| //===------- 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; |
| static const int NonFragileProtocolVersion = 3; |
| |
| namespace { |
| class CGObjCGNU : public CodeGen::CGObjCRuntime { |
| private: |
| CodeGen::CodeGenModule &CGM; |
| llvm::Module &TheModule; |
| const llvm::PointerType *SelectorTy; |
| const llvm::IntegerType *Int8Ty; |
| const llvm::PointerType *PtrToInt8Ty; |
| const llvm::FunctionType *IMPTy; |
| const llvm::PointerType *IdTy; |
| const llvm::PointerType *PtrToIdTy; |
| CanQualType 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::StringMap<llvm::Constant*> ObjCStrings; |
| 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; |
| // Selectors that we don't emit in GC mode |
| Selector RetainSel, ReleaseSel, AutoreleaseSel; |
| // Functions used for GC. |
| llvm::Constant *IvarAssignFn, *StrongCastAssignFn, *MemMoveFn, *WeakReadFn, |
| *WeakAssignFn, *GlobalAssignFn; |
| // 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 *GeneratePropertyList(const ObjCImplementationDecl *OID, |
| llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| llvm::SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes); |
| llvm::Constant *GenerateProtocolList( |
| const llvm::SmallVectorImpl<std::string> &Protocols); |
| // To ensure that all protocols are seen by the runtime, we add a category on |
| // a class defined in the runtime, declaring no methods, but adopting the |
| // protocols. |
| void GenerateProtocolHolderCategory(void); |
| 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 *IvarOffsets, |
| llvm::Constant *Properties); |
| 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 *ExportUniqueString(const std::string &Str, const std::string |
| prefix); |
| llvm::Constant *MakeGlobal(const llvm::StructType *Ty, |
| std::vector<llvm::Constant*> &V, llvm::StringRef Name="", |
| llvm::GlobalValue::LinkageTypes linkage=llvm::GlobalValue::InternalLinkage); |
| llvm::Constant *MakeGlobal(const llvm::ArrayType *Ty, |
| std::vector<llvm::Constant*> &V, llvm::StringRef Name="", |
| llvm::GlobalValue::LinkageTypes linkage=llvm::GlobalValue::InternalLinkage); |
| llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID, |
| const ObjCIvarDecl *Ivar); |
| void EmitClassRef(const std::string &className); |
| llvm::Value* EnforceType(CGBuilderTy B, llvm::Value *V, const llvm::Type *Ty){ |
| if (V->getType() == Ty) return V; |
| return B.CreateBitCast(V, Ty); |
| } |
| public: |
| CGObjCGNU(CodeGen::CodeGenModule &cgm); |
| virtual llvm::Constant *GenerateConstantString(const StringLiteral *); |
| 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, |
| const ObjCMethodDecl *Method); |
| 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, |
| llvm::Value *ivarOffset); |
| virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest); |
| virtual void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *DestPtr, |
| llvm::Value *SrcPtr, |
| QualType Ty); |
| 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) |
| { |
| std::string MethodNameColonStripped = MethodName; |
| std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(), |
| ':', '_'); |
| return std::string(isClassMethod ? "_c_" : "_i_") + ClassName + "_" + |
| CategoryName + "_" + MethodNameColonStripped; |
| } |
| |
| 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)); |
| |
| Int8Ty = llvm::Type::getInt8Ty(VMContext); |
| // C string type. Used in lots of places. |
| PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty); |
| |
| Zeros[0] = llvm::ConstantInt::get(LongTy, 0); |
| Zeros[1] = Zeros[0]; |
| NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty); |
| // Get the selector Type. |
| QualType selTy = CGM.getContext().getObjCSelType(); |
| if (QualType() == selTy) { |
| SelectorTy = PtrToInt8Ty; |
| } else { |
| SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy)); |
| } |
| |
| PtrToIntTy = llvm::PointerType::getUnqual(IntTy); |
| PtrTy = PtrToInt8Ty; |
| |
| // Object type |
| ASTIdTy = CGM.getContext().getCanonicalType(CGM.getContext().getObjCIdType()); |
| if (QualType() == ASTIdTy) { |
| IdTy = PtrToInt8Ty; |
| } else { |
| IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
| } |
| PtrToIdTy = llvm::PointerType::getUnqual(IdTy); |
| |
| // IMP type |
| std::vector<const llvm::Type*> IMPArgs; |
| IMPArgs.push_back(IdTy); |
| IMPArgs.push_back(SelectorTy); |
| IMPTy = llvm::FunctionType::get(IdTy, IMPArgs, true); |
| |
| if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) { |
| // Get selectors needed in GC mode |
| RetainSel = GetNullarySelector("retain", CGM.getContext()); |
| ReleaseSel = GetNullarySelector("release", CGM.getContext()); |
| AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext()); |
| |
| // Get functions needed in GC mode |
| |
| // id objc_assign_ivar(id, id, ptrdiff_t); |
| std::vector<const llvm::Type*> Args(1, IdTy); |
| Args.push_back(PtrToIdTy); |
| // FIXME: ptrdiff_t |
| Args.push_back(LongTy); |
| llvm::FunctionType *FTy = llvm::FunctionType::get(IdTy, Args, false); |
| IvarAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar"); |
| // id objc_assign_strongCast (id, id*) |
| Args.pop_back(); |
| FTy = llvm::FunctionType::get(IdTy, Args, false); |
| StrongCastAssignFn = |
| CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast"); |
| // id objc_assign_global(id, id*); |
| FTy = llvm::FunctionType::get(IdTy, Args, false); |
| GlobalAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_global"); |
| // id objc_assign_weak(id, id*); |
| FTy = llvm::FunctionType::get(IdTy, Args, false); |
| WeakAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_weak"); |
| // id objc_read_weak(id*); |
| Args.clear(); |
| Args.push_back(PtrToIdTy); |
| FTy = llvm::FunctionType::get(IdTy, Args, false); |
| WeakReadFn = CGM.CreateRuntimeFunction(FTy, "objc_read_weak"); |
| // void *objc_memmove_collectable(void*, void *, size_t); |
| Args.clear(); |
| Args.push_back(PtrToInt8Ty); |
| Args.push_back(PtrToInt8Ty); |
| // FIXME: size_t |
| Args.push_back(LongTy); |
| FTy = llvm::FunctionType::get(IdTy, Args, false); |
| MemMoveFn = CGM.CreateRuntimeFunction(FTy, "objc_memmove_collectable"); |
| } |
| } |
| |
| // 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()); |
| // With the incompatible ABI, this will need to be replaced with a direct |
| // reference to the class symbol. For the compatible nonfragile ABI we are |
| // still performing this lookup at run time but emitting the symbol for the |
| // class externally so that we can make the switch later. |
| 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 = CGM.GetAddrOfConstantCString(Str, Name.c_str()); |
| return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2); |
| } |
| llvm::Constant *CGObjCGNU::ExportUniqueString(const std::string &Str, |
| const std::string prefix) { |
| std::string name = prefix + Str; |
| llvm::Constant *ConstStr = TheModule.getGlobalVariable(name); |
| if (!ConstStr) { |
| llvm::Constant *value = llvm::ConstantArray::get(VMContext, Str, true); |
| ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true, |
| llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str); |
| } |
| return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2); |
| } |
| |
| llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::StructType *Ty, |
| std::vector<llvm::Constant*> &V, llvm::StringRef Name, |
| llvm::GlobalValue::LinkageTypes linkage) { |
| 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, llvm::StringRef Name, |
| llvm::GlobalValue::LinkageTypes linkage) { |
| llvm::Constant *C = llvm::ConstantArray::get(Ty, V); |
| return new llvm::GlobalVariable(TheModule, Ty, false, |
| llvm::GlobalValue::InternalLinkage, C, Name); |
| } |
| |
| /// Generate an NSConstantString object. |
| llvm::Constant *CGObjCGNU::GenerateConstantString(const StringLiteral *SL) { |
| |
| std::string Str(SL->getStrData(), SL->getByteLength()); |
| |
| // Look for an existing one |
| llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str); |
| if (old != ObjCStrings.end()) |
| return old->getValue(); |
| |
| 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"); |
| ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty); |
| ObjCStrings[Str] = ObjCStr; |
| ConstantStrings.push_back(ObjCStr); |
| 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, |
| const ObjCMethodDecl *Method) { |
| if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) { |
| if (Sel == RetainSel || Sel == AutoreleaseSel) { |
| return RValue::get(Receiver); |
| } |
| if (Sel == ReleaseSel) { |
| return RValue::get(0); |
| } |
| } |
| 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, |
| CC_Default, false); |
| const llvm::FunctionType *impType = |
| Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : 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, ReturnValueSlot(), 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) { |
| if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) { |
| if (Sel == RetainSel || Sel == AutoreleaseSel) { |
| return RValue::get(Receiver); |
| } |
| if (Sel == ReleaseSel) { |
| return RValue::get(0); |
| } |
| } |
| CGBuilderTy &Builder = CGF.Builder; |
| IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
| llvm::Value *cmd; |
| if (Method) |
| cmd = GetSelector(Builder, Method); |
| else |
| cmd = GetSelector(Builder, Sel); |
| CallArgList ActualArgs; |
| |
| Receiver = Builder.CreateBitCast(Receiver, IdTy); |
| ActualArgs.push_back( |
| std::make_pair(RValue::get(Receiver), 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, |
| CC_Default, false); |
| const llvm::FunctionType *impType = |
| Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false); |
| |
| llvm::Value *imp; |
| // 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().ObjCNonFragileABI) { |
| |
| std::vector<const llvm::Type*> Params; |
| llvm::Value *ReceiverPtr = CGF.CreateTempAlloca(Receiver->getType()); |
| Builder.CreateStore(Receiver, ReceiverPtr); |
| Params.push_back(ReceiverPtr->getType()); |
| Params.push_back(SelectorTy); |
| llvm::Value *self; |
| |
| if (isa<ObjCMethodDecl>(CGF.CurFuncDecl)) { |
| self = CGF.LoadObjCSelf(); |
| } else { |
| self = llvm::ConstantPointerNull::get(IdTy); |
| } |
| |
| Params.push_back(self->getType()); |
| |
| // The lookup function returns a slot, which can be safely cached. |
| llvm::Type *SlotTy = llvm::StructType::get(VMContext, PtrTy, PtrTy, PtrTy, |
| IntTy, llvm::PointerType::getUnqual(impType), NULL); |
| llvm::Constant *lookupFunction = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| llvm::PointerType::getUnqual(SlotTy), Params, true), |
| "objc_msg_lookup_sender"); |
| |
| // The lookup function is guaranteed not to capture the receiver pointer. |
| if (llvm::Function *LookupFn = dyn_cast<llvm::Function>(lookupFunction)) { |
| LookupFn->setDoesNotCapture(1); |
| } |
| |
| llvm::Value *slot = |
| Builder.CreateCall3(lookupFunction, ReceiverPtr, cmd, self); |
| imp = Builder.CreateLoad(Builder.CreateStructGEP(slot, 4)); |
| // The lookup function may have changed the receiver, so make sure we use |
| // the new one. |
| ActualArgs[0] = |
| std::make_pair(RValue::get(Builder.CreateLoad(ReceiverPtr)), ASTIdTy); |
| } else { |
| std::vector<const llvm::Type*> Params; |
| Params.push_back(Receiver->getType()); |
| Params.push_back(SelectorTy); |
| llvm::Constant *lookupFunction = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| llvm::PointerType::getUnqual(impType), Params, true), |
| "objc_msg_lookup"); |
| |
| imp = Builder.CreateCall2(lookupFunction, Receiver, cmd); |
| } |
| |
| return CGF.EmitCall(FnInfo, imp, ReturnValueSlot(), 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 = MakeConstantString(MethodSels[i].getAsString()); |
| Elements.push_back(C); |
| Elements.push_back(MethodTypes[i]); |
| 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) { |
| if (IvarNames.size() == 0) |
| return NULLPtr; |
| // 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(IvarNames[i]); |
| Elements.push_back(IvarTypes[i]); |
| 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, |
| llvm::Constant *IvarOffsets, |
| llvm::Constant *Properties) { |
| // 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. |
| // |
| // Fields marked New ABI are part of the GNUstep runtime. We emit them |
| // anyway; the classes will still work with the GNU runtime, they will just |
| // be ignored. |
| 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 |
| // New ABI: |
| LongTy, // abi_version |
| IvarOffsets->getType(), // ivar_offsets |
| Properties->getType(), // properties |
| NULL); |
| llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0); |
| // 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(NULLPtr); |
| Elements.push_back(NULLPtr); |
| Elements.push_back(NULLPtr); |
| Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy)); |
| Elements.push_back(NULLPtr); |
| Elements.push_back(Zero); |
| Elements.push_back(IvarOffsets); |
| Elements.push_back(Properties); |
| // Create an instance of the structure |
| // This is now an externally visible symbol, so that we can speed up class |
| // messages in the next ABI. |
| return MakeGlobal(ClassTy, Elements, SymbolNameForClass(Name), |
| llvm::GlobalValue::ExternalLinkage); |
| } |
| |
| 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(MethodNames[i]); |
| Elements.push_back(MethodTypes[i]); |
| 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 = 0; |
| llvm::StringMap<llvm::Constant*>::iterator value = |
| ExistingProtocols.find(*iter); |
| if (value == ExistingProtocols.end()) { |
| protocol = GenerateEmptyProtocol(*iter); |
| } else { |
| protocol = value->getValue(); |
| } |
| 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 *MethodList = |
| 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(), |
| MethodList->getType(), |
| MethodList->getType(), |
| MethodList->getType(), |
| MethodList->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. |
| int Version = CGM.getContext().getLangOptions().ObjCNonFragileABI ? |
| NonFragileProtocolVersion : ProtocolVersion; |
| Elements.push_back(llvm::ConstantExpr::getIntToPtr( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Version), IdTy)); |
| Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
| Elements.push_back(ProtocolList); |
| Elements.push_back(MethodList); |
| Elements.push_back(MethodList); |
| Elements.push_back(MethodList); |
| Elements.push_back(MethodList); |
| 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; |
| llvm::SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames; |
| llvm::SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes; |
| for (ObjCProtocolDecl::instmeth_iterator iter = PD->instmeth_begin(), |
| E = PD->instmeth_end(); iter != E; iter++) { |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(*iter, TypeStr); |
| if ((*iter)->getImplementationControl() == ObjCMethodDecl::Optional) { |
| InstanceMethodNames.push_back( |
| MakeConstantString((*iter)->getSelector().getAsString())); |
| InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); |
| } else { |
| OptionalInstanceMethodNames.push_back( |
| MakeConstantString((*iter)->getSelector().getAsString())); |
| OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr)); |
| } |
| } |
| // Collect information about class methods: |
| llvm::SmallVector<llvm::Constant*, 16> ClassMethodNames; |
| llvm::SmallVector<llvm::Constant*, 16> ClassMethodTypes; |
| llvm::SmallVector<llvm::Constant*, 16> OptionalClassMethodNames; |
| llvm::SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes; |
| for (ObjCProtocolDecl::classmeth_iterator |
| iter = PD->classmeth_begin(), endIter = PD->classmeth_end(); |
| iter != endIter ; iter++) { |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl((*iter),TypeStr); |
| if ((*iter)->getImplementationControl() == ObjCMethodDecl::Optional) { |
| ClassMethodNames.push_back( |
| MakeConstantString((*iter)->getSelector().getAsString())); |
| ClassMethodTypes.push_back(MakeConstantString(TypeStr)); |
| } else { |
| OptionalClassMethodNames.push_back( |
| MakeConstantString((*iter)->getSelector().getAsString())); |
| OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr)); |
| } |
| } |
| |
| llvm::Constant *ProtocolList = GenerateProtocolList(Protocols); |
| llvm::Constant *InstanceMethodList = |
| GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes); |
| llvm::Constant *ClassMethodList = |
| GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes); |
| llvm::Constant *OptionalInstanceMethodList = |
| GenerateProtocolMethodList(OptionalInstanceMethodNames, |
| OptionalInstanceMethodTypes); |
| llvm::Constant *OptionalClassMethodList = |
| GenerateProtocolMethodList(OptionalClassMethodNames, |
| OptionalClassMethodTypes); |
| |
| // Property metadata: name, attributes, isSynthesized, setter name, setter |
| // types, getter name, getter types. |
| // The isSynthesized value is always set to 0 in a protocol. It exists to |
| // simplify the runtime library by allowing it to use the same data |
| // structures for protocol metadata everywhere. |
| llvm::StructType *PropertyMetadataTy = llvm::StructType::get(VMContext, |
| PtrToInt8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, |
| PtrToInt8Ty, NULL); |
| std::vector<llvm::Constant*> Properties; |
| std::vector<llvm::Constant*> OptionalProperties; |
| |
| // Add all of the property methods need adding to the method list and to the |
| // property metadata list. |
| for (ObjCContainerDecl::prop_iterator |
| iter = PD->prop_begin(), endIter = PD->prop_end(); |
| iter != endIter ; iter++) { |
| std::vector<llvm::Constant*> Fields; |
| ObjCPropertyDecl *property = (*iter); |
| |
| Fields.push_back(MakeConstantString(property->getNameAsString())); |
| Fields.push_back(llvm::ConstantInt::get(Int8Ty, |
| property->getPropertyAttributes())); |
| Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0)); |
| if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) { |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(getter,TypeStr); |
| llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); |
| InstanceMethodTypes.push_back(TypeEncoding); |
| Fields.push_back(MakeConstantString(getter->getSelector().getAsString())); |
| Fields.push_back(TypeEncoding); |
| } else { |
| Fields.push_back(NULLPtr); |
| Fields.push_back(NULLPtr); |
| } |
| if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) { |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(setter,TypeStr); |
| llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); |
| InstanceMethodTypes.push_back(TypeEncoding); |
| Fields.push_back(MakeConstantString(setter->getSelector().getAsString())); |
| Fields.push_back(TypeEncoding); |
| } else { |
| Fields.push_back(NULLPtr); |
| Fields.push_back(NULLPtr); |
| } |
| if (property->getPropertyImplementation() == ObjCPropertyDecl::Optional) { |
| OptionalProperties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields)); |
| } else { |
| Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields)); |
| } |
| } |
| llvm::Constant *PropertyArray = llvm::ConstantArray::get( |
| llvm::ArrayType::get(PropertyMetadataTy, Properties.size()), Properties); |
| llvm::Constant* PropertyListInitFields[] = |
| {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray}; |
| |
| llvm::Constant *PropertyListInit = |
| llvm::ConstantStruct::get(VMContext, PropertyListInitFields, 3, false); |
| llvm::Constant *PropertyList = new llvm::GlobalVariable(TheModule, |
| PropertyListInit->getType(), false, llvm::GlobalValue::InternalLinkage, |
| PropertyListInit, ".objc_property_list"); |
| |
| llvm::Constant *OptionalPropertyArray = |
| llvm::ConstantArray::get(llvm::ArrayType::get(PropertyMetadataTy, |
| OptionalProperties.size()) , OptionalProperties); |
| llvm::Constant* OptionalPropertyListInitFields[] = { |
| llvm::ConstantInt::get(IntTy, OptionalProperties.size()), NULLPtr, |
| OptionalPropertyArray }; |
| |
| llvm::Constant *OptionalPropertyListInit = |
| llvm::ConstantStruct::get(VMContext, OptionalPropertyListInitFields, 3, false); |
| llvm::Constant *OptionalPropertyList = new llvm::GlobalVariable(TheModule, |
| OptionalPropertyListInit->getType(), false, |
| llvm::GlobalValue::InternalLinkage, OptionalPropertyListInit, |
| ".objc_property_list"); |
| |
| // 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(), |
| OptionalInstanceMethodList->getType(), |
| OptionalClassMethodList->getType(), |
| PropertyList->getType(), |
| OptionalPropertyList->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. |
| int Version = CGM.getContext().getLangOptions().ObjCNonFragileABI ? |
| NonFragileProtocolVersion : ProtocolVersion; |
| Elements.push_back(llvm::ConstantExpr::getIntToPtr( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Version), IdTy)); |
| Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
| Elements.push_back(ProtocolList); |
| Elements.push_back(InstanceMethodList); |
| Elements.push_back(ClassMethodList); |
| Elements.push_back(OptionalInstanceMethodList); |
| Elements.push_back(OptionalClassMethodList); |
| Elements.push_back(PropertyList); |
| Elements.push_back(OptionalPropertyList); |
| ExistingProtocols[ProtocolName] = |
| llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements, |
| ".objc_protocol"), IdTy); |
| } |
| void CGObjCGNU::GenerateProtocolHolderCategory(void) { |
| // Collect information about instance methods |
| llvm::SmallVector<Selector, 1> MethodSels; |
| llvm::SmallVector<llvm::Constant*, 1> MethodTypes; |
| |
| std::vector<llvm::Constant*> Elements; |
| const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack"; |
| const std::string CategoryName = "AnotherHack"; |
| Elements.push_back(MakeConstantString(CategoryName)); |
| Elements.push_back(MakeConstantString(ClassName)); |
| // Instance method list |
| Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( |
| ClassName, CategoryName, MethodSels, MethodTypes, false), PtrTy)); |
| // Class method list |
| Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( |
| ClassName, CategoryName, MethodSels, MethodTypes, true), PtrTy)); |
| // Protocol list |
| llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrTy, |
| ExistingProtocols.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*> ProtocolElements; |
| for (llvm::StringMapIterator<llvm::Constant*> iter = |
| ExistingProtocols.begin(), endIter = ExistingProtocols.end(); |
| iter != endIter ; iter++) { |
| llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(iter->getValue(), |
| PtrTy); |
| ProtocolElements.push_back(Ptr); |
| } |
| llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy, |
| ProtocolElements); |
| ProtocolElements.clear(); |
| ProtocolElements.push_back(NULLPtr); |
| ProtocolElements.push_back(llvm::ConstantInt::get(LongTy, |
| ExistingProtocols.size())); |
| ProtocolElements.push_back(ProtocolArray); |
| Elements.push_back(llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolListTy, |
| ProtocolElements, ".objc_protocol_list"), PtrTy)); |
| Categories.push_back(llvm::ConstantExpr::getBitCast( |
| MakeGlobal(llvm::StructType::get(VMContext, PtrToInt8Ty, PtrToInt8Ty, |
| PtrTy, PtrTy, PtrTy, NULL), Elements), PtrTy)); |
| } |
| |
| 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(MakeConstantString(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(MakeConstantString(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)); |
| } |
| |
| llvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID, |
| llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| llvm::SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) { |
| ASTContext &Context = CGM.getContext(); |
| // |
| // Property metadata: name, attributes, isSynthesized, setter name, setter |
| // types, getter name, getter types. |
| llvm::StructType *PropertyMetadataTy = llvm::StructType::get(VMContext, |
| PtrToInt8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, |
| PtrToInt8Ty, NULL); |
| std::vector<llvm::Constant*> Properties; |
| |
| |
| // Add all of the property methods need adding to the method list and to the |
| // property metadata list. |
| for (ObjCImplDecl::propimpl_iterator |
| iter = OID->propimpl_begin(), endIter = OID->propimpl_end(); |
| iter != endIter ; iter++) { |
| std::vector<llvm::Constant*> Fields; |
| ObjCPropertyDecl *property = (*iter)->getPropertyDecl(); |
| |
| Fields.push_back(MakeConstantString(property->getNameAsString())); |
| Fields.push_back(llvm::ConstantInt::get(Int8Ty, |
| property->getPropertyAttributes())); |
| Fields.push_back(llvm::ConstantInt::get(Int8Ty, |
| (*iter)->getPropertyImplementation() == |
| ObjCPropertyImplDecl::Synthesize)); |
| if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) { |
| InstanceMethodSels.push_back(getter->getSelector()); |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(getter,TypeStr); |
| llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); |
| InstanceMethodTypes.push_back(TypeEncoding); |
| Fields.push_back(MakeConstantString(getter->getSelector().getAsString())); |
| Fields.push_back(TypeEncoding); |
| } else { |
| Fields.push_back(NULLPtr); |
| Fields.push_back(NULLPtr); |
| } |
| if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) { |
| InstanceMethodSels.push_back(setter->getSelector()); |
| std::string TypeStr; |
| Context.getObjCEncodingForMethodDecl(setter,TypeStr); |
| llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); |
| InstanceMethodTypes.push_back(TypeEncoding); |
| Fields.push_back(MakeConstantString(setter->getSelector().getAsString())); |
| Fields.push_back(TypeEncoding); |
| } else { |
| Fields.push_back(NULLPtr); |
| Fields.push_back(NULLPtr); |
| } |
| Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields)); |
| } |
| llvm::ArrayType *PropertyArrayTy = |
| llvm::ArrayType::get(PropertyMetadataTy, Properties.size()); |
| llvm::Constant *PropertyArray = llvm::ConstantArray::get(PropertyArrayTy, |
| Properties); |
| llvm::Constant* PropertyListInitFields[] = |
| {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray}; |
| |
| llvm::Constant *PropertyListInit = |
| llvm::ConstantStruct::get(VMContext, PropertyListInitFields, 3, false); |
| return new llvm::GlobalVariable(TheModule, PropertyListInit->getType(), false, |
| llvm::GlobalValue::InternalLinkage, PropertyListInit, |
| ".objc_property_list"); |
| } |
| |
| 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; |
| |
| std::vector<llvm::Constant*> IvarOffsetValues; |
| |
| 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(MakeConstantString((*iter)->getNameAsString())); |
| // Get the type encoding for this ivar |
| std::string TypeStr; |
| Context.getObjCEncodingForType((*iter)->getType(), TypeStr); |
| IvarTypes.push_back(MakeConstantString(TypeStr)); |
| // Get the offset |
| uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, ClassDecl, *iter); |
| uint64_t Offset = BaseOffset; |
| if (CGM.getContext().getLangOptions().ObjCNonFragileABI) { |
| Offset = BaseOffset - superInstanceSize; |
| } |
| IvarOffsets.push_back( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Offset)); |
| IvarOffsetValues.push_back(new llvm::GlobalVariable(TheModule, IntTy, |
| false, llvm::GlobalValue::ExternalLinkage, |
| llvm::ConstantInt::get(IntTy, BaseOffset), |
| "__objc_ivar_offset_value_" + ClassName +"." + |
| (*iter)->getNameAsString())); |
| } |
| llvm::Constant *IvarOffsetArrayInit = |
| llvm::ConstantArray::get(llvm::ArrayType::get(PtrToIntTy, |
| IvarOffsetValues.size()), IvarOffsetValues); |
| llvm::GlobalVariable *IvarOffsetArray = new llvm::GlobalVariable(TheModule, |
| IvarOffsetArrayInit->getType(), false, |
| llvm::GlobalValue::InternalLinkage, IvarOffsetArrayInit, |
| ".ivar.offsets"); |
| |
| // 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(MakeConstantString(TypeStr)); |
| } |
| |
| llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels, |
| InstanceMethodTypes); |
| |
| |
| // 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(MakeConstantString(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); |
| // Irrespective of whether we are compiling for a fragile or non-fragile ABI, |
| // we emit a symbol containing the offset for each ivar in the class. This |
| // allows code compiled for the non-Fragile ABI to inherit from code compiled |
| // for the legacy ABI, without causing problems. The converse is also |
| // possible, but causes all ivar accesses to be fragile. |
| int i = 0; |
| // Offset pointer for getting at the correct field in the ivar list when |
| // setting up the alias. These are: The base address for the global, the |
| // ivar array (second field), the ivar in this list (set for each ivar), and |
| // the offset (third field in ivar structure) |
| const llvm::Type *IndexTy = llvm::Type::getInt32Ty(VMContext); |
| llvm::Constant *offsetPointerIndexes[] = {Zeros[0], |
| llvm::ConstantInt::get(IndexTy, 1), 0, |
| llvm::ConstantInt::get(IndexTy, 2) }; |
| |
| for (ObjCInterfaceDecl::ivar_iterator iter = ClassDecl->ivar_begin(), |
| endIter = ClassDecl->ivar_end() ; iter != endIter ; iter++) { |
| const std::string Name = "__objc_ivar_offset_" + ClassName + '.' |
| +(*iter)->getNameAsString(); |
| offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, i++); |
| // Get the correct ivar field |
| llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr( |
| IvarList, offsetPointerIndexes, 4); |
| // Get the existing alias, if one exists. |
| llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name); |
| if (offset) { |
| offset->setInitializer(offsetValue); |
| // If this is the real definition, change its linkage type so that |
| // different modules will use this one, rather than their private |
| // copy. |
| offset->setLinkage(llvm::GlobalValue::ExternalLinkage); |
| } else { |
| // Add a new alias if there isn't one already. |
| offset = new llvm::GlobalVariable(TheModule, offsetValue->getType(), |
| false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name); |
| } |
| } |
| //Generate metaclass for class methods |
| llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr, |
| NULLPtr, 0x12L, ClassName.c_str(), 0, Zeros[0], GenerateIvarList( |
| empty, empty, empty), ClassMethodList, NULLPtr, NULLPtr, NULLPtr); |
| |
| // Generate the class structure |
| llvm::Constant *ClassStruct = |
| GenerateClassStructure(MetaClassStruct, SuperClass, 0x11L, |
| ClassName.c_str(), 0, |
| llvm::ConstantInt::get(LongTy, instanceSize), IvarList, |
| MethodList, GenerateProtocolList(Protocols), IvarOffsetArray, |
| Properties); |
| |
| // 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; |
| |
| // Add all referenced protocols to a category. |
| GenerateProtocolHolderCategory(); |
| |
| 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); |
| |
| llvm::StringRef StringClass = CGM.getLangOptions().ObjCConstantStringClass; |
| if (StringClass.empty()) StringClass = "NXConstantString"; |
| Elements.push_back(MakeConstantString(StringClass, |
| ".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(ExportUniqueString(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( |
| ExportUniqueString(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(&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<CanQualType,1> Params; |
| Params.push_back(ASTIdTy); |
| const llvm::FunctionType *FTy = |
| Types.GetFunctionType(Types.getFunctionInfo(Ctx.VoidTy, Params, |
| CC_Default, false), 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"); |
| |
| 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"); |
| |
| // @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::Value *llvm_eh_exception = |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_exception); |
| llvm::Value *llvm_eh_selector = |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_selector); |
| llvm::Value *llvm_eh_typeid_for = |
| CGF.CGM.getIntrinsic(llvm::Intrinsic::eh_typeid_for); |
| |
| // 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()->getAs<ObjCObjectPointerType>(); |
| assert(OPT && "Invalid @catch type."); |
| const ObjCInterfaceType *IT = |
| OPT->getPointeeType()->getAs<ObjCInterfaceType>(); |
| 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); |
| // If there is a @catch or @finally clause in outside of this one then we |
| // need to make sure that we catch and rethrow it. |
| if (PrevLandingPad) { |
| ESelArgs.push_back(NULLPtr); |
| } else { |
| 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); |
| |
| llvm::Value *ExceptionObject = CGF.Builder.CreateLoad(RethrowPtr); |
| llvm::BasicBlock *UnwindBB = CGF.getInvokeDest(); |
| if (!UnwindBB) { |
| CGF.Builder.CreateCall(RethrowFn, ExceptionObject); |
| // Exception always thrown, next instruction is never reached. |
| CGF.Builder.CreateUnreachable(); |
| } else { |
| // If there is a @catch block outside this scope, we invoke instead of |
| // calling because we may return to this function. This is very slow, but |
| // some people still do it. It would be nice to add an optimised path for |
| // this. |
| CGF.Builder.CreateInvoke(RethrowFn, UnwindBB, UnwindBB, &ExceptionObject, |
| &ExceptionObject+1); |
| } |
| |
| 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) { |
| CGBuilderTy B = CGF.Builder; |
| AddrWeakObj = EnforceType(B, AddrWeakObj, IdTy); |
| return B.CreateCall(WeakReadFn, AddrWeakObj); |
| } |
| |
| void CGObjCGNU::EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) { |
| CGBuilderTy B = CGF.Builder; |
| src = EnforceType(B, src, IdTy); |
| dst = EnforceType(B, dst, PtrToIdTy); |
| B.CreateCall2(WeakAssignFn, src, dst); |
| } |
| |
| void CGObjCGNU::EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) { |
| CGBuilderTy B = CGF.Builder; |
| src = EnforceType(B, src, IdTy); |
| dst = EnforceType(B, dst, PtrToIdTy); |
| B.CreateCall2(GlobalAssignFn, src, dst); |
| } |
| |
| void CGObjCGNU::EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst, |
| llvm::Value *ivarOffset) { |
| CGBuilderTy B = CGF.Builder; |
| src = EnforceType(B, src, IdTy); |
| dst = EnforceType(B, dst, PtrToIdTy); |
| B.CreateCall3(IvarAssignFn, src, dst, ivarOffset); |
| } |
| |
| void CGObjCGNU::EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst) { |
| CGBuilderTy B = CGF.Builder; |
| src = EnforceType(B, src, IdTy); |
| dst = EnforceType(B, dst, PtrToIdTy); |
| B.CreateCall2(StrongCastAssignFn, src, dst); |
| } |
| |
| void CGObjCGNU::EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF, |
| llvm::Value *DestPtr, |
| llvm::Value *SrcPtr, |
| QualType Ty) { |
| CGBuilderTy B = CGF.Builder; |
| DestPtr = EnforceType(B, DestPtr, IdTy); |
| SrcPtr = EnforceType(B, SrcPtr, PtrToIdTy); |
| |
| std::pair<uint64_t, unsigned> TypeInfo = CGM.getContext().getTypeInfo(Ty); |
| unsigned long size = TypeInfo.first/8; |
| // FIXME: size_t |
| llvm::Value *N = llvm::ConstantInt::get(LongTy, size); |
| |
| B.CreateCall3(MemMoveFn, DestPtr, SrcPtr, N); |
| } |
| |
| 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 *IvarOffsetPointer = TheModule.getNamedGlobal(Name); |
| if (!IvarOffsetPointer) { |
| uint64_t Offset = ComputeIvarBaseOffset(CGM, ID, Ivar); |
| llvm::ConstantInt *OffsetGuess = |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), Offset, "ivar"); |
| // Don't emit the guess in non-PIC code because the linker will not be able |
| // to replace it with the real version for a library. In non-PIC code you |
| // must compile with the fragile ABI if you want to use ivars from a |
| // GCC-compiled class. |
| if (CGM.getLangOptions().PICLevel) { |
| llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule, |
| llvm::Type::getInt32Ty(VMContext), false, |
| llvm::GlobalValue::PrivateLinkage, OffsetGuess, Name+".guess"); |
| IvarOffsetPointer = new llvm::GlobalVariable(TheModule, |
| IvarOffsetGV->getType(), false, llvm::GlobalValue::LinkOnceAnyLinkage, |
| IvarOffsetGV, Name); |
| } else { |
| IvarOffsetPointer = new llvm::GlobalVariable(TheModule, |
| llvm::Type::getInt32PtrTy(VMContext), false, |
| llvm::GlobalValue::ExternalLinkage, 0, Name); |
| } |
| } |
| return IvarOffsetPointer; |
| } |
| |
| LValue CGObjCGNU::EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF, |
| QualType ObjectTy, |
| llvm::Value *BaseValue, |
| const ObjCIvarDecl *Ivar, |
| unsigned CVRQualifiers) { |
| const ObjCInterfaceDecl *ID = ObjectTy->getAs<ObjCInterfaceType>()->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 (CGM.getLangOptions().ObjCNonFragileABI) { |
| Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar); |
| return CGF.Builder.CreateLoad(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); |
| } |