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 "clang/Sema/Initialization.h"
16 #include "clang/Sema/Lookup.h"
17 #include "clang/Sema/CXXFieldCollector.h"
18 #include "clang/Sema/Scope.h"
19 #include "clang/Sema/ScopeInfo.h"
20 #include "TypeLocBuilder.h"
21 #include "clang/AST/APValue.h"
22 #include "clang/AST/ASTConsumer.h"
23 #include "clang/AST/ASTContext.h"
24 #include "clang/AST/CXXInheritance.h"
25 #include "clang/AST/DeclCXX.h"
26 #include "clang/AST/DeclObjC.h"
27 #include "clang/AST/DeclTemplate.h"
28 #include "clang/AST/EvaluatedExprVisitor.h"
29 #include "clang/AST/ExprCXX.h"
30 #include "clang/AST/StmtCXX.h"
31 #include "clang/AST/CharUnits.h"
32 #include "clang/Sema/DeclSpec.h"
33 #include "clang/Sema/ParsedTemplate.h"
34 #include "clang/Parse/ParseDiagnostic.h"
35 #include "clang/Basic/PartialDiagnostic.h"
36 #include "clang/Sema/DelayedDiagnostic.h"
37 #include "clang/Basic/SourceManager.h"
38 #include "clang/Basic/TargetInfo.h"
39 // FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
40 #include "clang/Lex/Preprocessor.h"
41 #include "clang/Lex/HeaderSearch.h"
42 #include "clang/Lex/ModuleLoader.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));
59 /// \brief If the identifier refers to a type name within this scope,
60 /// return the declaration of that type.
62 /// This routine performs ordinary name lookup of the identifier II
63 /// within the given scope, with optional C++ scope specifier SS, to
64 /// determine whether the name refers to a type. If so, returns an
65 /// opaque pointer (actually a QualType) corresponding to that
66 /// type. Otherwise, returns NULL.
68 /// If name lookup results in an ambiguity, this routine will complain
69 /// and then return NULL.
70 ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
71 Scope *S, CXXScopeSpec *SS,
72 bool isClassName, bool HasTrailingDot,
73 ParsedType ObjectTypePtr,
74 bool WantNontrivialTypeSourceInfo,
75 IdentifierInfo **CorrectedII) {
76 // Determine where we will perform name lookup.
77 DeclContext *LookupCtx = 0;
79 QualType ObjectType = ObjectTypePtr.get();
80 if (ObjectType->isRecordType())
81 LookupCtx = computeDeclContext(ObjectType);
82 } else if (SS && SS->isNotEmpty()) {
83 LookupCtx = computeDeclContext(*SS, false);
86 if (isDependentScopeSpecifier(*SS)) {
88 // A qualified-id that refers to a type and in which the
89 // nested-name-specifier depends on a template-parameter (14.6.2)
90 // shall be prefixed by the keyword typename to indicate that the
91 // qualified-id denotes a type, forming an
92 // elaborated-type-specifier (7.1.5.3).
94 // We therefore do not perform any name lookup if the result would
95 // refer to a member of an unknown specialization.
99 // We know from the grammar that this name refers to a type,
100 // so build a dependent node to describe the type.
101 if (WantNontrivialTypeSourceInfo)
102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
109 return ParsedType::make(T);
115 if (!LookupCtx->isDependentContext() &&
116 RequireCompleteDeclContext(*SS, LookupCtx))
120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
121 // lookup for class-names.
122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
124 LookupResult Result(*this, &II, NameLoc, Kind);
126 // Perform "qualified" name lookup into the declaration context we
127 // computed, which is either the type of the base of a member access
128 // expression or the declaration context associated with a prior
129 // nested-name-specifier.
130 LookupQualifiedName(Result, LookupCtx);
132 if (ObjectTypePtr && Result.empty()) {
133 // C++ [basic.lookup.classref]p3:
134 // If the unqualified-id is ~type-name, the type-name is looked up
135 // in the context of the entire postfix-expression. If the type T of
136 // the object expression is of a class type C, the type-name is also
137 // looked up in the scope of class C. At least one of the lookups shall
138 // find a name that refers to (possibly cv-qualified) T.
139 LookupName(Result, S);
142 // Perform unqualified name lookup.
143 LookupName(Result, S);
146 NamedDecl *IIDecl = 0;
147 switch (Result.getResultKind()) {
148 case LookupResult::NotFound:
149 case LookupResult::NotFoundInCurrentInstantiation:
151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(),
152 Kind, S, SS, 0, false,
154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
156 bool MemberOfUnknownSpecialization;
157 UnqualifiedId TemplateName;
158 TemplateName.setIdentifier(NewII, NameLoc);
159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
160 CXXScopeSpec NewSS, *NewSSPtr = SS;
162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
165 if (Correction && (NNS || NewII != &II) &&
166 // Ignore a correction to a template type as the to-be-corrected
167 // identifier is not a template (typo correction for template names
168 // is handled elsewhere).
169 !(getLangOptions().CPlusPlus && NewSSPtr &&
170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(),
171 false, Template, MemberOfUnknownSpecialization))) {
172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
173 isClassName, HasTrailingDot, ObjectTypePtr,
174 WantNontrivialTypeSourceInfo);
176 std::string CorrectedStr(Correction.getAsString(getLangOptions()));
177 std::string CorrectedQuotedStr(
178 Correction.getQuoted(getLangOptions()));
179 Diag(NameLoc, diag::err_unknown_typename_suggest)
180 << Result.getLookupName() << CorrectedQuotedStr
181 << FixItHint::CreateReplacement(SourceRange(NameLoc),
183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl())
184 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
185 << CorrectedQuotedStr;
188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
189 *CorrectedII = NewII;
194 // If typo correction failed or was not performed, fall through
195 case LookupResult::FoundOverloaded:
196 case LookupResult::FoundUnresolvedValue:
197 Result.suppressDiagnostics();
200 case LookupResult::Ambiguous:
201 // Recover from type-hiding ambiguities by hiding the type. We'll
202 // do the lookup again when looking for an object, and we can
203 // diagnose the error then. If we don't do this, then the error
204 // about hiding the type will be immediately followed by an error
205 // that only makes sense if the identifier was treated like a type.
206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
207 Result.suppressDiagnostics();
211 // Look to see if we have a type anywhere in the list of results.
212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
213 Res != ResEnd; ++Res) {
214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
216 (*Res)->getLocation().getRawEncoding() <
217 IIDecl->getLocation().getRawEncoding())
223 // None of the entities we found is a type, so there is no way
224 // to even assume that the result is a type. In this case, don't
225 // complain about the ambiguity. The parser will either try to
226 // perform this lookup again (e.g., as an object name), which
227 // will produce the ambiguity, or will complain that it expected
229 Result.suppressDiagnostics();
233 // We found a type within the ambiguous lookup; diagnose the
234 // ambiguity and then return that type. This might be the right
235 // answer, or it might not be, but it suppresses any attempt to
236 // perform the name lookup again.
239 case LookupResult::Found:
240 IIDecl = Result.getFoundDecl();
244 assert(IIDecl && "Didn't find decl");
247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
248 DiagnoseUseOfDecl(IIDecl, NameLoc);
251 T = Context.getTypeDeclType(TD);
253 if (SS && SS->isNotEmpty()) {
254 if (WantNontrivialTypeSourceInfo) {
255 // Construct a type with type-source information.
256 TypeLocBuilder Builder;
257 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
259 T = getElaboratedType(ETK_None, *SS, T);
260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
261 ElabTL.setKeywordLoc(SourceLocation());
262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
265 T = getElaboratedType(ETK_None, *SS, T);
268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
269 (void)DiagnoseUseOfDecl(IDecl, NameLoc);
271 T = Context.getObjCInterfaceType(IDecl);
275 // If it's not plausibly a type, suppress diagnostics.
276 Result.suppressDiagnostics();
279 return ParsedType::make(T);
282 /// isTagName() - This method is called *for error recovery purposes only*
283 /// to determine if the specified name is a valid tag name ("struct foo"). If
284 /// so, this returns the TST for the tag corresponding to it (TST_enum,
285 /// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
286 /// where the user forgot to specify the tag.
287 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
288 // Do a tag name lookup in this scope.
289 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
290 LookupName(R, S, false);
291 R.suppressDiagnostics();
292 if (R.getResultKind() == LookupResult::Found)
293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
294 switch (TD->getTagKind()) {
295 default: return DeclSpec::TST_unspecified;
296 case TTK_Struct: return DeclSpec::TST_struct;
297 case TTK_Union: return DeclSpec::TST_union;
298 case TTK_Class: return DeclSpec::TST_class;
299 case TTK_Enum: return DeclSpec::TST_enum;
303 return DeclSpec::TST_unspecified;
306 /// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
307 /// if a CXXScopeSpec's type is equal to the type of one of the base classes
308 /// then downgrade the missing typename error to a warning.
309 /// This is needed for MSVC compatibility; Example:
311 /// template<class T> class A {
313 /// typedef int TYPE;
315 /// template<class T> class B : public A<T> {
317 /// A<T>::TYPE a; // no typename required because A<T> is a base class.
320 bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
321 if (CurContext->isRecord()) {
322 const Type *Ty = SS->getScopeRep()->getAsType();
324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base)
327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType()))
329 return S->isFunctionPrototypeScope();
331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
334 bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II,
335 SourceLocation IILoc,
338 ParsedType &SuggestedType) {
339 // We don't have anything to suggest (yet).
340 SuggestedType = ParsedType();
342 // There may have been a typo in the name of the type. Look up typo
343 // results, in case we have something that we can suggest.
344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc),
345 LookupOrdinaryName, S, SS, NULL,
347 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
350 if (Corrected.isKeyword()) {
351 // We corrected to a keyword.
352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it.
353 Diag(IILoc, diag::err_unknown_typename_suggest)
354 << &II << CorrectedQuotedStr;
357 NamedDecl *Result = Corrected.getCorrectionDecl();
358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) &&
359 !Result->isInvalidDecl()) {
360 // We found a similarly-named type or interface; suggest that.
361 if (!SS || !SS->isSet())
362 Diag(IILoc, diag::err_unknown_typename_suggest)
363 << &II << CorrectedQuotedStr
364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
365 else if (DeclContext *DC = computeDeclContext(*SS, false))
366 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
367 << &II << DC << CorrectedQuotedStr << SS->getRange()
368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
370 llvm_unreachable("could not have corrected a typo here");
372 Diag(Result->getLocation(), diag::note_previous_decl)
373 << CorrectedQuotedStr;
375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS,
376 false, false, ParsedType(),
377 /*NonTrivialTypeSourceInfo=*/true);
383 if (getLangOptions().CPlusPlus) {
384 // See if II is a class template that the user forgot to pass arguments to.
386 Name.setIdentifier(&II, IILoc);
387 CXXScopeSpec EmptySS;
388 TemplateTy TemplateResult;
389 bool MemberOfUnknownSpecialization;
390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
391 Name, ParsedType(), true, TemplateResult,
392 MemberOfUnknownSpecialization) == TNK_Type_template) {
393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
394 Diag(IILoc, diag::err_template_missing_args) << TplName;
395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
396 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
397 << TplDecl->getTemplateParameters()->getSourceRange();
403 // FIXME: Should we move the logic that tries to recover from a missing tag
404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
406 if (!SS || (!SS->isSet() && !SS->isInvalid()))
407 Diag(IILoc, diag::err_unknown_typename) << &II;
408 else if (DeclContext *DC = computeDeclContext(*SS, false))
409 Diag(IILoc, diag::err_typename_nested_not_found)
410 << &II << DC << SS->getRange();
411 else if (isDependentScopeSpecifier(*SS)) {
412 unsigned DiagID = diag::err_typename_missing;
413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S))
414 DiagID = diag::warn_typename_missing;
416 Diag(SS->getRange().getBegin(), DiagID)
417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName()
418 << SourceRange(SS->getRange().getBegin(), IILoc)
419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get();
422 assert(SS && SS->isInvalid() &&
423 "Invalid scope specifier has already been diagnosed");
429 /// \brief Determine whether the given result set contains either a type name
431 static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus &&
433 NextToken.is(tok::less);
435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
439 if (CheckTemplate && isa<TemplateDecl>(*I))
446 Sema::NameClassification Sema::ClassifyName(Scope *S,
448 IdentifierInfo *&Name,
449 SourceLocation NameLoc,
450 const Token &NextToken) {
451 DeclarationNameInfo NameInfo(Name, NameLoc);
452 ObjCMethodDecl *CurMethod = getCurMethodDecl();
454 if (NextToken.is(tok::coloncolon)) {
455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(),
456 QualType(), false, SS, 0, false);
460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
461 LookupParsedName(Result, S, &SS, !CurMethod);
463 // Perform lookup for Objective-C instance variables (including automatically
464 // synthesized instance variables), if we're in an Objective-C method.
465 // FIXME: This lookup really, really needs to be folded in to the normal
466 // unqualified lookup mechanism.
467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
468 ExprResult E = LookupInObjCMethod(Result, S, Name, true);
469 if (E.get() || E.isInvalid())
473 bool SecondTry = false;
474 bool IsFilteredTemplateName = false;
477 switch (Result.getResultKind()) {
478 case LookupResult::NotFound:
479 // If an unqualified-id is followed by a '(', then we have a function
481 if (!SS.isSet() && NextToken.is(tok::l_paren)) {
482 // In C++, this is an ADL-only call.
484 if (getLangOptions().CPlusPlus)
485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
488 // If the expression that precedes the parenthesized argument list in a
489 // function call consists solely of an identifier, and if no
490 // declaration is visible for this identifier, the identifier is
491 // implicitly declared exactly as if, in the innermost block containing
492 // the function call, the declaration
494 // extern int identifier ();
498 // We also allow this in C99 as an extension.
499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
501 Result.resolveKind();
502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
506 // In C, we first see whether there is a tag type by the same name, in
507 // which case it's likely that the user just forget to write "enum",
508 // "struct", or "union".
509 if (!getLangOptions().CPlusPlus && !SecondTry) {
510 Result.clear(LookupTagName);
511 LookupParsedName(Result, S, &SS);
512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) {
513 const char *TagName = 0;
514 const char *FixItTagName = 0;
515 switch (Tag->getTagKind()) {
518 FixItTagName = "class ";
523 FixItTagName = "enum ";
528 FixItTagName = "struct ";
533 FixItTagName = "union ";
537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
538 << Name << TagName << getLangOptions().CPlusPlus
539 << FixItHint::CreateInsertion(NameLoc, FixItTagName);
543 Result.clear(LookupOrdinaryName);
546 // Perform typo correction to determine if there is another name that is
547 // close to this name.
550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
551 Result.getLookupKind(), S, &SS)) {
552 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
553 unsigned QualifiedDiag = diag::err_no_member_suggest;
554 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
555 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
557 NamedDecl *FirstDecl = Corrected.getCorrectionDecl();
558 NamedDecl *UnderlyingFirstDecl
559 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0;
560 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) &&
561 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
562 UnqualifiedDiag = diag::err_no_template_suggest;
563 QualifiedDiag = diag::err_no_member_template_suggest;
564 } else if (UnderlyingFirstDecl &&
565 (isa<TypeDecl>(UnderlyingFirstDecl) ||
566 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
567 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
568 UnqualifiedDiag = diag::err_unknown_typename_suggest;
569 QualifiedDiag = diag::err_unknown_nested_typename_suggest;
573 Diag(NameLoc, UnqualifiedDiag)
574 << Name << CorrectedQuotedStr
575 << FixItHint::CreateReplacement(NameLoc, CorrectedStr);
577 Diag(NameLoc, QualifiedDiag)
578 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
580 << FixItHint::CreateReplacement(NameLoc, CorrectedStr);
582 // Update the name, so that the caller has the new name.
583 Name = Corrected.getCorrectionAsIdentifierInfo();
585 // Also update the LookupResult...
586 // FIXME: This should probably go away at some point
588 Result.setLookupName(Corrected.getCorrection());
589 if (FirstDecl) Result.addDecl(FirstDecl);
591 // Typo correction corrected to a keyword.
592 if (Corrected.isKeyword())
593 return Corrected.getCorrectionAsIdentifierInfo();
596 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
597 << CorrectedQuotedStr;
599 // If we found an Objective-C instance variable, let
600 // LookupInObjCMethod build the appropriate expression to
601 // reference the ivar.
602 // FIXME: This is a gross hack.
603 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
605 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
613 // We failed to correct; just fall through and let the parser deal with it.
614 Result.suppressDiagnostics();
615 return NameClassification::Unknown();
617 case LookupResult::NotFoundInCurrentInstantiation:
618 // We performed name lookup into the current instantiation, and there were
619 // dependent bases, so we treat this result the same way as any other
620 // dependent nested-name-specifier.
623 // A name used in a template declaration or definition and that is
624 // dependent on a template-parameter is assumed not to name a type
625 // unless the applicable name lookup finds a type name or the name is
626 // qualified by the keyword typename.
628 // FIXME: If the next token is '<', we might want to ask the parser to
629 // perform some heroics to see if we actually have a
630 // template-argument-list, which would indicate a missing 'template'
632 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0);
634 case LookupResult::Found:
635 case LookupResult::FoundOverloaded:
636 case LookupResult::FoundUnresolvedValue:
639 case LookupResult::Ambiguous:
640 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) &&
641 hasAnyAcceptableTemplateNames(Result)) {
642 // C++ [temp.local]p3:
643 // A lookup that finds an injected-class-name (10.2) can result in an
644 // ambiguity in certain cases (for example, if it is found in more than
645 // one base class). If all of the injected-class-names that are found
646 // refer to specializations of the same class template, and if the name
647 // is followed by a template-argument-list, the reference refers to the
648 // class template itself and not a specialization thereof, and is not
651 // This filtering can make an ambiguous result into an unambiguous one,
652 // so try again after filtering out template names.
653 FilterAcceptableTemplateNames(Result);
654 if (!Result.isAmbiguous()) {
655 IsFilteredTemplateName = true;
660 // Diagnose the ambiguity and return an error.
661 return NameClassification::Error();
664 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) &&
665 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
666 // C++ [temp.names]p3:
667 // After name lookup (3.4) finds that a name is a template-name or that
668 // an operator-function-id or a literal- operator-id refers to a set of
669 // overloaded functions any member of which is a function template if
670 // this is followed by a <, the < is always taken as the delimiter of a
671 // template-argument-list and never as the less-than operator.
672 if (!IsFilteredTemplateName)
673 FilterAcceptableTemplateNames(Result);
675 if (!Result.empty()) {
676 bool IsFunctionTemplate;
677 TemplateName Template;
678 if (Result.end() - Result.begin() > 1) {
679 IsFunctionTemplate = true;
680 Template = Context.getOverloadedTemplateName(Result.begin(),
684 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
685 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
687 if (SS.isSet() && !SS.isInvalid())
688 Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
689 /*TemplateKeyword=*/false,
692 Template = TemplateName(TD);
695 if (IsFunctionTemplate) {
696 // Function templates always go through overload resolution, at which
697 // point we'll perform the various checks (e.g., accessibility) we need
698 // to based on which function we selected.
699 Result.suppressDiagnostics();
701 return NameClassification::FunctionTemplate(Template);
704 return NameClassification::TypeTemplate(Template);
708 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
709 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
710 DiagnoseUseOfDecl(Type, NameLoc);
711 QualType T = Context.getTypeDeclType(Type);
712 return ParsedType::make(T);
715 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
717 // FIXME: It's unfortunate that we don't have a Type node for handling this.
718 if (ObjCCompatibleAliasDecl *Alias
719 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
720 Class = Alias->getClassInterface();
724 DiagnoseUseOfDecl(Class, NameLoc);
726 if (NextToken.is(tok::period)) {
727 // Interface. <something> is parsed as a property reference expression.
728 // Just return "unknown" as a fall-through for now.
729 Result.suppressDiagnostics();
730 return NameClassification::Unknown();
733 QualType T = Context.getObjCInterfaceType(Class);
734 return ParsedType::make(T);
737 if (!Result.empty() && (*Result.begin())->isCXXClassMember())
738 return BuildPossibleImplicitMemberExpr(SS, Result, 0);
740 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
741 return BuildDeclarationNameExpr(SS, Result, ADL);
744 // Determines the context to return to after temporarily entering a
745 // context. This depends in an unnecessarily complicated way on the
746 // exact ordering of callbacks from the parser.
747 DeclContext *Sema::getContainingDC(DeclContext *DC) {
749 // Functions defined inline within classes aren't parsed until we've
750 // finished parsing the top-level class, so the top-level class is
751 // the context we'll need to return to.
752 if (isa<FunctionDecl>(DC)) {
753 DC = DC->getLexicalParent();
755 // A function not defined within a class will always return to its
757 if (!isa<CXXRecordDecl>(DC))
760 // A C++ inline method/friend is parsed *after* the topmost class
761 // it was declared in is fully parsed ("complete"); the topmost
762 // class is the context we need to return to.
763 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
766 // Return the declaration context of the topmost class the inline method is
771 return DC->getLexicalParent();
774 void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
775 assert(getContainingDC(DC) == CurContext &&
776 "The next DeclContext should be lexically contained in the current one.");
781 void Sema::PopDeclContext() {
782 assert(CurContext && "DeclContext imbalance!");
784 CurContext = getContainingDC(CurContext);
785 assert(CurContext && "Popped translation unit!");
788 /// EnterDeclaratorContext - Used when we must lookup names in the context
789 /// of a declarator's nested name specifier.
791 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
792 // C++0x [basic.lookup.unqual]p13:
793 // A name used in the definition of a static data member of class
794 // X (after the qualified-id of the static member) is looked up as
795 // if the name was used in a member function of X.
796 // C++0x [basic.lookup.unqual]p14:
797 // If a variable member of a namespace is defined outside of the
798 // scope of its namespace then any name used in the definition of
799 // the variable member (after the declarator-id) is looked up as
800 // if the definition of the variable member occurred in its
802 // Both of these imply that we should push a scope whose context
803 // is the semantic context of the declaration. We can't use
804 // PushDeclContext here because that context is not necessarily
805 // lexically contained in the current context. Fortunately,
806 // the containing scope should have the appropriate information.
808 assert(!S->getEntity() && "scope already has entity");
811 Scope *Ancestor = S->getParent();
812 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
813 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
820 void Sema::ExitDeclaratorContext(Scope *S) {
821 assert(S->getEntity() == CurContext && "Context imbalance!");
823 // Switch back to the lexical context. The safety of this is
824 // enforced by an assert in EnterDeclaratorContext.
825 Scope *Ancestor = S->getParent();
826 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
827 CurContext = (DeclContext*) Ancestor->getEntity();
829 // We don't need to do anything with the scope, which is going to
834 void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
835 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
836 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) {
837 // We assume that the caller has already called
838 // ActOnReenterTemplateScope
839 FD = TFD->getTemplatedDecl();
844 PushDeclContext(S, FD);
845 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
846 ParmVarDecl *Param = FD->getParamDecl(P);
847 // If the parameter has an identifier, then add it to the scope
848 if (Param->getIdentifier()) {
850 IdResolver.AddDecl(Param);
856 /// \brief Determine whether we allow overloading of the function
857 /// PrevDecl with another declaration.
859 /// This routine determines whether overloading is possible, not
860 /// whether some new function is actually an overload. It will return
861 /// true in C++ (where we can always provide overloads) or, as an
862 /// extension, in C when the previous function is already an
863 /// overloaded function declaration or has the "overloadable"
865 static bool AllowOverloadingOfFunction(LookupResult &Previous,
866 ASTContext &Context) {
867 if (Context.getLangOptions().CPlusPlus)
870 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
873 return (Previous.getResultKind() == LookupResult::Found
874 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
877 /// Add this decl to the scope shadowed decl chains.
878 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
879 // Move up the scope chain until we find the nearest enclosing
880 // non-transparent context. The declaration will be introduced into this
882 while (S->getEntity() &&
883 ((DeclContext *)S->getEntity())->isTransparentContext())
886 // Add scoped declarations into their context, so that they can be
887 // found later. Declarations without a context won't be inserted
890 CurContext->addDecl(D);
892 // Out-of-line definitions shouldn't be pushed into scope in C++.
893 // Out-of-line variable and function definitions shouldn't even in C.
894 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
896 !D->getDeclContext()->getRedeclContext()->Equals(
897 D->getLexicalDeclContext()->getRedeclContext()))
900 // Template instantiations should also not be pushed into scope.
901 if (isa<FunctionDecl>(D) &&
902 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
905 // If this replaces anything in the current scope,
906 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
907 IEnd = IdResolver.end();
908 for (; I != IEnd; ++I) {
909 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
911 IdResolver.RemoveDecl(*I);
913 // Should only need to replace one decl.
920 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
921 // Implicitly-generated labels may end up getting generated in an order that
922 // isn't strictly lexical, which breaks name lookup. Be careful to insert
923 // the label at the appropriate place in the identifier chain.
924 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
925 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
926 if (IDC == CurContext) {
927 if (!S->isDeclScope(*I))
929 } else if (IDC->Encloses(CurContext))
933 IdResolver.InsertDeclAfter(I, D);
935 IdResolver.AddDecl(D);
939 bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S,
940 bool ExplicitInstantiationOrSpecialization) {
941 return IdResolver.isDeclInScope(D, Ctx, Context, S,
942 ExplicitInstantiationOrSpecialization);
945 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
946 DeclContext *TargetDC = DC->getPrimaryContext();
948 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
949 if (ScopeDC->getPrimaryContext() == TargetDC)
951 } while ((S = S->getParent()));
956 static bool isOutOfScopePreviousDeclaration(NamedDecl *,
960 /// Filters out lookup results that don't fall within the given scope
961 /// as determined by isDeclInScope.
962 void Sema::FilterLookupForScope(LookupResult &R,
963 DeclContext *Ctx, Scope *S,
964 bool ConsiderLinkage,
965 bool ExplicitInstantiationOrSpecialization) {
966 LookupResult::Filter F = R.makeFilter();
967 while (F.hasNext()) {
968 NamedDecl *D = F.next();
970 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization))
973 if (ConsiderLinkage &&
974 isOutOfScopePreviousDeclaration(D, Ctx, Context))
983 static bool isUsingDecl(NamedDecl *D) {
984 return isa<UsingShadowDecl>(D) ||
985 isa<UnresolvedUsingTypenameDecl>(D) ||
986 isa<UnresolvedUsingValueDecl>(D);
989 /// Removes using shadow declarations from the lookup results.
990 static void RemoveUsingDecls(LookupResult &R) {
991 LookupResult::Filter F = R.makeFilter();
993 if (isUsingDecl(F.next()))
999 /// \brief Check for this common pattern:
1002 /// S(const S&); // DO NOT IMPLEMENT
1003 /// void operator=(const S&); // DO NOT IMPLEMENT
1006 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
1007 // FIXME: Should check for private access too but access is set after we get
1009 if (D->doesThisDeclarationHaveABody())
1012 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
1013 return CD->isCopyConstructor();
1014 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1015 return Method->isCopyAssignmentOperator();
1019 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
1022 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
1025 // Ignore class templates.
1026 if (D->getDeclContext()->isDependentContext() ||
1027 D->getLexicalDeclContext()->isDependentContext())
1030 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1031 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1034 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
1035 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
1038 // 'static inline' functions are used in headers; don't warn.
1039 if (FD->getStorageClass() == SC_Static &&
1040 FD->isInlineSpecified())
1044 if (FD->doesThisDeclarationHaveABody() &&
1045 Context.DeclMustBeEmitted(FD))
1047 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1048 if (!VD->isFileVarDecl() ||
1049 VD->getType().isConstant(Context) ||
1050 Context.DeclMustBeEmitted(VD))
1053 if (VD->isStaticDataMember() &&
1054 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1061 // Only warn for unused decls internal to the translation unit.
1062 if (D->getLinkage() == ExternalLinkage)
1068 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
1072 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1073 const FunctionDecl *First = FD->getFirstDeclaration();
1074 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1075 return; // First should already be in the vector.
1078 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1079 const VarDecl *First = VD->getFirstDeclaration();
1080 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1081 return; // First should already be in the vector.
1084 if (ShouldWarnIfUnusedFileScopedDecl(D))
1085 UnusedFileScopedDecls.push_back(D);
1088 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
1089 if (D->isInvalidDecl())
1092 if (D->isUsed() || D->hasAttr<UnusedAttr>())
1095 if (isa<LabelDecl>(D))
1098 // White-list anything that isn't a local variable.
1099 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
1100 !D->getDeclContext()->isFunctionOrMethod())
1103 // Types of valid local variables should be complete, so this should succeed.
1104 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
1106 // White-list anything with an __attribute__((unused)) type.
1107 QualType Ty = VD->getType();
1109 // Only look at the outermost level of typedef.
1110 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) {
1111 if (TT->getDecl()->hasAttr<UnusedAttr>())
1115 // If we failed to complete the type for some reason, or if the type is
1116 // dependent, don't diagnose the variable.
1117 if (Ty->isIncompleteType() || Ty->isDependentType())
1120 if (const TagType *TT = Ty->getAs<TagType>()) {
1121 const TagDecl *Tag = TT->getDecl();
1122 if (Tag->hasAttr<UnusedAttr>())
1125 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
1126 // FIXME: Checking for the presence of a user-declared constructor
1127 // isn't completely accurate; we'd prefer to check that the initializer
1128 // has no side effects.
1129 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor())
1134 // TODO: __attribute__((unused)) templates?
1140 static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
1142 if (isa<LabelDecl>(D)) {
1143 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
1144 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true);
1145 if (AfterColon.isInvalid())
1147 Hint = FixItHint::CreateRemoval(CharSourceRange::
1148 getCharRange(D->getLocStart(), AfterColon));
1153 /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
1154 /// unless they are marked attr(unused).
1155 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
1157 if (!ShouldDiagnoseUnusedDecl(D))
1160 GenerateFixForUnusedDecl(D, Context, Hint);
1163 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
1164 DiagID = diag::warn_unused_exception_param;
1165 else if (isa<LabelDecl>(D))
1166 DiagID = diag::warn_unused_label;
1168 DiagID = diag::warn_unused_variable;
1170 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
1173 static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
1174 // Verify that we have no forward references left. If so, there was a goto
1175 // or address of a label taken, but no definition of it. Label fwd
1176 // definitions are indicated with a null substmt.
1177 if (L->getStmt() == 0)
1178 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
1181 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
1182 if (S->decl_empty()) return;
1183 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
1184 "Scope shouldn't contain decls!");
1186 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
1189 assert(TmpD && "This decl didn't get pushed??");
1191 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
1192 NamedDecl *D = cast<NamedDecl>(TmpD);
1194 if (!D->getDeclName()) continue;
1196 // Diagnose unused variables in this scope.
1197 if (!S->hasErrorOccurred())
1198 DiagnoseUnusedDecl(D);
1200 // If this was a forward reference to a label, verify it was defined.
1201 if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
1202 CheckPoppedLabel(LD, *this);
1204 // Remove this name from our lexical scope.
1205 IdResolver.RemoveDecl(D);
1209 /// \brief Look for an Objective-C class in the translation unit.
1211 /// \param Id The name of the Objective-C class we're looking for. If
1212 /// typo-correction fixes this name, the Id will be updated
1213 /// to the fixed name.
1215 /// \param IdLoc The location of the name in the translation unit.
1217 /// \param TypoCorrection If true, this routine will attempt typo correction
1218 /// if there is no class with the given name.
1220 /// \returns The declaration of the named Objective-C class, or NULL if the
1221 /// class could not be found.
1222 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
1223 SourceLocation IdLoc,
1224 bool DoTypoCorrection) {
1225 // The third "scope" argument is 0 since we aren't enabling lazy built-in
1226 // creation from this context.
1227 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
1229 if (!IDecl && DoTypoCorrection) {
1230 // Perform typo correction at the given location, but only if we
1231 // find an Objective-C class name.
1233 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName,
1234 TUScope, NULL, NULL, false, CTC_NoKeywords)) &&
1235 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) {
1236 Diag(IdLoc, diag::err_undef_interface_suggest)
1237 << Id << IDecl->getDeclName()
1238 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
1239 Diag(IDecl->getLocation(), diag::note_previous_decl)
1240 << IDecl->getDeclName();
1242 Id = IDecl->getIdentifier();
1246 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
1249 /// getNonFieldDeclScope - Retrieves the innermost scope, starting
1250 /// from S, where a non-field would be declared. This routine copes
1251 /// with the difference between C and C++ scoping rules in structs and
1252 /// unions. For example, the following code is well-formed in C but
1253 /// ill-formed in C++:
1259 /// void test_S6() {
1264 /// For the declaration of BAR, this routine will return a different
1265 /// scope. The scope S will be the scope of the unnamed enumeration
1266 /// within S6. In C++, this routine will return the scope associated
1267 /// with S6, because the enumeration's scope is a transparent
1268 /// context but structures can contain non-field names. In C, this
1269 /// routine will return the translation unit scope, since the
1270 /// enumeration's scope is a transparent context and structures cannot
1271 /// contain non-field names.
1272 Scope *Sema::getNonFieldDeclScope(Scope *S) {
1273 while (((S->getFlags() & Scope::DeclScope) == 0) ||
1275 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
1276 (S->isClassScope() && !getLangOptions().CPlusPlus))
1281 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
1282 /// file scope. lazily create a decl for it. ForRedeclaration is true
1283 /// if we're creating this built-in in anticipation of redeclaring the
1285 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
1286 Scope *S, bool ForRedeclaration,
1287 SourceLocation Loc) {
1288 Builtin::ID BID = (Builtin::ID)bid;
1290 ASTContext::GetBuiltinTypeError Error;
1291 QualType R = Context.GetBuiltinType(BID, Error);
1293 case ASTContext::GE_None:
1297 case ASTContext::GE_Missing_stdio:
1298 if (ForRedeclaration)
1299 Diag(Loc, diag::warn_implicit_decl_requires_stdio)
1300 << Context.BuiltinInfo.GetName(BID);
1303 case ASTContext::GE_Missing_setjmp:
1304 if (ForRedeclaration)
1305 Diag(Loc, diag::warn_implicit_decl_requires_setjmp)
1306 << Context.BuiltinInfo.GetName(BID);
1310 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
1311 Diag(Loc, diag::ext_implicit_lib_function_decl)
1312 << Context.BuiltinInfo.GetName(BID)
1314 if (Context.BuiltinInfo.getHeaderName(BID) &&
1315 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc)
1316 != DiagnosticsEngine::Ignored)
1317 Diag(Loc, diag::note_please_include_header)
1318 << Context.BuiltinInfo.getHeaderName(BID)
1319 << Context.BuiltinInfo.GetName(BID);
1322 FunctionDecl *New = FunctionDecl::Create(Context,
1323 Context.getTranslationUnitDecl(),
1324 Loc, Loc, II, R, /*TInfo=*/0,
1327 /*hasPrototype=*/true);
1330 // Create Decl objects for each parameter, adding them to the
1332 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
1333 SmallVector<ParmVarDecl*, 16> Params;
1334 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
1336 ParmVarDecl::Create(Context, New, SourceLocation(),
1337 SourceLocation(), 0,
1338 FT->getArgType(i), /*TInfo=*/0,
1339 SC_None, SC_None, 0);
1340 parm->setScopeInfo(0, i);
1341 Params.push_back(parm);
1343 New->setParams(Params);
1346 AddKnownFunctionAttributes(New);
1348 // TUScope is the translation-unit scope to insert this function into.
1349 // FIXME: This is hideous. We need to teach PushOnScopeChains to
1350 // relate Scopes to DeclContexts, and probably eliminate CurContext
1351 // entirely, but we're not there yet.
1352 DeclContext *SavedContext = CurContext;
1353 CurContext = Context.getTranslationUnitDecl();
1354 PushOnScopeChains(New, TUScope);
1355 CurContext = SavedContext;
1359 /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
1360 /// same name and scope as a previous declaration 'Old'. Figure out
1361 /// how to resolve this situation, merging decls or emitting
1362 /// diagnostics as appropriate. If there was an error, set New to be invalid.
1364 void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) {
1365 // If the new decl is known invalid already, don't bother doing any
1367 if (New->isInvalidDecl()) return;
1369 // Allow multiple definitions for ObjC built-in typedefs.
1370 // FIXME: Verify the underlying types are equivalent!
1371 if (getLangOptions().ObjC1) {
1372 const IdentifierInfo *TypeID = New->getIdentifier();
1373 switch (TypeID->getLength()) {
1376 if (!TypeID->isStr("id"))
1378 Context.setObjCIdRedefinitionType(New->getUnderlyingType());
1379 // Install the built-in type for 'id', ignoring the current definition.
1380 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
1383 if (!TypeID->isStr("Class"))
1385 Context.setObjCClassRedefinitionType(New->getUnderlyingType());
1386 // Install the built-in type for 'Class', ignoring the current definition.
1387 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
1390 if (!TypeID->isStr("SEL"))
1392 Context.setObjCSelRedefinitionType(New->getUnderlyingType());
1393 // Install the built-in type for 'SEL', ignoring the current definition.
1394 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
1397 // Fall through - the typedef name was not a builtin type.
1400 // Verify the old decl was also a type.
1401 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
1403 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1404 << New->getDeclName();
1406 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
1407 if (OldD->getLocation().isValid())
1408 Diag(OldD->getLocation(), diag::note_previous_definition);
1410 return New->setInvalidDecl();
1413 // If the old declaration is invalid, just give up here.
1414 if (Old->isInvalidDecl())
1415 return New->setInvalidDecl();
1417 // Determine the "old" type we'll use for checking and diagnostics.
1419 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
1420 OldType = OldTypedef->getUnderlyingType();
1422 OldType = Context.getTypeDeclType(Old);
1424 // If the typedef types are not identical, reject them in all languages and
1425 // with any extensions enabled.
1427 if (OldType != New->getUnderlyingType() &&
1428 Context.getCanonicalType(OldType) !=
1429 Context.getCanonicalType(New->getUnderlyingType())) {
1431 if (isa<TypeAliasDecl>(Old))
1433 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
1434 << Kind << New->getUnderlyingType() << OldType;
1435 if (Old->getLocation().isValid())
1436 Diag(Old->getLocation(), diag::note_previous_definition);
1437 return New->setInvalidDecl();
1440 // The types match. Link up the redeclaration chain if the old
1441 // declaration was a typedef.
1442 // FIXME: this is a potential source of weirdness if the type
1443 // spellings don't match exactly.
1444 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old))
1445 New->setPreviousDeclaration(Typedef);
1447 // __module_private__ is propagated to later declarations.
1448 if (Old->isModulePrivate())
1449 New->setModulePrivate();
1450 else if (New->isModulePrivate())
1451 diagnoseModulePrivateRedeclaration(New, Old);
1453 if (getLangOptions().MicrosoftExt)
1456 if (getLangOptions().CPlusPlus) {
1457 // C++ [dcl.typedef]p2:
1458 // In a given non-class scope, a typedef specifier can be used to
1459 // redefine the name of any type declared in that scope to refer
1460 // to the type to which it already refers.
1461 if (!isa<CXXRecordDecl>(CurContext))
1464 // C++0x [dcl.typedef]p4:
1465 // In a given class scope, a typedef specifier can be used to redefine
1466 // any class-name declared in that scope that is not also a typedef-name
1467 // to refer to the type to which it already refers.
1469 // This wording came in via DR424, which was a correction to the
1470 // wording in DR56, which accidentally banned code like:
1473 // typedef struct A { } A;
1476 // in the C++03 standard. We implement the C++0x semantics, which
1477 // allow the above but disallow
1484 // since that was the intent of DR56.
1485 if (!isa<TypedefNameDecl>(Old))
1488 Diag(New->getLocation(), diag::err_redefinition)
1489 << New->getDeclName();
1490 Diag(Old->getLocation(), diag::note_previous_definition);
1491 return New->setInvalidDecl();
1494 // If we have a redefinition of a typedef in C, emit a warning. This warning
1495 // is normally mapped to an error, but can be controlled with
1496 // -Wtypedef-redefinition. If either the original or the redefinition is
1497 // in a system header, don't emit this for compatibility with GCC.
1498 if (getDiagnostics().getSuppressSystemWarnings() &&
1499 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
1500 Context.getSourceManager().isInSystemHeader(New->getLocation())))
1503 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
1504 << New->getDeclName();
1505 Diag(Old->getLocation(), diag::note_previous_definition);
1509 /// DeclhasAttr - returns true if decl Declaration already has the target
1512 DeclHasAttr(const Decl *D, const Attr *A) {
1513 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
1514 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
1515 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
1516 if ((*i)->getKind() == A->getKind()) {
1518 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation())
1522 // FIXME: Don't hardcode this check
1523 if (OA && isa<OwnershipAttr>(*i))
1524 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
1531 /// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
1532 static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl,
1533 ASTContext &C, bool mergeDeprecation = true) {
1534 if (!oldDecl->hasAttrs())
1537 bool foundAny = newDecl->hasAttrs();
1539 // Ensure that any moving of objects within the allocated map is done before
1541 if (!foundAny) newDecl->setAttrs(AttrVec());
1543 for (specific_attr_iterator<InheritableAttr>
1544 i = oldDecl->specific_attr_begin<InheritableAttr>(),
1545 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) {
1546 // Ignore deprecated/unavailable/availability attributes if requested.
1547 if (!mergeDeprecation &&
1548 (isa<DeprecatedAttr>(*i) ||
1549 isa<UnavailableAttr>(*i) ||
1550 isa<AvailabilityAttr>(*i)))
1553 if (!DeclHasAttr(newDecl, *i)) {
1554 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C));
1555 newAttr->setInherited(true);
1556 newDecl->addAttr(newAttr);
1561 if (!foundAny) newDecl->dropAttrs();
1564 /// mergeParamDeclAttributes - Copy attributes from the old parameter
1566 static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
1567 const ParmVarDecl *oldDecl,
1569 if (!oldDecl->hasAttrs())
1572 bool foundAny = newDecl->hasAttrs();
1574 // Ensure that any moving of objects within the allocated map is
1575 // done before we process them.
1576 if (!foundAny) newDecl->setAttrs(AttrVec());
1578 for (specific_attr_iterator<InheritableParamAttr>
1579 i = oldDecl->specific_attr_begin<InheritableParamAttr>(),
1580 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) {
1581 if (!DeclHasAttr(newDecl, *i)) {
1582 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C));
1583 newAttr->setInherited(true);
1584 newDecl->addAttr(newAttr);
1589 if (!foundAny) newDecl->dropAttrs();
1594 /// Used in MergeFunctionDecl to keep track of function parameters in
1596 struct GNUCompatibleParamWarning {
1597 ParmVarDecl *OldParm;
1598 ParmVarDecl *NewParm;
1599 QualType PromotedType;
1604 /// getSpecialMember - get the special member enum for a method.
1605 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
1606 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
1607 if (Ctor->isDefaultConstructor())
1608 return Sema::CXXDefaultConstructor;
1610 if (Ctor->isCopyConstructor())
1611 return Sema::CXXCopyConstructor;
1613 if (Ctor->isMoveConstructor())
1614 return Sema::CXXMoveConstructor;
1615 } else if (isa<CXXDestructorDecl>(MD)) {
1616 return Sema::CXXDestructor;
1617 } else if (MD->isCopyAssignmentOperator()) {
1618 return Sema::CXXCopyAssignment;
1619 } else if (MD->isMoveAssignmentOperator()) {
1620 return Sema::CXXMoveAssignment;
1623 return Sema::CXXInvalid;
1626 /// canRedefineFunction - checks if a function can be redefined. Currently,
1627 /// only extern inline functions can be redefined, and even then only in
1629 static bool canRedefineFunction(const FunctionDecl *FD,
1630 const LangOptions& LangOpts) {
1631 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
1632 !LangOpts.CPlusPlus &&
1633 FD->isInlineSpecified() &&
1634 FD->getStorageClass() == SC_Extern);
1637 /// MergeFunctionDecl - We just parsed a function 'New' from
1638 /// declarator D which has the same name and scope as a previous
1639 /// declaration 'Old'. Figure out how to resolve this situation,
1640 /// merging decls or emitting diagnostics as appropriate.
1642 /// In C++, New and Old must be declarations that are not
1643 /// overloaded. Use IsOverload to determine whether New and Old are
1644 /// overloaded, and to select the Old declaration that New should be
1647 /// Returns true if there was an error, false otherwise.
1648 bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
1649 // Verify the old decl was also a function.
1650 FunctionDecl *Old = 0;
1651 if (FunctionTemplateDecl *OldFunctionTemplate
1652 = dyn_cast<FunctionTemplateDecl>(OldD))
1653 Old = OldFunctionTemplate->getTemplatedDecl();
1655 Old = dyn_cast<FunctionDecl>(OldD);
1657 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
1658 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
1659 Diag(Shadow->getTargetDecl()->getLocation(),
1660 diag::note_using_decl_target);
1661 Diag(Shadow->getUsingDecl()->getLocation(),
1662 diag::note_using_decl) << 0;
1666 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1667 << New->getDeclName();
1668 Diag(OldD->getLocation(), diag::note_previous_definition);
1672 // Determine whether the previous declaration was a definition,
1673 // implicit declaration, or a declaration.
1674 diag::kind PrevDiag;
1675 if (Old->isThisDeclarationADefinition())
1676 PrevDiag = diag::note_previous_definition;
1677 else if (Old->isImplicit())
1678 PrevDiag = diag::note_previous_implicit_declaration;
1680 PrevDiag = diag::note_previous_declaration;
1682 QualType OldQType = Context.getCanonicalType(Old->getType());
1683 QualType NewQType = Context.getCanonicalType(New->getType());
1685 // Don't complain about this if we're in GNU89 mode and the old function
1686 // is an extern inline function.
1687 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
1688 New->getStorageClass() == SC_Static &&
1689 Old->getStorageClass() != SC_Static &&
1690 !canRedefineFunction(Old, getLangOptions())) {
1691 if (getLangOptions().MicrosoftExt) {
1692 Diag(New->getLocation(), diag::warn_static_non_static) << New;
1693 Diag(Old->getLocation(), PrevDiag);
1695 Diag(New->getLocation(), diag::err_static_non_static) << New;
1696 Diag(Old->getLocation(), PrevDiag);
1701 // If a function is first declared with a calling convention, but is
1702 // later declared or defined without one, the second decl assumes the
1703 // calling convention of the first.
1705 // For the new decl, we have to look at the NON-canonical type to tell the
1706 // difference between a function that really doesn't have a calling
1707 // convention and one that is declared cdecl. That's because in
1708 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
1709 // because it is the default calling convention.
1711 // Note also that we DO NOT return at this point, because we still have
1712 // other tests to run.
1713 const FunctionType *OldType = cast<FunctionType>(OldQType);
1714 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
1715 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
1716 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
1717 bool RequiresAdjustment = false;
1718 if (OldTypeInfo.getCC() != CC_Default &&
1719 NewTypeInfo.getCC() == CC_Default) {
1720 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
1721 RequiresAdjustment = true;
1722 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
1723 NewTypeInfo.getCC())) {
1724 // Calling conventions really aren't compatible, so complain.
1725 Diag(New->getLocation(), diag::err_cconv_change)
1726 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
1727 << (OldTypeInfo.getCC() == CC_Default)
1728 << (OldTypeInfo.getCC() == CC_Default ? "" :
1729 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
1730 Diag(Old->getLocation(), diag::note_previous_declaration);
1734 // FIXME: diagnose the other way around?
1735 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
1736 NewTypeInfo = NewTypeInfo.withNoReturn(true);
1737 RequiresAdjustment = true;
1740 // Merge regparm attribute.
1741 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
1742 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
1743 if (NewTypeInfo.getHasRegParm()) {
1744 Diag(New->getLocation(), diag::err_regparm_mismatch)
1745 << NewType->getRegParmType()
1746 << OldType->getRegParmType();
1747 Diag(Old->getLocation(), diag::note_previous_declaration);
1751 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
1752 RequiresAdjustment = true;
1755 // Merge ns_returns_retained attribute.
1756 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
1757 if (NewTypeInfo.getProducesResult()) {
1758 Diag(New->getLocation(), diag::err_returns_retained_mismatch);
1759 Diag(Old->getLocation(), diag::note_previous_declaration);
1763 NewTypeInfo = NewTypeInfo.withProducesResult(true);
1764 RequiresAdjustment = true;
1767 if (RequiresAdjustment) {
1768 NewType = Context.adjustFunctionType(NewType, NewTypeInfo);
1769 New->setType(QualType(NewType, 0));
1770 NewQType = Context.getCanonicalType(New->getType());
1773 if (getLangOptions().CPlusPlus) {
1775 // Certain function declarations cannot be overloaded:
1776 // -- Function declarations that differ only in the return type
1777 // cannot be overloaded.
1778 QualType OldReturnType = OldType->getResultType();
1779 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType();
1781 if (OldReturnType != NewReturnType) {
1782 if (NewReturnType->isObjCObjectPointerType()
1783 && OldReturnType->isObjCObjectPointerType())
1784 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
1785 if (ResQT.isNull()) {
1786 if (New->isCXXClassMember() && New->isOutOfLine())
1787 Diag(New->getLocation(),
1788 diag::err_member_def_does_not_match_ret_type) << New;
1790 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
1791 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1798 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
1799 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
1800 if (OldMethod && NewMethod) {
1801 // Preserve triviality.
1802 NewMethod->setTrivial(OldMethod->isTrivial());
1804 // MSVC allows explicit template specialization at class scope:
1805 // 2 CXMethodDecls referring to the same function will be injected.
1806 // We don't want a redeclartion error.
1807 bool IsClassScopeExplicitSpecialization =
1808 OldMethod->isFunctionTemplateSpecialization() &&
1809 NewMethod->isFunctionTemplateSpecialization();
1810 bool isFriend = NewMethod->getFriendObjectKind();
1812 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
1813 !IsClassScopeExplicitSpecialization) {
1814 // -- Member function declarations with the same name and the
1815 // same parameter types cannot be overloaded if any of them
1816 // is a static member function declaration.
1817 if (OldMethod->isStatic() || NewMethod->isStatic()) {
1818 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
1819 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1823 // C++ [class.mem]p1:
1824 // [...] A member shall not be declared twice in the
1825 // member-specification, except that a nested class or member
1826 // class template can be declared and then later defined.
1828 if (isa<CXXConstructorDecl>(OldMethod))
1829 NewDiag = diag::err_constructor_redeclared;
1830 else if (isa<CXXDestructorDecl>(NewMethod))
1831 NewDiag = diag::err_destructor_redeclared;
1832 else if (isa<CXXConversionDecl>(NewMethod))
1833 NewDiag = diag::err_conv_function_redeclared;
1835 NewDiag = diag::err_member_redeclared;
1837 Diag(New->getLocation(), NewDiag);
1838 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1840 // Complain if this is an explicit declaration of a special
1841 // member that was initially declared implicitly.
1843 // As an exception, it's okay to befriend such methods in order
1844 // to permit the implicit constructor/destructor/operator calls.
1845 } else if (OldMethod->isImplicit()) {
1847 NewMethod->setImplicit();
1849 Diag(NewMethod->getLocation(),
1850 diag::err_definition_of_implicitly_declared_member)
1851 << New << getSpecialMember(OldMethod);
1854 } else if (OldMethod->isExplicitlyDefaulted()) {
1855 Diag(NewMethod->getLocation(),
1856 diag::err_definition_of_explicitly_defaulted_member)
1857 << getSpecialMember(OldMethod);
1863 // All declarations for a function shall agree exactly in both the
1864 // return type and the parameter-type-list.
1865 // We also want to respect all the extended bits except noreturn.
1867 // noreturn should now match unless the old type info didn't have it.
1868 QualType OldQTypeForComparison = OldQType;
1869 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
1870 assert(OldQType == QualType(OldType, 0));
1871 const FunctionType *OldTypeForComparison
1872 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
1873 OldQTypeForComparison = QualType(OldTypeForComparison, 0);
1874 assert(OldQTypeForComparison.isCanonical());
1877 if (OldQTypeForComparison == NewQType)
1878 return MergeCompatibleFunctionDecls(New, Old);
1880 // Fall through for conflicting redeclarations and redefinitions.
1883 // C: Function types need to be compatible, not identical. This handles
1884 // duplicate function decls like "void f(int); void f(enum X);" properly.
1885 if (!getLangOptions().CPlusPlus &&
1886 Context.typesAreCompatible(OldQType, NewQType)) {
1887 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
1888 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
1889 const FunctionProtoType *OldProto = 0;
1890 if (isa<FunctionNoProtoType>(NewFuncType) &&
1891 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
1892 // The old declaration provided a function prototype, but the
1893 // new declaration does not. Merge in the prototype.
1894 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
1895 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
1896 OldProto->arg_type_end());
1897 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
1898 ParamTypes.data(), ParamTypes.size(),
1899 OldProto->getExtProtoInfo());
1900 New->setType(NewQType);
1901 New->setHasInheritedPrototype();
1903 // Synthesize a parameter for each argument type.
1904 SmallVector<ParmVarDecl*, 16> Params;
1905 for (FunctionProtoType::arg_type_iterator
1906 ParamType = OldProto->arg_type_begin(),
1907 ParamEnd = OldProto->arg_type_end();
1908 ParamType != ParamEnd; ++ParamType) {
1909 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
1911 SourceLocation(), 0,
1912 *ParamType, /*TInfo=*/0,
1915 Param->setScopeInfo(0, Params.size());
1916 Param->setImplicit();
1917 Params.push_back(Param);
1920 New->setParams(Params);
1923 return MergeCompatibleFunctionDecls(New, Old);
1926 // GNU C permits a K&R definition to follow a prototype declaration
1927 // if the declared types of the parameters in the K&R definition
1928 // match the types in the prototype declaration, even when the
1929 // promoted types of the parameters from the K&R definition differ
1930 // from the types in the prototype. GCC then keeps the types from
1933 // If a variadic prototype is followed by a non-variadic K&R definition,
1934 // the K&R definition becomes variadic. This is sort of an edge case, but
1935 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
1937 if (!getLangOptions().CPlusPlus &&
1938 Old->hasPrototype() && !New->hasPrototype() &&
1939 New->getType()->getAs<FunctionProtoType>() &&
1940 Old->getNumParams() == New->getNumParams()) {
1941 SmallVector<QualType, 16> ArgTypes;
1942 SmallVector<GNUCompatibleParamWarning, 16> Warnings;
1943 const FunctionProtoType *OldProto
1944 = Old->getType()->getAs<FunctionProtoType>();
1945 const FunctionProtoType *NewProto
1946 = New->getType()->getAs<FunctionProtoType>();
1948 // Determine whether this is the GNU C extension.
1949 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
1950 NewProto->getResultType());
1951 bool LooseCompatible = !MergedReturn.isNull();
1952 for (unsigned Idx = 0, End = Old->getNumParams();
1953 LooseCompatible && Idx != End; ++Idx) {
1954 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
1955 ParmVarDecl *NewParm = New->getParamDecl(Idx);
1956 if (Context.typesAreCompatible(OldParm->getType(),
1957 NewProto->getArgType(Idx))) {
1958 ArgTypes.push_back(NewParm->getType());
1959 } else if (Context.typesAreCompatible(OldParm->getType(),
1961 /*CompareUnqualified=*/true)) {
1962 GNUCompatibleParamWarning Warn
1963 = { OldParm, NewParm, NewProto->getArgType(Idx) };
1964 Warnings.push_back(Warn);
1965 ArgTypes.push_back(NewParm->getType());
1967 LooseCompatible = false;
1970 if (LooseCompatible) {
1971 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
1972 Diag(Warnings[Warn].NewParm->getLocation(),
1973 diag::ext_param_promoted_not_compatible_with_prototype)
1974 << Warnings[Warn].PromotedType
1975 << Warnings[Warn].OldParm->getType();
1976 if (Warnings[Warn].OldParm->getLocation().isValid())
1977 Diag(Warnings[Warn].OldParm->getLocation(),
1978 diag::note_previous_declaration);
1981 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
1983 OldProto->getExtProtoInfo()));
1984 return MergeCompatibleFunctionDecls(New, Old);
1987 // Fall through to diagnose conflicting types.
1990 // A function that has already been declared has been redeclared or defined
1991 // with a different type- show appropriate diagnostic
1992 if (unsigned BuiltinID = Old->getBuiltinID()) {
1993 // The user has declared a builtin function with an incompatible
1995 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
1996 // The function the user is redeclaring is a library-defined
1997 // function like 'malloc' or 'printf'. Warn about the
1998 // redeclaration, then pretend that we don't know about this
1999 // library built-in.
2000 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
2001 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
2002 << Old << Old->getType();
2003 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
2004 Old->setInvalidDecl();
2008 PrevDiag = diag::note_previous_builtin_declaration;
2011 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
2012 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2016 /// \brief Completes the merge of two function declarations that are
2017 /// known to be compatible.
2019 /// This routine handles the merging of attributes and other
2020 /// properties of function declarations form the old declaration to
2021 /// the new declaration, once we know that New is in fact a
2022 /// redeclaration of Old.
2025 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) {
2026 // Merge the attributes
2027 mergeDeclAttributes(New, Old, Context);
2029 // Merge the storage class.
2030 if (Old->getStorageClass() != SC_Extern &&
2031 Old->getStorageClass() != SC_None)
2032 New->setStorageClass(Old->getStorageClass());
2034 // Merge "pure" flag.
2038 // __module_private__ is propagated to later declarations.
2039 if (Old->isModulePrivate())
2040 New->setModulePrivate();
2041 else if (New->isModulePrivate())
2042 diagnoseModulePrivateRedeclaration(New, Old);
2044 // Merge attributes from the parameters. These can mismatch with K&R
2046 if (New->getNumParams() == Old->getNumParams())
2047 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i)
2048 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i),
2051 if (getLangOptions().CPlusPlus)
2052 return MergeCXXFunctionDecl(New, Old);
2058 void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
2059 const ObjCMethodDecl *oldMethod) {
2060 // We don't want to merge unavailable and deprecated attributes
2061 // except from interface to implementation.
2062 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext());
2064 // Merge the attributes.
2065 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation);
2067 // Merge attributes from the parameters.
2068 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin();
2069 for (ObjCMethodDecl::param_iterator
2070 ni = newMethod->param_begin(), ne = newMethod->param_end();
2071 ni != ne; ++ni, ++oi)
2072 mergeParamDeclAttributes(*ni, *oi, Context);
2074 CheckObjCMethodOverride(newMethod, oldMethod, true);
2077 /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
2078 /// scope as a previous declaration 'Old'. Figure out how to merge their types,
2079 /// emitting diagnostics as appropriate.
2081 /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
2082 /// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't
2083 /// check them before the initializer is attached.
2085 void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) {
2086 if (New->isInvalidDecl() || Old->isInvalidDecl())
2090 if (getLangOptions().CPlusPlus) {
2091 AutoType *AT = New->getType()->getContainedAutoType();
2092 if (AT && !AT->isDeduced()) {
2093 // We don't know what the new type is until the initializer is attached.
2095 } else if (Context.hasSameType(New->getType(), Old->getType())) {
2096 // These could still be something that needs exception specs checked.
2097 return MergeVarDeclExceptionSpecs(New, Old);
2099 // C++ [basic.link]p10:
2100 // [...] the types specified by all declarations referring to a given
2101 // object or function shall be identical, except that declarations for an
2102 // array object can specify array types that differ by the presence or
2103 // absence of a major array bound (8.3.4).
2104 else if (Old->getType()->isIncompleteArrayType() &&
2105 New->getType()->isArrayType()) {
2106 CanQual<ArrayType> OldArray
2107 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
2108 CanQual<ArrayType> NewArray
2109 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
2110 if (OldArray->getElementType() == NewArray->getElementType())
2111 MergedT = New->getType();
2112 } else if (Old->getType()->isArrayType() &&
2113 New->getType()->isIncompleteArrayType()) {
2114 CanQual<ArrayType> OldArray
2115 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
2116 CanQual<ArrayType> NewArray
2117 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
2118 if (OldArray->getElementType() == NewArray->getElementType())
2119 MergedT = Old->getType();
2120 } else if (New->getType()->isObjCObjectPointerType()
2121 && Old->getType()->isObjCObjectPointerType()) {
2122 MergedT = Context.mergeObjCGCQualifiers(New->getType(),
2126 MergedT = Context.mergeTypes(New->getType(), Old->getType());
2128 if (MergedT.isNull()) {
2129 Diag(New->getLocation(), diag::err_redefinition_different_type)
2130 << New->getDeclName();
2131 Diag(Old->getLocation(), diag::note_previous_definition);
2132 return New->setInvalidDecl();
2134 New->setType(MergedT);
2137 /// MergeVarDecl - We just parsed a variable 'New' which has the same name
2138 /// and scope as a previous declaration 'Old'. Figure out how to resolve this
2139 /// situation, merging decls or emitting diagnostics as appropriate.
2141 /// Tentative definition rules (C99 6.9.2p2) are checked by
2142 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
2143 /// definitions here, since the initializer hasn't been attached.
2145 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
2146 // If the new decl is already invalid, don't do any other checking.
2147 if (New->isInvalidDecl())
2150 // Verify the old decl was also a variable.
2152 if (!Previous.isSingleResult() ||
2153 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
2154 Diag(New->getLocation(), diag::err_redefinition_different_kind)
2155 << New->getDeclName();
2156 Diag(Previous.getRepresentativeDecl()->getLocation(),
2157 diag::note_previous_definition);
2158 return New->setInvalidDecl();
2161 // C++ [class.mem]p1:
2162 // A member shall not be declared twice in the member-specification [...]
2164 // Here, we need only consider static data members.
2165 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
2166 Diag(New->getLocation(), diag::err_duplicate_member)
2167 << New->getIdentifier();
2168 Diag(Old->getLocation(), diag::note_previous_declaration);
2169 New->setInvalidDecl();
2172 mergeDeclAttributes(New, Old, Context);
2173 // Warn if an already-declared variable is made a weak_import in a subsequent declaration
2174 if (New->getAttr<WeakImportAttr>() &&
2175 Old->getStorageClass() == SC_None &&
2176 !Old->getAttr<WeakImportAttr>()) {
2177 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
2178 Diag(Old->getLocation(), diag::note_previous_definition);
2179 // Remove weak_import attribute on new declaration.
2180 New->dropAttr<WeakImportAttr>();
2184 MergeVarDeclTypes(New, Old);
2185 if (New->isInvalidDecl())
2188 // C99 6.2.2p4: Check if we have a static decl followed by a non-static.
2189 if (New->getStorageClass() == SC_Static &&
2190 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) {
2191 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
2192 Diag(Old->getLocation(), diag::note_previous_definition);
2193 return New->setInvalidDecl();
2196 // For an identifier declared with the storage-class specifier
2197 // extern in a scope in which a prior declaration of that
2198 // identifier is visible,23) if the prior declaration specifies
2199 // internal or external linkage, the linkage of the identifier at
2200 // the later declaration is the same as the linkage specified at
2201 // the prior declaration. If no prior declaration is visible, or
2202 // if the prior declaration specifies no linkage, then the
2203 // identifier has external linkage.
2204 if (New->hasExternalStorage() && Old->hasLinkage())
2206 else if (New->getStorageClass() != SC_Static &&
2207 Old->getStorageClass() == SC_Static) {
2208 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
2209 Diag(Old->getLocation(), diag::note_previous_definition);
2210 return New->setInvalidDecl();
2213 // Check if extern is followed by non-extern and vice-versa.
2214 if (New->hasExternalStorage() &&
2215 !Old->hasLinkage() && Old->isLocalVarDecl()) {
2216 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
2217 Diag(Old->getLocation(), diag::note_previous_definition);
2218 return New->setInvalidDecl();
2220 if (Old->hasExternalStorage() &&
2221 !New->hasLinkage() && New->isLocalVarDecl()) {
2222 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
2223 Diag(Old->getLocation(), diag::note_previous_definition);
2224 return New->setInvalidDecl();
2227 // __module_private__ is propagated to later declarations.
2228 if (Old->isModulePrivate())
2229 New->setModulePrivate();
2230 else if (New->isModulePrivate())
2231 diagnoseModulePrivateRedeclaration(New, Old);
2233 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
2235 // FIXME: The test for external storage here seems wrong? We still
2236 // need to check for mismatches.
2237 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
2238 // Don't complain about out-of-line definitions of static members.
2239 !(Old->getLexicalDeclContext()->isRecord() &&
2240 !New->getLexicalDeclContext()->isRecord())) {
2241 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
2242 Diag(Old->getLocation(), diag::note_previous_definition);
2243 return New->setInvalidDecl();
2246 if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
2247 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
2248 Diag(Old->getLocation(), diag::note_previous_definition);
2249 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
2250 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
2251 Diag(Old->getLocation(), diag::note_previous_definition);
2254 // C++ doesn't have tentative definitions, so go right ahead and check here.
2256 if (getLangOptions().CPlusPlus &&
2257 New->isThisDeclarationADefinition() == VarDecl::Definition &&
2258 (Def = Old->getDefinition())) {
2259 Diag(New->getLocation(), diag::err_redefinition)
2260 << New->getDeclName();
2261 Diag(Def->getLocation(), diag::note_previous_definition);
2262 New->setInvalidDecl();
2266 // For an identifier declared with the storage-class specifier extern in a
2267 // scope in which a prior declaration of that identifier is visible, if
2268 // the prior declaration specifies internal or external linkage, the linkage
2269 // of the identifier at the later declaration is the same as the linkage
2270 // specified at the prior declaration.
2271 // FIXME. revisit this code.
2272 if (New->hasExternalStorage() &&
2273 Old->getLinkage() == InternalLinkage &&
2274 New->getDeclContext() == Old->getDeclContext())
2275 New->setStorageClass(Old->getStorageClass());
2277 // Keep a chain of previous declarations.
2278 New->setPreviousDeclaration(Old);
2280 // Inherit access appropriately.
2281 New->setAccess(Old->getAccess());
2284 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
2285 /// no declarator (e.g. "struct foo;") is parsed.
2286 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
2288 return ParsedFreeStandingDeclSpec(S, AS, DS,
2289 MultiTemplateParamsArg(*this, 0, 0));
2292 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
2293 /// no declarator (e.g. "struct foo;") is parsed. It also accopts template
2294 /// parameters to cope with template friend declarations.
2295 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
2297 MultiTemplateParamsArg TemplateParams) {
2300 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
2301 DS.getTypeSpecType() == DeclSpec::TST_struct ||
2302 DS.getTypeSpecType() == DeclSpec::TST_union ||
2303 DS.getTypeSpecType() == DeclSpec::TST_enum) {
2304 TagD = DS.getRepAsDecl();
2306 if (!TagD) // We probably had an error
2309 // Note that the above type specs guarantee that the
2310 // type rep is a Decl, whereas in many of the others
2312 Tag = dyn_cast<TagDecl>(TagD);
2316 Tag->setFreeStanding();
2318 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
2319 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
2320 // or incomplete types shall not be restrict-qualified."
2321 if (TypeQuals & DeclSpec::TQ_restrict)
2322 Diag(DS.getRestrictSpecLoc(),
2323 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
2324 << DS.getSourceRange();
2327 if (DS.isConstexprSpecified()) {
2328 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
2329 // and definitions of functions and variables.
2331 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
2332 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
2333 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
2334 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3);
2336 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
2337 // Don't emit warnings after this error.
2341 if (DS.isFriendSpecified()) {
2342 // If we're dealing with a decl but not a TagDecl, assume that
2343 // whatever routines created it handled the friendship aspect.
2346 return ActOnFriendTypeDecl(S, DS, TemplateParams);
2349 // Track whether we warned about the fact that there aren't any
2351 bool emittedWarning = false;
2353 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
2354 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList());
2356 if (!Record->getDeclName() && Record->isCompleteDefinition() &&
2357 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
2358 if (getLangOptions().CPlusPlus ||
2359 Record->getDeclContext()->isRecord())
2360 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
2362 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
2363 << DS.getSourceRange();
2364 emittedWarning = true;
2368 // Check for Microsoft C extension: anonymous struct.
2369 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus &&
2370 CurContext->isRecord() &&
2371 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
2372 // Handle 2 kinds of anonymous struct:
2375 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
2376 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag);
2377 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) ||
2378 (DS.getTypeSpecType() == DeclSpec::TST_typename &&
2379 DS.getRepAsType().get()->isStructureType())) {
2380 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct)
2381 << DS.getSourceRange();
2382 return BuildMicrosoftCAnonymousStruct(S, DS, Record);
2386 if (getLangOptions().CPlusPlus &&
2387 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
2388 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
2389 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
2390 !Enum->getIdentifier() && !Enum->isInvalidDecl()) {
2391 Diag(Enum->getLocation(), diag::ext_no_declarators)
2392 << DS.getSourceRange();
2393 emittedWarning = true;
2396 // Skip all the checks below if we have a type error.
2397 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD;
2399 if (!DS.isMissingDeclaratorOk()) {
2400 // Warn about typedefs of enums without names, since this is an
2401 // extension in both Microsoft and GNU.
2402 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
2403 Tag && isa<EnumDecl>(Tag)) {
2404 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name)
2405 << DS.getSourceRange();
2409 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
2410 << DS.getSourceRange();
2411 emittedWarning = true;
2414 // We're going to complain about a bunch of spurious specifiers;
2415 // only do this if we're declaring a tag, because otherwise we
2416 // should be getting diag::ext_no_declarators.
2417 if (emittedWarning || (TagD && TagD->isInvalidDecl()))
2420 // Note that a linkage-specification sets a storage class, but
2421 // 'extern "C" struct foo;' is actually valid and not theoretically
2423 if (DeclSpec::SCS scs = DS.getStorageClassSpec())
2424 if (!DS.isExternInLinkageSpec())
2425 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier)
2426 << DeclSpec::getSpecifierName(scs);
2428 if (DS.isThreadSpecified())
2429 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread";
2430 if (DS.getTypeQualifiers()) {
2431 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
2432 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const";
2433 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
2434 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile";
2435 // Restrict is covered above.
2437 if (DS.isInlineSpecified())
2438 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline";
2439 if (DS.isVirtualSpecified())
2440 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual";
2441 if (DS.isExplicitSpecified())
2442 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit";
2444 if (DS.isModulePrivateSpecified() &&
2445 Tag && Tag->getDeclContext()->isFunctionOrMethod())
2446 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
2447 << Tag->getTagKind()
2448 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
2450 // FIXME: Warn on useless attributes
2455 /// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec.
2456 /// builds a statement for it and returns it so it is evaluated.
2457 StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) {
2459 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) {
2460 Expr *Exp = DS.getRepAsExpr();
2461 QualType Ty = Exp->getType();
2462 if (Ty->isPointerType()) {
2464 Ty = Ty->getAs<PointerType>()->getPointeeType();
2465 while (Ty->isPointerType());
2467 if (Ty->isVariableArrayType()) {
2468 R = ActOnExprStmt(MakeFullExpr(Exp));
2474 /// We are trying to inject an anonymous member into the given scope;
2475 /// check if there's an existing declaration that can't be overloaded.
2477 /// \return true if this is a forbidden redeclaration
2478 static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
2481 DeclarationName Name,
2482 SourceLocation NameLoc,
2483 unsigned diagnostic) {
2484 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
2485 Sema::ForRedeclaration);
2486 if (!SemaRef.LookupName(R, S)) return false;
2488 if (R.getAsSingle<TagDecl>())
2491 // Pick a representative declaration.
2492 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
2493 assert(PrevDecl && "Expected a non-null Decl");
2495 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
2498 SemaRef.Diag(NameLoc, diagnostic) << Name;
2499 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
2504 /// InjectAnonymousStructOrUnionMembers - Inject the members of the
2505 /// anonymous struct or union AnonRecord into the owning context Owner
2506 /// and scope S. This routine will be invoked just after we realize
2507 /// that an unnamed union or struct is actually an anonymous union or
2514 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
2515 /// // f into the surrounding scope.x
2518 /// This routine is recursive, injecting the names of nested anonymous
2519 /// structs/unions into the owning context and scope as well.
2520 static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
2522 RecordDecl *AnonRecord,
2524 SmallVector<NamedDecl*, 2> &Chaining,
2525 bool MSAnonStruct) {
2527 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
2528 : diag::err_anonymous_struct_member_redecl;
2530 bool Invalid = false;
2532 // Look every FieldDecl and IndirectFieldDecl with a name.
2533 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(),
2534 DEnd = AnonRecord->decls_end();
2536 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) &&
2537 cast<NamedDecl>(*D)->getDeclName()) {
2538 ValueDecl *VD = cast<ValueDecl>(*D);
2539 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
2540 VD->getLocation(), diagKind)) {
2541 // C++ [class.union]p2:
2542 // The names of the members of an anonymous union shall be
2543 // distinct from the names of any other entity in the
2544 // scope in which the anonymous union is declared.
2547 // C++ [class.union]p2:
2548 // For the purpose of name lookup, after the anonymous union
2549 // definition, the members of the anonymous union are
2550 // considered to have been defined in the scope in which the
2551 // anonymous union is declared.
2552 unsigned OldChainingSize = Chaining.size();
2553 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
2554 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(),
2555 PE = IF->chain_end(); PI != PE; ++PI)
2556 Chaining.push_back(*PI);
2558 Chaining.push_back(VD);
2560 assert(Chaining.size() >= 2);
2561 NamedDecl **NamedChain =
2562 new (SemaRef.Context)NamedDecl*[Chaining.size()];
2563 for (unsigned i = 0; i < Chaining.size(); i++)
2564 NamedChain[i] = Chaining[i];
2566 IndirectFieldDecl* IndirectField =
2567 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(),
2568 VD->getIdentifier(), VD->getType(),
2569 NamedChain, Chaining.size());
2571 IndirectField->setAccess(AS);
2572 IndirectField->setImplicit();
2573 SemaRef.PushOnScopeChains(IndirectField, S);
2575 // That includes picking up the appropriate access specifier.
2576 if (AS != AS_none) IndirectField->setAccess(AS);
2578 Chaining.resize(OldChainingSize);
2586 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
2587 /// a VarDecl::StorageClass. Any error reporting is up to the caller:
2588 /// illegal input values are mapped to SC_None.
2590 StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
2591 switch (StorageClassSpec) {
2592 case DeclSpec::SCS_unspecified: return SC_None;
2593 case DeclSpec::SCS_extern: return SC_Extern;
2594 case DeclSpec::SCS_static: return SC_Static;
2595 case DeclSpec::SCS_auto: return SC_Auto;
2596 case DeclSpec::SCS_register: return SC_Register;
2597 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
2598 // Illegal SCSs map to None: error reporting is up to the caller.
2599 case DeclSpec::SCS_mutable: // Fall through.
2600 case DeclSpec::SCS_typedef: return SC_None;
2602 llvm_unreachable("unknown storage class specifier");
2605 /// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
2606 /// a StorageClass. Any error reporting is up to the caller:
2607 /// illegal input values are mapped to SC_None.
2609 StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
2610 switch (StorageClassSpec) {
2611 case DeclSpec::SCS_unspecified: return SC_None;
2612 case DeclSpec::SCS_extern: return SC_Extern;
2613 case DeclSpec::SCS_static: return SC_Static;
2614 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
2615 // Illegal SCSs map to None: error reporting is up to the caller.
2616 case DeclSpec::SCS_auto: // Fall through.
2617 case DeclSpec::SCS_mutable: // Fall through.
2618 case DeclSpec::SCS_register: // Fall through.
2619 case DeclSpec::SCS_typedef: return SC_None;
2621 llvm_unreachable("unknown storage class specifier");
2624 /// BuildAnonymousStructOrUnion - Handle the declaration of an
2625 /// anonymous structure or union. Anonymous unions are a C++ feature
2626 /// (C++ [class.union]) and a GNU C extension; anonymous structures
2627 /// are a GNU C and GNU C++ extension.
2628 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
2630 RecordDecl *Record) {
2631 DeclContext *Owner = Record->getDeclContext();
2633 // Diagnose whether this anonymous struct/union is an extension.
2634 if (Record->isUnion() && !getLangOptions().CPlusPlus)
2635 Diag(Record->getLocation(), diag::ext_anonymous_union);
2636 else if (!Record->isUnion())
2637 Diag(Record->getLocation(), diag::ext_anonymous_struct);
2639 // C and C++ require different kinds of checks for anonymous
2641 bool Invalid = false;
2642 if (getLangOptions().CPlusPlus) {
2643 const char* PrevSpec = 0;
2645 // C++ [class.union]p3:
2646 // Anonymous unions declared in a named namespace or in the
2647 // global namespace shall be declared static.
2648 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
2649 (isa<TranslationUnitDecl>(Owner) ||
2650 (isa<NamespaceDecl>(Owner) &&
2651 cast<NamespaceDecl>(Owner)->getDeclName()))) {
2652 Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
2655 // Recover by adding 'static'.
2656 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
2659 // C++ [class.union]p3:
2660 // A storage class is not allowed in a declaration of an
2661 // anonymous union in a class scope.
2662 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
2663 isa<RecordDecl>(Owner)) {
2664 Diag(DS.getStorageClassSpecLoc(),
2665 diag::err_anonymous_union_with_storage_spec);
2668 // Recover by removing the storage specifier.
2669 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, SourceLocation(),
2673 // Ignore const/volatile/restrict qualifiers.
2674 if (DS.getTypeQualifiers()) {
2675 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
2676 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
2677 << Record->isUnion() << 0
2678 << FixItHint::CreateRemoval(DS.getConstSpecLoc());
2679 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
2680 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified)
2681 << Record->isUnion() << 1
2682 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
2683 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
2684 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified)
2685 << Record->isUnion() << 2
2686 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
2688 DS.ClearTypeQualifiers();
2691 // C++ [class.union]p2:
2692 // The member-specification of an anonymous union shall only
2693 // define non-static data members. [Note: nested types and
2694 // functions cannot be declared within an anonymous union. ]
2695 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
2696 MemEnd = Record->decls_end();
2697 Mem != MemEnd; ++Mem) {
2698 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
2699 // C++ [class.union]p3:
2700 // An anonymous union shall not have private or protected
2701 // members (clause 11).
2702 assert(FD->getAccess() != AS_none);
2703 if (FD->getAccess() != AS_public) {
2704 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
2705 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
2709 // C++ [class.union]p1
2710 // An object of a class with a non-trivial constructor, a non-trivial
2711 // copy constructor, a non-trivial destructor, or a non-trivial copy
2712 // assignment operator cannot be a member of a union, nor can an
2713 // array of such objects.
2714 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD))
2716 } else if ((*Mem)->isImplicit()) {
2717 // Any implicit members are fine.
2718 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
2719 // This is a type that showed up in an
2720 // elaborated-type-specifier inside the anonymous struct or
2721 // union, but which actually declares a type outside of the
2722 // anonymous struct or union. It's okay.
2723 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
2724 if (!MemRecord->isAnonymousStructOrUnion() &&
2725 MemRecord->getDeclName()) {
2726 // Visual C++ allows type definition in anonymous struct or union.
2727 if (getLangOptions().MicrosoftExt)
2728 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
2729 << (int)Record->isUnion();
2731 // This is a nested type declaration.
2732 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
2733 << (int)Record->isUnion();
2737 } else if (isa<AccessSpecDecl>(*Mem)) {
2738 // Any access specifier is fine.
2740 // We have something that isn't a non-static data
2741 // member. Complain about it.
2742 unsigned DK = diag::err_anonymous_record_bad_member;
2743 if (isa<TypeDecl>(*Mem))
2744 DK = diag::err_anonymous_record_with_type;
2745 else if (isa<FunctionDecl>(*Mem))
2746 DK = diag::err_anonymous_record_with_function;
2747 else if (isa<VarDecl>(*Mem))
2748 DK = diag::err_anonymous_record_with_static;
2750 // Visual C++ allows type definition in anonymous struct or union.
2751 if (getLangOptions().MicrosoftExt &&
2752 DK == diag::err_anonymous_record_with_type)
2753 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type)
2754 << (int)Record->isUnion();
2756 Diag((*Mem)->getLocation(), DK)
2757 << (int)Record->isUnion();
2764 if (!Record->isUnion() && !Owner->isRecord()) {
2765 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
2766 << (int)getLangOptions().CPlusPlus;
2770 // Mock up a declarator.
2771 Declarator Dc(DS, Declarator::MemberContext);
2772 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
2773 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
2775 // Create a declaration for this anonymous struct/union.
2776 NamedDecl *Anon = 0;
2777 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
2778 Anon = FieldDecl::Create(Context, OwningClass,
2779 DS.getSourceRange().getBegin(),
2780 Record->getLocation(),
2781 /*IdentifierInfo=*/0,
2782 Context.getTypeDeclType(Record),
2784 /*BitWidth=*/0, /*Mutable=*/false,
2786 Anon->setAccess(AS);
2787 if (getLangOptions().CPlusPlus)
2788 FieldCollector->Add(cast<FieldDecl>(Anon));
2790 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
2791 assert(SCSpec != DeclSpec::SCS_typedef &&
2792 "Parser allowed 'typedef' as storage class VarDecl.");
2793 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
2794 if (SCSpec == DeclSpec::SCS_mutable) {
2795 // mutable can only appear on non-static class members, so it's always
2797 Diag(Record->getLocation(), diag::err_mutable_nonmember);
2801 SCSpec = DS.getStorageClassSpecAsWritten();
2802 VarDecl::StorageClass SCAsWritten
2803 = StorageClassSpecToVarDeclStorageClass(SCSpec);
2805 Anon = VarDecl::Create(Context, Owner,
2806 DS.getSourceRange().getBegin(),
2807 Record->getLocation(), /*IdentifierInfo=*/0,
2808 Context.getTypeDeclType(Record),
2809 TInfo, SC, SCAsWritten);
2811 // Default-initialize the implicit variable. This initialization will be
2812 // trivial in almost all cases, except if a union member has an in-class
2814 // union { int n = 0; };
2815 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
2817 Anon->setImplicit();
2819 // Add the anonymous struct/union object to the current
2820 // context. We'll be referencing this object when we refer to one of
2822 Owner->addDecl(Anon);
2824 // Inject the members of the anonymous struct/union into the owning
2825 // context and into the identifier resolver chain for name lookup
2827 SmallVector<NamedDecl*, 2> Chain;
2828 Chain.push_back(Anon);
2830 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS,
2834 // Mark this as an anonymous struct/union type. Note that we do not
2835 // do this until after we have already checked and injected the
2836 // members of this anonymous struct/union type, because otherwise
2837 // the members could be injected twice: once by DeclContext when it
2838 // builds its lookup table, and once by
2839 // InjectAnonymousStructOrUnionMembers.
2840 Record->setAnonymousStructOrUnion(true);
2843 Anon->setInvalidDecl();
2848 /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
2849 /// Microsoft C anonymous structure.
2850 /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
2853 /// struct A { int a; };
2854 /// struct B { struct A; int b; };
2861 Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
2862 RecordDecl *Record) {
2864 // If there is no Record, get the record via the typedef.
2866 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl();
2868 // Mock up a declarator.
2869 Declarator Dc(DS, Declarator::TypeNameContext);
2870 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
2871 assert(TInfo && "couldn't build declarator info for anonymous struct");
2873 // Create a declaration for this anonymous struct.
2874 NamedDecl* Anon = FieldDecl::Create(Context,
2875 cast<RecordDecl>(CurContext),
2876 DS.getSourceRange().getBegin(),
2877 DS.getSourceRange().getBegin(),
2878 /*IdentifierInfo=*/0,
2879 Context.getTypeDeclType(Record),
2881 /*BitWidth=*/0, /*Mutable=*/false,
2883 Anon->setImplicit();
2885 // Add the anonymous struct object to the current context.
2886 CurContext->addDecl(Anon);
2888 // Inject the members of the anonymous struct into the current
2889 // context and into the identifier resolver chain for name lookup
2891 SmallVector<NamedDecl*, 2> Chain;
2892 Chain.push_back(Anon);
2894 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext,
2895 Record->getDefinition(),
2896 AS_none, Chain, true))
2897 Anon->setInvalidDecl();
2902 /// GetNameForDeclarator - Determine the full declaration name for the
2903 /// given Declarator.
2904 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
2905 return GetNameFromUnqualifiedId(D.getName());
2908 /// \brief Retrieves the declaration name from a parsed unqualified-id.
2910 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
2911 DeclarationNameInfo NameInfo;
2912 NameInfo.setLoc(Name.StartLocation);
2914 switch (Name.getKind()) {
2916 case UnqualifiedId::IK_ImplicitSelfParam:
2917 case UnqualifiedId::IK_Identifier:
2918 NameInfo.setName(Name.Identifier);
2919 NameInfo.setLoc(Name.StartLocation);
2922 case UnqualifiedId::IK_OperatorFunctionId:
2923 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
2924 Name.OperatorFunctionId.Operator));
2925 NameInfo.setLoc(Name.StartLocation);
2926 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
2927 = Name.OperatorFunctionId.SymbolLocations[0];
2928 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
2929 = Name.EndLocation.getRawEncoding();
2932 case UnqualifiedId::IK_LiteralOperatorId:
2933 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
2935 NameInfo.setLoc(Name.StartLocation);
2936 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
2939 case UnqualifiedId::IK_ConversionFunctionId: {
2940 TypeSourceInfo *TInfo;
2941 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
2943 return DeclarationNameInfo();
2944 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
2945 Context.getCanonicalType(Ty)));
2946 NameInfo.setLoc(Name.StartLocation);
2947 NameInfo.setNamedTypeInfo(TInfo);
2951 case UnqualifiedId::IK_ConstructorName: {
2952 TypeSourceInfo *TInfo;
2953 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
2955 return DeclarationNameInfo();
2956 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2957 Context.getCanonicalType(Ty)));
2958 NameInfo.setLoc(Name.StartLocation);
2959 NameInfo.setNamedTypeInfo(TInfo);
2963 case UnqualifiedId::IK_ConstructorTemplateId: {
2964 // In well-formed code, we can only have a constructor
2965 // template-id that refers to the current context, so go there
2966 // to find the actual type being constructed.
2967 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
2968 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
2969 return DeclarationNameInfo();
2971 // Determine the type of the class being constructed.
2972 QualType CurClassType = Context.getTypeDeclType(CurClass);
2974 // FIXME: Check two things: that the template-id names the same type as
2975 // CurClassType, and that the template-id does not occur when the name
2978 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2979 Context.getCanonicalType(CurClassType)));
2980 NameInfo.setLoc(Name.StartLocation);
2981 // FIXME: should we retrieve TypeSourceInfo?
2982 NameInfo.setNamedTypeInfo(0);
2986 case UnqualifiedId::IK_DestructorName: {
2987 TypeSourceInfo *TInfo;
2988 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
2990 return DeclarationNameInfo();
2991 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
2992 Context.getCanonicalType(Ty)));
2993 NameInfo.setLoc(Name.StartLocation);
2994 NameInfo.setNamedTypeInfo(TInfo);
2998 case UnqualifiedId::IK_TemplateId: {
2999 TemplateName TName = Name.TemplateId->Template.get();
3000 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
3001 return Context.getNameForTemplate(TName, TNameLoc);
3004 } // switch (Name.getKind())
3006 llvm_unreachable("Unknown name kind");
3009 static QualType getCoreType(QualType Ty) {
3011 if (Ty->isPointerType() || Ty->isReferenceType())
3012 Ty = Ty->getPointeeType();
3013 else if (Ty->isArrayType())
3014 Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
3016 return Ty.withoutLocalFastQualifiers();
3020 /// hasSimilarParameters - Determine whether the C++ functions Declaration
3021 /// and Definition have "nearly" matching parameters. This heuristic is
3022 /// used to improve diagnostics in the case where an out-of-line function
3023 /// definition doesn't match any declaration within the class or namespace.
3024 /// Also sets Params to the list of indices to the parameters that differ
3025 /// between the declaration and the definition. If hasSimilarParameters
3026 /// returns true and Params is empty, then all of the parameters match.
3027 static bool hasSimilarParameters(ASTContext &Context,
3028 FunctionDecl *Declaration,
3029 FunctionDecl *Definition,
3030 llvm::SmallVectorImpl<unsigned> &Params) {
3032 if (Declaration->param_size() != Definition->param_size())
3034 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
3035 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
3036 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
3038 // The parameter types are identical
3039 if (Context.hasSameType(DefParamTy, DeclParamTy))
3042 QualType DeclParamBaseTy = getCoreType(DeclParamTy);
3043 QualType DefParamBaseTy = getCoreType(DefParamTy);
3044 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
3045 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
3047 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
3048 (DeclTyName && DeclTyName == DefTyName))
3049 Params.push_back(Idx);
3050 else // The two parameters aren't even close
3057 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given
3058 /// declarator needs to be rebuilt in the current instantiation.
3059 /// Any bits of declarator which appear before the name are valid for
3060 /// consideration here. That's specifically the type in the decl spec
3061 /// and the base type in any member-pointer chunks.
3062 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
3063 DeclarationName Name) {
3064 // The types we specifically need to rebuild are:
3065 // - typenames, typeofs, and decltypes
3066 // - types which will become injected class names
3067 // Of course, we also need to rebuild any type referencing such a
3068 // type. It's safest to just say "dependent", but we call out a
3071 DeclSpec &DS = D.getMutableDeclSpec();
3072 switch (DS.getTypeSpecType()) {
3073 case DeclSpec::TST_typename:
3074 case DeclSpec::TST_typeofType:
3075 case DeclSpec::TST_decltype:
3076 case DeclSpec::TST_underlyingType:
3077 case DeclSpec::TST_atomic: {
3078 // Grab the type from the parser.
3079 TypeSourceInfo *TSI = 0;
3080 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
3081 if (T.isNull() || !T->isDependentType()) break;
3083 // Make sure there's a type source info. This isn't really much
3084 // of a waste; most dependent types should have type source info
3085 // attached already.
3087 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
3089 // Rebuild the type in the current instantiation.
3090 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
3091 if (!TSI) return true;
3093 // Store the new type back in the decl spec.
3094 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
3095 DS.UpdateTypeRep(LocType);
3099 case DeclSpec::TST_typeofExpr: {
3100 Expr *E = DS.getRepAsExpr();
3101 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
3102 if (Result.isInvalid()) return true;
3103 DS.UpdateExprRep(Result.get());
3108 // Nothing to do for these decl specs.
3112 // It doesn't matter what order we do this in.
3113 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3114 DeclaratorChunk &Chunk = D.getTypeObject(I);
3116 // The only type information in the declarator which can come
3117 // before the declaration name is the base type of a member
3119 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
3122 // Rebuild the scope specifier in-place.
3123 CXXScopeSpec &SS = Chunk.Mem.Scope();
3124 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
3131 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
3132 D.setFunctionDefinition(false);
3133 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this));
3136 /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
3137 /// If T is the name of a class, then each of the following shall have a
3138 /// name different from T:
3139 /// - every static data member of class T;
3140 /// - every member function of class T
3141 /// - every member of class T that is itself a type;
3142 /// \returns true if the declaration name violates these rules.
3143 bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
3144 DeclarationNameInfo NameInfo) {
3145 DeclarationName Name = NameInfo.getName();
3147 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC))
3148 if (Record->getIdentifier() && Record->getDeclName() == Name) {
3149 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
3156 Decl *Sema::HandleDeclarator(Scope *S, Declarator &D,
3157 MultiTemplateParamsArg TemplateParamLists) {
3158 // TODO: consider using NameInfo for diagnostic.
3159 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3160 DeclarationName Name = NameInfo.getName();
3162 // All of these full declarators require an identifier. If it doesn't have
3163 // one, the ParsedFreeStandingDeclSpec action should be used.
3165 if (!D.isInvalidType()) // Reject this if we think it is valid.
3166 Diag(D.getDeclSpec().getSourceRange().getBegin(),
3167 diag::err_declarator_need_ident)
3168 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
3170 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
3173 // The scope passed in may not be a decl scope. Zip up the scope tree until
3174 // we find one that is.
3175 while ((S->getFlags() & Scope::DeclScope) == 0 ||
3176 (S->getFlags() & Scope::TemplateParamScope) != 0)
3179 DeclContext *DC = CurContext;
3180 if (D.getCXXScopeSpec().isInvalid())
3182 else if (D.getCXXScopeSpec().isSet()) {
3183 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
3184 UPPC_DeclarationQualifier))
3187 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
3188 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
3190 // If we could not compute the declaration context, it's because the
3191 // declaration context is dependent but does not refer to a class,
3192 // class template, or class template partial specialization. Complain
3193 // and return early, to avoid the coming semantic disaster.
3194 Diag(D.getIdentifierLoc(),
3195 diag::err_template_qualified_declarator_no_match)
3196 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
3197 << D.getCXXScopeSpec().getRange();
3200 bool IsDependentContext = DC->isDependentContext();
3202 if (!IsDependentContext &&
3203 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
3206 if (isa<CXXRecordDecl>(DC)) {
3207 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) {
3208 Diag(D.getIdentifierLoc(),
3209 diag::err_member_def_undefined_record)
3210 << Name << DC << D.getCXXScopeSpec().getRange();
3212 } else if (isa<CXXRecordDecl>(CurContext) &&
3213 !D.getDeclSpec().isFriendSpecified()) {
3214 // The user provided a superfluous scope specifier inside a class
3220 if (CurContext->Equals(DC))
3221 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification)
3222 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange());
3224 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
3225 << Name << D.getCXXScopeSpec().getRange();
3227 // Pretend that this qualifier was not here.
3228 D.getCXXScopeSpec().clear();
3232 // Check whether we need to rebuild the type of the given
3233 // declaration in the current instantiation.
3234 if (EnteringContext && IsDependentContext &&
3235 TemplateParamLists.size() != 0) {
3236 ContextRAII SavedContext(*this, DC);
3237 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
3242 if (DiagnoseClassNameShadow(DC, NameInfo))
3243 // If this is a typedef, we'll end up spewing multiple diagnostics.
3244 // Just return early; it's safer.
3245 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3250 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3251 QualType R = TInfo->getType();
3253 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
3254 UPPC_DeclarationType))
3257 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
3260 // See if this is a redefinition of a variable in the same scope.
3261 if (!D.getCXXScopeSpec().isSet()) {
3262 bool IsLinkageLookup = false;
3264 // If the declaration we're planning to build will be a function
3265 // or object with linkage, then look for another declaration with
3266 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
3267 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3269 else if (R->isFunctionType()) {
3270 if (CurContext->isFunctionOrMethod() ||
3271 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
3272 IsLinkageLookup = true;
3273 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
3274 IsLinkageLookup = true;
3275 else if (CurContext->getRedeclContext()->isTranslationUnit() &&
3276 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
3277 IsLinkageLookup = true;
3279 if (IsLinkageLookup)
3280 Previous.clear(LookupRedeclarationWithLinkage);
3282 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
3283 } else { // Something like "int foo::x;"
3284 LookupQualifiedName(Previous, DC);
3286 // Don't consider using declarations as previous declarations for
3287 // out-of-line members.
3288 RemoveUsingDecls(Previous);
3291 // Members (including explicit specializations of templates) of a named
3292 // namespace can also be defined outside that namespace by explicit
3293 // qualification of the name being defined, provided that the entity being
3294 // defined was already declared in the namespace and the definition appears
3295 // after the point of declaration in a namespace that encloses the
3296 // declarations namespace.
3298 // Note that we only check the context at this point. We don't yet
3299 // have enough information to make sure that PrevDecl is actually
3300 // the declaration we want to match. For example, given:
3307 // void X::f(int) { } // ill-formed
3309 // In this case, PrevDecl will point to the overload set
3310 // containing the two f's declared in X, but neither of them
3313 // First check whether we named the global scope.
3314 if (isa<TranslationUnitDecl>(DC)) {
3315 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope)
3316 << Name << D.getCXXScopeSpec().getRange();
3318 DeclContext *Cur = CurContext;
3319 while (isa<LinkageSpecDecl>(Cur))
3320 Cur = Cur->getParent();
3321 if (!Cur->Encloses(DC)) {
3322 // The qualifying scope doesn't enclose the original declaration.
3323 // Emit diagnostic based on current scope.
3324 SourceLocation L = D.getIdentifierLoc();
3325 SourceRange R = D.getCXXScopeSpec().getRange();
3326 if (isa<FunctionDecl>(Cur))
3327 Diag(L, diag::err_invalid_declarator_in_function) << Name << R;
3329 Diag(L, diag::err_invalid_declarator_scope)
3330 << Name << cast<NamedDecl>(DC) << R;
3336 if (Previous.isSingleResult() &&
3337 Previous.getFoundDecl()->isTemplateParameter()) {
3338 // Maybe we will complain about the shadowed template parameter.
3339 if (!D.isInvalidType())
3340 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
3341 Previous.getFoundDecl()))
3344 // Just pretend that we didn't see the previous declaration.
3348 // In C++, the previous declaration we find might be a tag type
3349 // (class or enum). In this case, the new declaration will hide the
3350 // tag type. Note that this does does not apply if we're declaring a
3351 // typedef (C++ [dcl.typedef]p4).
3352 if (Previous.isSingleTagDecl() &&
3353 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
3356 bool AddToScope = true;
3357 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
3358 if (TemplateParamLists.size()) {
3359 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
3363 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
3364 } else if (R->isFunctionType()) {
3365 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
3366 move(TemplateParamLists),
3369 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
3370 move(TemplateParamLists));
3376 // If this has an identifier and is not an invalid redeclaration or
3377 // function template specialization, add it to the scope stack.
3378 if (New->getDeclName() && AddToScope &&
3379 !(D.isRedeclaration() && New->isInvalidDecl()))
3380 PushOnScopeChains(New, S);
3385 /// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
3386 /// types into constant array types in certain situations which would otherwise
3387 /// be errors (for GCC compatibility).
3388 static QualType TryToFixInvalidVariablyModifiedType(QualType T,
3389 ASTContext &Context,
3390 bool &SizeIsNegative,
3391 llvm::APSInt &Oversized) {
3392 // This method tries to turn a variable array into a constant
3393 // array even when the size isn't an ICE. This is necessary
3394 // for compatibility with code that depends on gcc's buggy
3395 // constant expression folding, like struct {char x[(int)(char*)2];}
3396 SizeIsNegative = false;
3399 if (T->isDependentType())
3402 QualifierCollector Qs;
3403 const Type *Ty = Qs.strip(T);
3405 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
3406 QualType Pointee = PTy->getPointeeType();
3407 QualType FixedType =
3408 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
3410 if (FixedType.isNull()) return FixedType;
3411 FixedType = Context.getPointerType(FixedType);
3412 return Qs.apply(Context, FixedType);
3414 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
3415 QualType Inner = PTy->getInnerType();
3416 QualType FixedType =
3417 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
3419 if (FixedType.isNull()) return FixedType;
3420 FixedType = Context.getParenType(FixedType);
3421 return Qs.apply(Context, FixedType);
3424 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
3427 // FIXME: We should probably handle this case
3428 if (VLATy->getElementType()->isVariablyModifiedType())
3431 Expr::EvalResult EvalResult;
3432 if (!VLATy->getSizeExpr() ||
3433 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) ||
3434 !EvalResult.Val.isInt())
3437 // Check whether the array size is negative.
3438 llvm::APSInt &Res = EvalResult.Val.getInt();
3439 if (Res.isSigned() && Res.isNegative()) {
3440 SizeIsNegative = true;
3444 // Check whether the array is too large to be addressed.
3445 unsigned ActiveSizeBits
3446 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
3448 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
3453 return Context.getConstantArrayType(VLATy->getElementType(),
3454 Res, ArrayType::Normal, 0);
3457 /// \brief Register the given locally-scoped external C declaration so
3458 /// that it can be found later for redeclarations
3460 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
3461 const LookupResult &Previous,
3463 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
3464 "Decl is not a locally-scoped decl!");
3465 // Note that we have a locally-scoped external with this name.
3466 LocallyScopedExternalDecls[ND->getDeclName()] = ND;
3468 if (!Previous.isSingleResult())
3471 NamedDecl *PrevDecl = Previous.getFoundDecl();
3473 // If there was a previous declaration of this variable, it may be
3474 // in our identifier chain. Update the identifier chain with the new
3476 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
3477 // The previous declaration was found on the identifer resolver
3478 // chain, so remove it from its scope.
3480 if (S->isDeclScope(PrevDecl)) {
3481 // Special case for redeclarations in the SAME scope.
3482 // Because this declaration is going to be added to the identifier chain
3483 // later, we should temporarily take it OFF the chain.
3484 IdResolver.RemoveDecl(ND);
3487 // Find the scope for the original declaration.
3488 while (S && !S->isDeclScope(PrevDecl))
3493 S->RemoveDecl(PrevDecl);
3497 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
3498 Sema::findLocallyScopedExternalDecl(DeclarationName Name) {
3499 if (ExternalSource) {
3500 // Load locally-scoped external decls from the external source.
3501 SmallVector<NamedDecl *, 4> Decls;
3502 ExternalSource->ReadLocallyScopedExternalDecls(Decls);
3503 for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
3504 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
3505 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName());
3506 if (Pos == LocallyScopedExternalDecls.end())
3507 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I];
3511 return LocallyScopedExternalDecls.find(Name);
3514 /// \brief Diagnose function specifiers on a declaration of an identifier that
3515 /// does not identify a function.
3516 void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
3517 // FIXME: We should probably indicate the identifier in question to avoid
3518 // confusion for constructs like "inline int a(), b;"
3519 if (D.getDeclSpec().isInlineSpecified())
3520 Diag(D.getDeclSpec().getInlineSpecLoc(),
3521 diag::err_inline_non_function);
3523 if (D.getDeclSpec().isVirtualSpecified())
3524 Diag(D.getDeclSpec().getVirtualSpecLoc(),
3525 diag::err_virtual_non_function);
3527 if (D.getDeclSpec().isExplicitSpecified())
3528 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3529 diag::err_explicit_non_function);
3533 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
3534 TypeSourceInfo *TInfo, LookupResult &Previous) {
3535 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
3536 if (D.getCXXScopeSpec().isSet()) {
3537 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
3538 << D.getCXXScopeSpec().getRange();
3540 // Pretend we didn't see the scope specifier.
3545 if (getLangOptions().CPlusPlus) {
3546 // Check that there are no default arguments (C++ only).
3547 CheckExtraCXXDefaultArguments(D);
3550 DiagnoseFunctionSpecifiers(D);
3552 if (D.getDeclSpec().isThreadSpecified())
3553 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
3554 if (D.getDeclSpec().isConstexprSpecified())
3555 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
3558 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
3559 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
3560 << D.getName().getSourceRange();
3564 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
3565 if (!NewTD) return 0;
3567 // Handle attributes prior to checking for duplicates in MergeVarDecl
3568 ProcessDeclAttributes(S, NewTD, D);
3570 CheckTypedefForVariablyModifiedType(S, NewTD);
3572 bool Redeclaration = D.isRedeclaration();
3573 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
3574 D.setRedeclaration(Redeclaration);
3579 Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
3580 // C99 6.7.7p2: If a typedef name specifies a variably modified type
3581 // then it shall have block scope.
3582 // Note that variably modified types must be fixed before merging the decl so
3583 // that redeclarations will match.
3584 QualType T = NewTD->getUnderlyingType();
3585 if (T->isVariablyModifiedType()) {
3586 getCurFunction()->setHasBranchProtectedScope();
3588 if (S->getFnParent() == 0) {
3589 bool SizeIsNegative;
3590 llvm::APSInt Oversized;
3592 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
3594 if (!FixedTy.isNull()) {
3595 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
3596 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
3599 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
3600 else if (T->isVariableArrayType())
3601 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
3602 else if (Oversized.getBoolValue())
3603 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10);
3605 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
3606 NewTD->setInvalidDecl();
3613 /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
3614 /// declares a typedef-name, either using the 'typedef' type specifier or via
3615 /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
3617 Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
3618 LookupResult &Previous, bool &Redeclaration) {
3619 // Merge the decl with the existing one if appropriate. If the decl is
3620 // in an outer scope, it isn't the same thing.
3621 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false,
3622 /*ExplicitInstantiationOrSpecialization=*/false);
3623 if (!Previous.empty()) {
3624 Redeclaration = true;
3625 MergeTypedefNameDecl(NewTD, Previous);
3628 // If this is the C FILE type, notify the AST context.
3629 if (IdentifierInfo *II = NewTD->getIdentifier())
3630 if (!NewTD->isInvalidDecl() &&
3631 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
3632 if (II->isStr("FILE"))
3633 Context.setFILEDecl(NewTD);
3634 else if (II->isStr("jmp_buf"))
3635 Context.setjmp_bufDecl(NewTD);
3636 else if (II->isStr("sigjmp_buf"))
3637 Context.setsigjmp_bufDecl(NewTD);
3638 else if (II->isStr("__builtin_va_list"))
3639 Context.setBuiltinVaListType(Context.getTypedefType(NewTD));
3645 /// \brief Determines whether the given declaration is an out-of-scope
3646 /// previous declaration.
3648 /// This routine should be invoked when name lookup has found a
3649 /// previous declaration (PrevDecl) that is not in the scope where a
3650 /// new declaration by the same name is being introduced. If the new
3651 /// declaration occurs in a local scope, previous declarations with
3652 /// linkage may still be considered previous declarations (C99
3653 /// 6.2.2p4-5, C++ [basic.link]p6).
3655 /// \param PrevDecl the previous declaration found by name
3658 /// \param DC the context in which the new declaration is being
3661 /// \returns true if PrevDecl is an out-of-scope previous declaration
3662 /// for a new delcaration with the same name.
3664 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
3665 ASTContext &Context) {
3669 if (!PrevDecl->hasLinkage())
3672 if (Context.getLangOptions().CPlusPlus) {
3673 // C++ [basic.link]p6:
3674 // If there is a visible declaration of an entity with linkage
3675 // having the same name and type, ignoring entities declared
3676 // outside the innermost enclosing namespace scope, the block
3677 // scope declaration declares that same entity and receives the
3678 // linkage of the previous declaration.
3679 DeclContext *OuterContext = DC->getRedeclContext();
3680 if (!OuterContext->isFunctionOrMethod())
3681 // This rule only applies to block-scope declarations.
3684 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
3685 if (PrevOuterContext->isRecord())
3686 // We found a member function: ignore it.
3689 // Find the innermost enclosing namespace for the new and
3690 // previous declarations.
3691 OuterContext = OuterContext->getEnclosingNamespaceContext();
3692 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
3694 // The previous declaration is in a different namespace, so it
3695 // isn't the same function.
3696 if (!OuterContext->Equals(PrevOuterContext))
3703 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
3704 CXXScopeSpec &SS = D.getCXXScopeSpec();
3705 if (!SS.isSet()) return;
3706 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
3709 bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
3710 QualType type = decl->getType();
3711 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
3712 if (lifetime == Qualifiers::OCL_Autoreleasing) {
3713 // Various kinds of declaration aren't allowed to be __autoreleasing.
3714 unsigned kind = -1U;
3715 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
3716 if (var->hasAttr<BlocksAttr>())
3717 kind = 0; // __block
3718 else if (!var->hasLocalStorage())
3720 } else if (isa<ObjCIvarDecl>(decl)) {
3722 } else if (isa<FieldDecl>(decl)) {
3727 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
3730 } else if (lifetime == Qualifiers::OCL_None) {
3731 // Try to infer lifetime.
3732 if (!type->isObjCLifetimeType())
3735 lifetime = type->getObjCARCImplicitLifetime();
3736 type = Context.getLifetimeQualifiedType(type, lifetime);
3737 decl->setType(type);
3740 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
3741 // Thread-local variables cannot have lifetime.
3742 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
3743 var->isThreadSpecified()) {
3744 Diag(var->getLocation(), diag::err_arc_thread_ownership)
3754 Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
3755 TypeSourceInfo *TInfo, LookupResult &Previous,
3756 MultiTemplateParamsArg TemplateParamLists) {
3757 QualType R = TInfo->getType();
3758 DeclarationName Name = GetNameForDeclarator(D).getName();
3760 // Check that there are no default arguments (C++ only).
3761 if (getLangOptions().CPlusPlus)
3762 CheckExtraCXXDefaultArguments(D);
3764 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
3765 assert(SCSpec != DeclSpec::SCS_typedef &&
3766 "Parser allowed 'typedef' as storage class VarDecl.");
3767 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
3768 if (SCSpec == DeclSpec::SCS_mutable) {
3769 // mutable can only appear on non-static class members, so it's always
3771 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
3775 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
3776 VarDecl::StorageClass SCAsWritten
3777 = StorageClassSpecToVarDeclStorageClass(SCSpec);
3779 IdentifierInfo *II = Name.getAsIdentifierInfo();
3781 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
3786 DiagnoseFunctionSpecifiers(D);
3788 if (!DC->isRecord() && S->getFnParent() == 0) {
3789 // C99 6.9p2: The storage-class specifiers auto and register shall not
3790 // appear in the declaration specifiers in an external declaration.
3791 if (SC == SC_Auto || SC == SC_Register) {
3793 // If this is a register variable with an asm label specified, then this
3794 // is a GNU extension.
3795 if (SC == SC_Register && D.getAsmLabel())
3796 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
3798 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
3803 if (getLangOptions().OpenCL) {
3804 // Set up the special work-group-local storage class for variables in the
3805 // OpenCL __local address space.
3806 if (R.getAddressSpace() == LangAS::opencl_local)
3807 SC = SC_OpenCLWorkGroupLocal;
3810 bool isExplicitSpecialization = false;
3812 if (!getLangOptions().CPlusPlus) {
3813 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(),
3814 D.getIdentifierLoc(), II,
3815 R, TInfo, SC, SCAsWritten);
3817 if (D.isInvalidType())
3818 NewVD->setInvalidDecl();
3820 if (DC->isRecord() && !CurContext->isRecord()) {
3821 // This is an out-of-line definition of a static data member.
3822 if (SC == SC_Static) {
3823 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
3824 diag::err_static_out_of_line)
3825 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
3826 } else if (SC == SC_None)
3829 if (SC == SC_Static) {
3830 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
3831 if (RD->isLocalClass())
3832 Diag(D.getIdentifierLoc(),
3833 diag::err_static_data_member_not_allowed_in_local_class)
3834 << Name << RD->getDeclName();
3836 // C++ [class.union]p1: If a union contains a static data member,
3837 // the program is ill-formed.
3839 // We also disallow static data members in anonymous structs.
3840 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName()))
3841 Diag(D.getIdentifierLoc(),
3842 diag::err_static_data_member_not_allowed_in_union_or_anon_struct)
3843 << Name << RD->isUnion();
3847 // Match up the template parameter lists with the scope specifier, then
3848 // determine whether we have a template or a template specialization.
3849 isExplicitSpecialization = false;
3850 bool Invalid = false;
3851 if (TemplateParameterList *TemplateParams
3852 = MatchTemplateParametersToScopeSpecifier(
3853 D.getDeclSpec().getSourceRange().getBegin(),
3854 D.getIdentifierLoc(),
3855 D.getCXXScopeSpec(),
3856 TemplateParamLists.get(),
3857 TemplateParamLists.size(),
3858 /*never a friend*/ false,
3859 isExplicitSpecialization,
3861 if (TemplateParams->size() > 0) {
3862 // There is no such thing as a variable template.
3863 Diag(D.getIdentifierLoc(), diag::err_template_variable)
3865 << SourceRange(TemplateParams->getTemplateLoc(),
3866 TemplateParams->getRAngleLoc());
3869 // There is an extraneous 'template<>' for this variable. Complain
3870 // about it, but allow the declaration of the variable.
3871 Diag(TemplateParams->getTemplateLoc(),
3872 diag::err_template_variable_noparams)
3874 << SourceRange(TemplateParams->getTemplateLoc(),
3875 TemplateParams->getRAngleLoc());
3879 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(),
3880 D.getIdentifierLoc(), II,
3881 R, TInfo, SC, SCAsWritten);
3883 // If this decl has an auto type in need of deduction, make a note of the
3884 // Decl so we can diagnose uses of it in its own initializer.
3885 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto &&
3886 R->getContainedAutoType())
3887 ParsingInitForAutoVars.insert(NewVD);
3889 if (D.isInvalidType() || Invalid)
3890 NewVD->setInvalidDecl();
3892 SetNestedNameSpecifier(NewVD, D);
3894 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) {
3895 NewVD->setTemplateParameterListsInfo(Context,
3896 TemplateParamLists.size(),
3897 TemplateParamLists.release());
3900 if (D.getDeclSpec().isConstexprSpecified()) {
3901 // FIXME: once we know whether there's an initializer, apply this to
3902 // static data members too.
3903 if (!NewVD->isStaticDataMember() &&
3904 !NewVD->isThisDeclarationADefinition()) {
3905 // 'constexpr' is redundant and ill-formed on a non-defining declaration
3906 // of a variable. Suggest replacing it with 'const' if appropriate.
3907 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc();
3908 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc);
3909 // If the declarator is complex, we need to move the keyword to the
3910 // innermost chunk as we switch it from 'constexpr' to 'const'.
3911 int Kind = DeclaratorChunk::Paren;
3912 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3913 Kind = D.getTypeObject(I).Kind;
3914 if (Kind != DeclaratorChunk::Paren)
3917 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) ||
3918 Kind == DeclaratorChunk::Reference)
3919 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl)
3920 << FixItHint::CreateRemoval(ConstexprRange);
3921 else if (Kind == DeclaratorChunk::Paren)
3922 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl)
3923 << FixItHint::CreateReplacement(ConstexprRange, "const");
3925 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl)
3926 << FixItHint::CreateRemoval(ConstexprRange)
3927 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const ");
3929 NewVD->setConstexpr(true);
3934 // Set the lexical context. If the declarator has a C++ scope specifier, the
3935 // lexical context will be different from the semantic context.
3936 NewVD->setLexicalDeclContext(CurContext);
3938 if (D.getDeclSpec().isThreadSpecified()) {
3939 if (NewVD->hasLocalStorage())
3940 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
3941 else if (!Context.getTargetInfo().isTLSSupported())
3942 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
3944 NewVD->setThreadSpecified(true);
3947 if (D.getDeclSpec().isModulePrivateSpecified()) {
3948 if (isExplicitSpecialization)
3949 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
3951 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
3952 else if (NewVD->hasLocalStorage())
3953 Diag(NewVD->getLocation(), diag::err_module_private_local)
3954 << 0 << NewVD->getDeclName()
3955 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
3956 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
3958 NewVD->setModulePrivate();
3961 // Handle attributes prior to checking for duplicates in MergeVarDecl
3962 ProcessDeclAttributes(S, NewVD, D);
3964 // In auto-retain/release, infer strong retension for variables of
3966 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
3967 NewVD->setInvalidDecl();
3969 // Handle GNU asm-label extension (encoded as an attribute).
3970 if (Expr *E = (Expr*)D.getAsmLabel()) {
3971 // The parser guarantees this is a string.
3972 StringLiteral *SE = cast<StringLiteral>(E);
3973 StringRef Label = SE->getString();
3974 if (S->getFnParent() != 0) {
3978 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
3981 if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
3982 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
3986 case SC_PrivateExtern:
3987 case SC_OpenCLWorkGroupLocal:
3992 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
3996 // Diagnose shadowed variables before filtering for scope.
3997 if (!D.getCXXScopeSpec().isSet())
3998 CheckShadow(S, NewVD, Previous);
4000 // Don't consider existing declarations that are in a different
4001 // scope and are out-of-semantic-context declarations (if the new
4002 // declaration has linkage).
4003 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(),
4004 isExplicitSpecialization);
4006 if (!getLangOptions().CPlusPlus) {
4007 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
4009 // Merge the decl with the existing one if appropriate.
4010 if (!Previous.empty()) {
4011 if (Previous.isSingleResult() &&
4012 isa<FieldDecl>(Previous.getFoundDecl()) &&
4013 D.getCXXScopeSpec().isSet()) {
4014 // The user tried to define a non-static data member
4015 // out-of-line (C++ [dcl.meaning]p1).
4016 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
4017 << D.getCXXScopeSpec().getRange();
4019 NewVD->setInvalidDecl();
4021 } else if (D.getCXXScopeSpec().isSet()) {
4022 // No previous declaration in the qualifying scope.
4023 Diag(D.getIdentifierLoc(), diag::err_no_member)
4024 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
4025 << D.getCXXScopeSpec().getRange();
4026 NewVD->setInvalidDecl();
4029 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
4031 // This is an explicit specialization of a static data member. Check it.
4032 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
4033 CheckMemberSpecialization(NewVD, Previous))
4034 NewVD->setInvalidDecl();
4037 // attributes declared post-definition are currently ignored
4038 // FIXME: This should be handled in attribute merging, not
4040 if (Previous.isSingleResult()) {
4041 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl());
4042 if (Def && (Def = Def->getDefinition()) &&
4043 Def != NewVD && D.hasAttributes()) {
4044 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition);
4045 Diag(Def->getLocation(), diag::note_previous_definition);
4049 // If this is a locally-scoped extern C variable, update the map of
4051 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
4052 !NewVD->isInvalidDecl())
4053 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
4055 // If there's a #pragma GCC visibility in scope, and this isn't a class
4056 // member, set the visibility of this variable.
4057 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord())
4058 AddPushedVisibilityAttribute(NewVD);
4060 MarkUnusedFileScopedDecl(NewVD);
4065 /// \brief Diagnose variable or built-in function shadowing. Implements
4068 /// This method is called whenever a VarDecl is added to a "useful"
4071 /// \param S the scope in which the shadowing name is being declared
4072 /// \param R the lookup of the name
4074 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
4075 // Return if warning is ignored.
4076 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) ==
4077 DiagnosticsEngine::Ignored)
4080 // Don't diagnose declarations at file scope.
4081 if (D->hasGlobalStorage())
4084 DeclContext *NewDC = D->getDeclContext();
4086 // Only diagnose if we're shadowing an unambiguous field or variable.
4087 if (R.getResultKind() != LookupResult::Found)
4090 NamedDecl* ShadowedDecl = R.getFoundDecl();
4091 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
4094 // Fields are not shadowed by variables in C++ static methods.
4095 if (isa<FieldDecl>(ShadowedDecl))
4096 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
4100 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
4101 if (shadowedVar->isExternC()) {
4102 // For shadowing external vars, make sure that we point to the global
4103 // declaration, not a locally scoped extern declaration.
4104 for (VarDecl::redecl_iterator
4105 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end();
4107 if (I->isFileVarDecl()) {
4113 DeclContext *OldDC = ShadowedDecl->getDeclContext();
4115 // Only warn about certain kinds of shadowing for class members.
4116 if (NewDC && NewDC->isRecord()) {
4117 // In particular, don't warn about shadowing non-class members.
4118 if (!OldDC->isRecord())
4121 // TODO: should we warn about static data members shadowing
4122 // static data members from base classes?
4124 // TODO: don't diagnose for inaccessible shadowed members.
4125 // This is hard to do perfectly because we might friend the
4126 // shadowing context, but that's just a false negative.
4129 // Determine what kind of declaration we're shadowing.
4131 if (isa<RecordDecl>(OldDC)) {
4132 if (isa<FieldDecl>(ShadowedDecl))
4135 Kind = 2; // static data member
4136 } else if (OldDC->isFileContext())
4141 DeclarationName Name = R.getLookupName();
4143 // Emit warning and note.
4144 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
4145 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
4148 /// \brief Check -Wshadow without the advantage of a previous lookup.
4149 void Sema::CheckShadow(Scope *S, VarDecl *D) {
4150 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) ==
4151 DiagnosticsEngine::Ignored)
4154 LookupResult R(*this, D->getDeclName(), D->getLocation(),
4155 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
4157 CheckShadow(S, D, R);
4160 /// \brief Perform semantic checking on a newly-created variable
4163 /// This routine performs all of the type-checking required for a
4164 /// variable declaration once it has been built. It is used both to
4165 /// check variables after they have been parsed and their declarators
4166 /// have been translated into a declaration, and to check variables
4167 /// that have been instantiated from a template.
4169 /// Sets NewVD->isInvalidDecl() if an error was encountered.
4171 /// Returns true if the variable declaration is a redeclaration.
4172 bool Sema::CheckVariableDeclaration(VarDecl *NewVD,
4173 LookupResult &Previous) {
4174 // If the decl is already known invalid, don't check it.
4175 if (NewVD->isInvalidDecl())
4178 QualType T = NewVD->getType();
4180 if (T->isObjCObjectType()) {
4181 Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
4182 << FixItHint::CreateInsertion(NewVD->getLocation(), "*");
4183 T = Context.getObjCObjectPointerType(T);
4187 // Emit an error if an address space was applied to decl with local storage.
4188 // This includes arrays of objects with address space qualifiers, but not
4189 // automatic variables that point to other address spaces.
4190 // ISO/IEC TR 18037 S5.1.2
4191 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
4192 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
4193 NewVD->setInvalidDecl();
4197 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
4198 && !NewVD->hasAttr<BlocksAttr>()) {
4199 if (getLangOptions().getGC() != LangOptions::NonGC)
4200 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
4202 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
4205 bool isVM = T->isVariablyModifiedType();
4206 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
4207 NewVD->hasAttr<BlocksAttr>())
4208 getCurFunction()->setHasBranchProtectedScope();
4210 if ((isVM && NewVD->hasLinkage()) ||
4211 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
4212 bool SizeIsNegative;
4213 llvm::APSInt Oversized;
4215 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
4218 if (FixedTy.isNull() && T->isVariableArrayType()) {
4219 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
4220 // FIXME: This won't give the correct result for
4222 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
4224 if (NewVD->isFileVarDecl())
4225 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
4227 else if (NewVD->getStorageClass() == SC_Static)
4228 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
4231 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
4233 NewVD->setInvalidDecl();
4237 if (FixedTy.isNull()) {
4238 if (NewVD->isFileVarDecl())
4239 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
4241 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
4242 NewVD->setInvalidDecl();
4246 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
4247 NewVD->setType(FixedTy);
4250 if (Previous.empty() && NewVD->isExternC()) {
4251 // Since we did not find anything by this name and we're declaring
4252 // an extern "C" variable, look for a non-visible extern "C"
4253 // declaration with the same name.
4254 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
4255 = findLocallyScopedExternalDecl(NewVD->getDeclName());
4256 if (Pos != LocallyScopedExternalDecls.end())
4257 Previous.addDecl(Pos->second);
4260 if (T->isVoidType() && !NewVD->hasExternalStorage()) {
4261 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
4263 NewVD->setInvalidDecl();
4267 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
4268 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
4269 NewVD->setInvalidDecl();
4273 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
4274 Diag(NewVD->getLocation(), diag::err_block_on_vm);
4275 NewVD->setInvalidDecl();
4279 // Function pointers and references cannot have qualified function type, only
4280 // function pointer-to-members can do that.
4282 unsigned PtrOrRef = 0;
4283 if (const PointerType *Ptr = T->getAs<PointerType>())
4284 Pointee = Ptr->getPointeeType();
4285 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) {
4286 Pointee = Ref->getPointeeType();
4289 if (!Pointee.isNull() && Pointee->isFunctionProtoType() &&
4290 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) {
4291 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer)
4293 NewVD->setInvalidDecl();
4297 if (!Previous.empty()) {
4298 MergeVarDecl(NewVD, Previous);
4304 /// \brief Data used with FindOverriddenMethod
4305 struct FindOverriddenMethodData {
4307 CXXMethodDecl *Method;
4310 /// \brief Member lookup function that determines whether a given C++
4311 /// method overrides a method in a base class, to be used with
4312 /// CXXRecordDecl::lookupInBases().
4313 static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
4316 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
4318 FindOverriddenMethodData *Data
4319 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
4321 DeclarationName Name = Data->Method->getDeclName();
4323 // FIXME: Do we care about other names here too?
4324 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
4325 // We really want to find the base class destructor here.
4326 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
4327 CanQualType CT = Data->S->Context.getCanonicalType(T);
4329 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
4332 for (Path.Decls = BaseRecord->lookup(Name);
4333 Path.Decls.first != Path.Decls.second;
4334 ++Path.Decls.first) {
4335 NamedDecl *D = *Path.Decls.first;
4336 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
4337 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
4345 /// AddOverriddenMethods - See if a method overrides any in the base classes,
4346 /// and if so, check that it's a valid override and remember it.
4347 bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
4348 // Look for virtual methods in base classes that this method might override.
4350 FindOverriddenMethodData Data;
4353 bool AddedAny = false;
4354 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
4355 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
4356 E = Paths.found_decls_end(); I != E; ++I) {
4357 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
4358 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
4359 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
4360 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
4361 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
4372 // Struct for holding all of the extra arguments needed by
4373 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
4374 struct ActOnFDArgs {
4377 MultiTemplateParamsArg TemplateParamLists;
4382 /// \brief Generate diagnostics for an invalid function redeclaration.
4384 /// This routine handles generating the diagnostic messages for an invalid
4385 /// function redeclaration, including finding possible similar declarations
4386 /// or performing typo correction if there are no previous declarations with
4389 /// Returns a NamedDecl iff typo correction was performed and substituting in
4390 /// the new declaration name does not cause new errors.
4391 static NamedDecl* DiagnoseInvalidRedeclaration(
4392 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
4393 ActOnFDArgs &ExtraArgs) {
4394 NamedDecl *Result = NULL;
4395 DeclarationName Name = NewFD->getDeclName();
4396 DeclContext *NewDC = NewFD->getDeclContext();
4397 LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
4398 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
4399 llvm::SmallVector<unsigned, 1> MismatchedParams;
4400 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches;
4401 TypoCorrection Correction;
4402 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus &&
4403 ExtraArgs.D.getDeclSpec().isFriendSpecified());
4404 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend
4405 : diag::err_member_def_does_not_match;
4407 NewFD->setInvalidDecl();
4408 SemaRef.LookupQualifiedName(Prev, NewDC);
4409 assert(!Prev.isAmbiguous() &&
4410 "Cannot have an ambiguity in previous-declaration lookup");
4411 if (!Prev.empty()) {
4412 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
4413 Func != FuncEnd; ++Func) {
4414 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
4416 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
4417 // Add 1 to the index so that 0 can mean the mismatch didn't
4418 // involve a parameter
4420 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
4421 NearMatches.push_back(std::make_pair(FD, ParamNum));
4424 // If the qualified name lookup yielded nothing, try typo correction
4425 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(),
4426 Prev.getLookupKind(), 0, 0, NewDC)) &&
4427 Correction.getCorrection() != Name) {
4429 Sema::SFINAETrap Trap(SemaRef);
4431 // Set up everything for the call to ActOnFunctionDeclarator
4432 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
4433 ExtraArgs.D.getIdentifierLoc());
4435 Previous.setLookupName(Correction.getCorrection());
4436 for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
4437 CDeclEnd = Correction.end();
4438 CDecl != CDeclEnd; ++CDecl) {
4439 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
4440 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD,
4441 MismatchedParams)) {
4442 Previous.addDecl(FD);
4445 bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
4446 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the
4447 // pieces need to verify the typo-corrected C++ declaraction and hopefully
4448 // eliminate the need for the parameter pack ExtraArgs.
4449 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D,
4450 NewFD->getDeclContext(),
4451 NewFD->getTypeSourceInfo(),
4453 ExtraArgs.TemplateParamLists,
4454 ExtraArgs.AddToScope);
4455 if (Trap.hasErrorOccurred()) {
4456 // Pretend the typo correction never occurred
4457 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
4458 ExtraArgs.D.getIdentifierLoc());
4459 ExtraArgs.D.setRedeclaration(wasRedeclaration);
4461 Previous.setLookupName(Name);
4464 for (LookupResult::iterator Func = Previous.begin(),
4465 FuncEnd = Previous.end();
4466 Func != FuncEnd; ++Func) {
4467 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func))
4468 NearMatches.push_back(std::make_pair(FD, 0));
4471 if (NearMatches.empty()) {
4472 // Ignore the correction if it didn't yield any close FunctionDecl matches
4473 Correction = TypoCorrection();
4475 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest
4476 : diag::err_member_def_does_not_match_suggest;
4481 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
4482 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions())
4483 << FixItHint::CreateReplacement(
4484 NewFD->getLocation(),
4485 Correction.getAsString(SemaRef.getLangOptions()));
4487 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
4488 << Name << NewDC << NewFD->getLocation();
4490 bool NewFDisConst = false;
4491 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
4492 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const;
4494 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator
4495 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
4496 NearMatch != NearMatchEnd; ++NearMatch) {
4497 FunctionDecl *FD = NearMatch->first;
4498 bool FDisConst = false;
4499 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
4500 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const;
4502 if (unsigned Idx = NearMatch->second) {
4503 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
4504 SemaRef.Diag(FDParam->getTypeSpecStartLoc(),
4505 diag::note_member_def_close_param_match)
4506 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType();
4507 } else if (Correction) {
4508 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl)
4509 << Correction.getQuoted(SemaRef.getLangOptions());
4510 } else if (FDisConst != NewFDisConst) {
4511 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
4512 << NewFDisConst << FD->getSourceRange().getEnd();
4514 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match);
4519 static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) {
4520 switch (D.getDeclSpec().getStorageClassSpec()) {
4521 default: llvm_unreachable("Unknown storage class!");
4522 case DeclSpec::SCS_auto:
4523 case DeclSpec::SCS_register:
4524 case DeclSpec::SCS_mutable:
4525 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4526 diag::err_typecheck_sclass_func);
4529 case DeclSpec::SCS_unspecified: break;
4530 case DeclSpec::SCS_extern: return SC_Extern;
4531 case DeclSpec::SCS_static: {
4532 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
4534 // The declaration of an identifier for a function that has
4535 // block scope shall have no explicit storage-class specifier
4536 // other than extern
4537 // See also (C++ [dcl.stc]p4).
4538 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4539 diag::err_static_block_func);
4544 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
4547 // No explicit storage class has already been returned
4551 static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
4552 DeclContext *DC, QualType &R,
4553 TypeSourceInfo *TInfo,
4554 FunctionDecl::StorageClass SC,
4555 bool &IsVirtualOkay) {
4556 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
4557 DeclarationName Name = NameInfo.getName();
4559 FunctionDecl *NewFD = 0;
4560 bool isInline = D.getDeclSpec().isInlineSpecified();
4561 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
4562 FunctionDecl::StorageClass SCAsWritten
4563 = StorageClassSpecToFunctionDeclStorageClass(SCSpec);
4565 if (!SemaRef.getLangOptions().CPlusPlus) {
4566 // Determine whether the function was written with a
4567 // prototype. This true when:
4568 // - there is a prototype in the declarator, or
4569 // - the type R of the function is some kind of typedef or other reference
4570 // to a type name (which eventually refers to a function type).
4572 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
4573 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
4575 NewFD = FunctionDecl::Create(SemaRef.Context, DC, D.getSourceRange().getBegin(),
4576 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
4578 if (D.isInvalidType())
4579 NewFD->setInvalidDecl();
4581 // Set the lexical context.
4582 NewFD->setLexicalDeclContext(SemaRef.CurContext);
4587 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
4588 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
4590 // Check that the return type is not an abstract class type.
4591 // For record types, this is done by the AbstractClassUsageDiagnoser once
4592 // the class has been completely parsed.
4593 if (!DC->isRecord() &&
4594 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(),
4595 R->getAs<FunctionType>()->getResultType(),
4596 diag::err_abstract_type_in_decl,
4597 SemaRef.AbstractReturnType))
4600 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
4601 // This is a C++ constructor declaration.
4602 assert(DC->isRecord() &&
4603 "Constructors can only be declared in a member context");
4605 R = SemaRef.CheckConstructorDeclarator(D, R, SC);
4606 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
4607 D.getSourceRange().getBegin(), NameInfo,
4608 R, TInfo, isExplicit, isInline,
4609 /*isImplicitlyDeclared=*/false,
4612 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
4613 // This is a C++ destructor declaration.
4614 if (DC->isRecord()) {
4615 R = SemaRef.CheckDestructorDeclarator(D, R, SC);
4616 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
4617 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
4618 SemaRef.Context, Record,
4619 D.getSourceRange().getBegin(),
4620 NameInfo, R, TInfo, isInline,
4621 /*isImplicitlyDeclared=*/false);
4623 // If the class is complete, then we now create the implicit exception
4624 // specification. If the class is incomplete or dependent, we can't do
4626 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() &&
4627 Record->getDefinition() && !Record->isBeingDefined() &&
4628 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
4629 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
4632 IsVirtualOkay = true;
4636 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
4639 // Create a FunctionDecl to satisfy the function definition parsing
4641 return FunctionDecl::Create(SemaRef.Context, DC,
4642 D.getSourceRange().getBegin(),
4643 D.getIdentifierLoc(), Name, R, TInfo,
4644 SC, SCAsWritten, isInline,
4645 /*hasPrototype=*/true, isConstexpr);
4648 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
4649 if (!DC->isRecord()) {
4650 SemaRef.Diag(D.getIdentifierLoc(),
4651 diag::err_conv_function_not_member);
4655 SemaRef.CheckConversionDeclarator(D, R, SC);
4656 IsVirtualOkay = true;
4657 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
4658 D.getSourceRange().getBegin(), NameInfo,
4659 R, TInfo, isInline, isExplicit,
4660 isConstexpr, SourceLocation());
4662 } else if (DC->isRecord()) {
4663 // If the name of the function is the same as the name of the record,
4664 // then this must be an invalid constructor that has a return type.
4665 // (The parser checks for a return type and makes the declarator a
4666 // constructor if it has no return type).
4667 if (Name.getAsIdentifierInfo() &&
4668 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
4669 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
4670 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
4671 << SourceRange(D.getIdentifierLoc());
4675 bool isStatic = SC == SC_Static;
4678 // Any allocation function for a class T is a static member
4679 // (even if not explicitly declared static).
4680 if (Name.getCXXOverloadedOperator() == OO_New ||
4681 Name.getCXXOverloadedOperator() == OO_Array_New)
4684 // [class.free]p6 Any deallocation function for a class X is a static member
4685 // (even if not explicitly declared static).
4686 if (Name.getCXXOverloadedOperator() == OO_Delete ||
4687 Name.getCXXOverloadedOperator() == OO_Array_Delete)
4690 IsVirtualOkay = !isStatic;
4692 // This is a C++ method declaration.
4693 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
4694 D.getSourceRange().getBegin(), NameInfo, R,
4695 TInfo, isStatic, SCAsWritten, isInline,
4696 isConstexpr, SourceLocation());
4699 // Determine whether the function was written with a
4700 // prototype. This true when:
4701 // - we're in C++ (where every function has a prototype),
4702 return FunctionDecl::Create(SemaRef.Context, DC,
4703 D.getSourceRange().getBegin(),
4704 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
4705 true/*HasPrototype*/, isConstexpr);
4710 Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
4711 TypeSourceInfo *TInfo, LookupResult &Previous,
4712 MultiTemplateParamsArg TemplateParamLists,
4714 QualType R = TInfo->getType();
4716 assert(R.getTypePtr()->isFunctionType());
4718 // TODO: consider using NameInfo for diagnostic.
4719 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
4720 DeclarationName Name = NameInfo.getName();
4721 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D);
4723 if (D.getDeclSpec().isThreadSpecified())
4724 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
4726 // Do not allow returning a objc interface by-value.
4727 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
4728 Diag(D.getIdentifierLoc(),
4729 diag::err_object_cannot_be_passed_returned_by_value) << 0
4730 << R->getAs<FunctionType>()->getResultType()
4731 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*");
4733 QualType T = R->getAs<FunctionType>()->getResultType();
4734 T = Context.getObjCObjectPointerType(T);
4735 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) {
4736 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
4737 R = Context.getFunctionType(T, FPT->arg_type_begin(),
4738 FPT->getNumArgs(), EPI);
4740 else if (isa<FunctionNoProtoType>(R))
4741 R = Context.getFunctionNoProtoType(T);
4744 bool isFriend = false;
4745 FunctionTemplateDecl *FunctionTemplate = 0;
4746 bool isExplicitSpecialization = false;
4747 bool isFunctionTemplateSpecialization = false;
4748 bool isDependentClassScopeExplicitSpecialization = false;
4749 bool isVirtualOkay = false;
4751 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
4753 if (!NewFD) return 0;
4755 if (getLangOptions().CPlusPlus) {
4756 bool isInline = D.getDeclSpec().isInlineSpecified();
4757 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
4758 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
4759 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
4760 isFriend = D.getDeclSpec().isFriendSpecified();
4761 if (isFriend && !isInline && D.isFunctionDefinition()) {
4762 // C++ [class.friend]p5
4763 // A function can be defined in a friend declaration of a
4764 // class . . . . Such a function is implicitly inline.
4765 NewFD->setImplicitlyInline();
4768 SetNestedNameSpecifier(NewFD, D);
4769 isExplicitSpecialization = false;
4770 isFunctionTemplateSpecialization = false;
4771 if (D.isInvalidType())
4772 NewFD->setInvalidDecl();
4774 // Set the lexical context. If the declarator has a C++
4775 // scope specifier, or is the object of a friend declaration, the
4776 // lexical context will be different from the semantic context.
4777 NewFD->setLexicalDeclContext(CurContext);
4779 // Match up the template parameter lists with the scope specifier, then
4780 // determine whether we have a template or a template specialization.
4781 bool Invalid = false;
4782 if (TemplateParameterList *TemplateParams
4783 = MatchTemplateParametersToScopeSpecifier(
4784 D.getDeclSpec().getSourceRange().getBegin(),
4785 D.getIdentifierLoc(),
4786 D.getCXXScopeSpec(),
4787 TemplateParamLists.get(),
4788 TemplateParamLists.size(),
4790 isExplicitSpecialization,
4792 if (TemplateParams->size() > 0) {
4793 // This is a function template
4795 // Check that we can declare a template here.
4796 if (CheckTemplateDeclScope(S, TemplateParams))
4799 // A destructor cannot be a template.
4800 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
4801 Diag(NewFD->getLocation(), diag::err_destructor_template);
4805 // If we're adding a template to a dependent context, we may need to
4806 // rebuilding some of the types used within the template parameter list,
4807 // now that we know what the current instantiation is.
4808 if (DC->isDependentContext()) {
4809 ContextRAII SavedContext(*this, DC);
4810 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
4815 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
4816 NewFD->getLocation(),
4817 Name, TemplateParams,
4819 FunctionTemplate->setLexicalDeclContext(CurContext);
4820 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
4822 // For source fidelity, store the other template param lists.
4823 if (TemplateParamLists.size() > 1) {
4824 NewFD->setTemplateParameterListsInfo(Context,
4825 TemplateParamLists.size() - 1,
4826 TemplateParamLists.release());
4829 // This is a function template specialization.
4830 isFunctionTemplateSpecialization = true;
4831 // For source fidelity, store all the template param lists.
4832 NewFD->setTemplateParameterListsInfo(Context,
4833 TemplateParamLists.size(),
4834 TemplateParamLists.release());
4836 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
4838 // We want to remove the "template<>", found here.
4839 SourceRange RemoveRange = TemplateParams->getSourceRange();
4841 // If we remove the template<> and the name is not a
4842 // template-id, we're actually silently creating a problem:
4843 // the friend declaration will refer to an untemplated decl,
4844 // and clearly the user wants a template specialization. So
4845 // we need to insert '<>' after the name.
4846 SourceLocation InsertLoc;
4847 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
4848 InsertLoc = D.getName().getSourceRange().getEnd();
4849 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
4852 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
4853 << Name << RemoveRange
4854 << FixItHint::CreateRemoval(RemoveRange)
4855 << FixItHint::CreateInsertion(InsertLoc, "<>");
4860 // All template param lists were matched against the scope specifier:
4861 // this is NOT (an explicit specialization of) a template.
4862 if (TemplateParamLists.size() > 0)
4863 // For source fidelity, store all the template param lists.
4864 NewFD->setTemplateParameterListsInfo(Context,
4865 TemplateParamLists.size(),
4866 TemplateParamLists.release());
4870 NewFD->setInvalidDecl();
4871 if (FunctionTemplate)
4872 FunctionTemplate->setInvalidDecl();
4875 // C++ [dcl.fct.spec]p5:
4876 // The virtual specifier shall only be used in declarations of
4877 // nonstatic class member functions that appear within a
4878 // member-specification of a class declaration; see 10.3.
4880 if (isVirtual && !NewFD->isInvalidDecl()) {
4881 if (!isVirtualOkay) {
4882 Diag(D.getDeclSpec().getVirtualSpecLoc(),
4883 diag::err_virtual_non_function);
4884 } else if (!CurContext->isRecord()) {
4885 // 'virtual' was specified outside of the class.
4886 Diag(D.getDeclSpec().getVirtualSpecLoc(),
4887 diag::err_virtual_out_of_class)
4888 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
4889 } else if (NewFD->getDescribedFunctionTemplate()) {
4890 // C++ [temp.mem]p3:
4891 // A member function template shall not be virtual.
4892 Diag(D.getDeclSpec().getVirtualSpecLoc(),
4893 diag::err_virtual_member_function_template)
4894 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
4896 // Okay: Add virtual to the method.
4897 NewFD->setVirtualAsWritten(true);
4901 // C++ [dcl.fct.spec]p3:
4902 // The inline specifier shall not appear on a block scope function declaration.
4903 if (isInline && !NewFD->isInvalidDecl()) {
4904 if (CurContext->isFunctionOrMethod()) {
4905 // 'inline' is not allowed on block scope function declaration.
4906 Diag(D.getDeclSpec().getInlineSpecLoc(),
4907 diag::err_inline_declaration_block_scope) << Name
4908 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
4912 // C++ [dcl.fct.spec]p6:
4913 // The explicit specifier shall be used only in the declaration of a
4914 // constructor or conversion function within its class definition; see 12.3.1
4916 if (isExplicit && !NewFD->isInvalidDecl()) {
4917 if (!CurContext->isRecord()) {
4918 // 'explicit' was specified outside of the class.
4919 Diag(D.getDeclSpec().getExplicitSpecLoc(),
4920 diag::err_explicit_out_of_class)
4921 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
4922 } else if (!isa<CXXConstructorDecl>(NewFD) &&
4923 !isa<CXXConversionDecl>(NewFD)) {
4924 // 'explicit' was specified on a function that wasn't a constructor
4925 // or conversion function.
4926 Diag(D.getDeclSpec().getExplicitSpecLoc(),
4927 diag::err_explicit_non_ctor_or_conv_function)
4928 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
4933 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors
4934 // are implicitly inline.
4935 NewFD->setImplicitlyInline();
4937 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to
4938 // be either constructors or to return a literal type. Therefore,
4939 // destructors cannot be declared constexpr.
4940 if (isa<CXXDestructorDecl>(NewFD))
4941 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
4944 // If __module_private__ was specified, mark the function accordingly.
4945 if (D.getDeclSpec().isModulePrivateSpecified()) {
4946 if (isFunctionTemplateSpecialization) {
4947 SourceLocation ModulePrivateLoc
4948 = D.getDeclSpec().getModulePrivateSpecLoc();
4949 Diag(ModulePrivateLoc, diag::err_module_private_specialization)
4951 << FixItHint::CreateRemoval(ModulePrivateLoc);
4953 NewFD->setModulePrivate();
4954 if (FunctionTemplate)
4955 FunctionTemplate->setModulePrivate();
4960 // For now, claim that the objects have no previous declaration.
4961 if (FunctionTemplate) {
4962 FunctionTemplate->setObjectOfFriendDecl(false);
4963 FunctionTemplate->setAccess(AS_public);
4965 NewFD->setObjectOfFriendDecl(false);
4966 NewFD->setAccess(AS_public);
4969 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
4970 D.isFunctionDefinition()) {
4971 // A method is implicitly inline if it's defined in its class
4973 NewFD->setImplicitlyInline();
4976 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
4977 !CurContext->isRecord()) {
4978 // C++ [class.static]p1:
4979 // A data or function member of a class may be declared static
4980 // in a class definition, in which case it is a static member of
4983 // Complain about the 'static' specifier if it's on an out-of-line
4984 // member function definition.
4985 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4986 diag::err_static_out_of_line)
4987 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
4991 // Filter out previous declarations that don't match the scope.
4992 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(),
4993 isExplicitSpecialization ||
4994 isFunctionTemplateSpecialization);
4996 // Handle GNU asm-label extension (encoded as an attribute).
4997 if (Expr *E = (Expr*) D.getAsmLabel()) {
4998 // The parser guarantees this is a string.
4999 StringLiteral *SE = cast<StringLiteral>(E);
5000 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
5004 // Copy the parameter declarations from the declarator D to the function
5005 // declaration NewFD, if they are available. First scavenge them into Params.
5006 SmallVector<ParmVarDecl*, 16> Params;
5007 if (D.isFunctionDeclarator()) {
5008 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5010 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
5011 // function that takes no arguments, not a function that takes a
5012 // single void argument.
5013 // We let through "const void" here because Sema::GetTypeForDeclarator
5014 // already checks for that case.
5015 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5016 FTI.ArgInfo[0].Param &&
5017 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
5018 // Empty arg list, don't push any params.
5019 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param);
5021 // In C++, the empty parameter-type-list must be spelled "void"; a
5022 // typedef of void is not permitted.
5023 if (getLangOptions().CPlusPlus &&
5024 Param->getType().getUnqualifiedType() != Context.VoidTy) {
5025 bool IsTypeAlias = false;
5026 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>())
5027 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl());
5028 else if (const TemplateSpecializationType *TST =
5029 Param->getType()->getAs<TemplateSpecializationType>())
5030 IsTypeAlias = TST->isTypeAlias();
5031 Diag(Param->getLocation(), diag::err_param_typedef_of_void)
5034 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
5035 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
5036 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
5037 assert(Param->getDeclContext() != NewFD && "Was set before ?");
5038 Param->setDeclContext(NewFD);
5039 Params.push_back(Param);
5041 if (Param->isInvalidDecl())
5042 NewFD->setInvalidDecl();
5046 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
5047 // When we're declaring a function with a typedef, typeof, etc as in the
5048 // following example, we'll need to synthesize (unnamed)
5049 // parameters for use in the declaration.
5052 // typedef void fn(int);
5056 // Synthesize a parameter for each argument type.
5057 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
5058 AE = FT->arg_type_end(); AI != AE; ++AI) {
5059 ParmVarDecl *Param =
5060 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
5061 Param->setScopeInfo(0, Params.size());
5062 Params.push_back(Param);
5065 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
5066 "Should not need args for typedef of non-prototype fn");
5069 // Finally, we know we have the right number of parameters, install them.
5070 NewFD->setParams(Params);
5072 // Process the non-inheritable attributes on this declaration.
5073 ProcessDeclAttributes(S, NewFD, D,
5074 /*NonInheritable=*/true, /*Inheritable=*/false);
5076 if (!getLangOptions().CPlusPlus) {
5077 // Perform semantic checking on the function declaration.
5078 bool isExplicitSpecialization=false;
5079 if (!NewFD->isInvalidDecl()) {
5080 if (NewFD->getResultType()->isVariablyModifiedType()) {
5081 // Functions returning a variably modified type violate C99 6.7.5.2p2
5082 // because all functions have linkage.
5083 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
5084 NewFD->setInvalidDecl();
5086 if (NewFD->isMain())
5087 CheckMain(NewFD, D.getDeclSpec());
5088 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
5089 isExplicitSpecialization));
5092 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
5093 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
5094 "previous declaration set still overloaded");
5096 // If the declarator is a template-id, translate the parser's template
5097 // argument list into our AST format.
5098 bool HasExplicitTemplateArgs = false;
5099 TemplateArgumentListInfo TemplateArgs;
5100 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
5101 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
5102 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
5103 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
5104 ASTTemplateArgsPtr TemplateArgsPtr(*this,
5105 TemplateId->getTemplateArgs(),
5106 TemplateId->NumArgs);
5107 translateTemplateArguments(TemplateArgsPtr,
5109 TemplateArgsPtr.release();
5111 HasExplicitTemplateArgs = true;
5113 if (NewFD->isInvalidDecl()) {
5114 HasExplicitTemplateArgs = false;
5115 } else if (FunctionTemplate) {
5116 // Function template with explicit template arguments.
5117 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
5118 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
5120 HasExplicitTemplateArgs = false;
5121 } else if (!isFunctionTemplateSpecialization &&
5122 !D.getDeclSpec().isFriendSpecified()) {
5123 // We have encountered something that the user meant to be a
5124 // specialization (because it has explicitly-specified template
5125 // arguments) but that was not introduced with a "template<>" (or had
5126 // too few of them).
5127 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
5128 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
5129 << FixItHint::CreateInsertion(
5130 D.getDeclSpec().getSourceRange().getBegin(),
5132 isFunctionTemplateSpecialization = true;
5134 // "friend void foo<>(int);" is an implicit specialization decl.
5135 isFunctionTemplateSpecialization = true;
5137 } else if (isFriend && isFunctionTemplateSpecialization) {
5138 // This combination is only possible in a recovery case; the user
5139 // wrote something like:
5140 // template <> friend void foo(int);
5141 // which we're recovering from as if the user had written:
5142 // friend void foo<>(int);
5143 // Go ahead and fake up a template id.
5144 HasExplicitTemplateArgs = true;
5145 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
5146 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
5149 // If it's a friend (and only if it's a friend), it's possible
5150 // that either the specialized function type or the specialized
5151 // template is dependent, and therefore matching will fail. In
5152 // this case, don't check the specialization yet.
5153 bool InstantiationDependent = false;
5154 if (isFunctionTemplateSpecialization && isFriend &&
5155 (NewFD->getType()->isDependentType() || DC->isDependentContext() ||
5156 TemplateSpecializationType::anyDependentTemplateArguments(
5157 TemplateArgs.getArgumentArray(), TemplateArgs.size(),
5158 InstantiationDependent))) {
5159 assert(HasExplicitTemplateArgs &&
5160 "friend function specialization without template args");
5161 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
5163 NewFD->setInvalidDecl();
5164 } else if (isFunctionTemplateSpecialization) {
5165 if (CurContext->isDependentContext() && CurContext->isRecord()
5167 isDependentClassScopeExplicitSpecialization = true;
5168 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ?
5169 diag::ext_function_specialization_in_class :
5170 diag::err_function_specialization_in_class)
5171 << NewFD->getDeclName();
5172 } else if (CheckFunctionTemplateSpecialization(NewFD,
5173 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
5175 NewFD->setInvalidDecl();
5178 // A storage-class-specifier shall not be specified in an explicit
5179 // specialization (14.7.3)
5180 if (SC != SC_None) {
5181 if (SC != NewFD->getStorageClass())
5182 Diag(NewFD->getLocation(),
5183 diag::err_explicit_specialization_inconsistent_storage_class)
5185 << FixItHint::CreateRemoval(
5186 D.getDeclSpec().getStorageClassSpecLoc());
5189 Diag(NewFD->getLocation(),
5190 diag::ext_explicit_specialization_storage_class)
5191 << FixItHint::CreateRemoval(
5192 D.getDeclSpec().getStorageClassSpecLoc());
5195 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
5196 if (CheckMemberSpecialization(NewFD, Previous))
5197 NewFD->setInvalidDecl();
5200 // Perform semantic checking on the function declaration.
5201 if (!isDependentClassScopeExplicitSpecialization) {
5202 if (NewFD->isInvalidDecl()) {
5203 // If this is a class member, mark the class invalid immediately.
5204 // This avoids some consistency errors later.
5205 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD))
5206 methodDecl->getParent()->setInvalidDecl();
5208 if (NewFD->isMain())
5209 CheckMain(NewFD, D.getDeclSpec());
5210 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
5211 isExplicitSpecialization));
5215 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
5216 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
5217 "previous declaration set still overloaded");
5219 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() &&
5220 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration))
5221 NewFD->setInvalidDecl();
5223 NamedDecl *PrincipalDecl = (FunctionTemplate
5224 ? cast<NamedDecl>(FunctionTemplate)
5227 if (isFriend && D.isRedeclaration()) {
5228 AccessSpecifier Access = AS_public;
5229 if (!NewFD->isInvalidDecl())
5230 Access = NewFD->getPreviousDeclaration()->getAccess();
5232 NewFD->setAccess(Access);
5233 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
5235 PrincipalDecl->setObjectOfFriendDecl(true);
5238 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
5239 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
5240 PrincipalDecl->setNonMemberOperator();
5242 // If we have a function template, check the template parameter
5243 // list. This will check and merge default template arguments.
5244 if (FunctionTemplate) {
5245 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration();
5246 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
5247 PrevTemplate? PrevTemplate->getTemplateParameters() : 0,
5248 D.getDeclSpec().isFriendSpecified()
5249 ? (D.isFunctionDefinition()
5250 ? TPC_FriendFunctionTemplateDefinition
5251 : TPC_FriendFunctionTemplate)
5252 : (D.getCXXScopeSpec().isSet() &&
5253 DC && DC->isRecord() &&
5254 DC->isDependentContext())
5255 ? TPC_ClassTemplateMember
5256 : TPC_FunctionTemplate);
5259 if (NewFD->isInvalidDecl()) {
5260 // Ignore all the rest of this.
5261 } else if (!D.isRedeclaration()) {
5262 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
5264 // Fake up an access specifier if it's supposed to be a class member.
5265 if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
5266 NewFD->setAccess(AS_public);
5268 // Qualified decls generally require a previous declaration.
5269 if (D.getCXXScopeSpec().isSet()) {
5270 // ...with the major exception of templated-scope or
5271 // dependent-scope friend declarations.
5273 // TODO: we currently also suppress this check in dependent
5274 // contexts because (1) the parameter depth will be off when
5275 // matching friend templates and (2) we might actually be
5276 // selecting a friend based on a dependent factor. But there
5277 // are situations where these conditions don't apply and we
5278 // can actually do this check immediately.
5280 (TemplateParamLists.size() ||
5281 D.getCXXScopeSpec().getScopeRep()->isDependent() ||
5282 CurContext->isDependentContext())) {
5285 // The user tried to provide an out-of-line definition for a
5286 // function that is a member of a class or namespace, but there
5287 // was no such member function declared (C++ [class.mfct]p2,
5288 // C++ [namespace.memdef]p2). For example:
5294 // void X::f() { } // ill-formed
5296 // Complain about this problem, and attempt to suggest close
5297 // matches (e.g., those that differ only in cv-qualifiers and
5298 // whether the parameter types are references).
5300 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
5303 AddToScope = ExtraArgs.AddToScope;
5308 // Unqualified local friend declarations are required to resolve
5310 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
5311 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
5314 AddToScope = ExtraArgs.AddToScope;
5319 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() &&
5320 !isFriend && !isFunctionTemplateSpecialization &&
5321 !isExplicitSpecialization) {
5322 // An out-of-line member function declaration must also be a
5323 // definition (C++ [dcl.meaning]p1).
5324 // Note that this is not the case for explicit specializations of
5325 // function templates or member functions of class templates, per
5326 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension
5327 // for compatibility with old SWIG code which likes to generate them.
5328 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
5329 << D.getCXXScopeSpec().getRange();
5334 // Handle attributes. We need to have merged decls when handling attributes
5335 // (for example to check for conflicts, etc).
5336 // FIXME: This needs to happen before we merge declarations. Then,
5337 // let attribute merging cope with attribute conflicts.
5338 ProcessDeclAttributes(S, NewFD, D,
5339 /*NonInheritable=*/false, /*Inheritable=*/true);
5341 // attributes declared post-definition are currently ignored
5342 // FIXME: This should happen during attribute merging
5343 if (D.isRedeclaration() && Previous.isSingleResult()) {
5344 const FunctionDecl *Def;
5345 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl());
5346 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) {
5347 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition);
5348 Diag(Def->getLocation(), diag::note_previous_definition);
5352 AddKnownFunctionAttributes(NewFD);
5354 if (NewFD->hasAttr<OverloadableAttr>() &&
5355 !NewFD->getType()->getAs<FunctionProtoType>()) {
5356 Diag(NewFD->getLocation(),
5357 diag::err_attribute_overloadable_no_prototype)
5360 // Turn this into a variadic function with no parameters.
5361 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
5362 FunctionProtoType::ExtProtoInfo EPI;
5363 EPI.Variadic = true;
5364 EPI.ExtInfo = FT->getExtInfo();
5366 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI);
5370 // If there's a #pragma GCC visibility in scope, and this isn't a class
5371 // member, set the visibility of this function.
5372 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord())
5373 AddPushedVisibilityAttribute(NewFD);
5375 // If there's a #pragma clang arc_cf_code_audited in scope, consider
5376 // marking the function.
5377 AddCFAuditedAttribute(NewFD);
5379 // If this is a locally-scoped extern C function, update the
5380 // map of such names.
5381 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
5382 && !NewFD->isInvalidDecl())
5383 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
5385 // Set this FunctionDecl's range up to the right paren.
5386 NewFD->setRangeEnd(D.getSourceRange().getEnd());
5388 if (getLangOptions().CPlusPlus) {
5389 if (FunctionTemplate) {
5390 if (NewFD->isInvalidDecl())
5391 FunctionTemplate->setInvalidDecl();
5392 return FunctionTemplate;
5396 MarkUnusedFileScopedDecl(NewFD);
5398 if (getLangOptions().CUDA)
5399 if (IdentifierInfo *II = NewFD->getIdentifier())
5400 if (!NewFD->isInvalidDecl() &&
5401 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
5402 if (II->isStr("cudaConfigureCall")) {
5403 if (!R->getAs<FunctionType>()->getResultType()->isScalarType())
5404 Diag(NewFD->getLocation(), diag::err_config_scalar_return);
5406 Context.setcudaConfigureCallDecl(NewFD);
5410 // Here we have an function template explicit specialization at class scope.
5411 // The actually specialization will be postponed to template instatiation
5412 // time via the ClassScopeFunctionSpecializationDecl node.
5413 if (isDependentClassScopeExplicitSpecialization) {
5414 ClassScopeFunctionSpecializationDecl *NewSpec =
5415 ClassScopeFunctionSpecializationDecl::Create(
5416 Context, CurContext, SourceLocation(),
5417 cast<CXXMethodDecl>(NewFD));
5418 CurContext->addDecl(NewSpec);
5425 /// \brief Perform semantic checking of a new function declaration.
5427 /// Performs semantic analysis of the new function declaration
5428 /// NewFD. This routine performs all semantic checking that does not
5429 /// require the actual declarator involved in the declaration, and is
5430 /// used both for the declaration of functions as they are parsed
5431 /// (called via ActOnDeclarator) and for the declaration of functions
5432 /// that have been instantiated via C++ template instantiation (called
5433 /// via InstantiateDecl).
5435 /// \param IsExplicitSpecialiation whether this new function declaration is
5436 /// an explicit specialization of the previous declaration.
5438 /// This sets NewFD->isInvalidDecl() to true if there was an error.
5440 /// Returns true if the function declaration is a redeclaration.
5441 bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
5442 LookupResult &Previous,
5443 bool IsExplicitSpecialization) {
5444 assert(!NewFD->getResultType()->isVariablyModifiedType()
5445 && "Variably modified return types are not handled here");
5447 // Check for a previous declaration of this name.
5448 if (Previous.empty() && NewFD->isExternC()) {
5449 // Since we did not find anything by this name and we're declaring
5450 // an extern "C" function, look for a non-visible extern "C"
5451 // declaration with the same name.
5452 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
5453 = findLocallyScopedExternalDecl(NewFD->getDeclName());
5454 if (Pos != LocallyScopedExternalDecls.end())
5455 Previous.addDecl(Pos->second);
5458 bool Redeclaration = false;
5460 // Merge or overload the declaration with an existing declaration of
5461 // the same name, if appropriate.
5462 if (!Previous.empty()) {
5463 // Determine whether NewFD is an overload of PrevDecl or
5464 // a declaration that requires merging. If it's an overload,
5465 // there's no more work to do here; we'll just add the new
5466 // function to the scope.
5468 NamedDecl *OldDecl = 0;
5469 if (!AllowOverloadingOfFunction(Previous, Context)) {
5470 Redeclaration = true;
5471 OldDecl = Previous.getFoundDecl();
5473 switch (CheckOverload(S, NewFD, Previous, OldDecl,
5474 /*NewIsUsingDecl*/ false)) {
5476 Redeclaration = true;
5479 case Ovl_NonFunction:
5480 Redeclaration = true;
5484 Redeclaration = false;
5488 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
5489 // If a function name is overloadable in C, then every function
5490 // with that name must be marked "overloadable".
5491 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
5492 << Redeclaration << NewFD;
5493 NamedDecl *OverloadedDecl = 0;
5495 OverloadedDecl = OldDecl;
5496 else if (!Previous.empty())
5497 OverloadedDecl = Previous.getRepresentativeDecl();
5499 Diag(OverloadedDecl->getLocation(),
5500 diag::note_attribute_overloadable_prev_overload);
5501 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(),
5506 if (Redeclaration) {
5507 // NewFD and OldDecl represent declarations that need to be
5509 if (MergeFunctionDecl(NewFD, OldDecl)) {
5510 NewFD->setInvalidDecl();
5511 return Redeclaration;
5515 Previous.addDecl(OldDecl);
5517 if (FunctionTemplateDecl *OldTemplateDecl
5518 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
5519 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
5520 FunctionTemplateDecl *NewTemplateDecl
5521 = NewFD->getDescribedFunctionTemplate();
5522 assert(NewTemplateDecl && "Template/non-template mismatch");
5523 if (CXXMethodDecl *Method
5524 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
5525 Method->setAccess(OldTemplateDecl->getAccess());
5526 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
5529 // If this is an explicit specialization of a member that is a function
5530 // template, mark it as a member specialization.
5531 if (IsExplicitSpecialization &&
5532 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
5533 NewTemplateDecl->setMemberSpecialization();
5534 assert(OldTemplateDecl->isMemberSpecialization());
5537 if (OldTemplateDecl->isModulePrivate())
5538 NewTemplateDecl->setModulePrivate();
5541 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
5542 NewFD->setAccess(OldDecl->getAccess());
5543 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
5548 // Semantic checking for this function declaration (in isolation).
5549 if (getLangOptions().CPlusPlus) {
5550 // C++-specific checks.
5551 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
5552 CheckConstructor(Constructor);
5553 } else if (CXXDestructorDecl *Destructor =
5554 dyn_cast<CXXDestructorDecl>(NewFD)) {
5555 CXXRecordDecl *Record = Destructor->getParent();
5556 QualType ClassType = Context.getTypeDeclType(Record);
5558 // FIXME: Shouldn't we be able to perform this check even when the class
5559 // type is dependent? Both gcc and edg can handle that.
5560 if (!ClassType->isDependentType()) {
5561 DeclarationName Name
5562 = Context.DeclarationNames.getCXXDestructorName(
5563 Context.getCanonicalType(ClassType));
5564 if (NewFD->getDeclName() != Name) {
5565 Diag(NewFD->getLocation(), diag::err_destructor_name);
5566 NewFD->setInvalidDecl();
5567 return Redeclaration;
5570 } else if (CXXConversionDecl *Conversion
5571 = dyn_cast<CXXConversionDecl>(NewFD)) {
5572 ActOnConversionDeclarator(Conversion);
5575 // Find any virtual functions that this function overrides.
5576 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
5577 if (!Method->isFunctionTemplateSpecialization() &&
5578 !Method->getDescribedFunctionTemplate()) {
5579 if (AddOverriddenMethods(Method->getParent(), Method)) {
5580 // If the function was marked as "static", we have a problem.
5581 if (NewFD->getStorageClass() == SC_Static) {
5582 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual)
5583 << NewFD->getDeclName();
5584 for (CXXMethodDecl::method_iterator
5585 Overridden = Method->begin_overridden_methods(),
5586 OverriddenEnd = Method->end_overridden_methods();
5587 Overridden != OverriddenEnd;
5589 Diag((*Overridden)->getLocation(),
5590 diag::note_overridden_virtual_function);
5597 // Extra checking for C++ overloaded operators (C++ [over.oper]).
5598 if (NewFD->isOverloadedOperator() &&
5599 CheckOverloadedOperatorDeclaration(NewFD)) {
5600 NewFD->setInvalidDecl();
5601 return Redeclaration;
5604 // Extra checking for C++0x literal operators (C++0x [over.literal]).
5605 if (NewFD->getLiteralIdentifier() &&
5606 CheckLiteralOperatorDeclaration(NewFD)) {
5607 NewFD->setInvalidDecl();
5608 return Redeclaration;
5611 // In C++, check default arguments now that we have merged decls. Unless
5612 // the lexical context is the class, because in this case this is done
5613 // during delayed parsing anyway.
5614 if (!CurContext->isRecord())
5615 CheckCXXDefaultArguments(NewFD);
5617 // If this function declares a builtin function, check the type of this
5618 // declaration against the expected type for the builtin.
5619 if (unsigned BuiltinID = NewFD->getBuiltinID()) {
5620 ASTContext::GetBuiltinTypeError Error;
5621 QualType T = Context.GetBuiltinType(BuiltinID, Error);
5622 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) {
5623 // The type of this function differs from the type of the builtin,
5624 // so forget about the builtin entirely.
5625 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents);
5629 return Redeclaration;
5632 void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
5633 // C++ [basic.start.main]p3: A program that declares main to be inline
5634 // or static is ill-formed.
5635 // C99 6.7.4p4: In a hosted environment, the inline function specifier
5636 // shall not appear in a declaration of main.
5637 // static main is not an error under C99, but we should warn about it.
5638 if (FD->getStorageClass() == SC_Static)
5639 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus
5640 ? diag::err_static_main : diag::warn_static_main)
5641 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
5642 if (FD->isInlineSpecified())
5643 Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
5644 << FixItHint::CreateRemoval(DS.getInlineSpecLoc());
5646 QualType T = FD->getType();
5647 assert(T->isFunctionType() && "function decl is not of function type");
5648 const FunctionType* FT = T->getAs<FunctionType>();
5650 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
5651 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
5652 FD->setInvalidDecl(true);
5655 // Treat protoless main() as nullary.
5656 if (isa<FunctionNoProtoType>(FT)) return;
5658 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
5659 unsigned nparams = FTP->getNumArgs();
5660 assert(FD->getNumParams() == nparams);
5662 bool HasExtraParameters = (nparams > 3);
5664 // Darwin passes an undocumented fourth argument of type char**. If
5665 // other platforms start sprouting these, the logic below will start
5667 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
5668 HasExtraParameters = false;
5670 if (HasExtraParameters) {
5671 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
5672 FD->setInvalidDecl(true);
5676 // FIXME: a lot of the following diagnostics would be improved
5677 // if we had some location information about types.
5680 Context.getPointerType(Context.getPointerType(Context.CharTy));
5681 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
5683 for (unsigned i = 0; i < nparams; ++i) {
5684 QualType AT = FTP->getArgType(i);
5686 bool mismatch = true;
5688 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
5690 else if (Expected[i] == CharPP) {
5691 // As an extension, the following forms are okay:
5693 // char const * const *
5696 QualifierCollector qs;
5697 const PointerType* PT;
5698 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
5699 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
5700 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
5702 mismatch = !qs.empty();
5707 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
5708 // TODO: suggest replacing given type with expected type
5709 FD->setInvalidDecl(true);
5713 if (nparams == 1 && !FD->isInvalidDecl()) {
5714 Diag(FD->getLocation(), diag::warn_main_one_arg);
5717 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
5718 Diag(FD->getLocation(), diag::err_main_template_decl);
5719 FD->setInvalidDecl();
5723 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
5724 // FIXME: Need strict checking. In C89, we need to check for
5725 // any assignment, increment, decrement, function-calls, or
5726 // commas outside of a sizeof. In C99, it's the same list,
5727 // except that the aforementioned are allowed in unevaluated
5728 // expressions. Everything else falls under the
5729 // "may accept other forms of constant expressions" exception.
5730 // (We never end up here for C++, so the constant expression
5731 // rules there don't matter.)
5732 if (Init->isConstantInitializer(Context, false))
5734 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
5735 << Init->getSourceRange();
5740 // Visits an initialization expression to see if OrigDecl is evaluated in
5741 // its own initialization and throws a warning if it does.
5742 class SelfReferenceChecker
5743 : public EvaluatedExprVisitor<SelfReferenceChecker> {
5750 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
5752 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
5753 S(S), OrigDecl(OrigDecl) {
5755 isRecordType = false;
5756 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
5757 isPODType = VD->getType().isPODType(S.Context);
5758 isRecordType = VD->getType()->isRecordType();
5762 void VisitExpr(Expr *E) {
5763 if (isa<ObjCMessageExpr>(*E)) return;
5766 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
5767 ValueDecl *VD = ME->getMemberDecl();
5768 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return;
5769 expr = ME->getBase();
5771 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) {
5772 HandleDeclRefExpr(DRE);
5776 Inherited::VisitExpr(E);
5779 void VisitMemberExpr(MemberExpr *E) {
5780 if (E->getType()->canDecayToPointerType()) return;
5781 if (isa<FieldDecl>(E->getMemberDecl()))
5782 if (DeclRefExpr *DRE
5783 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) {
5784 HandleDeclRefExpr(DRE);
5787 Inherited::VisitMemberExpr(E);
5790 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
5791 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) ||
5792 (isRecordType && E->getCastKind() == CK_NoOp)) {
5793 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts();
5794 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr))
5795 SubExpr = ME->getBase()->IgnoreParenImpCasts();
5796 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) {
5797 HandleDeclRefExpr(DRE);
5801 Inherited::VisitImplicitCastExpr(E);
5804 void VisitUnaryOperator(UnaryOperator *E) {
5805 // For POD record types, addresses of its own members are well-defined.
5806 if (isRecordType && isPODType) return;
5807 Inherited::VisitUnaryOperator(E);
5810 void HandleDeclRefExpr(DeclRefExpr *DRE) {
5811 Decl* ReferenceDecl = DRE->getDecl();
5812 if (OrigDecl != ReferenceDecl) return;
5813 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName,
5814 Sema::NotForRedeclaration);
5815 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
5816 S.PDiag(diag::warn_uninit_self_reference_in_init)
5817 << Result.getLookupName()
5818 << OrigDecl->getLocation()
5819 << DRE->getSourceRange());
5824 /// CheckSelfReference - Warns if OrigDecl is used in expression E.
5825 void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) {
5826 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E);
5829 /// AddInitializerToDecl - Adds the initializer Init to the
5830 /// declaration dcl. If DirectInit is true, this is C++ direct
5831 /// initialization rather than copy initialization.
5832 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
5833 bool DirectInit, bool TypeMayContainAuto) {
5834 // If there is no declaration, there was an error parsing it. Just ignore
5836 if (RealDecl == 0 || RealDecl->isInvalidDecl())
5839 // Check for self-references within variable initializers.
5840 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) {
5841 // Variables declared within a function/method body are handled
5842 // by a dataflow analysis.
5843 if (!vd->hasLocalStorage() && !vd->isStaticLocal())
5844 CheckSelfReference(RealDecl, Init);
5847 CheckSelfReference(RealDecl, Init);
5850 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
5851 // With declarators parsed the way they are, the parser cannot
5852 // distinguish between a normal initializer and a pure-specifier.
5853 // Thus this grotesque test.
5855 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
5856 Context.getCanonicalType(IL->getType()) == Context.IntTy)
5857 CheckPureMethod(Method, Init->getSourceRange());
5859 Diag(Method->getLocation(), diag::err_member_function_initialization)
5860 << Method->getDeclName() << Init->getSourceRange();
5861 Method->setInvalidDecl();
5866 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
5868 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
5869 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
5870 RealDecl->setInvalidDecl();
5874 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
5875 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) {
5876 TypeSourceInfo *DeducedType = 0;
5877 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType))
5878 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure)
5879 << VDecl->getDeclName() << VDecl->getType() << Init->getType()
5880 << Init->getSourceRange();
5882 RealDecl->setInvalidDecl();
5885 VDecl->setTypeSourceInfo(DeducedType);
5886 VDecl->setType(DeducedType->getType());
5888 // In ARC, infer lifetime.
5889 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
5890 VDecl->setInvalidDecl();
5892 // If this is a redeclaration, check that the type we just deduced matches
5893 // the previously declared type.
5894 if (VarDecl *Old = VDecl->getPreviousDeclaration())
5895 MergeVarDeclTypes(VDecl, Old);
5899 // A definition must end up with a complete type, which means it must be
5900 // complete with the restriction that an array type might be completed by the
5901 // initializer; note that later code assumes this restriction.
5902 QualType BaseDeclType = VDecl->getType();
5903 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
5904 BaseDeclType = Array->getElementType();
5905 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
5906 diag::err_typecheck_decl_incomplete_type)) {
5907 RealDecl->setInvalidDecl();
5911 // The variable can not have an abstract class type.
5912 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
5913 diag::err_abstract_type_in_decl,
5914 AbstractVariableType))
5915 VDecl->setInvalidDecl();
5918 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
5919 Diag(VDecl->getLocation(), diag::err_redefinition)
5920 << VDecl->getDeclName();
5921 Diag(Def->getLocation(), diag::note_previous_definition);
5922 VDecl->setInvalidDecl();
5926 const VarDecl* PrevInit = 0;
5927 if (getLangOptions().CPlusPlus) {
5928 // C++ [class.static.data]p4
5929 // If a static data member is of const integral or const
5930 // enumeration type, its declaration in the class definition can
5931 // specify a constant-initializer which shall be an integral
5932 // constant expression (5.19). In that case, the member can appear
5933 // in integral constant expressions. The member shall still be
5934 // defined in a namespace scope if it is used in the program and the
5935 // namespace scope definition shall not contain an initializer.
5937 // We already performed a redefinition check above, but for static
5938 // data members we also need to check whether there was an in-class
5939 // declaration with an initializer.
5940 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
5941 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName();
5942 Diag(PrevInit->getLocation(), diag::note_previous_definition);
5946 if (VDecl->hasLocalStorage())
5947 getCurFunction()->setHasBranchProtectedScope();
5949 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
5950 VDecl->setInvalidDecl();
5955 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
5956 // a kernel function cannot be initialized."
5957 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) {
5958 Diag(VDecl->getLocation(), diag::err_local_cant_init);
5959 VDecl->setInvalidDecl();
5963 // Capture the variable that is being initialized and the style of
5965 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
5967 // FIXME: Poor source location information.
5968 InitializationKind Kind
5969 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
5970 Init->getLocStart(),
5972 : InitializationKind::CreateCopy(VDecl->getLocation(),
5973 Init->getLocStart());
5975 // Get the decls type and save a reference for later, since
5976 // CheckInitializerTypes may change it.
5977 QualType DclT = VDecl->getType(), SavT = DclT;
5978 if (VDecl->isLocalVarDecl()) {
5979 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5
5980 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
5981 VDecl->setInvalidDecl();
5982 } else if (!VDecl->isInvalidDecl()) {
5983 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
5984 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
5985 MultiExprArg(*this, &Init, 1),
5987 if (Result.isInvalid()) {
5988 VDecl->setInvalidDecl();
5992 Init = Result.takeAs<Expr>();
5994 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
5995 // Don't check invalid declarations to avoid emitting useless diagnostics.
5996 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
5997 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4.
5998 CheckForConstantInitializer(Init, DclT);
6001 } else if (VDecl->isStaticDataMember() &&
6002 VDecl->getLexicalDeclContext()->isRecord()) {
6003 // This is an in-class initialization for a static data member, e.g.,
6006 // static const int value = 17;
6009 // Try to perform the initialization regardless.
6010 if (!VDecl->isInvalidDecl()) {
6011 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
6012 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
6013 MultiExprArg(*this, &Init, 1),
6015 if (Result.isInvalid()) {
6016 VDecl->setInvalidDecl();
6020 Init = Result.takeAs<Expr>();
6023 // C++ [class.mem]p4:
6024 // A member-declarator can contain a constant-initializer only
6025 // if it declares a static member (9.4) of const integral or
6026 // const enumeration type, see 9.4.2.
6028 // C++0x [class.static.data]p3:
6029 // If a non-volatile const static data member is of integral or
6030 // enumeration type, its declaration in the class definition can
6031 // specify a brace-or-equal-initializer in which every initalizer-clause
6032 // that is an assignment-expression is a constant expression. A static
6033 // data member of literal type can be declared in the class definition
6034 // with the constexpr specifier; if so, its declaration shall specify a
6035 // brace-or-equal-initializer in which every initializer-clause that is
6036 // an assignment-expression is a constant expression.
6037 QualType T = VDecl->getType();
6039 // Do nothing on dependent types.
6040 if (T->isDependentType()) {
6042 // Allow any 'static constexpr' members, whether or not they are of literal
6043 // type. We separately check that the initializer is a constant expression,
6044 // which implicitly requires the member to be of literal type.
6045 } else if (VDecl->isConstexpr()) {
6047 // Require constness.
6048 } else if (!T.isConstQualified()) {
6049 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
6050 << Init->getSourceRange();
6051 VDecl->setInvalidDecl();
6053 // We allow integer constant expressions in all cases.
6054 } else if (T->isIntegralOrEnumerationType()) {
6055 // Check whether the expression is a constant expression.
6057 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified())
6058 // In C++0x, a non-constexpr const static data member with an
6059 // in-class initializer cannot be volatile.
6060 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
6061 else if (Init->isValueDependent())
6062 ; // Nothing to check.
6063 else if (Init->isIntegerConstantExpr(Context, &Loc))
6064 ; // Ok, it's an ICE!
6065 else if (Init->isEvaluatable(Context)) {
6066 // If we can constant fold the initializer through heroics, accept it,
6067 // but report this as a use of an extension for -pedantic.
6068 Diag(Loc, diag::ext_in_class_initializer_non_constant)
6069 << Init->getSourceRange();
6071 // Otherwise, this is some crazy unknown case. Report the issue at the
6072 // location provided by the isIntegerConstantExpr failed check.
6073 Diag(Loc, diag::err_in_class_initializer_non_constant)
6074 << Init->getSourceRange();
6075 VDecl->setInvalidDecl();
6078 // We allow floating-point constants as an extension.
6079 } else if (T->isFloatingType()) { // also permits complex, which is ok
6080 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
6081 << T << Init->getSourceRange();
6082 if (getLangOptions().CPlusPlus0x)
6083 Diag(VDecl->getLocation(),
6084 diag::note_in_class_initializer_float_type_constexpr)
6085 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
6087 if (!Init->isValueDependent() &&
6088 !Init->isConstantInitializer(Context, false)) {
6089 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
6090 << Init->getSourceRange();
6091 VDecl->setInvalidDecl();
6094 // Suggest adding 'constexpr' in C++0x for literal types.
6095 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) {
6096 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
6097 << T << Init->getSourceRange()
6098 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
6099 VDecl->setConstexpr(true);
6102 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
6103 << T << Init->getSourceRange();
6104 VDecl->setInvalidDecl();
6106 } else if (VDecl->isFileVarDecl()) {
6107 if (VDecl->getStorageClassAsWritten() == SC_Extern &&
6108 (!getLangOptions().CPlusPlus ||
6109 !Context.getBaseElementType(VDecl->getType()).isConstQualified()))
6110 Diag(VDecl->getLocation(), diag::warn_extern_init);
6111 if (!VDecl->isInvalidDecl()) {
6112 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
6113 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
6114 MultiExprArg(*this, &Init, 1),
6116 if (Result.isInvalid()) {
6117 VDecl->setInvalidDecl();
6121 Init = Result.takeAs<Expr>();
6124 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
6125 // Don't check invalid declarations to avoid emitting useless diagnostics.
6126 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
6127 // C99 6.7.8p4. All file scoped initializers need to be constant.
6128 CheckForConstantInitializer(Init, DclT);
6131 // If the type changed, it means we had an incomplete type that was
6132 // completed by the initializer. For example:
6133 // int ary[] = { 1, 3, 5 };
6134 // "ary" transitions from a VariableArrayType to a ConstantArrayType.
6135 if (!VDecl->isInvalidDecl() && (DclT != SavT)) {
6136 VDecl->setType(DclT);
6137 Init->setType(DclT);
6140 // Check any implicit conversions within the expression.
6141 CheckImplicitConversions(Init, VDecl->getLocation());
6143 if (!VDecl->isInvalidDecl())
6144 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
6146 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() &&
6147 !VDecl->getType()->isDependentType() &&
6148 !Init->isTypeDependent() && !Init->isValueDependent() &&
6149 !Init->isConstantInitializer(Context,
6150 VDecl->getType()->isReferenceType())) {
6151 // FIXME: Improve this diagnostic to explain why the initializer is not
6152 // a constant expression.
6153 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init)
6154 << VDecl << Init->getSourceRange();
6157 Init = MaybeCreateExprWithCleanups(Init);
6158 // Attach the initializer to the decl.
6159 VDecl->setInit(Init);
6161 CheckCompleteVariableDeclaration(VDecl);
6164 /// ActOnInitializerError - Given that there was an error parsing an
6165 /// initializer for the given declaration, try to return to some form
6167 void Sema::ActOnInitializerError(Decl *D) {
6168 // Our main concern here is re-establishing invariants like "a
6169 // variable's type is either dependent or complete".
6170 if (!D || D->isInvalidDecl()) return;
6172 VarDecl *VD = dyn_cast<VarDecl>(D);
6175 // Auto types are meaningless if we can't make sense of the initializer.
6176 if (ParsingInitForAutoVars.count(D)) {
6177 D->setInvalidDecl();
6181 QualType Ty = VD->getType();
6182 if (Ty->isDependentType()) return;
6184 // Require a complete type.
6185 if (RequireCompleteType(VD->getLocation(),
6186 Context.getBaseElementType(Ty),
6187 diag::err_typecheck_decl_incomplete_type)) {
6188 VD->setInvalidDecl();
6192 // Require an abstract type.
6193 if (RequireNonAbstractType(VD->getLocation(), Ty,
6194 diag::err_abstract_type_in_decl,
6195 AbstractVariableType)) {
6196 VD->setInvalidDecl();
6200 // Don't bother complaining about constructors or destructors,
6204 void Sema::ActOnUninitializedDecl(Decl *RealDecl,
6205 bool TypeMayContainAuto) {
6206 // If there is no declaration, there was an error parsing it. Just ignore it.
6210 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
6211 QualType Type = Var->getType();
6213 // C++0x [dcl.spec.auto]p3
6214 if (TypeMayContainAuto && Type->getContainedAutoType()) {
6215 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
6216 << Var->getDeclName() << Type;
6217 Var->setInvalidDecl();
6221 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must
6222 // have an initializer.
6223 // C++0x [class.static.data]p3: A static data member can be declared with
6224 // the constexpr specifier; if so, its declaration shall specify
6225 // a brace-or-equal-initializer.
6227 // A static data member's definition may inherit an initializer from an
6228 // in-class declaration.
6229 if (Var->isConstexpr() && !Var->getAnyInitializer()) {
6230 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init)
6231 << Var->getDeclName();
6232 Var->setInvalidDecl();
6236 switch (Var->isThisDeclarationADefinition()) {
6237 case VarDecl::Definition:
6238 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
6241 // We have an out-of-line definition of a static data member
6242 // that has an in-class initializer, so we type-check this like
6247 case VarDecl::DeclarationOnly:
6248 // It's only a declaration.
6250 // Block scope. C99 6.7p7: If an identifier for an object is
6251 // declared with no linkage (C99 6.2.2p6), the type for the
6252 // object shall be complete.
6253 if (!Type->isDependentType() && Var->isLocalVarDecl() &&
6254 !Var->getLinkage() && !Var->isInvalidDecl() &&
6255 RequireCompleteType(Var->getLocation(), Type,
6256 diag::err_typecheck_decl_incomplete_type))
6257 Var->setInvalidDecl();
6259 // Make sure that the type is not abstract.
6260 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
6261 RequireNonAbstractType(Var->getLocation(), Type,
6262 diag::err_abstract_type_in_decl,
6263 AbstractVariableType))
6264 Var->setInvalidDecl();
6267 case VarDecl::TentativeDefinition:
6268 // File scope. C99 6.9.2p2: A declaration of an identifier for an
6269 // object that has file scope without an initializer, and without a
6270 // storage-class specifier or with the storage-class specifier "static",
6271 // constitutes a tentative definition. Note: A tentative definition with
6272 // external linkage is valid (C99 6.2.2p5).
6273 if (!Var->isInvalidDecl()) {
6274 if (const IncompleteArrayType *ArrayT
6275 = Context.getAsIncompleteArrayType(Type)) {
6276 if (RequireCompleteType(Var->getLocation(),
6277 ArrayT->getElementType(),
6278 diag::err_illegal_decl_array_incomplete_type))
6279 Var->setInvalidDecl();
6280 } else if (Var->getStorageClass() == SC_Static) {
6281 // C99 6.9.2p3: If the declaration of an identifier for an object is
6282 // a tentative definition and has internal linkage (C99 6.2.2p3), the
6283 // declared type shall not be an incomplete type.
6284 // NOTE: code such as the following
6286 // struct s { int a; };
6287 // is accepted by gcc. Hence here we issue a warning instead of
6288 // an error and we do not invalidate the static declaration.
6289 // NOTE: to avoid multiple warnings, only check the first declaration.
6290 if (Var->getPreviousDeclaration() == 0)
6291 RequireCompleteType(Var->getLocation(), Type,
6292 diag::ext_typecheck_decl_incomplete_type);
6296 // Record the tentative definition; we're done.
6297 if (!Var->isInvalidDecl())
6298 TentativeDefinitions.push_back(Var);
6302 // Provide a specific diagnostic for uninitialized variable
6303 // definitions with incomplete array type.
6304 if (Type->isIncompleteArrayType()) {
6305 Diag(Var->getLocation(),
6306 diag::err_typecheck_incomplete_array_needs_initializer);
6307 Var->setInvalidDecl();
6311 // Provide a specific diagnostic for uninitialized variable
6312 // definitions with reference type.
6313 if (Type->isReferenceType()) {
6314 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
6315 << Var->getDeclName()
6316 << SourceRange(Var->getLocation(), Var->getLocation());
6317 Var->setInvalidDecl();
6321 // Do not attempt to type-check the default initializer for a
6322 // variable with dependent type.
6323 if (Type->isDependentType())
6326 if (Var->isInvalidDecl())
6329 if (RequireCompleteType(Var->getLocation(),
6330 Context.getBaseElementType(Type),
6331 diag::err_typecheck_decl_incomplete_type)) {
6332 Var->setInvalidDecl();
6336 // The variable can not have an abstract class type.
6337 if (RequireNonAbstractType(Var->getLocation(), Type,
6338 diag::err_abstract_type_in_decl,
6339 AbstractVariableType)) {
6340 Var->setInvalidDecl();
6344 // Check for jumps past the implicit initializer. C++0x
6345 // clarifies that this applies to a "variable with automatic
6346 // storage duration", not a "local variable".
6347 // C++0x [stmt.dcl]p3
6348 // A program that jumps from a point where a variable with automatic
6349 // storage duration is not in scope to a point where it is in scope is
6350 // ill-formed unless the variable has scalar type, class type with a
6351 // trivial default constructor and a trivial destructor, a cv-qualified
6352 // version of one of these types, or an array of one of the preceding
6353 // types and is declared without an initializer.
6354 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) {
6355 if (const RecordType *Record
6356 = Context.getBaseElementType(Type)->getAs<RecordType>()) {
6357 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
6358 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) ||
6359 (getLangOptions().CPlusPlus0x &&
6360 (!CXXRecord->hasTrivialDefaultConstructor() ||
6361 !CXXRecord->hasTrivialDestructor())))
6362 getCurFunction()->setHasBranchProtectedScope();
6366 // C++03 [dcl.init]p9:
6367 // If no initializer is specified for an object, and the
6368 // object is of (possibly cv-qualified) non-POD class type (or
6369 // array thereof), the object shall be default-initialized; if
6370 // the object is of const-qualified type, the underlying class
6371 // type shall have a user-declared default
6372 // constructor. Otherwise, if no initializer is specified for
6373 // a non- static object, the object and its subobjects, if
6374 // any, have an indeterminate initial value); if the object
6375 // or any of its subobjects are of const-qualified type, the
6376 // program is ill-formed.
6377 // C++0x [dcl.init]p11:
6378 // If no initializer is specified for an object, the object is
6379 // default-initialized; [...].
6380 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
6381 InitializationKind Kind
6382 = InitializationKind::CreateDefault(Var->getLocation());
6384 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
6385 ExprResult Init = InitSeq.Perform(*this, Entity, Kind,
6386 MultiExprArg(*this, 0, 0));
6387 if (Init.isInvalid())
6388 Var->setInvalidDecl();
6389 else if (Init.get())
6390 Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
6392 CheckCompleteVariableDeclaration(Var);
6396 void Sema::ActOnCXXForRangeDecl(Decl *D) {
6397 VarDecl *VD = dyn_cast<VarDecl>(D);
6399 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
6400 D->setInvalidDecl();
6404 VD->setCXXForRangeDecl(true);
6406 // for-range-declaration cannot be given a storage class specifier.
6408 switch (VD->getStorageClassAsWritten()) {
6417 case SC_PrivateExtern:
6426 case SC_OpenCLWorkGroupLocal:
6427 llvm_unreachable("Unexpected storage class");
6429 if (VD->isConstexpr())
6432 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
6433 << VD->getDeclName() << Error;
6434 D->setInvalidDecl();
6438 void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
6439 if (var->isInvalidDecl()) return;
6441 // In ARC, don't allow jumps past the implicit initialization of a
6442 // local retaining variable.
6443 if (getLangOptions().ObjCAutoRefCount &&
6444 var->hasLocalStorage()) {
6445 switch (var->getType().getObjCLifetime()) {
6446 case Qualifiers::OCL_None:
6447 case Qualifiers::OCL_ExplicitNone:
6448 case Qualifiers::OCL_Autoreleasing:
6451 case Qualifiers::OCL_Weak:
6452 case Qualifiers::OCL_Strong:
6453 getCurFunction()->setHasBranchProtectedScope();
6458 // All the following checks are C++ only.
6459 if (!getLangOptions().CPlusPlus) return;
6461 QualType baseType = Context.getBaseElementType(var->getType());
6462 if (baseType->isDependentType()) return;
6464 // __block variables might require us to capture a copy-initializer.
6465 if (var->hasAttr<BlocksAttr>()) {
6466 // It's currently invalid to ever have a __block variable with an
6467 // array type; should we diagnose that here?
6469 // Regardless, we don't want to ignore array nesting when
6470 // constructing this copy.
6471 QualType type = var->getType();
6473 if (type->isStructureOrClassType()) {
6474 SourceLocation poi = var->getLocation();
6475 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi);
6477 PerformCopyInitialization(
6478 InitializedEntity::InitializeBlock(poi, type, false),
6479 poi, Owned(varRef));
6480 if (!result.isInvalid()) {
6481 result = MaybeCreateExprWithCleanups(result);
6482 Expr *init = result.takeAs<Expr>();
6483 Context.setBlockVarCopyInits(var, init);
6488 // Check for global constructors.
6489 if (!var->getDeclContext()->isDependentContext() &&
6490 var->hasGlobalStorage() &&
6491 !var->isStaticLocal() &&
6493 !var->getInit()->isConstantInitializer(Context,
6494 baseType->isReferenceType()))
6495 Diag(var->getLocation(), diag::warn_global_constructor)
6496 << var->getInit()->getSourceRange();
6498 // Require the destructor.
6499 if (const RecordType *recordType = baseType->getAs<RecordType>())
6500 FinalizeVarWithDestructor(var, recordType);
6503 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
6504 /// any semantic actions necessary after any initializer has been attached.
6506 Sema::FinalizeDeclaration(Decl *ThisDecl) {
6507 // Note that we are no longer parsing the initializer for this declaration.
6508 ParsingInitForAutoVars.erase(ThisDecl);
6511 Sema::DeclGroupPtrTy
6512 Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
6513 Decl **Group, unsigned NumDecls) {
6514 SmallVector<Decl*, 8> Decls;
6516 if (DS.isTypeSpecOwned())
6517 Decls.push_back(DS.getRepAsDecl());
6519 for (unsigned i = 0; i != NumDecls; ++i)
6520 if (Decl *D = Group[i])
6523 return BuildDeclaratorGroup(Decls.data(), Decls.size(),
6524 DS.getTypeSpecType() == DeclSpec::TST_auto);
6527 /// BuildDeclaratorGroup - convert a list of declarations into a declaration
6528 /// group, performing any necessary semantic checking.
6529 Sema::DeclGroupPtrTy
6530 Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls,
6531 bool TypeMayContainAuto) {
6532 // C++0x [dcl.spec.auto]p7:
6533 // If the type deduced for the template parameter U is not the same in each
6534 // deduction, the program is ill-formed.
6535 // FIXME: When initializer-list support is added, a distinction is needed
6536 // between the deduced type U and the deduced type which 'auto' stands for.
6537 // auto a = 0, b = { 1, 2, 3 };
6538 // is legal because the deduced type U is 'int' in both cases.
6539 if (TypeMayContainAuto && NumDecls > 1) {
6541 CanQualType DeducedCanon;
6542 VarDecl *DeducedDecl = 0;
6543 for (unsigned i = 0; i != NumDecls; ++i) {
6544 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
6545 AutoType *AT = D->getType()->getContainedAutoType();
6546 // Don't reissue diagnostics when instantiating a template.
6547 if (AT && D->isInvalidDecl())
6549 if (AT && AT->isDeduced()) {
6550 QualType U = AT->getDeducedType();
6551 CanQualType UCanon = Context.getCanonicalType(U);
6552 if (Deduced.isNull()) {
6554 DeducedCanon = UCanon;
6556 } else if (DeducedCanon != UCanon) {
6557 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
6558 diag::err_auto_different_deductions)
6559 << Deduced << DeducedDecl->getDeclName()
6560 << U << D->getDeclName()
6561 << DeducedDecl->getInit()->getSourceRange()
6562 << D->getInit()->getSourceRange();
6563 D->setInvalidDecl();
6571 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls));
6575 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
6576 /// to introduce parameters into function prototype scope.
6577 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
6578 const DeclSpec &DS = D.getDeclSpec();
6580 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
6581 VarDecl::StorageClass StorageClass = SC_None;
6582 VarDecl::StorageClass StorageClassAsWritten = SC_None;
6583 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
6584 StorageClass = SC_Register;
6585 StorageClassAsWritten = SC_Register;
6586 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
6587 Diag(DS.getStorageClassSpecLoc(),
6588 diag::err_invalid_storage_class_in_func_decl);
6589 D.getMutableDeclSpec().ClearStorageClassSpecs();
6592 if (D.getDeclSpec().isThreadSpecified())
6593 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
6594 if (D.getDeclSpec().isConstexprSpecified())
6595 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
6598 DiagnoseFunctionSpecifiers(D);
6600 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6601 QualType parmDeclType = TInfo->getType();
6603 if (getLangOptions().CPlusPlus) {
6604 // Check that there are no default arguments inside the type of this
6606 CheckExtraCXXDefaultArguments(D);
6608 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
6609 if (D.getCXXScopeSpec().isSet()) {
6610 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
6611 << D.getCXXScopeSpec().getRange();
6612 D.getCXXScopeSpec().clear();
6616 // Ensure we have a valid name
6617 IdentifierInfo *II = 0;
6619 II = D.getIdentifier();
6621 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
6622 << GetNameForDeclarator(D).getName().getAsString();
6623 D.setInvalidType(true);
6627 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
6629 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
6632 if (R.isSingleResult()) {
6633 NamedDecl *PrevDecl = R.getFoundDecl();
6634 if (PrevDecl->isTemplateParameter()) {
6635 // Maybe we will complain about the shadowed template parameter.
6636 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
6637 // Just pretend that we didn't see the previous declaration.
6639 } else if (S->isDeclScope(PrevDecl)) {
6640 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
6641 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6643 // Recover by removing the name
6645 D.SetIdentifier(0, D.getIdentifierLoc());
6646 D.setInvalidType(true);
6651 // Temporarily put parameter variables in the translation unit, not
6652 // the enclosing context. This prevents them from accidentally
6653 // looking like class members in C++.
6654 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
6655 D.getSourceRange().getBegin(),
6656 D.getIdentifierLoc(), II,
6657 parmDeclType, TInfo,
6658 StorageClass, StorageClassAsWritten);
6660 if (D.isInvalidType())
6661 New->setInvalidDecl();
6663 assert(S->isFunctionPrototypeScope());
6664 assert(S->getFunctionPrototypeDepth() >= 1);
6665 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
6666 S->getNextFunctionPrototypeIndex());
6668 // Add the parameter declaration into this scope.
6671 IdResolver.AddDecl(New);
6673 ProcessDeclAttributes(S, New, D);
6675 if (D.getDeclSpec().isModulePrivateSpecified())
6676 Diag(New->getLocation(), diag::err_module_private_local)
6677 << 1 << New->getDeclName()
6678 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
6679 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
6681 if (New->hasAttr<BlocksAttr>()) {
6682 Diag(New->getLocation(), diag::err_block_on_nonlocal);
6687 /// \brief Synthesizes a variable for a parameter arising from a
6689 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
6692 /* FIXME: setting StartLoc == Loc.
6693 Would it be worth to modify callers so as to provide proper source
6694 location for the unnamed parameters, embedding the parameter's type? */
6695 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0,
6696 T, Context.getTrivialTypeSourceInfo(T, Loc),
6697 SC_None, SC_None, 0);
6698 Param->setImplicit();
6702 void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
6703 ParmVarDecl * const *ParamEnd) {
6704 // Don't diagnose unused-parameter errors in template instantiations; we
6705 // will already have done so in the template itself.
6706 if (!ActiveTemplateInstantiations.empty())
6709 for (; Param != ParamEnd; ++Param) {
6710 if (!(*Param)->isUsed() && (*Param)->getDeclName() &&
6711 !(*Param)->hasAttr<UnusedAttr>()) {
6712 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
6713 << (*Param)->getDeclName();
6718 void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param,
6719 ParmVarDecl * const *ParamEnd,
6722 if (LangOpts.NumLargeByValueCopy == 0) // No check.
6725 // Warn if the return value is pass-by-value and larger than the specified
6727 if (ReturnTy.isPODType(Context)) {
6728 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
6729 if (Size > LangOpts.NumLargeByValueCopy)
6730 Diag(D->getLocation(), diag::warn_return_value_size)
6731 << D->getDeclName() << Size;
6734 // Warn if any parameter is pass-by-value and larger than the specified
6736 for (; Param != ParamEnd; ++Param) {
6737 QualType T = (*Param)->getType();
6738 if (!T.isPODType(Context))
6740 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
6741 if (Size > LangOpts.NumLargeByValueCopy)
6742 Diag((*Param)->getLocation(), diag::warn_parameter_size)
6743 << (*Param)->getDeclName() << Size;
6747 ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
6748 SourceLocation NameLoc, IdentifierInfo *Name,
6749 QualType T, TypeSourceInfo *TSInfo,
6750 VarDecl::StorageClass StorageClass,
6751 VarDecl::StorageClass StorageClassAsWritten) {
6752 // In ARC, infer a lifetime qualifier for appropriate parameter types.
6753 if (getLangOptions().ObjCAutoRefCount &&
6754 T.getObjCLifetime() == Qualifiers::OCL_None &&
6755 T->isObjCLifetimeType()) {
6757 Qualifiers::ObjCLifetime lifetime;
6759 // Special cases for arrays:
6760 // - if it's const, use __unsafe_unretained
6761 // - otherwise, it's an error
6762 if (T->isArrayType()) {
6763 if (!T.isConstQualified()) {
6764 DelayedDiagnostics.add(
6765 sema::DelayedDiagnostic::makeForbiddenType(
6766 NameLoc, diag::err_arc_array_param_no_ownership, T, false));
6768 lifetime = Qualifiers::OCL_ExplicitNone;
6770 lifetime = T->getObjCARCImplicitLifetime();
6772 T = Context.getLifetimeQualifiedType(T, lifetime);
6775 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
6776 Context.getAdjustedParameterType(T),
6778 StorageClass, StorageClassAsWritten,
6781 // Parameters can not be abstract class types.
6782 // For record types, this is done by the AbstractClassUsageDiagnoser once
6783 // the class has been completely parsed.
6784 if (!CurContext->isRecord() &&
6785 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
6787 New->setInvalidDecl();
6789 // Parameter declarators cannot be interface types. All ObjC objects are
6790 // passed by reference.
6791 if (T->isObjCObjectType()) {
6793 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
6794 << FixItHint::CreateInsertion(NameLoc, "*");
6795 T = Context.getObjCObjectPointerType(T);
6799 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
6800 // duration shall not be qualified by an address-space qualifier."
6801 // Since all parameters have automatic store duration, they can not have
6802 // an address space.
6803 if (T.getAddressSpace() != 0) {
6804 Diag(NameLoc, diag::err_arg_with_address_space);
6805 New->setInvalidDecl();
6811 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
6812 SourceLocation LocAfterDecls) {
6813 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
6815 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
6816 // for a K&R function.
6817 if (!FTI.hasPrototype) {
6818 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
6820 if (FTI.ArgInfo[i].Param == 0) {
6821 llvm::SmallString<256> Code;
6822 llvm::raw_svector_ostream(Code) << " int "
6823 << FTI.ArgInfo[i].Ident->getName()
6825 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
6826 << FTI.ArgInfo[i].Ident
6827 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
6829 // Implicitly declare the argument as type 'int' for lack of a better
6831 AttributeFactory attrs;
6833 const char* PrevSpec; // unused
6834 unsigned DiagID; // unused
6835 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
6837 Declarator ParamD(DS, Declarator::KNRTypeListContext);
6838 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
6839 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
6845 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
6847 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
6848 assert(D.isFunctionDeclarator() && "Not a function declarator!");
6849 Scope *ParentScope = FnBodyScope->getParent();
6851 D.setFunctionDefinition(true);
6852 Decl *DP = HandleDeclarator(ParentScope, D,
6853 MultiTemplateParamsArg(*this));
6854 return ActOnStartOfFunctionDef(FnBodyScope, DP);
6857 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
6858 // Don't warn about invalid declarations.
6859 if (FD->isInvalidDecl())
6862 // Or declarations that aren't global.
6863 if (!FD->isGlobal())
6866 // Don't warn about C++ member functions.
6867 if (isa<CXXMethodDecl>(FD))
6870 // Don't warn about 'main'.
6874 // Don't warn about inline functions.
6875 if (FD->isInlined())
6878 // Don't warn about function templates.
6879 if (FD->getDescribedFunctionTemplate())
6882 // Don't warn about function template specializations.
6883 if (FD->isFunctionTemplateSpecialization())
6886 bool MissingPrototype = true;
6887 for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
6888 Prev; Prev = Prev->getPreviousDeclaration()) {
6889 // Ignore any declarations that occur in function or method
6890 // scope, because they aren't visible from the header.
6891 if (Prev->getDeclContext()->isFunctionOrMethod())
6894 MissingPrototype = !Prev->getType()->isFunctionProtoType();
6898 return MissingPrototype;
6901 void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) {
6902 // Don't complain if we're in GNU89 mode and the previous definition
6903 // was an extern inline function.
6904 const FunctionDecl *Definition;
6905 if (FD->isDefined(Definition) &&
6906 !canRedefineFunction(Definition, getLangOptions())) {
6907 if (getLangOptions().GNUMode && Definition->isInlineSpecified() &&
6908 Definition->getStorageClass() == SC_Extern)
6909 Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
6910 << FD->getDeclName() << getLangOptions().CPlusPlus;
6912 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
6913 Diag(Definition->getLocation(), diag::note_previous_definition);
6917 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
6918 // Clear the last template instantiation error context.
6919 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
6923 FunctionDecl *FD = 0;
6925 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
6926 FD = FunTmpl->getTemplatedDecl();
6928 FD = cast<FunctionDecl>(D);
6930 // Enter a new function scope
6931 PushFunctionScope();
6933 // See if this is a redefinition.
6934 if (!FD->isLateTemplateParsed())
6935 CheckForFunctionRedefinition(FD);
6937 // Builtin functions cannot be defined.
6938 if (unsigned BuiltinID = FD->getBuiltinID()) {
6939 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
6940 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
6941 FD->setInvalidDecl();
6945 // The return type of a function definition must be complete
6946 // (C99 6.9.1p3, C++ [dcl.fct]p6).
6947 QualType ResultType = FD->getResultType();
6948 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
6949 !FD->isInvalidDecl() &&
6950 RequireCompleteType(FD->getLocation(), ResultType,
6951 diag::err_func_def_incomplete_result))
6952 FD->setInvalidDecl();
6954 // GNU warning -Wmissing-prototypes:
6955 // Warn if a global function is defined without a previous
6956 // prototype declaration. This warning is issued even if the
6957 // definition itself provides a prototype. The aim is to detect
6958 // global functions that fail to be declared in header files.
6959 if (ShouldWarnAboutMissingPrototype(FD))
6960 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
6963 PushDeclContext(FnBodyScope, FD);
6965 // Check the validity of our function parameters
6966 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(),
6967 /*CheckParameterNames=*/true);
6969 // Introduce our parameters into the function scope
6970 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
6971 ParmVarDecl *Param = FD->getParamDecl(p);
6972 Param->setOwningFunction(FD);
6974 // If this has an identifier, add it to the scope stack.
6975 if (Param->getIdentifier() && FnBodyScope) {
6976 CheckShadow(FnBodyScope, Param);
6978 PushOnScopeChains(Param, FnBodyScope);
6982 // Checking attributes of current function definition
6983 // dllimport attribute.
6984 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
6985 if (DA && (!FD->getAttr<DLLExportAttr>())) {
6986 // dllimport attribute cannot be directly applied to definition.
6987 // Microsoft accepts dllimport for functions defined within class scope.
6988 if (!DA->isInherited() &&
6989 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) {
6990 Diag(FD->getLocation(),
6991 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
6993 FD->setInvalidDecl();
6997 // Visual C++ appears to not think this is an issue, so only issue
6998 // a warning when Microsoft extensions are disabled.
6999 if (!LangOpts.MicrosoftExt) {
7000 // If a symbol previously declared dllimport is later defined, the
7001 // attribute is ignored in subsequent references, and a warning is
7003 Diag(FD->getLocation(),
7004 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
7005 << FD->getName() << "dllimport";
7011 /// \brief Given the set of return statements within a function body,
7012 /// compute the variables that are subject to the named return value
7015 /// Each of the variables that is subject to the named return value
7016 /// optimization will be marked as NRVO variables in the AST, and any
7017 /// return statement that has a marked NRVO variable as its NRVO candidate can
7018 /// use the named return value optimization.
7020 /// This function applies a very simplistic algorithm for NRVO: if every return
7021 /// statement in the function has the same NRVO candidate, that candidate is
7022 /// the NRVO variable.
7024 /// FIXME: Employ a smarter algorithm that accounts for multiple return
7025 /// statements and the lifetimes of the NRVO candidates. We should be able to
7026 /// find a maximal set of NRVO variables.
7027 void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
7028 ReturnStmt **Returns = Scope->Returns.data();
7030 const VarDecl *NRVOCandidate = 0;
7031 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
7032 if (!Returns[I]->getNRVOCandidate())
7036 NRVOCandidate = Returns[I]->getNRVOCandidate();
7037 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
7042 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
7045 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
7046 return ActOnFinishFunctionBody(D, move(BodyArg), false);
7049 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
7050 bool IsInstantiation) {
7051 FunctionDecl *FD = 0;
7052 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
7054 FD = FunTmpl->getTemplatedDecl();
7056 FD = dyn_cast_or_null<FunctionDecl>(dcl);
7058 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
7059 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0;
7064 // C and C++ allow for main to automagically return 0.
7065 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
7066 FD->setHasImplicitReturnZero(true);
7067 WP.disableCheckFallThrough();
7068 } else if (FD->hasAttr<NakedAttr>()) {
7069 // If the function is marked 'naked', don't complain about missing return
7071 WP.disableCheckFallThrough();
7074 // MSVC permits the use of pure specifier (=0) on function definition,
7075 // defined at class scope, warn about this non standard construct.
7076 if (getLangOptions().MicrosoftExt && FD->isPure())
7077 Diag(FD->getLocation(), diag::warn_pure_function_definition);
7079 if (!FD->isInvalidDecl()) {
7080 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
7081 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(),
7082 FD->getResultType(), FD);
7084 // If this is a constructor, we need a vtable.
7085 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
7086 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
7088 computeNRVO(Body, getCurFunction());
7091 assert(FD == getCurFunctionDecl() && "Function parsing confused");
7092 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
7093 assert(MD == getCurMethodDecl() && "Method parsing confused");
7096 MD->setEndLoc(Body->getLocEnd());
7097 if (!MD->isInvalidDecl()) {
7098 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
7099 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(),
7100 MD->getResultType(), MD);
7103 computeNRVO(Body, getCurFunction());
7105 if (ObjCShouldCallSuperDealloc) {
7106 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc);
7107 ObjCShouldCallSuperDealloc = false;
7109 if (ObjCShouldCallSuperFinalize) {
7110 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize);
7111 ObjCShouldCallSuperFinalize = false;
7117 assert(!ObjCShouldCallSuperDealloc && "This should only be set for "
7118 "ObjC methods, which should have been handled in the block above.");
7119 assert(!ObjCShouldCallSuperFinalize && "This should only be set for "
7120 "ObjC methods, which should have been handled in the block above.");
7122 // Verify and clean out per-function state.
7124 // C++ constructors that have function-try-blocks can't have return
7125 // statements in the handlers of that block. (C++ [except.handle]p14)
7127 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
7128 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
7130 // Verify that gotos and switch cases don't jump into scopes illegally.
7131 if (getCurFunction()->NeedsScopeChecking() &&
7132 !dcl->isInvalidDecl() &&
7133 !hasAnyUnrecoverableErrorsInThisFunction())
7134 DiagnoseInvalidJumps(Body);
7136 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
7137 if (!Destructor->getParent()->isDependentType())
7138 CheckDestructor(Destructor);
7140 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
7141 Destructor->getParent());
7144 // If any errors have occurred, clear out any temporaries that may have
7145 // been leftover. This ensures that these temporaries won't be picked up for
7146 // deletion in some later function.
7147 if (PP.getDiagnostics().hasErrorOccurred() ||
7148 PP.getDiagnostics().getSuppressAllDiagnostics()) {
7149 ExprTemporaries.clear();
7150 ExprNeedsCleanups = false;
7151 } else if (!isa<FunctionTemplateDecl>(dcl)) {
7152 // Since the body is valid, issue any analysis-based warnings that are
7157 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
7158 !CheckConstexprFunctionBody(FD, Body))
7159 FD->setInvalidDecl();
7161 assert(ExprTemporaries.empty() && "Leftover temporaries in function");
7162 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
7165 if (!IsInstantiation)
7168 PopFunctionOrBlockScope(ActivePolicy, dcl);
7170 // If any errors have occurred, clear out any temporaries that may have
7171 // been leftover. This ensures that these temporaries won't be picked up for
7172 // deletion in some later function.
7173 if (getDiagnostics().hasErrorOccurred()) {
7174 ExprTemporaries.clear();
7175 ExprNeedsCleanups = false;
7182 /// When we finish delayed parsing of an attribute, we must attach it to the
7184 void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
7185 ParsedAttributes &Attrs) {
7186 ProcessDeclAttributeList(S, D, Attrs.getList());
7190 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function
7191 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
7192 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
7193 IdentifierInfo &II, Scope *S) {
7194 // Before we produce a declaration for an implicitly defined
7195 // function, see whether there was a locally-scoped declaration of
7196 // this name as a function or variable. If so, use that
7197 // (non-visible) declaration, and complain about it.
7198 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
7199 = findLocallyScopedExternalDecl(&II);
7200 if (Pos != LocallyScopedExternalDecls.end()) {
7201 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
7202 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
7206 // Extension in C99. Legal in C90, but warn about it.
7207 if (II.getName().startswith("__builtin_"))
7208 Diag(Loc, diag::warn_builtin_unknown) << &II;
7209 else if (getLangOptions().C99)
7210 Diag(Loc, diag::ext_implicit_function_decl) << &II;
7212 Diag(Loc, diag::warn_implicit_function_decl) << &II;
7214 // Set a Declarator for the implicit definition: int foo();
7216 AttributeFactory attrFactory;
7217 DeclSpec DS(attrFactory);
7219 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
7220 (void)Error; // Silence warning.
7221 assert(!Error && "Error setting up implicit decl!");
7222 Declarator D(DS, Declarator::BlockContext);
7223 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0,
7224 0, 0, true, SourceLocation(),
7226 EST_None, SourceLocation(),
7227 0, 0, 0, 0, Loc, Loc, D),
7230 D.SetIdentifier(&II, Loc);
7232 // Insert this function into translation-unit scope.
7234 DeclContext *PrevDC = CurContext;
7235 CurContext = Context.getTranslationUnitDecl();
7237 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
7240 CurContext = PrevDC;
7242 AddKnownFunctionAttributes(FD);
7247 /// \brief Adds any function attributes that we know a priori based on
7248 /// the declaration of this function.
7250 /// These attributes can apply both to implicitly-declared builtins
7251 /// (like __builtin___printf_chk) or to library-declared functions
7252 /// like NSLog or printf.
7254 /// We need to check for duplicate attributes both here and where user-written
7255 /// attributes are applied to declarations.
7256 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
7257 if (FD->isInvalidDecl())
7260 // If this is a built-in function, map its builtin attributes to
7261 // actual attributes.
7262 if (unsigned BuiltinID = FD->getBuiltinID()) {
7263 // Handle printf-formatting attributes.
7266 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
7267 if (!FD->getAttr<FormatAttr>())
7268 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7269 "printf", FormatIdx+1,
7270 HasVAListArg ? 0 : FormatIdx+2));
7272 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
7274 if (!FD->getAttr<FormatAttr>())
7275 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7276 "scanf", FormatIdx+1,
7277 HasVAListArg ? 0 : FormatIdx+2));
7280 // Mark const if we don't care about errno and that is the only
7281 // thing preventing the function from being const. This allows
7282 // IRgen to use LLVM intrinsics for such functions.
7283 if (!getLangOptions().MathErrno &&
7284 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
7285 if (!FD->getAttr<ConstAttr>())
7286 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
7289 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
7290 !FD->getAttr<ReturnsTwiceAttr>())
7291 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context));
7292 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>())
7293 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
7294 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>())
7295 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
7298 IdentifierInfo *Name = FD->getIdentifier();
7301 if ((!getLangOptions().CPlusPlus &&
7302 FD->getDeclContext()->isTranslationUnit()) ||
7303 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
7304 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
7305 LinkageSpecDecl::lang_c)) {
7306 // Okay: this could be a libc/libm/Objective-C function we know
7311 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) {
7312 // FIXME: NSLog and NSLogv should be target specific
7313 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) {
7314 // FIXME: We known better than our headers.
7315 const_cast<FormatAttr *>(Format)->setType(Context, "printf");
7317 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7319 Name->isStr("NSLogv") ? 0 : 2));
7320 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
7321 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
7322 // target-specific builtins, perhaps?
7323 if (!FD->getAttr<FormatAttr>())
7324 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7326 Name->isStr("vasprintf") ? 0 : 3));
7330 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
7331 TypeSourceInfo *TInfo) {
7332 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
7333 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
7336 assert(D.isInvalidType() && "no declarator info for valid type");
7337 TInfo = Context.getTrivialTypeSourceInfo(T);
7340 // Scope manipulation handled by caller.
7341 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
7342 D.getSourceRange().getBegin(),
7343 D.getIdentifierLoc(),
7347 // Bail out immediately if we have an invalid declaration.
7348 if (D.isInvalidType()) {
7349 NewTD->setInvalidDecl();
7353 if (D.getDeclSpec().isModulePrivateSpecified()) {
7354 if (CurContext->isFunctionOrMethod())
7355 Diag(NewTD->getLocation(), diag::err_module_private_local)
7356 << 2 << NewTD->getDeclName()
7357 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
7358 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
7360 NewTD->setModulePrivate();
7363 // C++ [dcl.typedef]p8:
7364 // If the typedef declaration defines an unnamed class (or
7365 // enum), the first typedef-name declared by the declaration
7366 // to be that class type (or enum type) is used to denote the
7367 // class type (or enum type) for linkage purposes only.
7368 // We need to check whether the type was declared in the declaration.
7369 switch (D.getDeclSpec().getTypeSpecType()) {
7374 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
7376 // Do nothing if the tag is not anonymous or already has an
7377 // associated typedef (from an earlier typedef in this decl group).
7378 if (tagFromDeclSpec->getIdentifier()) break;
7379 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break;
7381 // A well-formed anonymous tag must always be a TUK_Definition.
7382 assert(tagFromDeclSpec->isThisDeclarationADefinition());
7384 // The type must match the tag exactly; no qualifiers allowed.
7385 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec)))
7388 // Otherwise, set this is the anon-decl typedef for the tag.
7389 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
7401 /// \brief Determine whether a tag with a given kind is acceptable
7402 /// as a redeclaration of the given tag declaration.
7404 /// \returns true if the new tag kind is acceptable, false otherwise.
7405 bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
7406 TagTypeKind NewTag, bool isDefinition,
7407 SourceLocation NewTagLoc,
7408 const IdentifierInfo &Name) {
7409 // C++ [dcl.type.elab]p3:
7410 // The class-key or enum keyword present in the
7411 // elaborated-type-specifier shall agree in kind with the
7412 // declaration to which the name in the elaborated-type-specifier
7413 // refers. This rule also applies to the form of
7414 // elaborated-type-specifier that declares a class-name or
7415 // friend class since it can be construed as referring to the
7416 // definition of the class. Thus, in any
7417 // elaborated-type-specifier, the enum keyword shall be used to
7418 // refer to an enumeration (7.2), the union class-key shall be
7419 // used to refer to a union (clause 9), and either the class or
7420 // struct class-key shall be used to refer to a class (clause 9)
7421 // declared using the class or struct class-key.
7422 TagTypeKind OldTag = Previous->getTagKind();
7423 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct))
7424 if (OldTag == NewTag)
7427 if ((OldTag == TTK_Struct || OldTag == TTK_Class) &&
7428 (NewTag == TTK_Struct || NewTag == TTK_Class)) {
7429 // Warn about the struct/class tag mismatch.
7430 bool isTemplate = false;
7431 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
7432 isTemplate = Record->getDescribedClassTemplate();
7434 if (!ActiveTemplateInstantiations.empty()) {
7435 // In a template instantiation, do not offer fix-its for tag mismatches
7436 // since they usually mess up the template instead of fixing the problem.
7437 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
7438 << (NewTag == TTK_Class) << isTemplate << &Name;
7443 // On definitions, check previous tags and issue a fix-it for each
7444 // one that doesn't match the current tag.
7445 if (Previous->getDefinition()) {
7446 // Don't suggest fix-its for redefinitions.
7450 bool previousMismatch = false;
7451 for (TagDecl::redecl_iterator I(Previous->redecls_begin()),
7452 E(Previous->redecls_end()); I != E; ++I) {
7453 if (I->getTagKind() != NewTag) {
7454 if (!previousMismatch) {
7455 previousMismatch = true;
7456 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
7457 << (NewTag == TTK_Class) << isTemplate << &Name;
7459 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
7460 << (NewTag == TTK_Class)
7461 << FixItHint::CreateReplacement(I->getInnerLocStart(),
7462 NewTag == TTK_Class?
7463 "class" : "struct");
7469 // Check for a previous definition. If current tag and definition
7470 // are same type, do nothing. If no definition, but disagree with
7471 // with previous tag type, give a warning, but no fix-it.
7472 const TagDecl *Redecl = Previous->getDefinition() ?
7473 Previous->getDefinition() : Previous;
7474 if (Redecl->getTagKind() == NewTag) {
7478 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
7479 << (NewTag == TTK_Class)
7480 << isTemplate << &Name;
7481 Diag(Redecl->getLocation(), diag::note_previous_use);
7483 // If there is a previous defintion, suggest a fix-it.
7484 if (Previous->getDefinition()) {
7485 Diag(NewTagLoc, diag::note_struct_class_suggestion)
7486 << (Redecl->getTagKind() == TTK_Class)
7487 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
7488 Redecl->getTagKind() == TTK_Class? "class" : "struct");
7496 /// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
7497 /// former case, Name will be non-null. In the later case, Name will be null.
7498 /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
7499 /// reference/declaration/definition of a tag.
7500 Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
7501 SourceLocation KWLoc, CXXScopeSpec &SS,
7502 IdentifierInfo *Name, SourceLocation NameLoc,
7503 AttributeList *Attr, AccessSpecifier AS,
7504 SourceLocation ModulePrivateLoc,
7505 MultiTemplateParamsArg TemplateParameterLists,
7506 bool &OwnedDecl, bool &IsDependent,
7507 bool ScopedEnum, bool ScopedEnumUsesClassTag,
7508 TypeResult UnderlyingType) {
7509 // If this is not a definition, it must have a name.
7510 assert((Name != 0 || TUK == TUK_Definition) &&
7511 "Nameless record must be a definition!");
7512 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
7515 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
7517 // FIXME: Check explicit specializations more carefully.
7518 bool isExplicitSpecialization = false;
7519 bool Invalid = false;
7521 // We only need to do this matching if we have template parameters
7522 // or a scope specifier, which also conveniently avoids this work
7523 // for non-C++ cases.
7524 if (TemplateParameterLists.size() > 0 ||
7525 (SS.isNotEmpty() && TUK != TUK_Reference)) {
7526 if (TemplateParameterList *TemplateParams
7527 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS,
7528 TemplateParameterLists.get(),
7529 TemplateParameterLists.size(),
7531 isExplicitSpecialization,
7533 if (TemplateParams->size() > 0) {
7534 // This is a declaration or definition of a class template (which may
7535 // be a member of another template).
7541 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
7542 SS, Name, NameLoc, Attr,
7545 TemplateParameterLists.size() - 1,
7546 (TemplateParameterList**) TemplateParameterLists.release());
7547 return Result.get();
7549 // The "template<>" header is extraneous.
7550 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
7551 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
7552 isExplicitSpecialization = true;
7557 // Figure out the underlying type if this a enum declaration. We need to do
7558 // this early, because it's needed to detect if this is an incompatible
7560 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
7562 if (Kind == TTK_Enum) {
7563 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
7564 // No underlying type explicitly specified, or we failed to parse the
7565 // type, default to int.
7566 EnumUnderlying = Context.IntTy.getTypePtr();
7567 else if (UnderlyingType.get()) {
7568 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
7569 // integral type; any cv-qualification is ignored.
7570 TypeSourceInfo *TI = 0;
7571 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI);
7572 EnumUnderlying = TI;
7574 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
7576 if (!T->isDependentType() && !T->isIntegralType(Context)) {
7577 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying)
7579 // Recover by falling back to int.
7580 EnumUnderlying = Context.IntTy.getTypePtr();
7583 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI,
7584 UPPC_FixedUnderlyingType))
7585 EnumUnderlying = Context.IntTy.getTypePtr();
7587 } else if (getLangOptions().MicrosoftExt)
7588 // Microsoft enums are always of int type.
7589 EnumUnderlying = Context.IntTy.getTypePtr();
7592 DeclContext *SearchDC = CurContext;
7593 DeclContext *DC = CurContext;
7594 bool isStdBadAlloc = false;
7596 RedeclarationKind Redecl = ForRedeclaration;
7597 if (TUK == TUK_Friend || TUK == TUK_Reference)
7598 Redecl = NotForRedeclaration;
7600 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
7602 if (Name && SS.isNotEmpty()) {
7603 // We have a nested-name tag ('struct foo::bar').
7605 // Check for invalid 'foo::'.
7606 if (SS.isInvalid()) {
7611 // If this is a friend or a reference to a class in a dependent
7612 // context, don't try to make a decl for it.
7613 if (TUK == TUK_Friend || TUK == TUK_Reference) {
7614 DC = computeDeclContext(SS, false);
7620 DC = computeDeclContext(SS, true);
7622 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
7628 if (RequireCompleteDeclContext(SS, DC))
7632 // Look-up name inside 'foo::'.
7633 LookupQualifiedName(Previous, DC);
7635 if (Previous.isAmbiguous())
7638 if (Previous.empty()) {
7639 // Name lookup did not find anything. However, if the
7640 // nested-name-specifier refers to the current instantiation,
7641 // and that current instantiation has any dependent base
7642 // classes, we might find something at instantiation time: treat
7643 // this as a dependent elaborated-type-specifier.
7644 // But this only makes any sense for reference-like lookups.
7645 if (Previous.wasNotFoundInCurrentInstantiation() &&
7646 (TUK == TUK_Reference || TUK == TUK_Friend)) {
7651 // A tag 'foo::bar' must already exist.
7652 Diag(NameLoc, diag::err_not_tag_in_scope)
7653 << Kind << Name << DC << SS.getRange();
7659 // If this is a named struct, check to see if there was a previous forward
7660 // declaration or definition.
7661 // FIXME: We're looking into outer scopes here, even when we
7662 // shouldn't be. Doing so can result in ambiguities that we
7663 // shouldn't be diagnosing.
7664 LookupName(Previous, S);
7666 if (Previous.isAmbiguous() &&
7667 (TUK == TUK_Definition || TUK == TUK_Declaration)) {
7668 LookupResult::Filter F = Previous.makeFilter();
7669 while (F.hasNext()) {
7670 NamedDecl *ND = F.next();
7671 if (ND->getDeclContext()->getRedeclContext() != SearchDC)
7677 // Note: there used to be some attempt at recovery here.
7678 if (Previous.isAmbiguous())
7681 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) {
7682 // FIXME: This makes sure that we ignore the contexts associated
7683 // with C structs, unions, and enums when looking for a matching
7684 // tag declaration or definition. See the similar lookup tweak
7685 // in Sema::LookupName; is there a better way to deal with this?
7686 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
7687 SearchDC = SearchDC->getParent();
7689 } else if (S->isFunctionPrototypeScope()) {
7690 // If this is an enum declaration in function prototype scope, set its
7691 // initial context to the translation unit.
7692 SearchDC = Context.getTranslationUnitDecl();
7695 if (Previous.isSingleResult() &&
7696 Previous.getFoundDecl()->isTemplateParameter()) {
7697 // Maybe we will complain about the shadowed template parameter.
7698 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
7699 // Just pretend that we didn't see the previous declaration.
7703 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace &&
7704 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
7705 // This is a declaration of or a reference to "std::bad_alloc".
7706 isStdBadAlloc = true;
7708 if (Previous.empty() && StdBadAlloc) {
7709 // std::bad_alloc has been implicitly declared (but made invisible to
7710 // name lookup). Fill in this implicit declaration as the previous
7711 // declaration, so that the declarations get chained appropriately.
7712 Previous.addDecl(getStdBadAlloc());
7716 // If we didn't find a previous declaration, and this is a reference
7717 // (or friend reference), move to the correct scope. In C++, we
7718 // also need to do a redeclaration lookup there, just in case
7719 // there's a shadow friend decl.
7720 if (Name && Previous.empty() &&
7721 (TUK == TUK_Reference || TUK == TUK_Friend)) {
7722 if (Invalid) goto CreateNewDecl;
7723 assert(SS.isEmpty());
7725 if (TUK == TUK_Reference) {
7726 // C++ [basic.scope.pdecl]p5:
7727 // -- for an elaborated-type-specifier of the form
7729 // class-key identifier
7731 // if the elaborated-type-specifier is used in the
7732 // decl-specifier-seq or parameter-declaration-clause of a
7733 // function defined in namespace scope, the identifier is
7734 // declared as a class-name in the namespace that contains
7735 // the declaration; otherwise, except as a friend
7736 // declaration, the identifier is declared in the smallest
7737 // non-class, non-function-prototype scope that contains the
7740 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
7741 // C structs and unions.
7743 // It is an error in C++ to declare (rather than define) an enum
7744 // type, including via an elaborated type specifier. We'll
7745 // diagnose that later; for now, declare the enum in the same
7746 // scope as we would have picked for any other tag type.
7748 // GNU C also supports this behavior as part of its incomplete
7749 // enum types extension, while GNU C++ does not.
7751 // Find the context where we'll be declaring the tag.
7752 // FIXME: We would like to maintain the current DeclContext as the
7754 while (SearchDC->isRecord() || SearchDC->isTransparentContext())
7755 SearchDC = SearchDC->getParent();
7757 // Find the scope where we'll be declaring the tag.
7758 while (S->isClassScope() ||
7759 (getLangOptions().CPlusPlus &&
7760 S->isFunctionPrototypeScope()) ||
7761 ((S->getFlags() & Scope::DeclScope) == 0) ||
7763 ((DeclContext *)S->getEntity())->isTransparentContext()))
7766 assert(TUK == TUK_Friend);
7767 // C++ [namespace.memdef]p3:
7768 // If a friend declaration in a non-local class first declares a
7769 // class or function, the friend class or function is a member of
7770 // the innermost enclosing namespace.
7771 SearchDC = SearchDC->getEnclosingNamespaceContext();
7774 // In C++, we need to do a redeclaration lookup to properly
7775 // diagnose some problems.
7776 if (getLangOptions().CPlusPlus) {
7777 Previous.setRedeclarationKind(ForRedeclaration);
7778 LookupQualifiedName(Previous, SearchDC);
7782 if (!Previous.empty()) {
7783 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
7785 // It's okay to have a tag decl in the same scope as a typedef
7786 // which hides a tag decl in the same scope. Finding this
7787 // insanity with a redeclaration lookup can only actually happen
7790 // This is also okay for elaborated-type-specifiers, which is
7791 // technically forbidden by the current standard but which is
7792 // okay according to the likely resolution of an open issue;
7793 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
7794 if (getLangOptions().CPlusPlus) {
7795 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
7796 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
7797 TagDecl *Tag = TT->getDecl();
7798 if (Tag->getDeclName() == Name &&
7799 Tag->getDeclContext()->getRedeclContext()
7800 ->Equals(TD->getDeclContext()->getRedeclContext())) {
7803 Previous.addDecl(Tag);
7804 Previous.resolveKind();
7810 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
7811 // If this is a use of a previous tag, or if the tag is already declared
7812 // in the same scope (so that the definition/declaration completes or
7813 // rementions the tag), reuse the decl.
7814 if (TUK == TUK_Reference || TUK == TUK_Friend ||
7815 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) {
7816 // Make sure that this wasn't declared as an enum and now used as a
7817 // struct or something similar.
7818 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
7819 TUK == TUK_Definition, KWLoc,
7822 = (PrevTagDecl->getTagKind() != TTK_Enum &&
7825 Diag(KWLoc, diag::err_use_with_wrong_tag)
7827 << FixItHint::CreateReplacement(SourceRange(KWLoc),
7828 PrevTagDecl->getKindName());
7830 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
7831 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7834 Kind = PrevTagDecl->getTagKind();
7836 // Recover by making this an anonymous redefinition.
7843 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
7844 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
7846 // All conflicts with previous declarations are recovered by
7847 // returning the previous declaration.
7848 if (ScopedEnum != PrevEnum->isScoped()) {
7849 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch)
7850 << PrevEnum->isScoped();
7851 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7854 else if (EnumUnderlying && PrevEnum->isFixed()) {
7856 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
7859 T = QualType(EnumUnderlying.get<const Type*>(), 0);
7861 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) {
7862 Diag(NameLoc.isValid() ? NameLoc : KWLoc,
7863 diag::err_enum_redeclare_type_mismatch)
7865 << PrevEnum->getIntegerType();
7866 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7870 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) {
7871 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch)
7872 << PrevEnum->isFixed();
7873 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7879 // If this is a use, just return the declaration we found.
7881 // FIXME: In the future, return a variant or some other clue
7882 // for the consumer of this Decl to know it doesn't own it.
7883 // For our current ASTs this shouldn't be a problem, but will
7884 // need to be changed with DeclGroups.
7885 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() ||
7886 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend)
7889 // Diagnose attempts to redefine a tag.
7890 if (TUK == TUK_Definition) {
7891 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
7892 // If we're defining a specialization and the previous definition
7893 // is from an implicit instantiation, don't emit an error
7894 // here; we'll catch this in the general case below.
7895 if (!isExplicitSpecialization ||
7896 !isa<CXXRecordDecl>(Def) ||
7897 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
7898 == TSK_ExplicitSpecialization) {
7899 Diag(NameLoc, diag::err_redefinition) << Name;
7900 Diag(Def->getLocation(), diag::note_previous_definition);
7901 // If this is a redefinition, recover by making this
7902 // struct be anonymous, which will make any later
7903 // references get the previous definition.
7909 // If the type is currently being defined, complain
7910 // about a nested redefinition.
7912 = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
7913 if (Tag->isBeingDefined()) {
7914 Diag(NameLoc, diag::err_nested_redefinition) << Name;
7915 Diag(PrevTagDecl->getLocation(),
7916 diag::note_previous_definition);
7923 // Okay, this is definition of a previously declared or referenced
7924 // tag PrevDecl. We're going to create a new Decl for it.
7927 // If we get here we have (another) forward declaration or we
7928 // have a definition. Just create a new decl.
7931 // If we get here, this is a definition of a new tag type in a nested
7932 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
7933 // new decl/type. We set PrevDecl to NULL so that the entities
7934 // have distinct types.
7937 // If we get here, we're going to create a new Decl. If PrevDecl
7938 // is non-NULL, it's a definition of the tag declared by
7939 // PrevDecl. If it's NULL, we have a new definition.
7942 // Otherwise, PrevDecl is not a tag, but was found with tag
7943 // lookup. This is only actually possible in C++, where a few
7944 // things like templates still live in the tag namespace.
7946 assert(getLangOptions().CPlusPlus);
7948 // Use a better diagnostic if an elaborated-type-specifier
7949 // found the wrong kind of type on the first
7950 // (non-redeclaration) lookup.
7951 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
7952 !Previous.isForRedeclaration()) {
7954 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
7955 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
7956 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
7957 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
7958 Diag(PrevDecl->getLocation(), diag::note_declared_at);
7961 // Otherwise, only diagnose if the declaration is in scope.
7962 } else if (!isDeclInScope(PrevDecl, SearchDC, S,
7963 isExplicitSpecialization)) {
7966 // Diagnose implicit declarations introduced by elaborated types.
7967 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
7969 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
7970 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
7971 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
7972 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
7973 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
7976 // Otherwise it's a declaration. Call out a particularly common
7978 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
7980 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
7981 Diag(NameLoc, diag::err_tag_definition_of_typedef)
7982 << Name << Kind << TND->getUnderlyingType();
7983 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
7986 // Otherwise, diagnose.
7988 // The tag name clashes with something else in the target scope,
7989 // issue an error and recover by making this tag be anonymous.
7990 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
7991 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
7996 // The existing declaration isn't relevant to us; we're in a
7997 // new scope, so clear out the previous declaration.
8004 TagDecl *PrevDecl = 0;
8005 if (Previous.isSingleResult())
8006 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
8008 // If there is an identifier, use the location of the identifier as the
8009 // location of the decl, otherwise use the location of the struct/union
8011 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
8013 // Otherwise, create a new declaration. If there is a previous
8014 // declaration of the same entity, the two will be linked via
8018 bool IsForwardReference = false;
8019 if (Kind == TTK_Enum) {
8020 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
8021 // enum X { A, B, C } D; D should chain to X.
8022 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
8023 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
8024 ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
8025 // If this is an undefined enum, warn.
8026 if (TUK != TUK_Definition && !Invalid) {
8028 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) {
8029 // C++0x: 7.2p2: opaque-enum-declaration.
8030 // Conflicts are diagnosed above. Do nothing.
8032 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
8033 Diag(Loc, diag::ext_forward_ref_enum_def)
8035 Diag(Def->getLocation(), diag::note_previous_definition);
8037 unsigned DiagID = diag::ext_forward_ref_enum;
8038 if (getLangOptions().MicrosoftExt)
8039 DiagID = diag::ext_ms_forward_ref_enum;
8040 else if (getLangOptions().CPlusPlus)
8041 DiagID = diag::err_forward_ref_enum;
8044 // If this is a forward-declared reference to an enumeration, make a
8045 // note of it; we won't actually be introducing the declaration into
8046 // the declaration context.
8047 if (TUK == TUK_Reference)
8048 IsForwardReference = true;
8052 if (EnumUnderlying) {
8053 EnumDecl *ED = cast<EnumDecl>(New);
8054 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
8055 ED->setIntegerTypeSourceInfo(TI);
8057 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
8058 ED->setPromotionType(ED->getIntegerType());
8062 // struct/union/class
8064 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
8065 // struct X { int A; } D; D should chain to X.
8066 if (getLangOptions().CPlusPlus) {
8067 // FIXME: Look for a way to use RecordDecl for simple structs.
8068 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
8069 cast_or_null<CXXRecordDecl>(PrevDecl));
8071 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
8072 StdBadAlloc = cast<CXXRecordDecl>(New);
8074 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
8075 cast_or_null<RecordDecl>(PrevDecl));
8078 // Maybe add qualifier info.
8079 if (SS.isNotEmpty()) {
8081 New->setQualifierInfo(SS.getWithLocInContext(Context));
8082 if (TemplateParameterLists.size() > 0) {
8083 New->setTemplateParameterListsInfo(Context,
8084 TemplateParameterLists.size(),
8085 (TemplateParameterList**) TemplateParameterLists.release());
8092 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
8093 // Add alignment attributes if necessary; these attributes are checked when
8094 // the ASTContext lays out the structure.
8096 // It is important for implementing the correct semantics that this
8097 // happen here (in act on tag decl). The #pragma pack stack is
8098 // maintained as a result of parser callbacks which can occur at
8099 // many points during the parsing of a struct declaration (because
8100 // the #pragma tokens are effectively skipped over during the
8101 // parsing of the struct).
8102 AddAlignmentAttributesForRecord(RD);
8104 AddMsStructLayoutForRecord(RD);
8107 if (PrevDecl && PrevDecl->isModulePrivate())
8108 New->setModulePrivate();
8109 else if (ModulePrivateLoc.isValid()) {
8110 if (isExplicitSpecialization)
8111 Diag(New->getLocation(), diag::err_module_private_specialization)
8113 << FixItHint::CreateRemoval(ModulePrivateLoc);
8114 else if (PrevDecl && !PrevDecl->isModulePrivate())
8115 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc);
8116 // __module_private__ does not apply to local classes. However, we only
8117 // diagnose this as an error when the declaration specifiers are
8118 // freestanding. Here, we just ignore the __module_private__.
8120 else if (!SearchDC->isFunctionOrMethod())
8121 New->setModulePrivate();
8124 // If this is a specialization of a member class (of a class template),
8125 // check the specialization.
8126 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
8130 New->setInvalidDecl();
8133 ProcessDeclAttributeList(S, New, Attr);
8135 // If we're declaring or defining a tag in function prototype scope
8136 // in C, note that this type can only be used within the function.
8137 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus)
8138 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
8140 // Set the lexical context. If the tag has a C++ scope specifier, the
8141 // lexical context will be different from the semantic context.
8142 New->setLexicalDeclContext(CurContext);
8144 // Mark this as a friend decl if applicable.
8145 // In Microsoft mode, a friend declaration also acts as a forward
8146 // declaration so we always pass true to setObjectOfFriendDecl to make
8147 // the tag name visible.
8148 if (TUK == TUK_Friend)
8149 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() ||
8150 getLangOptions().MicrosoftExt);
8152 // Set the access specifier.
8153 if (!Invalid && SearchDC->isRecord())
8154 SetMemberAccessSpecifier(New, PrevDecl, AS);
8156 if (TUK == TUK_Definition)
8157 New->startDefinition();
8159 // If this has an identifier, add it to the scope stack.
8160 if (TUK == TUK_Friend) {
8161 // We might be replacing an existing declaration in the lookup tables;
8162 // if so, borrow its access specifier.
8164 New->setAccess(PrevDecl->getAccess());
8166 DeclContext *DC = New->getDeclContext()->getRedeclContext();
8167 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
8168 if (Name) // can be null along some error paths
8169 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
8170 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
8172 S = getNonFieldDeclScope(S);
8173 PushOnScopeChains(New, S, !IsForwardReference);
8174 if (IsForwardReference)
8175 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
8178 CurContext->addDecl(New);
8181 // If this is the C FILE type, notify the AST context.
8182 if (IdentifierInfo *II = New->getIdentifier())
8183 if (!New->isInvalidDecl() &&
8184 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
8186 Context.setFILEDecl(New);
8192 void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
8193 AdjustDeclIfTemplate(TagD);
8194 TagDecl *Tag = cast<TagDecl>(TagD);
8196 // Enter the tag context.
8197 PushDeclContext(S, Tag);
8200 Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
8201 assert(isa<ObjCContainerDecl>(IDecl) &&
8202 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
8203 DeclContext *OCD = cast<DeclContext>(IDecl);
8204 assert(getContainingDC(OCD) == CurContext &&
8205 "The next DeclContext should be lexically contained in the current one.");
8210 void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
8211 SourceLocation FinalLoc,
8212 SourceLocation LBraceLoc) {
8213 AdjustDeclIfTemplate(TagD);
8214 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
8216 FieldCollector->StartClass();
8218 if (!Record->getIdentifier())
8221 if (FinalLoc.isValid())
8222 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context));
8225 // [...] The class-name is also inserted into the scope of the
8226 // class itself; this is known as the injected-class-name. For
8227 // purposes of access checking, the injected-class-name is treated
8228 // as if it were a public member name.
8229 CXXRecordDecl *InjectedClassName
8230 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
8231 Record->getLocStart(), Record->getLocation(),
8232 Record->getIdentifier(),
8234 /*DelayTypeCreation=*/true);
8235 Context.getTypeDeclType(InjectedClassName, Record);
8236 InjectedClassName->setImplicit();
8237 InjectedClassName->setAccess(AS_public);
8238 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
8239 InjectedClassName->setDescribedClassTemplate(Template);
8240 PushOnScopeChains(InjectedClassName, S);
8241 assert(InjectedClassName->isInjectedClassName() &&
8242 "Broken injected-class-name");
8245 void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
8246 SourceLocation RBraceLoc) {
8247 AdjustDeclIfTemplate(TagD);
8248 TagDecl *Tag = cast<TagDecl>(TagD);
8249 Tag->setRBraceLoc(RBraceLoc);
8251 if (isa<CXXRecordDecl>(Tag))
8252 FieldCollector->FinishClass();
8254 // Exit this scope of this tag's definition.
8257 // Notify the consumer that we've defined a tag.
8258 Consumer.HandleTagDeclDefinition(Tag);
8261 void Sema::ActOnObjCContainerFinishDefinition() {
8262 // Exit this scope of this interface definition.
8266 void Sema::ActOnObjCTemporaryExitContainerContext() {
8267 OriginalLexicalContext = CurContext;
8268 ActOnObjCContainerFinishDefinition();
8271 void Sema::ActOnObjCReenterContainerContext() {
8272 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext));
8273 OriginalLexicalContext = 0;
8276 void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
8277 AdjustDeclIfTemplate(TagD);
8278 TagDecl *Tag = cast<TagDecl>(TagD);
8279 Tag->setInvalidDecl();
8281 // We're undoing ActOnTagStartDefinition here, not
8282 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
8283 // the FieldCollector.
8288 // Note that FieldName may be null for anonymous bitfields.
8289 bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
8290 QualType FieldTy, const Expr *BitWidth,
8292 // Default to true; that shouldn't confuse checks for emptiness
8296 // C99 6.7.2.1p4 - verify the field type.
8297 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
8298 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
8299 // Handle incomplete types with specific error.
8300 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
8303 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
8304 << FieldName << FieldTy << BitWidth->getSourceRange();
8305 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
8306 << FieldTy << BitWidth->getSourceRange();
8307 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
8308 UPPC_BitFieldWidth))
8311 // If the bit-width is type- or value-dependent, don't try to check
8313 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
8317 if (VerifyIntegerConstantExpression(BitWidth, &Value))
8320 if (Value != 0 && ZeroWidth)
8323 // Zero-width bitfield is ok for anonymous field.
8324 if (Value == 0 && FieldName)
8325 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
8327 if (Value.isSigned() && Value.isNegative()) {
8329 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
8330 << FieldName << Value.toString(10);
8331 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
8332 << Value.toString(10);
8335 if (!FieldTy->isDependentType()) {
8336 uint64_t TypeSize = Context.getTypeSize(FieldTy);
8337 if (Value.getZExtValue() > TypeSize) {
8338 if (!getLangOptions().CPlusPlus) {
8340 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
8341 << FieldName << (unsigned)Value.getZExtValue()
8342 << (unsigned)TypeSize;
8344 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
8345 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
8349 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
8350 << FieldName << (unsigned)Value.getZExtValue()
8351 << (unsigned)TypeSize;
8353 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
8354 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
8361 /// ActOnField - Each field of a C struct/union is passed into this in order
8362 /// to create a FieldDecl object for it.
8363 Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
8364 Declarator &D, Expr *BitfieldWidth) {
8365 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
8366 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
8367 /*HasInit=*/false, AS_public);
8371 /// HandleField - Analyze a field of a C struct or a C++ data member.
8373 FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
8374 SourceLocation DeclStart,
8375 Declarator &D, Expr *BitWidth, bool HasInit,
8376 AccessSpecifier AS) {
8377 IdentifierInfo *II = D.getIdentifier();
8378 SourceLocation Loc = DeclStart;
8379 if (II) Loc = D.getIdentifierLoc();
8381 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8382 QualType T = TInfo->getType();
8383 if (getLangOptions().CPlusPlus) {
8384 CheckExtraCXXDefaultArguments(D);
8386 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
8387 UPPC_DataMemberType)) {
8390 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
8394 DiagnoseFunctionSpecifiers(D);
8396 if (D.getDeclSpec().isThreadSpecified())
8397 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
8398 if (D.getDeclSpec().isConstexprSpecified())
8399 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
8402 // Check to see if this name was declared as a member previously
8403 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
8404 LookupName(Previous, S);
8405 assert((Previous.empty() || Previous.isOverloadedResult() ||
8406 Previous.isSingleResult())
8407 && "Lookup of member name should be either overloaded, single or null");
8409 // If the name is overloaded then get any declaration else get the single result
8410 NamedDecl *PrevDecl = Previous.isOverloadedResult() ?
8411 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>();
8413 if (PrevDecl && PrevDecl->isTemplateParameter()) {
8414 // Maybe we will complain about the shadowed template parameter.
8415 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
8416 // Just pretend that we didn't see the previous declaration.
8420 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
8424 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
8425 SourceLocation TSSL = D.getSourceRange().getBegin();
8427 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit,
8428 TSSL, AS, PrevDecl, &D);
8430 if (NewFD->isInvalidDecl())
8431 Record->setInvalidDecl();
8433 if (D.getDeclSpec().isModulePrivateSpecified())
8434 NewFD->setModulePrivate();
8436 if (NewFD->isInvalidDecl() && PrevDecl) {
8437 // Don't introduce NewFD into scope; there's already something
8438 // with the same name in the same scope.
8440 PushOnScopeChains(NewFD, S);
8442 Record->addDecl(NewFD);
8447 /// \brief Build a new FieldDecl and check its well-formedness.
8449 /// This routine builds a new FieldDecl given the fields name, type,
8450 /// record, etc. \p PrevDecl should refer to any previous declaration
8451 /// with the same name and in the same scope as the field to be
8454 /// \returns a new FieldDecl.
8456 /// \todo The Declarator argument is a hack. It will be removed once
8457 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
8458 TypeSourceInfo *TInfo,
8459 RecordDecl *Record, SourceLocation Loc,
8460 bool Mutable, Expr *BitWidth, bool HasInit,
8461 SourceLocation TSSL,
8462 AccessSpecifier AS, NamedDecl *PrevDecl,
8464 IdentifierInfo *II = Name.getAsIdentifierInfo();
8465 bool InvalidDecl = false;
8466 if (D) InvalidDecl = D->isInvalidType();
8468 // If we receive a broken type, recover by assuming 'int' and
8469 // marking this declaration as invalid.
8475 QualType EltTy = Context.getBaseElementType(T);
8476 if (!EltTy->isDependentType() &&
8477 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
8478 // Fields of incomplete type force their record to be invalid.
8479 Record->setInvalidDecl();
8483 // C99 6.7.2.1p8: A member of a structure or union may have any type other
8484 // than a variably modified type.
8485 if (!InvalidDecl && T->isVariablyModifiedType()) {
8486 bool SizeIsNegative;
8487 llvm::APSInt Oversized;
8488 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
8491 if (!FixedTy.isNull()) {
8492 Diag(Loc, diag::warn_illegal_constant_array_size);
8496 Diag(Loc, diag::err_typecheck_negative_array_size);
8497 else if (Oversized.getBoolValue())
8498 Diag(Loc, diag::err_array_too_large)
8499 << Oversized.toString(10);
8501 Diag(Loc, diag::err_typecheck_field_variable_size);
8506 // Fields can not have abstract class types
8507 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
8508 diag::err_abstract_type_in_decl,
8512 bool ZeroWidth = false;
8513 // If this is declared as a bit-field, check the bit-field.
8514 if (!InvalidDecl && BitWidth &&
8515 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
8521 // Check that 'mutable' is consistent with the type of the declaration.
8522 if (!InvalidDecl && Mutable) {
8523 unsigned DiagID = 0;
8524 if (T->isReferenceType())
8525 DiagID = diag::err_mutable_reference;
8526 else if (T.isConstQualified())
8527 DiagID = diag::err_mutable_const;
8530 SourceLocation ErrLoc = Loc;
8531 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
8532 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
8533 Diag(ErrLoc, DiagID);
8539 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
8540 BitWidth, Mutable, HasInit);
8542 NewFD->setInvalidDecl();
8544 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
8545 Diag(Loc, diag::err_duplicate_member) << II;
8546 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
8547 NewFD->setInvalidDecl();
8550 if (!InvalidDecl && getLangOptions().CPlusPlus) {
8551 if (Record->isUnion()) {
8552 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
8553 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
8554 if (RDecl->getDefinition()) {
8555 // C++ [class.union]p1: An object of a class with a non-trivial
8556 // constructor, a non-trivial copy constructor, a non-trivial
8557 // destructor, or a non-trivial copy assignment operator
8558 // cannot be a member of a union, nor can an array of such
8560 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD))
8561 NewFD->setInvalidDecl();
8565 // C++ [class.union]p1: If a union contains a member of reference type,
8566 // the program is ill-formed.
8567 if (EltTy->isReferenceType()) {
8568 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type)
8569 << NewFD->getDeclName() << EltTy;
8570 NewFD->setInvalidDecl();
8575 // FIXME: We need to pass in the attributes given an AST
8576 // representation, not a parser representation.
8578 // FIXME: What to pass instead of TUScope?
8579 ProcessDeclAttributes(TUScope, NewFD, *D);
8581 // In auto-retain/release, infer strong retension for fields of
8583 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
8584 NewFD->setInvalidDecl();
8586 if (T.isObjCGCWeak())
8587 Diag(Loc, diag::warn_attribute_weak_on_field);
8589 NewFD->setAccess(AS);
8593 bool Sema::CheckNontrivialField(FieldDecl *FD) {
8595 assert(getLangOptions().CPlusPlus && "valid check only for C++");
8597 if (FD->isInvalidDecl())
8600 QualType EltTy = Context.getBaseElementType(FD->getType());
8601 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
8602 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
8603 if (RDecl->getDefinition()) {
8604 // We check for copy constructors before constructors
8605 // because otherwise we'll never get complaints about
8606 // copy constructors.
8608 CXXSpecialMember member = CXXInvalid;
8609 if (!RDecl->hasTrivialCopyConstructor())
8610 member = CXXCopyConstructor;
8611 else if (!RDecl->hasTrivialDefaultConstructor())
8612 member = CXXDefaultConstructor;
8613 else if (!RDecl->hasTrivialCopyAssignment())
8614 member = CXXCopyAssignment;
8615 else if (!RDecl->hasTrivialDestructor())
8616 member = CXXDestructor;
8618 if (member != CXXInvalid) {
8619 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) {
8620 // Objective-C++ ARC: it is an error to have a non-trivial field of
8621 // a union. However, system headers in Objective-C programs
8622 // occasionally have Objective-C lifetime objects within unions,
8623 // and rather than cause the program to fail, we make those
8624 // members unavailable.
8625 SourceLocation Loc = FD->getLocation();
8626 if (getSourceManager().isInSystemHeader(Loc)) {
8627 if (!FD->hasAttr<UnavailableAttr>())
8628 FD->addAttr(new (Context) UnavailableAttr(Loc, Context,
8629 "this system field has retaining ownership"));
8634 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member)
8635 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
8636 DiagnoseNontrivial(RT, member);
8645 /// DiagnoseNontrivial - Given that a class has a non-trivial
8646 /// special member, figure out why.
8647 void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
8649 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
8651 // Check whether the member was user-declared.
8656 case CXXDefaultConstructor:
8657 if (RD->hasUserDeclaredConstructor()) {
8658 typedef CXXRecordDecl::ctor_iterator ctor_iter;
8659 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){
8660 const FunctionDecl *body = 0;
8662 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) {
8663 SourceLocation CtorLoc = ci->getLocation();
8664 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8669 llvm_unreachable("found no user-declared constructors");
8673 case CXXCopyConstructor:
8674 if (RD->hasUserDeclaredCopyConstructor()) {
8675 SourceLocation CtorLoc =
8676 RD->getCopyConstructor(0)->getLocation();
8677 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8682 case CXXMoveConstructor:
8683 if (RD->hasUserDeclaredMoveConstructor()) {
8684 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation();
8685 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8690 case CXXCopyAssignment:
8691 if (RD->hasUserDeclaredCopyAssignment()) {
8692 // FIXME: this should use the location of the copy
8693 // assignment, not the type.
8694 SourceLocation TyLoc = RD->getSourceRange().getBegin();
8695 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member;
8700 case CXXMoveAssignment:
8701 if (RD->hasUserDeclaredMoveAssignment()) {
8702 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation();
8703 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member;
8709 if (RD->hasUserDeclaredDestructor()) {
8710 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation();
8711 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8717 typedef CXXRecordDecl::base_class_iterator base_iter;
8719 // Virtual bases and members inhibit trivial copying/construction,
8720 // but not trivial destruction.
8721 if (member != CXXDestructor) {
8722 // Check for virtual bases. vbases includes indirect virtual bases,
8723 // so we just iterate through the direct bases.
8724 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
8725 if (bi->isVirtual()) {
8726 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
8727 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
8731 // Check for virtual methods.
8732 typedef CXXRecordDecl::method_iterator meth_iter;
8733 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
8735 if (mi->isVirtual()) {
8736 SourceLocation MLoc = mi->getSourceRange().getBegin();
8737 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
8743 bool (CXXRecordDecl::*hasTrivial)() const;
8745 case CXXDefaultConstructor:
8746 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break;
8747 case CXXCopyConstructor:
8748 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
8749 case CXXCopyAssignment:
8750 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
8752 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
8754 llvm_unreachable("unexpected special member");
8757 // Check for nontrivial bases (and recurse).
8758 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
8759 const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
8760 assert(BaseRT && "Don't know how to handle dependent bases");
8761 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
8762 if (!(BaseRecTy->*hasTrivial)()) {
8763 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
8764 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
8765 DiagnoseNontrivial(BaseRT, member);
8770 // Check for nontrivial members (and recurse).
8771 typedef RecordDecl::field_iterator field_iter;
8772 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
8774 QualType EltTy = Context.getBaseElementType((*fi)->getType());
8775 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
8776 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
8778 if (!(EltRD->*hasTrivial)()) {
8779 SourceLocation FLoc = (*fi)->getLocation();
8780 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
8781 DiagnoseNontrivial(EltRT, member);
8786 if (EltTy->isObjCLifetimeType()) {
8787 switch (EltTy.getObjCLifetime()) {
8788 case Qualifiers::OCL_None:
8789 case Qualifiers::OCL_ExplicitNone:
8792 case Qualifiers::OCL_Autoreleasing:
8793 case Qualifiers::OCL_Weak:
8794 case Qualifiers::OCL_Strong:
8795 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership)
8796 << QT << EltTy.getObjCLifetime();
8802 llvm_unreachable("found no explanation for non-trivial member");
8805 /// TranslateIvarVisibility - Translate visibility from a token ID to an
8807 static ObjCIvarDecl::AccessControl
8808 TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
8809 switch (ivarVisibility) {
8810 default: llvm_unreachable("Unknown visitibility kind");
8811 case tok::objc_private: return ObjCIvarDecl::Private;
8812 case tok::objc_public: return ObjCIvarDecl::Public;
8813 case tok::objc_protected: return ObjCIvarDecl::Protected;
8814 case tok::objc_package: return ObjCIvarDecl::Package;
8818 /// ActOnIvar - Each ivar field of an objective-c class is passed into this
8819 /// in order to create an IvarDecl object for it.
8820 Decl *Sema::ActOnIvar(Scope *S,
8821 SourceLocation DeclStart,
8822 Declarator &D, Expr *BitfieldWidth,
8823 tok::ObjCKeywordKind Visibility) {
8825 IdentifierInfo *II = D.getIdentifier();
8826 Expr *BitWidth = (Expr*)BitfieldWidth;
8827 SourceLocation Loc = DeclStart;
8828 if (II) Loc = D.getIdentifierLoc();
8830 // FIXME: Unnamed fields can be handled in various different ways, for
8831 // example, unnamed unions inject all members into the struct namespace!
8833 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8834 QualType T = TInfo->getType();
8837 // 6.7.2.1p3, 6.7.2.1p4
8838 if (VerifyBitField(Loc, II, T, BitWidth)) {
8848 if (T->isReferenceType()) {
8849 Diag(Loc, diag::err_ivar_reference_type);
8852 // C99 6.7.2.1p8: A member of a structure or union may have any type other
8853 // than a variably modified type.
8854 else if (T->isVariablyModifiedType()) {
8855 Diag(Loc, diag::err_typecheck_ivar_variable_size);
8859 // Get the visibility (access control) for this ivar.
8860 ObjCIvarDecl::AccessControl ac =
8861 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
8862 : ObjCIvarDecl::None;
8863 // Must set ivar's DeclContext to its enclosing interface.
8864 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
8865 ObjCContainerDecl *EnclosingContext;
8866 if (ObjCImplementationDecl *IMPDecl =
8867 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
8868 if (!LangOpts.ObjCNonFragileABI2) {
8869 // Case of ivar declared in an implementation. Context is that of its class.
8870 EnclosingContext = IMPDecl->getClassInterface();
8871 assert(EnclosingContext && "Implementation has no class interface!");
8874 EnclosingContext = EnclosingDecl;
8876 if (ObjCCategoryDecl *CDecl =
8877 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
8878 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) {
8879 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
8883 EnclosingContext = EnclosingDecl;
8886 // Construct the decl.
8887 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
8888 DeclStart, Loc, II, T,
8889 TInfo, ac, (Expr *)BitfieldWidth);
8892 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
8894 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
8895 && !isa<TagDecl>(PrevDecl)) {
8896 Diag(Loc, diag::err_duplicate_member) << II;
8897 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
8898 NewID->setInvalidDecl();
8902 // Process attributes attached to the ivar.
8903 ProcessDeclAttributes(S, NewID, D);
8905 if (D.isInvalidType())
8906 NewID->setInvalidDecl();
8908 // In ARC, infer 'retaining' for ivars of retainable type.
8909 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
8910 NewID->setInvalidDecl();
8912 if (D.getDeclSpec().isModulePrivateSpecified())
8913 NewID->setModulePrivate();
8916 // FIXME: When interfaces are DeclContexts, we'll need to add
8917 // these to the interface.
8919 IdResolver.AddDecl(NewID);
8925 /// ActOnLastBitfield - This routine handles synthesized bitfields rules for
8926 /// class and class extensions. For every class @interface and class
8927 /// extension @interface, if the last ivar is a bitfield of any type,
8928 /// then add an implicit `char :0` ivar to the end of that interface.
8929 void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
8930 SmallVectorImpl<Decl *> &AllIvarDecls) {
8931 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty())
8934 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
8935 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
8937 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
8939 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
8941 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
8942 if (!CD->IsClassExtension())
8945 // No need to add this to end of @implementation.
8949 // All conditions are met. Add a new bitfield to the tail end of ivars.
8950 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
8951 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
8953 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
8954 DeclLoc, DeclLoc, 0,
8956 Context.getTrivialTypeSourceInfo(Context.CharTy,
8958 ObjCIvarDecl::Private, BW,
8960 AllIvarDecls.push_back(Ivar);
8963 void Sema::ActOnFields(Scope* S,
8964 SourceLocation RecLoc, Decl *EnclosingDecl,
8965 llvm::ArrayRef<Decl *> Fields,
8966 SourceLocation LBrac, SourceLocation RBrac,
8967 AttributeList *Attr) {
8968 assert(EnclosingDecl && "missing record or interface decl");
8970 // If the decl this is being inserted into is invalid, then it may be a
8971 // redeclaration or some other bogus case. Don't try to add fields to it.
8972 if (EnclosingDecl->isInvalidDecl())
8975 // Verify that all the fields are okay.
8976 unsigned NumNamedMembers = 0;
8977 SmallVector<FieldDecl*, 32> RecFields;
8979 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
8980 bool ARCErrReported = false;
8981 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
8983 FieldDecl *FD = cast<FieldDecl>(*i);
8985 // Get the type for the field.
8986 const Type *FDTy = FD->getType().getTypePtr();
8988 if (!FD->isAnonymousStructOrUnion()) {
8989 // Remember all fields written by the user.
8990 RecFields.push_back(FD);
8993 // If the field is already invalid for some reason, don't emit more
8994 // diagnostics about it.
8995 if (FD->isInvalidDecl()) {
8996 EnclosingDecl->setInvalidDecl();
9001 // A structure or union shall not contain a member with
9002 // incomplete or function type (hence, a structure shall not
9003 // contain an instance of itself, but may contain a pointer to
9004 // an instance of itself), except that the last member of a
9005 // structure with more than one named member may have incomplete
9006 // array type; such a structure (and any union containing,
9007 // possibly recursively, a member that is such a structure)
9008 // shall not be a member of a structure or an element of an
9010 if (FDTy->isFunctionType()) {
9011 // Field declared as a function.
9012 Diag(FD->getLocation(), diag::err_field_declared_as_function)
9013 << FD->getDeclName();
9014 FD->setInvalidDecl();
9015 EnclosingDecl->setInvalidDecl();
9017 } else if (FDTy->isIncompleteArrayType() && Record &&
9018 ((i + 1 == Fields.end() && !Record->isUnion()) ||
9019 ((getLangOptions().MicrosoftExt ||
9020 getLangOptions().CPlusPlus) &&
9021 (i + 1 == Fields.end() || Record->isUnion())))) {
9022 // Flexible array member.
9023 // Microsoft and g++ is more permissive regarding flexible array.
9024 // It will accept flexible array in union and also
9025 // as the sole element of a struct/class.
9026 if (getLangOptions().MicrosoftExt) {
9027 if (Record->isUnion())
9028 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms)
9029 << FD->getDeclName();
9030 else if (Fields.size() == 1)
9031 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms)
9032 << FD->getDeclName() << Record->getTagKind();
9033 } else if (getLangOptions().CPlusPlus) {
9034 if (Record->isUnion())
9035 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
9036 << FD->getDeclName();
9037 else if (Fields.size() == 1)
9038 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu)
9039 << FD->getDeclName() << Record->getTagKind();
9040 } else if (NumNamedMembers < 1) {
9041 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
9042 << FD->getDeclName();
9043 FD->setInvalidDecl();
9044 EnclosingDecl->setInvalidDecl();
9047 if (!FD->getType()->isDependentType() &&
9048 !Context.getBaseElementType(FD->getType()).isPODType(Context)) {
9049 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
9050 << FD->getDeclName() << FD->getType();
9051 FD->setInvalidDecl();
9052 EnclosingDecl->setInvalidDecl();
9055 // Okay, we have a legal flexible array member at the end of the struct.
9057 Record->setHasFlexibleArrayMember(true);
9058 } else if (!FDTy->isDependentType() &&
9059 RequireCompleteType(FD->getLocation(), FD->getType(),
9060 diag::err_field_incomplete)) {
9062 FD->setInvalidDecl();
9063 EnclosingDecl->setInvalidDecl();
9065 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
9066 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
9067 // If this is a member of a union, then entire union becomes "flexible".
9068 if (Record && Record->isUnion()) {
9069 Record->setHasFlexibleArrayMember(true);
9071 // If this is a struct/class and this is not the last element, reject
9072 // it. Note that GCC supports variable sized arrays in the middle of
9074 if (i + 1 != Fields.end())
9075 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
9076 << FD->getDeclName() << FD->getType();
9078 // We support flexible arrays at the end of structs in
9079 // other structs as an extension.
9080 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
9081 << FD->getDeclName();
9083 Record->setHasFlexibleArrayMember(true);
9087 if (Record && FDTTy->getDecl()->hasObjectMember())
9088 Record->setHasObjectMember(true);
9089 } else if (FDTy->isObjCObjectType()) {
9090 /// A field cannot be an Objective-c object
9091 Diag(FD->getLocation(), diag::err_statically_allocated_object)
9092 << FixItHint::CreateInsertion(FD->getLocation(), "*");
9093 QualType T = Context.getObjCObjectPointerType(FD->getType());
9096 else if (!getLangOptions().CPlusPlus) {
9097 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) {
9098 // It's an error in ARC if a field has lifetime.
9099 // We don't want to report this in a system header, though,
9100 // so we just make the field unavailable.
9101 // FIXME: that's really not sufficient; we need to make the type
9102 // itself invalid to, say, initialize or copy.
9103 QualType T = FD->getType();
9104 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
9105 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
9106 SourceLocation loc = FD->getLocation();
9107 if (getSourceManager().isInSystemHeader(loc)) {
9108 if (!FD->hasAttr<UnavailableAttr>()) {
9109 FD->addAttr(new (Context) UnavailableAttr(loc, Context,
9110 "this system field has retaining ownership"));
9113 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct);
9115 ARCErrReported = true;
9118 else if (getLangOptions().ObjC1 &&
9119 getLangOptions().getGC() != LangOptions::NonGC &&
9120 Record && !Record->hasObjectMember()) {
9121 if (FD->getType()->isObjCObjectPointerType() ||
9122 FD->getType().isObjCGCStrong())
9123 Record->setHasObjectMember(true);
9124 else if (Context.getAsArrayType(FD->getType())) {
9125 QualType BaseType = Context.getBaseElementType(FD->getType());
9126 if (BaseType->isRecordType() &&
9127 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
9128 Record->setHasObjectMember(true);
9129 else if (BaseType->isObjCObjectPointerType() ||
9130 BaseType.isObjCGCStrong())
9131 Record->setHasObjectMember(true);
9135 // Keep track of the number of named members.
9136 if (FD->getIdentifier())
9140 // Okay, we successfully defined 'Record'.
9142 bool Completed = false;
9143 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
9144 if (!CXXRecord->isInvalidDecl()) {
9145 // Set access bits correctly on the directly-declared conversions.
9146 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions();
9147 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end();
9149 Convs->setAccess(I, (*I)->getAccess());
9151 if (!CXXRecord->isDependentType()) {
9152 // Objective-C Automatic Reference Counting:
9153 // If a class has a non-static data member of Objective-C pointer
9154 // type (or array thereof), it is a non-POD type and its
9155 // default constructor (if any), copy constructor, copy assignment
9156 // operator, and destructor are non-trivial.
9158 // This rule is also handled by CXXRecordDecl::completeDefinition().
9159 // However, here we check whether this particular class is only
9160 // non-POD because of the presence of an Objective-C pointer member.
9161 // If so, objects of this type cannot be shared between code compiled
9162 // with instant objects and code compiled with manual retain/release.
9163 if (getLangOptions().ObjCAutoRefCount &&
9164 CXXRecord->hasObjectMember() &&
9165 CXXRecord->getLinkage() == ExternalLinkage) {
9166 if (CXXRecord->isPOD()) {
9167 Diag(CXXRecord->getLocation(),
9168 diag::warn_arc_non_pod_class_with_object_member)
9171 // FIXME: Fix-Its would be nice here, but finding a good location
9172 // for them is going to be tricky.
9173 if (CXXRecord->hasTrivialCopyConstructor())
9174 Diag(CXXRecord->getLocation(),
9175 diag::warn_arc_trivial_member_function_with_object_member)
9177 if (CXXRecord->hasTrivialCopyAssignment())
9178 Diag(CXXRecord->getLocation(),
9179 diag::warn_arc_trivial_member_function_with_object_member)
9181 if (CXXRecord->hasTrivialDestructor())
9182 Diag(CXXRecord->getLocation(),
9183 diag::warn_arc_trivial_member_function_with_object_member)
9188 // Adjust user-defined destructor exception spec.
9189 if (getLangOptions().CPlusPlus0x &&
9190 CXXRecord->hasUserDeclaredDestructor())
9191 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor());
9193 // Add any implicitly-declared members to this class.
9194 AddImplicitlyDeclaredMembersToClass(CXXRecord);
9196 // If we have virtual base classes, we may end up finding multiple
9197 // final overriders for a given virtual function. Check for this
9199 if (CXXRecord->getNumVBases()) {
9200 CXXFinalOverriderMap FinalOverriders;
9201 CXXRecord->getFinalOverriders(FinalOverriders);
9203 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
9204 MEnd = FinalOverriders.end();
9206 for (OverridingMethods::iterator SO = M->second.begin(),
9207 SOEnd = M->second.end();
9208 SO != SOEnd; ++SO) {
9209 assert(SO->second.size() > 0 &&
9210 "Virtual function without overridding functions?");
9211 if (SO->second.size() == 1)
9214 // C++ [class.virtual]p2:
9215 // In a derived class, if a virtual member function of a base
9216 // class subobject has more than one final overrider the
9217 // program is ill-formed.
9218 Diag(Record->getLocation(), diag::err_multiple_final_overriders)
9219 << (NamedDecl *)M->first << Record;
9220 Diag(M->first->getLocation(),
9221 diag::note_overridden_virtual_function);
9222 for (OverridingMethods::overriding_iterator
9223 OM = SO->second.begin(),
9224 OMEnd = SO->second.end();
9226 Diag(OM->Method->getLocation(), diag::note_final_overrider)
9227 << (NamedDecl *)M->first << OM->Method->getParent();
9229 Record->setInvalidDecl();
9232 CXXRecord->completeDefinition(&FinalOverriders);
9240 Record->completeDefinition();
9242 // Now that the record is complete, do any delayed exception spec checks
9244 while (!DelayedDestructorExceptionSpecChecks.empty()) {
9245 const CXXDestructorDecl *Dtor =
9246 DelayedDestructorExceptionSpecChecks.back().first;
9247 if (Dtor->getParent() != Record)
9250 assert(!Dtor->getParent()->isDependentType() &&
9251 "Should not ever add destructors of templates into the list.");
9252 CheckOverridingFunctionExceptionSpec(Dtor,
9253 DelayedDestructorExceptionSpecChecks.back().second);
9254 DelayedDestructorExceptionSpecChecks.pop_back();
9258 ObjCIvarDecl **ClsFields =
9259 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
9260 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
9261 ID->setLocEnd(RBrac);
9262 // Add ivar's to class's DeclContext.
9263 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
9264 ClsFields[i]->setLexicalDeclContext(ID);
9265 ID->addDecl(ClsFields[i]);
9267 // Must enforce the rule that ivars in the base classes may not be
9269 if (ID->getSuperClass())
9270 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
9271 } else if (ObjCImplementationDecl *IMPDecl =
9272 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
9273 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
9274 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
9275 // Ivar declared in @implementation never belongs to the implementation.
9276 // Only it is in implementation's lexical context.
9277 ClsFields[I]->setLexicalDeclContext(IMPDecl);
9278 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
9279 } else if (ObjCCategoryDecl *CDecl =
9280 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
9281 // case of ivars in class extension; all other cases have been
9282 // reported as errors elsewhere.
9283 // FIXME. Class extension does not have a LocEnd field.
9284 // CDecl->setLocEnd(RBrac);
9285 // Add ivar's to class extension's DeclContext.
9286 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
9287 ClsFields[i]->setLexicalDeclContext(CDecl);
9288 CDecl->addDecl(ClsFields[i]);
9294 ProcessDeclAttributeList(S, Record, Attr);
9296 // If there's a #pragma GCC visibility in scope, and this isn't a subclass,
9297 // set the visibility of this record.
9298 if (Record && !Record->getDeclContext()->isRecord())
9299 AddPushedVisibilityAttribute(Record);
9302 /// \brief Determine whether the given integral value is representable within
9303 /// the given type T.
9304 static bool isRepresentableIntegerValue(ASTContext &Context,
9305 llvm::APSInt &Value,
9307 assert(T->isIntegralType(Context) && "Integral type required!");
9308 unsigned BitWidth = Context.getIntWidth(T);
9310 if (Value.isUnsigned() || Value.isNonNegative()) {
9311 if (T->isSignedIntegerOrEnumerationType())
9313 return Value.getActiveBits() <= BitWidth;
9315 return Value.getMinSignedBits() <= BitWidth;
9318 // \brief Given an integral type, return the next larger integral type
9319 // (or a NULL type of no such type exists).
9320 static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
9321 // FIXME: Int128/UInt128 support, which also needs to be introduced into
9322 // enum checking below.
9323 assert(T->isIntegralType(Context) && "Integral type required!");
9324 const unsigned NumTypes = 4;
9325 QualType SignedIntegralTypes[NumTypes] = {
9326 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
9328 QualType UnsignedIntegralTypes[NumTypes] = {
9329 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
9330 Context.UnsignedLongLongTy
9333 unsigned BitWidth = Context.getTypeSize(T);
9334 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
9335 : UnsignedIntegralTypes;
9336 for (unsigned I = 0; I != NumTypes; ++I)
9337 if (Context.getTypeSize(Types[I]) > BitWidth)
9343 EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
9344 EnumConstantDecl *LastEnumConst,
9345 SourceLocation IdLoc,
9348 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
9349 llvm::APSInt EnumVal(IntWidth);
9352 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
9356 if (Enum->isDependentType() || Val->isTypeDependent())
9357 EltTy = Context.DependentTy;
9359 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
9360 SourceLocation ExpLoc;
9361 if (!Val->isValueDependent() &&
9362 VerifyIntegerConstantExpression(Val, &EnumVal)) {
9365 if (!getLangOptions().CPlusPlus) {
9367 // The expression that defines the value of an enumeration constant
9368 // shall be an integer constant expression that has a value
9369 // representable as an int.
9371 // Complain if the value is not representable in an int.
9372 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
9373 Diag(IdLoc, diag::ext_enum_value_not_int)
9374 << EnumVal.toString(10) << Val->getSourceRange()
9375 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
9376 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
9377 // Force the type of the expression to 'int'.
9378 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take();
9382 if (Enum->isFixed()) {
9383 EltTy = Enum->getIntegerType();
9385 // C++0x [dcl.enum]p5:
9386 // ... if the initializing value of an enumerator cannot be
9387 // represented by the underlying type, the program is ill-formed.
9388 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
9389 if (getLangOptions().MicrosoftExt) {
9390 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
9391 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
9393 Diag(IdLoc, diag::err_enumerator_too_large)
9396 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
9399 // C++0x [dcl.enum]p5:
9400 // If the underlying type is not fixed, the type of each enumerator
9401 // is the type of its initializing value:
9402 // - If an initializer is specified for an enumerator, the
9403 // initializing value has the same type as the expression.
9404 EltTy = Val->getType();
9411 if (Enum->isDependentType())
9412 EltTy = Context.DependentTy;
9413 else if (!LastEnumConst) {
9414 // C++0x [dcl.enum]p5:
9415 // If the underlying type is not fixed, the type of each enumerator
9416 // is the type of its initializing value:
9417 // - If no initializer is specified for the first enumerator, the
9418 // initializing value has an unspecified integral type.
9420 // GCC uses 'int' for its unspecified integral type, as does
9422 if (Enum->isFixed()) {
9423 EltTy = Enum->getIntegerType();
9426 EltTy = Context.IntTy;
9429 // Assign the last value + 1.
9430 EnumVal = LastEnumConst->getInitVal();
9432 EltTy = LastEnumConst->getType();
9434 // Check for overflow on increment.
9435 if (EnumVal < LastEnumConst->getInitVal()) {
9436 // C++0x [dcl.enum]p5:
9437 // If the underlying type is not fixed, the type of each enumerator
9438 // is the type of its initializing value:
9440 // - Otherwise the type of the initializing value is the same as
9441 // the type of the initializing value of the preceding enumerator
9442 // unless the incremented value is not representable in that type,
9443 // in which case the type is an unspecified integral type
9444 // sufficient to contain the incremented value. If no such type
9445 // exists, the program is ill-formed.
9446 QualType T = getNextLargerIntegralType(Context, EltTy);
9447 if (T.isNull() || Enum->isFixed()) {
9448 // There is no integral type larger enough to represent this
9449 // value. Complain, then allow the value to wrap around.
9450 EnumVal = LastEnumConst->getInitVal();
9451 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
9453 if (Enum->isFixed())
9454 // When the underlying type is fixed, this is ill-formed.
9455 Diag(IdLoc, diag::err_enumerator_wrapped)
9456 << EnumVal.toString(10)
9459 Diag(IdLoc, diag::warn_enumerator_too_large)
9460 << EnumVal.toString(10);
9465 // Retrieve the last enumerator's value, extent that type to the
9466 // type that is supposed to be large enough to represent the incremented
9467 // value, then increment.
9468 EnumVal = LastEnumConst->getInitVal();
9469 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
9470 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
9473 // If we're not in C++, diagnose the overflow of enumerator values,
9474 // which in C99 means that the enumerator value is not representable in
9475 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
9476 // permits enumerator values that are representable in some larger
9478 if (!getLangOptions().CPlusPlus && !T.isNull())
9479 Diag(IdLoc, diag::warn_enum_value_overflow);
9480 } else if (!getLangOptions().CPlusPlus &&
9481 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
9482 // Enforce C99 6.7.2.2p2 even when we compute the next value.
9483 Diag(IdLoc, diag::ext_enum_value_not_int)
9484 << EnumVal.toString(10) << 1;
9489 if (!EltTy->isDependentType()) {
9490 // Make the enumerator value match the signedness and size of the
9491 // enumerator's type.
9492 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
9493 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
9496 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
9501 Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
9502 SourceLocation IdLoc, IdentifierInfo *Id,
9503 AttributeList *Attr,
9504 SourceLocation EqualLoc, Expr *val) {
9505 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
9506 EnumConstantDecl *LastEnumConst =
9507 cast_or_null<EnumConstantDecl>(lastEnumConst);
9508 Expr *Val = static_cast<Expr*>(val);
9510 // The scope passed in may not be a decl scope. Zip up the scope tree until
9511 // we find one that is.
9512 S = getNonFieldDeclScope(S);
9514 // Verify that there isn't already something declared with this name in this
9516 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
9518 if (PrevDecl && PrevDecl->isTemplateParameter()) {
9519 // Maybe we will complain about the shadowed template parameter.
9520 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
9521 // Just pretend that we didn't see the previous declaration.
9526 // When in C++, we may get a TagDecl with the same name; in this case the
9527 // enum constant will 'hide' the tag.
9528 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
9529 "Received TagDecl when not in C++!");
9530 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
9531 if (isa<EnumConstantDecl>(PrevDecl))
9532 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
9534 Diag(IdLoc, diag::err_redefinition) << Id;
9535 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
9540 // C++ [class.mem]p13:
9541 // If T is the name of a class, then each of the following shall have a
9542 // name different from T:
9543 // - every enumerator of every member of class T that is an enumerated
9545 if (CXXRecordDecl *Record
9546 = dyn_cast<CXXRecordDecl>(
9547 TheEnumDecl->getDeclContext()->getRedeclContext()))
9548 if (Record->getIdentifier() && Record->getIdentifier() == Id)
9549 Diag(IdLoc, diag::err_member_name_of_class) << Id;
9551 EnumConstantDecl *New =
9552 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
9555 // Process attributes.
9556 if (Attr) ProcessDeclAttributeList(S, New, Attr);
9558 // Register this decl in the current scope stack.
9559 New->setAccess(TheEnumDecl->getAccess());
9560 PushOnScopeChains(New, S);
9566 void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
9567 SourceLocation RBraceLoc, Decl *EnumDeclX,
9568 Decl **Elements, unsigned NumElements,
9569 Scope *S, AttributeList *Attr) {
9570 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
9571 QualType EnumType = Context.getTypeDeclType(Enum);
9574 ProcessDeclAttributeList(S, Enum, Attr);
9576 if (Enum->isDependentType()) {
9577 for (unsigned i = 0; i != NumElements; ++i) {
9578 EnumConstantDecl *ECD =
9579 cast_or_null<EnumConstantDecl>(Elements[i]);
9582 ECD->setType(EnumType);
9585 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
9589 // TODO: If the result value doesn't fit in an int, it must be a long or long
9590 // long value. ISO C does not support this, but GCC does as an extension,
9592 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
9593 unsigned CharWidth = Context.getTargetInfo().getCharWidth();
9594 unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
9596 // Verify that all the values are okay, compute the size of the values, and
9597 // reverse the list.
9598 unsigned NumNegativeBits = 0;
9599 unsigned NumPositiveBits = 0;
9601 // Keep track of whether all elements have type int.
9602 bool AllElementsInt = true;
9604 for (unsigned i = 0; i != NumElements; ++i) {
9605 EnumConstantDecl *ECD =
9606 cast_or_null<EnumConstantDecl>(Elements[i]);
9607 if (!ECD) continue; // Already issued a diagnostic.
9609 const llvm::APSInt &InitVal = ECD->getInitVal();
9611 // Keep track of the size of positive and negative values.
9612 if (InitVal.isUnsigned() || InitVal.isNonNegative())
9613 NumPositiveBits = std::max(NumPositiveBits,
9614 (unsigned)InitVal.getActiveBits());
9616 NumNegativeBits = std::max(NumNegativeBits,
9617 (unsigned)InitVal.getMinSignedBits());
9619 // Keep track of whether every enum element has type int (very commmon).
9621 AllElementsInt = ECD->getType() == Context.IntTy;
9624 // Figure out the type that should be used for this enum.
9628 // C++0x N3000 [conv.prom]p3:
9629 // An rvalue of an unscoped enumeration type whose underlying
9630 // type is not fixed can be converted to an rvalue of the first
9631 // of the following types that can represent all the values of
9632 // the enumeration: int, unsigned int, long int, unsigned long
9633 // int, long long int, or unsigned long long int.
9635 // An identifier declared as an enumeration constant has type int.
9636 // The C99 rule is modified by a gcc extension
9637 QualType BestPromotionType;
9639 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
9640 // -fshort-enums is the equivalent to specifying the packed attribute on all
9641 // enum definitions.
9642 if (LangOpts.ShortEnums)
9645 if (Enum->isFixed()) {
9646 BestType = BestPromotionType = Enum->getIntegerType();
9647 // We don't need to set BestWidth, because BestType is going to be the type
9648 // of the enumerators, but we do anyway because otherwise some compilers
9649 // warn that it might be used uninitialized.
9650 BestWidth = CharWidth;
9652 else if (NumNegativeBits) {
9653 // If there is a negative value, figure out the smallest integer type (of
9654 // int/long/longlong) that fits.
9655 // If it's packed, check also if it fits a char or a short.
9656 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
9657 BestType = Context.SignedCharTy;
9658 BestWidth = CharWidth;
9659 } else if (Packed && NumNegativeBits <= ShortWidth &&
9660 NumPositiveBits < ShortWidth) {
9661 BestType = Context.ShortTy;
9662 BestWidth = ShortWidth;
9663 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
9664 BestType = Context.IntTy;
9665 BestWidth = IntWidth;
9667 BestWidth = Context.getTargetInfo().getLongWidth();
9669 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
9670 BestType = Context.LongTy;
9672 BestWidth = Context.getTargetInfo().getLongLongWidth();
9674 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
9675 Diag(Enum->getLocation(), diag::warn_enum_too_large);
9676 BestType = Context.LongLongTy;
9679 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
9681 // If there is no negative value, figure out the smallest type that fits
9682 // all of the enumerator values.
9683 // If it's packed, check also if it fits a char or a short.
9684 if (Packed && NumPositiveBits <= CharWidth) {
9685 BestType = Context.UnsignedCharTy;
9686 BestPromotionType = Context.IntTy;
9687 BestWidth = CharWidth;
9688 } else if (Packed && NumPositiveBits <= ShortWidth) {
9689 BestType = Context.UnsignedShortTy;
9690 BestPromotionType = Context.IntTy;
9691 BestWidth = ShortWidth;
9692 } else if (NumPositiveBits <= IntWidth) {
9693 BestType = Context.UnsignedIntTy;
9694 BestWidth = IntWidth;
9696 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
9697 ? Context.UnsignedIntTy : Context.IntTy;
9698 } else if (NumPositiveBits <=
9699 (BestWidth = Context.getTargetInfo().getLongWidth())) {
9700 BestType = Context.UnsignedLongTy;
9702 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
9703 ? Context.UnsignedLongTy : Context.LongTy;
9705 BestWidth = Context.getTargetInfo().getLongLongWidth();
9706 assert(NumPositiveBits <= BestWidth &&
9707 "How could an initializer get larger than ULL?");
9708 BestType = Context.UnsignedLongLongTy;
9710 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
9711 ? Context.UnsignedLongLongTy : Context.LongLongTy;
9715 // Loop over all of the enumerator constants, changing their types to match
9716 // the type of the enum if needed.
9717 for (unsigned i = 0; i != NumElements; ++i) {
9718 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
9719 if (!ECD) continue; // Already issued a diagnostic.
9721 // Standard C says the enumerators have int type, but we allow, as an
9722 // extension, the enumerators to be larger than int size. If each
9723 // enumerator value fits in an int, type it as an int, otherwise type it the
9724 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
9725 // that X has type 'int', not 'unsigned'.
9727 // Determine whether the value fits into an int.
9728 llvm::APSInt InitVal = ECD->getInitVal();
9730 // If it fits into an integer type, force it. Otherwise force it to match
9731 // the enum decl type.
9735 if (!getLangOptions().CPlusPlus &&
9736 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
9737 NewTy = Context.IntTy;
9738 NewWidth = IntWidth;
9740 } else if (ECD->getType() == BestType) {
9741 // Already the right type!
9742 if (getLangOptions().CPlusPlus)
9743 // C++ [dcl.enum]p4: Following the closing brace of an
9744 // enum-specifier, each enumerator has the type of its
9746 ECD->setType(EnumType);
9750 NewWidth = BestWidth;
9751 NewSign = BestType->isSignedIntegerOrEnumerationType();
9754 // Adjust the APSInt value.
9755 InitVal = InitVal.extOrTrunc(NewWidth);
9756 InitVal.setIsSigned(NewSign);
9757 ECD->setInitVal(InitVal);
9759 // Adjust the Expr initializer and type.
9760 if (ECD->getInitExpr() &&
9761 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
9762 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
9767 if (getLangOptions().CPlusPlus)
9768 // C++ [dcl.enum]p4: Following the closing brace of an
9769 // enum-specifier, each enumerator has the type of its
9771 ECD->setType(EnumType);
9773 ECD->setType(NewTy);
9776 Enum->completeDefinition(BestType, BestPromotionType,
9777 NumPositiveBits, NumNegativeBits);
9780 Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
9781 SourceLocation StartLoc,
9782 SourceLocation EndLoc) {
9783 StringLiteral *AsmString = cast<StringLiteral>(expr);
9785 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
9786 AsmString, StartLoc,
9788 CurContext->addDecl(New);
9792 DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc,
9793 IdentifierInfo &ModuleName,
9794 SourceLocation ModuleNameLoc) {
9795 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc,
9796 ModuleName, ModuleNameLoc);
9800 // FIXME: Actually create a declaration to describe the module import.
9802 return DeclResult((Decl *)0);
9806 Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old,
9807 SourceLocation ModulePrivateKeyword) {
9808 assert(!Old->isModulePrivate() && "Old is module-private!");
9810 Diag(New->getLocation(), diag::err_module_private_follows_public)
9811 << New->getDeclName() << SourceRange(ModulePrivateKeyword);
9812 Diag(Old->getLocation(), diag::note_previous_declaration)
9813 << Old->getDeclName();
9815 // Drop the __module_private__ from the new declaration, since it's invalid.
9816 New->setModulePrivate(false);
9819 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
9820 SourceLocation PragmaLoc,
9821 SourceLocation NameLoc) {
9822 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
9825 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
9827 (void)WeakUndeclaredIdentifiers.insert(
9828 std::pair<IdentifierInfo*,WeakInfo>
9829 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
9833 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
9834 IdentifierInfo* AliasName,
9835 SourceLocation PragmaLoc,
9836 SourceLocation NameLoc,
9837 SourceLocation AliasNameLoc) {
9838 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
9839 LookupOrdinaryName);
9840 WeakInfo W = WeakInfo(Name, NameLoc);
9843 if (!PrevDecl->hasAttr<AliasAttr>())
9844 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
9845 DeclApplyPragmaWeak(TUScope, ND, W);
9847 (void)WeakUndeclaredIdentifiers.insert(
9848 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
9852 Decl *Sema::getObjCDeclContext() const {
9853 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));
9856 AvailabilityResult Sema::getCurContextAvailability() const {
9857 const Decl *D = cast<Decl>(getCurLexicalContext());
9858 // A category implicitly has the availability of the interface.
9859 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D))
9860 D = CatD->getClassInterface();
9862 return D->getAvailability();