// passed by reference.
if (T->isObjCObjectType()) {
SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd();
Diag(NameLoc,
diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
<< FixItHint::CreateInsertion(TypeEndLoc, "*");
T = Context.getObjCObjectPointerType(T);
New->setType(T);
}
// ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
// duration shall not be qualified by an address-space qualifier."
// Since all parameters have automatic store duration, they can not have
// an address space.
if (T.getAddressSpace() != 0) {
Diag(NameLoc, diag::err_arg_with_address_space);
New->setInvalidDecl();
}
return New;
}
void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
SourceLocation LocAfterDecls) {
DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
// Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
// for a K&R function.
if (!FTI.hasPrototype) {
for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
--i;
if (FTI.ArgInfo[i].Param == 0) {
SmallString<256> Code;
llvm::raw_svector_ostream(Code) << " int "
<< FTI.ArgInfo[i].Ident->getName()
<< ";\n";
Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
<< FTI.ArgInfo[i].Ident
<< FixItHint::CreateInsertion(LocAfterDecls, Code.str());
// Implicitly declare the argument as type 'int' for lack of a better
// type.
AttributeFactory attrs;
DeclSpec DS(attrs);
const char* PrevSpec; // unused
unsigned DiagID; // unused
DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
PrevSpec, DiagID);
Declarator ParamD(DS, Declarator::KNRTypeListContext);
ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
}
}
}
}
Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) {
assert(getCurFunctionDecl() == 0 && "Function parsing confused");
assert(D.isFunctionDeclarator() && "Not a function declarator!");
Scope *ParentScope = FnBodyScope->getParent();
D.setFunctionDefinitionKind(FDK_Definition);
Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg());
return ActOnStartOfFunctionDef(FnBodyScope, DP);
}
static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
// Don't warn about invalid declarations.
if (FD->isInvalidDecl())
return false;
// Or declarations that aren't global.
if (!FD->isGlobal())
return false;
// Don't warn about C++ member functions.
if (isa<CXXMethodDecl>(FD))
return false;
// Don't warn about 'main'.
if (FD->isMain())
return false;
// Don't warn about inline functions.
if (FD->isInlined())
return false;
// Don't warn about function templates.
if (FD->getDescribedFunctionTemplate())
return false;
// Don't warn about function template specializations.
if (FD->isFunctionTemplateSpecialization())
return false;
// Don't warn for OpenCL kernels.
if (FD->hasAttr<OpenCLKernelAttr>())
return false;
bool MissingPrototype = true;
for (const FunctionDecl *Prev = FD->getPreviousDecl();
Prev; Prev = Prev->getPreviousDecl()) {
// Ignore any declarations that occur in function or method
// scope, because they aren't visible from the header.
if (Prev->getDeclContext()->isFunctionOrMethod())
continue;
MissingPrototype = !Prev->getType()->isFunctionProtoType();
break;
}
return MissingPrototype;
}
void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) {
// Don't complain if we're in GNU89 mode and the previous definition
// was an extern inline function.
const FunctionDecl *Definition;
if (FD->isDefined(Definition) &&
!canRedefineFunction(Definition, getLangOpts())) {
if (getLangOpts().GNUMode && Definition->isInlineSpecified() &&
Definition->getStorageClass() == SC_Extern)
Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
<< FD->getDeclName() << getLangOpts().CPlusPlus;
else
Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
Diag(Definition->getLocation(), diag::note_previous_definition);
FD->setInvalidDecl();
}
}
Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
// Clear the last template instantiation error context.
LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
if (!D)
return D;
FunctionDecl *FD = 0;
if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
FD = FunTmpl->getTemplatedDecl();
else
FD = cast<FunctionDecl>(D);
// Enter a new function scope
PushFunctionScope();
// See if this is a redefinition.
if (!FD->isLateTemplateParsed())
CheckForFunctionRedefinition(FD);
// Builtin functions cannot be defined.
if (unsigned BuiltinID = FD->getBuiltinID()) {
if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
FD->setInvalidDecl();
}
}
// The return type of a function definition must be complete
// (C99 6.9.1p3, C++ [dcl.fct]p6).
QualType ResultType = FD->getResultType();
if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
!FD->isInvalidDecl() &&
RequireCompleteType(FD->getLocation(), ResultType,
diag::err_func_def_incomplete_result))
FD->setInvalidDecl();
// GNU warning -Wmissing-prototypes:
// Warn if a global function is defined without a previous
// prototype declaration. This warning is issued even if the
// definition itself provides a prototype. The aim is to detect
// global functions that fail to be declared in header files.
if (ShouldWarnAboutMissingPrototype(FD))
Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
if (FnBodyScope)
PushDeclContext(FnBodyScope, FD);
// Check the validity of our function parameters
CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(),
/*CheckParameterNames=*/true);
// Introduce our parameters into the function scope
for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
ParmVarDecl *Param = FD->getParamDecl(p);
Param->setOwningFunction(FD);
// If this has an identifier, add it to the scope stack.
if (Param->getIdentifier() && FnBodyScope) {
CheckShadow(FnBodyScope, Param);
PushOnScopeChains(Param, FnBodyScope);
}
}
// If we had any tags defined in the function prototype,
// introduce them into the function scope.
if (FnBodyScope) {
for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(),
E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) {
NamedDecl *D = *I;
// Some of these decls (like enums) may have been pinned to the translation unit
// for lack of a real context earlier. If so, remove from the translation unit
// and reattach to the current context.
if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) {
// Is the decl actually in the context?
for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(),
DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) {
if (*DI == D) {
Context.getTranslationUnitDecl()->removeDecl(D);
break;
}
}
// Either way, reassign the lexical decl context to our FunctionDecl.
D->setLexicalDeclContext(CurContext);
}
// If the decl has a non-null name, make accessible in the current scope.
if (!D->getName().empty())
PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false);
// Similarly, dive into enums and fish their constants out, making them
// accessible in this scope.
if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(),
EE = ED->enumerator_end(); EI != EE; ++EI)
PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false);
}
}
}
// Ensure that the function's exception specification is instantiated.
if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>())
ResolveExceptionSpec(D->getLocation(), FPT);
// Checking attributes of current function definition
// dllimport attribute.
DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
if (DA && (!FD->getAttr<DLLExportAttr>())) {
// dllimport attribute cannot be directly applied to definition.
// Microsoft accepts dllimport for functions defined within class scope.
if (!DA->isInherited() &&
!(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) {
Diag(FD->getLocation(),
diag::err_attribute_can_be_applied_only_to_symbol_declaration)
<< "dllimport";
FD->setInvalidDecl();
return FD;
}
// Visual C++ appears to not think this is an issue, so only issue
// a warning when Microsoft extensions are disabled.
if (!LangOpts.MicrosoftExt) {
// If a symbol previously declared dllimport is later defined, the
// attribute is ignored in subsequent references, and a warning is
// emitted.
Diag(FD->getLocation(),
diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
<< FD->getName() << "dllimport";
}
}
// We want to attach documentation to original Decl (which might be
// a function template).
ActOnDocumentableDecl(D);
return FD;
}
/// \brief Given the set of return statements within a function body,
/// compute the variables that are subject to the named return value
/// optimization.
///
/// Each of the variables that is subject to the named return value
/// optimization will be marked as NRVO variables in the AST, and any
/// return statement that has a marked NRVO variable as its NRVO candidate can
/// use the named return value optimization.
///
/// This function applies a very simplistic algorithm for NRVO: if every return
/// statement in the function has the same NRVO candidate, that candidate is
/// the NRVO variable.
///
/// FIXME: Employ a smarter algorithm that accounts for multiple return
/// statements and the lifetimes of the NRVO candidates. We should be able to
/// find a maximal set of NRVO variables.
void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
ReturnStmt **Returns = Scope->Returns.data();
const VarDecl *NRVOCandidate = 0;
for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
if (!Returns[I]->getNRVOCandidate())
return;
if (!NRVOCandidate)
NRVOCandidate = Returns[I]->getNRVOCandidate();
else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
return;
}
if (NRVOCandidate)
const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
}
Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
return ActOnFinishFunctionBody(D, BodyArg, false);
}
Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
bool IsInstantiation) {
FunctionDecl *FD = 0;
FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
if (FunTmpl)
FD = FunTmpl->getTemplatedDecl();
else
FD = dyn_cast_or_null<FunctionDecl>(dcl);
sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0;
if (FD) {
FD->setBody(Body);
// If the function implicitly returns zero (like 'main') or is naked,
// don't complain about missing return statements.
if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>())
WP.disableCheckFallThrough();
// MSVC permits the use of pure specifier (=0) on function definition,
// defined at class scope, warn about this non standard construct.
if (getLangOpts().MicrosoftExt && FD->isPure())
Diag(FD->getLocation(), diag::warn_pure_function_definition);
if (!FD->isInvalidDecl()) {
DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(),
FD->getResultType(), FD);
// If this is a constructor, we need a vtable.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
MarkVTableUsed(FD->getLocation(), Constructor->getParent());
// Try to apply the named return value optimization. We have to check
// if we can do this here because lambdas keep return statements around
// to deduce an implicit return type.
if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() &&
!FD->isDependentContext())
computeNRVO(Body, getCurFunction());
}
assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) &&
"Function parsing confused");
} else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
assert(MD == getCurMethodDecl() && "Method parsing confused");
MD->setBody(Body);
if (!MD->isInvalidDecl()) {
DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(),
MD->getResultType(), MD);
if (Body)
computeNRVO(Body, getCurFunction());
}
if (getCurFunction()->ObjCShouldCallSuperDealloc) {
Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call)
<< MD->getSelector().getAsString();
getCurFunction()->ObjCShouldCallSuperDealloc = false;
}
if (getCurFunction()->ObjCShouldCallSuperFinalize) {
Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize);
getCurFunction()->ObjCShouldCallSuperFinalize = false;
}
} else {
return 0;
}
assert(!getCurFunction()->ObjCShouldCallSuperDealloc &&
"This should only be set for ObjC methods, which should have been "
"handled in the block above.");
assert(!getCurFunction()->ObjCShouldCallSuperFinalize &&
"This should only be set for ObjC methods, which should have been "
"handled in the block above.");
// Verify and clean out per-function state.
if (Body) {
// C++ constructors that have function-try-blocks can't have return
// statements in the handlers of that block. (C++ [except.handle]p14)
// Verify this.
if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
// Verify that gotos and switch cases don't jump into scopes illegally.
if (getCurFunction()->NeedsScopeChecking() &&
!dcl->isInvalidDecl() &&
!hasAnyUnrecoverableErrorsInThisFunction() &&
!PP.isCodeCompletionEnabled())
DiagnoseInvalidJumps(Body);
if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
if (!Destructor->getParent()->isDependentType())
CheckDestructor(Destructor);
MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
Destructor->getParent());
}
// If any errors have occurred, clear out any temporaries that may have
// been leftover. This ensures that these temporaries won't be picked up for
// deletion in some later function.
if (PP.getDiagnostics().hasErrorOccurred() ||
PP.getDiagnostics().getSuppressAllDiagnostics()) {
DiscardCleanupsInEvaluationContext();
} else if (!isa<FunctionTemplateDecl>(dcl)) {
// Since the body is valid, issue any analysis-based warnings that are
// enabled.
ActivePolicy = &WP;
}
if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
(!CheckConstexprFunctionDecl(FD) ||
!CheckConstexprFunctionBody(FD, Body)))
FD->setInvalidDecl();
assert(ExprCleanupObjects.empty() && "Leftover temporaries in function");
assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
assert(MaybeODRUseExprs.empty() &&
"Leftover expressions for odr-use checking");
}
if (!IsInstantiation)
PopDeclContext();
PopFunctionScopeInfo(ActivePolicy, dcl);
// If any errors have occurred, clear out any temporaries that may have
// been leftover. This ensures that these temporaries won't be picked up for
// deletion in some later function.
if (getDiagnostics().hasErrorOccurred()) {
DiscardCleanupsInEvaluationContext();
}
return dcl;
}
/// When we finish delayed parsing of an attribute, we must attach it to the
/// relevant Decl.
void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
ParsedAttributes &Attrs) {
// Always attach attributes to the underlying decl.
if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
D = TD->getTemplatedDecl();
ProcessDeclAttributeList(S, D, Attrs.getList());
if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D))
if (Method->isStatic())
checkThisInStaticMemberFunctionAttributes(Method);
}
/// ImplicitlyDefineFunction - An undeclared identifier was used in a function
/// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
IdentifierInfo &II, Scope *S) {
// Before we produce a declaration for an implicitly defined
// function, see whether there was a locally-scoped declaration of
// this name as a function or variable. If so, use that
// (non-visible) declaration, and complain about it.
llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
= findLocallyScopedExternalDecl(&II);
if (Pos != LocallyScopedExternalDecls.end()) {
Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
Diag(Pos->second->getLocation(), diag::note_previous_declaration);
return Pos->second;
}
// Extension in C99. Legal in C90, but warn about it.
unsigned diag_id;
if (II.getName().startswith("__builtin_"))
diag_id = diag::warn_builtin_unknown;
else if (getLangOpts().C99)
diag_id = diag::ext_implicit_function_decl;
else
diag_id = diag::warn_implicit_function_decl;
Diag(Loc, diag_id) << &II;
// Because typo correction is expensive, only do it if the implicit
// function declaration is going to be treated as an error.
if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) {
TypoCorrection Corrected;
DeclFilterCCC<FunctionDecl> Validator;
if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc),
LookupOrdinaryName, S, 0, Validator))) {
std::string CorrectedStr = Corrected.getAsString(getLangOpts());
std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts());
FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>();
Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr
<< FixItHint::CreateReplacement(Loc, CorrectedStr);
if (Func->getLocation().isValid()
&& !II.getName().startswith("__builtin_"))
Diag(Func->getLocation(), diag::note_previous_decl)
<< CorrectedQuotedStr;
}
}
// Set a Declarator for the implicit definition: int foo();
const char *Dummy;
AttributeFactory attrFactory;
DeclSpec DS(attrFactory);
unsigned DiagID;
bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
(void)Error; // Silence warning.
assert(!Error && "Error setting up implicit decl!");
Declarator D(DS, Declarator::BlockContext);
D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, false,
SourceLocation(), 0, 0, 0, true,
SourceLocation(), SourceLocation(),
SourceLocation(), SourceLocation(),
EST_None, SourceLocation(),
0, 0, 0, 0, Loc, Loc, D),
DS.getAttributes(),
SourceLocation());
D.SetIdentifier(&II, Loc);
// Insert this function into translation-unit scope.
DeclContext *PrevDC = CurContext;
CurContext = Context.getTranslationUnitDecl();
FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
FD->setImplicit();
CurContext = PrevDC;
AddKnownFunctionAttributes(FD);
return FD;
}
/// \brief Adds any function attributes that we know a priori based on
/// the declaration of this function.
///
/// These attributes can apply both to implicitly-declared builtins
/// (like __builtin___printf_chk) or to library-declared functions
/// like NSLog or printf.
///
/// We need to check for duplicate attributes both here and where user-written
/// attributes are applied to declarations.
void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
if (FD->isInvalidDecl())
return;
// If this is a built-in function, map its builtin attributes to
// actual attributes.
if (unsigned BuiltinID = FD->getBuiltinID()) {
// Handle printf-formatting attributes.
unsigned FormatIdx;
bool HasVAListArg;
if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
if (!FD->getAttr<FormatAttr>()) {
const char *fmt = "printf";
unsigned int NumParams = FD->getNumParams();
if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf)
FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType())
fmt = "NSString";
FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
fmt, FormatIdx+1,
HasVAListArg ? 0 : FormatIdx+2));
}
}
if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
HasVAListArg)) {
if (!FD->getAttr<FormatAttr>())
FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
"scanf", FormatIdx+1,
HasVAListArg ? 0 : FormatIdx+2));
}
// Mark const if we don't care about errno and that is the only
// thing preventing the function from being const. This allows
// IRgen to use LLVM intrinsics for such functions.
if (!getLangOpts().MathErrno &&
Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
if (!FD->getAttr<ConstAttr>())
FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
}
if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
!FD->getAttr<ReturnsTwiceAttr>())
FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context));
if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>())
FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>())
FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
}
IdentifierInfo *Name = FD->getIdentifier();
if (!Name)
return;
if ((!getLangOpts().CPlusPlus &&
FD->getDeclContext()->isTranslationUnit()) ||
(isa<LinkageSpecDecl>(FD->getDeclContext()) &&
cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
LinkageSpecDecl::lang_c)) {
// Okay: this could be a libc/libm/Objective-C function we know
// about.
} else
return;
if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
// FIXME: asprintf and vasprintf aren't C99 functions. Should they be
// target-specific builtins, perhaps?
if (!FD->getAttr<FormatAttr>())
FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
"printf", 2,
Name->isStr("vasprintf") ? 0 : 3));
}
if (Name->isStr("__CFStringMakeConstantString")) {
// We already have a __builtin___CFStringMakeConstantString,
// but builds that use -fno-constant-cfstrings don't go through that.
if (!FD->getAttr<FormatArgAttr>())
FD->addAttr(::new (Context) FormatArgAttr(FD->getLocation(), Context, 1));
}
}
TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
TypeSourceInfo *TInfo) {
assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
if (!TInfo) {
assert(D.isInvalidType() && "no declarator info for valid type");
TInfo = Context.getTrivialTypeSourceInfo(T);
}
// Scope manipulation handled by caller.
TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
D.getLocStart(),
D.getIdentifierLoc(),
D.getIdentifier(),
TInfo);
// Bail out immediately if we have an invalid declaration.
if (D.isInvalidType()) {
NewTD->setInvalidDecl();
return NewTD;
}
if (D.getDeclSpec().isModulePrivateSpecified()) {
if (CurContext->isFunctionOrMethod())
Diag(NewTD->getLocation(), diag::err_module_private_local)
<< 2 << NewTD->getDeclName()
<< SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
<< FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
else
NewTD->setModulePrivate();
}
// C++ [dcl.typedef]p8:
// If the typedef declaration defines an unnamed class (or
// enum), the first typedef-name declared by the declaration
// to be that class type (or enum type) is used to denote the
// class type (or enum type) for linkage purposes only.
// We need to check whether the type was declared in the declaration.
switch (D.getDeclSpec().getTypeSpecType()) {
case TST_enum:
case TST_struct:
case TST_interface:
case TST_union:
case TST_class: {
TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
// Do nothing if the tag is not anonymous or already has an
// associated typedef (from an earlier typedef in this decl group).
if (tagFromDeclSpec->getIdentifier()) break;
if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break;
// A well-formed anonymous tag must always be a TUK_Definition.
assert(tagFromDeclSpec->isThisDeclarationADefinition());
// The type must match the tag exactly; no qualifiers allowed.
if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec)))
break;
// Otherwise, set this is the anon-decl typedef for the tag.
tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
break;
}
default:
break;
}
return NewTD;
}
/// \brief Check that this is a valid underlying type for an enum declaration.
bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) {
SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
QualType T = TI->getType();
if (T->isDependentType() || T->isIntegralType(Context))
return false;
Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T;
return true;
}
/// Check whether this is a valid redeclaration of a previous enumeration.
/// \return true if the redeclaration was invalid.
bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
QualType EnumUnderlyingTy,
const EnumDecl *Prev) {
bool IsFixed = !EnumUnderlyingTy.isNull();
if (IsScoped != Prev->isScoped()) {
Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch)
<< Prev->isScoped();
Diag(Prev->getLocation(), diag::note_previous_use);
return true;
}
if (IsFixed && Prev->isFixed()) {
if (!EnumUnderlyingTy->isDependentType() &&
!Prev->getIntegerType()->isDependentType() &&
!Context.hasSameUnqualifiedType(EnumUnderlyingTy,
Prev->getIntegerType())) {
Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch)
<< EnumUnderlyingTy << Prev->getIntegerType();
Diag(Prev->getLocation(), diag::note_previous_use);
return true;
}
} else if (IsFixed != Prev->isFixed()) {
Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch)
<< Prev->isFixed();
Diag(Prev->getLocation(), diag::note_previous_use);
return true;
}
return false;
}
/// \brief Get diagnostic %select index for tag kind for
/// redeclaration diagnostic message.
/// WARNING: Indexes apply to particular diagnostics only!
///
/// \returns diagnostic %select index.
static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) {
switch (Tag) {
case TTK_Struct: return 0;
case TTK_Interface: return 1;
case TTK_Class: return 2;
default: llvm_unreachable("Invalid tag kind for redecl diagnostic!");
}
}
/// \brief Determine if tag kind is a class-key compatible with
/// class for redeclaration (class, struct, or __interface).
///
/// \returns true iff the tag kind is compatible.
static bool isClassCompatTagKind(TagTypeKind Tag)
{
return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface;
}
/// \brief Determine whether a tag with a given kind is acceptable
/// as a redeclaration of the given tag declaration.
///
/// \returns true if the new tag kind is acceptable, false otherwise.
bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
TagTypeKind NewTag, bool isDefinition,
SourceLocation NewTagLoc,
const IdentifierInfo &Name) {
// C++ [dcl.type.elab]p3:
// The class-key or enum keyword present in the
// elaborated-type-specifier shall agree in kind with the
// declaration to which the name in the elaborated-type-specifier
// refers. This rule also applies to the form of
// elaborated-type-specifier that declares a class-name or
// friend class since it can be construed as referring to the
// definition of the class. Thus, in any
// elaborated-type-specifier, the enum keyword shall be used to
// refer to an enumeration (7.2), the union class-key shall be
// used to refer to a union (clause 9), and either the class or
// struct class-key shall be used to refer to a class (clause 9)
// declared using the class or struct class-key.
TagTypeKind OldTag = Previous->getTagKind();
if (!isDefinition || !isClassCompatTagKind(NewTag))
if (OldTag == NewTag)
return true;
if (isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag)) {
// Warn about the struct/class tag mismatch.
bool isTemplate = false;
if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
isTemplate = Record->getDescribedClassTemplate();
if (!ActiveTemplateInstantiations.empty()) {
// In a template instantiation, do not offer fix-its for tag mismatches
// since they usually mess up the template instead of fixing the problem.
Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
<< getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
<< getRedeclDiagFromTagKind(OldTag);
return true;
}
if (isDefinition) {
// On definitions, check previous tags and issue a fix-it for each
// one that doesn't match the current tag.
if (Previous->getDefinition()) {
// Don't suggest fix-its for redefinitions.
return true;
}
bool previousMismatch = false;
for (TagDecl::redecl_iterator I(Previous->redecls_begin()),
E(Previous->redecls_end()); I != E; ++I) {
if (I->getTagKind() != NewTag) {
if (!previousMismatch) {
previousMismatch = true;
Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
<< getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
<< getRedeclDiagFromTagKind(I->getTagKind());
}
Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
<< getRedeclDiagFromTagKind(NewTag)
<< FixItHint::CreateReplacement(I->getInnerLocStart(),
TypeWithKeyword::getTagTypeKindName(NewTag));
}
}
return true;
}
// Check for a previous definition. If current tag and definition
// are same type, do nothing. If no definition, but disagree with
// with previous tag type, give a warning, but no fix-it.
const TagDecl *Redecl = Previous->getDefinition() ?
Previous->getDefinition() : Previous;
if (Redecl->getTagKind() == NewTag) {
return true;
}
Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
<< getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
<< getRedeclDiagFromTagKind(OldTag);
Diag(Redecl->getLocation(), diag::note_previous_use);
// If there is a previous defintion, suggest a fix-it.
if (Previous->getDefinition()) {
Diag(NewTagLoc, diag::note_struct_class_suggestion)
<< getRedeclDiagFromTagKind(Redecl->getTagKind())
<< FixItHint::CreateReplacement(SourceRange(NewTagLoc),
TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind()));
}
return true;
}
return false;
}
/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
/// former case, Name will be non-null. In the later case, Name will be null.
/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
/// reference/declaration/definition of a tag.
Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
SourceLocation KWLoc, CXXScopeSpec &SS,
IdentifierInfo *Name, SourceLocation NameLoc,
AttributeList *Attr, AccessSpecifier AS,
SourceLocation ModulePrivateLoc,
MultiTemplateParamsArg TemplateParameterLists,
bool &OwnedDecl, bool &IsDependent,
SourceLocation ScopedEnumKWLoc,
bool ScopedEnumUsesClassTag,
TypeResult UnderlyingType) {
// If this is not a definition, it must have a name.
IdentifierInfo *OrigName = Name;
assert((Name != 0 || TUK == TUK_Definition) &&
"Nameless record must be a definition!");
assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
OwnedDecl = false;
TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
bool ScopedEnum = ScopedEnumKWLoc.isValid();
// FIXME: Check explicit specializations more carefully.
bool isExplicitSpecialization = false;
bool Invalid = false;
// We only need to do this matching if we have template parameters
// or a scope specifier, which also conveniently avoids this work
// for non-C++ cases.
if (TemplateParameterLists.size() > 0 ||
(SS.isNotEmpty() && TUK != TUK_Reference)) {
if (TemplateParameterList *TemplateParams
= MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS,
TemplateParameterLists.data(),
TemplateParameterLists.size(),
TUK == TUK_Friend,
isExplicitSpecialization,
Invalid)) {
if (TemplateParams->size() > 0) {
// This is a declaration or definition of a class template (which may
// be a member of another template).
if (Invalid)
return 0;
OwnedDecl = false;
DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
SS, Name, NameLoc, Attr,
TemplateParams, AS,
ModulePrivateLoc,
TemplateParameterLists.size()-1,
TemplateParameterLists.data());
return Result.get();
} else {
// The "template<>" header is extraneous.
Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
<< TypeWithKeyword::getTagTypeKindName(Kind) << Name;
isExplicitSpecialization = true;
}
}
}
// Figure out the underlying type if this a enum declaration. We need to do
// this early, because it's needed to detect if this is an incompatible
// redeclaration.
llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
if (Kind == TTK_Enum) {
if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
// No underlying type explicitly specified, or we failed to parse the
// type, default to int.
EnumUnderlying = Context.IntTy.getTypePtr();
else if (UnderlyingType.get()) {
// C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
// integral type; any cv-qualification is ignored.
TypeSourceInfo *TI = 0;
GetTypeFromParser(UnderlyingType.get(), &TI);
EnumUnderlying = TI;
if (CheckEnumUnderlyingType(TI))
// Recover by falling back to int.
EnumUnderlying = Context.IntTy.getTypePtr();
if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI,
UPPC_FixedUnderlyingType))
EnumUnderlying = Context.IntTy.getTypePtr();
} else if (getLangOpts().MicrosoftMode)
// Microsoft enums are always of int type.
EnumUnderlying = Context.IntTy.getTypePtr();
}
DeclContext *SearchDC = CurContext;
DeclContext *DC = CurContext;
bool isStdBadAlloc = false;
RedeclarationKind Redecl = ForRedeclaration;
if (TUK == TUK_Friend || TUK == TUK_Reference)
Redecl = NotForRedeclaration;
LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
if (Name && SS.isNotEmpty()) {
// We have a nested-name tag ('struct foo::bar').
// Check for invalid 'foo::'.
if (SS.isInvalid()) {
Name = 0;
goto CreateNewDecl;
}
// If this is a friend or a reference to a class in a dependent
// context, don't try to make a decl for it.
if (TUK == TUK_Friend || TUK == TUK_Reference) {
DC = computeDeclContext(SS, false);
if (!DC) {
IsDependent = true;
return 0;
}
} else {
DC = computeDeclContext(SS, true);
if (!DC) {
Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
<< SS.getRange();
return 0;
}
}
if (RequireCompleteDeclContext(SS, DC))
return 0;
SearchDC = DC;
// Look-up name inside 'foo::'.
LookupQualifiedName(Previous, DC);
if (Previous.isAmbiguous())
return 0;
if (Previous.empty()) {
// Name lookup did not find anything. However, if the
// nested-name-specifier refers to the current instantiation,
// and that current instantiation has any dependent base
// classes, we might find something at instantiation time: treat
// this as a dependent elaborated-type-specifier.
// But this only makes any sense for reference-like lookups.
if (Previous.wasNotFoundInCurrentInstantiation() &&
(TUK == TUK_Reference || TUK == TUK_Friend)) {
IsDependent = true;
return 0;
}
// A tag 'foo::bar' must already exist.
Diag(NameLoc, diag::err_not_tag_in_scope)
<< Kind << Name << DC << SS.getRange();
Name = 0;
Invalid = true;
goto CreateNewDecl;
}
} else if (Name) {
// If this is a named struct, check to see if there was a previous forward
// declaration or definition.
// FIXME: We're looking into outer scopes here, even when we
// shouldn't be. Doing so can result in ambiguities that we
// shouldn't be diagnosing.
LookupName(Previous, S);
if (Previous.isAmbiguous() &&
(TUK == TUK_Definition || TUK == TUK_Declaration)) {
LookupResult::Filter F = Previous.makeFilter();
while (F.hasNext()) {
NamedDecl *ND = F.next();
if (ND->getDeclContext()->getRedeclContext() != SearchDC)
F.erase();
}
F.done();
}
// Note: there used to be some attempt at recovery here.
if (Previous.isAmbiguous())
return 0;
if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) {
// FIXME: This makes sure that we ignore the contexts associated
// with C structs, unions, and enums when looking for a matching
// tag declaration or definition. See the similar lookup tweak
// in Sema::LookupName; is there a better way to deal with this?
while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
SearchDC = SearchDC->getParent();
}
} else if (S->isFunctionPrototypeScope()) {
// If this is an enum declaration in function prototype scope, set its
// initial context to the translation unit.
// FIXME: [citation needed]
SearchDC = Context.getTranslationUnitDecl();
}
if (Previous.isSingleResult() &&
Previous.getFoundDecl()->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
// Just pretend that we didn't see the previous declaration.
Previous.clear();
}
if (getLangOpts().CPlusPlus && Name && DC && StdNamespace &&
DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
// This is a declaration of or a reference to "std::bad_alloc".
isStdBadAlloc = true;
if (Previous.empty() && StdBadAlloc) {
// std::bad_alloc has been implicitly declared (but made invisible to
// name lookup). Fill in this implicit declaration as the previous
// declaration, so that the declarations get chained appropriately.
Previous.addDecl(getStdBadAlloc());
}
}
// If we didn't find a previous declaration, and this is a reference
// (or friend reference), move to the correct scope. In C++, we
// also need to do a redeclaration lookup there, just in case
// there's a shadow friend decl.
if (Name && Previous.empty() &&
(TUK == TUK_Reference || TUK == TUK_Friend)) {
if (Invalid) goto CreateNewDecl;
assert(SS.isEmpty());
if (TUK == TUK_Reference) {
// C++ [basic.scope.pdecl]p5:
// -- for an elaborated-type-specifier of the form
//
// class-key identifier
//
// if the elaborated-type-specifier is used in the
// decl-specifier-seq or parameter-declaration-clause of a
// function defined in namespace scope, the identifier is
// declared as a class-name in the namespace that contains
// the declaration; otherwise, except as a friend
// declaration, the identifier is declared in the smallest
// non-class, non-function-prototype scope that contains the
// declaration.
//
// C99 6.7.2.3p8 has a similar (but not identical!) provision for
// C structs and unions.
//
// It is an error in C++ to declare (rather than define) an enum
// type, including via an elaborated type specifier. We'll
// diagnose that later; for now, declare the enum in the same
// scope as we would have picked for any other tag type.
//
// GNU C also supports this behavior as part of its incomplete
// enum types extension, while GNU C++ does not.
//
// Find the context where we'll be declaring the tag.
// FIXME: We would like to maintain the current DeclContext as the
// lexical context,
while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod())
SearchDC = SearchDC->getParent();
// Find the scope where we'll be declaring the tag.
while (S->isClassScope() ||
(getLangOpts().CPlusPlus &&
S->isFunctionPrototypeScope()) ||
((S->getFlags() & Scope::DeclScope) == 0) ||
(S->getEntity() &&
((DeclContext *)S->getEntity())->isTransparentContext()))
S = S->getParent();
} else {
assert(TUK == TUK_Friend);
// C++ [namespace.memdef]p3:
// If a friend declaration in a non-local class first declares a
// class or function, the friend class or function is a member of
// the innermost enclosing namespace.
SearchDC = SearchDC->getEnclosingNamespaceContext();
}
// In C++, we need to do a redeclaration lookup to properly
// diagnose some problems.
if (getLangOpts().CPlusPlus) {
Previous.setRedeclarationKind(ForRedeclaration);
LookupQualifiedName(Previous, SearchDC);
}
}
if (!Previous.empty()) {
NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
// It's okay to have a tag decl in the same scope as a typedef
// which hides a tag decl in the same scope. Finding this
// insanity with a redeclaration lookup can only actually happen
// in C++.
//
// This is also okay for elaborated-type-specifiers, which is
// technically forbidden by the current standard but which is
// okay according to the likely resolution of an open issue;
// see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
if (getLangOpts().CPlusPlus) {
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
TagDecl *Tag = TT->getDecl();
if (Tag->getDeclName() == Name &&
Tag->getDeclContext()->getRedeclContext()
->Equals(TD->getDeclContext()->getRedeclContext())) {
PrevDecl = Tag;
Previous.clear();
Previous.addDecl(Tag);
Previous.resolveKind();
}
}
}
}
if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
// If this is a use of a previous tag, or if the tag is already declared
// in the same scope (so that the definition/declaration completes or
// rementions the tag), reuse the decl.
if (TUK == TUK_Reference || TUK == TUK_Friend ||
isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) {
// Make sure that this wasn't declared as an enum and now used as a
// struct or something similar.
if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
TUK == TUK_Definition, KWLoc,
*Name)) {
bool SafeToContinue
= (PrevTagDecl->getTagKind() != TTK_Enum &&
Kind != TTK_Enum);
if (SafeToContinue)
Diag(KWLoc, diag::err_use_with_wrong_tag)
<< Name
<< FixItHint::CreateReplacement(SourceRange(KWLoc),
PrevTagDecl->getKindName());
else
Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
if (SafeToContinue)
Kind = PrevTagDecl->getTagKind();
else {
// Recover by making this an anonymous redefinition.
Name = 0;
Previous.clear();
Invalid = true;
}
}
if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
// If this is an elaborated-type-specifier for a scoped enumeration,
// the 'class' keyword is not necessary and not permitted.
if (TUK == TUK_Reference || TUK == TUK_Friend) {
if (ScopedEnum)
Diag(ScopedEnumKWLoc, diag::err_enum_class_reference)
<< PrevEnum->isScoped()
<< FixItHint::CreateRemoval(ScopedEnumKWLoc);
return PrevTagDecl;
}
QualType EnumUnderlyingTy;
if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
EnumUnderlyingTy = TI->getType();
else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>())
EnumUnderlyingTy = QualType(T, 0);
// All conflicts with previous declarations are recovered by
// returning the previous declaration, unless this is a definition,
// in which case we want the caller to bail out.
if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc,
ScopedEnum, EnumUnderlyingTy, PrevEnum))
return TUK == TUK_Declaration ? PrevTagDecl : 0;
}
if (!Invalid) {
// If this is a use, just return the declaration we found.
// FIXME: In the future, return a variant or some other clue
// for the consumer of this Decl to know it doesn't own it.
// For our current ASTs this shouldn't be a problem, but will
// need to be changed with DeclGroups.
if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() ||
getLangOpts().MicrosoftExt)) || TUK == TUK_Friend)
return PrevTagDecl;
// Diagnose attempts to redefine a tag.
if (TUK == TUK_Definition) {
if (TagDecl *Def = PrevTagDecl->getDefinition()) {
// If we're defining a specialization and the previous definition
// is from an implicit instantiation, don't emit an error
// here; we'll catch this in the general case below.
bool IsExplicitSpecializationAfterInstantiation = false;
if (isExplicitSpecialization) {
if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def))
IsExplicitSpecializationAfterInstantiation =
RD->getTemplateSpecializationKind() !=
TSK_ExplicitSpecialization;
else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def))
IsExplicitSpecializationAfterInstantiation =
ED->getTemplateSpecializationKind() !=
TSK_ExplicitSpecialization;
}
if (!IsExplicitSpecializationAfterInstantiation) {
// A redeclaration in function prototype scope in C isn't
// visible elsewhere, so merely issue a warning.
if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope())
Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name;
else
Diag(NameLoc, diag::err_redefinition) << Name;
Diag(Def->getLocation(), diag::note_previous_definition);
// If this is a redefinition, recover by making this
// struct be anonymous, which will make any later
// references get the previous definition.
Name = 0;
Previous.clear();
Invalid = true;
}
} else {
// If the type is currently being defined, complain
// about a nested redefinition.
const TagType *Tag
= cast<TagType>(Context.getTagDeclType(PrevTagDecl));
if (Tag->isBeingDefined()) {
Diag(NameLoc, diag::err_nested_redefinition) << Name;
Diag(PrevTagDecl->getLocation(),
diag::note_previous_definition);
Name = 0;
Previous.clear();
Invalid = true;
}
}
// Okay, this is definition of a previously declared or referenced
// tag PrevDecl. We're going to create a new Decl for it.
}
}
// If we get here we have (another) forward declaration or we
// have a definition. Just create a new decl.
} else {
// If we get here, this is a definition of a new tag type in a nested
// scope, e.g. "struct foo; void bar() { struct foo; }", just create a
// new decl/type. We set PrevDecl to NULL so that the entities
// have distinct types.
Previous.clear();
}
// If we get here, we're going to create a new Decl. If PrevDecl
// is non-NULL, it's a definition of the tag declared by
// PrevDecl. If it's NULL, we have a new definition.
// Otherwise, PrevDecl is not a tag, but was found with tag
// lookup. This is only actually possible in C++, where a few
// things like templates still live in the tag namespace.
} else {
// Use a better diagnostic if an elaborated-type-specifier
// found the wrong kind of type on the first
// (non-redeclaration) lookup.
if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
!Previous.isForRedeclaration()) {
unsigned Kind = 0;
if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
Diag(PrevDecl->getLocation(), diag::note_declared_at);
Invalid = true;
// Otherwise, only diagnose if the declaration is in scope.
} else if (!isDeclInScope(PrevDecl, SearchDC, S,
isExplicitSpecialization)) {
// do nothing
// Diagnose implicit declarations introduced by elaborated types.
} else if (TUK == TUK_Reference || TUK == TUK_Friend) {
unsigned Kind = 0;
if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
Invalid = true;
// Otherwise it's a declaration. Call out a particularly common
// case here.
} else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
unsigned Kind = 0;
if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
Diag(NameLoc, diag::err_tag_definition_of_typedef)
<< Name << Kind << TND->getUnderlyingType();
Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
Invalid = true;
// Otherwise, diagnose.
} else {
// The tag name clashes with something else in the target scope,
// issue an error and recover by making this tag be anonymous.
Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Name = 0;
Invalid = true;
}
// The existing declaration isn't relevant to us; we're in a
// new scope, so clear out the previous declaration.
Previous.clear();
}
}
CreateNewDecl:
TagDecl *PrevDecl = 0;
if (Previous.isSingleResult())
PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
// If there is an identifier, use the location of the identifier as the
// location of the decl, otherwise use the location of the struct/union
// keyword.
SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
// Otherwise, create a new declaration. If there is a previous
// declaration of the same entity, the two will be linked via
// PrevDecl.
TagDecl *New;
bool IsForwardReference = false;
if (Kind == TTK_Enum) {
// FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
// enum X { A, B, C } D; D should chain to X.
New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
// If this is an undefined enum, warn.
if (TUK != TUK_Definition && !Invalid) {
TagDecl *Def;
if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) {
// C++0x: 7.2p2: opaque-enum-declaration.
// Conflicts are diagnosed above. Do nothing.
}
else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
Diag(Loc, diag::ext_forward_ref_enum_def)
<< New;
Diag(Def->getLocation(), diag::note_previous_definition);
} else {
unsigned DiagID = diag::ext_forward_ref_enum;
if (getLangOpts().MicrosoftMode)
DiagID = diag::ext_ms_forward_ref_enum;
else if (getLangOpts().CPlusPlus)
DiagID = diag::err_forward_ref_enum;
Diag(Loc, DiagID);
// If this is a forward-declared reference to an enumeration, make a
// note of it; we won't actually be introducing the declaration into
// the declaration context.
if (TUK == TUK_Reference)
IsForwardReference = true;
}
}
if (EnumUnderlying) {
EnumDecl *ED = cast<EnumDecl>(New);
if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
ED->setIntegerTypeSourceInfo(TI);
else
ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
ED->setPromotionType(ED->getIntegerType());
}
} else {
// struct/union/class
// FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
// struct X { int A; } D; D should chain to X.
if (getLangOpts().CPlusPlus) {
// FIXME: Look for a way to use RecordDecl for simple structs.
New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
cast_or_null<CXXRecordDecl>(PrevDecl));
if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
StdBadAlloc = cast<CXXRecordDecl>(New);
} else
New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
cast_or_null<RecordDecl>(PrevDecl));
}
// Maybe add qualifier info.
if (SS.isNotEmpty()) {
if (SS.isSet()) {
// If this is either a declaration or a definition, check the
// nested-name-specifier against the current context. We don't do this
// for explicit specializations, because they have similar checking
// (with more specific diagnostics) in the call to
// CheckMemberSpecialization, below.
if (!isExplicitSpecialization &&
(TUK == TUK_Definition || TUK == TUK_Declaration) &&
diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc))
Invalid = true;
New->setQualifierInfo(SS.getWithLocInContext(Context));
if (TemplateParameterLists.size() > 0) {
New->setTemplateParameterListsInfo(Context,
TemplateParameterLists.size(),
TemplateParameterLists.data());
}
}
else
Invalid = true;
}
if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
// Add alignment attributes if necessary; these attributes are checked when
// the ASTContext lays out the structure.
//
// It is important for implementing the correct semantics that this
// happen here (in act on tag decl). The #pragma pack stack is
// maintained as a result of parser callbacks which can occur at
// many points during the parsing of a struct declaration (because
// the #pragma tokens are effectively skipped over during the
// parsing of the struct).
if (TUK == TUK_Definition) {
AddAlignmentAttributesForRecord(RD);
AddMsStructLayoutForRecord(RD);
}
}
if (ModulePrivateLoc.isValid()) {
if (isExplicitSpecialization)
Diag(New->getLocation(), diag::err_module_private_specialization)
<< 2
<< FixItHint::CreateRemoval(ModulePrivateLoc);
// __module_private__ does not apply to local classes. However, we only
// diagnose this as an error when the declaration specifiers are
// freestanding. Here, we just ignore the __module_private__.
else if (!SearchDC->isFunctionOrMethod())
New->setModulePrivate();
}
// If this is a specialization of a member class (of a class template),
// check the specialization.
if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
Invalid = true;
if (Invalid)
New->setInvalidDecl();
if (Attr)
ProcessDeclAttributeList(S, New, Attr);
// If we're declaring or defining a tag in function prototype scope
// in C, note that this type can only be used within the function.
if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus)
Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
// Set the lexical context. If the tag has a C++ scope specifier, the
// lexical context will be different from the semantic context.
New->setLexicalDeclContext(CurContext);
// Mark this as a friend decl if applicable.
// In Microsoft mode, a friend declaration also acts as a forward
// declaration so we always pass true to setObjectOfFriendDecl to make
// the tag name visible.
if (TUK == TUK_Friend)
New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() ||
getLangOpts().MicrosoftExt);
// Set the access specifier.
if (!Invalid && SearchDC->isRecord())
SetMemberAccessSpecifier(New, PrevDecl, AS);
if (TUK == TUK_Definition)
New->startDefinition();
// If this has an identifier, add it to the scope stack.
if (TUK == TUK_Friend) {
// We might be replacing an existing declaration in the lookup tables;
// if so, borrow its access specifier.
if (PrevDecl)
New->setAccess(PrevDecl->getAccess());
DeclContext *DC = New->getDeclContext()->getRedeclContext();
DC->makeDeclVisibleInContext(New);
if (Name) // can be null along some error paths
if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
} else if (Name) {
S = getNonFieldDeclScope(S);
PushOnScopeChains(New, S, !IsForwardReference);
if (IsForwardReference)
SearchDC->makeDeclVisibleInContext(New);
} else {
CurContext->addDecl(New);
}
// If this is the C FILE type, notify the AST context.
if (IdentifierInfo *II = New->getIdentifier())
if (!New->isInvalidDecl() &&
New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
II->isStr("FILE"))
Context.setFILEDecl(New);
// If we were in function prototype scope (and not in C++ mode), add this
// tag to the list of decls to inject into the function definition scope.
if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus &&
InFunctionDeclarator && Name)
DeclsInPrototypeScope.push_back(New);
if (PrevDecl)
mergeDeclAttributes(New, PrevDecl);
// If there's a #pragma GCC visibility in scope, set the visibility of this
// record.
AddPushedVisibilityAttribute(New);
OwnedDecl = true;
return New;
}
void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
AdjustDeclIfTemplate(TagD);
TagDecl *Tag = cast<TagDecl>(TagD);
// Enter the tag context.
PushDeclContext(S, Tag);
ActOnDocumentableDecl(TagD);
// If there's a #pragma GCC visibility in scope, set the visibility of this
// record.
AddPushedVisibilityAttribute(Tag);
}
Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
assert(isa<ObjCContainerDecl>(IDecl) &&
"ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
DeclContext *OCD = cast<DeclContext>(IDecl);
assert(getContainingDC(OCD) == CurContext &&
"The next DeclContext should be lexically contained in the current one.");
CurContext = OCD;
return IDecl;
}
void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
SourceLocation FinalLoc,
SourceLocation LBraceLoc) {
AdjustDeclIfTemplate(TagD);
CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
FieldCollector->StartClass();
if (!Record->getIdentifier())
return;
if (FinalLoc.isValid())
Record->addAttr(new (Context) FinalAttr(FinalLoc, Context));
// C++ [class]p2:
// [...] The class-name is also inserted into the scope of the
// class itself; this is known as the injected-class-name. For
// purposes of access checking, the injected-class-name is treated
// as if it were a public member name.
CXXRecordDecl *InjectedClassName
= CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
Record->getLocStart(), Record->getLocation(),
Record->getIdentifier(),
/*PrevDecl=*/0,
/*DelayTypeCreation=*/true);
Context.getTypeDeclType(InjectedClassName, Record);
InjectedClassName->setImplicit();
InjectedClassName->setAccess(AS_public);
if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
InjectedClassName->setDescribedClassTemplate(Template);
PushOnScopeChains(InjectedClassName, S);
assert(InjectedClassName->isInjectedClassName() &&
"Broken injected-class-name");
}
void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
SourceLocation RBraceLoc) {
AdjustDeclIfTemplate(TagD);
TagDecl *Tag = cast<TagDecl>(TagD);
Tag->setRBraceLoc(RBraceLoc);
// Make sure we "complete" the definition even it is invalid.
if (Tag->isBeingDefined()) {
assert(Tag->isInvalidDecl() && "We should already have completed it");
if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
RD->completeDefinition();
}
if (isa<CXXRecordDecl>(Tag))
FieldCollector->FinishClass();
// Exit this scope of this tag's definition.
PopDeclContext();
// Notify the consumer that we've defined a tag.
Consumer.HandleTagDeclDefinition(Tag);
}
void Sema::ActOnObjCContainerFinishDefinition() {
// Exit this scope of this interface definition.
PopDeclContext();
}
void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) {
assert(DC == CurContext && "Mismatch of container contexts");
OriginalLexicalContext = DC;
ActOnObjCContainerFinishDefinition();
}
void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) {
ActOnObjCContainerStartDefinition(cast<Decl>(DC));
OriginalLexicalContext = 0;
}
void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
AdjustDeclIfTemplate(TagD);
TagDecl *Tag = cast<TagDecl>(TagD);
Tag->setInvalidDecl();
// Make sure we "complete" the definition even it is invalid.
if (Tag->isBeingDefined()) {
if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
RD->completeDefinition();
}
// We're undoing ActOnTagStartDefinition here, not
// ActOnStartCXXMemberDeclarations, so we don't have to mess with
// the FieldCollector.
PopDeclContext();
}
// Note that FieldName may be null for anonymous bitfields.
ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
IdentifierInfo *FieldName,
QualType FieldTy, Expr *BitWidth,
bool *ZeroWidth) {
// Default to true; that shouldn't confuse checks for emptiness
if (ZeroWidth)
*ZeroWidth = true;
// C99 6.7.2.1p4 - verify the field type.
// C++ 9.6p3: A bit-field shall have integral or enumeration type.
if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
// Handle incomplete types with specific error.
if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
return ExprError();
if (FieldName)
return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
<< FieldName << FieldTy << BitWidth->getSourceRange();
return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
<< FieldTy << BitWidth->getSourceRange();
} else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
UPPC_BitFieldWidth))
return ExprError();
// If the bit-width is type- or value-dependent, don't try to check
// it now.
if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
return Owned(BitWidth);
llvm::APSInt Value;
ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value);
if (ICE.isInvalid())
return ICE;
BitWidth = ICE.take();
if (Value != 0 && ZeroWidth)
*ZeroWidth = false;
// Zero-width bitfield is ok for anonymous field.
if (Value == 0 && FieldName)
return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
if (Value.isSigned() && Value.isNegative()) {
if (FieldName)
return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
<< FieldName << Value.toString(10);
return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
<< Value.toString(10);
}
if (!FieldTy->isDependentType()) {
uint64_t TypeSize = Context.getTypeSize(FieldTy);
if (Value.getZExtValue() > TypeSize) {
if (!getLangOpts().CPlusPlus) {
if (FieldName)
return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
<< FieldName << (unsigned)Value.getZExtValue()
<< (unsigned)TypeSize;
return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
<< (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
}
if (FieldName)
Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
<< FieldName << (unsigned)Value.getZExtValue()
<< (unsigned)TypeSize;
else
Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
<< (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
}
}
return Owned(BitWidth);
}
/// ActOnField - Each field of a C struct/union is passed into this in order
/// to create a FieldDecl object for it.
Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
Declarator &D, Expr *BitfieldWidth) {
FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
DeclStart, D, static_cast<Expr*>(BitfieldWidth),
/*InitStyle=*/ICIS_NoInit, AS_public);
return Res;
}
/// HandleField - Analyze a field of a C struct or a C++ data member.
///
FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
SourceLocation DeclStart,
Declarator &D, Expr *BitWidth,
InClassInitStyle InitStyle,
AccessSpecifier AS) {
IdentifierInfo *II = D.getIdentifier();
SourceLocation Loc = DeclStart;
if (II) Loc = D.getIdentifierLoc();
TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType T = TInfo->getType();
if (getLangOpts().CPlusPlus) {
CheckExtraCXXDefaultArguments(D);
if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
UPPC_DataMemberType)) {
D.setInvalidType();
T = Context.IntTy;
TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
}
}
DiagnoseFunctionSpecifiers(D);
if (D.getDeclSpec().isThreadSpecified())
Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
if (D.getDeclSpec().isConstexprSpecified())
Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
<< 2;
// Check to see if this name was declared as a member previously
NamedDecl *PrevDecl = 0;
LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
LookupName(Previous, S);
switch (Previous.getResultKind()) {
case LookupResult::Found:
case LookupResult::FoundUnresolvedValue:
PrevDecl = Previous.getAsSingle<NamedDecl>();
break;
case LookupResult::FoundOverloaded:
PrevDecl = Previous.getRepresentativeDecl();
break;
case LookupResult::NotFound:
case LookupResult::NotFoundInCurrentInstantiation:
case LookupResult::Ambiguous:
break;
}
Previous.suppressDiagnostics();
if (PrevDecl && PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
// Just pretend that we didn't see the previous declaration.
PrevDecl = 0;
}
if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
PrevDecl = 0;
bool Mutable
= (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
SourceLocation TSSL = D.getLocStart();
FieldDecl *NewFD
= CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle,
TSSL, AS, PrevDecl, &D);
if (NewFD->isInvalidDecl())
Record->setInvalidDecl();
if (D.getDeclSpec().isModulePrivateSpecified())
NewFD->setModulePrivate();
if (NewFD->isInvalidDecl() && PrevDecl) {
// Don't introduce NewFD into scope; there's already something
// with the same name in the same scope.
} else if (II) {
PushOnScopeChains(NewFD, S);
} else
Record->addDecl(NewFD);
return NewFD;
}
/// \brief Build a new FieldDecl and check its well-formedness.
///
/// This routine builds a new FieldDecl given the fields name, type,
/// record, etc. \p PrevDecl should refer to any previous declaration
/// with the same name and in the same scope as the field to be
/// created.
///
/// \returns a new FieldDecl.
///
/// \todo The Declarator argument is a hack. It will be removed once
FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
TypeSourceInfo *TInfo,
RecordDecl *Record, SourceLocation Loc,
bool Mutable, Expr *BitWidth,
InClassInitStyle InitStyle,
SourceLocation TSSL,
AccessSpecifier AS, NamedDecl *PrevDecl,
Declarator *D) {
IdentifierInfo *II = Name.getAsIdentifierInfo();
bool InvalidDecl = false;
if (D) InvalidDecl = D->isInvalidType();
// If we receive a broken type, recover by assuming 'int' and
// marking this declaration as invalid.
if (T.isNull()) {
InvalidDecl = true;
T = Context.IntTy;
}
QualType EltTy = Context.getBaseElementType(T);
if (!EltTy->isDependentType()) {
if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
// Fields of incomplete type force their record to be invalid.
Record->setInvalidDecl();
InvalidDecl = true;
} else {
NamedDecl *Def;
EltTy->isIncompleteType(&Def);
if (Def && Def->isInvalidDecl()) {
Record->setInvalidDecl();
InvalidDecl = true;
}
}
}
// C99 6.7.2.1p8: A member of a structure or union may have any type other
// than a variably modified type.
if (!InvalidDecl && T->isVariablyModifiedType()) {
bool SizeIsNegative;
llvm::APSInt Oversized;
QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
SizeIsNegative,
Oversized);
if (!FixedTy.isNull()) {
Diag(Loc, diag::warn_illegal_constant_array_size);
T = FixedTy;
} else {
if (SizeIsNegative)
Diag(Loc, diag::err_typecheck_negative_array_size);
else if (Oversized.getBoolValue())
Diag(Loc, diag::err_array_too_large)
<< Oversized.toString(10);
else
Diag(Loc, diag::err_typecheck_field_variable_size);
InvalidDecl = true;
}
}
// Fields can not have abstract class types
if (!InvalidDecl && RequireNonAbstractType(Loc, T,
diag::err_abstract_type_in_decl,
AbstractFieldType))
InvalidDecl = true;
bool ZeroWidth = false;
// If this is declared as a bit-field, check the bit-field.
if (!InvalidDecl && BitWidth) {
BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take();
if (!BitWidth) {
InvalidDecl = true;
BitWidth = 0;
ZeroWidth = false;
}
}
// Check that 'mutable' is consistent with the type of the declaration.
if (!InvalidDecl && Mutable) {
unsigned DiagID = 0;
if (T->isReferenceType())
DiagID = diag::err_mutable_reference;
else if (T.isConstQualified())
DiagID = diag::err_mutable_const;
if (DiagID) {
SourceLocation ErrLoc = Loc;
if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
Diag(ErrLoc, DiagID);
Mutable = false;
InvalidDecl = true;
}
}
FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
BitWidth, Mutable, InitStyle);
if (InvalidDecl)
NewFD->setInvalidDecl();
if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
Diag(Loc, diag::err_duplicate_member) << II;
Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
NewFD->setInvalidDecl();
}
if (!InvalidDecl && getLangOpts().CPlusPlus) {
if (Record->isUnion()) {
if (const RecordType *RT = EltTy->getAs<RecordType>()) {
CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
if (RDecl->getDefinition()) {
// C++ [class.union]p1: An object of a class with a non-trivial
// constructor, a non-trivial copy constructor, a non-trivial
// destructor, or a non-trivial copy assignment operator
// cannot be a member of a union, nor can an array of such
// objects.
if (CheckNontrivialField(NewFD))
NewFD->setInvalidDecl();
}
}
// C++ [class.union]p1: If a union contains a member of reference type,
// the program is ill-formed.
if (EltTy->isReferenceType()) {
Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type)
<< NewFD->getDeclName() << EltTy;
NewFD->setInvalidDecl();
}
}
}
// FIXME: We need to pass in the attributes given an AST
// representation, not a parser representation.
if (D)
// FIXME: What to pass instead of TUScope?
ProcessDeclAttributes(TUScope, NewFD, *D);
// In auto-retain/release, infer strong retension for fields of
// retainable type.
if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
NewFD->setInvalidDecl();
if (T.isObjCGCWeak())
Diag(Loc, diag::warn_attribute_weak_on_field);
NewFD->setAccess(AS);
return NewFD;
}
bool Sema::CheckNontrivialField(FieldDecl *FD) {
assert(FD);
assert(getLangOpts().CPlusPlus && "valid check only for C++");
if (FD->isInvalidDecl())
return true;
QualType EltTy = Context.getBaseElementType(FD->getType());
if (const RecordType *RT = EltTy->getAs<RecordType>()) {
CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
if (RDecl->getDefinition()) {
// We check for copy constructors before constructors
// because otherwise we'll never get complaints about
// copy constructors.
CXXSpecialMember member = CXXInvalid;
if (!RDecl->hasTrivialCopyConstructor())
member = CXXCopyConstructor;
else if (!RDecl->hasTrivialDefaultConstructor())
member = CXXDefaultConstructor;
else if (!RDecl->hasTrivialCopyAssignment())
member = CXXCopyAssignment;
else if (!RDecl->hasTrivialDestructor())
member = CXXDestructor;
if (member != CXXInvalid) {
if (!getLangOpts().CPlusPlus0x &&
getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) {
// Objective-C++ ARC: it is an error to have a non-trivial field of
// a union. However, system headers in Objective-C programs
// occasionally have Objective-C lifetime objects within unions,
// and rather than cause the program to fail, we make those
// members unavailable.
SourceLocation Loc = FD->getLocation();
if (getSourceManager().isInSystemHeader(Loc)) {
if (!FD->hasAttr<UnavailableAttr>())
FD->addAttr(new (Context) UnavailableAttr(Loc, Context,
"this system field has retaining ownership"));
return false;
}
}
Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ?
diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member :
diag::err_illegal_union_or_anon_struct_member)
<< (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
DiagnoseNontrivial(RT, member);
return !getLangOpts().CPlusPlus0x;
}
}
}
return false;
}
/// If the given constructor is user-declared, produce a diagnostic explaining
/// that it makes the class non-trivial.
static bool diagnoseNonTrivialUserDeclaredCtor(Sema &S, QualType QT,
CXXConstructorDecl *CD,
Sema::CXXSpecialMember CSM) {
if (CD->isImplicit())
return false;
SourceLocation CtorLoc = CD->getLocation();
S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM;
return true;
}
/// DiagnoseNontrivial - Given that a class has a non-trivial
/// special member, figure out why.
void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
QualType QT(T, 0U);
CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
// Check whether the member was user-declared.
switch (member) {
case CXXInvalid:
break;
case CXXDefaultConstructor:
if (RD->hasUserDeclaredConstructor()) {
typedef CXXRecordDecl::ctor_iterator ctor_iter;
for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI)
if (diagnoseNonTrivialUserDeclaredCtor(*this, QT, *CI, member))
return;
// No user-delcared constructors; look for constructor templates.
typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl>
tmpl_iter;
for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end());
TI != TE; ++TI) {
CXXConstructorDecl *CD =
dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl());
if (CD && diagnoseNonTrivialUserDeclaredCtor(*this, QT, CD, member))
return;
}
}
break;
case CXXCopyConstructor:
if (RD->hasUserDeclaredCopyConstructor()) {
SourceLocation CtorLoc =
RD->getCopyConstructor(0)->getLocation();
Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
case CXXMoveConstructor:
if (RD->hasUserDeclaredMoveConstructor()) {
SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation();
Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
case CXXCopyAssignment:
if (RD->hasUserDeclaredCopyAssignment()) {
SourceLocation AssignLoc =
RD->getCopyAssignmentOperator(0)->getLocation();
Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
case CXXMoveAssignment:
if (RD->hasUserDeclaredMoveAssignment()) {
SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation();
Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
case CXXDestructor:
if (RD->hasUserDeclaredDestructor()) {
SourceLocation DtorLoc = LookupDestructor(RD)->getLocation();
Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
return;
}
break;
}
typedef CXXRecordDecl::base_class_iterator base_iter;
// Virtual bases and members inhibit trivial copying/construction,
// but not trivial destruction.
if (member != CXXDestructor) {
// Check for virtual bases. vbases includes indirect virtual bases,
// so we just iterate through the direct bases.
for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
if (bi->isVirtual()) {
SourceLocation BaseLoc = bi->getLocStart();
Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
return;
}
// Check for virtual methods.
typedef CXXRecordDecl::method_iterator meth_iter;
for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
++mi) {
if (mi->isVirtual()) {
SourceLocation MLoc = mi->getLocStart();
Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
return;
}
}
}
bool (CXXRecordDecl::*hasTrivial)() const;
switch (member) {
case CXXDefaultConstructor:
hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break;
case CXXCopyConstructor:
hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
case CXXCopyAssignment:
hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
case CXXDestructor:
hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
default:
llvm_unreachable("unexpected special member");
}
// Check for nontrivial bases (and recurse).
for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
assert(BaseRT && "Don't know how to handle dependent bases");
CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
if (!(BaseRecTy->*hasTrivial)()) {
SourceLocation BaseLoc = bi->getLocStart();
Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
DiagnoseNontrivial(BaseRT, member);
return;
}
}
// Check for nontrivial members (and recurse).
typedef RecordDecl::field_iterator field_iter;
for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
++fi) {
QualType EltTy = Context.getBaseElementType(fi->getType());
if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
if (!(EltRD->*hasTrivial)()) {
SourceLocation FLoc = fi->getLocation();
Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
DiagnoseNontrivial(EltRT, member);
return;
}
}
if (EltTy->isObjCLifetimeType()) {
switch (EltTy.getObjCLifetime()) {
case Qualifiers::OCL_None:
case Qualifiers::OCL_ExplicitNone:
break;
case Qualifiers::OCL_Autoreleasing:
case Qualifiers::OCL_Weak:
case Qualifiers::OCL_Strong:
Diag(fi->getLocation(), diag::note_nontrivial_objc_ownership)
<< QT << EltTy.getObjCLifetime();
return;
}
}
}
llvm_unreachable("found no explanation for non-trivial member");
}
/// TranslateIvarVisibility - Translate visibility from a token ID to an
/// AST enum value.
static ObjCIvarDecl::AccessControl
TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
switch (ivarVisibility) {
default: llvm_unreachable("Unknown visitibility kind");
case tok::objc_private: return ObjCIvarDecl::Private;
case tok::objc_public: return ObjCIvarDecl::Public;
case tok::objc_protected: return ObjCIvarDecl::Protected;
case tok::objc_package: return ObjCIvarDecl::Package;
}
}
/// ActOnIvar - Each ivar field of an objective-c class is passed into this
/// in order to create an IvarDecl object for it.
Decl *Sema::ActOnIvar(Scope *S,
SourceLocation DeclStart,
Declarator &D, Expr *BitfieldWidth,
tok::ObjCKeywordKind Visibility) {
IdentifierInfo *II = D.getIdentifier();
Expr *BitWidth = (Expr*)BitfieldWidth;
SourceLocation Loc = DeclStart;
if (II) Loc = D.getIdentifierLoc();
// FIXME: Unnamed fields can be handled in various different ways, for
// example, unnamed unions inject all members into the struct namespace!
TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
QualType T = TInfo->getType();
if (BitWidth) {
// 6.7.2.1p3, 6.7.2.1p4
BitWidth = VerifyBitField(Loc, II, T, BitWidth).take();
if (!BitWidth)
D.setInvalidType();
} else {
// Not a bitfield.
// validate II.
}
if (T->isReferenceType()) {
Diag(Loc, diag::err_ivar_reference_type);
D.setInvalidType();
}
// C99 6.7.2.1p8: A member of a structure or union may have any type other
// than a variably modified type.
else if (T->isVariablyModifiedType()) {
Diag(Loc, diag::err_typecheck_ivar_variable_size);
D.setInvalidType();
}
// Get the visibility (access control) for this ivar.
ObjCIvarDecl::AccessControl ac =
Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
: ObjCIvarDecl::None;
// Must set ivar's DeclContext to its enclosing interface.
ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
if (!EnclosingDecl || EnclosingDecl->isInvalidDecl())
return 0;
ObjCContainerDecl *EnclosingContext;
if (ObjCImplementationDecl *IMPDecl =
dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
if (LangOpts.ObjCRuntime.isFragile()) {
// Case of ivar declared in an implementation. Context is that of its class.
EnclosingContext = IMPDecl->getClassInterface();
assert(EnclosingContext && "Implementation has no class interface!");
}
else
EnclosingContext = EnclosingDecl;
} else {
if (ObjCCategoryDecl *CDecl =
dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) {
Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
return 0;
}
}
EnclosingContext = EnclosingDecl;
}
// Construct the decl.
ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
DeclStart, Loc, II, T,
TInfo, ac, (Expr *)BitfieldWidth);
if (II) {
NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
ForRedeclaration);
if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
&& !isa<TagDecl>(PrevDecl)) {
Diag(Loc, diag::err_duplicate_member) << II;
Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
NewID->setInvalidDecl();
}
}
// Process attributes attached to the ivar.
ProcessDeclAttributes(S, NewID, D);
if (D.isInvalidType())
NewID->setInvalidDecl();
// In ARC, infer 'retaining' for ivars of retainable type.
if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
NewID->setInvalidDecl();
if (D.getDeclSpec().isModulePrivateSpecified())
NewID->setModulePrivate();
if (II) {
// FIXME: When interfaces are DeclContexts, we'll need to add
// these to the interface.
S->AddDecl(NewID);
IdResolver.AddDecl(NewID);
}
if (LangOpts.ObjCRuntime.isNonFragile() &&
!NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl))
Diag(Loc, diag::warn_ivars_in_interface);
return NewID;
}
/// ActOnLastBitfield - This routine handles synthesized bitfields rules for
/// class and class extensions. For every class @interface and class
/// extension @interface, if the last ivar is a bitfield of any type,
/// then add an implicit `char :0` ivar to the end of that interface.
void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
SmallVectorImpl<Decl *> &AllIvarDecls) {
if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty())
return;
Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
return;
ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
if (!ID) {
if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
if (!CD->IsClassExtension())
return;
}
// No need to add this to end of @implementation.
else
return;
}
// All conditions are met. Add a new bitfield to the tail end of ivars.
llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
DeclLoc, DeclLoc, 0,
Context.CharTy,
Context.getTrivialTypeSourceInfo(Context.CharTy,
DeclLoc),
ObjCIvarDecl::Private, BW,
true);
AllIvarDecls.push_back(Ivar);
}
void Sema::ActOnFields(Scope* S,
SourceLocation RecLoc, Decl *EnclosingDecl,
llvm::ArrayRef<Decl *> Fields,
SourceLocation LBrac, SourceLocation RBrac,
AttributeList *Attr) {
assert(EnclosingDecl && "missing record or interface decl");
// If this is an Objective-C @implementation or category and we have
// new fields here we should reset the layout of the interface since
// it will now change.
if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) {
ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl);
switch (DC->getKind()) {
default: break;
case Decl::ObjCCategory:
Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface());
break;
case Decl::ObjCImplementation:
Context.
ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface());
break;
}
}
RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
// Start counting up the number of named members; make sure to include
// members of anonymous structs and unions in the total.
unsigned NumNamedMembers = 0;
if (Record) {
for (RecordDecl::decl_iterator i = Record->decls_begin(),
e = Record->decls_end(); i != e; i++) {
if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i))
if (IFD->getDeclName())
++NumNamedMembers;
}
}
// Verify that all the fields are okay.
SmallVector<FieldDecl*, 32> RecFields;
bool ARCErrReported = false;
for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
i != end; ++i) {
FieldDecl *FD = cast<FieldDecl>(*i);
// Get the type for the field.
const Type *FDTy = FD->getType().getTypePtr();
if (!FD->isAnonymousStructOrUnion()) {
// Remember all fields written by the user.
RecFields.push_back(FD);
}
// If the field is already invalid for some reason, don't emit more
// diagnostics about it.
if (FD->isInvalidDecl()) {
EnclosingDecl->setInvalidDecl();
continue;
}
// C99 6.7.2.1p2:
// A structure or union shall not contain a member with
// incomplete or function type (hence, a structure shall not
// contain an instance of itself, but may contain a pointer to
// an instance of itself), except that the last member of a
// structure with more than one named member may have incomplete
// array type; such a structure (and any union containing,
// possibly recursively, a member that is such a structure)
// shall not be a member of a structure or an element of an
// array.
if (FDTy->isFunctionType()) {
// Field declared as a function.
Diag(FD->getLocation(), diag::err_field_declared_as_function)
<< FD->getDeclName();
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
} else if (FDTy->isIncompleteArrayType() && Record &&
((i + 1 == Fields.end() && !Record->isUnion()) ||
((getLangOpts().MicrosoftExt ||
getLangOpts().CPlusPlus) &&
(i + 1 == Fields.end() || Record->isUnion())))) {
// Flexible array member.
// Microsoft and g++ is more permissive regarding flexible array.
// It will accept flexible array in union and also
// as the sole element of a struct/class.
if (getLangOpts().MicrosoftExt) {
if (Record->isUnion())
Diag(FD->getLocation(), diag::ext_flexible_array_union_ms)
<< FD->getDeclName();
else if (Fields.size() == 1)
Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms)
<< FD->getDeclName() << Record->getTagKind();
} else if (getLangOpts().CPlusPlus) {
if (Record->isUnion())
Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
<< FD->getDeclName();
else if (Fields.size() == 1)
Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu)
<< FD->getDeclName() << Record->getTagKind();
} else if (!getLangOpts().C99) {
if (Record->isUnion())
Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
<< FD->getDeclName();
else
Diag(FD->getLocation(), diag::ext_c99_flexible_array_member)
<< FD->getDeclName() << Record->getTagKind();
} else if (NumNamedMembers < 1) {
Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
<< FD->getDeclName();
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
}
if (!FD->getType()->isDependentType() &&
!Context.getBaseElementType(FD->getType()).isPODType(Context)) {
Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
<< FD->getDeclName() << FD->getType();
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
}
// Okay, we have a legal flexible array member at the end of the struct.
if (Record)
Record->setHasFlexibleArrayMember(true);
} else if (!FDTy->isDependentType() &&
RequireCompleteType(FD->getLocation(), FD->getType(),
diag::err_field_incomplete)) {
// Incomplete type
FD->setInvalidDecl();
EnclosingDecl->setInvalidDecl();
continue;
} else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
// If this is a member of a union, then entire union becomes "flexible".
if (Record && Record->isUnion()) {
Record->setHasFlexibleArrayMember(true);
} else {
// If this is a struct/class and this is not the last element, reject
// it. Note that GCC supports variable sized arrays in the middle of
// structures.
if (i + 1 != Fields.end())
Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
<< FD->getDeclName() << FD->getType();
else {
// We support flexible arrays at the end of structs in
// other structs as an extension.
Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
<< FD->getDeclName();
if (Record)
Record->setHasFlexibleArrayMember(true);
}
}
}
if (isa<ObjCContainerDecl>(EnclosingDecl) &&
RequireNonAbstractType(FD->getLocation(), FD->getType(),
diag::err_abstract_type_in_decl,
AbstractIvarType)) {
// Ivars can not have abstract class types
FD->setInvalidDecl();
}
if (Record && FDTTy->getDecl()->hasObjectMember())
Record->setHasObjectMember(true);
} else if (FDTy->isObjCObjectType()) {
/// A field cannot be an Objective-c object
Diag(FD->getLocation(), diag::err_statically_allocated_object)
<< FixItHint::CreateInsertion(FD->getLocation(), "*");
QualType T = Context.getObjCObjectPointerType(FD->getType());
FD->setType(T);
} else if (!getLangOpts().CPlusPlus) {
if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) {
// It's an error in ARC if a field has lifetime.
// We don't want to report this in a system header, though,
// so we just make the field unavailable.
// FIXME: that's really not sufficient; we need to make the type
// itself invalid to, say, initialize or copy.
QualType T = FD->getType();
Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
SourceLocation loc = FD->getLocation();
if (getSourceManager().isInSystemHeader(loc)) {
if (!FD->hasAttr<UnavailableAttr>()) {
FD->addAttr(new (Context) UnavailableAttr(loc, Context,
"this system field has retaining ownership"));
}
} else {
Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct)
<< T->isBlockPointerType();
}
ARCErrReported = true;
}
}
else if (getLangOpts().ObjC1 &&
getLangOpts().getGC() != LangOptions::NonGC &&
Record && !Record->hasObjectMember()) {
if (FD->getType()->isObjCObjectPointerType() ||
FD->getType().isObjCGCStrong())
Record->setHasObjectMember(true);
else if (Context.getAsArrayType(FD->getType())) {
QualType BaseType = Context.getBaseElementType(FD->getType());
if (BaseType->isRecordType() &&
BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
Record->setHasObjectMember(true);
else if (BaseType->isObjCObjectPointerType() ||
BaseType.isObjCGCStrong())
Record->setHasObjectMember(true);
}
}
}
// Keep track of the number of named members.
if (FD->getIdentifier())
++NumNamedMembers;
}
// Okay, we successfully defined 'Record'.
if (Record) {
bool Completed = false;
if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
if (!CXXRecord->isInvalidDecl()) {
// Set access bits correctly on the directly-declared conversions.
UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions();
for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end();
I != E; ++I)
Convs->setAccess(I, (*I)->getAccess());
if (!CXXRecord->isDependentType()) {
// Adjust user-defined destructor exception spec.
if (getLangOpts().CPlusPlus0x &&
CXXRecord->hasUserDeclaredDestructor())
AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor());
// Add any implicitly-declared members to this class.
AddImplicitlyDeclaredMembersToClass(CXXRecord);
// If we have virtual base classes, we may end up finding multiple
// final overriders for a given virtual function. Check for this
// problem now.
if (CXXRecord->getNumVBases()) {
CXXFinalOverriderMap FinalOverriders;
CXXRecord->getFinalOverriders(FinalOverriders);
for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
MEnd = FinalOverriders.end();
M != MEnd; ++M) {
for (OverridingMethods::iterator SO = M->second.begin(),
SOEnd = M->second.end();
SO != SOEnd; ++SO) {
assert(SO->second.size() > 0 &&
"Virtual function without overridding functions?");
if (SO->second.size() == 1)
continue;
// C++ [class.virtual]p2:
// In a derived class, if a virtual member function of a base
// class subobject has more than one final overrider the
// program is ill-formed.
Diag(Record->getLocation(), diag::err_multiple_final_overriders)
<< (const NamedDecl *)M->first << Record;
Diag(M->first->getLocation(),
diag::note_overridden_virtual_function);
for (OverridingMethods::overriding_iterator
OM = SO->second.begin(),
OMEnd = SO->second.end();
OM != OMEnd; ++OM)
Diag(OM->Method->getLocation(), diag::note_final_overrider)
<< (const NamedDecl *)M->first << OM->Method->getParent();
Record->setInvalidDecl();
}
}
CXXRecord->completeDefinition(&FinalOverriders);
Completed = true;
}
}
}
}
if (!Completed)
Record->completeDefinition();
} else {
ObjCIvarDecl **ClsFields =
reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
ID->setEndOfDefinitionLoc(RBrac);
// Add ivar's to class's DeclContext.
for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
ClsFields[i]->setLexicalDeclContext(ID);
ID->addDecl(ClsFields[i]);
}
// Must enforce the rule that ivars in the base classes may not be
// duplicates.
if (ID->getSuperClass())
DiagnoseDuplicateIvars(ID, ID->getSuperClass());
} else if (ObjCImplementationDecl *IMPDecl =
dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
// Ivar declared in @implementation never belongs to the implementation.
// Only it is in implementation's lexical context.
ClsFields[I]->setLexicalDeclContext(IMPDecl);
CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
IMPDecl->setIvarLBraceLoc(LBrac);
IMPDecl->setIvarRBraceLoc(RBrac);
} else if (ObjCCategoryDecl *CDecl =
dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
// case of ivars in class extension; all other cases have been
// reported as errors elsewhere.
// FIXME. Class extension does not have a LocEnd field.
// CDecl->setLocEnd(RBrac);
// Add ivar's to class extension's DeclContext.
// Diagnose redeclaration of private ivars.
ObjCInterfaceDecl *IDecl = CDecl->getClassInterface();
for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
if (IDecl) {
if (const ObjCIvarDecl *ClsIvar =
IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
Diag(ClsFields[i]->getLocation(),
diag::err_duplicate_ivar_declaration);
Diag(ClsIvar->getLocation(), diag::note_previous_definition);
continue;
}
for (const ObjCCategoryDecl *ClsExtDecl =
IDecl->getFirstClassExtension();
ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) {
if (const ObjCIvarDecl *ClsExtIvar =
ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
Diag(ClsFields[i]->getLocation(),
diag::err_duplicate_ivar_declaration);
Diag(ClsExtIvar->getLocation(), diag::note_previous_definition);
continue;
}
}
}
ClsFields[i]->setLexicalDeclContext(CDecl);
CDecl->addDecl(ClsFields[i]);
}
CDecl->setIvarLBraceLoc(LBrac);
CDecl->setIvarRBraceLoc(RBrac);
}
}
if (Attr)
ProcessDeclAttributeList(S, Record, Attr);
}
/// \brief Determine whether the given integral value is representable within
/// the given type T.
static bool isRepresentableIntegerValue(ASTContext &Context,
llvm::APSInt &Value,
QualType T) {
assert(T->isIntegralType(Context) && "Integral type required!");
unsigned BitWidth = Context.getIntWidth(T);
if (Value.isUnsigned() || Value.isNonNegative()) {
if (T->isSignedIntegerOrEnumerationType())
--BitWidth;
return Value.getActiveBits() <= BitWidth;
}
return Value.getMinSignedBits() <= BitWidth;
}
// \brief Given an integral type, return the next larger integral type
// (or a NULL type of no such type exists).
static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
// FIXME: Int128/UInt128 support, which also needs to be introduced into
// enum checking below.
assert(T->isIntegralType(Context) && "Integral type required!");
const unsigned NumTypes = 4;
QualType SignedIntegralTypes[NumTypes] = {
Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
};
QualType UnsignedIntegralTypes[NumTypes] = {
Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
Context.UnsignedLongLongTy
};
unsigned BitWidth = Context.getTypeSize(T);
QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
: UnsignedIntegralTypes;
for (unsigned I = 0; I != NumTypes; ++I)
if (Context.getTypeSize(Types[I]) > BitWidth)
return Types[I];
return QualType();
}
EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
EnumConstantDecl *LastEnumConst,
SourceLocation IdLoc,
IdentifierInfo *Id,
Expr *Val) {
unsigned IntWidth = Context.getTargetInfo().getIntWidth();
llvm::APSInt EnumVal(IntWidth);
QualType EltTy;
if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
Val = 0;
if (Val)
Val = DefaultLvalueConversion(Val).take();
if (Val) {
if (Enum->isDependentType() || Val->isTypeDependent())
EltTy = Context.DependentTy;
else {
SourceLocation ExpLoc;
if (getLangOpts().CPlusPlus0x && Enum->isFixed() &&
!getLangOpts().MicrosoftMode) {
// C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the
// constant-expression in the enumerator-definition shall be a converted
// constant expression of the underlying type.
EltTy = Enum->getIntegerType();
ExprResult Converted =
CheckConvertedConstantExpression(Val, EltTy, EnumVal,
CCEK_Enumerator);
if (Converted.isInvalid())
Val = 0;
else
Val = Converted.take();
} else if (!Val->isValueDependent() &&
!(Val = VerifyIntegerConstantExpression(Val,
&EnumVal).take())) {
// C99 6.7.2.2p2: Make sure we have an integer constant expression.
} else {
if (Enum->isFixed()) {
EltTy = Enum->getIntegerType();
// In Obj-C and Microsoft mode, require the enumeration value to be
// representable in the underlying type of the enumeration. In C++11,
// we perform a non-narrowing conversion as part of converted constant
// expression checking.
if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
if (getLangOpts().MicrosoftMode) {
Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
} else
Diag(IdLoc, diag::err_enumerator_too_large) << EltTy;
} else
Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
} else if (getLangOpts().CPlusPlus) {
// C++11 [dcl.enum]p5:
// If the underlying type is not fixed, the type of each enumerator
// is the type of its initializing value:
// - If an initializer is specified for an enumerator, the
// initializing value has the same type as the expression.
EltTy = Val->getType();
} else {
// C99 6.7.2.2p2:
// The expression that defines the value of an enumeration constant
// shall be an integer constant expression that has a value
// representable as an int.
// Complain if the value is not representable in an int.
if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
Diag(IdLoc, diag::ext_enum_value_not_int)
<< EnumVal.toString(10) << Val->getSourceRange()
<< (EnumVal.isUnsigned() || EnumVal.isNonNegative());
else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
// Force the type of the expression to 'int'.
Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take();
}
EltTy = Val->getType();
}
}
}
}
if (!Val) {
if (Enum->isDependentType())
EltTy = Context.DependentTy;
else if (!LastEnumConst) {
// C++0x [dcl.enum]p5:
// If the underlying type is not fixed, the type of each enumerator
// is the type of its initializing value:
// - If no initializer is specified for the first enumerator, the
// initializing value has an unspecified integral type.
//
// GCC uses 'int' for its unspecified integral type, as does
// C99 6.7.2.2p3.
if (Enum->isFixed()) {
EltTy = Enum->getIntegerType();
}
else {
EltTy = Context.IntTy;
}
} else {
// Assign the last value + 1.
EnumVal = LastEnumConst->getInitVal();
++EnumVal;
EltTy = LastEnumConst->getType();
// Check for overflow on increment.
if (EnumVal < LastEnumConst->getInitVal()) {
// C++0x [dcl.enum]p5:
// If the underlying type is not fixed, the type of each enumerator
// is the type of its initializing value:
//
// - Otherwise the type of the initializing value is the same as
// the type of the initializing value of the preceding enumerator
// unless the incremented value is not representable in that type,
// in which case the type is an unspecified integral type
// sufficient to contain the incremented value. If no such type
// exists, the program is ill-formed.
QualType T = getNextLargerIntegralType(Context, EltTy);
if (T.isNull() || Enum->isFixed()) {
// There is no integral type larger enough to represent this
// value. Complain, then allow the value to wrap around.
EnumVal = LastEnumConst->getInitVal();
EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
++EnumVal;
if (Enum->isFixed())
// When the underlying type is fixed, this is ill-formed.
Diag(IdLoc, diag::err_enumerator_wrapped)
<< EnumVal.toString(10)
<< EltTy;
else
Diag(IdLoc, diag::warn_enumerator_too_large)
<< EnumVal.toString(10);
} else {
EltTy = T;
}
// Retrieve the last enumerator's value, extent that type to the
// type that is supposed to be large enough to represent the incremented
// value, then increment.
EnumVal = LastEnumConst->getInitVal();
EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
++EnumVal;
// If we're not in C++, diagnose the overflow of enumerator values,
// which in C99 means that the enumerator value is not representable in
// an int (C99 6.7.2.2p2). However, we support GCC's extension that
// permits enumerator values that are representable in some larger
// integral type.
if (!getLangOpts().CPlusPlus && !T.isNull())
Diag(IdLoc, diag::warn_enum_value_overflow);
} else if (!getLangOpts().CPlusPlus &&
!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
// Enforce C99 6.7.2.2p2 even when we compute the next value.
Diag(IdLoc, diag::ext_enum_value_not_int)
<< EnumVal.toString(10) << 1;
}
}
}
if (!EltTy->isDependentType()) {
// Make the enumerator value match the signedness and size of the
// enumerator's type.
EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy));
EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
}
return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
Val, EnumVal);
}
Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
SourceLocation IdLoc, IdentifierInfo *Id,
AttributeList *Attr,
SourceLocation EqualLoc, Expr *Val) {
EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
EnumConstantDecl *LastEnumConst =
cast_or_null<EnumConstantDecl>(lastEnumConst);
// The scope passed in may not be a decl scope. Zip up the scope tree until
// we find one that is.
S = getNonFieldDeclScope(S);
// Verify that there isn't already something declared with this name in this
// scope.
NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
ForRedeclaration);
if (PrevDecl && PrevDecl->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
// Just pretend that we didn't see the previous declaration.
PrevDecl = 0;
}
if (PrevDecl) {
// When in C++, we may get a TagDecl with the same name; in this case the
// enum constant will 'hide' the tag.
assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
"Received TagDecl when not in C++!");
if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
if (isa<EnumConstantDecl>(PrevDecl))
Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
else
Diag(IdLoc, diag::err_redefinition) << Id;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
return 0;
}
}
// C++ [class.mem]p15:
// If T is the name of a class, then each of the following shall have a name
// different from T:
// - every enumerator of every member of class T that is an unscoped
// enumerated type
if (CXXRecordDecl *Record
= dyn_cast<CXXRecordDecl>(
TheEnumDecl->getDeclContext()->getRedeclContext()))
if (!TheEnumDecl->isScoped() &&
Record->getIdentifier() && Record->getIdentifier() == Id)
Diag(IdLoc, diag::err_member_name_of_class) << Id;
EnumConstantDecl *New =
CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
if (New) {
// Process attributes.
if (Attr) ProcessDeclAttributeList(S, New, Attr);
// Register this decl in the current scope stack.
New->setAccess(TheEnumDecl->getAccess());
PushOnScopeChains(New, S);
}
ActOnDocumentableDecl(New);
return New;
}
void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
SourceLocation RBraceLoc, Decl *EnumDeclX,
Decl **Elements, unsigned NumElements,
Scope *S, AttributeList *Attr) {
EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
QualType EnumType = Context.getTypeDeclType(Enum);
if (Attr)
ProcessDeclAttributeList(S, Enum, Attr);
if (Enum->isDependentType()) {
for (unsigned i = 0; i != NumElements; ++i) {
EnumConstantDecl *ECD =
cast_or_null<EnumConstantDecl>(Elements[i]);
if (!ECD) continue;
ECD->setType(EnumType);
}
Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
return;
}
// TODO: If the result value doesn't fit in an int, it must be a long or long
// long value. ISO C does not support this, but GCC does as an extension,
// emit a warning.
unsigned IntWidth = Context.getTargetInfo().getIntWidth();
unsigned CharWidth = Context.getTargetInfo().getCharWidth();
unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
// Verify that all the values are okay, compute the size of the values, and
// reverse the list.
unsigned NumNegativeBits = 0;
unsigned NumPositiveBits = 0;
// Keep track of whether all elements have type int.
bool AllElementsInt = true;
for (unsigned i = 0; i != NumElements; ++i) {
EnumConstantDecl *ECD =
cast_or_null<EnumConstantDecl>(Elements[i]);
if (!ECD) continue; // Already issued a diagnostic.
const llvm::APSInt &InitVal = ECD->getInitVal();
// Keep track of the size of positive and negative values.
if (InitVal.isUnsigned() || InitVal.isNonNegative())
NumPositiveBits = std::max(NumPositiveBits,
(unsigned)InitVal.getActiveBits());
else
NumNegativeBits = std::max(NumNegativeBits,
(unsigned)InitVal.getMinSignedBits());
// Keep track of whether every enum element has type int (very commmon).
if (AllElementsInt)
AllElementsInt = ECD->getType() == Context.IntTy;
}
// Figure out the type that should be used for this enum.
QualType BestType;
unsigned BestWidth;
// C++0x N3000 [conv.prom]p3:
// An rvalue of an unscoped enumeration type whose underlying
// type is not fixed can be converted to an rvalue of the first
// of the following types that can represent all the values of
// the enumeration: int, unsigned int, long int, unsigned long
// int, long long int, or unsigned long long int.
// C99 6.4.4.3p2:
// An identifier declared as an enumeration constant has type int.
// The C99 rule is modified by a gcc extension
QualType BestPromotionType;
bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
// -fshort-enums is the equivalent to specifying the packed attribute on all
// enum definitions.
if (LangOpts.ShortEnums)
Packed = true;
if (Enum->isFixed()) {
BestType = Enum->getIntegerType();
if (BestType->isPromotableIntegerType())
BestPromotionType = Context.getPromotedIntegerType(BestType);
else
BestPromotionType = BestType;
// We don't need to set BestWidth, because BestType is going to be the type
// of the enumerators, but we do anyway because otherwise some compilers
// warn that it might be used uninitialized.
BestWidth = CharWidth;
}
else if (NumNegativeBits) {
// If there is a negative value, figure out the smallest integer type (of
// int/long/longlong) that fits.
// If it's packed, check also if it fits a char or a short.
if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
BestType = Context.SignedCharTy;
BestWidth = CharWidth;
} else if (Packed && NumNegativeBits <= ShortWidth &&
NumPositiveBits < ShortWidth) {
BestType = Context.ShortTy;
BestWidth = ShortWidth;
} else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
BestType = Context.IntTy;
BestWidth = IntWidth;
} else {
BestWidth = Context.getTargetInfo().getLongWidth();
if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
BestType = Context.LongTy;
} else {
BestWidth = Context.getTargetInfo().getLongLongWidth();
if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
Diag(Enum->getLocation(), diag::warn_enum_too_large);
BestType = Context.LongLongTy;
}
}
BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
} else {
// If there is no negative value, figure out the smallest type that fits
// all of the enumerator values.
// If it's packed, check also if it fits a char or a short.
if (Packed && NumPositiveBits <= CharWidth) {
BestType = Context.UnsignedCharTy;
BestPromotionType = Context.IntTy;
BestWidth = CharWidth;
} else if (Packed && NumPositiveBits <= ShortWidth) {
BestType = Context.UnsignedShortTy;
BestPromotionType = Context.IntTy;
BestWidth = ShortWidth;
} else if (NumPositiveBits <= IntWidth) {
BestType = Context.UnsignedIntTy;
BestWidth = IntWidth;
BestPromotionType
= (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
? Context.UnsignedIntTy : Context.IntTy;
} else if (NumPositiveBits <=
(BestWidth = Context.getTargetInfo().getLongWidth())) {
BestType = Context.UnsignedLongTy;
BestPromotionType
= (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
? Context.UnsignedLongTy : Context.LongTy;
} else {
BestWidth = Context.getTargetInfo().getLongLongWidth();
assert(NumPositiveBits <= BestWidth &&
"How could an initializer get larger than ULL?");
BestType = Context.UnsignedLongLongTy;
BestPromotionType
= (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
? Context.UnsignedLongLongTy : Context.LongLongTy;
}
}
// Loop over all of the enumerator constants, changing their types to match
// the type of the enum if needed.
for (unsigned i = 0; i != NumElements; ++i) {
EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
if (!ECD) continue; // Already issued a diagnostic.
// Standard C says the enumerators have int type, but we allow, as an
// extension, the enumerators to be larger than int size. If each
// enumerator value fits in an int, type it as an int, otherwise type it the
// same as the enumerator decl itself. This means that in "enum { X = 1U }"
// that X has type 'int', not 'unsigned'.
// Determine whether the value fits into an int.
llvm::APSInt InitVal = ECD->getInitVal();
// If it fits into an integer type, force it. Otherwise force it to match
// the enum decl type.
QualType NewTy;
unsigned NewWidth;
bool NewSign;
if (!getLangOpts().CPlusPlus &&
!Enum->isFixed() &&
isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
NewTy = Context.IntTy;
NewWidth = IntWidth;
NewSign = true;
} else if (ECD->getType() == BestType) {
// Already the right type!
if (getLangOpts().CPlusPlus)
// C++ [dcl.enum]p4: Following the closing brace of an
// enum-specifier, each enumerator has the type of its
// enumeration.
ECD->setType(EnumType);
continue;
} else {
NewTy = BestType;
NewWidth = BestWidth;
NewSign = BestType->isSignedIntegerOrEnumerationType();
}
// Adjust the APSInt value.
InitVal = InitVal.extOrTrunc(NewWidth);
InitVal.setIsSigned(NewSign);
ECD->setInitVal(InitVal);
// Adjust the Expr initializer and type.
if (ECD->getInitExpr() &&
!Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
CK_IntegralCast,
ECD->getInitExpr(),
/*base paths*/ 0,
VK_RValue));
if (getLangOpts().CPlusPlus)
// C++ [dcl.enum]p4: Following the closing brace of an
// enum-specifier, each enumerator has the type of its
// enumeration.
ECD->setType(EnumType);
else
ECD->setType(NewTy);
}
Enum->completeDefinition(BestType, BestPromotionType,
NumPositiveBits, NumNegativeBits);
// If we're declaring a function, ensure this decl isn't forgotten about -
// it needs to go into the function scope.
if (InFunctionDeclarator)
DeclsInPrototypeScope.push_back(Enum);
}
Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
SourceLocation StartLoc,
SourceLocation EndLoc) {
StringLiteral *AsmString = cast<StringLiteral>(expr);
FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
AsmString, StartLoc,
EndLoc);
CurContext->addDecl(New);
return New;
}
DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc,
SourceLocation ImportLoc,
ModuleIdPath Path) {
Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path,
Module::AllVisible,
/*IsIncludeDirective=*/false);
if (!Mod)
return true;
llvm::SmallVector<SourceLocation, 2> IdentifierLocs;
Module *ModCheck = Mod;
for (unsigned I = 0, N = Path.size(); I != N; ++I) {
// If we've run out of module parents, just drop the remaining identifiers.
// We need the length to be consistent.
if (!ModCheck)
break;
ModCheck = ModCheck->Parent;
IdentifierLocs.push_back(Path[I].second);
}
ImportDecl *Import = ImportDecl::Create(Context,
Context.getTranslationUnitDecl(),
AtLoc.isValid()? AtLoc : ImportLoc,
Mod, IdentifierLocs);
Context.getTranslationUnitDecl()->addDecl(Import);
return Import;
}
void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
IdentifierInfo* AliasName,
SourceLocation PragmaLoc,
SourceLocation NameLoc,
SourceLocation AliasNameLoc) {
Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
LookupOrdinaryName);
AsmLabelAttr *Attr =
::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName());
if (PrevDecl)
PrevDecl->addAttr(Attr);
else
(void)ExtnameUndeclaredIdentifiers.insert(
std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr));
}
void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
SourceLocation PragmaLoc,
SourceLocation NameLoc) {
Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
if (PrevDecl) {
PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
} else {
(void)WeakUndeclaredIdentifiers.insert(
std::pair<IdentifierInfo*,WeakInfo>
(Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
}
}
void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
IdentifierInfo* AliasName,
SourceLocation PragmaLoc,
SourceLocation NameLoc,
SourceLocation AliasNameLoc) {
Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
LookupOrdinaryName);
WeakInfo W = WeakInfo(Name, NameLoc);
if (PrevDecl) {
if (!PrevDecl->hasAttr<AliasAttr>())
if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
DeclApplyPragmaWeak(TUScope, ND, W);
} else {
(void)WeakUndeclaredIdentifiers.insert(
std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
}
}
Decl *Sema::getObjCDeclContext() const {
return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));
}
AvailabilityResult Sema::getCurContextAvailability() const {
const Decl *D = cast<Decl>(getCurObjCLexicalContext());
return D->getAvailability();
}
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