forked from OSchip/llvm-project
2253 lines
93 KiB
C++
2253 lines
93 KiB
C++
//===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This provides Objective-C code generation targetting the GNU runtime. The
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// class in this file generates structures used by the GNU Objective-C runtime
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// library. These structures are defined in objc/objc.h and objc/objc-api.h in
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// the GNU runtime distribution.
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//
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//===----------------------------------------------------------------------===//
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#include "CGObjCRuntime.h"
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#include "CodeGenModule.h"
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#include "CodeGenFunction.h"
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#include "CGException.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/StmtObjC.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Module.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Target/TargetData.h"
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#include <map>
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using namespace clang;
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using namespace CodeGen;
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using llvm::dyn_cast;
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// The version of the runtime that this class targets. Must match the version
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// in the runtime.
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static const int RuntimeVersion = 8;
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static const int NonFragileRuntimeVersion = 9;
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static const int ProtocolVersion = 2;
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static const int NonFragileProtocolVersion = 3;
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namespace {
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class CGObjCGNU : public CodeGen::CGObjCRuntime {
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private:
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CodeGen::CodeGenModule &CGM;
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llvm::Module &TheModule;
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const llvm::PointerType *SelectorTy;
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const llvm::IntegerType *Int8Ty;
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const llvm::PointerType *PtrToInt8Ty;
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const llvm::FunctionType *IMPTy;
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const llvm::PointerType *IdTy;
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const llvm::PointerType *PtrToIdTy;
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CanQualType ASTIdTy;
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const llvm::IntegerType *IntTy;
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const llvm::PointerType *PtrTy;
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const llvm::IntegerType *LongTy;
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const llvm::IntegerType *SizeTy;
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const llvm::IntegerType *PtrDiffTy;
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const llvm::PointerType *PtrToIntTy;
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const llvm::Type *BoolTy;
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llvm::GlobalAlias *ClassPtrAlias;
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llvm::GlobalAlias *MetaClassPtrAlias;
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std::vector<llvm::Constant*> Classes;
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std::vector<llvm::Constant*> Categories;
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std::vector<llvm::Constant*> ConstantStrings;
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llvm::StringMap<llvm::Constant*> ObjCStrings;
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llvm::Function *LoadFunction;
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llvm::StringMap<llvm::Constant*> ExistingProtocols;
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typedef std::pair<std::string, std::string> TypedSelector;
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std::map<TypedSelector, llvm::GlobalAlias*> TypedSelectors;
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llvm::StringMap<llvm::GlobalAlias*> UntypedSelectors;
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// Selectors that we don't emit in GC mode
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Selector RetainSel, ReleaseSel, AutoreleaseSel;
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// Functions used for GC.
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llvm::Constant *IvarAssignFn, *StrongCastAssignFn, *MemMoveFn, *WeakReadFn,
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*WeakAssignFn, *GlobalAssignFn;
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// Some zeros used for GEPs in lots of places.
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llvm::Constant *Zeros[2];
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llvm::Constant *NULLPtr;
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llvm::LLVMContext &VMContext;
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/// Metadata kind used to tie method lookups to message sends.
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unsigned msgSendMDKind;
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private:
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llvm::Constant *GenerateIvarList(
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const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames,
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const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes,
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const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets);
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llvm::Constant *GenerateMethodList(const std::string &ClassName,
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const std::string &CategoryName,
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const llvm::SmallVectorImpl<Selector> &MethodSels,
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const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes,
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bool isClassMethodList);
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llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName);
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llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID,
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llvm::SmallVectorImpl<Selector> &InstanceMethodSels,
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llvm::SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes);
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llvm::Constant *GenerateProtocolList(
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const llvm::SmallVectorImpl<std::string> &Protocols);
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// To ensure that all protocols are seen by the runtime, we add a category on
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// a class defined in the runtime, declaring no methods, but adopting the
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// protocols.
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void GenerateProtocolHolderCategory(void);
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llvm::Constant *GenerateClassStructure(
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llvm::Constant *MetaClass,
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llvm::Constant *SuperClass,
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unsigned info,
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const char *Name,
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llvm::Constant *Version,
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llvm::Constant *InstanceSize,
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llvm::Constant *IVars,
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llvm::Constant *Methods,
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llvm::Constant *Protocols,
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llvm::Constant *IvarOffsets,
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llvm::Constant *Properties,
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bool isMeta=false);
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llvm::Constant *GenerateProtocolMethodList(
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const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
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const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes);
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llvm::Constant *MakeConstantString(const std::string &Str, const std::string
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&Name="");
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llvm::Constant *ExportUniqueString(const std::string &Str, const std::string
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prefix);
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llvm::Constant *MakeGlobal(const llvm::StructType *Ty,
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std::vector<llvm::Constant*> &V, llvm::StringRef Name="",
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llvm::GlobalValue::LinkageTypes linkage=llvm::GlobalValue::InternalLinkage);
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llvm::Constant *MakeGlobal(const llvm::ArrayType *Ty,
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std::vector<llvm::Constant*> &V, llvm::StringRef Name="",
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llvm::GlobalValue::LinkageTypes linkage=llvm::GlobalValue::InternalLinkage);
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llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
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const ObjCIvarDecl *Ivar);
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void EmitClassRef(const std::string &className);
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llvm::Value* EnforceType(CGBuilderTy B, llvm::Value *V, const llvm::Type *Ty){
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if (V->getType() == Ty) return V;
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return B.CreateBitCast(V, Ty);
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}
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public:
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CGObjCGNU(CodeGen::CodeGenModule &cgm);
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virtual llvm::Constant *GenerateConstantString(const StringLiteral *);
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virtual CodeGen::RValue
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GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
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ReturnValueSlot Return,
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QualType ResultType,
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Selector Sel,
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llvm::Value *Receiver,
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const CallArgList &CallArgs,
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const ObjCInterfaceDecl *Class,
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const ObjCMethodDecl *Method);
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virtual CodeGen::RValue
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GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
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ReturnValueSlot Return,
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QualType ResultType,
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Selector Sel,
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const ObjCInterfaceDecl *Class,
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bool isCategoryImpl,
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llvm::Value *Receiver,
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bool IsClassMessage,
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const CallArgList &CallArgs,
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const ObjCMethodDecl *Method);
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virtual llvm::Value *GetClass(CGBuilderTy &Builder,
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const ObjCInterfaceDecl *OID);
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virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel,
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bool lval = false);
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virtual llvm::Value *GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl
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*Method);
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virtual llvm::Constant *GetEHType(QualType T);
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virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
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const ObjCContainerDecl *CD);
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virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD);
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virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl);
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virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder,
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const ObjCProtocolDecl *PD);
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virtual void GenerateProtocol(const ObjCProtocolDecl *PD);
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virtual llvm::Function *ModuleInitFunction();
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virtual llvm::Function *GetPropertyGetFunction();
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virtual llvm::Function *GetPropertySetFunction();
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virtual llvm::Function *GetSetStructFunction();
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virtual llvm::Function *GetGetStructFunction();
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virtual llvm::Constant *EnumerationMutationFunction();
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virtual void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
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const ObjCAtTryStmt &S);
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virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
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const ObjCAtSynchronizedStmt &S);
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virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
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const ObjCAtThrowStmt &S);
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virtual llvm::Value * EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
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llvm::Value *AddrWeakObj);
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virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
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llvm::Value *src, llvm::Value *dst);
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virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
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llvm::Value *src, llvm::Value *dest,
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bool threadlocal=false);
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virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
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llvm::Value *src, llvm::Value *dest,
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llvm::Value *ivarOffset);
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virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
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llvm::Value *src, llvm::Value *dest);
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virtual void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
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llvm::Value *DestPtr,
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llvm::Value *SrcPtr,
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llvm::Value *Size);
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virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF,
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QualType ObjectTy,
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llvm::Value *BaseValue,
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const ObjCIvarDecl *Ivar,
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unsigned CVRQualifiers);
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virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
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const ObjCInterfaceDecl *Interface,
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const ObjCIvarDecl *Ivar);
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virtual llvm::Constant *GCBlockLayout(CodeGen::CodeGenFunction &CGF,
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const llvm::SmallVectorImpl<const Expr *> &) {
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return NULLPtr;
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}
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};
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} // end anonymous namespace
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/// Emits a reference to a dummy variable which is emitted with each class.
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/// This ensures that a linker error will be generated when trying to link
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/// together modules where a referenced class is not defined.
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void CGObjCGNU::EmitClassRef(const std::string &className) {
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std::string symbolRef = "__objc_class_ref_" + className;
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// Don't emit two copies of the same symbol
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if (TheModule.getGlobalVariable(symbolRef))
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return;
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std::string symbolName = "__objc_class_name_" + className;
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llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName);
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if (!ClassSymbol) {
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ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
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llvm::GlobalValue::ExternalLinkage, 0, symbolName);
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}
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new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true,
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llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef);
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}
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static std::string SymbolNameForMethod(const std::string &ClassName, const
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std::string &CategoryName, const std::string &MethodName, bool isClassMethod)
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{
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std::string MethodNameColonStripped = MethodName;
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std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(),
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':', '_');
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return std::string(isClassMethod ? "_c_" : "_i_") + ClassName + "_" +
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CategoryName + "_" + MethodNameColonStripped;
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}
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static std::string MangleSelectorTypes(const std::string &TypeString) {
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std::string Mangled = TypeString;
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// Simple mangling to avoid breaking when we mix JIT / static code.
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// Not part of the ABI, subject to change without notice.
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std::replace(Mangled.begin(), Mangled.end(), '@', '_');
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std::replace(Mangled.begin(), Mangled.end(), ':', 'J');
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std::replace(Mangled.begin(), Mangled.end(), '*', 'e');
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std::replace(Mangled.begin(), Mangled.end(), '#', 'E');
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std::replace(Mangled.begin(), Mangled.end(), ':', 'j');
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std::replace(Mangled.begin(), Mangled.end(), '(', 'g');
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std::replace(Mangled.begin(), Mangled.end(), ')', 'G');
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std::replace(Mangled.begin(), Mangled.end(), '[', 'h');
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std::replace(Mangled.begin(), Mangled.end(), ']', 'H');
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return Mangled;
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}
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CGObjCGNU::CGObjCGNU(CodeGen::CodeGenModule &cgm)
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: CGM(cgm), TheModule(CGM.getModule()), ClassPtrAlias(0),
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MetaClassPtrAlias(0), VMContext(cgm.getLLVMContext()) {
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msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend");
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IntTy = cast<llvm::IntegerType>(
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CGM.getTypes().ConvertType(CGM.getContext().IntTy));
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LongTy = cast<llvm::IntegerType>(
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CGM.getTypes().ConvertType(CGM.getContext().LongTy));
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SizeTy = cast<llvm::IntegerType>(
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CGM.getTypes().ConvertType(CGM.getContext().getSizeType()));
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PtrDiffTy = cast<llvm::IntegerType>(
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CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType()));
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BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy);
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Int8Ty = llvm::Type::getInt8Ty(VMContext);
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// C string type. Used in lots of places.
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PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty);
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Zeros[0] = llvm::ConstantInt::get(LongTy, 0);
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Zeros[1] = Zeros[0];
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NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty);
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// Get the selector Type.
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QualType selTy = CGM.getContext().getObjCSelType();
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if (QualType() == selTy) {
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SelectorTy = PtrToInt8Ty;
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} else {
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SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy));
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}
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PtrToIntTy = llvm::PointerType::getUnqual(IntTy);
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PtrTy = PtrToInt8Ty;
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// Object type
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ASTIdTy = CGM.getContext().getCanonicalType(CGM.getContext().getObjCIdType());
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if (QualType() == ASTIdTy) {
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IdTy = PtrToInt8Ty;
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} else {
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IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
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}
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PtrToIdTy = llvm::PointerType::getUnqual(IdTy);
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// IMP type
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std::vector<const llvm::Type*> IMPArgs;
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IMPArgs.push_back(IdTy);
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IMPArgs.push_back(SelectorTy);
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IMPTy = llvm::FunctionType::get(IdTy, IMPArgs, true);
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if (CGM.getLangOptions().getGCMode() != LangOptions::NonGC) {
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// Get selectors needed in GC mode
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RetainSel = GetNullarySelector("retain", CGM.getContext());
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ReleaseSel = GetNullarySelector("release", CGM.getContext());
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AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext());
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// Get functions needed in GC mode
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// id objc_assign_ivar(id, id, ptrdiff_t);
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std::vector<const llvm::Type*> Args(1, IdTy);
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Args.push_back(PtrToIdTy);
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Args.push_back(PtrDiffTy);
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llvm::FunctionType *FTy = llvm::FunctionType::get(IdTy, Args, false);
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IvarAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_ivar");
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// id objc_assign_strongCast (id, id*)
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Args.pop_back();
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FTy = llvm::FunctionType::get(IdTy, Args, false);
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StrongCastAssignFn =
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CGM.CreateRuntimeFunction(FTy, "objc_assign_strongCast");
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// id objc_assign_global(id, id*);
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FTy = llvm::FunctionType::get(IdTy, Args, false);
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GlobalAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_global");
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// id objc_assign_weak(id, id*);
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FTy = llvm::FunctionType::get(IdTy, Args, false);
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WeakAssignFn = CGM.CreateRuntimeFunction(FTy, "objc_assign_weak");
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// id objc_read_weak(id*);
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Args.clear();
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Args.push_back(PtrToIdTy);
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FTy = llvm::FunctionType::get(IdTy, Args, false);
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WeakReadFn = CGM.CreateRuntimeFunction(FTy, "objc_read_weak");
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// void *objc_memmove_collectable(void*, void *, size_t);
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Args.clear();
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Args.push_back(PtrToInt8Ty);
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Args.push_back(PtrToInt8Ty);
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Args.push_back(SizeTy);
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FTy = llvm::FunctionType::get(IdTy, Args, false);
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MemMoveFn = CGM.CreateRuntimeFunction(FTy, "objc_memmove_collectable");
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}
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}
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// This has to perform the lookup every time, since posing and related
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// techniques can modify the name -> class mapping.
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llvm::Value *CGObjCGNU::GetClass(CGBuilderTy &Builder,
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const ObjCInterfaceDecl *OID) {
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llvm::Value *ClassName = CGM.GetAddrOfConstantCString(OID->getNameAsString());
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// With the incompatible ABI, this will need to be replaced with a direct
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// reference to the class symbol. For the compatible nonfragile ABI we are
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// still performing this lookup at run time but emitting the symbol for the
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// class externally so that we can make the switch later.
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EmitClassRef(OID->getNameAsString());
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ClassName = Builder.CreateStructGEP(ClassName, 0);
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std::vector<const llvm::Type*> Params(1, PtrToInt8Ty);
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llvm::Constant *ClassLookupFn =
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CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy,
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Params,
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true),
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"objc_lookup_class");
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return Builder.CreateCall(ClassLookupFn, ClassName);
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}
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llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel,
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bool lval) {
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llvm::GlobalAlias *&US = UntypedSelectors[Sel.getAsString()];
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if (US == 0)
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US = new llvm::GlobalAlias(llvm::PointerType::getUnqual(SelectorTy),
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llvm::GlobalValue::PrivateLinkage,
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".objc_untyped_selector_alias"+Sel.getAsString(),
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NULL, &TheModule);
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if (lval)
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return US;
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return Builder.CreateLoad(US);
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}
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llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl
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*Method) {
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std::string SelName = Method->getSelector().getAsString();
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std::string SelTypes;
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CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes);
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// Typed selectors
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TypedSelector Selector = TypedSelector(SelName,
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SelTypes);
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// If it's already cached, return it.
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if (TypedSelectors[Selector]) {
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return Builder.CreateLoad(TypedSelectors[Selector]);
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}
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// If it isn't, cache it.
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llvm::GlobalAlias *Sel = new llvm::GlobalAlias(
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llvm::PointerType::getUnqual(SelectorTy),
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llvm::GlobalValue::PrivateLinkage, ".objc_selector_alias" + SelName,
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NULL, &TheModule);
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TypedSelectors[Selector] = Sel;
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return Builder.CreateLoad(Sel);
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}
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llvm::Constant *CGObjCGNU::GetEHType(QualType T) {
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llvm_unreachable("asking for catch type for ObjC type in GNU runtime");
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return 0;
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}
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llvm::Constant *CGObjCGNU::MakeConstantString(const std::string &Str,
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const std::string &Name) {
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llvm::Constant *ConstStr = CGM.GetAddrOfConstantCString(Str, Name.c_str());
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return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2);
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}
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llvm::Constant *CGObjCGNU::ExportUniqueString(const std::string &Str,
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const std::string prefix) {
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std::string name = prefix + Str;
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llvm::Constant *ConstStr = TheModule.getGlobalVariable(name);
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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,
|
|
linkage, 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,
|
|
linkage, C, Name);
|
|
}
|
|
|
|
/// Generate an NSConstantString object.
|
|
llvm::Constant *CGObjCGNU::GenerateConstantString(const StringLiteral *SL) {
|
|
|
|
std::string Str = SL->getString().str();
|
|
|
|
// 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,
|
|
ReturnValueSlot Return,
|
|
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);
|
|
}
|
|
}
|
|
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *cmd = GetSelector(Builder, Sel);
|
|
|
|
|
|
CallArgList ActualArgs;
|
|
|
|
ActualArgs.push_back(
|
|
std::make_pair(RValue::get(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,
|
|
FunctionType::ExtInfo());
|
|
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 = 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 = Builder.CreateBitCast(ReceiverClass,
|
|
llvm::PointerType::getUnqual(
|
|
llvm::StructType::get(VMContext, IdTy, IdTy, NULL)));
|
|
// Get the superclass pointer
|
|
ReceiverClass = Builder.CreateStructGEP(ReceiverClass, 1);
|
|
// Load the superclass pointer
|
|
ReceiverClass = 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 = Builder.CreateAlloca(ObjCSuperTy);
|
|
|
|
Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0));
|
|
Builder.CreateStore(ReceiverClass, 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::Value *lookupArgs[] = {ObjCSuper, cmd};
|
|
llvm::Value *imp;
|
|
|
|
if (CGM.getContext().getLangOptions().ObjCNonFragileABI) {
|
|
// 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_slot_lookup_super");
|
|
|
|
llvm::CallInst *slot = Builder.CreateCall(lookupFunction, lookupArgs,
|
|
lookupArgs+2);
|
|
slot->setOnlyReadsMemory();
|
|
|
|
imp = Builder.CreateLoad(Builder.CreateStructGEP(slot, 4));
|
|
} else {
|
|
llvm::Constant *lookupFunction =
|
|
CGM.CreateRuntimeFunction(llvm::FunctionType::get(
|
|
llvm::PointerType::getUnqual(impType), Params, true),
|
|
"objc_msg_lookup_super");
|
|
imp = Builder.CreateCall(lookupFunction, lookupArgs, lookupArgs+2);
|
|
}
|
|
|
|
llvm::Value *impMD[] = {
|
|
llvm::MDString::get(VMContext, Sel.getAsString()),
|
|
llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()),
|
|
llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), IsClassMessage)
|
|
};
|
|
llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD, 3);
|
|
|
|
llvm::Instruction *call;
|
|
RValue msgRet = CGF.EmitCall(FnInfo, imp, Return, ActualArgs,
|
|
0, &call);
|
|
call->setMetadata(msgSendMDKind, node);
|
|
return msgRet;
|
|
}
|
|
|
|
/// Generate code for a message send expression.
|
|
CodeGen::RValue
|
|
CGObjCGNU::GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
|
|
ReturnValueSlot Return,
|
|
QualType ResultType,
|
|
Selector Sel,
|
|
llvm::Value *Receiver,
|
|
const CallArgList &CallArgs,
|
|
const ObjCInterfaceDecl *Class,
|
|
const ObjCMethodDecl *Method) {
|
|
// Strip out message sends to retain / release in GC mode
|
|
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;
|
|
|
|
// If the return type is something that goes in an integer register, the
|
|
// runtime will handle 0 returns. For other cases, we fill in the 0 value
|
|
// ourselves.
|
|
//
|
|
// The language spec says the result of this kind of message send is
|
|
// undefined, but lots of people seem to have forgotten to read that
|
|
// paragraph and insist on sending messages to nil that have structure
|
|
// returns. With GCC, this generates a random return value (whatever happens
|
|
// to be on the stack / in those registers at the time) on most platforms,
|
|
// and generates a SegV on SPARC. With LLVM it corrupts the stack.
|
|
bool isPointerSizedReturn = false;
|
|
if (ResultType->isAnyPointerType() ||
|
|
ResultType->isIntegralOrEnumerationType() || ResultType->isVoidType())
|
|
isPointerSizedReturn = true;
|
|
|
|
llvm::BasicBlock *startBB = 0;
|
|
llvm::BasicBlock *messageBB = 0;
|
|
llvm::BasicBlock *continueBB = 0;
|
|
|
|
if (!isPointerSizedReturn) {
|
|
startBB = Builder.GetInsertBlock();
|
|
messageBB = CGF.createBasicBlock("msgSend");
|
|
continueBB = CGF.createBasicBlock("continue");
|
|
|
|
llvm::Value *isNil = Builder.CreateICmpEQ(Receiver,
|
|
llvm::Constant::getNullValue(Receiver->getType()));
|
|
Builder.CreateCondBr(isNil, continueBB, messageBB);
|
|
CGF.EmitBlock(messageBB);
|
|
}
|
|
|
|
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,
|
|
FunctionType::ExtInfo());
|
|
const llvm::FunctionType *impType =
|
|
Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false);
|
|
|
|
llvm::Value *impMD[] = {
|
|
llvm::MDString::get(VMContext, Sel.getAsString()),
|
|
llvm::MDString::get(VMContext, Class ? Class->getNameAsString() :""),
|
|
llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), Class!=0)
|
|
};
|
|
llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD, 3);
|
|
|
|
|
|
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.CurCodeDecl)) {
|
|
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::CallInst *slot =
|
|
Builder.CreateCall3(lookupFunction, ReceiverPtr, cmd, self);
|
|
slot->setOnlyReadsMemory();
|
|
slot->setMetadata(msgSendMDKind, node);
|
|
|
|
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, true)), 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);
|
|
cast<llvm::CallInst>(imp)->setMetadata(msgSendMDKind, node);
|
|
}
|
|
llvm::Instruction *call;
|
|
RValue msgRet = CGF.EmitCall(FnInfo, imp, Return, ActualArgs,
|
|
0, &call);
|
|
call->setMetadata(msgSendMDKind, node);
|
|
|
|
|
|
if (!isPointerSizedReturn) {
|
|
messageBB = CGF.Builder.GetInsertBlock();
|
|
CGF.Builder.CreateBr(continueBB);
|
|
CGF.EmitBlock(continueBB);
|
|
if (msgRet.isScalar()) {
|
|
llvm::Value *v = msgRet.getScalarVal();
|
|
llvm::PHINode *phi = Builder.CreatePHI(v->getType());
|
|
phi->addIncoming(v, messageBB);
|
|
phi->addIncoming(llvm::Constant::getNullValue(v->getType()), startBB);
|
|
msgRet = RValue::get(phi);
|
|
} else if (msgRet.isAggregate()) {
|
|
llvm::Value *v = msgRet.getAggregateAddr();
|
|
llvm::PHINode *phi = Builder.CreatePHI(v->getType());
|
|
const llvm::PointerType *RetTy = cast<llvm::PointerType>(v->getType());
|
|
llvm::AllocaInst *NullVal =
|
|
CGF.CreateTempAlloca(RetTy->getElementType(), "null");
|
|
CGF.InitTempAlloca(NullVal,
|
|
llvm::Constant::getNullValue(RetTy->getElementType()));
|
|
phi->addIncoming(v, messageBB);
|
|
phi->addIncoming(NullVal, startBB);
|
|
msgRet = RValue::getAggregate(phi);
|
|
} else /* isComplex() */ {
|
|
std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal();
|
|
llvm::PHINode *phi = Builder.CreatePHI(v.first->getType());
|
|
phi->addIncoming(v.first, messageBB);
|
|
phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()),
|
|
startBB);
|
|
llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType());
|
|
phi2->addIncoming(v.second, messageBB);
|
|
phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()),
|
|
startBB);
|
|
msgRet = RValue::getComplex(phi, phi2);
|
|
}
|
|
}
|
|
return msgRet;
|
|
}
|
|
|
|
/// 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,
|
|
bool isMeta) {
|
|
// 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, (isMeta ? "_OBJC_METACLASS_":
|
|
"_OBJC_CLASS_") + std::string(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.
|
|
SizeTy,
|
|
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.
|
|
SizeTy,
|
|
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 ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl();
|
|
const ObjCList<ObjCProtocolDecl> &Protos = CatDecl->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();
|
|
ObjCPropertyImplDecl *propertyImpl = *iter;
|
|
bool isSynthesized = (propertyImpl->getPropertyImplementation() ==
|
|
ObjCPropertyImplDecl::Synthesize);
|
|
|
|
Fields.push_back(MakeConstantString(property->getNameAsString()));
|
|
Fields.push_back(llvm::ConstantInt::get(Int8Ty,
|
|
property->getPropertyAttributes()));
|
|
Fields.push_back(llvm::ConstantInt::get(Int8Ty, isSynthesized));
|
|
if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) {
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForMethodDecl(getter,TypeStr);
|
|
llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
|
|
if (isSynthesized) {
|
|
InstanceMethodTypes.push_back(TypeEncoding);
|
|
InstanceMethodSels.push_back(getter->getSelector());
|
|
}
|
|
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);
|
|
if (isSynthesized) {
|
|
InstanceMethodTypes.push_back(TypeEncoding);
|
|
InstanceMethodSels.push_back(setter->getSelector());
|
|
}
|
|
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);
|
|
}
|
|
|
|
// Collect declared and synthesized ivars.
|
|
llvm::SmallVector<ObjCIvarDecl*, 16> OIvars;
|
|
CGM.getContext().ShallowCollectObjCIvars(ClassDecl, OIvars);
|
|
|
|
for (unsigned i = 0, e = OIvars.size(); i != e; ++i) {
|
|
ObjCIvarDecl *IVD = OIvars[i];
|
|
// Store the name
|
|
IvarNames.push_back(MakeConstantString(IVD->getNameAsString()));
|
|
// Get the type encoding for this ivar
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForType(IVD->getType(), TypeStr);
|
|
IvarTypes.push_back(MakeConstantString(TypeStr));
|
|
// Get the offset
|
|
uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD);
|
|
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, Offset),
|
|
"__objc_ivar_offset_value_" + ClassName +"." +
|
|
IVD->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.
|
|
|
|
// 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 (unsigned i = 0, e = OIvars.size(); i != e; ++i) {
|
|
ObjCIvarDecl *IVD = OIvars[i];
|
|
const std::string Name = "__objc_ivar_offset_" + ClassName + '.'
|
|
+ IVD->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 variable, 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, true);
|
|
|
|
// 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->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(ClassStruct, IdTy));
|
|
ClassPtrAlias->eraseFromParent();
|
|
ClassPtrAlias = 0;
|
|
}
|
|
if (MetaClassPtrAlias) {
|
|
MetaClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy));
|
|
MetaClassPtrAlias->eraseFromParent();
|
|
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::LinkOnceODRLinkage,
|
|
llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2),
|
|
MangleSelectorTypes(".objc_sel_ptr"+iter->first.first+"."+
|
|
iter->first.second));
|
|
// 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->replaceAllUsesWith(SelPtr);
|
|
(*iter).second->eraseFromParent();
|
|
}
|
|
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::LinkOnceODRLinkage,
|
|
llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2),
|
|
MangleSelectorTypes(std::string(".objc_sel_ptr")+iter->getKey().str()));
|
|
// 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->replaceAllUsesWith(SelPtr);
|
|
(*iter).second->eraseFromParent();
|
|
}
|
|
// 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 = CD->getName();
|
|
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;
|
|
Params.push_back(IdTy);
|
|
Params.push_back(SelectorTy);
|
|
Params.push_back(IntTy);
|
|
Params.push_back(BoolTy);
|
|
// void objc_getProperty (id, SEL, int, 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;
|
|
Params.push_back(IdTy);
|
|
Params.push_back(SelectorTy);
|
|
Params.push_back(IntTy);
|
|
Params.push_back(IdTy);
|
|
Params.push_back(BoolTy);
|
|
Params.push_back(BoolTy);
|
|
// void objc_setProperty (id, SEL, int, 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::Function *CGObjCGNU::GetGetStructFunction() {
|
|
std::vector<const llvm::Type*> Params;
|
|
Params.push_back(PtrTy);
|
|
Params.push_back(PtrTy);
|
|
Params.push_back(PtrDiffTy);
|
|
Params.push_back(BoolTy);
|
|
Params.push_back(BoolTy);
|
|
// objc_setPropertyStruct (void*, void*, ptrdiff_t, BOOL, BOOL)
|
|
const llvm::FunctionType *FTy =
|
|
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Params, false);
|
|
return cast<llvm::Function>(CGM.CreateRuntimeFunction(FTy,
|
|
"objc_getPropertyStruct"));
|
|
}
|
|
llvm::Function *CGObjCGNU::GetSetStructFunction() {
|
|
std::vector<const llvm::Type*> Params;
|
|
Params.push_back(PtrTy);
|
|
Params.push_back(PtrTy);
|
|
Params.push_back(PtrDiffTy);
|
|
Params.push_back(BoolTy);
|
|
Params.push_back(BoolTy);
|
|
// objc_setPropertyStruct (void*, void*, ptrdiff_t, BOOL, BOOL)
|
|
const llvm::FunctionType *FTy =
|
|
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Params, false);
|
|
return cast<llvm::Function>(CGM.CreateRuntimeFunction(FTy,
|
|
"objc_setPropertyStruct"));
|
|
}
|
|
|
|
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,
|
|
FunctionType::ExtInfo()), false);
|
|
return CGM.CreateRuntimeFunction(FTy, "objc_enumerationMutation");
|
|
}
|
|
|
|
namespace {
|
|
struct CallSyncExit : EHScopeStack::Cleanup {
|
|
llvm::Value *SyncExitFn;
|
|
llvm::Value *SyncArg;
|
|
CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
|
|
: SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
|
|
|
|
void Emit(CodeGenFunction &CGF, bool IsForEHCleanup) {
|
|
CGF.Builder.CreateCall(SyncExitFn, SyncArg)->setDoesNotThrow();
|
|
}
|
|
};
|
|
}
|
|
|
|
void CGObjCGNU::EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCAtSynchronizedStmt &S) {
|
|
std::vector<const llvm::Type*> Args(1, IdTy);
|
|
llvm::FunctionType *FTy =
|
|
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false);
|
|
|
|
// Evaluate the lock operand. This should dominate the cleanup.
|
|
llvm::Value *SyncArg =
|
|
CGF.EmitScalarExpr(S.getSynchExpr());
|
|
|
|
// Acquire the lock.
|
|
llvm::Value *SyncEnter = CGM.CreateRuntimeFunction(FTy, "objc_sync_enter");
|
|
SyncArg = CGF.Builder.CreateBitCast(SyncArg, IdTy);
|
|
CGF.Builder.CreateCall(SyncEnter, SyncArg);
|
|
|
|
// Register an all-paths cleanup to release the lock.
|
|
llvm::Value *SyncExit = CGM.CreateRuntimeFunction(FTy, "objc_sync_exit");
|
|
CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, SyncExit, SyncArg);
|
|
|
|
// Emit the body of the statement.
|
|
CGF.EmitStmt(S.getSynchBody());
|
|
|
|
// Pop the lock-release cleanup.
|
|
CGF.PopCleanupBlock();
|
|
}
|
|
|
|
namespace {
|
|
struct CatchHandler {
|
|
const VarDecl *Variable;
|
|
const Stmt *Body;
|
|
llvm::BasicBlock *Block;
|
|
llvm::Value *TypeInfo;
|
|
};
|
|
}
|
|
|
|
void CGObjCGNU::EmitTryStmt(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCAtTryStmt &S) {
|
|
// Unlike the Apple non-fragile runtimes, which also uses
|
|
// unwind-based zero cost exceptions, the GNU Objective C runtime's
|
|
// EH support isn't a veneer over C++ EH. Instead, exception
|
|
// objects are created by __objc_exception_throw and destroyed by
|
|
// the personality function; this avoids the need for bracketing
|
|
// catch handlers with calls to __blah_begin_catch/__blah_end_catch
|
|
// (or even _Unwind_DeleteException), but probably doesn't
|
|
// interoperate very well with foreign exceptions.
|
|
|
|
// Jump destination for falling out of catch bodies.
|
|
CodeGenFunction::JumpDest Cont;
|
|
if (S.getNumCatchStmts())
|
|
Cont = CGF.getJumpDestInCurrentScope("eh.cont");
|
|
|
|
// We handle @finally statements by pushing them as a cleanup
|
|
// before entering the catch.
|
|
CodeGenFunction::FinallyInfo FinallyInfo;
|
|
if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt()) {
|
|
std::vector<const llvm::Type*> Args(1, IdTy);
|
|
llvm::FunctionType *FTy =
|
|
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Args, false);
|
|
llvm::Constant *Rethrow =
|
|
CGM.CreateRuntimeFunction(FTy, "objc_exception_throw");
|
|
|
|
FinallyInfo = CGF.EnterFinallyBlock(Finally->getFinallyBody(), 0, 0,
|
|
Rethrow);
|
|
}
|
|
|
|
llvm::SmallVector<CatchHandler, 8> Handlers;
|
|
|
|
// Enter the catch, if there is one.
|
|
if (S.getNumCatchStmts()) {
|
|
for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
|
|
const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
|
|
const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
|
|
|
|
Handlers.push_back(CatchHandler());
|
|
CatchHandler &Handler = Handlers.back();
|
|
Handler.Variable = CatchDecl;
|
|
Handler.Body = CatchStmt->getCatchBody();
|
|
Handler.Block = CGF.createBasicBlock("catch");
|
|
|
|
// @catch() and @catch(id) both catch any ObjC exception.
|
|
// Treat them as catch-alls.
|
|
// FIXME: this is what this code was doing before, but should 'id'
|
|
// really be catching foreign exceptions?
|
|
if (!CatchDecl
|
|
|| CatchDecl->getType()->isObjCIdType()
|
|
|| CatchDecl->getType()->isObjCQualifiedIdType()) {
|
|
|
|
Handler.TypeInfo = 0; // catch-all
|
|
|
|
// Don't consider any other catches.
|
|
break;
|
|
}
|
|
|
|
// All other types should be Objective-C interface pointer types.
|
|
const ObjCObjectPointerType *OPT =
|
|
CatchDecl->getType()->getAs<ObjCObjectPointerType>();
|
|
assert(OPT && "Invalid @catch type.");
|
|
const ObjCInterfaceDecl *IDecl =
|
|
OPT->getObjectType()->getInterface();
|
|
assert(IDecl && "Invalid @catch type.");
|
|
Handler.TypeInfo = MakeConstantString(IDecl->getNameAsString());
|
|
}
|
|
|
|
EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
|
|
for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
|
|
Catch->setHandler(I, Handlers[I].TypeInfo, Handlers[I].Block);
|
|
}
|
|
|
|
// Emit the try body.
|
|
CGF.EmitStmt(S.getTryBody());
|
|
|
|
// Leave the try.
|
|
if (S.getNumCatchStmts())
|
|
CGF.EHStack.popCatch();
|
|
|
|
// Remember where we were.
|
|
CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
|
|
|
|
// Emit the handlers.
|
|
for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
|
|
CatchHandler &Handler = Handlers[I];
|
|
CGF.EmitBlock(Handler.Block);
|
|
|
|
llvm::Value *Exn = CGF.Builder.CreateLoad(CGF.getExceptionSlot());
|
|
|
|
// Bind the catch parameter if it exists.
|
|
if (const VarDecl *CatchParam = Handler.Variable) {
|
|
const llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
|
|
Exn = CGF.Builder.CreateBitCast(Exn, CatchType);
|
|
|
|
CGF.EmitAutoVarDecl(*CatchParam);
|
|
CGF.Builder.CreateStore(Exn, CGF.GetAddrOfLocalVar(CatchParam));
|
|
}
|
|
|
|
CGF.ObjCEHValueStack.push_back(Exn);
|
|
CGF.EmitStmt(Handler.Body);
|
|
CGF.ObjCEHValueStack.pop_back();
|
|
|
|
CGF.EmitBranchThroughCleanup(Cont);
|
|
}
|
|
|
|
// Go back to the try-statement fallthrough.
|
|
CGF.Builder.restoreIP(SavedIP);
|
|
|
|
// Pop out of the finally.
|
|
if (S.getFinallyStmt())
|
|
CGF.ExitFinallyBlock(FinallyInfo);
|
|
|
|
if (Cont.isValid()) {
|
|
if (Cont.getBlock()->use_empty())
|
|
delete Cont.getBlock();
|
|
else
|
|
CGF.EmitBlock(Cont.getBlock());
|
|
}
|
|
}
|
|
|
|
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,
|
|
bool threadlocal) {
|
|
CGBuilderTy B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
if (!threadlocal)
|
|
B.CreateCall2(GlobalAssignFn, src, dst);
|
|
else
|
|
// FIXME. Add threadloca assign API
|
|
assert(false && "EmitObjCGlobalAssign - Threal Local API NYI");
|
|
}
|
|
|
|
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,
|
|
llvm::Value *Size) {
|
|
CGBuilderTy B = CGF.Builder;
|
|
DestPtr = EnforceType(B, DestPtr, IdTy);
|
|
SrcPtr = EnforceType(B, SrcPtr, PtrToIdTy);
|
|
|
|
B.CreateCall3(MemMoveFn, DestPtr, SrcPtr, Size);
|
|
}
|
|
|
|
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) {
|
|
// This will cause a run-time crash if we accidentally use it. A value of
|
|
// 0 would seem more sensible, but will silently overwrite the isa pointer
|
|
// causing a great deal of confusion.
|
|
uint64_t Offset = -1;
|
|
// We can't call ComputeIvarBaseOffset() here if we have the
|
|
// implementation, because it will create an invalid ASTRecordLayout object
|
|
// that we are then stuck with forever, so we only initialize the ivar
|
|
// offset variable with a guess if we only have the interface. The
|
|
// initializer will be reset later anyway, when we are generating the class
|
|
// description.
|
|
if (!CGM.getContext().getObjCImplementation(
|
|
const_cast<ObjCInterfaceDecl *>(ID)))
|
|
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<ObjCObjectType>()->getInterface();
|
|
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);
|
|
}
|