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Diffstat (limited to 'lib/Sema/SemaDeclObjC.cpp')
| -rw-r--r-- | lib/Sema/SemaDeclObjC.cpp | 2166 |
1 files changed, 2166 insertions, 0 deletions
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp new file mode 100644 index 000000000000..8f580341bdc6 --- /dev/null +++ b/lib/Sema/SemaDeclObjC.cpp @@ -0,0 +1,2166 @@ +//===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC Declarations -------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements semantic analysis for Objective C declarations. +// +//===----------------------------------------------------------------------===// + +#include "Sema.h" +#include "clang/Sema/ExternalSemaSource.h" +#include "clang/AST/Expr.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclObjC.h" +#include "clang/Parse/DeclSpec.h" +using namespace clang; + +bool Sema::DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *property, + ObjCMethodDecl *GetterMethod, + SourceLocation Loc) { + if (GetterMethod && + GetterMethod->getResultType() != property->getType()) { + AssignConvertType result = Incompatible; + if (Context.isObjCObjectPointerType(property->getType())) + result = CheckAssignmentConstraints(GetterMethod->getResultType(), property->getType()); + if (result != Compatible) { + Diag(Loc, diag::warn_accessor_property_type_mismatch) + << property->getDeclName() + << GetterMethod->getSelector(); + Diag(GetterMethod->getLocation(), diag::note_declared_at); + return true; + } + } + return false; +} + +/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible +/// and user declared, in the method definition's AST. +void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, DeclPtrTy D) { + assert(getCurMethodDecl() == 0 && "Method parsing confused"); + ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D.getAs<Decl>()); + + // If we don't have a valid method decl, simply return. + if (!MDecl) + return; + + CurFunctionNeedsScopeChecking = false; + + // Allow the rest of sema to find private method decl implementations. + if (MDecl->isInstanceMethod()) + AddInstanceMethodToGlobalPool(MDecl); + else + AddFactoryMethodToGlobalPool(MDecl); + + // Allow all of Sema to see that we are entering a method definition. + PushDeclContext(FnBodyScope, MDecl); + + // Create Decl objects for each parameter, entrring them in the scope for + // binding to their use. + + // Insert the invisible arguments, self and _cmd! + MDecl->createImplicitParams(Context, MDecl->getClassInterface()); + + PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); + PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); + + // Introduce all of the other parameters into this scope. + for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), + E = MDecl->param_end(); PI != E; ++PI) + if ((*PI)->getIdentifier()) + PushOnScopeChains(*PI, FnBodyScope); +} + +Sema::DeclPtrTy Sema:: +ActOnStartClassInterface(SourceLocation AtInterfaceLoc, + IdentifierInfo *ClassName, SourceLocation ClassLoc, + IdentifierInfo *SuperName, SourceLocation SuperLoc, + const DeclPtrTy *ProtoRefs, unsigned NumProtoRefs, + SourceLocation EndProtoLoc, AttributeList *AttrList) { + assert(ClassName && "Missing class identifier"); + + // Check for another declaration kind with the same name. + NamedDecl *PrevDecl = LookupName(TUScope, ClassName, LookupOrdinaryName); + if (PrevDecl && PrevDecl->isTemplateParameter()) { + // Maybe we will complain about the shadowed template parameter. + DiagnoseTemplateParameterShadow(ClassLoc, PrevDecl); + // Just pretend that we didn't see the previous declaration. + PrevDecl = 0; + } + + if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { + Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + } + + ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); + if (IDecl) { + // Class already seen. Is it a forward declaration? + if (!IDecl->isForwardDecl()) { + IDecl->setInvalidDecl(); + Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName(); + Diag(IDecl->getLocation(), diag::note_previous_definition); + + // Return the previous class interface. + // FIXME: don't leak the objects passed in! + return DeclPtrTy::make(IDecl); + } else { + IDecl->setLocation(AtInterfaceLoc); + IDecl->setForwardDecl(false); + } + } else { + IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, + ClassName, ClassLoc); + if (AttrList) + ProcessDeclAttributeList(IDecl, AttrList); + + PushOnScopeChains(IDecl, TUScope); + } + + if (SuperName) { + // Check if a different kind of symbol declared in this scope. + PrevDecl = LookupName(TUScope, SuperName, LookupOrdinaryName); + + ObjCInterfaceDecl *SuperClassDecl = + dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); + + // Diagnose classes that inherit from deprecated classes. + if (SuperClassDecl) + (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); + + if (PrevDecl && SuperClassDecl == 0) { + // The previous declaration was not a class decl. Check if we have a + // typedef. If we do, get the underlying class type. + if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(PrevDecl)) { + QualType T = TDecl->getUnderlyingType(); + if (T->isObjCInterfaceType()) { + if (NamedDecl *IDecl = T->getAsObjCInterfaceType()->getDecl()) + SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); + } + } + + // This handles the following case: + // + // typedef int SuperClass; + // @interface MyClass : SuperClass {} @end + // + if (!SuperClassDecl) { + Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + } + } + + if (!dyn_cast_or_null<TypedefDecl>(PrevDecl)) { + if (!SuperClassDecl) + Diag(SuperLoc, diag::err_undef_superclass) + << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); + else if (SuperClassDecl->isForwardDecl()) + Diag(SuperLoc, diag::err_undef_superclass) + << SuperClassDecl->getDeclName() << ClassName + << SourceRange(AtInterfaceLoc, ClassLoc); + } + IDecl->setSuperClass(SuperClassDecl); + IDecl->setSuperClassLoc(SuperLoc); + IDecl->setLocEnd(SuperLoc); + } else { // we have a root class. + IDecl->setLocEnd(ClassLoc); + } + + /// Check then save referenced protocols. + if (NumProtoRefs) { + IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, + Context); + IDecl->setLocEnd(EndProtoLoc); + } + + CheckObjCDeclScope(IDecl); + return DeclPtrTy::make(IDecl); +} + +/// ActOnCompatiblityAlias - this action is called after complete parsing of +/// @compatibility_alias declaration. It sets up the alias relationships. +Sema::DeclPtrTy Sema::ActOnCompatiblityAlias(SourceLocation AtLoc, + IdentifierInfo *AliasName, + SourceLocation AliasLocation, + IdentifierInfo *ClassName, + SourceLocation ClassLocation) { + // Look for previous declaration of alias name + NamedDecl *ADecl = LookupName(TUScope, AliasName, LookupOrdinaryName); + if (ADecl) { + if (isa<ObjCCompatibleAliasDecl>(ADecl)) + Diag(AliasLocation, diag::warn_previous_alias_decl); + else + Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; + Diag(ADecl->getLocation(), diag::note_previous_declaration); + return DeclPtrTy(); + } + // Check for class declaration + NamedDecl *CDeclU = LookupName(TUScope, ClassName, LookupOrdinaryName); + if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(CDeclU)) { + QualType T = TDecl->getUnderlyingType(); + if (T->isObjCInterfaceType()) { + if (NamedDecl *IDecl = T->getAsObjCInterfaceType()->getDecl()) { + ClassName = IDecl->getIdentifier(); + CDeclU = LookupName(TUScope, ClassName, LookupOrdinaryName); + } + } + } + ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); + if (CDecl == 0) { + Diag(ClassLocation, diag::warn_undef_interface) << ClassName; + if (CDeclU) + Diag(CDeclU->getLocation(), diag::note_previous_declaration); + return DeclPtrTy(); + } + + // Everything checked out, instantiate a new alias declaration AST. + ObjCCompatibleAliasDecl *AliasDecl = + ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); + + if (!CheckObjCDeclScope(AliasDecl)) + PushOnScopeChains(AliasDecl, TUScope); + + return DeclPtrTy::make(AliasDecl); +} + +void Sema::CheckForwardProtocolDeclarationForCircularDependency( + IdentifierInfo *PName, + SourceLocation &Ploc, SourceLocation PrevLoc, + const ObjCList<ObjCProtocolDecl> &PList) +{ + for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), + E = PList.end(); I != E; ++I) { + + if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier())) { + if (PDecl->getIdentifier() == PName) { + Diag(Ploc, diag::err_protocol_has_circular_dependency); + Diag(PrevLoc, diag::note_previous_definition); + } + CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, + PDecl->getLocation(), PDecl->getReferencedProtocols()); + } + } +} + +Sema::DeclPtrTy +Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, + IdentifierInfo *ProtocolName, + SourceLocation ProtocolLoc, + const DeclPtrTy *ProtoRefs, + unsigned NumProtoRefs, + SourceLocation EndProtoLoc, + AttributeList *AttrList) { + // FIXME: Deal with AttrList. + assert(ProtocolName && "Missing protocol identifier"); + ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName); + if (PDecl) { + // Protocol already seen. Better be a forward protocol declaration + if (!PDecl->isForwardDecl()) { + Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; + Diag(PDecl->getLocation(), diag::note_previous_definition); + // Just return the protocol we already had. + // FIXME: don't leak the objects passed in! + return DeclPtrTy::make(PDecl); + } + ObjCList<ObjCProtocolDecl> PList; + PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); + CheckForwardProtocolDeclarationForCircularDependency( + ProtocolName, ProtocolLoc, PDecl->getLocation(), PList); + PList.Destroy(Context); + + // Make sure the cached decl gets a valid start location. + PDecl->setLocation(AtProtoInterfaceLoc); + PDecl->setForwardDecl(false); + } else { + PDecl = ObjCProtocolDecl::Create(Context, CurContext, + AtProtoInterfaceLoc,ProtocolName); + PushOnScopeChains(PDecl, TUScope); + PDecl->setForwardDecl(false); + } + if (AttrList) + ProcessDeclAttributeList(PDecl, AttrList); + if (NumProtoRefs) { + /// Check then save referenced protocols. + PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,Context); + PDecl->setLocEnd(EndProtoLoc); + } + + CheckObjCDeclScope(PDecl); + return DeclPtrTy::make(PDecl); +} + +/// FindProtocolDeclaration - This routine looks up protocols and +/// issues an error if they are not declared. It returns list of +/// protocol declarations in its 'Protocols' argument. +void +Sema::FindProtocolDeclaration(bool WarnOnDeclarations, + const IdentifierLocPair *ProtocolId, + unsigned NumProtocols, + llvm::SmallVectorImpl<DeclPtrTy> &Protocols) { + for (unsigned i = 0; i != NumProtocols; ++i) { + ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first); + if (!PDecl) { + Diag(ProtocolId[i].second, diag::err_undeclared_protocol) + << ProtocolId[i].first; + continue; + } + + (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); + + // If this is a forward declaration and we are supposed to warn in this + // case, do it. + if (WarnOnDeclarations && PDecl->isForwardDecl()) + Diag(ProtocolId[i].second, diag::warn_undef_protocolref) + << ProtocolId[i].first; + Protocols.push_back(DeclPtrTy::make(PDecl)); + } +} + +/// DiagnosePropertyMismatch - Compares two properties for their +/// attributes and types and warns on a variety of inconsistencies. +/// +void +Sema::DiagnosePropertyMismatch(ObjCPropertyDecl *Property, + ObjCPropertyDecl *SuperProperty, + const IdentifierInfo *inheritedName) { + ObjCPropertyDecl::PropertyAttributeKind CAttr = + Property->getPropertyAttributes(); + ObjCPropertyDecl::PropertyAttributeKind SAttr = + SuperProperty->getPropertyAttributes(); + if ((CAttr & ObjCPropertyDecl::OBJC_PR_readonly) + && (SAttr & ObjCPropertyDecl::OBJC_PR_readwrite)) + Diag(Property->getLocation(), diag::warn_readonly_property) + << Property->getDeclName() << inheritedName; + if ((CAttr & ObjCPropertyDecl::OBJC_PR_copy) + != (SAttr & ObjCPropertyDecl::OBJC_PR_copy)) + Diag(Property->getLocation(), diag::warn_property_attribute) + << Property->getDeclName() << "copy" << inheritedName; + else if ((CAttr & ObjCPropertyDecl::OBJC_PR_retain) + != (SAttr & ObjCPropertyDecl::OBJC_PR_retain)) + Diag(Property->getLocation(), diag::warn_property_attribute) + << Property->getDeclName() << "retain" << inheritedName; + + if ((CAttr & ObjCPropertyDecl::OBJC_PR_nonatomic) + != (SAttr & ObjCPropertyDecl::OBJC_PR_nonatomic)) + Diag(Property->getLocation(), diag::warn_property_attribute) + << Property->getDeclName() << "atomic" << inheritedName; + if (Property->getSetterName() != SuperProperty->getSetterName()) + Diag(Property->getLocation(), diag::warn_property_attribute) + << Property->getDeclName() << "setter" << inheritedName; + if (Property->getGetterName() != SuperProperty->getGetterName()) + Diag(Property->getLocation(), diag::warn_property_attribute) + << Property->getDeclName() << "getter" << inheritedName; + + QualType LHSType = + Context.getCanonicalType(SuperProperty->getType()); + QualType RHSType = + Context.getCanonicalType(Property->getType()); + + if (!Context.typesAreCompatible(LHSType, RHSType)) { + // FIXME: Incorporate this test with typesAreCompatible. + if (LHSType->isObjCQualifiedIdType() && RHSType->isObjCQualifiedIdType()) + if (ObjCQualifiedIdTypesAreCompatible(LHSType, RHSType, false)) + return; + Diag(Property->getLocation(), diag::warn_property_types_are_incompatible) + << Property->getType() << SuperProperty->getType() << inheritedName; + } +} + +/// ComparePropertiesInBaseAndSuper - This routine compares property +/// declarations in base and its super class, if any, and issues +/// diagnostics in a variety of inconsistant situations. +/// +void Sema::ComparePropertiesInBaseAndSuper(ObjCInterfaceDecl *IDecl) { + ObjCInterfaceDecl *SDecl = IDecl->getSuperClass(); + if (!SDecl) + return; + // FIXME: O(N^2) + for (ObjCInterfaceDecl::prop_iterator S = SDecl->prop_begin(Context), + E = SDecl->prop_end(Context); S != E; ++S) { + ObjCPropertyDecl *SuperPDecl = (*S); + // Does property in super class has declaration in current class? + for (ObjCInterfaceDecl::prop_iterator I = IDecl->prop_begin(Context), + E = IDecl->prop_end(Context); I != E; ++I) { + ObjCPropertyDecl *PDecl = (*I); + if (SuperPDecl->getIdentifier() == PDecl->getIdentifier()) + DiagnosePropertyMismatch(PDecl, SuperPDecl, + SDecl->getIdentifier()); + } + } +} + +/// MergeOneProtocolPropertiesIntoClass - This routine goes thru the list +/// of properties declared in a protocol and adds them to the list +/// of properties for current class/category if it is not there already. +void +Sema::MergeOneProtocolPropertiesIntoClass(Decl *CDecl, + ObjCProtocolDecl *PDecl) { + ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDecl); + if (!IDecl) { + // Category + ObjCCategoryDecl *CatDecl = static_cast<ObjCCategoryDecl*>(CDecl); + assert (CatDecl && "MergeOneProtocolPropertiesIntoClass"); + for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(Context), + E = PDecl->prop_end(Context); P != E; ++P) { + ObjCPropertyDecl *Pr = (*P); + ObjCCategoryDecl::prop_iterator CP, CE; + // Is this property already in category's list of properties? + for (CP = CatDecl->prop_begin(Context), CE = CatDecl->prop_end(Context); + CP != CE; ++CP) + if ((*CP)->getIdentifier() == Pr->getIdentifier()) + break; + if (CP != CE) + // Property protocol already exist in class. Diagnose any mismatch. + DiagnosePropertyMismatch((*CP), Pr, PDecl->getIdentifier()); + } + return; + } + for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(Context), + E = PDecl->prop_end(Context); P != E; ++P) { + ObjCPropertyDecl *Pr = (*P); + ObjCInterfaceDecl::prop_iterator CP, CE; + // Is this property already in class's list of properties? + for (CP = IDecl->prop_begin(Context), CE = IDecl->prop_end(Context); + CP != CE; ++CP) + if ((*CP)->getIdentifier() == Pr->getIdentifier()) + break; + if (CP != CE) + // Property protocol already exist in class. Diagnose any mismatch. + DiagnosePropertyMismatch((*CP), Pr, PDecl->getIdentifier()); + } +} + +/// MergeProtocolPropertiesIntoClass - This routine merges properties +/// declared in 'MergeItsProtocols' objects (which can be a class or an +/// inherited protocol into the list of properties for class/category 'CDecl' +/// +void Sema::MergeProtocolPropertiesIntoClass(Decl *CDecl, + DeclPtrTy MergeItsProtocols) { + Decl *ClassDecl = MergeItsProtocols.getAs<Decl>(); + ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDecl); + + if (!IDecl) { + // Category + ObjCCategoryDecl *CatDecl = static_cast<ObjCCategoryDecl*>(CDecl); + assert (CatDecl && "MergeProtocolPropertiesIntoClass"); + if (ObjCCategoryDecl *MDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { + for (ObjCCategoryDecl::protocol_iterator P = MDecl->protocol_begin(), + E = MDecl->protocol_end(); P != E; ++P) + // Merge properties of category (*P) into IDECL's + MergeOneProtocolPropertiesIntoClass(CatDecl, *P); + + // Go thru the list of protocols for this category and recursively merge + // their properties into this class as well. + for (ObjCCategoryDecl::protocol_iterator P = CatDecl->protocol_begin(), + E = CatDecl->protocol_end(); P != E; ++P) + MergeProtocolPropertiesIntoClass(CatDecl, DeclPtrTy::make(*P)); + } else { + ObjCProtocolDecl *MD = cast<ObjCProtocolDecl>(ClassDecl); + for (ObjCProtocolDecl::protocol_iterator P = MD->protocol_begin(), + E = MD->protocol_end(); P != E; ++P) + MergeOneProtocolPropertiesIntoClass(CatDecl, *P); + } + return; + } + + if (ObjCInterfaceDecl *MDecl = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { + for (ObjCInterfaceDecl::protocol_iterator P = MDecl->protocol_begin(), + E = MDecl->protocol_end(); P != E; ++P) + // Merge properties of class (*P) into IDECL's + MergeOneProtocolPropertiesIntoClass(IDecl, *P); + + // Go thru the list of protocols for this class and recursively merge + // their properties into this class as well. + for (ObjCInterfaceDecl::protocol_iterator P = IDecl->protocol_begin(), + E = IDecl->protocol_end(); P != E; ++P) + MergeProtocolPropertiesIntoClass(IDecl, DeclPtrTy::make(*P)); + } else { + ObjCProtocolDecl *MD = cast<ObjCProtocolDecl>(ClassDecl); + for (ObjCProtocolDecl::protocol_iterator P = MD->protocol_begin(), + E = MD->protocol_end(); P != E; ++P) + MergeOneProtocolPropertiesIntoClass(IDecl, *P); + } +} + +/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of +/// a class method in its extension. +/// +void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, + ObjCInterfaceDecl *ID) { + if (!ID) + return; // Possibly due to previous error + + llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; + for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(Context), + e = ID->meth_end(Context); i != e; ++i) { + ObjCMethodDecl *MD = *i; + MethodMap[MD->getSelector()] = MD; + } + + if (MethodMap.empty()) + return; + for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(Context), + e = CAT->meth_end(Context); i != e; ++i) { + ObjCMethodDecl *Method = *i; + const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; + if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { + Diag(Method->getLocation(), diag::err_duplicate_method_decl) + << Method->getDeclName(); + Diag(PrevMethod->getLocation(), diag::note_previous_declaration); + } + } +} + +/// ActOnForwardProtocolDeclaration - Handle @protocol foo; +Action::DeclPtrTy +Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, + const IdentifierLocPair *IdentList, + unsigned NumElts, + AttributeList *attrList) { + llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols; + + for (unsigned i = 0; i != NumElts; ++i) { + IdentifierInfo *Ident = IdentList[i].first; + ObjCProtocolDecl *PDecl = LookupProtocol(Ident); + if (PDecl == 0) { // Not already seen? + PDecl = ObjCProtocolDecl::Create(Context, CurContext, + IdentList[i].second, Ident); + PushOnScopeChains(PDecl, TUScope); + } + if (attrList) + ProcessDeclAttributeList(PDecl, attrList); + Protocols.push_back(PDecl); + } + + ObjCForwardProtocolDecl *PDecl = + ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc, + &Protocols[0], Protocols.size()); + CurContext->addDecl(Context, PDecl); + CheckObjCDeclScope(PDecl); + return DeclPtrTy::make(PDecl); +} + +Sema::DeclPtrTy Sema:: +ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, + IdentifierInfo *ClassName, SourceLocation ClassLoc, + IdentifierInfo *CategoryName, + SourceLocation CategoryLoc, + const DeclPtrTy *ProtoRefs, + unsigned NumProtoRefs, + SourceLocation EndProtoLoc) { + ObjCCategoryDecl *CDecl = + ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, CategoryName); + // FIXME: PushOnScopeChains? + CurContext->addDecl(Context, CDecl); + + ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName); + /// Check that class of this category is already completely declared. + if (!IDecl || IDecl->isForwardDecl()) { + CDecl->setInvalidDecl(); + Diag(ClassLoc, diag::err_undef_interface) << ClassName; + return DeclPtrTy::make(CDecl); + } + + CDecl->setClassInterface(IDecl); + + // If the interface is deprecated, warn about it. + (void)DiagnoseUseOfDecl(IDecl, ClassLoc); + + /// Check for duplicate interface declaration for this category + ObjCCategoryDecl *CDeclChain; + for (CDeclChain = IDecl->getCategoryList(); CDeclChain; + CDeclChain = CDeclChain->getNextClassCategory()) { + if (CategoryName && CDeclChain->getIdentifier() == CategoryName) { + Diag(CategoryLoc, diag::warn_dup_category_def) + << ClassName << CategoryName; + Diag(CDeclChain->getLocation(), diag::note_previous_definition); + break; + } + } + if (!CDeclChain) + CDecl->insertNextClassCategory(); + + if (NumProtoRefs) { + CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,Context); + CDecl->setLocEnd(EndProtoLoc); + } + + CheckObjCDeclScope(CDecl); + return DeclPtrTy::make(CDecl); +} + +/// ActOnStartCategoryImplementation - Perform semantic checks on the +/// category implementation declaration and build an ObjCCategoryImplDecl +/// object. +Sema::DeclPtrTy Sema::ActOnStartCategoryImplementation( + SourceLocation AtCatImplLoc, + IdentifierInfo *ClassName, SourceLocation ClassLoc, + IdentifierInfo *CatName, SourceLocation CatLoc) { + ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName); + ObjCCategoryImplDecl *CDecl = + ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName, + IDecl); + /// Check that class of this category is already completely declared. + if (!IDecl || IDecl->isForwardDecl()) + Diag(ClassLoc, diag::err_undef_interface) << ClassName; + + // FIXME: PushOnScopeChains? + CurContext->addDecl(Context, CDecl); + + /// TODO: Check that CatName, category name, is not used in another + // implementation. + ObjCCategoryImpls.push_back(CDecl); + + CheckObjCDeclScope(CDecl); + return DeclPtrTy::make(CDecl); +} + +Sema::DeclPtrTy Sema::ActOnStartClassImplementation( + SourceLocation AtClassImplLoc, + IdentifierInfo *ClassName, SourceLocation ClassLoc, + IdentifierInfo *SuperClassname, + SourceLocation SuperClassLoc) { + ObjCInterfaceDecl* IDecl = 0; + // Check for another declaration kind with the same name. + NamedDecl *PrevDecl = LookupName(TUScope, ClassName, LookupOrdinaryName); + if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { + Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + } else { + // Is there an interface declaration of this class; if not, warn! + IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); + if (!IDecl || IDecl->isForwardDecl()) { + Diag(ClassLoc, diag::warn_undef_interface) << ClassName; + IDecl = 0; + } + } + + // Check that super class name is valid class name + ObjCInterfaceDecl* SDecl = 0; + if (SuperClassname) { + // Check if a different kind of symbol declared in this scope. + PrevDecl = LookupName(TUScope, SuperClassname, LookupOrdinaryName); + if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { + Diag(SuperClassLoc, diag::err_redefinition_different_kind) + << SuperClassname; + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + } else { + SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); + if (!SDecl) + Diag(SuperClassLoc, diag::err_undef_superclass) + << SuperClassname << ClassName; + else if (IDecl && IDecl->getSuperClass() != SDecl) { + // This implementation and its interface do not have the same + // super class. + Diag(SuperClassLoc, diag::err_conflicting_super_class) + << SDecl->getDeclName(); + Diag(SDecl->getLocation(), diag::note_previous_definition); + } + } + } + + if (!IDecl) { + // Legacy case of @implementation with no corresponding @interface. + // Build, chain & install the interface decl into the identifier. + + // FIXME: Do we support attributes on the @implementation? If so we should + // copy them over. + IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, + ClassName, ClassLoc, false, true); + IDecl->setSuperClass(SDecl); + IDecl->setLocEnd(ClassLoc); + + PushOnScopeChains(IDecl, TUScope); + } else { + // Mark the interface as being completed, even if it was just as + // @class ....; + // declaration; the user cannot reopen it. + IDecl->setForwardDecl(false); + } + + ObjCImplementationDecl* IMPDecl = + ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc, + IDecl, SDecl); + + if (CheckObjCDeclScope(IMPDecl)) + return DeclPtrTy::make(IMPDecl); + + // Check that there is no duplicate implementation of this class. + if (LookupObjCImplementation(ClassName)) + // FIXME: Don't leak everything! + Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; + else // add it to the list. + PushOnScopeChains(IMPDecl, TUScope); + return DeclPtrTy::make(IMPDecl); +} + +void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, + ObjCIvarDecl **ivars, unsigned numIvars, + SourceLocation RBrace) { + assert(ImpDecl && "missing implementation decl"); + ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); + if (!IDecl) + return; + /// Check case of non-existing @interface decl. + /// (legacy objective-c @implementation decl without an @interface decl). + /// Add implementations's ivar to the synthesize class's ivar list. + if (IDecl->isImplicitInterfaceDecl()) { + IDecl->setIVarList(ivars, numIvars, Context); + IDecl->setLocEnd(RBrace); + return; + } + // If implementation has empty ivar list, just return. + if (numIvars == 0) + return; + + assert(ivars && "missing @implementation ivars"); + + // Check interface's Ivar list against those in the implementation. + // names and types must match. + // + unsigned j = 0; + ObjCInterfaceDecl::ivar_iterator + IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); + for (; numIvars > 0 && IVI != IVE; ++IVI) { + ObjCIvarDecl* ImplIvar = ivars[j++]; + ObjCIvarDecl* ClsIvar = *IVI; + assert (ImplIvar && "missing implementation ivar"); + assert (ClsIvar && "missing class ivar"); + + // First, make sure the types match. + if (Context.getCanonicalType(ImplIvar->getType()) != + Context.getCanonicalType(ClsIvar->getType())) { + Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) + << ImplIvar->getIdentifier() + << ImplIvar->getType() << ClsIvar->getType(); + Diag(ClsIvar->getLocation(), diag::note_previous_definition); + } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) { + Expr *ImplBitWidth = ImplIvar->getBitWidth(); + Expr *ClsBitWidth = ClsIvar->getBitWidth(); + if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() != + ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) { + Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth) + << ImplIvar->getIdentifier(); + Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition); + } + } + // Make sure the names are identical. + if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { + Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) + << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); + Diag(ClsIvar->getLocation(), diag::note_previous_definition); + } + --numIvars; + } + + if (numIvars > 0) + Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); + else if (IVI != IVE) + Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count); +} + +void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, + bool &IncompleteImpl) { + if (!IncompleteImpl) { + Diag(ImpLoc, diag::warn_incomplete_impl); + IncompleteImpl = true; + } + Diag(ImpLoc, diag::warn_undef_method_impl) << method->getDeclName(); +} + +void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, + ObjCMethodDecl *IntfMethodDecl) { + if (!Context.typesAreCompatible(IntfMethodDecl->getResultType(), + ImpMethodDecl->getResultType()) && + !QualifiedIdConformsQualifiedId(IntfMethodDecl->getResultType(), + ImpMethodDecl->getResultType())) { + Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_ret_types) + << ImpMethodDecl->getDeclName() << IntfMethodDecl->getResultType() + << ImpMethodDecl->getResultType(); + Diag(IntfMethodDecl->getLocation(), diag::note_previous_definition); + } + + for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), + IF = IntfMethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); + IM != EM; ++IM, ++IF) { + if (Context.typesAreCompatible((*IF)->getType(), (*IM)->getType()) || + QualifiedIdConformsQualifiedId((*IF)->getType(), (*IM)->getType())) + continue; + + Diag((*IM)->getLocation(), diag::warn_conflicting_param_types) + << ImpMethodDecl->getDeclName() << (*IF)->getType() + << (*IM)->getType(); + Diag((*IF)->getLocation(), diag::note_previous_definition); + } +} + +/// isPropertyReadonly - Return true if property is readonly, by searching +/// for the property in the class and in its categories and implementations +/// +bool Sema::isPropertyReadonly(ObjCPropertyDecl *PDecl, + ObjCInterfaceDecl *IDecl) { + // by far the most common case. + if (!PDecl->isReadOnly()) + return false; + // Even if property is ready only, if interface has a user defined setter, + // it is not considered read only. + if (IDecl->getInstanceMethod(Context, PDecl->getSetterName())) + return false; + + // Main class has the property as 'readonly'. Must search + // through the category list to see if the property's + // attribute has been over-ridden to 'readwrite'. + for (ObjCCategoryDecl *Category = IDecl->getCategoryList(); + Category; Category = Category->getNextClassCategory()) { + // Even if property is ready only, if a category has a user defined setter, + // it is not considered read only. + if (Category->getInstanceMethod(Context, PDecl->getSetterName())) + return false; + ObjCPropertyDecl *P = + Category->FindPropertyDeclaration(Context, PDecl->getIdentifier()); + if (P && !P->isReadOnly()) + return false; + } + + // Also, check for definition of a setter method in the implementation if + // all else failed. + if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(CurContext)) { + if (ObjCImplementationDecl *IMD = + dyn_cast<ObjCImplementationDecl>(OMD->getDeclContext())) { + if (IMD->getInstanceMethod(Context, PDecl->getSetterName())) + return false; + } + else if (ObjCCategoryImplDecl *CIMD = + dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) { + if (CIMD->getInstanceMethod(Context, PDecl->getSetterName())) + return false; + } + } + // Lastly, look through the implementation (if one is in scope). + if (ObjCImplementationDecl *ImpDecl + = LookupObjCImplementation(IDecl->getIdentifier())) + if (ImpDecl->getInstanceMethod(Context, PDecl->getSetterName())) + return false; + // If all fails, look at the super class. + if (ObjCInterfaceDecl *SIDecl = IDecl->getSuperClass()) + return isPropertyReadonly(PDecl, SIDecl); + return true; +} + +/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely +/// improve the efficiency of selector lookups and type checking by associating +/// with each protocol / interface / category the flattened instance tables. If +/// we used an immutable set to keep the table then it wouldn't add significant +/// memory cost and it would be handy for lookups. + +/// CheckProtocolMethodDefs - This routine checks unimplemented methods +/// Declared in protocol, and those referenced by it. +void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, + ObjCProtocolDecl *PDecl, + bool& IncompleteImpl, + const llvm::DenseSet<Selector> &InsMap, + const llvm::DenseSet<Selector> &ClsMap, + ObjCInterfaceDecl *IDecl) { + ObjCInterfaceDecl *Super = IDecl->getSuperClass(); + ObjCInterfaceDecl *NSIDecl = 0; + if (getLangOptions().NeXTRuntime) { + // check to see if class implements forwardInvocation method and objects + // of this class are derived from 'NSProxy' so that to forward requests + // from one object to another. + // Under such conditions, which means that every method possible is + // implemented in the class, we should not issue "Method definition not + // found" warnings. + // FIXME: Use a general GetUnarySelector method for this. + IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); + Selector fISelector = Context.Selectors.getSelector(1, &II); + if (InsMap.count(fISelector)) + // Is IDecl derived from 'NSProxy'? If so, no instance methods + // need be implemented in the implementation. + NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); + } + + // If a method lookup fails locally we still need to look and see if + // the method was implemented by a base class or an inherited + // protocol. This lookup is slow, but occurs rarely in correct code + // and otherwise would terminate in a warning. + + // check unimplemented instance methods. + if (!NSIDecl) + for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(Context), + E = PDecl->instmeth_end(Context); I != E; ++I) { + ObjCMethodDecl *method = *I; + if (method->getImplementationControl() != ObjCMethodDecl::Optional && + !method->isSynthesized() && !InsMap.count(method->getSelector()) && + (!Super || + !Super->lookupInstanceMethod(Context, method->getSelector()))) { + // Ugly, but necessary. Method declared in protcol might have + // have been synthesized due to a property declared in the class which + // uses the protocol. + ObjCMethodDecl *MethodInClass = + IDecl->lookupInstanceMethod(Context, method->getSelector()); + if (!MethodInClass || !MethodInClass->isSynthesized()) + WarnUndefinedMethod(ImpLoc, method, IncompleteImpl); + } + } + // check unimplemented class methods + for (ObjCProtocolDecl::classmeth_iterator + I = PDecl->classmeth_begin(Context), + E = PDecl->classmeth_end(Context); + I != E; ++I) { + ObjCMethodDecl *method = *I; + if (method->getImplementationControl() != ObjCMethodDecl::Optional && + !ClsMap.count(method->getSelector()) && + (!Super || !Super->lookupClassMethod(Context, method->getSelector()))) + WarnUndefinedMethod(ImpLoc, method, IncompleteImpl); + } + // Check on this protocols's referenced protocols, recursively. + for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), + E = PDecl->protocol_end(); PI != E; ++PI) + CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl); +} + +/// MatchAllMethodDeclarations - Check methods declaraed in interface or +/// or protocol against those declared in their implementations. +/// +void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap, + const llvm::DenseSet<Selector> &ClsMap, + llvm::DenseSet<Selector> &InsMapSeen, + llvm::DenseSet<Selector> &ClsMapSeen, + ObjCImplDecl* IMPDecl, + ObjCContainerDecl* CDecl, + bool &IncompleteImpl, + bool ImmediateClass) +{ + // Check and see if instance methods in class interface have been + // implemented in the implementation class. If so, their types match. + for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(Context), + E = CDecl->instmeth_end(Context); I != E; ++I) { + if (InsMapSeen.count((*I)->getSelector())) + continue; + InsMapSeen.insert((*I)->getSelector()); + if (!(*I)->isSynthesized() && + !InsMap.count((*I)->getSelector())) { + if (ImmediateClass) + WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl); + continue; + } + else { + ObjCMethodDecl *ImpMethodDecl = + IMPDecl->getInstanceMethod(Context, (*I)->getSelector()); + ObjCMethodDecl *IntfMethodDecl = + CDecl->getInstanceMethod(Context, (*I)->getSelector()); + assert(IntfMethodDecl && + "IntfMethodDecl is null in ImplMethodsVsClassMethods"); + // ImpMethodDecl may be null as in a @dynamic property. + if (ImpMethodDecl) + WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); + } + } + + // Check and see if class methods in class interface have been + // implemented in the implementation class. If so, their types match. + for (ObjCInterfaceDecl::classmeth_iterator + I = CDecl->classmeth_begin(Context), + E = CDecl->classmeth_end(Context); + I != E; ++I) { + if (ClsMapSeen.count((*I)->getSelector())) + continue; + ClsMapSeen.insert((*I)->getSelector()); + if (!ClsMap.count((*I)->getSelector())) { + if (ImmediateClass) + WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl); + } + else { + ObjCMethodDecl *ImpMethodDecl = + IMPDecl->getClassMethod(Context, (*I)->getSelector()); + ObjCMethodDecl *IntfMethodDecl = + CDecl->getClassMethod(Context, (*I)->getSelector()); + WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); + } + } + if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { + // Check for any implementation of a methods declared in protocol. + for (ObjCInterfaceDecl::protocol_iterator PI = I->protocol_begin(), + E = I->protocol_end(); PI != E; ++PI) + MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, + IMPDecl, + (*PI), IncompleteImpl, false); + if (I->getSuperClass()) + MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, + IMPDecl, + I->getSuperClass(), IncompleteImpl, false); + } +} + +void Sema::ImplMethodsVsClassMethods(ObjCImplDecl* IMPDecl, + ObjCContainerDecl* CDecl, + bool IncompleteImpl) { + llvm::DenseSet<Selector> InsMap; + // Check and see if instance methods in class interface have been + // implemented in the implementation class. + for (ObjCImplementationDecl::instmeth_iterator + I = IMPDecl->instmeth_begin(Context), + E = IMPDecl->instmeth_end(Context); I != E; ++I) + InsMap.insert((*I)->getSelector()); + + // Check and see if properties declared in the interface have either 1) + // an implementation or 2) there is a @synthesize/@dynamic implementation + // of the property in the @implementation. + if (isa<ObjCInterfaceDecl>(CDecl)) + for (ObjCContainerDecl::prop_iterator P = CDecl->prop_begin(Context), + E = CDecl->prop_end(Context); P != E; ++P) { + ObjCPropertyDecl *Prop = (*P); + if (Prop->isInvalidDecl()) + continue; + ObjCPropertyImplDecl *PI = 0; + // Is there a matching propery synthesize/dynamic? + for (ObjCImplDecl::propimpl_iterator + I = IMPDecl->propimpl_begin(Context), + EI = IMPDecl->propimpl_end(Context); I != EI; ++I) + if ((*I)->getPropertyDecl() == Prop) { + PI = (*I); + break; + } + if (PI) + continue; + if (!InsMap.count(Prop->getGetterName())) { + Diag(Prop->getLocation(), + diag::warn_setter_getter_impl_required) + << Prop->getDeclName() << Prop->getGetterName(); + Diag(IMPDecl->getLocation(), + diag::note_property_impl_required); + } + + if (!Prop->isReadOnly() && !InsMap.count(Prop->getSetterName())) { + Diag(Prop->getLocation(), + diag::warn_setter_getter_impl_required) + << Prop->getDeclName() << Prop->getSetterName(); + Diag(IMPDecl->getLocation(), + diag::note_property_impl_required); + } + } + + llvm::DenseSet<Selector> ClsMap; + for (ObjCImplementationDecl::classmeth_iterator + I = IMPDecl->classmeth_begin(Context), + E = IMPDecl->classmeth_end(Context); I != E; ++I) + ClsMap.insert((*I)->getSelector()); + + // Check for type conflict of methods declared in a class/protocol and + // its implementation; if any. + llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; + MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, + IMPDecl, CDecl, + IncompleteImpl, true); + + // Check the protocol list for unimplemented methods in the @implementation + // class. + // Check and see if class methods in class interface have been + // implemented in the implementation class. + + if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { + for (ObjCInterfaceDecl::protocol_iterator PI = I->protocol_begin(), + E = I->protocol_end(); PI != E; ++PI) + CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, + InsMap, ClsMap, I); + // Check class extensions (unnamed categories) + for (ObjCCategoryDecl *Categories = I->getCategoryList(); + Categories; Categories = Categories->getNextClassCategory()) { + if (!Categories->getIdentifier()) { + ImplMethodsVsClassMethods(IMPDecl, Categories, IncompleteImpl); + break; + } + } + } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { + for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), + E = C->protocol_end(); PI != E; ++PI) + CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, + InsMap, ClsMap, C->getClassInterface()); + } else + assert(false && "invalid ObjCContainerDecl type."); +} + +/// ActOnForwardClassDeclaration - +Action::DeclPtrTy +Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, + IdentifierInfo **IdentList, + unsigned NumElts) { + llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces; + + for (unsigned i = 0; i != NumElts; ++i) { + // Check for another declaration kind with the same name. + NamedDecl *PrevDecl = LookupName(TUScope, IdentList[i], LookupOrdinaryName); + if (PrevDecl && PrevDecl->isTemplateParameter()) { + // Maybe we will complain about the shadowed template parameter. + DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); + // Just pretend that we didn't see the previous declaration. + PrevDecl = 0; + } + + if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { + // GCC apparently allows the following idiom: + // + // typedef NSObject < XCElementTogglerP > XCElementToggler; + // @class XCElementToggler; + // + // FIXME: Make an extension? + TypedefDecl *TDD = dyn_cast<TypedefDecl>(PrevDecl); + if (!TDD || !isa<ObjCInterfaceType>(TDD->getUnderlyingType())) { + Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; + Diag(PrevDecl->getLocation(), diag::note_previous_definition); + } + else if (TDD) { + // a forward class declaration matching a typedef name of a class + // refers to the underlying class. + if (ObjCInterfaceType * OI = + dyn_cast<ObjCInterfaceType>(TDD->getUnderlyingType())) + PrevDecl = OI->getDecl(); + } + } + ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); + if (!IDecl) { // Not already seen? Make a forward decl. + IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, + IdentList[i], SourceLocation(), true); + PushOnScopeChains(IDecl, TUScope); + } + + Interfaces.push_back(IDecl); + } + + ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc, + &Interfaces[0], + Interfaces.size()); + CurContext->addDecl(Context, CDecl); + CheckObjCDeclScope(CDecl); + return DeclPtrTy::make(CDecl); +} + + +/// MatchTwoMethodDeclarations - Checks that two methods have matching type and +/// returns true, or false, accordingly. +/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons +bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method, + const ObjCMethodDecl *PrevMethod, + bool matchBasedOnSizeAndAlignment) { + QualType T1 = Context.getCanonicalType(Method->getResultType()); + QualType T2 = Context.getCanonicalType(PrevMethod->getResultType()); + + if (T1 != T2) { + // The result types are different. + if (!matchBasedOnSizeAndAlignment) + return false; + // Incomplete types don't have a size and alignment. + if (T1->isIncompleteType() || T2->isIncompleteType()) + return false; + // Check is based on size and alignment. + if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) + return false; + } + + ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), + E = Method->param_end(); + ObjCMethodDecl::param_iterator PrevI = PrevMethod->param_begin(); + + for (; ParamI != E; ++ParamI, ++PrevI) { + assert(PrevI != PrevMethod->param_end() && "Param mismatch"); + T1 = Context.getCanonicalType((*ParamI)->getType()); + T2 = Context.getCanonicalType((*PrevI)->getType()); + if (T1 != T2) { + // The result types are different. + if (!matchBasedOnSizeAndAlignment) + return false; + // Incomplete types don't have a size and alignment. + if (T1->isIncompleteType() || T2->isIncompleteType()) + return false; + // Check is based on size and alignment. + if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) + return false; + } + } + return true; +} + +/// \brief Read the contents of the instance and factory method pools +/// for a given selector from external storage. +/// +/// This routine should only be called once, when neither the instance +/// nor the factory method pool has an entry for this selector. +Sema::MethodPool::iterator Sema::ReadMethodPool(Selector Sel, + bool isInstance) { + assert(ExternalSource && "We need an external AST source"); + assert(InstanceMethodPool.find(Sel) == InstanceMethodPool.end() && + "Selector data already loaded into the instance method pool"); + assert(FactoryMethodPool.find(Sel) == FactoryMethodPool.end() && + "Selector data already loaded into the factory method pool"); + + // Read the method list from the external source. + std::pair<ObjCMethodList, ObjCMethodList> Methods + = ExternalSource->ReadMethodPool(Sel); + + if (isInstance) { + if (Methods.second.Method) + FactoryMethodPool[Sel] = Methods.second; + return InstanceMethodPool.insert(std::make_pair(Sel, Methods.first)).first; + } + + if (Methods.first.Method) + InstanceMethodPool[Sel] = Methods.first; + + return FactoryMethodPool.insert(std::make_pair(Sel, Methods.second)).first; +} + +void Sema::AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method) { + llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos + = InstanceMethodPool.find(Method->getSelector()); + if (Pos == InstanceMethodPool.end()) { + if (ExternalSource && !FactoryMethodPool.count(Method->getSelector())) + Pos = ReadMethodPool(Method->getSelector(), /*isInstance=*/true); + else + Pos = InstanceMethodPool.insert(std::make_pair(Method->getSelector(), + ObjCMethodList())).first; + } + + ObjCMethodList &Entry = Pos->second; + if (Entry.Method == 0) { + // Haven't seen a method with this selector name yet - add it. + Entry.Method = Method; + Entry.Next = 0; + return; + } + + // We've seen a method with this name, see if we have already seen this type + // signature. + for (ObjCMethodList *List = &Entry; List; List = List->Next) + if (MatchTwoMethodDeclarations(Method, List->Method)) + return; + + // We have a new signature for an existing method - add it. + // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". + Entry.Next = new ObjCMethodList(Method, Entry.Next); +} + +// FIXME: Finish implementing -Wno-strict-selector-match. +ObjCMethodDecl *Sema::LookupInstanceMethodInGlobalPool(Selector Sel, + SourceRange R) { + llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos + = InstanceMethodPool.find(Sel); + if (Pos == InstanceMethodPool.end()) { + if (ExternalSource && !FactoryMethodPool.count(Sel)) + Pos = ReadMethodPool(Sel, /*isInstance=*/true); + else + return 0; + } + + ObjCMethodList &MethList = Pos->second; + bool issueWarning = false; + + if (MethList.Method && MethList.Next) { + for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) + // This checks if the methods differ by size & alignment. + if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) + issueWarning = true; + } + if (issueWarning && (MethList.Method && MethList.Next)) { + Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; + Diag(MethList.Method->getLocStart(), diag::note_using_decl) + << MethList.Method->getSourceRange(); + for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) + Diag(Next->Method->getLocStart(), diag::note_also_found_decl) + << Next->Method->getSourceRange(); + } + return MethList.Method; +} + +void Sema::AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method) { + llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos + = FactoryMethodPool.find(Method->getSelector()); + if (Pos == FactoryMethodPool.end()) { + if (ExternalSource && !InstanceMethodPool.count(Method->getSelector())) + Pos = ReadMethodPool(Method->getSelector(), /*isInstance=*/false); + else + Pos = FactoryMethodPool.insert(std::make_pair(Method->getSelector(), + ObjCMethodList())).first; + } + + ObjCMethodList &FirstMethod = Pos->second; + if (!FirstMethod.Method) { + // Haven't seen a method with this selector name yet - add it. + FirstMethod.Method = Method; + FirstMethod.Next = 0; + } else { + // We've seen a method with this name, now check the type signature(s). + bool match = MatchTwoMethodDeclarations(Method, FirstMethod.Method); + + for (ObjCMethodList *Next = FirstMethod.Next; !match && Next; + Next = Next->Next) + match = MatchTwoMethodDeclarations(Method, Next->Method); + + if (!match) { + // We have a new signature for an existing method - add it. + // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". + struct ObjCMethodList *OMI = new ObjCMethodList(Method, FirstMethod.Next); + FirstMethod.Next = OMI; + } + } +} + +ObjCMethodDecl *Sema::LookupFactoryMethodInGlobalPool(Selector Sel, + SourceRange R) { + llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos + = FactoryMethodPool.find(Sel); + if (Pos == FactoryMethodPool.end()) { + if (ExternalSource && !InstanceMethodPool.count(Sel)) + Pos = ReadMethodPool(Sel, /*isInstance=*/false); + else + return 0; + } + + ObjCMethodList &MethList = Pos->second; + bool issueWarning = false; + + if (MethList.Method && MethList.Next) { + for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) + // This checks if the methods differ by size & alignment. + if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) + issueWarning = true; + } + if (issueWarning && (MethList.Method && MethList.Next)) { + Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; + Diag(MethList.Method->getLocStart(), diag::note_using_decl) + << MethList.Method->getSourceRange(); + for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) + Diag(Next->Method->getLocStart(), diag::note_also_found_decl) + << Next->Method->getSourceRange(); + } + return MethList.Method; +} + +/// ProcessPropertyDecl - Make sure that any user-defined setter/getter methods +/// have the property type and issue diagnostics if they don't. +/// Also synthesize a getter/setter method if none exist (and update the +/// appropriate lookup tables. FIXME: Should reconsider if adding synthesized +/// methods is the "right" thing to do. +void Sema::ProcessPropertyDecl(ObjCPropertyDecl *property, + ObjCContainerDecl *CD) { + ObjCMethodDecl *GetterMethod, *SetterMethod; + + GetterMethod = CD->getInstanceMethod(Context, property->getGetterName()); + SetterMethod = CD->getInstanceMethod(Context, property->getSetterName()); + DiagnosePropertyAccessorMismatch(property, GetterMethod, + property->getLocation()); + + if (SetterMethod) { + if (Context.getCanonicalType(SetterMethod->getResultType()) + != Context.VoidTy) + Diag(SetterMethod->getLocation(), diag::err_setter_type_void); + if (SetterMethod->param_size() != 1 || + ((*SetterMethod->param_begin())->getType() != property->getType())) { + Diag(property->getLocation(), + diag::warn_accessor_property_type_mismatch) + << property->getDeclName() + << SetterMethod->getSelector(); + Diag(SetterMethod->getLocation(), diag::note_declared_at); + } + } + + // Synthesize getter/setter methods if none exist. + // Find the default getter and if one not found, add one. + // FIXME: The synthesized property we set here is misleading. We almost always + // synthesize these methods unless the user explicitly provided prototypes + // (which is odd, but allowed). Sema should be typechecking that the + // declarations jive in that situation (which it is not currently). + if (!GetterMethod) { + // No instance method of same name as property getter name was found. + // Declare a getter method and add it to the list of methods + // for this class. + GetterMethod = ObjCMethodDecl::Create(Context, property->getLocation(), + property->getLocation(), property->getGetterName(), + property->getType(), CD, true, false, true, + (property->getPropertyImplementation() == + ObjCPropertyDecl::Optional) ? + ObjCMethodDecl::Optional : + ObjCMethodDecl::Required); + CD->addDecl(Context, GetterMethod); + } else + // A user declared getter will be synthesize when @synthesize of + // the property with the same name is seen in the @implementation + GetterMethod->setSynthesized(true); + property->setGetterMethodDecl(GetterMethod); + + // Skip setter if property is read-only. + if (!property->isReadOnly()) { + // Find the default setter and if one not found, add one. + if (!SetterMethod) { + // No instance method of same name as property setter name was found. + // Declare a setter method and add it to the list of methods + // for this class. + SetterMethod = ObjCMethodDecl::Create(Context, property->getLocation(), + property->getLocation(), + property->getSetterName(), + Context.VoidTy, CD, true, false, true, + (property->getPropertyImplementation() == + ObjCPropertyDecl::Optional) ? + ObjCMethodDecl::Optional : + ObjCMethodDecl::Required); + // Invent the arguments for the setter. We don't bother making a + // nice name for the argument. + ParmVarDecl *Argument = ParmVarDecl::Create(Context, SetterMethod, + property->getLocation(), + property->getIdentifier(), + property->getType(), + VarDecl::None, + 0); + SetterMethod->setMethodParams(Context, &Argument, 1); + CD->addDecl(Context, SetterMethod); + } else + // A user declared setter will be synthesize when @synthesize of + // the property with the same name is seen in the @implementation + SetterMethod->setSynthesized(true); + property->setSetterMethodDecl(SetterMethod); + } + // Add any synthesized methods to the global pool. This allows us to + // handle the following, which is supported by GCC (and part of the design). + // + // @interface Foo + // @property double bar; + // @end + // + // void thisIsUnfortunate() { + // id foo; + // double bar = [foo bar]; + // } + // + if (GetterMethod) + AddInstanceMethodToGlobalPool(GetterMethod); + if (SetterMethod) + AddInstanceMethodToGlobalPool(SetterMethod); +} + +// Note: For class/category implemenations, allMethods/allProperties is +// always null. +void Sema::ActOnAtEnd(SourceLocation AtEndLoc, DeclPtrTy classDecl, + DeclPtrTy *allMethods, unsigned allNum, + DeclPtrTy *allProperties, unsigned pNum, + DeclGroupPtrTy *allTUVars, unsigned tuvNum) { + Decl *ClassDecl = classDecl.getAs<Decl>(); + + // FIXME: If we don't have a ClassDecl, we have an error. We should consider + // always passing in a decl. If the decl has an error, isInvalidDecl() + // should be true. + if (!ClassDecl) + return; + + bool isInterfaceDeclKind = + isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) + || isa<ObjCProtocolDecl>(ClassDecl); + bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); + + DeclContext *DC = dyn_cast<DeclContext>(ClassDecl); + + // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. + llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; + llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; + + for (unsigned i = 0; i < allNum; i++ ) { + ObjCMethodDecl *Method = + cast_or_null<ObjCMethodDecl>(allMethods[i].getAs<Decl>()); + + if (!Method) continue; // Already issued a diagnostic. + if (Method->isInstanceMethod()) { + /// Check for instance method of the same name with incompatible types + const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; + bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) + : false; + if ((isInterfaceDeclKind && PrevMethod && !match) + || (checkIdenticalMethods && match)) { + Diag(Method->getLocation(), diag::err_duplicate_method_decl) + << Method->getDeclName(); + Diag(PrevMethod->getLocation(), diag::note_previous_declaration); + } else { + DC->addDecl(Context, Method); + InsMap[Method->getSelector()] = Method; + /// The following allows us to typecheck messages to "id". + AddInstanceMethodToGlobalPool(Method); + } + } + else { + /// Check for class method of the same name with incompatible types + const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; + bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) + : false; + if ((isInterfaceDeclKind && PrevMethod && !match) + || (checkIdenticalMethods && match)) { + Diag(Method->getLocation(), diag::err_duplicate_method_decl) + << Method->getDeclName(); + Diag(PrevMethod->getLocation(), diag::note_previous_declaration); + } else { + DC->addDecl(Context, Method); + ClsMap[Method->getSelector()] = Method; + /// The following allows us to typecheck messages to "Class". + AddFactoryMethodToGlobalPool(Method); + } + } + } + if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { + // Compares properties declared in this class to those of its + // super class. + ComparePropertiesInBaseAndSuper(I); + MergeProtocolPropertiesIntoClass(I, DeclPtrTy::make(I)); + } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { + // Categories are used to extend the class by declaring new methods. + // By the same token, they are also used to add new properties. No + // need to compare the added property to those in the class. + + // Merge protocol properties into category + MergeProtocolPropertiesIntoClass(C, DeclPtrTy::make(C)); + if (C->getIdentifier() == 0) + DiagnoseClassExtensionDupMethods(C, C->getClassInterface()); + } + if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { + // ProcessPropertyDecl is responsible for diagnosing conflicts with any + // user-defined setter/getter. It also synthesizes setter/getter methods + // and adds them to the DeclContext and global method pools. + for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(Context), + E = CDecl->prop_end(Context); + I != E; ++I) + ProcessPropertyDecl(*I, CDecl); + CDecl->setAtEndLoc(AtEndLoc); + } + if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { + IC->setLocEnd(AtEndLoc); + if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) + ImplMethodsVsClassMethods(IC, IDecl); + } else if (ObjCCategoryImplDecl* CatImplClass = + dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { + CatImplClass->setLocEnd(AtEndLoc); + + // Find category interface decl and then check that all methods declared + // in this interface are implemented in the category @implementation. + if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { + for (ObjCCategoryDecl *Categories = IDecl->getCategoryList(); + Categories; Categories = Categories->getNextClassCategory()) { + if (Categories->getIdentifier() == CatImplClass->getIdentifier()) { + ImplMethodsVsClassMethods(CatImplClass, Categories); + break; + } + } + } + } + if (isInterfaceDeclKind) { + // Reject invalid vardecls. + for (unsigned i = 0; i != tuvNum; i++) { + DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); + for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) + if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { + if (!VDecl->hasExternalStorage()) + Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); + } + } + } +} + + +/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for +/// objective-c's type qualifier from the parser version of the same info. +static Decl::ObjCDeclQualifier +CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { + Decl::ObjCDeclQualifier ret = Decl::OBJC_TQ_None; + if (PQTVal & ObjCDeclSpec::DQ_In) + ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_In); + if (PQTVal & ObjCDeclSpec::DQ_Inout) + ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Inout); + if (PQTVal & ObjCDeclSpec::DQ_Out) + ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Out); + if (PQTVal & ObjCDeclSpec::DQ_Bycopy) + ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Bycopy); + if (PQTVal & ObjCDeclSpec::DQ_Byref) + ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Byref); + if (PQTVal & ObjCDeclSpec::DQ_Oneway) + ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Oneway); + + return ret; +} + +Sema::DeclPtrTy Sema::ActOnMethodDeclaration( + SourceLocation MethodLoc, SourceLocation EndLoc, + tok::TokenKind MethodType, DeclPtrTy classDecl, + ObjCDeclSpec &ReturnQT, TypeTy *ReturnType, + Selector Sel, + // optional arguments. The number of types/arguments is obtained + // from the Sel.getNumArgs(). + ObjCArgInfo *ArgInfo, + llvm::SmallVectorImpl<Declarator> &Cdecls, + AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, + bool isVariadic) { + Decl *ClassDecl = classDecl.getAs<Decl>(); + + // Make sure we can establish a context for the method. + if (!ClassDecl) { + Diag(MethodLoc, diag::error_missing_method_context); + return DeclPtrTy(); + } + QualType resultDeclType; + + if (ReturnType) { + resultDeclType = QualType::getFromOpaquePtr(ReturnType); + + // Methods cannot return interface types. All ObjC objects are + // passed by reference. + if (resultDeclType->isObjCInterfaceType()) { + Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) + << 0 << resultDeclType; + return DeclPtrTy(); + } + } else // get the type for "id". + resultDeclType = Context.getObjCIdType(); + + ObjCMethodDecl* ObjCMethod = + ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType, + cast<DeclContext>(ClassDecl), + MethodType == tok::minus, isVariadic, + false, + MethodDeclKind == tok::objc_optional ? + ObjCMethodDecl::Optional : + ObjCMethodDecl::Required); + + llvm::SmallVector<ParmVarDecl*, 16> Params; + + for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { + QualType ArgType, UnpromotedArgType; + + if (ArgInfo[i].Type == 0) { + UnpromotedArgType = ArgType = Context.getObjCIdType(); + } else { + UnpromotedArgType = ArgType = QualType::getFromOpaquePtr(ArgInfo[i].Type); + // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). + ArgType = adjustParameterType(ArgType); + } + + ParmVarDecl* Param; + if (ArgType == UnpromotedArgType) + Param = ParmVarDecl::Create(Context, ObjCMethod, ArgInfo[i].NameLoc, + ArgInfo[i].Name, ArgType, + VarDecl::None, 0); + else + Param = OriginalParmVarDecl::Create(Context, ObjCMethod, + ArgInfo[i].NameLoc, + ArgInfo[i].Name, ArgType, + UnpromotedArgType, + VarDecl::None, 0); + + if (ArgType->isObjCInterfaceType()) { + Diag(ArgInfo[i].NameLoc, + diag::err_object_cannot_be_passed_returned_by_value) + << 1 << ArgType; + Param->setInvalidDecl(); + } + + Param->setObjCDeclQualifier( + CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); + + // Apply the attributes to the parameter. + ProcessDeclAttributeList(Param, ArgInfo[i].ArgAttrs); + + Params.push_back(Param); + } + + ObjCMethod->setMethodParams(Context, Params.data(), Sel.getNumArgs()); + ObjCMethod->setObjCDeclQualifier( + CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); + const ObjCMethodDecl *PrevMethod = 0; + + if (AttrList) + ProcessDeclAttributeList(ObjCMethod, AttrList); + + // For implementations (which can be very "coarse grain"), we add the + // method now. This allows the AST to implement lookup methods that work + // incrementally (without waiting until we parse the @end). It also allows + // us to flag multiple declaration errors as they occur. + if (ObjCImplementationDecl *ImpDecl = + dyn_cast<ObjCImplementationDecl>(ClassDecl)) { + if (MethodType == tok::minus) { + PrevMethod = ImpDecl->getInstanceMethod(Context, Sel); + ImpDecl->addInstanceMethod(Context, ObjCMethod); + } else { + PrevMethod = ImpDecl->getClassMethod(Context, Sel); + ImpDecl->addClassMethod(Context, ObjCMethod); + } + if (AttrList) + Diag(EndLoc, diag::warn_attribute_method_def); + } + else if (ObjCCategoryImplDecl *CatImpDecl = + dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { + if (MethodType == tok::minus) { + PrevMethod = CatImpDecl->getInstanceMethod(Context, Sel); + CatImpDecl->addInstanceMethod(Context, ObjCMethod); + } else { + PrevMethod = CatImpDecl->getClassMethod(Context, Sel); + CatImpDecl->addClassMethod(Context, ObjCMethod); + } + if (AttrList) + Diag(EndLoc, diag::warn_attribute_method_def); + } + if (PrevMethod) { + // You can never have two method definitions with the same name. + Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) + << ObjCMethod->getDeclName(); + Diag(PrevMethod->getLocation(), diag::note_previous_declaration); + } + return DeclPtrTy::make(ObjCMethod); +} + +void Sema::CheckObjCPropertyAttributes(QualType PropertyTy, + SourceLocation Loc, + unsigned &Attributes) { + // FIXME: Improve the reported location. + + // readonly and readwrite/assign/retain/copy conflict. + if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) && + (Attributes & (ObjCDeclSpec::DQ_PR_readwrite | + ObjCDeclSpec::DQ_PR_assign | + ObjCDeclSpec::DQ_PR_copy | + ObjCDeclSpec::DQ_PR_retain))) { + const char * which = (Attributes & ObjCDeclSpec::DQ_PR_readwrite) ? + "readwrite" : + (Attributes & ObjCDeclSpec::DQ_PR_assign) ? + "assign" : + (Attributes & ObjCDeclSpec::DQ_PR_copy) ? + "copy" : "retain"; + + Diag(Loc, (Attributes & (ObjCDeclSpec::DQ_PR_readwrite)) ? + diag::err_objc_property_attr_mutually_exclusive : + diag::warn_objc_property_attr_mutually_exclusive) + << "readonly" << which; + } + + // Check for copy or retain on non-object types. + if ((Attributes & (ObjCDeclSpec::DQ_PR_copy | ObjCDeclSpec::DQ_PR_retain)) && + !Context.isObjCObjectPointerType(PropertyTy)) { + Diag(Loc, diag::err_objc_property_requires_object) + << (Attributes & ObjCDeclSpec::DQ_PR_copy ? "copy" : "retain"); + Attributes &= ~(ObjCDeclSpec::DQ_PR_copy | ObjCDeclSpec::DQ_PR_retain); + } + + // Check for more than one of { assign, copy, retain }. + if (Attributes & ObjCDeclSpec::DQ_PR_assign) { + if (Attributes & ObjCDeclSpec::DQ_PR_copy) { + Diag(Loc, diag::err_objc_property_attr_mutually_exclusive) + << "assign" << "copy"; + Attributes &= ~ObjCDeclSpec::DQ_PR_copy; + } + if (Attributes & ObjCDeclSpec::DQ_PR_retain) { + Diag(Loc, diag::err_objc_property_attr_mutually_exclusive) + << "assign" << "retain"; + Attributes &= ~ObjCDeclSpec::DQ_PR_retain; + } + } else if (Attributes & ObjCDeclSpec::DQ_PR_copy) { + if (Attributes & ObjCDeclSpec::DQ_PR_retain) { + Diag(Loc, diag::err_objc_property_attr_mutually_exclusive) + << "copy" << "retain"; + Attributes &= ~ObjCDeclSpec::DQ_PR_retain; + } + } + + // Warn if user supplied no assignment attribute, property is + // readwrite, and this is an object type. + if (!(Attributes & (ObjCDeclSpec::DQ_PR_assign | ObjCDeclSpec::DQ_PR_copy | + ObjCDeclSpec::DQ_PR_retain)) && + !(Attributes & ObjCDeclSpec::DQ_PR_readonly) && + Context.isObjCObjectPointerType(PropertyTy)) { + // Skip this warning in gc-only mode. + if (getLangOptions().getGCMode() != LangOptions::GCOnly) + Diag(Loc, diag::warn_objc_property_no_assignment_attribute); + + // If non-gc code warn that this is likely inappropriate. + if (getLangOptions().getGCMode() == LangOptions::NonGC) + Diag(Loc, diag::warn_objc_property_default_assign_on_object); + + // FIXME: Implement warning dependent on NSCopying being + // implemented. See also: + // <rdar://5168496&4855821&5607453&5096644&4947311&5698469&4947014&5168496> + // (please trim this list while you are at it). + } + + if (!(Attributes & ObjCDeclSpec::DQ_PR_copy) + && getLangOptions().getGCMode() == LangOptions::GCOnly + && PropertyTy->isBlockPointerType()) + Diag(Loc, diag::warn_objc_property_copy_missing_on_block); +} + +Sema::DeclPtrTy Sema::ActOnProperty(Scope *S, SourceLocation AtLoc, + FieldDeclarator &FD, + ObjCDeclSpec &ODS, + Selector GetterSel, + Selector SetterSel, + DeclPtrTy ClassCategory, + bool *isOverridingProperty, + tok::ObjCKeywordKind MethodImplKind) { + unsigned Attributes = ODS.getPropertyAttributes(); + bool isReadWrite = ((Attributes & ObjCDeclSpec::DQ_PR_readwrite) || + // default is readwrite! + !(Attributes & ObjCDeclSpec::DQ_PR_readonly)); + // property is defaulted to 'assign' if it is readwrite and is + // not retain or copy + bool isAssign = ((Attributes & ObjCDeclSpec::DQ_PR_assign) || + (isReadWrite && + !(Attributes & ObjCDeclSpec::DQ_PR_retain) && + !(Attributes & ObjCDeclSpec::DQ_PR_copy))); + QualType T = GetTypeForDeclarator(FD.D, S); + Decl *ClassDecl = ClassCategory.getAs<Decl>(); + ObjCInterfaceDecl *CCPrimary = 0; // continuation class's primary class + // May modify Attributes. + CheckObjCPropertyAttributes(T, AtLoc, Attributes); + if (ObjCCategoryDecl *CDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl)) + if (!CDecl->getIdentifier()) { + // This is a continuation class. property requires special + // handling. + if ((CCPrimary = CDecl->getClassInterface())) { + // Find the property in continuation class's primary class only. + ObjCPropertyDecl *PIDecl = 0; + IdentifierInfo *PropertyId = FD.D.getIdentifier(); + for (ObjCInterfaceDecl::prop_iterator + I = CCPrimary->prop_begin(Context), + E = CCPrimary->prop_end(Context); + I != E; ++I) + if ((*I)->getIdentifier() == PropertyId) { + PIDecl = *I; + break; + } + + if (PIDecl) { + // property 'PIDecl's readonly attribute will be over-ridden + // with continuation class's readwrite property attribute! + unsigned PIkind = PIDecl->getPropertyAttributes(); + if (isReadWrite && (PIkind & ObjCPropertyDecl::OBJC_PR_readonly)) { + if ((Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) != + (PIkind & ObjCPropertyDecl::OBJC_PR_nonatomic)) + Diag(AtLoc, diag::warn_property_attr_mismatch); + PIDecl->makeitReadWriteAttribute(); + if (Attributes & ObjCDeclSpec::DQ_PR_retain) + PIDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain); + if (Attributes & ObjCDeclSpec::DQ_PR_copy) + PIDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy); + PIDecl->setSetterName(SetterSel); + } + else + Diag(AtLoc, diag::err_use_continuation_class) + << CCPrimary->getDeclName(); + *isOverridingProperty = true; + // Make sure setter decl is synthesized, and added to primary + // class's list. + ProcessPropertyDecl(PIDecl, CCPrimary); + return DeclPtrTy(); + } + // No matching property found in the primary class. Just fall thru + // and add property to continuation class's primary class. + ClassDecl = CCPrimary; + } else { + Diag(CDecl->getLocation(), diag::err_continuation_class); + *isOverridingProperty = true; + return DeclPtrTy(); + } + } + + DeclContext *DC = dyn_cast<DeclContext>(ClassDecl); + assert(DC && "ClassDecl is not a DeclContext"); + ObjCPropertyDecl *PDecl = ObjCPropertyDecl::Create(Context, DC, + FD.D.getIdentifierLoc(), + FD.D.getIdentifier(), T); + DC->addDecl(Context, PDecl); + + if (T->isArrayType() || T->isFunctionType()) { + Diag(AtLoc, diag::err_property_type) << T; + PDecl->setInvalidDecl(); + } + + ProcessDeclAttributes(PDecl, FD.D); + + // Regardless of setter/getter attribute, we save the default getter/setter + // selector names in anticipation of declaration of setter/getter methods. + PDecl->setGetterName(GetterSel); + PDecl->setSetterName(SetterSel); + + if (Attributes & ObjCDeclSpec::DQ_PR_readonly) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readonly); + + if (Attributes & ObjCDeclSpec::DQ_PR_getter) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_getter); + + if (Attributes & ObjCDeclSpec::DQ_PR_setter) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_setter); + + if (isReadWrite) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readwrite); + + if (Attributes & ObjCDeclSpec::DQ_PR_retain) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain); + + if (Attributes & ObjCDeclSpec::DQ_PR_copy) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy); + + if (isAssign) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign); + + if (Attributes & ObjCDeclSpec::DQ_PR_nonatomic) + PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_nonatomic); + + if (MethodImplKind == tok::objc_required) + PDecl->setPropertyImplementation(ObjCPropertyDecl::Required); + else if (MethodImplKind == tok::objc_optional) + PDecl->setPropertyImplementation(ObjCPropertyDecl::Optional); + // A case of continuation class adding a new property in the class. This + // is not what it was meant for. However, gcc supports it and so should we. + // Make sure setter/getters are declared here. + if (CCPrimary) + ProcessPropertyDecl(PDecl, CCPrimary); + + return DeclPtrTy::make(PDecl); +} + +/// ActOnPropertyImplDecl - This routine performs semantic checks and +/// builds the AST node for a property implementation declaration; declared +/// as @synthesize or @dynamic. +/// +Sema::DeclPtrTy Sema::ActOnPropertyImplDecl(SourceLocation AtLoc, + SourceLocation PropertyLoc, + bool Synthesize, + DeclPtrTy ClassCatImpDecl, + IdentifierInfo *PropertyId, + IdentifierInfo *PropertyIvar) { + Decl *ClassImpDecl = ClassCatImpDecl.getAs<Decl>(); + // Make sure we have a context for the property implementation declaration. + if (!ClassImpDecl) { + Diag(AtLoc, diag::error_missing_property_context); + return DeclPtrTy(); + } + ObjCPropertyDecl *property = 0; + ObjCInterfaceDecl* IDecl = 0; + // Find the class or category class where this property must have + // a declaration. + ObjCImplementationDecl *IC = 0; + ObjCCategoryImplDecl* CatImplClass = 0; + if ((IC = dyn_cast<ObjCImplementationDecl>(ClassImpDecl))) { + IDecl = IC->getClassInterface(); + // We always synthesize an interface for an implementation + // without an interface decl. So, IDecl is always non-zero. + assert(IDecl && + "ActOnPropertyImplDecl - @implementation without @interface"); + + // Look for this property declaration in the @implementation's @interface + property = IDecl->FindPropertyDeclaration(Context, PropertyId); + if (!property) { + Diag(PropertyLoc, diag::error_bad_property_decl) << IDecl->getDeclName(); + return DeclPtrTy(); + } + } + else if ((CatImplClass = dyn_cast<ObjCCategoryImplDecl>(ClassImpDecl))) { + if (Synthesize) { + Diag(AtLoc, diag::error_synthesize_category_decl); + return DeclPtrTy(); + } + IDecl = CatImplClass->getClassInterface(); + if (!IDecl) { + Diag(AtLoc, diag::error_missing_property_interface); + return DeclPtrTy(); + } + ObjCCategoryDecl *Category = + IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier()); + + // If category for this implementation not found, it is an error which + // has already been reported eralier. + if (!Category) + return DeclPtrTy(); + // Look for this property declaration in @implementation's category + property = Category->FindPropertyDeclaration(Context, PropertyId); + if (!property) { + Diag(PropertyLoc, diag::error_bad_category_property_decl) + << Category->getDeclName(); + return DeclPtrTy(); + } + } else { + Diag(AtLoc, diag::error_bad_property_context); + return DeclPtrTy(); + } + ObjCIvarDecl *Ivar = 0; + // Check that we have a valid, previously declared ivar for @synthesize + if (Synthesize) { + // @synthesize + if (!PropertyIvar) + PropertyIvar = PropertyId; + QualType PropType = Context.getCanonicalType(property->getType()); + // Check that this is a previously declared 'ivar' in 'IDecl' interface + ObjCInterfaceDecl *ClassDeclared; + Ivar = IDecl->lookupInstanceVariable(Context, PropertyIvar, ClassDeclared); + if (!Ivar) { + Ivar = ObjCIvarDecl::Create(Context, CurContext, PropertyLoc, + PropertyIvar, PropType, + ObjCIvarDecl::Public, + (Expr *)0); + property->setPropertyIvarDecl(Ivar); + if (!getLangOptions().ObjCNonFragileABI) + Diag(PropertyLoc, diag::error_missing_property_ivar_decl) << PropertyId; + // Note! I deliberately want it to fall thru so, we have a + // a property implementation and to avoid future warnings. + } + else if (getLangOptions().ObjCNonFragileABI && + ClassDeclared != IDecl) { + Diag(PropertyLoc, diag::error_ivar_in_superclass_use) + << property->getDeclName() << Ivar->getDeclName() + << ClassDeclared->getDeclName(); + Diag(Ivar->getLocation(), diag::note_previous_access_declaration) + << Ivar << Ivar->getNameAsCString(); + // Note! I deliberately want it to fall thru so more errors are caught. + } + QualType IvarType = Context.getCanonicalType(Ivar->getType()); + + // Check that type of property and its ivar are type compatible. + if (PropType != IvarType) { + if (CheckAssignmentConstraints(PropType, IvarType) != Compatible) { + Diag(PropertyLoc, diag::error_property_ivar_type) + << property->getDeclName() << Ivar->getDeclName(); + // Note! I deliberately want it to fall thru so, we have a + // a property implementation and to avoid future warnings. + } + + // FIXME! Rules for properties are somewhat different that those + // for assignments. Use a new routine to consolidate all cases; + // specifically for property redeclarations as well as for ivars. + QualType lhsType =Context.getCanonicalType(PropType).getUnqualifiedType(); + QualType rhsType =Context.getCanonicalType(IvarType).getUnqualifiedType(); + if (lhsType != rhsType && + lhsType->isArithmeticType()) { + Diag(PropertyLoc, diag::error_property_ivar_type) + << property->getDeclName() << Ivar->getDeclName(); + // Fall thru - see previous comment + } + // __weak is explicit. So it works on Canonical type. + if (PropType.isObjCGCWeak() && !IvarType.isObjCGCWeak() && + getLangOptions().getGCMode() != LangOptions::NonGC) { + Diag(PropertyLoc, diag::error_weak_property) + << property->getDeclName() << Ivar->getDeclName(); + // Fall thru - see previous comment + } + if ((Context.isObjCObjectPointerType(property->getType()) || + PropType.isObjCGCStrong()) && IvarType.isObjCGCWeak() && + getLangOptions().getGCMode() != LangOptions::NonGC) { + Diag(PropertyLoc, diag::error_strong_property) + << property->getDeclName() << Ivar->getDeclName(); + // Fall thru - see previous comment + } + } + } else if (PropertyIvar) + // @dynamic + Diag(PropertyLoc, diag::error_dynamic_property_ivar_decl); + assert (property && "ActOnPropertyImplDecl - property declaration missing"); + ObjCPropertyImplDecl *PIDecl = + ObjCPropertyImplDecl::Create(Context, CurContext, AtLoc, PropertyLoc, + property, + (Synthesize ? + ObjCPropertyImplDecl::Synthesize + : ObjCPropertyImplDecl::Dynamic), + Ivar); + if (IC) { + if (Synthesize) + if (ObjCPropertyImplDecl *PPIDecl = + IC->FindPropertyImplIvarDecl(Context, PropertyIvar)) { + Diag(PropertyLoc, diag::error_duplicate_ivar_use) + << PropertyId << PPIDecl->getPropertyDecl()->getIdentifier() + << PropertyIvar; + Diag(PPIDecl->getLocation(), diag::note_previous_use); + } + + if (ObjCPropertyImplDecl *PPIDecl + = IC->FindPropertyImplDecl(Context, PropertyId)) { + Diag(PropertyLoc, diag::error_property_implemented) << PropertyId; + Diag(PPIDecl->getLocation(), diag::note_previous_declaration); + return DeclPtrTy(); + } + IC->addPropertyImplementation(Context, PIDecl); + } + else { + if (Synthesize) + if (ObjCPropertyImplDecl *PPIDecl = + CatImplClass->FindPropertyImplIvarDecl(Context, PropertyIvar)) { + Diag(PropertyLoc, diag::error_duplicate_ivar_use) + << PropertyId << PPIDecl->getPropertyDecl()->getIdentifier() + << PropertyIvar; + Diag(PPIDecl->getLocation(), diag::note_previous_use); + } + + if (ObjCPropertyImplDecl *PPIDecl = + CatImplClass->FindPropertyImplDecl(Context, PropertyId)) { + Diag(PropertyLoc, diag::error_property_implemented) << PropertyId; + Diag(PPIDecl->getLocation(), diag::note_previous_declaration); + return DeclPtrTy(); + } + CatImplClass->addPropertyImplementation(Context, PIDecl); + } + + return DeclPtrTy::make(PIDecl); +} + +bool Sema::CheckObjCDeclScope(Decl *D) { + if (isa<TranslationUnitDecl>(CurContext->getLookupContext())) + return false; + + Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); + D->setInvalidDecl(); + + return true; +} + +/// Collect the instance variables declared in an Objective-C object. Used in +/// the creation of structures from objects using the @defs directive. +/// FIXME: This should be consolidated with CollectObjCIvars as it is also +/// part of the AST generation logic of @defs. +static void CollectIvars(ObjCInterfaceDecl *Class, RecordDecl *Record, + ASTContext& Ctx, + llvm::SmallVectorImpl<Sema::DeclPtrTy> &ivars) { + if (Class->getSuperClass()) + CollectIvars(Class->getSuperClass(), Record, Ctx, ivars); + + // For each ivar, create a fresh ObjCAtDefsFieldDecl. + for (ObjCInterfaceDecl::ivar_iterator I = Class->ivar_begin(), + E = Class->ivar_end(); I != E; ++I) { + ObjCIvarDecl* ID = *I; + Decl *FD = ObjCAtDefsFieldDecl::Create(Ctx, Record, ID->getLocation(), + ID->getIdentifier(), ID->getType(), + ID->getBitWidth()); + ivars.push_back(Sema::DeclPtrTy::make(FD)); + } +} + +/// Called whenever @defs(ClassName) is encountered in the source. Inserts the +/// instance variables of ClassName into Decls. +void Sema::ActOnDefs(Scope *S, DeclPtrTy TagD, SourceLocation DeclStart, + IdentifierInfo *ClassName, + llvm::SmallVectorImpl<DeclPtrTy> &Decls) { + // Check that ClassName is a valid class + ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName); + if (!Class) { + Diag(DeclStart, diag::err_undef_interface) << ClassName; + return; + } + if (LangOpts.ObjCNonFragileABI) { + Diag(DeclStart, diag::err_atdef_nonfragile_interface); + return; + } + + // Collect the instance variables + CollectIvars(Class, dyn_cast<RecordDecl>(TagD.getAs<Decl>()), Context, Decls); + + // Introduce all of these fields into the appropriate scope. + for (llvm::SmallVectorImpl<DeclPtrTy>::iterator D = Decls.begin(); + D != Decls.end(); ++D) { + FieldDecl *FD = cast<FieldDecl>(D->getAs<Decl>()); + if (getLangOptions().CPlusPlus) + PushOnScopeChains(cast<FieldDecl>(FD), S); + else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD.getAs<Decl>())) + Record->addDecl(Context, FD); + } +} + |