| //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===// |
| // |
| // 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 expressions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Sema/SemaInternal.h" |
| #include "clang/Sema/Lookup.h" |
| #include "clang/Sema/Scope.h" |
| #include "clang/Sema/Initialization.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/ExprObjC.h" |
| #include "clang/AST/TypeLoc.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "clang/Lex/Preprocessor.h" |
| |
| using namespace clang; |
| |
| ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs, |
| Expr **strings, |
| unsigned NumStrings) { |
| StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings); |
| |
| // Most ObjC strings are formed out of a single piece. However, we *can* |
| // have strings formed out of multiple @ strings with multiple pptokens in |
| // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one |
| // StringLiteral for ObjCStringLiteral to hold onto. |
| StringLiteral *S = Strings[0]; |
| |
| // If we have a multi-part string, merge it all together. |
| if (NumStrings != 1) { |
| // Concatenate objc strings. |
| llvm::SmallString<128> StrBuf; |
| llvm::SmallVector<SourceLocation, 8> StrLocs; |
| |
| for (unsigned i = 0; i != NumStrings; ++i) { |
| S = Strings[i]; |
| |
| // ObjC strings can't be wide. |
| if (S->isWide()) { |
| Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant) |
| << S->getSourceRange(); |
| return true; |
| } |
| |
| // Append the string. |
| StrBuf += S->getString(); |
| |
| // Get the locations of the string tokens. |
| StrLocs.append(S->tokloc_begin(), S->tokloc_end()); |
| } |
| |
| // Create the aggregate string with the appropriate content and location |
| // information. |
| S = StringLiteral::Create(Context, &StrBuf[0], StrBuf.size(), false, |
| Context.getPointerType(Context.CharTy), |
| &StrLocs[0], StrLocs.size()); |
| } |
| |
| // Verify that this composite string is acceptable for ObjC strings. |
| if (CheckObjCString(S)) |
| return true; |
| |
| // Initialize the constant string interface lazily. This assumes |
| // the NSString interface is seen in this translation unit. Note: We |
| // don't use NSConstantString, since the runtime team considers this |
| // interface private (even though it appears in the header files). |
| QualType Ty = Context.getObjCConstantStringInterface(); |
| if (!Ty.isNull()) { |
| Ty = Context.getObjCObjectPointerType(Ty); |
| } else if (getLangOptions().NoConstantCFStrings) { |
| IdentifierInfo *NSIdent = &Context.Idents.get("NSConstantString"); |
| NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0], |
| LookupOrdinaryName); |
| if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { |
| Context.setObjCConstantStringInterface(StrIF); |
| Ty = Context.getObjCConstantStringInterface(); |
| Ty = Context.getObjCObjectPointerType(Ty); |
| } else { |
| // If there is no NSConstantString interface defined then treat this |
| // as error and recover from it. |
| Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent |
| << S->getSourceRange(); |
| Ty = Context.getObjCIdType(); |
| } |
| } else { |
| IdentifierInfo *NSIdent = &Context.Idents.get("NSString"); |
| NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0], |
| LookupOrdinaryName); |
| if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { |
| Context.setObjCConstantStringInterface(StrIF); |
| Ty = Context.getObjCConstantStringInterface(); |
| Ty = Context.getObjCObjectPointerType(Ty); |
| } else { |
| // If there is no NSString interface defined then treat constant |
| // strings as untyped objects and let the runtime figure it out later. |
| Ty = Context.getObjCIdType(); |
| } |
| } |
| |
| return new (Context) ObjCStringLiteral(S, Ty, AtLocs[0]); |
| } |
| |
| Expr *Sema::BuildObjCEncodeExpression(SourceLocation AtLoc, |
| TypeSourceInfo *EncodedTypeInfo, |
| SourceLocation RParenLoc) { |
| QualType EncodedType = EncodedTypeInfo->getType(); |
| QualType StrTy; |
| if (EncodedType->isDependentType()) |
| StrTy = Context.DependentTy; |
| else { |
| std::string Str; |
| Context.getObjCEncodingForType(EncodedType, Str); |
| |
| // The type of @encode is the same as the type of the corresponding string, |
| // which is an array type. |
| StrTy = Context.CharTy; |
| // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). |
| if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings) |
| StrTy.addConst(); |
| StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1), |
| ArrayType::Normal, 0); |
| } |
| |
| return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc); |
| } |
| |
| ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc, |
| SourceLocation EncodeLoc, |
| SourceLocation LParenLoc, |
| ParsedType ty, |
| SourceLocation RParenLoc) { |
| // FIXME: Preserve type source info ? |
| TypeSourceInfo *TInfo; |
| QualType EncodedType = GetTypeFromParser(ty, &TInfo); |
| if (!TInfo) |
| TInfo = Context.getTrivialTypeSourceInfo(EncodedType, |
| PP.getLocForEndOfToken(LParenLoc)); |
| |
| return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc); |
| } |
| |
| ExprResult Sema::ParseObjCSelectorExpression(Selector Sel, |
| SourceLocation AtLoc, |
| SourceLocation SelLoc, |
| SourceLocation LParenLoc, |
| SourceLocation RParenLoc) { |
| ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel, |
| SourceRange(LParenLoc, RParenLoc), false, false); |
| if (!Method) |
| Method = LookupFactoryMethodInGlobalPool(Sel, |
| SourceRange(LParenLoc, RParenLoc)); |
| if (!Method) |
| Diag(SelLoc, diag::warn_undeclared_selector) << Sel; |
| |
| llvm::DenseMap<Selector, SourceLocation>::iterator Pos |
| = ReferencedSelectors.find(Sel); |
| if (Pos == ReferencedSelectors.end()) |
| ReferencedSelectors.insert(std::make_pair(Sel, SelLoc)); |
| |
| QualType Ty = Context.getObjCSelType(); |
| return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc); |
| } |
| |
| ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId, |
| SourceLocation AtLoc, |
| SourceLocation ProtoLoc, |
| SourceLocation LParenLoc, |
| SourceLocation RParenLoc) { |
| ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoLoc); |
| if (!PDecl) { |
| Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId; |
| return true; |
| } |
| |
| QualType Ty = Context.getObjCProtoType(); |
| if (Ty.isNull()) |
| return true; |
| Ty = Context.getObjCObjectPointerType(Ty); |
| return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, RParenLoc); |
| } |
| |
| bool Sema::CheckMessageArgumentTypes(Expr **Args, unsigned NumArgs, |
| Selector Sel, ObjCMethodDecl *Method, |
| bool isClassMessage, |
| SourceLocation lbrac, SourceLocation rbrac, |
| QualType &ReturnType) { |
| if (!Method) { |
| // Apply default argument promotion as for (C99 6.5.2.2p6). |
| for (unsigned i = 0; i != NumArgs; i++) { |
| if (Args[i]->isTypeDependent()) |
| continue; |
| |
| DefaultArgumentPromotion(Args[i]); |
| } |
| |
| unsigned DiagID = isClassMessage ? diag::warn_class_method_not_found : |
| diag::warn_inst_method_not_found; |
| Diag(lbrac, DiagID) |
| << Sel << isClassMessage << SourceRange(lbrac, rbrac); |
| ReturnType = Context.getObjCIdType(); |
| return false; |
| } |
| |
| ReturnType = Method->getSendResultType(); |
| |
| unsigned NumNamedArgs = Sel.getNumArgs(); |
| // Method might have more arguments than selector indicates. This is due |
| // to addition of c-style arguments in method. |
| if (Method->param_size() > Sel.getNumArgs()) |
| NumNamedArgs = Method->param_size(); |
| // FIXME. This need be cleaned up. |
| if (NumArgs < NumNamedArgs) { |
| Diag(lbrac, diag::err_typecheck_call_too_few_args) << 2 |
| << NumNamedArgs << NumArgs; |
| return false; |
| } |
| |
| bool IsError = false; |
| for (unsigned i = 0; i < NumNamedArgs; i++) { |
| // We can't do any type-checking on a type-dependent argument. |
| if (Args[i]->isTypeDependent()) |
| continue; |
| |
| Expr *argExpr = Args[i]; |
| |
| ParmVarDecl *Param = Method->param_begin()[i]; |
| assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); |
| |
| if (RequireCompleteType(argExpr->getSourceRange().getBegin(), |
| Param->getType(), |
| PDiag(diag::err_call_incomplete_argument) |
| << argExpr->getSourceRange())) |
| return true; |
| |
| InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); |
| ExprResult ArgE = PerformCopyInitialization(Entity, |
| SourceLocation(), |
| Owned(argExpr->Retain())); |
| if (ArgE.isInvalid()) |
| IsError = true; |
| else |
| Args[i] = ArgE.takeAs<Expr>(); |
| } |
| |
| // Promote additional arguments to variadic methods. |
| if (Method->isVariadic()) { |
| for (unsigned i = NumNamedArgs; i < NumArgs; ++i) { |
| if (Args[i]->isTypeDependent()) |
| continue; |
| |
| IsError |= DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 0); |
| } |
| } else { |
| // Check for extra arguments to non-variadic methods. |
| if (NumArgs != NumNamedArgs) { |
| Diag(Args[NumNamedArgs]->getLocStart(), |
| diag::err_typecheck_call_too_many_args) |
| << 2 /*method*/ << NumNamedArgs << NumArgs |
| << Method->getSourceRange() |
| << SourceRange(Args[NumNamedArgs]->getLocStart(), |
| Args[NumArgs-1]->getLocEnd()); |
| } |
| } |
| |
| DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs); |
| return IsError; |
| } |
| |
| bool Sema::isSelfExpr(Expr *RExpr) { |
| if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(RExpr)) |
| if (DRE->getDecl()->getIdentifier() == &Context.Idents.get("self")) |
| return true; |
| return false; |
| } |
| |
| // Helper method for ActOnClassMethod/ActOnInstanceMethod. |
| // Will search "local" class/category implementations for a method decl. |
| // If failed, then we search in class's root for an instance method. |
| // Returns 0 if no method is found. |
| ObjCMethodDecl *Sema::LookupPrivateClassMethod(Selector Sel, |
| ObjCInterfaceDecl *ClassDecl) { |
| ObjCMethodDecl *Method = 0; |
| // lookup in class and all superclasses |
| while (ClassDecl && !Method) { |
| if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) |
| Method = ImpDecl->getClassMethod(Sel); |
| |
| // Look through local category implementations associated with the class. |
| if (!Method) |
| Method = ClassDecl->getCategoryClassMethod(Sel); |
| |
| // Before we give up, check if the selector is an instance method. |
| // But only in the root. This matches gcc's behaviour and what the |
| // runtime expects. |
| if (!Method && !ClassDecl->getSuperClass()) { |
| Method = ClassDecl->lookupInstanceMethod(Sel); |
| // Look through local category implementations associated |
| // with the root class. |
| if (!Method) |
| Method = LookupPrivateInstanceMethod(Sel, ClassDecl); |
| } |
| |
| ClassDecl = ClassDecl->getSuperClass(); |
| } |
| return Method; |
| } |
| |
| ObjCMethodDecl *Sema::LookupPrivateInstanceMethod(Selector Sel, |
| ObjCInterfaceDecl *ClassDecl) { |
| ObjCMethodDecl *Method = 0; |
| while (ClassDecl && !Method) { |
| // If we have implementations in scope, check "private" methods. |
| if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) |
| Method = ImpDecl->getInstanceMethod(Sel); |
| |
| // Look through local category implementations associated with the class. |
| if (!Method) |
| Method = ClassDecl->getCategoryInstanceMethod(Sel); |
| ClassDecl = ClassDecl->getSuperClass(); |
| } |
| return Method; |
| } |
| |
| /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an |
| /// objective C interface. This is a property reference expression. |
| ExprResult Sema:: |
| HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, |
| Expr *BaseExpr, DeclarationName MemberName, |
| SourceLocation MemberLoc) { |
| const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); |
| ObjCInterfaceDecl *IFace = IFaceT->getDecl(); |
| IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); |
| |
| // Search for a declared property first. |
| if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { |
| // Check whether we can reference this property. |
| if (DiagnoseUseOfDecl(PD, MemberLoc)) |
| return ExprError(); |
| QualType ResTy = PD->getType(); |
| Selector Sel = PP.getSelectorTable().getNullarySelector(Member); |
| ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); |
| if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) |
| ResTy = Getter->getSendResultType(); |
| return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, |
| MemberLoc, BaseExpr)); |
| } |
| // Check protocols on qualified interfaces. |
| for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), |
| E = OPT->qual_end(); I != E; ++I) |
| if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { |
| // Check whether we can reference this property. |
| if (DiagnoseUseOfDecl(PD, MemberLoc)) |
| return ExprError(); |
| |
| return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), |
| MemberLoc, BaseExpr)); |
| } |
| // If that failed, look for an "implicit" property by seeing if the nullary |
| // selector is implemented. |
| |
| // FIXME: The logic for looking up nullary and unary selectors should be |
| // shared with the code in ActOnInstanceMessage. |
| |
| Selector Sel = PP.getSelectorTable().getNullarySelector(Member); |
| ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); |
| |
| // If this reference is in an @implementation, check for 'private' methods. |
| if (!Getter) |
| Getter = IFace->lookupPrivateInstanceMethod(Sel); |
| |
| // Look through local category implementations associated with the class. |
| if (!Getter) |
| Getter = IFace->getCategoryInstanceMethod(Sel); |
| if (Getter) { |
| // Check if we can reference this property. |
| if (DiagnoseUseOfDecl(Getter, MemberLoc)) |
| return ExprError(); |
| } |
| // If we found a getter then this may be a valid dot-reference, we |
| // will look for the matching setter, in case it is needed. |
| Selector SetterSel = |
| SelectorTable::constructSetterName(PP.getIdentifierTable(), |
| PP.getSelectorTable(), Member); |
| ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); |
| if (!Setter) { |
| // If this reference is in an @implementation, also check for 'private' |
| // methods. |
| Setter = IFace->lookupPrivateInstanceMethod(SetterSel); |
| } |
| // Look through local category implementations associated with the class. |
| if (!Setter) |
| Setter = IFace->getCategoryInstanceMethod(SetterSel); |
| |
| if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) |
| return ExprError(); |
| |
| if (Getter) { |
| QualType PType; |
| PType = Getter->getSendResultType(); |
| return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, |
| Setter, MemberLoc, BaseExpr)); |
| } |
| |
| // Attempt to correct for typos in property names. |
| LookupResult Res(*this, MemberName, MemberLoc, LookupOrdinaryName); |
| if (CorrectTypo(Res, 0, 0, IFace, false, CTC_NoKeywords, OPT) && |
| Res.getAsSingle<ObjCPropertyDecl>()) { |
| DeclarationName TypoResult = Res.getLookupName(); |
| Diag(MemberLoc, diag::err_property_not_found_suggest) |
| << MemberName << QualType(OPT, 0) << TypoResult |
| << FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString()); |
| ObjCPropertyDecl *Property = Res.getAsSingle<ObjCPropertyDecl>(); |
| Diag(Property->getLocation(), diag::note_previous_decl) |
| << Property->getDeclName(); |
| return HandleExprPropertyRefExpr(OPT, BaseExpr, TypoResult, MemberLoc); |
| } |
| |
| Diag(MemberLoc, diag::err_property_not_found) |
| << MemberName << QualType(OPT, 0); |
| if (Setter && !Getter) |
| Diag(Setter->getLocation(), diag::note_getter_unavailable) |
| << MemberName << BaseExpr->getSourceRange(); |
| return ExprError(); |
| } |
| |
| |
| |
| ExprResult Sema:: |
| ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, |
| IdentifierInfo &propertyName, |
| SourceLocation receiverNameLoc, |
| SourceLocation propertyNameLoc) { |
| |
| IdentifierInfo *receiverNamePtr = &receiverName; |
| ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr, |
| receiverNameLoc); |
| if (IFace == 0) { |
| // If the "receiver" is 'super' in a method, handle it as an expression-like |
| // property reference. |
| if (ObjCMethodDecl *CurMethod = getCurMethodDecl()) |
| if (receiverNamePtr->isStr("super")) { |
| if (CurMethod->isInstanceMethod()) { |
| QualType T = |
| Context.getObjCInterfaceType(CurMethod->getClassInterface()); |
| T = Context.getObjCObjectPointerType(T); |
| Expr *SuperExpr = new (Context) ObjCSuperExpr(receiverNameLoc, T); |
| |
| return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(), |
| SuperExpr, &propertyName, |
| propertyNameLoc); |
| } |
| |
| // Otherwise, if this is a class method, try dispatching to our |
| // superclass. |
| IFace = CurMethod->getClassInterface()->getSuperClass(); |
| } |
| |
| if (IFace == 0) { |
| Diag(receiverNameLoc, diag::err_expected_ident_or_lparen); |
| return ExprError(); |
| } |
| } |
| |
| // Search for a declared property first. |
| Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName); |
| ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel); |
| |
| // If this reference is in an @implementation, check for 'private' methods. |
| if (!Getter) |
| if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) |
| if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) |
| if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) |
| Getter = ImpDecl->getClassMethod(Sel); |
| |
| if (Getter) { |
| // FIXME: refactor/share with ActOnMemberReference(). |
| // Check if we can reference this property. |
| if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) |
| return ExprError(); |
| } |
| |
| // Look for the matching setter, in case it is needed. |
| Selector SetterSel = |
| SelectorTable::constructSetterName(PP.getIdentifierTable(), |
| PP.getSelectorTable(), &propertyName); |
| |
| ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); |
| if (!Setter) { |
| // If this reference is in an @implementation, also check for 'private' |
| // methods. |
| if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) |
| if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) |
| if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) |
| Setter = ImpDecl->getClassMethod(SetterSel); |
| } |
| // Look through local category implementations associated with the class. |
| if (!Setter) |
| Setter = IFace->getCategoryClassMethod(SetterSel); |
| |
| if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) |
| return ExprError(); |
| |
| if (Getter || Setter) { |
| QualType PType; |
| |
| if (Getter) |
| PType = Getter->getSendResultType(); |
| else { |
| for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), |
| E = Setter->param_end(); PI != E; ++PI) |
| PType = (*PI)->getType(); |
| } |
| return Owned(new (Context) ObjCImplicitSetterGetterRefExpr( |
| Getter, PType, Setter, |
| propertyNameLoc, IFace, receiverNameLoc)); |
| } |
| return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) |
| << &propertyName << Context.getObjCInterfaceType(IFace)); |
| } |
| |
| Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S, |
| IdentifierInfo *Name, |
| SourceLocation NameLoc, |
| bool IsSuper, |
| bool HasTrailingDot, |
| ParsedType &ReceiverType) { |
| ReceiverType = ParsedType(); |
| |
| // If the identifier is "super" and there is no trailing dot, we're |
| // messaging super. |
| if (IsSuper && !HasTrailingDot && S->isInObjcMethodScope()) |
| return ObjCSuperMessage; |
| |
| LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); |
| LookupName(Result, S); |
| |
| switch (Result.getResultKind()) { |
| case LookupResult::NotFound: |
| // Normal name lookup didn't find anything. If we're in an |
| // Objective-C method, look for ivars. If we find one, we're done! |
| // FIXME: This is a hack. Ivar lookup should be part of normal lookup. |
| if (ObjCMethodDecl *Method = getCurMethodDecl()) { |
| ObjCInterfaceDecl *ClassDeclared; |
| if (Method->getClassInterface()->lookupInstanceVariable(Name, |
| ClassDeclared)) |
| return ObjCInstanceMessage; |
| } |
| |
| // Break out; we'll perform typo correction below. |
| break; |
| |
| case LookupResult::NotFoundInCurrentInstantiation: |
| case LookupResult::FoundOverloaded: |
| case LookupResult::FoundUnresolvedValue: |
| case LookupResult::Ambiguous: |
| Result.suppressDiagnostics(); |
| return ObjCInstanceMessage; |
| |
| case LookupResult::Found: { |
| // We found something. If it's a type, then we have a class |
| // message. Otherwise, it's an instance message. |
| NamedDecl *ND = Result.getFoundDecl(); |
| QualType T; |
| if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) |
| T = Context.getObjCInterfaceType(Class); |
| else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) |
| T = Context.getTypeDeclType(Type); |
| else |
| return ObjCInstanceMessage; |
| |
| // We have a class message, and T is the type we're |
| // messaging. Build source-location information for it. |
| TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); |
| ReceiverType = CreateParsedType(T, TSInfo); |
| return ObjCClassMessage; |
| } |
| } |
| |
| // Determine our typo-correction context. |
| CorrectTypoContext CTC = CTC_Expression; |
| if (ObjCMethodDecl *Method = getCurMethodDecl()) |
| if (Method->getClassInterface() && |
| Method->getClassInterface()->getSuperClass()) |
| CTC = CTC_ObjCMessageReceiver; |
| |
| if (DeclarationName Corrected = CorrectTypo(Result, S, 0, 0, false, CTC)) { |
| if (Result.isSingleResult()) { |
| // If we found a declaration, correct when it refers to an Objective-C |
| // class. |
| NamedDecl *ND = Result.getFoundDecl(); |
| if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) { |
| Diag(NameLoc, diag::err_unknown_receiver_suggest) |
| << Name << Result.getLookupName() |
| << FixItHint::CreateReplacement(SourceRange(NameLoc), |
| ND->getNameAsString()); |
| Diag(ND->getLocation(), diag::note_previous_decl) |
| << Corrected; |
| |
| QualType T = Context.getObjCInterfaceType(Class); |
| TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); |
| ReceiverType = CreateParsedType(T, TSInfo); |
| return ObjCClassMessage; |
| } |
| } else if (Result.empty() && Corrected.getAsIdentifierInfo() && |
| Corrected.getAsIdentifierInfo()->isStr("super")) { |
| // If we've found the keyword "super", this is a send to super. |
| Diag(NameLoc, diag::err_unknown_receiver_suggest) |
| << Name << Corrected |
| << FixItHint::CreateReplacement(SourceRange(NameLoc), "super"); |
| Name = Corrected.getAsIdentifierInfo(); |
| return ObjCSuperMessage; |
| } |
| } |
| |
| // Fall back: let the parser try to parse it as an instance message. |
| return ObjCInstanceMessage; |
| } |
| |
| ExprResult Sema::ActOnSuperMessage(Scope *S, |
| SourceLocation SuperLoc, |
| Selector Sel, |
| SourceLocation LBracLoc, |
| SourceLocation SelectorLoc, |
| SourceLocation RBracLoc, |
| MultiExprArg Args) { |
| // Determine whether we are inside a method or not. |
| ObjCMethodDecl *Method = getCurMethodDecl(); |
| if (!Method) { |
| Diag(SuperLoc, diag::err_invalid_receiver_to_message_super); |
| return ExprError(); |
| } |
| |
| ObjCInterfaceDecl *Class = Method->getClassInterface(); |
| if (!Class) { |
| Diag(SuperLoc, diag::error_no_super_class_message) |
| << Method->getDeclName(); |
| return ExprError(); |
| } |
| |
| ObjCInterfaceDecl *Super = Class->getSuperClass(); |
| if (!Super) { |
| // The current class does not have a superclass. |
| Diag(SuperLoc, diag::error_no_super_class) << Class->getIdentifier(); |
| return ExprError(); |
| } |
| |
| // We are in a method whose class has a superclass, so 'super' |
| // is acting as a keyword. |
| if (Method->isInstanceMethod()) { |
| // Since we are in an instance method, this is an instance |
| // message to the superclass instance. |
| QualType SuperTy = Context.getObjCInterfaceType(Super); |
| SuperTy = Context.getObjCObjectPointerType(SuperTy); |
| return BuildInstanceMessage(0, SuperTy, SuperLoc, |
| Sel, /*Method=*/0, LBracLoc, RBracLoc, |
| move(Args)); |
| } |
| |
| // Since we are in a class method, this is a class message to |
| // the superclass. |
| return BuildClassMessage(/*ReceiverTypeInfo=*/0, |
| Context.getObjCInterfaceType(Super), |
| SuperLoc, Sel, /*Method=*/0, LBracLoc, RBracLoc, |
| move(Args)); |
| } |
| |
| /// \brief Build an Objective-C class message expression. |
| /// |
| /// This routine takes care of both normal class messages and |
| /// class messages to the superclass. |
| /// |
| /// \param ReceiverTypeInfo Type source information that describes the |
| /// receiver of this message. This may be NULL, in which case we are |
| /// sending to the superclass and \p SuperLoc must be a valid source |
| /// location. |
| |
| /// \param ReceiverType The type of the object receiving the |
| /// message. When \p ReceiverTypeInfo is non-NULL, this is the same |
| /// type as that refers to. For a superclass send, this is the type of |
| /// the superclass. |
| /// |
| /// \param SuperLoc The location of the "super" keyword in a |
| /// superclass message. |
| /// |
| /// \param Sel The selector to which the message is being sent. |
| /// |
| /// \param Method The method that this class message is invoking, if |
| /// already known. |
| /// |
| /// \param LBracLoc The location of the opening square bracket ']'. |
| /// |
| /// \param RBrac The location of the closing square bracket ']'. |
| /// |
| /// \param Args The message arguments. |
| ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, |
| QualType ReceiverType, |
| SourceLocation SuperLoc, |
| Selector Sel, |
| ObjCMethodDecl *Method, |
| SourceLocation LBracLoc, |
| SourceLocation RBracLoc, |
| MultiExprArg ArgsIn) { |
| if (ReceiverType->isDependentType()) { |
| // If the receiver type is dependent, we can't type-check anything |
| // at this point. Build a dependent expression. |
| unsigned NumArgs = ArgsIn.size(); |
| Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); |
| assert(SuperLoc.isInvalid() && "Message to super with dependent type"); |
| return Owned(ObjCMessageExpr::Create(Context, ReceiverType, LBracLoc, |
| ReceiverTypeInfo, Sel, /*Method=*/0, |
| Args, NumArgs, RBracLoc)); |
| } |
| |
| SourceLocation Loc = SuperLoc.isValid()? SuperLoc |
| : ReceiverTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
| |
| // Find the class to which we are sending this message. |
| ObjCInterfaceDecl *Class = 0; |
| const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>(); |
| if (!ClassType || !(Class = ClassType->getInterface())) { |
| Diag(Loc, diag::err_invalid_receiver_class_message) |
| << ReceiverType; |
| return ExprError(); |
| } |
| assert(Class && "We don't know which class we're messaging?"); |
| |
| // Find the method we are messaging. |
| if (!Method) { |
| if (Class->isForwardDecl()) { |
| // A forward class used in messaging is treated as a 'Class' |
| Diag(Loc, diag::warn_receiver_forward_class) << Class->getDeclName(); |
| Method = LookupFactoryMethodInGlobalPool(Sel, |
| SourceRange(LBracLoc, RBracLoc)); |
| if (Method) |
| Diag(Method->getLocation(), diag::note_method_sent_forward_class) |
| << Method->getDeclName(); |
| } |
| if (!Method) |
| Method = Class->lookupClassMethod(Sel); |
| |
| // If we have an implementation in scope, check "private" methods. |
| if (!Method) |
| Method = LookupPrivateClassMethod(Sel, Class); |
| |
| if (Method && DiagnoseUseOfDecl(Method, Loc)) |
| return ExprError(); |
| } |
| |
| // Check the argument types and determine the result type. |
| QualType ReturnType; |
| unsigned NumArgs = ArgsIn.size(); |
| Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); |
| if (CheckMessageArgumentTypes(Args, NumArgs, Sel, Method, true, |
| LBracLoc, RBracLoc, ReturnType)) |
| return ExprError(); |
| |
| // Construct the appropriate ObjCMessageExpr. |
| Expr *Result; |
| if (SuperLoc.isValid()) |
| Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc, |
| SuperLoc, /*IsInstanceSuper=*/false, |
| ReceiverType, Sel, Method, Args, |
| NumArgs, RBracLoc); |
| else |
| Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc, |
| ReceiverTypeInfo, Sel, Method, Args, |
| NumArgs, RBracLoc); |
| return MaybeBindToTemporary(Result); |
| } |
| |
| // ActOnClassMessage - used for both unary and keyword messages. |
| // ArgExprs is optional - if it is present, the number of expressions |
| // is obtained from Sel.getNumArgs(). |
| ExprResult Sema::ActOnClassMessage(Scope *S, |
| ParsedType Receiver, |
| Selector Sel, |
| SourceLocation LBracLoc, |
| SourceLocation SelectorLoc, |
| SourceLocation RBracLoc, |
| MultiExprArg Args) { |
| TypeSourceInfo *ReceiverTypeInfo; |
| QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo); |
| if (ReceiverType.isNull()) |
| return ExprError(); |
| |
| |
| if (!ReceiverTypeInfo) |
| ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc); |
| |
| return BuildClassMessage(ReceiverTypeInfo, ReceiverType, |
| /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, |
| LBracLoc, RBracLoc, move(Args)); |
| } |
| |
| /// \brief Build an Objective-C instance message expression. |
| /// |
| /// This routine takes care of both normal instance messages and |
| /// instance messages to the superclass instance. |
| /// |
| /// \param Receiver The expression that computes the object that will |
| /// receive this message. This may be empty, in which case we are |
| /// sending to the superclass instance and \p SuperLoc must be a valid |
| /// source location. |
| /// |
| /// \param ReceiverType The (static) type of the object receiving the |
| /// message. When a \p Receiver expression is provided, this is the |
| /// same type as that expression. For a superclass instance send, this |
| /// is a pointer to the type of the superclass. |
| /// |
| /// \param SuperLoc The location of the "super" keyword in a |
| /// superclass instance message. |
| /// |
| /// \param Sel The selector to which the message is being sent. |
| /// |
| /// \param Method The method that this instance message is invoking, if |
| /// already known. |
| /// |
| /// \param LBracLoc The location of the opening square bracket ']'. |
| /// |
| /// \param RBrac The location of the closing square bracket ']'. |
| /// |
| /// \param Args The message arguments. |
| ExprResult Sema::BuildInstanceMessage(Expr *Receiver, |
| QualType ReceiverType, |
| SourceLocation SuperLoc, |
| Selector Sel, |
| ObjCMethodDecl *Method, |
| SourceLocation LBracLoc, |
| SourceLocation RBracLoc, |
| MultiExprArg ArgsIn) { |
| // If we have a receiver expression, perform appropriate promotions |
| // and determine receiver type. |
| if (Receiver) { |
| if (Receiver->isTypeDependent()) { |
| // If the receiver is type-dependent, we can't type-check anything |
| // at this point. Build a dependent expression. |
| unsigned NumArgs = ArgsIn.size(); |
| Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); |
| assert(SuperLoc.isInvalid() && "Message to super with dependent type"); |
| return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy, |
| LBracLoc, Receiver, Sel, |
| /*Method=*/0, Args, NumArgs, |
| RBracLoc)); |
| } |
| |
| // If necessary, apply function/array conversion to the receiver. |
| // C99 6.7.5.3p[7,8]. |
| DefaultFunctionArrayLvalueConversion(Receiver); |
| ReceiverType = Receiver->getType(); |
| } |
| |
| // The location of the receiver. |
| SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart(); |
| |
| if (!Method) { |
| // Handle messages to id. |
| bool receiverIsId = ReceiverType->isObjCIdType(); |
| if (receiverIsId || ReceiverType->isBlockPointerType() || |
| (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) { |
| Method = LookupInstanceMethodInGlobalPool(Sel, |
| SourceRange(LBracLoc, RBracLoc), |
| receiverIsId); |
| if (!Method) |
| Method = LookupFactoryMethodInGlobalPool(Sel, |
| SourceRange(LBracLoc, RBracLoc), |
| receiverIsId); |
| } else if (ReceiverType->isObjCClassType() || |
| ReceiverType->isObjCQualifiedClassType()) { |
| // Handle messages to Class. |
| if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { |
| if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { |
| // First check the public methods in the class interface. |
| Method = ClassDecl->lookupClassMethod(Sel); |
| |
| if (!Method) |
| Method = LookupPrivateClassMethod(Sel, ClassDecl); |
| |
| // FIXME: if we still haven't found a method, we need to look in |
| // protocols (if we have qualifiers). |
| } |
| if (Method && DiagnoseUseOfDecl(Method, Loc)) |
| return ExprError(); |
| } |
| if (!Method) { |
| // If not messaging 'self', look for any factory method named 'Sel'. |
| if (!Receiver || !isSelfExpr(Receiver)) { |
| Method = LookupFactoryMethodInGlobalPool(Sel, |
| SourceRange(LBracLoc, RBracLoc), |
| true); |
| if (!Method) { |
| // If no class (factory) method was found, check if an _instance_ |
| // method of the same name exists in the root class only. |
| Method = LookupInstanceMethodInGlobalPool(Sel, |
| SourceRange(LBracLoc, RBracLoc), |
| true); |
| if (Method) |
| if (const ObjCInterfaceDecl *ID = |
| dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { |
| if (ID->getSuperClass()) |
| Diag(Loc, diag::warn_root_inst_method_not_found) |
| << Sel << SourceRange(LBracLoc, RBracLoc); |
| } |
| } |
| } |
| } |
| } else { |
| ObjCInterfaceDecl* ClassDecl = 0; |
| |
| // We allow sending a message to a qualified ID ("id<foo>"), which is ok as |
| // long as one of the protocols implements the selector (if not, warn). |
| if (const ObjCObjectPointerType *QIdTy |
| = ReceiverType->getAsObjCQualifiedIdType()) { |
| // Search protocols for instance methods. |
| for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), |
| E = QIdTy->qual_end(); I != E; ++I) { |
| ObjCProtocolDecl *PDecl = *I; |
| if (PDecl && (Method = PDecl->lookupInstanceMethod(Sel))) |
| break; |
| // Since we aren't supporting "Class<foo>", look for a class method. |
| if (PDecl && (Method = PDecl->lookupClassMethod(Sel))) |
| break; |
| } |
| } else if (const ObjCObjectPointerType *OCIType |
| = ReceiverType->getAsObjCInterfacePointerType()) { |
| // We allow sending a message to a pointer to an interface (an object). |
| ClassDecl = OCIType->getInterfaceDecl(); |
| // FIXME: consider using LookupInstanceMethodInGlobalPool, since it will be |
| // faster than the following method (which can do *many* linear searches). |
| // The idea is to add class info to MethodPool. |
| Method = ClassDecl->lookupInstanceMethod(Sel); |
| |
| if (!Method) { |
| // Search protocol qualifiers. |
| for (ObjCObjectPointerType::qual_iterator QI = OCIType->qual_begin(), |
| E = OCIType->qual_end(); QI != E; ++QI) { |
| if ((Method = (*QI)->lookupInstanceMethod(Sel))) |
| break; |
| } |
| } |
| if (!Method) { |
| // If we have implementations in scope, check "private" methods. |
| Method = LookupPrivateInstanceMethod(Sel, ClassDecl); |
| |
| if (!Method && (!Receiver || !isSelfExpr(Receiver))) { |
| // If we still haven't found a method, look in the global pool. This |
| // behavior isn't very desirable, however we need it for GCC |
| // compatibility. FIXME: should we deviate?? |
| if (OCIType->qual_empty()) { |
| Method = LookupInstanceMethodInGlobalPool(Sel, |
| SourceRange(LBracLoc, RBracLoc)); |
| if (Method && !OCIType->getInterfaceDecl()->isForwardDecl()) |
| Diag(Loc, diag::warn_maynot_respond) |
| << OCIType->getInterfaceDecl()->getIdentifier() << Sel; |
| } |
| } |
| } |
| if (Method && DiagnoseUseOfDecl(Method, Loc)) |
| return ExprError(); |
| } else if (!Context.getObjCIdType().isNull() && |
| (ReceiverType->isPointerType() || |
| ReceiverType->isIntegerType())) { |
| // Implicitly convert integers and pointers to 'id' but emit a warning. |
| Diag(Loc, diag::warn_bad_receiver_type) |
| << ReceiverType |
| << Receiver->getSourceRange(); |
| if (ReceiverType->isPointerType()) |
| ImpCastExprToType(Receiver, Context.getObjCIdType(), |
| CK_BitCast); |
| else |
| ImpCastExprToType(Receiver, Context.getObjCIdType(), |
| CK_IntegralToPointer); |
| ReceiverType = Receiver->getType(); |
| } |
| else if (getLangOptions().CPlusPlus && |
| !PerformContextuallyConvertToObjCId(Receiver)) { |
| if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Receiver)) { |
| Receiver = ICE->getSubExpr(); |
| ReceiverType = Receiver->getType(); |
| } |
| return BuildInstanceMessage(Receiver, |
| ReceiverType, |
| SuperLoc, |
| Sel, |
| Method, |
| LBracLoc, |
| RBracLoc, |
| move(ArgsIn)); |
| } else { |
| // Reject other random receiver types (e.g. structs). |
| Diag(Loc, diag::err_bad_receiver_type) |
| << ReceiverType << Receiver->getSourceRange(); |
| return ExprError(); |
| } |
| } |
| } |
| |
| // Check the message arguments. |
| unsigned NumArgs = ArgsIn.size(); |
| Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); |
| QualType ReturnType; |
| if (CheckMessageArgumentTypes(Args, NumArgs, Sel, Method, false, |
| LBracLoc, RBracLoc, ReturnType)) |
| return ExprError(); |
| |
| if (!ReturnType->isVoidType()) { |
| if (RequireCompleteType(LBracLoc, ReturnType, |
| diag::err_illegal_message_expr_incomplete_type)) |
| return ExprError(); |
| } |
| |
| // Construct the appropriate ObjCMessageExpr instance. |
| Expr *Result; |
| if (SuperLoc.isValid()) |
| Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc, |
| SuperLoc, /*IsInstanceSuper=*/true, |
| ReceiverType, Sel, Method, |
| Args, NumArgs, RBracLoc); |
| else |
| Result = ObjCMessageExpr::Create(Context, ReturnType, LBracLoc, Receiver, |
| Sel, Method, Args, NumArgs, RBracLoc); |
| return MaybeBindToTemporary(Result); |
| } |
| |
| // ActOnInstanceMessage - used for both unary and keyword messages. |
| // ArgExprs is optional - if it is present, the number of expressions |
| // is obtained from Sel.getNumArgs(). |
| ExprResult Sema::ActOnInstanceMessage(Scope *S, |
| Expr *Receiver, |
| Selector Sel, |
| SourceLocation LBracLoc, |
| SourceLocation SelectorLoc, |
| SourceLocation RBracLoc, |
| MultiExprArg Args) { |
| if (!Receiver) |
| return ExprError(); |
| |
| return BuildInstanceMessage(Receiver, Receiver->getType(), |
| /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, |
| LBracLoc, RBracLoc, move(Args)); |
| } |
| |
