| //===------- 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 "clang/AST/ASTContext.h" |
| #include "llvm/Module.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/IRBuilder.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringMap.h" |
| #include <map> |
| using namespace clang; |
| 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 ProtocolVersion = 2; |
| |
| namespace { |
| class CGObjCGNU : public CodeGen::CGObjCRuntime { |
| private: |
| CodeGen::CodeGenModule &CGM; |
| llvm::Module &TheModule; |
| const llvm::StructType *SelStructTy; |
| const llvm::Type *SelectorTy; |
| const llvm::Type *PtrToInt8Ty; |
| const llvm::Type *IMPTy; |
| const llvm::Type *IdTy; |
| const llvm::Type *IntTy; |
| const llvm::Type *PtrTy; |
| const llvm::Type *LongTy; |
| const llvm::Type *PtrToIntTy; |
| 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; |
| 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 *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=""); |
| public: |
| CGObjCGNU(CodeGen::CodeGenModule &cgm); |
| virtual llvm::Constant *GenerateConstantString(const char *String, |
| const size_t length); |
| virtual llvm::Value *GenerateMessageSend(llvm::IRBuilder &Builder, |
| const llvm::Type *ReturnTy, |
| llvm::Value *Sender, |
| llvm::Value *Receiver, |
| Selector Sel, |
| llvm::Value** ArgV, |
| unsigned ArgC); |
| virtual llvm::Value *GenerateMessageSendSuper(llvm::IRBuilder &Builder, |
| const llvm::Type *ReturnTy, |
| llvm::Value *Sender, |
| const char *SuperClassName, |
| llvm::Value *Receiver, |
| Selector Sel, |
| llvm::Value** ArgV, |
| unsigned ArgC); |
| virtual llvm::Value *LookupClass(llvm::IRBuilder &Builder, |
| llvm::Value *ClassName); |
| virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder, Selector Sel); |
| |
| virtual llvm::Function *MethodPreamble( |
| const std::string &ClassName, |
| const std::string &CategoryName, |
| const std::string &MethodName, |
| const llvm::Type *ReturnTy, |
| const llvm::Type *SelfTy, |
| const llvm::Type **ArgTy, |
| unsigned ArgC, |
| bool isClassMethod, |
| bool isVarArg); |
| virtual void GenerateCategory(const char *ClassName, const char *CategoryName, |
| const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| const llvm::SmallVectorImpl<std::string> &Protocols); |
| virtual void GenerateClass( |
| const char *ClassName, |
| const char *SuperClassName, |
| const int instanceSize, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets, |
| const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| const llvm::SmallVectorImpl<std::string> &Protocols); |
| virtual llvm::Value *GenerateProtocolRef(llvm::IRBuilder &Builder, const char |
| *ProtocolName); |
| virtual void GenerateProtocol(const char *ProtocolName, |
| const llvm::SmallVectorImpl<std::string> &Protocols, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes); |
| virtual llvm::Function *ModuleInitFunction(); |
| }; |
| } // end anonymous namespace |
| |
| |
| |
| 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()) { |
| IntTy = CGM.getTypes().ConvertType(CGM.getContext().IntTy); |
| LongTy = CGM.getTypes().ConvertType(CGM.getContext().LongTy); |
| |
| Zeros[0] = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0); |
| Zeros[1] = Zeros[0]; |
| NULLPtr = llvm::ConstantPointerNull::get( |
| llvm::PointerType::getUnqual(llvm::Type::Int8Ty)); |
| // C string type. Used in lots of places. |
| PtrToInt8Ty = |
| llvm::PointerType::getUnqual(llvm::Type::Int8Ty); |
| // Get the selector Type. |
| SelStructTy = llvm::StructType::get( |
| PtrToInt8Ty, |
| PtrToInt8Ty, |
| NULL); |
| SelectorTy = llvm::PointerType::getUnqual(SelStructTy); |
| PtrToIntTy = llvm::PointerType::getUnqual(IntTy); |
| PtrTy = PtrToInt8Ty; |
| |
| // Object type |
| llvm::PATypeHolder OpaqueObjTy = llvm::OpaqueType::get(); |
| llvm::Type *OpaqueIdTy = llvm::PointerType::getUnqual(OpaqueObjTy); |
| IdTy = llvm::StructType::get(OpaqueIdTy, NULL); |
| llvm::cast<llvm::OpaqueType>(OpaqueObjTy.get())->refineAbstractTypeTo(IdTy); |
| IdTy = llvm::cast<llvm::StructType>(OpaqueObjTy.get()); |
| IdTy = 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); |
| } |
| // This has to perform the lookup every time, since posing and related |
| // techniques can modify the name -> class mapping. |
| llvm::Value *CGObjCGNU::LookupClass(llvm::IRBuilder &Builder, |
| llvm::Value *ClassName) { |
| llvm::Constant *ClassLookupFn = |
| TheModule.getOrInsertFunction("objc_lookup_class", IdTy, PtrToInt8Ty, |
| NULL); |
| return Builder.CreateCall(ClassLookupFn, ClassName); |
| } |
| |
| /// GetSelector - Return the pointer to the unique'd string for this selector. |
| llvm::Value *CGObjCGNU::GetSelector(llvm::IRBuilder &Builder, Selector Sel) { |
| // FIXME: uniquing on the string is wasteful, unique on Sel instead! |
| llvm::GlobalAlias *&US = UntypedSelectors[Sel.getName()]; |
| if (US == 0) |
| US = new llvm::GlobalAlias(llvm::PointerType::getUnqual(SelectorTy), |
| llvm::GlobalValue::InternalLinkage, |
| ".objc_untyped_selector_alias", |
| NULL, &TheModule); |
| |
| return Builder.CreateLoad(US); |
| |
| } |
| |
| llvm::Constant *CGObjCGNU::MakeConstantString(const std::string &Str, |
| const std::string &Name) { |
| llvm::Constant * ConstStr = llvm::ConstantArray::get(Str); |
| ConstStr = new llvm::GlobalVariable(ConstStr->getType(), true, |
| llvm::GlobalValue::InternalLinkage, |
| ConstStr, Name, &TheModule); |
| 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(Ty, false, |
| llvm::GlobalValue::InternalLinkage, C, Name, &TheModule); |
| } |
| 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(Ty, false, |
| llvm::GlobalValue::InternalLinkage, C, Name, &TheModule); |
| } |
| |
| /// 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 char *String, const |
| size_t length) { |
| std::string Str(String, String +length); |
| std::vector<llvm::Constant*> Ivars; |
| Ivars.push_back(NULLPtr); |
| Ivars.push_back(MakeConstantString(Str)); |
| Ivars.push_back(llvm::ConstantInt::get(IntTy, length)); |
| llvm::Constant *ObjCStr = MakeGlobal( |
| llvm::StructType::get(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. |
| llvm::Value *CGObjCGNU::GenerateMessageSendSuper(llvm::IRBuilder &Builder, |
| const llvm::Type *ReturnTy, |
| llvm::Value *Sender, |
| const char *SuperClassName, |
| llvm::Value *Receiver, |
| Selector Sel, |
| llvm::Value** ArgV, |
| unsigned ArgC) { |
| // TODO: This should be cached, not looked up every time. |
| llvm::Value *ReceiverClass = LookupClass(Builder, |
| MakeConstantString(SuperClassName)); |
| llvm::Value *cmd = GetSelector(Builder, Sel); |
| std::vector<const llvm::Type*> impArgTypes; |
| impArgTypes.push_back(Receiver->getType()); |
| impArgTypes.push_back(SelectorTy); |
| |
| // Avoid an explicit cast on the IMP by getting a version that has the right |
| // return type. |
| llvm::FunctionType *impType = llvm::FunctionType::get(ReturnTy, impArgTypes, |
| true); |
| // Construct the structure used to look up the IMP |
| llvm::StructType *ObjCSuperTy = llvm::StructType::get(Receiver->getType(), |
| IdTy, NULL); |
| llvm::Value *ObjCSuper = Builder.CreateAlloca(ObjCSuperTy); |
| // FIXME: volatility |
| Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0)); |
| Builder.CreateStore(ReceiverClass, Builder.CreateStructGEP(ObjCSuper, 1)); |
| |
| // Get the IMP |
| llvm::Constant *lookupFunction = |
| TheModule.getOrInsertFunction("objc_msg_lookup_super", |
| llvm::PointerType::getUnqual(impType), |
| llvm::PointerType::getUnqual(ObjCSuperTy), |
| SelectorTy, NULL); |
| llvm::Value *lookupArgs[] = {ObjCSuper, cmd}; |
| llvm::Value *imp = Builder.CreateCall(lookupFunction, lookupArgs, |
| lookupArgs+2); |
| |
| // Call the method |
| llvm::SmallVector<llvm::Value*, 8> callArgs; |
| callArgs.push_back(Receiver); |
| callArgs.push_back(cmd); |
| callArgs.insert(callArgs.end(), ArgV, ArgV+ArgC); |
| return Builder.CreateCall(imp, callArgs.begin(), callArgs.end()); |
| } |
| |
| /// Generate code for a message send expression. |
| llvm::Value *CGObjCGNU::GenerateMessageSend(llvm::IRBuilder &Builder, |
| const llvm::Type *ReturnTy, |
| llvm::Value *Sender, |
| llvm::Value *Receiver, |
| Selector Sel, |
| llvm::Value** ArgV, |
| unsigned ArgC) { |
| llvm::Value *cmd = GetSelector(Builder, Sel); |
| |
| // Look up the method implementation. |
| std::vector<const llvm::Type*> impArgTypes; |
| const llvm::Type *RetTy; |
| //TODO: Revisit this when LLVM supports aggregate return types. |
| if (ReturnTy->isSingleValueType() && ReturnTy != llvm::Type::VoidTy) { |
| RetTy = ReturnTy; |
| } else { |
| // For struct returns allocate the space in the caller and pass it up to |
| // the sender. |
| RetTy = llvm::Type::VoidTy; |
| impArgTypes.push_back(llvm::PointerType::getUnqual(ReturnTy)); |
| } |
| impArgTypes.push_back(Receiver->getType()); |
| impArgTypes.push_back(SelectorTy); |
| |
| // Avoid an explicit cast on the IMP by getting a version that has the right |
| // return type. |
| llvm::FunctionType *impType = llvm::FunctionType::get(RetTy, impArgTypes, |
| true); |
| |
| llvm::Constant *lookupFunction = |
| TheModule.getOrInsertFunction("objc_msg_lookup", |
| llvm::PointerType::getUnqual(impType), |
| Receiver->getType(), SelectorTy, NULL); |
| llvm::Value *imp = Builder.CreateCall2(lookupFunction, Receiver, cmd); |
| |
| // Call the method. |
| llvm::SmallVector<llvm::Value*, 16> Args; |
| if (!ReturnTy->isSingleValueType()) { |
| llvm::Value *Return = Builder.CreateAlloca(ReturnTy); |
| Args.push_back(Return); |
| } |
| Args.push_back(Receiver); |
| Args.push_back(cmd); |
| Args.insert(Args.end(), ArgV, ArgV+ArgC); |
| if (!ReturnTy->isSingleValueType()) { |
| Builder.CreateCall(imp, Args.begin(), Args.end()); |
| return Args[0]; |
| } |
| return Builder.CreateCall(imp, Args.begin(), Args.end()); |
| } |
| |
| /// 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) { |
| // Get the method structure type. |
| llvm::StructType *ObjCMethodTy = llvm::StructType::get( |
| 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(); |
| llvm::Constant *C = CGM.GetAddrOfConstantString(MethodSels[i].getName()); |
| Elements.push_back(llvm::ConstantExpr::getGetElementPtr(C, Zeros, 2)); |
| Elements.push_back( |
| llvm::ConstantExpr::getGetElementPtr(MethodTypes[i], Zeros, 2)); |
| llvm::Constant *Method = |
| TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName, |
| MethodSels[i].getName(), |
| isClassMethodList)); |
| 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, |
| MethodSels.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(); |
| llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(OpaqueNextTy); |
| llvm::StructType *ObjCMethodListTy = llvm::StructType::get(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::Int32Ty, |
| 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( |
| 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( |
| llvm::cast<llvm::IntegerType>(IntTy), (int)IvarNames.size())); |
| Elements.push_back(llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars)); |
| // Structure containing array and array count |
| llvm::StructType *ObjCIvarListTy = llvm::StructType::get(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( |
| 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(llvm::cast<llvm::PointerType>(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( |
| 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( |
| 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( |
| 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 *Ptr = |
| llvm::ConstantExpr::getBitCast(ExistingProtocols[*iter], 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( |
| llvm::cast<llvm::IntegerType>(LongTy), Protocols.size())); |
| Elements.push_back(ProtocolArray); |
| return MakeGlobal(ProtocolListTy, Elements, ".objc_protocol_list"); |
| } |
| |
| llvm::Value *CGObjCGNU::GenerateProtocolRef(llvm::IRBuilder &Builder, const |
| char *ProtocolName) { |
| return ExistingProtocols[ProtocolName]; |
| } |
| |
| void CGObjCGNU::GenerateProtocol(const char *ProtocolName, |
| const llvm::SmallVectorImpl<std::string> &Protocols, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes) { |
| |
| 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(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::Int32Ty, 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 char *ClassName, |
| const char *CategoryName, |
| const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| const llvm::SmallVectorImpl<std::string> &Protocols) { |
| 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(PtrToInt8Ty, PtrToInt8Ty, PtrTy, |
| PtrTy, PtrTy, NULL), Elements), PtrTy)); |
| } |
| void CGObjCGNU::GenerateClass( |
| const char *ClassName, |
| const char *SuperClassName, |
| const int instanceSize, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets, |
| const llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes, |
| const llvm::SmallVectorImpl<Selector> &ClassMethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes, |
| const llvm::SmallVectorImpl<std::string> &Protocols) { |
| // Get the superclass pointer. |
| llvm::Constant *SuperClass; |
| if (SuperClassName) { |
| SuperClass = MakeConstantString(SuperClassName, ".super_class_name"); |
| } else { |
| SuperClass = llvm::ConstantPointerNull::get( |
| llvm::cast<llvm::PointerType>(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, 0, |
| llvm::ConstantInt::get(llvm::Type::Int32Ty, instanceSize), IvarList, |
| MethodList, GenerateProtocolList(Protocols)); |
| // 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; |
| |
| // Name the ObjC types to make the IR a bit easier to read |
| TheModule.addTypeName(".objc_selector", SelectorTy); |
| TheModule.addTypeName(".objc_id", IdTy); |
| TheModule.addTypeName(".objc_imp", IMPTy); |
| |
| std::vector<llvm::Constant*> Elements; |
| // Generate statics list: |
| 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(PtrToInt8Ty, StaticsArrayTy, NULL); |
| llvm::Type *StaticsListPtrTy = llvm::PointerType::getUnqual(StaticsListTy); |
| llvm::Constant *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(LongTy, SelectorTy, |
| llvm::Type::Int16Ty, |
| llvm::Type::Int16Ty, |
| 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, SelectorTy)); |
| |
| // 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::Int32Ty, index++), Zeros[0]}; |
| llvm::GlobalVariable *SelPtr = new llvm::GlobalVariable(SelectorTy, true, |
| llvm::GlobalValue::InternalLinkage, |
| llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2), |
| ".objc_sel_ptr", &TheModule); |
| (*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::Int32Ty, index++), Zeros[0]}; |
| llvm::GlobalVariable *SelPtr = new llvm::GlobalVariable(SelectorTy, true, |
| llvm::GlobalValue::InternalLinkage, |
| llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2), |
| ".objc_sel_ptr", &TheModule); |
| (*iter).second->setAliasee(SelPtr); |
| } |
| // Number of classes defined. |
| Elements.push_back(llvm::ConstantInt::get(llvm::Type::Int16Ty, |
| Classes.size())); |
| // Number of categories defined |
| Elements.push_back(llvm::ConstantInt::get(llvm::Type::Int16Ty, |
| 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(LongTy, LongTy, |
| PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy), NULL); |
| Elements.clear(); |
| // Runtime version used for compatibility checking. |
| Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion)); |
| //FIXME: Should be sizeof(ModuleTy) |
| Elements.push_back(llvm::ConstantInt::get(LongTy, 16)); |
| //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 |
| std::vector<const llvm::Type*> VoidArgs; |
| llvm::Function * LoadFunction = llvm::Function::Create( |
| llvm::FunctionType::get(llvm::Type::VoidTy, VoidArgs, false), |
| llvm::GlobalValue::InternalLinkage, ".objc_load_function", |
| &TheModule); |
| llvm::BasicBlock *EntryBB = llvm::BasicBlock::Create("entry", LoadFunction); |
| llvm::IRBuilder Builder; |
| Builder.SetInsertPoint(EntryBB); |
| llvm::Value *Register = TheModule.getOrInsertFunction("__objc_exec_class", |
| llvm::Type::VoidTy, llvm::PointerType::getUnqual(ModuleTy), NULL); |
| Builder.CreateCall(Register, Module); |
| Builder.CreateRetVoid(); |
| return LoadFunction; |
| } |
| llvm::Function *CGObjCGNU::MethodPreamble( |
| const std::string &ClassName, |
| const std::string &CategoryName, |
| const std::string &MethodName, |
| const llvm::Type *ReturnTy, |
| const llvm::Type *SelfTy, |
| const llvm::Type **ArgTy, |
| unsigned ArgC, |
| bool isClassMethod, |
| bool isVarArg) { |
| std::vector<const llvm::Type*> Args; |
| if (!ReturnTy->isSingleValueType() && ReturnTy != llvm::Type::VoidTy) { |
| Args.push_back(llvm::PointerType::getUnqual(ReturnTy)); |
| ReturnTy = llvm::Type::VoidTy; |
| } |
| Args.push_back(SelfTy); |
| Args.push_back(SelectorTy); |
| Args.insert(Args.end(), ArgTy, ArgTy+ArgC); |
| |
| llvm::FunctionType *MethodTy = llvm::FunctionType::get(ReturnTy, |
| Args, |
| isVarArg); |
| std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName, |
| MethodName, isClassMethod); |
| |
| llvm::Function *Method = llvm::Function::Create(MethodTy, |
| llvm::GlobalValue::InternalLinkage, |
| FunctionName, |
| &TheModule); |
| llvm::Function::arg_iterator AI = Method->arg_begin(); |
| // Name the struct return argument. |
| // FIXME: This is probably the wrong test. |
| if (!ReturnTy->isFirstClassType() && ReturnTy != llvm::Type::VoidTy) { |
| AI->setName("agg.result"); |
| ++AI; |
| } |
| AI->setName("self"); |
| ++AI; |
| AI->setName("_cmd"); |
| return Method; |
| } |
| |
| CodeGen::CGObjCRuntime *CodeGen::CreateObjCRuntime(CodeGen::CodeGenModule &CGM){ |
| return new CGObjCGNU(CGM); |
| } |