1 //===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC 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 Objective C declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/Sema/Lookup.h"
16 #include "clang/Sema/ExternalSemaSource.h"
17 #include "clang/Sema/Scope.h"
18 #include "clang/Sema/ScopeInfo.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/DeclObjC.h"
22 #include "clang/Sema/DeclSpec.h"
23 #include "llvm/ADT/DenseSet.h"
25 using namespace clang;
27 bool Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
28 const ObjCMethodDecl *Overridden,
29 bool IsImplementation) {
30 if (Overridden->hasRelatedResultType() &&
31 !NewMethod->hasRelatedResultType()) {
32 // This can only happen when the method follows a naming convention that
33 // implies a related result type, and the original (overridden) method has
34 // a suitable return type, but the new (overriding) method does not have
35 // a suitable return type.
36 QualType ResultType = NewMethod->getResultType();
37 SourceRange ResultTypeRange;
38 if (const TypeSourceInfo *ResultTypeInfo
39 = NewMethod->getResultTypeSourceInfo())
40 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange();
42 // Figure out which class this method is part of, if any.
43 ObjCInterfaceDecl *CurrentClass
44 = dyn_cast<ObjCInterfaceDecl>(NewMethod->getDeclContext());
46 DeclContext *DC = NewMethod->getDeclContext();
47 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(DC))
48 CurrentClass = Cat->getClassInterface();
49 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(DC))
50 CurrentClass = Impl->getClassInterface();
51 else if (ObjCCategoryImplDecl *CatImpl
52 = dyn_cast<ObjCCategoryImplDecl>(DC))
53 CurrentClass = CatImpl->getClassInterface();
57 Diag(NewMethod->getLocation(),
58 diag::warn_related_result_type_compatibility_class)
59 << Context.getObjCInterfaceType(CurrentClass)
63 Diag(NewMethod->getLocation(),
64 diag::warn_related_result_type_compatibility_protocol)
69 Diag(Overridden->getLocation(), diag::note_related_result_type_overridden)
70 << Overridden->getMethodFamily();
77 static bool CheckObjCMethodOverrides(Sema &S, ObjCMethodDecl *NewMethod,
79 bool SkipCurrent = true) {
84 // Look for this method. If we find it, we're done.
85 Selector Sel = NewMethod->getSelector();
86 bool IsInstance = NewMethod->isInstanceMethod();
87 DeclContext::lookup_const_iterator Meth, MethEnd;
88 for (llvm::tie(Meth, MethEnd) = DC->lookup(Sel); Meth != MethEnd; ++Meth) {
89 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(*Meth);
90 if (MD && MD->isInstanceMethod() == IsInstance)
91 return S.CheckObjCMethodOverride(NewMethod, MD, false);
95 if (ObjCInterfaceDecl *Class = llvm::dyn_cast<ObjCInterfaceDecl>(DC)) {
96 // Look through categories.
97 for (ObjCCategoryDecl *Category = Class->getCategoryList();
98 Category; Category = Category->getNextClassCategory()) {
99 if (CheckObjCMethodOverrides(S, NewMethod, Category, false))
103 // Look through protocols.
104 for (ObjCList<ObjCProtocolDecl>::iterator I = Class->protocol_begin(),
105 IEnd = Class->protocol_end();
107 if (CheckObjCMethodOverrides(S, NewMethod, *I, false))
110 // Look in our superclass.
111 return CheckObjCMethodOverrides(S, NewMethod, Class->getSuperClass(),
115 if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(DC)) {
116 // Look through protocols.
117 for (ObjCList<ObjCProtocolDecl>::iterator I = Category->protocol_begin(),
118 IEnd = Category->protocol_end();
120 if (CheckObjCMethodOverrides(S, NewMethod, *I, false))
126 if (ObjCProtocolDecl *Protocol = dyn_cast<ObjCProtocolDecl>(DC)) {
127 // Look through protocols.
128 for (ObjCList<ObjCProtocolDecl>::iterator I = Protocol->protocol_begin(),
129 IEnd = Protocol->protocol_end();
131 if (CheckObjCMethodOverrides(S, NewMethod, *I, false))
140 bool Sema::CheckObjCMethodOverrides(ObjCMethodDecl *NewMethod,
142 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(DC))
143 return ::CheckObjCMethodOverrides(*this, NewMethod, Class);
145 if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(DC))
146 return ::CheckObjCMethodOverrides(*this, NewMethod, Category);
148 if (ObjCProtocolDecl *Protocol = dyn_cast<ObjCProtocolDecl>(DC))
149 return ::CheckObjCMethodOverrides(*this, NewMethod, Protocol);
151 if (ObjCImplementationDecl *Impl = dyn_cast<ObjCImplementationDecl>(DC))
152 return ::CheckObjCMethodOverrides(*this, NewMethod,
153 Impl->getClassInterface());
155 if (ObjCCategoryImplDecl *CatImpl = dyn_cast<ObjCCategoryImplDecl>(DC))
156 return ::CheckObjCMethodOverrides(*this, NewMethod,
157 CatImpl->getClassInterface());
159 return ::CheckObjCMethodOverrides(*this, NewMethod, CurContext);
162 static void DiagnoseObjCImplementedDeprecations(Sema &S,
164 SourceLocation ImplLoc,
166 if (ND && ND->isDeprecated()) {
167 S.Diag(ImplLoc, diag::warn_deprecated_def) << select;
169 S.Diag(ND->getLocation(), diag::note_method_declared_at);
171 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class";
175 /// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible
176 /// and user declared, in the method definition's AST.
177 void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) {
178 assert(getCurMethodDecl() == 0 && "Method parsing confused");
179 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D);
181 // If we don't have a valid method decl, simply return.
185 // Allow the rest of sema to find private method decl implementations.
186 if (MDecl->isInstanceMethod())
187 AddInstanceMethodToGlobalPool(MDecl, true);
189 AddFactoryMethodToGlobalPool(MDecl, true);
191 // Allow all of Sema to see that we are entering a method definition.
192 PushDeclContext(FnBodyScope, MDecl);
195 // Create Decl objects for each parameter, entrring them in the scope for
196 // binding to their use.
198 // Insert the invisible arguments, self and _cmd!
199 MDecl->createImplicitParams(Context, MDecl->getClassInterface());
201 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope);
202 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope);
204 // Introduce all of the other parameters into this scope.
205 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(),
206 E = MDecl->param_end(); PI != E; ++PI) {
207 ParmVarDecl *Param = (*PI);
208 if (!Param->isInvalidDecl() &&
209 RequireCompleteType(Param->getLocation(), Param->getType(),
210 diag::err_typecheck_decl_incomplete_type))
211 Param->setInvalidDecl();
212 if ((*PI)->getIdentifier())
213 PushOnScopeChains(*PI, FnBodyScope);
215 // Warn on implementating deprecated methods under
216 // -Wdeprecated-implementations flag.
217 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface())
218 if (ObjCMethodDecl *IMD =
219 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod()))
220 DiagnoseObjCImplementedDeprecations(*this,
221 dyn_cast<NamedDecl>(IMD),
222 MDecl->getLocation(), 0);
226 ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
227 IdentifierInfo *ClassName, SourceLocation ClassLoc,
228 IdentifierInfo *SuperName, SourceLocation SuperLoc,
229 Decl * const *ProtoRefs, unsigned NumProtoRefs,
230 const SourceLocation *ProtoLocs,
231 SourceLocation EndProtoLoc, AttributeList *AttrList) {
232 assert(ClassName && "Missing class identifier");
234 // Check for another declaration kind with the same name.
235 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc,
236 LookupOrdinaryName, ForRedeclaration);
238 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
239 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
240 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
243 ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
245 // Class already seen. Is it a forward declaration?
246 if (!IDecl->isForwardDecl()) {
247 IDecl->setInvalidDecl();
248 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName();
249 Diag(IDecl->getLocation(), diag::note_previous_definition);
251 // Return the previous class interface.
252 // FIXME: don't leak the objects passed in!
255 IDecl->setLocation(AtInterfaceLoc);
256 IDecl->setForwardDecl(false);
257 IDecl->setClassLoc(ClassLoc);
258 // If the forward decl was in a PCH, we need to write it again in a
259 // dependent AST file.
260 IDecl->setChangedSinceDeserialization(true);
262 // Since this ObjCInterfaceDecl was created by a forward declaration,
263 // we now add it to the DeclContext since it wasn't added before
264 // (see ActOnForwardClassDeclaration).
265 IDecl->setLexicalDeclContext(CurContext);
266 CurContext->addDecl(IDecl);
269 ProcessDeclAttributeList(TUScope, IDecl, AttrList);
272 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc,
273 ClassName, ClassLoc);
275 ProcessDeclAttributeList(TUScope, IDecl, AttrList);
277 PushOnScopeChains(IDecl, TUScope);
281 // Check if a different kind of symbol declared in this scope.
282 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc,
286 // Try to correct for a typo in the superclass name.
287 LookupResult R(*this, SuperName, SuperLoc, LookupOrdinaryName);
288 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) &&
289 (PrevDecl = R.getAsSingle<ObjCInterfaceDecl>())) {
290 Diag(SuperLoc, diag::err_undef_superclass_suggest)
291 << SuperName << ClassName << PrevDecl->getDeclName();
292 Diag(PrevDecl->getLocation(), diag::note_previous_decl)
293 << PrevDecl->getDeclName();
297 if (PrevDecl == IDecl) {
298 Diag(SuperLoc, diag::err_recursive_superclass)
299 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
300 IDecl->setLocEnd(ClassLoc);
302 ObjCInterfaceDecl *SuperClassDecl =
303 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
305 // Diagnose classes that inherit from deprecated classes.
307 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc);
309 if (PrevDecl && SuperClassDecl == 0) {
310 // The previous declaration was not a class decl. Check if we have a
311 // typedef. If we do, get the underlying class type.
312 if (const TypedefNameDecl *TDecl =
313 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
314 QualType T = TDecl->getUnderlyingType();
315 if (T->isObjCObjectType()) {
316 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface())
317 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl);
321 // This handles the following case:
323 // typedef int SuperClass;
324 // @interface MyClass : SuperClass {} @end
326 if (!SuperClassDecl) {
327 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName;
328 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
332 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
334 Diag(SuperLoc, diag::err_undef_superclass)
335 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
336 else if (SuperClassDecl->isForwardDecl())
337 Diag(SuperLoc, diag::err_undef_superclass)
338 << SuperClassDecl->getDeclName() << ClassName
339 << SourceRange(AtInterfaceLoc, ClassLoc);
341 IDecl->setSuperClass(SuperClassDecl);
342 IDecl->setSuperClassLoc(SuperLoc);
343 IDecl->setLocEnd(SuperLoc);
345 } else { // we have a root class.
346 IDecl->setLocEnd(ClassLoc);
349 // Check then save referenced protocols.
351 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
353 IDecl->setLocEnd(EndProtoLoc);
356 CheckObjCDeclScope(IDecl);
360 /// ActOnCompatiblityAlias - this action is called after complete parsing of
361 /// @compatibility_alias declaration. It sets up the alias relationships.
362 Decl *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc,
363 IdentifierInfo *AliasName,
364 SourceLocation AliasLocation,
365 IdentifierInfo *ClassName,
366 SourceLocation ClassLocation) {
367 // Look for previous declaration of alias name
368 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation,
369 LookupOrdinaryName, ForRedeclaration);
371 if (isa<ObjCCompatibleAliasDecl>(ADecl))
372 Diag(AliasLocation, diag::warn_previous_alias_decl);
374 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName;
375 Diag(ADecl->getLocation(), diag::note_previous_declaration);
378 // Check for class declaration
379 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
380 LookupOrdinaryName, ForRedeclaration);
381 if (const TypedefNameDecl *TDecl =
382 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) {
383 QualType T = TDecl->getUnderlyingType();
384 if (T->isObjCObjectType()) {
385 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) {
386 ClassName = IDecl->getIdentifier();
387 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
388 LookupOrdinaryName, ForRedeclaration);
392 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU);
394 Diag(ClassLocation, diag::warn_undef_interface) << ClassName;
396 Diag(CDeclU->getLocation(), diag::note_previous_declaration);
400 // Everything checked out, instantiate a new alias declaration AST.
401 ObjCCompatibleAliasDecl *AliasDecl =
402 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl);
404 if (!CheckObjCDeclScope(AliasDecl))
405 PushOnScopeChains(AliasDecl, TUScope);
410 bool Sema::CheckForwardProtocolDeclarationForCircularDependency(
411 IdentifierInfo *PName,
412 SourceLocation &Ploc, SourceLocation PrevLoc,
413 const ObjCList<ObjCProtocolDecl> &PList) {
416 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(),
417 E = PList.end(); I != E; ++I) {
418 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(),
420 if (PDecl->getIdentifier() == PName) {
421 Diag(Ploc, diag::err_protocol_has_circular_dependency);
422 Diag(PrevLoc, diag::note_previous_definition);
425 if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc,
426 PDecl->getLocation(), PDecl->getReferencedProtocols()))
434 Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc,
435 IdentifierInfo *ProtocolName,
436 SourceLocation ProtocolLoc,
437 Decl * const *ProtoRefs,
438 unsigned NumProtoRefs,
439 const SourceLocation *ProtoLocs,
440 SourceLocation EndProtoLoc,
441 AttributeList *AttrList) {
443 // FIXME: Deal with AttrList.
444 assert(ProtocolName && "Missing protocol identifier");
445 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName, ProtocolLoc);
447 // Protocol already seen. Better be a forward protocol declaration
448 if (!PDecl->isForwardDecl()) {
449 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName;
450 Diag(PDecl->getLocation(), diag::note_previous_definition);
451 // Just return the protocol we already had.
452 // FIXME: don't leak the objects passed in!
455 ObjCList<ObjCProtocolDecl> PList;
456 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context);
457 err = CheckForwardProtocolDeclarationForCircularDependency(
458 ProtocolName, ProtocolLoc, PDecl->getLocation(), PList);
460 // Make sure the cached decl gets a valid start location.
461 PDecl->setLocation(AtProtoInterfaceLoc);
462 PDecl->setForwardDecl(false);
463 CurContext->addDecl(PDecl);
464 // Repeat in dependent AST files.
465 PDecl->setChangedSinceDeserialization(true);
467 PDecl = ObjCProtocolDecl::Create(Context, CurContext,
468 AtProtoInterfaceLoc,ProtocolName);
469 PushOnScopeChains(PDecl, TUScope);
470 PDecl->setForwardDecl(false);
473 ProcessDeclAttributeList(TUScope, PDecl, AttrList);
474 if (!err && NumProtoRefs ) {
475 /// Check then save referenced protocols.
476 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
478 PDecl->setLocEnd(EndProtoLoc);
481 CheckObjCDeclScope(PDecl);
485 /// FindProtocolDeclaration - This routine looks up protocols and
486 /// issues an error if they are not declared. It returns list of
487 /// protocol declarations in its 'Protocols' argument.
489 Sema::FindProtocolDeclaration(bool WarnOnDeclarations,
490 const IdentifierLocPair *ProtocolId,
491 unsigned NumProtocols,
492 llvm::SmallVectorImpl<Decl *> &Protocols) {
493 for (unsigned i = 0; i != NumProtocols; ++i) {
494 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first,
495 ProtocolId[i].second);
497 LookupResult R(*this, ProtocolId[i].first, ProtocolId[i].second,
498 LookupObjCProtocolName);
499 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) &&
500 (PDecl = R.getAsSingle<ObjCProtocolDecl>())) {
501 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest)
502 << ProtocolId[i].first << R.getLookupName();
503 Diag(PDecl->getLocation(), diag::note_previous_decl)
504 << PDecl->getDeclName();
509 Diag(ProtocolId[i].second, diag::err_undeclared_protocol)
510 << ProtocolId[i].first;
514 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second);
516 // If this is a forward declaration and we are supposed to warn in this
518 if (WarnOnDeclarations && PDecl->isForwardDecl())
519 Diag(ProtocolId[i].second, diag::warn_undef_protocolref)
520 << ProtocolId[i].first;
521 Protocols.push_back(PDecl);
525 /// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of
526 /// a class method in its extension.
528 void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
529 ObjCInterfaceDecl *ID) {
531 return; // Possibly due to previous error
533 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap;
534 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(),
535 e = ID->meth_end(); i != e; ++i) {
536 ObjCMethodDecl *MD = *i;
537 MethodMap[MD->getSelector()] = MD;
540 if (MethodMap.empty())
542 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(),
543 e = CAT->meth_end(); i != e; ++i) {
544 ObjCMethodDecl *Method = *i;
545 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()];
546 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) {
547 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
548 << Method->getDeclName();
549 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
554 /// ActOnForwardProtocolDeclaration - Handle @protocol foo;
556 Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc,
557 const IdentifierLocPair *IdentList,
559 AttributeList *attrList) {
560 llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols;
561 llvm::SmallVector<SourceLocation, 8> ProtoLocs;
563 for (unsigned i = 0; i != NumElts; ++i) {
564 IdentifierInfo *Ident = IdentList[i].first;
565 ObjCProtocolDecl *PDecl = LookupProtocol(Ident, IdentList[i].second);
567 if (PDecl == 0) { // Not already seen?
568 PDecl = ObjCProtocolDecl::Create(Context, CurContext,
569 IdentList[i].second, Ident);
570 PushOnScopeChains(PDecl, TUScope, false);
574 ProcessDeclAttributeList(TUScope, PDecl, attrList);
576 PDecl->setChangedSinceDeserialization(true);
578 Protocols.push_back(PDecl);
579 ProtoLocs.push_back(IdentList[i].second);
582 ObjCForwardProtocolDecl *PDecl =
583 ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc,
584 Protocols.data(), Protocols.size(),
586 CurContext->addDecl(PDecl);
587 CheckObjCDeclScope(PDecl);
592 ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
593 IdentifierInfo *ClassName, SourceLocation ClassLoc,
594 IdentifierInfo *CategoryName,
595 SourceLocation CategoryLoc,
596 Decl * const *ProtoRefs,
597 unsigned NumProtoRefs,
598 const SourceLocation *ProtoLocs,
599 SourceLocation EndProtoLoc) {
600 ObjCCategoryDecl *CDecl;
601 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
603 /// Check that class of this category is already completely declared.
604 if (!IDecl || IDecl->isForwardDecl()) {
605 // Create an invalid ObjCCategoryDecl to serve as context for
606 // the enclosing method declarations. We mark the decl invalid
607 // to make it clear that this isn't a valid AST.
608 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
609 ClassLoc, CategoryLoc, CategoryName);
610 CDecl->setInvalidDecl();
611 Diag(ClassLoc, diag::err_undef_interface) << ClassName;
615 if (!CategoryName && IDecl->getImplementation()) {
616 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName;
617 Diag(IDecl->getImplementation()->getLocation(),
618 diag::note_implementation_declared);
621 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
622 ClassLoc, CategoryLoc, CategoryName);
623 // FIXME: PushOnScopeChains?
624 CurContext->addDecl(CDecl);
626 CDecl->setClassInterface(IDecl);
627 // Insert class extension to the list of class's categories.
629 CDecl->insertNextClassCategory();
631 // If the interface is deprecated, warn about it.
632 (void)DiagnoseUseOfDecl(IDecl, ClassLoc);
635 /// Check for duplicate interface declaration for this category
636 ObjCCategoryDecl *CDeclChain;
637 for (CDeclChain = IDecl->getCategoryList(); CDeclChain;
638 CDeclChain = CDeclChain->getNextClassCategory()) {
639 if (CDeclChain->getIdentifier() == CategoryName) {
640 // Class extensions can be declared multiple times.
641 Diag(CategoryLoc, diag::warn_dup_category_def)
642 << ClassName << CategoryName;
643 Diag(CDeclChain->getLocation(), diag::note_previous_definition);
648 CDecl->insertNextClassCategory();
652 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
654 // Protocols in the class extension belong to the class.
655 if (CDecl->IsClassExtension())
656 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs,
657 NumProtoRefs, Context);
660 CheckObjCDeclScope(CDecl);
664 /// ActOnStartCategoryImplementation - Perform semantic checks on the
665 /// category implementation declaration and build an ObjCCategoryImplDecl
667 Decl *Sema::ActOnStartCategoryImplementation(
668 SourceLocation AtCatImplLoc,
669 IdentifierInfo *ClassName, SourceLocation ClassLoc,
670 IdentifierInfo *CatName, SourceLocation CatLoc) {
671 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
672 ObjCCategoryDecl *CatIDecl = 0;
674 CatIDecl = IDecl->FindCategoryDeclaration(CatName);
676 // Category @implementation with no corresponding @interface.
677 // Create and install one.
678 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, SourceLocation(),
679 SourceLocation(), SourceLocation(),
681 CatIDecl->setClassInterface(IDecl);
682 CatIDecl->insertNextClassCategory();
686 ObjCCategoryImplDecl *CDecl =
687 ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName,
689 /// Check that class of this category is already completely declared.
690 if (!IDecl || IDecl->isForwardDecl())
691 Diag(ClassLoc, diag::err_undef_interface) << ClassName;
693 // FIXME: PushOnScopeChains?
694 CurContext->addDecl(CDecl);
696 /// Check that CatName, category name, is not used in another implementation.
698 if (CatIDecl->getImplementation()) {
699 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName
701 Diag(CatIDecl->getImplementation()->getLocation(),
702 diag::note_previous_definition);
704 CatIDecl->setImplementation(CDecl);
705 // Warn on implementating category of deprecated class under
706 // -Wdeprecated-implementations flag.
707 DiagnoseObjCImplementedDeprecations(*this,
708 dyn_cast<NamedDecl>(IDecl),
709 CDecl->getLocation(), 2);
713 CheckObjCDeclScope(CDecl);
717 Decl *Sema::ActOnStartClassImplementation(
718 SourceLocation AtClassImplLoc,
719 IdentifierInfo *ClassName, SourceLocation ClassLoc,
720 IdentifierInfo *SuperClassname,
721 SourceLocation SuperClassLoc) {
722 ObjCInterfaceDecl* IDecl = 0;
723 // Check for another declaration kind with the same name.
725 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName,
727 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
728 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
729 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
730 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) {
731 // If this is a forward declaration of an interface, warn.
732 if (IDecl->isForwardDecl()) {
733 Diag(ClassLoc, diag::warn_undef_interface) << ClassName;
737 // We did not find anything with the name ClassName; try to correct for
738 // typos in the class name.
739 LookupResult R(*this, ClassName, ClassLoc, LookupOrdinaryName);
740 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) &&
741 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) {
742 // Suggest the (potentially) correct interface name. However, put the
743 // fix-it hint itself in a separate note, since changing the name in
744 // the warning would make the fix-it change semantics.However, don't
745 // provide a code-modification hint or use the typo name for recovery,
746 // because this is just a warning. The program may actually be correct.
747 Diag(ClassLoc, diag::warn_undef_interface_suggest)
748 << ClassName << R.getLookupName();
749 Diag(IDecl->getLocation(), diag::note_previous_decl)
751 << FixItHint::CreateReplacement(ClassLoc,
752 R.getLookupName().getAsString());
755 Diag(ClassLoc, diag::warn_undef_interface) << ClassName;
759 // Check that super class name is valid class name
760 ObjCInterfaceDecl* SDecl = 0;
761 if (SuperClassname) {
762 // Check if a different kind of symbol declared in this scope.
763 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc,
765 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
766 Diag(SuperClassLoc, diag::err_redefinition_different_kind)
768 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
770 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
772 Diag(SuperClassLoc, diag::err_undef_superclass)
773 << SuperClassname << ClassName;
774 else if (IDecl && IDecl->getSuperClass() != SDecl) {
775 // This implementation and its interface do not have the same
777 Diag(SuperClassLoc, diag::err_conflicting_super_class)
778 << SDecl->getDeclName();
779 Diag(SDecl->getLocation(), diag::note_previous_definition);
785 // Legacy case of @implementation with no corresponding @interface.
786 // Build, chain & install the interface decl into the identifier.
788 // FIXME: Do we support attributes on the @implementation? If so we should
790 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc,
791 ClassName, ClassLoc, false, true);
792 IDecl->setSuperClass(SDecl);
793 IDecl->setLocEnd(ClassLoc);
795 PushOnScopeChains(IDecl, TUScope);
797 // Mark the interface as being completed, even if it was just as
799 // declaration; the user cannot reopen it.
800 IDecl->setForwardDecl(false);
803 ObjCImplementationDecl* IMPDecl =
804 ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc,
807 if (CheckObjCDeclScope(IMPDecl))
810 // Check that there is no duplicate implementation of this class.
811 if (IDecl->getImplementation()) {
812 // FIXME: Don't leak everything!
813 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName;
814 Diag(IDecl->getImplementation()->getLocation(),
815 diag::note_previous_definition);
816 } else { // add it to the list.
817 IDecl->setImplementation(IMPDecl);
818 PushOnScopeChains(IMPDecl, TUScope);
819 // Warn on implementating deprecated class under
820 // -Wdeprecated-implementations flag.
821 DiagnoseObjCImplementedDeprecations(*this,
822 dyn_cast<NamedDecl>(IDecl),
823 IMPDecl->getLocation(), 1);
828 void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
829 ObjCIvarDecl **ivars, unsigned numIvars,
830 SourceLocation RBrace) {
831 assert(ImpDecl && "missing implementation decl");
832 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface();
835 /// Check case of non-existing @interface decl.
836 /// (legacy objective-c @implementation decl without an @interface decl).
837 /// Add implementations's ivar to the synthesize class's ivar list.
838 if (IDecl->isImplicitInterfaceDecl()) {
839 IDecl->setLocEnd(RBrace);
840 // Add ivar's to class's DeclContext.
841 for (unsigned i = 0, e = numIvars; i != e; ++i) {
842 ivars[i]->setLexicalDeclContext(ImpDecl);
843 IDecl->makeDeclVisibleInContext(ivars[i], false);
844 ImpDecl->addDecl(ivars[i]);
849 // If implementation has empty ivar list, just return.
853 assert(ivars && "missing @implementation ivars");
854 if (LangOpts.ObjCNonFragileABI2) {
855 if (ImpDecl->getSuperClass())
856 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use);
857 for (unsigned i = 0; i < numIvars; i++) {
858 ObjCIvarDecl* ImplIvar = ivars[i];
859 if (const ObjCIvarDecl *ClsIvar =
860 IDecl->getIvarDecl(ImplIvar->getIdentifier())) {
861 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration);
862 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
865 // Instance ivar to Implementation's DeclContext.
866 ImplIvar->setLexicalDeclContext(ImpDecl);
867 IDecl->makeDeclVisibleInContext(ImplIvar, false);
868 ImpDecl->addDecl(ImplIvar);
872 // Check interface's Ivar list against those in the implementation.
873 // names and types must match.
876 ObjCInterfaceDecl::ivar_iterator
877 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end();
878 for (; numIvars > 0 && IVI != IVE; ++IVI) {
879 ObjCIvarDecl* ImplIvar = ivars[j++];
880 ObjCIvarDecl* ClsIvar = *IVI;
881 assert (ImplIvar && "missing implementation ivar");
882 assert (ClsIvar && "missing class ivar");
884 // First, make sure the types match.
885 if (Context.getCanonicalType(ImplIvar->getType()) !=
886 Context.getCanonicalType(ClsIvar->getType())) {
887 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type)
888 << ImplIvar->getIdentifier()
889 << ImplIvar->getType() << ClsIvar->getType();
890 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
891 } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) {
892 Expr *ImplBitWidth = ImplIvar->getBitWidth();
893 Expr *ClsBitWidth = ClsIvar->getBitWidth();
894 if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() !=
895 ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) {
896 Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth)
897 << ImplIvar->getIdentifier();
898 Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition);
901 // Make sure the names are identical.
902 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) {
903 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name)
904 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier();
905 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
911 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count);
913 Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count);
916 void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method,
917 bool &IncompleteImpl, unsigned DiagID) {
918 if (!IncompleteImpl) {
919 Diag(ImpLoc, diag::warn_incomplete_impl);
920 IncompleteImpl = true;
922 if (DiagID == diag::warn_unimplemented_protocol_method)
923 Diag(ImpLoc, DiagID) << method->getDeclName();
925 Diag(method->getLocation(), DiagID) << method->getDeclName();
928 /// Determines if type B can be substituted for type A. Returns true if we can
929 /// guarantee that anything that the user will do to an object of type A can
930 /// also be done to an object of type B. This is trivially true if the two
931 /// types are the same, or if B is a subclass of A. It becomes more complex
932 /// in cases where protocols are involved.
934 /// Object types in Objective-C describe the minimum requirements for an
935 /// object, rather than providing a complete description of a type. For
936 /// example, if A is a subclass of B, then B* may refer to an instance of A.
937 /// The principle of substitutability means that we may use an instance of A
938 /// anywhere that we may use an instance of B - it will implement all of the
939 /// ivars of B and all of the methods of B.
941 /// This substitutability is important when type checking methods, because
942 /// the implementation may have stricter type definitions than the interface.
943 /// The interface specifies minimum requirements, but the implementation may
944 /// have more accurate ones. For example, a method may privately accept
945 /// instances of B, but only publish that it accepts instances of A. Any
946 /// object passed to it will be type checked against B, and so will implicitly
947 /// by a valid A*. Similarly, a method may return a subclass of the class that
948 /// it is declared as returning.
950 /// This is most important when considering subclassing. A method in a
951 /// subclass must accept any object as an argument that its superclass's
952 /// implementation accepts. It may, however, accept a more general type
953 /// without breaking substitutability (i.e. you can still use the subclass
954 /// anywhere that you can use the superclass, but not vice versa). The
955 /// converse requirement applies to return types: the return type for a
956 /// subclass method must be a valid object of the kind that the superclass
957 /// advertises, but it may be specified more accurately. This avoids the need
958 /// for explicit down-casting by callers.
960 /// Note: This is a stricter requirement than for assignment.
961 static bool isObjCTypeSubstitutable(ASTContext &Context,
962 const ObjCObjectPointerType *A,
963 const ObjCObjectPointerType *B,
965 // Reject a protocol-unqualified id.
966 if (rejectId && B->isObjCIdType()) return false;
968 // If B is a qualified id, then A must also be a qualified id and it must
969 // implement all of the protocols in B. It may not be a qualified class.
970 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a
971 // stricter definition so it is not substitutable for id<A>.
972 if (B->isObjCQualifiedIdType()) {
973 return A->isObjCQualifiedIdType() &&
974 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0),
980 // id is a special type that bypasses type checking completely. We want a
981 // warning when it is used in one place but not another.
982 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false;
985 // If B is a qualified id, then A must also be a qualified id (which it isn't
986 // if we've got this far)
987 if (B->isObjCQualifiedIdType()) return false;
990 // Now we know that A and B are (potentially-qualified) class types. The
991 // normal rules for assignment apply.
992 return Context.canAssignObjCInterfaces(A, B);
995 static SourceRange getTypeRange(TypeSourceInfo *TSI) {
996 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange());
999 static void CheckMethodOverrideReturn(Sema &S,
1000 ObjCMethodDecl *MethodImpl,
1001 ObjCMethodDecl *MethodDecl,
1002 bool IsProtocolMethodDecl) {
1003 if (IsProtocolMethodDecl &&
1004 (MethodDecl->getObjCDeclQualifier() !=
1005 MethodImpl->getObjCDeclQualifier())) {
1006 S.Diag(MethodImpl->getLocation(),
1007 diag::warn_conflicting_ret_type_modifiers)
1008 << MethodImpl->getDeclName()
1009 << getTypeRange(MethodImpl->getResultTypeSourceInfo());
1010 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration)
1011 << getTypeRange(MethodDecl->getResultTypeSourceInfo());
1014 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(),
1015 MethodDecl->getResultType()))
1018 unsigned DiagID = diag::warn_conflicting_ret_types;
1020 // Mismatches between ObjC pointers go into a different warning
1021 // category, and sometimes they're even completely whitelisted.
1022 if (const ObjCObjectPointerType *ImplPtrTy =
1023 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) {
1024 if (const ObjCObjectPointerType *IfacePtrTy =
1025 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) {
1026 // Allow non-matching return types as long as they don't violate
1027 // the principle of substitutability. Specifically, we permit
1028 // return types that are subclasses of the declared return type,
1029 // or that are more-qualified versions of the declared type.
1030 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false))
1033 DiagID = diag::warn_non_covariant_ret_types;
1037 S.Diag(MethodImpl->getLocation(), DiagID)
1038 << MethodImpl->getDeclName()
1039 << MethodDecl->getResultType()
1040 << MethodImpl->getResultType()
1041 << getTypeRange(MethodImpl->getResultTypeSourceInfo());
1042 S.Diag(MethodDecl->getLocation(), diag::note_previous_definition)
1043 << getTypeRange(MethodDecl->getResultTypeSourceInfo());
1046 static void CheckMethodOverrideParam(Sema &S,
1047 ObjCMethodDecl *MethodImpl,
1048 ObjCMethodDecl *MethodDecl,
1049 ParmVarDecl *ImplVar,
1050 ParmVarDecl *IfaceVar,
1051 bool IsProtocolMethodDecl) {
1052 if (IsProtocolMethodDecl &&
1053 (ImplVar->getObjCDeclQualifier() !=
1054 IfaceVar->getObjCDeclQualifier())) {
1055 S.Diag(ImplVar->getLocation(),
1056 diag::warn_conflicting_param_modifiers)
1057 << getTypeRange(ImplVar->getTypeSourceInfo())
1058 << MethodImpl->getDeclName();
1059 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration)
1060 << getTypeRange(IfaceVar->getTypeSourceInfo());
1063 QualType ImplTy = ImplVar->getType();
1064 QualType IfaceTy = IfaceVar->getType();
1066 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy))
1069 unsigned DiagID = diag::warn_conflicting_param_types;
1071 // Mismatches between ObjC pointers go into a different warning
1072 // category, and sometimes they're even completely whitelisted.
1073 if (const ObjCObjectPointerType *ImplPtrTy =
1074 ImplTy->getAs<ObjCObjectPointerType>()) {
1075 if (const ObjCObjectPointerType *IfacePtrTy =
1076 IfaceTy->getAs<ObjCObjectPointerType>()) {
1077 // Allow non-matching argument types as long as they don't
1078 // violate the principle of substitutability. Specifically, the
1079 // implementation must accept any objects that the superclass
1080 // accepts, however it may also accept others.
1081 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true))
1084 DiagID = diag::warn_non_contravariant_param_types;
1088 S.Diag(ImplVar->getLocation(), DiagID)
1089 << getTypeRange(ImplVar->getTypeSourceInfo())
1090 << MethodImpl->getDeclName() << IfaceTy << ImplTy;
1091 S.Diag(IfaceVar->getLocation(), diag::note_previous_definition)
1092 << getTypeRange(IfaceVar->getTypeSourceInfo());
1096 void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl,
1097 ObjCMethodDecl *MethodDecl,
1098 bool IsProtocolMethodDecl) {
1099 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl,
1100 IsProtocolMethodDecl);
1102 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(),
1103 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end();
1104 IM != EM; ++IM, ++IF)
1105 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF,
1106 IsProtocolMethodDecl);
1108 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) {
1109 Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_variadic);
1110 Diag(MethodDecl->getLocation(), diag::note_previous_declaration);
1114 /// FIXME: Type hierarchies in Objective-C can be deep. We could most likely
1115 /// improve the efficiency of selector lookups and type checking by associating
1116 /// with each protocol / interface / category the flattened instance tables. If
1117 /// we used an immutable set to keep the table then it wouldn't add significant
1118 /// memory cost and it would be handy for lookups.
1120 /// CheckProtocolMethodDefs - This routine checks unimplemented methods
1121 /// Declared in protocol, and those referenced by it.
1122 void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc,
1123 ObjCProtocolDecl *PDecl,
1124 bool& IncompleteImpl,
1125 const llvm::DenseSet<Selector> &InsMap,
1126 const llvm::DenseSet<Selector> &ClsMap,
1127 ObjCContainerDecl *CDecl) {
1128 ObjCInterfaceDecl *IDecl;
1129 if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl))
1130 IDecl = C->getClassInterface();
1132 IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl);
1133 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null");
1135 ObjCInterfaceDecl *Super = IDecl->getSuperClass();
1136 ObjCInterfaceDecl *NSIDecl = 0;
1137 if (getLangOptions().NeXTRuntime) {
1138 // check to see if class implements forwardInvocation method and objects
1139 // of this class are derived from 'NSProxy' so that to forward requests
1140 // from one object to another.
1141 // Under such conditions, which means that every method possible is
1142 // implemented in the class, we should not issue "Method definition not
1144 // FIXME: Use a general GetUnarySelector method for this.
1145 IdentifierInfo* II = &Context.Idents.get("forwardInvocation");
1146 Selector fISelector = Context.Selectors.getSelector(1, &II);
1147 if (InsMap.count(fISelector))
1148 // Is IDecl derived from 'NSProxy'? If so, no instance methods
1149 // need be implemented in the implementation.
1150 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy"));
1153 // If a method lookup fails locally we still need to look and see if
1154 // the method was implemented by a base class or an inherited
1155 // protocol. This lookup is slow, but occurs rarely in correct code
1156 // and otherwise would terminate in a warning.
1158 // check unimplemented instance methods.
1160 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
1161 E = PDecl->instmeth_end(); I != E; ++I) {
1162 ObjCMethodDecl *method = *I;
1163 if (method->getImplementationControl() != ObjCMethodDecl::Optional &&
1164 !method->isSynthesized() && !InsMap.count(method->getSelector()) &&
1166 !Super->lookupInstanceMethod(method->getSelector()))) {
1167 // Ugly, but necessary. Method declared in protcol might have
1168 // have been synthesized due to a property declared in the class which
1169 // uses the protocol.
1170 ObjCMethodDecl *MethodInClass =
1171 IDecl->lookupInstanceMethod(method->getSelector());
1172 if (!MethodInClass || !MethodInClass->isSynthesized()) {
1173 unsigned DIAG = diag::warn_unimplemented_protocol_method;
1174 if (Diags.getDiagnosticLevel(DIAG, ImpLoc)
1175 != Diagnostic::Ignored) {
1176 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG);
1177 Diag(method->getLocation(), diag::note_method_declared_at);
1178 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at)
1179 << PDecl->getDeclName();
1184 // check unimplemented class methods
1185 for (ObjCProtocolDecl::classmeth_iterator
1186 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
1188 ObjCMethodDecl *method = *I;
1189 if (method->getImplementationControl() != ObjCMethodDecl::Optional &&
1190 !ClsMap.count(method->getSelector()) &&
1191 (!Super || !Super->lookupClassMethod(method->getSelector()))) {
1192 unsigned DIAG = diag::warn_unimplemented_protocol_method;
1193 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != Diagnostic::Ignored) {
1194 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG);
1195 Diag(method->getLocation(), diag::note_method_declared_at);
1196 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) <<
1197 PDecl->getDeclName();
1201 // Check on this protocols's referenced protocols, recursively.
1202 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
1203 E = PDecl->protocol_end(); PI != E; ++PI)
1204 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl);
1207 /// MatchAllMethodDeclarations - Check methods declaraed in interface or
1208 /// or protocol against those declared in their implementations.
1210 void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap,
1211 const llvm::DenseSet<Selector> &ClsMap,
1212 llvm::DenseSet<Selector> &InsMapSeen,
1213 llvm::DenseSet<Selector> &ClsMapSeen,
1214 ObjCImplDecl* IMPDecl,
1215 ObjCContainerDecl* CDecl,
1216 bool &IncompleteImpl,
1217 bool ImmediateClass) {
1218 // Check and see if instance methods in class interface have been
1219 // implemented in the implementation class. If so, their types match.
1220 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(),
1221 E = CDecl->instmeth_end(); I != E; ++I) {
1222 if (InsMapSeen.count((*I)->getSelector()))
1224 InsMapSeen.insert((*I)->getSelector());
1225 if (!(*I)->isSynthesized() &&
1226 !InsMap.count((*I)->getSelector())) {
1228 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl,
1229 diag::note_undef_method_impl);
1232 ObjCMethodDecl *ImpMethodDecl =
1233 IMPDecl->getInstanceMethod((*I)->getSelector());
1234 ObjCMethodDecl *MethodDecl =
1235 CDecl->getInstanceMethod((*I)->getSelector());
1236 assert(MethodDecl &&
1237 "MethodDecl is null in ImplMethodsVsClassMethods");
1238 // ImpMethodDecl may be null as in a @dynamic property.
1240 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl,
1241 isa<ObjCProtocolDecl>(CDecl));
1245 // Check and see if class methods in class interface have been
1246 // implemented in the implementation class. If so, their types match.
1247 for (ObjCInterfaceDecl::classmeth_iterator
1248 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) {
1249 if (ClsMapSeen.count((*I)->getSelector()))
1251 ClsMapSeen.insert((*I)->getSelector());
1252 if (!ClsMap.count((*I)->getSelector())) {
1254 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl,
1255 diag::note_undef_method_impl);
1257 ObjCMethodDecl *ImpMethodDecl =
1258 IMPDecl->getClassMethod((*I)->getSelector());
1259 ObjCMethodDecl *MethodDecl =
1260 CDecl->getClassMethod((*I)->getSelector());
1261 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl,
1262 isa<ObjCProtocolDecl>(CDecl));
1266 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) {
1267 // Also methods in class extensions need be looked at next.
1268 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension();
1269 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension())
1270 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1272 const_cast<ObjCCategoryDecl *>(ClsExtDecl),
1273 IncompleteImpl, false);
1275 // Check for any implementation of a methods declared in protocol.
1276 for (ObjCInterfaceDecl::all_protocol_iterator
1277 PI = I->all_referenced_protocol_begin(),
1278 E = I->all_referenced_protocol_end(); PI != E; ++PI)
1279 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1281 (*PI), IncompleteImpl, false);
1282 if (I->getSuperClass())
1283 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1285 I->getSuperClass(), IncompleteImpl, false);
1289 void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
1290 ObjCContainerDecl* CDecl,
1291 bool IncompleteImpl) {
1292 llvm::DenseSet<Selector> InsMap;
1293 // Check and see if instance methods in class interface have been
1294 // implemented in the implementation class.
1295 for (ObjCImplementationDecl::instmeth_iterator
1296 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I)
1297 InsMap.insert((*I)->getSelector());
1299 // Check and see if properties declared in the interface have either 1)
1300 // an implementation or 2) there is a @synthesize/@dynamic implementation
1301 // of the property in the @implementation.
1302 if (isa<ObjCInterfaceDecl>(CDecl) &&
1303 !(LangOpts.ObjCDefaultSynthProperties && LangOpts.ObjCNonFragileABI2))
1304 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);
1306 llvm::DenseSet<Selector> ClsMap;
1307 for (ObjCImplementationDecl::classmeth_iterator
1308 I = IMPDecl->classmeth_begin(),
1309 E = IMPDecl->classmeth_end(); I != E; ++I)
1310 ClsMap.insert((*I)->getSelector());
1312 // Check for type conflict of methods declared in a class/protocol and
1313 // its implementation; if any.
1314 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen;
1315 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1317 IncompleteImpl, true);
1319 // Check the protocol list for unimplemented methods in the @implementation
1321 // Check and see if class methods in class interface have been
1322 // implemented in the implementation class.
1324 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) {
1325 for (ObjCInterfaceDecl::all_protocol_iterator
1326 PI = I->all_referenced_protocol_begin(),
1327 E = I->all_referenced_protocol_end(); PI != E; ++PI)
1328 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl,
1330 // Check class extensions (unnamed categories)
1331 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension();
1332 Categories; Categories = Categories->getNextClassExtension())
1333 ImplMethodsVsClassMethods(S, IMPDecl,
1334 const_cast<ObjCCategoryDecl*>(Categories),
1336 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) {
1337 // For extended class, unimplemented methods in its protocols will
1338 // be reported in the primary class.
1339 if (!C->IsClassExtension()) {
1340 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(),
1341 E = C->protocol_end(); PI != E; ++PI)
1342 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl,
1343 InsMap, ClsMap, CDecl);
1344 // Report unimplemented properties in the category as well.
1345 // When reporting on missing setter/getters, do not report when
1346 // setter/getter is implemented in category's primary class
1348 if (ObjCInterfaceDecl *ID = C->getClassInterface())
1349 if (ObjCImplDecl *IMP = ID->getImplementation()) {
1350 for (ObjCImplementationDecl::instmeth_iterator
1351 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I)
1352 InsMap.insert((*I)->getSelector());
1354 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);
1357 assert(false && "invalid ObjCContainerDecl type.");
1360 /// ActOnForwardClassDeclaration -
1362 Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc,
1363 IdentifierInfo **IdentList,
1364 SourceLocation *IdentLocs,
1366 llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces;
1368 for (unsigned i = 0; i != NumElts; ++i) {
1369 // Check for another declaration kind with the same name.
1371 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i],
1372 LookupOrdinaryName, ForRedeclaration);
1373 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1374 // Maybe we will complain about the shadowed template parameter.
1375 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl);
1376 // Just pretend that we didn't see the previous declaration.
1380 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
1381 // GCC apparently allows the following idiom:
1383 // typedef NSObject < XCElementTogglerP > XCElementToggler;
1384 // @class XCElementToggler;
1386 // FIXME: Make an extension?
1387 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl);
1388 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) {
1389 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i];
1390 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1392 // a forward class declaration matching a typedef name of a class refers
1393 // to the underlying class.
1394 if (const ObjCObjectType *OI =
1395 TDD->getUnderlyingType()->getAs<ObjCObjectType>())
1396 PrevDecl = OI->getInterface();
1399 ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
1400 if (!IDecl) { // Not already seen? Make a forward decl.
1401 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc,
1402 IdentList[i], IdentLocs[i], true);
1404 // Push the ObjCInterfaceDecl on the scope chain but do *not* add it to
1405 // the current DeclContext. This prevents clients that walk DeclContext
1406 // from seeing the imaginary ObjCInterfaceDecl until it is actually
1407 // declared later (if at all). We also take care to explicitly make
1408 // sure this declaration is visible for name lookup.
1409 PushOnScopeChains(IDecl, TUScope, false);
1410 CurContext->makeDeclVisibleInContext(IDecl, true);
1413 Interfaces.push_back(IDecl);
1416 assert(Interfaces.size() == NumElts);
1417 ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc,
1418 Interfaces.data(), IdentLocs,
1420 CurContext->addDecl(CDecl);
1421 CheckObjCDeclScope(CDecl);
1426 /// MatchTwoMethodDeclarations - Checks that two methods have matching type and
1427 /// returns true, or false, accordingly.
1428 /// TODO: Handle protocol list; such as id<p1,p2> in type comparisons
1429 bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
1430 const ObjCMethodDecl *PrevMethod,
1431 bool matchBasedOnSizeAndAlignment,
1432 bool matchBasedOnStrictEqulity) {
1433 QualType T1 = Context.getCanonicalType(Method->getResultType());
1434 QualType T2 = Context.getCanonicalType(PrevMethod->getResultType());
1437 // The result types are different.
1438 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity)
1440 // Incomplete types don't have a size and alignment.
1441 if (T1->isIncompleteType() || T2->isIncompleteType())
1443 // Check is based on size and alignment.
1444 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2))
1448 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(),
1449 E = Method->param_end();
1450 ObjCMethodDecl::param_iterator PrevI = PrevMethod->param_begin();
1452 for (; ParamI != E; ++ParamI, ++PrevI) {
1453 assert(PrevI != PrevMethod->param_end() && "Param mismatch");
1454 T1 = Context.getCanonicalType((*ParamI)->getType());
1455 T2 = Context.getCanonicalType((*PrevI)->getType());
1457 // The result types are different.
1458 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity)
1460 // Incomplete types don't have a size and alignment.
1461 if (T1->isIncompleteType() || T2->isIncompleteType())
1463 // Check is based on size and alignment.
1464 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2))
1471 /// \brief Read the contents of the method pool for a given selector from
1472 /// external storage.
1474 /// This routine should only be called once, when the method pool has no entry
1475 /// for this selector.
1476 Sema::GlobalMethodPool::iterator Sema::ReadMethodPool(Selector Sel) {
1477 assert(ExternalSource && "We need an external AST source");
1478 assert(MethodPool.find(Sel) == MethodPool.end() &&
1479 "Selector data already loaded into the method pool");
1481 // Read the method list from the external source.
1482 GlobalMethods Methods = ExternalSource->ReadMethodPool(Sel);
1484 return MethodPool.insert(std::make_pair(Sel, Methods)).first;
1487 void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl,
1489 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector());
1490 if (Pos == MethodPool.end()) {
1492 Pos = ReadMethodPool(Method->getSelector());
1494 Pos = MethodPool.insert(std::make_pair(Method->getSelector(),
1495 GlobalMethods())).first;
1497 Method->setDefined(impl);
1498 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second;
1499 if (Entry.Method == 0) {
1500 // Haven't seen a method with this selector name yet - add it.
1501 Entry.Method = Method;
1506 // We've seen a method with this name, see if we have already seen this type
1508 for (ObjCMethodList *List = &Entry; List; List = List->Next)
1509 if (MatchTwoMethodDeclarations(Method, List->Method)) {
1510 ObjCMethodDecl *PrevObjCMethod = List->Method;
1511 PrevObjCMethod->setDefined(impl);
1512 // If a method is deprecated, push it in the global pool.
1513 // This is used for better diagnostics.
1514 if (Method->isDeprecated()) {
1515 if (!PrevObjCMethod->isDeprecated())
1516 List->Method = Method;
1518 // If new method is unavailable, push it into global pool
1519 // unless previous one is deprecated.
1520 if (Method->isUnavailable()) {
1521 if (PrevObjCMethod->getAvailability() < AR_Deprecated)
1522 List->Method = Method;
1527 // We have a new signature for an existing method - add it.
1528 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
1529 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>();
1530 Entry.Next = new (Mem) ObjCMethodList(Method, Entry.Next);
1533 ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R,
1534 bool receiverIdOrClass,
1535 bool warn, bool instance) {
1536 GlobalMethodPool::iterator Pos = MethodPool.find(Sel);
1537 if (Pos == MethodPool.end()) {
1539 Pos = ReadMethodPool(Sel);
1544 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second;
1546 bool strictSelectorMatch = receiverIdOrClass && warn &&
1547 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl,
1549 Diagnostic::Ignored);
1550 if (warn && MethList.Method && MethList.Next) {
1551 bool issueWarning = false;
1552 if (strictSelectorMatch)
1553 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) {
1554 // This checks if the methods differ in type mismatch.
1555 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, false, true))
1556 issueWarning = true;
1560 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) {
1561 // This checks if the methods differ by size & alignment.
1562 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true))
1563 issueWarning = true;
1567 if (strictSelectorMatch)
1568 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R;
1570 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R;
1571 Diag(MethList.Method->getLocStart(), diag::note_using)
1572 << MethList.Method->getSourceRange();
1573 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next)
1574 Diag(Next->Method->getLocStart(), diag::note_also_found)
1575 << Next->Method->getSourceRange();
1578 return MethList.Method;
1581 ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) {
1582 GlobalMethodPool::iterator Pos = MethodPool.find(Sel);
1583 if (Pos == MethodPool.end())
1586 GlobalMethods &Methods = Pos->second;
1588 if (Methods.first.Method && Methods.first.Method->isDefined())
1589 return Methods.first.Method;
1590 if (Methods.second.Method && Methods.second.Method->isDefined())
1591 return Methods.second.Method;
1595 /// CompareMethodParamsInBaseAndSuper - This routine compares methods with
1596 /// identical selector names in current and its super classes and issues
1597 /// a warning if any of their argument types are incompatible.
1598 void Sema::CompareMethodParamsInBaseAndSuper(Decl *ClassDecl,
1599 ObjCMethodDecl *Method,
1601 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ClassDecl);
1602 if (ID == 0) return;
1604 while (ObjCInterfaceDecl *SD = ID->getSuperClass()) {
1605 ObjCMethodDecl *SuperMethodDecl =
1606 SD->lookupMethod(Method->getSelector(), IsInstance);
1607 if (SuperMethodDecl == 0) {
1611 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(),
1612 E = Method->param_end();
1613 ObjCMethodDecl::param_iterator PrevI = SuperMethodDecl->param_begin();
1614 for (; ParamI != E; ++ParamI, ++PrevI) {
1615 // Number of parameters are the same and is guaranteed by selector match.
1616 assert(PrevI != SuperMethodDecl->param_end() && "Param mismatch");
1617 QualType T1 = Context.getCanonicalType((*ParamI)->getType());
1618 QualType T2 = Context.getCanonicalType((*PrevI)->getType());
1619 // If type of argument of method in this class does not match its
1620 // respective argument type in the super class method, issue warning;
1621 if (!Context.typesAreCompatible(T1, T2)) {
1622 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super)
1624 Diag(SuperMethodDecl->getLocation(), diag::note_previous_declaration);
1632 /// DiagnoseDuplicateIvars -
1633 /// Check for duplicate ivars in the entire class at the start of
1634 /// @implementation. This becomes necesssary because class extension can
1635 /// add ivars to a class in random order which will not be known until
1636 /// class's @implementation is seen.
1637 void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID,
1638 ObjCInterfaceDecl *SID) {
1639 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(),
1640 IVE = ID->ivar_end(); IVI != IVE; ++IVI) {
1641 ObjCIvarDecl* Ivar = (*IVI);
1642 if (Ivar->isInvalidDecl())
1644 if (IdentifierInfo *II = Ivar->getIdentifier()) {
1645 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II);
1647 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II;
1648 Diag(prevIvar->getLocation(), diag::note_previous_declaration);
1649 Ivar->setInvalidDecl();
1655 // Note: For class/category implemenations, allMethods/allProperties is
1657 void Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd,
1659 Decl **allMethods, unsigned allNum,
1660 Decl **allProperties, unsigned pNum,
1661 DeclGroupPtrTy *allTUVars, unsigned tuvNum) {
1662 // FIXME: If we don't have a ClassDecl, we have an error. We should consider
1663 // always passing in a decl. If the decl has an error, isInvalidDecl()
1668 bool isInterfaceDeclKind =
1669 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl)
1670 || isa<ObjCProtocolDecl>(ClassDecl);
1671 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl);
1673 if (!isInterfaceDeclKind && AtEnd.isInvalid()) {
1674 // FIXME: This is wrong. We shouldn't be pretending that there is
1675 // an '@end' in the declaration.
1676 SourceLocation L = ClassDecl->getLocation();
1679 Diag(L, diag::err_missing_atend);
1682 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext.
1683 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap;
1684 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap;
1686 for (unsigned i = 0; i < allNum; i++ ) {
1687 ObjCMethodDecl *Method =
1688 cast_or_null<ObjCMethodDecl>(allMethods[i]);
1690 if (!Method) continue; // Already issued a diagnostic.
1691 if (Method->isInstanceMethod()) {
1692 /// Check for instance method of the same name with incompatible types
1693 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()];
1694 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
1696 if ((isInterfaceDeclKind && PrevMethod && !match)
1697 || (checkIdenticalMethods && match)) {
1698 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
1699 << Method->getDeclName();
1700 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
1701 Method->setInvalidDecl();
1703 InsMap[Method->getSelector()] = Method;
1704 /// The following allows us to typecheck messages to "id".
1705 AddInstanceMethodToGlobalPool(Method);
1706 // verify that the instance method conforms to the same definition of
1707 // parent methods if it shadows one.
1708 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, true);
1711 /// Check for class method of the same name with incompatible types
1712 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()];
1713 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
1715 if ((isInterfaceDeclKind && PrevMethod && !match)
1716 || (checkIdenticalMethods && match)) {
1717 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
1718 << Method->getDeclName();
1719 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
1720 Method->setInvalidDecl();
1722 ClsMap[Method->getSelector()] = Method;
1723 /// The following allows us to typecheck messages to "Class".
1724 AddFactoryMethodToGlobalPool(Method);
1725 // verify that the class method conforms to the same definition of
1726 // parent methods if it shadows one.
1727 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, false);
1731 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
1732 // Compares properties declared in this class to those of its
1734 ComparePropertiesInBaseAndSuper(I);
1735 CompareProperties(I, I);
1736 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
1737 // Categories are used to extend the class by declaring new methods.
1738 // By the same token, they are also used to add new properties. No
1739 // need to compare the added property to those in the class.
1741 // Compare protocol properties with those in category
1742 CompareProperties(C, C);
1743 if (C->IsClassExtension()) {
1744 ObjCInterfaceDecl *CCPrimary = C->getClassInterface();
1745 DiagnoseClassExtensionDupMethods(C, CCPrimary);
1748 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) {
1749 if (CDecl->getIdentifier())
1750 // ProcessPropertyDecl is responsible for diagnosing conflicts with any
1751 // user-defined setter/getter. It also synthesizes setter/getter methods
1752 // and adds them to the DeclContext and global method pools.
1753 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(),
1754 E = CDecl->prop_end();
1756 ProcessPropertyDecl(*I, CDecl);
1757 CDecl->setAtEndRange(AtEnd);
1759 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
1760 IC->setAtEndRange(AtEnd);
1761 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) {
1762 // Any property declared in a class extension might have user
1763 // declared setter or getter in current class extension or one
1764 // of the other class extensions. Mark them as synthesized as
1765 // property will be synthesized when property with same name is
1766 // seen in the @implementation.
1767 for (const ObjCCategoryDecl *ClsExtDecl =
1768 IDecl->getFirstClassExtension();
1769 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) {
1770 for (ObjCContainerDecl::prop_iterator I = ClsExtDecl->prop_begin(),
1771 E = ClsExtDecl->prop_end(); I != E; ++I) {
1772 ObjCPropertyDecl *Property = (*I);
1773 // Skip over properties declared @dynamic
1774 if (const ObjCPropertyImplDecl *PIDecl
1775 = IC->FindPropertyImplDecl(Property->getIdentifier()))
1776 if (PIDecl->getPropertyImplementation()
1777 == ObjCPropertyImplDecl::Dynamic)
1780 for (const ObjCCategoryDecl *CExtDecl =
1781 IDecl->getFirstClassExtension();
1782 CExtDecl; CExtDecl = CExtDecl->getNextClassExtension()) {
1783 if (ObjCMethodDecl *GetterMethod =
1784 CExtDecl->getInstanceMethod(Property->getGetterName()))
1785 GetterMethod->setSynthesized(true);
1786 if (!Property->isReadOnly())
1787 if (ObjCMethodDecl *SetterMethod =
1788 CExtDecl->getInstanceMethod(Property->getSetterName()))
1789 SetterMethod->setSynthesized(true);
1794 if (LangOpts.ObjCDefaultSynthProperties &&
1795 LangOpts.ObjCNonFragileABI2)
1796 DefaultSynthesizeProperties(S, IC, IDecl);
1797 ImplMethodsVsClassMethods(S, IC, IDecl);
1798 AtomicPropertySetterGetterRules(IC, IDecl);
1800 if (LangOpts.ObjCNonFragileABI2)
1801 while (IDecl->getSuperClass()) {
1802 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass());
1803 IDecl = IDecl->getSuperClass();
1806 SetIvarInitializers(IC);
1807 } else if (ObjCCategoryImplDecl* CatImplClass =
1808 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) {
1809 CatImplClass->setAtEndRange(AtEnd);
1811 // Find category interface decl and then check that all methods declared
1812 // in this interface are implemented in the category @implementation.
1813 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) {
1814 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList();
1815 Categories; Categories = Categories->getNextClassCategory()) {
1816 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) {
1817 ImplMethodsVsClassMethods(S, CatImplClass, Categories);
1823 if (isInterfaceDeclKind) {
1824 // Reject invalid vardecls.
1825 for (unsigned i = 0; i != tuvNum; i++) {
1826 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>();
1827 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
1828 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) {
1829 if (!VDecl->hasExternalStorage())
1830 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass);
1837 /// CvtQTToAstBitMask - utility routine to produce an AST bitmask for
1838 /// objective-c's type qualifier from the parser version of the same info.
1839 static Decl::ObjCDeclQualifier
1840 CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) {
1841 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal;
1845 bool containsInvalidMethodImplAttribute(const AttrVec &A) {
1846 // The 'ibaction' attribute is allowed on method definitions because of
1847 // how the IBAction macro is used on both method declarations and definitions.
1848 // If the method definitions contains any other attributes, return true.
1849 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i)
1850 if ((*i)->getKind() != attr::IBAction)
1855 /// \brief Check whether the declared result type of the given Objective-C
1856 /// method declaration is compatible with the method's class.
1859 CheckRelatedResultTypeCompatibility(Sema &S, ObjCMethodDecl *Method,
1860 ObjCInterfaceDecl *CurrentClass) {
1861 QualType ResultType = Method->getResultType();
1862 SourceRange ResultTypeRange;
1863 if (const TypeSourceInfo *ResultTypeInfo = Method->getResultTypeSourceInfo())
1864 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange();
1866 // If an Objective-C method inherits its related result type, then its
1867 // declared result type must be compatible with its own class type. The
1868 // declared result type is compatible if:
1869 if (const ObjCObjectPointerType *ResultObjectType
1870 = ResultType->getAs<ObjCObjectPointerType>()) {
1871 // - it is id or qualified id, or
1872 if (ResultObjectType->isObjCIdType() ||
1873 ResultObjectType->isObjCQualifiedIdType())
1877 if (ObjCInterfaceDecl *ResultClass
1878 = ResultObjectType->getInterfaceDecl()) {
1879 // - it is the same as the method's class type, or
1880 if (CurrentClass == ResultClass)
1883 // - it is a superclass of the method's class type
1884 if (ResultClass->isSuperClassOf(CurrentClass))
1893 /// \brief Determine if any method in the global method pool has an inferred
1896 anyMethodInfersRelatedResultType(Sema &S, Selector Sel, bool IsInstance) {
1897 Sema::GlobalMethodPool::iterator Pos = S.MethodPool.find(Sel);
1898 if (Pos == S.MethodPool.end()) {
1899 if (S.ExternalSource)
1900 Pos = S.ReadMethodPool(Sel);
1905 ObjCMethodList &List = IsInstance ? Pos->second.first : Pos->second.second;
1906 for (ObjCMethodList *M = &List; M; M = M->Next) {
1907 if (M->Method && M->Method->hasRelatedResultType())
1914 Decl *Sema::ActOnMethodDeclaration(
1916 SourceLocation MethodLoc, SourceLocation EndLoc,
1917 tok::TokenKind MethodType, Decl *ClassDecl,
1918 ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
1919 SourceLocation SelectorStartLoc,
1921 // optional arguments. The number of types/arguments is obtained
1922 // from the Sel.getNumArgs().
1923 ObjCArgInfo *ArgInfo,
1924 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args
1925 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind,
1926 bool isVariadic, bool MethodDefinition) {
1927 // Make sure we can establish a context for the method.
1929 Diag(MethodLoc, diag::error_missing_method_context);
1932 QualType resultDeclType;
1934 TypeSourceInfo *ResultTInfo = 0;
1936 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo);
1938 // Methods cannot return interface types. All ObjC objects are
1939 // passed by reference.
1940 if (resultDeclType->isObjCObjectType()) {
1941 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value)
1942 << 0 << resultDeclType;
1945 } else // get the type for "id".
1946 resultDeclType = Context.getObjCIdType();
1948 ObjCMethodDecl* ObjCMethod =
1949 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType,
1951 cast<DeclContext>(ClassDecl),
1952 MethodType == tok::minus, isVariadic,
1954 MethodDeclKind == tok::objc_optional
1955 ? ObjCMethodDecl::Optional
1956 : ObjCMethodDecl::Required,
1959 llvm::SmallVector<ParmVarDecl*, 16> Params;
1961 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) {
1965 if (ArgInfo[i].Type == 0) {
1966 ArgType = Context.getObjCIdType();
1969 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI);
1970 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]).
1971 ArgType = adjustParameterType(ArgType);
1974 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc,
1975 LookupOrdinaryName, ForRedeclaration);
1977 if (R.isSingleResult()) {
1978 NamedDecl *PrevDecl = R.getFoundDecl();
1979 if (S->isDeclScope(PrevDecl)) {
1980 Diag(ArgInfo[i].NameLoc,
1981 (MethodDefinition ? diag::warn_method_param_redefinition
1982 : diag::warn_method_param_declaration))
1984 Diag(PrevDecl->getLocation(),
1985 diag::note_previous_declaration);
1989 SourceLocation StartLoc = DI
1990 ? DI->getTypeLoc().getBeginLoc()
1991 : ArgInfo[i].NameLoc;
1993 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc,
1994 ArgInfo[i].NameLoc, ArgInfo[i].Name,
1995 ArgType, DI, SC_None, SC_None);
1997 Param->setObjCMethodScopeInfo(i);
1999 Param->setObjCDeclQualifier(
2000 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier()));
2002 // Apply the attributes to the parameter.
2003 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs);
2006 IdResolver.AddDecl(Param);
2008 Params.push_back(Param);
2011 for (unsigned i = 0, e = CNumArgs; i != e; ++i) {
2012 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param);
2013 QualType ArgType = Param->getType();
2014 if (ArgType.isNull())
2015 ArgType = Context.getObjCIdType();
2017 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]).
2018 ArgType = adjustParameterType(ArgType);
2019 if (ArgType->isObjCObjectType()) {
2020 Diag(Param->getLocation(),
2021 diag::err_object_cannot_be_passed_returned_by_value)
2023 Param->setInvalidDecl();
2025 Param->setDeclContext(ObjCMethod);
2027 Params.push_back(Param);
2030 ObjCMethod->setMethodParams(Context, Params.data(), Params.size(),
2032 ObjCMethod->setObjCDeclQualifier(
2033 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier()));
2034 const ObjCMethodDecl *PrevMethod = 0;
2037 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList);
2039 const ObjCMethodDecl *InterfaceMD = 0;
2041 // Add the method now.
2042 if (ObjCImplementationDecl *ImpDecl =
2043 dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
2044 if (MethodType == tok::minus) {
2045 PrevMethod = ImpDecl->getInstanceMethod(Sel);
2046 ImpDecl->addInstanceMethod(ObjCMethod);
2048 PrevMethod = ImpDecl->getClassMethod(Sel);
2049 ImpDecl->addClassMethod(ObjCMethod);
2051 InterfaceMD = ImpDecl->getClassInterface()->getMethod(Sel,
2052 MethodType == tok::minus);
2054 if (ObjCMethod->hasAttrs() &&
2055 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs()))
2056 Diag(EndLoc, diag::warn_attribute_method_def);
2057 } else if (ObjCCategoryImplDecl *CatImpDecl =
2058 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) {
2059 if (MethodType == tok::minus) {
2060 PrevMethod = CatImpDecl->getInstanceMethod(Sel);
2061 CatImpDecl->addInstanceMethod(ObjCMethod);
2063 PrevMethod = CatImpDecl->getClassMethod(Sel);
2064 CatImpDecl->addClassMethod(ObjCMethod);
2067 if (ObjCCategoryDecl *Cat = CatImpDecl->getCategoryDecl())
2068 InterfaceMD = Cat->getMethod(Sel, MethodType == tok::minus);
2070 if (ObjCMethod->hasAttrs() &&
2071 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs()))
2072 Diag(EndLoc, diag::warn_attribute_method_def);
2074 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod);
2077 // You can never have two method definitions with the same name.
2078 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl)
2079 << ObjCMethod->getDeclName();
2080 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2083 // If this Objective-C method does not have a related result type, but we
2084 // are allowed to infer related result types, try to do so based on the
2086 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl);
2087 if (!CurrentClass) {
2088 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl))
2089 CurrentClass = Cat->getClassInterface();
2090 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl))
2091 CurrentClass = Impl->getClassInterface();
2092 else if (ObjCCategoryImplDecl *CatImpl
2093 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl))
2094 CurrentClass = CatImpl->getClassInterface();
2097 // Merge information down from the interface declaration if we have one.
2099 // Inherit the related result type, if we can.
2100 if (InterfaceMD->hasRelatedResultType() &&
2101 !CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass))
2102 ObjCMethod->SetRelatedResultType();
2104 mergeObjCMethodDecls(ObjCMethod, InterfaceMD);
2107 if (!ObjCMethod->hasRelatedResultType() &&
2108 getLangOptions().ObjCInferRelatedResultType) {
2109 bool InferRelatedResultType = false;
2110 switch (ObjCMethod->getMethodFamily()) {
2114 case OMF_mutableCopy:
2116 case OMF_retainCount:
2121 InferRelatedResultType = ObjCMethod->isClassMethod();
2125 case OMF_autorelease:
2128 InferRelatedResultType = ObjCMethod->isInstanceMethod();
2132 if (InferRelatedResultType &&
2133 !CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass))
2134 ObjCMethod->SetRelatedResultType();
2137 anyMethodInfersRelatedResultType(*this, ObjCMethod->getSelector(),
2138 ObjCMethod->isInstanceMethod()))
2139 CheckObjCMethodOverrides(ObjCMethod, cast<DeclContext>(ClassDecl));
2145 bool Sema::CheckObjCDeclScope(Decl *D) {
2146 if (isa<TranslationUnitDecl>(CurContext->getRedeclContext()))
2149 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope);
2150 D->setInvalidDecl();
2155 /// Called whenever @defs(ClassName) is encountered in the source. Inserts the
2156 /// instance variables of ClassName into Decls.
2157 void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
2158 IdentifierInfo *ClassName,
2159 llvm::SmallVectorImpl<Decl*> &Decls) {
2160 // Check that ClassName is a valid class
2161 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart);
2163 Diag(DeclStart, diag::err_undef_interface) << ClassName;
2166 if (LangOpts.ObjCNonFragileABI) {
2167 Diag(DeclStart, diag::err_atdef_nonfragile_interface);
2171 // Collect the instance variables
2172 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars;
2173 Context.DeepCollectObjCIvars(Class, true, Ivars);
2174 // For each ivar, create a fresh ObjCAtDefsFieldDecl.
2175 for (unsigned i = 0; i < Ivars.size(); i++) {
2176 FieldDecl* ID = cast<FieldDecl>(Ivars[i]);
2177 RecordDecl *Record = dyn_cast<RecordDecl>(TagD);
2178 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record,
2179 /*FIXME: StartL=*/ID->getLocation(),
2181 ID->getIdentifier(), ID->getType(),
2183 Decls.push_back(FD);
2186 // Introduce all of these fields into the appropriate scope.
2187 for (llvm::SmallVectorImpl<Decl*>::iterator D = Decls.begin();
2188 D != Decls.end(); ++D) {
2189 FieldDecl *FD = cast<FieldDecl>(*D);
2190 if (getLangOptions().CPlusPlus)
2191 PushOnScopeChains(cast<FieldDecl>(FD), S);
2192 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD))
2193 Record->addDecl(FD);
2197 /// \brief Build a type-check a new Objective-C exception variable declaration.
2198 VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T,
2199 SourceLocation StartLoc,
2200 SourceLocation IdLoc,
2203 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
2204 // duration shall not be qualified by an address-space qualifier."
2205 // Since all parameters have automatic store duration, they can not have
2206 // an address space.
2207 if (T.getAddressSpace() != 0) {
2208 Diag(IdLoc, diag::err_arg_with_address_space);
2212 // An @catch parameter must be an unqualified object pointer type;
2213 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"?
2215 // Don't do any further checking.
2216 } else if (T->isDependentType()) {
2217 // Okay: we don't know what this type will instantiate to.
2218 } else if (!T->isObjCObjectPointerType()) {
2220 Diag(IdLoc ,diag::err_catch_param_not_objc_type);
2221 } else if (T->isObjCQualifiedIdType()) {
2223 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm);
2226 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id,
2227 T, TInfo, SC_None, SC_None);
2228 New->setExceptionVariable(true);
2231 New->setInvalidDecl();
2235 Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) {
2236 const DeclSpec &DS = D.getDeclSpec();
2238 // We allow the "register" storage class on exception variables because
2239 // GCC did, but we drop it completely. Any other storage class is an error.
2240 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
2241 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm)
2242 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc()));
2243 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
2244 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm)
2245 << DS.getStorageClassSpec();
2247 if (D.getDeclSpec().isThreadSpecified())
2248 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
2249 D.getMutableDeclSpec().ClearStorageClassSpecs();
2251 DiagnoseFunctionSpecifiers(D);
2253 // Check that there are no default arguments inside the type of this
2254 // exception object (C++ only).
2255 if (getLangOptions().CPlusPlus)
2256 CheckExtraCXXDefaultArguments(D);
2258 TagDecl *OwnedDecl = 0;
2259 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl);
2260 QualType ExceptionType = TInfo->getType();
2262 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) {
2263 // Objective-C++: Types shall not be defined in exception types.
2264 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type)
2265 << Context.getTypeDeclType(OwnedDecl);
2268 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType,
2269 D.getSourceRange().getBegin(),
2270 D.getIdentifierLoc(),
2274 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
2275 if (D.getCXXScopeSpec().isSet()) {
2276 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm)
2277 << D.getCXXScopeSpec().getRange();
2278 New->setInvalidDecl();
2281 // Add the parameter declaration into this scope.
2283 if (D.getIdentifier())
2284 IdResolver.AddDecl(New);
2286 ProcessDeclAttributes(S, New, D);
2288 if (New->hasAttr<BlocksAttr>())
2289 Diag(New->getLocation(), diag::err_block_on_nonlocal);
2293 /// CollectIvarsToConstructOrDestruct - Collect those ivars which require
2295 void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
2296 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) {
2297 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv;
2298 Iv= Iv->getNextIvar()) {
2299 QualType QT = Context.getBaseElementType(Iv->getType());
2300 if (QT->isRecordType())
2301 Ivars.push_back(Iv);
2305 void ObjCImplementationDecl::setIvarInitializers(ASTContext &C,
2306 CXXCtorInitializer ** initializers,
2307 unsigned numInitializers) {
2308 if (numInitializers > 0) {
2309 NumIvarInitializers = numInitializers;
2310 CXXCtorInitializer **ivarInitializers =
2311 new (C) CXXCtorInitializer*[NumIvarInitializers];
2312 memcpy(ivarInitializers, initializers,
2313 numInitializers * sizeof(CXXCtorInitializer*));
2314 IvarInitializers = ivarInitializers;
2318 void Sema::DiagnoseUseOfUnimplementedSelectors() {
2319 // Warning will be issued only when selector table is
2320 // generated (which means there is at lease one implementation
2321 // in the TU). This is to match gcc's behavior.
2322 if (ReferencedSelectors.empty() ||
2323 !Context.AnyObjCImplementation())
2325 for (llvm::DenseMap<Selector, SourceLocation>::iterator S =
2326 ReferencedSelectors.begin(),
2327 E = ReferencedSelectors.end(); S != E; ++S) {
2328 Selector Sel = (*S).first;
2329 if (!LookupImplementedMethodInGlobalPool(Sel))
2330 Diag((*S).second, diag::warn_unimplemented_selector) << Sel;