1 //===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "TypeLocBuilder.h"
16 #include "clang/AST/ASTConsumer.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/ASTLambda.h"
19 #include "clang/AST/CXXInheritance.h"
20 #include "clang/AST/CharUnits.h"
21 #include "clang/AST/CommentDiagnostic.h"
22 #include "clang/AST/DeclCXX.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclTemplate.h"
25 #include "clang/AST/EvaluatedExprVisitor.h"
26 #include "clang/AST/ExprCXX.h"
27 #include "clang/AST/StmtCXX.h"
28 #include "clang/Basic/Builtins.h"
29 #include "clang/Basic/PartialDiagnostic.h"
30 #include "clang/Basic/SourceManager.h"
31 #include "clang/Basic/TargetInfo.h"
32 #include "clang/Lex/HeaderSearch.h" // TODO: Sema shouldn't depend on Lex
33 #include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
34 #include "clang/Lex/ModuleLoader.h" // TODO: Sema shouldn't depend on Lex
35 #include "clang/Lex/Preprocessor.h" // Included for isCodeCompletionEnabled()
36 #include "clang/Parse/ParseDiagnostic.h"
37 #include "clang/Sema/CXXFieldCollector.h"
38 #include "clang/Sema/DeclSpec.h"
39 #include "clang/Sema/DelayedDiagnostic.h"
40 #include "clang/Sema/Initialization.h"
41 #include "clang/Sema/Lookup.h"
42 #include "clang/Sema/ParsedTemplate.h"
43 #include "clang/Sema/Scope.h"
44 #include "clang/Sema/ScopeInfo.h"
45 #include "clang/Sema/Template.h"
46 #include "llvm/ADT/SmallString.h"
47 #include "llvm/ADT/Triple.h"
51 using namespace clang;
54 Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) {
56 Decl *Group[2] = { OwnedType, Ptr };
57 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2));
60 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
65 class TypeNameValidatorCCC : public CorrectionCandidateCallback {
67 TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false,
68 bool AllowTemplates=false)
69 : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass),
70 AllowClassTemplates(AllowTemplates) {
71 WantExpressionKeywords = false;
72 WantCXXNamedCasts = false;
73 WantRemainingKeywords = false;
76 bool ValidateCandidate(const TypoCorrection &candidate) override {
77 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
78 bool IsType = isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND);
79 bool AllowedTemplate = AllowClassTemplates && isa<ClassTemplateDecl>(ND);
80 return (IsType || AllowedTemplate) &&
81 (AllowInvalidDecl || !ND->isInvalidDecl());
83 return !WantClassName && candidate.isKeyword();
87 bool AllowInvalidDecl;
89 bool AllowClassTemplates;
94 /// \brief Determine whether the token kind starts a simple-type-specifier.
95 bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const {
97 // FIXME: Take into account the current language when deciding whether a
98 // token kind is a valid type specifier
101 case tok::kw___int64:
102 case tok::kw___int128:
104 case tok::kw_unsigned:
111 case tok::kw_wchar_t:
113 case tok::kw___underlying_type:
116 case tok::annot_typename:
117 case tok::kw_char16_t:
118 case tok::kw_char32_t:
120 case tok::annot_decltype:
121 case tok::kw_decltype:
122 return getLangOpts().CPlusPlus;
131 static ParsedType recoverFromTypeInKnownDependentBase(Sema &S,
132 const IdentifierInfo &II,
133 SourceLocation NameLoc) {
134 // Find the first parent class template context, if any.
135 // FIXME: Perform the lookup in all enclosing class templates.
136 const CXXRecordDecl *RD = nullptr;
137 for (DeclContext *DC = S.CurContext; DC; DC = DC->getParent()) {
138 RD = dyn_cast<CXXRecordDecl>(DC);
139 if (RD && RD->getDescribedClassTemplate())
145 // Look for type decls in dependent base classes that have known primary
147 bool FoundTypeDecl = false;
148 for (const auto &Base : RD->bases()) {
149 auto *TST = Base.getType()->getAs<TemplateSpecializationType>();
150 if (!TST || !TST->isDependentType())
152 auto *TD = TST->getTemplateName().getAsTemplateDecl();
155 auto *BasePrimaryTemplate = cast<CXXRecordDecl>(TD->getTemplatedDecl());
156 // FIXME: Allow lookup into non-dependent bases of dependent bases, possibly
157 // by calling or integrating with the main LookupQualifiedName mechanism.
158 for (NamedDecl *ND : BasePrimaryTemplate->lookup(&II)) {
161 FoundTypeDecl = isa<TypeDecl>(ND);
169 // We found some types in dependent base classes. Recover as if the user
170 // wrote 'typename MyClass::II' instead of 'II'. We'll fully resolve the
171 // lookup during template instantiation.
172 S.Diag(NameLoc, diag::ext_found_via_dependent_bases_lookup) << &II;
174 ASTContext &Context = S.Context;
175 auto *NNS = NestedNameSpecifier::Create(Context, nullptr, false,
176 cast<Type>(Context.getRecordType(RD)));
177 QualType T = Context.getDependentNameType(ETK_Typename, NNS, &II);
180 SS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
182 TypeLocBuilder Builder;
183 DependentNameTypeLoc DepTL = Builder.push<DependentNameTypeLoc>(T);
184 DepTL.setNameLoc(NameLoc);
185 DepTL.setElaboratedKeywordLoc(SourceLocation());
186 DepTL.setQualifierLoc(SS.getWithLocInContext(Context));
187 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
190 /// \brief If the identifier refers to a type name within this scope,
191 /// return the declaration of that type.
193 /// This routine performs ordinary name lookup of the identifier II
194 /// within the given scope, with optional C++ scope specifier SS, to
195 /// determine whether the name refers to a type. If so, returns an
196 /// opaque pointer (actually a QualType) corresponding to that
197 /// type. Otherwise, returns NULL.
198 ParsedType Sema::getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
199 Scope *S, CXXScopeSpec *SS,
200 bool isClassName, bool HasTrailingDot,
201 ParsedType ObjectTypePtr,
202 bool IsCtorOrDtorName,
203 bool WantNontrivialTypeSourceInfo,
204 IdentifierInfo **CorrectedII) {
205 // Determine where we will perform name lookup.
206 DeclContext *LookupCtx = nullptr;
208 QualType ObjectType = ObjectTypePtr.get();
209 if (ObjectType->isRecordType())
210 LookupCtx = computeDeclContext(ObjectType);
211 } else if (SS && SS->isNotEmpty()) {
212 LookupCtx = computeDeclContext(*SS, false);
215 if (isDependentScopeSpecifier(*SS)) {
217 // A qualified-id that refers to a type and in which the
218 // nested-name-specifier depends on a template-parameter (14.6.2)
219 // shall be prefixed by the keyword typename to indicate that the
220 // qualified-id denotes a type, forming an
221 // elaborated-type-specifier (7.1.5.3).
223 // We therefore do not perform any name lookup if the result would
224 // refer to a member of an unknown specialization.
225 if (!isClassName && !IsCtorOrDtorName)
228 // We know from the grammar that this name refers to a type,
229 // so build a dependent node to describe the type.
230 if (WantNontrivialTypeSourceInfo)
231 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
233 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
234 QualType T = CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
236 return ParsedType::make(T);
242 if (!LookupCtx->isDependentContext() &&
243 RequireCompleteDeclContext(*SS, LookupCtx))
247 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
248 // lookup for class-names.
249 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
251 LookupResult Result(*this, &II, NameLoc, Kind);
253 // Perform "qualified" name lookup into the declaration context we
254 // computed, which is either the type of the base of a member access
255 // expression or the declaration context associated with a prior
256 // nested-name-specifier.
257 LookupQualifiedName(Result, LookupCtx);
259 if (ObjectTypePtr && Result.empty()) {
260 // C++ [basic.lookup.classref]p3:
261 // If the unqualified-id is ~type-name, the type-name is looked up
262 // in the context of the entire postfix-expression. If the type T of
263 // the object expression is of a class type C, the type-name is also
264 // looked up in the scope of class C. At least one of the lookups shall
265 // find a name that refers to (possibly cv-qualified) T.
266 LookupName(Result, S);
269 // Perform unqualified name lookup.
270 LookupName(Result, S);
272 // For unqualified lookup in a class template in MSVC mode, look into
273 // dependent base classes where the primary class template is known.
274 if (Result.empty() && getLangOpts().MSVCCompat && (!SS || SS->isEmpty())) {
275 if (ParsedType TypeInBase =
276 recoverFromTypeInKnownDependentBase(*this, II, NameLoc))
281 NamedDecl *IIDecl = nullptr;
282 switch (Result.getResultKind()) {
283 case LookupResult::NotFound:
284 case LookupResult::NotFoundInCurrentInstantiation:
286 TypeNameValidatorCCC Validator(true, isClassName);
287 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(),
288 Kind, S, SS, Validator,
290 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
292 bool MemberOfUnknownSpecialization;
293 UnqualifiedId TemplateName;
294 TemplateName.setIdentifier(NewII, NameLoc);
295 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
296 CXXScopeSpec NewSS, *NewSSPtr = SS;
298 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
301 if (Correction && (NNS || NewII != &II) &&
302 // Ignore a correction to a template type as the to-be-corrected
303 // identifier is not a template (typo correction for template names
304 // is handled elsewhere).
305 !(getLangOpts().CPlusPlus && NewSSPtr &&
306 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(),
307 false, Template, MemberOfUnknownSpecialization))) {
308 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
309 isClassName, HasTrailingDot, ObjectTypePtr,
311 WantNontrivialTypeSourceInfo);
313 diagnoseTypo(Correction,
314 PDiag(diag::err_unknown_type_or_class_name_suggest)
315 << Result.getLookupName() << isClassName);
317 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
318 *CorrectedII = NewII;
323 // If typo correction failed or was not performed, fall through
324 case LookupResult::FoundOverloaded:
325 case LookupResult::FoundUnresolvedValue:
326 Result.suppressDiagnostics();
329 case LookupResult::Ambiguous:
330 // Recover from type-hiding ambiguities by hiding the type. We'll
331 // do the lookup again when looking for an object, and we can
332 // diagnose the error then. If we don't do this, then the error
333 // about hiding the type will be immediately followed by an error
334 // that only makes sense if the identifier was treated like a type.
335 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
336 Result.suppressDiagnostics();
340 // Look to see if we have a type anywhere in the list of results.
341 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
342 Res != ResEnd; ++Res) {
343 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
345 (*Res)->getLocation().getRawEncoding() <
346 IIDecl->getLocation().getRawEncoding())
352 // None of the entities we found is a type, so there is no way
353 // to even assume that the result is a type. In this case, don't
354 // complain about the ambiguity. The parser will either try to
355 // perform this lookup again (e.g., as an object name), which
356 // will produce the ambiguity, or will complain that it expected
358 Result.suppressDiagnostics();
362 // We found a type within the ambiguous lookup; diagnose the
363 // ambiguity and then return that type. This might be the right
364 // answer, or it might not be, but it suppresses any attempt to
365 // perform the name lookup again.
368 case LookupResult::Found:
369 IIDecl = Result.getFoundDecl();
373 assert(IIDecl && "Didn't find decl");
376 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
377 DiagnoseUseOfDecl(IIDecl, NameLoc);
379 T = Context.getTypeDeclType(TD);
381 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a
382 // constructor or destructor name (in such a case, the scope specifier
383 // will be attached to the enclosing Expr or Decl node).
384 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) {
385 if (WantNontrivialTypeSourceInfo) {
386 // Construct a type with type-source information.
387 TypeLocBuilder Builder;
388 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
390 T = getElaboratedType(ETK_None, *SS, T);
391 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
392 ElabTL.setElaboratedKeywordLoc(SourceLocation());
393 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
394 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
396 T = getElaboratedType(ETK_None, *SS, T);
399 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
400 (void)DiagnoseUseOfDecl(IDecl, NameLoc);
402 T = Context.getObjCInterfaceType(IDecl);
406 // If it's not plausibly a type, suppress diagnostics.
407 Result.suppressDiagnostics();
410 return ParsedType::make(T);
413 // Builds a fake NNS for the given decl context.
414 static NestedNameSpecifier *
415 synthesizeCurrentNestedNameSpecifier(ASTContext &Context, DeclContext *DC) {
416 for (;; DC = DC->getLookupParent()) {
417 DC = DC->getPrimaryContext();
418 auto *ND = dyn_cast<NamespaceDecl>(DC);
419 if (ND && !ND->isInline() && !ND->isAnonymousNamespace())
420 return NestedNameSpecifier::Create(Context, nullptr, ND);
421 else if (auto *RD = dyn_cast<CXXRecordDecl>(DC))
422 return NestedNameSpecifier::Create(Context, nullptr, RD->isTemplateDecl(),
423 RD->getTypeForDecl());
424 else if (isa<TranslationUnitDecl>(DC))
425 return NestedNameSpecifier::GlobalSpecifier(Context);
427 llvm_unreachable("something isn't in TU scope?");
430 ParsedType Sema::ActOnDelayedDefaultTemplateArg(const IdentifierInfo &II,
431 SourceLocation NameLoc) {
432 // Accepting an undeclared identifier as a default argument for a template
433 // type parameter is a Microsoft extension.
434 Diag(NameLoc, diag::ext_ms_delayed_template_argument) << &II;
436 // Build a fake DependentNameType that will perform lookup into CurContext at
437 // instantiation time. The name specifier isn't dependent, so template
438 // instantiation won't transform it. It will retry the lookup, however.
439 NestedNameSpecifier *NNS =
440 synthesizeCurrentNestedNameSpecifier(Context, CurContext);
441 QualType T = Context.getDependentNameType(ETK_None, NNS, &II);
443 // Build type location information. We synthesized the qualifier, so we have
444 // to build a fake NestedNameSpecifierLoc.
445 NestedNameSpecifierLocBuilder NNSLocBuilder;
446 NNSLocBuilder.MakeTrivial(Context, NNS, SourceRange(NameLoc));
447 NestedNameSpecifierLoc QualifierLoc = NNSLocBuilder.getWithLocInContext(Context);
449 TypeLocBuilder Builder;
450 DependentNameTypeLoc DepTL = Builder.push<DependentNameTypeLoc>(T);
451 DepTL.setNameLoc(NameLoc);
452 DepTL.setElaboratedKeywordLoc(SourceLocation());
453 DepTL.setQualifierLoc(QualifierLoc);
454 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
457 /// isTagName() - This method is called *for error recovery purposes only*
458 /// to determine if the specified name is a valid tag name ("struct foo"). If
459 /// so, this returns the TST for the tag corresponding to it (TST_enum,
460 /// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose
461 /// cases in C where the user forgot to specify the tag.
462 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
463 // Do a tag name lookup in this scope.
464 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
465 LookupName(R, S, false);
466 R.suppressDiagnostics();
467 if (R.getResultKind() == LookupResult::Found)
468 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
469 switch (TD->getTagKind()) {
470 case TTK_Struct: return DeclSpec::TST_struct;
471 case TTK_Interface: return DeclSpec::TST_interface;
472 case TTK_Union: return DeclSpec::TST_union;
473 case TTK_Class: return DeclSpec::TST_class;
474 case TTK_Enum: return DeclSpec::TST_enum;
478 return DeclSpec::TST_unspecified;
481 /// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
482 /// if a CXXScopeSpec's type is equal to the type of one of the base classes
483 /// then downgrade the missing typename error to a warning.
484 /// This is needed for MSVC compatibility; Example:
486 /// template<class T> class A {
488 /// typedef int TYPE;
490 /// template<class T> class B : public A<T> {
492 /// A<T>::TYPE a; // no typename required because A<T> is a base class.
495 bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
496 if (CurContext->isRecord()) {
497 const Type *Ty = SS->getScopeRep()->getAsType();
499 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
500 for (const auto &Base : RD->bases())
501 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base.getType()))
503 return S->isFunctionPrototypeScope();
505 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
508 void Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
509 SourceLocation IILoc,
512 ParsedType &SuggestedType,
513 bool AllowClassTemplates) {
514 // We don't have anything to suggest (yet).
515 SuggestedType = ParsedType();
517 // There may have been a typo in the name of the type. Look up typo
518 // results, in case we have something that we can suggest.
519 TypeNameValidatorCCC Validator(false, false, AllowClassTemplates);
520 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc),
521 LookupOrdinaryName, S, SS,
522 Validator, CTK_ErrorRecovery)) {
523 if (Corrected.isKeyword()) {
524 // We corrected to a keyword.
525 diagnoseTypo(Corrected, PDiag(diag::err_unknown_typename_suggest) << II);
526 II = Corrected.getCorrectionAsIdentifierInfo();
528 // We found a similarly-named type or interface; suggest that.
529 if (!SS || !SS->isSet()) {
530 diagnoseTypo(Corrected,
531 PDiag(diag::err_unknown_typename_suggest) << II);
532 } else if (DeclContext *DC = computeDeclContext(*SS, false)) {
533 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
534 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
535 II->getName().equals(CorrectedStr);
536 diagnoseTypo(Corrected,
537 PDiag(diag::err_unknown_nested_typename_suggest)
538 << II << DC << DroppedSpecifier << SS->getRange());
540 llvm_unreachable("could not have corrected a typo here");
544 if (Corrected.getCorrectionSpecifier())
545 tmpSS.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
547 SuggestedType = getTypeName(*Corrected.getCorrectionAsIdentifierInfo(),
548 IILoc, S, tmpSS.isSet() ? &tmpSS : SS, false,
550 /*IsCtorOrDtorName=*/false,
551 /*NonTrivialTypeSourceInfo=*/true);
556 if (getLangOpts().CPlusPlus) {
557 // See if II is a class template that the user forgot to pass arguments to.
559 Name.setIdentifier(II, IILoc);
560 CXXScopeSpec EmptySS;
561 TemplateTy TemplateResult;
562 bool MemberOfUnknownSpecialization;
563 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
564 Name, ParsedType(), true, TemplateResult,
565 MemberOfUnknownSpecialization) == TNK_Type_template) {
566 TemplateName TplName = TemplateResult.get();
567 Diag(IILoc, diag::err_template_missing_args) << TplName;
568 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
569 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
570 << TplDecl->getTemplateParameters()->getSourceRange();
576 // FIXME: Should we move the logic that tries to recover from a missing tag
577 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
579 if (!SS || (!SS->isSet() && !SS->isInvalid()))
580 Diag(IILoc, diag::err_unknown_typename) << II;
581 else if (DeclContext *DC = computeDeclContext(*SS, false))
582 Diag(IILoc, diag::err_typename_nested_not_found)
583 << II << DC << SS->getRange();
584 else if (isDependentScopeSpecifier(*SS)) {
585 unsigned DiagID = diag::err_typename_missing;
586 if (getLangOpts().MSVCCompat && isMicrosoftMissingTypename(SS, S))
587 DiagID = diag::ext_typename_missing;
589 Diag(SS->getRange().getBegin(), DiagID)
590 << SS->getScopeRep() << II->getName()
591 << SourceRange(SS->getRange().getBegin(), IILoc)
592 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
593 SuggestedType = ActOnTypenameType(S, SourceLocation(),
594 *SS, *II, IILoc).get();
596 assert(SS && SS->isInvalid() &&
597 "Invalid scope specifier has already been diagnosed");
601 /// \brief Determine whether the given result set contains either a type name
603 static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
604 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus &&
605 NextToken.is(tok::less);
607 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
608 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
611 if (CheckTemplate && isa<TemplateDecl>(*I))
618 static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result,
619 Scope *S, CXXScopeSpec &SS,
620 IdentifierInfo *&Name,
621 SourceLocation NameLoc) {
622 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName);
623 SemaRef.LookupParsedName(R, S, &SS);
624 if (TagDecl *Tag = R.getAsSingle<TagDecl>()) {
625 StringRef FixItTagName;
626 switch (Tag->getTagKind()) {
628 FixItTagName = "class ";
632 FixItTagName = "enum ";
636 FixItTagName = "struct ";
640 FixItTagName = "__interface ";
644 FixItTagName = "union ";
648 StringRef TagName = FixItTagName.drop_back();
649 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
650 << Name << TagName << SemaRef.getLangOpts().CPlusPlus
651 << FixItHint::CreateInsertion(NameLoc, FixItTagName);
653 for (LookupResult::iterator I = Result.begin(), IEnd = Result.end();
655 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
658 // Replace lookup results with just the tag decl.
659 Result.clear(Sema::LookupTagName);
660 SemaRef.LookupParsedName(Result, S, &SS);
667 /// Build a ParsedType for a simple-type-specifier with a nested-name-specifier.
668 static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS,
669 QualType T, SourceLocation NameLoc) {
670 ASTContext &Context = S.Context;
672 TypeLocBuilder Builder;
673 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
675 T = S.getElaboratedType(ETK_None, SS, T);
676 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
677 ElabTL.setElaboratedKeywordLoc(SourceLocation());
678 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
679 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
682 Sema::NameClassification Sema::ClassifyName(Scope *S,
684 IdentifierInfo *&Name,
685 SourceLocation NameLoc,
686 const Token &NextToken,
687 bool IsAddressOfOperand,
688 CorrectionCandidateCallback *CCC) {
689 DeclarationNameInfo NameInfo(Name, NameLoc);
690 ObjCMethodDecl *CurMethod = getCurMethodDecl();
692 if (NextToken.is(tok::coloncolon)) {
693 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(),
694 QualType(), false, SS, nullptr, false);
697 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
698 LookupParsedName(Result, S, &SS, !CurMethod);
700 // For unqualified lookup in a class template in MSVC mode, look into
701 // dependent base classes where the primary class template is known.
702 if (Result.empty() && SS.isEmpty() && getLangOpts().MSVCCompat) {
703 if (ParsedType TypeInBase =
704 recoverFromTypeInKnownDependentBase(*this, *Name, NameLoc))
708 // Perform lookup for Objective-C instance variables (including automatically
709 // synthesized instance variables), if we're in an Objective-C method.
710 // FIXME: This lookup really, really needs to be folded in to the normal
711 // unqualified lookup mechanism.
712 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
713 ExprResult E = LookupInObjCMethod(Result, S, Name, true);
714 if (E.get() || E.isInvalid())
718 bool SecondTry = false;
719 bool IsFilteredTemplateName = false;
722 switch (Result.getResultKind()) {
723 case LookupResult::NotFound:
724 // If an unqualified-id is followed by a '(', then we have a function
726 if (!SS.isSet() && NextToken.is(tok::l_paren)) {
727 // In C++, this is an ADL-only call.
729 if (getLangOpts().CPlusPlus)
730 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
733 // If the expression that precedes the parenthesized argument list in a
734 // function call consists solely of an identifier, and if no
735 // declaration is visible for this identifier, the identifier is
736 // implicitly declared exactly as if, in the innermost block containing
737 // the function call, the declaration
739 // extern int identifier ();
743 // We also allow this in C99 as an extension.
744 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
746 Result.resolveKind();
747 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
751 // In C, we first see whether there is a tag type by the same name, in
752 // which case it's likely that the user just forget to write "enum",
753 // "struct", or "union".
754 if (!getLangOpts().CPlusPlus && !SecondTry &&
755 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
759 // Perform typo correction to determine if there is another name that is
760 // close to this name.
761 if (!SecondTry && CCC) {
763 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
764 Result.getLookupKind(), S,
766 CTK_ErrorRecovery)) {
767 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
768 unsigned QualifiedDiag = diag::err_no_member_suggest;
770 NamedDecl *FirstDecl = Corrected.getCorrectionDecl();
771 NamedDecl *UnderlyingFirstDecl
772 = FirstDecl? FirstDecl->getUnderlyingDecl() : nullptr;
773 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
774 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
775 UnqualifiedDiag = diag::err_no_template_suggest;
776 QualifiedDiag = diag::err_no_member_template_suggest;
777 } else if (UnderlyingFirstDecl &&
778 (isa<TypeDecl>(UnderlyingFirstDecl) ||
779 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
780 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
781 UnqualifiedDiag = diag::err_unknown_typename_suggest;
782 QualifiedDiag = diag::err_unknown_nested_typename_suggest;
786 diagnoseTypo(Corrected, PDiag(UnqualifiedDiag) << Name);
787 } else {// FIXME: is this even reachable? Test it.
788 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
789 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
790 Name->getName().equals(CorrectedStr);
791 diagnoseTypo(Corrected, PDiag(QualifiedDiag)
792 << Name << computeDeclContext(SS, false)
793 << DroppedSpecifier << SS.getRange());
796 // Update the name, so that the caller has the new name.
797 Name = Corrected.getCorrectionAsIdentifierInfo();
799 // Typo correction corrected to a keyword.
800 if (Corrected.isKeyword())
803 // Also update the LookupResult...
804 // FIXME: This should probably go away at some point
806 Result.setLookupName(Corrected.getCorrection());
808 Result.addDecl(FirstDecl);
810 // If we found an Objective-C instance variable, let
811 // LookupInObjCMethod build the appropriate expression to
812 // reference the ivar.
813 // FIXME: This is a gross hack.
814 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
816 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
824 // We failed to correct; just fall through and let the parser deal with it.
825 Result.suppressDiagnostics();
826 return NameClassification::Unknown();
828 case LookupResult::NotFoundInCurrentInstantiation: {
829 // We performed name lookup into the current instantiation, and there were
830 // dependent bases, so we treat this result the same way as any other
831 // dependent nested-name-specifier.
834 // A name used in a template declaration or definition and that is
835 // dependent on a template-parameter is assumed not to name a type
836 // unless the applicable name lookup finds a type name or the name is
837 // qualified by the keyword typename.
839 // FIXME: If the next token is '<', we might want to ask the parser to
840 // perform some heroics to see if we actually have a
841 // template-argument-list, which would indicate a missing 'template'
843 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(),
844 NameInfo, IsAddressOfOperand,
845 /*TemplateArgs=*/nullptr);
848 case LookupResult::Found:
849 case LookupResult::FoundOverloaded:
850 case LookupResult::FoundUnresolvedValue:
853 case LookupResult::Ambiguous:
854 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
855 hasAnyAcceptableTemplateNames(Result)) {
856 // C++ [temp.local]p3:
857 // A lookup that finds an injected-class-name (10.2) can result in an
858 // ambiguity in certain cases (for example, if it is found in more than
859 // one base class). If all of the injected-class-names that are found
860 // refer to specializations of the same class template, and if the name
861 // is followed by a template-argument-list, the reference refers to the
862 // class template itself and not a specialization thereof, and is not
865 // This filtering can make an ambiguous result into an unambiguous one,
866 // so try again after filtering out template names.
867 FilterAcceptableTemplateNames(Result);
868 if (!Result.isAmbiguous()) {
869 IsFilteredTemplateName = true;
874 // Diagnose the ambiguity and return an error.
875 return NameClassification::Error();
878 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
879 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
880 // C++ [temp.names]p3:
881 // After name lookup (3.4) finds that a name is a template-name or that
882 // an operator-function-id or a literal- operator-id refers to a set of
883 // overloaded functions any member of which is a function template if
884 // this is followed by a <, the < is always taken as the delimiter of a
885 // template-argument-list and never as the less-than operator.
886 if (!IsFilteredTemplateName)
887 FilterAcceptableTemplateNames(Result);
889 if (!Result.empty()) {
890 bool IsFunctionTemplate;
892 TemplateName Template;
893 if (Result.end() - Result.begin() > 1) {
894 IsFunctionTemplate = true;
895 Template = Context.getOverloadedTemplateName(Result.begin(),
899 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
900 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
901 IsVarTemplate = isa<VarTemplateDecl>(TD);
903 if (SS.isSet() && !SS.isInvalid())
904 Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
905 /*TemplateKeyword=*/false,
908 Template = TemplateName(TD);
911 if (IsFunctionTemplate) {
912 // Function templates always go through overload resolution, at which
913 // point we'll perform the various checks (e.g., accessibility) we need
914 // to based on which function we selected.
915 Result.suppressDiagnostics();
917 return NameClassification::FunctionTemplate(Template);
920 return IsVarTemplate ? NameClassification::VarTemplate(Template)
921 : NameClassification::TypeTemplate(Template);
925 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
926 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
927 DiagnoseUseOfDecl(Type, NameLoc);
928 QualType T = Context.getTypeDeclType(Type);
930 return buildNestedType(*this, SS, T, NameLoc);
931 return ParsedType::make(T);
934 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
936 // FIXME: It's unfortunate that we don't have a Type node for handling this.
937 if (ObjCCompatibleAliasDecl *Alias =
938 dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
939 Class = Alias->getClassInterface();
943 DiagnoseUseOfDecl(Class, NameLoc);
945 if (NextToken.is(tok::period)) {
946 // Interface. <something> is parsed as a property reference expression.
947 // Just return "unknown" as a fall-through for now.
948 Result.suppressDiagnostics();
949 return NameClassification::Unknown();
952 QualType T = Context.getObjCInterfaceType(Class);
953 return ParsedType::make(T);
956 // We can have a type template here if we're classifying a template argument.
957 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl))
958 return NameClassification::TypeTemplate(
959 TemplateName(cast<TemplateDecl>(FirstDecl)));
961 // Check for a tag type hidden by a non-type decl in a few cases where it
962 // seems likely a type is wanted instead of the non-type that was found.
963 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star);
964 if ((NextToken.is(tok::identifier) ||
966 FirstDecl->getUnderlyingDecl()->isFunctionOrFunctionTemplate())) &&
967 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
968 TypeDecl *Type = Result.getAsSingle<TypeDecl>();
969 DiagnoseUseOfDecl(Type, NameLoc);
970 QualType T = Context.getTypeDeclType(Type);
972 return buildNestedType(*this, SS, T, NameLoc);
973 return ParsedType::make(T);
976 if (FirstDecl->isCXXClassMember())
977 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result,
980 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
981 return BuildDeclarationNameExpr(SS, Result, ADL);
984 // Determines the context to return to after temporarily entering a
985 // context. This depends in an unnecessarily complicated way on the
986 // exact ordering of callbacks from the parser.
987 DeclContext *Sema::getContainingDC(DeclContext *DC) {
989 // Functions defined inline within classes aren't parsed until we've
990 // finished parsing the top-level class, so the top-level class is
991 // the context we'll need to return to.
992 // A Lambda call operator whose parent is a class must not be treated
993 // as an inline member function. A Lambda can be used legally
994 // either as an in-class member initializer or a default argument. These
995 // are parsed once the class has been marked complete and so the containing
996 // context would be the nested class (when the lambda is defined in one);
997 // If the class is not complete, then the lambda is being used in an
998 // ill-formed fashion (such as to specify the width of a bit-field, or
999 // in an array-bound) - in which case we still want to return the
1000 // lexically containing DC (which could be a nested class).
1001 if (isa<FunctionDecl>(DC) && !isLambdaCallOperator(DC)) {
1002 DC = DC->getLexicalParent();
1004 // A function not defined within a class will always return to its
1006 if (!isa<CXXRecordDecl>(DC))
1009 // A C++ inline method/friend is parsed *after* the topmost class
1010 // it was declared in is fully parsed ("complete"); the topmost
1011 // class is the context we need to return to.
1012 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
1015 // Return the declaration context of the topmost class the inline method is
1020 return DC->getLexicalParent();
1023 void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
1024 assert(getContainingDC(DC) == CurContext &&
1025 "The next DeclContext should be lexically contained in the current one.");
1030 void Sema::PopDeclContext() {
1031 assert(CurContext && "DeclContext imbalance!");
1033 CurContext = getContainingDC(CurContext);
1034 assert(CurContext && "Popped translation unit!");
1037 /// EnterDeclaratorContext - Used when we must lookup names in the context
1038 /// of a declarator's nested name specifier.
1040 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
1041 // C++0x [basic.lookup.unqual]p13:
1042 // A name used in the definition of a static data member of class
1043 // X (after the qualified-id of the static member) is looked up as
1044 // if the name was used in a member function of X.
1045 // C++0x [basic.lookup.unqual]p14:
1046 // If a variable member of a namespace is defined outside of the
1047 // scope of its namespace then any name used in the definition of
1048 // the variable member (after the declarator-id) is looked up as
1049 // if the definition of the variable member occurred in its
1051 // Both of these imply that we should push a scope whose context
1052 // is the semantic context of the declaration. We can't use
1053 // PushDeclContext here because that context is not necessarily
1054 // lexically contained in the current context. Fortunately,
1055 // the containing scope should have the appropriate information.
1057 assert(!S->getEntity() && "scope already has entity");
1060 Scope *Ancestor = S->getParent();
1061 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
1062 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
1069 void Sema::ExitDeclaratorContext(Scope *S) {
1070 assert(S->getEntity() == CurContext && "Context imbalance!");
1072 // Switch back to the lexical context. The safety of this is
1073 // enforced by an assert in EnterDeclaratorContext.
1074 Scope *Ancestor = S->getParent();
1075 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
1076 CurContext = Ancestor->getEntity();
1078 // We don't need to do anything with the scope, which is going to
1083 void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
1084 // We assume that the caller has already called
1085 // ActOnReenterTemplateScope so getTemplatedDecl() works.
1086 FunctionDecl *FD = D->getAsFunction();
1090 // Same implementation as PushDeclContext, but enters the context
1091 // from the lexical parent, rather than the top-level class.
1092 assert(CurContext == FD->getLexicalParent() &&
1093 "The next DeclContext should be lexically contained in the current one.");
1095 S->setEntity(CurContext);
1097 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
1098 ParmVarDecl *Param = FD->getParamDecl(P);
1099 // If the parameter has an identifier, then add it to the scope
1100 if (Param->getIdentifier()) {
1102 IdResolver.AddDecl(Param);
1108 void Sema::ActOnExitFunctionContext() {
1109 // Same implementation as PopDeclContext, but returns to the lexical parent,
1110 // rather than the top-level class.
1111 assert(CurContext && "DeclContext imbalance!");
1112 CurContext = CurContext->getLexicalParent();
1113 assert(CurContext && "Popped translation unit!");
1117 /// \brief Determine whether we allow overloading of the function
1118 /// PrevDecl with another declaration.
1120 /// This routine determines whether overloading is possible, not
1121 /// whether some new function is actually an overload. It will return
1122 /// true in C++ (where we can always provide overloads) or, as an
1123 /// extension, in C when the previous function is already an
1124 /// overloaded function declaration or has the "overloadable"
1126 static bool AllowOverloadingOfFunction(LookupResult &Previous,
1127 ASTContext &Context) {
1128 if (Context.getLangOpts().CPlusPlus)
1131 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
1134 return (Previous.getResultKind() == LookupResult::Found
1135 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
1138 /// Add this decl to the scope shadowed decl chains.
1139 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
1140 // Move up the scope chain until we find the nearest enclosing
1141 // non-transparent context. The declaration will be introduced into this
1143 while (S->getEntity() && S->getEntity()->isTransparentContext())
1146 // Add scoped declarations into their context, so that they can be
1147 // found later. Declarations without a context won't be inserted
1148 // into any context.
1150 CurContext->addDecl(D);
1152 // Out-of-line definitions shouldn't be pushed into scope in C++, unless they
1153 // are function-local declarations.
1154 if (getLangOpts().CPlusPlus && D->isOutOfLine() &&
1155 !D->getDeclContext()->getRedeclContext()->Equals(
1156 D->getLexicalDeclContext()->getRedeclContext()) &&
1157 !D->getLexicalDeclContext()->isFunctionOrMethod())
1160 // Template instantiations should also not be pushed into scope.
1161 if (isa<FunctionDecl>(D) &&
1162 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
1165 // If this replaces anything in the current scope,
1166 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
1167 IEnd = IdResolver.end();
1168 for (; I != IEnd; ++I) {
1169 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
1171 IdResolver.RemoveDecl(*I);
1173 // Should only need to replace one decl.
1180 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
1181 // Implicitly-generated labels may end up getting generated in an order that
1182 // isn't strictly lexical, which breaks name lookup. Be careful to insert
1183 // the label at the appropriate place in the identifier chain.
1184 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
1185 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
1186 if (IDC == CurContext) {
1187 if (!S->isDeclScope(*I))
1189 } else if (IDC->Encloses(CurContext))
1193 IdResolver.InsertDeclAfter(I, D);
1195 IdResolver.AddDecl(D);
1199 void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) {
1200 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope)
1201 TUScope->AddDecl(D);
1204 bool Sema::isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S,
1205 bool AllowInlineNamespace) {
1206 return IdResolver.isDeclInScope(D, Ctx, S, AllowInlineNamespace);
1209 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
1210 DeclContext *TargetDC = DC->getPrimaryContext();
1212 if (DeclContext *ScopeDC = S->getEntity())
1213 if (ScopeDC->getPrimaryContext() == TargetDC)
1215 } while ((S = S->getParent()));
1220 static bool isOutOfScopePreviousDeclaration(NamedDecl *,
1224 /// Filters out lookup results that don't fall within the given scope
1225 /// as determined by isDeclInScope.
1226 void Sema::FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
1227 bool ConsiderLinkage,
1228 bool AllowInlineNamespace) {
1229 LookupResult::Filter F = R.makeFilter();
1230 while (F.hasNext()) {
1231 NamedDecl *D = F.next();
1233 if (isDeclInScope(D, Ctx, S, AllowInlineNamespace))
1236 if (ConsiderLinkage && isOutOfScopePreviousDeclaration(D, Ctx, Context))
1245 static bool isUsingDecl(NamedDecl *D) {
1246 return isa<UsingShadowDecl>(D) ||
1247 isa<UnresolvedUsingTypenameDecl>(D) ||
1248 isa<UnresolvedUsingValueDecl>(D);
1251 /// Removes using shadow declarations from the lookup results.
1252 static void RemoveUsingDecls(LookupResult &R) {
1253 LookupResult::Filter F = R.makeFilter();
1255 if (isUsingDecl(F.next()))
1261 /// \brief Check for this common pattern:
1264 /// S(const S&); // DO NOT IMPLEMENT
1265 /// void operator=(const S&); // DO NOT IMPLEMENT
1268 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
1269 // FIXME: Should check for private access too but access is set after we get
1271 if (D->doesThisDeclarationHaveABody())
1274 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
1275 return CD->isCopyConstructor();
1276 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1277 return Method->isCopyAssignmentOperator();
1281 // We need this to handle
1284 // void *foo() { return 0; }
1287 // When we see foo we don't know if after the typedef we will get 'A' or '*A'
1288 // for example. If 'A', foo will have external linkage. If we have '*A',
1289 // foo will have no linkage. Since we can't know until we get to the end
1290 // of the typedef, this function finds out if D might have non-external linkage.
1291 // Callers should verify at the end of the TU if it D has external linkage or
1293 bool Sema::mightHaveNonExternalLinkage(const DeclaratorDecl *D) {
1294 const DeclContext *DC = D->getDeclContext();
1295 while (!DC->isTranslationUnit()) {
1296 if (const RecordDecl *RD = dyn_cast<RecordDecl>(DC)){
1297 if (!RD->hasNameForLinkage())
1300 DC = DC->getParent();
1303 return !D->isExternallyVisible();
1306 // FIXME: This needs to be refactored; some other isInMainFile users want
1308 static bool isMainFileLoc(const Sema &S, SourceLocation Loc) {
1309 if (S.TUKind != TU_Complete)
1311 return S.SourceMgr.isInMainFile(Loc);
1314 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
1317 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
1320 // Ignore all entities declared within templates, and out-of-line definitions
1321 // of members of class templates.
1322 if (D->getDeclContext()->isDependentContext() ||
1323 D->getLexicalDeclContext()->isDependentContext())
1326 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1327 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1330 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
1331 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
1334 // 'static inline' functions are defined in headers; don't warn.
1335 if (FD->isInlined() && !isMainFileLoc(*this, FD->getLocation()))
1339 if (FD->doesThisDeclarationHaveABody() &&
1340 Context.DeclMustBeEmitted(FD))
1342 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1343 // Constants and utility variables are defined in headers with internal
1344 // linkage; don't warn. (Unlike functions, there isn't a convenient marker
1346 if (!isMainFileLoc(*this, VD->getLocation()))
1349 if (Context.DeclMustBeEmitted(VD))
1352 if (VD->isStaticDataMember() &&
1353 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1359 // Only warn for unused decls internal to the translation unit.
1360 // FIXME: This seems like a bogus check; it suppresses -Wunused-function
1361 // for inline functions defined in the main source file, for instance.
1362 return mightHaveNonExternalLinkage(D);
1365 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
1369 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1370 const FunctionDecl *First = FD->getFirstDecl();
1371 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1372 return; // First should already be in the vector.
1375 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1376 const VarDecl *First = VD->getFirstDecl();
1377 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1378 return; // First should already be in the vector.
1381 if (ShouldWarnIfUnusedFileScopedDecl(D))
1382 UnusedFileScopedDecls.push_back(D);
1385 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
1386 if (D->isInvalidDecl())
1389 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>() ||
1390 D->hasAttr<ObjCPreciseLifetimeAttr>())
1393 if (isa<LabelDecl>(D))
1396 // White-list anything that isn't a local variable.
1397 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
1398 !D->getDeclContext()->isFunctionOrMethod())
1401 // Types of valid local variables should be complete, so this should succeed.
1402 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1404 // White-list anything with an __attribute__((unused)) type.
1405 QualType Ty = VD->getType();
1407 // Only look at the outermost level of typedef.
1408 if (const TypedefType *TT = Ty->getAs<TypedefType>()) {
1409 if (TT->getDecl()->hasAttr<UnusedAttr>())
1413 // If we failed to complete the type for some reason, or if the type is
1414 // dependent, don't diagnose the variable.
1415 if (Ty->isIncompleteType() || Ty->isDependentType())
1418 if (const TagType *TT = Ty->getAs<TagType>()) {
1419 const TagDecl *Tag = TT->getDecl();
1420 if (Tag->hasAttr<UnusedAttr>())
1423 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
1424 if (!RD->hasTrivialDestructor() && !RD->hasAttr<WarnUnusedAttr>())
1427 if (const Expr *Init = VD->getInit()) {
1428 if (const ExprWithCleanups *Cleanups =
1429 dyn_cast<ExprWithCleanups>(Init))
1430 Init = Cleanups->getSubExpr();
1431 const CXXConstructExpr *Construct =
1432 dyn_cast<CXXConstructExpr>(Init);
1433 if (Construct && !Construct->isElidable()) {
1434 CXXConstructorDecl *CD = Construct->getConstructor();
1435 if (!CD->isTrivial() && !RD->hasAttr<WarnUnusedAttr>())
1442 // TODO: __attribute__((unused)) templates?
1448 static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
1450 if (isa<LabelDecl>(D)) {
1451 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
1452 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true);
1453 if (AfterColon.isInvalid())
1455 Hint = FixItHint::CreateRemoval(CharSourceRange::
1456 getCharRange(D->getLocStart(), AfterColon));
1461 /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
1462 /// unless they are marked attr(unused).
1463 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
1464 if (!ShouldDiagnoseUnusedDecl(D))
1468 GenerateFixForUnusedDecl(D, Context, Hint);
1471 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
1472 DiagID = diag::warn_unused_exception_param;
1473 else if (isa<LabelDecl>(D))
1474 DiagID = diag::warn_unused_label;
1476 DiagID = diag::warn_unused_variable;
1478 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
1481 static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
1482 // Verify that we have no forward references left. If so, there was a goto
1483 // or address of a label taken, but no definition of it. Label fwd
1484 // definitions are indicated with a null substmt.
1485 if (L->getStmt() == nullptr)
1486 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
1489 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
1490 S->mergeNRVOIntoParent();
1492 if (S->decl_empty()) return;
1493 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
1494 "Scope shouldn't contain decls!");
1496 for (auto *TmpD : S->decls()) {
1497 assert(TmpD && "This decl didn't get pushed??");
1499 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
1500 NamedDecl *D = cast<NamedDecl>(TmpD);
1502 if (!D->getDeclName()) continue;
1504 // Diagnose unused variables in this scope.
1505 if (!S->hasUnrecoverableErrorOccurred())
1506 DiagnoseUnusedDecl(D);
1508 // If this was a forward reference to a label, verify it was defined.
1509 if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
1510 CheckPoppedLabel(LD, *this);
1512 // Remove this name from our lexical scope.
1513 IdResolver.RemoveDecl(D);
1517 /// \brief Look for an Objective-C class in the translation unit.
1519 /// \param Id The name of the Objective-C class we're looking for. If
1520 /// typo-correction fixes this name, the Id will be updated
1521 /// to the fixed name.
1523 /// \param IdLoc The location of the name in the translation unit.
1525 /// \param DoTypoCorrection If true, this routine will attempt typo correction
1526 /// if there is no class with the given name.
1528 /// \returns The declaration of the named Objective-C class, or NULL if the
1529 /// class could not be found.
1530 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
1531 SourceLocation IdLoc,
1532 bool DoTypoCorrection) {
1533 // The third "scope" argument is 0 since we aren't enabling lazy built-in
1534 // creation from this context.
1535 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
1537 if (!IDecl && DoTypoCorrection) {
1538 // Perform typo correction at the given location, but only if we
1539 // find an Objective-C class name.
1540 DeclFilterCCC<ObjCInterfaceDecl> Validator;
1541 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc),
1542 LookupOrdinaryName, TUScope, nullptr,
1543 Validator, CTK_ErrorRecovery)) {
1544 diagnoseTypo(C, PDiag(diag::err_undef_interface_suggest) << Id);
1545 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>();
1546 Id = IDecl->getIdentifier();
1549 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
1550 // This routine must always return a class definition, if any.
1551 if (Def && Def->getDefinition())
1552 Def = Def->getDefinition();
1556 /// getNonFieldDeclScope - Retrieves the innermost scope, starting
1557 /// from S, where a non-field would be declared. This routine copes
1558 /// with the difference between C and C++ scoping rules in structs and
1559 /// unions. For example, the following code is well-formed in C but
1560 /// ill-formed in C++:
1566 /// void test_S6() {
1571 /// For the declaration of BAR, this routine will return a different
1572 /// scope. The scope S will be the scope of the unnamed enumeration
1573 /// within S6. In C++, this routine will return the scope associated
1574 /// with S6, because the enumeration's scope is a transparent
1575 /// context but structures can contain non-field names. In C, this
1576 /// routine will return the translation unit scope, since the
1577 /// enumeration's scope is a transparent context and structures cannot
1578 /// contain non-field names.
1579 Scope *Sema::getNonFieldDeclScope(Scope *S) {
1580 while (((S->getFlags() & Scope::DeclScope) == 0) ||
1581 (S->getEntity() && S->getEntity()->isTransparentContext()) ||
1582 (S->isClassScope() && !getLangOpts().CPlusPlus))
1587 /// \brief Looks up the declaration of "struct objc_super" and
1588 /// saves it for later use in building builtin declaration of
1589 /// objc_msgSendSuper and objc_msgSendSuper_stret. If no such
1590 /// pre-existing declaration exists no action takes place.
1591 static void LookupPredefedObjCSuperType(Sema &ThisSema, Scope *S,
1592 IdentifierInfo *II) {
1593 if (!II->isStr("objc_msgSendSuper"))
1595 ASTContext &Context = ThisSema.Context;
1597 LookupResult Result(ThisSema, &Context.Idents.get("objc_super"),
1598 SourceLocation(), Sema::LookupTagName);
1599 ThisSema.LookupName(Result, S);
1600 if (Result.getResultKind() == LookupResult::Found)
1601 if (const TagDecl *TD = Result.getAsSingle<TagDecl>())
1602 Context.setObjCSuperType(Context.getTagDeclType(TD));
1605 static StringRef getHeaderName(ASTContext::GetBuiltinTypeError Error) {
1607 case ASTContext::GE_None:
1609 case ASTContext::GE_Missing_stdio:
1611 case ASTContext::GE_Missing_setjmp:
1613 case ASTContext::GE_Missing_ucontext:
1614 return "ucontext.h";
1616 llvm_unreachable("unhandled error kind");
1619 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
1620 /// file scope. lazily create a decl for it. ForRedeclaration is true
1621 /// if we're creating this built-in in anticipation of redeclaring the
1623 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
1624 Scope *S, bool ForRedeclaration,
1625 SourceLocation Loc) {
1626 LookupPredefedObjCSuperType(*this, S, II);
1628 Builtin::ID BID = (Builtin::ID)bid;
1630 ASTContext::GetBuiltinTypeError Error;
1631 QualType R = Context.GetBuiltinType(BID, Error);
1633 if (ForRedeclaration)
1634 Diag(Loc, diag::warn_implicit_decl_requires_sysheader)
1635 << getHeaderName(Error)
1636 << Context.BuiltinInfo.GetName(BID);
1640 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
1641 Diag(Loc, diag::ext_implicit_lib_function_decl)
1642 << Context.BuiltinInfo.GetName(BID)
1644 if (Context.BuiltinInfo.getHeaderName(BID) &&
1645 !Diags.isIgnored(diag::ext_implicit_lib_function_decl, Loc))
1646 Diag(Loc, diag::note_include_header_or_declare)
1647 << Context.BuiltinInfo.getHeaderName(BID)
1648 << Context.BuiltinInfo.GetName(BID);
1651 DeclContext *Parent = Context.getTranslationUnitDecl();
1652 if (getLangOpts().CPlusPlus) {
1653 LinkageSpecDecl *CLinkageDecl =
1654 LinkageSpecDecl::Create(Context, Parent, Loc, Loc,
1655 LinkageSpecDecl::lang_c, false);
1656 CLinkageDecl->setImplicit();
1657 Parent->addDecl(CLinkageDecl);
1658 Parent = CLinkageDecl;
1661 FunctionDecl *New = FunctionDecl::Create(Context,
1663 Loc, Loc, II, R, /*TInfo=*/nullptr,
1666 /*hasPrototype=*/true);
1669 // Create Decl objects for each parameter, adding them to the
1671 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
1672 SmallVector<ParmVarDecl*, 16> Params;
1673 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
1675 ParmVarDecl::Create(Context, New, SourceLocation(), SourceLocation(),
1676 nullptr, FT->getParamType(i), /*TInfo=*/nullptr,
1678 parm->setScopeInfo(0, i);
1679 Params.push_back(parm);
1681 New->setParams(Params);
1684 AddKnownFunctionAttributes(New);
1685 RegisterLocallyScopedExternCDecl(New, S);
1687 // TUScope is the translation-unit scope to insert this function into.
1688 // FIXME: This is hideous. We need to teach PushOnScopeChains to
1689 // relate Scopes to DeclContexts, and probably eliminate CurContext
1690 // entirely, but we're not there yet.
1691 DeclContext *SavedContext = CurContext;
1692 CurContext = Parent;
1693 PushOnScopeChains(New, TUScope);
1694 CurContext = SavedContext;
1698 /// \brief Filter out any previous declarations that the given declaration
1699 /// should not consider because they are not permitted to conflict, e.g.,
1700 /// because they come from hidden sub-modules and do not refer to the same
1702 static void filterNonConflictingPreviousDecls(ASTContext &context,
1704 LookupResult &previous){
1705 // This is only interesting when modules are enabled.
1706 if (!context.getLangOpts().Modules)
1709 // Empty sets are uninteresting.
1710 if (previous.empty())
1713 LookupResult::Filter filter = previous.makeFilter();
1714 while (filter.hasNext()) {
1715 NamedDecl *old = filter.next();
1717 // Non-hidden declarations are never ignored.
1718 if (!old->isHidden())
1721 if (!old->isExternallyVisible())
1728 bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
1730 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
1731 OldType = OldTypedef->getUnderlyingType();
1733 OldType = Context.getTypeDeclType(Old);
1734 QualType NewType = New->getUnderlyingType();
1736 if (NewType->isVariablyModifiedType()) {
1737 // Must not redefine a typedef with a variably-modified type.
1738 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1739 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef)
1741 if (Old->getLocation().isValid())
1742 Diag(Old->getLocation(), diag::note_previous_definition);
1743 New->setInvalidDecl();
1747 if (OldType != NewType &&
1748 !OldType->isDependentType() &&
1749 !NewType->isDependentType() &&
1750 !Context.hasSameType(OldType, NewType)) {
1751 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1752 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
1753 << Kind << NewType << OldType;
1754 if (Old->getLocation().isValid())
1755 Diag(Old->getLocation(), diag::note_previous_definition);
1756 New->setInvalidDecl();
1762 /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
1763 /// same name and scope as a previous declaration 'Old'. Figure out
1764 /// how to resolve this situation, merging decls or emitting
1765 /// diagnostics as appropriate. If there was an error, set New to be invalid.
1767 void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) {
1768 // If the new decl is known invalid already, don't bother doing any
1770 if (New->isInvalidDecl()) return;
1772 // Allow multiple definitions for ObjC built-in typedefs.
1773 // FIXME: Verify the underlying types are equivalent!
1774 if (getLangOpts().ObjC1) {
1775 const IdentifierInfo *TypeID = New->getIdentifier();
1776 switch (TypeID->getLength()) {
1780 if (!TypeID->isStr("id"))
1782 QualType T = New->getUnderlyingType();
1783 if (!T->isPointerType())
1785 if (!T->isVoidPointerType()) {
1786 QualType PT = T->getAs<PointerType>()->getPointeeType();
1787 if (!PT->isStructureType())
1790 Context.setObjCIdRedefinitionType(T);
1791 // Install the built-in type for 'id', ignoring the current definition.
1792 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
1796 if (!TypeID->isStr("Class"))
1798 Context.setObjCClassRedefinitionType(New->getUnderlyingType());
1799 // Install the built-in type for 'Class', ignoring the current definition.
1800 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
1803 if (!TypeID->isStr("SEL"))
1805 Context.setObjCSelRedefinitionType(New->getUnderlyingType());
1806 // Install the built-in type for 'SEL', ignoring the current definition.
1807 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
1810 // Fall through - the typedef name was not a builtin type.
1813 // Verify the old decl was also a type.
1814 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
1816 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1817 << New->getDeclName();
1819 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
1820 if (OldD->getLocation().isValid())
1821 Diag(OldD->getLocation(), diag::note_previous_definition);
1823 return New->setInvalidDecl();
1826 // If the old declaration is invalid, just give up here.
1827 if (Old->isInvalidDecl())
1828 return New->setInvalidDecl();
1830 // If the typedef types are not identical, reject them in all languages and
1831 // with any extensions enabled.
1832 if (isIncompatibleTypedef(Old, New))
1835 // The types match. Link up the redeclaration chain and merge attributes if
1836 // the old declaration was a typedef.
1837 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) {
1838 New->setPreviousDecl(Typedef);
1839 mergeDeclAttributes(New, Old);
1842 if (getLangOpts().MicrosoftExt)
1845 if (getLangOpts().CPlusPlus) {
1846 // C++ [dcl.typedef]p2:
1847 // In a given non-class scope, a typedef specifier can be used to
1848 // redefine the name of any type declared in that scope to refer
1849 // to the type to which it already refers.
1850 if (!isa<CXXRecordDecl>(CurContext))
1853 // C++0x [dcl.typedef]p4:
1854 // In a given class scope, a typedef specifier can be used to redefine
1855 // any class-name declared in that scope that is not also a typedef-name
1856 // to refer to the type to which it already refers.
1858 // This wording came in via DR424, which was a correction to the
1859 // wording in DR56, which accidentally banned code like:
1862 // typedef struct A { } A;
1865 // in the C++03 standard. We implement the C++0x semantics, which
1866 // allow the above but disallow
1873 // since that was the intent of DR56.
1874 if (!isa<TypedefNameDecl>(Old))
1877 Diag(New->getLocation(), diag::err_redefinition)
1878 << New->getDeclName();
1879 Diag(Old->getLocation(), diag::note_previous_definition);
1880 return New->setInvalidDecl();
1883 // Modules always permit redefinition of typedefs, as does C11.
1884 if (getLangOpts().Modules || getLangOpts().C11)
1887 // If we have a redefinition of a typedef in C, emit a warning. This warning
1888 // is normally mapped to an error, but can be controlled with
1889 // -Wtypedef-redefinition. If either the original or the redefinition is
1890 // in a system header, don't emit this for compatibility with GCC.
1891 if (getDiagnostics().getSuppressSystemWarnings() &&
1892 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
1893 Context.getSourceManager().isInSystemHeader(New->getLocation())))
1896 Diag(New->getLocation(), diag::ext_redefinition_of_typedef)
1897 << New->getDeclName();
1898 Diag(Old->getLocation(), diag::note_previous_definition);
1902 /// DeclhasAttr - returns true if decl Declaration already has the target
1904 static bool DeclHasAttr(const Decl *D, const Attr *A) {
1905 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
1906 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
1907 for (const auto *i : D->attrs())
1908 if (i->getKind() == A->getKind()) {
1910 if (Ann->getAnnotation() == cast<AnnotateAttr>(i)->getAnnotation())
1914 // FIXME: Don't hardcode this check
1915 if (OA && isa<OwnershipAttr>(i))
1916 return OA->getOwnKind() == cast<OwnershipAttr>(i)->getOwnKind();
1923 static bool isAttributeTargetADefinition(Decl *D) {
1924 if (VarDecl *VD = dyn_cast<VarDecl>(D))
1925 return VD->isThisDeclarationADefinition();
1926 if (TagDecl *TD = dyn_cast<TagDecl>(D))
1927 return TD->isCompleteDefinition() || TD->isBeingDefined();
1931 /// Merge alignment attributes from \p Old to \p New, taking into account the
1932 /// special semantics of C11's _Alignas specifier and C++11's alignas attribute.
1934 /// \return \c true if any attributes were added to \p New.
1935 static bool mergeAlignedAttrs(Sema &S, NamedDecl *New, Decl *Old) {
1936 // Look for alignas attributes on Old, and pick out whichever attribute
1937 // specifies the strictest alignment requirement.
1938 AlignedAttr *OldAlignasAttr = nullptr;
1939 AlignedAttr *OldStrictestAlignAttr = nullptr;
1940 unsigned OldAlign = 0;
1941 for (auto *I : Old->specific_attrs<AlignedAttr>()) {
1942 // FIXME: We have no way of representing inherited dependent alignments
1944 // template<int A, int B> struct alignas(A) X;
1945 // template<int A, int B> struct alignas(B) X {};
1946 // For now, we just ignore any alignas attributes which are not on the
1947 // definition in such a case.
1948 if (I->isAlignmentDependent())
1954 unsigned Align = I->getAlignment(S.Context);
1955 if (Align > OldAlign) {
1957 OldStrictestAlignAttr = I;
1961 // Look for alignas attributes on New.
1962 AlignedAttr *NewAlignasAttr = nullptr;
1963 unsigned NewAlign = 0;
1964 for (auto *I : New->specific_attrs<AlignedAttr>()) {
1965 if (I->isAlignmentDependent())
1971 unsigned Align = I->getAlignment(S.Context);
1972 if (Align > NewAlign)
1976 if (OldAlignasAttr && NewAlignasAttr && OldAlign != NewAlign) {
1977 // Both declarations have 'alignas' attributes. We require them to match.
1978 // C++11 [dcl.align]p6 and C11 6.7.5/7 both come close to saying this, but
1979 // fall short. (If two declarations both have alignas, they must both match
1980 // every definition, and so must match each other if there is a definition.)
1982 // If either declaration only contains 'alignas(0)' specifiers, then it
1983 // specifies the natural alignment for the type.
1984 if (OldAlign == 0 || NewAlign == 0) {
1986 if (ValueDecl *VD = dyn_cast<ValueDecl>(New))
1989 Ty = S.Context.getTagDeclType(cast<TagDecl>(New));
1992 OldAlign = S.Context.getTypeAlign(Ty);
1994 NewAlign = S.Context.getTypeAlign(Ty);
1997 if (OldAlign != NewAlign) {
1998 S.Diag(NewAlignasAttr->getLocation(), diag::err_alignas_mismatch)
1999 << (unsigned)S.Context.toCharUnitsFromBits(OldAlign).getQuantity()
2000 << (unsigned)S.Context.toCharUnitsFromBits(NewAlign).getQuantity();
2001 S.Diag(OldAlignasAttr->getLocation(), diag::note_previous_declaration);
2005 if (OldAlignasAttr && !NewAlignasAttr && isAttributeTargetADefinition(New)) {
2006 // C++11 [dcl.align]p6:
2007 // if any declaration of an entity has an alignment-specifier,
2008 // every defining declaration of that entity shall specify an
2009 // equivalent alignment.
2011 // If the definition of an object does not have an alignment
2012 // specifier, any other declaration of that object shall also
2013 // have no alignment specifier.
2014 S.Diag(New->getLocation(), diag::err_alignas_missing_on_definition)
2016 S.Diag(OldAlignasAttr->getLocation(), diag::note_alignas_on_declaration)
2020 bool AnyAdded = false;
2022 // Ensure we have an attribute representing the strictest alignment.
2023 if (OldAlign > NewAlign) {
2024 AlignedAttr *Clone = OldStrictestAlignAttr->clone(S.Context);
2025 Clone->setInherited(true);
2026 New->addAttr(Clone);
2030 // Ensure we have an alignas attribute if the old declaration had one.
2031 if (OldAlignasAttr && !NewAlignasAttr &&
2032 !(AnyAdded && OldStrictestAlignAttr->isAlignas())) {
2033 AlignedAttr *Clone = OldAlignasAttr->clone(S.Context);
2034 Clone->setInherited(true);
2035 New->addAttr(Clone);
2042 static bool mergeDeclAttribute(Sema &S, NamedDecl *D,
2043 const InheritableAttr *Attr, bool Override) {
2044 InheritableAttr *NewAttr = nullptr;
2045 unsigned AttrSpellingListIndex = Attr->getSpellingListIndex();
2046 if (const auto *AA = dyn_cast<AvailabilityAttr>(Attr))
2047 NewAttr = S.mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(),
2048 AA->getIntroduced(), AA->getDeprecated(),
2049 AA->getObsoleted(), AA->getUnavailable(),
2050 AA->getMessage(), Override,
2051 AttrSpellingListIndex);
2052 else if (const auto *VA = dyn_cast<VisibilityAttr>(Attr))
2053 NewAttr = S.mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
2054 AttrSpellingListIndex);
2055 else if (const auto *VA = dyn_cast<TypeVisibilityAttr>(Attr))
2056 NewAttr = S.mergeTypeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
2057 AttrSpellingListIndex);
2058 else if (const auto *ImportA = dyn_cast<DLLImportAttr>(Attr))
2059 NewAttr = S.mergeDLLImportAttr(D, ImportA->getRange(),
2060 AttrSpellingListIndex);
2061 else if (const auto *ExportA = dyn_cast<DLLExportAttr>(Attr))
2062 NewAttr = S.mergeDLLExportAttr(D, ExportA->getRange(),
2063 AttrSpellingListIndex);
2064 else if (const auto *FA = dyn_cast<FormatAttr>(Attr))
2065 NewAttr = S.mergeFormatAttr(D, FA->getRange(), FA->getType(),
2066 FA->getFormatIdx(), FA->getFirstArg(),
2067 AttrSpellingListIndex);
2068 else if (const auto *SA = dyn_cast<SectionAttr>(Attr))
2069 NewAttr = S.mergeSectionAttr(D, SA->getRange(), SA->getName(),
2070 AttrSpellingListIndex);
2071 else if (const auto *IA = dyn_cast<MSInheritanceAttr>(Attr))
2072 NewAttr = S.mergeMSInheritanceAttr(D, IA->getRange(), IA->getBestCase(),
2073 AttrSpellingListIndex,
2074 IA->getSemanticSpelling());
2075 else if (isa<AlignedAttr>(Attr))
2076 // AlignedAttrs are handled separately, because we need to handle all
2077 // such attributes on a declaration at the same time.
2079 else if (isa<DeprecatedAttr>(Attr) && Override)
2081 else if (Attr->duplicatesAllowed() || !DeclHasAttr(D, Attr))
2082 NewAttr = cast<InheritableAttr>(Attr->clone(S.Context));
2085 NewAttr->setInherited(true);
2086 D->addAttr(NewAttr);
2093 static const Decl *getDefinition(const Decl *D) {
2094 if (const TagDecl *TD = dyn_cast<TagDecl>(D))
2095 return TD->getDefinition();
2096 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
2097 const VarDecl *Def = VD->getDefinition();
2100 return VD->getActingDefinition();
2102 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2103 const FunctionDecl* Def;
2104 if (FD->isDefined(Def))
2110 static bool hasAttribute(const Decl *D, attr::Kind Kind) {
2111 for (const auto *Attribute : D->attrs())
2112 if (Attribute->getKind() == Kind)
2117 /// checkNewAttributesAfterDef - If we already have a definition, check that
2118 /// there are no new attributes in this declaration.
2119 static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) {
2120 if (!New->hasAttrs())
2123 const Decl *Def = getDefinition(Old);
2124 if (!Def || Def == New)
2127 AttrVec &NewAttributes = New->getAttrs();
2128 for (unsigned I = 0, E = NewAttributes.size(); I != E;) {
2129 const Attr *NewAttribute = NewAttributes[I];
2131 if (isa<AliasAttr>(NewAttribute)) {
2132 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(New))
2133 S.CheckForFunctionRedefinition(FD, cast<FunctionDecl>(Def));
2135 VarDecl *VD = cast<VarDecl>(New);
2136 unsigned Diag = cast<VarDecl>(Def)->isThisDeclarationADefinition() ==
2137 VarDecl::TentativeDefinition
2138 ? diag::err_alias_after_tentative
2139 : diag::err_redefinition;
2140 S.Diag(VD->getLocation(), Diag) << VD->getDeclName();
2141 S.Diag(Def->getLocation(), diag::note_previous_definition);
2142 VD->setInvalidDecl();
2148 if (const VarDecl *VD = dyn_cast<VarDecl>(Def)) {
2149 // Tentative definitions are only interesting for the alias check above.
2150 if (VD->isThisDeclarationADefinition() != VarDecl::Definition) {
2156 if (hasAttribute(Def, NewAttribute->getKind())) {
2158 continue; // regular attr merging will take care of validating this.
2161 if (isa<C11NoReturnAttr>(NewAttribute)) {
2162 // C's _Noreturn is allowed to be added to a function after it is defined.
2165 } else if (const AlignedAttr *AA = dyn_cast<AlignedAttr>(NewAttribute)) {
2166 if (AA->isAlignas()) {
2167 // C++11 [dcl.align]p6:
2168 // if any declaration of an entity has an alignment-specifier,
2169 // every defining declaration of that entity shall specify an
2170 // equivalent alignment.
2172 // If the definition of an object does not have an alignment
2173 // specifier, any other declaration of that object shall also
2174 // have no alignment specifier.
2175 S.Diag(Def->getLocation(), diag::err_alignas_missing_on_definition)
2177 S.Diag(NewAttribute->getLocation(), diag::note_alignas_on_declaration)
2179 NewAttributes.erase(NewAttributes.begin() + I);
2185 S.Diag(NewAttribute->getLocation(),
2186 diag::warn_attribute_precede_definition);
2187 S.Diag(Def->getLocation(), diag::note_previous_definition);
2188 NewAttributes.erase(NewAttributes.begin() + I);
2193 /// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
2194 void Sema::mergeDeclAttributes(NamedDecl *New, Decl *Old,
2195 AvailabilityMergeKind AMK) {
2196 if (UsedAttr *OldAttr = Old->getMostRecentDecl()->getAttr<UsedAttr>()) {
2197 UsedAttr *NewAttr = OldAttr->clone(Context);
2198 NewAttr->setInherited(true);
2199 New->addAttr(NewAttr);
2202 if (!Old->hasAttrs() && !New->hasAttrs())
2205 // attributes declared post-definition are currently ignored
2206 checkNewAttributesAfterDef(*this, New, Old);
2208 if (!Old->hasAttrs())
2211 bool foundAny = New->hasAttrs();
2213 // Ensure that any moving of objects within the allocated map is done before
2215 if (!foundAny) New->setAttrs(AttrVec());
2217 for (auto *I : Old->specific_attrs<InheritableAttr>()) {
2218 bool Override = false;
2219 // Ignore deprecated/unavailable/availability attributes if requested.
2220 if (isa<DeprecatedAttr>(I) ||
2221 isa<UnavailableAttr>(I) ||
2222 isa<AvailabilityAttr>(I)) {
2227 case AMK_Redeclaration:
2237 if (isa<UsedAttr>(I))
2240 if (mergeDeclAttribute(*this, New, I, Override))
2244 if (mergeAlignedAttrs(*this, New, Old))
2247 if (!foundAny) New->dropAttrs();
2250 /// mergeParamDeclAttributes - Copy attributes from the old parameter
2252 static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
2253 const ParmVarDecl *oldDecl,
2255 // C++11 [dcl.attr.depend]p2:
2256 // The first declaration of a function shall specify the
2257 // carries_dependency attribute for its declarator-id if any declaration
2258 // of the function specifies the carries_dependency attribute.
2259 const CarriesDependencyAttr *CDA = newDecl->getAttr<CarriesDependencyAttr>();
2260 if (CDA && !oldDecl->hasAttr<CarriesDependencyAttr>()) {
2261 S.Diag(CDA->getLocation(),
2262 diag::err_carries_dependency_missing_on_first_decl) << 1/*Param*/;
2263 // Find the first declaration of the parameter.
2264 // FIXME: Should we build redeclaration chains for function parameters?
2265 const FunctionDecl *FirstFD =
2266 cast<FunctionDecl>(oldDecl->getDeclContext())->getFirstDecl();
2267 const ParmVarDecl *FirstVD =
2268 FirstFD->getParamDecl(oldDecl->getFunctionScopeIndex());
2269 S.Diag(FirstVD->getLocation(),
2270 diag::note_carries_dependency_missing_first_decl) << 1/*Param*/;
2273 if (!oldDecl->hasAttrs())
2276 bool foundAny = newDecl->hasAttrs();
2278 // Ensure that any moving of objects within the allocated map is
2279 // done before we process them.
2280 if (!foundAny) newDecl->setAttrs(AttrVec());
2282 for (const auto *I : oldDecl->specific_attrs<InheritableParamAttr>()) {
2283 if (!DeclHasAttr(newDecl, I)) {
2284 InheritableAttr *newAttr =
2285 cast<InheritableParamAttr>(I->clone(S.Context));
2286 newAttr->setInherited(true);
2287 newDecl->addAttr(newAttr);
2292 if (!foundAny) newDecl->dropAttrs();
2297 /// Used in MergeFunctionDecl to keep track of function parameters in
2299 struct GNUCompatibleParamWarning {
2300 ParmVarDecl *OldParm;
2301 ParmVarDecl *NewParm;
2302 QualType PromotedType;
2307 /// getSpecialMember - get the special member enum for a method.
2308 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
2309 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
2310 if (Ctor->isDefaultConstructor())
2311 return Sema::CXXDefaultConstructor;
2313 if (Ctor->isCopyConstructor())
2314 return Sema::CXXCopyConstructor;
2316 if (Ctor->isMoveConstructor())
2317 return Sema::CXXMoveConstructor;
2318 } else if (isa<CXXDestructorDecl>(MD)) {
2319 return Sema::CXXDestructor;
2320 } else if (MD->isCopyAssignmentOperator()) {
2321 return Sema::CXXCopyAssignment;
2322 } else if (MD->isMoveAssignmentOperator()) {
2323 return Sema::CXXMoveAssignment;
2326 return Sema::CXXInvalid;
2329 // Determine whether the previous declaration was a definition, implicit
2330 // declaration, or a declaration.
2331 template <typename T>
2332 static std::pair<diag::kind, SourceLocation>
2333 getNoteDiagForInvalidRedeclaration(const T *Old, const T *New) {
2334 diag::kind PrevDiag;
2335 SourceLocation OldLocation = Old->getLocation();
2336 if (Old->isThisDeclarationADefinition())
2337 PrevDiag = diag::note_previous_definition;
2338 else if (Old->isImplicit()) {
2339 PrevDiag = diag::note_previous_implicit_declaration;
2340 if (OldLocation.isInvalid())
2341 OldLocation = New->getLocation();
2343 PrevDiag = diag::note_previous_declaration;
2344 return std::make_pair(PrevDiag, OldLocation);
2347 /// canRedefineFunction - checks if a function can be redefined. Currently,
2348 /// only extern inline functions can be redefined, and even then only in
2350 static bool canRedefineFunction(const FunctionDecl *FD,
2351 const LangOptions& LangOpts) {
2352 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
2353 !LangOpts.CPlusPlus &&
2354 FD->isInlineSpecified() &&
2355 FD->getStorageClass() == SC_Extern);
2358 const AttributedType *Sema::getCallingConvAttributedType(QualType T) const {
2359 const AttributedType *AT = T->getAs<AttributedType>();
2360 while (AT && !AT->isCallingConv())
2361 AT = AT->getModifiedType()->getAs<AttributedType>();
2365 template <typename T>
2366 static bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) {
2367 const DeclContext *DC = Old->getDeclContext();
2371 LanguageLinkage OldLinkage = Old->getLanguageLinkage();
2372 if (OldLinkage == CXXLanguageLinkage && New->isInExternCContext())
2374 if (OldLinkage == CLanguageLinkage && New->isInExternCXXContext())
2379 /// MergeFunctionDecl - We just parsed a function 'New' from
2380 /// declarator D which has the same name and scope as a previous
2381 /// declaration 'Old'. Figure out how to resolve this situation,
2382 /// merging decls or emitting diagnostics as appropriate.
2384 /// In C++, New and Old must be declarations that are not
2385 /// overloaded. Use IsOverload to determine whether New and Old are
2386 /// overloaded, and to select the Old declaration that New should be
2389 /// Returns true if there was an error, false otherwise.
2390 bool Sema::MergeFunctionDecl(FunctionDecl *New, NamedDecl *&OldD,
2391 Scope *S, bool MergeTypeWithOld) {
2392 // Verify the old decl was also a function.
2393 FunctionDecl *Old = OldD->getAsFunction();
2395 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
2396 if (New->getFriendObjectKind()) {
2397 Diag(New->getLocation(), diag::err_using_decl_friend);
2398 Diag(Shadow->getTargetDecl()->getLocation(),
2399 diag::note_using_decl_target);
2400 Diag(Shadow->getUsingDecl()->getLocation(),
2401 diag::note_using_decl) << 0;
2405 // C++11 [namespace.udecl]p14:
2406 // If a function declaration in namespace scope or block scope has the
2407 // same name and the same parameter-type-list as a function introduced
2408 // by a using-declaration, and the declarations do not declare the same
2409 // function, the program is ill-formed.
2411 // Check whether the two declarations might declare the same function.
2412 Old = dyn_cast<FunctionDecl>(Shadow->getTargetDecl());
2414 !Old->getDeclContext()->getRedeclContext()->Equals(
2415 New->getDeclContext()->getRedeclContext()) &&
2416 !(Old->isExternC() && New->isExternC()))
2420 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
2421 Diag(Shadow->getTargetDecl()->getLocation(),
2422 diag::note_using_decl_target);
2423 Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) << 0;
2428 Diag(New->getLocation(), diag::err_redefinition_different_kind)
2429 << New->getDeclName();
2430 Diag(OldD->getLocation(), diag::note_previous_definition);
2435 // If the old declaration is invalid, just give up here.
2436 if (Old->isInvalidDecl())
2439 diag::kind PrevDiag;
2440 SourceLocation OldLocation;
2441 std::tie(PrevDiag, OldLocation) =
2442 getNoteDiagForInvalidRedeclaration(Old, New);
2444 // Don't complain about this if we're in GNU89 mode and the old function
2445 // is an extern inline function.
2446 // Don't complain about specializations. They are not supposed to have
2448 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
2449 New->getStorageClass() == SC_Static &&
2450 Old->hasExternalFormalLinkage() &&
2451 !New->getTemplateSpecializationInfo() &&
2452 !canRedefineFunction(Old, getLangOpts())) {
2453 if (getLangOpts().MicrosoftExt) {
2454 Diag(New->getLocation(), diag::ext_static_non_static) << New;
2455 Diag(OldLocation, PrevDiag);
2457 Diag(New->getLocation(), diag::err_static_non_static) << New;
2458 Diag(OldLocation, PrevDiag);
2464 // If a function is first declared with a calling convention, but is later
2465 // declared or defined without one, all following decls assume the calling
2466 // convention of the first.
2468 // It's OK if a function is first declared without a calling convention,
2469 // but is later declared or defined with the default calling convention.
2471 // To test if either decl has an explicit calling convention, we look for
2472 // AttributedType sugar nodes on the type as written. If they are missing or
2473 // were canonicalized away, we assume the calling convention was implicit.
2475 // Note also that we DO NOT return at this point, because we still have
2476 // other tests to run.
2477 QualType OldQType = Context.getCanonicalType(Old->getType());
2478 QualType NewQType = Context.getCanonicalType(New->getType());
2479 const FunctionType *OldType = cast<FunctionType>(OldQType);
2480 const FunctionType *NewType = cast<FunctionType>(NewQType);
2481 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
2482 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
2483 bool RequiresAdjustment = false;
2485 if (OldTypeInfo.getCC() != NewTypeInfo.getCC()) {
2486 FunctionDecl *First = Old->getFirstDecl();
2487 const FunctionType *FT =
2488 First->getType().getCanonicalType()->castAs<FunctionType>();
2489 FunctionType::ExtInfo FI = FT->getExtInfo();
2490 bool NewCCExplicit = getCallingConvAttributedType(New->getType());
2491 if (!NewCCExplicit) {
2492 // Inherit the CC from the previous declaration if it was specified
2493 // there but not here.
2494 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
2495 RequiresAdjustment = true;
2497 // Calling conventions aren't compatible, so complain.
2498 bool FirstCCExplicit = getCallingConvAttributedType(First->getType());
2499 Diag(New->getLocation(), diag::err_cconv_change)
2500 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
2502 << (!FirstCCExplicit ? "" :
2503 FunctionType::getNameForCallConv(FI.getCC()));
2505 // Put the note on the first decl, since it is the one that matters.
2506 Diag(First->getLocation(), diag::note_previous_declaration);
2511 // FIXME: diagnose the other way around?
2512 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
2513 NewTypeInfo = NewTypeInfo.withNoReturn(true);
2514 RequiresAdjustment = true;
2517 // Merge regparm attribute.
2518 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
2519 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
2520 if (NewTypeInfo.getHasRegParm()) {
2521 Diag(New->getLocation(), diag::err_regparm_mismatch)
2522 << NewType->getRegParmType()
2523 << OldType->getRegParmType();
2524 Diag(OldLocation, diag::note_previous_declaration);
2528 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
2529 RequiresAdjustment = true;
2532 // Merge ns_returns_retained attribute.
2533 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
2534 if (NewTypeInfo.getProducesResult()) {
2535 Diag(New->getLocation(), diag::err_returns_retained_mismatch);
2536 Diag(OldLocation, diag::note_previous_declaration);
2540 NewTypeInfo = NewTypeInfo.withProducesResult(true);
2541 RequiresAdjustment = true;
2544 if (RequiresAdjustment) {
2545 const FunctionType *AdjustedType = New->getType()->getAs<FunctionType>();
2546 AdjustedType = Context.adjustFunctionType(AdjustedType, NewTypeInfo);
2547 New->setType(QualType(AdjustedType, 0));
2548 NewQType = Context.getCanonicalType(New->getType());
2549 NewType = cast<FunctionType>(NewQType);
2552 // If this redeclaration makes the function inline, we may need to add it to
2553 // UndefinedButUsed.
2554 if (!Old->isInlined() && New->isInlined() &&
2555 !New->hasAttr<GNUInlineAttr>() &&
2556 (getLangOpts().CPlusPlus || !getLangOpts().GNUInline) &&
2557 Old->isUsed(false) &&
2558 !Old->isDefined() && !New->isThisDeclarationADefinition())
2559 UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(),
2562 // If this redeclaration makes it newly gnu_inline, we don't want to warn
2564 if (New->hasAttr<GNUInlineAttr>() &&
2565 Old->isInlined() && !Old->hasAttr<GNUInlineAttr>()) {
2566 UndefinedButUsed.erase(Old->getCanonicalDecl());
2569 if (getLangOpts().CPlusPlus) {
2571 // Certain function declarations cannot be overloaded:
2572 // -- Function declarations that differ only in the return type
2573 // cannot be overloaded.
2575 // Go back to the type source info to compare the declared return types,
2576 // per C++1y [dcl.type.auto]p13:
2577 // Redeclarations or specializations of a function or function template
2578 // with a declared return type that uses a placeholder type shall also
2579 // use that placeholder, not a deduced type.
2580 QualType OldDeclaredReturnType =
2581 (Old->getTypeSourceInfo()
2582 ? Old->getTypeSourceInfo()->getType()->castAs<FunctionType>()
2583 : OldType)->getReturnType();
2584 QualType NewDeclaredReturnType =
2585 (New->getTypeSourceInfo()
2586 ? New->getTypeSourceInfo()->getType()->castAs<FunctionType>()
2587 : NewType)->getReturnType();
2589 if (!Context.hasSameType(OldDeclaredReturnType, NewDeclaredReturnType) &&
2590 !((NewQType->isDependentType() || OldQType->isDependentType()) &&
2591 New->isLocalExternDecl())) {
2592 if (NewDeclaredReturnType->isObjCObjectPointerType() &&
2593 OldDeclaredReturnType->isObjCObjectPointerType())
2594 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
2595 if (ResQT.isNull()) {
2596 if (New->isCXXClassMember() && New->isOutOfLine())
2597 Diag(New->getLocation(), diag::err_member_def_does_not_match_ret_type)
2598 << New << New->getReturnTypeSourceRange();
2600 Diag(New->getLocation(), diag::err_ovl_diff_return_type)
2601 << New->getReturnTypeSourceRange();
2602 Diag(OldLocation, PrevDiag) << Old << Old->getType()
2603 << Old->getReturnTypeSourceRange();
2610 QualType OldReturnType = OldType->getReturnType();
2611 QualType NewReturnType = cast<FunctionType>(NewQType)->getReturnType();
2612 if (OldReturnType != NewReturnType) {
2613 // If this function has a deduced return type and has already been
2614 // defined, copy the deduced value from the old declaration.
2615 AutoType *OldAT = Old->getReturnType()->getContainedAutoType();
2616 if (OldAT && OldAT->isDeduced()) {
2618 SubstAutoType(New->getType(),
2619 OldAT->isDependentType() ? Context.DependentTy
2620 : OldAT->getDeducedType()));
2621 NewQType = Context.getCanonicalType(
2622 SubstAutoType(NewQType,
2623 OldAT->isDependentType() ? Context.DependentTy
2624 : OldAT->getDeducedType()));
2628 const CXXMethodDecl *OldMethod = dyn_cast<CXXMethodDecl>(Old);
2629 CXXMethodDecl *NewMethod = dyn_cast<CXXMethodDecl>(New);
2630 if (OldMethod && NewMethod) {
2631 // Preserve triviality.
2632 NewMethod->setTrivial(OldMethod->isTrivial());
2634 // MSVC allows explicit template specialization at class scope:
2635 // 2 CXXMethodDecls referring to the same function will be injected.
2636 // We don't want a redeclaration error.
2637 bool IsClassScopeExplicitSpecialization =
2638 OldMethod->isFunctionTemplateSpecialization() &&
2639 NewMethod->isFunctionTemplateSpecialization();
2640 bool isFriend = NewMethod->getFriendObjectKind();
2642 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
2643 !IsClassScopeExplicitSpecialization) {
2644 // -- Member function declarations with the same name and the
2645 // same parameter types cannot be overloaded if any of them
2646 // is a static member function declaration.
2647 if (OldMethod->isStatic() != NewMethod->isStatic()) {
2648 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
2649 Diag(OldLocation, PrevDiag) << Old << Old->getType();
2653 // C++ [class.mem]p1:
2654 // [...] A member shall not be declared twice in the
2655 // member-specification, except that a nested class or member
2656 // class template can be declared and then later defined.
2657 if (ActiveTemplateInstantiations.empty()) {
2659 if (isa<CXXConstructorDecl>(OldMethod))
2660 NewDiag = diag::err_constructor_redeclared;
2661 else if (isa<CXXDestructorDecl>(NewMethod))
2662 NewDiag = diag::err_destructor_redeclared;
2663 else if (isa<CXXConversionDecl>(NewMethod))
2664 NewDiag = diag::err_conv_function_redeclared;
2666 NewDiag = diag::err_member_redeclared;
2668 Diag(New->getLocation(), NewDiag);
2670 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation)
2671 << New << New->getType();
2673 Diag(OldLocation, PrevDiag) << Old << Old->getType();
2675 // Complain if this is an explicit declaration of a special
2676 // member that was initially declared implicitly.
2678 // As an exception, it's okay to befriend such methods in order
2679 // to permit the implicit constructor/destructor/operator calls.
2680 } else if (OldMethod->isImplicit()) {
2682 NewMethod->setImplicit();
2684 Diag(NewMethod->getLocation(),
2685 diag::err_definition_of_implicitly_declared_member)
2686 << New << getSpecialMember(OldMethod);
2689 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) {
2690 Diag(NewMethod->getLocation(),
2691 diag::err_definition_of_explicitly_defaulted_member)
2692 << getSpecialMember(OldMethod);
2697 // C++11 [dcl.attr.noreturn]p1:
2698 // The first declaration of a function shall specify the noreturn
2699 // attribute if any declaration of that function specifies the noreturn
2701 const CXX11NoReturnAttr *NRA = New->getAttr<CXX11NoReturnAttr>();
2702 if (NRA && !Old->hasAttr<CXX11NoReturnAttr>()) {
2703 Diag(NRA->getLocation(), diag::err_noreturn_missing_on_first_decl);
2704 Diag(Old->getFirstDecl()->getLocation(),
2705 diag::note_noreturn_missing_first_decl);
2708 // C++11 [dcl.attr.depend]p2:
2709 // The first declaration of a function shall specify the
2710 // carries_dependency attribute for its declarator-id if any declaration
2711 // of the function specifies the carries_dependency attribute.
2712 const CarriesDependencyAttr *CDA = New->getAttr<CarriesDependencyAttr>();
2713 if (CDA && !Old->hasAttr<CarriesDependencyAttr>()) {
2714 Diag(CDA->getLocation(),
2715 diag::err_carries_dependency_missing_on_first_decl) << 0/*Function*/;
2716 Diag(Old->getFirstDecl()->getLocation(),
2717 diag::note_carries_dependency_missing_first_decl) << 0/*Function*/;
2721 // All declarations for a function shall agree exactly in both the
2722 // return type and the parameter-type-list.
2723 // We also want to respect all the extended bits except noreturn.
2725 // noreturn should now match unless the old type info didn't have it.
2726 QualType OldQTypeForComparison = OldQType;
2727 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
2728 assert(OldQType == QualType(OldType, 0));
2729 const FunctionType *OldTypeForComparison
2730 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
2731 OldQTypeForComparison = QualType(OldTypeForComparison, 0);
2732 assert(OldQTypeForComparison.isCanonical());
2735 if (haveIncompatibleLanguageLinkages(Old, New)) {
2736 // As a special case, retain the language linkage from previous
2737 // declarations of a friend function as an extension.
2739 // This liberal interpretation of C++ [class.friend]p3 matches GCC/MSVC
2740 // and is useful because there's otherwise no way to specify language
2741 // linkage within class scope.
2743 // Check cautiously as the friend object kind isn't yet complete.
2744 if (New->getFriendObjectKind() != Decl::FOK_None) {
2745 Diag(New->getLocation(), diag::ext_retained_language_linkage) << New;
2746 Diag(OldLocation, PrevDiag);
2748 Diag(New->getLocation(), diag::err_different_language_linkage) << New;
2749 Diag(OldLocation, PrevDiag);
2754 if (OldQTypeForComparison == NewQType)
2755 return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld);
2757 if ((NewQType->isDependentType() || OldQType->isDependentType()) &&
2758 New->isLocalExternDecl()) {
2759 // It's OK if we couldn't merge types for a local function declaraton
2760 // if either the old or new type is dependent. We'll merge the types
2761 // when we instantiate the function.
2765 // Fall through for conflicting redeclarations and redefinitions.
2768 // C: Function types need to be compatible, not identical. This handles
2769 // duplicate function decls like "void f(int); void f(enum X);" properly.
2770 if (!getLangOpts().CPlusPlus &&
2771 Context.typesAreCompatible(OldQType, NewQType)) {
2772 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
2773 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
2774 const FunctionProtoType *OldProto = nullptr;
2775 if (MergeTypeWithOld && isa<FunctionNoProtoType>(NewFuncType) &&
2776 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
2777 // The old declaration provided a function prototype, but the
2778 // new declaration does not. Merge in the prototype.
2779 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
2780 SmallVector<QualType, 16> ParamTypes(OldProto->param_types());
2782 Context.getFunctionType(NewFuncType->getReturnType(), ParamTypes,
2783 OldProto->getExtProtoInfo());
2784 New->setType(NewQType);
2785 New->setHasInheritedPrototype();
2787 // Synthesize parameters with the same types.
2788 SmallVector<ParmVarDecl*, 16> Params;
2789 for (const auto &ParamType : OldProto->param_types()) {
2790 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, SourceLocation(),
2791 SourceLocation(), nullptr,
2792 ParamType, /*TInfo=*/nullptr,
2794 Param->setScopeInfo(0, Params.size());
2795 Param->setImplicit();
2796 Params.push_back(Param);
2799 New->setParams(Params);
2802 return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld);
2805 // GNU C permits a K&R definition to follow a prototype declaration
2806 // if the declared types of the parameters in the K&R definition
2807 // match the types in the prototype declaration, even when the
2808 // promoted types of the parameters from the K&R definition differ
2809 // from the types in the prototype. GCC then keeps the types from
2812 // If a variadic prototype is followed by a non-variadic K&R definition,
2813 // the K&R definition becomes variadic. This is sort of an edge case, but
2814 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
2816 if (!getLangOpts().CPlusPlus &&
2817 Old->hasPrototype() && !New->hasPrototype() &&
2818 New->getType()->getAs<FunctionProtoType>() &&
2819 Old->getNumParams() == New->getNumParams()) {
2820 SmallVector<QualType, 16> ArgTypes;
2821 SmallVector<GNUCompatibleParamWarning, 16> Warnings;
2822 const FunctionProtoType *OldProto
2823 = Old->getType()->getAs<FunctionProtoType>();
2824 const FunctionProtoType *NewProto
2825 = New->getType()->getAs<FunctionProtoType>();
2827 // Determine whether this is the GNU C extension.
2828 QualType MergedReturn = Context.mergeTypes(OldProto->getReturnType(),
2829 NewProto->getReturnType());
2830 bool LooseCompatible = !MergedReturn.isNull();
2831 for (unsigned Idx = 0, End = Old->getNumParams();
2832 LooseCompatible && Idx != End; ++Idx) {
2833 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
2834 ParmVarDecl *NewParm = New->getParamDecl(Idx);
2835 if (Context.typesAreCompatible(OldParm->getType(),
2836 NewProto->getParamType(Idx))) {
2837 ArgTypes.push_back(NewParm->getType());
2838 } else if (Context.typesAreCompatible(OldParm->getType(),
2840 /*CompareUnqualified=*/true)) {
2841 GNUCompatibleParamWarning Warn = { OldParm, NewParm,
2842 NewProto->getParamType(Idx) };
2843 Warnings.push_back(Warn);
2844 ArgTypes.push_back(NewParm->getType());
2846 LooseCompatible = false;
2849 if (LooseCompatible) {
2850 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
2851 Diag(Warnings[Warn].NewParm->getLocation(),
2852 diag::ext_param_promoted_not_compatible_with_prototype)
2853 << Warnings[Warn].PromotedType
2854 << Warnings[Warn].OldParm->getType();
2855 if (Warnings[Warn].OldParm->getLocation().isValid())
2856 Diag(Warnings[Warn].OldParm->getLocation(),
2857 diag::note_previous_declaration);
2860 if (MergeTypeWithOld)
2861 New->setType(Context.getFunctionType(MergedReturn, ArgTypes,
2862 OldProto->getExtProtoInfo()));
2863 return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld);
2866 // Fall through to diagnose conflicting types.
2869 // A function that has already been declared has been redeclared or
2870 // defined with a different type; show an appropriate diagnostic.
2872 // If the previous declaration was an implicitly-generated builtin
2873 // declaration, then at the very least we should use a specialized note.
2875 if (Old->isImplicit() && (BuiltinID = Old->getBuiltinID())) {
2876 // If it's actually a library-defined builtin function like 'malloc'
2877 // or 'printf', just warn about the incompatible redeclaration.
2878 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
2879 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
2880 Diag(OldLocation, diag::note_previous_builtin_declaration)
2881 << Old << Old->getType();
2883 // If this is a global redeclaration, just forget hereafter
2884 // about the "builtin-ness" of the function.
2886 // Doing this for local extern declarations is problematic. If
2887 // the builtin declaration remains visible, a second invalid
2888 // local declaration will produce a hard error; if it doesn't
2889 // remain visible, a single bogus local redeclaration (which is
2890 // actually only a warning) could break all the downstream code.
2891 if (!New->getLexicalDeclContext()->isFunctionOrMethod())
2892 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
2897 PrevDiag = diag::note_previous_builtin_declaration;
2900 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
2901 Diag(OldLocation, PrevDiag) << Old << Old->getType();
2905 /// \brief Completes the merge of two function declarations that are
2906 /// known to be compatible.
2908 /// This routine handles the merging of attributes and other
2909 /// properties of function declarations from the old declaration to
2910 /// the new declaration, once we know that New is in fact a
2911 /// redeclaration of Old.
2914 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
2915 Scope *S, bool MergeTypeWithOld) {
2916 // Merge the attributes
2917 mergeDeclAttributes(New, Old);
2919 // Merge "pure" flag.
2923 // Merge "used" flag.
2924 if (Old->getMostRecentDecl()->isUsed(false))
2927 // Merge attributes from the parameters. These can mismatch with K&R
2929 if (New->getNumParams() == Old->getNumParams())
2930 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i)
2931 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i),
2934 if (getLangOpts().CPlusPlus)
2935 return MergeCXXFunctionDecl(New, Old, S);
2937 // Merge the function types so the we get the composite types for the return
2938 // and argument types. Per C11 6.2.7/4, only update the type if the old decl
2940 QualType Merged = Context.mergeTypes(Old->getType(), New->getType());
2941 if (!Merged.isNull() && MergeTypeWithOld)
2942 New->setType(Merged);
2948 void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
2949 ObjCMethodDecl *oldMethod) {
2951 // Merge the attributes, including deprecated/unavailable
2952 AvailabilityMergeKind MergeKind =
2953 isa<ObjCImplDecl>(newMethod->getDeclContext()) ? AMK_Redeclaration
2955 mergeDeclAttributes(newMethod, oldMethod, MergeKind);
2957 // Merge attributes from the parameters.
2958 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(),
2959 oe = oldMethod->param_end();
2960 for (ObjCMethodDecl::param_iterator
2961 ni = newMethod->param_begin(), ne = newMethod->param_end();
2962 ni != ne && oi != oe; ++ni, ++oi)
2963 mergeParamDeclAttributes(*ni, *oi, *this);
2965 CheckObjCMethodOverride(newMethod, oldMethod);
2968 /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
2969 /// scope as a previous declaration 'Old'. Figure out how to merge their types,
2970 /// emitting diagnostics as appropriate.
2972 /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
2973 /// to here in AddInitializerToDecl. We can't check them before the initializer
2975 void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old,
2976 bool MergeTypeWithOld) {
2977 if (New->isInvalidDecl() || Old->isInvalidDecl())
2981 if (getLangOpts().CPlusPlus) {
2982 if (New->getType()->isUndeducedType()) {
2983 // We don't know what the new type is until the initializer is attached.
2985 } else if (Context.hasSameType(New->getType(), Old->getType())) {
2986 // These could still be something that needs exception specs checked.
2987 return MergeVarDeclExceptionSpecs(New, Old);
2989 // C++ [basic.link]p10:
2990 // [...] the types specified by all declarations referring to a given
2991 // object or function shall be identical, except that declarations for an
2992 // array object can specify array types that differ by the presence or
2993 // absence of a major array bound (8.3.4).
2994 else if (Old->getType()->isIncompleteArrayType() &&
2995 New->getType()->isArrayType()) {
2996 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
2997 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
2998 if (Context.hasSameType(OldArray->getElementType(),
2999 NewArray->getElementType()))
3000 MergedT = New->getType();
3001 } else if (Old->getType()->isArrayType() &&
3002 New->getType()->isIncompleteArrayType()) {
3003 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
3004 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
3005 if (Context.hasSameType(OldArray->getElementType(),
3006 NewArray->getElementType()))
3007 MergedT = Old->getType();
3008 } else if (New->getType()->isObjCObjectPointerType() &&
3009 Old->getType()->isObjCObjectPointerType()) {
3010 MergedT = Context.mergeObjCGCQualifiers(New->getType(),
3015 // All declarations that refer to the same object or function shall have
3017 MergedT = Context.mergeTypes(New->getType(), Old->getType());
3019 if (MergedT.isNull()) {
3020 // It's OK if we couldn't merge types if either type is dependent, for a
3021 // block-scope variable. In other cases (static data members of class
3022 // templates, variable templates, ...), we require the types to be
3024 // FIXME: The C++ standard doesn't say anything about this.
3025 if ((New->getType()->isDependentType() ||
3026 Old->getType()->isDependentType()) && New->isLocalVarDecl()) {
3027 // If the old type was dependent, we can't merge with it, so the new type
3028 // becomes dependent for now. We'll reproduce the original type when we
3029 // instantiate the TypeSourceInfo for the variable.
3030 if (!New->getType()->isDependentType() && MergeTypeWithOld)
3031 New->setType(Context.DependentTy);
3035 // FIXME: Even if this merging succeeds, some other non-visible declaration
3036 // of this variable might have an incompatible type. For instance:
3038 // extern int arr[];
3039 // void f() { extern int arr[2]; }
3040 // void g() { extern int arr[3]; }
3042 // Neither C nor C++ requires a diagnostic for this, but we should still try
3044 Diag(New->getLocation(), diag::err_redefinition_different_type)
3045 << New->getDeclName() << New->getType() << Old->getType();
3046 Diag(Old->getLocation(), diag::note_previous_definition);
3047 return New->setInvalidDecl();
3050 // Don't actually update the type on the new declaration if the old
3051 // declaration was an extern declaration in a different scope.
3052 if (MergeTypeWithOld)
3053 New->setType(MergedT);
3056 static bool mergeTypeWithPrevious(Sema &S, VarDecl *NewVD, VarDecl *OldVD,
3057 LookupResult &Previous) {
3059 // For an identifier with internal or external linkage declared
3060 // in a scope in which a prior declaration of that identifier is
3061 // visible, if the prior declaration specifies internal or
3062 // external linkage, the type of the identifier at the later
3063 // declaration becomes the composite type.
3065 // If the variable isn't visible, we do not merge with its type.
3066 if (Previous.isShadowed())
3069 if (S.getLangOpts().CPlusPlus) {
3070 // C++11 [dcl.array]p3:
3071 // If there is a preceding declaration of the entity in the same
3072 // scope in which the bound was specified, an omitted array bound
3073 // is taken to be the same as in that earlier declaration.
3074 return NewVD->isPreviousDeclInSameBlockScope() ||
3075 (!OldVD->getLexicalDeclContext()->isFunctionOrMethod() &&
3076 !NewVD->getLexicalDeclContext()->isFunctionOrMethod());
3078 // If the old declaration was function-local, don't merge with its
3079 // type unless we're in the same function.
3080 return !OldVD->getLexicalDeclContext()->isFunctionOrMethod() ||
3081 OldVD->getLexicalDeclContext() == NewVD->getLexicalDeclContext();
3085 /// MergeVarDecl - We just parsed a variable 'New' which has the same name
3086 /// and scope as a previous declaration 'Old'. Figure out how to resolve this
3087 /// situation, merging decls or emitting diagnostics as appropriate.
3089 /// Tentative definition rules (C99 6.9.2p2) are checked by
3090 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
3091 /// definitions here, since the initializer hasn't been attached.
3093 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
3094 // If the new decl is already invalid, don't do any other checking.
3095 if (New->isInvalidDecl())
3098 VarTemplateDecl *NewTemplate = New->getDescribedVarTemplate();
3100 // Verify the old decl was also a variable or variable template.
3101 VarDecl *Old = nullptr;
3102 VarTemplateDecl *OldTemplate = nullptr;
3103 if (Previous.isSingleResult()) {
3105 OldTemplate = dyn_cast<VarTemplateDecl>(Previous.getFoundDecl());
3106 Old = OldTemplate ? OldTemplate->getTemplatedDecl() : nullptr;
3108 Old = dyn_cast<VarDecl>(Previous.getFoundDecl());
3111 Diag(New->getLocation(), diag::err_redefinition_different_kind)
3112 << New->getDeclName();
3113 Diag(Previous.getRepresentativeDecl()->getLocation(),
3114 diag::note_previous_definition);
3115 return New->setInvalidDecl();
3118 if (!shouldLinkPossiblyHiddenDecl(Old, New))
3121 // Ensure the template parameters are compatible.
3123 !TemplateParameterListsAreEqual(NewTemplate->getTemplateParameters(),
3124 OldTemplate->getTemplateParameters(),
3125 /*Complain=*/true, TPL_TemplateMatch))
3128 // C++ [class.mem]p1:
3129 // A member shall not be declared twice in the member-specification [...]
3131 // Here, we need only consider static data members.
3132 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
3133 Diag(New->getLocation(), diag::err_duplicate_member)
3134 << New->getIdentifier();
3135 Diag(Old->getLocation(), diag::note_previous_declaration);
3136 New->setInvalidDecl();
3139 mergeDeclAttributes(New, Old);
3140 // Warn if an already-declared variable is made a weak_import in a subsequent
3142 if (New->hasAttr<WeakImportAttr>() &&
3143 Old->getStorageClass() == SC_None &&
3144 !Old->hasAttr<WeakImportAttr>()) {
3145 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
3146 Diag(Old->getLocation(), diag::note_previous_definition);
3147 // Remove weak_import attribute on new declaration.
3148 New->dropAttr<WeakImportAttr>();
3152 MergeVarDeclTypes(New, Old, mergeTypeWithPrevious(*this, New, Old, Previous));
3154 if (New->isInvalidDecl())
3157 diag::kind PrevDiag;
3158 SourceLocation OldLocation;
3159 std::tie(PrevDiag, OldLocation) =
3160 getNoteDiagForInvalidRedeclaration(Old, New);
3162 // [dcl.stc]p8: Check if we have a non-static decl followed by a static.
3163 if (New->getStorageClass() == SC_Static &&
3164 !New->isStaticDataMember() &&
3165 Old->hasExternalFormalLinkage()) {
3166 if (getLangOpts().MicrosoftExt) {
3167 Diag(New->getLocation(), diag::ext_static_non_static)
3168 << New->getDeclName();
3169 Diag(OldLocation, PrevDiag);
3171 Diag(New->getLocation(), diag::err_static_non_static)
3172 << New->getDeclName();
3173 Diag(OldLocation, PrevDiag);
3174 return New->setInvalidDecl();
3178 // For an identifier declared with the storage-class specifier
3179 // extern in a scope in which a prior declaration of that
3180 // identifier is visible,23) if the prior declaration specifies
3181 // internal or external linkage, the linkage of the identifier at
3182 // the later declaration is the same as the linkage specified at
3183 // the prior declaration. If no prior declaration is visible, or
3184 // if the prior declaration specifies no linkage, then the
3185 // identifier has external linkage.
3186 if (New->hasExternalStorage() && Old->hasLinkage())
3188 else if (New->getCanonicalDecl()->getStorageClass() != SC_Static &&
3189 !New->isStaticDataMember() &&
3190 Old->getCanonicalDecl()->getStorageClass() == SC_Static) {
3191 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
3192 Diag(OldLocation, PrevDiag);
3193 return New->setInvalidDecl();
3196 // Check if extern is followed by non-extern and vice-versa.
3197 if (New->hasExternalStorage() &&
3198 !Old->hasLinkage() && Old->isLocalVarDecl()) {
3199 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
3200 Diag(OldLocation, PrevDiag);
3201 return New->setInvalidDecl();
3203 if (Old->hasLinkage() && New->isLocalVarDecl() &&
3204 !New->hasExternalStorage()) {
3205 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
3206 Diag(OldLocation, PrevDiag);
3207 return New->setInvalidDecl();
3210 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
3212 // FIXME: The test for external storage here seems wrong? We still
3213 // need to check for mismatches.
3214 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
3215 // Don't complain about out-of-line definitions of static members.
3216 !(Old->getLexicalDeclContext()->isRecord() &&
3217 !New->getLexicalDeclContext()->isRecord())) {
3218 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
3219 Diag(OldLocation, PrevDiag);
3220 return New->setInvalidDecl();
3223 if (New->getTLSKind() != Old->getTLSKind()) {
3224 if (!Old->getTLSKind()) {
3225 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
3226 Diag(OldLocation, PrevDiag);
3227 } else if (!New->getTLSKind()) {
3228 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
3229 Diag(OldLocation, PrevDiag);
3231 // Do not allow redeclaration to change the variable between requiring
3232 // static and dynamic initialization.
3233 // FIXME: GCC allows this, but uses the TLS keyword on the first
3234 // declaration to determine the kind. Do we need to be compatible here?
3235 Diag(New->getLocation(), diag::err_thread_thread_different_kind)
3236 << New->getDeclName() << (New->getTLSKind() == VarDecl::TLS_Dynamic);
3237 Diag(OldLocation, PrevDiag);
3241 // C++ doesn't have tentative definitions, so go right ahead and check here.
3243 if (getLangOpts().CPlusPlus &&
3244 New->isThisDeclarationADefinition() == VarDecl::Definition &&
3245 (Def = Old->getDefinition())) {
3246 Diag(New->getLocation(), diag::err_redefinition) << New;
3247 Diag(Def->getLocation(), diag::note_previous_definition);
3248 New->setInvalidDecl();
3252 if (haveIncompatibleLanguageLinkages(Old, New)) {
3253 Diag(New->getLocation(), diag::err_different_language_linkage) << New;
3254 Diag(OldLocation, PrevDiag);
3255 New->setInvalidDecl();
3259 // Merge "used" flag.
3260 if (Old->getMostRecentDecl()->isUsed(false))
3263 // Keep a chain of previous declarations.
3264 New->setPreviousDecl(Old);
3266 NewTemplate->setPreviousDecl(OldTemplate);
3268 // Inherit access appropriately.
3269 New->setAccess(Old->getAccess());
3271 NewTemplate->setAccess(New->getAccess());
3274 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
3275 /// no declarator (e.g. "struct foo;") is parsed.
3276 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
3278 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg());
3281 static void HandleTagNumbering(Sema &S, const TagDecl *Tag, Scope *TagScope) {
3282 if (!S.Context.getLangOpts().CPlusPlus)
3285 if (isa<CXXRecordDecl>(Tag->getParent())) {
3286 // If this tag is the direct child of a class, number it if
3288 if (!Tag->getName().empty() || Tag->getTypedefNameForAnonDecl())
3290 MangleNumberingContext &MCtx =
3291 S.Context.getManglingNumberContext(Tag->getParent());
3292 S.Context.setManglingNumber(
3293 Tag, MCtx.getManglingNumber(Tag, TagScope->getMSLocalManglingNumber()));
3297 // If this tag isn't a direct child of a class, number it if it is local.
3298 Decl *ManglingContextDecl;
3299 if (MangleNumberingContext *MCtx =
3300 S.getCurrentMangleNumberContext(Tag->getDeclContext(),
3301 ManglingContextDecl)) {
3302 S.Context.setManglingNumber(
3304 MCtx->getManglingNumber(Tag, TagScope->getMSLocalManglingNumber()));
3308 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
3309 /// no declarator (e.g. "struct foo;") is parsed. It also accepts template
3310 /// parameters to cope with template friend declarations.
3311 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
3313 MultiTemplateParamsArg TemplateParams,
3314 bool IsExplicitInstantiation) {
3315 Decl *TagD = nullptr;
3316 TagDecl *Tag = nullptr;
3317 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
3318 DS.getTypeSpecType() == DeclSpec::TST_struct ||
3319 DS.getTypeSpecType() == DeclSpec::TST_interface ||
3320 DS.getTypeSpecType() == DeclSpec::TST_union ||
3321 DS.getTypeSpecType() == DeclSpec::TST_enum) {
3322 TagD = DS.getRepAsDecl();
3324 if (!TagD) // We probably had an error
3327 // Note that the above type specs guarantee that the
3328 // type rep is a Decl, whereas in many of the others
3330 if (isa<TagDecl>(TagD))
3331 Tag = cast<TagDecl>(TagD);
3332 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD))
3333 Tag = CTD->getTemplatedDecl();
3337 HandleTagNumbering(*this, Tag, S);
3338 Tag->setFreeStanding();
3339 if (Tag->isInvalidDecl())
3343 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
3344 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
3345 // or incomplete types shall not be restrict-qualified."
3346 if (TypeQuals & DeclSpec::TQ_restrict)
3347 Diag(DS.getRestrictSpecLoc(),
3348 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
3349 << DS.getSourceRange();
3352 if (DS.isConstexprSpecified()) {
3353 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
3354 // and definitions of functions and variables.
3356 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
3357 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
3358 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
3359 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 :
3360 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4);
3362 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
3363 // Don't emit warnings after this error.
3367 DiagnoseFunctionSpecifiers(DS);
3369 if (DS.isFriendSpecified()) {
3370 // If we're dealing with a decl but not a TagDecl, assume that
3371 // whatever routines created it handled the friendship aspect.
3374 return ActOnFriendTypeDecl(S, DS, TemplateParams);
3377 CXXScopeSpec &SS = DS.getTypeSpecScope();
3378 bool IsExplicitSpecialization =
3379 !TemplateParams.empty() && TemplateParams.back()->size() == 0;
3380 if (Tag && SS.isNotEmpty() && !Tag->isCompleteDefinition() &&
3381 !IsExplicitInstantiation && !IsExplicitSpecialization) {
3382 // Per C++ [dcl.type.elab]p1, a class declaration cannot have a
3383 // nested-name-specifier unless it is an explicit instantiation
3384 // or an explicit specialization.
3385 // Per C++ [dcl.enum]p1, an opaque-enum-declaration can't either.
3386 Diag(SS.getBeginLoc(), diag::err_standalone_class_nested_name_specifier)
3387 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
3388 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
3389 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 :
3390 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4)
3395 // Track whether this decl-specifier declares anything.
3396 bool DeclaresAnything = true;
3398 // Handle anonymous struct definitions.
3399 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
3400 if (!Record->getDeclName() && Record->isCompleteDefinition() &&
3401 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
3402 if (getLangOpts().CPlusPlus ||
3403 Record->getDeclContext()->isRecord())
3404 return BuildAnonymousStructOrUnion(S, DS, AS, Record, Context.getPrintingPolicy());
3406 DeclaresAnything = false;
3410 // Check for Microsoft C extension: anonymous struct member.
3411 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus &&
3412 CurContext->isRecord() &&
3413 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
3414 // Handle 2 kinds of anonymous struct:
3417 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
3418 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag);
3419 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) ||
3420 (DS.getTypeSpecType() == DeclSpec::TST_typename &&
3421 DS.getRepAsType().get()->isStructureType())) {
3422 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct)
3423 << DS.getSourceRange();
3424 return BuildMicrosoftCAnonymousStruct(S, DS, Record);
3428 // Skip all the checks below if we have a type error.
3429 if (DS.getTypeSpecType() == DeclSpec::TST_error ||
3430 (TagD && TagD->isInvalidDecl()))
3433 if (getLangOpts().CPlusPlus &&
3434 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
3435 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
3436 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
3437 !Enum->getIdentifier() && !Enum->isInvalidDecl())
3438 DeclaresAnything = false;
3440 if (!DS.isMissingDeclaratorOk()) {
3441 // Customize diagnostic for a typedef missing a name.
3442 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
3443 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name)
3444 << DS.getSourceRange();
3446 DeclaresAnything = false;
3449 if (DS.isModulePrivateSpecified() &&
3450 Tag && Tag->getDeclContext()->isFunctionOrMethod())
3451 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
3452 << Tag->getTagKind()
3453 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
3455 ActOnDocumentableDecl(TagD);
3458 // A declaration [...] shall declare at least a declarator [...], a tag,
3459 // or the members of an enumeration.
3461 // [If there are no declarators], and except for the declaration of an
3462 // unnamed bit-field, the decl-specifier-seq shall introduce one or more
3463 // names into the program, or shall redeclare a name introduced by a
3464 // previous declaration.
3465 if (!DeclaresAnything) {
3466 // In C, we allow this as a (popular) extension / bug. Don't bother
3467 // producing further diagnostics for redundant qualifiers after this.
3468 Diag(DS.getLocStart(), diag::ext_no_declarators) << DS.getSourceRange();
3473 // If a storage-class-specifier appears in a decl-specifier-seq, [...] the
3474 // init-declarator-list of the declaration shall not be empty.
3475 // C++ [dcl.fct.spec]p1:
3476 // If a cv-qualifier appears in a decl-specifier-seq, the
3477 // init-declarator-list of the declaration shall not be empty.
3479 // Spurious qualifiers here appear to be valid in C.
3480 unsigned DiagID = diag::warn_standalone_specifier;
3481 if (getLangOpts().CPlusPlus)
3482 DiagID = diag::ext_standalone_specifier;
3484 // Note that a linkage-specification sets a storage class, but
3485 // 'extern "C" struct foo;' is actually valid and not theoretically
3487 if (DeclSpec::SCS SCS = DS.getStorageClassSpec()) {
3488 if (SCS == DeclSpec::SCS_mutable)
3489 // Since mutable is not a viable storage class specifier in C, there is
3490 // no reason to treat it as an extension. Instead, diagnose as an error.
3491 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_nonmember);
3492 else if (!DS.isExternInLinkageSpec() && SCS != DeclSpec::SCS_typedef)
3493 Diag(DS.getStorageClassSpecLoc(), DiagID)
3494 << DeclSpec::getSpecifierName(SCS);
3497 if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
3498 Diag(DS.getThreadStorageClassSpecLoc(), DiagID)
3499 << DeclSpec::getSpecifierName(TSCS);
3500 if (DS.getTypeQualifiers()) {
3501 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
3502 Diag(DS.getConstSpecLoc(), DiagID) << "const";
3503 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
3504 Diag(DS.getConstSpecLoc(), DiagID) << "volatile";
3505 // Restrict is covered above.
3506 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
3507 Diag(DS.getAtomicSpecLoc(), DiagID) << "_Atomic";
3510 // Warn about ignored type attributes, for example:
3511 // __attribute__((aligned)) struct A;
3512 // Attributes should be placed after tag to apply to type declaration.
3513 if (!DS.getAttributes().empty()) {
3514 DeclSpec::TST TypeSpecType = DS.getTypeSpecType();
3515 if (TypeSpecType == DeclSpec::TST_class ||
3516 TypeSpecType == DeclSpec::TST_struct ||
3517 TypeSpecType == DeclSpec::TST_interface ||
3518 TypeSpecType == DeclSpec::TST_union ||
3519 TypeSpecType == DeclSpec::TST_enum) {
3520 AttributeList* attrs = DS.getAttributes().getList();
3522 Diag(attrs->getLoc(), diag::warn_declspec_attribute_ignored)
3524 << (TypeSpecType == DeclSpec::TST_class ? 0 :
3525 TypeSpecType == DeclSpec::TST_struct ? 1 :
3526 TypeSpecType == DeclSpec::TST_union ? 2 :
3527 TypeSpecType == DeclSpec::TST_interface ? 3 : 4);
3528 attrs = attrs->getNext();
3536 /// We are trying to inject an anonymous member into the given scope;
3537 /// check if there's an existing declaration that can't be overloaded.
3539 /// \return true if this is a forbidden redeclaration
3540 static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
3543 DeclarationName Name,
3544 SourceLocation NameLoc,
3545 unsigned diagnostic) {
3546 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
3547 Sema::ForRedeclaration);
3548 if (!SemaRef.LookupName(R, S)) return false;
3550 if (R.getAsSingle<TagDecl>())
3553 // Pick a representative declaration.
3554 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
3555 assert(PrevDecl && "Expected a non-null Decl");
3557 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
3560 SemaRef.Diag(NameLoc, diagnostic) << Name;
3561 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
3566 /// InjectAnonymousStructOrUnionMembers - Inject the members of the
3567 /// anonymous struct or union AnonRecord into the owning context Owner
3568 /// and scope S. This routine will be invoked just after we realize
3569 /// that an unnamed union or struct is actually an anonymous union or
3576 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
3577 /// // f into the surrounding scope.x
3580 /// This routine is recursive, injecting the names of nested anonymous
3581 /// structs/unions into the owning context and scope as well.
3582 static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
3584 RecordDecl *AnonRecord,
3586 SmallVectorImpl<NamedDecl *> &Chaining,
3587 bool MSAnonStruct) {
3589 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
3590 : diag::err_anonymous_struct_member_redecl;
3592 bool Invalid = false;
3594 // Look every FieldDecl and IndirectFieldDecl with a name.
3595 for (auto *D : AnonRecord->decls()) {
3596 if ((isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) &&
3597 cast<NamedDecl>(D)->getDeclName()) {
3598 ValueDecl *VD = cast<ValueDecl>(D);
3599 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
3600 VD->getLocation(), diagKind)) {
3601 // C++ [class.union]p2:
3602 // The names of the members of an anonymous union shall be
3603 // distinct from the names of any other entity in the
3604 // scope in which the anonymous union is declared.
3607 // C++ [class.union]p2:
3608 // For the purpose of name lookup, after the anonymous union
3609 // definition, the members of the anonymous union are
3610 // considered to have been defined in the scope in which the
3611 // anonymous union is declared.
3612 unsigned OldChainingSize = Chaining.size();
3613 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
3614 for (auto *PI : IF->chain())
3615 Chaining.push_back(PI);
3617 Chaining.push_back(VD);
3619 assert(Chaining.size() >= 2);
3620 NamedDecl **NamedChain =
3621 new (SemaRef.Context)NamedDecl*[Chaining.size()];
3622 for (unsigned i = 0; i < Chaining.size(); i++)
3623 NamedChain[i] = Chaining[i];
3625 IndirectFieldDecl* IndirectField =
3626 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(),
3627 VD->getIdentifier(), VD->getType(),
3628 NamedChain, Chaining.size());
3630 IndirectField->setAccess(AS);
3631 IndirectField->setImplicit();
3632 SemaRef.PushOnScopeChains(IndirectField, S);
3634 // That includes picking up the appropriate access specifier.
3635 if (AS != AS_none) IndirectField->setAccess(AS);
3637 Chaining.resize(OldChainingSize);
3645 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
3646 /// a VarDecl::StorageClass. Any error reporting is up to the caller:
3647 /// illegal input values are mapped to SC_None.
3649 StorageClassSpecToVarDeclStorageClass(const DeclSpec &DS) {
3650 DeclSpec::SCS StorageClassSpec = DS.getStorageClassSpec();
3651 assert(StorageClassSpec != DeclSpec::SCS_typedef &&
3652 "Parser allowed 'typedef' as storage class VarDecl.");
3653 switch (StorageClassSpec) {
3654 case DeclSpec::SCS_unspecified: return SC_None;
3655 case DeclSpec::SCS_extern:
3656 if (DS.isExternInLinkageSpec())
3659 case DeclSpec::SCS_static: return SC_Static;
3660 case DeclSpec::SCS_auto: return SC_Auto;
3661 case DeclSpec::SCS_register: return SC_Register;
3662 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
3663 // Illegal SCSs map to None: error reporting is up to the caller.
3664 case DeclSpec::SCS_mutable: // Fall through.
3665 case DeclSpec::SCS_typedef: return SC_None;
3667 llvm_unreachable("unknown storage class specifier");
3670 static SourceLocation findDefaultInitializer(const CXXRecordDecl *Record) {
3671 assert(Record->hasInClassInitializer());
3673 for (const auto *I : Record->decls()) {
3674 const auto *FD = dyn_cast<FieldDecl>(I);
3675 if (const auto *IFD = dyn_cast<IndirectFieldDecl>(I))
3676 FD = IFD->getAnonField();
3677 if (FD && FD->hasInClassInitializer())
3678 return FD->getLocation();
3681 llvm_unreachable("couldn't find in-class initializer");
3684 static void checkDuplicateDefaultInit(Sema &S, CXXRecordDecl *Parent,
3685 SourceLocation DefaultInitLoc) {
3686 if (!Parent->isUnion() || !Parent->hasInClassInitializer())
3689 S.Diag(DefaultInitLoc, diag::err_multiple_mem_union_initialization);
3690 S.Diag(findDefaultInitializer(Parent), diag::note_previous_initializer) << 0;
3693 static void checkDuplicateDefaultInit(Sema &S, CXXRecordDecl *Parent,
3694 CXXRecordDecl *AnonUnion) {
3695 if (!Parent->isUnion() || !Parent->hasInClassInitializer())
3698 checkDuplicateDefaultInit(S, Parent, findDefaultInitializer(AnonUnion));
3701 /// BuildAnonymousStructOrUnion - Handle the declaration of an
3702 /// anonymous structure or union. Anonymous unions are a C++ feature
3703 /// (C++ [class.union]) and a C11 feature; anonymous structures
3704 /// are a C11 feature and GNU C++ extension.
3705 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
3708 const PrintingPolicy &Policy) {
3709 DeclContext *Owner = Record->getDeclContext();
3711 // Diagnose whether this anonymous struct/union is an extension.
3712 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11)
3713 Diag(Record->getLocation(), diag::ext_anonymous_union);
3714 else if (!Record->isUnion() && getLangOpts().CPlusPlus)
3715 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct);
3716 else if (!Record->isUnion() && !getLangOpts().C11)
3717 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct);
3719 // C and C++ require different kinds of checks for anonymous
3721 bool Invalid = false;
3722 if (getLangOpts().CPlusPlus) {
3723 const char *PrevSpec = nullptr;
3725 if (Record->isUnion()) {
3726 // C++ [class.union]p6:
3727 // Anonymous unions declared in a named namespace or in the
3728 // global namespace shall be declared static.
3729 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
3730 (isa<TranslationUnitDecl>(Owner) ||
3731 (isa<NamespaceDecl>(Owner) &&
3732 cast<NamespaceDecl>(Owner)->getDeclName()))) {
3733 Diag(Record->getLocation(), diag::err_anonymous_union_not_static)
3734 << FixItHint::CreateInsertion(Record->getLocation(), "static ");
3736 // Recover by adding 'static'.
3737 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
3738 PrevSpec, DiagID, Policy);
3740 // C++ [class.union]p6:
3741 // A storage class is not allowed in a declaration of an
3742 // anonymous union in a class scope.
3743 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
3744 isa<RecordDecl>(Owner)) {
3745 Diag(DS.getStorageClassSpecLoc(),
3746 diag::err_anonymous_union_with_storage_spec)
3747 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
3749 // Recover by removing the storage specifier.
3750 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified,
3752 PrevSpec, DiagID, Context.getPrintingPolicy());
3756 // Ignore const/volatile/restrict qualifiers.
3757 if (DS.getTypeQualifiers()) {
3758 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
3759 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
3760 << Record->isUnion() << "const"
3761 << FixItHint::CreateRemoval(DS.getConstSpecLoc());
3762 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
3763 Diag(DS.getVolatileSpecLoc(),
3764 diag::ext_anonymous_struct_union_qualified)
3765 << Record->isUnion() << "volatile"
3766 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
3767 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
3768 Diag(DS.getRestrictSpecLoc(),
3769 diag::ext_anonymous_struct_union_qualified)
3770 << Record->isUnion() << "restrict"
3771 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
3772 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
3773 Diag(DS.getAtomicSpecLoc(),
3774 diag::ext_anonymous_struct_union_qualified)
3775 << Record->isUnion() << "_Atomic"
3776 << FixItHint::CreateRemoval(DS.getAtomicSpecLoc());
3778 DS.ClearTypeQualifiers();
3781 // C++ [class.union]p2:
3782 // The member-specification of an anonymous union shall only
3783 // define non-static data members. [Note: nested types and
3784 // functions cannot be declared within an anonymous union. ]
3785 for (auto *Mem : Record->decls()) {
3786 if (auto *FD = dyn_cast<FieldDecl>(Mem)) {
3787 // C++ [class.union]p3:
3788 // An anonymous union shall not have private or protected
3789 // members (clause 11).
3790 assert(FD->getAccess() != AS_none);
3791 if (FD->getAccess() != AS_public) {
3792 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
3793 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
3797 // C++ [class.union]p1
3798 // An object of a class with a non-trivial constructor, a non-trivial
3799 // copy constructor, a non-trivial destructor, or a non-trivial copy
3800 // assignment operator cannot be a member of a union, nor can an
3801 // array of such objects.
3802 if (CheckNontrivialField(FD))
3804 } else if (Mem->isImplicit()) {
3805 // Any implicit members are fine.
3806 } else if (isa<TagDecl>(Mem) && Mem->getDeclContext() != Record) {
3807 // This is a type that showed up in an
3808 // elaborated-type-specifier inside the anonymous struct or
3809 // union, but which actually declares a type outside of the
3810 // anonymous struct or union. It's okay.
3811 } else if (auto *MemRecord = dyn_cast<RecordDecl>(Mem)) {
3812 if (!MemRecord->isAnonymousStructOrUnion() &&
3813 MemRecord->getDeclName()) {
3814 // Visual C++ allows type definition in anonymous struct or union.
3815 if (getLangOpts().MicrosoftExt)
3816 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
3817 << (int)Record->isUnion();
3819 // This is a nested type declaration.
3820 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
3821 << (int)Record->isUnion();
3825 // This is an anonymous type definition within another anonymous type.
3826 // This is a popular extension, provided by Plan9, MSVC and GCC, but
3827 // not part of standard C++.
3828 Diag(MemRecord->getLocation(),
3829 diag::ext_anonymous_record_with_anonymous_type)
3830 << (int)Record->isUnion();
3832 } else if (isa<AccessSpecDecl>(Mem)) {
3833 // Any access specifier is fine.
3834 } else if (isa<StaticAssertDecl>(Mem)) {
3835 // In C++1z, static_assert declarations are also fine.
3837 // We have something that isn't a non-static data
3838 // member. Complain about it.
3839 unsigned DK = diag::err_anonymous_record_bad_member;
3840 if (isa<TypeDecl>(Mem))
3841 DK = diag::err_anonymous_record_with_type;
3842 else if (isa<FunctionDecl>(Mem))
3843 DK = diag::err_anonymous_record_with_function;
3844 else if (isa<VarDecl>(Mem))
3845 DK = diag::err_anonymous_record_with_static;
3847 // Visual C++ allows type definition in anonymous struct or union.
3848 if (getLangOpts().MicrosoftExt &&
3849 DK == diag::err_anonymous_record_with_type)
3850 Diag(Mem->getLocation(), diag::ext_anonymous_record_with_type)
3851 << (int)Record->isUnion();
3853 Diag(Mem->getLocation(), DK)
3854 << (int)Record->isUnion();
3860 // C++11 [class.union]p8 (DR1460):
3861 // At most one variant member of a union may have a
3862 // brace-or-equal-initializer.
3863 if (cast<CXXRecordDecl>(Record)->hasInClassInitializer() &&
3865 checkDuplicateDefaultInit(*this, cast<CXXRecordDecl>(Owner),
3866 cast<CXXRecordDecl>(Record));
3869 if (!Record->isUnion() && !Owner->isRecord()) {
3870 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
3871 << (int)getLangOpts().CPlusPlus;
3875 // Mock up a declarator.
3876 Declarator Dc(DS, Declarator::MemberContext);
3877 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
3878 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
3880 // Create a declaration for this anonymous struct/union.
3881 NamedDecl *Anon = nullptr;
3882 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
3883 Anon = FieldDecl::Create(Context, OwningClass,
3885 Record->getLocation(),
3886 /*IdentifierInfo=*/nullptr,
3887 Context.getTypeDeclType(Record),
3889 /*BitWidth=*/nullptr, /*Mutable=*/false,
3890 /*InitStyle=*/ICIS_NoInit);
3891 Anon->setAccess(AS);
3892 if (getLangOpts().CPlusPlus)
3893 FieldCollector->Add(cast<FieldDecl>(Anon));
3895 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
3896 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(DS);
3897 if (SCSpec == DeclSpec::SCS_mutable) {
3898 // mutable can only appear on non-static class members, so it's always
3900 Diag(Record->getLocation(), diag::err_mutable_nonmember);
3905 Anon = VarDecl::Create(Context, Owner,
3907 Record->getLocation(), /*IdentifierInfo=*/nullptr,
3908 Context.getTypeDeclType(Record),
3911 // Default-initialize the implicit variable. This initialization will be
3912 // trivial in almost all cases, except if a union member has an in-class
3914 // union { int n = 0; };
3915 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
3917 Anon->setImplicit();
3919 // Mark this as an anonymous struct/union type.
3920 Record->setAnonymousStructOrUnion(true);
3922 // Add the anonymous struct/union object to the current
3923 // context. We'll be referencing this object when we refer to one of
3925 Owner->addDecl(Anon);
3927 // Inject the members of the anonymous struct/union into the owning
3928 // context and into the identifier resolver chain for name lookup
3930 SmallVector<NamedDecl*, 2> Chain;
3931 Chain.push_back(Anon);
3933 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS,
3937 if (VarDecl *NewVD = dyn_cast<VarDecl>(Anon)) {
3938 if (getLangOpts().CPlusPlus && NewVD->isStaticLocal()) {
3939 Decl *ManglingContextDecl;
3940 if (MangleNumberingContext *MCtx =
3941 getCurrentMangleNumberContext(NewVD->getDeclContext(),
3942 ManglingContextDecl)) {
3943 Context.setManglingNumber(NewVD, MCtx->getManglingNumber(NewVD, S->getMSLocalManglingNumber()));
3944 Context.setStaticLocalNumber(NewVD, MCtx->getStaticLocalNumber(NewVD));
3950 Anon->setInvalidDecl();
3955 /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
3956 /// Microsoft C anonymous structure.
3957 /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
3960 /// struct A { int a; };
3961 /// struct B { struct A; int b; };
3968 Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
3969 RecordDecl *Record) {
3971 // If there is no Record, get the record via the typedef.
3973 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl();
3975 // Mock up a declarator.
3976 Declarator Dc(DS, Declarator::TypeNameContext);
3977 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
3978 assert(TInfo && "couldn't build declarator info for anonymous struct");
3980 // Create a declaration for this anonymous struct.
3981 NamedDecl *Anon = FieldDecl::Create(Context,
3982 cast<RecordDecl>(CurContext),
3985 /*IdentifierInfo=*/nullptr,
3986 Context.getTypeDeclType(Record),
3988 /*BitWidth=*/nullptr, /*Mutable=*/false,
3989 /*InitStyle=*/ICIS_NoInit);
3990 Anon->setImplicit();
3992 // Add the anonymous struct object to the current context.
3993 CurContext->addDecl(Anon);
3995 // Inject the members of the anonymous struct into the current
3996 // context and into the identifier resolver chain for name lookup
3998 SmallVector<NamedDecl*, 2> Chain;
3999 Chain.push_back(Anon);
4001 RecordDecl *RecordDef = Record->getDefinition();
4002 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext,
4005 Anon->setInvalidDecl();
4010 /// GetNameForDeclarator - Determine the full declaration name for the
4011 /// given Declarator.
4012 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
4013 return GetNameFromUnqualifiedId(D.getName());
4016 /// \brief Retrieves the declaration name from a parsed unqualified-id.
4018 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
4019 DeclarationNameInfo NameInfo;
4020 NameInfo.setLoc(Name.StartLocation);
4022 switch (Name.getKind()) {
4024 case UnqualifiedId::IK_ImplicitSelfParam:
4025 case UnqualifiedId::IK_Identifier:
4026 NameInfo.setName(Name.Identifier);
4027 NameInfo.setLoc(Name.StartLocation);
4030 case UnqualifiedId::IK_OperatorFunctionId:
4031 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
4032 Name.OperatorFunctionId.Operator));
4033 NameInfo.setLoc(Name.StartLocation);
4034 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
4035 = Name.OperatorFunctionId.SymbolLocations[0];
4036 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
4037 = Name.EndLocation.getRawEncoding();
4040 case UnqualifiedId::IK_LiteralOperatorId:
4041 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
4043 NameInfo.setLoc(Name.StartLocation);
4044 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
4047 case UnqualifiedId::IK_ConversionFunctionId: {
4048 TypeSourceInfo *TInfo;
4049 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
4051 return DeclarationNameInfo();
4052 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
4053 Context.getCanonicalType(Ty)));
4054 NameInfo.setLoc(Name.StartLocation);
4055 NameInfo.setNamedTypeInfo(TInfo);
4059 case UnqualifiedId::IK_ConstructorName: {
4060 TypeSourceInfo *TInfo;
4061 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
4063 return DeclarationNameInfo();
4064 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
4065 Context.getCanonicalType(Ty)));
4066 NameInfo.setLoc(Name.StartLocation);
4067 NameInfo.setNamedTypeInfo(TInfo);
4071 case UnqualifiedId::IK_ConstructorTemplateId: {
4072 // In well-formed code, we can only have a constructor
4073 // template-id that refers to the current context, so go there
4074 // to find the actual type being constructed.
4075 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
4076 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
4077 return DeclarationNameInfo();
4079 // Determine the type of the class being constructed.
4080 QualType CurClassType = Context.getTypeDeclType(CurClass);
4082 // FIXME: Check two things: that the template-id names the same type as
4083 // CurClassType, and that the template-id does not occur when the name
4086 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
4087 Context.getCanonicalType(CurClassType)));
4088 NameInfo.setLoc(Name.StartLocation);
4089 // FIXME: should we retrieve TypeSourceInfo?
4090 NameInfo.setNamedTypeInfo(nullptr);
4094 case UnqualifiedId::IK_DestructorName: {
4095 TypeSourceInfo *TInfo;
4096 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
4098 return DeclarationNameInfo();
4099 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
4100 Context.getCanonicalType(Ty)));
4101 NameInfo.setLoc(Name.StartLocation);
4102 NameInfo.setNamedTypeInfo(TInfo);
4106 case UnqualifiedId::IK_TemplateId: {
4107 TemplateName TName = Name.TemplateId->Template.get();
4108 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
4109 return Context.getNameForTemplate(TName, TNameLoc);
4112 } // switch (Name.getKind())
4114 llvm_unreachable("Unknown name kind");
4117 static QualType getCoreType(QualType Ty) {
4119 if (Ty->isPointerType() || Ty->isReferenceType())
4120 Ty = Ty->getPointeeType();
4121 else if (Ty->isArrayType())
4122 Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
4124 return Ty.withoutLocalFastQualifiers();
4128 /// hasSimilarParameters - Determine whether the C++ functions Declaration
4129 /// and Definition have "nearly" matching parameters. This heuristic is
4130 /// used to improve diagnostics in the case where an out-of-line function
4131 /// definition doesn't match any declaration within the class or namespace.
4132 /// Also sets Params to the list of indices to the parameters that differ
4133 /// between the declaration and the definition. If hasSimilarParameters
4134 /// returns true and Params is empty, then all of the parameters match.
4135 static bool hasSimilarParameters(ASTContext &Context,
4136 FunctionDecl *Declaration,
4137 FunctionDecl *Definition,
4138 SmallVectorImpl<unsigned> &Params) {
4140 if (Declaration->param_size() != Definition->param_size())
4142 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
4143 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
4144 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
4146 // The parameter types are identical
4147 if (Context.hasSameType(DefParamTy, DeclParamTy))
4150 QualType DeclParamBaseTy = getCoreType(DeclParamTy);
4151 QualType DefParamBaseTy = getCoreType(DefParamTy);
4152 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
4153 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
4155 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
4156 (DeclTyName && DeclTyName == DefTyName))
4157 Params.push_back(Idx);
4158 else // The two parameters aren't even close
4165 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given
4166 /// declarator needs to be rebuilt in the current instantiation.
4167 /// Any bits of declarator which appear before the name are valid for
4168 /// consideration here. That's specifically the type in the decl spec
4169 /// and the base type in any member-pointer chunks.
4170 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
4171 DeclarationName Name) {
4172 // The types we specifically need to rebuild are:
4173 // - typenames, typeofs, and decltypes
4174 // - types which will become injected class names
4175 // Of course, we also need to rebuild any type referencing such a
4176 // type. It's safest to just say "dependent", but we call out a
4179 DeclSpec &DS = D.getMutableDeclSpec();
4180 switch (DS.getTypeSpecType()) {
4181 case DeclSpec::TST_typename:
4182 case DeclSpec::TST_typeofType:
4183 case DeclSpec::TST_underlyingType:
4184 case DeclSpec::TST_atomic: {
4185 // Grab the type from the parser.
4186 TypeSourceInfo *TSI = nullptr;
4187 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
4188 if (T.isNull() || !T->isDependentType()) break;
4190 // Make sure there's a type source info. This isn't really much
4191 // of a waste; most dependent types should have type source info
4192 // attached already.
4194 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
4196 // Rebuild the type in the current instantiation.
4197 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
4198 if (!TSI) return true;
4200 // Store the new type back in the decl spec.
4201 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
4202 DS.UpdateTypeRep(LocType);
4206 case DeclSpec::TST_decltype:
4207 case DeclSpec::TST_typeofExpr: {
4208 Expr *E = DS.getRepAsExpr();
4209 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
4210 if (Result.isInvalid()) return true;
4211 DS.UpdateExprRep(Result.get());
4216 // Nothing to do for these decl specs.
4220 // It doesn't matter what order we do this in.
4221 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
4222 DeclaratorChunk &Chunk = D.getTypeObject(I);
4224 // The only type information in the declarator which can come
4225 // before the declaration name is the base type of a member
4227 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
4230 // Rebuild the scope specifier in-place.
4231 CXXScopeSpec &SS = Chunk.Mem.Scope();
4232 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
4239 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
4240 D.setFunctionDefinitionKind(FDK_Declaration);
4241 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg());
4243 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() &&
4244 Dcl && Dcl->getDeclContext()->isFileContext())
4245 Dcl->setTopLevelDeclInObjCContainer();
4250 /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
4251 /// If T is the name of a class, then each of the following shall have a
4252 /// name different from T:
4253 /// - every static data member of class T;
4254 /// - every member function of class T
4255 /// - every member of class T that is itself a type;
4256 /// \returns true if the declaration name violates these rules.
4257 bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
4258 DeclarationNameInfo NameInfo) {
4259 DeclarationName Name = NameInfo.getName();
4261 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC))
4262 if (Record->getIdentifier() && Record->getDeclName() == Name) {
4263 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
4270 /// \brief Diagnose a declaration whose declarator-id has the given
4271 /// nested-name-specifier.
4273 /// \param SS The nested-name-specifier of the declarator-id.
4275 /// \param DC The declaration context to which the nested-name-specifier
4278 /// \param Name The name of the entity being declared.
4280 /// \param Loc The location of the name of the entity being declared.
4282 /// \returns true if we cannot safely recover from this error, false otherwise.
4283 bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
4284 DeclarationName Name,
4285 SourceLocation Loc) {
4286 DeclContext *Cur = CurContext;
4287 while (isa<LinkageSpecDecl>(Cur) || isa<CapturedDecl>(Cur))
4288 Cur = Cur->getParent();
4290 // If the user provided a superfluous scope specifier that refers back to the
4291 // class in which the entity is already declared, diagnose and ignore it.
4297 // Note, it was once ill-formed to give redundant qualification in all
4298 // contexts, but that rule was removed by DR482.
4299 if (Cur->Equals(DC)) {
4300 if (Cur->isRecord()) {
4301 Diag(Loc, LangOpts.MicrosoftExt ? diag::warn_member_extra_qualification
4302 : diag::err_member_extra_qualification)
4303 << Name << FixItHint::CreateRemoval(SS.getRange());
4306 Diag(Loc, diag::warn_namespace_member_extra_qualification) << Name;
4311 // Check whether the qualifying scope encloses the scope of the original
4313 if (!Cur->Encloses(DC)) {
4314 if (Cur->isRecord())
4315 Diag(Loc, diag::err_member_qualification)
4316 << Name << SS.getRange();
4317 else if (isa<TranslationUnitDecl>(DC))
4318 Diag(Loc, diag::err_invalid_declarator_global_scope)
4319 << Name << SS.getRange();
4320 else if (isa<FunctionDecl>(Cur))
4321 Diag(Loc, diag::err_invalid_declarator_in_function)
4322 << Name << SS.getRange();
4323 else if (isa<BlockDecl>(Cur))
4324 Diag(Loc, diag::err_invalid_declarator_in_block)
4325 << Name << SS.getRange();
4327 Diag(Loc, diag::err_invalid_declarator_scope)
4328 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange();
4333 if (Cur->isRecord()) {
4334 // Cannot qualify members within a class.
4335 Diag(Loc, diag::err_member_qualification)
4336 << Name << SS.getRange();
4339 // C++ constructors and destructors with incorrect scopes can break
4340 // our AST invariants by having the wrong underlying types. If
4341 // that's the case, then drop this declaration entirely.
4342 if ((Name.getNameKind() == DeclarationName::CXXConstructorName ||
4343 Name.getNameKind() == DeclarationName::CXXDestructorName) &&
4344 !Context.hasSameType(Name.getCXXNameType(),
4345 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur))))
4351 // C++11 [dcl.meaning]p1:
4352 // [...] "The nested-name-specifier of the qualified declarator-id shall
4353 // not begin with a decltype-specifer"
4354 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data());
4355 while (SpecLoc.getPrefix())
4356 SpecLoc = SpecLoc.getPrefix();
4357 if (dyn_cast_or_null<DecltypeType>(
4358 SpecLoc.getNestedNameSpecifier()->getAsType()))
4359 Diag(Loc, diag::err_decltype_in_declarator)
4360 << SpecLoc.getTypeLoc().getSourceRange();
4365 NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D,
4366 MultiTemplateParamsArg TemplateParamLists) {
4367 // TODO: consider using NameInfo for diagnostic.
4368 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
4369 DeclarationName Name = NameInfo.getName();
4371 // All of these full declarators require an identifier. If it doesn't have
4372 // one, the ParsedFreeStandingDeclSpec action should be used.
4374 if (!D.isInvalidType()) // Reject this if we think it is valid.
4375 Diag(D.getDeclSpec().getLocStart(),
4376 diag::err_declarator_need_ident)
4377 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
4379 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
4382 // The scope passed in may not be a decl scope. Zip up the scope tree until
4383 // we find one that is.
4384 while ((S->getFlags() & Scope::DeclScope) == 0 ||
4385 (S->getFlags() & Scope::TemplateParamScope) != 0)
4388 DeclContext *DC = CurContext;
4389 if (D.getCXXScopeSpec().isInvalid())
4391 else if (D.getCXXScopeSpec().isSet()) {
4392 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
4393 UPPC_DeclarationQualifier))
4396 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
4397 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
4398 if (!DC || isa<EnumDecl>(DC)) {
4399 // If we could not compute the declaration context, it's because the
4400 // declaration context is dependent but does not refer to a class,
4401 // class template, or class template partial specialization. Complain
4402 // and return early, to avoid the coming semantic disaster.
4403 Diag(D.getIdentifierLoc(),
4404 diag::err_template_qualified_declarator_no_match)
4405 << D.getCXXScopeSpec().getScopeRep()
4406 << D.getCXXScopeSpec().getRange();
4409 bool IsDependentContext = DC->isDependentContext();
4411 if (!IsDependentContext &&
4412 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
4415 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
4416 Diag(D.getIdentifierLoc(),
4417 diag::err_member_def_undefined_record)
4418 << Name << DC << D.getCXXScopeSpec().getRange();
4420 } else if (!D.getDeclSpec().isFriendSpecified()) {
4421 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC,
4422 Name, D.getIdentifierLoc())) {
4430 // Check whether we need to rebuild the type of the given
4431 // declaration in the current instantiation.
4432 if (EnteringContext && IsDependentContext &&
4433 TemplateParamLists.size() != 0) {
4434 ContextRAII SavedContext(*this, DC);
4435 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
4440 if (DiagnoseClassNameShadow(DC, NameInfo))
4441 // If this is a typedef, we'll end up spewing multiple diagnostics.
4442 // Just return early; it's safer.
4443 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
4446 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
4447 QualType R = TInfo->getType();
4449 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
4450 UPPC_DeclarationType))
4453 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
4456 // See if this is a redefinition of a variable in the same scope.
4457 if (!D.getCXXScopeSpec().isSet()) {
4458 bool IsLinkageLookup = false;
4459 bool CreateBuiltins = false;
4461 // If the declaration we're planning to build will be a function
4462 // or object with linkage, then look for another declaration with
4463 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
4465 // If the declaration we're planning to build will be declared with
4466 // external linkage in the translation unit, create any builtin with
4468 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
4470 else if (CurContext->isFunctionOrMethod() &&
4471 (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern ||
4472 R->isFunctionType())) {
4473 IsLinkageLookup = true;
4475 CurContext->getEnclosingNamespaceContext()->isTranslationUnit();
4476 } else if (CurContext->getRedeclContext()->isTranslationUnit() &&
4477 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
4478 CreateBuiltins = true;
4480 if (IsLinkageLookup)
4481 Previous.clear(LookupRedeclarationWithLinkage);
4483 LookupName(Previous, S, CreateBuiltins);
4484 } else { // Something like "int foo::x;"
4485 LookupQualifiedName(Previous, DC);
4487 // C++ [dcl.meaning]p1:
4488 // When the declarator-id is qualified, the declaration shall refer to a
4489 // previously declared member of the class or namespace to which the
4490 // qualifier refers (or, in the case of a namespace, of an element of the
4491 // inline namespace set of that namespace (7.3.1)) or to a specialization
4494 // Note that we already checked the context above, and that we do not have
4495 // enough information to make sure that Previous contains the declaration
4496 // we want to match. For example, given:
4503 // void X::f(int) { } // ill-formed
4505 // In this case, Previous will point to the overload set
4506 // containing the two f's declared in X, but neither of them
4509 // C++ [dcl.meaning]p1:
4510 // [...] the member shall not merely have been introduced by a
4511 // using-declaration in the scope of the class or namespace nominated by
4512 // the nested-name-specifier of the declarator-id.
4513 RemoveUsingDecls(Previous);
4516 if (Previous.isSingleResult() &&
4517 Previous.getFoundDecl()->isTemplateParameter()) {
4518 // Maybe we will complain about the shadowed template parameter.
4519 if (!D.isInvalidType())
4520 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
4521 Previous.getFoundDecl());
4523 // Just pretend that we didn't see the previous declaration.
4527 // In C++, the previous declaration we find might be a tag type
4528 // (class or enum). In this case, the new declaration will hide the
4529 // tag type. Note that this does does not apply if we're declaring a
4530 // typedef (C++ [dcl.typedef]p4).
4531 if (Previous.isSingleTagDecl() &&
4532 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
4535 // Check that there are no default arguments other than in the parameters
4536 // of a function declaration (C++ only).
4537 if (getLangOpts().CPlusPlus)
4538 CheckExtraCXXDefaultArguments(D);
4542 bool AddToScope = true;
4543 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
4544 if (TemplateParamLists.size()) {
4545 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
4549 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
4550 } else if (R->isFunctionType()) {
4551 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
4555 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, TemplateParamLists,
4562 // If this has an identifier and is not an invalid redeclaration or
4563 // function template specialization, add it to the scope stack.
4564 if (New->getDeclName() && AddToScope &&
4565 !(D.isRedeclaration() && New->isInvalidDecl())) {
4566 // Only make a locally-scoped extern declaration visible if it is the first
4567 // declaration of this entity. Qualified lookup for such an entity should
4568 // only find this declaration if there is no visible declaration of it.
4569 bool AddToContext = !D.isRedeclaration() || !New->isLocalExternDecl();
4570 PushOnScopeChains(New, S, AddToContext);
4572 CurContext->addHiddenDecl(New);
4578 /// Helper method to turn variable array types into constant array
4579 /// types in certain situations which would otherwise be errors (for
4580 /// GCC compatibility).
4581 static QualType TryToFixInvalidVariablyModifiedType(QualType T,
4582 ASTContext &Context,
4583 bool &SizeIsNegative,
4584 llvm::APSInt &Oversized) {
4585 // This method tries to turn a variable array into a constant
4586 // array even when the size isn't an ICE. This is necessary
4587 // for compatibility with code that depends on gcc's buggy
4588 // constant expression folding, like struct {char x[(int)(char*)2];}
4589 SizeIsNegative = false;
4592 if (T->isDependentType())
4595 QualifierCollector Qs;
4596 const Type *Ty = Qs.strip(T);
4598 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
4599 QualType Pointee = PTy->getPointeeType();
4600 QualType FixedType =
4601 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
4603 if (FixedType.isNull()) return FixedType;
4604 FixedType = Context.getPointerType(FixedType);
4605 return Qs.apply(Context, FixedType);
4607 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
4608 QualType Inner = PTy->getInnerType();
4609 QualType FixedType =
4610 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
4612 if (FixedType.isNull()) return FixedType;
4613 FixedType = Context.getParenType(FixedType);
4614 return Qs.apply(Context, FixedType);
4617 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
4620 // FIXME: We should probably handle this case
4621 if (VLATy->getElementType()->isVariablyModifiedType())
4625 if (!VLATy->getSizeExpr() ||
4626 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context))
4629 // Check whether the array size is negative.
4630 if (Res.isSigned() && Res.isNegative()) {
4631 SizeIsNegative = true;
4635 // Check whether the array is too large to be addressed.
4636 unsigned ActiveSizeBits
4637 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
4639 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
4644 return Context.getConstantArrayType(VLATy->getElementType(),
4645 Res, ArrayType::Normal, 0);
4649 FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) {
4650 if (PointerTypeLoc SrcPTL = SrcTL.getAs<PointerTypeLoc>()) {
4651 PointerTypeLoc DstPTL = DstTL.castAs<PointerTypeLoc>();
4652 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getPointeeLoc(),
4653 DstPTL.getPointeeLoc());
4654 DstPTL.setStarLoc(SrcPTL.getStarLoc());
4657 if (ParenTypeLoc SrcPTL = SrcTL.getAs<ParenTypeLoc>()) {
4658 ParenTypeLoc DstPTL = DstTL.castAs<ParenTypeLoc>();
4659 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getInnerLoc(),
4660 DstPTL.getInnerLoc());
4661 DstPTL.setLParenLoc(SrcPTL.getLParenLoc());
4662 DstPTL.setRParenLoc(SrcPTL.getRParenLoc());
4665 ArrayTypeLoc SrcATL = SrcTL.castAs<ArrayTypeLoc>();
4666 ArrayTypeLoc DstATL = DstTL.castAs<ArrayTypeLoc>();
4667 TypeLoc SrcElemTL = SrcATL.getElementLoc();
4668 TypeLoc DstElemTL = DstATL.getElementLoc();
4669 DstElemTL.initializeFullCopy(SrcElemTL);
4670 DstATL.setLBracketLoc(SrcATL.getLBracketLoc());
4671 DstATL.setSizeExpr(SrcATL.getSizeExpr());
4672 DstATL.setRBracketLoc(SrcATL.getRBracketLoc());
4675 /// Helper method to turn variable array types into constant array
4676 /// types in certain situations which would otherwise be errors (for
4677 /// GCC compatibility).
4678 static TypeSourceInfo*
4679 TryToFixInvalidVariablyModifiedTypeSourceInfo(TypeSourceInfo *TInfo,
4680 ASTContext &Context,
4681 bool &SizeIsNegative,
4682 llvm::APSInt &Oversized) {
4684 = TryToFixInvalidVariablyModifiedType(TInfo->getType(), Context,
4685 SizeIsNegative, Oversized);
4686 if (FixedTy.isNull())
4688 TypeSourceInfo *FixedTInfo = Context.getTrivialTypeSourceInfo(FixedTy);
4689 FixInvalidVariablyModifiedTypeLoc(TInfo->getTypeLoc(),
4690 FixedTInfo->getTypeLoc());
4694 /// \brief Register the given locally-scoped extern "C" declaration so
4695 /// that it can be found later for redeclarations. We include any extern "C"
4696 /// declaration that is not visible in the translation unit here, not just
4697 /// function-scope declarations.
4699 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S) {
4700 if (!getLangOpts().CPlusPlus &&
4701 ND->getLexicalDeclContext()->getRedeclContext()->isTranslationUnit())
4702 // Don't need to track declarations in the TU in C.
4705 // Note that we have a locally-scoped external with this name.
4706 // FIXME: There can be multiple such declarations if they are functions marked
4707 // __attribute__((overloadable)) declared in function scope in C.
4708 LocallyScopedExternCDecls[ND->getDeclName()] = ND;
4711 NamedDecl *Sema::findLocallyScopedExternCDecl(DeclarationName Name) {
4712 if (ExternalSource) {
4713 // Load locally-scoped external decls from the external source.
4714 // FIXME: This is inefficient. Maybe add a DeclContext for extern "C" decls?
4715 SmallVector<NamedDecl *, 4> Decls;
4716 ExternalSource->ReadLocallyScopedExternCDecls(Decls);
4717 for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
4718 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
4719 = LocallyScopedExternCDecls.find(Decls[I]->getDeclName());
4720 if (Pos == LocallyScopedExternCDecls.end())
4721 LocallyScopedExternCDecls[Decls[I]->getDeclName()] = Decls[I];
4725 NamedDecl *D = LocallyScopedExternCDecls.lookup(Name);
4726 return D ? D->getMostRecentDecl() : nullptr;
4729 /// \brief Diagnose function specifiers on a declaration of an identifier that
4730 /// does not identify a function.
4731 void Sema::DiagnoseFunctionSpecifiers(const DeclSpec &DS) {
4732 // FIXME: We should probably indicate the identifier in question to avoid
4733 // confusion for constructs like "inline int a(), b;"
4734 if (DS.isInlineSpecified())
4735 Diag(DS.getInlineSpecLoc(),
4736 diag::err_inline_non_function);
4738 if (DS.isVirtualSpecified())
4739 Diag(DS.getVirtualSpecLoc(),
4740 diag::err_virtual_non_function);
4742 if (DS.isExplicitSpecified())
4743 Diag(DS.getExplicitSpecLoc(),
4744 diag::err_explicit_non_function);
4746 if (DS.isNoreturnSpecified())
4747 Diag(DS.getNoreturnSpecLoc(),
4748 diag::err_noreturn_non_function);
4752 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
4753 TypeSourceInfo *TInfo, LookupResult &Previous) {
4754 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
4755 if (D.getCXXScopeSpec().isSet()) {
4756 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
4757 << D.getCXXScopeSpec().getRange();
4759 // Pretend we didn't see the scope specifier.
4764 DiagnoseFunctionSpecifiers(D.getDeclSpec());
4766 if (D.getDeclSpec().isConstexprSpecified())
4767 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
4770 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
4771 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
4772 << D.getName().getSourceRange();
4776 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
4777 if (!NewTD) return nullptr;
4779 // Handle attributes prior to checking for duplicates in MergeVarDecl
4780 ProcessDeclAttributes(S, NewTD, D);
4782 CheckTypedefForVariablyModifiedType(S, NewTD);
4784 bool Redeclaration = D.isRedeclaration();
4785 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
4786 D.setRedeclaration(Redeclaration);
4791 Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
4792 // C99 6.7.7p2: If a typedef name specifies a variably modified type
4793 // then it shall have block scope.
4794 // Note that variably modified types must be fixed before merging the decl so
4795 // that redeclarations will match.
4796 TypeSourceInfo *TInfo = NewTD->getTypeSourceInfo();
4797 QualType T = TInfo->getType();
4798 if (T->isVariablyModifiedType()) {
4799 getCurFunction()->setHasBranchProtectedScope();
4801 if (S->getFnParent() == nullptr) {
4802 bool SizeIsNegative;
4803 llvm::APSInt Oversized;
4804 TypeSourceInfo *FixedTInfo =
4805 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
4809 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
4810 NewTD->setTypeSourceInfo(FixedTInfo);
4813 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
4814 else if (T->isVariableArrayType())
4815 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
4816 else if (Oversized.getBoolValue())
4817 Diag(NewTD->getLocation(), diag::err_array_too_large)
4818 << Oversized.toString(10);
4820 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
4821 NewTD->setInvalidDecl();
4828 /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
4829 /// declares a typedef-name, either using the 'typedef' type specifier or via
4830 /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
4832 Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
4833 LookupResult &Previous, bool &Redeclaration) {
4834 // Merge the decl with the existing one if appropriate. If the decl is
4835 // in an outer scope, it isn't the same thing.
4836 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/false,
4837 /*AllowInlineNamespace*/false);
4838 filterNonConflictingPreviousDecls(Context, NewTD, Previous);
4839 if (!Previous.empty()) {
4840 Redeclaration = true;
4841 MergeTypedefNameDecl(NewTD, Previous);
4844 // If this is the C FILE type, notify the AST context.
4845 if (IdentifierInfo *II = NewTD->getIdentifier())
4846 if (!NewTD->isInvalidDecl() &&
4847 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
4848 if (II->isStr("FILE"))
4849 Context.setFILEDecl(NewTD);
4850 else if (II->isStr("jmp_buf"))
4851 Context.setjmp_bufDecl(NewTD);
4852 else if (II->isStr("sigjmp_buf"))
4853 Context.setsigjmp_bufDecl(NewTD);
4854 else if (II->isStr("ucontext_t"))
4855 Context.setucontext_tDecl(NewTD);
4861 /// \brief Determines whether the given declaration is an out-of-scope
4862 /// previous declaration.
4864 /// This routine should be invoked when name lookup has found a
4865 /// previous declaration (PrevDecl) that is not in the scope where a
4866 /// new declaration by the same name is being introduced. If the new
4867 /// declaration occurs in a local scope, previous declarations with
4868 /// linkage may still be considered previous declarations (C99
4869 /// 6.2.2p4-5, C++ [basic.link]p6).
4871 /// \param PrevDecl the previous declaration found by name
4874 /// \param DC the context in which the new declaration is being
4877 /// \returns true if PrevDecl is an out-of-scope previous declaration
4878 /// for a new delcaration with the same name.
4880 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
4881 ASTContext &Context) {
4885 if (!PrevDecl->hasLinkage())
4888 if (Context.getLangOpts().CPlusPlus) {
4889 // C++ [basic.link]p6:
4890 // If there is a visible declaration of an entity with linkage
4891 // having the same name and type, ignoring entities declared
4892 // outside the innermost enclosing namespace scope, the block
4893 // scope declaration declares that same entity and receives the
4894 // linkage of the previous declaration.
4895 DeclContext *OuterContext = DC->getRedeclContext();
4896 if (!OuterContext->isFunctionOrMethod())
4897 // This rule only applies to block-scope declarations.
4900 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
4901 if (PrevOuterContext->isRecord())
4902 // We found a member function: ignore it.
4905 // Find the innermost enclosing namespace for the new and
4906 // previous declarations.
4907 OuterContext = OuterContext->getEnclosingNamespaceContext();
4908 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
4910 // The previous declaration is in a different namespace, so it
4911 // isn't the same function.
4912 if (!OuterContext->Equals(PrevOuterContext))
4919 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
4920 CXXScopeSpec &SS = D.getCXXScopeSpec();
4921 if (!SS.isSet()) return;
4922 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
4925 bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
4926 QualType type = decl->getType();
4927 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
4928 if (lifetime == Qualifiers::OCL_Autoreleasing) {
4929 // Various kinds of declaration aren't allowed to be __autoreleasing.
4930 unsigned kind = -1U;
4931 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
4932 if (var->hasAttr<BlocksAttr>())
4933 kind = 0; // __block
4934 else if (!var->hasLocalStorage())
4936 } else if (isa<ObjCIvarDecl>(decl)) {
4938 } else if (isa<FieldDecl>(decl)) {
4943 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
4946 } else if (lifetime == Qualifiers::OCL_None) {
4947 // Try to infer lifetime.
4948 if (!type->isObjCLifetimeType())
4951 lifetime = type->getObjCARCImplicitLifetime();
4952 type = Context.getLifetimeQualifiedType(type, lifetime);
4953 decl->setType(type);
4956 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
4957 // Thread-local variables cannot have lifetime.
4958 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
4959 var->getTLSKind()) {
4960 Diag(var->getLocation(), diag::err_arc_thread_ownership)
4969 static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) {
4970 // Ensure that an auto decl is deduced otherwise the checks below might cache
4971 // the wrong linkage.
4972 assert(S.ParsingInitForAutoVars.count(&ND) == 0);
4974 // 'weak' only applies to declarations with external linkage.
4975 if (WeakAttr *Attr = ND.getAttr<WeakAttr>()) {
4976 if (!ND.isExternallyVisible()) {
4977 S.Diag(Attr->getLocation(), diag::err_attribute_weak_static);
4978 ND.dropAttr<WeakAttr>();
4981 if (WeakRefAttr *Attr = ND.getAttr<WeakRefAttr>()) {
4982 if (ND.isExternallyVisible()) {
4983 S.Diag(Attr->getLocation(), diag::err_attribute_weakref_not_static);
4984 ND.dropAttr<WeakRefAttr>();
4988 // 'selectany' only applies to externally visible varable declarations.
4989 // It does not apply to functions.
4990 if (SelectAnyAttr *Attr = ND.getAttr<SelectAnyAttr>()) {
4991 if (isa<FunctionDecl>(ND) || !ND.isExternallyVisible()) {
4992 S.Diag(Attr->getLocation(), diag::err_attribute_selectany_non_extern_data);
4993 ND.dropAttr<SelectAnyAttr>();
4997 // dll attributes require external linkage.
4998 if (const DLLImportAttr *Attr = ND.getAttr<DLLImportAttr>()) {
4999 if (!ND.isExternallyVisible()) {
5000 S.Diag(ND.getLocation(), diag::err_attribute_dll_not_extern)
5002 ND.setInvalidDecl();
5005 if (const DLLExportAttr *Attr = ND.getAttr<DLLExportAttr>()) {
5006 if (!ND.isExternallyVisible()) {
5007 S.Diag(ND.getLocation(), diag::err_attribute_dll_not_extern)
5009 ND.setInvalidDecl();
5014 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,
5016 bool IsSpecialization) {
5017 if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl))
5018 OldDecl = OldTD->getTemplatedDecl();
5019 if (TemplateDecl *NewTD = dyn_cast<TemplateDecl>(NewDecl))
5020 NewDecl = NewTD->getTemplatedDecl();
5022 if (!OldDecl || !NewDecl)
5025 const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>();
5026 const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>();
5027 const DLLImportAttr *NewImportAttr = NewDecl->getAttr<DLLImportAttr>();
5028 const DLLExportAttr *NewExportAttr = NewDecl->getAttr<DLLExportAttr>();
5030 // dllimport and dllexport are inheritable attributes so we have to exclude
5031 // inherited attribute instances.
5032 bool HasNewAttr = (NewImportAttr && !NewImportAttr->isInherited()) ||
5033 (NewExportAttr && !NewExportAttr->isInherited());
5035 // A redeclaration is not allowed to add a dllimport or dllexport attribute,
5036 // the only exception being explicit specializations.
5037 // Implicitly generated declarations are also excluded for now because there
5038 // is no other way to switch these to use dllimport or dllexport.
5039 bool AddsAttr = !(OldImportAttr || OldExportAttr) && HasNewAttr;
5040 if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) {
5041 S.Diag(NewDecl->getLocation(), diag::err_attribute_dll_redeclaration)
5043 << (NewImportAttr ? (const Attr *)NewImportAttr : NewExportAttr);
5044 S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
5045 NewDecl->setInvalidDecl();
5049 // A redeclaration is not allowed to drop a dllimport attribute, the only
5050 // exception being inline function definitions.
5051 // NB: MSVC converts such a declaration to dllexport.
5052 bool IsInline = false, IsStaticDataMember = false;
5053 if (const auto *VD = dyn_cast<VarDecl>(NewDecl))
5054 // Ignore static data because out-of-line definitions are diagnosed
5056 IsStaticDataMember = VD->isStaticDataMember();
5057 else if (const auto *FD = dyn_cast<FunctionDecl>(NewDecl))
5058 IsInline = FD->isInlined();
5060 if (OldImportAttr && !HasNewAttr && !IsInline && !IsStaticDataMember) {
5061 S.Diag(NewDecl->getLocation(),
5062 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
5063 << NewDecl << OldImportAttr;
5064 S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
5065 S.Diag(OldImportAttr->getLocation(), diag::note_previous_attribute);
5066 OldDecl->dropAttr<DLLImportAttr>();
5067 NewDecl->dropAttr<DLLImportAttr>();
5071 /// Given that we are within the definition of the given function,
5072 /// will that definition behave like C99's 'inline', where the
5073 /// definition is discarded except for optimization purposes?
5074 static bool isFunctionDefinitionDiscarded(Sema &S, FunctionDecl *FD) {
5075 // Try to avoid calling GetGVALinkageForFunction.
5077 // All cases of this require the 'inline' keyword.
5078 if (!FD->isInlined()) return false;
5080 // This is only possible in C++ with the gnu_inline attribute.
5081 if (S.getLangOpts().CPlusPlus && !FD->hasAttr<GNUInlineAttr>())
5084 // Okay, go ahead and call the relatively-more-expensive function.
5087 // AST quite reasonably asserts that it's working on a function
5088 // definition. We don't really have a way to tell it that we're
5089 // currently defining the function, so just lie to it in +Asserts
5090 // builds. This is an awful hack.
5095 S.Context.GetGVALinkageForFunction(FD) == GVA_AvailableExternally;
5104 /// Determine whether a variable is extern "C" prior to attaching
5105 /// an initializer. We can't just call isExternC() here, because that
5106 /// will also compute and cache whether the declaration is externally
5107 /// visible, which might change when we attach the initializer.
5109 /// This can only be used if the declaration is known to not be a
5110 /// redeclaration of an internal linkage declaration.
5116 /// Attaching the initializer here makes this declaration not externally
5117 /// visible, because its type has internal linkage.
5119 /// FIXME: This is a hack.
5120 template<typename T>
5121 static bool isIncompleteDeclExternC(Sema &S, const T *D) {
5122 if (S.getLangOpts().CPlusPlus) {
5123 // In C++, the overloadable attribute negates the effects of extern "C".
5124 if (!D->isInExternCContext() || D->template hasAttr<OverloadableAttr>())
5127 return D->isExternC();
5130 static bool shouldConsiderLinkage(const VarDecl *VD) {
5131 const DeclContext *DC = VD->getDeclContext()->getRedeclContext();
5132 if (DC->isFunctionOrMethod())
5133 return VD->hasExternalStorage();
5134 if (DC->isFileContext())
5138 llvm_unreachable("Unexpected context");
5141 static bool shouldConsiderLinkage(const FunctionDecl *FD) {
5142 const DeclContext *DC = FD->getDeclContext()->getRedeclContext();
5143 if (DC->isFileContext() || DC->isFunctionOrMethod())
5147 llvm_unreachable("Unexpected context");
5150 static bool hasParsedAttr(Scope *S, const AttributeList *AttrList,
5151 AttributeList::Kind Kind) {
5152 for (const AttributeList *L = AttrList; L; L = L->getNext())
5153 if (L->getKind() == Kind)
5158 static bool hasParsedAttr(Scope *S, const Declarator &PD,
5159 AttributeList::Kind Kind) {
5160 // Check decl attributes on the DeclSpec.
5161 if (hasParsedAttr(S, PD.getDeclSpec().getAttributes().getList(), Kind))
5164 // Walk the declarator structure, checking decl attributes that were in a type
5165 // position to the decl itself.
5166 for (unsigned I = 0, E = PD.getNumTypeObjects(); I != E; ++I) {
5167 if (hasParsedAttr(S, PD.getTypeObject(I).getAttrs(), Kind))
5171 // Finally, check attributes on the decl itself.
5172 return hasParsedAttr(S, PD.getAttributes(), Kind);
5175 /// Adjust the \c DeclContext for a function or variable that might be a
5176 /// function-local external declaration.
5177 bool Sema::adjustContextForLocalExternDecl(DeclContext *&DC) {
5178 if (!DC->isFunctionOrMethod())
5181 // If this is a local extern function or variable declared within a function
5182 // template, don't add it into the enclosing namespace scope until it is
5183 // instantiated; it might have a dependent type right now.
5184 if (DC->isDependentContext())
5187 // C++11 [basic.link]p7:
5188 // When a block scope declaration of an entity with linkage is not found to
5189 // refer to some other declaration, then that entity is a member of the
5190 // innermost enclosing namespace.
5192 // Per C++11 [namespace.def]p6, the innermost enclosing namespace is a
5193 // semantically-enclosing namespace, not a lexically-enclosing one.
5194 while (!DC->isFileContext() && !isa<LinkageSpecDecl>(DC))
5195 DC = DC->getParent();
5200 Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
5201 TypeSourceInfo *TInfo, LookupResult &Previous,
5202 MultiTemplateParamsArg TemplateParamLists,
5204 QualType R = TInfo->getType();
5205 DeclarationName Name = GetNameForDeclarator(D).getName();
5207 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
5208 VarDecl::StorageClass SC =
5209 StorageClassSpecToVarDeclStorageClass(D.getDeclSpec());
5211 // dllimport globals without explicit storage class are treated as extern. We
5212 // have to change the storage class this early to get the right DeclContext.
5213 if (SC == SC_None && !DC->isRecord() &&
5214 hasParsedAttr(S, D, AttributeList::AT_DLLImport) &&
5215 !hasParsedAttr(S, D, AttributeList::AT_DLLExport))
5218 DeclContext *OriginalDC = DC;
5219 bool IsLocalExternDecl = SC == SC_Extern &&
5220 adjustContextForLocalExternDecl(DC);
5222 if (getLangOpts().OpenCL) {
5223 // OpenCL v1.0 s6.8.a.3: Pointers to functions are not allowed.
5225 while (NR->isPointerType()) {
5226 if (NR->isFunctionPointerType()) {
5227 Diag(D.getIdentifierLoc(), diag::err_opencl_function_pointer_variable);
5231 NR = NR->getPointeeType();
5234 if (!getOpenCLOptions().cl_khr_fp16) {
5235 // OpenCL v1.2 s6.1.1.1: reject declaring variables of the half and
5236 // half array type (unless the cl_khr_fp16 extension is enabled).
5237 if (Context.getBaseElementType(R)->isHalfType()) {
5238 Diag(D.getIdentifierLoc(), diag::err_opencl_half_declaration) << R;
5244 if (SCSpec == DeclSpec::SCS_mutable) {
5245 // mutable can only appear on non-static class members, so it's always
5247 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
5252 if (getLangOpts().CPlusPlus11 && SCSpec == DeclSpec::SCS_register &&
5253 !D.getAsmLabel() && !getSourceManager().isInSystemMacro(
5254 D.getDeclSpec().getStorageClassSpecLoc())) {
5255 // In C++11, the 'register' storage class specifier is deprecated.
5256 // Suppress the warning in system macros, it's used in macros in some
5257 // popular C system headers, such as in glibc's htonl() macro.
5258 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5259 diag::warn_deprecated_register)
5260 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5263 IdentifierInfo *II = Name.getAsIdentifierInfo();
5265 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
5270 DiagnoseFunctionSpecifiers(D.getDeclSpec());
5272 if (!DC->isRecord() && S->getFnParent() == nullptr) {
5273 // C99 6.9p2: The storage-class specifiers auto and register shall not
5274 // appear in the declaration specifiers in an external declaration.
5275 // Global Register+Asm is a GNU extension we support.
5276 if (SC == SC_Auto || (SC == SC_Register && !D.getAsmLabel())) {
5277 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
5282 if (getLangOpts().OpenCL) {
5283 // Set up the special work-group-local storage class for variables in the
5284 // OpenCL __local address space.
5285 if (R.getAddressSpace() == LangAS::opencl_local) {
5286 SC = SC_OpenCLWorkGroupLocal;
5289 // OpenCL v1.2 s6.9.b p4:
5290 // The sampler type cannot be used with the __local and __global address
5291 // space qualifiers.
5292 if (R->isSamplerT() && (R.getAddressSpace() == LangAS::opencl_local ||
5293 R.getAddressSpace() == LangAS::opencl_global)) {
5294 Diag(D.getIdentifierLoc(), diag::err_wrong_sampler_addressspace);
5297 // OpenCL 1.2 spec, p6.9 r:
5298 // The event type cannot be used to declare a program scope variable.
5299 // The event type cannot be used with the __local, __constant and __global
5300 // address space qualifiers.
5301 if (R->isEventT()) {
5302 if (S->getParent() == nullptr) {
5303 Diag(D.getLocStart(), diag::err_event_t_global_var);
5307 if (R.getAddressSpace()) {
5308 Diag(D.getLocStart(), diag::err_event_t_addr_space_qual);
5314 bool IsExplicitSpecialization = false;
5315 bool IsVariableTemplateSpecialization = false;
5316 bool IsPartialSpecialization = false;
5317 bool IsVariableTemplate = false;
5318 VarDecl *NewVD = nullptr;
5319 VarTemplateDecl *NewTemplate = nullptr;
5320 TemplateParameterList *TemplateParams = nullptr;
5321 if (!getLangOpts().CPlusPlus) {
5322 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
5323 D.getIdentifierLoc(), II,
5326 if (D.isInvalidType())
5327 NewVD->setInvalidDecl();
5329 bool Invalid = false;
5331 if (DC->isRecord() && !CurContext->isRecord()) {
5332 // This is an out-of-line definition of a static data member.
5337 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5338 diag::err_static_out_of_line)
5339 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5344 // [dcl.stc] p2: The auto or register specifiers shall be applied only
5345 // to names of variables declared in a block or to function parameters.
5346 // [dcl.stc] p6: The extern specifier cannot be used in the declaration
5349 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5350 diag::err_storage_class_for_static_member)
5351 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
5353 case SC_PrivateExtern:
5354 llvm_unreachable("C storage class in c++!");
5355 case SC_OpenCLWorkGroupLocal:
5356 llvm_unreachable("OpenCL storage class in c++!");
5360 if (SC == SC_Static && CurContext->isRecord()) {
5361 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
5362 if (RD->isLocalClass())
5363 Diag(D.getIdentifierLoc(),
5364 diag::err_static_data_member_not_allowed_in_local_class)
5365 << Name << RD->getDeclName();
5367 // C++98 [class.union]p1: If a union contains a static data member,
5368 // the program is ill-formed. C++11 drops this restriction.
5370 Diag(D.getIdentifierLoc(),
5371 getLangOpts().CPlusPlus11
5372 ? diag::warn_cxx98_compat_static_data_member_in_union
5373 : diag::ext_static_data_member_in_union) << Name;
5374 // We conservatively disallow static data members in anonymous structs.
5375 else if (!RD->getDeclName())
5376 Diag(D.getIdentifierLoc(),
5377 diag::err_static_data_member_not_allowed_in_anon_struct)
5378 << Name << RD->isUnion();
5382 // Match up the template parameter lists with the scope specifier, then
5383 // determine whether we have a template or a template specialization.
5384 TemplateParams = MatchTemplateParametersToScopeSpecifier(
5385 D.getDeclSpec().getLocStart(), D.getIdentifierLoc(),
5386 D.getCXXScopeSpec(),
5387 D.getName().getKind() == UnqualifiedId::IK_TemplateId
5388 ? D.getName().TemplateId
5391 /*never a friend*/ false, IsExplicitSpecialization, Invalid);
5393 if (TemplateParams) {
5394 if (!TemplateParams->size() &&
5395 D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
5396 // There is an extraneous 'template<>' for this variable. Complain
5397 // about it, but allow the declaration of the variable.
5398 Diag(TemplateParams->getTemplateLoc(),
5399 diag::err_template_variable_noparams)
5401 << SourceRange(TemplateParams->getTemplateLoc(),
5402 TemplateParams->getRAngleLoc());
5403 TemplateParams = nullptr;
5405 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
5406 // This is an explicit specialization or a partial specialization.
5407 // FIXME: Check that we can declare a specialization here.
5408 IsVariableTemplateSpecialization = true;
5409 IsPartialSpecialization = TemplateParams->size() > 0;
5410 } else { // if (TemplateParams->size() > 0)
5411 // This is a template declaration.
5412 IsVariableTemplate = true;
5414 // Check that we can declare a template here.
5415 if (CheckTemplateDeclScope(S, TemplateParams))
5418 // Only C++1y supports variable templates (N3651).
5419 Diag(D.getIdentifierLoc(),
5420 getLangOpts().CPlusPlus1y
5421 ? diag::warn_cxx11_compat_variable_template
5422 : diag::ext_variable_template);
5426 assert(D.getName().getKind() != UnqualifiedId::IK_TemplateId &&
5427 "should have a 'template<>' for this decl");
5430 if (IsVariableTemplateSpecialization) {
5431 SourceLocation TemplateKWLoc =
5432 TemplateParamLists.size() > 0
5433 ? TemplateParamLists[0]->getTemplateLoc()
5435 DeclResult Res = ActOnVarTemplateSpecialization(
5436 S, D, TInfo, TemplateKWLoc, TemplateParams, SC,
5437 IsPartialSpecialization);
5438 if (Res.isInvalid())
5440 NewVD = cast<VarDecl>(Res.get());
5443 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
5444 D.getIdentifierLoc(), II, R, TInfo, SC);
5446 // If this is supposed to be a variable template, create it as such.
5447 if (IsVariableTemplate) {
5449 VarTemplateDecl::Create(Context, DC, D.getIdentifierLoc(), Name,
5450 TemplateParams, NewVD);
5451 NewVD->setDescribedVarTemplate(NewTemplate);
5454 // If this decl has an auto type in need of deduction, make a note of the
5455 // Decl so we can diagnose uses of it in its own initializer.
5456 if (D.getDeclSpec().containsPlaceholderType() && R->getContainedAutoType())
5457 ParsingInitForAutoVars.insert(NewVD);
5459 if (D.isInvalidType() || Invalid) {
5460 NewVD->setInvalidDecl();
5462 NewTemplate->setInvalidDecl();
5465 SetNestedNameSpecifier(NewVD, D);
5467 // If we have any template parameter lists that don't directly belong to
5468 // the variable (matching the scope specifier), store them.
5469 unsigned VDTemplateParamLists = TemplateParams ? 1 : 0;
5470 if (TemplateParamLists.size() > VDTemplateParamLists)
5471 NewVD->setTemplateParameterListsInfo(
5472 Context, TemplateParamLists.size() - VDTemplateParamLists,
5473 TemplateParamLists.data());
5475 if (D.getDeclSpec().isConstexprSpecified())
5476 NewVD->setConstexpr(true);
5479 // Set the lexical context. If the declarator has a C++ scope specifier, the
5480 // lexical context will be different from the semantic context.
5481 NewVD->setLexicalDeclContext(CurContext);
5483 NewTemplate->setLexicalDeclContext(CurContext);
5485 if (IsLocalExternDecl)
5486 NewVD->setLocalExternDecl();
5488 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) {
5489 if (NewVD->hasLocalStorage()) {
5490 // C++11 [dcl.stc]p4:
5491 // When thread_local is applied to a variable of block scope the
5492 // storage-class-specifier static is implied if it does not appear
5494 // Core issue: 'static' is not implied if the variable is declared
5496 if (SCSpec == DeclSpec::SCS_unspecified &&
5497 TSCS == DeclSpec::TSCS_thread_local &&
5498 DC->isFunctionOrMethod())
5499 NewVD->setTSCSpec(TSCS);
5501 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
5502 diag::err_thread_non_global)
5503 << DeclSpec::getSpecifierName(TSCS);
5504 } else if (!Context.getTargetInfo().isTLSSupported())
5505 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
5506 diag::err_thread_unsupported);
5508 NewVD->setTSCSpec(TSCS);
5512 // An inline definition of a function with external linkage shall
5513 // not contain a definition of a modifiable object with static or
5514 // thread storage duration...
5515 // We only apply this when the function is required to be defined
5516 // elsewhere, i.e. when the function is not 'extern inline'. Note
5517 // that a local variable with thread storage duration still has to
5518 // be marked 'static'. Also note that it's possible to get these
5519 // semantics in C++ using __attribute__((gnu_inline)).
5520 if (SC == SC_Static && S->getFnParent() != nullptr &&
5521 !NewVD->getType().isConstQualified()) {
5522 FunctionDecl *CurFD = getCurFunctionDecl();
5523 if (CurFD && isFunctionDefinitionDiscarded(*this, CurFD)) {
5524 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5525 diag::warn_static_local_in_extern_inline);
5526 MaybeSuggestAddingStaticToDecl(CurFD);
5530 if (D.getDeclSpec().isModulePrivateSpecified()) {
5531 if (IsVariableTemplateSpecialization)
5532 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
5533 << (IsPartialSpecialization ? 1 : 0)
5534 << FixItHint::CreateRemoval(
5535 D.getDeclSpec().getModulePrivateSpecLoc());
5536 else if (IsExplicitSpecialization)
5537 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
5539 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
5540 else if (NewVD->hasLocalStorage())
5541 Diag(NewVD->getLocation(), diag::err_module_private_local)
5542 << 0 << NewVD->getDeclName()
5543 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
5544 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
5546 NewVD->setModulePrivate();
5548 NewTemplate->setModulePrivate();
5552 // Handle attributes prior to checking for duplicates in MergeVarDecl
5553 ProcessDeclAttributes(S, NewVD, D);
5555 if (getLangOpts().CUDA) {
5556 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static
5557 // storage [duration]."
5558 if (SC == SC_None && S->getFnParent() != nullptr &&
5559 (NewVD->hasAttr<CUDASharedAttr>() ||
5560 NewVD->hasAttr<CUDAConstantAttr>())) {
5561 NewVD->setStorageClass(SC_Static);
5565 // Ensure that dllimport globals without explicit storage class are treated as
5566 // extern. The storage class is set above using parsed attributes. Now we can
5567 // check the VarDecl itself.
5568 assert(!NewVD->hasAttr<DLLImportAttr>() ||
5569 NewVD->getAttr<DLLImportAttr>()->isInherited() ||
5570 NewVD->isStaticDataMember() || NewVD->getStorageClass() != SC_None);
5572 // In auto-retain/release, infer strong retension for variables of
5574 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
5575 NewVD->setInvalidDecl();
5577 // Handle GNU asm-label extension (encoded as an attribute).
5578 if (Expr *E = (Expr*)D.getAsmLabel()) {
5579 // The parser guarantees this is a string.
5580 StringLiteral *SE = cast<StringLiteral>(E);
5581 StringRef Label = SE->getString();
5582 if (S->getFnParent() != nullptr) {
5586 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
5589 // Local Named register
5590 if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
5591 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
5595 case SC_PrivateExtern:
5596 case SC_OpenCLWorkGroupLocal:
5599 } else if (SC == SC_Register) {
5600 // Global Named register
5601 if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
5602 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
5603 if (!R->isIntegralType(Context) && !R->isPointerType()) {
5604 Diag(D.getLocStart(), diag::err_asm_bad_register_type);
5605 NewVD->setInvalidDecl(true);
5609 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
5610 Context, Label, 0));
5611 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
5612 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
5613 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
5614 if (I != ExtnameUndeclaredIdentifiers.end()) {
5615 NewVD->addAttr(I->second);
5616 ExtnameUndeclaredIdentifiers.erase(I);
5620 // Diagnose shadowed variables before filtering for scope.
5621 if (D.getCXXScopeSpec().isEmpty())
5622 CheckShadow(S, NewVD, Previous);
5624 // Don't consider existing declarations that are in a different
5625 // scope and are out-of-semantic-context declarations (if the new
5626 // declaration has linkage).
5627 FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewVD),
5628 D.getCXXScopeSpec().isNotEmpty() ||
5629 IsExplicitSpecialization ||
5630 IsVariableTemplateSpecialization);
5632 // Check whether the previous declaration is in the same block scope. This
5633 // affects whether we merge types with it, per C++11 [dcl.array]p3.
5634 if (getLangOpts().CPlusPlus &&
5635 NewVD->isLocalVarDecl() && NewVD->hasExternalStorage())
5636 NewVD->setPreviousDeclInSameBlockScope(
5637 Previous.isSingleResult() && !Previous.isShadowed() &&
5638 isDeclInScope(Previous.getFoundDecl(), OriginalDC, S, false));
5640 if (!getLangOpts().CPlusPlus) {
5641 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
5643 // If this is an explicit specialization of a static data member, check it.
5644 if (IsExplicitSpecialization && !NewVD->isInvalidDecl() &&
5645 CheckMemberSpecialization(NewVD, Previous))
5646 NewVD->setInvalidDecl();
5648 // Merge the decl with the existing one if appropriate.
5649 if (!Previous.empty()) {
5650 if (Previous.isSingleResult() &&
5651 isa<FieldDecl>(Previous.getFoundDecl()) &&
5652 D.getCXXScopeSpec().isSet()) {
5653 // The user tried to define a non-static data member
5654 // out-of-line (C++ [dcl.meaning]p1).
5655 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
5656 << D.getCXXScopeSpec().getRange();
5658 NewVD->setInvalidDecl();
5660 } else if (D.getCXXScopeSpec().isSet()) {
5661 // No previous declaration in the qualifying scope.
5662 Diag(D.getIdentifierLoc(), diag::err_no_member)
5663 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
5664 << D.getCXXScopeSpec().getRange();
5665 NewVD->setInvalidDecl();
5668 if (!IsVariableTemplateSpecialization)
5669 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
5672 VarTemplateDecl *PrevVarTemplate =
5673 NewVD->getPreviousDecl()
5674 ? NewVD->getPreviousDecl()->getDescribedVarTemplate()
5677 // Check the template parameter list of this declaration, possibly
5678 // merging in the template parameter list from the previous variable
5679 // template declaration.
5680 if (CheckTemplateParameterList(
5682 PrevVarTemplate ? PrevVarTemplate->getTemplateParameters()
5684 (D.getCXXScopeSpec().isSet() && DC && DC->isRecord() &&
5685 DC->isDependentContext())
5686 ? TPC_ClassTemplateMember
5688 NewVD->setInvalidDecl();
5690 // If we are providing an explicit specialization of a static variable
5691 // template, make a note of that.
5692 if (PrevVarTemplate &&
5693 PrevVarTemplate->getInstantiatedFromMemberTemplate())
5694 PrevVarTemplate->setMemberSpecialization();
5698 ProcessPragmaWeak(S, NewVD);
5700 // If this is the first declaration of an extern C variable, update
5701 // the map of such variables.
5702 if (NewVD->isFirstDecl() && !NewVD->isInvalidDecl() &&
5703 isIncompleteDeclExternC(*this, NewVD))
5704 RegisterLocallyScopedExternCDecl(NewVD, S);
5706 if (getLangOpts().CPlusPlus && NewVD->isStaticLocal()) {
5707 Decl *ManglingContextDecl;
5708 if (MangleNumberingContext *MCtx =
5709 getCurrentMangleNumberContext(NewVD->getDeclContext(),
5710 ManglingContextDecl)) {
5711 Context.setManglingNumber(
5712 NewVD, MCtx->getManglingNumber(NewVD, S->getMSLocalManglingNumber()));
5713 Context.setStaticLocalNumber(NewVD, MCtx->getStaticLocalNumber(NewVD));
5717 if (D.isRedeclaration() && !Previous.empty()) {
5718 checkDLLAttributeRedeclaration(
5719 *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewVD,
5720 IsExplicitSpecialization);
5724 if (NewVD->isInvalidDecl())
5725 NewTemplate->setInvalidDecl();
5726 ActOnDocumentableDecl(NewTemplate);
5733 /// \brief Diagnose variable or built-in function shadowing. Implements
5736 /// This method is called whenever a VarDecl is added to a "useful"
5739 /// \param S the scope in which the shadowing name is being declared
5740 /// \param R the lookup of the name
5742 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
5743 // Return if warning is ignored.
5744 if (Diags.isIgnored(diag::warn_decl_shadow, R.getNameLoc()))
5747 // Don't diagnose declarations at file scope.
5748 if (D->hasGlobalStorage())
5751 DeclContext *NewDC = D->getDeclContext();
5753 // Only diagnose if we're shadowing an unambiguous field or variable.
5754 if (R.getResultKind() != LookupResult::Found)
5757 NamedDecl* ShadowedDecl = R.getFoundDecl();
5758 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
5761 // Fields are not shadowed by variables in C++ static methods.
5762 if (isa<FieldDecl>(ShadowedDecl))
5763 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
5767 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
5768 if (shadowedVar->isExternC()) {
5769 // For shadowing external vars, make sure that we point to the global
5770 // declaration, not a locally scoped extern declaration.
5771 for (auto I : shadowedVar->redecls())
5772 if (I->isFileVarDecl()) {
5778 DeclContext *OldDC = ShadowedDecl->getDeclContext();
5780 // Only warn about certain kinds of shadowing for class members.
5781 if (NewDC && NewDC->isRecord()) {
5782 // In particular, don't warn about shadowing non-class members.
5783 if (!OldDC->isRecord())
5786 // TODO: should we warn about static data members shadowing
5787 // static data members from base classes?
5789 // TODO: don't diagnose for inaccessible shadowed members.
5790 // This is hard to do perfectly because we might friend the
5791 // shadowing context, but that's just a false negative.
5794 // Determine what kind of declaration we're shadowing.
5796 if (isa<RecordDecl>(OldDC)) {
5797 if (isa<FieldDecl>(ShadowedDecl))
5800 Kind = 2; // static data member
5801 } else if (OldDC->isFileContext())
5806 DeclarationName Name = R.getLookupName();
5808 // Emit warning and note.
5809 if (getSourceManager().isInSystemMacro(R.getNameLoc()))
5811 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
5812 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
5815 /// \brief Check -Wshadow without the advantage of a previous lookup.
5816 void Sema::CheckShadow(Scope *S, VarDecl *D) {
5817 if (Diags.isIgnored(diag::warn_decl_shadow, D->getLocation()))
5820 LookupResult R(*this, D->getDeclName(), D->getLocation(),
5821 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
5823 CheckShadow(S, D, R);
5826 /// Check for conflict between this global or extern "C" declaration and
5827 /// previous global or extern "C" declarations. This is only used in C++.
5828 template<typename T>
5829 static bool checkGlobalOrExternCConflict(
5830 Sema &S, const T *ND, bool IsGlobal, LookupResult &Previous) {
5831 assert(S.getLangOpts().CPlusPlus && "only C++ has extern \"C\"");
5832 NamedDecl *Prev = S.findLocallyScopedExternCDecl(ND->getDeclName());
5834 if (!Prev && IsGlobal && !isIncompleteDeclExternC(S, ND)) {
5835 // The common case: this global doesn't conflict with any extern "C"
5841 if (!IsGlobal || isIncompleteDeclExternC(S, ND)) {
5842 // Both the old and new declarations have C language linkage. This is a
5845 Previous.addDecl(Prev);
5849 // This is a global, non-extern "C" declaration, and there is a previous
5850 // non-global extern "C" declaration. Diagnose if this is a variable
5852 if (!isa<VarDecl>(ND))
5855 // The declaration is extern "C". Check for any declaration in the
5856 // translation unit which might conflict.
5858 // We have already performed the lookup into the translation unit.
5860 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
5862 if (isa<VarDecl>(*I)) {
5868 DeclContext::lookup_result R =
5869 S.Context.getTranslationUnitDecl()->lookup(ND->getDeclName());
5870 for (DeclContext::lookup_result::iterator I = R.begin(), E = R.end();
5872 if (isa<VarDecl>(*I)) {
5876 // FIXME: If we have any other entity with this name in global scope,
5877 // the declaration is ill-formed, but that is a defect: it breaks the
5878 // 'stat' hack, for instance. Only variables can have mangled name
5879 // clashes with extern "C" declarations, so only they deserve a
5888 // Use the first declaration's location to ensure we point at something which
5889 // is lexically inside an extern "C" linkage-spec.
5890 assert(Prev && "should have found a previous declaration to diagnose");
5891 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Prev))
5892 Prev = FD->getFirstDecl();
5894 Prev = cast<VarDecl>(Prev)->getFirstDecl();
5896 S.Diag(ND->getLocation(), diag::err_extern_c_global_conflict)
5898 S.Diag(Prev->getLocation(), diag::note_extern_c_global_conflict)
5903 /// Apply special rules for handling extern "C" declarations. Returns \c true
5904 /// if we have found that this is a redeclaration of some prior entity.
5906 /// Per C++ [dcl.link]p6:
5907 /// Two declarations [for a function or variable] with C language linkage
5908 /// with the same name that appear in different scopes refer to the same
5909 /// [entity]. An entity with C language linkage shall not be declared with
5910 /// the same name as an entity in global scope.
5911 template<typename T>
5912 static bool checkForConflictWithNonVisibleExternC(Sema &S, const T *ND,
5913 LookupResult &Previous) {
5914 if (!S.getLangOpts().CPlusPlus) {
5915 // In C, when declaring a global variable, look for a corresponding 'extern'
5916 // variable declared in function scope. We don't need this in C++, because
5917 // we find local extern decls in the surrounding file-scope DeclContext.
5918 if (ND->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
5919 if (NamedDecl *Prev = S.findLocallyScopedExternCDecl(ND->getDeclName())) {
5921 Previous.addDecl(Prev);
5928 // A declaration in the translation unit can conflict with an extern "C"
5930 if (ND->getDeclContext()->getRedeclContext()->isTranslationUnit())
5931 return checkGlobalOrExternCConflict(S, ND, /*IsGlobal*/true, Previous);
5933 // An extern "C" declaration can conflict with a declaration in the
5934 // translation unit or can be a redeclaration of an extern "C" declaration
5935 // in another scope.
5936 if (isIncompleteDeclExternC(S,ND))
5937 return checkGlobalOrExternCConflict(S, ND, /*IsGlobal*/false, Previous);
5939 // Neither global nor extern "C": nothing to do.
5943 void Sema::CheckVariableDeclarationType(VarDecl *NewVD) {
5944 // If the decl is already known invalid, don't check it.
5945 if (NewVD->isInvalidDecl())
5948 TypeSourceInfo *TInfo = NewVD->getTypeSourceInfo();
5949 QualType T = TInfo->getType();
5951 // Defer checking an 'auto' type until its initializer is attached.
5952 if (T->isUndeducedType())
5955 if (NewVD->hasAttrs())
5956 CheckAlignasUnderalignment(NewVD);
5958 if (T->isObjCObjectType()) {
5959 Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
5960 << FixItHint::CreateInsertion(NewVD->getLocation(), "*");
5961 T = Context.getObjCObjectPointerType(T);
5965 // Emit an error if an address space was applied to decl with local storage.
5966 // This includes arrays of objects with address space qualifiers, but not
5967 // automatic variables that point to other address spaces.
5968 // ISO/IEC TR 18037 S5.1.2
5969 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
5970 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
5971 NewVD->setInvalidDecl();
5975 // OpenCL v1.2 s6.5 - All program scope variables must be declared in the
5976 // __constant address space.
5977 if (getLangOpts().OpenCL && NewVD->isFileVarDecl()
5978 && T.getAddressSpace() != LangAS::opencl_constant
5979 && !T->isSamplerT()){
5980 Diag(NewVD->getLocation(), diag::err_opencl_global_invalid_addr_space);
5981 NewVD->setInvalidDecl();
5985 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program
5987 if ((getLangOpts().OpenCLVersion >= 120)
5988 && NewVD->isStaticLocal()) {
5989 Diag(NewVD->getLocation(), diag::err_static_function_scope);
5990 NewVD->setInvalidDecl();
5994 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
5995 && !NewVD->hasAttr<BlocksAttr>()) {
5996 if (getLangOpts().getGC() != LangOptions::NonGC)
5997 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
5999 assert(!getLangOpts().ObjCAutoRefCount);
6000 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
6004 bool isVM = T->isVariablyModifiedType();
6005 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
6006 NewVD->hasAttr<BlocksAttr>())
6007 getCurFunction()->setHasBranchProtectedScope();
6009 if ((isVM && NewVD->hasLinkage()) ||
6010 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
6011 bool SizeIsNegative;
6012 llvm::APSInt Oversized;
6013 TypeSourceInfo *FixedTInfo =
6014 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
6015 SizeIsNegative, Oversized);
6016 if (!FixedTInfo && T->isVariableArrayType()) {
6017 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
6018 // FIXME: This won't give the correct result for
6020 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
6022 if (NewVD->isFileVarDecl())
6023 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
6025 else if (NewVD->isStaticLocal())
6026 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
6029 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
6031 NewVD->setInvalidDecl();
6036 if (NewVD->isFileVarDecl())
6037 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
6039 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
6040 NewVD->setInvalidDecl();
6044 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
6045 NewVD->setType(FixedTInfo->getType());
6046 NewVD->setTypeSourceInfo(FixedTInfo);
6049 if (T->isVoidType()) {
6050 // C++98 [dcl.stc]p5: The extern specifier can be applied only to the names
6051 // of objects and functions.
6052 if (NewVD->isThisDeclarationADefinition() || getLangOpts().CPlusPlus) {
6053 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
6055 NewVD->setInvalidDecl();
6060 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
6061 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
6062 NewVD->setInvalidDecl();
6066 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
6067 Diag(NewVD->getLocation(), diag::err_block_on_vm);
6068 NewVD->setInvalidDecl();
6072 if (NewVD->isConstexpr() && !T->isDependentType() &&
6073 RequireLiteralType(NewVD->getLocation(), T,
6074 diag::err_constexpr_var_non_literal)) {
6075 NewVD->setInvalidDecl();
6080 /// \brief Perform semantic checking on a newly-created variable
6083 /// This routine performs all of the type-checking required for a
6084 /// variable declaration once it has been built. It is used both to
6085 /// check variables after they have been parsed and their declarators
6086 /// have been translated into a declaration, and to check variables
6087 /// that have been instantiated from a template.
6089 /// Sets NewVD->isInvalidDecl() if an error was encountered.
6091 /// Returns true if the variable declaration is a redeclaration.
6092 bool Sema::CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous) {
6093 CheckVariableDeclarationType(NewVD);
6095 // If the decl is already known invalid, don't check it.
6096 if (NewVD->isInvalidDecl())
6099 // If we did not find anything by this name, look for a non-visible
6100 // extern "C" declaration with the same name.
6101 if (Previous.empty() &&
6102 checkForConflictWithNonVisibleExternC(*this, NewVD, Previous))
6103 Previous.setShadowed();
6105 // Filter out any non-conflicting previous declarations.
6106 filterNonConflictingPreviousDecls(Context, NewVD, Previous);
6108 if (!Previous.empty()) {
6109 MergeVarDecl(NewVD, Previous);
6115 /// \brief Data used with FindOverriddenMethod
6116 struct FindOverriddenMethodData {
6118 CXXMethodDecl *Method;
6121 /// \brief Member lookup function that determines whether a given C++
6122 /// method overrides a method in a base class, to be used with
6123 /// CXXRecordDecl::lookupInBases().
6124 static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
6127 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
6129 FindOverriddenMethodData *Data
6130 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
6132 DeclarationName Name = Data->Method->getDeclName();
6134 // FIXME: Do we care about other names here too?
6135 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
6136 // We really want to find the base class destructor here.
6137 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
6138 CanQualType CT = Data->S->Context.getCanonicalType(T);
6140 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
6143 for (Path.Decls = BaseRecord->lookup(Name);
6144 !Path.Decls.empty();
6145 Path.Decls = Path.Decls.slice(1)) {
6146 NamedDecl *D = Path.Decls.front();
6147 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
6148 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
6157 enum OverrideErrorKind { OEK_All, OEK_NonDeleted, OEK_Deleted };
6159 /// \brief Report an error regarding overriding, along with any relevant
6160 /// overriden methods.
6162 /// \param DiagID the primary error to report.
6163 /// \param MD the overriding method.
6164 /// \param OEK which overrides to include as notes.
6165 static void ReportOverrides(Sema& S, unsigned DiagID, const CXXMethodDecl *MD,
6166 OverrideErrorKind OEK = OEK_All) {
6167 S.Diag(MD->getLocation(), DiagID) << MD->getDeclName();
6168 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
6169 E = MD->end_overridden_methods();
6171 // This check (& the OEK parameter) could be replaced by a predicate, but
6172 // without lambdas that would be overkill. This is still nicer than writing
6173 // out the diag loop 3 times.
6174 if ((OEK == OEK_All) ||
6175 (OEK == OEK_NonDeleted && !(*I)->isDeleted()) ||
6176 (OEK == OEK_Deleted && (*I)->isDeleted()))
6177 S.Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
6181 /// AddOverriddenMethods - See if a method overrides any in the base classes,
6182 /// and if so, check that it's a valid override and remember it.
6183 bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
6184 // Look for virtual methods in base classes that this method might override.
6186 FindOverriddenMethodData Data;
6189 bool hasDeletedOverridenMethods = false;
6190 bool hasNonDeletedOverridenMethods = false;
6191 bool AddedAny = false;
6192 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
6193 for (auto *I : Paths.found_decls()) {
6194 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(I)) {
6195 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
6196 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
6197 !CheckOverridingFunctionAttributes(MD, OldMD) &&
6198 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
6199 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
6200 hasDeletedOverridenMethods |= OldMD->isDeleted();
6201 hasNonDeletedOverridenMethods |= !OldMD->isDeleted();
6208 if (hasDeletedOverridenMethods && !MD->isDeleted()) {
6209 ReportOverrides(*this, diag::err_non_deleted_override, MD, OEK_Deleted);
6211 if (hasNonDeletedOverridenMethods && MD->isDeleted()) {
6212 ReportOverrides(*this, diag::err_deleted_override, MD, OEK_NonDeleted);
6219 // Struct for holding all of the extra arguments needed by
6220 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
6221 struct ActOnFDArgs {
6224 MultiTemplateParamsArg TemplateParamLists;
6231 // Callback to only accept typo corrections that have a non-zero edit distance.
6232 // Also only accept corrections that have the same parent decl.
6233 class DifferentNameValidatorCCC : public CorrectionCandidateCallback {
6235 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD,
6236 CXXRecordDecl *Parent)
6237 : Context(Context), OriginalFD(TypoFD),
6238 ExpectedParent(Parent ? Parent->getCanonicalDecl() : nullptr) {}
6240 bool ValidateCandidate(const TypoCorrection &candidate) override {
6241 if (candidate.getEditDistance() == 0)
6244 SmallVector<unsigned, 1> MismatchedParams;
6245 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(),
6246 CDeclEnd = candidate.end();
6247 CDecl != CDeclEnd; ++CDecl) {
6248 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
6250 if (FD && !FD->hasBody() &&
6251 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) {
6252 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
6253 CXXRecordDecl *Parent = MD->getParent();
6254 if (Parent && Parent->getCanonicalDecl() == ExpectedParent)
6256 } else if (!ExpectedParent) {
6266 ASTContext &Context;
6267 FunctionDecl *OriginalFD;
6268 CXXRecordDecl *ExpectedParent;
6273 /// \brief Generate diagnostics for an invalid function redeclaration.
6275 /// This routine handles generating the diagnostic messages for an invalid
6276 /// function redeclaration, including finding possible similar declarations
6277 /// or performing typo correction if there are no previous declarations with
6280 /// Returns a NamedDecl iff typo correction was performed and substituting in
6281 /// the new declaration name does not cause new errors.
6282 static NamedDecl *DiagnoseInvalidRedeclaration(
6283 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
6284 ActOnFDArgs &ExtraArgs, bool IsLocalFriend, Scope *S) {
6285 DeclarationName Name = NewFD->getDeclName();
6286 DeclContext *NewDC = NewFD->getDeclContext();
6287 SmallVector<unsigned, 1> MismatchedParams;
6288 SmallVector<std::pair<FunctionDecl *, unsigned>, 1> NearMatches;
6289 TypoCorrection Correction;
6290 bool IsDefinition = ExtraArgs.D.isFunctionDefinition();
6291 unsigned DiagMsg = IsLocalFriend ? diag::err_no_matching_local_friend
6292 : diag::err_member_decl_does_not_match;
6293 LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
6294 IsLocalFriend ? Sema::LookupLocalFriendName
6295 : Sema::LookupOrdinaryName,
6296 Sema::ForRedeclaration);
6298 NewFD->setInvalidDecl();
6300 SemaRef.LookupName(Prev, S);
6302 SemaRef.LookupQualifiedName(Prev, NewDC);
6303 assert(!Prev.isAmbiguous() &&
6304 "Cannot have an ambiguity in previous-declaration lookup");
6305 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
6306 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD,
6307 MD ? MD->getParent() : nullptr);
6308 if (!Prev.empty()) {
6309 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
6310 Func != FuncEnd; ++Func) {
6311 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
6313 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
6314 // Add 1 to the index so that 0 can mean the mismatch didn't
6315 // involve a parameter
6317 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
6318 NearMatches.push_back(std::make_pair(FD, ParamNum));
6321 // If the qualified name lookup yielded nothing, try typo correction
6322 } else if ((Correction = SemaRef.CorrectTypo(
6323 Prev.getLookupNameInfo(), Prev.getLookupKind(), S,
6324 &ExtraArgs.D.getCXXScopeSpec(), Validator,
6325 Sema::CTK_ErrorRecovery, IsLocalFriend ? nullptr : NewDC))) {
6326 // Set up everything for the call to ActOnFunctionDeclarator
6327 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
6328 ExtraArgs.D.getIdentifierLoc());
6330 Previous.setLookupName(Correction.getCorrection());
6331 for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
6332 CDeclEnd = Correction.end();
6333 CDecl != CDeclEnd; ++CDecl) {
6334 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
6335 if (FD && !FD->hasBody() &&
6336 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
6337 Previous.addDecl(FD);
6340 bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
6343 // Retry building the function declaration with the new previous
6344 // declarations, and with errors suppressed.
6347 Sema::SFINAETrap Trap(SemaRef);
6349 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the
6350 // pieces need to verify the typo-corrected C++ declaration and hopefully
6351 // eliminate the need for the parameter pack ExtraArgs.
6352 Result = SemaRef.ActOnFunctionDeclarator(
6353 ExtraArgs.S, ExtraArgs.D,
6354 Correction.getCorrectionDecl()->getDeclContext(),
6355 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists,
6356 ExtraArgs.AddToScope);
6358 if (Trap.hasErrorOccurred())
6363 // Determine which correction we picked.
6364 Decl *Canonical = Result->getCanonicalDecl();
6365 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6367 if ((*I)->getCanonicalDecl() == Canonical)
6368 Correction.setCorrectionDecl(*I);
6370 SemaRef.diagnoseTypo(
6372 SemaRef.PDiag(IsLocalFriend
6373 ? diag::err_no_matching_local_friend_suggest
6374 : diag::err_member_decl_does_not_match_suggest)
6375 << Name << NewDC << IsDefinition);
6379 // Pretend the typo correction never occurred
6380 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
6381 ExtraArgs.D.getIdentifierLoc());
6382 ExtraArgs.D.setRedeclaration(wasRedeclaration);
6384 Previous.setLookupName(Name);
6387 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
6388 << Name << NewDC << IsDefinition << NewFD->getLocation();
6390 bool NewFDisConst = false;
6391 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
6392 NewFDisConst = NewMD->isConst();
6394 for (SmallVectorImpl<std::pair<FunctionDecl *, unsigned> >::iterator
6395 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
6396 NearMatch != NearMatchEnd; ++NearMatch) {
6397 FunctionDecl *FD = NearMatch->first;
6398 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
6399 bool FDisConst = MD && MD->isConst();
6400 bool IsMember = MD || !IsLocalFriend;
6402 // FIXME: These notes are poorly worded for the local friend case.
6403 if (unsigned Idx = NearMatch->second) {
6404 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
6405 SourceLocation Loc = FDParam->getTypeSpecStartLoc();
6406 if (Loc.isInvalid()) Loc = FD->getLocation();
6407 SemaRef.Diag(Loc, IsMember ? diag::note_member_def_close_param_match
6408 : diag::note_local_decl_close_param_match)
6409 << Idx << FDParam->getType()
6410 << NewFD->getParamDecl(Idx - 1)->getType();
6411 } else if (FDisConst != NewFDisConst) {
6412 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
6413 << NewFDisConst << FD->getSourceRange().getEnd();
6415 SemaRef.Diag(FD->getLocation(),
6416 IsMember ? diag::note_member_def_close_match
6417 : diag::note_local_decl_close_match);
6422 static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef,
6424 switch (D.getDeclSpec().getStorageClassSpec()) {
6425 default: llvm_unreachable("Unknown storage class!");
6426 case DeclSpec::SCS_auto:
6427 case DeclSpec::SCS_register:
6428 case DeclSpec::SCS_mutable:
6429 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6430 diag::err_typecheck_sclass_func);
6433 case DeclSpec::SCS_unspecified: break;
6434 case DeclSpec::SCS_extern:
6435 if (D.getDeclSpec().isExternInLinkageSpec())
6438 case DeclSpec::SCS_static: {
6439 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
6441 // The declaration of an identifier for a function that has
6442 // block scope shall have no explicit storage-class specifier
6443 // other than extern
6444 // See also (C++ [dcl.stc]p4).
6445 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6446 diag::err_static_block_func);
6451 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
6454 // No explicit storage class has already been returned
6458 static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
6459 DeclContext *DC, QualType &R,
6460 TypeSourceInfo *TInfo,
6461 FunctionDecl::StorageClass SC,
6462 bool &IsVirtualOkay) {
6463 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
6464 DeclarationName Name = NameInfo.getName();
6466 FunctionDecl *NewFD = nullptr;
6467 bool isInline = D.getDeclSpec().isInlineSpecified();
6469 if (!SemaRef.getLangOpts().CPlusPlus) {
6470 // Determine whether the function was written with a
6471 // prototype. This true when:
6472 // - there is a prototype in the declarator, or
6473 // - the type R of the function is some kind of typedef or other reference
6474 // to a type name (which eventually refers to a function type).
6476 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
6477 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
6479 NewFD = FunctionDecl::Create(SemaRef.Context, DC,
6480 D.getLocStart(), NameInfo, R,
6481 TInfo, SC, isInline,
6482 HasPrototype, false);
6483 if (D.isInvalidType())
6484 NewFD->setInvalidDecl();
6486 // Set the lexical context.
6487 NewFD->setLexicalDeclContext(SemaRef.CurContext);
6492 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
6493 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
6495 // Check that the return type is not an abstract class type.
6496 // For record types, this is done by the AbstractClassUsageDiagnoser once
6497 // the class has been completely parsed.
6498 if (!DC->isRecord() &&
6499 SemaRef.RequireNonAbstractType(
6500 D.getIdentifierLoc(), R->getAs<FunctionType>()->getReturnType(),
6501 diag::err_abstract_type_in_decl, SemaRef.AbstractReturnType))
6504 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
6505 // This is a C++ constructor declaration.
6506 assert(DC->isRecord() &&
6507 "Constructors can only be declared in a member context");
6509 R = SemaRef.CheckConstructorDeclarator(D, R, SC);
6510 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
6511 D.getLocStart(), NameInfo,
6512 R, TInfo, isExplicit, isInline,
6513 /*isImplicitlyDeclared=*/false,
6516 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
6517 // This is a C++ destructor declaration.
6518 if (DC->isRecord()) {
6519 R = SemaRef.CheckDestructorDeclarator(D, R, SC);
6520 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
6521 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
6522 SemaRef.Context, Record,
6524 NameInfo, R, TInfo, isInline,
6525 /*isImplicitlyDeclared=*/false);
6527 // If the class is complete, then we now create the implicit exception
6528 // specification. If the class is incomplete or dependent, we can't do
6530 if (SemaRef.getLangOpts().CPlusPlus11 && !Record->isDependentType() &&
6531 Record->getDefinition() && !Record->isBeingDefined() &&
6532 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
6533 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
6536 IsVirtualOkay = true;
6540 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
6543 // Create a FunctionDecl to satisfy the function definition parsing
6545 return FunctionDecl::Create(SemaRef.Context, DC,
6547 D.getIdentifierLoc(), Name, R, TInfo,
6549 /*hasPrototype=*/true, isConstexpr);
6552 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
6553 if (!DC->isRecord()) {
6554 SemaRef.Diag(D.getIdentifierLoc(),
6555 diag::err_conv_function_not_member);
6559 SemaRef.CheckConversionDeclarator(D, R, SC);
6560 IsVirtualOkay = true;
6561 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
6562 D.getLocStart(), NameInfo,
6563 R, TInfo, isInline, isExplicit,
6564 isConstexpr, SourceLocation());
6566 } else if (DC->isRecord()) {
6567 // If the name of the function is the same as the name of the record,
6568 // then this must be an invalid constructor that has a return type.
6569 // (The parser checks for a return type and makes the declarator a
6570 // constructor if it has no return type).
6571 if (Name.getAsIdentifierInfo() &&
6572 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
6573 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
6574 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
6575 << SourceRange(D.getIdentifierLoc());
6579 // This is a C++ method declaration.
6580 CXXMethodDecl *Ret = CXXMethodDecl::Create(SemaRef.Context,
6581 cast<CXXRecordDecl>(DC),
6582 D.getLocStart(), NameInfo, R,
6583 TInfo, SC, isInline,
6584 isConstexpr, SourceLocation());
6585 IsVirtualOkay = !Ret->isStatic();
6588 // Determine whether the function was written with a
6589 // prototype. This true when:
6590 // - we're in C++ (where every function has a prototype),
6591 return FunctionDecl::Create(SemaRef.Context, DC,
6593 NameInfo, R, TInfo, SC, isInline,
6594 true/*HasPrototype*/, isConstexpr);
6598 enum OpenCLParamType {
6602 PrivatePtrKernelParam,
6607 static OpenCLParamType getOpenCLKernelParameterType(QualType PT) {
6608 if (PT->isPointerType()) {
6609 QualType PointeeType = PT->getPointeeType();
6610 if (PointeeType->isPointerType())
6611 return PtrPtrKernelParam;
6612 return PointeeType.getAddressSpace() == 0 ? PrivatePtrKernelParam
6616 // TODO: Forbid the other integer types (size_t, ptrdiff_t...) when they can
6617 // be used as builtin types.
6619 if (PT->isImageType())
6620 return PtrKernelParam;
6622 if (PT->isBooleanType())
6623 return InvalidKernelParam;
6626 return InvalidKernelParam;
6628 if (PT->isHalfType())
6629 return InvalidKernelParam;
6631 if (PT->isRecordType())
6632 return RecordKernelParam;
6634 return ValidKernelParam;
6637 static void checkIsValidOpenCLKernelParameter(
6641 llvm::SmallPtrSet<const Type *, 16> &ValidTypes) {
6642 QualType PT = Param->getType();
6644 // Cache the valid types we encounter to avoid rechecking structs that are
6646 if (ValidTypes.count(PT.getTypePtr()))
6649 switch (getOpenCLKernelParameterType(PT)) {
6650 case PtrPtrKernelParam:
6651 // OpenCL v1.2 s6.9.a:
6652 // A kernel function argument cannot be declared as a
6653 // pointer to a pointer type.
6654 S.Diag(Param->getLocation(), diag::err_opencl_ptrptr_kernel_param);
6658 case PrivatePtrKernelParam:
6659 // OpenCL v1.2 s6.9.a:
6660 // A kernel function argument cannot be declared as a
6661 // pointer to the private address space.
6662 S.Diag(Param->getLocation(), diag::err_opencl_private_ptr_kernel_param);
6666 // OpenCL v1.2 s6.9.k:
6667 // Arguments to kernel functions in a program cannot be declared with the
6668 // built-in scalar types bool, half, size_t, ptrdiff_t, intptr_t, and
6669 // uintptr_t or a struct and/or union that contain fields declared to be
6670 // one of these built-in scalar types.
6672 case InvalidKernelParam:
6673 // OpenCL v1.2 s6.8 n:
6674 // A kernel function argument cannot be declared
6676 S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT;
6680 case PtrKernelParam:
6681 case ValidKernelParam:
6682 ValidTypes.insert(PT.getTypePtr());
6685 case RecordKernelParam:
6689 // Track nested structs we will inspect
6690 SmallVector<const Decl *, 4> VisitStack;
6692 // Track where we are in the nested structs. Items will migrate from
6693 // VisitStack to HistoryStack as we do the DFS for bad field.
6694 SmallVector<const FieldDecl *, 4> HistoryStack;
6695 HistoryStack.push_back(nullptr);
6697 const RecordDecl *PD = PT->castAs<RecordType>()->getDecl();
6698 VisitStack.push_back(PD);
6700 assert(VisitStack.back() && "First decl null?");
6703 const Decl *Next = VisitStack.pop_back_val();
6705 assert(!HistoryStack.empty());
6706 // Found a marker, we have gone up a level
6707 if (const FieldDecl *Hist = HistoryStack.pop_back_val())
6708 ValidTypes.insert(Hist->getType().getTypePtr());
6713 // Adds everything except the original parameter declaration (which is not a
6714 // field itself) to the history stack.
6715 const RecordDecl *RD;
6716 if (const FieldDecl *Field = dyn_cast<FieldDecl>(Next)) {
6717 HistoryStack.push_back(Field);
6718 RD = Field->getType()->castAs<RecordType>()->getDecl();
6720 RD = cast<RecordDecl>(Next);
6723 // Add a null marker so we know when we've gone back up a level
6724 VisitStack.push_back(nullptr);
6726 for (const auto *FD : RD->fields()) {
6727 QualType QT = FD->getType();
6729 if (ValidTypes.count(QT.getTypePtr()))
6732 OpenCLParamType ParamType = getOpenCLKernelParameterType(QT);
6733 if (ParamType == ValidKernelParam)
6736 if (ParamType == RecordKernelParam) {
6737 VisitStack.push_back(FD);
6741 // OpenCL v1.2 s6.9.p:
6742 // Arguments to kernel functions that are declared to be a struct or union
6743 // do not allow OpenCL objects to be passed as elements of the struct or
6745 if (ParamType == PtrKernelParam || ParamType == PtrPtrKernelParam ||
6746 ParamType == PrivatePtrKernelParam) {
6747 S.Diag(Param->getLocation(),
6748 diag::err_record_with_pointers_kernel_param)
6749 << PT->isUnionType()
6752 S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT;
6755 S.Diag(PD->getLocation(), diag::note_within_field_of_type)
6756 << PD->getDeclName();
6758 // We have an error, now let's go back up through history and show where
6759 // the offending field came from
6760 for (ArrayRef<const FieldDecl *>::const_iterator I = HistoryStack.begin() + 1,
6761 E = HistoryStack.end(); I != E; ++I) {
6762 const FieldDecl *OuterField = *I;
6763 S.Diag(OuterField->getLocation(), diag::note_within_field_of_type)
6764 << OuterField->getType();
6767 S.Diag(FD->getLocation(), diag::note_illegal_field_declared_here)
6768 << QT->isPointerType()
6773 } while (!VisitStack.empty());
6777 Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
6778 TypeSourceInfo *TInfo, LookupResult &Previous,
6779 MultiTemplateParamsArg TemplateParamLists,
6781 QualType R = TInfo->getType();
6783 assert(R.getTypePtr()->isFunctionType());
6785 // TODO: consider using NameInfo for diagnostic.
6786 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
6787 DeclarationName Name = NameInfo.getName();
6788 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D);
6790 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
6791 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
6792 diag::err_invalid_thread)
6793 << DeclSpec::getSpecifierName(TSCS);
6795 if (D.isFirstDeclarationOfMember())
6796 adjustMemberFunctionCC(R, D.isStaticMember());
6798 bool isFriend = false;
6799 FunctionTemplateDecl *FunctionTemplate = nullptr;
6800 bool isExplicitSpecialization = false;
6801 bool isFunctionTemplateSpecialization = false;
6803 bool isDependentClassScopeExplicitSpecialization = false;
6804 bool HasExplicitTemplateArgs = false;
6805 TemplateArgumentListInfo TemplateArgs;
6807 bool isVirtualOkay = false;
6809 DeclContext *OriginalDC = DC;
6810 bool IsLocalExternDecl = adjustContextForLocalExternDecl(DC);
6812 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
6814 if (!NewFD) return nullptr;
6816 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer())
6817 NewFD->setTopLevelDeclInObjCContainer();
6819 // Set the lexical context. If this is a function-scope declaration, or has a
6820 // C++ scope specifier, or is the object of a friend declaration, the lexical
6821 // context will be different from the semantic context.
6822 NewFD->setLexicalDeclContext(CurContext);
6824 if (IsLocalExternDecl)
6825 NewFD->setLocalExternDecl();
6827 if (getLangOpts().CPlusPlus) {
6828 bool isInline = D.getDeclSpec().isInlineSpecified();
6829 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
6830 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
6831 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
6832 isFriend = D.getDeclSpec().isFriendSpecified();
6833 if (isFriend && !isInline && D.isFunctionDefinition()) {
6834 // C++ [class.friend]p5
6835 // A function can be defined in a friend declaration of a
6836 // class . . . . Such a function is implicitly inline.
6837 NewFD->setImplicitlyInline();
6840 // If this is a method defined in an __interface, and is not a constructor
6841 // or an overloaded operator, then set the pure flag (isVirtual will already
6843 if (const CXXRecordDecl *Parent =
6844 dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) {
6845 if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided())
6846 NewFD->setPure(true);
6849 SetNestedNameSpecifier(NewFD, D);
6850 isExplicitSpecialization = false;
6851 isFunctionTemplateSpecialization = false;
6852 if (D.isInvalidType())
6853 NewFD->setInvalidDecl();
6855 // Match up the template parameter lists with the scope specifier, then
6856 // determine whether we have a template or a template specialization.
6857 bool Invalid = false;
6858 if (TemplateParameterList *TemplateParams =
6859 MatchTemplateParametersToScopeSpecifier(
6860 D.getDeclSpec().getLocStart(), D.getIdentifierLoc(),
6861 D.getCXXScopeSpec(),
6862 D.getName().getKind() == UnqualifiedId::IK_TemplateId
6863 ? D.getName().TemplateId
6865 TemplateParamLists, isFriend, isExplicitSpecialization,
6867 if (TemplateParams->size() > 0) {
6868 // This is a function template
6870 // Check that we can declare a template here.
6871 if (CheckTemplateDeclScope(S, TemplateParams))
6874 // A destructor cannot be a template.
6875 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
6876 Diag(NewFD->getLocation(), diag::err_destructor_template);
6880 // If we're adding a template to a dependent context, we may need to
6881 // rebuilding some of the types used within the template parameter list,
6882 // now that we know what the current instantiation is.
6883 if (DC->isDependentContext()) {
6884 ContextRAII SavedContext(*this, DC);
6885 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
6890 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
6891 NewFD->getLocation(),
6892 Name, TemplateParams,
6894 FunctionTemplate->setLexicalDeclContext(CurContext);
6895 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
6897 // For source fidelity, store the other template param lists.
6898 if (TemplateParamLists.size() > 1) {
6899 NewFD->setTemplateParameterListsInfo(Context,
6900 TemplateParamLists.size() - 1,
6901 TemplateParamLists.data());
6904 // This is a function template specialization.
6905 isFunctionTemplateSpecialization = true;
6906 // For source fidelity, store all the template param lists.
6907 if (TemplateParamLists.size() > 0)
6908 NewFD->setTemplateParameterListsInfo(Context,
6909 TemplateParamLists.size(),
6910 TemplateParamLists.data());
6912 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
6914 // We want to remove the "template<>", found here.
6915 SourceRange RemoveRange = TemplateParams->getSourceRange();
6917 // If we remove the template<> and the name is not a
6918 // template-id, we're actually silently creating a problem:
6919 // the friend declaration will refer to an untemplated decl,
6920 // and clearly the user wants a template specialization. So
6921 // we need to insert '<>' after the name.
6922 SourceLocation InsertLoc;
6923 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
6924 InsertLoc = D.getName().getSourceRange().getEnd();
6925 InsertLoc = getLocForEndOfToken(InsertLoc);
6928 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
6929 << Name << RemoveRange
6930 << FixItHint::CreateRemoval(RemoveRange)
6931 << FixItHint::CreateInsertion(InsertLoc, "<>");
6936 // All template param lists were matched against the scope specifier:
6937 // this is NOT (an explicit specialization of) a template.
6938 if (TemplateParamLists.size() > 0)
6939 // For source fidelity, store all the template param lists.
6940 NewFD->setTemplateParameterListsInfo(Context,
6941 TemplateParamLists.size(),
6942 TemplateParamLists.data());
6946 NewFD->setInvalidDecl();
6947 if (FunctionTemplate)
6948 FunctionTemplate->setInvalidDecl();
6951 // C++ [dcl.fct.spec]p5:
6952 // The virtual specifier shall only be used in declarations of
6953 // nonstatic class member functions that appear within a
6954 // member-specification of a class declaration; see 10.3.
6956 if (isVirtual && !NewFD->isInvalidDecl()) {
6957 if (!isVirtualOkay) {
6958 Diag(D.getDeclSpec().getVirtualSpecLoc(),
6959 diag::err_virtual_non_function);
6960 } else if (!CurContext->isRecord()) {
6961 // 'virtual' was specified outside of the class.
6962 Diag(D.getDeclSpec().getVirtualSpecLoc(),
6963 diag::err_virtual_out_of_class)
6964 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
6965 } else if (NewFD->getDescribedFunctionTemplate()) {
6966 // C++ [temp.mem]p3:
6967 // A member function template shall not be virtual.
6968 Diag(D.getDeclSpec().getVirtualSpecLoc(),
6969 diag::err_virtual_member_function_template)
6970 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
6972 // Okay: Add virtual to the method.
6973 NewFD->setVirtualAsWritten(true);
6976 if (getLangOpts().CPlusPlus1y &&
6977 NewFD->getReturnType()->isUndeducedType())
6978 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_auto_fn_virtual);
6981 if (getLangOpts().CPlusPlus1y &&
6982 (NewFD->isDependentContext() ||
6983 (isFriend && CurContext->isDependentContext())) &&
6984 NewFD->getReturnType()->isUndeducedType()) {
6985 // If the function template is referenced directly (for instance, as a
6986 // member of the current instantiation), pretend it has a dependent type.
6987 // This is not really justified by the standard, but is the only sane
6989 // FIXME: For a friend function, we have not marked the function as being
6990 // a friend yet, so 'isDependentContext' on the FD doesn't work.
6991 const FunctionProtoType *FPT =
6992 NewFD->getType()->castAs<FunctionProtoType>();
6994 SubstAutoType(FPT->getReturnType(), Context.DependentTy);
6995 NewFD->setType(Context.getFunctionType(Result, FPT->getParamTypes(),
6996 FPT->getExtProtoInfo()));
6999 // C++ [dcl.fct.spec]p3:
7000 // The inline specifier shall not appear on a block scope function
7002 if (isInline && !NewFD->isInvalidDecl()) {
7003 if (CurContext->isFunctionOrMethod()) {
7004 // 'inline' is not allowed on block scope function declaration.
7005 Diag(D.getDeclSpec().getInlineSpecLoc(),
7006 diag::err_inline_declaration_block_scope) << Name
7007 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
7011 // C++ [dcl.fct.spec]p6:
7012 // The explicit specifier shall be used only in the declaration of a
7013 // constructor or conversion function within its class definition;
7014 // see 12.3.1 and 12.3.2.
7015 if (isExplicit && !NewFD->isInvalidDecl()) {
7016 if (!CurContext->isRecord()) {
7017 // 'explicit' was specified outside of the class.
7018 Diag(D.getDeclSpec().getExplicitSpecLoc(),
7019 diag::err_explicit_out_of_class)
7020 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
7021 } else if (!isa<CXXConstructorDecl>(NewFD) &&
7022 !isa<CXXConversionDecl>(NewFD)) {
7023 // 'explicit' was specified on a function that wasn't a constructor
7024 // or conversion function.
7025 Diag(D.getDeclSpec().getExplicitSpecLoc(),
7026 diag::err_explicit_non_ctor_or_conv_function)
7027 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
7032 // C++11 [dcl.constexpr]p2: constexpr functions and constexpr constructors
7033 // are implicitly inline.
7034 NewFD->setImplicitlyInline();
7036 // C++11 [dcl.constexpr]p3: functions declared constexpr are required to
7037 // be either constructors or to return a literal type. Therefore,
7038 // destructors cannot be declared constexpr.
7039 if (isa<CXXDestructorDecl>(NewFD))
7040 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
7043 // If __module_private__ was specified, mark the function accordingly.
7044 if (D.getDeclSpec().isModulePrivateSpecified()) {
7045 if (isFunctionTemplateSpecialization) {
7046 SourceLocation ModulePrivateLoc
7047 = D.getDeclSpec().getModulePrivateSpecLoc();
7048 Diag(ModulePrivateLoc, diag::err_module_private_specialization)
7050 << FixItHint::CreateRemoval(ModulePrivateLoc);
7052 NewFD->setModulePrivate();
7053 if (FunctionTemplate)
7054 FunctionTemplate->setModulePrivate();
7059 if (FunctionTemplate) {
7060 FunctionTemplate->setObjectOfFriendDecl();
7061 FunctionTemplate->setAccess(AS_public);
7063 NewFD->setObjectOfFriendDecl();
7064 NewFD->setAccess(AS_public);
7067 // If a function is defined as defaulted or deleted, mark it as such now.
7068 // FIXME: Does this ever happen? ActOnStartOfFunctionDef forces the function
7069 // definition kind to FDK_Definition.
7070 switch (D.getFunctionDefinitionKind()) {
7071 case FDK_Declaration:
7072 case FDK_Definition:
7076 NewFD->setDefaulted();
7080 NewFD->setDeletedAsWritten();
7084 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
7085 D.isFunctionDefinition()) {
7086 // C++ [class.mfct]p2:
7087 // A member function may be defined (8.4) in its class definition, in
7088 // which case it is an inline member function (7.1.2)
7089 NewFD->setImplicitlyInline();
7092 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
7093 !CurContext->isRecord()) {
7094 // C++ [class.static]p1:
7095 // A data or function member of a class may be declared static
7096 // in a class definition, in which case it is a static member of
7099 // Complain about the 'static' specifier if it's on an out-of-line
7100 // member function definition.
7101 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
7102 diag::err_static_out_of_line)
7103 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
7106 // C++11 [except.spec]p15:
7107 // A deallocation function with no exception-specification is treated
7108 // as if it were specified with noexcept(true).
7109 const FunctionProtoType *FPT = R->getAs<FunctionProtoType>();
7110 if ((Name.getCXXOverloadedOperator() == OO_Delete ||
7111 Name.getCXXOverloadedOperator() == OO_Array_Delete) &&
7112 getLangOpts().CPlusPlus11 && FPT && !FPT->hasExceptionSpec()) {
7113 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
7114 EPI.ExceptionSpecType = EST_BasicNoexcept;
7115 NewFD->setType(Context.getFunctionType(FPT->getReturnType(),
7116 FPT->getParamTypes(), EPI));
7120 // Filter out previous declarations that don't match the scope.
7121 FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewFD),
7122 D.getCXXScopeSpec().isNotEmpty() ||
7123 isExplicitSpecialization ||
7124 isFunctionTemplateSpecialization);
7126 // Handle GNU asm-label extension (encoded as an attribute).
7127 if (Expr *E = (Expr*) D.getAsmLabel()) {
7128 // The parser guarantees this is a string.
7129 StringLiteral *SE = cast<StringLiteral>(E);
7130 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
7131 SE->getString(), 0));
7132 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
7133 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
7134 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
7135 if (I != ExtnameUndeclaredIdentifiers.end()) {
7136 NewFD->addAttr(I->second);
7137 ExtnameUndeclaredIdentifiers.erase(I);
7141 // Copy the parameter declarations from the declarator D to the function
7142 // declaration NewFD, if they are available. First scavenge them into Params.
7143 SmallVector<ParmVarDecl*, 16> Params;
7144 if (D.isFunctionDeclarator()) {
7145 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
7147 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
7148 // function that takes no arguments, not a function that takes a
7149 // single void argument.
7150 // We let through "const void" here because Sema::GetTypeForDeclarator
7151 // already checks for that case.
7152 if (FTIHasNonVoidParameters(FTI) && FTI.Params[0].Param) {
7153 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
7154 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
7155 assert(Param->getDeclContext() != NewFD && "Was set before ?");
7156 Param->setDeclContext(NewFD);
7157 Params.push_back(Param);
7159 if (Param->isInvalidDecl())
7160 NewFD->setInvalidDecl();
7164 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
7165 // When we're declaring a function with a typedef, typeof, etc as in the
7166 // following example, we'll need to synthesize (unnamed)
7167 // parameters for use in the declaration.
7170 // typedef void fn(int);
7174 // Synthesize a parameter for each argument type.
7175 for (const auto &AI : FT->param_types()) {
7176 ParmVarDecl *Param =
7177 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), AI);
7178 Param->setScopeInfo(0, Params.size());
7179 Params.push_back(Param);
7182 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
7183 "Should not need args for typedef of non-prototype fn");
7186 // Finally, we know we have the right number of parameters, install them.
7187 NewFD->setParams(Params);
7189 // Find all anonymous symbols defined during the declaration of this function
7190 // and add to NewFD. This lets us track decls such 'enum Y' in:
7192 // void f(enum Y {AA} x) {}
7194 // which would otherwise incorrectly end up in the translation unit scope.
7195 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope);
7196 DeclsInPrototypeScope.clear();
7198 if (D.getDeclSpec().isNoreturnSpecified())
7200 ::new(Context) C11NoReturnAttr(D.getDeclSpec().getNoreturnSpecLoc(),
7203 // Functions returning a variably modified type violate C99 6.7.5.2p2
7204 // because all functions have linkage.
7205 if (!NewFD->isInvalidDecl() &&
7206 NewFD->getReturnType()->isVariablyModifiedType()) {
7207 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
7208 NewFD->setInvalidDecl();
7211 if (D.isFunctionDefinition() && CodeSegStack.CurrentValue &&
7212 !NewFD->hasAttr<SectionAttr>()) {
7214 SectionAttr::CreateImplicit(Context, SectionAttr::Declspec_allocate,
7215 CodeSegStack.CurrentValue->getString(),
7216 CodeSegStack.CurrentPragmaLocation));
7217 if (UnifySection(CodeSegStack.CurrentValue->getString(),
7218 PSF_Implicit | PSF_Execute | PSF_Read, NewFD))
7219 NewFD->dropAttr<SectionAttr>();
7222 // Handle attributes.
7223 ProcessDeclAttributes(S, NewFD, D);
7225 QualType RetType = NewFD->getReturnType();
7226 const CXXRecordDecl *Ret = RetType->isRecordType() ?
7227 RetType->getAsCXXRecordDecl() : RetType->getPointeeCXXRecordDecl();
7228 if (!NewFD->isInvalidDecl() && !NewFD->hasAttr<WarnUnusedResultAttr>() &&
7229 Ret && Ret->hasAttr<WarnUnusedResultAttr>()) {
7230 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
7231 // Attach WarnUnusedResult to functions returning types with that attribute.
7232 // Don't apply the attribute to that type's own non-static member functions
7233 // (to avoid warning on things like assignment operators)
7234 if (!MD || MD->getParent() != Ret)
7235 NewFD->addAttr(WarnUnusedResultAttr::CreateImplicit(Context));
7238 if (getLangOpts().OpenCL) {
7239 // OpenCL v1.1 s6.5: Using an address space qualifier in a function return
7240 // type declaration will generate a compilation error.
7241 unsigned AddressSpace = RetType.getAddressSpace();
7242 if (AddressSpace == LangAS::opencl_local ||
7243 AddressSpace == LangAS::opencl_global ||
7244 AddressSpace == LangAS::opencl_constant) {
7245 Diag(NewFD->getLocation(),
7246 diag::err_opencl_return_value_with_address_space);
7247 NewFD->setInvalidDecl();
7251 if (!getLangOpts().CPlusPlus) {
7252 // Perform semantic checking on the function declaration.
7253 bool isExplicitSpecialization=false;
7254 if (!NewFD->isInvalidDecl() && NewFD->isMain())
7255 CheckMain(NewFD, D.getDeclSpec());
7257 if (!NewFD->isInvalidDecl() && NewFD->isMSVCRTEntryPoint())
7258 CheckMSVCRTEntryPoint(NewFD);
7260 if (!NewFD->isInvalidDecl())
7261 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
7262 isExplicitSpecialization));
7263 else if (!Previous.empty())
7264 // Make graceful recovery from an invalid redeclaration.
7265 D.setRedeclaration(true);
7266 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
7267 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
7268 "previous declaration set still overloaded");
7270 // C++11 [replacement.functions]p3:
7271 // The program's definitions shall not be specified as inline.
7273 // N.B. We diagnose declarations instead of definitions per LWG issue 2340.
7275 // Suppress the diagnostic if the function is __attribute__((used)), since
7276 // that forces an external definition to be emitted.
7277 if (D.getDeclSpec().isInlineSpecified() &&
7278 NewFD->isReplaceableGlobalAllocationFunction() &&
7279 !NewFD->hasAttr<UsedAttr>())
7280 Diag(D.getDeclSpec().getInlineSpecLoc(),
7281 diag::ext_operator_new_delete_declared_inline)
7282 << NewFD->getDeclName();
7284 // If the declarator is a template-id, translate the parser's template
7285 // argument list into our AST format.
7286 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
7287 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
7288 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
7289 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
7290 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
7291 TemplateId->NumArgs);
7292 translateTemplateArguments(TemplateArgsPtr,
7295 HasExplicitTemplateArgs = true;
7297 if (NewFD->isInvalidDecl()) {
7298 HasExplicitTemplateArgs = false;
7299 } else if (FunctionTemplate) {
7300 // Function template with explicit template arguments.
7301 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
7302 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
7304 HasExplicitTemplateArgs = false;
7306 assert((isFunctionTemplateSpecialization ||
7307 D.getDeclSpec().isFriendSpecified()) &&
7308 "should have a 'template<>' for this decl");
7309 // "friend void foo<>(int);" is an implicit specialization decl.
7310 isFunctionTemplateSpecialization = true;
7312 } else if (isFriend && isFunctionTemplateSpecialization) {
7313 // This combination is only possible in a recovery case; the user
7314 // wrote something like:
7315 // template <> friend void foo(int);
7316 // which we're recovering from as if the user had written:
7317 // friend void foo<>(int);
7318 // Go ahead and fake up a template id.
7319 HasExplicitTemplateArgs = true;
7320 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
7321 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
7324 // If it's a friend (and only if it's a friend), it's possible
7325 // that either the specialized function type or the specialized
7326 // template is dependent, and therefore matching will fail. In
7327 // this case, don't check the specialization yet.
7328 bool InstantiationDependent = false;
7329 if (isFunctionTemplateSpecialization && isFriend &&
7330 (NewFD->getType()->isDependentType() || DC->isDependentContext() ||
7331 TemplateSpecializationType::anyDependentTemplateArguments(
7332 TemplateArgs.getArgumentArray(), TemplateArgs.size(),
7333 InstantiationDependent))) {
7334 assert(HasExplicitTemplateArgs &&
7335 "friend function specialization without template args");
7336 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
7338 NewFD->setInvalidDecl();
7339 } else if (isFunctionTemplateSpecialization) {
7340 if (CurContext->isDependentContext() && CurContext->isRecord()
7342 isDependentClassScopeExplicitSpecialization = true;
7343 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
7344 diag::ext_function_specialization_in_class :
7345 diag::err_function_specialization_in_class)
7346 << NewFD->getDeclName();
7347 } else if (CheckFunctionTemplateSpecialization(NewFD,
7348 (HasExplicitTemplateArgs ? &TemplateArgs
7351 NewFD->setInvalidDecl();
7354 // A storage-class-specifier shall not be specified in an explicit
7355 // specialization (14.7.3)
7356 FunctionTemplateSpecializationInfo *Info =
7357 NewFD->getTemplateSpecializationInfo();
7358 if (Info && SC != SC_None) {
7359 if (SC != Info->getTemplate()->getTemplatedDecl()->getStorageClass())
7360 Diag(NewFD->getLocation(),
7361 diag::err_explicit_specialization_inconsistent_storage_class)
7363 << FixItHint::CreateRemoval(
7364 D.getDeclSpec().getStorageClassSpecLoc());
7367 Diag(NewFD->getLocation(),
7368 diag::ext_explicit_specialization_storage_class)
7369 << FixItHint::CreateRemoval(
7370 D.getDeclSpec().getStorageClassSpecLoc());
7373 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
7374 if (CheckMemberSpecialization(NewFD, Previous))
7375 NewFD->setInvalidDecl();
7378 // Perform semantic checking on the function declaration.
7379 if (!isDependentClassScopeExplicitSpecialization) {
7380 if (!NewFD->isInvalidDecl() && NewFD->isMain())
7381 CheckMain(NewFD, D.getDeclSpec());
7383 if (!NewFD->isInvalidDecl() && NewFD->isMSVCRTEntryPoint())
7384 CheckMSVCRTEntryPoint(NewFD);
7386 if (!NewFD->isInvalidDecl())
7387 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
7388 isExplicitSpecialization));
7391 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
7392 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
7393 "previous declaration set still overloaded");
7395 NamedDecl *PrincipalDecl = (FunctionTemplate
7396 ? cast<NamedDecl>(FunctionTemplate)
7399 if (isFriend && D.isRedeclaration()) {
7400 AccessSpecifier Access = AS_public;
7401 if (!NewFD->isInvalidDecl())
7402 Access = NewFD->getPreviousDecl()->getAccess();
7404 NewFD->setAccess(Access);
7405 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
7408 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
7409 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
7410 PrincipalDecl->setNonMemberOperator();
7412 // If we have a function template, check the template parameter
7413 // list. This will check and merge default template arguments.
7414 if (FunctionTemplate) {
7415 FunctionTemplateDecl *PrevTemplate =
7416 FunctionTemplate->getPreviousDecl();
7417 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
7418 PrevTemplate ? PrevTemplate->getTemplateParameters()
7420 D.getDeclSpec().isFriendSpecified()
7421 ? (D.isFunctionDefinition()
7422 ? TPC_FriendFunctionTemplateDefinition
7423 : TPC_FriendFunctionTemplate)
7424 : (D.getCXXScopeSpec().isSet() &&
7425 DC && DC->isRecord() &&
7426 DC->isDependentContext())
7427 ? TPC_ClassTemplateMember
7428 : TPC_FunctionTemplate);
7431 if (NewFD->isInvalidDecl()) {
7432 // Ignore all the rest of this.
7433 } else if (!D.isRedeclaration()) {
7434 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
7436 // Fake up an access specifier if it's supposed to be a class member.
7437 if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
7438 NewFD->setAccess(AS_public);
7440 // Qualified decls generally require a previous declaration.
7441 if (D.getCXXScopeSpec().isSet()) {
7442 // ...with the major exception of templated-scope or
7443 // dependent-scope friend declarations.
7445 // TODO: we currently also suppress this check in dependent
7446 // contexts because (1) the parameter depth will be off when
7447 // matching friend templates and (2) we might actually be
7448 // selecting a friend based on a dependent factor. But there
7449 // are situations where these conditions don't apply and we
7450 // can actually do this check immediately.
7452 (TemplateParamLists.size() ||
7453 D.getCXXScopeSpec().getScopeRep()->isDependent() ||
7454 CurContext->isDependentContext())) {
7457 // The user tried to provide an out-of-line definition for a
7458 // function that is a member of a class or namespace, but there
7459 // was no such member function declared (C++ [class.mfct]p2,
7460 // C++ [namespace.memdef]p2). For example:
7466 // void X::f() { } // ill-formed
7468 // Complain about this problem, and attempt to suggest close
7469 // matches (e.g., those that differ only in cv-qualifiers and
7470 // whether the parameter types are references).
7472 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(
7473 *this, Previous, NewFD, ExtraArgs, false, nullptr)) {
7474 AddToScope = ExtraArgs.AddToScope;
7479 // Unqualified local friend declarations are required to resolve
7481 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
7482 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(
7483 *this, Previous, NewFD, ExtraArgs, true, S)) {
7484 AddToScope = ExtraArgs.AddToScope;
7489 } else if (!D.isFunctionDefinition() &&
7490 isa<CXXMethodDecl>(NewFD) && NewFD->isOutOfLine() &&
7491 !isFriend && !isFunctionTemplateSpecialization &&
7492 !isExplicitSpecialization) {
7493 // An out-of-line member function declaration must also be a
7494 // definition (C++ [class.mfct]p2).
7495 // Note that this is not the case for explicit specializations of
7496 // function templates or member functions of class templates, per
7497 // C++ [temp.expl.spec]p2. We also allow these declarations as an
7498 // extension for compatibility with old SWIG code which likes to
7500 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
7501 << D.getCXXScopeSpec().getRange();
7505 ProcessPragmaWeak(S, NewFD);
7506 checkAttributesAfterMerging(*this, *NewFD);
7508 AddKnownFunctionAttributes(NewFD);
7510 if (NewFD->hasAttr<OverloadableAttr>() &&
7511 !NewFD->getType()->getAs<FunctionProtoType>()) {
7512 Diag(NewFD->getLocation(),
7513 diag::err_attribute_overloadable_no_prototype)
7516 // Turn this into a variadic function with no parameters.
7517 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
7518 FunctionProtoType::ExtProtoInfo EPI(
7519 Context.getDefaultCallingConvention(true, false));
7520 EPI.Variadic = true;
7521 EPI.ExtInfo = FT->getExtInfo();
7523 QualType R = Context.getFunctionType(FT->getReturnType(), None, EPI);
7527 // If there's a #pragma GCC visibility in scope, and this isn't a class
7528 // member, set the visibility of this function.
7529 if (!DC->isRecord() && NewFD->isExternallyVisible())
7530 AddPushedVisibilityAttribute(NewFD);
7532 // If there's a #pragma clang arc_cf_code_audited in scope, consider
7533 // marking the function.
7534 AddCFAuditedAttribute(NewFD);
7536 // If this is a function definition, check if we have to apply optnone due to
7538 if(D.isFunctionDefinition())
7539 AddRangeBasedOptnone(NewFD);
7541 // If this is the first declaration of an extern C variable, update
7542 // the map of such variables.
7543 if (NewFD->isFirstDecl() && !NewFD->isInvalidDecl() &&
7544 isIncompleteDeclExternC(*this, NewFD))
7545 RegisterLocallyScopedExternCDecl(NewFD, S);
7547 // Set this FunctionDecl's range up to the right paren.
7548 NewFD->setRangeEnd(D.getSourceRange().getEnd());
7550 if (D.isRedeclaration() && !Previous.empty()) {
7551 checkDLLAttributeRedeclaration(
7552 *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewFD,
7553 isExplicitSpecialization || isFunctionTemplateSpecialization);
7556 if (getLangOpts().CPlusPlus) {
7557 if (FunctionTemplate) {
7558 if (NewFD->isInvalidDecl())
7559 FunctionTemplate->setInvalidDecl();
7560 return FunctionTemplate;
7564 if (NewFD->hasAttr<OpenCLKernelAttr>()) {
7565 // OpenCL v1.2 s6.8 static is invalid for kernel functions.
7566 if ((getLangOpts().OpenCLVersion >= 120)
7567 && (SC == SC_Static)) {
7568 Diag(D.getIdentifierLoc(), diag::err_static_kernel);
7572 // OpenCL v1.2, s6.9 -- Kernels can only have return type void.
7573 if (!NewFD->getReturnType()->isVoidType()) {
7574 SourceRange RTRange = NewFD->getReturnTypeSourceRange();
7575 Diag(D.getIdentifierLoc(), diag::err_expected_kernel_void_return_type)
7576 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void")
7581 llvm::SmallPtrSet<const Type *, 16> ValidTypes;
7582 for (auto Param : NewFD->params())
7583 checkIsValidOpenCLKernelParameter(*this, D, Param, ValidTypes);
7586 MarkUnusedFileScopedDecl(NewFD);
7588 if (getLangOpts().CUDA)
7589 if (IdentifierInfo *II = NewFD->getIdentifier())
7590 if (!NewFD->isInvalidDecl() &&
7591 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
7592 if (II->isStr("cudaConfigureCall")) {
7593 if (!R->getAs<FunctionType>()->getReturnType()->isScalarType())
7594 Diag(NewFD->getLocation(), diag::err_config_scalar_return);
7596 Context.setcudaConfigureCallDecl(NewFD);
7600 // Here we have an function template explicit specialization at class scope.
7601 // The actually specialization will be postponed to template instatiation
7602 // time via the ClassScopeFunctionSpecializationDecl node.
7603 if (isDependentClassScopeExplicitSpecialization) {
7604 ClassScopeFunctionSpecializationDecl *NewSpec =
7605 ClassScopeFunctionSpecializationDecl::Create(
7606 Context, CurContext, SourceLocation(),
7607 cast<CXXMethodDecl>(NewFD),
7608 HasExplicitTemplateArgs, TemplateArgs);
7609 CurContext->addDecl(NewSpec);
7616 /// \brief Perform semantic checking of a new function declaration.
7618 /// Performs semantic analysis of the new function declaration
7619 /// NewFD. This routine performs all semantic checking that does not
7620 /// require the actual declarator involved in the declaration, and is
7621 /// used both for the declaration of functions as they are parsed
7622 /// (called via ActOnDeclarator) and for the declaration of functions
7623 /// that have been instantiated via C++ template instantiation (called
7624 /// via InstantiateDecl).
7626 /// \param IsExplicitSpecialization whether this new function declaration is
7627 /// an explicit specialization of the previous declaration.
7629 /// This sets NewFD->isInvalidDecl() to true if there was an error.
7631 /// \returns true if the function declaration is a redeclaration.
7632 bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
7633 LookupResult &Previous,
7634 bool IsExplicitSpecialization) {
7635 assert(!NewFD->getReturnType()->isVariablyModifiedType() &&
7636 "Variably modified return types are not handled here");
7638 // Determine whether the type of this function should be merged with
7639 // a previous visible declaration. This never happens for functions in C++,
7640 // and always happens in C if the previous declaration was visible.
7641 bool MergeTypeWithPrevious = !getLangOpts().CPlusPlus &&
7642 !Previous.isShadowed();
7644 // Filter out any non-conflicting previous declarations.
7645 filterNonConflictingPreviousDecls(Context, NewFD, Previous);
7647 bool Redeclaration = false;
7648 NamedDecl *OldDecl = nullptr;
7650 // Merge or overload the declaration with an existing declaration of
7651 // the same name, if appropriate.
7652 if (!Previous.empty()) {
7653 // Determine whether NewFD is an overload of PrevDecl or
7654 // a declaration that requires merging. If it's an overload,
7655 // there's no more work to do here; we'll just add the new
7656 // function to the scope.
7657 if (!AllowOverloadingOfFunction(Previous, Context)) {
7658 NamedDecl *Candidate = Previous.getFoundDecl();
7659 if (shouldLinkPossiblyHiddenDecl(Candidate, NewFD)) {
7660 Redeclaration = true;
7661 OldDecl = Candidate;
7664 switch (CheckOverload(S, NewFD, Previous, OldDecl,
7665 /*NewIsUsingDecl*/ false)) {
7667 Redeclaration = true;
7670 case Ovl_NonFunction:
7671 Redeclaration = true;
7675 Redeclaration = false;
7679 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
7680 // If a function name is overloadable in C, then every function
7681 // with that name must be marked "overloadable".
7682 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
7683 << Redeclaration << NewFD;
7684 NamedDecl *OverloadedDecl = nullptr;
7686 OverloadedDecl = OldDecl;
7687 else if (!Previous.empty())
7688 OverloadedDecl = Previous.getRepresentativeDecl();
7690 Diag(OverloadedDecl->getLocation(),
7691 diag::note_attribute_overloadable_prev_overload);
7692 NewFD->addAttr(OverloadableAttr::CreateImplicit(Context));
7697 // Check for a previous extern "C" declaration with this name.
7698 if (!Redeclaration &&
7699 checkForConflictWithNonVisibleExternC(*this, NewFD, Previous)) {
7700 filterNonConflictingPreviousDecls(Context, NewFD, Previous);
7701 if (!Previous.empty()) {
7702 // This is an extern "C" declaration with the same name as a previous
7703 // declaration, and thus redeclares that entity...
7704 Redeclaration = true;
7705 OldDecl = Previous.getFoundDecl();
7706 MergeTypeWithPrevious = false;
7708 // ... except in the presence of __attribute__((overloadable)).
7709 if (OldDecl->hasAttr<OverloadableAttr>()) {
7710 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
7711 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
7712 << Redeclaration << NewFD;
7713 Diag(Previous.getFoundDecl()->getLocation(),
7714 diag::note_attribute_overloadable_prev_overload);
7715 NewFD->addAttr(OverloadableAttr::CreateImplicit(Context));
7717 if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) {
7718 Redeclaration = false;
7725 // C++11 [dcl.constexpr]p8:
7726 // A constexpr specifier for a non-static member function that is not
7727 // a constructor declares that member function to be const.
7729 // This needs to be delayed until we know whether this is an out-of-line
7730 // definition of a static member function.
7732 // This rule is not present in C++1y, so we produce a backwards
7733 // compatibility warning whenever it happens in C++11.
7734 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
7735 if (!getLangOpts().CPlusPlus1y && MD && MD->isConstexpr() &&
7736 !MD->isStatic() && !isa<CXXConstructorDecl>(MD) &&
7737 (MD->getTypeQualifiers() & Qualifiers::Const) == 0) {
7738 CXXMethodDecl *OldMD = nullptr;
7740 OldMD = dyn_cast<CXXMethodDecl>(OldDecl->getAsFunction());
7741 if (!OldMD || !OldMD->isStatic()) {
7742 const FunctionProtoType *FPT =
7743 MD->getType()->castAs<FunctionProtoType>();
7744 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
7745 EPI.TypeQuals |= Qualifiers::Const;
7746 MD->setType(Context.getFunctionType(FPT->getReturnType(),
7747 FPT->getParamTypes(), EPI));
7749 // Warn that we did this, if we're not performing template instantiation.
7750 // In that case, we'll have warned already when the template was defined.
7751 if (ActiveTemplateInstantiations.empty()) {
7752 SourceLocation AddConstLoc;
7753 if (FunctionTypeLoc FTL = MD->getTypeSourceInfo()->getTypeLoc()
7754 .IgnoreParens().getAs<FunctionTypeLoc>())
7755 AddConstLoc = getLocForEndOfToken(FTL.getRParenLoc());
7757 Diag(MD->getLocation(), diag::warn_cxx1y_compat_constexpr_not_const)
7758 << FixItHint::CreateInsertion(AddConstLoc, " const");
7763 if (Redeclaration) {
7764 // NewFD and OldDecl represent declarations that need to be
7766 if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious)) {
7767 NewFD->setInvalidDecl();
7768 return Redeclaration;
7772 Previous.addDecl(OldDecl);
7774 if (FunctionTemplateDecl *OldTemplateDecl
7775 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
7776 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
7777 FunctionTemplateDecl *NewTemplateDecl
7778 = NewFD->getDescribedFunctionTemplate();
7779 assert(NewTemplateDecl && "Template/non-template mismatch");
7780 if (CXXMethodDecl *Method
7781 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
7782 Method->setAccess(OldTemplateDecl->getAccess());
7783 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
7786 // If this is an explicit specialization of a member that is a function
7787 // template, mark it as a member specialization.
7788 if (IsExplicitSpecialization &&
7789 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
7790 NewTemplateDecl->setMemberSpecialization();
7791 assert(OldTemplateDecl->isMemberSpecialization());
7795 // This needs to happen first so that 'inline' propagates.
7796 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
7798 if (isa<CXXMethodDecl>(NewFD)) {
7799 // A valid redeclaration of a C++ method must be out-of-line,
7800 // but (unfortunately) it's not necessarily a definition
7801 // because of templates, which means that the previous
7802 // declaration is not necessarily from the class definition.
7804 // For just setting the access, that doesn't matter.
7805 CXXMethodDecl *oldMethod = cast<CXXMethodDecl>(OldDecl);
7806 NewFD->setAccess(oldMethod->getAccess());
7808 // Update the key-function state if necessary for this ABI.
7809 if (NewFD->isInlined() &&
7810 !Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline()) {
7811 // setNonKeyFunction needs to work with the original
7812 // declaration from the class definition, and isVirtual() is
7813 // just faster in that case, so map back to that now.
7814 oldMethod = cast<CXXMethodDecl>(oldMethod->getFirstDecl());
7815 if (oldMethod->isVirtual()) {
7816 Context.setNonKeyFunction(oldMethod);
7823 // Semantic checking for this function declaration (in isolation).
7824 if (getLangOpts().CPlusPlus) {
7825 // C++-specific checks.
7826 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
7827 CheckConstructor(Constructor);
7828 } else if (CXXDestructorDecl *Destructor =
7829 dyn_cast<CXXDestructorDecl>(NewFD)) {
7830 CXXRecordDecl *Record = Destructor->getParent();
7831 QualType ClassType = Context.getTypeDeclType(Record);
7833 // FIXME: Shouldn't we be able to perform this check even when the class
7834 // type is dependent? Both gcc and edg can handle that.
7835 if (!ClassType->isDependentType()) {
7836 DeclarationName Name
7837 = Context.DeclarationNames.getCXXDestructorName(
7838 Context.getCanonicalType(ClassType));
7839 if (NewFD->getDeclName() != Name) {
7840 Diag(NewFD->getLocation(), diag::err_destructor_name);
7841 NewFD->setInvalidDecl();
7842 return Redeclaration;
7845 } else if (CXXConversionDecl *Conversion
7846 = dyn_cast<CXXConversionDecl>(NewFD)) {
7847 ActOnConversionDeclarator(Conversion);
7850 // Find any virtual functions that this function overrides.
7851 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
7852 if (!Method->isFunctionTemplateSpecialization() &&
7853 !Method->getDescribedFunctionTemplate() &&
7854 Method->isCanonicalDecl()) {
7855 if (AddOverriddenMethods(Method->getParent(), Method)) {
7856 // If the function was marked as "static", we have a problem.
7857 if (NewFD->getStorageClass() == SC_Static) {
7858 ReportOverrides(*this, diag::err_static_overrides_virtual, Method);
7863 if (Method->isStatic())
7864 checkThisInStaticMemberFunctionType(Method);
7867 // Extra checking for C++ overloaded operators (C++ [over.oper]).
7868 if (NewFD->isOverloadedOperator() &&
7869 CheckOverloadedOperatorDeclaration(NewFD)) {
7870 NewFD->setInvalidDecl();
7871 return Redeclaration;
7874 // Extra checking for C++0x literal operators (C++0x [over.literal]).
7875 if (NewFD->getLiteralIdentifier() &&
7876 CheckLiteralOperatorDeclaration(NewFD)) {
7877 NewFD->setInvalidDecl();
7878 return Redeclaration;
7881 // In C++, check default arguments now that we have merged decls. Unless
7882 // the lexical context is the class, because in this case this is done
7883 // during delayed parsing anyway.
7884 if (!CurContext->isRecord())
7885 CheckCXXDefaultArguments(NewFD);
7887 // If this function declares a builtin function, check the type of this
7888 // declaration against the expected type for the builtin.
7889 if (unsigned BuiltinID = NewFD->getBuiltinID()) {
7890 ASTContext::GetBuiltinTypeError Error;
7891 LookupPredefedObjCSuperType(*this, S, NewFD->getIdentifier());
7892 QualType T = Context.GetBuiltinType(BuiltinID, Error);
7893 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) {
7894 // The type of this function differs from the type of the builtin,
7895 // so forget about the builtin entirely.
7896 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents);
7900 // If this function is declared as being extern "C", then check to see if
7901 // the function returns a UDT (class, struct, or union type) that is not C
7902 // compatible, and if it does, warn the user.
7903 // But, issue any diagnostic on the first declaration only.
7904 if (NewFD->isExternC() && Previous.empty()) {
7905 QualType R = NewFD->getReturnType();
7906 if (R->isIncompleteType() && !R->isVoidType())
7907 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)
7909 else if (!R.isPODType(Context) && !R->isVoidType() &&
7910 !R->isObjCObjectPointerType())
7911 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R;
7914 return Redeclaration;
7917 void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
7918 // C++11 [basic.start.main]p3:
7919 // A program that [...] declares main to be inline, static or
7920 // constexpr is ill-formed.
7921 // C11 6.7.4p4: In a hosted environment, no function specifier(s) shall
7922 // appear in a declaration of main.
7923 // static main is not an error under C99, but we should warn about it.
7924 // We accept _Noreturn main as an extension.
7925 if (FD->getStorageClass() == SC_Static)
7926 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus
7927 ? diag::err_static_main : diag::warn_static_main)
7928 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
7929 if (FD->isInlineSpecified())
7930 Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
7931 << FixItHint::CreateRemoval(DS.getInlineSpecLoc());
7932 if (DS.isNoreturnSpecified()) {
7933 SourceLocation NoreturnLoc = DS.getNoreturnSpecLoc();
7934 SourceRange NoreturnRange(NoreturnLoc, getLocForEndOfToken(NoreturnLoc));
7935 Diag(NoreturnLoc, diag::ext_noreturn_main);
7936 Diag(NoreturnLoc, diag::note_main_remove_noreturn)
7937 << FixItHint::CreateRemoval(NoreturnRange);
7939 if (FD->isConstexpr()) {
7940 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main)
7941 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc());
7942 FD->setConstexpr(false);
7945 if (getLangOpts().OpenCL) {
7946 Diag(FD->getLocation(), diag::err_opencl_no_main)
7947 << FD->hasAttr<OpenCLKernelAttr>();
7948 FD->setInvalidDecl();
7952 QualType T = FD->getType();
7953 assert(T->isFunctionType() && "function decl is not of function type");
7954 const FunctionType* FT = T->castAs<FunctionType>();
7956 if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) {
7957 // In C with GNU extensions we allow main() to have non-integer return
7958 // type, but we should warn about the extension, and we disable the
7959 // implicit-return-zero rule.
7961 // GCC in C mode accepts qualified 'int'.
7962 if (Context.hasSameUnqualifiedType(FT->getReturnType(), Context.IntTy))
7963 FD->setHasImplicitReturnZero(true);
7965 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint);
7966 SourceRange RTRange = FD->getReturnTypeSourceRange();
7967 if (RTRange.isValid())
7968 Diag(RTRange.getBegin(), diag::note_main_change_return_type)
7969 << FixItHint::CreateReplacement(RTRange, "int");
7972 // In C and C++, main magically returns 0 if you fall off the end;
7973 // set the flag which tells us that.
7974 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3.
7976 // All the standards say that main() should return 'int'.
7977 if (Context.hasSameType(FT->getReturnType(), Context.IntTy))
7978 FD->setHasImplicitReturnZero(true);
7980 // Otherwise, this is just a flat-out error.
7981 SourceRange RTRange = FD->getReturnTypeSourceRange();
7982 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint)
7983 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "int")
7985 FD->setInvalidDecl(true);
7989 // Treat protoless main() as nullary.
7990 if (isa<FunctionNoProtoType>(FT)) return;
7992 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
7993 unsigned nparams = FTP->getNumParams();
7994 assert(FD->getNumParams() == nparams);
7996 bool HasExtraParameters = (nparams > 3);
7998 // Darwin passes an undocumented fourth argument of type char**. If
7999 // other platforms start sprouting these, the logic below will start
8001 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
8002 HasExtraParameters = false;
8004 if (HasExtraParameters) {
8005 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
8006 FD->setInvalidDecl(true);
8010 // FIXME: a lot of the following diagnostics would be improved
8011 // if we had some location information about types.
8014 Context.getPointerType(Context.getPointerType(Context.CharTy));
8015 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
8017 for (unsigned i = 0; i < nparams; ++i) {
8018 QualType AT = FTP->getParamType(i);
8020 bool mismatch = true;
8022 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
8024 else if (Expected[i] == CharPP) {
8025 // As an extension, the following forms are okay:
8027 // char const * const *
8030 QualifierCollector qs;
8031 const PointerType* PT;
8032 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
8033 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
8034 Context.hasSameType(QualType(qs.strip(PT->getPointeeType()), 0),
8037 mismatch = !qs.empty();
8042 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
8043 // TODO: suggest replacing given type with expected type
8044 FD->setInvalidDecl(true);
8048 if (nparams == 1 && !FD->isInvalidDecl()) {
8049 Diag(FD->getLocation(), diag::warn_main_one_arg);
8052 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
8053 Diag(FD->getLocation(), diag::err_mainlike_template_decl) << FD;
8054 FD->setInvalidDecl();
8058 void Sema::CheckMSVCRTEntryPoint(FunctionDecl *FD) {
8059 QualType T = FD->getType();
8060 assert(T->isFunctionType() && "function decl is not of function type");
8061 const FunctionType *FT = T->castAs<FunctionType>();
8063 // Set an implicit return of 'zero' if the function can return some integral,
8064 // enumeration, pointer or nullptr type.
8065 if (FT->getReturnType()->isIntegralOrEnumerationType() ||
8066 FT->getReturnType()->isAnyPointerType() ||
8067 FT->getReturnType()->isNullPtrType())
8068 // DllMain is exempt because a return value of zero means it failed.
8069 if (FD->getName() != "DllMain")
8070 FD->setHasImplicitReturnZero(true);
8072 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
8073 Diag(FD->getLocation(), diag::err_mainlike_template_decl) << FD;
8074 FD->setInvalidDecl();
8078 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
8079 // FIXME: Need strict checking. In C89, we need to check for
8080 // any assignment, increment, decrement, function-calls, or
8081 // commas outside of a sizeof. In C99, it's the same list,
8082 // except that the aforementioned are allowed in unevaluated
8083 // expressions. Everything else falls under the
8084 // "may accept other forms of constant expressions" exception.
8085 // (We never end up here for C++, so the constant expression
8086 // rules there don't matter.)
8087 const Expr *Culprit;
8088 if (Init->isConstantInitializer(Context, false, &Culprit))
8090 Diag(Culprit->getExprLoc(), diag::err_init_element_not_constant)
8091 << Culprit->getSourceRange();
8096 // Visits an initialization expression to see if OrigDecl is evaluated in
8097 // its own initialization and throws a warning if it does.
8098 class SelfReferenceChecker
8099 : public EvaluatedExprVisitor<SelfReferenceChecker> {
8104 bool isReferenceType;
8107 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
8109 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
8110 S(S), OrigDecl(OrigDecl) {
8112 isRecordType = false;
8113 isReferenceType = false;
8114 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
8115 isPODType = VD->getType().isPODType(S.Context);
8116 isRecordType = VD->getType()->isRecordType();
8117 isReferenceType = VD->getType()->isReferenceType();
8121 // For most expressions, the cast is directly above the DeclRefExpr.
8122 // For conditional operators, the cast can be outside the conditional
8123 // operator if both expressions are DeclRefExpr's.
8124 void HandleValue(Expr *E) {
8125 if (isReferenceType)
8127 E = E->IgnoreParenImpCasts();
8128 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) {
8129 HandleDeclRefExpr(DRE);
8133 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
8134 HandleValue(CO->getTrueExpr());
8135 HandleValue(CO->getFalseExpr());
8139 if (isa<MemberExpr>(E)) {
8140 Expr *Base = E->IgnoreParenImpCasts();
8141 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
8142 // Check for static member variables and don't warn on them.
8143 if (!isa<FieldDecl>(ME->getMemberDecl()))
8145 Base = ME->getBase()->IgnoreParenImpCasts();
8147 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base))
8148 HandleDeclRefExpr(DRE);
8153 // Reference types are handled here since all uses of references are
8154 // bad, not just r-value uses.
8155 void VisitDeclRefExpr(DeclRefExpr *E) {
8156 if (isReferenceType)
8157 HandleDeclRefExpr(E);
8160 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
8161 if (E->getCastKind() == CK_LValueToRValue ||
8162 (isRecordType && E->getCastKind() == CK_NoOp))
8163 HandleValue(E->getSubExpr());
8165 Inherited::VisitImplicitCastExpr(E);
8168 void VisitMemberExpr(MemberExpr *E) {
8169 // Don't warn on arrays since they can be treated as pointers.
8170 if (E->getType()->canDecayToPointerType()) return;
8172 // Warn when a non-static method call is followed by non-static member
8173 // field accesses, which is followed by a DeclRefExpr.
8174 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl());
8175 bool Warn = (MD && !MD->isStatic());
8176 Expr *Base = E->getBase()->IgnoreParenImpCasts();
8177 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
8178 if (!isa<FieldDecl>(ME->getMemberDecl()))
8180 Base = ME->getBase()->IgnoreParenImpCasts();
8183 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) {
8185 HandleDeclRefExpr(DRE);
8189 // The base of a MemberExpr is not a MemberExpr or a DeclRefExpr.
8190 // Visit that expression.
8194 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
8195 if (E->getNumArgs() > 0)
8196 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getArg(0)))
8197 HandleDeclRefExpr(DRE);
8199 Inherited::VisitCXXOperatorCallExpr(E);
8202 void VisitUnaryOperator(UnaryOperator *E) {
8203 // For POD record types, addresses of its own members are well-defined.
8204 if (E->getOpcode() == UO_AddrOf && isRecordType &&
8205 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) {
8207 HandleValue(E->getSubExpr());
8210 Inherited::VisitUnaryOperator(E);
8213 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; }
8215 void HandleDeclRefExpr(DeclRefExpr *DRE) {
8216 Decl* ReferenceDecl = DRE->getDecl();
8217 if (OrigDecl != ReferenceDecl) return;
8219 if (isReferenceType) {
8220 diag = diag::warn_uninit_self_reference_in_reference_init;
8221 } else if (cast<VarDecl>(OrigDecl)->isStaticLocal()) {
8222 diag = diag::warn_static_self_reference_in_init;
8224 diag = diag::warn_uninit_self_reference_in_init;
8227 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
8229 << DRE->getNameInfo().getName()
8230 << OrigDecl->getLocation()
8231 << DRE->getSourceRange());
8235 /// CheckSelfReference - Warns if OrigDecl is used in expression E.
8236 static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E,
8238 // Parameters arguments are occassionially constructed with itself,
8239 // for instance, in recursive functions. Skip them.
8240 if (isa<ParmVarDecl>(OrigDecl))
8243 E = E->IgnoreParens();
8245 // Skip checking T a = a where T is not a record or reference type.
8246 // Doing so is a way to silence uninitialized warnings.
8247 if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType())
8248 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
8249 if (ICE->getCastKind() == CK_LValueToRValue)
8250 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()))
8251 if (DRE->getDecl() == OrigDecl)
8254 SelfReferenceChecker(S, OrigDecl).Visit(E);
8258 /// AddInitializerToDecl - Adds the initializer Init to the
8259 /// declaration dcl. If DirectInit is true, this is C++ direct
8260 /// initialization rather than copy initialization.
8261 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
8262 bool DirectInit, bool TypeMayContainAuto) {
8263 // If there is no declaration, there was an error parsing it. Just ignore
8265 if (!RealDecl || RealDecl->isInvalidDecl())
8268 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
8269 // With declarators parsed the way they are, the parser cannot
8270 // distinguish between a normal initializer and a pure-specifier.
8271 // Thus this grotesque test.
8273 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
8274 Context.getCanonicalType(IL->getType()) == Context.IntTy)
8275 CheckPureMethod(Method, Init->getSourceRange());
8277 Diag(Method->getLocation(), diag::err_member_function_initialization)
8278 << Method->getDeclName() << Init->getSourceRange();
8279 Method->setInvalidDecl();
8284 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
8286 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
8287 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
8288 RealDecl->setInvalidDecl();
8291 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init);
8293 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
8294 if (TypeMayContainAuto && VDecl->getType()->isUndeducedType()) {
8295 Expr *DeduceInit = Init;
8296 // Initializer could be a C++ direct-initializer. Deduction only works if it
8297 // contains exactly one expression.
8298 if (CXXDirectInit) {
8299 if (CXXDirectInit->getNumExprs() == 0) {
8300 // It isn't possible to write this directly, but it is possible to
8301 // end up in this situation with "auto x(some_pack...);"
8302 Diag(CXXDirectInit->getLocStart(),
8303 VDecl->isInitCapture() ? diag::err_init_capture_no_expression
8304 : diag::err_auto_var_init_no_expression)
8305 << VDecl->getDeclName() << VDecl->getType()
8306 << VDecl->getSourceRange();
8307 RealDecl->setInvalidDecl();
8309 } else if (CXXDirectInit->getNumExprs() > 1) {
8310 Diag(CXXDirectInit->getExpr(1)->getLocStart(),
8311 VDecl->isInitCapture()
8312 ? diag::err_init_capture_multiple_expressions
8313 : diag::err_auto_var_init_multiple_expressions)
8314 << VDecl->getDeclName() << VDecl->getType()
8315 << VDecl->getSourceRange();
8316 RealDecl->setInvalidDecl();
8319 DeduceInit = CXXDirectInit->getExpr(0);
8320 if (isa<InitListExpr>(DeduceInit))
8321 Diag(CXXDirectInit->getLocStart(),
8322 diag::err_auto_var_init_paren_braces)
8323 << VDecl->getDeclName() << VDecl->getType()
8324 << VDecl->getSourceRange();
8328 // Expressions default to 'id' when we're in a debugger.
8329 bool DefaultedToAuto = false;
8330 if (getLangOpts().DebuggerCastResultToId &&
8331 Init->getType() == Context.UnknownAnyTy) {
8332 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
8333 if (Result.isInvalid()) {
8334 VDecl->setInvalidDecl();
8337 Init = Result.get();
8338 DefaultedToAuto = true;
8341 QualType DeducedType;
8342 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) ==
8344 DiagnoseAutoDeductionFailure(VDecl, DeduceInit);
8345 if (DeducedType.isNull()) {
8346 RealDecl->setInvalidDecl();
8349 VDecl->setType(DeducedType);
8350 assert(VDecl->isLinkageValid());
8352 // In ARC, infer lifetime.
8353 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
8354 VDecl->setInvalidDecl();
8356 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using
8357 // 'id' instead of a specific object type prevents most of our usual checks.
8358 // We only want to warn outside of template instantiations, though:
8359 // inside a template, the 'id' could have come from a parameter.
8360 if (ActiveTemplateInstantiations.empty() && !DefaultedToAuto &&
8361 DeducedType->isObjCIdType()) {
8362 SourceLocation Loc =
8363 VDecl->getTypeSourceInfo()->getTypeLoc().getBeginLoc();
8364 Diag(Loc, diag::warn_auto_var_is_id)
8365 << VDecl->getDeclName() << DeduceInit->getSourceRange();
8368 // If this is a redeclaration, check that the type we just deduced matches
8369 // the previously declared type.
8370 if (VarDecl *Old = VDecl->getPreviousDecl()) {
8371 // We never need to merge the type, because we cannot form an incomplete
8372 // array of auto, nor deduce such a type.
8373 MergeVarDeclTypes(VDecl, Old, /*MergeTypeWithPrevious*/false);
8376 // Check the deduced type is valid for a variable declaration.
8377 CheckVariableDeclarationType(VDecl);
8378 if (VDecl->isInvalidDecl())
8382 // dllimport cannot be used on variable definitions.
8383 if (VDecl->hasAttr<DLLImportAttr>() && !VDecl->isStaticDataMember()) {
8384 Diag(VDecl->getLocation(), diag::err_attribute_dllimport_data_definition);
8385 VDecl->setInvalidDecl();
8389 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) {
8390 // C99 6.7.8p5. C++ has no such restriction, but that is a defect.
8391 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
8392 VDecl->setInvalidDecl();
8396 if (!VDecl->getType()->isDependentType()) {
8397 // A definition must end up with a complete type, which means it must be
8398 // complete with the restriction that an array type might be completed by
8399 // the initializer; note that later code assumes this restriction.
8400 QualType BaseDeclType = VDecl->getType();
8401 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
8402 BaseDeclType = Array->getElementType();
8403 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
8404 diag::err_typecheck_decl_incomplete_type)) {
8405 RealDecl->setInvalidDecl();
8409 // The variable can not have an abstract class type.
8410 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
8411 diag::err_abstract_type_in_decl,
8412 AbstractVariableType))
8413 VDecl->setInvalidDecl();
8417 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
8418 Diag(VDecl->getLocation(), diag::err_redefinition)
8419 << VDecl->getDeclName();
8420 Diag(Def->getLocation(), diag::note_previous_definition);
8421 VDecl->setInvalidDecl();
8425 const VarDecl *PrevInit = nullptr;
8426 if (getLangOpts().CPlusPlus) {
8427 // C++ [class.static.data]p4
8428 // If a static data member is of const integral or const
8429 // enumeration type, its declaration in the class definition can
8430 // specify a constant-initializer which shall be an integral
8431 // constant expression (5.19). In that case, the member can appear
8432 // in integral constant expressions. The member shall still be
8433 // defined in a namespace scope if it is used in the program and the
8434 // namespace scope definition shall not contain an initializer.
8436 // We already performed a redefinition check above, but for static
8437 // data members we also need to check whether there was an in-class
8438 // declaration with an initializer.
8439 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
8440 Diag(Init->getExprLoc(), diag::err_static_data_member_reinitialization)
8441 << VDecl->getDeclName();
8442 Diag(PrevInit->getInit()->getExprLoc(), diag::note_previous_initializer) << 0;
8446 if (VDecl->hasLocalStorage())
8447 getCurFunction()->setHasBranchProtectedScope();
8449 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
8450 VDecl->setInvalidDecl();
8455 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
8456 // a kernel function cannot be initialized."
8457 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) {
8458 Diag(VDecl->getLocation(), diag::err_local_cant_init);
8459 VDecl->setInvalidDecl();
8463 // Get the decls type and save a reference for later, since
8464 // CheckInitializerTypes may change it.
8465 QualType DclT = VDecl->getType(), SavT = DclT;
8467 // Expressions default to 'id' when we're in a debugger
8468 // and we are assigning it to a variable of Objective-C pointer type.
8469 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCObjectPointerType() &&
8470 Init->getType() == Context.UnknownAnyTy) {
8471 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
8472 if (Result.isInvalid()) {
8473 VDecl->setInvalidDecl();
8476 Init = Result.get();
8479 // Perform the initialization.
8480 if (!VDecl->isInvalidDecl()) {
8481 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
8482 InitializationKind Kind
8484 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(),
8485 Init->getLocStart(),
8487 : InitializationKind::CreateDirectList(
8488 VDecl->getLocation())
8489 : InitializationKind::CreateCopy(VDecl->getLocation(),
8490 Init->getLocStart());
8492 MultiExprArg Args = Init;
8494 Args = MultiExprArg(CXXDirectInit->getExprs(),
8495 CXXDirectInit->getNumExprs());
8497 InitializationSequence InitSeq(*this, Entity, Kind, Args);
8498 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Args, &DclT);
8499 if (Result.isInvalid()) {
8500 VDecl->setInvalidDecl();
8504 Init = Result.getAs<Expr>();
8507 // Check for self-references within variable initializers.
8508 // Variables declared within a function/method body (except for references)
8509 // are handled by a dataflow analysis.
8510 if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
8511 VDecl->getType()->isReferenceType()) {
8512 CheckSelfReference(*this, RealDecl, Init, DirectInit);
8515 // If the type changed, it means we had an incomplete type that was
8516 // completed by the initializer. For example:
8517 // int ary[] = { 1, 3, 5 };
8518 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType.
8519 if (!VDecl->isInvalidDecl() && (DclT != SavT))
8520 VDecl->setType(DclT);
8522 if (!VDecl->isInvalidDecl()) {
8523 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
8525 if (VDecl->hasAttr<BlocksAttr>())
8526 checkRetainCycles(VDecl, Init);
8528 // It is safe to assign a weak reference into a strong variable.
8529 // Although this code can still have problems:
8530 // id x = self.weakProp;
8531 // id y = self.weakProp;
8532 // we do not warn to warn spuriously when 'x' and 'y' are on separate
8533 // paths through the function. This should be revisited if
8534 // -Wrepeated-use-of-weak is made flow-sensitive.
8535 if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong &&
8536 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
8537 Init->getLocStart()))
8538 getCurFunction()->markSafeWeakUse(Init);
8541 // The initialization is usually a full-expression.
8543 // FIXME: If this is a braced initialization of an aggregate, it is not
8544 // an expression, and each individual field initializer is a separate
8545 // full-expression. For instance, in:
8547 // struct Temp { ~Temp(); };
8548 // struct S { S(Temp); };
8549 // struct T { S a, b; } t = { Temp(), Temp() }
8551 // we should destroy the first Temp before constructing the second.
8552 ExprResult Result = ActOnFinishFullExpr(Init, VDecl->getLocation(),
8554 VDecl->isConstexpr());
8555 if (Result.isInvalid()) {
8556 VDecl->setInvalidDecl();
8559 Init = Result.get();
8561 // Attach the initializer to the decl.
8562 VDecl->setInit(Init);
8564 if (VDecl->isLocalVarDecl()) {
8565 // C99 6.7.8p4: All the expressions in an initializer for an object that has
8566 // static storage duration shall be constant expressions or string literals.
8567 // C++ does not have this restriction.
8568 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) {
8569 const Expr *Culprit;
8570 if (VDecl->getStorageClass() == SC_Static)
8571 CheckForConstantInitializer(Init, DclT);
8572 // C89 is stricter than C99 for non-static aggregate types.
8573 // C89 6.5.7p3: All the expressions [...] in an initializer list
8574 // for an object that has aggregate or union type shall be
8575 // constant expressions.
8576 else if (!getLangOpts().C99 && VDecl->getType()->isAggregateType() &&
8577 isa<InitListExpr>(Init) &&
8578 !Init->isConstantInitializer(Context, false, &Culprit))
8579 Diag(Culprit->getExprLoc(),
8580 diag::ext_aggregate_init_not_constant)
8581 << Culprit->getSourceRange();
8583 } else if (VDecl->isStaticDataMember() &&
8584 VDecl->getLexicalDeclContext()->isRecord()) {
8585 // This is an in-class initialization for a static data member, e.g.,
8588 // static const int value = 17;
8591 // C++ [class.mem]p4:
8592 // A member-declarator can contain a constant-initializer only
8593 // if it declares a static member (9.4) of const integral or
8594 // const enumeration type, see 9.4.2.
8596 // C++11 [class.static.data]p3:
8597 // If a non-volatile const static data member is of integral or
8598 // enumeration type, its declaration in the class definition can
8599 // specify a brace-or-equal-initializer in which every initalizer-clause
8600 // that is an assignment-expression is a constant expression. A static
8601 // data member of literal type can be declared in the class definition
8602 // with the constexpr specifier; if so, its declaration shall specify a
8603 // brace-or-equal-initializer in which every initializer-clause that is
8604 // an assignment-expression is a constant expression.
8606 // Do nothing on dependent types.
8607 if (DclT->isDependentType()) {
8609 // Allow any 'static constexpr' members, whether or not they are of literal
8610 // type. We separately check that every constexpr variable is of literal
8612 } else if (VDecl->isConstexpr()) {
8614 // Require constness.
8615 } else if (!DclT.isConstQualified()) {
8616 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
8617 << Init->getSourceRange();
8618 VDecl->setInvalidDecl();
8620 // We allow integer constant expressions in all cases.
8621 } else if (DclT->isIntegralOrEnumerationType()) {
8622 // Check whether the expression is a constant expression.
8624 if (getLangOpts().CPlusPlus11 && DclT.isVolatileQualified())
8625 // In C++11, a non-constexpr const static data member with an
8626 // in-class initializer cannot be volatile.
8627 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
8628 else if (Init->isValueDependent())
8629 ; // Nothing to check.
8630 else if (Init->isIntegerConstantExpr(Context, &Loc))
8631 ; // Ok, it's an ICE!
8632 else if (Init->isEvaluatable(Context)) {
8633 // If we can constant fold the initializer through heroics, accept it,
8634 // but report this as a use of an extension for -pedantic.
8635 Diag(Loc, diag::ext_in_class_initializer_non_constant)
8636 << Init->getSourceRange();
8638 // Otherwise, this is some crazy unknown case. Report the issue at the
8639 // location provided by the isIntegerConstantExpr failed check.
8640 Diag(Loc, diag::err_in_class_initializer_non_constant)
8641 << Init->getSourceRange();
8642 VDecl->setInvalidDecl();
8645 // We allow foldable floating-point constants as an extension.
8646 } else if (DclT->isFloatingType()) { // also permits complex, which is ok
8647 // In C++98, this is a GNU extension. In C++11, it is not, but we support
8648 // it anyway and provide a fixit to add the 'constexpr'.
8649 if (getLangOpts().CPlusPlus11) {
8650 Diag(VDecl->getLocation(),
8651 diag::ext_in_class_initializer_float_type_cxx11)
8652 << DclT << Init->getSourceRange();
8653 Diag(VDecl->getLocStart(),
8654 diag::note_in_class_initializer_float_type_cxx11)
8655 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
8657 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
8658 << DclT << Init->getSourceRange();
8660 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) {
8661 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
8662 << Init->getSourceRange();
8663 VDecl->setInvalidDecl();
8667 // Suggest adding 'constexpr' in C++11 for literal types.
8668 } else if (getLangOpts().CPlusPlus11 && DclT->isLiteralType(Context)) {
8669 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
8670 << DclT << Init->getSourceRange()
8671 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
8672 VDecl->setConstexpr(true);
8675 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
8676 << DclT << Init->getSourceRange();
8677 VDecl->setInvalidDecl();
8679 } else if (VDecl->isFileVarDecl()) {
8680 if (VDecl->getStorageClass() == SC_Extern &&
8681 (!getLangOpts().CPlusPlus ||
8682 !(Context.getBaseElementType(VDecl->getType()).isConstQualified() ||
8683 VDecl->isExternC())) &&
8684 !isTemplateInstantiation(VDecl->getTemplateSpecializationKind()))
8685 Diag(VDecl->getLocation(), diag::warn_extern_init);
8687 // C99 6.7.8p4. All file scoped initializers need to be constant.
8688 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl())
8689 CheckForConstantInitializer(Init, DclT);
8692 // We will represent direct-initialization similarly to copy-initialization:
8693 // int x(1); -as-> int x = 1;
8694 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
8696 // Clients that want to distinguish between the two forms, can check for
8697 // direct initializer using VarDecl::getInitStyle().
8698 // A major benefit is that clients that don't particularly care about which
8699 // exactly form was it (like the CodeGen) can handle both cases without
8700 // special case code.
8703 // The form of initialization (using parentheses or '=') is generally
8704 // insignificant, but does matter when the entity being initialized has a
8706 if (CXXDirectInit) {
8707 assert(DirectInit && "Call-style initializer must be direct init.");
8708 VDecl->setInitStyle(VarDecl::CallInit);
8709 } else if (DirectInit) {
8710 // This must be list-initialization. No other way is direct-initialization.
8711 VDecl->setInitStyle(VarDecl::ListInit);
8714 CheckCompleteVariableDeclaration(VDecl);
8717 /// ActOnInitializerError - Given that there was an error parsing an
8718 /// initializer for the given declaration, try to return to some form
8720 void Sema::ActOnInitializerError(Decl *D) {
8721 // Our main concern here is re-establishing invariants like "a
8722 // variable's type is either dependent or complete".
8723 if (!D || D->isInvalidDecl()) return;
8725 VarDecl *VD = dyn_cast<VarDecl>(D);
8728 // Auto types are meaningless if we can't make sense of the initializer.
8729 if (ParsingInitForAutoVars.count(D)) {
8730 D->setInvalidDecl();
8734 QualType Ty = VD->getType();
8735 if (Ty->isDependentType()) return;
8737 // Require a complete type.
8738 if (RequireCompleteType(VD->getLocation(),
8739 Context.getBaseElementType(Ty),
8740 diag::err_typecheck_decl_incomplete_type)) {
8741 VD->setInvalidDecl();
8745 // Require a non-abstract type.
8746 if (RequireNonAbstractType(VD->getLocation(), Ty,
8747 diag::err_abstract_type_in_decl,
8748 AbstractVariableType)) {
8749 VD->setInvalidDecl();
8753 // Don't bother complaining about constructors or destructors,
8757 void Sema::ActOnUninitializedDecl(Decl *RealDecl,
8758 bool TypeMayContainAuto) {
8759 // If there is no declaration, there was an error parsing it. Just ignore it.
8763 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
8764 QualType Type = Var->getType();
8766 // C++11 [dcl.spec.auto]p3
8767 if (TypeMayContainAuto && Type->getContainedAutoType()) {
8768 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
8769 << Var->getDeclName() << Type;
8770 Var->setInvalidDecl();
8774 // C++11 [class.static.data]p3: A static data member can be declared with
8775 // the constexpr specifier; if so, its declaration shall specify
8776 // a brace-or-equal-initializer.
8777 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to
8778 // the definition of a variable [...] or the declaration of a static data
8780 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) {
8781 if (Var->isStaticDataMember())
8782 Diag(Var->getLocation(),
8783 diag::err_constexpr_static_mem_var_requires_init)
8784 << Var->getDeclName();
8786 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl);
8787 Var->setInvalidDecl();
8791 // OpenCL v1.1 s6.5.3: variables declared in the constant address space must
8793 if (!Var->isInvalidDecl() &&
8794 Var->getType().getAddressSpace() == LangAS::opencl_constant &&
8795 Var->getStorageClass() != SC_Extern && !Var->getInit()) {
8796 Diag(Var->getLocation(), diag::err_opencl_constant_no_init);
8797 Var->setInvalidDecl();
8801 switch (Var->isThisDeclarationADefinition()) {
8802 case VarDecl::Definition:
8803 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
8806 // We have an out-of-line definition of a static data member
8807 // that has an in-class initializer, so we type-check this like
8812 case VarDecl::DeclarationOnly:
8813 // It's only a declaration.
8815 // Block scope. C99 6.7p7: If an identifier for an object is
8816 // declared with no linkage (C99 6.2.2p6), the type for the
8817 // object shall be complete.
8818 if (!Type->isDependentType() && Var->isLocalVarDecl() &&
8819 !Var->hasLinkage() && !Var->isInvalidDecl() &&
8820 RequireCompleteType(Var->getLocation(), Type,
8821 diag::err_typecheck_decl_incomplete_type))
8822 Var->setInvalidDecl();
8824 // Make sure that the type is not abstract.
8825 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
8826 RequireNonAbstractType(Var->getLocation(), Type,
8827 diag::err_abstract_type_in_decl,
8828 AbstractVariableType))
8829 Var->setInvalidDecl();
8830 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
8831 Var->getStorageClass() == SC_PrivateExtern) {
8832 Diag(Var->getLocation(), diag::warn_private_extern);
8833 Diag(Var->getLocation(), diag::note_private_extern);
8838 case VarDecl::TentativeDefinition:
8839 // File scope. C99 6.9.2p2: A declaration of an identifier for an
8840 // object that has file scope without an initializer, and without a
8841 // storage-class specifier or with the storage-class specifier "static",
8842 // constitutes a tentative definition. Note: A tentative definition with
8843 // external linkage is valid (C99 6.2.2p5).
8844 if (!Var->isInvalidDecl()) {
8845 if (const IncompleteArrayType *ArrayT
8846 = Context.getAsIncompleteArrayType(Type)) {
8847 if (RequireCompleteType(Var->getLocation(),
8848 ArrayT->getElementType(),
8849 diag::err_illegal_decl_array_incomplete_type))
8850 Var->setInvalidDecl();
8851 } else if (Var->getStorageClass() == SC_Static) {
8852 // C99 6.9.2p3: If the declaration of an identifier for an object is
8853 // a tentative definition and has internal linkage (C99 6.2.2p3), the
8854 // declared type shall not be an incomplete type.
8855 // NOTE: code such as the following
8857 // struct s { int a; };
8858 // is accepted by gcc. Hence here we issue a warning instead of
8859 // an error and we do not invalidate the static declaration.
8860 // NOTE: to avoid multiple warnings, only check the first declaration.
8861 if (Var->isFirstDecl())
8862 RequireCompleteType(Var->getLocation(), Type,
8863 diag::ext_typecheck_decl_incomplete_type);
8867 // Record the tentative definition; we're done.
8868 if (!Var->isInvalidDecl())
8869 TentativeDefinitions.push_back(Var);
8873 // Provide a specific diagnostic for uninitialized variable
8874 // definitions with incomplete array type.
8875 if (Type->isIncompleteArrayType()) {
8876 Diag(Var->getLocation(),
8877 diag::err_typecheck_incomplete_array_needs_initializer);
8878 Var->setInvalidDecl();
8882 // Provide a specific diagnostic for uninitialized variable
8883 // definitions with reference type.
8884 if (Type->isReferenceType()) {
8885 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
8886 << Var->getDeclName()
8887 << SourceRange(Var->getLocation(), Var->getLocation());
8888 Var->setInvalidDecl();
8892 // Do not attempt to type-check the default initializer for a
8893 // variable with dependent type.
8894 if (Type->isDependentType())
8897 if (Var->isInvalidDecl())
8900 if (!Var->hasAttr<AliasAttr>()) {
8901 if (RequireCompleteType(Var->getLocation(),
8902 Context.getBaseElementType(Type),
8903 diag::err_typecheck_decl_incomplete_type)) {
8904 Var->setInvalidDecl();
8909 // The variable can not have an abstract class type.
8910 if (RequireNonAbstractType(Var->getLocation(), Type,
8911 diag::err_abstract_type_in_decl,
8912 AbstractVariableType)) {
8913 Var->setInvalidDecl();
8917 // Check for jumps past the implicit initializer. C++0x
8918 // clarifies that this applies to a "variable with automatic
8919 // storage duration", not a "local variable".
8920 // C++11 [stmt.dcl]p3
8921 // A program that jumps from a point where a variable with automatic
8922 // storage duration is not in scope to a point where it is in scope is
8923 // ill-formed unless the variable has scalar type, class type with a
8924 // trivial default constructor and a trivial destructor, a cv-qualified
8925 // version of one of these types, or an array of one of the preceding
8926 // types and is declared without an initializer.
8927 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) {
8928 if (const RecordType *Record
8929 = Context.getBaseElementType(Type)->getAs<RecordType>()) {
8930 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
8931 // Mark the function for further checking even if the looser rules of
8932 // C++11 do not require such checks, so that we can diagnose
8933 // incompatibilities with C++98.
8934 if (!CXXRecord->isPOD())
8935 getCurFunction()->setHasBranchProtectedScope();
8939 // C++03 [dcl.init]p9:
8940 // If no initializer is specified for an object, and the
8941 // object is of (possibly cv-qualified) non-POD class type (or
8942 // array thereof), the object shall be default-initialized; if
8943 // the object is of const-qualified type, the underlying class
8944 // type shall have a user-declared default
8945 // constructor. Otherwise, if no initializer is specified for
8946 // a non- static object, the object and its subobjects, if
8947 // any, have an indeterminate initial value); if the object
8948 // or any of its subobjects are of const-qualified type, the
8949 // program is ill-formed.
8950 // C++0x [dcl.init]p11:
8951 // If no initializer is specified for an object, the object is
8952 // default-initialized; [...].
8953 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
8954 InitializationKind Kind
8955 = InitializationKind::CreateDefault(Var->getLocation());
8957 InitializationSequence InitSeq(*this, Entity, Kind, None);
8958 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, None);
8959 if (Init.isInvalid())
8960 Var->setInvalidDecl();
8961 else if (Init.get()) {
8962 Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
8963 // This is important for template substitution.
8964 Var->setInitStyle(VarDecl::CallInit);
8967 CheckCompleteVariableDeclaration(Var);
8971 void Sema::ActOnCXXForRangeDecl(Decl *D) {
8972 VarDecl *VD = dyn_cast<VarDecl>(D);
8974 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
8975 D->setInvalidDecl();
8979 VD->setCXXForRangeDecl(true);
8981 // for-range-declaration cannot be given a storage class specifier.
8983 switch (VD->getStorageClass()) {
8992 case SC_PrivateExtern:
9001 case SC_OpenCLWorkGroupLocal:
9002 llvm_unreachable("Unexpected storage class");
9004 if (VD->isConstexpr())
9007 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
9008 << VD->getDeclName() << Error;
9009 D->setInvalidDecl();
9014 Sema::ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
9015 IdentifierInfo *Ident,
9016 ParsedAttributes &Attrs,
9017 SourceLocation AttrEnd) {
9018 // C++1y [stmt.iter]p1:
9019 // A range-based for statement of the form
9020 // for ( for-range-identifier : for-range-initializer ) statement
9022 // for ( auto&& for-range-identifier : for-range-initializer ) statement
9023 DeclSpec DS(Attrs.getPool().getFactory());
9025 const char *PrevSpec;
9027 DS.SetTypeSpecType(DeclSpec::TST_auto, IdentLoc, PrevSpec, DiagID,
9028 getPrintingPolicy());
9030 Declarator D(DS, Declarator::ForContext);
9031 D.SetIdentifier(Ident, IdentLoc);
9032 D.takeAttributes(Attrs, AttrEnd);
9034 ParsedAttributes EmptyAttrs(Attrs.getPool().getFactory());
9035 D.AddTypeInfo(DeclaratorChunk::getReference(0, IdentLoc, /*lvalue*/false),
9036 EmptyAttrs, IdentLoc);
9037 Decl *Var = ActOnDeclarator(S, D);
9038 cast<VarDecl>(Var)->setCXXForRangeDecl(true);
9039 FinalizeDeclaration(Var);
9040 return ActOnDeclStmt(FinalizeDeclaratorGroup(S, DS, Var), IdentLoc,
9041 AttrEnd.isValid() ? AttrEnd : IdentLoc);
9044 void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
9045 if (var->isInvalidDecl()) return;
9047 // In ARC, don't allow jumps past the implicit initialization of a
9048 // local retaining variable.
9049 if (getLangOpts().ObjCAutoRefCount &&
9050 var->hasLocalStorage()) {
9051 switch (var->getType().getObjCLifetime()) {
9052 case Qualifiers::OCL_None:
9053 case Qualifiers::OCL_ExplicitNone:
9054 case Qualifiers::OCL_Autoreleasing:
9057 case Qualifiers::OCL_Weak:
9058 case Qualifiers::OCL_Strong:
9059 getCurFunction()->setHasBranchProtectedScope();
9064 // Warn about externally-visible variables being defined without a
9065 // prior declaration. We only want to do this for global
9066 // declarations, but we also specifically need to avoid doing it for
9067 // class members because the linkage of an anonymous class can
9068 // change if it's later given a typedef name.
9069 if (var->isThisDeclarationADefinition() &&
9070 var->getDeclContext()->getRedeclContext()->isFileContext() &&
9071 var->isExternallyVisible() && var->hasLinkage() &&
9072 !getDiagnostics().isIgnored(diag::warn_missing_variable_declarations,
9073 var->getLocation())) {
9074 // Find a previous declaration that's not a definition.
9075 VarDecl *prev = var->getPreviousDecl();
9076 while (prev && prev->isThisDeclarationADefinition())
9077 prev = prev->getPreviousDecl();
9080 Diag(var->getLocation(), diag::warn_missing_variable_declarations) << var;
9083 if (var->getTLSKind() == VarDecl::TLS_Static) {
9084 const Expr *Culprit;
9085 if (var->getType().isDestructedType()) {
9086 // GNU C++98 edits for __thread, [basic.start.term]p3:
9087 // The type of an object with thread storage duration shall not
9088 // have a non-trivial destructor.
9089 Diag(var->getLocation(), diag::err_thread_nontrivial_dtor);
9090 if (getLangOpts().CPlusPlus11)
9091 Diag(var->getLocation(), diag::note_use_thread_local);
9092 } else if (getLangOpts().CPlusPlus && var->hasInit() &&
9093 !var->getInit()->isConstantInitializer(
9094 Context, var->getType()->isReferenceType(), &Culprit)) {
9095 // GNU C++98 edits for __thread, [basic.start.init]p4:
9096 // An object of thread storage duration shall not require dynamic
9098 // FIXME: Need strict checking here.
9099 Diag(Culprit->getExprLoc(), diag::err_thread_dynamic_init)
9100 << Culprit->getSourceRange();
9101 if (getLangOpts().CPlusPlus11)
9102 Diag(var->getLocation(), diag::note_use_thread_local);
9107 if (var->isThisDeclarationADefinition() &&
9108 ActiveTemplateInstantiations.empty()) {
9109 PragmaStack<StringLiteral *> *Stack = nullptr;
9110 int SectionFlags = PSF_Implicit | PSF_Read;
9111 if (var->getType().isConstQualified())
9112 Stack = &ConstSegStack;
9113 else if (!var->getInit()) {
9114 Stack = &BSSSegStack;
9115 SectionFlags |= PSF_Write;
9117 Stack = &DataSegStack;
9118 SectionFlags |= PSF_Write;
9120 if (!var->hasAttr<SectionAttr>() && Stack->CurrentValue)
9122 SectionAttr::CreateImplicit(Context, SectionAttr::Declspec_allocate,
9123 Stack->CurrentValue->getString(),
9124 Stack->CurrentPragmaLocation));
9125 if (const SectionAttr *SA = var->getAttr<SectionAttr>())
9126 if (UnifySection(SA->getName(), SectionFlags, var))
9127 var->dropAttr<SectionAttr>();
9129 // Apply the init_seg attribute if this has an initializer. If the
9130 // initializer turns out to not be dynamic, we'll end up ignoring this
9132 if (CurInitSeg && var->getInit())
9133 var->addAttr(InitSegAttr::CreateImplicit(Context, CurInitSeg->getString(),
9137 // All the following checks are C++ only.
9138 if (!getLangOpts().CPlusPlus) return;
9140 QualType type = var->getType();
9141 if (type->isDependentType()) return;
9143 // __block variables might require us to capture a copy-initializer.
9144 if (var->hasAttr<BlocksAttr>()) {
9145 // It's currently invalid to ever have a __block variable with an
9146 // array type; should we diagnose that here?
9148 // Regardless, we don't want to ignore array nesting when
9149 // constructing this copy.
9150 if (type->isStructureOrClassType()) {
9151 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
9152 SourceLocation poi = var->getLocation();
9153 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi);
9155 = PerformMoveOrCopyInitialization(
9156 InitializedEntity::InitializeBlock(poi, type, false),
9157 var, var->getType(), varRef, /*AllowNRVO=*/true);
9158 if (!result.isInvalid()) {
9159 result = MaybeCreateExprWithCleanups(result);
9160 Expr *init = result.getAs<Expr>();
9161 Context.setBlockVarCopyInits(var, init);
9166 Expr *Init = var->getInit();
9167 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal();
9168 QualType baseType = Context.getBaseElementType(type);
9170 if (!var->getDeclContext()->isDependentContext() &&
9171 Init && !Init->isValueDependent()) {
9172 if (IsGlobal && !var->isConstexpr() &&
9173 !getDiagnostics().isIgnored(diag::warn_global_constructor,
9174 var->getLocation())) {
9175 // Warn about globals which don't have a constant initializer. Don't
9176 // warn about globals with a non-trivial destructor because we already
9177 // warned about them.
9178 CXXRecordDecl *RD = baseType->getAsCXXRecordDecl();
9179 if (!(RD && !RD->hasTrivialDestructor()) &&
9180 !Init->isConstantInitializer(Context, baseType->isReferenceType()))
9181 Diag(var->getLocation(), diag::warn_global_constructor)
9182 << Init->getSourceRange();
9185 if (var->isConstexpr()) {
9186 SmallVector<PartialDiagnosticAt, 8> Notes;
9187 if (!var->evaluateValue(Notes) || !var->isInitICE()) {
9188 SourceLocation DiagLoc = var->getLocation();
9189 // If the note doesn't add any useful information other than a source
9190 // location, fold it into the primary diagnostic.
9191 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
9192 diag::note_invalid_subexpr_in_const_expr) {
9193 DiagLoc = Notes[0].first;
9196 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init)
9197 << var << Init->getSourceRange();
9198 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
9199 Diag(Notes[I].first, Notes[I].second);
9201 } else if (var->isUsableInConstantExpressions(Context)) {
9202 // Check whether the initializer of a const variable of integral or
9203 // enumeration type is an ICE now, since we can't tell whether it was
9204 // initialized by a constant expression if we check later.
9205 var->checkInitIsICE();
9209 // Require the destructor.
9210 if (const RecordType *recordType = baseType->getAs<RecordType>())
9211 FinalizeVarWithDestructor(var, recordType);
9214 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
9215 /// any semantic actions necessary after any initializer has been attached.
9217 Sema::FinalizeDeclaration(Decl *ThisDecl) {
9218 // Note that we are no longer parsing the initializer for this declaration.
9219 ParsingInitForAutoVars.erase(ThisDecl);
9221 VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl);
9225 checkAttributesAfterMerging(*this, *VD);
9227 // Static locals inherit dll attributes from their function.
9228 if (VD->isStaticLocal()) {
9229 if (FunctionDecl *FD =
9230 dyn_cast<FunctionDecl>(VD->getParentFunctionOrMethod())) {
9231 if (Attr *A = getDLLAttr(FD)) {
9232 auto *NewAttr = cast<InheritableAttr>(A->clone(getASTContext()));
9233 NewAttr->setInherited(true);
9234 VD->addAttr(NewAttr);
9239 // Imported static data members cannot be defined out-of-line.
9240 if (const DLLImportAttr *IA = VD->getAttr<DLLImportAttr>()) {
9241 if (VD->isStaticDataMember() && VD->isOutOfLine() &&
9242 VD->isThisDeclarationADefinition()) {
9243 // We allow definitions of dllimport class template static data members
9245 CXXRecordDecl *Context =
9246 cast<CXXRecordDecl>(VD->getFirstDecl()->getDeclContext());
9247 bool IsClassTemplateMember =
9248 isa<ClassTemplatePartialSpecializationDecl>(Context) ||
9249 Context->getDescribedClassTemplate();
9251 Diag(VD->getLocation(),
9252 IsClassTemplateMember
9253 ? diag::warn_attribute_dllimport_static_field_definition
9254 : diag::err_attribute_dllimport_static_field_definition);
9255 Diag(IA->getLocation(), diag::note_attribute);
9256 if (!IsClassTemplateMember)
9257 VD->setInvalidDecl();
9261 if (UsedAttr *Attr = VD->getAttr<UsedAttr>()) {
9262 if (!Attr->isInherited() && !VD->isThisDeclarationADefinition()) {
9263 Diag(Attr->getLocation(), diag::warn_attribute_ignored) << Attr;
9264 VD->dropAttr<UsedAttr>();
9268 if (!VD->isInvalidDecl() &&
9269 VD->isThisDeclarationADefinition() == VarDecl::TentativeDefinition) {
9270 if (const VarDecl *Def = VD->getDefinition()) {
9271 if (Def->hasAttr<AliasAttr>()) {
9272 Diag(VD->getLocation(), diag::err_tentative_after_alias)
9273 << VD->getDeclName();
9274 Diag(Def->getLocation(), diag::note_previous_definition);
9275 VD->setInvalidDecl();
9280 const DeclContext *DC = VD->getDeclContext();
9281 // If there's a #pragma GCC visibility in scope, and this isn't a class
9282 // member, set the visibility of this variable.
9283 if (DC->getRedeclContext()->isFileContext() && VD->isExternallyVisible())
9284 AddPushedVisibilityAttribute(VD);
9286 // FIXME: Warn on unused templates.
9287 if (VD->isFileVarDecl() && !VD->getDescribedVarTemplate() &&
9288 !isa<VarTemplatePartialSpecializationDecl>(VD))
9289 MarkUnusedFileScopedDecl(VD);
9291 // Now we have parsed the initializer and can update the table of magic
9293 if (!VD->hasAttr<TypeTagForDatatypeAttr>() ||
9294 !VD->getType()->isIntegralOrEnumerationType())
9297 for (const auto *I : ThisDecl->specific_attrs<TypeTagForDatatypeAttr>()) {
9298 const Expr *MagicValueExpr = VD->getInit();
9299 if (!MagicValueExpr) {
9302 llvm::APSInt MagicValueInt;
9303 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) {
9304 Diag(I->getRange().getBegin(),
9305 diag::err_type_tag_for_datatype_not_ice)
9306 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
9309 if (MagicValueInt.getActiveBits() > 64) {
9310 Diag(I->getRange().getBegin(),
9311 diag::err_type_tag_for_datatype_too_large)
9312 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
9315 uint64_t MagicValue = MagicValueInt.getZExtValue();
9316 RegisterTypeTagForDatatype(I->getArgumentKind(),
9318 I->getMatchingCType(),
9319 I->getLayoutCompatible(),
9320 I->getMustBeNull());
9324 Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
9325 ArrayRef<Decl *> Group) {
9326 SmallVector<Decl*, 8> Decls;
9328 if (DS.isTypeSpecOwned())
9329 Decls.push_back(DS.getRepAsDecl());
9331 DeclaratorDecl *FirstDeclaratorInGroup = nullptr;
9332 for (unsigned i = 0, e = Group.size(); i != e; ++i)
9333 if (Decl *D = Group[i]) {
9334 if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D))
9335 if (!FirstDeclaratorInGroup)
9336 FirstDeclaratorInGroup = DD;
9340 if (DeclSpec::isDeclRep(DS.getTypeSpecType())) {
9341 if (TagDecl *Tag = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl())) {
9342 HandleTagNumbering(*this, Tag, S);
9343 if (!Tag->hasNameForLinkage() && !Tag->hasDeclaratorForAnonDecl())
9344 Tag->setDeclaratorForAnonDecl(FirstDeclaratorInGroup);
9348 return BuildDeclaratorGroup(Decls, DS.containsPlaceholderType());
9351 /// BuildDeclaratorGroup - convert a list of declarations into a declaration
9352 /// group, performing any necessary semantic checking.
9353 Sema::DeclGroupPtrTy
9354 Sema::BuildDeclaratorGroup(MutableArrayRef<Decl *> Group,
9355 bool TypeMayContainAuto) {
9356 // C++0x [dcl.spec.auto]p7:
9357 // If the type deduced for the template parameter U is not the same in each
9358 // deduction, the program is ill-formed.
9359 // FIXME: When initializer-list support is added, a distinction is needed
9360 // between the deduced type U and the deduced type which 'auto' stands for.
9361 // auto a = 0, b = { 1, 2, 3 };
9362 // is legal because the deduced type U is 'int' in both cases.
9363 if (TypeMayContainAuto && Group.size() > 1) {
9365 CanQualType DeducedCanon;
9366 VarDecl *DeducedDecl = nullptr;
9367 for (unsigned i = 0, e = Group.size(); i != e; ++i) {
9368 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
9369 AutoType *AT = D->getType()->getContainedAutoType();
9370 // Don't reissue diagnostics when instantiating a template.
9371 if (AT && D->isInvalidDecl())
9373 QualType U = AT ? AT->getDeducedType() : QualType();
9375 CanQualType UCanon = Context.getCanonicalType(U);
9376 if (Deduced.isNull()) {
9378 DeducedCanon = UCanon;
9380 } else if (DeducedCanon != UCanon) {
9381 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
9382 diag::err_auto_different_deductions)
9383 << (AT->isDecltypeAuto() ? 1 : 0)
9384 << Deduced << DeducedDecl->getDeclName()
9385 << U << D->getDeclName()
9386 << DeducedDecl->getInit()->getSourceRange()
9387 << D->getInit()->getSourceRange();
9388 D->setInvalidDecl();
9396 ActOnDocumentableDecls(Group);
9398 return DeclGroupPtrTy::make(
9399 DeclGroupRef::Create(Context, Group.data(), Group.size()));
9402 void Sema::ActOnDocumentableDecl(Decl *D) {
9403 ActOnDocumentableDecls(D);
9406 void Sema::ActOnDocumentableDecls(ArrayRef<Decl *> Group) {
9407 // Don't parse the comment if Doxygen diagnostics are ignored.
9408 if (Group.empty() || !Group[0])
9411 if (Diags.isIgnored(diag::warn_doc_param_not_found, Group[0]->getLocation()))
9414 if (Group.size() >= 2) {
9415 // This is a decl group. Normally it will contain only declarations
9416 // produced from declarator list. But in case we have any definitions or
9417 // additional declaration references:
9418 // 'typedef struct S {} S;'
9419 // 'typedef struct S *S;'
9421 // FinalizeDeclaratorGroup adds these as separate declarations.
9422 Decl *MaybeTagDecl = Group[0];
9423 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) {
9424 Group = Group.slice(1);
9428 // See if there are any new comments that are not attached to a decl.
9429 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments();
9430 if (!Comments.empty() &&
9431 !Comments.back()->isAttached()) {
9432 // There is at least one comment that not attached to a decl.
9433 // Maybe it should be attached to one of these decls?
9435 // Note that this way we pick up not only comments that precede the
9436 // declaration, but also comments that *follow* the declaration -- thanks to
9437 // the lookahead in the lexer: we've consumed the semicolon and looked
9438 // ahead through comments.
9439 for (unsigned i = 0, e = Group.size(); i != e; ++i)
9440 Context.getCommentForDecl(Group[i], &PP);
9444 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
9445 /// to introduce parameters into function prototype scope.
9446 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
9447 const DeclSpec &DS = D.getDeclSpec();
9449 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
9451 // C++03 [dcl.stc]p2 also permits 'auto'.
9452 VarDecl::StorageClass StorageClass = SC_None;
9453 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
9454 StorageClass = SC_Register;
9455 } else if (getLangOpts().CPlusPlus &&
9456 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
9457 StorageClass = SC_Auto;
9458 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
9459 Diag(DS.getStorageClassSpecLoc(),
9460 diag::err_invalid_storage_class_in_func_decl);
9461 D.getMutableDeclSpec().ClearStorageClassSpecs();
9464 if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
9465 Diag(DS.getThreadStorageClassSpecLoc(), diag::err_invalid_thread)
9466 << DeclSpec::getSpecifierName(TSCS);
9467 if (DS.isConstexprSpecified())
9468 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr)
9471 DiagnoseFunctionSpecifiers(DS);
9473 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
9474 QualType parmDeclType = TInfo->getType();
9476 if (getLangOpts().CPlusPlus) {
9477 // Check that there are no default arguments inside the type of this
9479 CheckExtraCXXDefaultArguments(D);
9481 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
9482 if (D.getCXXScopeSpec().isSet()) {
9483 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
9484 << D.getCXXScopeSpec().getRange();
9485 D.getCXXScopeSpec().clear();
9489 // Ensure we have a valid name
9490 IdentifierInfo *II = nullptr;
9492 II = D.getIdentifier();
9494 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
9495 << GetNameForDeclarator(D).getName();
9496 D.setInvalidType(true);
9500 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
9502 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
9505 if (R.isSingleResult()) {
9506 NamedDecl *PrevDecl = R.getFoundDecl();
9507 if (PrevDecl->isTemplateParameter()) {
9508 // Maybe we will complain about the shadowed template parameter.
9509 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
9510 // Just pretend that we didn't see the previous declaration.
9512 } else if (S->isDeclScope(PrevDecl)) {
9513 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
9514 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
9516 // Recover by removing the name
9518 D.SetIdentifier(nullptr, D.getIdentifierLoc());
9519 D.setInvalidType(true);
9524 // Temporarily put parameter variables in the translation unit, not
9525 // the enclosing context. This prevents them from accidentally
9526 // looking like class members in C++.
9527 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
9529 D.getIdentifierLoc(), II,
9530 parmDeclType, TInfo,
9533 if (D.isInvalidType())
9534 New->setInvalidDecl();
9536 assert(S->isFunctionPrototypeScope());
9537 assert(S->getFunctionPrototypeDepth() >= 1);
9538 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
9539 S->getNextFunctionPrototypeIndex());
9541 // Add the parameter declaration into this scope.
9544 IdResolver.AddDecl(New);
9546 ProcessDeclAttributes(S, New, D);
9548 if (D.getDeclSpec().isModulePrivateSpecified())
9549 Diag(New->getLocation(), diag::err_module_private_local)
9550 << 1 << New->getDeclName()
9551 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
9552 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
9554 if (New->hasAttr<BlocksAttr>()) {
9555 Diag(New->getLocation(), diag::err_block_on_nonlocal);
9560 /// \brief Synthesizes a variable for a parameter arising from a
9562 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
9565 /* FIXME: setting StartLoc == Loc.
9566 Would it be worth to modify callers so as to provide proper source
9567 location for the unnamed parameters, embedding the parameter's type? */
9568 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, nullptr,
9569 T, Context.getTrivialTypeSourceInfo(T, Loc),
9571 Param->setImplicit();
9575 void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
9576 ParmVarDecl * const *ParamEnd) {
9577 // Don't diagnose unused-parameter errors in template instantiations; we
9578 // will already have done so in the template itself.
9579 if (!ActiveTemplateInstantiations.empty())
9582 for (; Param != ParamEnd; ++Param) {
9583 if (!(*Param)->isReferenced() && (*Param)->getDeclName() &&
9584 !(*Param)->hasAttr<UnusedAttr>()) {
9585 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
9586 << (*Param)->getDeclName();
9591 void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param,
9592 ParmVarDecl * const *ParamEnd,
9595 if (LangOpts.NumLargeByValueCopy == 0) // No check.
9598 // Warn if the return value is pass-by-value and larger than the specified
9600 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) {
9601 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
9602 if (Size > LangOpts.NumLargeByValueCopy)
9603 Diag(D->getLocation(), diag::warn_return_value_size)
9604 << D->getDeclName() << Size;
9607 // Warn if any parameter is pass-by-value and larger than the specified
9609 for (; Param != ParamEnd; ++Param) {
9610 QualType T = (*Param)->getType();
9611 if (T->isDependentType() || !T.isPODType(Context))
9613 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
9614 if (Size > LangOpts.NumLargeByValueCopy)
9615 Diag((*Param)->getLocation(), diag::warn_parameter_size)
9616 << (*Param)->getDeclName() << Size;
9620 ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
9621 SourceLocation NameLoc, IdentifierInfo *Name,
9622 QualType T, TypeSourceInfo *TSInfo,
9623 VarDecl::StorageClass StorageClass) {
9624 // In ARC, infer a lifetime qualifier for appropriate parameter types.
9625 if (getLangOpts().ObjCAutoRefCount &&
9626 T.getObjCLifetime() == Qualifiers::OCL_None &&
9627 T->isObjCLifetimeType()) {
9629 Qualifiers::ObjCLifetime lifetime;
9631 // Special cases for arrays:
9632 // - if it's const, use __unsafe_unretained
9633 // - otherwise, it's an error
9634 if (T->isArrayType()) {
9635 if (!T.isConstQualified()) {
9636 DelayedDiagnostics.add(
9637 sema::DelayedDiagnostic::makeForbiddenType(
9638 NameLoc, diag::err_arc_array_param_no_ownership, T, false));
9640 lifetime = Qualifiers::OCL_ExplicitNone;
9642 lifetime = T->getObjCARCImplicitLifetime();
9644 T = Context.getLifetimeQualifiedType(T, lifetime);
9647 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
9648 Context.getAdjustedParameterType(T),
9650 StorageClass, nullptr);
9652 // Parameters can not be abstract class types.
9653 // For record types, this is done by the AbstractClassUsageDiagnoser once
9654 // the class has been completely parsed.
9655 if (!CurContext->isRecord() &&
9656 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
9658 New->setInvalidDecl();
9660 // Parameter declarators cannot be interface types. All ObjC objects are
9661 // passed by reference.
9662 if (T->isObjCObjectType()) {
9663 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd();
9665 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
9666 << FixItHint::CreateInsertion(TypeEndLoc, "*");
9667 T = Context.getObjCObjectPointerType(T);
9671 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
9672 // duration shall not be qualified by an address-space qualifier."
9673 // Since all parameters have automatic store duration, they can not have
9674 // an address space.
9675 if (T.getAddressSpace() != 0) {
9676 // OpenCL allows function arguments declared to be an array of a type
9677 // to be qualified with an address space.
9678 if (!(getLangOpts().OpenCL && T->isArrayType())) {
9679 Diag(NameLoc, diag::err_arg_with_address_space);
9680 New->setInvalidDecl();
9687 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
9688 SourceLocation LocAfterDecls) {
9689 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
9691 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
9692 // for a K&R function.
9693 if (!FTI.hasPrototype) {
9694 for (int i = FTI.NumParams; i != 0; /* decrement in loop */) {
9696 if (FTI.Params[i].Param == nullptr) {
9697 SmallString<256> Code;
9698 llvm::raw_svector_ostream(Code)
9699 << " int " << FTI.Params[i].Ident->getName() << ";\n";
9700 Diag(FTI.Params[i].IdentLoc, diag::ext_param_not_declared)
9701 << FTI.Params[i].Ident
9702 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
9704 // Implicitly declare the argument as type 'int' for lack of a better
9706 AttributeFactory attrs;
9708 const char* PrevSpec; // unused
9709 unsigned DiagID; // unused
9710 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.Params[i].IdentLoc, PrevSpec,
9711 DiagID, Context.getPrintingPolicy());
9712 // Use the identifier location for the type source range.
9713 DS.SetRangeStart(FTI.Params[i].IdentLoc);
9714 DS.SetRangeEnd(FTI.Params[i].IdentLoc);
9715 Declarator ParamD(DS, Declarator::KNRTypeListContext);
9716 ParamD.SetIdentifier(FTI.Params[i].Ident, FTI.Params[i].IdentLoc);
9717 FTI.Params[i].Param = ActOnParamDeclarator(S, ParamD);
9723 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) {
9724 assert(getCurFunctionDecl() == nullptr && "Function parsing confused");
9725 assert(D.isFunctionDeclarator() && "Not a function declarator!");
9726 Scope *ParentScope = FnBodyScope->getParent();
9728 D.setFunctionDefinitionKind(FDK_Definition);
9729 Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg());
9730 return ActOnStartOfFunctionDef(FnBodyScope, DP);
9733 void Sema::ActOnFinishInlineMethodDef(CXXMethodDecl *D) {
9734 Consumer.HandleInlineMethodDefinition(D);
9737 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD,
9738 const FunctionDecl*& PossibleZeroParamPrototype) {
9739 // Don't warn about invalid declarations.
9740 if (FD->isInvalidDecl())
9743 // Or declarations that aren't global.
9744 if (!FD->isGlobal())
9747 // Don't warn about C++ member functions.
9748 if (isa<CXXMethodDecl>(FD))
9751 // Don't warn about 'main'.
9755 // Don't warn about inline functions.
9756 if (FD->isInlined())
9759 // Don't warn about function templates.
9760 if (FD->getDescribedFunctionTemplate())
9763 // Don't warn about function template specializations.
9764 if (FD->isFunctionTemplateSpecialization())
9767 // Don't warn for OpenCL kernels.
9768 if (FD->hasAttr<OpenCLKernelAttr>())
9771 bool MissingPrototype = true;
9772 for (const FunctionDecl *Prev = FD->getPreviousDecl();
9773 Prev; Prev = Prev->getPreviousDecl()) {
9774 // Ignore any declarations that occur in function or method
9775 // scope, because they aren't visible from the header.
9776 if (Prev->getLexicalDeclContext()->isFunctionOrMethod())
9779 MissingPrototype = !Prev->getType()->isFunctionProtoType();
9780 if (FD->getNumParams() == 0)
9781 PossibleZeroParamPrototype = Prev;
9785 return MissingPrototype;
9789 Sema::CheckForFunctionRedefinition(FunctionDecl *FD,
9790 const FunctionDecl *EffectiveDefinition) {
9791 // Don't complain if we're in GNU89 mode and the previous definition
9792 // was an extern inline function.
9793 const FunctionDecl *Definition = EffectiveDefinition;
9795 if (!FD->isDefined(Definition))
9798 if (canRedefineFunction(Definition, getLangOpts()))
9801 if (getLangOpts().GNUMode && Definition->isInlineSpecified() &&
9802 Definition->getStorageClass() == SC_Extern)
9803 Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
9804 << FD->getDeclName() << getLangOpts().CPlusPlus;
9806 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
9808 Diag(Definition->getLocation(), diag::note_previous_definition);
9809 FD->setInvalidDecl();
9813 static void RebuildLambdaScopeInfo(CXXMethodDecl *CallOperator,
9815 CXXRecordDecl *const LambdaClass = CallOperator->getParent();
9817 LambdaScopeInfo *LSI = S.PushLambdaScope();
9818 LSI->CallOperator = CallOperator;
9819 LSI->Lambda = LambdaClass;
9820 LSI->ReturnType = CallOperator->getReturnType();
9821 const LambdaCaptureDefault LCD = LambdaClass->getLambdaCaptureDefault();
9823 if (LCD == LCD_None)
9824 LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_None;
9825 else if (LCD == LCD_ByCopy)
9826 LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_LambdaByval;
9827 else if (LCD == LCD_ByRef)
9828 LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_LambdaByref;
9829 DeclarationNameInfo DNI = CallOperator->getNameInfo();
9831 LSI->IntroducerRange = DNI.getCXXOperatorNameRange();
9832 LSI->Mutable = !CallOperator->isConst();
9834 // Add the captures to the LSI so they can be noted as already
9835 // captured within tryCaptureVar.
9836 for (const auto &C : LambdaClass->captures()) {
9837 if (C.capturesVariable()) {
9838 VarDecl *VD = C.getCapturedVar();
9839 if (VD->isInitCapture())
9840 S.CurrentInstantiationScope->InstantiatedLocal(VD, VD);
9841 QualType CaptureType = VD->getType();
9842 const bool ByRef = C.getCaptureKind() == LCK_ByRef;
9843 LSI->addCapture(VD, /*IsBlock*/false, ByRef,
9844 /*RefersToEnclosingLocal*/true, C.getLocation(),
9845 /*EllipsisLoc*/C.isPackExpansion()
9846 ? C.getEllipsisLoc() : SourceLocation(),
9847 CaptureType, /*Expr*/ nullptr);
9849 } else if (C.capturesThis()) {
9850 LSI->addThisCapture(/*Nested*/ false, C.getLocation(),
9851 S.getCurrentThisType(), /*Expr*/ nullptr);
9856 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
9857 // Clear the last template instantiation error context.
9858 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
9862 FunctionDecl *FD = nullptr;
9864 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
9865 FD = FunTmpl->getTemplatedDecl();
9867 FD = cast<FunctionDecl>(D);
9868 // If we are instantiating a generic lambda call operator, push
9869 // a LambdaScopeInfo onto the function stack. But use the information
9870 // that's already been calculated (ActOnLambdaExpr) to prime the current
9872 // When the template operator is being specialized, the LambdaScopeInfo,
9873 // has to be properly restored so that tryCaptureVariable doesn't try
9874 // and capture any new variables. In addition when calculating potential
9875 // captures during transformation of nested lambdas, it is necessary to
9876 // have the LSI properly restored.
9877 if (isGenericLambdaCallOperatorSpecialization(FD)) {
9878 assert(ActiveTemplateInstantiations.size() &&
9879 "There should be an active template instantiation on the stack "
9880 "when instantiating a generic lambda!");
9881 RebuildLambdaScopeInfo(cast<CXXMethodDecl>(D), *this);
9884 // Enter a new function scope
9885 PushFunctionScope();
9887 // See if this is a redefinition.
9888 if (!FD->isLateTemplateParsed())
9889 CheckForFunctionRedefinition(FD);
9891 // Builtin functions cannot be defined.
9892 if (unsigned BuiltinID = FD->getBuiltinID()) {
9893 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
9894 !Context.BuiltinInfo.isPredefinedRuntimeFunction(BuiltinID)) {
9895 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
9896 FD->setInvalidDecl();
9900 // The return type of a function definition must be complete
9901 // (C99 6.9.1p3, C++ [dcl.fct]p6).
9902 QualType ResultType = FD->getReturnType();
9903 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
9904 !FD->isInvalidDecl() &&
9905 RequireCompleteType(FD->getLocation(), ResultType,
9906 diag::err_func_def_incomplete_result))
9907 FD->setInvalidDecl();
9909 // GNU warning -Wmissing-prototypes:
9910 // Warn if a global function is defined without a previous
9911 // prototype declaration. This warning is issued even if the
9912 // definition itself provides a prototype. The aim is to detect
9913 // global functions that fail to be declared in header files.
9914 const FunctionDecl *PossibleZeroParamPrototype = nullptr;
9915 if (ShouldWarnAboutMissingPrototype(FD, PossibleZeroParamPrototype)) {
9916 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
9918 if (PossibleZeroParamPrototype) {
9919 // We found a declaration that is not a prototype,
9920 // but that could be a zero-parameter prototype
9921 if (TypeSourceInfo *TI =
9922 PossibleZeroParamPrototype->getTypeSourceInfo()) {
9923 TypeLoc TL = TI->getTypeLoc();
9924 if (FunctionNoProtoTypeLoc FTL = TL.getAs<FunctionNoProtoTypeLoc>())
9925 Diag(PossibleZeroParamPrototype->getLocation(),
9926 diag::note_declaration_not_a_prototype)
9927 << PossibleZeroParamPrototype
9928 << FixItHint::CreateInsertion(FTL.getRParenLoc(), "void");
9934 PushDeclContext(FnBodyScope, FD);
9936 // Check the validity of our function parameters
9937 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(),
9938 /*CheckParameterNames=*/true);
9940 // Introduce our parameters into the function scope
9941 for (auto Param : FD->params()) {
9942 Param->setOwningFunction(FD);
9944 // If this has an identifier, add it to the scope stack.
9945 if (Param->getIdentifier() && FnBodyScope) {
9946 CheckShadow(FnBodyScope, Param);
9948 PushOnScopeChains(Param, FnBodyScope);
9952 // If we had any tags defined in the function prototype,
9953 // introduce them into the function scope.
9955 for (ArrayRef<NamedDecl *>::iterator
9956 I = FD->getDeclsInPrototypeScope().begin(),
9957 E = FD->getDeclsInPrototypeScope().end();
9961 // Some of these decls (like enums) may have been pinned to the translation unit
9962 // for lack of a real context earlier. If so, remove from the translation unit
9963 // and reattach to the current context.
9964 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) {
9965 // Is the decl actually in the context?
9966 for (const auto *DI : Context.getTranslationUnitDecl()->decls()) {
9968 Context.getTranslationUnitDecl()->removeDecl(D);
9972 // Either way, reassign the lexical decl context to our FunctionDecl.
9973 D->setLexicalDeclContext(CurContext);
9976 // If the decl has a non-null name, make accessible in the current scope.
9977 if (!D->getName().empty())
9978 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false);
9980 // Similarly, dive into enums and fish their constants out, making them
9981 // accessible in this scope.
9982 if (auto *ED = dyn_cast<EnumDecl>(D)) {
9983 for (auto *EI : ED->enumerators())
9984 PushOnScopeChains(EI, FnBodyScope, /*AddToContext=*/false);
9989 // Ensure that the function's exception specification is instantiated.
9990 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>())
9991 ResolveExceptionSpec(D->getLocation(), FPT);
9993 // dllimport cannot be applied to non-inline function definitions.
9994 if (FD->hasAttr<DLLImportAttr>() && !FD->isInlined() &&
9995 !FD->isTemplateInstantiation()) {
9996 assert(!FD->hasAttr<DLLExportAttr>());
9997 Diag(FD->getLocation(), diag::err_attribute_dllimport_function_definition);
9998 FD->setInvalidDecl();
10001 // We want to attach documentation to original Decl (which might be
10002 // a function template).
10003 ActOnDocumentableDecl(D);
10004 if (getCurLexicalContext()->isObjCContainer() &&
10005 getCurLexicalContext()->getDeclKind() != Decl::ObjCCategoryImpl &&
10006 getCurLexicalContext()->getDeclKind() != Decl::ObjCImplementation)
10007 Diag(FD->getLocation(), diag::warn_function_def_in_objc_container);
10012 /// \brief Given the set of return statements within a function body,
10013 /// compute the variables that are subject to the named return value
10016 /// Each of the variables that is subject to the named return value
10017 /// optimization will be marked as NRVO variables in the AST, and any
10018 /// return statement that has a marked NRVO variable as its NRVO candidate can
10019 /// use the named return value optimization.
10021 /// This function applies a very simplistic algorithm for NRVO: if every return
10022 /// statement in the scope of a variable has the same NRVO candidate, that
10023 /// candidate is an NRVO variable.
10024 void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
10025 ReturnStmt **Returns = Scope->Returns.data();
10027 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
10028 if (const VarDecl *NRVOCandidate = Returns[I]->getNRVOCandidate()) {
10029 if (!NRVOCandidate->isNRVOVariable())
10030 Returns[I]->setNRVOCandidate(nullptr);
10035 bool Sema::canDelayFunctionBody(const Declarator &D) {
10036 // We can't delay parsing the body of a constexpr function template (yet).
10037 if (D.getDeclSpec().isConstexprSpecified())
10040 // We can't delay parsing the body of a function template with a deduced
10041 // return type (yet).
10042 if (D.getDeclSpec().containsPlaceholderType()) {
10043 // If the placeholder introduces a non-deduced trailing return type,
10044 // we can still delay parsing it.
10045 if (D.getNumTypeObjects()) {
10046 const auto &Outer = D.getTypeObject(D.getNumTypeObjects() - 1);
10047 if (Outer.Kind == DeclaratorChunk::Function &&
10048 Outer.Fun.hasTrailingReturnType()) {
10049 QualType Ty = GetTypeFromParser(Outer.Fun.getTrailingReturnType());
10050 return Ty.isNull() || !Ty->isUndeducedType();
10059 bool Sema::canSkipFunctionBody(Decl *D) {
10060 // We cannot skip the body of a function (or function template) which is
10061 // constexpr, since we may need to evaluate its body in order to parse the
10062 // rest of the file.
10063 // We cannot skip the body of a function with an undeduced return type,
10064 // because any callers of that function need to know the type.
10065 if (const FunctionDecl *FD = D->getAsFunction())
10066 if (FD->isConstexpr() || FD->getReturnType()->isUndeducedType())
10068 return Consumer.shouldSkipFunctionBody(D);
10071 Decl *Sema::ActOnSkippedFunctionBody(Decl *Decl) {
10072 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Decl))
10073 FD->setHasSkippedBody();
10074 else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(Decl))
10075 MD->setHasSkippedBody();
10076 return ActOnFinishFunctionBody(Decl, nullptr);
10079 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
10080 return ActOnFinishFunctionBody(D, BodyArg, false);
10083 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
10084 bool IsInstantiation) {
10085 FunctionDecl *FD = dcl ? dcl->getAsFunction() : nullptr;
10087 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
10088 sema::AnalysisBasedWarnings::Policy *ActivePolicy = nullptr;
10093 if (getLangOpts().CPlusPlus1y && !FD->isInvalidDecl() && Body &&
10094 !FD->isDependentContext() && FD->getReturnType()->isUndeducedType()) {
10095 // If the function has a deduced result type but contains no 'return'
10096 // statements, the result type as written must be exactly 'auto', and
10097 // the deduced result type is 'void'.
10098 if (!FD->getReturnType()->getAs<AutoType>()) {
10099 Diag(dcl->getLocation(), diag::err_auto_fn_no_return_but_not_auto)
10100 << FD->getReturnType();
10101 FD->setInvalidDecl();
10103 // Substitute 'void' for the 'auto' in the type.
10104 TypeLoc ResultType = FD->getTypeSourceInfo()->getTypeLoc().
10105 IgnoreParens().castAs<FunctionProtoTypeLoc>().getReturnLoc();
10106 Context.adjustDeducedFunctionResultType(
10107 FD, SubstAutoType(ResultType.getType(), Context.VoidTy));
10111 // The only way to be included in UndefinedButUsed is if there is an
10112 // ODR use before the definition. Avoid the expensive map lookup if this
10113 // is the first declaration.
10114 if (!FD->isFirstDecl() && FD->getPreviousDecl()->isUsed()) {
10115 if (!FD->isExternallyVisible())
10116 UndefinedButUsed.erase(FD);
10117 else if (FD->isInlined() &&
10118 (LangOpts.CPlusPlus || !LangOpts.GNUInline) &&
10119 (!FD->getPreviousDecl()->hasAttr<GNUInlineAttr>()))
10120 UndefinedButUsed.erase(FD);
10123 // If the function implicitly returns zero (like 'main') or is naked,
10124 // don't complain about missing return statements.
10125 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>())
10126 WP.disableCheckFallThrough();
10128 // MSVC permits the use of pure specifier (=0) on function definition,
10129 // defined at class scope, warn about this non-standard construct.
10130 if (getLangOpts().MicrosoftExt && FD->isPure() && FD->isCanonicalDecl())
10131 Diag(FD->getLocation(), diag::ext_pure_function_definition);
10133 if (!FD->isInvalidDecl()) {
10134 // Don't diagnose unused parameters of defaulted or deleted functions.
10136 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
10137 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(),
10138 FD->getReturnType(), FD);
10140 // If this is a constructor, we need a vtable.
10141 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
10142 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
10144 // Try to apply the named return value optimization. We have to check
10145 // if we can do this here because lambdas keep return statements around
10146 // to deduce an implicit return type.
10147 if (getLangOpts().CPlusPlus && FD->getReturnType()->isRecordType() &&
10148 !FD->isDependentContext())
10149 computeNRVO(Body, getCurFunction());
10152 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) &&
10153 "Function parsing confused");
10154 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
10155 assert(MD == getCurMethodDecl() && "Method parsing confused");
10157 if (!MD->isInvalidDecl()) {
10158 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
10159 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(),
10160 MD->getReturnType(), MD);
10163 computeNRVO(Body, getCurFunction());
10165 if (getCurFunction()->ObjCShouldCallSuper) {
10166 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call)
10167 << MD->getSelector().getAsString();
10168 getCurFunction()->ObjCShouldCallSuper = false;
10170 if (getCurFunction()->ObjCWarnForNoDesignatedInitChain) {
10171 const ObjCMethodDecl *InitMethod = nullptr;
10172 bool isDesignated =
10173 MD->isDesignatedInitializerForTheInterface(&InitMethod);
10174 assert(isDesignated && InitMethod);
10175 (void)isDesignated;
10177 auto superIsNSObject = [&](const ObjCMethodDecl *MD) {
10178 auto IFace = MD->getClassInterface();
10181 auto SuperD = IFace->getSuperClass();
10184 return SuperD->getIdentifier() ==
10185 NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
10187 // Don't issue this warning for unavailable inits or direct subclasses
10189 if (!MD->isUnavailable() && !superIsNSObject(MD)) {
10190 Diag(MD->getLocation(),
10191 diag::warn_objc_designated_init_missing_super_call);
10192 Diag(InitMethod->getLocation(),
10193 diag::note_objc_designated_init_marked_here);
10195 getCurFunction()->ObjCWarnForNoDesignatedInitChain = false;
10197 if (getCurFunction()->ObjCWarnForNoInitDelegation) {
10198 // Don't issue this warning for unavaialable inits.
10199 if (!MD->isUnavailable())
10200 Diag(MD->getLocation(), diag::warn_objc_secondary_init_missing_init_call);
10201 getCurFunction()->ObjCWarnForNoInitDelegation = false;
10207 assert(!getCurFunction()->ObjCShouldCallSuper &&
10208 "This should only be set for ObjC methods, which should have been "
10209 "handled in the block above.");
10211 // Verify and clean out per-function state.
10213 // C++ constructors that have function-try-blocks can't have return
10214 // statements in the handlers of that block. (C++ [except.handle]p14)
10216 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
10217 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
10219 // Verify that gotos and switch cases don't jump into scopes illegally.
10220 if (getCurFunction()->NeedsScopeChecking() &&
10221 !PP.isCodeCompletionEnabled())
10222 DiagnoseInvalidJumps(Body);
10224 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
10225 if (!Destructor->getParent()->isDependentType())
10226 CheckDestructor(Destructor);
10228 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
10229 Destructor->getParent());
10232 // If any errors have occurred, clear out any temporaries that may have
10233 // been leftover. This ensures that these temporaries won't be picked up for
10234 // deletion in some later function.
10235 if (getDiagnostics().hasErrorOccurred() ||
10236 getDiagnostics().getSuppressAllDiagnostics()) {
10237 DiscardCleanupsInEvaluationContext();
10239 if (!getDiagnostics().hasUncompilableErrorOccurred() &&
10240 !isa<FunctionTemplateDecl>(dcl)) {
10241 // Since the body is valid, issue any analysis-based warnings that are
10243 ActivePolicy = &WP;
10246 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
10247 (!CheckConstexprFunctionDecl(FD) ||
10248 !CheckConstexprFunctionBody(FD, Body)))
10249 FD->setInvalidDecl();
10251 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function");
10252 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
10253 assert(MaybeODRUseExprs.empty() &&
10254 "Leftover expressions for odr-use checking");
10257 if (!IsInstantiation)
10260 PopFunctionScopeInfo(ActivePolicy, dcl);
10261 // If any errors have occurred, clear out any temporaries that may have
10262 // been leftover. This ensures that these temporaries won't be picked up for
10263 // deletion in some later function.
10264 if (getDiagnostics().hasErrorOccurred()) {
10265 DiscardCleanupsInEvaluationContext();
10272 /// When we finish delayed parsing of an attribute, we must attach it to the
10274 void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
10275 ParsedAttributes &Attrs) {
10276 // Always attach attributes to the underlying decl.
10277 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
10278 D = TD->getTemplatedDecl();
10279 ProcessDeclAttributeList(S, D, Attrs.getList());
10281 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D))
10282 if (Method->isStatic())
10283 checkThisInStaticMemberFunctionAttributes(Method);
10287 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function
10288 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
10289 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
10290 IdentifierInfo &II, Scope *S) {
10291 // Before we produce a declaration for an implicitly defined
10292 // function, see whether there was a locally-scoped declaration of
10293 // this name as a function or variable. If so, use that
10294 // (non-visible) declaration, and complain about it.
10295 if (NamedDecl *ExternCPrev = findLocallyScopedExternCDecl(&II)) {
10296 Diag(Loc, diag::warn_use_out_of_scope_declaration) << ExternCPrev;
10297 Diag(ExternCPrev->getLocation(), diag::note_previous_declaration);
10298 return ExternCPrev;
10301 // Extension in C99. Legal in C90, but warn about it.
10303 if (II.getName().startswith("__builtin_"))
10304 diag_id = diag::warn_builtin_unknown;
10305 else if (getLangOpts().C99)
10306 diag_id = diag::ext_implicit_function_decl;
10308 diag_id = diag::warn_implicit_function_decl;
10309 Diag(Loc, diag_id) << &II;
10311 // Because typo correction is expensive, only do it if the implicit
10312 // function declaration is going to be treated as an error.
10313 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) {
10314 TypoCorrection Corrected;
10315 DeclFilterCCC<FunctionDecl> Validator;
10316 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc),
10317 LookupOrdinaryName, S, nullptr, Validator,
10319 diagnoseTypo(Corrected, PDiag(diag::note_function_suggestion),
10320 /*ErrorRecovery*/false);
10323 // Set a Declarator for the implicit definition: int foo();
10325 AttributeFactory attrFactory;
10326 DeclSpec DS(attrFactory);
10328 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID,
10329 Context.getPrintingPolicy());
10330 (void)Error; // Silence warning.
10331 assert(!Error && "Error setting up implicit decl!");
10332 SourceLocation NoLoc;
10333 Declarator D(DS, Declarator::BlockContext);
10334 D.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/false,
10335 /*IsAmbiguous=*/false,
10336 /*LParenLoc=*/NoLoc,
10337 /*Params=*/nullptr,
10339 /*EllipsisLoc=*/NoLoc,
10340 /*RParenLoc=*/NoLoc,
10342 /*RefQualifierIsLvalueRef=*/true,
10343 /*RefQualifierLoc=*/NoLoc,
10344 /*ConstQualifierLoc=*/NoLoc,
10345 /*VolatileQualifierLoc=*/NoLoc,
10346 /*MutableLoc=*/NoLoc,
10348 /*ESpecLoc=*/NoLoc,
10349 /*Exceptions=*/nullptr,
10350 /*ExceptionRanges=*/nullptr,
10351 /*NumExceptions=*/0,
10352 /*NoexceptExpr=*/nullptr,
10354 DS.getAttributes(),
10356 D.SetIdentifier(&II, Loc);
10358 // Insert this function into translation-unit scope.
10360 DeclContext *PrevDC = CurContext;
10361 CurContext = Context.getTranslationUnitDecl();
10363 FunctionDecl *FD = cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
10366 CurContext = PrevDC;
10368 AddKnownFunctionAttributes(FD);
10373 /// \brief Adds any function attributes that we know a priori based on
10374 /// the declaration of this function.
10376 /// These attributes can apply both to implicitly-declared builtins
10377 /// (like __builtin___printf_chk) or to library-declared functions
10378 /// like NSLog or printf.
10380 /// We need to check for duplicate attributes both here and where user-written
10381 /// attributes are applied to declarations.
10382 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
10383 if (FD->isInvalidDecl())
10386 // If this is a built-in function, map its builtin attributes to
10387 // actual attributes.
10388 if (unsigned BuiltinID = FD->getBuiltinID()) {
10389 // Handle printf-formatting attributes.
10390 unsigned FormatIdx;
10392 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
10393 if (!FD->hasAttr<FormatAttr>()) {
10394 const char *fmt = "printf";
10395 unsigned int NumParams = FD->getNumParams();
10396 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf)
10397 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType())
10399 FD->addAttr(FormatAttr::CreateImplicit(Context,
10400 &Context.Idents.get(fmt),
10402 HasVAListArg ? 0 : FormatIdx+2,
10403 FD->getLocation()));
10406 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
10408 if (!FD->hasAttr<FormatAttr>())
10409 FD->addAttr(FormatAttr::CreateImplicit(Context,
10410 &Context.Idents.get("scanf"),
10412 HasVAListArg ? 0 : FormatIdx+2,
10413 FD->getLocation()));
10416 // Mark const if we don't care about errno and that is the only
10417 // thing preventing the function from being const. This allows
10418 // IRgen to use LLVM intrinsics for such functions.
10419 if (!getLangOpts().MathErrno &&
10420 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
10421 if (!FD->hasAttr<ConstAttr>())
10422 FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation()));
10425 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
10426 !FD->hasAttr<ReturnsTwiceAttr>())
10427 FD->addAttr(ReturnsTwiceAttr::CreateImplicit(Context,
10428 FD->getLocation()));
10429 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->hasAttr<NoThrowAttr>())
10430 FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation()));
10431 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->hasAttr<ConstAttr>())
10432 FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation()));
10435 IdentifierInfo *Name = FD->getIdentifier();
10438 if ((!getLangOpts().CPlusPlus &&
10439 FD->getDeclContext()->isTranslationUnit()) ||
10440 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
10441 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
10442 LinkageSpecDecl::lang_c)) {
10443 // Okay: this could be a libc/libm/Objective-C function we know
10448 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
10449 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
10450 // target-specific builtins, perhaps?
10451 if (!FD->hasAttr<FormatAttr>())
10452 FD->addAttr(FormatAttr::CreateImplicit(Context,
10453 &Context.Idents.get("printf"), 2,
10454 Name->isStr("vasprintf") ? 0 : 3,
10455 FD->getLocation()));
10458 if (Name->isStr("__CFStringMakeConstantString")) {
10459 // We already have a __builtin___CFStringMakeConstantString,
10460 // but builds that use -fno-constant-cfstrings don't go through that.
10461 if (!FD->hasAttr<FormatArgAttr>())
10462 FD->addAttr(FormatArgAttr::CreateImplicit(Context, 1,
10463 FD->getLocation()));
10467 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
10468 TypeSourceInfo *TInfo) {
10469 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
10470 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
10473 assert(D.isInvalidType() && "no declarator info for valid type");
10474 TInfo = Context.getTrivialTypeSourceInfo(T);
10477 // Scope manipulation handled by caller.
10478 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
10480 D.getIdentifierLoc(),
10484 // Bail out immediately if we have an invalid declaration.
10485 if (D.isInvalidType()) {
10486 NewTD->setInvalidDecl();
10490 if (D.getDeclSpec().isModulePrivateSpecified()) {
10491 if (CurContext->isFunctionOrMethod())
10492 Diag(NewTD->getLocation(), diag::err_module_private_local)
10493 << 2 << NewTD->getDeclName()
10494 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
10495 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
10497 NewTD->setModulePrivate();
10500 // C++ [dcl.typedef]p8:
10501 // If the typedef declaration defines an unnamed class (or
10502 // enum), the first typedef-name declared by the declaration
10503 // to be that class type (or enum type) is used to denote the
10504 // class type (or enum type) for linkage purposes only.
10505 // We need to check whether the type was declared in the declaration.
10506 switch (D.getDeclSpec().getTypeSpecType()) {
10509 case TST_interface:
10512 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
10514 // Do nothing if the tag is not anonymous or already has an
10515 // associated typedef (from an earlier typedef in this decl group).
10516 if (tagFromDeclSpec->getIdentifier()) break;
10517 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break;
10519 // A well-formed anonymous tag must always be a TUK_Definition.
10520 assert(tagFromDeclSpec->isThisDeclarationADefinition());
10522 // The type must match the tag exactly; no qualifiers allowed.
10523 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec)))
10526 // If we've already computed linkage for the anonymous tag, then
10527 // adding a typedef name for the anonymous decl can change that
10528 // linkage, which might be a serious problem. Diagnose this as
10529 // unsupported and ignore the typedef name. TODO: we should
10530 // pursue this as a language defect and establish a formal rule
10531 // for how to handle it.
10532 if (tagFromDeclSpec->hasLinkageBeenComputed()) {
10533 Diag(D.getIdentifierLoc(), diag::err_typedef_changes_linkage);
10535 SourceLocation tagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
10536 tagLoc = getLocForEndOfToken(tagLoc);
10538 llvm::SmallString<40> textToInsert;
10539 textToInsert += ' ';
10540 textToInsert += D.getIdentifier()->getName();
10541 Diag(tagLoc, diag::note_typedef_changes_linkage)
10542 << FixItHint::CreateInsertion(tagLoc, textToInsert);
10546 // Otherwise, set this is the anon-decl typedef for the tag.
10547 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
10559 /// \brief Check that this is a valid underlying type for an enum declaration.
10560 bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) {
10561 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
10562 QualType T = TI->getType();
10564 if (T->isDependentType())
10567 if (const BuiltinType *BT = T->getAs<BuiltinType>())
10568 if (BT->isInteger())
10571 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T;
10575 /// Check whether this is a valid redeclaration of a previous enumeration.
10576 /// \return true if the redeclaration was invalid.
10577 bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
10578 QualType EnumUnderlyingTy,
10579 const EnumDecl *Prev) {
10580 bool IsFixed = !EnumUnderlyingTy.isNull();
10582 if (IsScoped != Prev->isScoped()) {
10583 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch)
10584 << Prev->isScoped();
10585 Diag(Prev->getLocation(), diag::note_previous_declaration);
10589 if (IsFixed && Prev->isFixed()) {
10590 if (!EnumUnderlyingTy->isDependentType() &&
10591 !Prev->getIntegerType()->isDependentType() &&
10592 !Context.hasSameUnqualifiedType(EnumUnderlyingTy,
10593 Prev->getIntegerType())) {
10594 // TODO: Highlight the underlying type of the redeclaration.
10595 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch)
10596 << EnumUnderlyingTy << Prev->getIntegerType();
10597 Diag(Prev->getLocation(), diag::note_previous_declaration)
10598 << Prev->getIntegerTypeRange();
10601 } else if (IsFixed != Prev->isFixed()) {
10602 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch)
10603 << Prev->isFixed();
10604 Diag(Prev->getLocation(), diag::note_previous_declaration);
10611 /// \brief Get diagnostic %select index for tag kind for
10612 /// redeclaration diagnostic message.
10613 /// WARNING: Indexes apply to particular diagnostics only!
10615 /// \returns diagnostic %select index.
10616 static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) {
10618 case TTK_Struct: return 0;
10619 case TTK_Interface: return 1;
10620 case TTK_Class: return 2;
10621 default: llvm_unreachable("Invalid tag kind for redecl diagnostic!");
10625 /// \brief Determine if tag kind is a class-key compatible with
10626 /// class for redeclaration (class, struct, or __interface).
10628 /// \returns true iff the tag kind is compatible.
10629 static bool isClassCompatTagKind(TagTypeKind Tag)
10631 return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface;
10634 /// \brief Determine whether a tag with a given kind is acceptable
10635 /// as a redeclaration of the given tag declaration.
10637 /// \returns true if the new tag kind is acceptable, false otherwise.
10638 bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
10639 TagTypeKind NewTag, bool isDefinition,
10640 SourceLocation NewTagLoc,
10641 const IdentifierInfo &Name) {
10642 // C++ [dcl.type.elab]p3:
10643 // The class-key or enum keyword present in the
10644 // elaborated-type-specifier shall agree in kind with the
10645 // declaration to which the name in the elaborated-type-specifier
10646 // refers. This rule also applies to the form of
10647 // elaborated-type-specifier that declares a class-name or
10648 // friend class since it can be construed as referring to the
10649 // definition of the class. Thus, in any
10650 // elaborated-type-specifier, the enum keyword shall be used to
10651 // refer to an enumeration (7.2), the union class-key shall be
10652 // used to refer to a union (clause 9), and either the class or
10653 // struct class-key shall be used to refer to a class (clause 9)
10654 // declared using the class or struct class-key.
10655 TagTypeKind OldTag = Previous->getTagKind();
10656 if (!isDefinition || !isClassCompatTagKind(NewTag))
10657 if (OldTag == NewTag)
10660 if (isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag)) {
10661 // Warn about the struct/class tag mismatch.
10662 bool isTemplate = false;
10663 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
10664 isTemplate = Record->getDescribedClassTemplate();
10666 if (!ActiveTemplateInstantiations.empty()) {
10667 // In a template instantiation, do not offer fix-its for tag mismatches
10668 // since they usually mess up the template instead of fixing the problem.
10669 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
10670 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
10671 << getRedeclDiagFromTagKind(OldTag);
10675 if (isDefinition) {
10676 // On definitions, check previous tags and issue a fix-it for each
10677 // one that doesn't match the current tag.
10678 if (Previous->getDefinition()) {
10679 // Don't suggest fix-its for redefinitions.
10683 bool previousMismatch = false;
10684 for (auto I : Previous->redecls()) {
10685 if (I->getTagKind() != NewTag) {
10686 if (!previousMismatch) {
10687 previousMismatch = true;
10688 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
10689 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
10690 << getRedeclDiagFromTagKind(I->getTagKind());
10692 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
10693 << getRedeclDiagFromTagKind(NewTag)
10694 << FixItHint::CreateReplacement(I->getInnerLocStart(),
10695 TypeWithKeyword::getTagTypeKindName(NewTag));
10701 // Check for a previous definition. If current tag and definition
10702 // are same type, do nothing. If no definition, but disagree with
10703 // with previous tag type, give a warning, but no fix-it.
10704 const TagDecl *Redecl = Previous->getDefinition() ?
10705 Previous->getDefinition() : Previous;
10706 if (Redecl->getTagKind() == NewTag) {
10710 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
10711 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
10712 << getRedeclDiagFromTagKind(OldTag);
10713 Diag(Redecl->getLocation(), diag::note_previous_use);
10715 // If there is a previous definition, suggest a fix-it.
10716 if (Previous->getDefinition()) {
10717 Diag(NewTagLoc, diag::note_struct_class_suggestion)
10718 << getRedeclDiagFromTagKind(Redecl->getTagKind())
10719 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
10720 TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind()));
10728 /// Add a minimal nested name specifier fixit hint to allow lookup of a tag name
10729 /// from an outer enclosing namespace or file scope inside a friend declaration.
10730 /// This should provide the commented out code in the following snippet:
10734 /// struct Y { friend struct /*N::*/ X; };
10737 static FixItHint createFriendTagNNSFixIt(Sema &SemaRef, NamedDecl *ND, Scope *S,
10738 SourceLocation NameLoc) {
10739 // While the decl is in a namespace, do repeated lookup of that name and see
10740 // if we get the same namespace back. If we do not, continue until
10741 // translation unit scope, at which point we have a fully qualified NNS.
10742 SmallVector<IdentifierInfo *, 4> Namespaces;
10743 DeclContext *DC = ND->getDeclContext()->getRedeclContext();
10744 for (; !DC->isTranslationUnit(); DC = DC->getParent()) {
10745 // This tag should be declared in a namespace, which can only be enclosed by
10746 // other namespaces. Bail if there's an anonymous namespace in the chain.
10747 NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(DC);
10748 if (!Namespace || Namespace->isAnonymousNamespace())
10749 return FixItHint();
10750 IdentifierInfo *II = Namespace->getIdentifier();
10751 Namespaces.push_back(II);
10752 NamedDecl *Lookup = SemaRef.LookupSingleName(
10753 S, II, NameLoc, Sema::LookupNestedNameSpecifierName);
10754 if (Lookup == Namespace)
10758 // Once we have all the namespaces, reverse them to go outermost first, and
10760 SmallString<64> Insertion;
10761 llvm::raw_svector_ostream OS(Insertion);
10762 if (DC->isTranslationUnit())
10764 std::reverse(Namespaces.begin(), Namespaces.end());
10765 for (auto *II : Namespaces)
10766 OS << II->getName() << "::";
10768 return FixItHint::CreateInsertion(NameLoc, Insertion);
10771 /// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
10772 /// former case, Name will be non-null. In the later case, Name will be null.
10773 /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
10774 /// reference/declaration/definition of a tag.
10776 /// IsTypeSpecifier is true if this is a type-specifier (or
10777 /// trailing-type-specifier) other than one in an alias-declaration.
10778 Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
10779 SourceLocation KWLoc, CXXScopeSpec &SS,
10780 IdentifierInfo *Name, SourceLocation NameLoc,
10781 AttributeList *Attr, AccessSpecifier AS,
10782 SourceLocation ModulePrivateLoc,
10783 MultiTemplateParamsArg TemplateParameterLists,
10784 bool &OwnedDecl, bool &IsDependent,
10785 SourceLocation ScopedEnumKWLoc,
10786 bool ScopedEnumUsesClassTag,
10787 TypeResult UnderlyingType,
10788 bool IsTypeSpecifier) {
10789 // If this is not a definition, it must have a name.
10790 IdentifierInfo *OrigName = Name;
10791 assert((Name != nullptr || TUK == TUK_Definition) &&
10792 "Nameless record must be a definition!");
10793 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
10796 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
10797 bool ScopedEnum = ScopedEnumKWLoc.isValid();
10799 // FIXME: Check explicit specializations more carefully.
10800 bool isExplicitSpecialization = false;
10801 bool Invalid = false;
10803 // We only need to do this matching if we have template parameters
10804 // or a scope specifier, which also conveniently avoids this work
10805 // for non-C++ cases.
10806 if (TemplateParameterLists.size() > 0 ||
10807 (SS.isNotEmpty() && TUK != TUK_Reference)) {
10808 if (TemplateParameterList *TemplateParams =
10809 MatchTemplateParametersToScopeSpecifier(
10810 KWLoc, NameLoc, SS, nullptr, TemplateParameterLists,
10811 TUK == TUK_Friend, isExplicitSpecialization, Invalid)) {
10812 if (Kind == TTK_Enum) {
10813 Diag(KWLoc, diag::err_enum_template);
10817 if (TemplateParams->size() > 0) {
10818 // This is a declaration or definition of a class template (which may
10819 // be a member of another template).
10825 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
10826 SS, Name, NameLoc, Attr,
10827 TemplateParams, AS,
10829 /*FriendLoc*/SourceLocation(),
10830 TemplateParameterLists.size()-1,
10831 TemplateParameterLists.data());
10832 return Result.get();
10834 // The "template<>" header is extraneous.
10835 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
10836 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
10837 isExplicitSpecialization = true;
10842 // Figure out the underlying type if this a enum declaration. We need to do
10843 // this early, because it's needed to detect if this is an incompatible
10845 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
10847 if (Kind == TTK_Enum) {
10848 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
10849 // No underlying type explicitly specified, or we failed to parse the
10850 // type, default to int.
10851 EnumUnderlying = Context.IntTy.getTypePtr();
10852 else if (UnderlyingType.get()) {
10853 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
10854 // integral type; any cv-qualification is ignored.
10855 TypeSourceInfo *TI = nullptr;
10856 GetTypeFromParser(UnderlyingType.get(), &TI);
10857 EnumUnderlying = TI;
10859 if (CheckEnumUnderlyingType(TI))
10860 // Recover by falling back to int.
10861 EnumUnderlying = Context.IntTy.getTypePtr();
10863 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI,
10864 UPPC_FixedUnderlyingType))
10865 EnumUnderlying = Context.IntTy.getTypePtr();
10867 } else if (getLangOpts().MSVCCompat)
10868 // Microsoft enums are always of int type.
10869 EnumUnderlying = Context.IntTy.getTypePtr();
10872 DeclContext *SearchDC = CurContext;
10873 DeclContext *DC = CurContext;
10874 bool isStdBadAlloc = false;
10876 RedeclarationKind Redecl = ForRedeclaration;
10877 if (TUK == TUK_Friend || TUK == TUK_Reference)
10878 Redecl = NotForRedeclaration;
10880 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
10881 if (Name && SS.isNotEmpty()) {
10882 // We have a nested-name tag ('struct foo::bar').
10884 // Check for invalid 'foo::'.
10885 if (SS.isInvalid()) {
10887 goto CreateNewDecl;
10890 // If this is a friend or a reference to a class in a dependent
10891 // context, don't try to make a decl for it.
10892 if (TUK == TUK_Friend || TUK == TUK_Reference) {
10893 DC = computeDeclContext(SS, false);
10895 IsDependent = true;
10899 DC = computeDeclContext(SS, true);
10901 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
10907 if (RequireCompleteDeclContext(SS, DC))
10911 // Look-up name inside 'foo::'.
10912 LookupQualifiedName(Previous, DC);
10914 if (Previous.isAmbiguous())
10917 if (Previous.empty()) {
10918 // Name lookup did not find anything. However, if the
10919 // nested-name-specifier refers to the current instantiation,
10920 // and that current instantiation has any dependent base
10921 // classes, we might find something at instantiation time: treat
10922 // this as a dependent elaborated-type-specifier.
10923 // But this only makes any sense for reference-like lookups.
10924 if (Previous.wasNotFoundInCurrentInstantiation() &&
10925 (TUK == TUK_Reference || TUK == TUK_Friend)) {
10926 IsDependent = true;
10930 // A tag 'foo::bar' must already exist.
10931 Diag(NameLoc, diag::err_not_tag_in_scope)
10932 << Kind << Name << DC << SS.getRange();
10935 goto CreateNewDecl;
10938 // If this is a named struct, check to see if there was a previous forward
10939 // declaration or definition.
10940 // FIXME: We're looking into outer scopes here, even when we
10941 // shouldn't be. Doing so can result in ambiguities that we
10942 // shouldn't be diagnosing.
10943 LookupName(Previous, S);
10945 // When declaring or defining a tag, ignore ambiguities introduced
10946 // by types using'ed into this scope.
10947 if (Previous.isAmbiguous() &&
10948 (TUK == TUK_Definition || TUK == TUK_Declaration)) {
10949 LookupResult::Filter F = Previous.makeFilter();
10950 while (F.hasNext()) {
10951 NamedDecl *ND = F.next();
10952 if (ND->getDeclContext()->getRedeclContext() != SearchDC)
10958 // C++11 [namespace.memdef]p3:
10959 // If the name in a friend declaration is neither qualified nor
10960 // a template-id and the declaration is a function or an
10961 // elaborated-type-specifier, the lookup to determine whether
10962 // the entity has been previously declared shall not consider
10963 // any scopes outside the innermost enclosing namespace.
10965 // MSVC doesn't implement the above rule for types, so a friend tag
10966 // declaration may be a redeclaration of a type declared in an enclosing
10967 // scope. They do implement this rule for friend functions.
10969 // Does it matter that this should be by scope instead of by
10970 // semantic context?
10971 if (!Previous.empty() && TUK == TUK_Friend) {
10972 DeclContext *EnclosingNS = SearchDC->getEnclosingNamespaceContext();
10973 LookupResult::Filter F = Previous.makeFilter();
10974 bool FriendSawTagOutsideEnclosingNamespace = false;
10975 while (F.hasNext()) {
10976 NamedDecl *ND = F.next();
10977 DeclContext *DC = ND->getDeclContext()->getRedeclContext();
10978 if (DC->isFileContext() &&
10979 !EnclosingNS->Encloses(ND->getDeclContext())) {
10980 if (getLangOpts().MSVCCompat)
10981 FriendSawTagOutsideEnclosingNamespace = true;
10988 // Diagnose this MSVC extension in the easy case where lookup would have
10989 // unambiguously found something outside the enclosing namespace.
10990 if (Previous.isSingleResult() && FriendSawTagOutsideEnclosingNamespace) {
10991 NamedDecl *ND = Previous.getFoundDecl();
10992 Diag(NameLoc, diag::ext_friend_tag_redecl_outside_namespace)
10993 << createFriendTagNNSFixIt(*this, ND, S, NameLoc);
10997 // Note: there used to be some attempt at recovery here.
10998 if (Previous.isAmbiguous())
11001 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) {
11002 // FIXME: This makes sure that we ignore the contexts associated
11003 // with C structs, unions, and enums when looking for a matching
11004 // tag declaration or definition. See the similar lookup tweak
11005 // in Sema::LookupName; is there a better way to deal with this?
11006 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
11007 SearchDC = SearchDC->getParent();
11011 if (Previous.isSingleResult() &&
11012 Previous.getFoundDecl()->isTemplateParameter()) {
11013 // Maybe we will complain about the shadowed template parameter.
11014 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
11015 // Just pretend that we didn't see the previous declaration.
11019 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace &&
11020 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
11021 // This is a declaration of or a reference to "std::bad_alloc".
11022 isStdBadAlloc = true;
11024 if (Previous.empty() && StdBadAlloc) {
11025 // std::bad_alloc has been implicitly declared (but made invisible to
11026 // name lookup). Fill in this implicit declaration as the previous
11027 // declaration, so that the declarations get chained appropriately.
11028 Previous.addDecl(getStdBadAlloc());
11032 // If we didn't find a previous declaration, and this is a reference
11033 // (or friend reference), move to the correct scope. In C++, we
11034 // also need to do a redeclaration lookup there, just in case
11035 // there's a shadow friend decl.
11036 if (Name && Previous.empty() &&
11037 (TUK == TUK_Reference || TUK == TUK_Friend)) {
11038 if (Invalid) goto CreateNewDecl;
11039 assert(SS.isEmpty());
11041 if (TUK == TUK_Reference) {
11042 // C++ [basic.scope.pdecl]p5:
11043 // -- for an elaborated-type-specifier of the form
11045 // class-key identifier
11047 // if the elaborated-type-specifier is used in the
11048 // decl-specifier-seq or parameter-declaration-clause of a
11049 // function defined in namespace scope, the identifier is
11050 // declared as a class-name in the namespace that contains
11051 // the declaration; otherwise, except as a friend
11052 // declaration, the identifier is declared in the smallest
11053 // non-class, non-function-prototype scope that contains the
11056 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
11057 // C structs and unions.
11059 // It is an error in C++ to declare (rather than define) an enum
11060 // type, including via an elaborated type specifier. We'll
11061 // diagnose that later; for now, declare the enum in the same
11062 // scope as we would have picked for any other tag type.
11064 // GNU C also supports this behavior as part of its incomplete
11065 // enum types extension, while GNU C++ does not.
11067 // Find the context where we'll be declaring the tag.
11068 // FIXME: We would like to maintain the current DeclContext as the
11069 // lexical context,
11070 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod())
11071 SearchDC = SearchDC->getParent();
11073 // Find the scope where we'll be declaring the tag.
11074 while (S->isClassScope() ||
11075 (getLangOpts().CPlusPlus &&
11076 S->isFunctionPrototypeScope()) ||
11077 ((S->getFlags() & Scope::DeclScope) == 0) ||
11078 (S->getEntity() && S->getEntity()->isTransparentContext()))
11079 S = S->getParent();
11081 assert(TUK == TUK_Friend);
11082 // C++ [namespace.memdef]p3:
11083 // If a friend declaration in a non-local class first declares a
11084 // class or function, the friend class or function is a member of
11085 // the innermost enclosing namespace.
11086 SearchDC = SearchDC->getEnclosingNamespaceContext();
11089 // In C++, we need to do a redeclaration lookup to properly
11090 // diagnose some problems.
11091 if (getLangOpts().CPlusPlus) {
11092 Previous.setRedeclarationKind(ForRedeclaration);
11093 LookupQualifiedName(Previous, SearchDC);
11097 if (!Previous.empty()) {
11098 NamedDecl *PrevDecl = Previous.getFoundDecl();
11099 NamedDecl *DirectPrevDecl =
11100 getLangOpts().MSVCCompat ? *Previous.begin() : PrevDecl;
11102 // It's okay to have a tag decl in the same scope as a typedef
11103 // which hides a tag decl in the same scope. Finding this
11104 // insanity with a redeclaration lookup can only actually happen
11107 // This is also okay for elaborated-type-specifiers, which is
11108 // technically forbidden by the current standard but which is
11109 // okay according to the likely resolution of an open issue;
11110 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
11111 if (getLangOpts().CPlusPlus) {
11112 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
11113 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
11114 TagDecl *Tag = TT->getDecl();
11115 if (Tag->getDeclName() == Name &&
11116 Tag->getDeclContext()->getRedeclContext()
11117 ->Equals(TD->getDeclContext()->getRedeclContext())) {
11120 Previous.addDecl(Tag);
11121 Previous.resolveKind();
11127 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
11128 // If this is a use of a previous tag, or if the tag is already declared
11129 // in the same scope (so that the definition/declaration completes or
11130 // rementions the tag), reuse the decl.
11131 if (TUK == TUK_Reference || TUK == TUK_Friend ||
11132 isDeclInScope(DirectPrevDecl, SearchDC, S,
11133 SS.isNotEmpty() || isExplicitSpecialization)) {
11134 // Make sure that this wasn't declared as an enum and now used as a
11135 // struct or something similar.
11136 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
11137 TUK == TUK_Definition, KWLoc,
11139 bool SafeToContinue
11140 = (PrevTagDecl->getTagKind() != TTK_Enum &&
11142 if (SafeToContinue)
11143 Diag(KWLoc, diag::err_use_with_wrong_tag)
11145 << FixItHint::CreateReplacement(SourceRange(KWLoc),
11146 PrevTagDecl->getKindName());
11148 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
11149 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
11151 if (SafeToContinue)
11152 Kind = PrevTagDecl->getTagKind();
11154 // Recover by making this an anonymous redefinition.
11161 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
11162 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
11164 // If this is an elaborated-type-specifier for a scoped enumeration,
11165 // the 'class' keyword is not necessary and not permitted.
11166 if (TUK == TUK_Reference || TUK == TUK_Friend) {
11168 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference)
11169 << PrevEnum->isScoped()
11170 << FixItHint::CreateRemoval(ScopedEnumKWLoc);
11171 return PrevTagDecl;
11174 QualType EnumUnderlyingTy;
11175 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
11176 EnumUnderlyingTy = TI->getType().getUnqualifiedType();
11177 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>())
11178 EnumUnderlyingTy = QualType(T, 0);
11180 // All conflicts with previous declarations are recovered by
11181 // returning the previous declaration, unless this is a definition,
11182 // in which case we want the caller to bail out.
11183 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc,
11184 ScopedEnum, EnumUnderlyingTy, PrevEnum))
11185 return TUK == TUK_Declaration ? PrevTagDecl : nullptr;
11188 // C++11 [class.mem]p1:
11189 // A member shall not be declared twice in the member-specification,
11190 // except that a nested class or member class template can be declared
11191 // and then later defined.
11192 if (TUK == TUK_Declaration && PrevDecl->isCXXClassMember() &&
11193 S->isDeclScope(PrevDecl)) {
11194 Diag(NameLoc, diag::ext_member_redeclared);
11195 Diag(PrevTagDecl->getLocation(), diag::note_previous_declaration);
11199 // If this is a use, just return the declaration we found, unless
11200 // we have attributes.
11202 // FIXME: In the future, return a variant or some other clue
11203 // for the consumer of this Decl to know it doesn't own it.
11204 // For our current ASTs this shouldn't be a problem, but will
11205 // need to be changed with DeclGroups.
11207 ((TUK == TUK_Reference &&
11208 (!PrevTagDecl->getFriendObjectKind() || getLangOpts().MicrosoftExt))
11209 || TUK == TUK_Friend))
11210 return PrevTagDecl;
11212 // Diagnose attempts to redefine a tag.
11213 if (TUK == TUK_Definition) {
11214 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
11215 // If we're defining a specialization and the previous definition
11216 // is from an implicit instantiation, don't emit an error
11217 // here; we'll catch this in the general case below.
11218 bool IsExplicitSpecializationAfterInstantiation = false;
11219 if (isExplicitSpecialization) {
11220 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def))
11221 IsExplicitSpecializationAfterInstantiation =
11222 RD->getTemplateSpecializationKind() !=
11223 TSK_ExplicitSpecialization;
11224 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def))
11225 IsExplicitSpecializationAfterInstantiation =
11226 ED->getTemplateSpecializationKind() !=
11227 TSK_ExplicitSpecialization;
11230 if (!IsExplicitSpecializationAfterInstantiation) {
11231 // A redeclaration in function prototype scope in C isn't
11232 // visible elsewhere, so merely issue a warning.
11233 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope())
11234 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name;
11236 Diag(NameLoc, diag::err_redefinition) << Name;
11237 Diag(Def->getLocation(), diag::note_previous_definition);
11238 // If this is a redefinition, recover by making this
11239 // struct be anonymous, which will make any later
11240 // references get the previous definition.
11246 // If the type is currently being defined, complain
11247 // about a nested redefinition.
11249 = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
11250 if (Tag->isBeingDefined()) {
11251 Diag(NameLoc, diag::err_nested_redefinition) << Name;
11252 Diag(PrevTagDecl->getLocation(),
11253 diag::note_previous_definition);
11260 // Okay, this is definition of a previously declared or referenced
11261 // tag. We're going to create a new Decl for it.
11264 // Okay, we're going to make a redeclaration. If this is some kind
11265 // of reference, make sure we build the redeclaration in the same DC
11266 // as the original, and ignore the current access specifier.
11267 if (TUK == TUK_Friend || TUK == TUK_Reference) {
11268 SearchDC = PrevTagDecl->getDeclContext();
11272 // If we get here we have (another) forward declaration or we
11273 // have a definition. Just create a new decl.
11276 // If we get here, this is a definition of a new tag type in a nested
11277 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
11278 // new decl/type. We set PrevDecl to NULL so that the entities
11279 // have distinct types.
11282 // If we get here, we're going to create a new Decl. If PrevDecl
11283 // is non-NULL, it's a definition of the tag declared by
11284 // PrevDecl. If it's NULL, we have a new definition.
11287 // Otherwise, PrevDecl is not a tag, but was found with tag
11288 // lookup. This is only actually possible in C++, where a few
11289 // things like templates still live in the tag namespace.
11291 // Use a better diagnostic if an elaborated-type-specifier
11292 // found the wrong kind of type on the first
11293 // (non-redeclaration) lookup.
11294 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
11295 !Previous.isForRedeclaration()) {
11297 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
11298 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
11299 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
11300 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
11301 Diag(PrevDecl->getLocation(), diag::note_declared_at);
11304 // Otherwise, only diagnose if the declaration is in scope.
11305 } else if (!isDeclInScope(PrevDecl, SearchDC, S,
11306 SS.isNotEmpty() || isExplicitSpecialization)) {
11309 // Diagnose implicit declarations introduced by elaborated types.
11310 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
11312 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
11313 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
11314 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
11315 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
11316 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
11319 // Otherwise it's a declaration. Call out a particularly common
11321 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
11323 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
11324 Diag(NameLoc, diag::err_tag_definition_of_typedef)
11325 << Name << Kind << TND->getUnderlyingType();
11326 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
11329 // Otherwise, diagnose.
11331 // The tag name clashes with something else in the target scope,
11332 // issue an error and recover by making this tag be anonymous.
11333 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
11334 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
11339 // The existing declaration isn't relevant to us; we're in a
11340 // new scope, so clear out the previous declaration.
11347 TagDecl *PrevDecl = nullptr;
11348 if (Previous.isSingleResult())
11349 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
11351 // If there is an identifier, use the location of the identifier as the
11352 // location of the decl, otherwise use the location of the struct/union
11354 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
11356 // Otherwise, create a new declaration. If there is a previous
11357 // declaration of the same entity, the two will be linked via
11361 bool IsForwardReference = false;
11362 if (Kind == TTK_Enum) {
11363 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
11364 // enum X { A, B, C } D; D should chain to X.
11365 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
11366 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
11367 ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
11368 // If this is an undefined enum, warn.
11369 if (TUK != TUK_Definition && !Invalid) {
11371 if ((getLangOpts().CPlusPlus11 || getLangOpts().ObjC2) &&
11372 cast<EnumDecl>(New)->isFixed()) {
11373 // C++0x: 7.2p2: opaque-enum-declaration.
11374 // Conflicts are diagnosed above. Do nothing.
11376 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
11377 Diag(Loc, diag::ext_forward_ref_enum_def)
11379 Diag(Def->getLocation(), diag::note_previous_definition);
11381 unsigned DiagID = diag::ext_forward_ref_enum;
11382 if (getLangOpts().MSVCCompat)
11383 DiagID = diag::ext_ms_forward_ref_enum;
11384 else if (getLangOpts().CPlusPlus)
11385 DiagID = diag::err_forward_ref_enum;
11388 // If this is a forward-declared reference to an enumeration, make a
11389 // note of it; we won't actually be introducing the declaration into
11390 // the declaration context.
11391 if (TUK == TUK_Reference)
11392 IsForwardReference = true;
11396 if (EnumUnderlying) {
11397 EnumDecl *ED = cast<EnumDecl>(New);
11398 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
11399 ED->setIntegerTypeSourceInfo(TI);
11401 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
11402 ED->setPromotionType(ED->getIntegerType());
11406 // struct/union/class
11408 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
11409 // struct X { int A; } D; D should chain to X.
11410 if (getLangOpts().CPlusPlus) {
11411 // FIXME: Look for a way to use RecordDecl for simple structs.
11412 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
11413 cast_or_null<CXXRecordDecl>(PrevDecl));
11415 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
11416 StdBadAlloc = cast<CXXRecordDecl>(New);
11418 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
11419 cast_or_null<RecordDecl>(PrevDecl));
11422 // C++11 [dcl.type]p3:
11423 // A type-specifier-seq shall not define a class or enumeration [...].
11424 if (getLangOpts().CPlusPlus && IsTypeSpecifier && TUK == TUK_Definition) {
11425 Diag(New->getLocation(), diag::err_type_defined_in_type_specifier)
11426 << Context.getTagDeclType(New);
11430 // Maybe add qualifier info.
11431 if (SS.isNotEmpty()) {
11433 // If this is either a declaration or a definition, check the
11434 // nested-name-specifier against the current context. We don't do this
11435 // for explicit specializations, because they have similar checking
11436 // (with more specific diagnostics) in the call to
11437 // CheckMemberSpecialization, below.
11438 if (!isExplicitSpecialization &&
11439 (TUK == TUK_Definition || TUK == TUK_Declaration) &&
11440 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc))
11443 New->setQualifierInfo(SS.getWithLocInContext(Context));
11444 if (TemplateParameterLists.size() > 0) {
11445 New->setTemplateParameterListsInfo(Context,
11446 TemplateParameterLists.size(),
11447 TemplateParameterLists.data());
11454 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
11455 // Add alignment attributes if necessary; these attributes are checked when
11456 // the ASTContext lays out the structure.
11458 // It is important for implementing the correct semantics that this
11459 // happen here (in act on tag decl). The #pragma pack stack is
11460 // maintained as a result of parser callbacks which can occur at
11461 // many points during the parsing of a struct declaration (because
11462 // the #pragma tokens are effectively skipped over during the
11463 // parsing of the struct).
11464 if (TUK == TUK_Definition) {
11465 AddAlignmentAttributesForRecord(RD);
11466 AddMsStructLayoutForRecord(RD);
11470 if (ModulePrivateLoc.isValid()) {
11471 if (isExplicitSpecialization)
11472 Diag(New->getLocation(), diag::err_module_private_specialization)
11474 << FixItHint::CreateRemoval(ModulePrivateLoc);
11475 // __module_private__ does not apply to local classes. However, we only
11476 // diagnose this as an error when the declaration specifiers are
11477 // freestanding. Here, we just ignore the __module_private__.
11478 else if (!SearchDC->isFunctionOrMethod())
11479 New->setModulePrivate();
11482 // If this is a specialization of a member class (of a class template),
11483 // check the specialization.
11484 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
11487 // If we're declaring or defining a tag in function prototype scope in C,
11488 // note that this type can only be used within the function and add it to
11489 // the list of decls to inject into the function definition scope.
11490 if ((Name || Kind == TTK_Enum) &&
11491 getNonFieldDeclScope(S)->isFunctionPrototypeScope()) {
11492 if (getLangOpts().CPlusPlus) {
11493 // C++ [dcl.fct]p6:
11494 // Types shall not be defined in return or parameter types.
11495 if (TUK == TUK_Definition && !IsTypeSpecifier) {
11496 Diag(Loc, diag::err_type_defined_in_param_type)
11501 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
11503 DeclsInPrototypeScope.push_back(New);
11507 New->setInvalidDecl();
11510 ProcessDeclAttributeList(S, New, Attr);
11512 // Set the lexical context. If the tag has a C++ scope specifier, the
11513 // lexical context will be different from the semantic context.
11514 New->setLexicalDeclContext(CurContext);
11516 // Mark this as a friend decl if applicable.
11517 // In Microsoft mode, a friend declaration also acts as a forward
11518 // declaration so we always pass true to setObjectOfFriendDecl to make
11519 // the tag name visible.
11520 if (TUK == TUK_Friend)
11521 New->setObjectOfFriendDecl(getLangOpts().MSVCCompat);
11523 // Set the access specifier.
11524 if (!Invalid && SearchDC->isRecord())
11525 SetMemberAccessSpecifier(New, PrevDecl, AS);
11527 if (TUK == TUK_Definition)
11528 New->startDefinition();
11530 // If this has an identifier, add it to the scope stack.
11531 if (TUK == TUK_Friend) {
11532 // We might be replacing an existing declaration in the lookup tables;
11533 // if so, borrow its access specifier.
11535 New->setAccess(PrevDecl->getAccess());
11537 DeclContext *DC = New->getDeclContext()->getRedeclContext();
11538 DC->makeDeclVisibleInContext(New);
11539 if (Name) // can be null along some error paths
11540 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
11541 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
11543 S = getNonFieldDeclScope(S);
11544 PushOnScopeChains(New, S, !IsForwardReference);
11545 if (IsForwardReference)
11546 SearchDC->makeDeclVisibleInContext(New);
11549 CurContext->addDecl(New);
11552 // If this is the C FILE type, notify the AST context.
11553 if (IdentifierInfo *II = New->getIdentifier())
11554 if (!New->isInvalidDecl() &&
11555 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
11557 Context.setFILEDecl(New);
11560 mergeDeclAttributes(New, PrevDecl);
11562 // If there's a #pragma GCC visibility in scope, set the visibility of this
11564 AddPushedVisibilityAttribute(New);
11567 // In C++, don't return an invalid declaration. We can't recover well from
11568 // the cases where we make the type anonymous.
11569 return (Invalid && getLangOpts().CPlusPlus) ? nullptr : New;
11572 void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
11573 AdjustDeclIfTemplate(TagD);
11574 TagDecl *Tag = cast<TagDecl>(TagD);
11576 // Enter the tag context.
11577 PushDeclContext(S, Tag);
11579 ActOnDocumentableDecl(TagD);
11581 // If there's a #pragma GCC visibility in scope, set the visibility of this
11583 AddPushedVisibilityAttribute(Tag);
11586 Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
11587 assert(isa<ObjCContainerDecl>(IDecl) &&
11588 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
11589 DeclContext *OCD = cast<DeclContext>(IDecl);
11590 assert(getContainingDC(OCD) == CurContext &&
11591 "The next DeclContext should be lexically contained in the current one.");
11596 void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
11597 SourceLocation FinalLoc,
11598 bool IsFinalSpelledSealed,
11599 SourceLocation LBraceLoc) {
11600 AdjustDeclIfTemplate(TagD);
11601 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
11603 FieldCollector->StartClass();
11605 if (!Record->getIdentifier())
11608 if (FinalLoc.isValid())
11609 Record->addAttr(new (Context)
11610 FinalAttr(FinalLoc, Context, IsFinalSpelledSealed));
11613 // [...] The class-name is also inserted into the scope of the
11614 // class itself; this is known as the injected-class-name. For
11615 // purposes of access checking, the injected-class-name is treated
11616 // as if it were a public member name.
11617 CXXRecordDecl *InjectedClassName
11618 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
11619 Record->getLocStart(), Record->getLocation(),
11620 Record->getIdentifier(),
11621 /*PrevDecl=*/nullptr,
11622 /*DelayTypeCreation=*/true);
11623 Context.getTypeDeclType(InjectedClassName, Record);
11624 InjectedClassName->setImplicit();
11625 InjectedClassName->setAccess(AS_public);
11626 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
11627 InjectedClassName->setDescribedClassTemplate(Template);
11628 PushOnScopeChains(InjectedClassName, S);
11629 assert(InjectedClassName->isInjectedClassName() &&
11630 "Broken injected-class-name");
11633 void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
11634 SourceLocation RBraceLoc) {
11635 AdjustDeclIfTemplate(TagD);
11636 TagDecl *Tag = cast<TagDecl>(TagD);
11637 Tag->setRBraceLoc(RBraceLoc);
11639 // Make sure we "complete" the definition even it is invalid.
11640 if (Tag->isBeingDefined()) {
11641 assert(Tag->isInvalidDecl() && "We should already have completed it");
11642 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
11643 RD->completeDefinition();
11646 if (isa<CXXRecordDecl>(Tag))
11647 FieldCollector->FinishClass();
11649 // Exit this scope of this tag's definition.
11652 if (getCurLexicalContext()->isObjCContainer() &&
11653 Tag->getDeclContext()->isFileContext())
11654 Tag->setTopLevelDeclInObjCContainer();
11656 // Notify the consumer that we've defined a tag.
11657 if (!Tag->isInvalidDecl())
11658 Consumer.HandleTagDeclDefinition(Tag);
11661 void Sema::ActOnObjCContainerFinishDefinition() {
11662 // Exit this scope of this interface definition.
11666 void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) {
11667 assert(DC == CurContext && "Mismatch of container contexts");
11668 OriginalLexicalContext = DC;
11669 ActOnObjCContainerFinishDefinition();
11672 void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) {
11673 ActOnObjCContainerStartDefinition(cast<Decl>(DC));
11674 OriginalLexicalContext = nullptr;
11677 void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
11678 AdjustDeclIfTemplate(TagD);
11679 TagDecl *Tag = cast<TagDecl>(TagD);
11680 Tag->setInvalidDecl();
11682 // Make sure we "complete" the definition even it is invalid.
11683 if (Tag->isBeingDefined()) {
11684 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
11685 RD->completeDefinition();
11688 // We're undoing ActOnTagStartDefinition here, not
11689 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
11690 // the FieldCollector.
11695 // Note that FieldName may be null for anonymous bitfields.
11696 ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
11697 IdentifierInfo *FieldName,
11698 QualType FieldTy, bool IsMsStruct,
11699 Expr *BitWidth, bool *ZeroWidth) {
11700 // Default to true; that shouldn't confuse checks for emptiness
11704 // C99 6.7.2.1p4 - verify the field type.
11705 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
11706 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
11707 // Handle incomplete types with specific error.
11708 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
11709 return ExprError();
11711 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
11712 << FieldName << FieldTy << BitWidth->getSourceRange();
11713 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
11714 << FieldTy << BitWidth->getSourceRange();
11715 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
11716 UPPC_BitFieldWidth))
11717 return ExprError();
11719 // If the bit-width is type- or value-dependent, don't try to check
11721 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
11724 llvm::APSInt Value;
11725 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value);
11726 if (ICE.isInvalid())
11728 BitWidth = ICE.get();
11730 if (Value != 0 && ZeroWidth)
11731 *ZeroWidth = false;
11733 // Zero-width bitfield is ok for anonymous field.
11734 if (Value == 0 && FieldName)
11735 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
11737 if (Value.isSigned() && Value.isNegative()) {
11739 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
11740 << FieldName << Value.toString(10);
11741 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
11742 << Value.toString(10);
11745 if (!FieldTy->isDependentType()) {
11746 uint64_t TypeSize = Context.getTypeSize(FieldTy);
11747 if (Value.getZExtValue() > TypeSize) {
11748 if (!getLangOpts().CPlusPlus || IsMsStruct ||
11749 Context.getTargetInfo().getCXXABI().isMicrosoft()) {
11751 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
11752 << FieldName << (unsigned)Value.getZExtValue()
11753 << (unsigned)TypeSize;
11755 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
11756 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
11760 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
11761 << FieldName << (unsigned)Value.getZExtValue()
11762 << (unsigned)TypeSize;
11764 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
11765 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
11772 /// ActOnField - Each field of a C struct/union is passed into this in order
11773 /// to create a FieldDecl object for it.
11774 Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
11775 Declarator &D, Expr *BitfieldWidth) {
11776 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
11777 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
11778 /*InitStyle=*/ICIS_NoInit, AS_public);
11782 /// HandleField - Analyze a field of a C struct or a C++ data member.
11784 FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
11785 SourceLocation DeclStart,
11786 Declarator &D, Expr *BitWidth,
11787 InClassInitStyle InitStyle,
11788 AccessSpecifier AS) {
11789 IdentifierInfo *II = D.getIdentifier();
11790 SourceLocation Loc = DeclStart;
11791 if (II) Loc = D.getIdentifierLoc();
11793 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
11794 QualType T = TInfo->getType();
11795 if (getLangOpts().CPlusPlus) {
11796 CheckExtraCXXDefaultArguments(D);
11798 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
11799 UPPC_DataMemberType)) {
11800 D.setInvalidType();
11802 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
11806 // TR 18037 does not allow fields to be declared with address spaces.
11807 if (T.getQualifiers().hasAddressSpace()) {
11808 Diag(Loc, diag::err_field_with_address_space);
11809 D.setInvalidType();
11812 // OpenCL 1.2 spec, s6.9 r:
11813 // The event type cannot be used to declare a structure or union field.
11814 if (LangOpts.OpenCL && T->isEventT()) {
11815 Diag(Loc, diag::err_event_t_struct_field);
11816 D.setInvalidType();
11819 DiagnoseFunctionSpecifiers(D.getDeclSpec());
11821 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
11822 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
11823 diag::err_invalid_thread)
11824 << DeclSpec::getSpecifierName(TSCS);
11826 // Check to see if this name was declared as a member previously
11827 NamedDecl *PrevDecl = nullptr;
11828 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
11829 LookupName(Previous, S);
11830 switch (Previous.getResultKind()) {
11831 case LookupResult::Found:
11832 case LookupResult::FoundUnresolvedValue:
11833 PrevDecl = Previous.getAsSingle<NamedDecl>();
11836 case LookupResult::FoundOverloaded:
11837 PrevDecl = Previous.getRepresentativeDecl();
11840 case LookupResult::NotFound:
11841 case LookupResult::NotFoundInCurrentInstantiation:
11842 case LookupResult::Ambiguous:
11845 Previous.suppressDiagnostics();
11847 if (PrevDecl && PrevDecl->isTemplateParameter()) {
11848 // Maybe we will complain about the shadowed template parameter.
11849 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
11850 // Just pretend that we didn't see the previous declaration.
11851 PrevDecl = nullptr;
11854 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
11855 PrevDecl = nullptr;
11858 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
11859 SourceLocation TSSL = D.getLocStart();
11861 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle,
11862 TSSL, AS, PrevDecl, &D);
11864 if (NewFD->isInvalidDecl())
11865 Record->setInvalidDecl();
11867 if (D.getDeclSpec().isModulePrivateSpecified())
11868 NewFD->setModulePrivate();
11870 if (NewFD->isInvalidDecl() && PrevDecl) {
11871 // Don't introduce NewFD into scope; there's already something
11872 // with the same name in the same scope.
11874 PushOnScopeChains(NewFD, S);
11876 Record->addDecl(NewFD);
11881 /// \brief Build a new FieldDecl and check its well-formedness.
11883 /// This routine builds a new FieldDecl given the fields name, type,
11884 /// record, etc. \p PrevDecl should refer to any previous declaration
11885 /// with the same name and in the same scope as the field to be
11888 /// \returns a new FieldDecl.
11890 /// \todo The Declarator argument is a hack. It will be removed once
11891 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
11892 TypeSourceInfo *TInfo,
11893 RecordDecl *Record, SourceLocation Loc,
11894 bool Mutable, Expr *BitWidth,
11895 InClassInitStyle InitStyle,
11896 SourceLocation TSSL,
11897 AccessSpecifier AS, NamedDecl *PrevDecl,
11899 IdentifierInfo *II = Name.getAsIdentifierInfo();
11900 bool InvalidDecl = false;
11901 if (D) InvalidDecl = D->isInvalidType();
11903 // If we receive a broken type, recover by assuming 'int' and
11904 // marking this declaration as invalid.
11906 InvalidDecl = true;
11910 QualType EltTy = Context.getBaseElementType(T);
11911 if (!EltTy->isDependentType()) {
11912 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
11913 // Fields of incomplete type force their record to be invalid.
11914 Record->setInvalidDecl();
11915 InvalidDecl = true;
11918 EltTy->isIncompleteType(&Def);
11919 if (Def && Def->isInvalidDecl()) {
11920 Record->setInvalidDecl();
11921 InvalidDecl = true;
11926 // OpenCL v1.2 s6.9.c: bitfields are not supported.
11927 if (BitWidth && getLangOpts().OpenCL) {
11928 Diag(Loc, diag::err_opencl_bitfields);
11929 InvalidDecl = true;
11932 // C99 6.7.2.1p8: A member of a structure or union may have any type other
11933 // than a variably modified type.
11934 if (!InvalidDecl && T->isVariablyModifiedType()) {
11935 bool SizeIsNegative;
11936 llvm::APSInt Oversized;
11938 TypeSourceInfo *FixedTInfo =
11939 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
11943 Diag(Loc, diag::warn_illegal_constant_array_size);
11944 TInfo = FixedTInfo;
11945 T = FixedTInfo->getType();
11947 if (SizeIsNegative)
11948 Diag(Loc, diag::err_typecheck_negative_array_size);
11949 else if (Oversized.getBoolValue())
11950 Diag(Loc, diag::err_array_too_large)
11951 << Oversized.toString(10);
11953 Diag(Loc, diag::err_typecheck_field_variable_size);
11954 InvalidDecl = true;
11958 // Fields can not have abstract class types
11959 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
11960 diag::err_abstract_type_in_decl,
11961 AbstractFieldType))
11962 InvalidDecl = true;
11964 bool ZeroWidth = false;
11965 // If this is declared as a bit-field, check the bit-field.
11966 if (!InvalidDecl && BitWidth) {
11967 BitWidth = VerifyBitField(Loc, II, T, Record->isMsStruct(Context), BitWidth,
11970 InvalidDecl = true;
11971 BitWidth = nullptr;
11976 // Check that 'mutable' is consistent with the type of the declaration.
11977 if (!InvalidDecl && Mutable) {
11978 unsigned DiagID = 0;
11979 if (T->isReferenceType())
11980 DiagID = diag::err_mutable_reference;
11981 else if (T.isConstQualified())
11982 DiagID = diag::err_mutable_const;
11985 SourceLocation ErrLoc = Loc;
11986 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
11987 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
11988 Diag(ErrLoc, DiagID);
11990 InvalidDecl = true;
11994 // C++11 [class.union]p8 (DR1460):
11995 // At most one variant member of a union may have a
11996 // brace-or-equal-initializer.
11997 if (InitStyle != ICIS_NoInit)
11998 checkDuplicateDefaultInit(*this, cast<CXXRecordDecl>(Record), Loc);
12000 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
12001 BitWidth, Mutable, InitStyle);
12003 NewFD->setInvalidDecl();
12005 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
12006 Diag(Loc, diag::err_duplicate_member) << II;
12007 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
12008 NewFD->setInvalidDecl();
12011 if (!InvalidDecl && getLangOpts().CPlusPlus) {
12012 if (Record->isUnion()) {
12013 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
12014 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
12015 if (RDecl->getDefinition()) {
12016 // C++ [class.union]p1: An object of a class with a non-trivial
12017 // constructor, a non-trivial copy constructor, a non-trivial
12018 // destructor, or a non-trivial copy assignment operator
12019 // cannot be a member of a union, nor can an array of such
12021 if (CheckNontrivialField(NewFD))
12022 NewFD->setInvalidDecl();
12026 // C++ [class.union]p1: If a union contains a member of reference type,
12027 // the program is ill-formed, except when compiling with MSVC extensions
12029 if (EltTy->isReferenceType()) {
12030 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
12031 diag::ext_union_member_of_reference_type :
12032 diag::err_union_member_of_reference_type)
12033 << NewFD->getDeclName() << EltTy;
12034 if (!getLangOpts().MicrosoftExt)
12035 NewFD->setInvalidDecl();
12040 // FIXME: We need to pass in the attributes given an AST
12041 // representation, not a parser representation.
12043 // FIXME: The current scope is almost... but not entirely... correct here.
12044 ProcessDeclAttributes(getCurScope(), NewFD, *D);
12046 if (NewFD->hasAttrs())
12047 CheckAlignasUnderalignment(NewFD);
12050 // In auto-retain/release, infer strong retension for fields of
12051 // retainable type.
12052 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
12053 NewFD->setInvalidDecl();
12055 if (T.isObjCGCWeak())
12056 Diag(Loc, diag::warn_attribute_weak_on_field);
12058 NewFD->setAccess(AS);
12062 bool Sema::CheckNontrivialField(FieldDecl *FD) {
12064 assert(getLangOpts().CPlusPlus && "valid check only for C++");
12066 if (FD->isInvalidDecl() || FD->getType()->isDependentType())
12069 QualType EltTy = Context.getBaseElementType(FD->getType());
12070 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
12071 CXXRecordDecl *RDecl = cast<CXXRecordDecl>(RT->getDecl());
12072 if (RDecl->getDefinition()) {
12073 // We check for copy constructors before constructors
12074 // because otherwise we'll never get complaints about
12075 // copy constructors.
12077 CXXSpecialMember member = CXXInvalid;
12078 // We're required to check for any non-trivial constructors. Since the
12079 // implicit default constructor is suppressed if there are any
12080 // user-declared constructors, we just need to check that there is a
12081 // trivial default constructor and a trivial copy constructor. (We don't
12082 // worry about move constructors here, since this is a C++98 check.)
12083 if (RDecl->hasNonTrivialCopyConstructor())
12084 member = CXXCopyConstructor;
12085 else if (!RDecl->hasTrivialDefaultConstructor())
12086 member = CXXDefaultConstructor;
12087 else if (RDecl->hasNonTrivialCopyAssignment())
12088 member = CXXCopyAssignment;
12089 else if (RDecl->hasNonTrivialDestructor())
12090 member = CXXDestructor;
12092 if (member != CXXInvalid) {
12093 if (!getLangOpts().CPlusPlus11 &&
12094 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) {
12095 // Objective-C++ ARC: it is an error to have a non-trivial field of
12096 // a union. However, system headers in Objective-C programs
12097 // occasionally have Objective-C lifetime objects within unions,
12098 // and rather than cause the program to fail, we make those
12099 // members unavailable.
12100 SourceLocation Loc = FD->getLocation();
12101 if (getSourceManager().isInSystemHeader(Loc)) {
12102 if (!FD->hasAttr<UnavailableAttr>())
12103 FD->addAttr(UnavailableAttr::CreateImplicit(Context,
12104 "this system field has retaining ownership",
12110 Diag(FD->getLocation(), getLangOpts().CPlusPlus11 ?
12111 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member :
12112 diag::err_illegal_union_or_anon_struct_member)
12113 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
12114 DiagnoseNontrivial(RDecl, member);
12115 return !getLangOpts().CPlusPlus11;
12123 /// TranslateIvarVisibility - Translate visibility from a token ID to an
12124 /// AST enum value.
12125 static ObjCIvarDecl::AccessControl
12126 TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
12127 switch (ivarVisibility) {
12128 default: llvm_unreachable("Unknown visitibility kind");
12129 case tok::objc_private: return ObjCIvarDecl::Private;
12130 case tok::objc_public: return ObjCIvarDecl::Public;
12131 case tok::objc_protected: return ObjCIvarDecl::Protected;
12132 case tok::objc_package: return ObjCIvarDecl::Package;
12136 /// ActOnIvar - Each ivar field of an objective-c class is passed into this
12137 /// in order to create an IvarDecl object for it.
12138 Decl *Sema::ActOnIvar(Scope *S,
12139 SourceLocation DeclStart,
12140 Declarator &D, Expr *BitfieldWidth,
12141 tok::ObjCKeywordKind Visibility) {
12143 IdentifierInfo *II = D.getIdentifier();
12144 Expr *BitWidth = (Expr*)BitfieldWidth;
12145 SourceLocation Loc = DeclStart;
12146 if (II) Loc = D.getIdentifierLoc();
12148 // FIXME: Unnamed fields can be handled in various different ways, for
12149 // example, unnamed unions inject all members into the struct namespace!
12151 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
12152 QualType T = TInfo->getType();
12155 // 6.7.2.1p3, 6.7.2.1p4
12156 BitWidth = VerifyBitField(Loc, II, T, /*IsMsStruct*/false, BitWidth).get();
12158 D.setInvalidType();
12165 if (T->isReferenceType()) {
12166 Diag(Loc, diag::err_ivar_reference_type);
12167 D.setInvalidType();
12169 // C99 6.7.2.1p8: A member of a structure or union may have any type other
12170 // than a variably modified type.
12171 else if (T->isVariablyModifiedType()) {
12172 Diag(Loc, diag::err_typecheck_ivar_variable_size);
12173 D.setInvalidType();
12176 // Get the visibility (access control) for this ivar.
12177 ObjCIvarDecl::AccessControl ac =
12178 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
12179 : ObjCIvarDecl::None;
12180 // Must set ivar's DeclContext to its enclosing interface.
12181 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
12182 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl())
12184 ObjCContainerDecl *EnclosingContext;
12185 if (ObjCImplementationDecl *IMPDecl =
12186 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
12187 if (LangOpts.ObjCRuntime.isFragile()) {
12188 // Case of ivar declared in an implementation. Context is that of its class.
12189 EnclosingContext = IMPDecl->getClassInterface();
12190 assert(EnclosingContext && "Implementation has no class interface!");
12193 EnclosingContext = EnclosingDecl;
12195 if (ObjCCategoryDecl *CDecl =
12196 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
12197 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) {
12198 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
12202 EnclosingContext = EnclosingDecl;
12205 // Construct the decl.
12206 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
12207 DeclStart, Loc, II, T,
12208 TInfo, ac, (Expr *)BitfieldWidth);
12211 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
12213 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
12214 && !isa<TagDecl>(PrevDecl)) {
12215 Diag(Loc, diag::err_duplicate_member) << II;
12216 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
12217 NewID->setInvalidDecl();
12221 // Process attributes attached to the ivar.
12222 ProcessDeclAttributes(S, NewID, D);
12224 if (D.isInvalidType())
12225 NewID->setInvalidDecl();
12227 // In ARC, infer 'retaining' for ivars of retainable type.
12228 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
12229 NewID->setInvalidDecl();
12231 if (D.getDeclSpec().isModulePrivateSpecified())
12232 NewID->setModulePrivate();
12235 // FIXME: When interfaces are DeclContexts, we'll need to add
12236 // these to the interface.
12238 IdResolver.AddDecl(NewID);
12241 if (LangOpts.ObjCRuntime.isNonFragile() &&
12242 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl))
12243 Diag(Loc, diag::warn_ivars_in_interface);
12248 /// ActOnLastBitfield - This routine handles synthesized bitfields rules for
12249 /// class and class extensions. For every class \@interface and class
12250 /// extension \@interface, if the last ivar is a bitfield of any type,
12251 /// then add an implicit `char :0` ivar to the end of that interface.
12252 void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
12253 SmallVectorImpl<Decl *> &AllIvarDecls) {
12254 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty())
12257 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
12258 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
12260 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
12262 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
12264 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
12265 if (!CD->IsClassExtension())
12268 // No need to add this to end of @implementation.
12272 // All conditions are met. Add a new bitfield to the tail end of ivars.
12273 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
12274 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
12276 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
12277 DeclLoc, DeclLoc, nullptr,
12279 Context.getTrivialTypeSourceInfo(Context.CharTy,
12281 ObjCIvarDecl::Private, BW,
12283 AllIvarDecls.push_back(Ivar);
12286 void Sema::ActOnFields(Scope *S, SourceLocation RecLoc, Decl *EnclosingDecl,
12287 ArrayRef<Decl *> Fields, SourceLocation LBrac,
12288 SourceLocation RBrac, AttributeList *Attr) {
12289 assert(EnclosingDecl && "missing record or interface decl");
12291 // If this is an Objective-C @implementation or category and we have
12292 // new fields here we should reset the layout of the interface since
12293 // it will now change.
12294 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) {
12295 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl);
12296 switch (DC->getKind()) {
12298 case Decl::ObjCCategory:
12299 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface());
12301 case Decl::ObjCImplementation:
12303 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface());
12308 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
12310 // Start counting up the number of named members; make sure to include
12311 // members of anonymous structs and unions in the total.
12312 unsigned NumNamedMembers = 0;
12314 for (const auto *I : Record->decls()) {
12315 if (const auto *IFD = dyn_cast<IndirectFieldDecl>(I))
12316 if (IFD->getDeclName())
12321 // Verify that all the fields are okay.
12322 SmallVector<FieldDecl*, 32> RecFields;
12324 bool ARCErrReported = false;
12325 for (ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
12327 FieldDecl *FD = cast<FieldDecl>(*i);
12329 // Get the type for the field.
12330 const Type *FDTy = FD->getType().getTypePtr();
12332 if (!FD->isAnonymousStructOrUnion()) {
12333 // Remember all fields written by the user.
12334 RecFields.push_back(FD);
12337 // If the field is already invalid for some reason, don't emit more
12338 // diagnostics about it.
12339 if (FD->isInvalidDecl()) {
12340 EnclosingDecl->setInvalidDecl();
12345 // A structure or union shall not contain a member with
12346 // incomplete or function type (hence, a structure shall not
12347 // contain an instance of itself, but may contain a pointer to
12348 // an instance of itself), except that the last member of a
12349 // structure with more than one named member may have incomplete
12350 // array type; such a structure (and any union containing,
12351 // possibly recursively, a member that is such a structure)
12352 // shall not be a member of a structure or an element of an
12354 if (FDTy->isFunctionType()) {
12355 // Field declared as a function.
12356 Diag(FD->getLocation(), diag::err_field_declared_as_function)
12357 << FD->getDeclName();
12358 FD->setInvalidDecl();
12359 EnclosingDecl->setInvalidDecl();
12361 } else if (FDTy->isIncompleteArrayType() && Record &&
12362 ((i + 1 == Fields.end() && !Record->isUnion()) ||
12363 ((getLangOpts().MicrosoftExt ||
12364 getLangOpts().CPlusPlus) &&
12365 (i + 1 == Fields.end() || Record->isUnion())))) {
12366 // Flexible array member.
12367 // Microsoft and g++ is more permissive regarding flexible array.
12368 // It will accept flexible array in union and also
12369 // as the sole element of a struct/class.
12370 unsigned DiagID = 0;
12371 if (Record->isUnion())
12372 DiagID = getLangOpts().MicrosoftExt
12373 ? diag::ext_flexible_array_union_ms
12374 : getLangOpts().CPlusPlus
12375 ? diag::ext_flexible_array_union_gnu
12376 : diag::err_flexible_array_union;
12377 else if (Fields.size() == 1)
12378 DiagID = getLangOpts().MicrosoftExt
12379 ? diag::ext_flexible_array_empty_aggregate_ms
12380 : getLangOpts().CPlusPlus
12381 ? diag::ext_flexible_array_empty_aggregate_gnu
12382 : NumNamedMembers < 1
12383 ? diag::err_flexible_array_empty_aggregate
12387 Diag(FD->getLocation(), DiagID) << FD->getDeclName()
12388 << Record->getTagKind();
12389 // While the layout of types that contain virtual bases is not specified
12390 // by the C++ standard, both the Itanium and Microsoft C++ ABIs place
12391 // virtual bases after the derived members. This would make a flexible
12392 // array member declared at the end of an object not adjacent to the end
12394 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Record))
12395 if (RD->getNumVBases() != 0)
12396 Diag(FD->getLocation(), diag::err_flexible_array_virtual_base)
12397 << FD->getDeclName() << Record->getTagKind();
12398 if (!getLangOpts().C99)
12399 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member)
12400 << FD->getDeclName() << Record->getTagKind();
12402 // If the element type has a non-trivial destructor, we would not
12403 // implicitly destroy the elements, so disallow it for now.
12405 // FIXME: GCC allows this. We should probably either implicitly delete
12406 // the destructor of the containing class, or just allow this.
12407 QualType BaseElem = Context.getBaseElementType(FD->getType());
12408 if (!BaseElem->isDependentType() && BaseElem.isDestructedType()) {
12409 Diag(FD->getLocation(), diag::err_flexible_array_has_nontrivial_dtor)
12410 << FD->getDeclName() << FD->getType();
12411 FD->setInvalidDecl();
12412 EnclosingDecl->setInvalidDecl();
12415 // Okay, we have a legal flexible array member at the end of the struct.
12417 Record->setHasFlexibleArrayMember(true);
12418 } else if (!FDTy->isDependentType() &&
12419 RequireCompleteType(FD->getLocation(), FD->getType(),
12420 diag::err_field_incomplete)) {
12422 FD->setInvalidDecl();
12423 EnclosingDecl->setInvalidDecl();
12425 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
12426 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
12427 // If this is a member of a union, then entire union becomes "flexible".
12428 if (Record && Record->isUnion()) {
12429 Record->setHasFlexibleArrayMember(true);
12431 // If this is a struct/class and this is not the last element, reject
12432 // it. Note that GCC supports variable sized arrays in the middle of
12434 if (i + 1 != Fields.end())
12435 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
12436 << FD->getDeclName() << FD->getType();
12438 // We support flexible arrays at the end of structs in
12439 // other structs as an extension.
12440 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
12441 << FD->getDeclName();
12443 Record->setHasFlexibleArrayMember(true);
12447 if (isa<ObjCContainerDecl>(EnclosingDecl) &&
12448 RequireNonAbstractType(FD->getLocation(), FD->getType(),
12449 diag::err_abstract_type_in_decl,
12450 AbstractIvarType)) {
12451 // Ivars can not have abstract class types
12452 FD->setInvalidDecl();
12454 if (Record && FDTTy->getDecl()->hasObjectMember())
12455 Record->setHasObjectMember(true);
12456 if (Record && FDTTy->getDecl()->hasVolatileMember())
12457 Record->setHasVolatileMember(true);
12458 } else if (FDTy->isObjCObjectType()) {
12459 /// A field cannot be an Objective-c object
12460 Diag(FD->getLocation(), diag::err_statically_allocated_object)
12461 << FixItHint::CreateInsertion(FD->getLocation(), "*");
12462 QualType T = Context.getObjCObjectPointerType(FD->getType());
12464 } else if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported &&
12465 (!getLangOpts().CPlusPlus || Record->isUnion())) {
12466 // It's an error in ARC if a field has lifetime.
12467 // We don't want to report this in a system header, though,
12468 // so we just make the field unavailable.
12469 // FIXME: that's really not sufficient; we need to make the type
12470 // itself invalid to, say, initialize or copy.
12471 QualType T = FD->getType();
12472 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
12473 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
12474 SourceLocation loc = FD->getLocation();
12475 if (getSourceManager().isInSystemHeader(loc)) {
12476 if (!FD->hasAttr<UnavailableAttr>()) {
12477 FD->addAttr(UnavailableAttr::CreateImplicit(Context,
12478 "this system field has retaining ownership",
12482 Diag(FD->getLocation(), diag::err_arc_objc_object_in_tag)
12483 << T->isBlockPointerType() << Record->getTagKind();
12485 ARCErrReported = true;
12487 } else if (getLangOpts().ObjC1 &&
12488 getLangOpts().getGC() != LangOptions::NonGC &&
12489 Record && !Record->hasObjectMember()) {
12490 if (FD->getType()->isObjCObjectPointerType() ||
12491 FD->getType().isObjCGCStrong())
12492 Record->setHasObjectMember(true);
12493 else if (Context.getAsArrayType(FD->getType())) {
12494 QualType BaseType = Context.getBaseElementType(FD->getType());
12495 if (BaseType->isRecordType() &&
12496 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
12497 Record->setHasObjectMember(true);
12498 else if (BaseType->isObjCObjectPointerType() ||
12499 BaseType.isObjCGCStrong())
12500 Record->setHasObjectMember(true);
12503 if (Record && FD->getType().isVolatileQualified())
12504 Record->setHasVolatileMember(true);
12505 // Keep track of the number of named members.
12506 if (FD->getIdentifier())
12510 // Okay, we successfully defined 'Record'.
12512 bool Completed = false;
12513 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
12514 if (!CXXRecord->isInvalidDecl()) {
12515 // Set access bits correctly on the directly-declared conversions.
12516 for (CXXRecordDecl::conversion_iterator
12517 I = CXXRecord->conversion_begin(),
12518 E = CXXRecord->conversion_end(); I != E; ++I)
12519 I.setAccess((*I)->getAccess());
12521 if (!CXXRecord->isDependentType()) {
12522 if (CXXRecord->hasUserDeclaredDestructor()) {
12523 // Adjust user-defined destructor exception spec.
12524 if (getLangOpts().CPlusPlus11)
12525 AdjustDestructorExceptionSpec(CXXRecord,
12526 CXXRecord->getDestructor());
12529 // Add any implicitly-declared members to this class.
12530 AddImplicitlyDeclaredMembersToClass(CXXRecord);
12532 // If we have virtual base classes, we may end up finding multiple
12533 // final overriders for a given virtual function. Check for this
12535 if (CXXRecord->getNumVBases()) {
12536 CXXFinalOverriderMap FinalOverriders;
12537 CXXRecord->getFinalOverriders(FinalOverriders);
12539 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
12540 MEnd = FinalOverriders.end();
12542 for (OverridingMethods::iterator SO = M->second.begin(),
12543 SOEnd = M->second.end();
12544 SO != SOEnd; ++SO) {
12545 assert(SO->second.size() > 0 &&
12546 "Virtual function without overridding functions?");
12547 if (SO->second.size() == 1)
12550 // C++ [class.virtual]p2:
12551 // In a derived class, if a virtual member function of a base
12552 // class subobject has more than one final overrider the
12553 // program is ill-formed.
12554 Diag(Record->getLocation(), diag::err_multiple_final_overriders)
12555 << (const NamedDecl *)M->first << Record;
12556 Diag(M->first->getLocation(),
12557 diag::note_overridden_virtual_function);
12558 for (OverridingMethods::overriding_iterator
12559 OM = SO->second.begin(),
12560 OMEnd = SO->second.end();
12562 Diag(OM->Method->getLocation(), diag::note_final_overrider)
12563 << (const NamedDecl *)M->first << OM->Method->getParent();
12565 Record->setInvalidDecl();
12568 CXXRecord->completeDefinition(&FinalOverriders);
12576 Record->completeDefinition();
12578 if (Record->hasAttrs()) {
12579 CheckAlignasUnderalignment(Record);
12581 if (const MSInheritanceAttr *IA = Record->getAttr<MSInheritanceAttr>())
12582 checkMSInheritanceAttrOnDefinition(cast<CXXRecordDecl>(Record),
12583 IA->getRange(), IA->getBestCase(),
12584 IA->getSemanticSpelling());
12587 // Check if the structure/union declaration is a type that can have zero
12588 // size in C. For C this is a language extension, for C++ it may cause
12589 // compatibility problems.
12590 bool CheckForZeroSize;
12591 if (!getLangOpts().CPlusPlus) {
12592 CheckForZeroSize = true;
12594 // For C++ filter out types that cannot be referenced in C code.
12595 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record);
12597 CXXRecord->getLexicalDeclContext()->isExternCContext() &&
12598 !CXXRecord->isDependentType() &&
12599 CXXRecord->isCLike();
12601 if (CheckForZeroSize) {
12602 bool ZeroSize = true;
12603 bool IsEmpty = true;
12604 unsigned NonBitFields = 0;
12605 for (RecordDecl::field_iterator I = Record->field_begin(),
12606 E = Record->field_end();
12607 (NonBitFields == 0 || ZeroSize) && I != E; ++I) {
12609 if (I->isUnnamedBitfield()) {
12610 if (I->getBitWidthValue(Context) > 0)
12614 QualType FieldType = I->getType();
12615 if (FieldType->isIncompleteType() ||
12616 !Context.getTypeSizeInChars(FieldType).isZero())
12621 // Empty structs are an extension in C (C99 6.7.2.1p7). They are
12622 // allowed in C++, but warn if its declaration is inside
12623 // extern "C" block.
12625 Diag(RecLoc, getLangOpts().CPlusPlus ?
12626 diag::warn_zero_size_struct_union_in_extern_c :
12627 diag::warn_zero_size_struct_union_compat)
12628 << IsEmpty << Record->isUnion() << (NonBitFields > 1);
12631 // Structs without named members are extension in C (C99 6.7.2.1p7),
12632 // but are accepted by GCC.
12633 if (NonBitFields == 0 && !getLangOpts().CPlusPlus) {
12634 Diag(RecLoc, IsEmpty ? diag::ext_empty_struct_union :
12635 diag::ext_no_named_members_in_struct_union)
12636 << Record->isUnion();
12640 ObjCIvarDecl **ClsFields =
12641 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
12642 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
12643 ID->setEndOfDefinitionLoc(RBrac);
12644 // Add ivar's to class's DeclContext.
12645 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
12646 ClsFields[i]->setLexicalDeclContext(ID);
12647 ID->addDecl(ClsFields[i]);
12649 // Must enforce the rule that ivars in the base classes may not be
12651 if (ID->getSuperClass())
12652 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
12653 } else if (ObjCImplementationDecl *IMPDecl =
12654 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
12655 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
12656 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
12657 // Ivar declared in @implementation never belongs to the implementation.
12658 // Only it is in implementation's lexical context.
12659 ClsFields[I]->setLexicalDeclContext(IMPDecl);
12660 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
12661 IMPDecl->setIvarLBraceLoc(LBrac);
12662 IMPDecl->setIvarRBraceLoc(RBrac);
12663 } else if (ObjCCategoryDecl *CDecl =
12664 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
12665 // case of ivars in class extension; all other cases have been
12666 // reported as errors elsewhere.
12667 // FIXME. Class extension does not have a LocEnd field.
12668 // CDecl->setLocEnd(RBrac);
12669 // Add ivar's to class extension's DeclContext.
12670 // Diagnose redeclaration of private ivars.
12671 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface();
12672 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
12674 if (const ObjCIvarDecl *ClsIvar =
12675 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
12676 Diag(ClsFields[i]->getLocation(),
12677 diag::err_duplicate_ivar_declaration);
12678 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
12681 for (const auto *Ext : IDecl->known_extensions()) {
12682 if (const ObjCIvarDecl *ClsExtIvar
12683 = Ext->getIvarDecl(ClsFields[i]->getIdentifier())) {
12684 Diag(ClsFields[i]->getLocation(),
12685 diag::err_duplicate_ivar_declaration);
12686 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition);
12691 ClsFields[i]->setLexicalDeclContext(CDecl);
12692 CDecl->addDecl(ClsFields[i]);
12694 CDecl->setIvarLBraceLoc(LBrac);
12695 CDecl->setIvarRBraceLoc(RBrac);
12700 ProcessDeclAttributeList(S, Record, Attr);
12703 /// \brief Determine whether the given integral value is representable within
12704 /// the given type T.
12705 static bool isRepresentableIntegerValue(ASTContext &Context,
12706 llvm::APSInt &Value,
12708 assert(T->isIntegralType(Context) && "Integral type required!");
12709 unsigned BitWidth = Context.getIntWidth(T);
12711 if (Value.isUnsigned() || Value.isNonNegative()) {
12712 if (T->isSignedIntegerOrEnumerationType())
12714 return Value.getActiveBits() <= BitWidth;
12716 return Value.getMinSignedBits() <= BitWidth;
12719 // \brief Given an integral type, return the next larger integral type
12720 // (or a NULL type of no such type exists).
12721 static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
12722 // FIXME: Int128/UInt128 support, which also needs to be introduced into
12723 // enum checking below.
12724 assert(T->isIntegralType(Context) && "Integral type required!");
12725 const unsigned NumTypes = 4;
12726 QualType SignedIntegralTypes[NumTypes] = {
12727 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
12729 QualType UnsignedIntegralTypes[NumTypes] = {
12730 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
12731 Context.UnsignedLongLongTy
12734 unsigned BitWidth = Context.getTypeSize(T);
12735 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
12736 : UnsignedIntegralTypes;
12737 for (unsigned I = 0; I != NumTypes; ++I)
12738 if (Context.getTypeSize(Types[I]) > BitWidth)
12744 EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
12745 EnumConstantDecl *LastEnumConst,
12746 SourceLocation IdLoc,
12747 IdentifierInfo *Id,
12749 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
12750 llvm::APSInt EnumVal(IntWidth);
12753 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
12757 Val = DefaultLvalueConversion(Val).get();
12760 if (Enum->isDependentType() || Val->isTypeDependent())
12761 EltTy = Context.DependentTy;
12763 SourceLocation ExpLoc;
12764 if (getLangOpts().CPlusPlus11 && Enum->isFixed() &&
12765 !getLangOpts().MSVCCompat) {
12766 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the
12767 // constant-expression in the enumerator-definition shall be a converted
12768 // constant expression of the underlying type.
12769 EltTy = Enum->getIntegerType();
12770 ExprResult Converted =
12771 CheckConvertedConstantExpression(Val, EltTy, EnumVal,
12773 if (Converted.isInvalid())
12776 Val = Converted.get();
12777 } else if (!Val->isValueDependent() &&
12778 !(Val = VerifyIntegerConstantExpression(Val,
12779 &EnumVal).get())) {
12780 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
12782 if (Enum->isFixed()) {
12783 EltTy = Enum->getIntegerType();
12785 // In Obj-C and Microsoft mode, require the enumeration value to be
12786 // representable in the underlying type of the enumeration. In C++11,
12787 // we perform a non-narrowing conversion as part of converted constant
12788 // expression checking.
12789 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
12790 if (getLangOpts().MSVCCompat) {
12791 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
12792 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).get();
12794 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy;
12796 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).get();
12797 } else if (getLangOpts().CPlusPlus) {
12798 // C++11 [dcl.enum]p5:
12799 // If the underlying type is not fixed, the type of each enumerator
12800 // is the type of its initializing value:
12801 // - If an initializer is specified for an enumerator, the
12802 // initializing value has the same type as the expression.
12803 EltTy = Val->getType();
12806 // The expression that defines the value of an enumeration constant
12807 // shall be an integer constant expression that has a value
12808 // representable as an int.
12810 // Complain if the value is not representable in an int.
12811 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
12812 Diag(IdLoc, diag::ext_enum_value_not_int)
12813 << EnumVal.toString(10) << Val->getSourceRange()
12814 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
12815 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
12816 // Force the type of the expression to 'int'.
12817 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).get();
12819 EltTy = Val->getType();
12826 if (Enum->isDependentType())
12827 EltTy = Context.DependentTy;
12828 else if (!LastEnumConst) {
12829 // C++0x [dcl.enum]p5:
12830 // If the underlying type is not fixed, the type of each enumerator
12831 // is the type of its initializing value:
12832 // - If no initializer is specified for the first enumerator, the
12833 // initializing value has an unspecified integral type.
12835 // GCC uses 'int' for its unspecified integral type, as does
12837 if (Enum->isFixed()) {
12838 EltTy = Enum->getIntegerType();
12841 EltTy = Context.IntTy;
12844 // Assign the last value + 1.
12845 EnumVal = LastEnumConst->getInitVal();
12847 EltTy = LastEnumConst->getType();
12849 // Check for overflow on increment.
12850 if (EnumVal < LastEnumConst->getInitVal()) {
12851 // C++0x [dcl.enum]p5:
12852 // If the underlying type is not fixed, the type of each enumerator
12853 // is the type of its initializing value:
12855 // - Otherwise the type of the initializing value is the same as
12856 // the type of the initializing value of the preceding enumerator
12857 // unless the incremented value is not representable in that type,
12858 // in which case the type is an unspecified integral type
12859 // sufficient to contain the incremented value. If no such type
12860 // exists, the program is ill-formed.
12861 QualType T = getNextLargerIntegralType(Context, EltTy);
12862 if (T.isNull() || Enum->isFixed()) {
12863 // There is no integral type larger enough to represent this
12864 // value. Complain, then allow the value to wrap around.
12865 EnumVal = LastEnumConst->getInitVal();
12866 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
12868 if (Enum->isFixed())
12869 // When the underlying type is fixed, this is ill-formed.
12870 Diag(IdLoc, diag::err_enumerator_wrapped)
12871 << EnumVal.toString(10)
12874 Diag(IdLoc, diag::ext_enumerator_increment_too_large)
12875 << EnumVal.toString(10);
12880 // Retrieve the last enumerator's value, extent that type to the
12881 // type that is supposed to be large enough to represent the incremented
12882 // value, then increment.
12883 EnumVal = LastEnumConst->getInitVal();
12884 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
12885 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
12888 // If we're not in C++, diagnose the overflow of enumerator values,
12889 // which in C99 means that the enumerator value is not representable in
12890 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
12891 // permits enumerator values that are representable in some larger
12893 if (!getLangOpts().CPlusPlus && !T.isNull())
12894 Diag(IdLoc, diag::warn_enum_value_overflow);
12895 } else if (!getLangOpts().CPlusPlus &&
12896 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
12897 // Enforce C99 6.7.2.2p2 even when we compute the next value.
12898 Diag(IdLoc, diag::ext_enum_value_not_int)
12899 << EnumVal.toString(10) << 1;
12904 if (!EltTy->isDependentType()) {
12905 // Make the enumerator value match the signedness and size of the
12906 // enumerator's type.
12907 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy));
12908 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
12911 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
12916 Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
12917 SourceLocation IdLoc, IdentifierInfo *Id,
12918 AttributeList *Attr,
12919 SourceLocation EqualLoc, Expr *Val) {
12920 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
12921 EnumConstantDecl *LastEnumConst =
12922 cast_or_null<EnumConstantDecl>(lastEnumConst);
12924 // The scope passed in may not be a decl scope. Zip up the scope tree until
12925 // we find one that is.
12926 S = getNonFieldDeclScope(S);
12928 // Verify that there isn't already something declared with this name in this
12930 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
12932 if (PrevDecl && PrevDecl->isTemplateParameter()) {
12933 // Maybe we will complain about the shadowed template parameter.
12934 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
12935 // Just pretend that we didn't see the previous declaration.
12936 PrevDecl = nullptr;
12940 // When in C++, we may get a TagDecl with the same name; in this case the
12941 // enum constant will 'hide' the tag.
12942 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
12943 "Received TagDecl when not in C++!");
12944 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
12945 if (isa<EnumConstantDecl>(PrevDecl))
12946 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
12948 Diag(IdLoc, diag::err_redefinition) << Id;
12949 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
12954 // C++ [class.mem]p15:
12955 // If T is the name of a class, then each of the following shall have a name
12956 // different from T:
12957 // - every enumerator of every member of class T that is an unscoped
12959 if (CXXRecordDecl *Record
12960 = dyn_cast<CXXRecordDecl>(
12961 TheEnumDecl->getDeclContext()->getRedeclContext()))
12962 if (!TheEnumDecl->isScoped() &&
12963 Record->getIdentifier() && Record->getIdentifier() == Id)
12964 Diag(IdLoc, diag::err_member_name_of_class) << Id;
12966 EnumConstantDecl *New =
12967 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
12970 // Process attributes.
12971 if (Attr) ProcessDeclAttributeList(S, New, Attr);
12973 // Register this decl in the current scope stack.
12974 New->setAccess(TheEnumDecl->getAccess());
12975 PushOnScopeChains(New, S);
12978 ActOnDocumentableDecl(New);
12983 // Returns true when the enum initial expression does not trigger the
12984 // duplicate enum warning. A few common cases are exempted as follows:
12985 // Element2 = Element1
12986 // Element2 = Element1 + 1
12987 // Element2 = Element1 - 1
12988 // Where Element2 and Element1 are from the same enum.
12989 static bool ValidDuplicateEnum(EnumConstantDecl *ECD, EnumDecl *Enum) {
12990 Expr *InitExpr = ECD->getInitExpr();
12993 InitExpr = InitExpr->IgnoreImpCasts();
12995 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(InitExpr)) {
12996 if (!BO->isAdditiveOp())
12998 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(BO->getRHS());
13001 if (IL->getValue() != 1)
13004 InitExpr = BO->getLHS();
13007 // This checks if the elements are from the same enum.
13008 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InitExpr);
13012 EnumConstantDecl *EnumConstant = dyn_cast<EnumConstantDecl>(DRE->getDecl());
13016 if (cast<EnumDecl>(TagDecl::castFromDeclContext(ECD->getDeclContext())) !=
13025 bool isTombstoneOrEmptyKey;
13026 DupKey(int64_t val, bool isTombstoneOrEmptyKey)
13027 : val(val), isTombstoneOrEmptyKey(isTombstoneOrEmptyKey) {}
13030 static DupKey GetDupKey(const llvm::APSInt& Val) {
13031 return DupKey(Val.isSigned() ? Val.getSExtValue() : Val.getZExtValue(),
13035 struct DenseMapInfoDupKey {
13036 static DupKey getEmptyKey() { return DupKey(0, true); }
13037 static DupKey getTombstoneKey() { return DupKey(1, true); }
13038 static unsigned getHashValue(const DupKey Key) {
13039 return (unsigned)(Key.val * 37);
13041 static bool isEqual(const DupKey& LHS, const DupKey& RHS) {
13042 return LHS.isTombstoneOrEmptyKey == RHS.isTombstoneOrEmptyKey &&
13043 LHS.val == RHS.val;
13047 // Emits a warning when an element is implicitly set a value that
13048 // a previous element has already been set to.
13049 static void CheckForDuplicateEnumValues(Sema &S, ArrayRef<Decl *> Elements,
13051 QualType EnumType) {
13052 if (S.Diags.isIgnored(diag::warn_duplicate_enum_values, Enum->getLocation()))
13054 // Avoid anonymous enums
13055 if (!Enum->getIdentifier())
13058 // Only check for small enums.
13059 if (Enum->getNumPositiveBits() > 63 || Enum->getNumNegativeBits() > 64)
13062 typedef SmallVector<EnumConstantDecl *, 3> ECDVector;
13063 typedef SmallVector<ECDVector *, 3> DuplicatesVector;
13065 typedef llvm::PointerUnion<EnumConstantDecl*, ECDVector*> DeclOrVector;
13066 typedef llvm::DenseMap<DupKey, DeclOrVector, DenseMapInfoDupKey>
13069 DuplicatesVector DupVector;
13070 ValueToVectorMap EnumMap;
13072 // Populate the EnumMap with all values represented by enum constants without
13074 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
13075 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
13077 // Null EnumConstantDecl means a previous diagnostic has been emitted for
13078 // this constant. Skip this enum since it may be ill-formed.
13083 if (ECD->getInitExpr())
13086 DupKey Key = GetDupKey(ECD->getInitVal());
13087 DeclOrVector &Entry = EnumMap[Key];
13089 // First time encountering this value.
13090 if (Entry.isNull())
13094 // Create vectors for any values that has duplicates.
13095 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
13096 EnumConstantDecl *ECD = cast<EnumConstantDecl>(Elements[i]);
13097 if (!ValidDuplicateEnum(ECD, Enum))
13100 DupKey Key = GetDupKey(ECD->getInitVal());
13102 DeclOrVector& Entry = EnumMap[Key];
13103 if (Entry.isNull())
13106 if (EnumConstantDecl *D = Entry.dyn_cast<EnumConstantDecl*>()) {
13107 // Ensure constants are different.
13111 // Create new vector and push values onto it.
13112 ECDVector *Vec = new ECDVector();
13114 Vec->push_back(ECD);
13116 // Update entry to point to the duplicates vector.
13119 // Store the vector somewhere we can consult later for quick emission of
13121 DupVector.push_back(Vec);
13125 ECDVector *Vec = Entry.get<ECDVector*>();
13126 // Make sure constants are not added more than once.
13127 if (*Vec->begin() == ECD)
13130 Vec->push_back(ECD);
13133 // Emit diagnostics.
13134 for (DuplicatesVector::iterator DupVectorIter = DupVector.begin(),
13135 DupVectorEnd = DupVector.end();
13136 DupVectorIter != DupVectorEnd; ++DupVectorIter) {
13137 ECDVector *Vec = *DupVectorIter;
13138 assert(Vec->size() > 1 && "ECDVector should have at least 2 elements.");
13140 // Emit warning for one enum constant.
13141 ECDVector::iterator I = Vec->begin();
13142 S.Diag((*I)->getLocation(), diag::warn_duplicate_enum_values)
13143 << (*I)->getName() << (*I)->getInitVal().toString(10)
13144 << (*I)->getSourceRange();
13147 // Emit one note for each of the remaining enum constants with
13149 for (ECDVector::iterator E = Vec->end(); I != E; ++I)
13150 S.Diag((*I)->getLocation(), diag::note_duplicate_element)
13151 << (*I)->getName() << (*I)->getInitVal().toString(10)
13152 << (*I)->getSourceRange();
13157 void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
13158 SourceLocation RBraceLoc, Decl *EnumDeclX,
13159 ArrayRef<Decl *> Elements,
13160 Scope *S, AttributeList *Attr) {
13161 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
13162 QualType EnumType = Context.getTypeDeclType(Enum);
13165 ProcessDeclAttributeList(S, Enum, Attr);
13167 if (Enum->isDependentType()) {
13168 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
13169 EnumConstantDecl *ECD =
13170 cast_or_null<EnumConstantDecl>(Elements[i]);
13171 if (!ECD) continue;
13173 ECD->setType(EnumType);
13176 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
13180 // TODO: If the result value doesn't fit in an int, it must be a long or long
13181 // long value. ISO C does not support this, but GCC does as an extension,
13183 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
13184 unsigned CharWidth = Context.getTargetInfo().getCharWidth();
13185 unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
13187 // Verify that all the values are okay, compute the size of the values, and
13188 // reverse the list.
13189 unsigned NumNegativeBits = 0;
13190 unsigned NumPositiveBits = 0;
13192 // Keep track of whether all elements have type int.
13193 bool AllElementsInt = true;
13195 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
13196 EnumConstantDecl *ECD =
13197 cast_or_null<EnumConstantDecl>(Elements[i]);
13198 if (!ECD) continue; // Already issued a diagnostic.
13200 const llvm::APSInt &InitVal = ECD->getInitVal();
13202 // Keep track of the size of positive and negative values.
13203 if (InitVal.isUnsigned() || InitVal.isNonNegative())
13204 NumPositiveBits = std::max(NumPositiveBits,
13205 (unsigned)InitVal.getActiveBits());
13207 NumNegativeBits = std::max(NumNegativeBits,
13208 (unsigned)InitVal.getMinSignedBits());
13210 // Keep track of whether every enum element has type int (very commmon).
13211 if (AllElementsInt)
13212 AllElementsInt = ECD->getType() == Context.IntTy;
13215 // Figure out the type that should be used for this enum.
13217 unsigned BestWidth;
13219 // C++0x N3000 [conv.prom]p3:
13220 // An rvalue of an unscoped enumeration type whose underlying
13221 // type is not fixed can be converted to an rvalue of the first
13222 // of the following types that can represent all the values of
13223 // the enumeration: int, unsigned int, long int, unsigned long
13224 // int, long long int, or unsigned long long int.
13226 // An identifier declared as an enumeration constant has type int.
13227 // The C99 rule is modified by a gcc extension
13228 QualType BestPromotionType;
13230 bool Packed = Enum->hasAttr<PackedAttr>();
13231 // -fshort-enums is the equivalent to specifying the packed attribute on all
13232 // enum definitions.
13233 if (LangOpts.ShortEnums)
13236 if (Enum->isFixed()) {
13237 BestType = Enum->getIntegerType();
13238 if (BestType->isPromotableIntegerType())
13239 BestPromotionType = Context.getPromotedIntegerType(BestType);
13241 BestPromotionType = BestType;
13242 // We don't need to set BestWidth, because BestType is going to be the type
13243 // of the enumerators, but we do anyway because otherwise some compilers
13244 // warn that it might be used uninitialized.
13245 BestWidth = CharWidth;
13247 else if (NumNegativeBits) {
13248 // If there is a negative value, figure out the smallest integer type (of
13249 // int/long/longlong) that fits.
13250 // If it's packed, check also if it fits a char or a short.
13251 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
13252 BestType = Context.SignedCharTy;
13253 BestWidth = CharWidth;
13254 } else if (Packed && NumNegativeBits <= ShortWidth &&
13255 NumPositiveBits < ShortWidth) {
13256 BestType = Context.ShortTy;
13257 BestWidth = ShortWidth;
13258 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
13259 BestType = Context.IntTy;
13260 BestWidth = IntWidth;
13262 BestWidth = Context.getTargetInfo().getLongWidth();
13264 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
13265 BestType = Context.LongTy;
13267 BestWidth = Context.getTargetInfo().getLongLongWidth();
13269 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
13270 Diag(Enum->getLocation(), diag::ext_enum_too_large);
13271 BestType = Context.LongLongTy;
13274 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
13276 // If there is no negative value, figure out the smallest type that fits
13277 // all of the enumerator values.
13278 // If it's packed, check also if it fits a char or a short.
13279 if (Packed && NumPositiveBits <= CharWidth) {
13280 BestType = Context.UnsignedCharTy;
13281 BestPromotionType = Context.IntTy;
13282 BestWidth = CharWidth;
13283 } else if (Packed && NumPositiveBits <= ShortWidth) {
13284 BestType = Context.UnsignedShortTy;
13285 BestPromotionType = Context.IntTy;
13286 BestWidth = ShortWidth;
13287 } else if (NumPositiveBits <= IntWidth) {
13288 BestType = Context.UnsignedIntTy;
13289 BestWidth = IntWidth;
13291 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
13292 ? Context.UnsignedIntTy : Context.IntTy;
13293 } else if (NumPositiveBits <=
13294 (BestWidth = Context.getTargetInfo().getLongWidth())) {
13295 BestType = Context.UnsignedLongTy;
13297 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
13298 ? Context.UnsignedLongTy : Context.LongTy;
13300 BestWidth = Context.getTargetInfo().getLongLongWidth();
13301 assert(NumPositiveBits <= BestWidth &&
13302 "How could an initializer get larger than ULL?");
13303 BestType = Context.UnsignedLongLongTy;
13305 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
13306 ? Context.UnsignedLongLongTy : Context.LongLongTy;
13310 // Loop over all of the enumerator constants, changing their types to match
13311 // the type of the enum if needed.
13312 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
13313 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
13314 if (!ECD) continue; // Already issued a diagnostic.
13316 // Standard C says the enumerators have int type, but we allow, as an
13317 // extension, the enumerators to be larger than int size. If each
13318 // enumerator value fits in an int, type it as an int, otherwise type it the
13319 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
13320 // that X has type 'int', not 'unsigned'.
13322 // Determine whether the value fits into an int.
13323 llvm::APSInt InitVal = ECD->getInitVal();
13325 // If it fits into an integer type, force it. Otherwise force it to match
13326 // the enum decl type.
13330 if (!getLangOpts().CPlusPlus &&
13331 !Enum->isFixed() &&
13332 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
13333 NewTy = Context.IntTy;
13334 NewWidth = IntWidth;
13336 } else if (ECD->getType() == BestType) {
13337 // Already the right type!
13338 if (getLangOpts().CPlusPlus)
13339 // C++ [dcl.enum]p4: Following the closing brace of an
13340 // enum-specifier, each enumerator has the type of its
13342 ECD->setType(EnumType);
13346 NewWidth = BestWidth;
13347 NewSign = BestType->isSignedIntegerOrEnumerationType();
13350 // Adjust the APSInt value.
13351 InitVal = InitVal.extOrTrunc(NewWidth);
13352 InitVal.setIsSigned(NewSign);
13353 ECD->setInitVal(InitVal);
13355 // Adjust the Expr initializer and type.
13356 if (ECD->getInitExpr() &&
13357 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
13358 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
13360 ECD->getInitExpr(),
13361 /*base paths*/ nullptr,
13363 if (getLangOpts().CPlusPlus)
13364 // C++ [dcl.enum]p4: Following the closing brace of an
13365 // enum-specifier, each enumerator has the type of its
13367 ECD->setType(EnumType);
13369 ECD->setType(NewTy);
13372 Enum->completeDefinition(BestType, BestPromotionType,
13373 NumPositiveBits, NumNegativeBits);
13375 CheckForDuplicateEnumValues(*this, Elements, Enum, EnumType);
13377 // Now that the enum type is defined, ensure it's not been underaligned.
13378 if (Enum->hasAttrs())
13379 CheckAlignasUnderalignment(Enum);
13382 Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
13383 SourceLocation StartLoc,
13384 SourceLocation EndLoc) {
13385 StringLiteral *AsmString = cast<StringLiteral>(expr);
13387 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
13388 AsmString, StartLoc,
13390 CurContext->addDecl(New);
13394 static void checkModuleImportContext(Sema &S, Module *M,
13395 SourceLocation ImportLoc,
13397 if (auto *LSD = dyn_cast<LinkageSpecDecl>(DC)) {
13398 switch (LSD->getLanguage()) {
13399 case LinkageSpecDecl::lang_c:
13400 if (!M->IsExternC) {
13401 S.Diag(ImportLoc, diag::err_module_import_in_extern_c)
13402 << M->getFullModuleName();
13403 S.Diag(LSD->getLocStart(), diag::note_module_import_in_extern_c);
13407 case LinkageSpecDecl::lang_cxx:
13410 DC = LSD->getParent();
13413 while (isa<LinkageSpecDecl>(DC))
13414 DC = DC->getParent();
13415 if (!isa<TranslationUnitDecl>(DC)) {
13416 S.Diag(ImportLoc, diag::err_module_import_not_at_top_level)
13417 << M->getFullModuleName() << DC;
13418 S.Diag(cast<Decl>(DC)->getLocStart(),
13419 diag::note_module_import_not_at_top_level)
13424 DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc,
13425 SourceLocation ImportLoc,
13426 ModuleIdPath Path) {
13428 getModuleLoader().loadModule(ImportLoc, Path, Module::AllVisible,
13429 /*IsIncludeDirective=*/false);
13433 checkModuleImportContext(*this, Mod, ImportLoc, CurContext);
13435 // FIXME: we should support importing a submodule within a different submodule
13436 // of the same top-level module. Until we do, make it an error rather than
13437 // silently ignoring the import.
13438 if (Mod->getTopLevelModuleName() == getLangOpts().CurrentModule)
13439 Diag(ImportLoc, diag::err_module_self_import)
13440 << Mod->getFullModuleName() << getLangOpts().CurrentModule;
13442 SmallVector<SourceLocation, 2> IdentifierLocs;
13443 Module *ModCheck = Mod;
13444 for (unsigned I = 0, N = Path.size(); I != N; ++I) {
13445 // If we've run out of module parents, just drop the remaining identifiers.
13446 // We need the length to be consistent.
13449 ModCheck = ModCheck->Parent;
13451 IdentifierLocs.push_back(Path[I].second);
13454 ImportDecl *Import = ImportDecl::Create(Context,
13455 Context.getTranslationUnitDecl(),
13456 AtLoc.isValid()? AtLoc : ImportLoc,
13457 Mod, IdentifierLocs);
13458 Context.getTranslationUnitDecl()->addDecl(Import);
13462 void Sema::ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod) {
13463 checkModuleImportContext(*this, Mod, DirectiveLoc, CurContext);
13465 // FIXME: Should we synthesize an ImportDecl here?
13466 getModuleLoader().makeModuleVisible(Mod, Module::AllVisible, DirectiveLoc,
13467 /*Complain=*/true);
13470 void Sema::createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
13472 // Bail if we're not allowed to implicitly import a module here.
13473 if (isSFINAEContext() || !getLangOpts().ModulesErrorRecovery)
13476 // Create the implicit import declaration.
13477 TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
13478 ImportDecl *ImportD = ImportDecl::CreateImplicit(getASTContext(), TU,
13480 TU->addDecl(ImportD);
13481 Consumer.HandleImplicitImportDecl(ImportD);
13483 // Make the module visible.
13484 getModuleLoader().makeModuleVisible(Mod, Module::AllVisible, Loc,
13485 /*Complain=*/false);
13488 void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
13489 IdentifierInfo* AliasName,
13490 SourceLocation PragmaLoc,
13491 SourceLocation NameLoc,
13492 SourceLocation AliasNameLoc) {
13493 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
13494 LookupOrdinaryName);
13495 AsmLabelAttr *Attr = ::new (Context) AsmLabelAttr(AliasNameLoc, Context,
13496 AliasName->getName(), 0);
13499 PrevDecl->addAttr(Attr);
13501 (void)ExtnameUndeclaredIdentifiers.insert(
13502 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr));
13505 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
13506 SourceLocation PragmaLoc,
13507 SourceLocation NameLoc) {
13508 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
13511 PrevDecl->addAttr(WeakAttr::CreateImplicit(Context, PragmaLoc));
13513 (void)WeakUndeclaredIdentifiers.insert(
13514 std::pair<IdentifierInfo*,WeakInfo>
13515 (Name, WeakInfo((IdentifierInfo*)nullptr, NameLoc)));
13519 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
13520 IdentifierInfo* AliasName,
13521 SourceLocation PragmaLoc,
13522 SourceLocation NameLoc,
13523 SourceLocation AliasNameLoc) {
13524 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
13525 LookupOrdinaryName);
13526 WeakInfo W = WeakInfo(Name, NameLoc);
13529 if (!PrevDecl->hasAttr<AliasAttr>())
13530 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
13531 DeclApplyPragmaWeak(TUScope, ND, W);
13533 (void)WeakUndeclaredIdentifiers.insert(
13534 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
13538 Decl *Sema::getObjCDeclContext() const {
13539 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));
13542 AvailabilityResult Sema::getCurContextAvailability() const {
13543 const Decl *D = cast<Decl>(getCurObjCLexicalContext());
13544 // If we are within an Objective-C method, we should consult
13545 // both the availability of the method as well as the
13546 // enclosing class. If the class is (say) deprecated,
13547 // the entire method is considered deprecated from the
13548 // purpose of checking if the current context is deprecated.
13549 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
13550 AvailabilityResult R = MD->getAvailability();
13551 if (R != AR_Available)
13553 D = MD->getClassInterface();
13555 // If we are within an Objective-c @implementation, it
13556 // gets the same availability context as the @interface.
13557 else if (const ObjCImplementationDecl *ID =
13558 dyn_cast<ObjCImplementationDecl>(D)) {
13559 D = ID->getClassInterface();
13561 return D->getAvailability();