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/CXXInheritance.h"
19 #include "clang/AST/CharUnits.h"
20 #include "clang/AST/CommentDiagnostic.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/DeclTemplate.h"
24 #include "clang/AST/EvaluatedExprVisitor.h"
25 #include "clang/AST/ExprCXX.h"
26 #include "clang/AST/StmtCXX.h"
27 #include "clang/Basic/PartialDiagnostic.h"
28 #include "clang/Basic/SourceManager.h"
29 #include "clang/Basic/TargetInfo.h"
30 #include "clang/Lex/HeaderSearch.h" // FIXME: Sema shouldn't depend on Lex
31 #include "clang/Lex/ModuleLoader.h" // FIXME: Sema shouldn't depend on Lex
32 #include "clang/Lex/Preprocessor.h" // FIXME: Sema shouldn't depend on Lex
33 #include "clang/Parse/ParseDiagnostic.h"
34 #include "clang/Sema/CXXFieldCollector.h"
35 #include "clang/Sema/DeclSpec.h"
36 #include "clang/Sema/DelayedDiagnostic.h"
37 #include "clang/Sema/Initialization.h"
38 #include "clang/Sema/Lookup.h"
39 #include "clang/Sema/ParsedTemplate.h"
40 #include "clang/Sema/Scope.h"
41 #include "clang/Sema/ScopeInfo.h"
42 #include "llvm/ADT/SmallString.h"
43 #include "llvm/ADT/Triple.h"
47 using namespace clang;
50 Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) {
52 Decl *Group[2] = { OwnedType, Ptr };
53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2));
56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
61 class TypeNameValidatorCCC : public CorrectionCandidateCallback {
63 TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false)
64 : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass) {
65 WantExpressionKeywords = false;
66 WantCXXNamedCasts = false;
67 WantRemainingKeywords = false;
70 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
71 if (NamedDecl *ND = candidate.getCorrectionDecl())
72 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) &&
73 (AllowInvalidDecl || !ND->isInvalidDecl());
75 return !WantClassName && candidate.isKeyword();
79 bool AllowInvalidDecl;
85 /// \brief Determine whether the token kind starts a simple-type-specifier.
86 bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const {
88 // FIXME: Take into account the current language when deciding whether a
89 // token kind is a valid type specifier
93 case tok::kw___int128:
95 case tok::kw_unsigned:
102 case tok::kw_wchar_t:
104 case tok::kw___underlying_type:
107 case tok::annot_typename:
108 case tok::kw_char16_t:
109 case tok::kw_char32_t:
111 case tok::kw_decltype:
112 return getLangOpts().CPlusPlus;
121 /// \brief If the identifier refers to a type name within this scope,
122 /// return the declaration of that type.
124 /// This routine performs ordinary name lookup of the identifier II
125 /// within the given scope, with optional C++ scope specifier SS, to
126 /// determine whether the name refers to a type. If so, returns an
127 /// opaque pointer (actually a QualType) corresponding to that
128 /// type. Otherwise, returns NULL.
130 /// If name lookup results in an ambiguity, this routine will complain
131 /// and then return NULL.
132 ParsedType Sema::getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
133 Scope *S, CXXScopeSpec *SS,
134 bool isClassName, bool HasTrailingDot,
135 ParsedType ObjectTypePtr,
136 bool IsCtorOrDtorName,
137 bool WantNontrivialTypeSourceInfo,
138 IdentifierInfo **CorrectedII) {
139 // Determine where we will perform name lookup.
140 DeclContext *LookupCtx = 0;
142 QualType ObjectType = ObjectTypePtr.get();
143 if (ObjectType->isRecordType())
144 LookupCtx = computeDeclContext(ObjectType);
145 } else if (SS && SS->isNotEmpty()) {
146 LookupCtx = computeDeclContext(*SS, false);
149 if (isDependentScopeSpecifier(*SS)) {
151 // A qualified-id that refers to a type and in which the
152 // nested-name-specifier depends on a template-parameter (14.6.2)
153 // shall be prefixed by the keyword typename to indicate that the
154 // qualified-id denotes a type, forming an
155 // elaborated-type-specifier (7.1.5.3).
157 // We therefore do not perform any name lookup if the result would
158 // refer to a member of an unknown specialization.
159 if (!isClassName && !IsCtorOrDtorName)
162 // We know from the grammar that this name refers to a type,
163 // so build a dependent node to describe the type.
164 if (WantNontrivialTypeSourceInfo)
165 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
167 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
169 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
172 return ParsedType::make(T);
178 if (!LookupCtx->isDependentContext() &&
179 RequireCompleteDeclContext(*SS, LookupCtx))
183 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
184 // lookup for class-names.
185 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
187 LookupResult Result(*this, &II, NameLoc, Kind);
189 // Perform "qualified" name lookup into the declaration context we
190 // computed, which is either the type of the base of a member access
191 // expression or the declaration context associated with a prior
192 // nested-name-specifier.
193 LookupQualifiedName(Result, LookupCtx);
195 if (ObjectTypePtr && Result.empty()) {
196 // C++ [basic.lookup.classref]p3:
197 // If the unqualified-id is ~type-name, the type-name is looked up
198 // in the context of the entire postfix-expression. If the type T of
199 // the object expression is of a class type C, the type-name is also
200 // looked up in the scope of class C. At least one of the lookups shall
201 // find a name that refers to (possibly cv-qualified) T.
202 LookupName(Result, S);
205 // Perform unqualified name lookup.
206 LookupName(Result, S);
209 NamedDecl *IIDecl = 0;
210 switch (Result.getResultKind()) {
211 case LookupResult::NotFound:
212 case LookupResult::NotFoundInCurrentInstantiation:
214 TypeNameValidatorCCC Validator(true, isClassName);
215 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(),
216 Kind, S, SS, Validator);
217 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
219 bool MemberOfUnknownSpecialization;
220 UnqualifiedId TemplateName;
221 TemplateName.setIdentifier(NewII, NameLoc);
222 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
223 CXXScopeSpec NewSS, *NewSSPtr = SS;
225 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
228 if (Correction && (NNS || NewII != &II) &&
229 // Ignore a correction to a template type as the to-be-corrected
230 // identifier is not a template (typo correction for template names
231 // is handled elsewhere).
232 !(getLangOpts().CPlusPlus && NewSSPtr &&
233 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(),
234 false, Template, MemberOfUnknownSpecialization))) {
235 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
236 isClassName, HasTrailingDot, ObjectTypePtr,
238 WantNontrivialTypeSourceInfo);
240 std::string CorrectedStr(Correction.getAsString(getLangOpts()));
241 std::string CorrectedQuotedStr(
242 Correction.getQuoted(getLangOpts()));
243 Diag(NameLoc, diag::err_unknown_type_or_class_name_suggest)
244 << Result.getLookupName() << CorrectedQuotedStr << isClassName
245 << FixItHint::CreateReplacement(SourceRange(NameLoc),
247 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl())
248 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
249 << CorrectedQuotedStr;
252 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
253 *CorrectedII = NewII;
258 // If typo correction failed or was not performed, fall through
259 case LookupResult::FoundOverloaded:
260 case LookupResult::FoundUnresolvedValue:
261 Result.suppressDiagnostics();
264 case LookupResult::Ambiguous:
265 // Recover from type-hiding ambiguities by hiding the type. We'll
266 // do the lookup again when looking for an object, and we can
267 // diagnose the error then. If we don't do this, then the error
268 // about hiding the type will be immediately followed by an error
269 // that only makes sense if the identifier was treated like a type.
270 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
271 Result.suppressDiagnostics();
275 // Look to see if we have a type anywhere in the list of results.
276 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
277 Res != ResEnd; ++Res) {
278 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
280 (*Res)->getLocation().getRawEncoding() <
281 IIDecl->getLocation().getRawEncoding())
287 // None of the entities we found is a type, so there is no way
288 // to even assume that the result is a type. In this case, don't
289 // complain about the ambiguity. The parser will either try to
290 // perform this lookup again (e.g., as an object name), which
291 // will produce the ambiguity, or will complain that it expected
293 Result.suppressDiagnostics();
297 // We found a type within the ambiguous lookup; diagnose the
298 // ambiguity and then return that type. This might be the right
299 // answer, or it might not be, but it suppresses any attempt to
300 // perform the name lookup again.
303 case LookupResult::Found:
304 IIDecl = Result.getFoundDecl();
308 assert(IIDecl && "Didn't find decl");
311 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
312 DiagnoseUseOfDecl(IIDecl, NameLoc);
315 T = Context.getTypeDeclType(TD);
317 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a
318 // constructor or destructor name (in such a case, the scope specifier
319 // will be attached to the enclosing Expr or Decl node).
320 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) {
321 if (WantNontrivialTypeSourceInfo) {
322 // Construct a type with type-source information.
323 TypeLocBuilder Builder;
324 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
326 T = getElaboratedType(ETK_None, *SS, T);
327 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
328 ElabTL.setElaboratedKeywordLoc(SourceLocation());
329 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
330 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
332 T = getElaboratedType(ETK_None, *SS, T);
335 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
336 (void)DiagnoseUseOfDecl(IDecl, NameLoc);
338 T = Context.getObjCInterfaceType(IDecl);
342 // If it's not plausibly a type, suppress diagnostics.
343 Result.suppressDiagnostics();
346 return ParsedType::make(T);
349 /// isTagName() - This method is called *for error recovery purposes only*
350 /// to determine if the specified name is a valid tag name ("struct foo"). If
351 /// so, this returns the TST for the tag corresponding to it (TST_enum,
352 /// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose
353 /// cases in C where the user forgot to specify the tag.
354 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
355 // Do a tag name lookup in this scope.
356 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
357 LookupName(R, S, false);
358 R.suppressDiagnostics();
359 if (R.getResultKind() == LookupResult::Found)
360 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
361 switch (TD->getTagKind()) {
362 case TTK_Struct: return DeclSpec::TST_struct;
363 case TTK_Interface: return DeclSpec::TST_interface;
364 case TTK_Union: return DeclSpec::TST_union;
365 case TTK_Class: return DeclSpec::TST_class;
366 case TTK_Enum: return DeclSpec::TST_enum;
370 return DeclSpec::TST_unspecified;
373 /// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
374 /// if a CXXScopeSpec's type is equal to the type of one of the base classes
375 /// then downgrade the missing typename error to a warning.
376 /// This is needed for MSVC compatibility; Example:
378 /// template<class T> class A {
380 /// typedef int TYPE;
382 /// template<class T> class B : public A<T> {
384 /// A<T>::TYPE a; // no typename required because A<T> is a base class.
387 bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
388 if (CurContext->isRecord()) {
389 const Type *Ty = SS->getScopeRep()->getAsType();
391 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
392 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
393 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base)
394 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType()))
396 return S->isFunctionPrototypeScope();
398 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
401 bool Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
402 SourceLocation IILoc,
405 ParsedType &SuggestedType) {
406 // We don't have anything to suggest (yet).
407 SuggestedType = ParsedType();
409 // There may have been a typo in the name of the type. Look up typo
410 // results, in case we have something that we can suggest.
411 TypeNameValidatorCCC Validator(false);
412 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(II, IILoc),
413 LookupOrdinaryName, S, SS,
415 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
416 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
418 if (Corrected.isKeyword()) {
419 // We corrected to a keyword.
420 IdentifierInfo *NewII = Corrected.getCorrectionAsIdentifierInfo();
421 if (!isSimpleTypeSpecifier(NewII->getTokenID()))
422 CorrectedQuotedStr = "the keyword " + CorrectedQuotedStr;
423 Diag(IILoc, diag::err_unknown_typename_suggest)
424 << II << CorrectedQuotedStr
425 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
428 NamedDecl *Result = Corrected.getCorrectionDecl();
429 // We found a similarly-named type or interface; suggest that.
430 if (!SS || !SS->isSet())
431 Diag(IILoc, diag::err_unknown_typename_suggest)
432 << II << CorrectedQuotedStr
433 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
434 else if (DeclContext *DC = computeDeclContext(*SS, false))
435 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
436 << II << DC << CorrectedQuotedStr << SS->getRange()
437 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
440 llvm_unreachable("could not have corrected a typo here");
442 Diag(Result->getLocation(), diag::note_previous_decl)
443 << CorrectedQuotedStr;
445 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS,
446 false, false, ParsedType(),
447 /*IsCtorOrDtorName=*/false,
448 /*NonTrivialTypeSourceInfo=*/true);
453 if (getLangOpts().CPlusPlus) {
454 // See if II is a class template that the user forgot to pass arguments to.
456 Name.setIdentifier(II, IILoc);
457 CXXScopeSpec EmptySS;
458 TemplateTy TemplateResult;
459 bool MemberOfUnknownSpecialization;
460 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
461 Name, ParsedType(), true, TemplateResult,
462 MemberOfUnknownSpecialization) == TNK_Type_template) {
463 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
464 Diag(IILoc, diag::err_template_missing_args) << TplName;
465 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
466 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
467 << TplDecl->getTemplateParameters()->getSourceRange();
473 // FIXME: Should we move the logic that tries to recover from a missing tag
474 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
476 if (!SS || (!SS->isSet() && !SS->isInvalid()))
477 Diag(IILoc, diag::err_unknown_typename) << II;
478 else if (DeclContext *DC = computeDeclContext(*SS, false))
479 Diag(IILoc, diag::err_typename_nested_not_found)
480 << II << DC << SS->getRange();
481 else if (isDependentScopeSpecifier(*SS)) {
482 unsigned DiagID = diag::err_typename_missing;
483 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S))
484 DiagID = diag::warn_typename_missing;
486 Diag(SS->getRange().getBegin(), DiagID)
487 << (NestedNameSpecifier *)SS->getScopeRep() << II->getName()
488 << SourceRange(SS->getRange().getBegin(), IILoc)
489 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
490 SuggestedType = ActOnTypenameType(S, SourceLocation(),
491 *SS, *II, IILoc).get();
493 assert(SS && SS->isInvalid() &&
494 "Invalid scope specifier has already been diagnosed");
500 /// \brief Determine whether the given result set contains either a type name
502 static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
503 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus &&
504 NextToken.is(tok::less);
506 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
507 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
510 if (CheckTemplate && isa<TemplateDecl>(*I))
517 static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result,
518 Scope *S, CXXScopeSpec &SS,
519 IdentifierInfo *&Name,
520 SourceLocation NameLoc) {
521 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName);
522 SemaRef.LookupParsedName(R, S, &SS);
523 if (TagDecl *Tag = R.getAsSingle<TagDecl>()) {
524 const char *TagName = 0;
525 const char *FixItTagName = 0;
526 switch (Tag->getTagKind()) {
529 FixItTagName = "class ";
534 FixItTagName = "enum ";
539 FixItTagName = "struct ";
543 TagName = "__interface";
544 FixItTagName = "__interface ";
549 FixItTagName = "union ";
553 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
554 << Name << TagName << SemaRef.getLangOpts().CPlusPlus
555 << FixItHint::CreateInsertion(NameLoc, FixItTagName);
557 for (LookupResult::iterator I = Result.begin(), IEnd = Result.end();
559 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
562 // Replace lookup results with just the tag decl.
563 Result.clear(Sema::LookupTagName);
564 SemaRef.LookupParsedName(Result, S, &SS);
571 /// Build a ParsedType for a simple-type-specifier with a nested-name-specifier.
572 static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS,
573 QualType T, SourceLocation NameLoc) {
574 ASTContext &Context = S.Context;
576 TypeLocBuilder Builder;
577 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
579 T = S.getElaboratedType(ETK_None, SS, T);
580 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
581 ElabTL.setElaboratedKeywordLoc(SourceLocation());
582 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
583 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
586 Sema::NameClassification Sema::ClassifyName(Scope *S,
588 IdentifierInfo *&Name,
589 SourceLocation NameLoc,
590 const Token &NextToken,
591 bool IsAddressOfOperand,
592 CorrectionCandidateCallback *CCC) {
593 DeclarationNameInfo NameInfo(Name, NameLoc);
594 ObjCMethodDecl *CurMethod = getCurMethodDecl();
596 if (NextToken.is(tok::coloncolon)) {
597 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(),
598 QualType(), false, SS, 0, false);
602 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
603 LookupParsedName(Result, S, &SS, !CurMethod);
605 // Perform lookup for Objective-C instance variables (including automatically
606 // synthesized instance variables), if we're in an Objective-C method.
607 // FIXME: This lookup really, really needs to be folded in to the normal
608 // unqualified lookup mechanism.
609 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
610 ExprResult E = LookupInObjCMethod(Result, S, Name, true);
611 if (E.get() || E.isInvalid())
615 bool SecondTry = false;
616 bool IsFilteredTemplateName = false;
619 switch (Result.getResultKind()) {
620 case LookupResult::NotFound:
621 // If an unqualified-id is followed by a '(', then we have a function
623 if (!SS.isSet() && NextToken.is(tok::l_paren)) {
624 // In C++, this is an ADL-only call.
626 if (getLangOpts().CPlusPlus)
627 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
630 // If the expression that precedes the parenthesized argument list in a
631 // function call consists solely of an identifier, and if no
632 // declaration is visible for this identifier, the identifier is
633 // implicitly declared exactly as if, in the innermost block containing
634 // the function call, the declaration
636 // extern int identifier ();
640 // We also allow this in C99 as an extension.
641 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
643 Result.resolveKind();
644 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
648 // In C, we first see whether there is a tag type by the same name, in
649 // which case it's likely that the user just forget to write "enum",
650 // "struct", or "union".
651 if (!getLangOpts().CPlusPlus && !SecondTry &&
652 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
656 // Perform typo correction to determine if there is another name that is
657 // close to this name.
658 if (!SecondTry && CCC) {
660 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
661 Result.getLookupKind(), S,
663 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
664 unsigned QualifiedDiag = diag::err_no_member_suggest;
665 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
666 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts()));
668 NamedDecl *FirstDecl = Corrected.getCorrectionDecl();
669 NamedDecl *UnderlyingFirstDecl
670 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0;
671 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
672 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
673 UnqualifiedDiag = diag::err_no_template_suggest;
674 QualifiedDiag = diag::err_no_member_template_suggest;
675 } else if (UnderlyingFirstDecl &&
676 (isa<TypeDecl>(UnderlyingFirstDecl) ||
677 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
678 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
679 UnqualifiedDiag = diag::err_unknown_typename_suggest;
680 QualifiedDiag = diag::err_unknown_nested_typename_suggest;
684 Diag(NameLoc, UnqualifiedDiag)
685 << Name << CorrectedQuotedStr
686 << FixItHint::CreateReplacement(NameLoc, CorrectedStr);
687 else // FIXME: is this even reachable? Test it.
688 Diag(NameLoc, QualifiedDiag)
689 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
691 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(),
694 // Update the name, so that the caller has the new name.
695 Name = Corrected.getCorrectionAsIdentifierInfo();
697 // Typo correction corrected to a keyword.
698 if (Corrected.isKeyword())
699 return Corrected.getCorrectionAsIdentifierInfo();
701 // Also update the LookupResult...
702 // FIXME: This should probably go away at some point
704 Result.setLookupName(Corrected.getCorrection());
706 Result.addDecl(FirstDecl);
707 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
708 << CorrectedQuotedStr;
711 // If we found an Objective-C instance variable, let
712 // LookupInObjCMethod build the appropriate expression to
713 // reference the ivar.
714 // FIXME: This is a gross hack.
715 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
717 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
725 // We failed to correct; just fall through and let the parser deal with it.
726 Result.suppressDiagnostics();
727 return NameClassification::Unknown();
729 case LookupResult::NotFoundInCurrentInstantiation: {
730 // We performed name lookup into the current instantiation, and there were
731 // dependent bases, so we treat this result the same way as any other
732 // dependent nested-name-specifier.
735 // A name used in a template declaration or definition and that is
736 // dependent on a template-parameter is assumed not to name a type
737 // unless the applicable name lookup finds a type name or the name is
738 // qualified by the keyword typename.
740 // FIXME: If the next token is '<', we might want to ask the parser to
741 // perform some heroics to see if we actually have a
742 // template-argument-list, which would indicate a missing 'template'
744 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(),
745 NameInfo, IsAddressOfOperand,
749 case LookupResult::Found:
750 case LookupResult::FoundOverloaded:
751 case LookupResult::FoundUnresolvedValue:
754 case LookupResult::Ambiguous:
755 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
756 hasAnyAcceptableTemplateNames(Result)) {
757 // C++ [temp.local]p3:
758 // A lookup that finds an injected-class-name (10.2) can result in an
759 // ambiguity in certain cases (for example, if it is found in more than
760 // one base class). If all of the injected-class-names that are found
761 // refer to specializations of the same class template, and if the name
762 // is followed by a template-argument-list, the reference refers to the
763 // class template itself and not a specialization thereof, and is not
766 // This filtering can make an ambiguous result into an unambiguous one,
767 // so try again after filtering out template names.
768 FilterAcceptableTemplateNames(Result);
769 if (!Result.isAmbiguous()) {
770 IsFilteredTemplateName = true;
775 // Diagnose the ambiguity and return an error.
776 return NameClassification::Error();
779 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
780 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
781 // C++ [temp.names]p3:
782 // After name lookup (3.4) finds that a name is a template-name or that
783 // an operator-function-id or a literal- operator-id refers to a set of
784 // overloaded functions any member of which is a function template if
785 // this is followed by a <, the < is always taken as the delimiter of a
786 // template-argument-list and never as the less-than operator.
787 if (!IsFilteredTemplateName)
788 FilterAcceptableTemplateNames(Result);
790 if (!Result.empty()) {
791 bool IsFunctionTemplate;
792 TemplateName Template;
793 if (Result.end() - Result.begin() > 1) {
794 IsFunctionTemplate = true;
795 Template = Context.getOverloadedTemplateName(Result.begin(),
799 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
800 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
802 if (SS.isSet() && !SS.isInvalid())
803 Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
804 /*TemplateKeyword=*/false,
807 Template = TemplateName(TD);
810 if (IsFunctionTemplate) {
811 // Function templates always go through overload resolution, at which
812 // point we'll perform the various checks (e.g., accessibility) we need
813 // to based on which function we selected.
814 Result.suppressDiagnostics();
816 return NameClassification::FunctionTemplate(Template);
819 return NameClassification::TypeTemplate(Template);
823 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
824 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
825 DiagnoseUseOfDecl(Type, NameLoc);
826 QualType T = Context.getTypeDeclType(Type);
828 return buildNestedType(*this, SS, T, NameLoc);
829 return ParsedType::make(T);
832 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
834 // FIXME: It's unfortunate that we don't have a Type node for handling this.
835 if (ObjCCompatibleAliasDecl *Alias
836 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
837 Class = Alias->getClassInterface();
841 DiagnoseUseOfDecl(Class, NameLoc);
843 if (NextToken.is(tok::period)) {
844 // Interface. <something> is parsed as a property reference expression.
845 // Just return "unknown" as a fall-through for now.
846 Result.suppressDiagnostics();
847 return NameClassification::Unknown();
850 QualType T = Context.getObjCInterfaceType(Class);
851 return ParsedType::make(T);
854 // We can have a type template here if we're classifying a template argument.
855 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl))
856 return NameClassification::TypeTemplate(
857 TemplateName(cast<TemplateDecl>(FirstDecl)));
859 // Check for a tag type hidden by a non-type decl in a few cases where it
860 // seems likely a type is wanted instead of the non-type that was found.
861 if (!getLangOpts().ObjC1) {
862 bool NextIsOp = NextToken.is(tok::amp) || NextToken.is(tok::star);
863 if ((NextToken.is(tok::identifier) ||
864 (NextIsOp && FirstDecl->isFunctionOrFunctionTemplate())) &&
865 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
866 TypeDecl *Type = Result.getAsSingle<TypeDecl>();
867 DiagnoseUseOfDecl(Type, NameLoc);
868 QualType T = Context.getTypeDeclType(Type);
870 return buildNestedType(*this, SS, T, NameLoc);
871 return ParsedType::make(T);
875 if (FirstDecl->isCXXClassMember())
876 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0);
878 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
879 return BuildDeclarationNameExpr(SS, Result, ADL);
882 // Determines the context to return to after temporarily entering a
883 // context. This depends in an unnecessarily complicated way on the
884 // exact ordering of callbacks from the parser.
885 DeclContext *Sema::getContainingDC(DeclContext *DC) {
887 // Functions defined inline within classes aren't parsed until we've
888 // finished parsing the top-level class, so the top-level class is
889 // the context we'll need to return to.
890 if (isa<FunctionDecl>(DC)) {
891 DC = DC->getLexicalParent();
893 // A function not defined within a class will always return to its
895 if (!isa<CXXRecordDecl>(DC))
898 // A C++ inline method/friend is parsed *after* the topmost class
899 // it was declared in is fully parsed ("complete"); the topmost
900 // class is the context we need to return to.
901 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
904 // Return the declaration context of the topmost class the inline method is
909 return DC->getLexicalParent();
912 void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
913 assert(getContainingDC(DC) == CurContext &&
914 "The next DeclContext should be lexically contained in the current one.");
919 void Sema::PopDeclContext() {
920 assert(CurContext && "DeclContext imbalance!");
922 CurContext = getContainingDC(CurContext);
923 assert(CurContext && "Popped translation unit!");
926 /// EnterDeclaratorContext - Used when we must lookup names in the context
927 /// of a declarator's nested name specifier.
929 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
930 // C++0x [basic.lookup.unqual]p13:
931 // A name used in the definition of a static data member of class
932 // X (after the qualified-id of the static member) is looked up as
933 // if the name was used in a member function of X.
934 // C++0x [basic.lookup.unqual]p14:
935 // If a variable member of a namespace is defined outside of the
936 // scope of its namespace then any name used in the definition of
937 // the variable member (after the declarator-id) is looked up as
938 // if the definition of the variable member occurred in its
940 // Both of these imply that we should push a scope whose context
941 // is the semantic context of the declaration. We can't use
942 // PushDeclContext here because that context is not necessarily
943 // lexically contained in the current context. Fortunately,
944 // the containing scope should have the appropriate information.
946 assert(!S->getEntity() && "scope already has entity");
949 Scope *Ancestor = S->getParent();
950 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
951 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
958 void Sema::ExitDeclaratorContext(Scope *S) {
959 assert(S->getEntity() == CurContext && "Context imbalance!");
961 // Switch back to the lexical context. The safety of this is
962 // enforced by an assert in EnterDeclaratorContext.
963 Scope *Ancestor = S->getParent();
964 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
965 CurContext = (DeclContext*) Ancestor->getEntity();
967 // We don't need to do anything with the scope, which is going to
972 void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
973 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
974 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) {
975 // We assume that the caller has already called
976 // ActOnReenterTemplateScope
977 FD = TFD->getTemplatedDecl();
982 // Same implementation as PushDeclContext, but enters the context
983 // from the lexical parent, rather than the top-level class.
984 assert(CurContext == FD->getLexicalParent() &&
985 "The next DeclContext should be lexically contained in the current one.");
987 S->setEntity(CurContext);
989 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
990 ParmVarDecl *Param = FD->getParamDecl(P);
991 // If the parameter has an identifier, then add it to the scope
992 if (Param->getIdentifier()) {
994 IdResolver.AddDecl(Param);
1000 void Sema::ActOnExitFunctionContext() {
1001 // Same implementation as PopDeclContext, but returns to the lexical parent,
1002 // rather than the top-level class.
1003 assert(CurContext && "DeclContext imbalance!");
1004 CurContext = CurContext->getLexicalParent();
1005 assert(CurContext && "Popped translation unit!");
1009 /// \brief Determine whether we allow overloading of the function
1010 /// PrevDecl with another declaration.
1012 /// This routine determines whether overloading is possible, not
1013 /// whether some new function is actually an overload. It will return
1014 /// true in C++ (where we can always provide overloads) or, as an
1015 /// extension, in C when the previous function is already an
1016 /// overloaded function declaration or has the "overloadable"
1018 static bool AllowOverloadingOfFunction(LookupResult &Previous,
1019 ASTContext &Context) {
1020 if (Context.getLangOpts().CPlusPlus)
1023 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
1026 return (Previous.getResultKind() == LookupResult::Found
1027 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
1030 /// Add this decl to the scope shadowed decl chains.
1031 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
1032 // Move up the scope chain until we find the nearest enclosing
1033 // non-transparent context. The declaration will be introduced into this
1035 while (S->getEntity() &&
1036 ((DeclContext *)S->getEntity())->isTransparentContext())
1039 // Add scoped declarations into their context, so that they can be
1040 // found later. Declarations without a context won't be inserted
1041 // into any context.
1043 CurContext->addDecl(D);
1045 // Out-of-line definitions shouldn't be pushed into scope in C++.
1046 // Out-of-line variable and function definitions shouldn't even in C.
1047 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
1049 !D->getDeclContext()->getRedeclContext()->Equals(
1050 D->getLexicalDeclContext()->getRedeclContext()))
1053 // Template instantiations should also not be pushed into scope.
1054 if (isa<FunctionDecl>(D) &&
1055 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
1058 // If this replaces anything in the current scope,
1059 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
1060 IEnd = IdResolver.end();
1061 for (; I != IEnd; ++I) {
1062 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
1064 IdResolver.RemoveDecl(*I);
1066 // Should only need to replace one decl.
1073 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
1074 // Implicitly-generated labels may end up getting generated in an order that
1075 // isn't strictly lexical, which breaks name lookup. Be careful to insert
1076 // the label at the appropriate place in the identifier chain.
1077 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
1078 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
1079 if (IDC == CurContext) {
1080 if (!S->isDeclScope(*I))
1082 } else if (IDC->Encloses(CurContext))
1086 IdResolver.InsertDeclAfter(I, D);
1088 IdResolver.AddDecl(D);
1092 void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) {
1093 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope)
1094 TUScope->AddDecl(D);
1097 bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S,
1098 bool ExplicitInstantiationOrSpecialization) {
1099 return IdResolver.isDeclInScope(D, Ctx, S,
1100 ExplicitInstantiationOrSpecialization);
1103 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
1104 DeclContext *TargetDC = DC->getPrimaryContext();
1106 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
1107 if (ScopeDC->getPrimaryContext() == TargetDC)
1109 } while ((S = S->getParent()));
1114 static bool isOutOfScopePreviousDeclaration(NamedDecl *,
1118 /// Filters out lookup results that don't fall within the given scope
1119 /// as determined by isDeclInScope.
1120 void Sema::FilterLookupForScope(LookupResult &R,
1121 DeclContext *Ctx, Scope *S,
1122 bool ConsiderLinkage,
1123 bool ExplicitInstantiationOrSpecialization) {
1124 LookupResult::Filter F = R.makeFilter();
1125 while (F.hasNext()) {
1126 NamedDecl *D = F.next();
1128 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization))
1131 if (ConsiderLinkage &&
1132 isOutOfScopePreviousDeclaration(D, Ctx, Context))
1141 static bool isUsingDecl(NamedDecl *D) {
1142 return isa<UsingShadowDecl>(D) ||
1143 isa<UnresolvedUsingTypenameDecl>(D) ||
1144 isa<UnresolvedUsingValueDecl>(D);
1147 /// Removes using shadow declarations from the lookup results.
1148 static void RemoveUsingDecls(LookupResult &R) {
1149 LookupResult::Filter F = R.makeFilter();
1151 if (isUsingDecl(F.next()))
1157 /// \brief Check for this common pattern:
1160 /// S(const S&); // DO NOT IMPLEMENT
1161 /// void operator=(const S&); // DO NOT IMPLEMENT
1164 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
1165 // FIXME: Should check for private access too but access is set after we get
1167 if (D->doesThisDeclarationHaveABody())
1170 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
1171 return CD->isCopyConstructor();
1172 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1173 return Method->isCopyAssignmentOperator();
1177 // We need this to handle
1180 // void *foo() { return 0; }
1183 // When we see foo we don't know if after the typedef we will get 'A' or '*A'
1184 // for example. If 'A', foo will have external linkage. If we have '*A',
1185 // foo will have no linkage. Since we can't know untill we get to the end
1186 // of the typedef, this function finds out if D might have non external linkage.
1187 // Callers should verify at the end of the TU if it D has external linkage or
1189 bool Sema::mightHaveNonExternalLinkage(const DeclaratorDecl *D) {
1190 const DeclContext *DC = D->getDeclContext();
1191 while (!DC->isTranslationUnit()) {
1192 if (const RecordDecl *RD = dyn_cast<RecordDecl>(DC)){
1193 if (!RD->hasNameForLinkage())
1196 DC = DC->getParent();
1199 return !D->hasExternalLinkage();
1202 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
1205 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
1208 // Ignore class templates.
1209 if (D->getDeclContext()->isDependentContext() ||
1210 D->getLexicalDeclContext()->isDependentContext())
1213 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1214 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1217 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
1218 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
1221 // 'static inline' functions are used in headers; don't warn.
1222 // Make sure we get the storage class from the canonical declaration,
1223 // since otherwise we will get spurious warnings on specialized
1224 // static template functions.
1225 if (FD->getCanonicalDecl()->getStorageClass() == SC_Static &&
1226 FD->isInlineSpecified())
1230 if (FD->doesThisDeclarationHaveABody() &&
1231 Context.DeclMustBeEmitted(FD))
1233 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1234 // Don't warn on variables of const-qualified or reference type, since their
1235 // values can be used even if though they're not odr-used, and because const
1236 // qualified variables can appear in headers in contexts where they're not
1237 // intended to be used.
1238 // FIXME: Use more principled rules for these exemptions.
1239 if (!VD->isFileVarDecl() ||
1240 VD->getType().isConstQualified() ||
1241 VD->getType()->isReferenceType() ||
1242 Context.DeclMustBeEmitted(VD))
1245 if (VD->isStaticDataMember() &&
1246 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1253 // Only warn for unused decls internal to the translation unit.
1254 return mightHaveNonExternalLinkage(D);
1257 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
1261 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1262 const FunctionDecl *First = FD->getFirstDeclaration();
1263 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1264 return; // First should already be in the vector.
1267 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1268 const VarDecl *First = VD->getFirstDeclaration();
1269 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1270 return; // First should already be in the vector.
1273 if (ShouldWarnIfUnusedFileScopedDecl(D))
1274 UnusedFileScopedDecls.push_back(D);
1277 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
1278 if (D->isInvalidDecl())
1281 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>())
1284 if (isa<LabelDecl>(D))
1287 // White-list anything that isn't a local variable.
1288 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
1289 !D->getDeclContext()->isFunctionOrMethod())
1292 // Types of valid local variables should be complete, so this should succeed.
1293 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1295 // White-list anything with an __attribute__((unused)) type.
1296 QualType Ty = VD->getType();
1298 // Only look at the outermost level of typedef.
1299 if (const TypedefType *TT = Ty->getAs<TypedefType>()) {
1300 if (TT->getDecl()->hasAttr<UnusedAttr>())
1304 // If we failed to complete the type for some reason, or if the type is
1305 // dependent, don't diagnose the variable.
1306 if (Ty->isIncompleteType() || Ty->isDependentType())
1309 if (const TagType *TT = Ty->getAs<TagType>()) {
1310 const TagDecl *Tag = TT->getDecl();
1311 if (Tag->hasAttr<UnusedAttr>())
1314 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
1315 if (!RD->hasTrivialDestructor())
1318 if (const Expr *Init = VD->getInit()) {
1319 if (const ExprWithCleanups *Cleanups = dyn_cast<ExprWithCleanups>(Init))
1320 Init = Cleanups->getSubExpr();
1321 const CXXConstructExpr *Construct =
1322 dyn_cast<CXXConstructExpr>(Init);
1323 if (Construct && !Construct->isElidable()) {
1324 CXXConstructorDecl *CD = Construct->getConstructor();
1325 if (!CD->isTrivial())
1332 // TODO: __attribute__((unused)) templates?
1338 static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
1340 if (isa<LabelDecl>(D)) {
1341 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
1342 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true);
1343 if (AfterColon.isInvalid())
1345 Hint = FixItHint::CreateRemoval(CharSourceRange::
1346 getCharRange(D->getLocStart(), AfterColon));
1351 /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
1352 /// unless they are marked attr(unused).
1353 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
1355 if (!ShouldDiagnoseUnusedDecl(D))
1358 GenerateFixForUnusedDecl(D, Context, Hint);
1361 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
1362 DiagID = diag::warn_unused_exception_param;
1363 else if (isa<LabelDecl>(D))
1364 DiagID = diag::warn_unused_label;
1366 DiagID = diag::warn_unused_variable;
1368 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
1371 static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
1372 // Verify that we have no forward references left. If so, there was a goto
1373 // or address of a label taken, but no definition of it. Label fwd
1374 // definitions are indicated with a null substmt.
1375 if (L->getStmt() == 0)
1376 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
1379 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
1380 if (S->decl_empty()) return;
1381 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
1382 "Scope shouldn't contain decls!");
1384 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
1387 assert(TmpD && "This decl didn't get pushed??");
1389 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
1390 NamedDecl *D = cast<NamedDecl>(TmpD);
1392 if (!D->getDeclName()) continue;
1394 // Diagnose unused variables in this scope.
1395 if (!S->hasUnrecoverableErrorOccurred())
1396 DiagnoseUnusedDecl(D);
1398 // If this was a forward reference to a label, verify it was defined.
1399 if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
1400 CheckPoppedLabel(LD, *this);
1402 // Remove this name from our lexical scope.
1403 IdResolver.RemoveDecl(D);
1407 void Sema::ActOnStartFunctionDeclarator() {
1408 ++InFunctionDeclarator;
1411 void Sema::ActOnEndFunctionDeclarator() {
1412 assert(InFunctionDeclarator);
1413 --InFunctionDeclarator;
1416 /// \brief Look for an Objective-C class in the translation unit.
1418 /// \param Id The name of the Objective-C class we're looking for. If
1419 /// typo-correction fixes this name, the Id will be updated
1420 /// to the fixed name.
1422 /// \param IdLoc The location of the name in the translation unit.
1424 /// \param DoTypoCorrection If true, this routine will attempt typo correction
1425 /// if there is no class with the given name.
1427 /// \returns The declaration of the named Objective-C class, or NULL if the
1428 /// class could not be found.
1429 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
1430 SourceLocation IdLoc,
1431 bool DoTypoCorrection) {
1432 // The third "scope" argument is 0 since we aren't enabling lazy built-in
1433 // creation from this context.
1434 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
1436 if (!IDecl && DoTypoCorrection) {
1437 // Perform typo correction at the given location, but only if we
1438 // find an Objective-C class name.
1439 DeclFilterCCC<ObjCInterfaceDecl> Validator;
1440 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc),
1441 LookupOrdinaryName, TUScope, NULL,
1443 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>();
1444 Diag(IdLoc, diag::err_undef_interface_suggest)
1445 << Id << IDecl->getDeclName()
1446 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
1447 Diag(IDecl->getLocation(), diag::note_previous_decl)
1448 << IDecl->getDeclName();
1450 Id = IDecl->getIdentifier();
1453 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
1454 // This routine must always return a class definition, if any.
1455 if (Def && Def->getDefinition())
1456 Def = Def->getDefinition();
1460 /// getNonFieldDeclScope - Retrieves the innermost scope, starting
1461 /// from S, where a non-field would be declared. This routine copes
1462 /// with the difference between C and C++ scoping rules in structs and
1463 /// unions. For example, the following code is well-formed in C but
1464 /// ill-formed in C++:
1470 /// void test_S6() {
1475 /// For the declaration of BAR, this routine will return a different
1476 /// scope. The scope S will be the scope of the unnamed enumeration
1477 /// within S6. In C++, this routine will return the scope associated
1478 /// with S6, because the enumeration's scope is a transparent
1479 /// context but structures can contain non-field names. In C, this
1480 /// routine will return the translation unit scope, since the
1481 /// enumeration's scope is a transparent context and structures cannot
1482 /// contain non-field names.
1483 Scope *Sema::getNonFieldDeclScope(Scope *S) {
1484 while (((S->getFlags() & Scope::DeclScope) == 0) ||
1486 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
1487 (S->isClassScope() && !getLangOpts().CPlusPlus))
1492 /// \brief Looks up the declaration of "struct objc_super" and
1493 /// saves it for later use in building builtin declaration of
1494 /// objc_msgSendSuper and objc_msgSendSuper_stret. If no such
1495 /// pre-existing declaration exists no action takes place.
1496 static void LookupPredefedObjCSuperType(Sema &ThisSema, Scope *S,
1497 IdentifierInfo *II) {
1498 if (!II->isStr("objc_msgSendSuper"))
1500 ASTContext &Context = ThisSema.Context;
1502 LookupResult Result(ThisSema, &Context.Idents.get("objc_super"),
1503 SourceLocation(), Sema::LookupTagName);
1504 ThisSema.LookupName(Result, S);
1505 if (Result.getResultKind() == LookupResult::Found)
1506 if (const TagDecl *TD = Result.getAsSingle<TagDecl>())
1507 Context.setObjCSuperType(Context.getTagDeclType(TD));
1510 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
1511 /// file scope. lazily create a decl for it. ForRedeclaration is true
1512 /// if we're creating this built-in in anticipation of redeclaring the
1514 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
1515 Scope *S, bool ForRedeclaration,
1516 SourceLocation Loc) {
1517 LookupPredefedObjCSuperType(*this, S, II);
1519 Builtin::ID BID = (Builtin::ID)bid;
1521 ASTContext::GetBuiltinTypeError Error;
1522 QualType R = Context.GetBuiltinType(BID, Error);
1524 case ASTContext::GE_None:
1528 case ASTContext::GE_Missing_stdio:
1529 if (ForRedeclaration)
1530 Diag(Loc, diag::warn_implicit_decl_requires_stdio)
1531 << Context.BuiltinInfo.GetName(BID);
1534 case ASTContext::GE_Missing_setjmp:
1535 if (ForRedeclaration)
1536 Diag(Loc, diag::warn_implicit_decl_requires_setjmp)
1537 << Context.BuiltinInfo.GetName(BID);
1540 case ASTContext::GE_Missing_ucontext:
1541 if (ForRedeclaration)
1542 Diag(Loc, diag::warn_implicit_decl_requires_ucontext)
1543 << Context.BuiltinInfo.GetName(BID);
1547 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
1548 Diag(Loc, diag::ext_implicit_lib_function_decl)
1549 << Context.BuiltinInfo.GetName(BID)
1551 if (Context.BuiltinInfo.getHeaderName(BID) &&
1552 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc)
1553 != DiagnosticsEngine::Ignored)
1554 Diag(Loc, diag::note_please_include_header)
1555 << Context.BuiltinInfo.getHeaderName(BID)
1556 << Context.BuiltinInfo.GetName(BID);
1559 FunctionDecl *New = FunctionDecl::Create(Context,
1560 Context.getTranslationUnitDecl(),
1561 Loc, Loc, II, R, /*TInfo=*/0,
1564 /*hasPrototype=*/true);
1567 // Create Decl objects for each parameter, adding them to the
1569 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
1570 SmallVector<ParmVarDecl*, 16> Params;
1571 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
1573 ParmVarDecl::Create(Context, New, SourceLocation(),
1574 SourceLocation(), 0,
1575 FT->getArgType(i), /*TInfo=*/0,
1577 parm->setScopeInfo(0, i);
1578 Params.push_back(parm);
1580 New->setParams(Params);
1583 AddKnownFunctionAttributes(New);
1585 // TUScope is the translation-unit scope to insert this function into.
1586 // FIXME: This is hideous. We need to teach PushOnScopeChains to
1587 // relate Scopes to DeclContexts, and probably eliminate CurContext
1588 // entirely, but we're not there yet.
1589 DeclContext *SavedContext = CurContext;
1590 CurContext = Context.getTranslationUnitDecl();
1591 PushOnScopeChains(New, TUScope);
1592 CurContext = SavedContext;
1596 /// \brief Filter out any previous declarations that the given declaration
1597 /// should not consider because they are not permitted to conflict, e.g.,
1598 /// because they come from hidden sub-modules and do not refer to the same
1600 static void filterNonConflictingPreviousDecls(ASTContext &context,
1602 LookupResult &previous){
1603 // This is only interesting when modules are enabled.
1604 if (!context.getLangOpts().Modules)
1607 // Empty sets are uninteresting.
1608 if (previous.empty())
1611 LookupResult::Filter filter = previous.makeFilter();
1612 while (filter.hasNext()) {
1613 NamedDecl *old = filter.next();
1615 // Non-hidden declarations are never ignored.
1616 if (!old->isHidden())
1619 if (old->getLinkage() != ExternalLinkage)
1626 bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
1628 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
1629 OldType = OldTypedef->getUnderlyingType();
1631 OldType = Context.getTypeDeclType(Old);
1632 QualType NewType = New->getUnderlyingType();
1634 if (NewType->isVariablyModifiedType()) {
1635 // Must not redefine a typedef with a variably-modified type.
1636 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1637 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef)
1639 if (Old->getLocation().isValid())
1640 Diag(Old->getLocation(), diag::note_previous_definition);
1641 New->setInvalidDecl();
1645 if (OldType != NewType &&
1646 !OldType->isDependentType() &&
1647 !NewType->isDependentType() &&
1648 !Context.hasSameType(OldType, NewType)) {
1649 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1650 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
1651 << Kind << NewType << OldType;
1652 if (Old->getLocation().isValid())
1653 Diag(Old->getLocation(), diag::note_previous_definition);
1654 New->setInvalidDecl();
1660 /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
1661 /// same name and scope as a previous declaration 'Old'. Figure out
1662 /// how to resolve this situation, merging decls or emitting
1663 /// diagnostics as appropriate. If there was an error, set New to be invalid.
1665 void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) {
1666 // If the new decl is known invalid already, don't bother doing any
1668 if (New->isInvalidDecl()) return;
1670 // Allow multiple definitions for ObjC built-in typedefs.
1671 // FIXME: Verify the underlying types are equivalent!
1672 if (getLangOpts().ObjC1) {
1673 const IdentifierInfo *TypeID = New->getIdentifier();
1674 switch (TypeID->getLength()) {
1678 if (!TypeID->isStr("id"))
1680 QualType T = New->getUnderlyingType();
1681 if (!T->isPointerType())
1683 if (!T->isVoidPointerType()) {
1684 QualType PT = T->getAs<PointerType>()->getPointeeType();
1685 if (!PT->isStructureType())
1688 Context.setObjCIdRedefinitionType(T);
1689 // Install the built-in type for 'id', ignoring the current definition.
1690 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
1694 if (!TypeID->isStr("Class"))
1696 Context.setObjCClassRedefinitionType(New->getUnderlyingType());
1697 // Install the built-in type for 'Class', ignoring the current definition.
1698 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
1701 if (!TypeID->isStr("SEL"))
1703 Context.setObjCSelRedefinitionType(New->getUnderlyingType());
1704 // Install the built-in type for 'SEL', ignoring the current definition.
1705 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
1708 // Fall through - the typedef name was not a builtin type.
1711 // Verify the old decl was also a type.
1712 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
1714 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1715 << New->getDeclName();
1717 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
1718 if (OldD->getLocation().isValid())
1719 Diag(OldD->getLocation(), diag::note_previous_definition);
1721 return New->setInvalidDecl();
1724 // If the old declaration is invalid, just give up here.
1725 if (Old->isInvalidDecl())
1726 return New->setInvalidDecl();
1728 // If the typedef types are not identical, reject them in all languages and
1729 // with any extensions enabled.
1730 if (isIncompatibleTypedef(Old, New))
1733 // The types match. Link up the redeclaration chain if the old
1734 // declaration was a typedef.
1735 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old))
1736 New->setPreviousDeclaration(Typedef);
1738 if (getLangOpts().MicrosoftExt)
1741 if (getLangOpts().CPlusPlus) {
1742 // C++ [dcl.typedef]p2:
1743 // In a given non-class scope, a typedef specifier can be used to
1744 // redefine the name of any type declared in that scope to refer
1745 // to the type to which it already refers.
1746 if (!isa<CXXRecordDecl>(CurContext))
1749 // C++0x [dcl.typedef]p4:
1750 // In a given class scope, a typedef specifier can be used to redefine
1751 // any class-name declared in that scope that is not also a typedef-name
1752 // to refer to the type to which it already refers.
1754 // This wording came in via DR424, which was a correction to the
1755 // wording in DR56, which accidentally banned code like:
1758 // typedef struct A { } A;
1761 // in the C++03 standard. We implement the C++0x semantics, which
1762 // allow the above but disallow
1769 // since that was the intent of DR56.
1770 if (!isa<TypedefNameDecl>(Old))
1773 Diag(New->getLocation(), diag::err_redefinition)
1774 << New->getDeclName();
1775 Diag(Old->getLocation(), diag::note_previous_definition);
1776 return New->setInvalidDecl();
1779 // Modules always permit redefinition of typedefs, as does C11.
1780 if (getLangOpts().Modules || getLangOpts().C11)
1783 // If we have a redefinition of a typedef in C, emit a warning. This warning
1784 // is normally mapped to an error, but can be controlled with
1785 // -Wtypedef-redefinition. If either the original or the redefinition is
1786 // in a system header, don't emit this for compatibility with GCC.
1787 if (getDiagnostics().getSuppressSystemWarnings() &&
1788 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
1789 Context.getSourceManager().isInSystemHeader(New->getLocation())))
1792 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
1793 << New->getDeclName();
1794 Diag(Old->getLocation(), diag::note_previous_definition);
1798 /// DeclhasAttr - returns true if decl Declaration already has the target
1801 DeclHasAttr(const Decl *D, const Attr *A) {
1802 // There can be multiple AvailabilityAttr in a Decl. Make sure we copy
1803 // all of them. It is mergeAvailabilityAttr in SemaDeclAttr.cpp that is
1804 // responsible for making sure they are consistent.
1805 const AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(A);
1809 // The following thread safety attributes can also be duplicated.
1810 switch (A->getKind()) {
1811 case attr::ExclusiveLocksRequired:
1812 case attr::SharedLocksRequired:
1813 case attr::LocksExcluded:
1814 case attr::ExclusiveLockFunction:
1815 case attr::SharedLockFunction:
1816 case attr::UnlockFunction:
1817 case attr::ExclusiveTrylockFunction:
1818 case attr::SharedTrylockFunction:
1819 case attr::GuardedBy:
1820 case attr::PtGuardedBy:
1821 case attr::AcquiredBefore:
1822 case attr::AcquiredAfter:
1828 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
1829 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
1830 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
1831 if ((*i)->getKind() == A->getKind()) {
1833 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation())
1837 // FIXME: Don't hardcode this check
1838 if (OA && isa<OwnershipAttr>(*i))
1839 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
1846 static bool isAttributeTargetADefinition(Decl *D) {
1847 if (VarDecl *VD = dyn_cast<VarDecl>(D))
1848 return VD->isThisDeclarationADefinition();
1849 if (TagDecl *TD = dyn_cast<TagDecl>(D))
1850 return TD->isCompleteDefinition() || TD->isBeingDefined();
1854 /// Merge alignment attributes from \p Old to \p New, taking into account the
1855 /// special semantics of C11's _Alignas specifier and C++11's alignas attribute.
1857 /// \return \c true if any attributes were added to \p New.
1858 static bool mergeAlignedAttrs(Sema &S, NamedDecl *New, Decl *Old) {
1859 // Look for alignas attributes on Old, and pick out whichever attribute
1860 // specifies the strictest alignment requirement.
1861 AlignedAttr *OldAlignasAttr = 0;
1862 AlignedAttr *OldStrictestAlignAttr = 0;
1863 unsigned OldAlign = 0;
1864 for (specific_attr_iterator<AlignedAttr>
1865 I = Old->specific_attr_begin<AlignedAttr>(),
1866 E = Old->specific_attr_end<AlignedAttr>(); I != E; ++I) {
1867 // FIXME: We have no way of representing inherited dependent alignments
1869 // template<int A, int B> struct alignas(A) X;
1870 // template<int A, int B> struct alignas(B) X {};
1871 // For now, we just ignore any alignas attributes which are not on the
1872 // definition in such a case.
1873 if (I->isAlignmentDependent())
1877 OldAlignasAttr = *I;
1879 unsigned Align = I->getAlignment(S.Context);
1880 if (Align > OldAlign) {
1882 OldStrictestAlignAttr = *I;
1886 // Look for alignas attributes on New.
1887 AlignedAttr *NewAlignasAttr = 0;
1888 unsigned NewAlign = 0;
1889 for (specific_attr_iterator<AlignedAttr>
1890 I = New->specific_attr_begin<AlignedAttr>(),
1891 E = New->specific_attr_end<AlignedAttr>(); I != E; ++I) {
1892 if (I->isAlignmentDependent())
1896 NewAlignasAttr = *I;
1898 unsigned Align = I->getAlignment(S.Context);
1899 if (Align > NewAlign)
1903 if (OldAlignasAttr && NewAlignasAttr && OldAlign != NewAlign) {
1904 // Both declarations have 'alignas' attributes. We require them to match.
1905 // C++11 [dcl.align]p6 and C11 6.7.5/7 both come close to saying this, but
1906 // fall short. (If two declarations both have alignas, they must both match
1907 // every definition, and so must match each other if there is a definition.)
1909 // If either declaration only contains 'alignas(0)' specifiers, then it
1910 // specifies the natural alignment for the type.
1911 if (OldAlign == 0 || NewAlign == 0) {
1913 if (ValueDecl *VD = dyn_cast<ValueDecl>(New))
1916 Ty = S.Context.getTagDeclType(cast<TagDecl>(New));
1919 OldAlign = S.Context.getTypeAlign(Ty);
1921 NewAlign = S.Context.getTypeAlign(Ty);
1924 if (OldAlign != NewAlign) {
1925 S.Diag(NewAlignasAttr->getLocation(), diag::err_alignas_mismatch)
1926 << (unsigned)S.Context.toCharUnitsFromBits(OldAlign).getQuantity()
1927 << (unsigned)S.Context.toCharUnitsFromBits(NewAlign).getQuantity();
1928 S.Diag(OldAlignasAttr->getLocation(), diag::note_previous_declaration);
1932 if (OldAlignasAttr && !NewAlignasAttr && isAttributeTargetADefinition(New)) {
1933 // C++11 [dcl.align]p6:
1934 // if any declaration of an entity has an alignment-specifier,
1935 // every defining declaration of that entity shall specify an
1936 // equivalent alignment.
1938 // If the definition of an object does not have an alignment
1939 // specifier, any other declaration of that object shall also
1940 // have no alignment specifier.
1941 S.Diag(New->getLocation(), diag::err_alignas_missing_on_definition)
1942 << OldAlignasAttr->isC11();
1943 S.Diag(OldAlignasAttr->getLocation(), diag::note_alignas_on_declaration)
1944 << OldAlignasAttr->isC11();
1947 bool AnyAdded = false;
1949 // Ensure we have an attribute representing the strictest alignment.
1950 if (OldAlign > NewAlign) {
1951 AlignedAttr *Clone = OldStrictestAlignAttr->clone(S.Context);
1952 Clone->setInherited(true);
1953 New->addAttr(Clone);
1957 // Ensure we have an alignas attribute if the old declaration had one.
1958 if (OldAlignasAttr && !NewAlignasAttr &&
1959 !(AnyAdded && OldStrictestAlignAttr->isAlignas())) {
1960 AlignedAttr *Clone = OldAlignasAttr->clone(S.Context);
1961 Clone->setInherited(true);
1962 New->addAttr(Clone);
1969 static bool mergeDeclAttribute(Sema &S, NamedDecl *D, InheritableAttr *Attr,
1971 InheritableAttr *NewAttr = NULL;
1972 unsigned AttrSpellingListIndex = Attr->getSpellingListIndex();
1973 if (AvailabilityAttr *AA = dyn_cast<AvailabilityAttr>(Attr))
1974 NewAttr = S.mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(),
1975 AA->getIntroduced(), AA->getDeprecated(),
1976 AA->getObsoleted(), AA->getUnavailable(),
1977 AA->getMessage(), Override,
1978 AttrSpellingListIndex);
1979 else if (VisibilityAttr *VA = dyn_cast<VisibilityAttr>(Attr))
1980 NewAttr = S.mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
1981 AttrSpellingListIndex);
1982 else if (TypeVisibilityAttr *VA = dyn_cast<TypeVisibilityAttr>(Attr))
1983 NewAttr = S.mergeTypeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
1984 AttrSpellingListIndex);
1985 else if (DLLImportAttr *ImportA = dyn_cast<DLLImportAttr>(Attr))
1986 NewAttr = S.mergeDLLImportAttr(D, ImportA->getRange(),
1987 AttrSpellingListIndex);
1988 else if (DLLExportAttr *ExportA = dyn_cast<DLLExportAttr>(Attr))
1989 NewAttr = S.mergeDLLExportAttr(D, ExportA->getRange(),
1990 AttrSpellingListIndex);
1991 else if (FormatAttr *FA = dyn_cast<FormatAttr>(Attr))
1992 NewAttr = S.mergeFormatAttr(D, FA->getRange(), FA->getType(),
1993 FA->getFormatIdx(), FA->getFirstArg(),
1994 AttrSpellingListIndex);
1995 else if (SectionAttr *SA = dyn_cast<SectionAttr>(Attr))
1996 NewAttr = S.mergeSectionAttr(D, SA->getRange(), SA->getName(),
1997 AttrSpellingListIndex);
1998 else if (isa<AlignedAttr>(Attr))
1999 // AlignedAttrs are handled separately, because we need to handle all
2000 // such attributes on a declaration at the same time.
2002 else if (!DeclHasAttr(D, Attr))
2003 NewAttr = cast<InheritableAttr>(Attr->clone(S.Context));
2006 NewAttr->setInherited(true);
2007 D->addAttr(NewAttr);
2014 static const Decl *getDefinition(const Decl *D) {
2015 if (const TagDecl *TD = dyn_cast<TagDecl>(D))
2016 return TD->getDefinition();
2017 if (const VarDecl *VD = dyn_cast<VarDecl>(D))
2018 return VD->getDefinition();
2019 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2020 const FunctionDecl* Def;
2021 if (FD->hasBody(Def))
2027 static bool hasAttribute(const Decl *D, attr::Kind Kind) {
2028 for (Decl::attr_iterator I = D->attr_begin(), E = D->attr_end();
2030 Attr *Attribute = *I;
2031 if (Attribute->getKind() == Kind)
2037 /// checkNewAttributesAfterDef - If we already have a definition, check that
2038 /// there are no new attributes in this declaration.
2039 static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) {
2040 if (!New->hasAttrs())
2043 const Decl *Def = getDefinition(Old);
2044 if (!Def || Def == New)
2047 AttrVec &NewAttributes = New->getAttrs();
2048 for (unsigned I = 0, E = NewAttributes.size(); I != E;) {
2049 const Attr *NewAttribute = NewAttributes[I];
2050 if (hasAttribute(Def, NewAttribute->getKind())) {
2052 continue; // regular attr merging will take care of validating this.
2055 if (isa<C11NoReturnAttr>(NewAttribute)) {
2056 // C's _Noreturn is allowed to be added to a function after it is defined.
2059 } else if (const AlignedAttr *AA = dyn_cast<AlignedAttr>(NewAttribute)) {
2060 if (AA->isAlignas()) {
2061 // C++11 [dcl.align]p6:
2062 // if any declaration of an entity has an alignment-specifier,
2063 // every defining declaration of that entity shall specify an
2064 // equivalent alignment.
2066 // If the definition of an object does not have an alignment
2067 // specifier, any other declaration of that object shall also
2068 // have no alignment specifier.
2069 S.Diag(Def->getLocation(), diag::err_alignas_missing_on_definition)
2071 S.Diag(NewAttribute->getLocation(), diag::note_alignas_on_declaration)
2073 NewAttributes.erase(NewAttributes.begin() + I);
2079 S.Diag(NewAttribute->getLocation(),
2080 diag::warn_attribute_precede_definition);
2081 S.Diag(Def->getLocation(), diag::note_previous_definition);
2082 NewAttributes.erase(NewAttributes.begin() + I);
2087 /// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
2088 void Sema::mergeDeclAttributes(NamedDecl *New, Decl *Old,
2089 AvailabilityMergeKind AMK) {
2090 if (!Old->hasAttrs() && !New->hasAttrs())
2093 // attributes declared post-definition are currently ignored
2094 checkNewAttributesAfterDef(*this, New, Old);
2096 if (!Old->hasAttrs())
2099 bool foundAny = New->hasAttrs();
2101 // Ensure that any moving of objects within the allocated map is done before
2103 if (!foundAny) New->setAttrs(AttrVec());
2105 for (specific_attr_iterator<InheritableAttr>
2106 i = Old->specific_attr_begin<InheritableAttr>(),
2107 e = Old->specific_attr_end<InheritableAttr>();
2109 bool Override = false;
2110 // Ignore deprecated/unavailable/availability attributes if requested.
2111 if (isa<DeprecatedAttr>(*i) ||
2112 isa<UnavailableAttr>(*i) ||
2113 isa<AvailabilityAttr>(*i)) {
2118 case AMK_Redeclaration:
2127 if (mergeDeclAttribute(*this, New, *i, Override))
2131 if (mergeAlignedAttrs(*this, New, Old))
2134 if (!foundAny) New->dropAttrs();
2137 /// mergeParamDeclAttributes - Copy attributes from the old parameter
2139 static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
2140 const ParmVarDecl *oldDecl,
2142 // C++11 [dcl.attr.depend]p2:
2143 // The first declaration of a function shall specify the
2144 // carries_dependency attribute for its declarator-id if any declaration
2145 // of the function specifies the carries_dependency attribute.
2146 if (newDecl->hasAttr<CarriesDependencyAttr>() &&
2147 !oldDecl->hasAttr<CarriesDependencyAttr>()) {
2148 S.Diag(newDecl->getAttr<CarriesDependencyAttr>()->getLocation(),
2149 diag::err_carries_dependency_missing_on_first_decl) << 1/*Param*/;
2150 // Find the first declaration of the parameter.
2151 // FIXME: Should we build redeclaration chains for function parameters?
2152 const FunctionDecl *FirstFD =
2153 cast<FunctionDecl>(oldDecl->getDeclContext())->getFirstDeclaration();
2154 const ParmVarDecl *FirstVD =
2155 FirstFD->getParamDecl(oldDecl->getFunctionScopeIndex());
2156 S.Diag(FirstVD->getLocation(),
2157 diag::note_carries_dependency_missing_first_decl) << 1/*Param*/;
2160 if (!oldDecl->hasAttrs())
2163 bool foundAny = newDecl->hasAttrs();
2165 // Ensure that any moving of objects within the allocated map is
2166 // done before we process them.
2167 if (!foundAny) newDecl->setAttrs(AttrVec());
2169 for (specific_attr_iterator<InheritableParamAttr>
2170 i = oldDecl->specific_attr_begin<InheritableParamAttr>(),
2171 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) {
2172 if (!DeclHasAttr(newDecl, *i)) {
2173 InheritableAttr *newAttr =
2174 cast<InheritableParamAttr>((*i)->clone(S.Context));
2175 newAttr->setInherited(true);
2176 newDecl->addAttr(newAttr);
2181 if (!foundAny) newDecl->dropAttrs();
2186 /// Used in MergeFunctionDecl to keep track of function parameters in
2188 struct GNUCompatibleParamWarning {
2189 ParmVarDecl *OldParm;
2190 ParmVarDecl *NewParm;
2191 QualType PromotedType;
2196 /// getSpecialMember - get the special member enum for a method.
2197 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
2198 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
2199 if (Ctor->isDefaultConstructor())
2200 return Sema::CXXDefaultConstructor;
2202 if (Ctor->isCopyConstructor())
2203 return Sema::CXXCopyConstructor;
2205 if (Ctor->isMoveConstructor())
2206 return Sema::CXXMoveConstructor;
2207 } else if (isa<CXXDestructorDecl>(MD)) {
2208 return Sema::CXXDestructor;
2209 } else if (MD->isCopyAssignmentOperator()) {
2210 return Sema::CXXCopyAssignment;
2211 } else if (MD->isMoveAssignmentOperator()) {
2212 return Sema::CXXMoveAssignment;
2215 return Sema::CXXInvalid;
2218 /// canRedefineFunction - checks if a function can be redefined. Currently,
2219 /// only extern inline functions can be redefined, and even then only in
2221 static bool canRedefineFunction(const FunctionDecl *FD,
2222 const LangOptions& LangOpts) {
2223 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
2224 !LangOpts.CPlusPlus &&
2225 FD->isInlineSpecified() &&
2226 FD->getStorageClass() == SC_Extern);
2229 /// Is the given calling convention the ABI default for the given
2231 static bool isABIDefaultCC(Sema &S, CallingConv CC, FunctionDecl *D) {
2232 CallingConv ABIDefaultCC;
2233 if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
2234 ABIDefaultCC = S.Context.getDefaultCXXMethodCallConv(D->isVariadic());
2236 // Free C function or a static method.
2237 ABIDefaultCC = (S.Context.getLangOpts().MRTD ? CC_X86StdCall : CC_C);
2239 return ABIDefaultCC == CC;
2242 template <typename T>
2243 static bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) {
2244 const DeclContext *DC = Old->getDeclContext();
2248 LanguageLinkage OldLinkage = Old->getLanguageLinkage();
2249 if (OldLinkage == CXXLanguageLinkage && New->isInExternCContext())
2251 if (OldLinkage == CLanguageLinkage && New->isInExternCXXContext())
2256 /// MergeFunctionDecl - We just parsed a function 'New' from
2257 /// declarator D which has the same name and scope as a previous
2258 /// declaration 'Old'. Figure out how to resolve this situation,
2259 /// merging decls or emitting diagnostics as appropriate.
2261 /// In C++, New and Old must be declarations that are not
2262 /// overloaded. Use IsOverload to determine whether New and Old are
2263 /// overloaded, and to select the Old declaration that New should be
2266 /// Returns true if there was an error, false otherwise.
2267 bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) {
2268 // Verify the old decl was also a function.
2269 FunctionDecl *Old = 0;
2270 if (FunctionTemplateDecl *OldFunctionTemplate
2271 = dyn_cast<FunctionTemplateDecl>(OldD))
2272 Old = OldFunctionTemplate->getTemplatedDecl();
2274 Old = dyn_cast<FunctionDecl>(OldD);
2276 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
2277 if (New->getFriendObjectKind()) {
2278 Diag(New->getLocation(), diag::err_using_decl_friend);
2279 Diag(Shadow->getTargetDecl()->getLocation(),
2280 diag::note_using_decl_target);
2281 Diag(Shadow->getUsingDecl()->getLocation(),
2282 diag::note_using_decl) << 0;
2286 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
2287 Diag(Shadow->getTargetDecl()->getLocation(),
2288 diag::note_using_decl_target);
2289 Diag(Shadow->getUsingDecl()->getLocation(),
2290 diag::note_using_decl) << 0;
2294 Diag(New->getLocation(), diag::err_redefinition_different_kind)
2295 << New->getDeclName();
2296 Diag(OldD->getLocation(), diag::note_previous_definition);
2300 // Determine whether the previous declaration was a definition,
2301 // implicit declaration, or a declaration.
2302 diag::kind PrevDiag;
2303 if (Old->isThisDeclarationADefinition())
2304 PrevDiag = diag::note_previous_definition;
2305 else if (Old->isImplicit())
2306 PrevDiag = diag::note_previous_implicit_declaration;
2308 PrevDiag = diag::note_previous_declaration;
2310 QualType OldQType = Context.getCanonicalType(Old->getType());
2311 QualType NewQType = Context.getCanonicalType(New->getType());
2313 // Don't complain about this if we're in GNU89 mode and the old function
2314 // is an extern inline function.
2315 // Don't complain about specializations. They are not supposed to have
2317 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
2318 New->getStorageClass() == SC_Static &&
2319 isExternalLinkage(Old->getLinkage()) &&
2320 !New->getTemplateSpecializationInfo() &&
2321 !canRedefineFunction(Old, getLangOpts())) {
2322 if (getLangOpts().MicrosoftExt) {
2323 Diag(New->getLocation(), diag::warn_static_non_static) << New;
2324 Diag(Old->getLocation(), PrevDiag);
2326 Diag(New->getLocation(), diag::err_static_non_static) << New;
2327 Diag(Old->getLocation(), PrevDiag);
2332 // If a function is first declared with a calling convention, but is
2333 // later declared or defined without one, the second decl assumes the
2334 // calling convention of the first.
2336 // It's OK if a function is first declared without a calling convention,
2337 // but is later declared or defined with the default calling convention.
2339 // For the new decl, we have to look at the NON-canonical type to tell the
2340 // difference between a function that really doesn't have a calling
2341 // convention and one that is declared cdecl. That's because in
2342 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
2343 // because it is the default calling convention.
2345 // Note also that we DO NOT return at this point, because we still have
2346 // other tests to run.
2347 const FunctionType *OldType = cast<FunctionType>(OldQType);
2348 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
2349 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
2350 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
2351 bool RequiresAdjustment = false;
2352 if (OldTypeInfo.getCC() == NewTypeInfo.getCC()) {
2353 // Fast path: nothing to do.
2355 // Inherit the CC from the previous declaration if it was specified
2356 // there but not here.
2357 } else if (NewTypeInfo.getCC() == CC_Default) {
2358 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
2359 RequiresAdjustment = true;
2361 // Don't complain about mismatches when the default CC is
2362 // effectively the same as the explict one. Only Old decl contains correct
2363 // information about storage class of CXXMethod.
2364 } else if (OldTypeInfo.getCC() == CC_Default &&
2365 isABIDefaultCC(*this, NewTypeInfo.getCC(), Old)) {
2366 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
2367 RequiresAdjustment = true;
2369 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
2370 NewTypeInfo.getCC())) {
2371 // Calling conventions really aren't compatible, so complain.
2372 Diag(New->getLocation(), diag::err_cconv_change)
2373 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
2374 << (OldTypeInfo.getCC() == CC_Default)
2375 << (OldTypeInfo.getCC() == CC_Default ? "" :
2376 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
2377 Diag(Old->getLocation(), diag::note_previous_declaration);
2381 // FIXME: diagnose the other way around?
2382 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
2383 NewTypeInfo = NewTypeInfo.withNoReturn(true);
2384 RequiresAdjustment = true;
2387 // Merge regparm attribute.
2388 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
2389 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
2390 if (NewTypeInfo.getHasRegParm()) {
2391 Diag(New->getLocation(), diag::err_regparm_mismatch)
2392 << NewType->getRegParmType()
2393 << OldType->getRegParmType();
2394 Diag(Old->getLocation(), diag::note_previous_declaration);
2398 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
2399 RequiresAdjustment = true;
2402 // Merge ns_returns_retained attribute.
2403 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
2404 if (NewTypeInfo.getProducesResult()) {
2405 Diag(New->getLocation(), diag::err_returns_retained_mismatch);
2406 Diag(Old->getLocation(), diag::note_previous_declaration);
2410 NewTypeInfo = NewTypeInfo.withProducesResult(true);
2411 RequiresAdjustment = true;
2414 if (RequiresAdjustment) {
2415 NewType = Context.adjustFunctionType(NewType, NewTypeInfo);
2416 New->setType(QualType(NewType, 0));
2417 NewQType = Context.getCanonicalType(New->getType());
2420 // If this redeclaration makes the function inline, we may need to add it to
2421 // UndefinedButUsed.
2422 if (!Old->isInlined() && New->isInlined() &&
2423 !New->hasAttr<GNUInlineAttr>() &&
2424 (getLangOpts().CPlusPlus || !getLangOpts().GNUInline) &&
2425 Old->isUsed(false) &&
2426 !Old->isDefined() && !New->isThisDeclarationADefinition())
2427 UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(),
2430 // If this redeclaration makes it newly gnu_inline, we don't want to warn
2432 if (New->hasAttr<GNUInlineAttr>() &&
2433 Old->isInlined() && !Old->hasAttr<GNUInlineAttr>()) {
2434 UndefinedButUsed.erase(Old->getCanonicalDecl());
2437 if (getLangOpts().CPlusPlus) {
2439 // Certain function declarations cannot be overloaded:
2440 // -- Function declarations that differ only in the return type
2441 // cannot be overloaded.
2443 // Go back to the type source info to compare the declared return types,
2444 // per C++1y [dcl.type.auto]p??:
2445 // Redeclarations or specializations of a function or function template
2446 // with a declared return type that uses a placeholder type shall also
2447 // use that placeholder, not a deduced type.
2448 QualType OldDeclaredReturnType = (Old->getTypeSourceInfo()
2449 ? Old->getTypeSourceInfo()->getType()->castAs<FunctionType>()
2450 : OldType)->getResultType();
2451 QualType NewDeclaredReturnType = (New->getTypeSourceInfo()
2452 ? New->getTypeSourceInfo()->getType()->castAs<FunctionType>()
2453 : NewType)->getResultType();
2455 if (!Context.hasSameType(OldDeclaredReturnType, NewDeclaredReturnType)) {
2456 if (NewDeclaredReturnType->isObjCObjectPointerType() &&
2457 OldDeclaredReturnType->isObjCObjectPointerType())
2458 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
2459 if (ResQT.isNull()) {
2460 if (New->isCXXClassMember() && New->isOutOfLine())
2461 Diag(New->getLocation(),
2462 diag::err_member_def_does_not_match_ret_type) << New;
2464 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
2465 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2472 QualType OldReturnType = OldType->getResultType();
2473 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType();
2474 if (OldReturnType != NewReturnType) {
2475 // If this function has a deduced return type and has already been
2476 // defined, copy the deduced value from the old declaration.
2477 AutoType *OldAT = Old->getResultType()->getContainedAutoType();
2478 if (OldAT && OldAT->isDeduced()) {
2479 New->setType(SubstAutoType(New->getType(), OldAT->getDeducedType()));
2480 NewQType = Context.getCanonicalType(
2481 SubstAutoType(NewQType, OldAT->getDeducedType()));
2485 const CXXMethodDecl *OldMethod = dyn_cast<CXXMethodDecl>(Old);
2486 CXXMethodDecl *NewMethod = dyn_cast<CXXMethodDecl>(New);
2487 if (OldMethod && NewMethod) {
2488 // Preserve triviality.
2489 NewMethod->setTrivial(OldMethod->isTrivial());
2491 // MSVC allows explicit template specialization at class scope:
2492 // 2 CXMethodDecls referring to the same function will be injected.
2493 // We don't want a redeclartion error.
2494 bool IsClassScopeExplicitSpecialization =
2495 OldMethod->isFunctionTemplateSpecialization() &&
2496 NewMethod->isFunctionTemplateSpecialization();
2497 bool isFriend = NewMethod->getFriendObjectKind();
2499 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
2500 !IsClassScopeExplicitSpecialization) {
2501 // -- Member function declarations with the same name and the
2502 // same parameter types cannot be overloaded if any of them
2503 // is a static member function declaration.
2504 if (OldMethod->isStatic() || NewMethod->isStatic()) {
2505 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
2506 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2510 // C++ [class.mem]p1:
2511 // [...] A member shall not be declared twice in the
2512 // member-specification, except that a nested class or member
2513 // class template can be declared and then later defined.
2514 if (ActiveTemplateInstantiations.empty()) {
2516 if (isa<CXXConstructorDecl>(OldMethod))
2517 NewDiag = diag::err_constructor_redeclared;
2518 else if (isa<CXXDestructorDecl>(NewMethod))
2519 NewDiag = diag::err_destructor_redeclared;
2520 else if (isa<CXXConversionDecl>(NewMethod))
2521 NewDiag = diag::err_conv_function_redeclared;
2523 NewDiag = diag::err_member_redeclared;
2525 Diag(New->getLocation(), NewDiag);
2527 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation)
2528 << New << New->getType();
2530 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2532 // Complain if this is an explicit declaration of a special
2533 // member that was initially declared implicitly.
2535 // As an exception, it's okay to befriend such methods in order
2536 // to permit the implicit constructor/destructor/operator calls.
2537 } else if (OldMethod->isImplicit()) {
2539 NewMethod->setImplicit();
2541 Diag(NewMethod->getLocation(),
2542 diag::err_definition_of_implicitly_declared_member)
2543 << New << getSpecialMember(OldMethod);
2546 } else if (OldMethod->isExplicitlyDefaulted() && !isFriend) {
2547 Diag(NewMethod->getLocation(),
2548 diag::err_definition_of_explicitly_defaulted_member)
2549 << getSpecialMember(OldMethod);
2554 // C++11 [dcl.attr.noreturn]p1:
2555 // The first declaration of a function shall specify the noreturn
2556 // attribute if any declaration of that function specifies the noreturn
2558 if (New->hasAttr<CXX11NoReturnAttr>() &&
2559 !Old->hasAttr<CXX11NoReturnAttr>()) {
2560 Diag(New->getAttr<CXX11NoReturnAttr>()->getLocation(),
2561 diag::err_noreturn_missing_on_first_decl);
2562 Diag(Old->getFirstDeclaration()->getLocation(),
2563 diag::note_noreturn_missing_first_decl);
2566 // C++11 [dcl.attr.depend]p2:
2567 // The first declaration of a function shall specify the
2568 // carries_dependency attribute for its declarator-id if any declaration
2569 // of the function specifies the carries_dependency attribute.
2570 if (New->hasAttr<CarriesDependencyAttr>() &&
2571 !Old->hasAttr<CarriesDependencyAttr>()) {
2572 Diag(New->getAttr<CarriesDependencyAttr>()->getLocation(),
2573 diag::err_carries_dependency_missing_on_first_decl) << 0/*Function*/;
2574 Diag(Old->getFirstDeclaration()->getLocation(),
2575 diag::note_carries_dependency_missing_first_decl) << 0/*Function*/;
2579 // All declarations for a function shall agree exactly in both the
2580 // return type and the parameter-type-list.
2581 // We also want to respect all the extended bits except noreturn.
2583 // noreturn should now match unless the old type info didn't have it.
2584 QualType OldQTypeForComparison = OldQType;
2585 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
2586 assert(OldQType == QualType(OldType, 0));
2587 const FunctionType *OldTypeForComparison
2588 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
2589 OldQTypeForComparison = QualType(OldTypeForComparison, 0);
2590 assert(OldQTypeForComparison.isCanonical());
2593 if (haveIncompatibleLanguageLinkages(Old, New)) {
2594 Diag(New->getLocation(), diag::err_different_language_linkage) << New;
2595 Diag(Old->getLocation(), PrevDiag);
2599 if (OldQTypeForComparison == NewQType)
2600 return MergeCompatibleFunctionDecls(New, Old, S);
2602 // Fall through for conflicting redeclarations and redefinitions.
2605 // C: Function types need to be compatible, not identical. This handles
2606 // duplicate function decls like "void f(int); void f(enum X);" properly.
2607 if (!getLangOpts().CPlusPlus &&
2608 Context.typesAreCompatible(OldQType, NewQType)) {
2609 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
2610 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
2611 const FunctionProtoType *OldProto = 0;
2612 if (isa<FunctionNoProtoType>(NewFuncType) &&
2613 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
2614 // The old declaration provided a function prototype, but the
2615 // new declaration does not. Merge in the prototype.
2616 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
2617 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
2618 OldProto->arg_type_end());
2619 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
2621 OldProto->getExtProtoInfo());
2622 New->setType(NewQType);
2623 New->setHasInheritedPrototype();
2625 // Synthesize a parameter for each argument type.
2626 SmallVector<ParmVarDecl*, 16> Params;
2627 for (FunctionProtoType::arg_type_iterator
2628 ParamType = OldProto->arg_type_begin(),
2629 ParamEnd = OldProto->arg_type_end();
2630 ParamType != ParamEnd; ++ParamType) {
2631 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
2633 SourceLocation(), 0,
2634 *ParamType, /*TInfo=*/0,
2637 Param->setScopeInfo(0, Params.size());
2638 Param->setImplicit();
2639 Params.push_back(Param);
2642 New->setParams(Params);
2645 return MergeCompatibleFunctionDecls(New, Old, S);
2648 // GNU C permits a K&R definition to follow a prototype declaration
2649 // if the declared types of the parameters in the K&R definition
2650 // match the types in the prototype declaration, even when the
2651 // promoted types of the parameters from the K&R definition differ
2652 // from the types in the prototype. GCC then keeps the types from
2655 // If a variadic prototype is followed by a non-variadic K&R definition,
2656 // the K&R definition becomes variadic. This is sort of an edge case, but
2657 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
2659 if (!getLangOpts().CPlusPlus &&
2660 Old->hasPrototype() && !New->hasPrototype() &&
2661 New->getType()->getAs<FunctionProtoType>() &&
2662 Old->getNumParams() == New->getNumParams()) {
2663 SmallVector<QualType, 16> ArgTypes;
2664 SmallVector<GNUCompatibleParamWarning, 16> Warnings;
2665 const FunctionProtoType *OldProto
2666 = Old->getType()->getAs<FunctionProtoType>();
2667 const FunctionProtoType *NewProto
2668 = New->getType()->getAs<FunctionProtoType>();
2670 // Determine whether this is the GNU C extension.
2671 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
2672 NewProto->getResultType());
2673 bool LooseCompatible = !MergedReturn.isNull();
2674 for (unsigned Idx = 0, End = Old->getNumParams();
2675 LooseCompatible && Idx != End; ++Idx) {
2676 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
2677 ParmVarDecl *NewParm = New->getParamDecl(Idx);
2678 if (Context.typesAreCompatible(OldParm->getType(),
2679 NewProto->getArgType(Idx))) {
2680 ArgTypes.push_back(NewParm->getType());
2681 } else if (Context.typesAreCompatible(OldParm->getType(),
2683 /*CompareUnqualified=*/true)) {
2684 GNUCompatibleParamWarning Warn
2685 = { OldParm, NewParm, NewProto->getArgType(Idx) };
2686 Warnings.push_back(Warn);
2687 ArgTypes.push_back(NewParm->getType());
2689 LooseCompatible = false;
2692 if (LooseCompatible) {
2693 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
2694 Diag(Warnings[Warn].NewParm->getLocation(),
2695 diag::ext_param_promoted_not_compatible_with_prototype)
2696 << Warnings[Warn].PromotedType
2697 << Warnings[Warn].OldParm->getType();
2698 if (Warnings[Warn].OldParm->getLocation().isValid())
2699 Diag(Warnings[Warn].OldParm->getLocation(),
2700 diag::note_previous_declaration);
2703 New->setType(Context.getFunctionType(MergedReturn, ArgTypes,
2704 OldProto->getExtProtoInfo()));
2705 return MergeCompatibleFunctionDecls(New, Old, S);
2708 // Fall through to diagnose conflicting types.
2711 // A function that has already been declared has been redeclared or
2712 // defined with a different type; show an appropriate diagnostic.
2714 // If the previous declaration was an implicitly-generated builtin
2715 // declaration, then at the very least we should use a specialized note.
2717 if (Old->isImplicit() && (BuiltinID = Old->getBuiltinID())) {
2718 // If it's actually a library-defined builtin function like 'malloc'
2719 // or 'printf', just warn about the incompatible redeclaration.
2720 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
2721 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
2722 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
2723 << Old << Old->getType();
2725 // If this is a global redeclaration, just forget hereafter
2726 // about the "builtin-ness" of the function.
2728 // Doing this for local extern declarations is problematic. If
2729 // the builtin declaration remains visible, a second invalid
2730 // local declaration will produce a hard error; if it doesn't
2731 // remain visible, a single bogus local redeclaration (which is
2732 // actually only a warning) could break all the downstream code.
2733 if (!New->getDeclContext()->isFunctionOrMethod())
2734 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
2739 PrevDiag = diag::note_previous_builtin_declaration;
2742 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
2743 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2747 /// \brief Completes the merge of two function declarations that are
2748 /// known to be compatible.
2750 /// This routine handles the merging of attributes and other
2751 /// properties of function declarations form the old declaration to
2752 /// the new declaration, once we know that New is in fact a
2753 /// redeclaration of Old.
2756 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
2758 // Merge the attributes
2759 mergeDeclAttributes(New, Old);
2761 // Merge "pure" flag.
2765 // Merge "used" flag.
2766 if (Old->isUsed(false))
2769 // Merge attributes from the parameters. These can mismatch with K&R
2771 if (New->getNumParams() == Old->getNumParams())
2772 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i)
2773 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i),
2776 if (getLangOpts().CPlusPlus)
2777 return MergeCXXFunctionDecl(New, Old, S);
2779 // Merge the function types so the we get the composite types for the return
2780 // and argument types.
2781 QualType Merged = Context.mergeTypes(Old->getType(), New->getType());
2782 if (!Merged.isNull())
2783 New->setType(Merged);
2789 void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
2790 ObjCMethodDecl *oldMethod) {
2792 // Merge the attributes, including deprecated/unavailable
2793 AvailabilityMergeKind MergeKind =
2794 isa<ObjCImplDecl>(newMethod->getDeclContext()) ? AMK_Redeclaration
2796 mergeDeclAttributes(newMethod, oldMethod, MergeKind);
2798 // Merge attributes from the parameters.
2799 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(),
2800 oe = oldMethod->param_end();
2801 for (ObjCMethodDecl::param_iterator
2802 ni = newMethod->param_begin(), ne = newMethod->param_end();
2803 ni != ne && oi != oe; ++ni, ++oi)
2804 mergeParamDeclAttributes(*ni, *oi, *this);
2806 CheckObjCMethodOverride(newMethod, oldMethod);
2809 /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
2810 /// scope as a previous declaration 'Old'. Figure out how to merge their types,
2811 /// emitting diagnostics as appropriate.
2813 /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
2814 /// to here in AddInitializerToDecl. We can't check them before the initializer
2816 void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old, bool OldWasHidden) {
2817 if (New->isInvalidDecl() || Old->isInvalidDecl())
2821 if (getLangOpts().CPlusPlus) {
2822 if (New->getType()->isUndeducedType()) {
2823 // We don't know what the new type is until the initializer is attached.
2825 } else if (Context.hasSameType(New->getType(), Old->getType())) {
2826 // These could still be something that needs exception specs checked.
2827 return MergeVarDeclExceptionSpecs(New, Old);
2829 // C++ [basic.link]p10:
2830 // [...] the types specified by all declarations referring to a given
2831 // object or function shall be identical, except that declarations for an
2832 // array object can specify array types that differ by the presence or
2833 // absence of a major array bound (8.3.4).
2834 else if (Old->getType()->isIncompleteArrayType() &&
2835 New->getType()->isArrayType()) {
2836 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
2837 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
2838 if (Context.hasSameType(OldArray->getElementType(),
2839 NewArray->getElementType()))
2840 MergedT = New->getType();
2841 } else if (Old->getType()->isArrayType() &&
2842 New->getType()->isIncompleteArrayType()) {
2843 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
2844 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
2845 if (Context.hasSameType(OldArray->getElementType(),
2846 NewArray->getElementType()))
2847 MergedT = Old->getType();
2848 } else if (New->getType()->isObjCObjectPointerType()
2849 && Old->getType()->isObjCObjectPointerType()) {
2850 MergedT = Context.mergeObjCGCQualifiers(New->getType(),
2854 MergedT = Context.mergeTypes(New->getType(), Old->getType());
2856 if (MergedT.isNull()) {
2857 Diag(New->getLocation(), diag::err_redefinition_different_type)
2858 << New->getDeclName() << New->getType() << Old->getType();
2859 Diag(Old->getLocation(), diag::note_previous_definition);
2860 return New->setInvalidDecl();
2863 // Don't actually update the type on the new declaration if the old
2864 // declaration was a extern declaration in a different scope.
2866 New->setType(MergedT);
2869 /// MergeVarDecl - We just parsed a variable 'New' which has the same name
2870 /// and scope as a previous declaration 'Old'. Figure out how to resolve this
2871 /// situation, merging decls or emitting diagnostics as appropriate.
2873 /// Tentative definition rules (C99 6.9.2p2) are checked by
2874 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
2875 /// definitions here, since the initializer hasn't been attached.
2877 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous,
2878 bool PreviousWasHidden) {
2879 // If the new decl is already invalid, don't do any other checking.
2880 if (New->isInvalidDecl())
2883 // Verify the old decl was also a variable.
2885 if (!Previous.isSingleResult() ||
2886 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
2887 Diag(New->getLocation(), diag::err_redefinition_different_kind)
2888 << New->getDeclName();
2889 Diag(Previous.getRepresentativeDecl()->getLocation(),
2890 diag::note_previous_definition);
2891 return New->setInvalidDecl();
2894 if (!shouldLinkPossiblyHiddenDecl(Old, New))
2897 // C++ [class.mem]p1:
2898 // A member shall not be declared twice in the member-specification [...]
2900 // Here, we need only consider static data members.
2901 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
2902 Diag(New->getLocation(), diag::err_duplicate_member)
2903 << New->getIdentifier();
2904 Diag(Old->getLocation(), diag::note_previous_declaration);
2905 New->setInvalidDecl();
2908 mergeDeclAttributes(New, Old);
2909 // Warn if an already-declared variable is made a weak_import in a subsequent
2911 if (New->getAttr<WeakImportAttr>() &&
2912 Old->getStorageClass() == SC_None &&
2913 !Old->getAttr<WeakImportAttr>()) {
2914 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
2915 Diag(Old->getLocation(), diag::note_previous_definition);
2916 // Remove weak_import attribute on new declaration.
2917 New->dropAttr<WeakImportAttr>();
2921 MergeVarDeclTypes(New, Old, PreviousWasHidden);
2922 if (New->isInvalidDecl())
2925 // [dcl.stc]p8: Check if we have a non-static decl followed by a static.
2926 if (New->getStorageClass() == SC_Static &&
2927 !New->isStaticDataMember() &&
2928 isExternalLinkage(Old->getLinkage())) {
2929 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
2930 Diag(Old->getLocation(), diag::note_previous_definition);
2931 return New->setInvalidDecl();
2934 // For an identifier declared with the storage-class specifier
2935 // extern in a scope in which a prior declaration of that
2936 // identifier is visible,23) if the prior declaration specifies
2937 // internal or external linkage, the linkage of the identifier at
2938 // the later declaration is the same as the linkage specified at
2939 // the prior declaration. If no prior declaration is visible, or
2940 // if the prior declaration specifies no linkage, then the
2941 // identifier has external linkage.
2942 if (New->hasExternalStorage() && Old->hasLinkage())
2944 else if (New->getCanonicalDecl()->getStorageClass() != SC_Static &&
2945 !New->isStaticDataMember() &&
2946 Old->getCanonicalDecl()->getStorageClass() == SC_Static) {
2947 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
2948 Diag(Old->getLocation(), diag::note_previous_definition);
2949 return New->setInvalidDecl();
2952 // Check if extern is followed by non-extern and vice-versa.
2953 if (New->hasExternalStorage() &&
2954 !Old->hasLinkage() && Old->isLocalVarDecl()) {
2955 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
2956 Diag(Old->getLocation(), diag::note_previous_definition);
2957 return New->setInvalidDecl();
2959 if (Old->hasLinkage() && New->isLocalVarDecl() &&
2960 !New->hasExternalStorage()) {
2961 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
2962 Diag(Old->getLocation(), diag::note_previous_definition);
2963 return New->setInvalidDecl();
2966 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
2968 // FIXME: The test for external storage here seems wrong? We still
2969 // need to check for mismatches.
2970 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
2971 // Don't complain about out-of-line definitions of static members.
2972 !(Old->getLexicalDeclContext()->isRecord() &&
2973 !New->getLexicalDeclContext()->isRecord())) {
2974 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
2975 Diag(Old->getLocation(), diag::note_previous_definition);
2976 return New->setInvalidDecl();
2979 if (New->getTLSKind() != Old->getTLSKind()) {
2980 if (!Old->getTLSKind()) {
2981 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
2982 Diag(Old->getLocation(), diag::note_previous_declaration);
2983 } else if (!New->getTLSKind()) {
2984 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
2985 Diag(Old->getLocation(), diag::note_previous_declaration);
2987 // Do not allow redeclaration to change the variable between requiring
2988 // static and dynamic initialization.
2989 // FIXME: GCC allows this, but uses the TLS keyword on the first
2990 // declaration to determine the kind. Do we need to be compatible here?
2991 Diag(New->getLocation(), diag::err_thread_thread_different_kind)
2992 << New->getDeclName() << (New->getTLSKind() == VarDecl::TLS_Dynamic);
2993 Diag(Old->getLocation(), diag::note_previous_declaration);
2997 // C++ doesn't have tentative definitions, so go right ahead and check here.
2999 if (getLangOpts().CPlusPlus &&
3000 New->isThisDeclarationADefinition() == VarDecl::Definition &&
3001 (Def = Old->getDefinition())) {
3002 Diag(New->getLocation(), diag::err_redefinition)
3003 << New->getDeclName();
3004 Diag(Def->getLocation(), diag::note_previous_definition);
3005 New->setInvalidDecl();
3009 if (haveIncompatibleLanguageLinkages(Old, New)) {
3010 Diag(New->getLocation(), diag::err_different_language_linkage) << New;
3011 Diag(Old->getLocation(), diag::note_previous_definition);
3012 New->setInvalidDecl();
3016 // Merge "used" flag.
3017 if (Old->isUsed(false))
3020 // Keep a chain of previous declarations.
3021 New->setPreviousDeclaration(Old);
3023 // Inherit access appropriately.
3024 New->setAccess(Old->getAccess());
3027 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
3028 /// no declarator (e.g. "struct foo;") is parsed.
3029 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
3031 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg());
3034 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
3035 /// no declarator (e.g. "struct foo;") is parsed. It also accepts template
3036 /// parameters to cope with template friend declarations.
3037 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
3039 MultiTemplateParamsArg TemplateParams,
3040 bool IsExplicitInstantiation) {
3043 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
3044 DS.getTypeSpecType() == DeclSpec::TST_struct ||
3045 DS.getTypeSpecType() == DeclSpec::TST_interface ||
3046 DS.getTypeSpecType() == DeclSpec::TST_union ||
3047 DS.getTypeSpecType() == DeclSpec::TST_enum) {
3048 TagD = DS.getRepAsDecl();
3050 if (!TagD) // We probably had an error
3053 // Note that the above type specs guarantee that the
3054 // type rep is a Decl, whereas in many of the others
3056 if (isa<TagDecl>(TagD))
3057 Tag = cast<TagDecl>(TagD);
3058 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD))
3059 Tag = CTD->getTemplatedDecl();
3063 getASTContext().addUnnamedTag(Tag);
3064 Tag->setFreeStanding();
3065 if (Tag->isInvalidDecl())
3069 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
3070 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
3071 // or incomplete types shall not be restrict-qualified."
3072 if (TypeQuals & DeclSpec::TQ_restrict)
3073 Diag(DS.getRestrictSpecLoc(),
3074 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
3075 << DS.getSourceRange();
3078 if (DS.isConstexprSpecified()) {
3079 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
3080 // and definitions of functions and variables.
3082 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
3083 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
3084 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
3085 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 :
3086 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4);
3088 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
3089 // Don't emit warnings after this error.
3093 DiagnoseFunctionSpecifiers(DS);
3095 if (DS.isFriendSpecified()) {
3096 // If we're dealing with a decl but not a TagDecl, assume that
3097 // whatever routines created it handled the friendship aspect.
3100 return ActOnFriendTypeDecl(S, DS, TemplateParams);
3103 CXXScopeSpec &SS = DS.getTypeSpecScope();
3104 bool IsExplicitSpecialization =
3105 !TemplateParams.empty() && TemplateParams.back()->size() == 0;
3106 if (Tag && SS.isNotEmpty() && !Tag->isCompleteDefinition() &&
3107 !IsExplicitInstantiation && !IsExplicitSpecialization) {
3108 // Per C++ [dcl.type.elab]p1, a class declaration cannot have a
3109 // nested-name-specifier unless it is an explicit instantiation
3110 // or an explicit specialization.
3111 // Per C++ [dcl.enum]p1, an opaque-enum-declaration can't either.
3112 Diag(SS.getBeginLoc(), diag::err_standalone_class_nested_name_specifier)
3113 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
3114 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
3115 DS.getTypeSpecType() == DeclSpec::TST_interface ? 2 :
3116 DS.getTypeSpecType() == DeclSpec::TST_union ? 3 : 4)
3121 // Track whether this decl-specifier declares anything.
3122 bool DeclaresAnything = true;
3124 // Handle anonymous struct definitions.
3125 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
3126 if (!Record->getDeclName() && Record->isCompleteDefinition() &&
3127 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
3128 if (getLangOpts().CPlusPlus ||
3129 Record->getDeclContext()->isRecord())
3130 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
3132 DeclaresAnything = false;
3136 // Check for Microsoft C extension: anonymous struct member.
3137 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus &&
3138 CurContext->isRecord() &&
3139 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
3140 // Handle 2 kinds of anonymous struct:
3143 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
3144 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag);
3145 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) ||
3146 (DS.getTypeSpecType() == DeclSpec::TST_typename &&
3147 DS.getRepAsType().get()->isStructureType())) {
3148 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct)
3149 << DS.getSourceRange();
3150 return BuildMicrosoftCAnonymousStruct(S, DS, Record);
3154 // Skip all the checks below if we have a type error.
3155 if (DS.getTypeSpecType() == DeclSpec::TST_error ||
3156 (TagD && TagD->isInvalidDecl()))
3159 if (getLangOpts().CPlusPlus &&
3160 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
3161 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
3162 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
3163 !Enum->getIdentifier() && !Enum->isInvalidDecl())
3164 DeclaresAnything = false;
3166 if (!DS.isMissingDeclaratorOk()) {
3167 // Customize diagnostic for a typedef missing a name.
3168 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
3169 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name)
3170 << DS.getSourceRange();
3172 DeclaresAnything = false;
3175 if (DS.isModulePrivateSpecified() &&
3176 Tag && Tag->getDeclContext()->isFunctionOrMethod())
3177 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
3178 << Tag->getTagKind()
3179 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
3181 ActOnDocumentableDecl(TagD);
3184 // A declaration [...] shall declare at least a declarator [...], a tag,
3185 // or the members of an enumeration.
3187 // [If there are no declarators], and except for the declaration of an
3188 // unnamed bit-field, the decl-specifier-seq shall introduce one or more
3189 // names into the program, or shall redeclare a name introduced by a
3190 // previous declaration.
3191 if (!DeclaresAnything) {
3192 // In C, we allow this as a (popular) extension / bug. Don't bother
3193 // producing further diagnostics for redundant qualifiers after this.
3194 Diag(DS.getLocStart(), diag::ext_no_declarators) << DS.getSourceRange();
3199 // If a storage-class-specifier appears in a decl-specifier-seq, [...] the
3200 // init-declarator-list of the declaration shall not be empty.
3201 // C++ [dcl.fct.spec]p1:
3202 // If a cv-qualifier appears in a decl-specifier-seq, the
3203 // init-declarator-list of the declaration shall not be empty.
3205 // Spurious qualifiers here appear to be valid in C.
3206 unsigned DiagID = diag::warn_standalone_specifier;
3207 if (getLangOpts().CPlusPlus)
3208 DiagID = diag::ext_standalone_specifier;
3210 // Note that a linkage-specification sets a storage class, but
3211 // 'extern "C" struct foo;' is actually valid and not theoretically
3213 if (DeclSpec::SCS SCS = DS.getStorageClassSpec())
3214 if (!DS.isExternInLinkageSpec() && SCS != DeclSpec::SCS_typedef)
3215 Diag(DS.getStorageClassSpecLoc(), DiagID)
3216 << DeclSpec::getSpecifierName(SCS);
3218 if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
3219 Diag(DS.getThreadStorageClassSpecLoc(), DiagID)
3220 << DeclSpec::getSpecifierName(TSCS);
3221 if (DS.getTypeQualifiers()) {
3222 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
3223 Diag(DS.getConstSpecLoc(), DiagID) << "const";
3224 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
3225 Diag(DS.getConstSpecLoc(), DiagID) << "volatile";
3226 // Restrict is covered above.
3227 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
3228 Diag(DS.getAtomicSpecLoc(), DiagID) << "_Atomic";
3231 // Warn about ignored type attributes, for example:
3232 // __attribute__((aligned)) struct A;
3233 // Attributes should be placed after tag to apply to type declaration.
3234 if (!DS.getAttributes().empty()) {
3235 DeclSpec::TST TypeSpecType = DS.getTypeSpecType();
3236 if (TypeSpecType == DeclSpec::TST_class ||
3237 TypeSpecType == DeclSpec::TST_struct ||
3238 TypeSpecType == DeclSpec::TST_interface ||
3239 TypeSpecType == DeclSpec::TST_union ||
3240 TypeSpecType == DeclSpec::TST_enum) {
3241 AttributeList* attrs = DS.getAttributes().getList();
3243 Diag(attrs->getLoc(), diag::warn_declspec_attribute_ignored)
3245 << (TypeSpecType == DeclSpec::TST_class ? 0 :
3246 TypeSpecType == DeclSpec::TST_struct ? 1 :
3247 TypeSpecType == DeclSpec::TST_union ? 2 :
3248 TypeSpecType == DeclSpec::TST_interface ? 3 : 4);
3249 attrs = attrs->getNext();
3257 /// We are trying to inject an anonymous member into the given scope;
3258 /// check if there's an existing declaration that can't be overloaded.
3260 /// \return true if this is a forbidden redeclaration
3261 static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
3264 DeclarationName Name,
3265 SourceLocation NameLoc,
3266 unsigned diagnostic) {
3267 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
3268 Sema::ForRedeclaration);
3269 if (!SemaRef.LookupName(R, S)) return false;
3271 if (R.getAsSingle<TagDecl>())
3274 // Pick a representative declaration.
3275 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
3276 assert(PrevDecl && "Expected a non-null Decl");
3278 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
3281 SemaRef.Diag(NameLoc, diagnostic) << Name;
3282 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
3287 /// InjectAnonymousStructOrUnionMembers - Inject the members of the
3288 /// anonymous struct or union AnonRecord into the owning context Owner
3289 /// and scope S. This routine will be invoked just after we realize
3290 /// that an unnamed union or struct is actually an anonymous union or
3297 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
3298 /// // f into the surrounding scope.x
3301 /// This routine is recursive, injecting the names of nested anonymous
3302 /// structs/unions into the owning context and scope as well.
3303 static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
3305 RecordDecl *AnonRecord,
3307 SmallVector<NamedDecl*, 2> &Chaining,
3308 bool MSAnonStruct) {
3310 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
3311 : diag::err_anonymous_struct_member_redecl;
3313 bool Invalid = false;
3315 // Look every FieldDecl and IndirectFieldDecl with a name.
3316 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(),
3317 DEnd = AnonRecord->decls_end();
3319 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) &&
3320 cast<NamedDecl>(*D)->getDeclName()) {
3321 ValueDecl *VD = cast<ValueDecl>(*D);
3322 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
3323 VD->getLocation(), diagKind)) {
3324 // C++ [class.union]p2:
3325 // The names of the members of an anonymous union shall be
3326 // distinct from the names of any other entity in the
3327 // scope in which the anonymous union is declared.
3330 // C++ [class.union]p2:
3331 // For the purpose of name lookup, after the anonymous union
3332 // definition, the members of the anonymous union are
3333 // considered to have been defined in the scope in which the
3334 // anonymous union is declared.
3335 unsigned OldChainingSize = Chaining.size();
3336 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
3337 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(),
3338 PE = IF->chain_end(); PI != PE; ++PI)
3339 Chaining.push_back(*PI);
3341 Chaining.push_back(VD);
3343 assert(Chaining.size() >= 2);
3344 NamedDecl **NamedChain =
3345 new (SemaRef.Context)NamedDecl*[Chaining.size()];
3346 for (unsigned i = 0; i < Chaining.size(); i++)
3347 NamedChain[i] = Chaining[i];
3349 IndirectFieldDecl* IndirectField =
3350 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(),
3351 VD->getIdentifier(), VD->getType(),
3352 NamedChain, Chaining.size());
3354 IndirectField->setAccess(AS);
3355 IndirectField->setImplicit();
3356 SemaRef.PushOnScopeChains(IndirectField, S);
3358 // That includes picking up the appropriate access specifier.
3359 if (AS != AS_none) IndirectField->setAccess(AS);
3361 Chaining.resize(OldChainingSize);
3369 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
3370 /// a VarDecl::StorageClass. Any error reporting is up to the caller:
3371 /// illegal input values are mapped to SC_None.
3373 StorageClassSpecToVarDeclStorageClass(const DeclSpec &DS) {
3374 DeclSpec::SCS StorageClassSpec = DS.getStorageClassSpec();
3375 assert(StorageClassSpec != DeclSpec::SCS_typedef &&
3376 "Parser allowed 'typedef' as storage class VarDecl.");
3377 switch (StorageClassSpec) {
3378 case DeclSpec::SCS_unspecified: return SC_None;
3379 case DeclSpec::SCS_extern:
3380 if (DS.isExternInLinkageSpec())
3383 case DeclSpec::SCS_static: return SC_Static;
3384 case DeclSpec::SCS_auto: return SC_Auto;
3385 case DeclSpec::SCS_register: return SC_Register;
3386 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
3387 // Illegal SCSs map to None: error reporting is up to the caller.
3388 case DeclSpec::SCS_mutable: // Fall through.
3389 case DeclSpec::SCS_typedef: return SC_None;
3391 llvm_unreachable("unknown storage class specifier");
3394 /// BuildAnonymousStructOrUnion - Handle the declaration of an
3395 /// anonymous structure or union. Anonymous unions are a C++ feature
3396 /// (C++ [class.union]) and a C11 feature; anonymous structures
3397 /// are a C11 feature and GNU C++ extension.
3398 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
3400 RecordDecl *Record) {
3401 DeclContext *Owner = Record->getDeclContext();
3403 // Diagnose whether this anonymous struct/union is an extension.
3404 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11)
3405 Diag(Record->getLocation(), diag::ext_anonymous_union);
3406 else if (!Record->isUnion() && getLangOpts().CPlusPlus)
3407 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct);
3408 else if (!Record->isUnion() && !getLangOpts().C11)
3409 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct);
3411 // C and C++ require different kinds of checks for anonymous
3413 bool Invalid = false;
3414 if (getLangOpts().CPlusPlus) {
3415 const char* PrevSpec = 0;
3417 if (Record->isUnion()) {
3418 // C++ [class.union]p6:
3419 // Anonymous unions declared in a named namespace or in the
3420 // global namespace shall be declared static.
3421 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
3422 (isa<TranslationUnitDecl>(Owner) ||
3423 (isa<NamespaceDecl>(Owner) &&
3424 cast<NamespaceDecl>(Owner)->getDeclName()))) {
3425 Diag(Record->getLocation(), diag::err_anonymous_union_not_static)
3426 << FixItHint::CreateInsertion(Record->getLocation(), "static ");
3428 // Recover by adding 'static'.
3429 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
3432 // C++ [class.union]p6:
3433 // A storage class is not allowed in a declaration of an
3434 // anonymous union in a class scope.
3435 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
3436 isa<RecordDecl>(Owner)) {
3437 Diag(DS.getStorageClassSpecLoc(),
3438 diag::err_anonymous_union_with_storage_spec)
3439 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
3441 // Recover by removing the storage specifier.
3442 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified,
3448 // Ignore const/volatile/restrict qualifiers.
3449 if (DS.getTypeQualifiers()) {
3450 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
3451 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
3452 << Record->isUnion() << "const"
3453 << FixItHint::CreateRemoval(DS.getConstSpecLoc());
3454 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
3455 Diag(DS.getVolatileSpecLoc(),
3456 diag::ext_anonymous_struct_union_qualified)
3457 << Record->isUnion() << "volatile"
3458 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
3459 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
3460 Diag(DS.getRestrictSpecLoc(),
3461 diag::ext_anonymous_struct_union_qualified)
3462 << Record->isUnion() << "restrict"
3463 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
3464 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
3465 Diag(DS.getAtomicSpecLoc(),
3466 diag::ext_anonymous_struct_union_qualified)
3467 << Record->isUnion() << "_Atomic"
3468 << FixItHint::CreateRemoval(DS.getAtomicSpecLoc());
3470 DS.ClearTypeQualifiers();
3473 // C++ [class.union]p2:
3474 // The member-specification of an anonymous union shall only
3475 // define non-static data members. [Note: nested types and
3476 // functions cannot be declared within an anonymous union. ]
3477 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
3478 MemEnd = Record->decls_end();
3479 Mem != MemEnd; ++Mem) {
3480 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
3481 // C++ [class.union]p3:
3482 // An anonymous union shall not have private or protected
3483 // members (clause 11).
3484 assert(FD->getAccess() != AS_none);
3485 if (FD->getAccess() != AS_public) {
3486 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
3487 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
3491 // C++ [class.union]p1
3492 // An object of a class with a non-trivial constructor, a non-trivial
3493 // copy constructor, a non-trivial destructor, or a non-trivial copy
3494 // assignment operator cannot be a member of a union, nor can an
3495 // array of such objects.
3496 if (CheckNontrivialField(FD))
3498 } else if ((*Mem)->isImplicit()) {
3499 // Any implicit members are fine.
3500 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
3501 // This is a type that showed up in an
3502 // elaborated-type-specifier inside the anonymous struct or
3503 // union, but which actually declares a type outside of the
3504 // anonymous struct or union. It's okay.
3505 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
3506 if (!MemRecord->isAnonymousStructOrUnion() &&
3507 MemRecord->getDeclName()) {
3508 // Visual C++ allows type definition in anonymous struct or union.
3509 if (getLangOpts().MicrosoftExt)
3510 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
3511 << (int)Record->isUnion();
3513 // This is a nested type declaration.
3514 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
3515 << (int)Record->isUnion();
3519 // This is an anonymous type definition within another anonymous type.
3520 // This is a popular extension, provided by Plan9, MSVC and GCC, but
3521 // not part of standard C++.
3522 Diag(MemRecord->getLocation(),
3523 diag::ext_anonymous_record_with_anonymous_type)
3524 << (int)Record->isUnion();
3526 } else if (isa<AccessSpecDecl>(*Mem)) {
3527 // Any access specifier is fine.
3529 // We have something that isn't a non-static data
3530 // member. Complain about it.
3531 unsigned DK = diag::err_anonymous_record_bad_member;
3532 if (isa<TypeDecl>(*Mem))
3533 DK = diag::err_anonymous_record_with_type;
3534 else if (isa<FunctionDecl>(*Mem))
3535 DK = diag::err_anonymous_record_with_function;
3536 else if (isa<VarDecl>(*Mem))
3537 DK = diag::err_anonymous_record_with_static;
3539 // Visual C++ allows type definition in anonymous struct or union.
3540 if (getLangOpts().MicrosoftExt &&
3541 DK == diag::err_anonymous_record_with_type)
3542 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type)
3543 << (int)Record->isUnion();
3545 Diag((*Mem)->getLocation(), DK)
3546 << (int)Record->isUnion();
3553 if (!Record->isUnion() && !Owner->isRecord()) {
3554 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
3555 << (int)getLangOpts().CPlusPlus;
3559 // Mock up a declarator.
3560 Declarator Dc(DS, Declarator::MemberContext);
3561 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
3562 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
3564 // Create a declaration for this anonymous struct/union.
3565 NamedDecl *Anon = 0;
3566 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
3567 Anon = FieldDecl::Create(Context, OwningClass,
3569 Record->getLocation(),
3570 /*IdentifierInfo=*/0,
3571 Context.getTypeDeclType(Record),
3573 /*BitWidth=*/0, /*Mutable=*/false,
3574 /*InitStyle=*/ICIS_NoInit);
3575 Anon->setAccess(AS);
3576 if (getLangOpts().CPlusPlus)
3577 FieldCollector->Add(cast<FieldDecl>(Anon));
3579 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
3580 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(DS);
3581 if (SCSpec == DeclSpec::SCS_mutable) {
3582 // mutable can only appear on non-static class members, so it's always
3584 Diag(Record->getLocation(), diag::err_mutable_nonmember);
3589 Anon = VarDecl::Create(Context, Owner,
3591 Record->getLocation(), /*IdentifierInfo=*/0,
3592 Context.getTypeDeclType(Record),
3595 // Default-initialize the implicit variable. This initialization will be
3596 // trivial in almost all cases, except if a union member has an in-class
3598 // union { int n = 0; };
3599 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
3601 Anon->setImplicit();
3603 // Add the anonymous struct/union object to the current
3604 // context. We'll be referencing this object when we refer to one of
3606 Owner->addDecl(Anon);
3608 // Inject the members of the anonymous struct/union into the owning
3609 // context and into the identifier resolver chain for name lookup
3611 SmallVector<NamedDecl*, 2> Chain;
3612 Chain.push_back(Anon);
3614 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS,
3618 // Mark this as an anonymous struct/union type. Note that we do not
3619 // do this until after we have already checked and injected the
3620 // members of this anonymous struct/union type, because otherwise
3621 // the members could be injected twice: once by DeclContext when it
3622 // builds its lookup table, and once by
3623 // InjectAnonymousStructOrUnionMembers.
3624 Record->setAnonymousStructOrUnion(true);
3627 Anon->setInvalidDecl();
3632 /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
3633 /// Microsoft C anonymous structure.
3634 /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
3637 /// struct A { int a; };
3638 /// struct B { struct A; int b; };
3645 Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
3646 RecordDecl *Record) {
3648 // If there is no Record, get the record via the typedef.
3650 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl();
3652 // Mock up a declarator.
3653 Declarator Dc(DS, Declarator::TypeNameContext);
3654 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
3655 assert(TInfo && "couldn't build declarator info for anonymous struct");
3657 // Create a declaration for this anonymous struct.
3658 NamedDecl* Anon = FieldDecl::Create(Context,
3659 cast<RecordDecl>(CurContext),
3662 /*IdentifierInfo=*/0,
3663 Context.getTypeDeclType(Record),
3665 /*BitWidth=*/0, /*Mutable=*/false,
3666 /*InitStyle=*/ICIS_NoInit);
3667 Anon->setImplicit();
3669 // Add the anonymous struct object to the current context.
3670 CurContext->addDecl(Anon);
3672 // Inject the members of the anonymous struct into the current
3673 // context and into the identifier resolver chain for name lookup
3675 SmallVector<NamedDecl*, 2> Chain;
3676 Chain.push_back(Anon);
3678 RecordDecl *RecordDef = Record->getDefinition();
3679 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext,
3682 Anon->setInvalidDecl();
3687 /// GetNameForDeclarator - Determine the full declaration name for the
3688 /// given Declarator.
3689 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
3690 return GetNameFromUnqualifiedId(D.getName());
3693 /// \brief Retrieves the declaration name from a parsed unqualified-id.
3695 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
3696 DeclarationNameInfo NameInfo;
3697 NameInfo.setLoc(Name.StartLocation);
3699 switch (Name.getKind()) {
3701 case UnqualifiedId::IK_ImplicitSelfParam:
3702 case UnqualifiedId::IK_Identifier:
3703 NameInfo.setName(Name.Identifier);
3704 NameInfo.setLoc(Name.StartLocation);
3707 case UnqualifiedId::IK_OperatorFunctionId:
3708 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
3709 Name.OperatorFunctionId.Operator));
3710 NameInfo.setLoc(Name.StartLocation);
3711 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
3712 = Name.OperatorFunctionId.SymbolLocations[0];
3713 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
3714 = Name.EndLocation.getRawEncoding();
3717 case UnqualifiedId::IK_LiteralOperatorId:
3718 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
3720 NameInfo.setLoc(Name.StartLocation);
3721 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
3724 case UnqualifiedId::IK_ConversionFunctionId: {
3725 TypeSourceInfo *TInfo;
3726 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
3728 return DeclarationNameInfo();
3729 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
3730 Context.getCanonicalType(Ty)));
3731 NameInfo.setLoc(Name.StartLocation);
3732 NameInfo.setNamedTypeInfo(TInfo);
3736 case UnqualifiedId::IK_ConstructorName: {
3737 TypeSourceInfo *TInfo;
3738 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
3740 return DeclarationNameInfo();
3741 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
3742 Context.getCanonicalType(Ty)));
3743 NameInfo.setLoc(Name.StartLocation);
3744 NameInfo.setNamedTypeInfo(TInfo);
3748 case UnqualifiedId::IK_ConstructorTemplateId: {
3749 // In well-formed code, we can only have a constructor
3750 // template-id that refers to the current context, so go there
3751 // to find the actual type being constructed.
3752 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
3753 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
3754 return DeclarationNameInfo();
3756 // Determine the type of the class being constructed.
3757 QualType CurClassType = Context.getTypeDeclType(CurClass);
3759 // FIXME: Check two things: that the template-id names the same type as
3760 // CurClassType, and that the template-id does not occur when the name
3763 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
3764 Context.getCanonicalType(CurClassType)));
3765 NameInfo.setLoc(Name.StartLocation);
3766 // FIXME: should we retrieve TypeSourceInfo?
3767 NameInfo.setNamedTypeInfo(0);
3771 case UnqualifiedId::IK_DestructorName: {
3772 TypeSourceInfo *TInfo;
3773 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
3775 return DeclarationNameInfo();
3776 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
3777 Context.getCanonicalType(Ty)));
3778 NameInfo.setLoc(Name.StartLocation);
3779 NameInfo.setNamedTypeInfo(TInfo);
3783 case UnqualifiedId::IK_TemplateId: {
3784 TemplateName TName = Name.TemplateId->Template.get();
3785 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
3786 return Context.getNameForTemplate(TName, TNameLoc);
3789 } // switch (Name.getKind())
3791 llvm_unreachable("Unknown name kind");
3794 static QualType getCoreType(QualType Ty) {
3796 if (Ty->isPointerType() || Ty->isReferenceType())
3797 Ty = Ty->getPointeeType();
3798 else if (Ty->isArrayType())
3799 Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
3801 return Ty.withoutLocalFastQualifiers();
3805 /// hasSimilarParameters - Determine whether the C++ functions Declaration
3806 /// and Definition have "nearly" matching parameters. This heuristic is
3807 /// used to improve diagnostics in the case where an out-of-line function
3808 /// definition doesn't match any declaration within the class or namespace.
3809 /// Also sets Params to the list of indices to the parameters that differ
3810 /// between the declaration and the definition. If hasSimilarParameters
3811 /// returns true and Params is empty, then all of the parameters match.
3812 static bool hasSimilarParameters(ASTContext &Context,
3813 FunctionDecl *Declaration,
3814 FunctionDecl *Definition,
3815 SmallVectorImpl<unsigned> &Params) {
3817 if (Declaration->param_size() != Definition->param_size())
3819 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
3820 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
3821 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
3823 // The parameter types are identical
3824 if (Context.hasSameType(DefParamTy, DeclParamTy))
3827 QualType DeclParamBaseTy = getCoreType(DeclParamTy);
3828 QualType DefParamBaseTy = getCoreType(DefParamTy);
3829 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
3830 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
3832 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
3833 (DeclTyName && DeclTyName == DefTyName))
3834 Params.push_back(Idx);
3835 else // The two parameters aren't even close
3842 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given
3843 /// declarator needs to be rebuilt in the current instantiation.
3844 /// Any bits of declarator which appear before the name are valid for
3845 /// consideration here. That's specifically the type in the decl spec
3846 /// and the base type in any member-pointer chunks.
3847 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
3848 DeclarationName Name) {
3849 // The types we specifically need to rebuild are:
3850 // - typenames, typeofs, and decltypes
3851 // - types which will become injected class names
3852 // Of course, we also need to rebuild any type referencing such a
3853 // type. It's safest to just say "dependent", but we call out a
3856 DeclSpec &DS = D.getMutableDeclSpec();
3857 switch (DS.getTypeSpecType()) {
3858 case DeclSpec::TST_typename:
3859 case DeclSpec::TST_typeofType:
3860 case DeclSpec::TST_underlyingType:
3861 case DeclSpec::TST_atomic: {
3862 // Grab the type from the parser.
3863 TypeSourceInfo *TSI = 0;
3864 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
3865 if (T.isNull() || !T->isDependentType()) break;
3867 // Make sure there's a type source info. This isn't really much
3868 // of a waste; most dependent types should have type source info
3869 // attached already.
3871 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
3873 // Rebuild the type in the current instantiation.
3874 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
3875 if (!TSI) return true;
3877 // Store the new type back in the decl spec.
3878 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
3879 DS.UpdateTypeRep(LocType);
3883 case DeclSpec::TST_decltype:
3884 case DeclSpec::TST_typeofExpr: {
3885 Expr *E = DS.getRepAsExpr();
3886 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
3887 if (Result.isInvalid()) return true;
3888 DS.UpdateExprRep(Result.get());
3893 // Nothing to do for these decl specs.
3897 // It doesn't matter what order we do this in.
3898 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3899 DeclaratorChunk &Chunk = D.getTypeObject(I);
3901 // The only type information in the declarator which can come
3902 // before the declaration name is the base type of a member
3904 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
3907 // Rebuild the scope specifier in-place.
3908 CXXScopeSpec &SS = Chunk.Mem.Scope();
3909 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
3916 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
3917 D.setFunctionDefinitionKind(FDK_Declaration);
3918 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg());
3920 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() &&
3921 Dcl && Dcl->getDeclContext()->isFileContext())
3922 Dcl->setTopLevelDeclInObjCContainer();
3927 /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
3928 /// If T is the name of a class, then each of the following shall have a
3929 /// name different from T:
3930 /// - every static data member of class T;
3931 /// - every member function of class T
3932 /// - every member of class T that is itself a type;
3933 /// \returns true if the declaration name violates these rules.
3934 bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
3935 DeclarationNameInfo NameInfo) {
3936 DeclarationName Name = NameInfo.getName();
3938 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC))
3939 if (Record->getIdentifier() && Record->getDeclName() == Name) {
3940 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
3947 /// \brief Diagnose a declaration whose declarator-id has the given
3948 /// nested-name-specifier.
3950 /// \param SS The nested-name-specifier of the declarator-id.
3952 /// \param DC The declaration context to which the nested-name-specifier
3955 /// \param Name The name of the entity being declared.
3957 /// \param Loc The location of the name of the entity being declared.
3959 /// \returns true if we cannot safely recover from this error, false otherwise.
3960 bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
3961 DeclarationName Name,
3962 SourceLocation Loc) {
3963 DeclContext *Cur = CurContext;
3964 while (isa<LinkageSpecDecl>(Cur))
3965 Cur = Cur->getParent();
3967 // C++ [dcl.meaning]p1:
3968 // A declarator-id shall not be qualified except for the definition
3969 // of a member function (9.3) or static data member (9.4) outside of
3970 // its class, the definition or explicit instantiation of a function
3971 // or variable member of a namespace outside of its namespace, or the
3972 // definition of an explicit specialization outside of its namespace,
3973 // or the declaration of a friend function that is a member of
3974 // another class or namespace (11.3). [...]
3976 // The user provided a superfluous scope specifier that refers back to the
3977 // class or namespaces in which the entity is already declared.
3982 if (Cur->Equals(DC)) {
3983 Diag(Loc, LangOpts.MicrosoftExt? diag::warn_member_extra_qualification
3984 : diag::err_member_extra_qualification)
3985 << Name << FixItHint::CreateRemoval(SS.getRange());
3990 // Check whether the qualifying scope encloses the scope of the original
3992 if (!Cur->Encloses(DC)) {
3993 if (Cur->isRecord())
3994 Diag(Loc, diag::err_member_qualification)
3995 << Name << SS.getRange();
3996 else if (isa<TranslationUnitDecl>(DC))
3997 Diag(Loc, diag::err_invalid_declarator_global_scope)
3998 << Name << SS.getRange();
3999 else if (isa<FunctionDecl>(Cur))
4000 Diag(Loc, diag::err_invalid_declarator_in_function)
4001 << Name << SS.getRange();
4003 Diag(Loc, diag::err_invalid_declarator_scope)
4004 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange();
4009 if (Cur->isRecord()) {
4010 // Cannot qualify members within a class.
4011 Diag(Loc, diag::err_member_qualification)
4012 << Name << SS.getRange();
4015 // C++ constructors and destructors with incorrect scopes can break
4016 // our AST invariants by having the wrong underlying types. If
4017 // that's the case, then drop this declaration entirely.
4018 if ((Name.getNameKind() == DeclarationName::CXXConstructorName ||
4019 Name.getNameKind() == DeclarationName::CXXDestructorName) &&
4020 !Context.hasSameType(Name.getCXXNameType(),
4021 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur))))
4027 // C++11 [dcl.meaning]p1:
4028 // [...] "The nested-name-specifier of the qualified declarator-id shall
4029 // not begin with a decltype-specifer"
4030 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data());
4031 while (SpecLoc.getPrefix())
4032 SpecLoc = SpecLoc.getPrefix();
4033 if (dyn_cast_or_null<DecltypeType>(
4034 SpecLoc.getNestedNameSpecifier()->getAsType()))
4035 Diag(Loc, diag::err_decltype_in_declarator)
4036 << SpecLoc.getTypeLoc().getSourceRange();
4041 NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D,
4042 MultiTemplateParamsArg TemplateParamLists) {
4043 // TODO: consider using NameInfo for diagnostic.
4044 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
4045 DeclarationName Name = NameInfo.getName();
4047 // All of these full declarators require an identifier. If it doesn't have
4048 // one, the ParsedFreeStandingDeclSpec action should be used.
4050 if (!D.isInvalidType()) // Reject this if we think it is valid.
4051 Diag(D.getDeclSpec().getLocStart(),
4052 diag::err_declarator_need_ident)
4053 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
4055 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
4058 // The scope passed in may not be a decl scope. Zip up the scope tree until
4059 // we find one that is.
4060 while ((S->getFlags() & Scope::DeclScope) == 0 ||
4061 (S->getFlags() & Scope::TemplateParamScope) != 0)
4064 DeclContext *DC = CurContext;
4065 if (D.getCXXScopeSpec().isInvalid())
4067 else if (D.getCXXScopeSpec().isSet()) {
4068 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
4069 UPPC_DeclarationQualifier))
4072 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
4073 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
4075 // If we could not compute the declaration context, it's because the
4076 // declaration context is dependent but does not refer to a class,
4077 // class template, or class template partial specialization. Complain
4078 // and return early, to avoid the coming semantic disaster.
4079 Diag(D.getIdentifierLoc(),
4080 diag::err_template_qualified_declarator_no_match)
4081 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
4082 << D.getCXXScopeSpec().getRange();
4085 bool IsDependentContext = DC->isDependentContext();
4087 if (!IsDependentContext &&
4088 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
4091 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
4092 Diag(D.getIdentifierLoc(),
4093 diag::err_member_def_undefined_record)
4094 << Name << DC << D.getCXXScopeSpec().getRange();
4096 } else if (!D.getDeclSpec().isFriendSpecified()) {
4097 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC,
4098 Name, D.getIdentifierLoc())) {
4106 // Check whether we need to rebuild the type of the given
4107 // declaration in the current instantiation.
4108 if (EnteringContext && IsDependentContext &&
4109 TemplateParamLists.size() != 0) {
4110 ContextRAII SavedContext(*this, DC);
4111 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
4116 if (DiagnoseClassNameShadow(DC, NameInfo))
4117 // If this is a typedef, we'll end up spewing multiple diagnostics.
4118 // Just return early; it's safer.
4119 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
4122 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
4123 QualType R = TInfo->getType();
4125 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
4126 UPPC_DeclarationType))
4129 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
4132 // See if this is a redefinition of a variable in the same scope.
4133 if (!D.getCXXScopeSpec().isSet()) {
4134 bool IsLinkageLookup = false;
4136 // If the declaration we're planning to build will be a function
4137 // or object with linkage, then look for another declaration with
4138 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
4139 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
4141 else if (R->isFunctionType()) {
4142 if (CurContext->isFunctionOrMethod() ||
4143 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
4144 IsLinkageLookup = true;
4145 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
4146 IsLinkageLookup = true;
4147 else if (CurContext->getRedeclContext()->isTranslationUnit() &&
4148 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
4149 IsLinkageLookup = true;
4151 if (IsLinkageLookup)
4152 Previous.clear(LookupRedeclarationWithLinkage);
4154 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
4155 } else { // Something like "int foo::x;"
4156 LookupQualifiedName(Previous, DC);
4158 // C++ [dcl.meaning]p1:
4159 // When the declarator-id is qualified, the declaration shall refer to a
4160 // previously declared member of the class or namespace to which the
4161 // qualifier refers (or, in the case of a namespace, of an element of the
4162 // inline namespace set of that namespace (7.3.1)) or to a specialization
4165 // Note that we already checked the context above, and that we do not have
4166 // enough information to make sure that Previous contains the declaration
4167 // we want to match. For example, given:
4174 // void X::f(int) { } // ill-formed
4176 // In this case, Previous will point to the overload set
4177 // containing the two f's declared in X, but neither of them
4180 // C++ [dcl.meaning]p1:
4181 // [...] the member shall not merely have been introduced by a
4182 // using-declaration in the scope of the class or namespace nominated by
4183 // the nested-name-specifier of the declarator-id.
4184 RemoveUsingDecls(Previous);
4187 if (Previous.isSingleResult() &&
4188 Previous.getFoundDecl()->isTemplateParameter()) {
4189 // Maybe we will complain about the shadowed template parameter.
4190 if (!D.isInvalidType())
4191 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
4192 Previous.getFoundDecl());
4194 // Just pretend that we didn't see the previous declaration.
4198 // In C++, the previous declaration we find might be a tag type
4199 // (class or enum). In this case, the new declaration will hide the
4200 // tag type. Note that this does does not apply if we're declaring a
4201 // typedef (C++ [dcl.typedef]p4).
4202 if (Previous.isSingleTagDecl() &&
4203 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
4206 // Check that there are no default arguments other than in the parameters
4207 // of a function declaration (C++ only).
4208 if (getLangOpts().CPlusPlus)
4209 CheckExtraCXXDefaultArguments(D);
4213 bool AddToScope = true;
4214 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
4215 if (TemplateParamLists.size()) {
4216 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
4220 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
4221 } else if (R->isFunctionType()) {
4222 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
4226 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
4227 TemplateParamLists);
4233 // If this has an identifier and is not an invalid redeclaration or
4234 // function template specialization, add it to the scope stack.
4235 if (New->getDeclName() && AddToScope &&
4236 !(D.isRedeclaration() && New->isInvalidDecl()))
4237 PushOnScopeChains(New, S);
4242 /// Helper method to turn variable array types into constant array
4243 /// types in certain situations which would otherwise be errors (for
4244 /// GCC compatibility).
4245 static QualType TryToFixInvalidVariablyModifiedType(QualType T,
4246 ASTContext &Context,
4247 bool &SizeIsNegative,
4248 llvm::APSInt &Oversized) {
4249 // This method tries to turn a variable array into a constant
4250 // array even when the size isn't an ICE. This is necessary
4251 // for compatibility with code that depends on gcc's buggy
4252 // constant expression folding, like struct {char x[(int)(char*)2];}
4253 SizeIsNegative = false;
4256 if (T->isDependentType())
4259 QualifierCollector Qs;
4260 const Type *Ty = Qs.strip(T);
4262 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
4263 QualType Pointee = PTy->getPointeeType();
4264 QualType FixedType =
4265 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
4267 if (FixedType.isNull()) return FixedType;
4268 FixedType = Context.getPointerType(FixedType);
4269 return Qs.apply(Context, FixedType);
4271 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
4272 QualType Inner = PTy->getInnerType();
4273 QualType FixedType =
4274 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
4276 if (FixedType.isNull()) return FixedType;
4277 FixedType = Context.getParenType(FixedType);
4278 return Qs.apply(Context, FixedType);
4281 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
4284 // FIXME: We should probably handle this case
4285 if (VLATy->getElementType()->isVariablyModifiedType())
4289 if (!VLATy->getSizeExpr() ||
4290 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context))
4293 // Check whether the array size is negative.
4294 if (Res.isSigned() && Res.isNegative()) {
4295 SizeIsNegative = true;
4299 // Check whether the array is too large to be addressed.
4300 unsigned ActiveSizeBits
4301 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
4303 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
4308 return Context.getConstantArrayType(VLATy->getElementType(),
4309 Res, ArrayType::Normal, 0);
4313 FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) {
4314 if (PointerTypeLoc SrcPTL = SrcTL.getAs<PointerTypeLoc>()) {
4315 PointerTypeLoc DstPTL = DstTL.castAs<PointerTypeLoc>();
4316 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getPointeeLoc(),
4317 DstPTL.getPointeeLoc());
4318 DstPTL.setStarLoc(SrcPTL.getStarLoc());
4321 if (ParenTypeLoc SrcPTL = SrcTL.getAs<ParenTypeLoc>()) {
4322 ParenTypeLoc DstPTL = DstTL.castAs<ParenTypeLoc>();
4323 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getInnerLoc(),
4324 DstPTL.getInnerLoc());
4325 DstPTL.setLParenLoc(SrcPTL.getLParenLoc());
4326 DstPTL.setRParenLoc(SrcPTL.getRParenLoc());
4329 ArrayTypeLoc SrcATL = SrcTL.castAs<ArrayTypeLoc>();
4330 ArrayTypeLoc DstATL = DstTL.castAs<ArrayTypeLoc>();
4331 TypeLoc SrcElemTL = SrcATL.getElementLoc();
4332 TypeLoc DstElemTL = DstATL.getElementLoc();
4333 DstElemTL.initializeFullCopy(SrcElemTL);
4334 DstATL.setLBracketLoc(SrcATL.getLBracketLoc());
4335 DstATL.setSizeExpr(SrcATL.getSizeExpr());
4336 DstATL.setRBracketLoc(SrcATL.getRBracketLoc());
4339 /// Helper method to turn variable array types into constant array
4340 /// types in certain situations which would otherwise be errors (for
4341 /// GCC compatibility).
4342 static TypeSourceInfo*
4343 TryToFixInvalidVariablyModifiedTypeSourceInfo(TypeSourceInfo *TInfo,
4344 ASTContext &Context,
4345 bool &SizeIsNegative,
4346 llvm::APSInt &Oversized) {
4348 = TryToFixInvalidVariablyModifiedType(TInfo->getType(), Context,
4349 SizeIsNegative, Oversized);
4350 if (FixedTy.isNull())
4352 TypeSourceInfo *FixedTInfo = Context.getTrivialTypeSourceInfo(FixedTy);
4353 FixInvalidVariablyModifiedTypeLoc(TInfo->getTypeLoc(),
4354 FixedTInfo->getTypeLoc());
4358 /// \brief Register the given locally-scoped extern "C" declaration so
4359 /// that it can be found later for redeclarations
4361 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
4362 const LookupResult &Previous,
4364 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
4365 "Decl is not a locally-scoped decl!");
4366 // Note that we have a locally-scoped external with this name.
4367 LocallyScopedExternCDecls[ND->getDeclName()] = ND;
4370 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
4371 Sema::findLocallyScopedExternCDecl(DeclarationName Name) {
4372 if (ExternalSource) {
4373 // Load locally-scoped external decls from the external source.
4374 SmallVector<NamedDecl *, 4> Decls;
4375 ExternalSource->ReadLocallyScopedExternCDecls(Decls);
4376 for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
4377 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
4378 = LocallyScopedExternCDecls.find(Decls[I]->getDeclName());
4379 if (Pos == LocallyScopedExternCDecls.end())
4380 LocallyScopedExternCDecls[Decls[I]->getDeclName()] = Decls[I];
4384 return LocallyScopedExternCDecls.find(Name);
4387 /// \brief Diagnose function specifiers on a declaration of an identifier that
4388 /// does not identify a function.
4389 void Sema::DiagnoseFunctionSpecifiers(const DeclSpec &DS) {
4390 // FIXME: We should probably indicate the identifier in question to avoid
4391 // confusion for constructs like "inline int a(), b;"
4392 if (DS.isInlineSpecified())
4393 Diag(DS.getInlineSpecLoc(),
4394 diag::err_inline_non_function);
4396 if (DS.isVirtualSpecified())
4397 Diag(DS.getVirtualSpecLoc(),
4398 diag::err_virtual_non_function);
4400 if (DS.isExplicitSpecified())
4401 Diag(DS.getExplicitSpecLoc(),
4402 diag::err_explicit_non_function);
4404 if (DS.isNoreturnSpecified())
4405 Diag(DS.getNoreturnSpecLoc(),
4406 diag::err_noreturn_non_function);
4410 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
4411 TypeSourceInfo *TInfo, LookupResult &Previous) {
4412 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
4413 if (D.getCXXScopeSpec().isSet()) {
4414 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
4415 << D.getCXXScopeSpec().getRange();
4417 // Pretend we didn't see the scope specifier.
4422 DiagnoseFunctionSpecifiers(D.getDeclSpec());
4424 if (D.getDeclSpec().isConstexprSpecified())
4425 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
4428 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
4429 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
4430 << D.getName().getSourceRange();
4434 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
4435 if (!NewTD) return 0;
4437 // Handle attributes prior to checking for duplicates in MergeVarDecl
4438 ProcessDeclAttributes(S, NewTD, D);
4440 CheckTypedefForVariablyModifiedType(S, NewTD);
4442 bool Redeclaration = D.isRedeclaration();
4443 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
4444 D.setRedeclaration(Redeclaration);
4449 Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
4450 // C99 6.7.7p2: If a typedef name specifies a variably modified type
4451 // then it shall have block scope.
4452 // Note that variably modified types must be fixed before merging the decl so
4453 // that redeclarations will match.
4454 TypeSourceInfo *TInfo = NewTD->getTypeSourceInfo();
4455 QualType T = TInfo->getType();
4456 if (T->isVariablyModifiedType()) {
4457 getCurFunction()->setHasBranchProtectedScope();
4459 if (S->getFnParent() == 0) {
4460 bool SizeIsNegative;
4461 llvm::APSInt Oversized;
4462 TypeSourceInfo *FixedTInfo =
4463 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
4467 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
4468 NewTD->setTypeSourceInfo(FixedTInfo);
4471 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
4472 else if (T->isVariableArrayType())
4473 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
4474 else if (Oversized.getBoolValue())
4475 Diag(NewTD->getLocation(), diag::err_array_too_large)
4476 << Oversized.toString(10);
4478 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
4479 NewTD->setInvalidDecl();
4486 /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
4487 /// declares a typedef-name, either using the 'typedef' type specifier or via
4488 /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
4490 Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
4491 LookupResult &Previous, bool &Redeclaration) {
4492 // Merge the decl with the existing one if appropriate. If the decl is
4493 // in an outer scope, it isn't the same thing.
4494 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false,
4495 /*ExplicitInstantiationOrSpecialization=*/false);
4496 filterNonConflictingPreviousDecls(Context, NewTD, Previous);
4497 if (!Previous.empty()) {
4498 Redeclaration = true;
4499 MergeTypedefNameDecl(NewTD, Previous);
4502 // If this is the C FILE type, notify the AST context.
4503 if (IdentifierInfo *II = NewTD->getIdentifier())
4504 if (!NewTD->isInvalidDecl() &&
4505 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
4506 if (II->isStr("FILE"))
4507 Context.setFILEDecl(NewTD);
4508 else if (II->isStr("jmp_buf"))
4509 Context.setjmp_bufDecl(NewTD);
4510 else if (II->isStr("sigjmp_buf"))
4511 Context.setsigjmp_bufDecl(NewTD);
4512 else if (II->isStr("ucontext_t"))
4513 Context.setucontext_tDecl(NewTD);
4519 /// \brief Determines whether the given declaration is an out-of-scope
4520 /// previous declaration.
4522 /// This routine should be invoked when name lookup has found a
4523 /// previous declaration (PrevDecl) that is not in the scope where a
4524 /// new declaration by the same name is being introduced. If the new
4525 /// declaration occurs in a local scope, previous declarations with
4526 /// linkage may still be considered previous declarations (C99
4527 /// 6.2.2p4-5, C++ [basic.link]p6).
4529 /// \param PrevDecl the previous declaration found by name
4532 /// \param DC the context in which the new declaration is being
4535 /// \returns true if PrevDecl is an out-of-scope previous declaration
4536 /// for a new delcaration with the same name.
4538 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
4539 ASTContext &Context) {
4543 if (!PrevDecl->hasLinkage())
4546 if (Context.getLangOpts().CPlusPlus) {
4547 // C++ [basic.link]p6:
4548 // If there is a visible declaration of an entity with linkage
4549 // having the same name and type, ignoring entities declared
4550 // outside the innermost enclosing namespace scope, the block
4551 // scope declaration declares that same entity and receives the
4552 // linkage of the previous declaration.
4553 DeclContext *OuterContext = DC->getRedeclContext();
4554 if (!OuterContext->isFunctionOrMethod())
4555 // This rule only applies to block-scope declarations.
4558 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
4559 if (PrevOuterContext->isRecord())
4560 // We found a member function: ignore it.
4563 // Find the innermost enclosing namespace for the new and
4564 // previous declarations.
4565 OuterContext = OuterContext->getEnclosingNamespaceContext();
4566 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
4568 // The previous declaration is in a different namespace, so it
4569 // isn't the same function.
4570 if (!OuterContext->Equals(PrevOuterContext))
4577 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
4578 CXXScopeSpec &SS = D.getCXXScopeSpec();
4579 if (!SS.isSet()) return;
4580 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
4583 bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
4584 QualType type = decl->getType();
4585 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
4586 if (lifetime == Qualifiers::OCL_Autoreleasing) {
4587 // Various kinds of declaration aren't allowed to be __autoreleasing.
4588 unsigned kind = -1U;
4589 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
4590 if (var->hasAttr<BlocksAttr>())
4591 kind = 0; // __block
4592 else if (!var->hasLocalStorage())
4594 } else if (isa<ObjCIvarDecl>(decl)) {
4596 } else if (isa<FieldDecl>(decl)) {
4601 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
4604 } else if (lifetime == Qualifiers::OCL_None) {
4605 // Try to infer lifetime.
4606 if (!type->isObjCLifetimeType())
4609 lifetime = type->getObjCARCImplicitLifetime();
4610 type = Context.getLifetimeQualifiedType(type, lifetime);
4611 decl->setType(type);
4614 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
4615 // Thread-local variables cannot have lifetime.
4616 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
4617 var->getTLSKind()) {
4618 Diag(var->getLocation(), diag::err_arc_thread_ownership)
4627 static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) {
4628 // 'weak' only applies to declarations with external linkage.
4629 if (WeakAttr *Attr = ND.getAttr<WeakAttr>()) {
4630 if (ND.getLinkage() != ExternalLinkage) {
4631 S.Diag(Attr->getLocation(), diag::err_attribute_weak_static);
4632 ND.dropAttr<WeakAttr>();
4635 if (WeakRefAttr *Attr = ND.getAttr<WeakRefAttr>()) {
4636 if (ND.hasExternalLinkage()) {
4637 S.Diag(Attr->getLocation(), diag::err_attribute_weakref_not_static);
4638 ND.dropAttr<WeakRefAttr>();
4643 /// Given that we are within the definition of the given function,
4644 /// will that definition behave like C99's 'inline', where the
4645 /// definition is discarded except for optimization purposes?
4646 static bool isFunctionDefinitionDiscarded(Sema &S, FunctionDecl *FD) {
4647 // Try to avoid calling GetGVALinkageForFunction.
4649 // All cases of this require the 'inline' keyword.
4650 if (!FD->isInlined()) return false;
4652 // This is only possible in C++ with the gnu_inline attribute.
4653 if (S.getLangOpts().CPlusPlus && !FD->hasAttr<GNUInlineAttr>())
4656 // Okay, go ahead and call the relatively-more-expensive function.
4659 // AST quite reasonably asserts that it's working on a function
4660 // definition. We don't really have a way to tell it that we're
4661 // currently defining the function, so just lie to it in +Asserts
4662 // builds. This is an awful hack.
4666 bool isC99Inline = (S.Context.GetGVALinkageForFunction(FD) == GVA_C99Inline);
4675 static bool shouldConsiderLinkage(const VarDecl *VD) {
4676 const DeclContext *DC = VD->getDeclContext()->getRedeclContext();
4677 if (DC->isFunctionOrMethod())
4678 return VD->hasExternalStorage();
4679 if (DC->isFileContext())
4683 llvm_unreachable("Unexpected context");
4686 static bool shouldConsiderLinkage(const FunctionDecl *FD) {
4687 const DeclContext *DC = FD->getDeclContext()->getRedeclContext();
4688 if (DC->isFileContext() || DC->isFunctionOrMethod())
4692 llvm_unreachable("Unexpected context");
4696 Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
4697 TypeSourceInfo *TInfo, LookupResult &Previous,
4698 MultiTemplateParamsArg TemplateParamLists) {
4699 QualType R = TInfo->getType();
4700 DeclarationName Name = GetNameForDeclarator(D).getName();
4702 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
4703 VarDecl::StorageClass SC =
4704 StorageClassSpecToVarDeclStorageClass(D.getDeclSpec());
4706 if (getLangOpts().OpenCL && !getOpenCLOptions().cl_khr_fp16) {
4707 // OpenCL v1.2 s6.1.1.1: reject declaring variables of the half and
4708 // half array type (unless the cl_khr_fp16 extension is enabled).
4709 if (Context.getBaseElementType(R)->isHalfType()) {
4710 Diag(D.getIdentifierLoc(), diag::err_opencl_half_declaration) << R;
4715 if (SCSpec == DeclSpec::SCS_mutable) {
4716 // mutable can only appear on non-static class members, so it's always
4718 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
4723 // C++11 [dcl.stc]p4:
4724 // When thread_local is applied to a variable of block scope the
4725 // storage-class-specifier static is implied if it does not appear
4727 // Core issue: 'static' is not implied if the variable is declared 'extern'.
4728 if (SCSpec == DeclSpec::SCS_unspecified &&
4729 D.getDeclSpec().getThreadStorageClassSpec() ==
4730 DeclSpec::TSCS_thread_local && DC->isFunctionOrMethod())
4733 IdentifierInfo *II = Name.getAsIdentifierInfo();
4735 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
4740 DiagnoseFunctionSpecifiers(D.getDeclSpec());
4742 if (!DC->isRecord() && S->getFnParent() == 0) {
4743 // C99 6.9p2: The storage-class specifiers auto and register shall not
4744 // appear in the declaration specifiers in an external declaration.
4745 if (SC == SC_Auto || SC == SC_Register) {
4747 // If this is a register variable with an asm label specified, then this
4748 // is a GNU extension.
4749 if (SC == SC_Register && D.getAsmLabel())
4750 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
4752 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
4757 if (getLangOpts().OpenCL) {
4758 // Set up the special work-group-local storage class for variables in the
4759 // OpenCL __local address space.
4760 if (R.getAddressSpace() == LangAS::opencl_local) {
4761 SC = SC_OpenCLWorkGroupLocal;
4764 // OpenCL v1.2 s6.9.b p4:
4765 // The sampler type cannot be used with the __local and __global address
4766 // space qualifiers.
4767 if (R->isSamplerT() && (R.getAddressSpace() == LangAS::opencl_local ||
4768 R.getAddressSpace() == LangAS::opencl_global)) {
4769 Diag(D.getIdentifierLoc(), diag::err_wrong_sampler_addressspace);
4772 // OpenCL 1.2 spec, p6.9 r:
4773 // The event type cannot be used to declare a program scope variable.
4774 // The event type cannot be used with the __local, __constant and __global
4775 // address space qualifiers.
4776 if (R->isEventT()) {
4777 if (S->getParent() == 0) {
4778 Diag(D.getLocStart(), diag::err_event_t_global_var);
4782 if (R.getAddressSpace()) {
4783 Diag(D.getLocStart(), diag::err_event_t_addr_space_qual);
4789 bool isExplicitSpecialization = false;
4791 if (!getLangOpts().CPlusPlus) {
4792 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
4793 D.getIdentifierLoc(), II,
4796 if (D.isInvalidType())
4797 NewVD->setInvalidDecl();
4799 if (DC->isRecord() && !CurContext->isRecord()) {
4800 // This is an out-of-line definition of a static data member.
4801 if (SC == SC_Static) {
4802 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4803 diag::err_static_out_of_line)
4804 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
4807 if (SC == SC_Static && CurContext->isRecord()) {
4808 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
4809 if (RD->isLocalClass())
4810 Diag(D.getIdentifierLoc(),
4811 diag::err_static_data_member_not_allowed_in_local_class)
4812 << Name << RD->getDeclName();
4814 // C++98 [class.union]p1: If a union contains a static data member,
4815 // the program is ill-formed. C++11 drops this restriction.
4817 Diag(D.getIdentifierLoc(),
4818 getLangOpts().CPlusPlus11
4819 ? diag::warn_cxx98_compat_static_data_member_in_union
4820 : diag::ext_static_data_member_in_union) << Name;
4821 // We conservatively disallow static data members in anonymous structs.
4822 else if (!RD->getDeclName())
4823 Diag(D.getIdentifierLoc(),
4824 diag::err_static_data_member_not_allowed_in_anon_struct)
4825 << Name << RD->isUnion();
4829 // Match up the template parameter lists with the scope specifier, then
4830 // determine whether we have a template or a template specialization.
4831 isExplicitSpecialization = false;
4832 bool Invalid = false;
4833 if (TemplateParameterList *TemplateParams
4834 = MatchTemplateParametersToScopeSpecifier(
4835 D.getDeclSpec().getLocStart(),
4836 D.getIdentifierLoc(),
4837 D.getCXXScopeSpec(),
4838 TemplateParamLists.data(),
4839 TemplateParamLists.size(),
4840 /*never a friend*/ false,
4841 isExplicitSpecialization,
4843 if (TemplateParams->size() > 0) {
4844 // There is no such thing as a variable template.
4845 Diag(D.getIdentifierLoc(), diag::err_template_variable)
4847 << SourceRange(TemplateParams->getTemplateLoc(),
4848 TemplateParams->getRAngleLoc());
4851 // There is an extraneous 'template<>' for this variable. Complain
4852 // about it, but allow the declaration of the variable.
4853 Diag(TemplateParams->getTemplateLoc(),
4854 diag::err_template_variable_noparams)
4856 << SourceRange(TemplateParams->getTemplateLoc(),
4857 TemplateParams->getRAngleLoc());
4861 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
4862 D.getIdentifierLoc(), II,
4865 // If this decl has an auto type in need of deduction, make a note of the
4866 // Decl so we can diagnose uses of it in its own initializer.
4867 if (D.getDeclSpec().containsPlaceholderType() && R->getContainedAutoType())
4868 ParsingInitForAutoVars.insert(NewVD);
4870 if (D.isInvalidType() || Invalid)
4871 NewVD->setInvalidDecl();
4873 SetNestedNameSpecifier(NewVD, D);
4875 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) {
4876 NewVD->setTemplateParameterListsInfo(Context,
4877 TemplateParamLists.size(),
4878 TemplateParamLists.data());
4881 if (D.getDeclSpec().isConstexprSpecified())
4882 NewVD->setConstexpr(true);
4885 // Set the lexical context. If the declarator has a C++ scope specifier, the
4886 // lexical context will be different from the semantic context.
4887 NewVD->setLexicalDeclContext(CurContext);
4889 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) {
4890 if (NewVD->hasLocalStorage())
4891 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
4892 diag::err_thread_non_global)
4893 << DeclSpec::getSpecifierName(TSCS);
4894 else if (!Context.getTargetInfo().isTLSSupported())
4895 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
4896 diag::err_thread_unsupported);
4898 NewVD->setTSCSpec(TSCS);
4902 // An inline definition of a function with external linkage shall
4903 // not contain a definition of a modifiable object with static or
4904 // thread storage duration...
4905 // We only apply this when the function is required to be defined
4906 // elsewhere, i.e. when the function is not 'extern inline'. Note
4907 // that a local variable with thread storage duration still has to
4908 // be marked 'static'. Also note that it's possible to get these
4909 // semantics in C++ using __attribute__((gnu_inline)).
4910 if (SC == SC_Static && S->getFnParent() != 0 &&
4911 !NewVD->getType().isConstQualified()) {
4912 FunctionDecl *CurFD = getCurFunctionDecl();
4913 if (CurFD && isFunctionDefinitionDiscarded(*this, CurFD)) {
4914 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4915 diag::warn_static_local_in_extern_inline);
4916 MaybeSuggestAddingStaticToDecl(CurFD);
4920 if (D.getDeclSpec().isModulePrivateSpecified()) {
4921 if (isExplicitSpecialization)
4922 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
4924 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
4925 else if (NewVD->hasLocalStorage())
4926 Diag(NewVD->getLocation(), diag::err_module_private_local)
4927 << 0 << NewVD->getDeclName()
4928 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
4929 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
4931 NewVD->setModulePrivate();
4934 // Handle attributes prior to checking for duplicates in MergeVarDecl
4935 ProcessDeclAttributes(S, NewVD, D);
4937 if (NewVD->hasAttrs())
4938 CheckAlignasUnderalignment(NewVD);
4940 if (getLangOpts().CUDA) {
4941 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static
4942 // storage [duration]."
4943 if (SC == SC_None && S->getFnParent() != 0 &&
4944 (NewVD->hasAttr<CUDASharedAttr>() ||
4945 NewVD->hasAttr<CUDAConstantAttr>())) {
4946 NewVD->setStorageClass(SC_Static);
4950 // In auto-retain/release, infer strong retension for variables of
4952 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
4953 NewVD->setInvalidDecl();
4955 // Handle GNU asm-label extension (encoded as an attribute).
4956 if (Expr *E = (Expr*)D.getAsmLabel()) {
4957 // The parser guarantees this is a string.
4958 StringLiteral *SE = cast<StringLiteral>(E);
4959 StringRef Label = SE->getString();
4960 if (S->getFnParent() != 0) {
4964 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
4967 if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
4968 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
4972 case SC_PrivateExtern:
4973 case SC_OpenCLWorkGroupLocal:
4978 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
4980 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
4981 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
4982 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
4983 if (I != ExtnameUndeclaredIdentifiers.end()) {
4984 NewVD->addAttr(I->second);
4985 ExtnameUndeclaredIdentifiers.erase(I);
4989 // Diagnose shadowed variables before filtering for scope.
4990 if (!D.getCXXScopeSpec().isSet())
4991 CheckShadow(S, NewVD, Previous);
4993 // Don't consider existing declarations that are in a different
4994 // scope and are out-of-semantic-context declarations (if the new
4995 // declaration has linkage).
4996 FilterLookupForScope(Previous, DC, S, shouldConsiderLinkage(NewVD),
4997 isExplicitSpecialization);
4999 if (!getLangOpts().CPlusPlus) {
5000 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
5002 // Merge the decl with the existing one if appropriate.
5003 if (!Previous.empty()) {
5004 if (Previous.isSingleResult() &&
5005 isa<FieldDecl>(Previous.getFoundDecl()) &&
5006 D.getCXXScopeSpec().isSet()) {
5007 // The user tried to define a non-static data member
5008 // out-of-line (C++ [dcl.meaning]p1).
5009 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
5010 << D.getCXXScopeSpec().getRange();
5012 NewVD->setInvalidDecl();
5014 } else if (D.getCXXScopeSpec().isSet()) {
5015 // No previous declaration in the qualifying scope.
5016 Diag(D.getIdentifierLoc(), diag::err_no_member)
5017 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
5018 << D.getCXXScopeSpec().getRange();
5019 NewVD->setInvalidDecl();
5022 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
5024 // This is an explicit specialization of a static data member. Check it.
5025 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
5026 CheckMemberSpecialization(NewVD, Previous))
5027 NewVD->setInvalidDecl();
5030 ProcessPragmaWeak(S, NewVD);
5031 checkAttributesAfterMerging(*this, *NewVD);
5033 // If this is a locally-scoped extern C variable, update the map of
5035 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
5036 !NewVD->isInvalidDecl())
5037 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
5042 /// \brief Diagnose variable or built-in function shadowing. Implements
5045 /// This method is called whenever a VarDecl is added to a "useful"
5048 /// \param S the scope in which the shadowing name is being declared
5049 /// \param R the lookup of the name
5051 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
5052 // Return if warning is ignored.
5053 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) ==
5054 DiagnosticsEngine::Ignored)
5057 // Don't diagnose declarations at file scope.
5058 if (D->hasGlobalStorage())
5061 DeclContext *NewDC = D->getDeclContext();
5063 // Only diagnose if we're shadowing an unambiguous field or variable.
5064 if (R.getResultKind() != LookupResult::Found)
5067 NamedDecl* ShadowedDecl = R.getFoundDecl();
5068 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
5071 // Fields are not shadowed by variables in C++ static methods.
5072 if (isa<FieldDecl>(ShadowedDecl))
5073 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
5077 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
5078 if (shadowedVar->isExternC()) {
5079 // For shadowing external vars, make sure that we point to the global
5080 // declaration, not a locally scoped extern declaration.
5081 for (VarDecl::redecl_iterator
5082 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end();
5084 if (I->isFileVarDecl()) {
5090 DeclContext *OldDC = ShadowedDecl->getDeclContext();
5092 // Only warn about certain kinds of shadowing for class members.
5093 if (NewDC && NewDC->isRecord()) {
5094 // In particular, don't warn about shadowing non-class members.
5095 if (!OldDC->isRecord())
5098 // TODO: should we warn about static data members shadowing
5099 // static data members from base classes?
5101 // TODO: don't diagnose for inaccessible shadowed members.
5102 // This is hard to do perfectly because we might friend the
5103 // shadowing context, but that's just a false negative.
5106 // Determine what kind of declaration we're shadowing.
5108 if (isa<RecordDecl>(OldDC)) {
5109 if (isa<FieldDecl>(ShadowedDecl))
5112 Kind = 2; // static data member
5113 } else if (OldDC->isFileContext())
5118 DeclarationName Name = R.getLookupName();
5120 // Emit warning and note.
5121 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
5122 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
5125 /// \brief Check -Wshadow without the advantage of a previous lookup.
5126 void Sema::CheckShadow(Scope *S, VarDecl *D) {
5127 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) ==
5128 DiagnosticsEngine::Ignored)
5131 LookupResult R(*this, D->getDeclName(), D->getLocation(),
5132 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
5134 CheckShadow(S, D, R);
5137 template<typename T>
5138 static bool mayConflictWithNonVisibleExternC(const T *ND) {
5139 const DeclContext *DC = ND->getDeclContext();
5140 if (DC->getRedeclContext()->isTranslationUnit())
5143 // We know that is the first decl we see, other than function local
5144 // extern C ones. If this is C++ and the decl is not in a extern C context
5145 // it cannot have C language linkage. Avoid calling isExternC in that case.
5146 // We need to this because of code like
5148 // namespace { struct bar {}; }
5149 // auto foo = bar();
5151 // This code runs before the init of foo is set, and therefore before
5152 // the type of foo is known. Not knowing the type we cannot know its linkage
5153 // unless it is in an extern C block.
5154 if (!ND->isInExternCContext()) {
5155 const ASTContext &Context = ND->getASTContext();
5156 if (Context.getLangOpts().CPlusPlus)
5160 return ND->isExternC();
5163 void Sema::CheckVariableDeclarationType(VarDecl *NewVD) {
5164 // If the decl is already known invalid, don't check it.
5165 if (NewVD->isInvalidDecl())
5168 TypeSourceInfo *TInfo = NewVD->getTypeSourceInfo();
5169 QualType T = TInfo->getType();
5171 // Defer checking an 'auto' type until its initializer is attached.
5172 if (T->isUndeducedType())
5175 if (T->isObjCObjectType()) {
5176 Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
5177 << FixItHint::CreateInsertion(NewVD->getLocation(), "*");
5178 T = Context.getObjCObjectPointerType(T);
5182 // Emit an error if an address space was applied to decl with local storage.
5183 // This includes arrays of objects with address space qualifiers, but not
5184 // automatic variables that point to other address spaces.
5185 // ISO/IEC TR 18037 S5.1.2
5186 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
5187 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
5188 NewVD->setInvalidDecl();
5192 // OpenCL v1.2 s6.5 - All program scope variables must be declared in the
5193 // __constant address space.
5194 if (getLangOpts().OpenCL && NewVD->isFileVarDecl()
5195 && T.getAddressSpace() != LangAS::opencl_constant
5196 && !T->isSamplerT()){
5197 Diag(NewVD->getLocation(), diag::err_opencl_global_invalid_addr_space);
5198 NewVD->setInvalidDecl();
5202 // OpenCL v1.2 s6.8 -- The static qualifier is valid only in program
5204 if ((getLangOpts().OpenCLVersion >= 120)
5205 && NewVD->isStaticLocal()) {
5206 Diag(NewVD->getLocation(), diag::err_static_function_scope);
5207 NewVD->setInvalidDecl();
5211 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
5212 && !NewVD->hasAttr<BlocksAttr>()) {
5213 if (getLangOpts().getGC() != LangOptions::NonGC)
5214 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
5216 assert(!getLangOpts().ObjCAutoRefCount);
5217 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
5221 bool isVM = T->isVariablyModifiedType();
5222 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
5223 NewVD->hasAttr<BlocksAttr>())
5224 getCurFunction()->setHasBranchProtectedScope();
5226 if ((isVM && NewVD->hasLinkage()) ||
5227 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
5228 bool SizeIsNegative;
5229 llvm::APSInt Oversized;
5230 TypeSourceInfo *FixedTInfo =
5231 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
5232 SizeIsNegative, Oversized);
5233 if (FixedTInfo == 0 && T->isVariableArrayType()) {
5234 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
5235 // FIXME: This won't give the correct result for
5237 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
5239 if (NewVD->isFileVarDecl())
5240 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
5242 else if (NewVD->getStorageClass() == SC_Static)
5243 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
5246 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
5248 NewVD->setInvalidDecl();
5252 if (FixedTInfo == 0) {
5253 if (NewVD->isFileVarDecl())
5254 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
5256 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
5257 NewVD->setInvalidDecl();
5261 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
5262 NewVD->setType(FixedTInfo->getType());
5263 NewVD->setTypeSourceInfo(FixedTInfo);
5266 if (T->isVoidType() && NewVD->isThisDeclarationADefinition()) {
5267 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
5269 NewVD->setInvalidDecl();
5273 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
5274 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
5275 NewVD->setInvalidDecl();
5279 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
5280 Diag(NewVD->getLocation(), diag::err_block_on_vm);
5281 NewVD->setInvalidDecl();
5285 if (NewVD->isConstexpr() && !T->isDependentType() &&
5286 RequireLiteralType(NewVD->getLocation(), T,
5287 diag::err_constexpr_var_non_literal)) {
5288 // Can't perform this check until the type is deduced.
5289 NewVD->setInvalidDecl();
5294 /// \brief Perform semantic checking on a newly-created variable
5297 /// This routine performs all of the type-checking required for a
5298 /// variable declaration once it has been built. It is used both to
5299 /// check variables after they have been parsed and their declarators
5300 /// have been translated into a declaration, and to check variables
5301 /// that have been instantiated from a template.
5303 /// Sets NewVD->isInvalidDecl() if an error was encountered.
5305 /// Returns true if the variable declaration is a redeclaration.
5306 bool Sema::CheckVariableDeclaration(VarDecl *NewVD,
5307 LookupResult &Previous) {
5308 CheckVariableDeclarationType(NewVD);
5310 // If the decl is already known invalid, don't check it.
5311 if (NewVD->isInvalidDecl())
5314 // If we did not find anything by this name, look for a non-visible
5315 // extern "C" declaration with the same name.
5317 // Clang has a lot of problems with extern local declarations.
5318 // The actual standards text here is:
5320 // C++11 [basic.link]p6:
5321 // The name of a function declared in block scope and the name
5322 // of a variable declared by a block scope extern declaration
5323 // have linkage. If there is a visible declaration of an entity
5324 // with linkage having the same name and type, ignoring entities
5325 // declared outside the innermost enclosing namespace scope, the
5326 // block scope declaration declares that same entity and
5327 // receives the linkage of the previous declaration.
5330 // For an identifier with internal or external linkage declared
5331 // in a scope in which a prior declaration of that identifier is
5332 // visible, if the prior declaration specifies internal or
5333 // external linkage, the type of the identifier at the later
5334 // declaration becomes the composite type.
5336 // The most important point here is that we're not allowed to
5337 // update our understanding of the type according to declarations
5339 bool PreviousWasHidden = false;
5340 if (Previous.empty() && mayConflictWithNonVisibleExternC(NewVD)) {
5341 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
5342 = findLocallyScopedExternCDecl(NewVD->getDeclName());
5343 if (Pos != LocallyScopedExternCDecls.end()) {
5344 Previous.addDecl(Pos->second);
5345 PreviousWasHidden = true;
5349 // Filter out any non-conflicting previous declarations.
5350 filterNonConflictingPreviousDecls(Context, NewVD, Previous);
5352 if (!Previous.empty()) {
5353 MergeVarDecl(NewVD, Previous, PreviousWasHidden);
5359 /// \brief Data used with FindOverriddenMethod
5360 struct FindOverriddenMethodData {
5362 CXXMethodDecl *Method;
5365 /// \brief Member lookup function that determines whether a given C++
5366 /// method overrides a method in a base class, to be used with
5367 /// CXXRecordDecl::lookupInBases().
5368 static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
5371 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
5373 FindOverriddenMethodData *Data
5374 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
5376 DeclarationName Name = Data->Method->getDeclName();
5378 // FIXME: Do we care about other names here too?
5379 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
5380 // We really want to find the base class destructor here.
5381 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
5382 CanQualType CT = Data->S->Context.getCanonicalType(T);
5384 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
5387 for (Path.Decls = BaseRecord->lookup(Name);
5388 !Path.Decls.empty();
5389 Path.Decls = Path.Decls.slice(1)) {
5390 NamedDecl *D = Path.Decls.front();
5391 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
5392 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
5401 enum OverrideErrorKind { OEK_All, OEK_NonDeleted, OEK_Deleted };
5403 /// \brief Report an error regarding overriding, along with any relevant
5404 /// overriden methods.
5406 /// \param DiagID the primary error to report.
5407 /// \param MD the overriding method.
5408 /// \param OEK which overrides to include as notes.
5409 static void ReportOverrides(Sema& S, unsigned DiagID, const CXXMethodDecl *MD,
5410 OverrideErrorKind OEK = OEK_All) {
5411 S.Diag(MD->getLocation(), DiagID) << MD->getDeclName();
5412 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
5413 E = MD->end_overridden_methods();
5415 // This check (& the OEK parameter) could be replaced by a predicate, but
5416 // without lambdas that would be overkill. This is still nicer than writing
5417 // out the diag loop 3 times.
5418 if ((OEK == OEK_All) ||
5419 (OEK == OEK_NonDeleted && !(*I)->isDeleted()) ||
5420 (OEK == OEK_Deleted && (*I)->isDeleted()))
5421 S.Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
5425 /// AddOverriddenMethods - See if a method overrides any in the base classes,
5426 /// and if so, check that it's a valid override and remember it.
5427 bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
5428 // Look for virtual methods in base classes that this method might override.
5430 FindOverriddenMethodData Data;
5433 bool hasDeletedOverridenMethods = false;
5434 bool hasNonDeletedOverridenMethods = false;
5435 bool AddedAny = false;
5436 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
5437 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
5438 E = Paths.found_decls_end(); I != E; ++I) {
5439 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
5440 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
5441 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
5442 !CheckOverridingFunctionAttributes(MD, OldMD) &&
5443 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
5444 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
5445 hasDeletedOverridenMethods |= OldMD->isDeleted();
5446 hasNonDeletedOverridenMethods |= !OldMD->isDeleted();
5453 if (hasDeletedOverridenMethods && !MD->isDeleted()) {
5454 ReportOverrides(*this, diag::err_non_deleted_override, MD, OEK_Deleted);
5456 if (hasNonDeletedOverridenMethods && MD->isDeleted()) {
5457 ReportOverrides(*this, diag::err_deleted_override, MD, OEK_NonDeleted);
5464 // Struct for holding all of the extra arguments needed by
5465 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
5466 struct ActOnFDArgs {
5469 MultiTemplateParamsArg TemplateParamLists;
5476 // Callback to only accept typo corrections that have a non-zero edit distance.
5477 // Also only accept corrections that have the same parent decl.
5478 class DifferentNameValidatorCCC : public CorrectionCandidateCallback {
5480 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD,
5481 CXXRecordDecl *Parent)
5482 : Context(Context), OriginalFD(TypoFD),
5483 ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {}
5485 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
5486 if (candidate.getEditDistance() == 0)
5489 SmallVector<unsigned, 1> MismatchedParams;
5490 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(),
5491 CDeclEnd = candidate.end();
5492 CDecl != CDeclEnd; ++CDecl) {
5493 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
5495 if (FD && !FD->hasBody() &&
5496 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) {
5497 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
5498 CXXRecordDecl *Parent = MD->getParent();
5499 if (Parent && Parent->getCanonicalDecl() == ExpectedParent)
5501 } else if (!ExpectedParent) {
5511 ASTContext &Context;
5512 FunctionDecl *OriginalFD;
5513 CXXRecordDecl *ExpectedParent;
5518 /// \brief Generate diagnostics for an invalid function redeclaration.
5520 /// This routine handles generating the diagnostic messages for an invalid
5521 /// function redeclaration, including finding possible similar declarations
5522 /// or performing typo correction if there are no previous declarations with
5525 /// Returns a NamedDecl iff typo correction was performed and substituting in
5526 /// the new declaration name does not cause new errors.
5527 static NamedDecl* DiagnoseInvalidRedeclaration(
5528 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
5529 ActOnFDArgs &ExtraArgs) {
5530 NamedDecl *Result = NULL;
5531 DeclarationName Name = NewFD->getDeclName();
5532 DeclContext *NewDC = NewFD->getDeclContext();
5533 LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
5534 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
5535 SmallVector<unsigned, 1> MismatchedParams;
5536 SmallVector<std::pair<FunctionDecl *, unsigned>, 1> NearMatches;
5537 TypoCorrection Correction;
5538 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus &&
5539 ExtraArgs.D.getDeclSpec().isFriendSpecified());
5540 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend
5541 : diag::err_member_def_does_not_match;
5543 NewFD->setInvalidDecl();
5544 SemaRef.LookupQualifiedName(Prev, NewDC);
5545 assert(!Prev.isAmbiguous() &&
5546 "Cannot have an ambiguity in previous-declaration lookup");
5547 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
5548 DifferentNameValidatorCCC Validator(SemaRef.Context, NewFD,
5549 MD ? MD->getParent() : 0);
5550 if (!Prev.empty()) {
5551 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
5552 Func != FuncEnd; ++Func) {
5553 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
5555 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
5556 // Add 1 to the index so that 0 can mean the mismatch didn't
5557 // involve a parameter
5559 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
5560 NearMatches.push_back(std::make_pair(FD, ParamNum));
5563 // If the qualified name lookup yielded nothing, try typo correction
5564 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(),
5565 Prev.getLookupKind(), 0, 0,
5566 Validator, NewDC))) {
5568 Sema::SFINAETrap Trap(SemaRef);
5570 // Set up everything for the call to ActOnFunctionDeclarator
5571 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
5572 ExtraArgs.D.getIdentifierLoc());
5574 Previous.setLookupName(Correction.getCorrection());
5575 for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
5576 CDeclEnd = Correction.end();
5577 CDecl != CDeclEnd; ++CDecl) {
5578 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
5579 if (FD && !FD->hasBody() &&
5580 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
5581 Previous.addDecl(FD);
5584 bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
5585 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the
5586 // pieces need to verify the typo-corrected C++ declaraction and hopefully
5587 // eliminate the need for the parameter pack ExtraArgs.
5588 Result = SemaRef.ActOnFunctionDeclarator(
5589 ExtraArgs.S, ExtraArgs.D,
5590 Correction.getCorrectionDecl()->getDeclContext(),
5591 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists,
5592 ExtraArgs.AddToScope);
5593 if (Trap.hasErrorOccurred()) {
5594 // Pretend the typo correction never occurred
5595 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
5596 ExtraArgs.D.getIdentifierLoc());
5597 ExtraArgs.D.setRedeclaration(wasRedeclaration);
5599 Previous.setLookupName(Name);
5602 for (LookupResult::iterator Func = Previous.begin(),
5603 FuncEnd = Previous.end();
5604 Func != FuncEnd; ++Func) {
5605 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func))
5606 NearMatches.push_back(std::make_pair(FD, 0));
5609 if (NearMatches.empty()) {
5610 // Ignore the correction if it didn't yield any close FunctionDecl matches
5611 Correction = TypoCorrection();
5613 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest
5614 : diag::err_member_def_does_not_match_suggest;
5619 // FIXME: use Correction.getCorrectionRange() instead of computing the range
5620 // here. This requires passing in the CXXScopeSpec to CorrectTypo which in
5621 // turn causes the correction to fully qualify the name. If we fix
5622 // CorrectTypo to minimally qualify then this change should be good.
5623 SourceRange FixItLoc(NewFD->getLocation());
5624 CXXScopeSpec &SS = ExtraArgs.D.getCXXScopeSpec();
5625 if (Correction.getCorrectionSpecifier() && SS.isValid())
5626 FixItLoc.setBegin(SS.getBeginLoc());
5627 SemaRef.Diag(NewFD->getLocStart(), DiagMsg)
5628 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts())
5629 << FixItHint::CreateReplacement(
5630 FixItLoc, Correction.getAsString(SemaRef.getLangOpts()));
5632 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
5633 << Name << NewDC << NewFD->getLocation();
5636 bool NewFDisConst = false;
5637 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
5638 NewFDisConst = NewMD->isConst();
5640 for (SmallVector<std::pair<FunctionDecl *, unsigned>, 1>::iterator
5641 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
5642 NearMatch != NearMatchEnd; ++NearMatch) {
5643 FunctionDecl *FD = NearMatch->first;
5644 bool FDisConst = false;
5645 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
5646 FDisConst = MD->isConst();
5648 if (unsigned Idx = NearMatch->second) {
5649 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
5650 SourceLocation Loc = FDParam->getTypeSpecStartLoc();
5651 if (Loc.isInvalid()) Loc = FD->getLocation();
5652 SemaRef.Diag(Loc, diag::note_member_def_close_param_match)
5653 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType();
5654 } else if (Correction) {
5655 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl)
5656 << Correction.getQuoted(SemaRef.getLangOpts());
5657 } else if (FDisConst != NewFDisConst) {
5658 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
5659 << NewFDisConst << FD->getSourceRange().getEnd();
5661 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match);
5666 static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef,
5668 switch (D.getDeclSpec().getStorageClassSpec()) {
5669 default: llvm_unreachable("Unknown storage class!");
5670 case DeclSpec::SCS_auto:
5671 case DeclSpec::SCS_register:
5672 case DeclSpec::SCS_mutable:
5673 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5674 diag::err_typecheck_sclass_func);
5677 case DeclSpec::SCS_unspecified: break;
5678 case DeclSpec::SCS_extern:
5679 if (D.getDeclSpec().isExternInLinkageSpec())
5682 case DeclSpec::SCS_static: {
5683 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
5685 // The declaration of an identifier for a function that has
5686 // block scope shall have no explicit storage-class specifier
5687 // other than extern
5688 // See also (C++ [dcl.stc]p4).
5689 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
5690 diag::err_static_block_func);
5695 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
5698 // No explicit storage class has already been returned
5702 static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
5703 DeclContext *DC, QualType &R,
5704 TypeSourceInfo *TInfo,
5705 FunctionDecl::StorageClass SC,
5706 bool &IsVirtualOkay) {
5707 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
5708 DeclarationName Name = NameInfo.getName();
5710 FunctionDecl *NewFD = 0;
5711 bool isInline = D.getDeclSpec().isInlineSpecified();
5713 if (!SemaRef.getLangOpts().CPlusPlus) {
5714 // Determine whether the function was written with a
5715 // prototype. This true when:
5716 // - there is a prototype in the declarator, or
5717 // - the type R of the function is some kind of typedef or other reference
5718 // to a type name (which eventually refers to a function type).
5720 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
5721 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
5723 NewFD = FunctionDecl::Create(SemaRef.Context, DC,
5724 D.getLocStart(), NameInfo, R,
5725 TInfo, SC, isInline,
5726 HasPrototype, false);
5727 if (D.isInvalidType())
5728 NewFD->setInvalidDecl();
5730 // Set the lexical context.
5731 NewFD->setLexicalDeclContext(SemaRef.CurContext);
5736 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
5737 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
5739 // Check that the return type is not an abstract class type.
5740 // For record types, this is done by the AbstractClassUsageDiagnoser once
5741 // the class has been completely parsed.
5742 if (!DC->isRecord() &&
5743 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(),
5744 R->getAs<FunctionType>()->getResultType(),
5745 diag::err_abstract_type_in_decl,
5746 SemaRef.AbstractReturnType))
5749 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
5750 // This is a C++ constructor declaration.
5751 assert(DC->isRecord() &&
5752 "Constructors can only be declared in a member context");
5754 R = SemaRef.CheckConstructorDeclarator(D, R, SC);
5755 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
5756 D.getLocStart(), NameInfo,
5757 R, TInfo, isExplicit, isInline,
5758 /*isImplicitlyDeclared=*/false,
5761 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
5762 // This is a C++ destructor declaration.
5763 if (DC->isRecord()) {
5764 R = SemaRef.CheckDestructorDeclarator(D, R, SC);
5765 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
5766 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
5767 SemaRef.Context, Record,
5769 NameInfo, R, TInfo, isInline,
5770 /*isImplicitlyDeclared=*/false);
5772 // If the class is complete, then we now create the implicit exception
5773 // specification. If the class is incomplete or dependent, we can't do
5775 if (SemaRef.getLangOpts().CPlusPlus11 && !Record->isDependentType() &&
5776 Record->getDefinition() && !Record->isBeingDefined() &&
5777 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
5778 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
5781 IsVirtualOkay = true;
5785 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
5788 // Create a FunctionDecl to satisfy the function definition parsing
5790 return FunctionDecl::Create(SemaRef.Context, DC,
5792 D.getIdentifierLoc(), Name, R, TInfo,
5794 /*hasPrototype=*/true, isConstexpr);
5797 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
5798 if (!DC->isRecord()) {
5799 SemaRef.Diag(D.getIdentifierLoc(),
5800 diag::err_conv_function_not_member);
5804 SemaRef.CheckConversionDeclarator(D, R, SC);
5805 IsVirtualOkay = true;
5806 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
5807 D.getLocStart(), NameInfo,
5808 R, TInfo, isInline, isExplicit,
5809 isConstexpr, SourceLocation());
5811 } else if (DC->isRecord()) {
5812 // If the name of the function is the same as the name of the record,
5813 // then this must be an invalid constructor that has a return type.
5814 // (The parser checks for a return type and makes the declarator a
5815 // constructor if it has no return type).
5816 if (Name.getAsIdentifierInfo() &&
5817 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
5818 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
5819 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
5820 << SourceRange(D.getIdentifierLoc());
5824 // This is a C++ method declaration.
5825 CXXMethodDecl *Ret = CXXMethodDecl::Create(SemaRef.Context,
5826 cast<CXXRecordDecl>(DC),
5827 D.getLocStart(), NameInfo, R,
5828 TInfo, SC, isInline,
5829 isConstexpr, SourceLocation());
5830 IsVirtualOkay = !Ret->isStatic();
5833 // Determine whether the function was written with a
5834 // prototype. This true when:
5835 // - we're in C++ (where every function has a prototype),
5836 return FunctionDecl::Create(SemaRef.Context, DC,
5838 NameInfo, R, TInfo, SC, isInline,
5839 true/*HasPrototype*/, isConstexpr);
5843 void Sema::checkVoidParamDecl(ParmVarDecl *Param) {
5844 // In C++, the empty parameter-type-list must be spelled "void"; a
5845 // typedef of void is not permitted.
5846 if (getLangOpts().CPlusPlus &&
5847 Param->getType().getUnqualifiedType() != Context.VoidTy) {
5848 bool IsTypeAlias = false;
5849 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>())
5850 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl());
5851 else if (const TemplateSpecializationType *TST =
5852 Param->getType()->getAs<TemplateSpecializationType>())
5853 IsTypeAlias = TST->isTypeAlias();
5854 Diag(Param->getLocation(), diag::err_param_typedef_of_void)
5860 Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
5861 TypeSourceInfo *TInfo, LookupResult &Previous,
5862 MultiTemplateParamsArg TemplateParamLists,
5864 QualType R = TInfo->getType();
5866 assert(R.getTypePtr()->isFunctionType());
5868 // TODO: consider using NameInfo for diagnostic.
5869 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
5870 DeclarationName Name = NameInfo.getName();
5871 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D);
5873 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
5874 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
5875 diag::err_invalid_thread)
5876 << DeclSpec::getSpecifierName(TSCS);
5878 // Do not allow returning a objc interface by-value.
5879 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
5880 Diag(D.getIdentifierLoc(),
5881 diag::err_object_cannot_be_passed_returned_by_value) << 0
5882 << R->getAs<FunctionType>()->getResultType()
5883 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*");
5885 QualType T = R->getAs<FunctionType>()->getResultType();
5886 T = Context.getObjCObjectPointerType(T);
5887 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) {
5888 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
5889 R = Context.getFunctionType(T,
5890 ArrayRef<QualType>(FPT->arg_type_begin(),
5894 else if (isa<FunctionNoProtoType>(R))
5895 R = Context.getFunctionNoProtoType(T);
5898 bool isFriend = false;
5899 FunctionTemplateDecl *FunctionTemplate = 0;
5900 bool isExplicitSpecialization = false;
5901 bool isFunctionTemplateSpecialization = false;
5903 bool isDependentClassScopeExplicitSpecialization = false;
5904 bool HasExplicitTemplateArgs = false;
5905 TemplateArgumentListInfo TemplateArgs;
5907 bool isVirtualOkay = false;
5909 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
5911 if (!NewFD) return 0;
5913 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer())
5914 NewFD->setTopLevelDeclInObjCContainer();
5916 if (getLangOpts().CPlusPlus) {
5917 bool isInline = D.getDeclSpec().isInlineSpecified();
5918 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
5919 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
5920 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
5921 isFriend = D.getDeclSpec().isFriendSpecified();
5922 if (isFriend && !isInline && D.isFunctionDefinition()) {
5923 // C++ [class.friend]p5
5924 // A function can be defined in a friend declaration of a
5925 // class . . . . Such a function is implicitly inline.
5926 NewFD->setImplicitlyInline();
5929 // If this is a method defined in an __interface, and is not a constructor
5930 // or an overloaded operator, then set the pure flag (isVirtual will already
5932 if (const CXXRecordDecl *Parent =
5933 dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) {
5934 if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided())
5935 NewFD->setPure(true);
5938 SetNestedNameSpecifier(NewFD, D);
5939 isExplicitSpecialization = false;
5940 isFunctionTemplateSpecialization = false;
5941 if (D.isInvalidType())
5942 NewFD->setInvalidDecl();
5944 // Set the lexical context. If the declarator has a C++
5945 // scope specifier, or is the object of a friend declaration, the
5946 // lexical context will be different from the semantic context.
5947 NewFD->setLexicalDeclContext(CurContext);
5949 // Match up the template parameter lists with the scope specifier, then
5950 // determine whether we have a template or a template specialization.
5951 bool Invalid = false;
5952 if (TemplateParameterList *TemplateParams
5953 = MatchTemplateParametersToScopeSpecifier(
5954 D.getDeclSpec().getLocStart(),
5955 D.getIdentifierLoc(),
5956 D.getCXXScopeSpec(),
5957 TemplateParamLists.data(),
5958 TemplateParamLists.size(),
5960 isExplicitSpecialization,
5962 if (TemplateParams->size() > 0) {
5963 // This is a function template
5965 // Check that we can declare a template here.
5966 if (CheckTemplateDeclScope(S, TemplateParams))
5969 // A destructor cannot be a template.
5970 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
5971 Diag(NewFD->getLocation(), diag::err_destructor_template);
5975 // If we're adding a template to a dependent context, we may need to
5976 // rebuilding some of the types used within the template parameter list,
5977 // now that we know what the current instantiation is.
5978 if (DC->isDependentContext()) {
5979 ContextRAII SavedContext(*this, DC);
5980 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
5985 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
5986 NewFD->getLocation(),
5987 Name, TemplateParams,
5989 FunctionTemplate->setLexicalDeclContext(CurContext);
5990 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
5992 // For source fidelity, store the other template param lists.
5993 if (TemplateParamLists.size() > 1) {
5994 NewFD->setTemplateParameterListsInfo(Context,
5995 TemplateParamLists.size() - 1,
5996 TemplateParamLists.data());
5999 // This is a function template specialization.
6000 isFunctionTemplateSpecialization = true;
6001 // For source fidelity, store all the template param lists.
6002 NewFD->setTemplateParameterListsInfo(Context,
6003 TemplateParamLists.size(),
6004 TemplateParamLists.data());
6006 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
6008 // We want to remove the "template<>", found here.
6009 SourceRange RemoveRange = TemplateParams->getSourceRange();
6011 // If we remove the template<> and the name is not a
6012 // template-id, we're actually silently creating a problem:
6013 // the friend declaration will refer to an untemplated decl,
6014 // and clearly the user wants a template specialization. So
6015 // we need to insert '<>' after the name.
6016 SourceLocation InsertLoc;
6017 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
6018 InsertLoc = D.getName().getSourceRange().getEnd();
6019 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
6022 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
6023 << Name << RemoveRange
6024 << FixItHint::CreateRemoval(RemoveRange)
6025 << FixItHint::CreateInsertion(InsertLoc, "<>");
6030 // All template param lists were matched against the scope specifier:
6031 // this is NOT (an explicit specialization of) a template.
6032 if (TemplateParamLists.size() > 0)
6033 // For source fidelity, store all the template param lists.
6034 NewFD->setTemplateParameterListsInfo(Context,
6035 TemplateParamLists.size(),
6036 TemplateParamLists.data());
6040 NewFD->setInvalidDecl();
6041 if (FunctionTemplate)
6042 FunctionTemplate->setInvalidDecl();
6045 // C++ [dcl.fct.spec]p5:
6046 // The virtual specifier shall only be used in declarations of
6047 // nonstatic class member functions that appear within a
6048 // member-specification of a class declaration; see 10.3.
6050 if (isVirtual && !NewFD->isInvalidDecl()) {
6051 if (!isVirtualOkay) {
6052 Diag(D.getDeclSpec().getVirtualSpecLoc(),
6053 diag::err_virtual_non_function);
6054 } else if (!CurContext->isRecord()) {
6055 // 'virtual' was specified outside of the class.
6056 Diag(D.getDeclSpec().getVirtualSpecLoc(),
6057 diag::err_virtual_out_of_class)
6058 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
6059 } else if (NewFD->getDescribedFunctionTemplate()) {
6060 // C++ [temp.mem]p3:
6061 // A member function template shall not be virtual.
6062 Diag(D.getDeclSpec().getVirtualSpecLoc(),
6063 diag::err_virtual_member_function_template)
6064 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
6066 // Okay: Add virtual to the method.
6067 NewFD->setVirtualAsWritten(true);
6070 if (getLangOpts().CPlusPlus1y &&
6071 NewFD->getResultType()->isUndeducedType())
6072 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_auto_fn_virtual);
6075 // C++ [dcl.fct.spec]p3:
6076 // The inline specifier shall not appear on a block scope function
6078 if (isInline && !NewFD->isInvalidDecl()) {
6079 if (CurContext->isFunctionOrMethod()) {
6080 // 'inline' is not allowed on block scope function declaration.
6081 Diag(D.getDeclSpec().getInlineSpecLoc(),
6082 diag::err_inline_declaration_block_scope) << Name
6083 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
6087 // C++ [dcl.fct.spec]p6:
6088 // The explicit specifier shall be used only in the declaration of a
6089 // constructor or conversion function within its class definition;
6090 // see 12.3.1 and 12.3.2.
6091 if (isExplicit && !NewFD->isInvalidDecl()) {
6092 if (!CurContext->isRecord()) {
6093 // 'explicit' was specified outside of the class.
6094 Diag(D.getDeclSpec().getExplicitSpecLoc(),
6095 diag::err_explicit_out_of_class)
6096 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
6097 } else if (!isa<CXXConstructorDecl>(NewFD) &&
6098 !isa<CXXConversionDecl>(NewFD)) {
6099 // 'explicit' was specified on a function that wasn't a constructor
6100 // or conversion function.
6101 Diag(D.getDeclSpec().getExplicitSpecLoc(),
6102 diag::err_explicit_non_ctor_or_conv_function)
6103 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
6108 // C++11 [dcl.constexpr]p2: constexpr functions and constexpr constructors
6109 // are implicitly inline.
6110 NewFD->setImplicitlyInline();
6112 // C++11 [dcl.constexpr]p3: functions declared constexpr are required to
6113 // be either constructors or to return a literal type. Therefore,
6114 // destructors cannot be declared constexpr.
6115 if (isa<CXXDestructorDecl>(NewFD))
6116 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
6119 // If __module_private__ was specified, mark the function accordingly.
6120 if (D.getDeclSpec().isModulePrivateSpecified()) {
6121 if (isFunctionTemplateSpecialization) {
6122 SourceLocation ModulePrivateLoc
6123 = D.getDeclSpec().getModulePrivateSpecLoc();
6124 Diag(ModulePrivateLoc, diag::err_module_private_specialization)
6126 << FixItHint::CreateRemoval(ModulePrivateLoc);
6128 NewFD->setModulePrivate();
6129 if (FunctionTemplate)
6130 FunctionTemplate->setModulePrivate();
6135 // For now, claim that the objects have no previous declaration.
6136 if (FunctionTemplate) {
6137 FunctionTemplate->setObjectOfFriendDecl(false);
6138 FunctionTemplate->setAccess(AS_public);
6140 NewFD->setObjectOfFriendDecl(false);
6141 NewFD->setAccess(AS_public);
6144 // If a function is defined as defaulted or deleted, mark it as such now.
6145 switch (D.getFunctionDefinitionKind()) {
6146 case FDK_Declaration:
6147 case FDK_Definition:
6151 NewFD->setDefaulted();
6155 NewFD->setDeletedAsWritten();
6159 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
6160 D.isFunctionDefinition()) {
6161 // C++ [class.mfct]p2:
6162 // A member function may be defined (8.4) in its class definition, in
6163 // which case it is an inline member function (7.1.2)
6164 NewFD->setImplicitlyInline();
6167 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
6168 !CurContext->isRecord()) {
6169 // C++ [class.static]p1:
6170 // A data or function member of a class may be declared static
6171 // in a class definition, in which case it is a static member of
6174 // Complain about the 'static' specifier if it's on an out-of-line
6175 // member function definition.
6176 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6177 diag::err_static_out_of_line)
6178 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6181 // C++11 [except.spec]p15:
6182 // A deallocation function with no exception-specification is treated
6183 // as if it were specified with noexcept(true).
6184 const FunctionProtoType *FPT = R->getAs<FunctionProtoType>();
6185 if ((Name.getCXXOverloadedOperator() == OO_Delete ||
6186 Name.getCXXOverloadedOperator() == OO_Array_Delete) &&
6187 getLangOpts().CPlusPlus11 && FPT && !FPT->hasExceptionSpec()) {
6188 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
6189 EPI.ExceptionSpecType = EST_BasicNoexcept;
6190 NewFD->setType(Context.getFunctionType(FPT->getResultType(),
6191 ArrayRef<QualType>(FPT->arg_type_begin(),
6197 // Filter out previous declarations that don't match the scope.
6198 FilterLookupForScope(Previous, DC, S, shouldConsiderLinkage(NewFD),
6199 isExplicitSpecialization ||
6200 isFunctionTemplateSpecialization);
6202 // Handle GNU asm-label extension (encoded as an attribute).
6203 if (Expr *E = (Expr*) D.getAsmLabel()) {
6204 // The parser guarantees this is a string.
6205 StringLiteral *SE = cast<StringLiteral>(E);
6206 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
6208 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
6209 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
6210 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
6211 if (I != ExtnameUndeclaredIdentifiers.end()) {
6212 NewFD->addAttr(I->second);
6213 ExtnameUndeclaredIdentifiers.erase(I);
6217 // Copy the parameter declarations from the declarator D to the function
6218 // declaration NewFD, if they are available. First scavenge them into Params.
6219 SmallVector<ParmVarDecl*, 16> Params;
6220 if (D.isFunctionDeclarator()) {
6221 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
6223 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
6224 // function that takes no arguments, not a function that takes a
6225 // single void argument.
6226 // We let through "const void" here because Sema::GetTypeForDeclarator
6227 // already checks for that case.
6228 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
6229 FTI.ArgInfo[0].Param &&
6230 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
6231 // Empty arg list, don't push any params.
6232 checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param));
6233 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
6234 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
6235 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
6236 assert(Param->getDeclContext() != NewFD && "Was set before ?");
6237 Param->setDeclContext(NewFD);
6238 Params.push_back(Param);
6240 if (Param->isInvalidDecl())
6241 NewFD->setInvalidDecl();
6245 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
6246 // When we're declaring a function with a typedef, typeof, etc as in the
6247 // following example, we'll need to synthesize (unnamed)
6248 // parameters for use in the declaration.
6251 // typedef void fn(int);
6255 // Synthesize a parameter for each argument type.
6256 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
6257 AE = FT->arg_type_end(); AI != AE; ++AI) {
6258 ParmVarDecl *Param =
6259 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
6260 Param->setScopeInfo(0, Params.size());
6261 Params.push_back(Param);
6264 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
6265 "Should not need args for typedef of non-prototype fn");
6268 // Finally, we know we have the right number of parameters, install them.
6269 NewFD->setParams(Params);
6271 // Find all anonymous symbols defined during the declaration of this function
6272 // and add to NewFD. This lets us track decls such 'enum Y' in:
6274 // void f(enum Y {AA} x) {}
6276 // which would otherwise incorrectly end up in the translation unit scope.
6277 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope);
6278 DeclsInPrototypeScope.clear();
6280 if (D.getDeclSpec().isNoreturnSpecified())
6282 ::new(Context) C11NoReturnAttr(D.getDeclSpec().getNoreturnSpecLoc(),
6285 // Process the non-inheritable attributes on this declaration.
6286 ProcessDeclAttributes(S, NewFD, D,
6287 /*NonInheritable=*/true, /*Inheritable=*/false);
6289 // Functions returning a variably modified type violate C99 6.7.5.2p2
6290 // because all functions have linkage.
6291 if (!NewFD->isInvalidDecl() &&
6292 NewFD->getResultType()->isVariablyModifiedType()) {
6293 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
6294 NewFD->setInvalidDecl();
6297 // Handle attributes.
6298 ProcessDeclAttributes(S, NewFD, D,
6299 /*NonInheritable=*/false, /*Inheritable=*/true);
6301 QualType RetType = NewFD->getResultType();
6302 const CXXRecordDecl *Ret = RetType->isRecordType() ?
6303 RetType->getAsCXXRecordDecl() : RetType->getPointeeCXXRecordDecl();
6304 if (!NewFD->isInvalidDecl() && !NewFD->hasAttr<WarnUnusedResultAttr>() &&
6305 Ret && Ret->hasAttr<WarnUnusedResultAttr>()) {
6306 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
6307 if (!(MD && MD->getCorrespondingMethodInClass(Ret, true))) {
6308 NewFD->addAttr(new (Context) WarnUnusedResultAttr(SourceRange(),
6313 if (!getLangOpts().CPlusPlus) {
6314 // Perform semantic checking on the function declaration.
6315 bool isExplicitSpecialization=false;
6316 if (!NewFD->isInvalidDecl()) {
6317 if (NewFD->isMain())
6318 CheckMain(NewFD, D.getDeclSpec());
6319 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
6320 isExplicitSpecialization));
6322 // Make graceful recovery from an invalid redeclaration.
6323 else if (!Previous.empty())
6324 D.setRedeclaration(true);
6325 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
6326 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
6327 "previous declaration set still overloaded");
6329 // If the declarator is a template-id, translate the parser's template
6330 // argument list into our AST format.
6331 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
6332 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
6333 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
6334 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
6335 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
6336 TemplateId->NumArgs);
6337 translateTemplateArguments(TemplateArgsPtr,
6340 HasExplicitTemplateArgs = true;
6342 if (NewFD->isInvalidDecl()) {
6343 HasExplicitTemplateArgs = false;
6344 } else if (FunctionTemplate) {
6345 // Function template with explicit template arguments.
6346 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
6347 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
6349 HasExplicitTemplateArgs = false;
6350 } else if (!isFunctionTemplateSpecialization &&
6351 !D.getDeclSpec().isFriendSpecified()) {
6352 // We have encountered something that the user meant to be a
6353 // specialization (because it has explicitly-specified template
6354 // arguments) but that was not introduced with a "template<>" (or had
6355 // too few of them).
6356 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
6357 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
6358 << FixItHint::CreateInsertion(
6359 D.getDeclSpec().getLocStart(),
6361 isFunctionTemplateSpecialization = true;
6363 // "friend void foo<>(int);" is an implicit specialization decl.
6364 isFunctionTemplateSpecialization = true;
6366 } else if (isFriend && isFunctionTemplateSpecialization) {
6367 // This combination is only possible in a recovery case; the user
6368 // wrote something like:
6369 // template <> friend void foo(int);
6370 // which we're recovering from as if the user had written:
6371 // friend void foo<>(int);
6372 // Go ahead and fake up a template id.
6373 HasExplicitTemplateArgs = true;
6374 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
6375 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
6378 // If it's a friend (and only if it's a friend), it's possible
6379 // that either the specialized function type or the specialized
6380 // template is dependent, and therefore matching will fail. In
6381 // this case, don't check the specialization yet.
6382 bool InstantiationDependent = false;
6383 if (isFunctionTemplateSpecialization && isFriend &&
6384 (NewFD->getType()->isDependentType() || DC->isDependentContext() ||
6385 TemplateSpecializationType::anyDependentTemplateArguments(
6386 TemplateArgs.getArgumentArray(), TemplateArgs.size(),
6387 InstantiationDependent))) {
6388 assert(HasExplicitTemplateArgs &&
6389 "friend function specialization without template args");
6390 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
6392 NewFD->setInvalidDecl();
6393 } else if (isFunctionTemplateSpecialization) {
6394 if (CurContext->isDependentContext() && CurContext->isRecord()
6396 isDependentClassScopeExplicitSpecialization = true;
6397 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
6398 diag::ext_function_specialization_in_class :
6399 diag::err_function_specialization_in_class)
6400 << NewFD->getDeclName();
6401 } else if (CheckFunctionTemplateSpecialization(NewFD,
6402 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
6404 NewFD->setInvalidDecl();
6407 // A storage-class-specifier shall not be specified in an explicit
6408 // specialization (14.7.3)
6409 if (SC != SC_None) {
6410 if (SC != NewFD->getTemplateSpecializationInfo()->getTemplate()->getTemplatedDecl()->getStorageClass())
6411 Diag(NewFD->getLocation(),
6412 diag::err_explicit_specialization_inconsistent_storage_class)
6414 << FixItHint::CreateRemoval(
6415 D.getDeclSpec().getStorageClassSpecLoc());
6418 Diag(NewFD->getLocation(),
6419 diag::ext_explicit_specialization_storage_class)
6420 << FixItHint::CreateRemoval(
6421 D.getDeclSpec().getStorageClassSpecLoc());
6424 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
6425 if (CheckMemberSpecialization(NewFD, Previous))
6426 NewFD->setInvalidDecl();
6429 // Perform semantic checking on the function declaration.
6430 if (!isDependentClassScopeExplicitSpecialization) {
6431 if (NewFD->isInvalidDecl()) {
6432 // If this is a class member, mark the class invalid immediately.
6433 // This avoids some consistency errors later.
6434 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD))
6435 methodDecl->getParent()->setInvalidDecl();
6437 if (NewFD->isMain())
6438 CheckMain(NewFD, D.getDeclSpec());
6439 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
6440 isExplicitSpecialization));
6444 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
6445 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
6446 "previous declaration set still overloaded");
6448 NamedDecl *PrincipalDecl = (FunctionTemplate
6449 ? cast<NamedDecl>(FunctionTemplate)
6452 if (isFriend && D.isRedeclaration()) {
6453 AccessSpecifier Access = AS_public;
6454 if (!NewFD->isInvalidDecl())
6455 Access = NewFD->getPreviousDecl()->getAccess();
6457 NewFD->setAccess(Access);
6458 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
6460 PrincipalDecl->setObjectOfFriendDecl(true);
6463 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
6464 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
6465 PrincipalDecl->setNonMemberOperator();
6467 // If we have a function template, check the template parameter
6468 // list. This will check and merge default template arguments.
6469 if (FunctionTemplate) {
6470 FunctionTemplateDecl *PrevTemplate =
6471 FunctionTemplate->getPreviousDecl();
6472 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
6473 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0,
6474 D.getDeclSpec().isFriendSpecified()
6475 ? (D.isFunctionDefinition()
6476 ? TPC_FriendFunctionTemplateDefinition
6477 : TPC_FriendFunctionTemplate)
6478 : (D.getCXXScopeSpec().isSet() &&
6479 DC && DC->isRecord() &&
6480 DC->isDependentContext())
6481 ? TPC_ClassTemplateMember
6482 : TPC_FunctionTemplate);
6485 if (NewFD->isInvalidDecl()) {
6486 // Ignore all the rest of this.
6487 } else if (!D.isRedeclaration()) {
6488 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
6490 // Fake up an access specifier if it's supposed to be a class member.
6491 if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
6492 NewFD->setAccess(AS_public);
6494 // Qualified decls generally require a previous declaration.
6495 if (D.getCXXScopeSpec().isSet()) {
6496 // ...with the major exception of templated-scope or
6497 // dependent-scope friend declarations.
6499 // TODO: we currently also suppress this check in dependent
6500 // contexts because (1) the parameter depth will be off when
6501 // matching friend templates and (2) we might actually be
6502 // selecting a friend based on a dependent factor. But there
6503 // are situations where these conditions don't apply and we
6504 // can actually do this check immediately.
6506 (TemplateParamLists.size() ||
6507 D.getCXXScopeSpec().getScopeRep()->isDependent() ||
6508 CurContext->isDependentContext())) {
6511 // The user tried to provide an out-of-line definition for a
6512 // function that is a member of a class or namespace, but there
6513 // was no such member function declared (C++ [class.mfct]p2,
6514 // C++ [namespace.memdef]p2). For example:
6520 // void X::f() { } // ill-formed
6522 // Complain about this problem, and attempt to suggest close
6523 // matches (e.g., those that differ only in cv-qualifiers and
6524 // whether the parameter types are references).
6526 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
6529 AddToScope = ExtraArgs.AddToScope;
6534 // Unqualified local friend declarations are required to resolve
6536 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
6537 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
6540 AddToScope = ExtraArgs.AddToScope;
6545 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() &&
6546 !isFriend && !isFunctionTemplateSpecialization &&
6547 !isExplicitSpecialization) {
6548 // An out-of-line member function declaration must also be a
6549 // definition (C++ [dcl.meaning]p1).
6550 // Note that this is not the case for explicit specializations of
6551 // function templates or member functions of class templates, per
6552 // C++ [temp.expl.spec]p2. We also allow these declarations as an
6553 // extension for compatibility with old SWIG code which likes to
6555 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
6556 << D.getCXXScopeSpec().getRange();
6560 ProcessPragmaWeak(S, NewFD);
6561 checkAttributesAfterMerging(*this, *NewFD);
6563 AddKnownFunctionAttributes(NewFD);
6565 if (NewFD->hasAttr<OverloadableAttr>() &&
6566 !NewFD->getType()->getAs<FunctionProtoType>()) {
6567 Diag(NewFD->getLocation(),
6568 diag::err_attribute_overloadable_no_prototype)
6571 // Turn this into a variadic function with no parameters.
6572 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
6573 FunctionProtoType::ExtProtoInfo EPI;
6574 EPI.Variadic = true;
6575 EPI.ExtInfo = FT->getExtInfo();
6577 QualType R = Context.getFunctionType(FT->getResultType(), None, EPI);
6581 // If there's a #pragma GCC visibility in scope, and this isn't a class
6582 // member, set the visibility of this function.
6583 if (!DC->isRecord() && NewFD->hasExternalLinkage())
6584 AddPushedVisibilityAttribute(NewFD);
6586 // If there's a #pragma clang arc_cf_code_audited in scope, consider
6587 // marking the function.
6588 AddCFAuditedAttribute(NewFD);
6590 // If this is a locally-scoped extern C function, update the
6591 // map of such names.
6592 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
6593 && !NewFD->isInvalidDecl())
6594 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
6596 // Set this FunctionDecl's range up to the right paren.
6597 NewFD->setRangeEnd(D.getSourceRange().getEnd());
6599 if (getLangOpts().CPlusPlus) {
6600 if (FunctionTemplate) {
6601 if (NewFD->isInvalidDecl())
6602 FunctionTemplate->setInvalidDecl();
6603 return FunctionTemplate;
6607 if (NewFD->hasAttr<OpenCLKernelAttr>()) {
6608 // OpenCL v1.2 s6.8 static is invalid for kernel functions.
6609 if ((getLangOpts().OpenCLVersion >= 120)
6610 && (SC == SC_Static)) {
6611 Diag(D.getIdentifierLoc(), diag::err_static_kernel);
6615 // OpenCL v1.2, s6.9 -- Kernels can only have return type void.
6616 if (!NewFD->getResultType()->isVoidType()) {
6617 Diag(D.getIdentifierLoc(),
6618 diag::err_expected_kernel_void_return_type);
6622 for (FunctionDecl::param_iterator PI = NewFD->param_begin(),
6623 PE = NewFD->param_end(); PI != PE; ++PI) {
6624 ParmVarDecl *Param = *PI;
6625 QualType PT = Param->getType();
6627 // OpenCL v1.2 s6.9.a:
6628 // A kernel function argument cannot be declared as a
6629 // pointer to a pointer type.
6630 if (PT->isPointerType() && PT->getPointeeType()->isPointerType()) {
6631 Diag(Param->getLocation(), diag::err_opencl_ptrptr_kernel_arg);
6635 // OpenCL v1.2 s6.8 n:
6636 // A kernel function argument cannot be declared
6638 if (PT->isEventT()) {
6639 Diag(Param->getLocation(), diag::err_event_t_kernel_arg);
6645 MarkUnusedFileScopedDecl(NewFD);
6647 if (getLangOpts().CUDA)
6648 if (IdentifierInfo *II = NewFD->getIdentifier())
6649 if (!NewFD->isInvalidDecl() &&
6650 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
6651 if (II->isStr("cudaConfigureCall")) {
6652 if (!R->getAs<FunctionType>()->getResultType()->isScalarType())
6653 Diag(NewFD->getLocation(), diag::err_config_scalar_return);
6655 Context.setcudaConfigureCallDecl(NewFD);
6659 // Here we have an function template explicit specialization at class scope.
6660 // The actually specialization will be postponed to template instatiation
6661 // time via the ClassScopeFunctionSpecializationDecl node.
6662 if (isDependentClassScopeExplicitSpecialization) {
6663 ClassScopeFunctionSpecializationDecl *NewSpec =
6664 ClassScopeFunctionSpecializationDecl::Create(
6665 Context, CurContext, SourceLocation(),
6666 cast<CXXMethodDecl>(NewFD),
6667 HasExplicitTemplateArgs, TemplateArgs);
6668 CurContext->addDecl(NewSpec);
6675 /// \brief Perform semantic checking of a new function declaration.
6677 /// Performs semantic analysis of the new function declaration
6678 /// NewFD. This routine performs all semantic checking that does not
6679 /// require the actual declarator involved in the declaration, and is
6680 /// used both for the declaration of functions as they are parsed
6681 /// (called via ActOnDeclarator) and for the declaration of functions
6682 /// that have been instantiated via C++ template instantiation (called
6683 /// via InstantiateDecl).
6685 /// \param IsExplicitSpecialization whether this new function declaration is
6686 /// an explicit specialization of the previous declaration.
6688 /// This sets NewFD->isInvalidDecl() to true if there was an error.
6690 /// \returns true if the function declaration is a redeclaration.
6691 bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
6692 LookupResult &Previous,
6693 bool IsExplicitSpecialization) {
6694 assert(!NewFD->getResultType()->isVariablyModifiedType()
6695 && "Variably modified return types are not handled here");
6697 // Check for a previous declaration of this name.
6698 if (Previous.empty() && mayConflictWithNonVisibleExternC(NewFD)) {
6699 // Since we did not find anything by this name, look for a non-visible
6700 // extern "C" declaration with the same name.
6701 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
6702 = findLocallyScopedExternCDecl(NewFD->getDeclName());
6703 if (Pos != LocallyScopedExternCDecls.end())
6704 Previous.addDecl(Pos->second);
6707 // Filter out any non-conflicting previous declarations.
6708 filterNonConflictingPreviousDecls(Context, NewFD, Previous);
6710 bool Redeclaration = false;
6711 NamedDecl *OldDecl = 0;
6713 // Merge or overload the declaration with an existing declaration of
6714 // the same name, if appropriate.
6715 if (!Previous.empty()) {
6716 // Determine whether NewFD is an overload of PrevDecl or
6717 // a declaration that requires merging. If it's an overload,
6718 // there's no more work to do here; we'll just add the new
6719 // function to the scope.
6720 if (!AllowOverloadingOfFunction(Previous, Context)) {
6721 NamedDecl *Candidate = Previous.getFoundDecl();
6722 if (shouldLinkPossiblyHiddenDecl(Candidate, NewFD)) {
6723 Redeclaration = true;
6724 OldDecl = Candidate;
6727 switch (CheckOverload(S, NewFD, Previous, OldDecl,
6728 /*NewIsUsingDecl*/ false)) {
6730 Redeclaration = true;
6733 case Ovl_NonFunction:
6734 Redeclaration = true;
6738 Redeclaration = false;
6742 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
6743 // If a function name is overloadable in C, then every function
6744 // with that name must be marked "overloadable".
6745 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
6746 << Redeclaration << NewFD;
6747 NamedDecl *OverloadedDecl = 0;
6749 OverloadedDecl = OldDecl;
6750 else if (!Previous.empty())
6751 OverloadedDecl = Previous.getRepresentativeDecl();
6753 Diag(OverloadedDecl->getLocation(),
6754 diag::note_attribute_overloadable_prev_overload);
6755 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(),
6761 // C++11 [dcl.constexpr]p8:
6762 // A constexpr specifier for a non-static member function that is not
6763 // a constructor declares that member function to be const.
6765 // This needs to be delayed until we know whether this is an out-of-line
6766 // definition of a static member function.
6768 // This rule is not present in C++1y, so we produce a backwards
6769 // compatibility warning whenever it happens in C++11.
6770 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
6771 if (!getLangOpts().CPlusPlus1y && MD && MD->isConstexpr() &&
6772 !MD->isStatic() && !isa<CXXConstructorDecl>(MD) &&
6773 (MD->getTypeQualifiers() & Qualifiers::Const) == 0) {
6774 CXXMethodDecl *OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl);
6775 if (FunctionTemplateDecl *OldTD =
6776 dyn_cast_or_null<FunctionTemplateDecl>(OldDecl))
6777 OldMD = dyn_cast<CXXMethodDecl>(OldTD->getTemplatedDecl());
6778 if (!OldMD || !OldMD->isStatic()) {
6779 const FunctionProtoType *FPT =
6780 MD->getType()->castAs<FunctionProtoType>();
6781 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
6782 EPI.TypeQuals |= Qualifiers::Const;
6783 MD->setType(Context.getFunctionType(FPT->getResultType(),
6784 ArrayRef<QualType>(FPT->arg_type_begin(),
6788 // Warn that we did this, if we're not performing template instantiation.
6789 // In that case, we'll have warned already when the template was defined.
6790 if (ActiveTemplateInstantiations.empty()) {
6791 SourceLocation AddConstLoc;
6792 if (FunctionTypeLoc FTL = MD->getTypeSourceInfo()->getTypeLoc()
6793 .IgnoreParens().getAs<FunctionTypeLoc>())
6794 AddConstLoc = PP.getLocForEndOfToken(FTL.getRParenLoc());
6796 Diag(MD->getLocation(), diag::warn_cxx1y_compat_constexpr_not_const)
6797 << FixItHint::CreateInsertion(AddConstLoc, " const");
6802 if (Redeclaration) {
6803 // NewFD and OldDecl represent declarations that need to be
6805 if (MergeFunctionDecl(NewFD, OldDecl, S)) {
6806 NewFD->setInvalidDecl();
6807 return Redeclaration;
6811 Previous.addDecl(OldDecl);
6813 if (FunctionTemplateDecl *OldTemplateDecl
6814 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
6815 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
6816 FunctionTemplateDecl *NewTemplateDecl
6817 = NewFD->getDescribedFunctionTemplate();
6818 assert(NewTemplateDecl && "Template/non-template mismatch");
6819 if (CXXMethodDecl *Method
6820 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
6821 Method->setAccess(OldTemplateDecl->getAccess());
6822 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
6825 // If this is an explicit specialization of a member that is a function
6826 // template, mark it as a member specialization.
6827 if (IsExplicitSpecialization &&
6828 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
6829 NewTemplateDecl->setMemberSpecialization();
6830 assert(OldTemplateDecl->isMemberSpecialization());
6834 // This needs to happen first so that 'inline' propagates.
6835 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
6837 if (isa<CXXMethodDecl>(NewFD)) {
6838 // A valid redeclaration of a C++ method must be out-of-line,
6839 // but (unfortunately) it's not necessarily a definition
6840 // because of templates, which means that the previous
6841 // declaration is not necessarily from the class definition.
6843 // For just setting the access, that doesn't matter.
6844 CXXMethodDecl *oldMethod = cast<CXXMethodDecl>(OldDecl);
6845 NewFD->setAccess(oldMethod->getAccess());
6847 // Update the key-function state if necessary for this ABI.
6848 if (NewFD->isInlined() &&
6849 !Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline()) {
6850 // setNonKeyFunction needs to work with the original
6851 // declaration from the class definition, and isVirtual() is
6852 // just faster in that case, so map back to that now.
6853 oldMethod = cast<CXXMethodDecl>(oldMethod->getFirstDeclaration());
6854 if (oldMethod->isVirtual()) {
6855 Context.setNonKeyFunction(oldMethod);
6862 // Semantic checking for this function declaration (in isolation).
6863 if (getLangOpts().CPlusPlus) {
6864 // C++-specific checks.
6865 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
6866 CheckConstructor(Constructor);
6867 } else if (CXXDestructorDecl *Destructor =
6868 dyn_cast<CXXDestructorDecl>(NewFD)) {
6869 CXXRecordDecl *Record = Destructor->getParent();
6870 QualType ClassType = Context.getTypeDeclType(Record);
6872 // FIXME: Shouldn't we be able to perform this check even when the class
6873 // type is dependent? Both gcc and edg can handle that.
6874 if (!ClassType->isDependentType()) {
6875 DeclarationName Name
6876 = Context.DeclarationNames.getCXXDestructorName(
6877 Context.getCanonicalType(ClassType));
6878 if (NewFD->getDeclName() != Name) {
6879 Diag(NewFD->getLocation(), diag::err_destructor_name);
6880 NewFD->setInvalidDecl();
6881 return Redeclaration;
6884 } else if (CXXConversionDecl *Conversion
6885 = dyn_cast<CXXConversionDecl>(NewFD)) {
6886 ActOnConversionDeclarator(Conversion);
6889 // Find any virtual functions that this function overrides.
6890 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
6891 if (!Method->isFunctionTemplateSpecialization() &&
6892 !Method->getDescribedFunctionTemplate() &&
6893 Method->isCanonicalDecl()) {
6894 if (AddOverriddenMethods(Method->getParent(), Method)) {
6895 // If the function was marked as "static", we have a problem.
6896 if (NewFD->getStorageClass() == SC_Static) {
6897 ReportOverrides(*this, diag::err_static_overrides_virtual, Method);
6902 if (Method->isStatic())
6903 checkThisInStaticMemberFunctionType(Method);
6906 // Extra checking for C++ overloaded operators (C++ [over.oper]).
6907 if (NewFD->isOverloadedOperator() &&
6908 CheckOverloadedOperatorDeclaration(NewFD)) {
6909 NewFD->setInvalidDecl();
6910 return Redeclaration;
6913 // Extra checking for C++0x literal operators (C++0x [over.literal]).
6914 if (NewFD->getLiteralIdentifier() &&
6915 CheckLiteralOperatorDeclaration(NewFD)) {
6916 NewFD->setInvalidDecl();
6917 return Redeclaration;
6920 // In C++, check default arguments now that we have merged decls. Unless
6921 // the lexical context is the class, because in this case this is done
6922 // during delayed parsing anyway.
6923 if (!CurContext->isRecord())
6924 CheckCXXDefaultArguments(NewFD);
6926 // If this function declares a builtin function, check the type of this
6927 // declaration against the expected type for the builtin.
6928 if (unsigned BuiltinID = NewFD->getBuiltinID()) {
6929 ASTContext::GetBuiltinTypeError Error;
6930 LookupPredefedObjCSuperType(*this, S, NewFD->getIdentifier());
6931 QualType T = Context.GetBuiltinType(BuiltinID, Error);
6932 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) {
6933 // The type of this function differs from the type of the builtin,
6934 // so forget about the builtin entirely.
6935 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents);
6939 // If this function is declared as being extern "C", then check to see if
6940 // the function returns a UDT (class, struct, or union type) that is not C
6941 // compatible, and if it does, warn the user.
6942 // But, issue any diagnostic on the first declaration only.
6943 if (NewFD->isExternC() && Previous.empty()) {
6944 QualType R = NewFD->getResultType();
6945 if (R->isIncompleteType() && !R->isVoidType())
6946 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)
6948 else if (!R.isPODType(Context) && !R->isVoidType() &&
6949 !R->isObjCObjectPointerType())
6950 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R;
6953 return Redeclaration;
6956 static SourceRange getResultSourceRange(const FunctionDecl *FD) {
6957 const TypeSourceInfo *TSI = FD->getTypeSourceInfo();
6959 return SourceRange();
6961 TypeLoc TL = TSI->getTypeLoc();
6962 FunctionTypeLoc FunctionTL = TL.getAs<FunctionTypeLoc>();
6964 return SourceRange();
6966 TypeLoc ResultTL = FunctionTL.getResultLoc();
6967 if (ResultTL.getUnqualifiedLoc().getAs<BuiltinTypeLoc>())
6968 return ResultTL.getSourceRange();
6970 return SourceRange();
6973 void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
6974 // C++11 [basic.start.main]p3: A program that declares main to be inline,
6975 // static or constexpr is ill-formed.
6976 // C11 6.7.4p4: In a hosted environment, no function specifier(s) shall
6977 // appear in a declaration of main.
6978 // static main is not an error under C99, but we should warn about it.
6979 // We accept _Noreturn main as an extension.
6980 if (FD->getStorageClass() == SC_Static)
6981 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus
6982 ? diag::err_static_main : diag::warn_static_main)
6983 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
6984 if (FD->isInlineSpecified())
6985 Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
6986 << FixItHint::CreateRemoval(DS.getInlineSpecLoc());
6987 if (DS.isNoreturnSpecified()) {
6988 SourceLocation NoreturnLoc = DS.getNoreturnSpecLoc();
6989 SourceRange NoreturnRange(NoreturnLoc,
6990 PP.getLocForEndOfToken(NoreturnLoc));
6991 Diag(NoreturnLoc, diag::ext_noreturn_main);
6992 Diag(NoreturnLoc, diag::note_main_remove_noreturn)
6993 << FixItHint::CreateRemoval(NoreturnRange);
6995 if (FD->isConstexpr()) {
6996 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main)
6997 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc());
6998 FD->setConstexpr(false);
7001 QualType T = FD->getType();
7002 assert(T->isFunctionType() && "function decl is not of function type");
7003 const FunctionType* FT = T->castAs<FunctionType>();
7005 // All the standards say that main() should should return 'int'.
7006 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
7007 // In C and C++, main magically returns 0 if you fall off the end;
7008 // set the flag which tells us that.
7009 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3.
7010 FD->setHasImplicitReturnZero(true);
7012 // In C with GNU extensions we allow main() to have non-integer return
7013 // type, but we should warn about the extension, and we disable the
7014 // implicit-return-zero rule.
7015 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) {
7016 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint);
7018 SourceRange ResultRange = getResultSourceRange(FD);
7019 if (ResultRange.isValid())
7020 Diag(ResultRange.getBegin(), diag::note_main_change_return_type)
7021 << FixItHint::CreateReplacement(ResultRange, "int");
7023 // Otherwise, this is just a flat-out error.
7025 SourceRange ResultRange = getResultSourceRange(FD);
7026 if (ResultRange.isValid())
7027 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint)
7028 << FixItHint::CreateReplacement(ResultRange, "int");
7030 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
7032 FD->setInvalidDecl(true);
7035 // Treat protoless main() as nullary.
7036 if (isa<FunctionNoProtoType>(FT)) return;
7038 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
7039 unsigned nparams = FTP->getNumArgs();
7040 assert(FD->getNumParams() == nparams);
7042 bool HasExtraParameters = (nparams > 3);
7044 // Darwin passes an undocumented fourth argument of type char**. If
7045 // other platforms start sprouting these, the logic below will start
7047 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
7048 HasExtraParameters = false;
7050 if (HasExtraParameters) {
7051 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
7052 FD->setInvalidDecl(true);
7056 // FIXME: a lot of the following diagnostics would be improved
7057 // if we had some location information about types.
7060 Context.getPointerType(Context.getPointerType(Context.CharTy));
7061 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
7063 for (unsigned i = 0; i < nparams; ++i) {
7064 QualType AT = FTP->getArgType(i);
7066 bool mismatch = true;
7068 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
7070 else if (Expected[i] == CharPP) {
7071 // As an extension, the following forms are okay:
7073 // char const * const *
7076 QualifierCollector qs;
7077 const PointerType* PT;
7078 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
7079 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
7080 Context.hasSameType(QualType(qs.strip(PT->getPointeeType()), 0),
7083 mismatch = !qs.empty();
7088 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
7089 // TODO: suggest replacing given type with expected type
7090 FD->setInvalidDecl(true);
7094 if (nparams == 1 && !FD->isInvalidDecl()) {
7095 Diag(FD->getLocation(), diag::warn_main_one_arg);
7098 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
7099 Diag(FD->getLocation(), diag::err_main_template_decl);
7100 FD->setInvalidDecl();
7104 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
7105 // FIXME: Need strict checking. In C89, we need to check for
7106 // any assignment, increment, decrement, function-calls, or
7107 // commas outside of a sizeof. In C99, it's the same list,
7108 // except that the aforementioned are allowed in unevaluated
7109 // expressions. Everything else falls under the
7110 // "may accept other forms of constant expressions" exception.
7111 // (We never end up here for C++, so the constant expression
7112 // rules there don't matter.)
7113 if (Init->isConstantInitializer(Context, false))
7115 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
7116 << Init->getSourceRange();
7121 // Visits an initialization expression to see if OrigDecl is evaluated in
7122 // its own initialization and throws a warning if it does.
7123 class SelfReferenceChecker
7124 : public EvaluatedExprVisitor<SelfReferenceChecker> {
7129 bool isReferenceType;
7132 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
7134 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
7135 S(S), OrigDecl(OrigDecl) {
7137 isRecordType = false;
7138 isReferenceType = false;
7139 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
7140 isPODType = VD->getType().isPODType(S.Context);
7141 isRecordType = VD->getType()->isRecordType();
7142 isReferenceType = VD->getType()->isReferenceType();
7146 // For most expressions, the cast is directly above the DeclRefExpr.
7147 // For conditional operators, the cast can be outside the conditional
7148 // operator if both expressions are DeclRefExpr's.
7149 void HandleValue(Expr *E) {
7150 if (isReferenceType)
7152 E = E->IgnoreParenImpCasts();
7153 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) {
7154 HandleDeclRefExpr(DRE);
7158 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
7159 HandleValue(CO->getTrueExpr());
7160 HandleValue(CO->getFalseExpr());
7164 if (isa<MemberExpr>(E)) {
7165 Expr *Base = E->IgnoreParenImpCasts();
7166 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
7167 // Check for static member variables and don't warn on them.
7168 if (!isa<FieldDecl>(ME->getMemberDecl()))
7170 Base = ME->getBase()->IgnoreParenImpCasts();
7172 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base))
7173 HandleDeclRefExpr(DRE);
7178 // Reference types are handled here since all uses of references are
7179 // bad, not just r-value uses.
7180 void VisitDeclRefExpr(DeclRefExpr *E) {
7181 if (isReferenceType)
7182 HandleDeclRefExpr(E);
7185 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
7186 if (E->getCastKind() == CK_LValueToRValue ||
7187 (isRecordType && E->getCastKind() == CK_NoOp))
7188 HandleValue(E->getSubExpr());
7190 Inherited::VisitImplicitCastExpr(E);
7193 void VisitMemberExpr(MemberExpr *E) {
7194 // Don't warn on arrays since they can be treated as pointers.
7195 if (E->getType()->canDecayToPointerType()) return;
7197 // Warn when a non-static method call is followed by non-static member
7198 // field accesses, which is followed by a DeclRefExpr.
7199 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl());
7200 bool Warn = (MD && !MD->isStatic());
7201 Expr *Base = E->getBase()->IgnoreParenImpCasts();
7202 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
7203 if (!isa<FieldDecl>(ME->getMemberDecl()))
7205 Base = ME->getBase()->IgnoreParenImpCasts();
7208 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) {
7210 HandleDeclRefExpr(DRE);
7214 // The base of a MemberExpr is not a MemberExpr or a DeclRefExpr.
7215 // Visit that expression.
7219 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
7220 if (E->getNumArgs() > 0)
7221 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getArg(0)))
7222 HandleDeclRefExpr(DRE);
7224 Inherited::VisitCXXOperatorCallExpr(E);
7227 void VisitUnaryOperator(UnaryOperator *E) {
7228 // For POD record types, addresses of its own members are well-defined.
7229 if (E->getOpcode() == UO_AddrOf && isRecordType &&
7230 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) {
7232 HandleValue(E->getSubExpr());
7235 Inherited::VisitUnaryOperator(E);
7238 void VisitObjCMessageExpr(ObjCMessageExpr *E) { return; }
7240 void HandleDeclRefExpr(DeclRefExpr *DRE) {
7241 Decl* ReferenceDecl = DRE->getDecl();
7242 if (OrigDecl != ReferenceDecl) return;
7244 if (isReferenceType) {
7245 diag = diag::warn_uninit_self_reference_in_reference_init;
7246 } else if (cast<VarDecl>(OrigDecl)->isStaticLocal()) {
7247 diag = diag::warn_static_self_reference_in_init;
7249 diag = diag::warn_uninit_self_reference_in_init;
7252 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
7254 << DRE->getNameInfo().getName()
7255 << OrigDecl->getLocation()
7256 << DRE->getSourceRange());
7260 /// CheckSelfReference - Warns if OrigDecl is used in expression E.
7261 static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E,
7263 // Parameters arguments are occassionially constructed with itself,
7264 // for instance, in recursive functions. Skip them.
7265 if (isa<ParmVarDecl>(OrigDecl))
7268 E = E->IgnoreParens();
7270 // Skip checking T a = a where T is not a record or reference type.
7271 // Doing so is a way to silence uninitialized warnings.
7272 if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType())
7273 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
7274 if (ICE->getCastKind() == CK_LValueToRValue)
7275 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()))
7276 if (DRE->getDecl() == OrigDecl)
7279 SelfReferenceChecker(S, OrigDecl).Visit(E);
7283 /// AddInitializerToDecl - Adds the initializer Init to the
7284 /// declaration dcl. If DirectInit is true, this is C++ direct
7285 /// initialization rather than copy initialization.
7286 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
7287 bool DirectInit, bool TypeMayContainAuto) {
7288 // If there is no declaration, there was an error parsing it. Just ignore
7290 if (RealDecl == 0 || RealDecl->isInvalidDecl())
7293 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
7294 // With declarators parsed the way they are, the parser cannot
7295 // distinguish between a normal initializer and a pure-specifier.
7296 // Thus this grotesque test.
7298 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
7299 Context.getCanonicalType(IL->getType()) == Context.IntTy)
7300 CheckPureMethod(Method, Init->getSourceRange());
7302 Diag(Method->getLocation(), diag::err_member_function_initialization)
7303 << Method->getDeclName() << Init->getSourceRange();
7304 Method->setInvalidDecl();
7309 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
7311 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
7312 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
7313 RealDecl->setInvalidDecl();
7317 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init);
7319 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
7320 if (TypeMayContainAuto && VDecl->getType()->isUndeducedType()) {
7321 Expr *DeduceInit = Init;
7322 // Initializer could be a C++ direct-initializer. Deduction only works if it
7323 // contains exactly one expression.
7324 if (CXXDirectInit) {
7325 if (CXXDirectInit->getNumExprs() == 0) {
7326 // It isn't possible to write this directly, but it is possible to
7327 // end up in this situation with "auto x(some_pack...);"
7328 Diag(CXXDirectInit->getLocStart(),
7329 diag::err_auto_var_init_no_expression)
7330 << VDecl->getDeclName() << VDecl->getType()
7331 << VDecl->getSourceRange();
7332 RealDecl->setInvalidDecl();
7334 } else if (CXXDirectInit->getNumExprs() > 1) {
7335 Diag(CXXDirectInit->getExpr(1)->getLocStart(),
7336 diag::err_auto_var_init_multiple_expressions)
7337 << VDecl->getDeclName() << VDecl->getType()
7338 << VDecl->getSourceRange();
7339 RealDecl->setInvalidDecl();
7342 DeduceInit = CXXDirectInit->getExpr(0);
7346 // Expressions default to 'id' when we're in a debugger.
7347 bool DefaultedToAuto = false;
7348 if (getLangOpts().DebuggerCastResultToId &&
7349 Init->getType() == Context.UnknownAnyTy) {
7350 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
7351 if (Result.isInvalid()) {
7352 VDecl->setInvalidDecl();
7355 Init = Result.take();
7356 DefaultedToAuto = true;
7359 QualType DeducedType;
7360 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) ==
7362 DiagnoseAutoDeductionFailure(VDecl, DeduceInit);
7363 if (DeducedType.isNull()) {
7364 RealDecl->setInvalidDecl();
7367 VDecl->setType(DeducedType);
7368 assert(VDecl->isLinkageValid());
7370 // In ARC, infer lifetime.
7371 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
7372 VDecl->setInvalidDecl();
7374 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using
7375 // 'id' instead of a specific object type prevents most of our usual checks.
7376 // We only want to warn outside of template instantiations, though:
7377 // inside a template, the 'id' could have come from a parameter.
7378 if (ActiveTemplateInstantiations.empty() && !DefaultedToAuto &&
7379 DeducedType->isObjCIdType()) {
7380 SourceLocation Loc =
7381 VDecl->getTypeSourceInfo()->getTypeLoc().getBeginLoc();
7382 Diag(Loc, diag::warn_auto_var_is_id)
7383 << VDecl->getDeclName() << DeduceInit->getSourceRange();
7386 // If this is a redeclaration, check that the type we just deduced matches
7387 // the previously declared type.
7388 if (VarDecl *Old = VDecl->getPreviousDecl())
7389 MergeVarDeclTypes(VDecl, Old, /*OldWasHidden*/ false);
7391 // Check the deduced type is valid for a variable declaration.
7392 CheckVariableDeclarationType(VDecl);
7393 if (VDecl->isInvalidDecl())
7397 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) {
7398 // C99 6.7.8p5. C++ has no such restriction, but that is a defect.
7399 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
7400 VDecl->setInvalidDecl();
7404 if (!VDecl->getType()->isDependentType()) {
7405 // A definition must end up with a complete type, which means it must be
7406 // complete with the restriction that an array type might be completed by
7407 // the initializer; note that later code assumes this restriction.
7408 QualType BaseDeclType = VDecl->getType();
7409 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
7410 BaseDeclType = Array->getElementType();
7411 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
7412 diag::err_typecheck_decl_incomplete_type)) {
7413 RealDecl->setInvalidDecl();
7417 // The variable can not have an abstract class type.
7418 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
7419 diag::err_abstract_type_in_decl,
7420 AbstractVariableType))
7421 VDecl->setInvalidDecl();
7425 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
7426 Diag(VDecl->getLocation(), diag::err_redefinition)
7427 << VDecl->getDeclName();
7428 Diag(Def->getLocation(), diag::note_previous_definition);
7429 VDecl->setInvalidDecl();
7433 const VarDecl* PrevInit = 0;
7434 if (getLangOpts().CPlusPlus) {
7435 // C++ [class.static.data]p4
7436 // If a static data member is of const integral or const
7437 // enumeration type, its declaration in the class definition can
7438 // specify a constant-initializer which shall be an integral
7439 // constant expression (5.19). In that case, the member can appear
7440 // in integral constant expressions. The member shall still be
7441 // defined in a namespace scope if it is used in the program and the
7442 // namespace scope definition shall not contain an initializer.
7444 // We already performed a redefinition check above, but for static
7445 // data members we also need to check whether there was an in-class
7446 // declaration with an initializer.
7447 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
7448 Diag(VDecl->getLocation(), diag::err_redefinition)
7449 << VDecl->getDeclName();
7450 Diag(PrevInit->getLocation(), diag::note_previous_definition);
7454 if (VDecl->hasLocalStorage())
7455 getCurFunction()->setHasBranchProtectedScope();
7457 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
7458 VDecl->setInvalidDecl();
7463 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
7464 // a kernel function cannot be initialized."
7465 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) {
7466 Diag(VDecl->getLocation(), diag::err_local_cant_init);
7467 VDecl->setInvalidDecl();
7471 // Get the decls type and save a reference for later, since
7472 // CheckInitializerTypes may change it.
7473 QualType DclT = VDecl->getType(), SavT = DclT;
7475 // Expressions default to 'id' when we're in a debugger
7476 // and we are assigning it to a variable of Objective-C pointer type.
7477 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCObjectPointerType() &&
7478 Init->getType() == Context.UnknownAnyTy) {
7479 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
7480 if (Result.isInvalid()) {
7481 VDecl->setInvalidDecl();
7484 Init = Result.take();
7487 // Perform the initialization.
7488 if (!VDecl->isInvalidDecl()) {
7489 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
7490 InitializationKind Kind
7492 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(),
7493 Init->getLocStart(),
7495 : InitializationKind::CreateDirectList(
7496 VDecl->getLocation())
7497 : InitializationKind::CreateCopy(VDecl->getLocation(),
7498 Init->getLocStart());
7500 MultiExprArg Args = Init;
7502 Args = MultiExprArg(CXXDirectInit->getExprs(),
7503 CXXDirectInit->getNumExprs());
7505 InitializationSequence InitSeq(*this, Entity, Kind, Args);
7506 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Args, &DclT);
7507 if (Result.isInvalid()) {
7508 VDecl->setInvalidDecl();
7512 Init = Result.takeAs<Expr>();
7515 // Check for self-references within variable initializers.
7516 // Variables declared within a function/method body (except for references)
7517 // are handled by a dataflow analysis.
7518 if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
7519 VDecl->getType()->isReferenceType()) {
7520 CheckSelfReference(*this, RealDecl, Init, DirectInit);
7523 // If the type changed, it means we had an incomplete type that was
7524 // completed by the initializer. For example:
7525 // int ary[] = { 1, 3, 5 };
7526 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType.
7527 if (!VDecl->isInvalidDecl() && (DclT != SavT))
7528 VDecl->setType(DclT);
7530 if (!VDecl->isInvalidDecl()) {
7531 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
7533 if (VDecl->hasAttr<BlocksAttr>())
7534 checkRetainCycles(VDecl, Init);
7536 // It is safe to assign a weak reference into a strong variable.
7537 // Although this code can still have problems:
7538 // id x = self.weakProp;
7539 // id y = self.weakProp;
7540 // we do not warn to warn spuriously when 'x' and 'y' are on separate
7541 // paths through the function. This should be revisited if
7542 // -Wrepeated-use-of-weak is made flow-sensitive.
7543 if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong) {
7544 DiagnosticsEngine::Level Level =
7545 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak,
7546 Init->getLocStart());
7547 if (Level != DiagnosticsEngine::Ignored)
7548 getCurFunction()->markSafeWeakUse(Init);
7552 // The initialization is usually a full-expression.
7554 // FIXME: If this is a braced initialization of an aggregate, it is not
7555 // an expression, and each individual field initializer is a separate
7556 // full-expression. For instance, in:
7558 // struct Temp { ~Temp(); };
7559 // struct S { S(Temp); };
7560 // struct T { S a, b; } t = { Temp(), Temp() }
7562 // we should destroy the first Temp before constructing the second.
7563 ExprResult Result = ActOnFinishFullExpr(Init, VDecl->getLocation(),
7565 VDecl->isConstexpr());
7566 if (Result.isInvalid()) {
7567 VDecl->setInvalidDecl();
7570 Init = Result.take();
7572 // Attach the initializer to the decl.
7573 VDecl->setInit(Init);
7575 if (VDecl->isLocalVarDecl()) {
7576 // C99 6.7.8p4: All the expressions in an initializer for an object that has
7577 // static storage duration shall be constant expressions or string literals.
7578 // C++ does not have this restriction.
7579 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() &&
7580 VDecl->getStorageClass() == SC_Static)
7581 CheckForConstantInitializer(Init, DclT);
7582 } else if (VDecl->isStaticDataMember() &&
7583 VDecl->getLexicalDeclContext()->isRecord()) {
7584 // This is an in-class initialization for a static data member, e.g.,
7587 // static const int value = 17;
7590 // C++ [class.mem]p4:
7591 // A member-declarator can contain a constant-initializer only
7592 // if it declares a static member (9.4) of const integral or
7593 // const enumeration type, see 9.4.2.
7595 // C++11 [class.static.data]p3:
7596 // If a non-volatile const static data member is of integral or
7597 // enumeration type, its declaration in the class definition can
7598 // specify a brace-or-equal-initializer in which every initalizer-clause
7599 // that is an assignment-expression is a constant expression. A static
7600 // data member of literal type can be declared in the class definition
7601 // with the constexpr specifier; if so, its declaration shall specify a
7602 // brace-or-equal-initializer in which every initializer-clause that is
7603 // an assignment-expression is a constant expression.
7605 // Do nothing on dependent types.
7606 if (DclT->isDependentType()) {
7608 // Allow any 'static constexpr' members, whether or not they are of literal
7609 // type. We separately check that every constexpr variable is of literal
7611 } else if (VDecl->isConstexpr()) {
7613 // Require constness.
7614 } else if (!DclT.isConstQualified()) {
7615 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
7616 << Init->getSourceRange();
7617 VDecl->setInvalidDecl();
7619 // We allow integer constant expressions in all cases.
7620 } else if (DclT->isIntegralOrEnumerationType()) {
7621 // Check whether the expression is a constant expression.
7623 if (getLangOpts().CPlusPlus11 && DclT.isVolatileQualified())
7624 // In C++11, a non-constexpr const static data member with an
7625 // in-class initializer cannot be volatile.
7626 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
7627 else if (Init->isValueDependent())
7628 ; // Nothing to check.
7629 else if (Init->isIntegerConstantExpr(Context, &Loc))
7630 ; // Ok, it's an ICE!
7631 else if (Init->isEvaluatable(Context)) {
7632 // If we can constant fold the initializer through heroics, accept it,
7633 // but report this as a use of an extension for -pedantic.
7634 Diag(Loc, diag::ext_in_class_initializer_non_constant)
7635 << Init->getSourceRange();
7637 // Otherwise, this is some crazy unknown case. Report the issue at the
7638 // location provided by the isIntegerConstantExpr failed check.
7639 Diag(Loc, diag::err_in_class_initializer_non_constant)
7640 << Init->getSourceRange();
7641 VDecl->setInvalidDecl();
7644 // We allow foldable floating-point constants as an extension.
7645 } else if (DclT->isFloatingType()) { // also permits complex, which is ok
7646 // In C++98, this is a GNU extension. In C++11, it is not, but we support
7647 // it anyway and provide a fixit to add the 'constexpr'.
7648 if (getLangOpts().CPlusPlus11) {
7649 Diag(VDecl->getLocation(),
7650 diag::ext_in_class_initializer_float_type_cxx11)
7651 << DclT << Init->getSourceRange();
7652 Diag(VDecl->getLocStart(),
7653 diag::note_in_class_initializer_float_type_cxx11)
7654 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
7656 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
7657 << DclT << Init->getSourceRange();
7659 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) {
7660 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
7661 << Init->getSourceRange();
7662 VDecl->setInvalidDecl();
7666 // Suggest adding 'constexpr' in C++11 for literal types.
7667 } else if (getLangOpts().CPlusPlus11 && DclT->isLiteralType(Context)) {
7668 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
7669 << DclT << Init->getSourceRange()
7670 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
7671 VDecl->setConstexpr(true);
7674 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
7675 << DclT << Init->getSourceRange();
7676 VDecl->setInvalidDecl();
7678 } else if (VDecl->isFileVarDecl()) {
7679 if (VDecl->getStorageClass() == SC_Extern &&
7680 (!getLangOpts().CPlusPlus ||
7681 !(Context.getBaseElementType(VDecl->getType()).isConstQualified() ||
7682 VDecl->isExternC())))
7683 Diag(VDecl->getLocation(), diag::warn_extern_init);
7685 // C99 6.7.8p4. All file scoped initializers need to be constant.
7686 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl())
7687 CheckForConstantInitializer(Init, DclT);
7688 else if (VDecl->getTLSKind() == VarDecl::TLS_Static &&
7689 !VDecl->isInvalidDecl() && !DclT->isDependentType() &&
7690 !Init->isValueDependent() && !VDecl->isConstexpr() &&
7691 !Init->isConstantInitializer(
7692 Context, VDecl->getType()->isReferenceType())) {
7693 // GNU C++98 edits for __thread, [basic.start.init]p4:
7694 // An object of thread storage duration shall not require dynamic
7696 // FIXME: Need strict checking here.
7697 Diag(VDecl->getLocation(), diag::err_thread_dynamic_init);
7698 if (getLangOpts().CPlusPlus11)
7699 Diag(VDecl->getLocation(), diag::note_use_thread_local);
7703 // We will represent direct-initialization similarly to copy-initialization:
7704 // int x(1); -as-> int x = 1;
7705 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
7707 // Clients that want to distinguish between the two forms, can check for
7708 // direct initializer using VarDecl::getInitStyle().
7709 // A major benefit is that clients that don't particularly care about which
7710 // exactly form was it (like the CodeGen) can handle both cases without
7711 // special case code.
7714 // The form of initialization (using parentheses or '=') is generally
7715 // insignificant, but does matter when the entity being initialized has a
7717 if (CXXDirectInit) {
7718 assert(DirectInit && "Call-style initializer must be direct init.");
7719 VDecl->setInitStyle(VarDecl::CallInit);
7720 } else if (DirectInit) {
7721 // This must be list-initialization. No other way is direct-initialization.
7722 VDecl->setInitStyle(VarDecl::ListInit);
7725 CheckCompleteVariableDeclaration(VDecl);
7728 /// ActOnInitializerError - Given that there was an error parsing an
7729 /// initializer for the given declaration, try to return to some form
7731 void Sema::ActOnInitializerError(Decl *D) {
7732 // Our main concern here is re-establishing invariants like "a
7733 // variable's type is either dependent or complete".
7734 if (!D || D->isInvalidDecl()) return;
7736 VarDecl *VD = dyn_cast<VarDecl>(D);
7739 // Auto types are meaningless if we can't make sense of the initializer.
7740 if (ParsingInitForAutoVars.count(D)) {
7741 D->setInvalidDecl();
7745 QualType Ty = VD->getType();
7746 if (Ty->isDependentType()) return;
7748 // Require a complete type.
7749 if (RequireCompleteType(VD->getLocation(),
7750 Context.getBaseElementType(Ty),
7751 diag::err_typecheck_decl_incomplete_type)) {
7752 VD->setInvalidDecl();
7756 // Require an abstract type.
7757 if (RequireNonAbstractType(VD->getLocation(), Ty,
7758 diag::err_abstract_type_in_decl,
7759 AbstractVariableType)) {
7760 VD->setInvalidDecl();
7764 // Don't bother complaining about constructors or destructors,
7768 void Sema::ActOnUninitializedDecl(Decl *RealDecl,
7769 bool TypeMayContainAuto) {
7770 // If there is no declaration, there was an error parsing it. Just ignore it.
7774 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
7775 QualType Type = Var->getType();
7777 // C++11 [dcl.spec.auto]p3
7778 if (TypeMayContainAuto && Type->getContainedAutoType()) {
7779 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
7780 << Var->getDeclName() << Type;
7781 Var->setInvalidDecl();
7785 // C++11 [class.static.data]p3: A static data member can be declared with
7786 // the constexpr specifier; if so, its declaration shall specify
7787 // a brace-or-equal-initializer.
7788 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to
7789 // the definition of a variable [...] or the declaration of a static data
7791 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) {
7792 if (Var->isStaticDataMember())
7793 Diag(Var->getLocation(),
7794 diag::err_constexpr_static_mem_var_requires_init)
7795 << Var->getDeclName();
7797 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl);
7798 Var->setInvalidDecl();
7802 switch (Var->isThisDeclarationADefinition()) {
7803 case VarDecl::Definition:
7804 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
7807 // We have an out-of-line definition of a static data member
7808 // that has an in-class initializer, so we type-check this like
7813 case VarDecl::DeclarationOnly:
7814 // It's only a declaration.
7816 // Block scope. C99 6.7p7: If an identifier for an object is
7817 // declared with no linkage (C99 6.2.2p6), the type for the
7818 // object shall be complete.
7819 if (!Type->isDependentType() && Var->isLocalVarDecl() &&
7820 !Var->getLinkage() && !Var->isInvalidDecl() &&
7821 RequireCompleteType(Var->getLocation(), Type,
7822 diag::err_typecheck_decl_incomplete_type))
7823 Var->setInvalidDecl();
7825 // Make sure that the type is not abstract.
7826 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
7827 RequireNonAbstractType(Var->getLocation(), Type,
7828 diag::err_abstract_type_in_decl,
7829 AbstractVariableType))
7830 Var->setInvalidDecl();
7831 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
7832 Var->getStorageClass() == SC_PrivateExtern) {
7833 Diag(Var->getLocation(), diag::warn_private_extern);
7834 Diag(Var->getLocation(), diag::note_private_extern);
7839 case VarDecl::TentativeDefinition:
7840 // File scope. C99 6.9.2p2: A declaration of an identifier for an
7841 // object that has file scope without an initializer, and without a
7842 // storage-class specifier or with the storage-class specifier "static",
7843 // constitutes a tentative definition. Note: A tentative definition with
7844 // external linkage is valid (C99 6.2.2p5).
7845 if (!Var->isInvalidDecl()) {
7846 if (const IncompleteArrayType *ArrayT
7847 = Context.getAsIncompleteArrayType(Type)) {
7848 if (RequireCompleteType(Var->getLocation(),
7849 ArrayT->getElementType(),
7850 diag::err_illegal_decl_array_incomplete_type))
7851 Var->setInvalidDecl();
7852 } else if (Var->getStorageClass() == SC_Static) {
7853 // C99 6.9.2p3: If the declaration of an identifier for an object is
7854 // a tentative definition and has internal linkage (C99 6.2.2p3), the
7855 // declared type shall not be an incomplete type.
7856 // NOTE: code such as the following
7858 // struct s { int a; };
7859 // is accepted by gcc. Hence here we issue a warning instead of
7860 // an error and we do not invalidate the static declaration.
7861 // NOTE: to avoid multiple warnings, only check the first declaration.
7862 if (Var->getPreviousDecl() == 0)
7863 RequireCompleteType(Var->getLocation(), Type,
7864 diag::ext_typecheck_decl_incomplete_type);
7868 // Record the tentative definition; we're done.
7869 if (!Var->isInvalidDecl())
7870 TentativeDefinitions.push_back(Var);
7874 // Provide a specific diagnostic for uninitialized variable
7875 // definitions with incomplete array type.
7876 if (Type->isIncompleteArrayType()) {
7877 Diag(Var->getLocation(),
7878 diag::err_typecheck_incomplete_array_needs_initializer);
7879 Var->setInvalidDecl();
7883 // Provide a specific diagnostic for uninitialized variable
7884 // definitions with reference type.
7885 if (Type->isReferenceType()) {
7886 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
7887 << Var->getDeclName()
7888 << SourceRange(Var->getLocation(), Var->getLocation());
7889 Var->setInvalidDecl();
7893 // Do not attempt to type-check the default initializer for a
7894 // variable with dependent type.
7895 if (Type->isDependentType())
7898 if (Var->isInvalidDecl())
7901 if (RequireCompleteType(Var->getLocation(),
7902 Context.getBaseElementType(Type),
7903 diag::err_typecheck_decl_incomplete_type)) {
7904 Var->setInvalidDecl();
7908 // The variable can not have an abstract class type.
7909 if (RequireNonAbstractType(Var->getLocation(), Type,
7910 diag::err_abstract_type_in_decl,
7911 AbstractVariableType)) {
7912 Var->setInvalidDecl();
7916 // Check for jumps past the implicit initializer. C++0x
7917 // clarifies that this applies to a "variable with automatic
7918 // storage duration", not a "local variable".
7919 // C++11 [stmt.dcl]p3
7920 // A program that jumps from a point where a variable with automatic
7921 // storage duration is not in scope to a point where it is in scope is
7922 // ill-formed unless the variable has scalar type, class type with a
7923 // trivial default constructor and a trivial destructor, a cv-qualified
7924 // version of one of these types, or an array of one of the preceding
7925 // types and is declared without an initializer.
7926 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) {
7927 if (const RecordType *Record
7928 = Context.getBaseElementType(Type)->getAs<RecordType>()) {
7929 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
7930 // Mark the function for further checking even if the looser rules of
7931 // C++11 do not require such checks, so that we can diagnose
7932 // incompatibilities with C++98.
7933 if (!CXXRecord->isPOD())
7934 getCurFunction()->setHasBranchProtectedScope();
7938 // C++03 [dcl.init]p9:
7939 // If no initializer is specified for an object, and the
7940 // object is of (possibly cv-qualified) non-POD class type (or
7941 // array thereof), the object shall be default-initialized; if
7942 // the object is of const-qualified type, the underlying class
7943 // type shall have a user-declared default
7944 // constructor. Otherwise, if no initializer is specified for
7945 // a non- static object, the object and its subobjects, if
7946 // any, have an indeterminate initial value); if the object
7947 // or any of its subobjects are of const-qualified type, the
7948 // program is ill-formed.
7949 // C++0x [dcl.init]p11:
7950 // If no initializer is specified for an object, the object is
7951 // default-initialized; [...].
7952 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
7953 InitializationKind Kind
7954 = InitializationKind::CreateDefault(Var->getLocation());
7956 InitializationSequence InitSeq(*this, Entity, Kind, None);
7957 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, None);
7958 if (Init.isInvalid())
7959 Var->setInvalidDecl();
7960 else if (Init.get()) {
7961 Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
7962 // This is important for template substitution.
7963 Var->setInitStyle(VarDecl::CallInit);
7966 CheckCompleteVariableDeclaration(Var);
7970 void Sema::ActOnCXXForRangeDecl(Decl *D) {
7971 VarDecl *VD = dyn_cast<VarDecl>(D);
7973 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
7974 D->setInvalidDecl();
7978 VD->setCXXForRangeDecl(true);
7980 // for-range-declaration cannot be given a storage class specifier.
7982 switch (VD->getStorageClass()) {
7991 case SC_PrivateExtern:
8000 case SC_OpenCLWorkGroupLocal:
8001 llvm_unreachable("Unexpected storage class");
8003 if (VD->isConstexpr())
8006 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
8007 << VD->getDeclName() << Error;
8008 D->setInvalidDecl();
8012 void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
8013 if (var->isInvalidDecl()) return;
8015 // In ARC, don't allow jumps past the implicit initialization of a
8016 // local retaining variable.
8017 if (getLangOpts().ObjCAutoRefCount &&
8018 var->hasLocalStorage()) {
8019 switch (var->getType().getObjCLifetime()) {
8020 case Qualifiers::OCL_None:
8021 case Qualifiers::OCL_ExplicitNone:
8022 case Qualifiers::OCL_Autoreleasing:
8025 case Qualifiers::OCL_Weak:
8026 case Qualifiers::OCL_Strong:
8027 getCurFunction()->setHasBranchProtectedScope();
8032 if (var->isThisDeclarationADefinition() &&
8033 var->hasExternalLinkage() &&
8034 getDiagnostics().getDiagnosticLevel(
8035 diag::warn_missing_variable_declarations,
8036 var->getLocation())) {
8037 // Find a previous declaration that's not a definition.
8038 VarDecl *prev = var->getPreviousDecl();
8039 while (prev && prev->isThisDeclarationADefinition())
8040 prev = prev->getPreviousDecl();
8043 Diag(var->getLocation(), diag::warn_missing_variable_declarations) << var;
8046 if (var->getTLSKind() == VarDecl::TLS_Static &&
8047 var->getType().isDestructedType()) {
8048 // GNU C++98 edits for __thread, [basic.start.term]p3:
8049 // The type of an object with thread storage duration shall not
8050 // have a non-trivial destructor.
8051 Diag(var->getLocation(), diag::err_thread_nontrivial_dtor);
8052 if (getLangOpts().CPlusPlus11)
8053 Diag(var->getLocation(), diag::note_use_thread_local);
8056 // All the following checks are C++ only.
8057 if (!getLangOpts().CPlusPlus) return;
8059 QualType type = var->getType();
8060 if (type->isDependentType()) return;
8062 // __block variables might require us to capture a copy-initializer.
8063 if (var->hasAttr<BlocksAttr>()) {
8064 // It's currently invalid to ever have a __block variable with an
8065 // array type; should we diagnose that here?
8067 // Regardless, we don't want to ignore array nesting when
8068 // constructing this copy.
8069 if (type->isStructureOrClassType()) {
8070 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
8071 SourceLocation poi = var->getLocation();
8072 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi);
8074 = PerformMoveOrCopyInitialization(
8075 InitializedEntity::InitializeBlock(poi, type, false),
8076 var, var->getType(), varRef, /*AllowNRVO=*/true);
8077 if (!result.isInvalid()) {
8078 result = MaybeCreateExprWithCleanups(result);
8079 Expr *init = result.takeAs<Expr>();
8080 Context.setBlockVarCopyInits(var, init);
8085 Expr *Init = var->getInit();
8086 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal();
8087 QualType baseType = Context.getBaseElementType(type);
8089 if (!var->getDeclContext()->isDependentContext() &&
8090 Init && !Init->isValueDependent()) {
8091 if (IsGlobal && !var->isConstexpr() &&
8092 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor,
8094 != DiagnosticsEngine::Ignored &&
8095 !Init->isConstantInitializer(Context, baseType->isReferenceType()))
8096 Diag(var->getLocation(), diag::warn_global_constructor)
8097 << Init->getSourceRange();
8099 if (var->isConstexpr()) {
8100 SmallVector<PartialDiagnosticAt, 8> Notes;
8101 if (!var->evaluateValue(Notes) || !var->isInitICE()) {
8102 SourceLocation DiagLoc = var->getLocation();
8103 // If the note doesn't add any useful information other than a source
8104 // location, fold it into the primary diagnostic.
8105 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
8106 diag::note_invalid_subexpr_in_const_expr) {
8107 DiagLoc = Notes[0].first;
8110 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init)
8111 << var << Init->getSourceRange();
8112 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
8113 Diag(Notes[I].first, Notes[I].second);
8115 } else if (var->isUsableInConstantExpressions(Context)) {
8116 // Check whether the initializer of a const variable of integral or
8117 // enumeration type is an ICE now, since we can't tell whether it was
8118 // initialized by a constant expression if we check later.
8119 var->checkInitIsICE();
8123 // Require the destructor.
8124 if (const RecordType *recordType = baseType->getAs<RecordType>())
8125 FinalizeVarWithDestructor(var, recordType);
8128 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
8129 /// any semantic actions necessary after any initializer has been attached.
8131 Sema::FinalizeDeclaration(Decl *ThisDecl) {
8132 // Note that we are no longer parsing the initializer for this declaration.
8133 ParsingInitForAutoVars.erase(ThisDecl);
8135 VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl);
8139 const DeclContext *DC = VD->getDeclContext();
8140 // If there's a #pragma GCC visibility in scope, and this isn't a class
8141 // member, set the visibility of this variable.
8142 if (!DC->isRecord() && VD->hasExternalLinkage())
8143 AddPushedVisibilityAttribute(VD);
8145 if (VD->isFileVarDecl())
8146 MarkUnusedFileScopedDecl(VD);
8148 // Now we have parsed the initializer and can update the table of magic
8150 if (!VD->hasAttr<TypeTagForDatatypeAttr>() ||
8151 !VD->getType()->isIntegralOrEnumerationType())
8154 for (specific_attr_iterator<TypeTagForDatatypeAttr>
8155 I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(),
8156 E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>();
8158 const Expr *MagicValueExpr = VD->getInit();
8159 if (!MagicValueExpr) {
8162 llvm::APSInt MagicValueInt;
8163 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) {
8164 Diag(I->getRange().getBegin(),
8165 diag::err_type_tag_for_datatype_not_ice)
8166 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
8169 if (MagicValueInt.getActiveBits() > 64) {
8170 Diag(I->getRange().getBegin(),
8171 diag::err_type_tag_for_datatype_too_large)
8172 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
8175 uint64_t MagicValue = MagicValueInt.getZExtValue();
8176 RegisterTypeTagForDatatype(I->getArgumentKind(),
8178 I->getMatchingCType(),
8179 I->getLayoutCompatible(),
8180 I->getMustBeNull());
8184 Sema::DeclGroupPtrTy
8185 Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
8186 Decl **Group, unsigned NumDecls) {
8187 SmallVector<Decl*, 8> Decls;
8189 if (DS.isTypeSpecOwned())
8190 Decls.push_back(DS.getRepAsDecl());
8192 for (unsigned i = 0; i != NumDecls; ++i)
8193 if (Decl *D = Group[i])
8196 if (DeclSpec::isDeclRep(DS.getTypeSpecType()))
8197 if (const TagDecl *Tag = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl()))
8198 getASTContext().addUnnamedTag(Tag);
8200 return BuildDeclaratorGroup(Decls.data(), Decls.size(),
8201 DS.containsPlaceholderType());
8204 /// BuildDeclaratorGroup - convert a list of declarations into a declaration
8205 /// group, performing any necessary semantic checking.
8206 Sema::DeclGroupPtrTy
8207 Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls,
8208 bool TypeMayContainAuto) {
8209 // C++0x [dcl.spec.auto]p7:
8210 // If the type deduced for the template parameter U is not the same in each
8211 // deduction, the program is ill-formed.
8212 // FIXME: When initializer-list support is added, a distinction is needed
8213 // between the deduced type U and the deduced type which 'auto' stands for.
8214 // auto a = 0, b = { 1, 2, 3 };
8215 // is legal because the deduced type U is 'int' in both cases.
8216 if (TypeMayContainAuto && NumDecls > 1) {
8218 CanQualType DeducedCanon;
8219 VarDecl *DeducedDecl = 0;
8220 for (unsigned i = 0; i != NumDecls; ++i) {
8221 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
8222 AutoType *AT = D->getType()->getContainedAutoType();
8223 // Don't reissue diagnostics when instantiating a template.
8224 if (AT && D->isInvalidDecl())
8226 QualType U = AT ? AT->getDeducedType() : QualType();
8228 CanQualType UCanon = Context.getCanonicalType(U);
8229 if (Deduced.isNull()) {
8231 DeducedCanon = UCanon;
8233 } else if (DeducedCanon != UCanon) {
8234 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
8235 diag::err_auto_different_deductions)
8236 << (AT->isDecltypeAuto() ? 1 : 0)
8237 << Deduced << DeducedDecl->getDeclName()
8238 << U << D->getDeclName()
8239 << DeducedDecl->getInit()->getSourceRange()
8240 << D->getInit()->getSourceRange();
8241 D->setInvalidDecl();
8249 ActOnDocumentableDecls(Group, NumDecls);
8251 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls));
8254 void Sema::ActOnDocumentableDecl(Decl *D) {
8255 ActOnDocumentableDecls(&D, 1);
8258 void Sema::ActOnDocumentableDecls(Decl **Group, unsigned NumDecls) {
8259 // Don't parse the comment if Doxygen diagnostics are ignored.
8260 if (NumDecls == 0 || !Group[0])
8263 if (Diags.getDiagnosticLevel(diag::warn_doc_param_not_found,
8264 Group[0]->getLocation())
8265 == DiagnosticsEngine::Ignored)
8268 if (NumDecls >= 2) {
8269 // This is a decl group. Normally it will contain only declarations
8270 // procuded from declarator list. But in case we have any definitions or
8271 // additional declaration references:
8272 // 'typedef struct S {} S;'
8273 // 'typedef struct S *S;'
8275 // FinalizeDeclaratorGroup adds these as separate declarations.
8276 Decl *MaybeTagDecl = Group[0];
8277 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) {
8283 // See if there are any new comments that are not attached to a decl.
8284 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments();
8285 if (!Comments.empty() &&
8286 !Comments.back()->isAttached()) {
8287 // There is at least one comment that not attached to a decl.
8288 // Maybe it should be attached to one of these decls?
8290 // Note that this way we pick up not only comments that precede the
8291 // declaration, but also comments that *follow* the declaration -- thanks to
8292 // the lookahead in the lexer: we've consumed the semicolon and looked
8293 // ahead through comments.
8294 for (unsigned i = 0; i != NumDecls; ++i)
8295 Context.getCommentForDecl(Group[i], &PP);
8299 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
8300 /// to introduce parameters into function prototype scope.
8301 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
8302 const DeclSpec &DS = D.getDeclSpec();
8304 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
8305 // C++03 [dcl.stc]p2 also permits 'auto'.
8306 VarDecl::StorageClass StorageClass = SC_None;
8307 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
8308 StorageClass = SC_Register;
8309 } else if (getLangOpts().CPlusPlus &&
8310 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
8311 StorageClass = SC_Auto;
8312 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
8313 Diag(DS.getStorageClassSpecLoc(),
8314 diag::err_invalid_storage_class_in_func_decl);
8315 D.getMutableDeclSpec().ClearStorageClassSpecs();
8318 if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
8319 Diag(DS.getThreadStorageClassSpecLoc(), diag::err_invalid_thread)
8320 << DeclSpec::getSpecifierName(TSCS);
8321 if (DS.isConstexprSpecified())
8322 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr)
8325 DiagnoseFunctionSpecifiers(DS);
8327 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8328 QualType parmDeclType = TInfo->getType();
8330 if (getLangOpts().CPlusPlus) {
8331 // Check that there are no default arguments inside the type of this
8333 CheckExtraCXXDefaultArguments(D);
8335 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
8336 if (D.getCXXScopeSpec().isSet()) {
8337 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
8338 << D.getCXXScopeSpec().getRange();
8339 D.getCXXScopeSpec().clear();
8343 // Ensure we have a valid name
8344 IdentifierInfo *II = 0;
8346 II = D.getIdentifier();
8348 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
8349 << GetNameForDeclarator(D).getName().getAsString();
8350 D.setInvalidType(true);
8354 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
8356 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
8359 if (R.isSingleResult()) {
8360 NamedDecl *PrevDecl = R.getFoundDecl();
8361 if (PrevDecl->isTemplateParameter()) {
8362 // Maybe we will complain about the shadowed template parameter.
8363 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
8364 // Just pretend that we didn't see the previous declaration.
8366 } else if (S->isDeclScope(PrevDecl)) {
8367 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
8368 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
8370 // Recover by removing the name
8372 D.SetIdentifier(0, D.getIdentifierLoc());
8373 D.setInvalidType(true);
8378 // Temporarily put parameter variables in the translation unit, not
8379 // the enclosing context. This prevents them from accidentally
8380 // looking like class members in C++.
8381 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
8383 D.getIdentifierLoc(), II,
8384 parmDeclType, TInfo,
8387 if (D.isInvalidType())
8388 New->setInvalidDecl();
8390 assert(S->isFunctionPrototypeScope());
8391 assert(S->getFunctionPrototypeDepth() >= 1);
8392 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
8393 S->getNextFunctionPrototypeIndex());
8395 // Add the parameter declaration into this scope.
8398 IdResolver.AddDecl(New);
8400 ProcessDeclAttributes(S, New, D);
8402 if (D.getDeclSpec().isModulePrivateSpecified())
8403 Diag(New->getLocation(), diag::err_module_private_local)
8404 << 1 << New->getDeclName()
8405 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
8406 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
8408 if (New->hasAttr<BlocksAttr>()) {
8409 Diag(New->getLocation(), diag::err_block_on_nonlocal);
8414 /// \brief Synthesizes a variable for a parameter arising from a
8416 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
8419 /* FIXME: setting StartLoc == Loc.
8420 Would it be worth to modify callers so as to provide proper source
8421 location for the unnamed parameters, embedding the parameter's type? */
8422 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0,
8423 T, Context.getTrivialTypeSourceInfo(T, Loc),
8425 Param->setImplicit();
8429 void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
8430 ParmVarDecl * const *ParamEnd) {
8431 // Don't diagnose unused-parameter errors in template instantiations; we
8432 // will already have done so in the template itself.
8433 if (!ActiveTemplateInstantiations.empty())
8436 for (; Param != ParamEnd; ++Param) {
8437 if (!(*Param)->isReferenced() && (*Param)->getDeclName() &&
8438 !(*Param)->hasAttr<UnusedAttr>()) {
8439 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
8440 << (*Param)->getDeclName();
8445 void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param,
8446 ParmVarDecl * const *ParamEnd,
8449 if (LangOpts.NumLargeByValueCopy == 0) // No check.
8452 // Warn if the return value is pass-by-value and larger than the specified
8454 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) {
8455 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
8456 if (Size > LangOpts.NumLargeByValueCopy)
8457 Diag(D->getLocation(), diag::warn_return_value_size)
8458 << D->getDeclName() << Size;
8461 // Warn if any parameter is pass-by-value and larger than the specified
8463 for (; Param != ParamEnd; ++Param) {
8464 QualType T = (*Param)->getType();
8465 if (T->isDependentType() || !T.isPODType(Context))
8467 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
8468 if (Size > LangOpts.NumLargeByValueCopy)
8469 Diag((*Param)->getLocation(), diag::warn_parameter_size)
8470 << (*Param)->getDeclName() << Size;
8474 ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
8475 SourceLocation NameLoc, IdentifierInfo *Name,
8476 QualType T, TypeSourceInfo *TSInfo,
8477 VarDecl::StorageClass StorageClass) {
8478 // In ARC, infer a lifetime qualifier for appropriate parameter types.
8479 if (getLangOpts().ObjCAutoRefCount &&
8480 T.getObjCLifetime() == Qualifiers::OCL_None &&
8481 T->isObjCLifetimeType()) {
8483 Qualifiers::ObjCLifetime lifetime;
8485 // Special cases for arrays:
8486 // - if it's const, use __unsafe_unretained
8487 // - otherwise, it's an error
8488 if (T->isArrayType()) {
8489 if (!T.isConstQualified()) {
8490 DelayedDiagnostics.add(
8491 sema::DelayedDiagnostic::makeForbiddenType(
8492 NameLoc, diag::err_arc_array_param_no_ownership, T, false));
8494 lifetime = Qualifiers::OCL_ExplicitNone;
8496 lifetime = T->getObjCARCImplicitLifetime();
8498 T = Context.getLifetimeQualifiedType(T, lifetime);
8501 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
8502 Context.getAdjustedParameterType(T),
8506 // Parameters can not be abstract class types.
8507 // For record types, this is done by the AbstractClassUsageDiagnoser once
8508 // the class has been completely parsed.
8509 if (!CurContext->isRecord() &&
8510 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
8512 New->setInvalidDecl();
8514 // Parameter declarators cannot be interface types. All ObjC objects are
8515 // passed by reference.
8516 if (T->isObjCObjectType()) {
8517 SourceLocation TypeEndLoc = TSInfo->getTypeLoc().getLocEnd();
8519 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
8520 << FixItHint::CreateInsertion(TypeEndLoc, "*");
8521 T = Context.getObjCObjectPointerType(T);
8525 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
8526 // duration shall not be qualified by an address-space qualifier."
8527 // Since all parameters have automatic store duration, they can not have
8528 // an address space.
8529 if (T.getAddressSpace() != 0) {
8530 Diag(NameLoc, diag::err_arg_with_address_space);
8531 New->setInvalidDecl();
8537 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
8538 SourceLocation LocAfterDecls) {
8539 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
8541 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
8542 // for a K&R function.
8543 if (!FTI.hasPrototype) {
8544 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
8546 if (FTI.ArgInfo[i].Param == 0) {
8547 SmallString<256> Code;
8548 llvm::raw_svector_ostream(Code) << " int "
8549 << FTI.ArgInfo[i].Ident->getName()
8551 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
8552 << FTI.ArgInfo[i].Ident
8553 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
8555 // Implicitly declare the argument as type 'int' for lack of a better
8557 AttributeFactory attrs;
8559 const char* PrevSpec; // unused
8560 unsigned DiagID; // unused
8561 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
8563 // Use the identifier location for the type source range.
8564 DS.SetRangeStart(FTI.ArgInfo[i].IdentLoc);
8565 DS.SetRangeEnd(FTI.ArgInfo[i].IdentLoc);
8566 Declarator ParamD(DS, Declarator::KNRTypeListContext);
8567 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
8568 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
8574 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) {
8575 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
8576 assert(D.isFunctionDeclarator() && "Not a function declarator!");
8577 Scope *ParentScope = FnBodyScope->getParent();
8579 D.setFunctionDefinitionKind(FDK_Definition);
8580 Decl *DP = HandleDeclarator(ParentScope, D, MultiTemplateParamsArg());
8581 return ActOnStartOfFunctionDef(FnBodyScope, DP);
8584 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD,
8585 const FunctionDecl*& PossibleZeroParamPrototype) {
8586 // Don't warn about invalid declarations.
8587 if (FD->isInvalidDecl())
8590 // Or declarations that aren't global.
8591 if (!FD->isGlobal())
8594 // Don't warn about C++ member functions.
8595 if (isa<CXXMethodDecl>(FD))
8598 // Don't warn about 'main'.
8602 // Don't warn about inline functions.
8603 if (FD->isInlined())
8606 // Don't warn about function templates.
8607 if (FD->getDescribedFunctionTemplate())
8610 // Don't warn about function template specializations.
8611 if (FD->isFunctionTemplateSpecialization())
8614 // Don't warn for OpenCL kernels.
8615 if (FD->hasAttr<OpenCLKernelAttr>())
8618 bool MissingPrototype = true;
8619 for (const FunctionDecl *Prev = FD->getPreviousDecl();
8620 Prev; Prev = Prev->getPreviousDecl()) {
8621 // Ignore any declarations that occur in function or method
8622 // scope, because they aren't visible from the header.
8623 if (Prev->getDeclContext()->isFunctionOrMethod())
8626 MissingPrototype = !Prev->getType()->isFunctionProtoType();
8627 if (FD->getNumParams() == 0)
8628 PossibleZeroParamPrototype = Prev;
8632 return MissingPrototype;
8635 void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) {
8636 // Don't complain if we're in GNU89 mode and the previous definition
8637 // was an extern inline function.
8638 const FunctionDecl *Definition;
8639 if (FD->isDefined(Definition) &&
8640 !canRedefineFunction(Definition, getLangOpts())) {
8641 if (getLangOpts().GNUMode && Definition->isInlineSpecified() &&
8642 Definition->getStorageClass() == SC_Extern)
8643 Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
8644 << FD->getDeclName() << getLangOpts().CPlusPlus;
8646 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
8647 Diag(Definition->getLocation(), diag::note_previous_definition);
8648 FD->setInvalidDecl();
8652 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
8653 // Clear the last template instantiation error context.
8654 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
8658 FunctionDecl *FD = 0;
8660 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
8661 FD = FunTmpl->getTemplatedDecl();
8663 FD = cast<FunctionDecl>(D);
8665 // Enter a new function scope
8666 PushFunctionScope();
8668 // See if this is a redefinition.
8669 if (!FD->isLateTemplateParsed())
8670 CheckForFunctionRedefinition(FD);
8672 // Builtin functions cannot be defined.
8673 if (unsigned BuiltinID = FD->getBuiltinID()) {
8674 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
8675 !Context.BuiltinInfo.isPredefinedRuntimeFunction(BuiltinID)) {
8676 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
8677 FD->setInvalidDecl();
8681 // The return type of a function definition must be complete
8682 // (C99 6.9.1p3, C++ [dcl.fct]p6).
8683 QualType ResultType = FD->getResultType();
8684 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
8685 !FD->isInvalidDecl() &&
8686 RequireCompleteType(FD->getLocation(), ResultType,
8687 diag::err_func_def_incomplete_result))
8688 FD->setInvalidDecl();
8690 // GNU warning -Wmissing-prototypes:
8691 // Warn if a global function is defined without a previous
8692 // prototype declaration. This warning is issued even if the
8693 // definition itself provides a prototype. The aim is to detect
8694 // global functions that fail to be declared in header files.
8695 const FunctionDecl *PossibleZeroParamPrototype = 0;
8696 if (ShouldWarnAboutMissingPrototype(FD, PossibleZeroParamPrototype)) {
8697 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
8699 if (PossibleZeroParamPrototype) {
8700 // We found a declaration that is not a prototype,
8701 // but that could be a zero-parameter prototype
8702 TypeSourceInfo* TI = PossibleZeroParamPrototype->getTypeSourceInfo();
8703 TypeLoc TL = TI->getTypeLoc();
8704 if (FunctionNoProtoTypeLoc FTL = TL.getAs<FunctionNoProtoTypeLoc>())
8705 Diag(PossibleZeroParamPrototype->getLocation(),
8706 diag::note_declaration_not_a_prototype)
8707 << PossibleZeroParamPrototype
8708 << FixItHint::CreateInsertion(FTL.getRParenLoc(), "void");
8713 PushDeclContext(FnBodyScope, FD);
8715 // Check the validity of our function parameters
8716 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(),
8717 /*CheckParameterNames=*/true);
8719 // Introduce our parameters into the function scope
8720 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
8721 ParmVarDecl *Param = FD->getParamDecl(p);
8722 Param->setOwningFunction(FD);
8724 // If this has an identifier, add it to the scope stack.
8725 if (Param->getIdentifier() && FnBodyScope) {
8726 CheckShadow(FnBodyScope, Param);
8728 PushOnScopeChains(Param, FnBodyScope);
8732 // If we had any tags defined in the function prototype,
8733 // introduce them into the function scope.
8735 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(),
8736 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) {
8739 // Some of these decls (like enums) may have been pinned to the translation unit
8740 // for lack of a real context earlier. If so, remove from the translation unit
8741 // and reattach to the current context.
8742 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) {
8743 // Is the decl actually in the context?
8744 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(),
8745 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) {
8747 Context.getTranslationUnitDecl()->removeDecl(D);
8751 // Either way, reassign the lexical decl context to our FunctionDecl.
8752 D->setLexicalDeclContext(CurContext);
8755 // If the decl has a non-null name, make accessible in the current scope.
8756 if (!D->getName().empty())
8757 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false);
8759 // Similarly, dive into enums and fish their constants out, making them
8760 // accessible in this scope.
8761 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
8762 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(),
8763 EE = ED->enumerator_end(); EI != EE; ++EI)
8764 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false);
8769 // Ensure that the function's exception specification is instantiated.
8770 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>())
8771 ResolveExceptionSpec(D->getLocation(), FPT);
8773 // Checking attributes of current function definition
8774 // dllimport attribute.
8775 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
8776 if (DA && (!FD->getAttr<DLLExportAttr>())) {
8777 // dllimport attribute cannot be directly applied to definition.
8778 // Microsoft accepts dllimport for functions defined within class scope.
8779 if (!DA->isInherited() &&
8780 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) {
8781 Diag(FD->getLocation(),
8782 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
8784 FD->setInvalidDecl();
8788 // Visual C++ appears to not think this is an issue, so only issue
8789 // a warning when Microsoft extensions are disabled.
8790 if (!LangOpts.MicrosoftExt) {
8791 // If a symbol previously declared dllimport is later defined, the
8792 // attribute is ignored in subsequent references, and a warning is
8794 Diag(FD->getLocation(),
8795 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
8796 << FD->getName() << "dllimport";
8799 // We want to attach documentation to original Decl (which might be
8800 // a function template).
8801 ActOnDocumentableDecl(D);
8805 /// \brief Given the set of return statements within a function body,
8806 /// compute the variables that are subject to the named return value
8809 /// Each of the variables that is subject to the named return value
8810 /// optimization will be marked as NRVO variables in the AST, and any
8811 /// return statement that has a marked NRVO variable as its NRVO candidate can
8812 /// use the named return value optimization.
8814 /// This function applies a very simplistic algorithm for NRVO: if every return
8815 /// statement in the function has the same NRVO candidate, that candidate is
8816 /// the NRVO variable.
8818 /// FIXME: Employ a smarter algorithm that accounts for multiple return
8819 /// statements and the lifetimes of the NRVO candidates. We should be able to
8820 /// find a maximal set of NRVO variables.
8821 void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
8822 ReturnStmt **Returns = Scope->Returns.data();
8824 const VarDecl *NRVOCandidate = 0;
8825 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
8826 if (!Returns[I]->getNRVOCandidate())
8830 NRVOCandidate = Returns[I]->getNRVOCandidate();
8831 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
8836 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
8839 bool Sema::canSkipFunctionBody(Decl *D) {
8840 if (!Consumer.shouldSkipFunctionBody(D))
8843 if (isa<ObjCMethodDecl>(D))
8846 FunctionDecl *FD = 0;
8847 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
8848 FD = FTD->getTemplatedDecl();
8850 FD = cast<FunctionDecl>(D);
8852 // We cannot skip the body of a function (or function template) which is
8853 // constexpr, since we may need to evaluate its body in order to parse the
8854 // rest of the file.
8855 return !FD->isConstexpr();
8858 Decl *Sema::ActOnSkippedFunctionBody(Decl *Decl) {
8859 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Decl))
8860 FD->setHasSkippedBody();
8861 else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(Decl))
8862 MD->setHasSkippedBody();
8863 return ActOnFinishFunctionBody(Decl, 0);
8866 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
8867 return ActOnFinishFunctionBody(D, BodyArg, false);
8870 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
8871 bool IsInstantiation) {
8872 FunctionDecl *FD = 0;
8873 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
8875 FD = FunTmpl->getTemplatedDecl();
8877 FD = dyn_cast_or_null<FunctionDecl>(dcl);
8879 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
8880 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0;
8885 if (getLangOpts().CPlusPlus1y && !FD->isInvalidDecl() &&
8886 !FD->isDependentContext()) {
8887 if (FD->getResultType()->isUndeducedType()) {
8888 // If the function has a deduced result type but contains no 'return'
8889 // statements, the result type as written must be exactly 'auto', and
8890 // the deduced result type is 'void'.
8891 if (!FD->getResultType()->getAs<AutoType>()) {
8892 Diag(dcl->getLocation(), diag::err_auto_fn_no_return_but_not_auto)
8893 << FD->getResultType();
8894 FD->setInvalidDecl();
8896 Context.adjustDeducedFunctionResultType(FD, Context.VoidTy);
8900 // The only way to be included in UndefinedButUsed is if there is an
8901 // ODR use before the definition. Avoid the expensive map lookup if this
8902 // is the first declaration.
8903 if (FD->getPreviousDecl() != 0 && FD->getPreviousDecl()->isUsed()) {
8904 if (FD->getLinkage() != ExternalLinkage)
8905 UndefinedButUsed.erase(FD);
8906 else if (FD->isInlined() &&
8907 (LangOpts.CPlusPlus || !LangOpts.GNUInline) &&
8908 (!FD->getPreviousDecl()->hasAttr<GNUInlineAttr>()))
8909 UndefinedButUsed.erase(FD);
8912 // If the function implicitly returns zero (like 'main') or is naked,
8913 // don't complain about missing return statements.
8914 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>())
8915 WP.disableCheckFallThrough();
8917 // MSVC permits the use of pure specifier (=0) on function definition,
8918 // defined at class scope, warn about this non standard construct.
8919 if (getLangOpts().MicrosoftExt && FD->isPure())
8920 Diag(FD->getLocation(), diag::warn_pure_function_definition);
8922 if (!FD->isInvalidDecl()) {
8923 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
8924 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(),
8925 FD->getResultType(), FD);
8927 // If this is a constructor, we need a vtable.
8928 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
8929 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
8931 // Try to apply the named return value optimization. We have to check
8932 // if we can do this here because lambdas keep return statements around
8933 // to deduce an implicit return type.
8934 if (getLangOpts().CPlusPlus && FD->getResultType()->isRecordType() &&
8935 !FD->isDependentContext())
8936 computeNRVO(Body, getCurFunction());
8939 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) &&
8940 "Function parsing confused");
8941 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
8942 assert(MD == getCurMethodDecl() && "Method parsing confused");
8944 if (!MD->isInvalidDecl()) {
8945 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
8946 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(),
8947 MD->getResultType(), MD);
8950 computeNRVO(Body, getCurFunction());
8952 if (getCurFunction()->ObjCShouldCallSuper) {
8953 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call)
8954 << MD->getSelector().getAsString();
8955 getCurFunction()->ObjCShouldCallSuper = false;
8961 assert(!getCurFunction()->ObjCShouldCallSuper &&
8962 "This should only be set for ObjC methods, which should have been "
8963 "handled in the block above.");
8965 // Verify and clean out per-function state.
8967 // C++ constructors that have function-try-blocks can't have return
8968 // statements in the handlers of that block. (C++ [except.handle]p14)
8970 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
8971 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
8973 // Verify that gotos and switch cases don't jump into scopes illegally.
8974 if (getCurFunction()->NeedsScopeChecking() &&
8975 !dcl->isInvalidDecl() &&
8976 !hasAnyUnrecoverableErrorsInThisFunction() &&
8977 !PP.isCodeCompletionEnabled())
8978 DiagnoseInvalidJumps(Body);
8980 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
8981 if (!Destructor->getParent()->isDependentType())
8982 CheckDestructor(Destructor);
8984 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
8985 Destructor->getParent());
8988 // If any errors have occurred, clear out any temporaries that may have
8989 // been leftover. This ensures that these temporaries won't be picked up for
8990 // deletion in some later function.
8991 if (PP.getDiagnostics().hasErrorOccurred() ||
8992 PP.getDiagnostics().getSuppressAllDiagnostics()) {
8993 DiscardCleanupsInEvaluationContext();
8995 if (!PP.getDiagnostics().hasUncompilableErrorOccurred() &&
8996 !isa<FunctionTemplateDecl>(dcl)) {
8997 // Since the body is valid, issue any analysis-based warnings that are
9002 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
9003 (!CheckConstexprFunctionDecl(FD) ||
9004 !CheckConstexprFunctionBody(FD, Body)))
9005 FD->setInvalidDecl();
9007 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function");
9008 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
9009 assert(MaybeODRUseExprs.empty() &&
9010 "Leftover expressions for odr-use checking");
9013 if (!IsInstantiation)
9016 PopFunctionScopeInfo(ActivePolicy, dcl);
9018 // If any errors have occurred, clear out any temporaries that may have
9019 // been leftover. This ensures that these temporaries won't be picked up for
9020 // deletion in some later function.
9021 if (getDiagnostics().hasErrorOccurred()) {
9022 DiscardCleanupsInEvaluationContext();
9029 /// When we finish delayed parsing of an attribute, we must attach it to the
9031 void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
9032 ParsedAttributes &Attrs) {
9033 // Always attach attributes to the underlying decl.
9034 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
9035 D = TD->getTemplatedDecl();
9036 ProcessDeclAttributeList(S, D, Attrs.getList());
9038 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D))
9039 if (Method->isStatic())
9040 checkThisInStaticMemberFunctionAttributes(Method);
9044 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function
9045 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
9046 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
9047 IdentifierInfo &II, Scope *S) {
9048 // Before we produce a declaration for an implicitly defined
9049 // function, see whether there was a locally-scoped declaration of
9050 // this name as a function or variable. If so, use that
9051 // (non-visible) declaration, and complain about it.
9052 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
9053 = findLocallyScopedExternCDecl(&II);
9054 if (Pos != LocallyScopedExternCDecls.end()) {
9055 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
9056 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
9060 // Extension in C99. Legal in C90, but warn about it.
9062 if (II.getName().startswith("__builtin_"))
9063 diag_id = diag::warn_builtin_unknown;
9064 else if (getLangOpts().C99)
9065 diag_id = diag::ext_implicit_function_decl;
9067 diag_id = diag::warn_implicit_function_decl;
9068 Diag(Loc, diag_id) << &II;
9070 // Because typo correction is expensive, only do it if the implicit
9071 // function declaration is going to be treated as an error.
9072 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) {
9073 TypoCorrection Corrected;
9074 DeclFilterCCC<FunctionDecl> Validator;
9075 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc),
9076 LookupOrdinaryName, S, 0, Validator))) {
9077 std::string CorrectedStr = Corrected.getAsString(getLangOpts());
9078 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts());
9079 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>();
9081 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr
9082 << FixItHint::CreateReplacement(Loc, CorrectedStr);
9084 if (Func->getLocation().isValid()
9085 && !II.getName().startswith("__builtin_"))
9086 Diag(Func->getLocation(), diag::note_previous_decl)
9087 << CorrectedQuotedStr;
9091 // Set a Declarator for the implicit definition: int foo();
9093 AttributeFactory attrFactory;
9094 DeclSpec DS(attrFactory);
9096 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
9097 (void)Error; // Silence warning.
9098 assert(!Error && "Error setting up implicit decl!");
9099 SourceLocation NoLoc;
9100 Declarator D(DS, Declarator::BlockContext);
9101 D.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/false,
9102 /*IsAmbiguous=*/false,
9103 /*RParenLoc=*/NoLoc,
9106 /*EllipsisLoc=*/NoLoc,
9107 /*RParenLoc=*/NoLoc,
9109 /*RefQualifierIsLvalueRef=*/true,
9110 /*RefQualifierLoc=*/NoLoc,
9111 /*ConstQualifierLoc=*/NoLoc,
9112 /*VolatileQualifierLoc=*/NoLoc,
9113 /*MutableLoc=*/NoLoc,
9117 /*ExceptionRanges=*/0,
9118 /*NumExceptions=*/0,
9123 D.SetIdentifier(&II, Loc);
9125 // Insert this function into translation-unit scope.
9127 DeclContext *PrevDC = CurContext;
9128 CurContext = Context.getTranslationUnitDecl();
9130 FunctionDecl *FD = cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
9133 CurContext = PrevDC;
9135 AddKnownFunctionAttributes(FD);
9140 /// \brief Adds any function attributes that we know a priori based on
9141 /// the declaration of this function.
9143 /// These attributes can apply both to implicitly-declared builtins
9144 /// (like __builtin___printf_chk) or to library-declared functions
9145 /// like NSLog or printf.
9147 /// We need to check for duplicate attributes both here and where user-written
9148 /// attributes are applied to declarations.
9149 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
9150 if (FD->isInvalidDecl())
9153 // If this is a built-in function, map its builtin attributes to
9154 // actual attributes.
9155 if (unsigned BuiltinID = FD->getBuiltinID()) {
9156 // Handle printf-formatting attributes.
9159 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
9160 if (!FD->getAttr<FormatAttr>()) {
9161 const char *fmt = "printf";
9162 unsigned int NumParams = FD->getNumParams();
9163 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf)
9164 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType())
9166 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
9168 HasVAListArg ? 0 : FormatIdx+2));
9171 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
9173 if (!FD->getAttr<FormatAttr>())
9174 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
9175 "scanf", FormatIdx+1,
9176 HasVAListArg ? 0 : FormatIdx+2));
9179 // Mark const if we don't care about errno and that is the only
9180 // thing preventing the function from being const. This allows
9181 // IRgen to use LLVM intrinsics for such functions.
9182 if (!getLangOpts().MathErrno &&
9183 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
9184 if (!FD->getAttr<ConstAttr>())
9185 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
9188 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
9189 !FD->getAttr<ReturnsTwiceAttr>())
9190 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context));
9191 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>())
9192 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
9193 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>())
9194 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
9197 IdentifierInfo *Name = FD->getIdentifier();
9200 if ((!getLangOpts().CPlusPlus &&
9201 FD->getDeclContext()->isTranslationUnit()) ||
9202 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
9203 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
9204 LinkageSpecDecl::lang_c)) {
9205 // Okay: this could be a libc/libm/Objective-C function we know
9210 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
9211 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
9212 // target-specific builtins, perhaps?
9213 if (!FD->getAttr<FormatAttr>())
9214 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
9216 Name->isStr("vasprintf") ? 0 : 3));
9219 if (Name->isStr("__CFStringMakeConstantString")) {
9220 // We already have a __builtin___CFStringMakeConstantString,
9221 // but builds that use -fno-constant-cfstrings don't go through that.
9222 if (!FD->getAttr<FormatArgAttr>())
9223 FD->addAttr(::new (Context) FormatArgAttr(FD->getLocation(), Context, 1));
9227 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
9228 TypeSourceInfo *TInfo) {
9229 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
9230 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
9233 assert(D.isInvalidType() && "no declarator info for valid type");
9234 TInfo = Context.getTrivialTypeSourceInfo(T);
9237 // Scope manipulation handled by caller.
9238 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
9240 D.getIdentifierLoc(),
9244 // Bail out immediately if we have an invalid declaration.
9245 if (D.isInvalidType()) {
9246 NewTD->setInvalidDecl();
9250 if (D.getDeclSpec().isModulePrivateSpecified()) {
9251 if (CurContext->isFunctionOrMethod())
9252 Diag(NewTD->getLocation(), diag::err_module_private_local)
9253 << 2 << NewTD->getDeclName()
9254 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
9255 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
9257 NewTD->setModulePrivate();
9260 // C++ [dcl.typedef]p8:
9261 // If the typedef declaration defines an unnamed class (or
9262 // enum), the first typedef-name declared by the declaration
9263 // to be that class type (or enum type) is used to denote the
9264 // class type (or enum type) for linkage purposes only.
9265 // We need to check whether the type was declared in the declaration.
9266 switch (D.getDeclSpec().getTypeSpecType()) {
9272 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
9274 // Do nothing if the tag is not anonymous or already has an
9275 // associated typedef (from an earlier typedef in this decl group).
9276 if (tagFromDeclSpec->getIdentifier()) break;
9277 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break;
9279 // A well-formed anonymous tag must always be a TUK_Definition.
9280 assert(tagFromDeclSpec->isThisDeclarationADefinition());
9282 // The type must match the tag exactly; no qualifiers allowed.
9283 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec)))
9286 // Otherwise, set this is the anon-decl typedef for the tag.
9287 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
9299 /// \brief Check that this is a valid underlying type for an enum declaration.
9300 bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) {
9301 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
9302 QualType T = TI->getType();
9304 if (T->isDependentType())
9307 if (const BuiltinType *BT = T->getAs<BuiltinType>())
9308 if (BT->isInteger())
9311 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T;
9315 /// Check whether this is a valid redeclaration of a previous enumeration.
9316 /// \return true if the redeclaration was invalid.
9317 bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped,
9318 QualType EnumUnderlyingTy,
9319 const EnumDecl *Prev) {
9320 bool IsFixed = !EnumUnderlyingTy.isNull();
9322 if (IsScoped != Prev->isScoped()) {
9323 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch)
9324 << Prev->isScoped();
9325 Diag(Prev->getLocation(), diag::note_previous_use);
9329 if (IsFixed && Prev->isFixed()) {
9330 if (!EnumUnderlyingTy->isDependentType() &&
9331 !Prev->getIntegerType()->isDependentType() &&
9332 !Context.hasSameUnqualifiedType(EnumUnderlyingTy,
9333 Prev->getIntegerType())) {
9334 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch)
9335 << EnumUnderlyingTy << Prev->getIntegerType();
9336 Diag(Prev->getLocation(), diag::note_previous_use);
9339 } else if (IsFixed != Prev->isFixed()) {
9340 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch)
9342 Diag(Prev->getLocation(), diag::note_previous_use);
9349 /// \brief Get diagnostic %select index for tag kind for
9350 /// redeclaration diagnostic message.
9351 /// WARNING: Indexes apply to particular diagnostics only!
9353 /// \returns diagnostic %select index.
9354 static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) {
9356 case TTK_Struct: return 0;
9357 case TTK_Interface: return 1;
9358 case TTK_Class: return 2;
9359 default: llvm_unreachable("Invalid tag kind for redecl diagnostic!");
9363 /// \brief Determine if tag kind is a class-key compatible with
9364 /// class for redeclaration (class, struct, or __interface).
9366 /// \returns true iff the tag kind is compatible.
9367 static bool isClassCompatTagKind(TagTypeKind Tag)
9369 return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface;
9372 /// \brief Determine whether a tag with a given kind is acceptable
9373 /// as a redeclaration of the given tag declaration.
9375 /// \returns true if the new tag kind is acceptable, false otherwise.
9376 bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
9377 TagTypeKind NewTag, bool isDefinition,
9378 SourceLocation NewTagLoc,
9379 const IdentifierInfo &Name) {
9380 // C++ [dcl.type.elab]p3:
9381 // The class-key or enum keyword present in the
9382 // elaborated-type-specifier shall agree in kind with the
9383 // declaration to which the name in the elaborated-type-specifier
9384 // refers. This rule also applies to the form of
9385 // elaborated-type-specifier that declares a class-name or
9386 // friend class since it can be construed as referring to the
9387 // definition of the class. Thus, in any
9388 // elaborated-type-specifier, the enum keyword shall be used to
9389 // refer to an enumeration (7.2), the union class-key shall be
9390 // used to refer to a union (clause 9), and either the class or
9391 // struct class-key shall be used to refer to a class (clause 9)
9392 // declared using the class or struct class-key.
9393 TagTypeKind OldTag = Previous->getTagKind();
9394 if (!isDefinition || !isClassCompatTagKind(NewTag))
9395 if (OldTag == NewTag)
9398 if (isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag)) {
9399 // Warn about the struct/class tag mismatch.
9400 bool isTemplate = false;
9401 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
9402 isTemplate = Record->getDescribedClassTemplate();
9404 if (!ActiveTemplateInstantiations.empty()) {
9405 // In a template instantiation, do not offer fix-its for tag mismatches
9406 // since they usually mess up the template instead of fixing the problem.
9407 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
9408 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
9409 << getRedeclDiagFromTagKind(OldTag);
9414 // On definitions, check previous tags and issue a fix-it for each
9415 // one that doesn't match the current tag.
9416 if (Previous->getDefinition()) {
9417 // Don't suggest fix-its for redefinitions.
9421 bool previousMismatch = false;
9422 for (TagDecl::redecl_iterator I(Previous->redecls_begin()),
9423 E(Previous->redecls_end()); I != E; ++I) {
9424 if (I->getTagKind() != NewTag) {
9425 if (!previousMismatch) {
9426 previousMismatch = true;
9427 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
9428 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
9429 << getRedeclDiagFromTagKind(I->getTagKind());
9431 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
9432 << getRedeclDiagFromTagKind(NewTag)
9433 << FixItHint::CreateReplacement(I->getInnerLocStart(),
9434 TypeWithKeyword::getTagTypeKindName(NewTag));
9440 // Check for a previous definition. If current tag and definition
9441 // are same type, do nothing. If no definition, but disagree with
9442 // with previous tag type, give a warning, but no fix-it.
9443 const TagDecl *Redecl = Previous->getDefinition() ?
9444 Previous->getDefinition() : Previous;
9445 if (Redecl->getTagKind() == NewTag) {
9449 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
9450 << getRedeclDiagFromTagKind(NewTag) << isTemplate << &Name
9451 << getRedeclDiagFromTagKind(OldTag);
9452 Diag(Redecl->getLocation(), diag::note_previous_use);
9454 // If there is a previous defintion, suggest a fix-it.
9455 if (Previous->getDefinition()) {
9456 Diag(NewTagLoc, diag::note_struct_class_suggestion)
9457 << getRedeclDiagFromTagKind(Redecl->getTagKind())
9458 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
9459 TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind()));
9467 /// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
9468 /// former case, Name will be non-null. In the later case, Name will be null.
9469 /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
9470 /// reference/declaration/definition of a tag.
9471 Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
9472 SourceLocation KWLoc, CXXScopeSpec &SS,
9473 IdentifierInfo *Name, SourceLocation NameLoc,
9474 AttributeList *Attr, AccessSpecifier AS,
9475 SourceLocation ModulePrivateLoc,
9476 MultiTemplateParamsArg TemplateParameterLists,
9477 bool &OwnedDecl, bool &IsDependent,
9478 SourceLocation ScopedEnumKWLoc,
9479 bool ScopedEnumUsesClassTag,
9480 TypeResult UnderlyingType) {
9481 // If this is not a definition, it must have a name.
9482 IdentifierInfo *OrigName = Name;
9483 assert((Name != 0 || TUK == TUK_Definition) &&
9484 "Nameless record must be a definition!");
9485 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
9488 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
9489 bool ScopedEnum = ScopedEnumKWLoc.isValid();
9491 // FIXME: Check explicit specializations more carefully.
9492 bool isExplicitSpecialization = false;
9493 bool Invalid = false;
9495 // We only need to do this matching if we have template parameters
9496 // or a scope specifier, which also conveniently avoids this work
9497 // for non-C++ cases.
9498 if (TemplateParameterLists.size() > 0 ||
9499 (SS.isNotEmpty() && TUK != TUK_Reference)) {
9500 if (TemplateParameterList *TemplateParams
9501 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS,
9502 TemplateParameterLists.data(),
9503 TemplateParameterLists.size(),
9505 isExplicitSpecialization,
9507 if (Kind == TTK_Enum) {
9508 Diag(KWLoc, diag::err_enum_template);
9512 if (TemplateParams->size() > 0) {
9513 // This is a declaration or definition of a class template (which may
9514 // be a member of another template).
9520 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
9521 SS, Name, NameLoc, Attr,
9524 TemplateParameterLists.size()-1,
9525 TemplateParameterLists.data());
9526 return Result.get();
9528 // The "template<>" header is extraneous.
9529 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
9530 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
9531 isExplicitSpecialization = true;
9536 // Figure out the underlying type if this a enum declaration. We need to do
9537 // this early, because it's needed to detect if this is an incompatible
9539 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
9541 if (Kind == TTK_Enum) {
9542 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
9543 // No underlying type explicitly specified, or we failed to parse the
9544 // type, default to int.
9545 EnumUnderlying = Context.IntTy.getTypePtr();
9546 else if (UnderlyingType.get()) {
9547 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
9548 // integral type; any cv-qualification is ignored.
9549 TypeSourceInfo *TI = 0;
9550 GetTypeFromParser(UnderlyingType.get(), &TI);
9551 EnumUnderlying = TI;
9553 if (CheckEnumUnderlyingType(TI))
9554 // Recover by falling back to int.
9555 EnumUnderlying = Context.IntTy.getTypePtr();
9557 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI,
9558 UPPC_FixedUnderlyingType))
9559 EnumUnderlying = Context.IntTy.getTypePtr();
9561 } else if (getLangOpts().MicrosoftMode)
9562 // Microsoft enums are always of int type.
9563 EnumUnderlying = Context.IntTy.getTypePtr();
9566 DeclContext *SearchDC = CurContext;
9567 DeclContext *DC = CurContext;
9568 bool isStdBadAlloc = false;
9570 RedeclarationKind Redecl = ForRedeclaration;
9571 if (TUK == TUK_Friend || TUK == TUK_Reference)
9572 Redecl = NotForRedeclaration;
9574 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
9576 if (Name && SS.isNotEmpty()) {
9577 // We have a nested-name tag ('struct foo::bar').
9579 // Check for invalid 'foo::'.
9580 if (SS.isInvalid()) {
9585 // If this is a friend or a reference to a class in a dependent
9586 // context, don't try to make a decl for it.
9587 if (TUK == TUK_Friend || TUK == TUK_Reference) {
9588 DC = computeDeclContext(SS, false);
9594 DC = computeDeclContext(SS, true);
9596 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
9602 if (RequireCompleteDeclContext(SS, DC))
9606 // Look-up name inside 'foo::'.
9607 LookupQualifiedName(Previous, DC);
9609 if (Previous.isAmbiguous())
9612 if (Previous.empty()) {
9613 // Name lookup did not find anything. However, if the
9614 // nested-name-specifier refers to the current instantiation,
9615 // and that current instantiation has any dependent base
9616 // classes, we might find something at instantiation time: treat
9617 // this as a dependent elaborated-type-specifier.
9618 // But this only makes any sense for reference-like lookups.
9619 if (Previous.wasNotFoundInCurrentInstantiation() &&
9620 (TUK == TUK_Reference || TUK == TUK_Friend)) {
9625 // A tag 'foo::bar' must already exist.
9626 Diag(NameLoc, diag::err_not_tag_in_scope)
9627 << Kind << Name << DC << SS.getRange();
9633 // If this is a named struct, check to see if there was a previous forward
9634 // declaration or definition.
9635 // FIXME: We're looking into outer scopes here, even when we
9636 // shouldn't be. Doing so can result in ambiguities that we
9637 // shouldn't be diagnosing.
9638 LookupName(Previous, S);
9640 // When declaring or defining a tag, ignore ambiguities introduced
9641 // by types using'ed into this scope.
9642 if (Previous.isAmbiguous() &&
9643 (TUK == TUK_Definition || TUK == TUK_Declaration)) {
9644 LookupResult::Filter F = Previous.makeFilter();
9645 while (F.hasNext()) {
9646 NamedDecl *ND = F.next();
9647 if (ND->getDeclContext()->getRedeclContext() != SearchDC)
9653 // C++11 [namespace.memdef]p3:
9654 // If the name in a friend declaration is neither qualified nor
9655 // a template-id and the declaration is a function or an
9656 // elaborated-type-specifier, the lookup to determine whether
9657 // the entity has been previously declared shall not consider
9658 // any scopes outside the innermost enclosing namespace.
9660 // Does it matter that this should be by scope instead of by
9661 // semantic context?
9662 if (!Previous.empty() && TUK == TUK_Friend) {
9663 DeclContext *EnclosingNS = SearchDC->getEnclosingNamespaceContext();
9664 LookupResult::Filter F = Previous.makeFilter();
9665 while (F.hasNext()) {
9666 NamedDecl *ND = F.next();
9667 DeclContext *DC = ND->getDeclContext()->getRedeclContext();
9668 if (DC->isFileContext() && !EnclosingNS->Encloses(ND->getDeclContext()))
9674 // Note: there used to be some attempt at recovery here.
9675 if (Previous.isAmbiguous())
9678 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) {
9679 // FIXME: This makes sure that we ignore the contexts associated
9680 // with C structs, unions, and enums when looking for a matching
9681 // tag declaration or definition. See the similar lookup tweak
9682 // in Sema::LookupName; is there a better way to deal with this?
9683 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
9684 SearchDC = SearchDC->getParent();
9686 } else if (S->isFunctionPrototypeScope()) {
9687 // If this is an enum declaration in function prototype scope, set its
9688 // initial context to the translation unit.
9689 // FIXME: [citation needed]
9690 SearchDC = Context.getTranslationUnitDecl();
9693 if (Previous.isSingleResult() &&
9694 Previous.getFoundDecl()->isTemplateParameter()) {
9695 // Maybe we will complain about the shadowed template parameter.
9696 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
9697 // Just pretend that we didn't see the previous declaration.
9701 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace &&
9702 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
9703 // This is a declaration of or a reference to "std::bad_alloc".
9704 isStdBadAlloc = true;
9706 if (Previous.empty() && StdBadAlloc) {
9707 // std::bad_alloc has been implicitly declared (but made invisible to
9708 // name lookup). Fill in this implicit declaration as the previous
9709 // declaration, so that the declarations get chained appropriately.
9710 Previous.addDecl(getStdBadAlloc());
9714 // If we didn't find a previous declaration, and this is a reference
9715 // (or friend reference), move to the correct scope. In C++, we
9716 // also need to do a redeclaration lookup there, just in case
9717 // there's a shadow friend decl.
9718 if (Name && Previous.empty() &&
9719 (TUK == TUK_Reference || TUK == TUK_Friend)) {
9720 if (Invalid) goto CreateNewDecl;
9721 assert(SS.isEmpty());
9723 if (TUK == TUK_Reference) {
9724 // C++ [basic.scope.pdecl]p5:
9725 // -- for an elaborated-type-specifier of the form
9727 // class-key identifier
9729 // if the elaborated-type-specifier is used in the
9730 // decl-specifier-seq or parameter-declaration-clause of a
9731 // function defined in namespace scope, the identifier is
9732 // declared as a class-name in the namespace that contains
9733 // the declaration; otherwise, except as a friend
9734 // declaration, the identifier is declared in the smallest
9735 // non-class, non-function-prototype scope that contains the
9738 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
9739 // C structs and unions.
9741 // It is an error in C++ to declare (rather than define) an enum
9742 // type, including via an elaborated type specifier. We'll
9743 // diagnose that later; for now, declare the enum in the same
9744 // scope as we would have picked for any other tag type.
9746 // GNU C also supports this behavior as part of its incomplete
9747 // enum types extension, while GNU C++ does not.
9749 // Find the context where we'll be declaring the tag.
9750 // FIXME: We would like to maintain the current DeclContext as the
9752 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod())
9753 SearchDC = SearchDC->getParent();
9755 // Find the scope where we'll be declaring the tag.
9756 while (S->isClassScope() ||
9757 (getLangOpts().CPlusPlus &&
9758 S->isFunctionPrototypeScope()) ||
9759 ((S->getFlags() & Scope::DeclScope) == 0) ||
9761 ((DeclContext *)S->getEntity())->isTransparentContext()))
9764 assert(TUK == TUK_Friend);
9765 // C++ [namespace.memdef]p3:
9766 // If a friend declaration in a non-local class first declares a
9767 // class or function, the friend class or function is a member of
9768 // the innermost enclosing namespace.
9769 SearchDC = SearchDC->getEnclosingNamespaceContext();
9772 // In C++, we need to do a redeclaration lookup to properly
9773 // diagnose some problems.
9774 if (getLangOpts().CPlusPlus) {
9775 Previous.setRedeclarationKind(ForRedeclaration);
9776 LookupQualifiedName(Previous, SearchDC);
9780 if (!Previous.empty()) {
9781 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
9783 // It's okay to have a tag decl in the same scope as a typedef
9784 // which hides a tag decl in the same scope. Finding this
9785 // insanity with a redeclaration lookup can only actually happen
9788 // This is also okay for elaborated-type-specifiers, which is
9789 // technically forbidden by the current standard but which is
9790 // okay according to the likely resolution of an open issue;
9791 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
9792 if (getLangOpts().CPlusPlus) {
9793 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
9794 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
9795 TagDecl *Tag = TT->getDecl();
9796 if (Tag->getDeclName() == Name &&
9797 Tag->getDeclContext()->getRedeclContext()
9798 ->Equals(TD->getDeclContext()->getRedeclContext())) {
9801 Previous.addDecl(Tag);
9802 Previous.resolveKind();
9808 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
9809 // If this is a use of a previous tag, or if the tag is already declared
9810 // in the same scope (so that the definition/declaration completes or
9811 // rementions the tag), reuse the decl.
9812 if (TUK == TUK_Reference || TUK == TUK_Friend ||
9813 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) {
9814 // Make sure that this wasn't declared as an enum and now used as a
9815 // struct or something similar.
9816 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
9817 TUK == TUK_Definition, KWLoc,
9820 = (PrevTagDecl->getTagKind() != TTK_Enum &&
9823 Diag(KWLoc, diag::err_use_with_wrong_tag)
9825 << FixItHint::CreateReplacement(SourceRange(KWLoc),
9826 PrevTagDecl->getKindName());
9828 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
9829 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
9832 Kind = PrevTagDecl->getTagKind();
9834 // Recover by making this an anonymous redefinition.
9841 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
9842 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
9844 // If this is an elaborated-type-specifier for a scoped enumeration,
9845 // the 'class' keyword is not necessary and not permitted.
9846 if (TUK == TUK_Reference || TUK == TUK_Friend) {
9848 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference)
9849 << PrevEnum->isScoped()
9850 << FixItHint::CreateRemoval(ScopedEnumKWLoc);
9854 QualType EnumUnderlyingTy;
9855 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
9856 EnumUnderlyingTy = TI->getType();
9857 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>())
9858 EnumUnderlyingTy = QualType(T, 0);
9860 // All conflicts with previous declarations are recovered by
9861 // returning the previous declaration, unless this is a definition,
9862 // in which case we want the caller to bail out.
9863 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc,
9864 ScopedEnum, EnumUnderlyingTy, PrevEnum))
9865 return TUK == TUK_Declaration ? PrevTagDecl : 0;
9869 // If this is a use, just return the declaration we found.
9871 // FIXME: In the future, return a variant or some other clue
9872 // for the consumer of this Decl to know it doesn't own it.
9873 // For our current ASTs this shouldn't be a problem, but will
9874 // need to be changed with DeclGroups.
9875 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() ||
9876 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend)
9879 // Diagnose attempts to redefine a tag.
9880 if (TUK == TUK_Definition) {
9881 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
9882 // If we're defining a specialization and the previous definition
9883 // is from an implicit instantiation, don't emit an error
9884 // here; we'll catch this in the general case below.
9885 bool IsExplicitSpecializationAfterInstantiation = false;
9886 if (isExplicitSpecialization) {
9887 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def))
9888 IsExplicitSpecializationAfterInstantiation =
9889 RD->getTemplateSpecializationKind() !=
9890 TSK_ExplicitSpecialization;
9891 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def))
9892 IsExplicitSpecializationAfterInstantiation =
9893 ED->getTemplateSpecializationKind() !=
9894 TSK_ExplicitSpecialization;
9897 if (!IsExplicitSpecializationAfterInstantiation) {
9898 // A redeclaration in function prototype scope in C isn't
9899 // visible elsewhere, so merely issue a warning.
9900 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope())
9901 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name;
9903 Diag(NameLoc, diag::err_redefinition) << Name;
9904 Diag(Def->getLocation(), diag::note_previous_definition);
9905 // If this is a redefinition, recover by making this
9906 // struct be anonymous, which will make any later
9907 // references get the previous definition.
9913 // If the type is currently being defined, complain
9914 // about a nested redefinition.
9916 = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
9917 if (Tag->isBeingDefined()) {
9918 Diag(NameLoc, diag::err_nested_redefinition) << Name;
9919 Diag(PrevTagDecl->getLocation(),
9920 diag::note_previous_definition);
9927 // Okay, this is definition of a previously declared or referenced
9928 // tag PrevDecl. We're going to create a new Decl for it.
9931 // If we get here we have (another) forward declaration or we
9932 // have a definition. Just create a new decl.
9935 // If we get here, this is a definition of a new tag type in a nested
9936 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
9937 // new decl/type. We set PrevDecl to NULL so that the entities
9938 // have distinct types.
9941 // If we get here, we're going to create a new Decl. If PrevDecl
9942 // is non-NULL, it's a definition of the tag declared by
9943 // PrevDecl. If it's NULL, we have a new definition.
9946 // Otherwise, PrevDecl is not a tag, but was found with tag
9947 // lookup. This is only actually possible in C++, where a few
9948 // things like templates still live in the tag namespace.
9950 // Use a better diagnostic if an elaborated-type-specifier
9951 // found the wrong kind of type on the first
9952 // (non-redeclaration) lookup.
9953 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
9954 !Previous.isForRedeclaration()) {
9956 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
9957 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
9958 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
9959 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
9960 Diag(PrevDecl->getLocation(), diag::note_declared_at);
9963 // Otherwise, only diagnose if the declaration is in scope.
9964 } else if (!isDeclInScope(PrevDecl, SearchDC, S,
9965 isExplicitSpecialization)) {
9968 // Diagnose implicit declarations introduced by elaborated types.
9969 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
9971 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
9972 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
9973 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
9974 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
9975 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
9978 // Otherwise it's a declaration. Call out a particularly common
9980 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
9982 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
9983 Diag(NameLoc, diag::err_tag_definition_of_typedef)
9984 << Name << Kind << TND->getUnderlyingType();
9985 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
9988 // Otherwise, diagnose.
9990 // The tag name clashes with something else in the target scope,
9991 // issue an error and recover by making this tag be anonymous.
9992 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
9993 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
9998 // The existing declaration isn't relevant to us; we're in a
9999 // new scope, so clear out the previous declaration.
10006 TagDecl *PrevDecl = 0;
10007 if (Previous.isSingleResult())
10008 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
10010 // If there is an identifier, use the location of the identifier as the
10011 // location of the decl, otherwise use the location of the struct/union
10013 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
10015 // Otherwise, create a new declaration. If there is a previous
10016 // declaration of the same entity, the two will be linked via
10020 bool IsForwardReference = false;
10021 if (Kind == TTK_Enum) {
10022 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
10023 // enum X { A, B, C } D; D should chain to X.
10024 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
10025 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
10026 ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
10027 // If this is an undefined enum, warn.
10028 if (TUK != TUK_Definition && !Invalid) {
10030 if ((getLangOpts().CPlusPlus11 || getLangOpts().ObjC2) &&
10031 cast<EnumDecl>(New)->isFixed()) {
10032 // C++0x: 7.2p2: opaque-enum-declaration.
10033 // Conflicts are diagnosed above. Do nothing.
10035 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
10036 Diag(Loc, diag::ext_forward_ref_enum_def)
10038 Diag(Def->getLocation(), diag::note_previous_definition);
10040 unsigned DiagID = diag::ext_forward_ref_enum;
10041 if (getLangOpts().MicrosoftMode)
10042 DiagID = diag::ext_ms_forward_ref_enum;
10043 else if (getLangOpts().CPlusPlus)
10044 DiagID = diag::err_forward_ref_enum;
10047 // If this is a forward-declared reference to an enumeration, make a
10048 // note of it; we won't actually be introducing the declaration into
10049 // the declaration context.
10050 if (TUK == TUK_Reference)
10051 IsForwardReference = true;
10055 if (EnumUnderlying) {
10056 EnumDecl *ED = cast<EnumDecl>(New);
10057 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
10058 ED->setIntegerTypeSourceInfo(TI);
10060 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
10061 ED->setPromotionType(ED->getIntegerType());
10065 // struct/union/class
10067 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
10068 // struct X { int A; } D; D should chain to X.
10069 if (getLangOpts().CPlusPlus) {
10070 // FIXME: Look for a way to use RecordDecl for simple structs.
10071 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
10072 cast_or_null<CXXRecordDecl>(PrevDecl));
10074 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
10075 StdBadAlloc = cast<CXXRecordDecl>(New);
10077 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
10078 cast_or_null<RecordDecl>(PrevDecl));
10081 // Maybe add qualifier info.
10082 if (SS.isNotEmpty()) {
10084 // If this is either a declaration or a definition, check the
10085 // nested-name-specifier against the current context. We don't do this
10086 // for explicit specializations, because they have similar checking
10087 // (with more specific diagnostics) in the call to
10088 // CheckMemberSpecialization, below.
10089 if (!isExplicitSpecialization &&
10090 (TUK == TUK_Definition || TUK == TUK_Declaration) &&
10091 diagnoseQualifiedDeclaration(SS, DC, OrigName, NameLoc))
10094 New->setQualifierInfo(SS.getWithLocInContext(Context));
10095 if (TemplateParameterLists.size() > 0) {
10096 New->setTemplateParameterListsInfo(Context,
10097 TemplateParameterLists.size(),
10098 TemplateParameterLists.data());
10105 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
10106 // Add alignment attributes if necessary; these attributes are checked when
10107 // the ASTContext lays out the structure.
10109 // It is important for implementing the correct semantics that this
10110 // happen here (in act on tag decl). The #pragma pack stack is
10111 // maintained as a result of parser callbacks which can occur at
10112 // many points during the parsing of a struct declaration (because
10113 // the #pragma tokens are effectively skipped over during the
10114 // parsing of the struct).
10115 if (TUK == TUK_Definition) {
10116 AddAlignmentAttributesForRecord(RD);
10117 AddMsStructLayoutForRecord(RD);
10121 if (ModulePrivateLoc.isValid()) {
10122 if (isExplicitSpecialization)
10123 Diag(New->getLocation(), diag::err_module_private_specialization)
10125 << FixItHint::CreateRemoval(ModulePrivateLoc);
10126 // __module_private__ does not apply to local classes. However, we only
10127 // diagnose this as an error when the declaration specifiers are
10128 // freestanding. Here, we just ignore the __module_private__.
10129 else if (!SearchDC->isFunctionOrMethod())
10130 New->setModulePrivate();
10133 // If this is a specialization of a member class (of a class template),
10134 // check the specialization.
10135 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
10139 New->setInvalidDecl();
10142 ProcessDeclAttributeList(S, New, Attr);
10144 // If we're declaring or defining a tag in function prototype scope
10145 // in C, note that this type can only be used within the function.
10146 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus)
10147 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
10149 // Set the lexical context. If the tag has a C++ scope specifier, the
10150 // lexical context will be different from the semantic context.
10151 New->setLexicalDeclContext(CurContext);
10153 // Mark this as a friend decl if applicable.
10154 // In Microsoft mode, a friend declaration also acts as a forward
10155 // declaration so we always pass true to setObjectOfFriendDecl to make
10156 // the tag name visible.
10157 if (TUK == TUK_Friend)
10158 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() ||
10159 getLangOpts().MicrosoftExt);
10161 // Set the access specifier.
10162 if (!Invalid && SearchDC->isRecord())
10163 SetMemberAccessSpecifier(New, PrevDecl, AS);
10165 if (TUK == TUK_Definition)
10166 New->startDefinition();
10168 // If this has an identifier, add it to the scope stack.
10169 if (TUK == TUK_Friend) {
10170 // We might be replacing an existing declaration in the lookup tables;
10171 // if so, borrow its access specifier.
10173 New->setAccess(PrevDecl->getAccess());
10175 DeclContext *DC = New->getDeclContext()->getRedeclContext();
10176 DC->makeDeclVisibleInContext(New);
10177 if (Name) // can be null along some error paths
10178 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
10179 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
10181 S = getNonFieldDeclScope(S);
10182 PushOnScopeChains(New, S, !IsForwardReference);
10183 if (IsForwardReference)
10184 SearchDC->makeDeclVisibleInContext(New);
10187 CurContext->addDecl(New);
10190 // If this is the C FILE type, notify the AST context.
10191 if (IdentifierInfo *II = New->getIdentifier())
10192 if (!New->isInvalidDecl() &&
10193 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
10195 Context.setFILEDecl(New);
10197 // If we were in function prototype scope (and not in C++ mode), add this
10198 // tag to the list of decls to inject into the function definition scope.
10199 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus &&
10200 InFunctionDeclarator && Name)
10201 DeclsInPrototypeScope.push_back(New);
10204 mergeDeclAttributes(New, PrevDecl);
10206 // If there's a #pragma GCC visibility in scope, set the visibility of this
10208 AddPushedVisibilityAttribute(New);
10211 // In C++, don't return an invalid declaration. We can't recover well from
10212 // the cases where we make the type anonymous.
10213 return (Invalid && getLangOpts().CPlusPlus) ? 0 : New;
10216 void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
10217 AdjustDeclIfTemplate(TagD);
10218 TagDecl *Tag = cast<TagDecl>(TagD);
10220 // Enter the tag context.
10221 PushDeclContext(S, Tag);
10223 ActOnDocumentableDecl(TagD);
10225 // If there's a #pragma GCC visibility in scope, set the visibility of this
10227 AddPushedVisibilityAttribute(Tag);
10230 Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
10231 assert(isa<ObjCContainerDecl>(IDecl) &&
10232 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
10233 DeclContext *OCD = cast<DeclContext>(IDecl);
10234 assert(getContainingDC(OCD) == CurContext &&
10235 "The next DeclContext should be lexically contained in the current one.");
10240 void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
10241 SourceLocation FinalLoc,
10242 SourceLocation LBraceLoc) {
10243 AdjustDeclIfTemplate(TagD);
10244 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
10246 FieldCollector->StartClass();
10248 if (!Record->getIdentifier())
10251 if (FinalLoc.isValid())
10252 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context));
10255 // [...] The class-name is also inserted into the scope of the
10256 // class itself; this is known as the injected-class-name. For
10257 // purposes of access checking, the injected-class-name is treated
10258 // as if it were a public member name.
10259 CXXRecordDecl *InjectedClassName
10260 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
10261 Record->getLocStart(), Record->getLocation(),
10262 Record->getIdentifier(),
10264 /*DelayTypeCreation=*/true);
10265 Context.getTypeDeclType(InjectedClassName, Record);
10266 InjectedClassName->setImplicit();
10267 InjectedClassName->setAccess(AS_public);
10268 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
10269 InjectedClassName->setDescribedClassTemplate(Template);
10270 PushOnScopeChains(InjectedClassName, S);
10271 assert(InjectedClassName->isInjectedClassName() &&
10272 "Broken injected-class-name");
10275 void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
10276 SourceLocation RBraceLoc) {
10277 AdjustDeclIfTemplate(TagD);
10278 TagDecl *Tag = cast<TagDecl>(TagD);
10279 Tag->setRBraceLoc(RBraceLoc);
10281 // Make sure we "complete" the definition even it is invalid.
10282 if (Tag->isBeingDefined()) {
10283 assert(Tag->isInvalidDecl() && "We should already have completed it");
10284 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
10285 RD->completeDefinition();
10288 if (isa<CXXRecordDecl>(Tag))
10289 FieldCollector->FinishClass();
10291 // Exit this scope of this tag's definition.
10294 if (getCurLexicalContext()->isObjCContainer() &&
10295 Tag->getDeclContext()->isFileContext())
10296 Tag->setTopLevelDeclInObjCContainer();
10298 // Notify the consumer that we've defined a tag.
10299 if (!Tag->isInvalidDecl())
10300 Consumer.HandleTagDeclDefinition(Tag);
10303 void Sema::ActOnObjCContainerFinishDefinition() {
10304 // Exit this scope of this interface definition.
10308 void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) {
10309 assert(DC == CurContext && "Mismatch of container contexts");
10310 OriginalLexicalContext = DC;
10311 ActOnObjCContainerFinishDefinition();
10314 void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) {
10315 ActOnObjCContainerStartDefinition(cast<Decl>(DC));
10316 OriginalLexicalContext = 0;
10319 void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
10320 AdjustDeclIfTemplate(TagD);
10321 TagDecl *Tag = cast<TagDecl>(TagD);
10322 Tag->setInvalidDecl();
10324 // Make sure we "complete" the definition even it is invalid.
10325 if (Tag->isBeingDefined()) {
10326 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
10327 RD->completeDefinition();
10330 // We're undoing ActOnTagStartDefinition here, not
10331 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
10332 // the FieldCollector.
10337 // Note that FieldName may be null for anonymous bitfields.
10338 ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
10339 IdentifierInfo *FieldName,
10340 QualType FieldTy, Expr *BitWidth,
10342 // Default to true; that shouldn't confuse checks for emptiness
10346 // C99 6.7.2.1p4 - verify the field type.
10347 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
10348 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
10349 // Handle incomplete types with specific error.
10350 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
10351 return ExprError();
10353 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
10354 << FieldName << FieldTy << BitWidth->getSourceRange();
10355 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
10356 << FieldTy << BitWidth->getSourceRange();
10357 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
10358 UPPC_BitFieldWidth))
10359 return ExprError();
10361 // If the bit-width is type- or value-dependent, don't try to check
10363 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
10364 return Owned(BitWidth);
10366 llvm::APSInt Value;
10367 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value);
10368 if (ICE.isInvalid())
10370 BitWidth = ICE.take();
10372 if (Value != 0 && ZeroWidth)
10373 *ZeroWidth = false;
10375 // Zero-width bitfield is ok for anonymous field.
10376 if (Value == 0 && FieldName)
10377 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
10379 if (Value.isSigned() && Value.isNegative()) {
10381 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
10382 << FieldName << Value.toString(10);
10383 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
10384 << Value.toString(10);
10387 if (!FieldTy->isDependentType()) {
10388 uint64_t TypeSize = Context.getTypeSize(FieldTy);
10389 if (Value.getZExtValue() > TypeSize) {
10390 if (!getLangOpts().CPlusPlus) {
10392 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
10393 << FieldName << (unsigned)Value.getZExtValue()
10394 << (unsigned)TypeSize;
10396 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
10397 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
10401 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
10402 << FieldName << (unsigned)Value.getZExtValue()
10403 << (unsigned)TypeSize;
10405 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
10406 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
10410 return Owned(BitWidth);
10413 /// ActOnField - Each field of a C struct/union is passed into this in order
10414 /// to create a FieldDecl object for it.
10415 Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
10416 Declarator &D, Expr *BitfieldWidth) {
10417 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
10418 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
10419 /*InitStyle=*/ICIS_NoInit, AS_public);
10423 /// HandleField - Analyze a field of a C struct or a C++ data member.
10425 FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
10426 SourceLocation DeclStart,
10427 Declarator &D, Expr *BitWidth,
10428 InClassInitStyle InitStyle,
10429 AccessSpecifier AS) {
10430 IdentifierInfo *II = D.getIdentifier();
10431 SourceLocation Loc = DeclStart;
10432 if (II) Loc = D.getIdentifierLoc();
10434 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
10435 QualType T = TInfo->getType();
10436 if (getLangOpts().CPlusPlus) {
10437 CheckExtraCXXDefaultArguments(D);
10439 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
10440 UPPC_DataMemberType)) {
10441 D.setInvalidType();
10443 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
10447 // TR 18037 does not allow fields to be declared with address spaces.
10448 if (T.getQualifiers().hasAddressSpace()) {
10449 Diag(Loc, diag::err_field_with_address_space);
10450 D.setInvalidType();
10453 // OpenCL 1.2 spec, s6.9 r:
10454 // The event type cannot be used to declare a structure or union field.
10455 if (LangOpts.OpenCL && T->isEventT()) {
10456 Diag(Loc, diag::err_event_t_struct_field);
10457 D.setInvalidType();
10460 DiagnoseFunctionSpecifiers(D.getDeclSpec());
10462 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
10463 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
10464 diag::err_invalid_thread)
10465 << DeclSpec::getSpecifierName(TSCS);
10467 // Check to see if this name was declared as a member previously
10468 NamedDecl *PrevDecl = 0;
10469 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
10470 LookupName(Previous, S);
10471 switch (Previous.getResultKind()) {
10472 case LookupResult::Found:
10473 case LookupResult::FoundUnresolvedValue:
10474 PrevDecl = Previous.getAsSingle<NamedDecl>();
10477 case LookupResult::FoundOverloaded:
10478 PrevDecl = Previous.getRepresentativeDecl();
10481 case LookupResult::NotFound:
10482 case LookupResult::NotFoundInCurrentInstantiation:
10483 case LookupResult::Ambiguous:
10486 Previous.suppressDiagnostics();
10488 if (PrevDecl && PrevDecl->isTemplateParameter()) {
10489 // Maybe we will complain about the shadowed template parameter.
10490 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
10491 // Just pretend that we didn't see the previous declaration.
10495 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
10499 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
10500 SourceLocation TSSL = D.getLocStart();
10502 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle,
10503 TSSL, AS, PrevDecl, &D);
10505 if (NewFD->isInvalidDecl())
10506 Record->setInvalidDecl();
10508 if (D.getDeclSpec().isModulePrivateSpecified())
10509 NewFD->setModulePrivate();
10511 if (NewFD->isInvalidDecl() && PrevDecl) {
10512 // Don't introduce NewFD into scope; there's already something
10513 // with the same name in the same scope.
10515 PushOnScopeChains(NewFD, S);
10517 Record->addDecl(NewFD);
10522 /// \brief Build a new FieldDecl and check its well-formedness.
10524 /// This routine builds a new FieldDecl given the fields name, type,
10525 /// record, etc. \p PrevDecl should refer to any previous declaration
10526 /// with the same name and in the same scope as the field to be
10529 /// \returns a new FieldDecl.
10531 /// \todo The Declarator argument is a hack. It will be removed once
10532 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
10533 TypeSourceInfo *TInfo,
10534 RecordDecl *Record, SourceLocation Loc,
10535 bool Mutable, Expr *BitWidth,
10536 InClassInitStyle InitStyle,
10537 SourceLocation TSSL,
10538 AccessSpecifier AS, NamedDecl *PrevDecl,
10540 IdentifierInfo *II = Name.getAsIdentifierInfo();
10541 bool InvalidDecl = false;
10542 if (D) InvalidDecl = D->isInvalidType();
10544 // If we receive a broken type, recover by assuming 'int' and
10545 // marking this declaration as invalid.
10547 InvalidDecl = true;
10551 QualType EltTy = Context.getBaseElementType(T);
10552 if (!EltTy->isDependentType()) {
10553 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
10554 // Fields of incomplete type force their record to be invalid.
10555 Record->setInvalidDecl();
10556 InvalidDecl = true;
10559 EltTy->isIncompleteType(&Def);
10560 if (Def && Def->isInvalidDecl()) {
10561 Record->setInvalidDecl();
10562 InvalidDecl = true;
10567 // OpenCL v1.2 s6.9.c: bitfields are not supported.
10568 if (BitWidth && getLangOpts().OpenCL) {
10569 Diag(Loc, diag::err_opencl_bitfields);
10570 InvalidDecl = true;
10573 // C99 6.7.2.1p8: A member of a structure or union may have any type other
10574 // than a variably modified type.
10575 if (!InvalidDecl && T->isVariablyModifiedType()) {
10576 bool SizeIsNegative;
10577 llvm::APSInt Oversized;
10579 TypeSourceInfo *FixedTInfo =
10580 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
10584 Diag(Loc, diag::warn_illegal_constant_array_size);
10585 TInfo = FixedTInfo;
10586 T = FixedTInfo->getType();
10588 if (SizeIsNegative)
10589 Diag(Loc, diag::err_typecheck_negative_array_size);
10590 else if (Oversized.getBoolValue())
10591 Diag(Loc, diag::err_array_too_large)
10592 << Oversized.toString(10);
10594 Diag(Loc, diag::err_typecheck_field_variable_size);
10595 InvalidDecl = true;
10599 // Fields can not have abstract class types
10600 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
10601 diag::err_abstract_type_in_decl,
10602 AbstractFieldType))
10603 InvalidDecl = true;
10605 bool ZeroWidth = false;
10606 // If this is declared as a bit-field, check the bit-field.
10607 if (!InvalidDecl && BitWidth) {
10608 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take();
10610 InvalidDecl = true;
10616 // Check that 'mutable' is consistent with the type of the declaration.
10617 if (!InvalidDecl && Mutable) {
10618 unsigned DiagID = 0;
10619 if (T->isReferenceType())
10620 DiagID = diag::err_mutable_reference;
10621 else if (T.isConstQualified())
10622 DiagID = diag::err_mutable_const;
10625 SourceLocation ErrLoc = Loc;
10626 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
10627 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
10628 Diag(ErrLoc, DiagID);
10630 InvalidDecl = true;
10634 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
10635 BitWidth, Mutable, InitStyle);
10637 NewFD->setInvalidDecl();
10639 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
10640 Diag(Loc, diag::err_duplicate_member) << II;
10641 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
10642 NewFD->setInvalidDecl();
10645 if (!InvalidDecl && getLangOpts().CPlusPlus) {
10646 if (Record->isUnion()) {
10647 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
10648 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
10649 if (RDecl->getDefinition()) {
10650 // C++ [class.union]p1: An object of a class with a non-trivial
10651 // constructor, a non-trivial copy constructor, a non-trivial
10652 // destructor, or a non-trivial copy assignment operator
10653 // cannot be a member of a union, nor can an array of such
10655 if (CheckNontrivialField(NewFD))
10656 NewFD->setInvalidDecl();
10660 // C++ [class.union]p1: If a union contains a member of reference type,
10661 // the program is ill-formed.
10662 if (EltTy->isReferenceType()) {
10663 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type)
10664 << NewFD->getDeclName() << EltTy;
10665 NewFD->setInvalidDecl();
10670 // FIXME: We need to pass in the attributes given an AST
10671 // representation, not a parser representation.
10673 // FIXME: The current scope is almost... but not entirely... correct here.
10674 ProcessDeclAttributes(getCurScope(), NewFD, *D);
10676 if (NewFD->hasAttrs())
10677 CheckAlignasUnderalignment(NewFD);
10680 // In auto-retain/release, infer strong retension for fields of
10681 // retainable type.
10682 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
10683 NewFD->setInvalidDecl();
10685 if (T.isObjCGCWeak())
10686 Diag(Loc, diag::warn_attribute_weak_on_field);
10688 NewFD->setAccess(AS);
10692 bool Sema::CheckNontrivialField(FieldDecl *FD) {
10694 assert(getLangOpts().CPlusPlus && "valid check only for C++");
10696 if (FD->isInvalidDecl())
10699 QualType EltTy = Context.getBaseElementType(FD->getType());
10700 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
10701 CXXRecordDecl *RDecl = cast<CXXRecordDecl>(RT->getDecl());
10702 if (RDecl->getDefinition()) {
10703 // We check for copy constructors before constructors
10704 // because otherwise we'll never get complaints about
10705 // copy constructors.
10707 CXXSpecialMember member = CXXInvalid;
10708 // We're required to check for any non-trivial constructors. Since the
10709 // implicit default constructor is suppressed if there are any
10710 // user-declared constructors, we just need to check that there is a
10711 // trivial default constructor and a trivial copy constructor. (We don't
10712 // worry about move constructors here, since this is a C++98 check.)
10713 if (RDecl->hasNonTrivialCopyConstructor())
10714 member = CXXCopyConstructor;
10715 else if (!RDecl->hasTrivialDefaultConstructor())
10716 member = CXXDefaultConstructor;
10717 else if (RDecl->hasNonTrivialCopyAssignment())
10718 member = CXXCopyAssignment;
10719 else if (RDecl->hasNonTrivialDestructor())
10720 member = CXXDestructor;
10722 if (member != CXXInvalid) {
10723 if (!getLangOpts().CPlusPlus11 &&
10724 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) {
10725 // Objective-C++ ARC: it is an error to have a non-trivial field of
10726 // a union. However, system headers in Objective-C programs
10727 // occasionally have Objective-C lifetime objects within unions,
10728 // and rather than cause the program to fail, we make those
10729 // members unavailable.
10730 SourceLocation Loc = FD->getLocation();
10731 if (getSourceManager().isInSystemHeader(Loc)) {
10732 if (!FD->hasAttr<UnavailableAttr>())
10733 FD->addAttr(new (Context) UnavailableAttr(Loc, Context,
10734 "this system field has retaining ownership"));
10739 Diag(FD->getLocation(), getLangOpts().CPlusPlus11 ?
10740 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member :
10741 diag::err_illegal_union_or_anon_struct_member)
10742 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
10743 DiagnoseNontrivial(RDecl, member);
10744 return !getLangOpts().CPlusPlus11;
10752 /// TranslateIvarVisibility - Translate visibility from a token ID to an
10753 /// AST enum value.
10754 static ObjCIvarDecl::AccessControl
10755 TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
10756 switch (ivarVisibility) {
10757 default: llvm_unreachable("Unknown visitibility kind");
10758 case tok::objc_private: return ObjCIvarDecl::Private;
10759 case tok::objc_public: return ObjCIvarDecl::Public;
10760 case tok::objc_protected: return ObjCIvarDecl::Protected;
10761 case tok::objc_package: return ObjCIvarDecl::Package;
10765 /// ActOnIvar - Each ivar field of an objective-c class is passed into this
10766 /// in order to create an IvarDecl object for it.
10767 Decl *Sema::ActOnIvar(Scope *S,
10768 SourceLocation DeclStart,
10769 Declarator &D, Expr *BitfieldWidth,
10770 tok::ObjCKeywordKind Visibility) {
10772 IdentifierInfo *II = D.getIdentifier();
10773 Expr *BitWidth = (Expr*)BitfieldWidth;
10774 SourceLocation Loc = DeclStart;
10775 if (II) Loc = D.getIdentifierLoc();
10777 // FIXME: Unnamed fields can be handled in various different ways, for
10778 // example, unnamed unions inject all members into the struct namespace!
10780 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
10781 QualType T = TInfo->getType();
10784 // 6.7.2.1p3, 6.7.2.1p4
10785 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take();
10787 D.setInvalidType();
10794 if (T->isReferenceType()) {
10795 Diag(Loc, diag::err_ivar_reference_type);
10796 D.setInvalidType();
10798 // C99 6.7.2.1p8: A member of a structure or union may have any type other
10799 // than a variably modified type.
10800 else if (T->isVariablyModifiedType()) {
10801 Diag(Loc, diag::err_typecheck_ivar_variable_size);
10802 D.setInvalidType();
10805 // Get the visibility (access control) for this ivar.
10806 ObjCIvarDecl::AccessControl ac =
10807 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
10808 : ObjCIvarDecl::None;
10809 // Must set ivar's DeclContext to its enclosing interface.
10810 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
10811 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl())
10813 ObjCContainerDecl *EnclosingContext;
10814 if (ObjCImplementationDecl *IMPDecl =
10815 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
10816 if (LangOpts.ObjCRuntime.isFragile()) {
10817 // Case of ivar declared in an implementation. Context is that of its class.
10818 EnclosingContext = IMPDecl->getClassInterface();
10819 assert(EnclosingContext && "Implementation has no class interface!");
10822 EnclosingContext = EnclosingDecl;
10824 if (ObjCCategoryDecl *CDecl =
10825 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
10826 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) {
10827 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
10831 EnclosingContext = EnclosingDecl;
10834 // Construct the decl.
10835 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
10836 DeclStart, Loc, II, T,
10837 TInfo, ac, (Expr *)BitfieldWidth);
10840 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
10842 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
10843 && !isa<TagDecl>(PrevDecl)) {
10844 Diag(Loc, diag::err_duplicate_member) << II;
10845 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
10846 NewID->setInvalidDecl();
10850 // Process attributes attached to the ivar.
10851 ProcessDeclAttributes(S, NewID, D);
10853 if (D.isInvalidType())
10854 NewID->setInvalidDecl();
10856 // In ARC, infer 'retaining' for ivars of retainable type.
10857 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
10858 NewID->setInvalidDecl();
10860 if (D.getDeclSpec().isModulePrivateSpecified())
10861 NewID->setModulePrivate();
10864 // FIXME: When interfaces are DeclContexts, we'll need to add
10865 // these to the interface.
10867 IdResolver.AddDecl(NewID);
10870 if (LangOpts.ObjCRuntime.isNonFragile() &&
10871 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl))
10872 Diag(Loc, diag::warn_ivars_in_interface);
10877 /// ActOnLastBitfield - This routine handles synthesized bitfields rules for
10878 /// class and class extensions. For every class \@interface and class
10879 /// extension \@interface, if the last ivar is a bitfield of any type,
10880 /// then add an implicit `char :0` ivar to the end of that interface.
10881 void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
10882 SmallVectorImpl<Decl *> &AllIvarDecls) {
10883 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty())
10886 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
10887 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
10889 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
10891 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
10893 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
10894 if (!CD->IsClassExtension())
10897 // No need to add this to end of @implementation.
10901 // All conditions are met. Add a new bitfield to the tail end of ivars.
10902 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
10903 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
10905 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
10906 DeclLoc, DeclLoc, 0,
10908 Context.getTrivialTypeSourceInfo(Context.CharTy,
10910 ObjCIvarDecl::Private, BW,
10912 AllIvarDecls.push_back(Ivar);
10915 void Sema::ActOnFields(Scope* S,
10916 SourceLocation RecLoc, Decl *EnclosingDecl,
10917 llvm::ArrayRef<Decl *> Fields,
10918 SourceLocation LBrac, SourceLocation RBrac,
10919 AttributeList *Attr) {
10920 assert(EnclosingDecl && "missing record or interface decl");
10922 // If this is an Objective-C @implementation or category and we have
10923 // new fields here we should reset the layout of the interface since
10924 // it will now change.
10925 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) {
10926 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl);
10927 switch (DC->getKind()) {
10929 case Decl::ObjCCategory:
10930 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface());
10932 case Decl::ObjCImplementation:
10934 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface());
10939 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
10941 // Start counting up the number of named members; make sure to include
10942 // members of anonymous structs and unions in the total.
10943 unsigned NumNamedMembers = 0;
10945 for (RecordDecl::decl_iterator i = Record->decls_begin(),
10946 e = Record->decls_end(); i != e; i++) {
10947 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i))
10948 if (IFD->getDeclName())
10953 // Verify that all the fields are okay.
10954 SmallVector<FieldDecl*, 32> RecFields;
10956 bool ARCErrReported = false;
10957 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
10959 FieldDecl *FD = cast<FieldDecl>(*i);
10961 // Get the type for the field.
10962 const Type *FDTy = FD->getType().getTypePtr();
10964 if (!FD->isAnonymousStructOrUnion()) {
10965 // Remember all fields written by the user.
10966 RecFields.push_back(FD);
10969 // If the field is already invalid for some reason, don't emit more
10970 // diagnostics about it.
10971 if (FD->isInvalidDecl()) {
10972 EnclosingDecl->setInvalidDecl();
10977 // A structure or union shall not contain a member with
10978 // incomplete or function type (hence, a structure shall not
10979 // contain an instance of itself, but may contain a pointer to
10980 // an instance of itself), except that the last member of a
10981 // structure with more than one named member may have incomplete
10982 // array type; such a structure (and any union containing,
10983 // possibly recursively, a member that is such a structure)
10984 // shall not be a member of a structure or an element of an
10986 if (FDTy->isFunctionType()) {
10987 // Field declared as a function.
10988 Diag(FD->getLocation(), diag::err_field_declared_as_function)
10989 << FD->getDeclName();
10990 FD->setInvalidDecl();
10991 EnclosingDecl->setInvalidDecl();
10993 } else if (FDTy->isIncompleteArrayType() && Record &&
10994 ((i + 1 == Fields.end() && !Record->isUnion()) ||
10995 ((getLangOpts().MicrosoftExt ||
10996 getLangOpts().CPlusPlus) &&
10997 (i + 1 == Fields.end() || Record->isUnion())))) {
10998 // Flexible array member.
10999 // Microsoft and g++ is more permissive regarding flexible array.
11000 // It will accept flexible array in union and also
11001 // as the sole element of a struct/class.
11002 if (getLangOpts().MicrosoftExt) {
11003 if (Record->isUnion())
11004 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms)
11005 << FD->getDeclName();
11006 else if (Fields.size() == 1)
11007 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms)
11008 << FD->getDeclName() << Record->getTagKind();
11009 } else if (getLangOpts().CPlusPlus) {
11010 if (Record->isUnion())
11011 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
11012 << FD->getDeclName();
11013 else if (Fields.size() == 1)
11014 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu)
11015 << FD->getDeclName() << Record->getTagKind();
11016 } else if (!getLangOpts().C99) {
11017 if (Record->isUnion())
11018 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
11019 << FD->getDeclName();
11021 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member)
11022 << FD->getDeclName() << Record->getTagKind();
11023 } else if (NumNamedMembers < 1) {
11024 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
11025 << FD->getDeclName();
11026 FD->setInvalidDecl();
11027 EnclosingDecl->setInvalidDecl();
11030 if (!FD->getType()->isDependentType() &&
11031 !Context.getBaseElementType(FD->getType()).isPODType(Context)) {
11032 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
11033 << FD->getDeclName() << FD->getType();
11034 FD->setInvalidDecl();
11035 EnclosingDecl->setInvalidDecl();
11038 // Okay, we have a legal flexible array member at the end of the struct.
11040 Record->setHasFlexibleArrayMember(true);
11041 } else if (!FDTy->isDependentType() &&
11042 RequireCompleteType(FD->getLocation(), FD->getType(),
11043 diag::err_field_incomplete)) {
11045 FD->setInvalidDecl();
11046 EnclosingDecl->setInvalidDecl();
11048 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
11049 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
11050 // If this is a member of a union, then entire union becomes "flexible".
11051 if (Record && Record->isUnion()) {
11052 Record->setHasFlexibleArrayMember(true);
11054 // If this is a struct/class and this is not the last element, reject
11055 // it. Note that GCC supports variable sized arrays in the middle of
11057 if (i + 1 != Fields.end())
11058 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
11059 << FD->getDeclName() << FD->getType();
11061 // We support flexible arrays at the end of structs in
11062 // other structs as an extension.
11063 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
11064 << FD->getDeclName();
11066 Record->setHasFlexibleArrayMember(true);
11070 if (isa<ObjCContainerDecl>(EnclosingDecl) &&
11071 RequireNonAbstractType(FD->getLocation(), FD->getType(),
11072 diag::err_abstract_type_in_decl,
11073 AbstractIvarType)) {
11074 // Ivars can not have abstract class types
11075 FD->setInvalidDecl();
11077 if (Record && FDTTy->getDecl()->hasObjectMember())
11078 Record->setHasObjectMember(true);
11079 if (Record && FDTTy->getDecl()->hasVolatileMember())
11080 Record->setHasVolatileMember(true);
11081 } else if (FDTy->isObjCObjectType()) {
11082 /// A field cannot be an Objective-c object
11083 Diag(FD->getLocation(), diag::err_statically_allocated_object)
11084 << FixItHint::CreateInsertion(FD->getLocation(), "*");
11085 QualType T = Context.getObjCObjectPointerType(FD->getType());
11087 } else if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported &&
11088 (!getLangOpts().CPlusPlus || Record->isUnion())) {
11089 // It's an error in ARC if a field has lifetime.
11090 // We don't want to report this in a system header, though,
11091 // so we just make the field unavailable.
11092 // FIXME: that's really not sufficient; we need to make the type
11093 // itself invalid to, say, initialize or copy.
11094 QualType T = FD->getType();
11095 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
11096 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
11097 SourceLocation loc = FD->getLocation();
11098 if (getSourceManager().isInSystemHeader(loc)) {
11099 if (!FD->hasAttr<UnavailableAttr>()) {
11100 FD->addAttr(new (Context) UnavailableAttr(loc, Context,
11101 "this system field has retaining ownership"));
11104 Diag(FD->getLocation(), diag::err_arc_objc_object_in_tag)
11105 << T->isBlockPointerType() << Record->getTagKind();
11107 ARCErrReported = true;
11109 } else if (getLangOpts().ObjC1 &&
11110 getLangOpts().getGC() != LangOptions::NonGC &&
11111 Record && !Record->hasObjectMember()) {
11112 if (FD->getType()->isObjCObjectPointerType() ||
11113 FD->getType().isObjCGCStrong())
11114 Record->setHasObjectMember(true);
11115 else if (Context.getAsArrayType(FD->getType())) {
11116 QualType BaseType = Context.getBaseElementType(FD->getType());
11117 if (BaseType->isRecordType() &&
11118 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
11119 Record->setHasObjectMember(true);
11120 else if (BaseType->isObjCObjectPointerType() ||
11121 BaseType.isObjCGCStrong())
11122 Record->setHasObjectMember(true);
11125 if (Record && FD->getType().isVolatileQualified())
11126 Record->setHasVolatileMember(true);
11127 // Keep track of the number of named members.
11128 if (FD->getIdentifier())
11132 // Okay, we successfully defined 'Record'.
11134 bool Completed = false;
11135 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
11136 if (!CXXRecord->isInvalidDecl()) {
11137 // Set access bits correctly on the directly-declared conversions.
11138 for (CXXRecordDecl::conversion_iterator
11139 I = CXXRecord->conversion_begin(),
11140 E = CXXRecord->conversion_end(); I != E; ++I)
11141 I.setAccess((*I)->getAccess());
11143 if (!CXXRecord->isDependentType()) {
11144 // Adjust user-defined destructor exception spec.
11145 if (getLangOpts().CPlusPlus11 &&
11146 CXXRecord->hasUserDeclaredDestructor())
11147 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor());
11149 // Add any implicitly-declared members to this class.
11150 AddImplicitlyDeclaredMembersToClass(CXXRecord);
11152 // If we have virtual base classes, we may end up finding multiple
11153 // final overriders for a given virtual function. Check for this
11155 if (CXXRecord->getNumVBases()) {
11156 CXXFinalOverriderMap FinalOverriders;
11157 CXXRecord->getFinalOverriders(FinalOverriders);
11159 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
11160 MEnd = FinalOverriders.end();
11162 for (OverridingMethods::iterator SO = M->second.begin(),
11163 SOEnd = M->second.end();
11164 SO != SOEnd; ++SO) {
11165 assert(SO->second.size() > 0 &&
11166 "Virtual function without overridding functions?");
11167 if (SO->second.size() == 1)
11170 // C++ [class.virtual]p2:
11171 // In a derived class, if a virtual member function of a base
11172 // class subobject has more than one final overrider the
11173 // program is ill-formed.
11174 Diag(Record->getLocation(), diag::err_multiple_final_overriders)
11175 << (const NamedDecl *)M->first << Record;
11176 Diag(M->first->getLocation(),
11177 diag::note_overridden_virtual_function);
11178 for (OverridingMethods::overriding_iterator
11179 OM = SO->second.begin(),
11180 OMEnd = SO->second.end();
11182 Diag(OM->Method->getLocation(), diag::note_final_overrider)
11183 << (const NamedDecl *)M->first << OM->Method->getParent();
11185 Record->setInvalidDecl();
11188 CXXRecord->completeDefinition(&FinalOverriders);
11196 Record->completeDefinition();
11198 if (Record->hasAttrs())
11199 CheckAlignasUnderalignment(Record);
11201 ObjCIvarDecl **ClsFields =
11202 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
11203 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
11204 ID->setEndOfDefinitionLoc(RBrac);
11205 // Add ivar's to class's DeclContext.
11206 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
11207 ClsFields[i]->setLexicalDeclContext(ID);
11208 ID->addDecl(ClsFields[i]);
11210 // Must enforce the rule that ivars in the base classes may not be
11212 if (ID->getSuperClass())
11213 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
11214 } else if (ObjCImplementationDecl *IMPDecl =
11215 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
11216 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
11217 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
11218 // Ivar declared in @implementation never belongs to the implementation.
11219 // Only it is in implementation's lexical context.
11220 ClsFields[I]->setLexicalDeclContext(IMPDecl);
11221 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
11222 IMPDecl->setIvarLBraceLoc(LBrac);
11223 IMPDecl->setIvarRBraceLoc(RBrac);
11224 } else if (ObjCCategoryDecl *CDecl =
11225 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
11226 // case of ivars in class extension; all other cases have been
11227 // reported as errors elsewhere.
11228 // FIXME. Class extension does not have a LocEnd field.
11229 // CDecl->setLocEnd(RBrac);
11230 // Add ivar's to class extension's DeclContext.
11231 // Diagnose redeclaration of private ivars.
11232 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface();
11233 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
11235 if (const ObjCIvarDecl *ClsIvar =
11236 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
11237 Diag(ClsFields[i]->getLocation(),
11238 diag::err_duplicate_ivar_declaration);
11239 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
11242 for (ObjCInterfaceDecl::known_extensions_iterator
11243 Ext = IDecl->known_extensions_begin(),
11244 ExtEnd = IDecl->known_extensions_end();
11245 Ext != ExtEnd; ++Ext) {
11246 if (const ObjCIvarDecl *ClsExtIvar
11247 = Ext->getIvarDecl(ClsFields[i]->getIdentifier())) {
11248 Diag(ClsFields[i]->getLocation(),
11249 diag::err_duplicate_ivar_declaration);
11250 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition);
11255 ClsFields[i]->setLexicalDeclContext(CDecl);
11256 CDecl->addDecl(ClsFields[i]);
11258 CDecl->setIvarLBraceLoc(LBrac);
11259 CDecl->setIvarRBraceLoc(RBrac);
11264 ProcessDeclAttributeList(S, Record, Attr);
11267 /// \brief Determine whether the given integral value is representable within
11268 /// the given type T.
11269 static bool isRepresentableIntegerValue(ASTContext &Context,
11270 llvm::APSInt &Value,
11272 assert(T->isIntegralType(Context) && "Integral type required!");
11273 unsigned BitWidth = Context.getIntWidth(T);
11275 if (Value.isUnsigned() || Value.isNonNegative()) {
11276 if (T->isSignedIntegerOrEnumerationType())
11278 return Value.getActiveBits() <= BitWidth;
11280 return Value.getMinSignedBits() <= BitWidth;
11283 // \brief Given an integral type, return the next larger integral type
11284 // (or a NULL type of no such type exists).
11285 static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
11286 // FIXME: Int128/UInt128 support, which also needs to be introduced into
11287 // enum checking below.
11288 assert(T->isIntegralType(Context) && "Integral type required!");
11289 const unsigned NumTypes = 4;
11290 QualType SignedIntegralTypes[NumTypes] = {
11291 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
11293 QualType UnsignedIntegralTypes[NumTypes] = {
11294 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
11295 Context.UnsignedLongLongTy
11298 unsigned BitWidth = Context.getTypeSize(T);
11299 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
11300 : UnsignedIntegralTypes;
11301 for (unsigned I = 0; I != NumTypes; ++I)
11302 if (Context.getTypeSize(Types[I]) > BitWidth)
11308 EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
11309 EnumConstantDecl *LastEnumConst,
11310 SourceLocation IdLoc,
11311 IdentifierInfo *Id,
11313 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
11314 llvm::APSInt EnumVal(IntWidth);
11317 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
11321 Val = DefaultLvalueConversion(Val).take();
11324 if (Enum->isDependentType() || Val->isTypeDependent())
11325 EltTy = Context.DependentTy;
11327 SourceLocation ExpLoc;
11328 if (getLangOpts().CPlusPlus11 && Enum->isFixed() &&
11329 !getLangOpts().MicrosoftMode) {
11330 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the
11331 // constant-expression in the enumerator-definition shall be a converted
11332 // constant expression of the underlying type.
11333 EltTy = Enum->getIntegerType();
11334 ExprResult Converted =
11335 CheckConvertedConstantExpression(Val, EltTy, EnumVal,
11337 if (Converted.isInvalid())
11340 Val = Converted.take();
11341 } else if (!Val->isValueDependent() &&
11342 !(Val = VerifyIntegerConstantExpression(Val,
11343 &EnumVal).take())) {
11344 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
11346 if (Enum->isFixed()) {
11347 EltTy = Enum->getIntegerType();
11349 // In Obj-C and Microsoft mode, require the enumeration value to be
11350 // representable in the underlying type of the enumeration. In C++11,
11351 // we perform a non-narrowing conversion as part of converted constant
11352 // expression checking.
11353 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
11354 if (getLangOpts().MicrosoftMode) {
11355 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
11356 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
11358 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy;
11360 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
11361 } else if (getLangOpts().CPlusPlus) {
11362 // C++11 [dcl.enum]p5:
11363 // If the underlying type is not fixed, the type of each enumerator
11364 // is the type of its initializing value:
11365 // - If an initializer is specified for an enumerator, the
11366 // initializing value has the same type as the expression.
11367 EltTy = Val->getType();
11370 // The expression that defines the value of an enumeration constant
11371 // shall be an integer constant expression that has a value
11372 // representable as an int.
11374 // Complain if the value is not representable in an int.
11375 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
11376 Diag(IdLoc, diag::ext_enum_value_not_int)
11377 << EnumVal.toString(10) << Val->getSourceRange()
11378 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
11379 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
11380 // Force the type of the expression to 'int'.
11381 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take();
11383 EltTy = Val->getType();
11390 if (Enum->isDependentType())
11391 EltTy = Context.DependentTy;
11392 else if (!LastEnumConst) {
11393 // C++0x [dcl.enum]p5:
11394 // If the underlying type is not fixed, the type of each enumerator
11395 // is the type of its initializing value:
11396 // - If no initializer is specified for the first enumerator, the
11397 // initializing value has an unspecified integral type.
11399 // GCC uses 'int' for its unspecified integral type, as does
11401 if (Enum->isFixed()) {
11402 EltTy = Enum->getIntegerType();
11405 EltTy = Context.IntTy;
11408 // Assign the last value + 1.
11409 EnumVal = LastEnumConst->getInitVal();
11411 EltTy = LastEnumConst->getType();
11413 // Check for overflow on increment.
11414 if (EnumVal < LastEnumConst->getInitVal()) {
11415 // C++0x [dcl.enum]p5:
11416 // If the underlying type is not fixed, the type of each enumerator
11417 // is the type of its initializing value:
11419 // - Otherwise the type of the initializing value is the same as
11420 // the type of the initializing value of the preceding enumerator
11421 // unless the incremented value is not representable in that type,
11422 // in which case the type is an unspecified integral type
11423 // sufficient to contain the incremented value. If no such type
11424 // exists, the program is ill-formed.
11425 QualType T = getNextLargerIntegralType(Context, EltTy);
11426 if (T.isNull() || Enum->isFixed()) {
11427 // There is no integral type larger enough to represent this
11428 // value. Complain, then allow the value to wrap around.
11429 EnumVal = LastEnumConst->getInitVal();
11430 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
11432 if (Enum->isFixed())
11433 // When the underlying type is fixed, this is ill-formed.
11434 Diag(IdLoc, diag::err_enumerator_wrapped)
11435 << EnumVal.toString(10)
11438 Diag(IdLoc, diag::warn_enumerator_too_large)
11439 << EnumVal.toString(10);
11444 // Retrieve the last enumerator's value, extent that type to the
11445 // type that is supposed to be large enough to represent the incremented
11446 // value, then increment.
11447 EnumVal = LastEnumConst->getInitVal();
11448 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
11449 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
11452 // If we're not in C++, diagnose the overflow of enumerator values,
11453 // which in C99 means that the enumerator value is not representable in
11454 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
11455 // permits enumerator values that are representable in some larger
11457 if (!getLangOpts().CPlusPlus && !T.isNull())
11458 Diag(IdLoc, diag::warn_enum_value_overflow);
11459 } else if (!getLangOpts().CPlusPlus &&
11460 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
11461 // Enforce C99 6.7.2.2p2 even when we compute the next value.
11462 Diag(IdLoc, diag::ext_enum_value_not_int)
11463 << EnumVal.toString(10) << 1;
11468 if (!EltTy->isDependentType()) {
11469 // Make the enumerator value match the signedness and size of the
11470 // enumerator's type.
11471 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy));
11472 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
11475 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
11480 Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
11481 SourceLocation IdLoc, IdentifierInfo *Id,
11482 AttributeList *Attr,
11483 SourceLocation EqualLoc, Expr *Val) {
11484 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
11485 EnumConstantDecl *LastEnumConst =
11486 cast_or_null<EnumConstantDecl>(lastEnumConst);
11488 // The scope passed in may not be a decl scope. Zip up the scope tree until
11489 // we find one that is.
11490 S = getNonFieldDeclScope(S);
11492 // Verify that there isn't already something declared with this name in this
11494 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
11496 if (PrevDecl && PrevDecl->isTemplateParameter()) {
11497 // Maybe we will complain about the shadowed template parameter.
11498 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
11499 // Just pretend that we didn't see the previous declaration.
11504 // When in C++, we may get a TagDecl with the same name; in this case the
11505 // enum constant will 'hide' the tag.
11506 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
11507 "Received TagDecl when not in C++!");
11508 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
11509 if (isa<EnumConstantDecl>(PrevDecl))
11510 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
11512 Diag(IdLoc, diag::err_redefinition) << Id;
11513 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
11518 // C++ [class.mem]p15:
11519 // If T is the name of a class, then each of the following shall have a name
11520 // different from T:
11521 // - every enumerator of every member of class T that is an unscoped
11523 if (CXXRecordDecl *Record
11524 = dyn_cast<CXXRecordDecl>(
11525 TheEnumDecl->getDeclContext()->getRedeclContext()))
11526 if (!TheEnumDecl->isScoped() &&
11527 Record->getIdentifier() && Record->getIdentifier() == Id)
11528 Diag(IdLoc, diag::err_member_name_of_class) << Id;
11530 EnumConstantDecl *New =
11531 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
11534 // Process attributes.
11535 if (Attr) ProcessDeclAttributeList(S, New, Attr);
11537 // Register this decl in the current scope stack.
11538 New->setAccess(TheEnumDecl->getAccess());
11539 PushOnScopeChains(New, S);
11542 ActOnDocumentableDecl(New);
11547 // Returns true when the enum initial expression does not trigger the
11548 // duplicate enum warning. A few common cases are exempted as follows:
11549 // Element2 = Element1
11550 // Element2 = Element1 + 1
11551 // Element2 = Element1 - 1
11552 // Where Element2 and Element1 are from the same enum.
11553 static bool ValidDuplicateEnum(EnumConstantDecl *ECD, EnumDecl *Enum) {
11554 Expr *InitExpr = ECD->getInitExpr();
11557 InitExpr = InitExpr->IgnoreImpCasts();
11559 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(InitExpr)) {
11560 if (!BO->isAdditiveOp())
11562 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(BO->getRHS());
11565 if (IL->getValue() != 1)
11568 InitExpr = BO->getLHS();
11571 // This checks if the elements are from the same enum.
11572 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InitExpr);
11576 EnumConstantDecl *EnumConstant = dyn_cast<EnumConstantDecl>(DRE->getDecl());
11580 if (cast<EnumDecl>(TagDecl::castFromDeclContext(ECD->getDeclContext())) !=
11589 bool isTombstoneOrEmptyKey;
11590 DupKey(int64_t val, bool isTombstoneOrEmptyKey)
11591 : val(val), isTombstoneOrEmptyKey(isTombstoneOrEmptyKey) {}
11594 static DupKey GetDupKey(const llvm::APSInt& Val) {
11595 return DupKey(Val.isSigned() ? Val.getSExtValue() : Val.getZExtValue(),
11599 struct DenseMapInfoDupKey {
11600 static DupKey getEmptyKey() { return DupKey(0, true); }
11601 static DupKey getTombstoneKey() { return DupKey(1, true); }
11602 static unsigned getHashValue(const DupKey Key) {
11603 return (unsigned)(Key.val * 37);
11605 static bool isEqual(const DupKey& LHS, const DupKey& RHS) {
11606 return LHS.isTombstoneOrEmptyKey == RHS.isTombstoneOrEmptyKey &&
11607 LHS.val == RHS.val;
11611 // Emits a warning when an element is implicitly set a value that
11612 // a previous element has already been set to.
11613 static void CheckForDuplicateEnumValues(Sema &S, ArrayRef<Decl *> Elements,
11615 QualType EnumType) {
11616 if (S.Diags.getDiagnosticLevel(diag::warn_duplicate_enum_values,
11617 Enum->getLocation()) ==
11618 DiagnosticsEngine::Ignored)
11620 // Avoid anonymous enums
11621 if (!Enum->getIdentifier())
11624 // Only check for small enums.
11625 if (Enum->getNumPositiveBits() > 63 || Enum->getNumNegativeBits() > 64)
11628 typedef SmallVector<EnumConstantDecl *, 3> ECDVector;
11629 typedef SmallVector<ECDVector *, 3> DuplicatesVector;
11631 typedef llvm::PointerUnion<EnumConstantDecl*, ECDVector*> DeclOrVector;
11632 typedef llvm::DenseMap<DupKey, DeclOrVector, DenseMapInfoDupKey>
11635 DuplicatesVector DupVector;
11636 ValueToVectorMap EnumMap;
11638 // Populate the EnumMap with all values represented by enum constants without
11640 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
11641 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
11643 // Null EnumConstantDecl means a previous diagnostic has been emitted for
11644 // this constant. Skip this enum since it may be ill-formed.
11649 if (ECD->getInitExpr())
11652 DupKey Key = GetDupKey(ECD->getInitVal());
11653 DeclOrVector &Entry = EnumMap[Key];
11655 // First time encountering this value.
11656 if (Entry.isNull())
11660 // Create vectors for any values that has duplicates.
11661 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
11662 EnumConstantDecl *ECD = cast<EnumConstantDecl>(Elements[i]);
11663 if (!ValidDuplicateEnum(ECD, Enum))
11666 DupKey Key = GetDupKey(ECD->getInitVal());
11668 DeclOrVector& Entry = EnumMap[Key];
11669 if (Entry.isNull())
11672 if (EnumConstantDecl *D = Entry.dyn_cast<EnumConstantDecl*>()) {
11673 // Ensure constants are different.
11677 // Create new vector and push values onto it.
11678 ECDVector *Vec = new ECDVector();
11680 Vec->push_back(ECD);
11682 // Update entry to point to the duplicates vector.
11685 // Store the vector somewhere we can consult later for quick emission of
11687 DupVector.push_back(Vec);
11691 ECDVector *Vec = Entry.get<ECDVector*>();
11692 // Make sure constants are not added more than once.
11693 if (*Vec->begin() == ECD)
11696 Vec->push_back(ECD);
11699 // Emit diagnostics.
11700 for (DuplicatesVector::iterator DupVectorIter = DupVector.begin(),
11701 DupVectorEnd = DupVector.end();
11702 DupVectorIter != DupVectorEnd; ++DupVectorIter) {
11703 ECDVector *Vec = *DupVectorIter;
11704 assert(Vec->size() > 1 && "ECDVector should have at least 2 elements.");
11706 // Emit warning for one enum constant.
11707 ECDVector::iterator I = Vec->begin();
11708 S.Diag((*I)->getLocation(), diag::warn_duplicate_enum_values)
11709 << (*I)->getName() << (*I)->getInitVal().toString(10)
11710 << (*I)->getSourceRange();
11713 // Emit one note for each of the remaining enum constants with
11715 for (ECDVector::iterator E = Vec->end(); I != E; ++I)
11716 S.Diag((*I)->getLocation(), diag::note_duplicate_element)
11717 << (*I)->getName() << (*I)->getInitVal().toString(10)
11718 << (*I)->getSourceRange();
11723 void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
11724 SourceLocation RBraceLoc, Decl *EnumDeclX,
11725 ArrayRef<Decl *> Elements,
11726 Scope *S, AttributeList *Attr) {
11727 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
11728 QualType EnumType = Context.getTypeDeclType(Enum);
11731 ProcessDeclAttributeList(S, Enum, Attr);
11733 if (Enum->isDependentType()) {
11734 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
11735 EnumConstantDecl *ECD =
11736 cast_or_null<EnumConstantDecl>(Elements[i]);
11737 if (!ECD) continue;
11739 ECD->setType(EnumType);
11742 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
11746 // TODO: If the result value doesn't fit in an int, it must be a long or long
11747 // long value. ISO C does not support this, but GCC does as an extension,
11749 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
11750 unsigned CharWidth = Context.getTargetInfo().getCharWidth();
11751 unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
11753 // Verify that all the values are okay, compute the size of the values, and
11754 // reverse the list.
11755 unsigned NumNegativeBits = 0;
11756 unsigned NumPositiveBits = 0;
11758 // Keep track of whether all elements have type int.
11759 bool AllElementsInt = true;
11761 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
11762 EnumConstantDecl *ECD =
11763 cast_or_null<EnumConstantDecl>(Elements[i]);
11764 if (!ECD) continue; // Already issued a diagnostic.
11766 const llvm::APSInt &InitVal = ECD->getInitVal();
11768 // Keep track of the size of positive and negative values.
11769 if (InitVal.isUnsigned() || InitVal.isNonNegative())
11770 NumPositiveBits = std::max(NumPositiveBits,
11771 (unsigned)InitVal.getActiveBits());
11773 NumNegativeBits = std::max(NumNegativeBits,
11774 (unsigned)InitVal.getMinSignedBits());
11776 // Keep track of whether every enum element has type int (very commmon).
11777 if (AllElementsInt)
11778 AllElementsInt = ECD->getType() == Context.IntTy;
11781 // Figure out the type that should be used for this enum.
11783 unsigned BestWidth;
11785 // C++0x N3000 [conv.prom]p3:
11786 // An rvalue of an unscoped enumeration type whose underlying
11787 // type is not fixed can be converted to an rvalue of the first
11788 // of the following types that can represent all the values of
11789 // the enumeration: int, unsigned int, long int, unsigned long
11790 // int, long long int, or unsigned long long int.
11792 // An identifier declared as an enumeration constant has type int.
11793 // The C99 rule is modified by a gcc extension
11794 QualType BestPromotionType;
11796 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
11797 // -fshort-enums is the equivalent to specifying the packed attribute on all
11798 // enum definitions.
11799 if (LangOpts.ShortEnums)
11802 if (Enum->isFixed()) {
11803 BestType = Enum->getIntegerType();
11804 if (BestType->isPromotableIntegerType())
11805 BestPromotionType = Context.getPromotedIntegerType(BestType);
11807 BestPromotionType = BestType;
11808 // We don't need to set BestWidth, because BestType is going to be the type
11809 // of the enumerators, but we do anyway because otherwise some compilers
11810 // warn that it might be used uninitialized.
11811 BestWidth = CharWidth;
11813 else if (NumNegativeBits) {
11814 // If there is a negative value, figure out the smallest integer type (of
11815 // int/long/longlong) that fits.
11816 // If it's packed, check also if it fits a char or a short.
11817 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
11818 BestType = Context.SignedCharTy;
11819 BestWidth = CharWidth;
11820 } else if (Packed && NumNegativeBits <= ShortWidth &&
11821 NumPositiveBits < ShortWidth) {
11822 BestType = Context.ShortTy;
11823 BestWidth = ShortWidth;
11824 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
11825 BestType = Context.IntTy;
11826 BestWidth = IntWidth;
11828 BestWidth = Context.getTargetInfo().getLongWidth();
11830 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
11831 BestType = Context.LongTy;
11833 BestWidth = Context.getTargetInfo().getLongLongWidth();
11835 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
11836 Diag(Enum->getLocation(), diag::warn_enum_too_large);
11837 BestType = Context.LongLongTy;
11840 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
11842 // If there is no negative value, figure out the smallest type that fits
11843 // all of the enumerator values.
11844 // If it's packed, check also if it fits a char or a short.
11845 if (Packed && NumPositiveBits <= CharWidth) {
11846 BestType = Context.UnsignedCharTy;
11847 BestPromotionType = Context.IntTy;
11848 BestWidth = CharWidth;
11849 } else if (Packed && NumPositiveBits <= ShortWidth) {
11850 BestType = Context.UnsignedShortTy;
11851 BestPromotionType = Context.IntTy;
11852 BestWidth = ShortWidth;
11853 } else if (NumPositiveBits <= IntWidth) {
11854 BestType = Context.UnsignedIntTy;
11855 BestWidth = IntWidth;
11857 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
11858 ? Context.UnsignedIntTy : Context.IntTy;
11859 } else if (NumPositiveBits <=
11860 (BestWidth = Context.getTargetInfo().getLongWidth())) {
11861 BestType = Context.UnsignedLongTy;
11863 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
11864 ? Context.UnsignedLongTy : Context.LongTy;
11866 BestWidth = Context.getTargetInfo().getLongLongWidth();
11867 assert(NumPositiveBits <= BestWidth &&
11868 "How could an initializer get larger than ULL?");
11869 BestType = Context.UnsignedLongLongTy;
11871 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
11872 ? Context.UnsignedLongLongTy : Context.LongLongTy;
11876 // Loop over all of the enumerator constants, changing their types to match
11877 // the type of the enum if needed.
11878 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
11879 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
11880 if (!ECD) continue; // Already issued a diagnostic.
11882 // Standard C says the enumerators have int type, but we allow, as an
11883 // extension, the enumerators to be larger than int size. If each
11884 // enumerator value fits in an int, type it as an int, otherwise type it the
11885 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
11886 // that X has type 'int', not 'unsigned'.
11888 // Determine whether the value fits into an int.
11889 llvm::APSInt InitVal = ECD->getInitVal();
11891 // If it fits into an integer type, force it. Otherwise force it to match
11892 // the enum decl type.
11896 if (!getLangOpts().CPlusPlus &&
11897 !Enum->isFixed() &&
11898 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
11899 NewTy = Context.IntTy;
11900 NewWidth = IntWidth;
11902 } else if (ECD->getType() == BestType) {
11903 // Already the right type!
11904 if (getLangOpts().CPlusPlus)
11905 // C++ [dcl.enum]p4: Following the closing brace of an
11906 // enum-specifier, each enumerator has the type of its
11908 ECD->setType(EnumType);
11912 NewWidth = BestWidth;
11913 NewSign = BestType->isSignedIntegerOrEnumerationType();
11916 // Adjust the APSInt value.
11917 InitVal = InitVal.extOrTrunc(NewWidth);
11918 InitVal.setIsSigned(NewSign);
11919 ECD->setInitVal(InitVal);
11921 // Adjust the Expr initializer and type.
11922 if (ECD->getInitExpr() &&
11923 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
11924 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
11926 ECD->getInitExpr(),
11929 if (getLangOpts().CPlusPlus)
11930 // C++ [dcl.enum]p4: Following the closing brace of an
11931 // enum-specifier, each enumerator has the type of its
11933 ECD->setType(EnumType);
11935 ECD->setType(NewTy);
11938 Enum->completeDefinition(BestType, BestPromotionType,
11939 NumPositiveBits, NumNegativeBits);
11941 // If we're declaring a function, ensure this decl isn't forgotten about -
11942 // it needs to go into the function scope.
11943 if (InFunctionDeclarator)
11944 DeclsInPrototypeScope.push_back(Enum);
11946 CheckForDuplicateEnumValues(*this, Elements, Enum, EnumType);
11948 // Now that the enum type is defined, ensure it's not been underaligned.
11949 if (Enum->hasAttrs())
11950 CheckAlignasUnderalignment(Enum);
11953 Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
11954 SourceLocation StartLoc,
11955 SourceLocation EndLoc) {
11956 StringLiteral *AsmString = cast<StringLiteral>(expr);
11958 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
11959 AsmString, StartLoc,
11961 CurContext->addDecl(New);
11965 DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc,
11966 SourceLocation ImportLoc,
11967 ModuleIdPath Path) {
11968 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path,
11969 Module::AllVisible,
11970 /*IsIncludeDirective=*/false);
11974 SmallVector<SourceLocation, 2> IdentifierLocs;
11975 Module *ModCheck = Mod;
11976 for (unsigned I = 0, N = Path.size(); I != N; ++I) {
11977 // If we've run out of module parents, just drop the remaining identifiers.
11978 // We need the length to be consistent.
11981 ModCheck = ModCheck->Parent;
11983 IdentifierLocs.push_back(Path[I].second);
11986 ImportDecl *Import = ImportDecl::Create(Context,
11987 Context.getTranslationUnitDecl(),
11988 AtLoc.isValid()? AtLoc : ImportLoc,
11989 Mod, IdentifierLocs);
11990 Context.getTranslationUnitDecl()->addDecl(Import);
11994 void Sema::createImplicitModuleImport(SourceLocation Loc, Module *Mod) {
11995 // Create the implicit import declaration.
11996 TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
11997 ImportDecl *ImportD = ImportDecl::CreateImplicit(getASTContext(), TU,
11999 TU->addDecl(ImportD);
12000 Consumer.HandleImplicitImportDecl(ImportD);
12002 // Make the module visible.
12003 PP.getModuleLoader().makeModuleVisible(Mod, Module::AllVisible, Loc,
12004 /*Complain=*/false);
12007 void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
12008 IdentifierInfo* AliasName,
12009 SourceLocation PragmaLoc,
12010 SourceLocation NameLoc,
12011 SourceLocation AliasNameLoc) {
12012 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
12013 LookupOrdinaryName);
12014 AsmLabelAttr *Attr =
12015 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName());
12018 PrevDecl->addAttr(Attr);
12020 (void)ExtnameUndeclaredIdentifiers.insert(
12021 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr));
12024 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
12025 SourceLocation PragmaLoc,
12026 SourceLocation NameLoc) {
12027 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
12030 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
12032 (void)WeakUndeclaredIdentifiers.insert(
12033 std::pair<IdentifierInfo*,WeakInfo>
12034 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
12038 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
12039 IdentifierInfo* AliasName,
12040 SourceLocation PragmaLoc,
12041 SourceLocation NameLoc,
12042 SourceLocation AliasNameLoc) {
12043 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
12044 LookupOrdinaryName);
12045 WeakInfo W = WeakInfo(Name, NameLoc);
12048 if (!PrevDecl->hasAttr<AliasAttr>())
12049 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
12050 DeclApplyPragmaWeak(TUScope, ND, W);
12052 (void)WeakUndeclaredIdentifiers.insert(
12053 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
12057 Decl *Sema::getObjCDeclContext() const {
12058 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));
12061 AvailabilityResult Sema::getCurContextAvailability() const {
12062 const Decl *D = cast<Decl>(getCurObjCLexicalContext());
12063 return D->getAvailability();