| //===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This provides Objective-C code generation targetting the GNU runtime. The |
| // class in this file generates structures used by the GNU Objective-C runtime |
| // library. These structures are defined in objc/objc.h and objc/objc-api.h in |
| // the GNU runtime distribution. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CGObjCRuntime.h" |
| #include "CodeGenModule.h" |
| #include "CodeGenFunction.h" |
| |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/RecordLayout.h" |
| #include "clang/AST/StmtObjC.h" |
| |
| #include "llvm/Intrinsics.h" |
| #include "llvm/Module.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Target/TargetData.h" |
| |
| #include <map> |
| |
| |
| using namespace clang; |
| using namespace CodeGen; |
| using llvm::dyn_cast; |
| |
| // The version of the runtime that this class targets. Must match the version |
| // in the runtime. |
| static const int RuntimeVersion = 8; |
| static const int NonFragileRuntimeVersion = 9; |
| static const int ProtocolVersion = 2; |
| |
| namespace { |
| class CGObjCGNU : public CodeGen::CGObjCRuntime { |
| private: |
| CodeGen::CodeGenModule &CGM; |
| llvm::Module &TheModule; |
| const llvm::PointerType *SelectorTy; |
| const llvm::PointerType *PtrToInt8Ty; |
| const llvm::FunctionType *IMPTy; |
| const llvm::PointerType *IdTy; |
| QualType ASTIdTy; |
| const llvm::IntegerType *IntTy; |
| const llvm::PointerType *PtrTy; |
| const llvm::IntegerType *LongTy; |
| const llvm::PointerType *PtrToIntTy; |
| llvm::GlobalAlias *ClassPtrAlias; |
| llvm::GlobalAlias *MetaClassPtrAlias; |
| std::vector<llvm::Constant*> Classes; |
| std::vector<llvm::Constant*> Categories; |
| std::vector<llvm::Constant*> ConstantStrings; |
| llvm::Function *LoadFunction; |
| llvm::StringMap<llvm::Constant*> ExistingProtocols; |
| typedef std::pair<std::string, std::string> TypedSelector; |
| std::map<TypedSelector, llvm::GlobalAlias*> TypedSelectors; |
| llvm::StringMap<llvm::GlobalAlias*> UntypedSelectors; |
| // Some zeros used for GEPs in lots of places. |
| llvm::Constant *Zeros[2]; |
| llvm::Constant *NULLPtr; |
| llvm::LLVMContext &VMContext; |
| private: |
| llvm::Constant *GenerateIvarList( |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets); |
| llvm::Constant *GenerateMethodList(const std::string &ClassName, |
| const std::string &CategoryName, |
| const llvm::SmallVectorImpl<Selector> &MethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes, |
| bool isClassMethodList); |
| llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName); |
| llvm::Constant *GenerateProtocolList( |
| const llvm::SmallVectorImpl<std::string> &Protocols); |
| llvm::Constant *GenerateClassStructure( |
| llvm::Constant *MetaClass, |
| llvm::Constant *SuperClass, |
| unsigned info, |
| const char *Name, |
| llvm::Constant *Version, |
| llvm::Constant *InstanceSize, |
| llvm::Constant *IVars, |
| llvm::Constant *Methods, |
| llvm::Constant *Protocols); |
| llvm::Constant *GenerateProtocolMethodList( |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes); |
| llvm::Constant *MakeConstantString(const std::string &Str, const std::string |
| &Name=""); |
| llvm::Constant *MakeGlobal(const llvm::StructType *Ty, |
| std::vector<llvm::Constant*> &V, const std::string &Name=""); |
| llvm::Constant *MakeGlobal(const llvm::ArrayType *Ty, |
| std::vector<llvm::Constant*> &V, const std::string &Name=""); |
| llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID, |
| const ObjCIvarDecl *Ivar); |
| void EmitClassRef(const std::string &className); |
| public: |
| CGObjCGNU(CodeGen::CodeGenModule &cgm); |
| virtual llvm::Constant *GenerateConstantString(const ObjCStringLiteral *); |
| virtual CodeGen::RValue |
| GenerateMessageSend(CodeGen::CodeGenFunction &CGF, |
| QualType ResultType, |
| Selector Sel, |
| llvm::Value *Receiver, |
| bool IsClassMessage, |
| const CallArgList &CallArgs, |
| const ObjCMethodDecl *Method); |
| virtual CodeGen::RValue |
| GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, |
| QualType ResultType, |
| Selector Sel, |
| const ObjCInterfaceDecl *Class, |
| bool isCategoryImpl, |
| llvm::Value *Receiver, |
| bool IsClassMessage, |
| const CallArgList &CallArgs); |
| virtual llvm::Value *GetClass(CGBuilderTy &Builder, |
| const ObjCInterfaceDecl *OID); |
| virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel); |
| virtual llvm::Value *GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl |
| *Method); |
| |
| virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, |
| const ObjCContainerDecl *CD); |
| virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); |
| virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); |
| virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, |
| const ObjCProtocolDecl *PD); |
| virtual void GenerateProtocol(const ObjCProtocolDecl *PD); |
| virtual llvm::Function *ModuleInitFunction(); |
| virtual llvm::Function *GetPropertyGetFunction(); |
| virtual llvm::Function *GetPropertySetFunction(); |
| virtual llvm::Constant *EnumerationMutationFunction(); |
| |
| virtual void EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, |
| const Stmt &S); |
| virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF, |
| const ObjCAtThrowStmt &S); |
| virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *AddrWeakObj); |
| virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst); |
| virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest); |
| virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest); |
| virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest); |
| virtual void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *DestPtr, |
| llvm::Value *SrcPtr, |
| unsigned long size); |
| virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, |
| QualType ObjectTy, |
| llvm::Value *BaseValue, |
| const ObjCIvarDecl *Ivar, |
| unsigned CVRQualifiers); |
| virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF, |
| const ObjCInterfaceDecl *Interface, |
| const ObjCIvarDecl *Ivar); |
| }; |
| } // end anonymous namespace |
| |
| |
| /// Emits a reference to a dummy variable which is emitted with each class. |
| /// This ensures that a linker error will be generated when trying to link |
| /// together modules where a referenced class is not defined. |
| void CGObjCGNU::EmitClassRef(const std::string &className) { |
| std::string symbolRef = "__objc_class_ref_" + className; |
| // Don't emit two copies of the same symbol |
| if (TheModule.getGlobalVariable(symbolRef)) |
| return; |
| std::string symbolName = "__objc_class_name_" + className; |
| llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName); |
| if (!ClassSymbol) { |
| ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false, |
| llvm::GlobalValue::ExternalLinkage, 0, symbolName); |
| } |
| new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true, |
| llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef); |
| } |
| |
| static std::string SymbolNameForClass(const std::string &ClassName) { |
| return "_OBJC_CLASS_" + ClassName; |
| } |
| |
| static std::string SymbolNameForMethod(const std::string &ClassName, const |
| std::string &CategoryName, const std::string &MethodName, bool isClassMethod) |
| { |
| return "_OBJC_METHOD_" + ClassName + "("+CategoryName+")"+ |
| (isClassMethod ? "+" : "-") + MethodName; |
| } |
| |
| CGObjCGNU::CGObjCGNU(CodeGen::CodeGenModule &cgm) |
| : CGM(cgm), TheModule(CGM.getModule()), ClassPtrAlias(0), |
| MetaClassPtrAlias(0), VMContext(cgm.getLLVMContext()) { |
| IntTy = cast<llvm::IntegerType>( |
| CGM.getTypes().ConvertType(CGM.getContext().IntTy)); |
| LongTy = cast<llvm::IntegerType>( |
| CGM.getTypes().ConvertType(CGM.getContext().LongTy)); |
| |
| Zeros[0] = llvm::ConstantInt::get(LongTy, 0); |
| Zeros[1] = Zeros[0]; |
| NULLPtr = llvm::ConstantPointerNull::get( |
| llvm::PointerType::getUnqual(llvm::Type::getInt8Ty(VMContext))); |
| // C string type. Used in lots of places. |
| PtrToInt8Ty = |
| llvm::PointerType::getUnqual(llvm::Type::getInt8Ty(VMContext)); |
| // Get the selector Type. |
| SelectorTy = cast<llvm::PointerType>( |
| CGM.getTypes().ConvertType(CGM.getContext().getObjCSelType())); |
| |
| PtrToIntTy = llvm::PointerType::getUnqual(IntTy); |
| PtrTy = PtrToInt8Ty; |
| |
| // Object type |
| ASTIdTy = CGM.getContext().getObjCIdType(); |
| IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
| |
| // IMP type |
| std::vector<const llvm::Type*> IMPArgs; |
| IMPArgs.push_back(IdTy); |
| IMPArgs.push_back(SelectorTy); |
| IMPTy = llvm::FunctionType::get(IdTy, IMPArgs, true); |
| } |
| |
| // This has to perform the lookup every time, since posing and related |
| // techniques can modify the name -> class mapping. |
| llvm::Value *CGObjCGNU::GetClass(CGBuilderTy &Builder, |
| const ObjCInterfaceDecl *OID) { |
| llvm::Value *ClassName = CGM.GetAddrOfConstantCString(OID->getNameAsString()); |
| EmitClassRef(OID->getNameAsString()); |
| ClassName = Builder.CreateStructGEP(ClassName, 0); |
| |
| std::vector<const llvm::Type*> Params(1, PtrToInt8Ty); |
| llvm::Constant *ClassLookupFn = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, |
| Params, |
| true), |
| "objc_lookup_class"); |
| return Builder.CreateCall(ClassLookupFn, ClassName); |
| } |
| |
| llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel) { |
| llvm::GlobalAlias *&US = UntypedSelectors[Sel.getAsString()]; |
| if (US == 0) |
| US = new llvm::GlobalAlias(llvm::PointerType::getUnqual(SelectorTy), |
| llvm::GlobalValue::PrivateLinkage, |
| ".objc_untyped_selector_alias"+Sel.getAsString(), |
| NULL, &TheModule); |
| |
| return Builder.CreateLoad(US); |
| } |
| |
| llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl |
| *Method) { |
| |
| std::string SelName = Method->getSelector().getAsString(); |
| std::string SelTypes; |
| CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes); |
| // Typed selectors |
| TypedSelector Selector = TypedSelector(SelName, |
| SelTypes); |
| |
| // If it's already cached, return it. |
| if (TypedSelectors[Selector]) { |
| return Builder.CreateLoad(TypedSelectors[Selector]); |
| } |
| |
| // If it isn't, cache it. |
| llvm::GlobalAlias *Sel = new llvm::GlobalAlias( |
| llvm::PointerType::getUnqual(SelectorTy), |
| llvm::GlobalValue::PrivateLinkage, ".objc_selector_alias" + SelName, |
| NULL, &TheModule); |
| TypedSelectors[Selector] = Sel; |
| |
| return Builder.CreateLoad(Sel); |
| } |
| |
| llvm::Constant *CGObjCGNU::MakeConstantString(const std::string &Str, |
| const std::string &Name) { |
| llvm::Constant * ConstStr = llvm::ConstantArray::get(VMContext, Str); |
| ConstStr = new llvm::GlobalVariable(TheModule, ConstStr->getType(), true, |
| llvm::GlobalValue::InternalLinkage, |
| ConstStr, Name); |
| return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2); |
| } |
| |
| llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::StructType *Ty, |
| std::vector<llvm::Constant*> &V, const std::string &Name) { |
| llvm::Constant *C = llvm::ConstantStruct::get(Ty, V); |
| return new llvm::GlobalVariable(TheModule, Ty, false, |
| llvm::GlobalValue::InternalLinkage, C, Name); |
| } |
| |
| llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::ArrayType *Ty, |
| std::vector<llvm::Constant*> &V, const std::string &Name) { |
| llvm::Constant *C = llvm::ConstantArray::get(Ty, V); |
| return new llvm::GlobalVariable(TheModule, Ty, false, |
| llvm::GlobalValue::InternalLinkage, C, Name); |
| } |
| |
| /// Generate an NSConstantString object. |
| //TODO: In case there are any crazy people still using the GNU runtime without |
| //an OpenStep implementation, this should let them select their own class for |
| //constant strings. |
| llvm::Constant *CGObjCGNU::GenerateConstantString(const ObjCStringLiteral *SL) { |
| std::string Str(SL->getString()->getStrData(), |
| SL->getString()->getByteLength()); |
| std::vector<llvm::Constant*> Ivars; |
| Ivars.push_back(NULLPtr); |
| Ivars.push_back(MakeConstantString(Str)); |
| Ivars.push_back(llvm::ConstantInt::get(IntTy, Str.size())); |
| llvm::Constant *ObjCStr = MakeGlobal( |
| llvm::StructType::get(VMContext, PtrToInt8Ty, PtrToInt8Ty, IntTy, NULL), |
| Ivars, ".objc_str"); |
| ConstantStrings.push_back( |
| llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty)); |
| return ObjCStr; |
| } |
| |
| ///Generates a message send where the super is the receiver. This is a message |
| ///send to self with special delivery semantics indicating which class's method |
| ///should be called. |
| CodeGen::RValue |
| CGObjCGNU::GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF, |
| QualType ResultType, |
| Selector Sel, |
| const ObjCInterfaceDecl *Class, |
| bool isCategoryImpl, |
| llvm::Value *Receiver, |
| bool IsClassMessage, |
| const CallArgList &CallArgs) { |
| llvm::Value *cmd = GetSelector(CGF.Builder, Sel); |
| |
| CallArgList ActualArgs; |
| |
| ActualArgs.push_back( |
| std::make_pair(RValue::get(CGF.Builder.CreateBitCast(Receiver, IdTy)), |
| ASTIdTy)); |
| ActualArgs.push_back(std::make_pair(RValue::get(cmd), |
| CGF.getContext().getObjCSelType())); |
| ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); |
| |
| CodeGenTypes &Types = CGM.getTypes(); |
| const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs); |
| const llvm::FunctionType *impType = Types.GetFunctionType(FnInfo, false); |
| |
| llvm::Value *ReceiverClass = 0; |
| if (isCategoryImpl) { |
| llvm::Constant *classLookupFunction = 0; |
| std::vector<const llvm::Type*> Params; |
| Params.push_back(PtrTy); |
| if (IsClassMessage) { |
| classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| IdTy, Params, true), "objc_get_meta_class"); |
| } else { |
| classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| IdTy, Params, true), "objc_get_class"); |
| } |
| ReceiverClass = CGF.Builder.CreateCall(classLookupFunction, |
| MakeConstantString(Class->getNameAsString())); |
| } else { |
| // Set up global aliases for the metaclass or class pointer if they do not |
| // already exist. These will are forward-references which will be set to |
| // pointers to the class and metaclass structure created for the runtime |
| // load function. To send a message to super, we look up the value of the |
| // super_class pointer from either the class or metaclass structure. |
| if (IsClassMessage) { |
| if (!MetaClassPtrAlias) { |
| MetaClassPtrAlias = new llvm::GlobalAlias(IdTy, |
| llvm::GlobalValue::InternalLinkage, ".objc_metaclass_ref" + |
| Class->getNameAsString(), NULL, &TheModule); |
| } |
| ReceiverClass = MetaClassPtrAlias; |
| } else { |
| if (!ClassPtrAlias) { |
| ClassPtrAlias = new llvm::GlobalAlias(IdTy, |
| llvm::GlobalValue::InternalLinkage, ".objc_class_ref" + |
| Class->getNameAsString(), NULL, &TheModule); |
| } |
| ReceiverClass = ClassPtrAlias; |
| } |
| } |
| // Cast the pointer to a simplified version of the class structure |
| ReceiverClass = CGF.Builder.CreateBitCast(ReceiverClass, |
| llvm::PointerType::getUnqual( |
| llvm::StructType::get(VMContext, IdTy, IdTy, NULL))); |
| // Get the superclass pointer |
| ReceiverClass = CGF.Builder.CreateStructGEP(ReceiverClass, 1); |
| // Load the superclass pointer |
| ReceiverClass = CGF.Builder.CreateLoad(ReceiverClass); |
| // Construct the structure used to look up the IMP |
| llvm::StructType *ObjCSuperTy = llvm::StructType::get(VMContext, |
| Receiver->getType(), IdTy, NULL); |
| llvm::Value *ObjCSuper = CGF.Builder.CreateAlloca(ObjCSuperTy); |
| |
| CGF.Builder.CreateStore(Receiver, CGF.Builder.CreateStructGEP(ObjCSuper, 0)); |
| CGF.Builder.CreateStore(ReceiverClass, |
| CGF.Builder.CreateStructGEP(ObjCSuper, 1)); |
| |
| // Get the IMP |
| std::vector<const llvm::Type*> Params; |
| Params.push_back(llvm::PointerType::getUnqual(ObjCSuperTy)); |
| Params.push_back(SelectorTy); |
| llvm::Constant *lookupFunction = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| llvm::PointerType::getUnqual(impType), Params, true), |
| "objc_msg_lookup_super"); |
| |
| llvm::Value *lookupArgs[] = {ObjCSuper, cmd}; |
| llvm::Value *imp = CGF.Builder.CreateCall(lookupFunction, lookupArgs, |
| lookupArgs+2); |
| |
| return CGF.EmitCall(FnInfo, imp, ActualArgs); |
| } |
| |
| /// Generate code for a message send expression. |
| CodeGen::RValue |
| CGObjCGNU::GenerateMessageSend(CodeGen::CodeGenFunction &CGF, |
| QualType ResultType, |
| Selector Sel, |
| llvm::Value *Receiver, |
| bool IsClassMessage, |
| const CallArgList &CallArgs, |
| const ObjCMethodDecl *Method) { |
| IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
| llvm::Value *cmd; |
| if (Method) |
| cmd = GetSelector(CGF.Builder, Method); |
| else |
| cmd = GetSelector(CGF.Builder, Sel); |
| CallArgList ActualArgs; |
| |
| ActualArgs.push_back( |
| std::make_pair(RValue::get(CGF.Builder.CreateBitCast(Receiver, IdTy)), ASTIdTy)); |
| ActualArgs.push_back(std::make_pair(RValue::get(cmd), |
| CGF.getContext().getObjCSelType())); |
| ActualArgs.insert(ActualArgs.end(), CallArgs.begin(), CallArgs.end()); |
| |
| CodeGenTypes &Types = CGM.getTypes(); |
| const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs); |
| const llvm::FunctionType *impType = Types.GetFunctionType(FnInfo, false); |
| |
| llvm::Value *imp; |
| std::vector<const llvm::Type*> Params; |
| Params.push_back(Receiver->getType()); |
| Params.push_back(SelectorTy); |
| // For sender-aware dispatch, we pass the sender as the third argument to a |
| // lookup function. When sending messages from C code, the sender is nil. |
| // objc_msg_lookup_sender(id receiver, SEL selector, id sender); |
| if (CGM.getContext().getLangOptions().ObjCSenderDispatch) { |
| llvm::Value *self; |
| |
| if (isa<ObjCMethodDecl>(CGF.CurFuncDecl)) { |
| self = CGF.LoadObjCSelf(); |
| } else { |
| self = llvm::ConstantPointerNull::get(IdTy); |
| } |
| Params.push_back(self->getType()); |
| llvm::Constant *lookupFunction = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| llvm::PointerType::getUnqual(impType), Params, true), |
| "objc_msg_lookup_sender"); |
| |
| imp = CGF.Builder.CreateCall3(lookupFunction, Receiver, cmd, self); |
| } else { |
| llvm::Constant *lookupFunction = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| llvm::PointerType::getUnqual(impType), Params, true), |
| "objc_msg_lookup"); |
| |
| imp = CGF.Builder.CreateCall2(lookupFunction, Receiver, cmd); |
| } |
| |
| return CGF.EmitCall(FnInfo, imp, ActualArgs); |
| } |
| |
| /// Generates a MethodList. Used in construction of a objc_class and |
| /// objc_category structures. |
| llvm::Constant *CGObjCGNU::GenerateMethodList(const std::string &ClassName, |
| const std::string &CategoryName, |
| const llvm::SmallVectorImpl<Selector> &MethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes, |
| bool isClassMethodList) { |
| if (MethodSels.empty()) |
| return NULLPtr; |
| // Get the method structure type. |
| llvm::StructType *ObjCMethodTy = llvm::StructType::get(VMContext, |
| PtrToInt8Ty, // Really a selector, but the runtime creates it us. |
| PtrToInt8Ty, // Method types |
| llvm::PointerType::getUnqual(IMPTy), //Method pointer |
| NULL); |
| std::vector<llvm::Constant*> Methods; |
| std::vector<llvm::Constant*> Elements; |
| for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) { |
| Elements.clear(); |
| if (llvm::Constant *Method = |
| TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName, |
| MethodSels[i].getAsString(), |
| isClassMethodList))) { |
| llvm::Constant *C = |
| CGM.GetAddrOfConstantCString(MethodSels[i].getAsString()); |
| Elements.push_back(llvm::ConstantExpr::getGetElementPtr(C, Zeros, 2)); |
| Elements.push_back( |
| llvm::ConstantExpr::getGetElementPtr(MethodTypes[i], Zeros, 2)); |
| Method = llvm::ConstantExpr::getBitCast(Method, |
| llvm::PointerType::getUnqual(IMPTy)); |
| Elements.push_back(Method); |
| Methods.push_back(llvm::ConstantStruct::get(ObjCMethodTy, Elements)); |
| } |
| } |
| |
| // Array of method structures |
| llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodTy, |
| Methods.size()); |
| llvm::Constant *MethodArray = llvm::ConstantArray::get(ObjCMethodArrayTy, |
| Methods); |
| |
| // Structure containing list pointer, array and array count |
| llvm::SmallVector<const llvm::Type*, 16> ObjCMethodListFields; |
| llvm::PATypeHolder OpaqueNextTy = llvm::OpaqueType::get(VMContext); |
| llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(OpaqueNextTy); |
| llvm::StructType *ObjCMethodListTy = llvm::StructType::get(VMContext, |
| NextPtrTy, |
| IntTy, |
| ObjCMethodArrayTy, |
| NULL); |
| // Refine next pointer type to concrete type |
| llvm::cast<llvm::OpaqueType>( |
| OpaqueNextTy.get())->refineAbstractTypeTo(ObjCMethodListTy); |
| ObjCMethodListTy = llvm::cast<llvm::StructType>(OpaqueNextTy.get()); |
| |
| Methods.clear(); |
| Methods.push_back(llvm::ConstantPointerNull::get( |
| llvm::PointerType::getUnqual(ObjCMethodListTy))); |
| Methods.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| MethodTypes.size())); |
| Methods.push_back(MethodArray); |
| |
| // Create an instance of the structure |
| return MakeGlobal(ObjCMethodListTy, Methods, ".objc_method_list"); |
| } |
| |
| /// Generates an IvarList. Used in construction of a objc_class. |
| llvm::Constant *CGObjCGNU::GenerateIvarList( |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets) { |
| // Get the method structure type. |
| llvm::StructType *ObjCIvarTy = llvm::StructType::get(VMContext, |
| PtrToInt8Ty, |
| PtrToInt8Ty, |
| IntTy, |
| NULL); |
| std::vector<llvm::Constant*> Ivars; |
| std::vector<llvm::Constant*> Elements; |
| for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) { |
| Elements.clear(); |
| Elements.push_back( llvm::ConstantExpr::getGetElementPtr(IvarNames[i], |
| Zeros, 2)); |
| Elements.push_back( llvm::ConstantExpr::getGetElementPtr(IvarTypes[i], |
| Zeros, 2)); |
| Elements.push_back(IvarOffsets[i]); |
| Ivars.push_back(llvm::ConstantStruct::get(ObjCIvarTy, Elements)); |
| } |
| |
| // Array of method structures |
| llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy, |
| IvarNames.size()); |
| |
| |
| Elements.clear(); |
| Elements.push_back(llvm::ConstantInt::get(IntTy, (int)IvarNames.size())); |
| Elements.push_back(llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars)); |
| // Structure containing array and array count |
| llvm::StructType *ObjCIvarListTy = llvm::StructType::get(VMContext, IntTy, |
| ObjCIvarArrayTy, |
| NULL); |
| |
| // Create an instance of the structure |
| return MakeGlobal(ObjCIvarListTy, Elements, ".objc_ivar_list"); |
| } |
| |
| /// Generate a class structure |
| llvm::Constant *CGObjCGNU::GenerateClassStructure( |
| llvm::Constant *MetaClass, |
| llvm::Constant *SuperClass, |
| unsigned info, |
| const char *Name, |
| llvm::Constant *Version, |
| llvm::Constant *InstanceSize, |
| llvm::Constant *IVars, |
| llvm::Constant *Methods, |
| llvm::Constant *Protocols) { |
| // Set up the class structure |
| // Note: Several of these are char*s when they should be ids. This is |
| // because the runtime performs this translation on load. |
| llvm::StructType *ClassTy = llvm::StructType::get(VMContext, |
| PtrToInt8Ty, // class_pointer |
| PtrToInt8Ty, // super_class |
| PtrToInt8Ty, // name |
| LongTy, // version |
| LongTy, // info |
| LongTy, // instance_size |
| IVars->getType(), // ivars |
| Methods->getType(), // methods |
| // These are all filled in by the runtime, so we pretend |
| PtrTy, // dtable |
| PtrTy, // subclass_list |
| PtrTy, // sibling_class |
| PtrTy, // protocols |
| PtrTy, // gc_object_type |
| NULL); |
| llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0); |
| llvm::Constant *NullP = |
| llvm::ConstantPointerNull::get(PtrTy); |
| // Fill in the structure |
| std::vector<llvm::Constant*> Elements; |
| Elements.push_back(llvm::ConstantExpr::getBitCast(MetaClass, PtrToInt8Ty)); |
| Elements.push_back(SuperClass); |
| Elements.push_back(MakeConstantString(Name, ".class_name")); |
| Elements.push_back(Zero); |
| Elements.push_back(llvm::ConstantInt::get(LongTy, info)); |
| Elements.push_back(InstanceSize); |
| Elements.push_back(IVars); |
| Elements.push_back(Methods); |
| Elements.push_back(NullP); |
| Elements.push_back(NullP); |
| Elements.push_back(NullP); |
| Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy)); |
| Elements.push_back(NullP); |
| // Create an instance of the structure |
| return MakeGlobal(ClassTy, Elements, SymbolNameForClass(Name)); |
| } |
| |
| llvm::Constant *CGObjCGNU::GenerateProtocolMethodList( |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes) { |
| // Get the method structure type. |
| llvm::StructType *ObjCMethodDescTy = llvm::StructType::get(VMContext, |
| PtrToInt8Ty, // Really a selector, but the runtime does the casting for us. |
| PtrToInt8Ty, |
| NULL); |
| std::vector<llvm::Constant*> Methods; |
| std::vector<llvm::Constant*> Elements; |
| for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) { |
| Elements.clear(); |
| Elements.push_back(llvm::ConstantExpr::getGetElementPtr(MethodNames[i], |
| Zeros, 2)); |
| Elements.push_back( |
| llvm::ConstantExpr::getGetElementPtr(MethodTypes[i], Zeros, 2)); |
| Methods.push_back(llvm::ConstantStruct::get(ObjCMethodDescTy, Elements)); |
| } |
| llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodDescTy, |
| MethodNames.size()); |
| llvm::Constant *Array = llvm::ConstantArray::get(ObjCMethodArrayTy, |
| Methods); |
| llvm::StructType *ObjCMethodDescListTy = llvm::StructType::get(VMContext, |
| IntTy, ObjCMethodArrayTy, NULL); |
| Methods.clear(); |
| Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size())); |
| Methods.push_back(Array); |
| return MakeGlobal(ObjCMethodDescListTy, Methods, ".objc_method_list"); |
| } |
| |
| // Create the protocol list structure used in classes, categories and so on |
| llvm::Constant *CGObjCGNU::GenerateProtocolList( |
| const llvm::SmallVectorImpl<std::string> &Protocols) { |
| llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty, |
| Protocols.size()); |
| llvm::StructType *ProtocolListTy = llvm::StructType::get(VMContext, |
| PtrTy, //Should be a recurisve pointer, but it's always NULL here. |
| LongTy,//FIXME: Should be size_t |
| ProtocolArrayTy, |
| NULL); |
| std::vector<llvm::Constant*> Elements; |
| for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end(); |
| iter != endIter ; iter++) { |
| llvm::Constant *protocol = ExistingProtocols[*iter]; |
| if (!protocol) |
| protocol = GenerateEmptyProtocol(*iter); |
| llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(protocol, |
| PtrToInt8Ty); |
| Elements.push_back(Ptr); |
| } |
| llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy, |
| Elements); |
| Elements.clear(); |
| Elements.push_back(NULLPtr); |
| Elements.push_back(llvm::ConstantInt::get(LongTy, Protocols.size())); |
| Elements.push_back(ProtocolArray); |
| return MakeGlobal(ProtocolListTy, Elements, ".objc_protocol_list"); |
| } |
| |
| llvm::Value *CGObjCGNU::GenerateProtocolRef(CGBuilderTy &Builder, |
| const ObjCProtocolDecl *PD) { |
| llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()]; |
| const llvm::Type *T = |
| CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType()); |
| return Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T)); |
| } |
| |
| llvm::Constant *CGObjCGNU::GenerateEmptyProtocol( |
| const std::string &ProtocolName) { |
| llvm::SmallVector<std::string, 0> EmptyStringVector; |
| llvm::SmallVector<llvm::Constant*, 0> EmptyConstantVector; |
| |
| llvm::Constant *ProtocolList = GenerateProtocolList(EmptyStringVector); |
| llvm::Constant *InstanceMethodList = |
| GenerateProtocolMethodList(EmptyConstantVector, EmptyConstantVector); |
| llvm::Constant *ClassMethodList = |
| GenerateProtocolMethodList(EmptyConstantVector, EmptyConstantVector); |
| // Protocols are objects containing lists of the methods implemented and |
| // protocols adopted. |
| llvm::StructType *ProtocolTy = llvm::StructType::get(VMContext, IdTy, |
| PtrToInt8Ty, |
| ProtocolList->getType(), |
| InstanceMethodList->getType(), |
| ClassMethodList->getType(), |
| NULL); |
| std::vector<llvm::Constant*> Elements; |
| // The isa pointer must be set to a magic number so the runtime knows it's |
| // the correct layout. |
| Elements.push_back(llvm::ConstantExpr::getIntToPtr( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), ProtocolVersion), IdTy)); |
| Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
| Elements.push_back(ProtocolList); |
| Elements.push_back(InstanceMethodList); |
| Elements.push_back(ClassMethodList); |
| return MakeGlobal(ProtocolTy, Elements, ".objc_protocol"); |
| } |
| |
| void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) { |
| ASTContext &Context = CGM.getContext(); |
| std::string ProtocolName = PD->getNameAsString(); |
| llvm::SmallVector<std::string, 16> Protocols; |
| for (ObjCProtocolDecl::protocol_iterator PI = PD->protocol_begin(), |
| E = PD->protocol_end(); PI != E; ++PI) |
| Protocols.push_back((*PI)->getNameAsString()); |
| llvm::SmallVector<llvm::Constant*, 16> InstanceMethodNames; |
| llvm::SmallVector<llvm::Constant*, 16> InstanceMethodTypes; |
| for (ObjCProtocolDecl::instmeth_iterator iter = PD->instmeth_begin(), |
| E = PD->instmeth_end(); iter != E; iter++) { |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(*iter, TypeStr); |
| InstanceMethodNames.push_back( |
| CGM.GetAddrOfConstantCString((*iter)->getSelector().getAsString())); |
| InstanceMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| // Collect information about class methods: |
| llvm::SmallVector<llvm::Constant*, 16> ClassMethodNames; |
| llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
| for (ObjCProtocolDecl::classmeth_iterator |
| iter = PD->classmeth_begin(), endIter = PD->classmeth_end(); |
| iter != endIter ; iter++) { |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl((*iter),TypeStr); |
| ClassMethodNames.push_back( |
| CGM.GetAddrOfConstantCString((*iter)->getSelector().getAsString())); |
| ClassMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| |
| llvm::Constant *ProtocolList = GenerateProtocolList(Protocols); |
| llvm::Constant *InstanceMethodList = |
| GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes); |
| llvm::Constant *ClassMethodList = |
| GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes); |
| // Protocols are objects containing lists of the methods implemented and |
| // protocols adopted. |
| llvm::StructType *ProtocolTy = llvm::StructType::get(VMContext, IdTy, |
| PtrToInt8Ty, |
| ProtocolList->getType(), |
| InstanceMethodList->getType(), |
| ClassMethodList->getType(), |
| NULL); |
| std::vector<llvm::Constant*> Elements; |
| // The isa pointer must be set to a magic number so the runtime knows it's |
| // the correct layout. |
| Elements.push_back(llvm::ConstantExpr::getIntToPtr( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), ProtocolVersion), IdTy)); |
| Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
| Elements.push_back(ProtocolList); |
| Elements.push_back(InstanceMethodList); |
| Elements.push_back(ClassMethodList); |
| ExistingProtocols[ProtocolName] = |
| llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements, |
| ".objc_protocol"), IdTy); |
| } |
| |
| void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) { |
| std::string ClassName = OCD->getClassInterface()->getNameAsString(); |
| std::string CategoryName = OCD->getNameAsString(); |
| // Collect information about instance methods |
| llvm::SmallVector<Selector, 16> InstanceMethodSels; |
| llvm::SmallVector<llvm::Constant*, 16> InstanceMethodTypes; |
| for (ObjCCategoryImplDecl::instmeth_iterator |
| iter = OCD->instmeth_begin(), endIter = OCD->instmeth_end(); |
| iter != endIter ; iter++) { |
| InstanceMethodSels.push_back((*iter)->getSelector()); |
| std::string TypeStr; |
| CGM.getContext().getObjCEncodingForMethodDecl(*iter,TypeStr); |
| InstanceMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| |
| // Collect information about class methods |
| llvm::SmallVector<Selector, 16> ClassMethodSels; |
| llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
| for (ObjCCategoryImplDecl::classmeth_iterator |
| iter = OCD->classmeth_begin(), endIter = OCD->classmeth_end(); |
| iter != endIter ; iter++) { |
| ClassMethodSels.push_back((*iter)->getSelector()); |
| std::string TypeStr; |
| CGM.getContext().getObjCEncodingForMethodDecl(*iter,TypeStr); |
| ClassMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| |
| // Collect the names of referenced protocols |
| llvm::SmallVector<std::string, 16> Protocols; |
| const ObjCInterfaceDecl *ClassDecl = OCD->getClassInterface(); |
| const ObjCList<ObjCProtocolDecl> &Protos =ClassDecl->getReferencedProtocols(); |
| for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(), |
| E = Protos.end(); I != E; ++I) |
| Protocols.push_back((*I)->getNameAsString()); |
| |
| std::vector<llvm::Constant*> Elements; |
| Elements.push_back(MakeConstantString(CategoryName)); |
| Elements.push_back(MakeConstantString(ClassName)); |
| // Instance method list |
| Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( |
| ClassName, CategoryName, InstanceMethodSels, InstanceMethodTypes, |
| false), PtrTy)); |
| // Class method list |
| Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( |
| ClassName, CategoryName, ClassMethodSels, ClassMethodTypes, true), |
| PtrTy)); |
| // Protocol list |
| Elements.push_back(llvm::ConstantExpr::getBitCast( |
| GenerateProtocolList(Protocols), PtrTy)); |
| Categories.push_back(llvm::ConstantExpr::getBitCast( |
| MakeGlobal(llvm::StructType::get(VMContext, PtrToInt8Ty, PtrToInt8Ty, |
| PtrTy, PtrTy, PtrTy, NULL), Elements), PtrTy)); |
| } |
| |
| void CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) { |
| ASTContext &Context = CGM.getContext(); |
| |
| // Get the superclass name. |
| const ObjCInterfaceDecl * SuperClassDecl = |
| OID->getClassInterface()->getSuperClass(); |
| std::string SuperClassName; |
| if (SuperClassDecl) { |
| SuperClassName = SuperClassDecl->getNameAsString(); |
| EmitClassRef(SuperClassName); |
| } |
| |
| // Get the class name |
| ObjCInterfaceDecl *ClassDecl = |
| const_cast<ObjCInterfaceDecl *>(OID->getClassInterface()); |
| std::string ClassName = ClassDecl->getNameAsString(); |
| // Emit the symbol that is used to generate linker errors if this class is |
| // referenced in other modules but not declared. |
| std::string classSymbolName = "__objc_class_name_" + ClassName; |
| if (llvm::GlobalVariable *symbol = |
| TheModule.getGlobalVariable(classSymbolName)) { |
| symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0)); |
| } else { |
| new llvm::GlobalVariable(TheModule, LongTy, false, |
| llvm::GlobalValue::ExternalLinkage, llvm::ConstantInt::get(LongTy, 0), |
| classSymbolName); |
| } |
| |
| // Get the size of instances. |
| int instanceSize = Context.getASTObjCImplementationLayout(OID).getSize() / 8; |
| |
| // Collect information about instance variables. |
| llvm::SmallVector<llvm::Constant*, 16> IvarNames; |
| llvm::SmallVector<llvm::Constant*, 16> IvarTypes; |
| llvm::SmallVector<llvm::Constant*, 16> IvarOffsets; |
| |
| int superInstanceSize = !SuperClassDecl ? 0 : |
| Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize() / 8; |
| // For non-fragile ivars, set the instance size to 0 - {the size of just this |
| // class}. The runtime will then set this to the correct value on load. |
| if (CGM.getContext().getLangOptions().ObjCNonFragileABI) { |
| instanceSize = 0 - (instanceSize - superInstanceSize); |
| } |
| for (ObjCInterfaceDecl::ivar_iterator iter = ClassDecl->ivar_begin(), |
| endIter = ClassDecl->ivar_end() ; iter != endIter ; iter++) { |
| // Store the name |
| IvarNames.push_back(CGM.GetAddrOfConstantCString((*iter) |
| ->getNameAsString())); |
| // Get the type encoding for this ivar |
| std::string TypeStr; |
| Context.getObjCEncodingForType((*iter)->getType(), TypeStr); |
| IvarTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| // Get the offset |
| uint64_t Offset; |
| if (CGM.getContext().getLangOptions().ObjCNonFragileABI) { |
| Offset = ComputeIvarBaseOffset(CGM, ClassDecl, *iter) - |
| superInstanceSize; |
| ObjCIvarOffsetVariable(ClassDecl, *iter); |
| } else { |
| Offset = ComputeIvarBaseOffset(CGM, ClassDecl, *iter); |
| } |
| IvarOffsets.push_back( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Offset)); |
| } |
| |
| // Collect information about instance methods |
| llvm::SmallVector<Selector, 16> InstanceMethodSels; |
| llvm::SmallVector<llvm::Constant*, 16> InstanceMethodTypes; |
| for (ObjCImplementationDecl::instmeth_iterator |
| iter = OID->instmeth_begin(), endIter = OID->instmeth_end(); |
| iter != endIter ; iter++) { |
| InstanceMethodSels.push_back((*iter)->getSelector()); |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl((*iter),TypeStr); |
| InstanceMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| for (ObjCImplDecl::propimpl_iterator |
| iter = OID->propimpl_begin(), endIter = OID->propimpl_end(); |
| iter != endIter ; iter++) { |
| ObjCPropertyDecl *property = (*iter)->getPropertyDecl(); |
| if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) { |
| InstanceMethodSels.push_back(getter->getSelector()); |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(getter,TypeStr); |
| InstanceMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) { |
| InstanceMethodSels.push_back(setter->getSelector()); |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(setter,TypeStr); |
| InstanceMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| } |
| |
| // Collect information about class methods |
| llvm::SmallVector<Selector, 16> ClassMethodSels; |
| llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
| for (ObjCImplementationDecl::classmeth_iterator |
| iter = OID->classmeth_begin(), endIter = OID->classmeth_end(); |
| iter != endIter ; iter++) { |
| ClassMethodSels.push_back((*iter)->getSelector()); |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl((*iter),TypeStr); |
| ClassMethodTypes.push_back(CGM.GetAddrOfConstantCString(TypeStr)); |
| } |
| // Collect the names of referenced protocols |
| llvm::SmallVector<std::string, 16> Protocols; |
| const ObjCList<ObjCProtocolDecl> &Protos =ClassDecl->getReferencedProtocols(); |
| for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(), |
| E = Protos.end(); I != E; ++I) |
| Protocols.push_back((*I)->getNameAsString()); |
| |
| |
| |
| // Get the superclass pointer. |
| llvm::Constant *SuperClass; |
| if (!SuperClassName.empty()) { |
| SuperClass = MakeConstantString(SuperClassName, ".super_class_name"); |
| } else { |
| SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty); |
| } |
| // Empty vector used to construct empty method lists |
| llvm::SmallVector<llvm::Constant*, 1> empty; |
| // Generate the method and instance variable lists |
| llvm::Constant *MethodList = GenerateMethodList(ClassName, "", |
| InstanceMethodSels, InstanceMethodTypes, false); |
| llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "", |
| ClassMethodSels, ClassMethodTypes, true); |
| llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes, |
| IvarOffsets); |
| //Generate metaclass for class methods |
| llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr, |
| NULLPtr, 0x2L, /*name*/"", 0, Zeros[0], GenerateIvarList( |
| empty, empty, empty), ClassMethodList, NULLPtr); |
| |
| // Generate the class structure |
| llvm::Constant *ClassStruct = |
| GenerateClassStructure(MetaClassStruct, SuperClass, 0x1L, |
| ClassName.c_str(), 0, |
| llvm::ConstantInt::get(LongTy, instanceSize), IvarList, |
| MethodList, GenerateProtocolList(Protocols)); |
| |
| // Resolve the class aliases, if they exist. |
| if (ClassPtrAlias) { |
| ClassPtrAlias->setAliasee( |
| llvm::ConstantExpr::getBitCast(ClassStruct, IdTy)); |
| ClassPtrAlias = 0; |
| } |
| if (MetaClassPtrAlias) { |
| MetaClassPtrAlias->setAliasee( |
| llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy)); |
| MetaClassPtrAlias = 0; |
| } |
| |
| // Add class structure to list to be added to the symtab later |
| ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty); |
| Classes.push_back(ClassStruct); |
| } |
| |
| |
| llvm::Function *CGObjCGNU::ModuleInitFunction() { |
| // Only emit an ObjC load function if no Objective-C stuff has been called |
| if (Classes.empty() && Categories.empty() && ConstantStrings.empty() && |
| ExistingProtocols.empty() && TypedSelectors.empty() && |
| UntypedSelectors.empty()) |
| return NULL; |
| |
| const llvm::StructType *SelStructTy = dyn_cast<llvm::StructType>( |
| SelectorTy->getElementType()); |
| const llvm::Type *SelStructPtrTy = SelectorTy; |
| bool isSelOpaque = false; |
| if (SelStructTy == 0) { |
| SelStructTy = llvm::StructType::get(VMContext, PtrToInt8Ty, |
| PtrToInt8Ty, NULL); |
| SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy); |
| isSelOpaque = true; |
| } |
| |
| // Name the ObjC types to make the IR a bit easier to read |
| TheModule.addTypeName(".objc_selector", SelStructPtrTy); |
| TheModule.addTypeName(".objc_id", IdTy); |
| TheModule.addTypeName(".objc_imp", IMPTy); |
| |
| std::vector<llvm::Constant*> Elements; |
| llvm::Constant *Statics = NULLPtr; |
| // Generate statics list: |
| if (ConstantStrings.size()) { |
| llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty, |
| ConstantStrings.size() + 1); |
| ConstantStrings.push_back(NULLPtr); |
| Elements.push_back(MakeConstantString("NSConstantString", |
| ".objc_static_class_name")); |
| Elements.push_back(llvm::ConstantArray::get(StaticsArrayTy, |
| ConstantStrings)); |
| llvm::StructType *StaticsListTy = |
| llvm::StructType::get(VMContext, PtrToInt8Ty, StaticsArrayTy, NULL); |
| llvm::Type *StaticsListPtrTy = |
| llvm::PointerType::getUnqual(StaticsListTy); |
| Statics = MakeGlobal(StaticsListTy, Elements, ".objc_statics"); |
| llvm::ArrayType *StaticsListArrayTy = |
| llvm::ArrayType::get(StaticsListPtrTy, 2); |
| Elements.clear(); |
| Elements.push_back(Statics); |
| Elements.push_back(llvm::Constant::getNullValue(StaticsListPtrTy)); |
| Statics = MakeGlobal(StaticsListArrayTy, Elements, ".objc_statics_ptr"); |
| Statics = llvm::ConstantExpr::getBitCast(Statics, PtrTy); |
| } |
| // Array of classes, categories, and constant objects |
| llvm::ArrayType *ClassListTy = llvm::ArrayType::get(PtrToInt8Ty, |
| Classes.size() + Categories.size() + 2); |
| llvm::StructType *SymTabTy = llvm::StructType::get(VMContext, |
| LongTy, SelStructPtrTy, |
| llvm::Type::getInt16Ty(VMContext), |
| llvm::Type::getInt16Ty(VMContext), |
| ClassListTy, NULL); |
| |
| Elements.clear(); |
| // Pointer to an array of selectors used in this module. |
| std::vector<llvm::Constant*> Selectors; |
| for (std::map<TypedSelector, llvm::GlobalAlias*>::iterator |
| iter = TypedSelectors.begin(), iterEnd = TypedSelectors.end(); |
| iter != iterEnd ; ++iter) { |
| Elements.push_back(MakeConstantString(iter->first.first, ".objc_sel_name")); |
| Elements.push_back(MakeConstantString(iter->first.second, |
| ".objc_sel_types")); |
| Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements)); |
| Elements.clear(); |
| } |
| for (llvm::StringMap<llvm::GlobalAlias*>::iterator |
| iter = UntypedSelectors.begin(), iterEnd = UntypedSelectors.end(); |
| iter != iterEnd; ++iter) { |
| Elements.push_back( |
| MakeConstantString(iter->getKeyData(), ".objc_sel_name")); |
| Elements.push_back(NULLPtr); |
| Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements)); |
| Elements.clear(); |
| } |
| Elements.push_back(NULLPtr); |
| Elements.push_back(NULLPtr); |
| Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements)); |
| Elements.clear(); |
| // Number of static selectors |
| Elements.push_back(llvm::ConstantInt::get(LongTy, Selectors.size() )); |
| llvm::Constant *SelectorList = MakeGlobal( |
| llvm::ArrayType::get(SelStructTy, Selectors.size()), Selectors, |
| ".objc_selector_list"); |
| Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList, |
| SelStructPtrTy)); |
| |
| // Now that all of the static selectors exist, create pointers to them. |
| int index = 0; |
| for (std::map<TypedSelector, llvm::GlobalAlias*>::iterator |
| iter=TypedSelectors.begin(), iterEnd =TypedSelectors.end(); |
| iter != iterEnd; ++iter) { |
| llvm::Constant *Idxs[] = {Zeros[0], |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), index++), Zeros[0]}; |
| llvm::Constant *SelPtr = new llvm::GlobalVariable(TheModule, SelStructPtrTy, |
| true, llvm::GlobalValue::InternalLinkage, |
| llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2), |
| ".objc_sel_ptr"); |
| // If selectors are defined as an opaque type, cast the pointer to this |
| // type. |
| if (isSelOpaque) { |
| SelPtr = llvm::ConstantExpr::getBitCast(SelPtr, |
| llvm::PointerType::getUnqual(SelectorTy)); |
| } |
| (*iter).second->setAliasee(SelPtr); |
| } |
| for (llvm::StringMap<llvm::GlobalAlias*>::iterator |
| iter=UntypedSelectors.begin(), iterEnd = UntypedSelectors.end(); |
| iter != iterEnd; iter++) { |
| llvm::Constant *Idxs[] = {Zeros[0], |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), index++), Zeros[0]}; |
| llvm::Constant *SelPtr = new llvm::GlobalVariable |
| (TheModule, SelStructPtrTy, |
| true, llvm::GlobalValue::InternalLinkage, |
| llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2), |
| ".objc_sel_ptr"); |
| // If selectors are defined as an opaque type, cast the pointer to this |
| // type. |
| if (isSelOpaque) { |
| SelPtr = llvm::ConstantExpr::getBitCast(SelPtr, |
| llvm::PointerType::getUnqual(SelectorTy)); |
| } |
| (*iter).second->setAliasee(SelPtr); |
| } |
| // Number of classes defined. |
| Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext), |
| Classes.size())); |
| // Number of categories defined |
| Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext), |
| Categories.size())); |
| // Create an array of classes, then categories, then static object instances |
| Classes.insert(Classes.end(), Categories.begin(), Categories.end()); |
| // NULL-terminated list of static object instances (mainly constant strings) |
| Classes.push_back(Statics); |
| Classes.push_back(NULLPtr); |
| llvm::Constant *ClassList = llvm::ConstantArray::get(ClassListTy, Classes); |
| Elements.push_back(ClassList); |
| // Construct the symbol table |
| llvm::Constant *SymTab= MakeGlobal(SymTabTy, Elements); |
| |
| // The symbol table is contained in a module which has some version-checking |
| // constants |
| llvm::StructType * ModuleTy = llvm::StructType::get(VMContext, LongTy, LongTy, |
| PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy), NULL); |
| Elements.clear(); |
| // Runtime version used for compatibility checking. |
| if (CGM.getContext().getLangOptions().ObjCNonFragileABI) { |
| Elements.push_back(llvm::ConstantInt::get(LongTy, |
| NonFragileRuntimeVersion)); |
| } else { |
| Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion)); |
| } |
| // sizeof(ModuleTy) |
| llvm::TargetData td = llvm::TargetData::TargetData(&TheModule); |
| Elements.push_back(llvm::ConstantInt::get(LongTy, |
| td.getTypeSizeInBits(ModuleTy)/8)); |
| //FIXME: Should be the path to the file where this module was declared |
| Elements.push_back(NULLPtr); |
| Elements.push_back(SymTab); |
| llvm::Value *Module = MakeGlobal(ModuleTy, Elements); |
| |
| // Create the load function calling the runtime entry point with the module |
| // structure |
| llvm::Function * LoadFunction = llvm::Function::Create( |
| llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false), |
| llvm::GlobalValue::InternalLinkage, ".objc_load_function", |
| &TheModule); |
| llvm::BasicBlock *EntryBB = |
| llvm::BasicBlock::Create(VMContext, "entry", LoadFunction); |
| CGBuilderTy Builder(VMContext); |
| Builder.SetInsertPoint(EntryBB); |
| |
| std::vector<const llvm::Type*> Params(1, |
| llvm::PointerType::getUnqual(ModuleTy)); |
| llvm::Value *Register = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| llvm::Type::getVoidTy(VMContext), Params, true), "__objc_exec_class"); |
| Builder.CreateCall(Register, Module); |
| Builder.CreateRetVoid(); |
| |
| return LoadFunction; |
| } |
| |
| llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD, |
| const ObjCContainerDecl *CD) { |
| const ObjCCategoryImplDecl *OCD = |
| dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext()); |
| std::string CategoryName = OCD ? OCD->getNameAsString() : ""; |
| std::string ClassName = OMD->getClassInterface()->getNameAsString(); |
| std::string MethodName = OMD->getSelector().getAsString(); |
| bool isClassMethod = !OMD->isInstanceMethod(); |
| |
| CodeGenTypes &Types = CGM.getTypes(); |
| const llvm::FunctionType *MethodTy = |
| Types.GetFunctionType(Types.getFunctionInfo(OMD), OMD->isVariadic()); |
| std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName, |
| MethodName, isClassMethod); |
| |
| llvm::Function *Method = llvm::Function::Create(MethodTy, |
| llvm::GlobalValue::InternalLinkage, |
| FunctionName, |
| &TheModule); |
| return Method; |
| } |
| |
| llvm::Function *CGObjCGNU::GetPropertyGetFunction() { |
| std::vector<const llvm::Type*> Params; |
| const llvm::Type *BoolTy = |
| CGM.getTypes().ConvertType(CGM.getContext().BoolTy); |
| Params.push_back(IdTy); |
| Params.push_back(SelectorTy); |
| // FIXME: Using LongTy for ptrdiff_t is probably broken on Win64 |
| Params.push_back(LongTy); |
| Params.push_back(BoolTy); |
| // void objc_getProperty (id, SEL, ptrdiff_t, bool) |
| const llvm::FunctionType *FTy = |
| llvm::FunctionType::get(IdTy, Params, false); |
| return cast<llvm::Function>(CGM.CreateRuntimeFunction(FTy, |
| "objc_getProperty")); |
| } |
| |
| llvm::Function *CGObjCGNU::GetPropertySetFunction() { |
| std::vector<const llvm::Type*> Params; |
| const llvm::Type *BoolTy = |
| CGM.getTypes().ConvertType(CGM.getContext().BoolTy); |
| Params.push_back(IdTy); |
| Params.push_back(SelectorTy); |
| // FIXME: Using LongTy for ptrdiff_t is probably broken on Win64 |
| Params.push_back(LongTy); |
| Params.push_back(IdTy); |
| Params.push_back(BoolTy); |
| Params.push_back(BoolTy); |
| // void objc_setProperty (id, SEL, ptrdiff_t, id, bool, bool) |
| const llvm::FunctionType *FTy = |
| llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Params, false); |
| return cast<llvm::Function>(CGM.CreateRuntimeFunction(FTy, |
| "objc_setProperty")); |
| } |
| |
| llvm::Constant *CGObjCGNU::EnumerationMutationFunction() { |
| CodeGen::CodeGenTypes &Types = CGM.getTypes(); |
| ASTContext &Ctx = CGM.getContext(); |
| // void objc_enumerationMutation (id) |
| llvm::SmallVector<QualType,16> Params; |
| Params.push_back(ASTIdTy); |
| const llvm::FunctionType *FTy = |
| Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params), false); |
| return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation"); |
| } |
| |
| void CGObjCGNU::EmitTryOrSynchronizedStmt(CodeGen::CodeGenFunction &CGF, |
| const Stmt &S) { |
| // Pointer to the personality function |
| llvm::Constant *Personality = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::getInt32Ty(VMContext), |
| true), |
| "__gnu_objc_personality_v0"); |
| Personality = llvm::ConstantExpr::getBitCast(Personality, PtrTy); |
| std::vector<const llvm::Type*> Params; |
| Params.push_back(PtrTy); |
| llvm::Value *RethrowFn = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), |
| Params, false), "_Unwind_Resume_or_Rethrow"); |
| |
| bool isTry = isa<ObjCAtTryStmt>(S); |
| llvm::BasicBlock *TryBlock = CGF.createBasicBlock("try"); |
| llvm::BasicBlock *PrevLandingPad = CGF.getInvokeDest(); |
| llvm::BasicBlock *TryHandler = CGF.createBasicBlock("try.handler"); |
| llvm::BasicBlock *CatchInCatch = CGF.createBasicBlock("catch.rethrow"); |
| llvm::BasicBlock *FinallyBlock = CGF.createBasicBlock("finally"); |
| llvm::BasicBlock *FinallyRethrow = CGF.createBasicBlock("finally.throw"); |
| llvm::BasicBlock *FinallyEnd = CGF.createBasicBlock("finally.end"); |
| |
| // GNU runtime does not currently support @synchronized() |
| if (!isTry) { |
| std::vector<const llvm::Type*> Args(1, IdTy); |
| llvm::FunctionType *FTy = |
| llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false); |
| llvm::Value *SyncEnter = CGM.CreateRuntimeFunction(FTy, "objc_sync_enter"); |
| llvm::Value *SyncArg = |
| CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); |
| SyncArg = CGF.Builder.CreateBitCast(SyncArg, IdTy); |
| CGF.Builder.CreateCall(SyncEnter, SyncArg); |
| } |
| |
| |
| // Push an EH context entry, used for handling rethrows and jumps |
| // through finally. |
| CGF.PushCleanupBlock(FinallyBlock); |
| |
| // Emit the statements in the @try {} block |
| CGF.setInvokeDest(TryHandler); |
| |
| CGF.EmitBlock(TryBlock); |
| CGF.EmitStmt(isTry ? cast<ObjCAtTryStmt>(S).getTryBody() |
| : cast<ObjCAtSynchronizedStmt>(S).getSynchBody()); |
| |
| // Jump to @finally if there is no exception |
| CGF.EmitBranchThroughCleanup(FinallyEnd); |
| |
| // Emit the handlers |
| CGF.EmitBlock(TryHandler); |
| |
| // Get the correct versions of the exception handling intrinsics |
| llvm::TargetData td = llvm::TargetData::TargetData(&TheModule); |
| int PointerWidth = td.getTypeSizeInBits(PtrTy); |
| assert((PointerWidth == 32 || PointerWidth == 64) && |
| "Can't yet handle exceptions if pointers are not 32 or 64 bits"); |
| llvm::Value *llvm_eh_exception = |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_exception); |
| llvm::Value *llvm_eh_selector = PointerWidth == 32 ? |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_selector_i32) : |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_selector_i64); |
| llvm::Value *llvm_eh_typeid_for = PointerWidth == 32 ? |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for_i32) : |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for_i64); |
| |
| // Exception object |
| llvm::Value *Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); |
| llvm::Value *RethrowPtr = CGF.CreateTempAlloca(Exc->getType(), "_rethrow"); |
| |
| llvm::SmallVector<llvm::Value*, 8> ESelArgs; |
| llvm::SmallVector<std::pair<const ParmVarDecl*, const Stmt*>, 8> Handlers; |
| |
| ESelArgs.push_back(Exc); |
| ESelArgs.push_back(Personality); |
| |
| bool HasCatchAll = false; |
| // Only @try blocks are allowed @catch blocks, but both can have @finally |
| if (isTry) { |
| if (const ObjCAtCatchStmt* CatchStmt = |
| cast<ObjCAtTryStmt>(S).getCatchStmts()) { |
| CGF.setInvokeDest(CatchInCatch); |
| |
| for (; CatchStmt; CatchStmt = CatchStmt->getNextCatchStmt()) { |
| const ParmVarDecl *CatchDecl = CatchStmt->getCatchParamDecl(); |
| Handlers.push_back(std::make_pair(CatchDecl, |
| CatchStmt->getCatchBody())); |
| |
| // @catch() and @catch(id) both catch any ObjC exception |
| if (!CatchDecl || CatchDecl->getType()->isObjCIdType() |
| || CatchDecl->getType()->isObjCQualifiedIdType()) { |
| // Use i8* null here to signal this is a catch all, not a cleanup. |
| ESelArgs.push_back(NULLPtr); |
| HasCatchAll = true; |
| // No further catches after this one will ever by reached |
| break; |
| } |
| |
| // All other types should be Objective-C interface pointer types. |
| const ObjCObjectPointerType *OPT = |
| CatchDecl->getType()->getAsObjCObjectPointerType(); |
| assert(OPT && "Invalid @catch type."); |
| const ObjCInterfaceType *IT = |
| OPT->getPointeeType()->getAsObjCInterfaceType(); |
| assert(IT && "Invalid @catch type."); |
| llvm::Value *EHType = |
| MakeConstantString(IT->getDecl()->getNameAsString()); |
| ESelArgs.push_back(EHType); |
| } |
| } |
| } |
| |
| // We use a cleanup unless there was already a catch all. |
| if (!HasCatchAll) { |
| ESelArgs.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 0)); |
| Handlers.push_back(std::make_pair((const ParmVarDecl*) 0, (const Stmt*) 0)); |
| } |
| |
| // Find which handler was matched. |
| llvm::Value *ESelector = CGF.Builder.CreateCall(llvm_eh_selector, |
| ESelArgs.begin(), ESelArgs.end(), "selector"); |
| |
| for (unsigned i = 0, e = Handlers.size(); i != e; ++i) { |
| const ParmVarDecl *CatchParam = Handlers[i].first; |
| const Stmt *CatchBody = Handlers[i].second; |
| |
| llvm::BasicBlock *Next = 0; |
| |
| // The last handler always matches. |
| if (i + 1 != e) { |
| assert(CatchParam && "Only last handler can be a catch all."); |
| |
| // Test whether this block matches the type for the selector and branch |
| // to Match if it does, or to the next BB if it doesn't. |
| llvm::BasicBlock *Match = CGF.createBasicBlock("match"); |
| Next = CGF.createBasicBlock("catch.next"); |
| llvm::Value *Id = CGF.Builder.CreateCall(llvm_eh_typeid_for, |
| CGF.Builder.CreateBitCast(ESelArgs[i+2], PtrTy)); |
| CGF.Builder.CreateCondBr(CGF.Builder.CreateICmpEQ(ESelector, Id), Match, |
| Next); |
| |
| CGF.EmitBlock(Match); |
| } |
| |
| if (CatchBody) { |
| llvm::Value *ExcObject = CGF.Builder.CreateBitCast(Exc, |
| CGF.ConvertType(CatchParam->getType())); |
| |
| // Bind the catch parameter if it exists. |
| if (CatchParam) { |
| // CatchParam is a ParmVarDecl because of the grammar |
| // construction used to handle this, but for codegen purposes |
| // we treat this as a local decl. |
| CGF.EmitLocalBlockVarDecl(*CatchParam); |
| CGF.Builder.CreateStore(ExcObject, CGF.GetAddrOfLocalVar(CatchParam)); |
| } |
| |
| CGF.ObjCEHValueStack.push_back(ExcObject); |
| CGF.EmitStmt(CatchBody); |
| CGF.ObjCEHValueStack.pop_back(); |
| |
| CGF.EmitBranchThroughCleanup(FinallyEnd); |
| |
| if (Next) |
| CGF.EmitBlock(Next); |
| } else { |
| assert(!Next && "catchup should be last handler."); |
| |
| CGF.Builder.CreateStore(Exc, RethrowPtr); |
| CGF.EmitBranchThroughCleanup(FinallyRethrow); |
| } |
| } |
| // The @finally block is a secondary landing pad for any exceptions thrown in |
| // @catch() blocks |
| CGF.EmitBlock(CatchInCatch); |
| Exc = CGF.Builder.CreateCall(llvm_eh_exception, "exc"); |
| ESelArgs.clear(); |
| ESelArgs.push_back(Exc); |
| ESelArgs.push_back(Personality); |
| ESelArgs.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), 0)); |
| CGF.Builder.CreateCall(llvm_eh_selector, ESelArgs.begin(), ESelArgs.end(), |
| "selector"); |
| CGF.Builder.CreateCall(llvm_eh_typeid_for, |
| CGF.Builder.CreateIntToPtr(ESelArgs[2], PtrTy)); |
| CGF.Builder.CreateStore(Exc, RethrowPtr); |
| CGF.EmitBranchThroughCleanup(FinallyRethrow); |
| |
| CodeGenFunction::CleanupBlockInfo Info = CGF.PopCleanupBlock(); |
| |
| CGF.setInvokeDest(PrevLandingPad); |
| |
| CGF.EmitBlock(FinallyBlock); |
| |
| |
| if (isTry) { |
| if (const ObjCAtFinallyStmt* FinallyStmt = |
| cast<ObjCAtTryStmt>(S).getFinallyStmt()) |
| CGF.EmitStmt(FinallyStmt->getFinallyBody()); |
| } else { |
| // Emit 'objc_sync_exit(expr)' as finally's sole statement for |
| // @synchronized. |
| std::vector<const llvm::Type*> Args(1, IdTy); |
| llvm::FunctionType *FTy = |
| llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false); |
| llvm::Value *SyncExit = CGM.CreateRuntimeFunction(FTy, "objc_sync_exit"); |
| llvm::Value *SyncArg = |
| CGF.EmitScalarExpr(cast<ObjCAtSynchronizedStmt>(S).getSynchExpr()); |
| SyncArg = CGF.Builder.CreateBitCast(SyncArg, IdTy); |
| CGF.Builder.CreateCall(SyncExit, SyncArg); |
| } |
| |
| if (Info.SwitchBlock) |
| CGF.EmitBlock(Info.SwitchBlock); |
| if (Info.EndBlock) |
| CGF.EmitBlock(Info.EndBlock); |
| |
| // Branch around the rethrow code. |
| CGF.EmitBranch(FinallyEnd); |
| |
| CGF.EmitBlock(FinallyRethrow); |
| CGF.Builder.CreateCall(RethrowFn, CGF.Builder.CreateLoad(RethrowPtr)); |
| CGF.Builder.CreateUnreachable(); |
| |
| CGF.EmitBlock(FinallyEnd); |
| |
| } |
| |
| void CGObjCGNU::EmitThrowStmt(CodeGen::CodeGenFunction &CGF, |
| const ObjCAtThrowStmt &S) { |
| llvm::Value *ExceptionAsObject; |
| |
| std::vector<const llvm::Type*> Args(1, IdTy); |
| llvm::FunctionType *FTy = |
| llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false); |
| llvm::Value *ThrowFn = |
| CGM.CreateRuntimeFunction(FTy, "objc_exception_throw"); |
| |
| if (const Expr *ThrowExpr = S.getThrowExpr()) { |
| llvm::Value *Exception = CGF.EmitScalarExpr(ThrowExpr); |
| ExceptionAsObject = Exception; |
| } else { |
| assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && |
| "Unexpected rethrow outside @catch block."); |
| ExceptionAsObject = CGF.ObjCEHValueStack.back(); |
| } |
| ExceptionAsObject = |
| CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy, "tmp"); |
| |
| // Note: This may have to be an invoke, if we want to support constructs like: |
| // @try { |
| // @throw(obj); |
| // } |
| // @catch(id) ... |
| // |
| // This is effectively turning @throw into an incredibly-expensive goto, but |
| // it may happen as a result of inlining followed by missed optimizations, or |
| // as a result of stupidity. |
| llvm::BasicBlock *UnwindBB = CGF.getInvokeDest(); |
| if (!UnwindBB) { |
| CGF.Builder.CreateCall(ThrowFn, ExceptionAsObject); |
| CGF.Builder.CreateUnreachable(); |
| } else { |
| CGF.Builder.CreateInvoke(ThrowFn, UnwindBB, UnwindBB, &ExceptionAsObject, |
| &ExceptionAsObject+1); |
| } |
| // Clear the insertion point to indicate we are in unreachable code. |
| CGF.Builder.ClearInsertionPoint(); |
| } |
| |
| llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *AddrWeakObj) |
| { |
| return 0; |
| } |
| |
| void CGObjCGNU::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) |
| { |
| return; |
| } |
| |
| void CGObjCGNU::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) |
| { |
| return; |
| } |
| |
| void CGObjCGNU::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) |
| { |
| return; |
| } |
| |
| void CGObjCGNU::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) |
| { |
| return; |
| } |
| |
| void CGObjCGNU::EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *DestPtr, |
| llvm::Value *SrcPtr, |
| unsigned long size) { |
| return; |
| } |
| |
| llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable( |
| const ObjCInterfaceDecl *ID, |
| const ObjCIvarDecl *Ivar) { |
| const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString() |
| + '.' + Ivar->getNameAsString(); |
| // Emit the variable and initialize it with what we think the correct value |
| // is. This allows code compiled with non-fragile ivars to work correctly |
| // when linked against code which isn't (most of the time). |
| llvm::GlobalVariable *IvarOffsetGV = CGM.getModule().getGlobalVariable(Name); |
| if (!IvarOffsetGV) { |
| uint64_t Offset = ComputeIvarBaseOffset(CGM, ID, Ivar); |
| llvm::ConstantInt *OffsetGuess = |
| llvm::ConstantInt::get(LongTy, Offset, "ivar"); |
| IvarOffsetGV = new llvm::GlobalVariable(TheModule, LongTy, false, |
| llvm::GlobalValue::WeakAnyLinkage, OffsetGuess, Name); |
| } |
| return IvarOffsetGV; |
| } |
| |
| LValue CGObjCGNU::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, |
| QualType ObjectTy, |
| llvm::Value *BaseValue, |
| const ObjCIvarDecl *Ivar, |
| unsigned CVRQualifiers) { |
| const ObjCInterfaceDecl *ID = ObjectTy->getAsObjCInterfaceType()->getDecl(); |
| return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers, |
| EmitIvarOffset(CGF, ID, Ivar)); |
| } |
| |
| static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context, |
| const ObjCInterfaceDecl *OID, |
| const ObjCIvarDecl *OIVD) { |
| llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; |
| Context.ShallowCollectObjCIvars(OID, Ivars); |
| for (unsigned k = 0, e = Ivars.size(); k != e; ++k) { |
| if (OIVD == Ivars[k]) |
| return OID; |
| } |
| |
| // Otherwise check in the super class. |
| if (const ObjCInterfaceDecl *Super = OID->getSuperClass()) |
| return FindIvarInterface(Context, Super, OIVD); |
| |
| return 0; |
| } |
| |
| llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGen::CodeGenFunction &CGF, |
| const ObjCInterfaceDecl *Interface, |
| const ObjCIvarDecl *Ivar) { |
| if (CGF.getContext().getLangOptions().ObjCNonFragileABI) { |
| Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar); |
| return CGF.Builder.CreateLoad(ObjCIvarOffsetVariable(Interface, Ivar), |
| false, "ivar"); |
| } |
| uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar); |
| return llvm::ConstantInt::get(LongTy, Offset, "ivar"); |
| } |
| |
| CodeGen::CGObjCRuntime * |
| CodeGen::CreateGNUObjCRuntime(CodeGen::CodeGenModule &CGM) { |
| return new CGObjCGNU(CGM); |
| } |
