| //===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This provides Objective-C code generation targeting the GNU runtime. The |
| // class in this file generates structures used by the GNU Objective-C runtime |
| // library. These structures are defined in objc/objc.h and objc/objc-api.h in |
| // the GNU runtime distribution. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CGObjCRuntime.h" |
| #include "CodeGenModule.h" |
| #include "CodeGenFunction.h" |
| #include "CGCleanup.h" |
| |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/AST/RecordLayout.h" |
| #include "clang/AST/StmtObjC.h" |
| #include "clang/Basic/SourceManager.h" |
| #include "clang/Basic/FileManager.h" |
| |
| #include "llvm/Intrinsics.h" |
| #include "llvm/Module.h" |
| #include "llvm/LLVMContext.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/Support/CallSite.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Target/TargetData.h" |
| |
| #include <stdarg.h> |
| |
| |
| using namespace clang; |
| using namespace CodeGen; |
| using llvm::dyn_cast; |
| |
| |
| namespace { |
| /// Class that lazily initialises the runtime function. Avoids inserting the |
| /// types and the function declaration into a module if they're not used, and |
| /// avoids constructing the type more than once if it's used more than once. |
| class LazyRuntimeFunction { |
| CodeGenModule *CGM; |
| std::vector<llvm::Type*> ArgTys; |
| const char *FunctionName; |
| llvm::Constant *Function; |
| public: |
| /// Constructor leaves this class uninitialized, because it is intended to |
| /// be used as a field in another class and not all of the types that are |
| /// used as arguments will necessarily be available at construction time. |
| LazyRuntimeFunction() : CGM(0), FunctionName(0), Function(0) {} |
| |
| /// Initialises the lazy function with the name, return type, and the types |
| /// of the arguments. |
| END_WITH_NULL |
| void init(CodeGenModule *Mod, const char *name, |
| llvm::Type *RetTy, ...) { |
| CGM =Mod; |
| FunctionName = name; |
| Function = 0; |
| ArgTys.clear(); |
| va_list Args; |
| va_start(Args, RetTy); |
| while (llvm::Type *ArgTy = va_arg(Args, llvm::Type*)) |
| ArgTys.push_back(ArgTy); |
| va_end(Args); |
| // Push the return type on at the end so we can pop it off easily |
| ArgTys.push_back(RetTy); |
| } |
| /// Overloaded cast operator, allows the class to be implicitly cast to an |
| /// LLVM constant. |
| operator llvm::Constant*() { |
| if (!Function) { |
| if (0 == FunctionName) return 0; |
| // We put the return type on the end of the vector, so pop it back off |
| const llvm::Type *RetTy = ArgTys.back(); |
| ArgTys.pop_back(); |
| llvm::FunctionType *FTy = llvm::FunctionType::get(RetTy, ArgTys, false); |
| Function = |
| cast<llvm::Constant>(CGM->CreateRuntimeFunction(FTy, FunctionName)); |
| // We won't need to use the types again, so we may as well clean up the |
| // vector now |
| ArgTys.resize(0); |
| } |
| return Function; |
| } |
| operator llvm::Function*() { |
| return cast<llvm::Function>((llvm::Constant*)*this); |
| } |
| |
| }; |
| |
| |
| /// GNU Objective-C runtime code generation. This class implements the parts of |
| /// Objective-C support that are specific to the GNU family of runtimes (GCC and |
| /// GNUstep). |
| class CGObjCGNU : public CGObjCRuntime { |
| protected: |
| /// The module that is using this class |
| CodeGenModule &CGM; |
| /// The LLVM module into which output is inserted |
| llvm::Module &TheModule; |
| /// strut objc_super. Used for sending messages to super. This structure |
| /// contains the receiver (object) and the expected class. |
| const llvm::StructType *ObjCSuperTy; |
| /// struct objc_super*. The type of the argument to the superclass message |
| /// lookup functions. |
| const llvm::PointerType *PtrToObjCSuperTy; |
| /// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring |
| /// SEL is included in a header somewhere, in which case it will be whatever |
| /// type is declared in that header, most likely {i8*, i8*}. |
| llvm::PointerType *SelectorTy; |
| /// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the |
| /// places where it's used |
| const llvm::IntegerType *Int8Ty; |
| /// Pointer to i8 - LLVM type of char*, for all of the places where the |
| /// runtime needs to deal with C strings. |
| llvm::PointerType *PtrToInt8Ty; |
| /// Instance Method Pointer type. This is a pointer to a function that takes, |
| /// at a minimum, an object and a selector, and is the generic type for |
| /// Objective-C methods. Due to differences between variadic / non-variadic |
| /// calling conventions, it must always be cast to the correct type before |
| /// actually being used. |
| llvm::PointerType *IMPTy; |
| /// Type of an untyped Objective-C object. Clang treats id as a built-in type |
| /// when compiling Objective-C code, so this may be an opaque pointer (i8*), |
| /// but if the runtime header declaring it is included then it may be a |
| /// pointer to a structure. |
| llvm::PointerType *IdTy; |
| /// Pointer to a pointer to an Objective-C object. Used in the new ABI |
| /// message lookup function and some GC-related functions. |
| const llvm::PointerType *PtrToIdTy; |
| /// The clang type of id. Used when using the clang CGCall infrastructure to |
| /// call Objective-C methods. |
| CanQualType ASTIdTy; |
| /// LLVM type for C int type. |
| llvm::IntegerType *IntTy; |
| /// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is |
| /// used in the code to document the difference between i8* meaning a pointer |
| /// to a C string and i8* meaning a pointer to some opaque type. |
| llvm::PointerType *PtrTy; |
| /// LLVM type for C long type. The runtime uses this in a lot of places where |
| /// it should be using intptr_t, but we can't fix this without breaking |
| /// compatibility with GCC... |
| const llvm::IntegerType *LongTy; |
| /// LLVM type for C size_t. Used in various runtime data structures. |
| const llvm::IntegerType *SizeTy; |
| /// LLVM type for C ptrdiff_t. Mainly used in property accessor functions. |
| const llvm::IntegerType *PtrDiffTy; |
| /// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance |
| /// variables. |
| const llvm::PointerType *PtrToIntTy; |
| /// LLVM type for Objective-C BOOL type. |
| const llvm::Type *BoolTy; |
| /// Metadata kind used to tie method lookups to message sends. The GNUstep |
| /// runtime provides some LLVM passes that can use this to do things like |
| /// automatic IMP caching and speculative inlining. |
| unsigned msgSendMDKind; |
| /// Helper function that generates a constant string and returns a pointer to |
| /// the start of the string. The result of this function can be used anywhere |
| /// where the C code specifies const char*. |
| llvm::Constant *MakeConstantString(const std::string &Str, |
| const std::string &Name="") { |
| llvm::Constant *ConstStr = CGM.GetAddrOfConstantCString(Str, Name.c_str()); |
| return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2); |
| } |
| /// Emits a linkonce_odr string, whose name is the prefix followed by the |
| /// string value. This allows the linker to combine the strings between |
| /// different modules. Used for EH typeinfo names, selector strings, and a |
| /// few other things. |
| llvm::Constant *ExportUniqueString(const std::string &Str, |
| const std::string prefix) { |
| std::string name = prefix + Str; |
| llvm::Constant *ConstStr = TheModule.getGlobalVariable(name); |
| if (!ConstStr) { |
| llvm::Constant *value = llvm::ConstantArray::get(VMContext, Str, true); |
| ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true, |
| llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str); |
| } |
| return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2); |
| } |
| /// Generates a global structure, initialized by the elements in the vector. |
| /// The element types must match the types of the structure elements in the |
| /// first argument. |
| llvm::GlobalVariable *MakeGlobal(const llvm::StructType *Ty, |
| std::vector<llvm::Constant*> &V, |
| llvm::StringRef Name="", |
| llvm::GlobalValue::LinkageTypes linkage |
| =llvm::GlobalValue::InternalLinkage) { |
| llvm::Constant *C = llvm::ConstantStruct::get(Ty, V); |
| return new llvm::GlobalVariable(TheModule, Ty, false, |
| linkage, C, Name); |
| } |
| /// Generates a global array. The vector must contain the same number of |
| /// elements that the array type declares, of the type specified as the array |
| /// element type. |
| llvm::GlobalVariable *MakeGlobal(const llvm::ArrayType *Ty, |
| std::vector<llvm::Constant*> &V, |
| llvm::StringRef Name="", |
| llvm::GlobalValue::LinkageTypes linkage |
| =llvm::GlobalValue::InternalLinkage) { |
| llvm::Constant *C = llvm::ConstantArray::get(Ty, V); |
| return new llvm::GlobalVariable(TheModule, Ty, false, |
| linkage, C, Name); |
| } |
| /// Generates a global array, inferring the array type from the specified |
| /// element type and the size of the initialiser. |
| llvm::GlobalVariable *MakeGlobalArray(const llvm::Type *Ty, |
| std::vector<llvm::Constant*> &V, |
| llvm::StringRef Name="", |
| llvm::GlobalValue::LinkageTypes linkage |
| =llvm::GlobalValue::InternalLinkage) { |
| llvm::ArrayType *ArrayTy = llvm::ArrayType::get(Ty, V.size()); |
| return MakeGlobal(ArrayTy, V, Name, linkage); |
| } |
| /// Ensures that the value has the required type, by inserting a bitcast if |
| /// required. This function lets us avoid inserting bitcasts that are |
| /// redundant. |
| llvm::Value* EnforceType(CGBuilderTy B, llvm::Value *V, const llvm::Type *Ty){ |
| if (V->getType() == Ty) return V; |
| return B.CreateBitCast(V, Ty); |
| } |
| // Some zeros used for GEPs in lots of places. |
| llvm::Constant *Zeros[2]; |
| /// Null pointer value. Mainly used as a terminator in various arrays. |
| llvm::Constant *NULLPtr; |
| /// LLVM context. |
| llvm::LLVMContext &VMContext; |
| private: |
| /// Placeholder for the class. Lots of things refer to the class before we've |
| /// actually emitted it. We use this alias as a placeholder, and then replace |
| /// it with a pointer to the class structure before finally emitting the |
| /// module. |
| llvm::GlobalAlias *ClassPtrAlias; |
| /// Placeholder for the metaclass. Lots of things refer to the class before |
| /// we've / actually emitted it. We use this alias as a placeholder, and then |
| /// replace / it with a pointer to the metaclass structure before finally |
| /// emitting the / module. |
| llvm::GlobalAlias *MetaClassPtrAlias; |
| /// All of the classes that have been generated for this compilation units. |
| std::vector<llvm::Constant*> Classes; |
| /// All of the categories that have been generated for this compilation units. |
| std::vector<llvm::Constant*> Categories; |
| /// All of the Objective-C constant strings that have been generated for this |
| /// compilation units. |
| std::vector<llvm::Constant*> ConstantStrings; |
| /// Map from string values to Objective-C constant strings in the output. |
| /// Used to prevent emitting Objective-C strings more than once. This should |
| /// not be required at all - CodeGenModule should manage this list. |
| llvm::StringMap<llvm::Constant*> ObjCStrings; |
| /// All of the protocols that have been declared. |
| llvm::StringMap<llvm::Constant*> ExistingProtocols; |
| /// For each variant of a selector, we store the type encoding and a |
| /// placeholder value. For an untyped selector, the type will be the empty |
| /// string. Selector references are all done via the module's selector table, |
| /// so we create an alias as a placeholder and then replace it with the real |
| /// value later. |
| typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector; |
| /// Type of the selector map. This is roughly equivalent to the structure |
| /// used in the GNUstep runtime, which maintains a list of all of the valid |
| /// types for a selector in a table. |
| typedef llvm::DenseMap<Selector, llvm::SmallVector<TypedSelector, 2> > |
| SelectorMap; |
| /// A map from selectors to selector types. This allows us to emit all |
| /// selectors of the same name and type together. |
| SelectorMap SelectorTable; |
| |
| /// Selectors related to memory management. When compiling in GC mode, we |
| /// omit these. |
| Selector RetainSel, ReleaseSel, AutoreleaseSel; |
| /// Runtime functions used for memory management in GC mode. Note that clang |
| /// supports code generation for calling these functions, but neither GNU |
| /// runtime actually supports this API properly yet. |
| LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn, |
| WeakAssignFn, GlobalAssignFn; |
| |
| protected: |
| /// Function used for throwing Objective-C exceptions. |
| LazyRuntimeFunction ExceptionThrowFn; |
| /// Function used for rethrowing exceptions, used at the end of @finally or |
| /// @synchronize blocks. |
| LazyRuntimeFunction ExceptionReThrowFn; |
| /// Function called when entering a catch function. This is required for |
| /// differentiating Objective-C exceptions and foreign exceptions. |
| LazyRuntimeFunction EnterCatchFn; |
| /// Function called when exiting from a catch block. Used to do exception |
| /// cleanup. |
| LazyRuntimeFunction ExitCatchFn; |
| /// Function called when entering an @synchronize block. Acquires the lock. |
| LazyRuntimeFunction SyncEnterFn; |
| /// Function called when exiting an @synchronize block. Releases the lock. |
| LazyRuntimeFunction SyncExitFn; |
| |
| private: |
| |
| /// Function called if fast enumeration detects that the collection is |
| /// modified during the update. |
| LazyRuntimeFunction EnumerationMutationFn; |
| /// Function for implementing synthesized property getters that return an |
| /// object. |
| LazyRuntimeFunction GetPropertyFn; |
| /// Function for implementing synthesized property setters that return an |
| /// object. |
| LazyRuntimeFunction SetPropertyFn; |
| /// Function used for non-object declared property getters. |
| LazyRuntimeFunction GetStructPropertyFn; |
| /// Function used for non-object declared property setters. |
| LazyRuntimeFunction SetStructPropertyFn; |
| |
| /// The version of the runtime that this class targets. Must match the |
| /// version in the runtime. |
| int RuntimeVersion; |
| /// The version of the protocol class. Used to differentiate between ObjC1 |
| /// and ObjC2 protocols. Objective-C 1 protocols can not contain optional |
| /// components and can not contain declared properties. We always emit |
| /// Objective-C 2 property structures, but we have to pretend that they're |
| /// Objective-C 1 property structures when targeting the GCC runtime or it |
| /// will abort. |
| const int ProtocolVersion; |
| private: |
| /// Generates an instance variable list structure. This is a structure |
| /// containing a size and an array of structures containing instance variable |
| /// metadata. This is used purely for introspection in the fragile ABI. In |
| /// the non-fragile ABI, it's used for instance variable fixup. |
| llvm::Constant *GenerateIvarList( |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes, |
| const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets); |
| /// Generates a method list structure. This is a structure containing a size |
| /// and an array of structures containing method metadata. |
| /// |
| /// This structure is used by both classes and categories, and contains a next |
| /// pointer allowing them to be chained together in a linked list. |
| llvm::Constant *GenerateMethodList(const llvm::StringRef &ClassName, |
| const llvm::StringRef &CategoryName, |
| const llvm::SmallVectorImpl<Selector> &MethodSels, |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes, |
| bool isClassMethodList); |
| /// Emits an empty protocol. This is used for @protocol() where no protocol |
| /// is found. The runtime will (hopefully) fix up the pointer to refer to the |
| /// real protocol. |
| llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName); |
| /// Generates a list of property metadata structures. This follows the same |
| /// pattern as method and instance variable metadata lists. |
| llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID, |
| llvm::SmallVectorImpl<Selector> &InstanceMethodSels, |
| llvm::SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes); |
| /// Generates a list of referenced protocols. Classes, categories, and |
| /// protocols all use this structure. |
| llvm::Constant *GenerateProtocolList( |
| const llvm::SmallVectorImpl<std::string> &Protocols); |
| /// To ensure that all protocols are seen by the runtime, we add a category on |
| /// a class defined in the runtime, declaring no methods, but adopting the |
| /// protocols. This is a horribly ugly hack, but it allows us to collect all |
| /// of the protocols without changing the ABI. |
| void GenerateProtocolHolderCategory(void); |
| /// Generates a class structure. |
| llvm::Constant *GenerateClassStructure( |
| llvm::Constant *MetaClass, |
| llvm::Constant *SuperClass, |
| unsigned info, |
| const char *Name, |
| llvm::Constant *Version, |
| llvm::Constant *InstanceSize, |
| llvm::Constant *IVars, |
| llvm::Constant *Methods, |
| llvm::Constant *Protocols, |
| llvm::Constant *IvarOffsets, |
| llvm::Constant *Properties, |
| bool isMeta=false); |
| /// Generates a method list. This is used by protocols to define the required |
| /// and optional methods. |
| llvm::Constant *GenerateProtocolMethodList( |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames, |
| const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes); |
| /// Returns a selector with the specified type encoding. An empty string is |
| /// used to return an untyped selector (with the types field set to NULL). |
| llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel, |
| const std::string &TypeEncoding, bool lval); |
| /// Returns the variable used to store the offset of an instance variable. |
| llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID, |
| const ObjCIvarDecl *Ivar); |
| /// Emits a reference to a class. This allows the linker to object if there |
| /// is no class of the matching name. |
| void EmitClassRef(const std::string &className); |
| /// Emits a pointer to the named class |
| llvm::Value *GetClassNamed(CGBuilderTy &Builder, const std::string &Name, |
| bool isWeak); |
| protected: |
| /// Looks up the method for sending a message to the specified object. This |
| /// mechanism differs between the GCC and GNU runtimes, so this method must be |
| /// overridden in subclasses. |
| virtual llvm::Value *LookupIMP(CodeGenFunction &CGF, |
| llvm::Value *&Receiver, |
| llvm::Value *cmd, |
| llvm::MDNode *node) = 0; |
| /// Looks up the method for sending a message to a superclass. This mechanism |
| /// differs between the GCC and GNU runtimes, so this method must be |
| /// overridden in subclasses. |
| virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, |
| llvm::Value *ObjCSuper, |
| llvm::Value *cmd) = 0; |
| public: |
| CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion, |
| unsigned protocolClassVersion); |
| |
| virtual llvm::Constant *GenerateConstantString(const StringLiteral *); |
| |
| virtual RValue |
| GenerateMessageSend(CodeGenFunction &CGF, |
| ReturnValueSlot Return, |
| QualType ResultType, |
| Selector Sel, |
| llvm::Value *Receiver, |
| const CallArgList &CallArgs, |
| const ObjCInterfaceDecl *Class, |
| const ObjCMethodDecl *Method); |
| virtual RValue |
| GenerateMessageSendSuper(CodeGenFunction &CGF, |
| ReturnValueSlot Return, |
| QualType ResultType, |
| Selector Sel, |
| const ObjCInterfaceDecl *Class, |
| bool isCategoryImpl, |
| llvm::Value *Receiver, |
| bool IsClassMessage, |
| const CallArgList &CallArgs, |
| const ObjCMethodDecl *Method); |
| virtual llvm::Value *GetClass(CGBuilderTy &Builder, |
| const ObjCInterfaceDecl *OID); |
| virtual llvm::Value *GetSelector(CGBuilderTy &Builder, Selector Sel, |
| bool lval = false); |
| virtual llvm::Value *GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl |
| *Method); |
| virtual llvm::Constant *GetEHType(QualType T); |
| |
| virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, |
| const ObjCContainerDecl *CD); |
| virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD); |
| virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl); |
| virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder, |
| const ObjCProtocolDecl *PD); |
| virtual void GenerateProtocol(const ObjCProtocolDecl *PD); |
| virtual llvm::Function *ModuleInitFunction(); |
| virtual llvm::Constant *GetPropertyGetFunction(); |
| virtual llvm::Constant *GetPropertySetFunction(); |
| virtual llvm::Constant *GetSetStructFunction(); |
| virtual llvm::Constant *GetGetStructFunction(); |
| virtual llvm::Constant *EnumerationMutationFunction(); |
| |
| virtual void EmitTryStmt(CodeGenFunction &CGF, |
| const ObjCAtTryStmt &S); |
| virtual void EmitSynchronizedStmt(CodeGenFunction &CGF, |
| const ObjCAtSynchronizedStmt &S); |
| virtual void EmitThrowStmt(CodeGenFunction &CGF, |
| const ObjCAtThrowStmt &S); |
| virtual llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF, |
| llvm::Value *AddrWeakObj); |
| virtual void EmitObjCWeakAssign(CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst); |
| virtual void EmitObjCGlobalAssign(CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest, |
| bool threadlocal=false); |
| virtual void EmitObjCIvarAssign(CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest, |
| llvm::Value *ivarOffset); |
| virtual void EmitObjCStrongCastAssign(CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dest); |
| virtual void EmitGCMemmoveCollectable(CodeGenFunction &CGF, |
| llvm::Value *DestPtr, |
| llvm::Value *SrcPtr, |
| llvm::Value *Size); |
| virtual LValue EmitObjCValueForIvar(CodeGenFunction &CGF, |
| QualType ObjectTy, |
| llvm::Value *BaseValue, |
| const ObjCIvarDecl *Ivar, |
| unsigned CVRQualifiers); |
| virtual llvm::Value *EmitIvarOffset(CodeGenFunction &CGF, |
| const ObjCInterfaceDecl *Interface, |
| const ObjCIvarDecl *Ivar); |
| virtual llvm::Value *EmitNSAutoreleasePoolClassRef(CGBuilderTy &Builder); |
| virtual llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM, |
| const CGBlockInfo &blockInfo) { |
| return NULLPtr; |
| } |
| |
| virtual llvm::GlobalVariable *GetClassGlobal(const std::string &Name) { |
| return 0; |
| } |
| }; |
| /// Class representing the legacy GCC Objective-C ABI. This is the default when |
| /// -fobjc-nonfragile-abi is not specified. |
| /// |
| /// The GCC ABI target actually generates code that is approximately compatible |
| /// with the new GNUstep runtime ABI, but refrains from using any features that |
| /// would not work with the GCC runtime. For example, clang always generates |
| /// the extended form of the class structure, and the extra fields are simply |
| /// ignored by GCC libobjc. |
| class CGObjCGCC : public CGObjCGNU { |
| /// The GCC ABI message lookup function. Returns an IMP pointing to the |
| /// method implementation for this message. |
| LazyRuntimeFunction MsgLookupFn; |
| /// The GCC ABI superclass message lookup function. Takes a pointer to a |
| /// structure describing the receiver and the class, and a selector as |
| /// arguments. Returns the IMP for the corresponding method. |
| LazyRuntimeFunction MsgLookupSuperFn; |
| protected: |
| virtual llvm::Value *LookupIMP(CodeGenFunction &CGF, |
| llvm::Value *&Receiver, |
| llvm::Value *cmd, |
| llvm::MDNode *node) { |
| CGBuilderTy &Builder = CGF.Builder; |
| llvm::Value *imp = Builder.CreateCall2(MsgLookupFn, |
| EnforceType(Builder, Receiver, IdTy), |
| EnforceType(Builder, cmd, SelectorTy)); |
| cast<llvm::CallInst>(imp)->setMetadata(msgSendMDKind, node); |
| return imp; |
| } |
| virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, |
| llvm::Value *ObjCSuper, |
| llvm::Value *cmd) { |
| CGBuilderTy &Builder = CGF.Builder; |
| llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper, |
| PtrToObjCSuperTy), cmd}; |
| return Builder.CreateCall(MsgLookupSuperFn, lookupArgs, lookupArgs+2); |
| } |
| public: |
| CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) { |
| // IMP objc_msg_lookup(id, SEL); |
| MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy, NULL); |
| // IMP objc_msg_lookup_super(struct objc_super*, SEL); |
| MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy, |
| PtrToObjCSuperTy, SelectorTy, NULL); |
| } |
| }; |
| /// Class used when targeting the new GNUstep runtime ABI. |
| class CGObjCGNUstep : public CGObjCGNU { |
| /// The slot lookup function. Returns a pointer to a cacheable structure |
| /// that contains (among other things) the IMP. |
| LazyRuntimeFunction SlotLookupFn; |
| /// The GNUstep ABI superclass message lookup function. Takes a pointer to |
| /// a structure describing the receiver and the class, and a selector as |
| /// arguments. Returns the slot for the corresponding method. Superclass |
| /// message lookup rarely changes, so this is a good caching opportunity. |
| LazyRuntimeFunction SlotLookupSuperFn; |
| /// Type of an slot structure pointer. This is returned by the various |
| /// lookup functions. |
| llvm::Type *SlotTy; |
| protected: |
| virtual llvm::Value *LookupIMP(CodeGenFunction &CGF, |
| llvm::Value *&Receiver, |
| llvm::Value *cmd, |
| llvm::MDNode *node) { |
| CGBuilderTy &Builder = CGF.Builder; |
| llvm::Function *LookupFn = SlotLookupFn; |
| |
| // Store the receiver on the stack so that we can reload it later |
| llvm::Value *ReceiverPtr = CGF.CreateTempAlloca(Receiver->getType()); |
| Builder.CreateStore(Receiver, ReceiverPtr); |
| |
| llvm::Value *self; |
| |
| if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) { |
| self = CGF.LoadObjCSelf(); |
| } else { |
| self = llvm::ConstantPointerNull::get(IdTy); |
| } |
| |
| // The lookup function is guaranteed not to capture the receiver pointer. |
| LookupFn->setDoesNotCapture(1); |
| |
| llvm::CallInst *slot = |
| Builder.CreateCall3(LookupFn, |
| EnforceType(Builder, ReceiverPtr, PtrToIdTy), |
| EnforceType(Builder, cmd, SelectorTy), |
| EnforceType(Builder, self, IdTy)); |
| slot->setOnlyReadsMemory(); |
| slot->setMetadata(msgSendMDKind, node); |
| |
| // Load the imp from the slot |
| llvm::Value *imp = Builder.CreateLoad(Builder.CreateStructGEP(slot, 4)); |
| |
| // The lookup function may have changed the receiver, so make sure we use |
| // the new one. |
| Receiver = Builder.CreateLoad(ReceiverPtr, true); |
| return imp; |
| } |
| virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, |
| llvm::Value *ObjCSuper, |
| llvm::Value *cmd) { |
| CGBuilderTy &Builder = CGF.Builder; |
| llvm::Value *lookupArgs[] = {ObjCSuper, cmd}; |
| |
| llvm::CallInst *slot = Builder.CreateCall(SlotLookupSuperFn, lookupArgs, |
| lookupArgs+2); |
| slot->setOnlyReadsMemory(); |
| |
| return Builder.CreateLoad(Builder.CreateStructGEP(slot, 4)); |
| } |
| public: |
| CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNU(Mod, 9, 3) { |
| llvm::StructType *SlotStructTy = llvm::StructType::get(PtrTy, |
| PtrTy, PtrTy, IntTy, IMPTy, NULL); |
| SlotTy = llvm::PointerType::getUnqual(SlotStructTy); |
| // Slot_t objc_msg_lookup_sender(id *receiver, SEL selector, id sender); |
| SlotLookupFn.init(&CGM, "objc_msg_lookup_sender", SlotTy, PtrToIdTy, |
| SelectorTy, IdTy, NULL); |
| // Slot_t objc_msg_lookup_super(struct objc_super*, SEL); |
| SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy, |
| PtrToObjCSuperTy, SelectorTy, NULL); |
| // If we're in ObjC++ mode, then we want to make |
| if (CGM.getLangOptions().CPlusPlus) { |
| llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); |
| // void *__cxa_begin_catch(void *e) |
| EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy, NULL); |
| // void __cxa_end_catch(void) |
| EnterCatchFn.init(&CGM, "__cxa_end_catch", VoidTy, NULL); |
| // void _Unwind_Resume_or_Rethrow(void*) |
| ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy, PtrTy, NULL); |
| } |
| } |
| }; |
| |
| } // end anonymous namespace |
| |
| |
| /// Emits a reference to a dummy variable which is emitted with each class. |
| /// This ensures that a linker error will be generated when trying to link |
| /// together modules where a referenced class is not defined. |
| void CGObjCGNU::EmitClassRef(const std::string &className) { |
| std::string symbolRef = "__objc_class_ref_" + className; |
| // Don't emit two copies of the same symbol |
| if (TheModule.getGlobalVariable(symbolRef)) |
| return; |
| std::string symbolName = "__objc_class_name_" + className; |
| llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName); |
| if (!ClassSymbol) { |
| ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false, |
| llvm::GlobalValue::ExternalLinkage, 0, symbolName); |
| } |
| new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true, |
| llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef); |
| } |
| |
| static std::string SymbolNameForMethod(const llvm::StringRef &ClassName, |
| const llvm::StringRef &CategoryName, const Selector MethodName, |
| bool isClassMethod) { |
| std::string MethodNameColonStripped = MethodName.getAsString(); |
| std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(), |
| ':', '_'); |
| return (llvm::Twine(isClassMethod ? "_c_" : "_i_") + ClassName + "_" + |
| CategoryName + "_" + MethodNameColonStripped).str(); |
| } |
| |
| CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion, |
| unsigned protocolClassVersion) |
| : CGM(cgm), TheModule(CGM.getModule()), VMContext(cgm.getLLVMContext()), |
| ClassPtrAlias(0), MetaClassPtrAlias(0), RuntimeVersion(runtimeABIVersion), |
| ProtocolVersion(protocolClassVersion) { |
| |
| msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend"); |
| |
| CodeGenTypes &Types = CGM.getTypes(); |
| IntTy = cast<llvm::IntegerType>( |
| Types.ConvertType(CGM.getContext().IntTy)); |
| LongTy = cast<llvm::IntegerType>( |
| Types.ConvertType(CGM.getContext().LongTy)); |
| SizeTy = cast<llvm::IntegerType>( |
| Types.ConvertType(CGM.getContext().getSizeType())); |
| PtrDiffTy = cast<llvm::IntegerType>( |
| Types.ConvertType(CGM.getContext().getPointerDiffType())); |
| BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy); |
| |
| Int8Ty = llvm::Type::getInt8Ty(VMContext); |
| // C string type. Used in lots of places. |
| PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty); |
| |
| Zeros[0] = llvm::ConstantInt::get(LongTy, 0); |
| Zeros[1] = Zeros[0]; |
| NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty); |
| // Get the selector Type. |
| QualType selTy = CGM.getContext().getObjCSelType(); |
| if (QualType() == selTy) { |
| SelectorTy = PtrToInt8Ty; |
| } else { |
| SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy)); |
| } |
| |
| PtrToIntTy = llvm::PointerType::getUnqual(IntTy); |
| PtrTy = PtrToInt8Ty; |
| |
| // Object type |
| QualType UnqualIdTy = CGM.getContext().getObjCIdType(); |
| ASTIdTy = CanQualType(); |
| if (UnqualIdTy != QualType()) { |
| ASTIdTy = CGM.getContext().getCanonicalType(UnqualIdTy); |
| IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); |
| } else { |
| IdTy = PtrToInt8Ty; |
| } |
| PtrToIdTy = llvm::PointerType::getUnqual(IdTy); |
| |
| ObjCSuperTy = llvm::StructType::get(IdTy, IdTy, NULL); |
| PtrToObjCSuperTy = llvm::PointerType::getUnqual(ObjCSuperTy); |
| |
| llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); |
| |
| // void objc_exception_throw(id); |
| ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, NULL); |
| ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, NULL); |
| // int objc_sync_enter(id); |
| SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy, NULL); |
| // int objc_sync_exit(id); |
| SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy, NULL); |
| |
| // void objc_enumerationMutation (id) |
| EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy, |
| IdTy, NULL); |
| |
| // id objc_getProperty(id, SEL, ptrdiff_t, BOOL) |
| GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy, |
| PtrDiffTy, BoolTy, NULL); |
| // void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL) |
| SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy, |
| PtrDiffTy, IdTy, BoolTy, BoolTy, NULL); |
| // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL) |
| GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy, |
| PtrDiffTy, BoolTy, BoolTy, NULL); |
| // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL) |
| SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy, |
| PtrDiffTy, BoolTy, BoolTy, NULL); |
| |
| // IMP type |
| llvm::Type *IMPArgs[] = { IdTy, SelectorTy }; |
| IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs, |
| true)); |
| |
| const LangOptions &Opts = CGM.getLangOptions(); |
| if ((Opts.getGCMode() != LangOptions::NonGC) || Opts.ObjCAutoRefCount) |
| RuntimeVersion = 10; |
| |
| // Don't bother initialising the GC stuff unless we're compiling in GC mode |
| if (Opts.getGCMode() != LangOptions::NonGC) { |
| // This is a bit of an hack. We should sort this out by having a proper |
| // CGObjCGNUstep subclass for GC, but we may want to really support the old |
| // ABI and GC added in ObjectiveC2.framework, so we fudge it a bit for now |
| // Get selectors needed in GC mode |
| RetainSel = GetNullarySelector("retain", CGM.getContext()); |
| ReleaseSel = GetNullarySelector("release", CGM.getContext()); |
| AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext()); |
| |
| // Get functions needed in GC mode |
| |
| // id objc_assign_ivar(id, id, ptrdiff_t); |
| IvarAssignFn.init(&CGM, "objc_assign_ivar", IdTy, IdTy, IdTy, PtrDiffTy, |
| NULL); |
| // id objc_assign_strongCast (id, id*) |
| StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy, |
| PtrToIdTy, NULL); |
| // id objc_assign_global(id, id*); |
| GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy, |
| NULL); |
| // id objc_assign_weak(id, id*); |
| WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy, NULL); |
| // id objc_read_weak(id*); |
| WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy, NULL); |
| // void *objc_memmove_collectable(void*, void *, size_t); |
| MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy, |
| SizeTy, NULL); |
| } |
| } |
| |
| llvm::Value *CGObjCGNU::GetClassNamed(CGBuilderTy &Builder, |
| const std::string &Name, |
| bool isWeak) { |
| llvm::Value *ClassName = CGM.GetAddrOfConstantCString(Name); |
| // With the incompatible ABI, this will need to be replaced with a direct |
| // reference to the class symbol. For the compatible nonfragile ABI we are |
| // still performing this lookup at run time but emitting the symbol for the |
| // class externally so that we can make the switch later. |
| // |
| // Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class |
| // with memoized versions or with static references if it's safe to do so. |
| if (!isWeak) |
| EmitClassRef(Name); |
| ClassName = Builder.CreateStructGEP(ClassName, 0); |
| |
| llvm::Type *ArgTys[] = { PtrToInt8Ty }; |
| llvm::Constant *ClassLookupFn = |
| CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, ArgTys, true), |
| "objc_lookup_class"); |
| return Builder.CreateCall(ClassLookupFn, ClassName); |
| } |
| |
| // This has to perform the lookup every time, since posing and related |
| // techniques can modify the name -> class mapping. |
| llvm::Value *CGObjCGNU::GetClass(CGBuilderTy &Builder, |
| const ObjCInterfaceDecl *OID) { |
| return GetClassNamed(Builder, OID->getNameAsString(), OID->isWeakImported()); |
| } |
| llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CGBuilderTy &Builder) { |
| return GetClassNamed(Builder, "NSAutoreleasePool", false); |
| } |
| |
| llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel, |
| const std::string &TypeEncoding, bool lval) { |
| |
| llvm::SmallVector<TypedSelector, 2> &Types = SelectorTable[Sel]; |
| llvm::GlobalAlias *SelValue = 0; |
| |
| |
| for (llvm::SmallVectorImpl<TypedSelector>::iterator i = Types.begin(), |
| e = Types.end() ; i!=e ; i++) { |
| if (i->first == TypeEncoding) { |
| SelValue = i->second; |
| break; |
| } |
| } |
| if (0 == SelValue) { |
| SelValue = new llvm::GlobalAlias(SelectorTy, |
| llvm::GlobalValue::PrivateLinkage, |
| ".objc_selector_"+Sel.getAsString(), NULL, |
| &TheModule); |
| Types.push_back(TypedSelector(TypeEncoding, SelValue)); |
| } |
| |
| if (lval) { |
| llvm::Value *tmp = Builder.CreateAlloca(SelValue->getType()); |
| Builder.CreateStore(SelValue, tmp); |
| return tmp; |
| } |
| return SelValue; |
| } |
| |
| llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel, |
| bool lval) { |
| return GetSelector(Builder, Sel, std::string(), lval); |
| } |
| |
| llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, const ObjCMethodDecl |
| *Method) { |
| std::string SelTypes; |
| CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes); |
| return GetSelector(Builder, Method->getSelector(), SelTypes, false); |
| } |
| |
| llvm::Constant *CGObjCGNU::GetEHType(QualType T) { |
| if (!CGM.getLangOptions().CPlusPlus) { |
| if (T->isObjCIdType() |
| || T->isObjCQualifiedIdType()) { |
| // With the old ABI, there was only one kind of catchall, which broke |
| // foreign exceptions. With the new ABI, we use __objc_id_typeinfo as |
| // a pointer indicating object catchalls, and NULL to indicate real |
| // catchalls |
| if (CGM.getLangOptions().ObjCNonFragileABI) { |
| return MakeConstantString("@id"); |
| } else { |
| return 0; |
| } |
| } |
| |
| // All other types should be Objective-C interface pointer types. |
| const ObjCObjectPointerType *OPT = |
| T->getAs<ObjCObjectPointerType>(); |
| assert(OPT && "Invalid @catch type."); |
| const ObjCInterfaceDecl *IDecl = |
| OPT->getObjectType()->getInterface(); |
| assert(IDecl && "Invalid @catch type."); |
| return MakeConstantString(IDecl->getIdentifier()->getName()); |
| } |
| // For Objective-C++, we want to provide the ability to catch both C++ and |
| // Objective-C objects in the same function. |
| |
| // There's a particular fixed type info for 'id'. |
| if (T->isObjCIdType() || |
| T->isObjCQualifiedIdType()) { |
| llvm::Constant *IDEHType = |
| CGM.getModule().getGlobalVariable("__objc_id_type_info"); |
| if (!IDEHType) |
| IDEHType = |
| new llvm::GlobalVariable(CGM.getModule(), PtrToInt8Ty, |
| false, |
| llvm::GlobalValue::ExternalLinkage, |
| 0, "__objc_id_type_info"); |
| return llvm::ConstantExpr::getBitCast(IDEHType, PtrToInt8Ty); |
| } |
| |
| const ObjCObjectPointerType *PT = |
| T->getAs<ObjCObjectPointerType>(); |
| assert(PT && "Invalid @catch type."); |
| const ObjCInterfaceType *IT = PT->getInterfaceType(); |
| assert(IT && "Invalid @catch type."); |
| std::string className = IT->getDecl()->getIdentifier()->getName(); |
| |
| std::string typeinfoName = "__objc_eh_typeinfo_" + className; |
| |
| // Return the existing typeinfo if it exists |
| llvm::Constant *typeinfo = TheModule.getGlobalVariable(typeinfoName); |
| if (typeinfo) return typeinfo; |
| |
| // Otherwise create it. |
| |
| // vtable for gnustep::libobjc::__objc_class_type_info |
| // It's quite ugly hard-coding this. Ideally we'd generate it using the host |
| // platform's name mangling. |
| const char *vtableName = "_ZTVN7gnustep7libobjc22__objc_class_type_infoE"; |
| llvm::Constant *Vtable = TheModule.getGlobalVariable(vtableName); |
| if (!Vtable) { |
| Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true, |
| llvm::GlobalValue::ExternalLinkage, 0, vtableName); |
| } |
| llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2); |
| Vtable = llvm::ConstantExpr::getGetElementPtr(Vtable, &Two, 1); |
| Vtable = llvm::ConstantExpr::getBitCast(Vtable, PtrToInt8Ty); |
| |
| llvm::Constant *typeName = |
| ExportUniqueString(className, "__objc_eh_typename_"); |
| |
| std::vector<llvm::Constant*> fields; |
| fields.push_back(Vtable); |
| fields.push_back(typeName); |
| llvm::Constant *TI = |
| MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, |
| NULL), fields, "__objc_eh_typeinfo_" + className, |
| llvm::GlobalValue::LinkOnceODRLinkage); |
| return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty); |
| } |
| |
| /// 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(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. |
| RValue |
| CGObjCGNU::GenerateMessageSendSuper(CodeGenFunction &CGF, |
| ReturnValueSlot Return, |
| QualType ResultType, |
| Selector Sel, |
| const ObjCInterfaceDecl *Class, |
| bool isCategoryImpl, |
| llvm::Value *Receiver, |
| bool IsClassMessage, |
| const CallArgList &CallArgs, |
| const ObjCMethodDecl *Method) { |
| CGBuilderTy &Builder = CGF.Builder; |
| if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) { |
| if (Sel == RetainSel || Sel == AutoreleaseSel) { |
| return RValue::get(EnforceType(Builder, Receiver, |
| CGM.getTypes().ConvertType(ResultType))); |
| } |
| if (Sel == ReleaseSel) { |
| return RValue::get(0); |
| } |
| } |
| |
| llvm::Value *cmd = GetSelector(Builder, Sel); |
| |
| |
| CallArgList ActualArgs; |
| |
| ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy); |
| ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType()); |
| ActualArgs.addFrom(CallArgs); |
| |
| CodeGenTypes &Types = CGM.getTypes(); |
| const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs, |
| FunctionType::ExtInfo()); |
| |
| llvm::Value *ReceiverClass = 0; |
| if (isCategoryImpl) { |
| llvm::Constant *classLookupFunction = 0; |
| if (IsClassMessage) { |
| llvm::Type *ArgTys[] = { PtrTy }; |
| classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| IdTy, ArgTys, true), "objc_get_meta_class"); |
| } else { |
| llvm::Type *ArgTys[] = { PtrTy }; |
| classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( |
| IdTy, ArgTys, 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(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( |
| Receiver->getType(), IdTy, NULL); |
| llvm::Value *ObjCSuper = Builder.CreateAlloca(ObjCSuperTy); |
| |
| Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0)); |
| Builder.CreateStore(ReceiverClass, Builder.CreateStructGEP(ObjCSuper, 1)); |
| |
| ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy); |
| const llvm::FunctionType *impType = |
| Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false); |
| |
| // Get the IMP |
| llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd); |
| imp = EnforceType(Builder, imp, llvm::PointerType::getUnqual(impType)); |
| |
| 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); |
| |
| 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. |
| RValue |
| CGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF, |
| ReturnValueSlot Return, |
| QualType ResultType, |
| Selector Sel, |
| llvm::Value *Receiver, |
| const CallArgList &CallArgs, |
| const ObjCInterfaceDecl *Class, |
| const ObjCMethodDecl *Method) { |
| CGBuilderTy &Builder = CGF.Builder; |
| |
| // Strip out message sends to retain / release in GC mode |
| if (CGM.getLangOptions().getGCMode() == LangOptions::GCOnly) { |
| if (Sel == RetainSel || Sel == AutoreleaseSel) { |
| return RValue::get(EnforceType(Builder, Receiver, |
| CGM.getTypes().ConvertType(ResultType))); |
| } |
| if (Sel == ReleaseSel) { |
| return RValue::get(0); |
| } |
| } |
| |
| // 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 an illegal instruction trap on SPARC. With LLVM it corrupts |
| // the stack. |
| bool isPointerSizedReturn = (ResultType->isAnyPointerType() || |
| ResultType->isIntegralOrEnumerationType() || ResultType->isVoidType()); |
| |
| 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); |
| cmd = EnforceType(Builder, cmd, SelectorTy); |
| Receiver = EnforceType(Builder, Receiver, IdTy); |
| |
| 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); |
| |
| // Get the IMP to call |
| llvm::Value *imp = LookupIMP(CGF, Receiver, cmd, node); |
| |
| CallArgList ActualArgs; |
| ActualArgs.add(RValue::get(Receiver), ASTIdTy); |
| ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType()); |
| ActualArgs.addFrom(CallArgs); |
| |
| CodeGenTypes &Types = CGM.getTypes(); |
| const CGFunctionInfo &FnInfo = Types.getFunctionInfo(ResultType, ActualArgs, |
| FunctionType::ExtInfo()); |
| const llvm::FunctionType *impType = |
| Types.GetFunctionType(FnInfo, Method ? Method->isVariadic() : false); |
| imp = EnforceType(Builder, imp, llvm::PointerType::getUnqual(impType)); |
| |
| |
| // 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); |
| 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(), 2); |
| 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(), 2); |
| 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(), 2); |
| phi->addIncoming(v.first, messageBB); |
| phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()), |
| startBB); |
| llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType(), 2); |
| 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 llvm::StringRef &ClassName, |
| const llvm::StringRef &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( |
| PtrToInt8Ty, // Really a selector, but the runtime creates it us. |
| PtrToInt8Ty, // Method types |
| IMPTy, //Method pointer |
| NULL); |
| std::vector<llvm::Constant*> Methods; |
| std::vector<llvm::Constant*> Elements; |
| for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) { |
| Elements.clear(); |
| llvm::Constant *Method = |
| TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName, |
| MethodSels[i], |
| isClassMethodList)); |
| assert(Method && "Can't generate metadata for method that doesn't exist"); |
| llvm::Constant *C = MakeConstantString(MethodSels[i].getAsString()); |
| Elements.push_back(C); |
| Elements.push_back(MethodTypes[i]); |
| Method = llvm::ConstantExpr::getBitCast(Method, |
| 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::StructType *ObjCMethodListTy = |
| llvm::StructType::createNamed(VMContext, ""); |
| llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(ObjCMethodListTy); |
| ObjCMethodListTy->setBody( |
| NextPtrTy, |
| IntTy, |
| ObjCMethodArrayTy, |
| NULL); |
| |
| 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( |
| 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(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( |
| 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)); |
| if (isMeta) { |
| llvm::TargetData td(&TheModule); |
| Elements.push_back( |
| llvm::ConstantInt::get(LongTy, |
| td.getTypeSizeInBits(ClassTy) / |
| CGM.getContext().getCharWidth())); |
| } else |
| 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( |
| 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( |
| IntTy, ObjCMethodArrayTy, NULL); |
| Methods.clear(); |
| Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size())); |
| Methods.push_back(Array); |
| return MakeGlobal(ObjCMethodDescListTy, Methods, ".objc_method_list"); |
| } |
| |
| // Create the protocol list structure used in classes, categories and so on |
| llvm::Constant *CGObjCGNU::GenerateProtocolList( |
| const llvm::SmallVectorImpl<std::string> &Protocols) { |
| llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty, |
| Protocols.size()); |
| llvm::StructType *ProtocolListTy = llvm::StructType::get( |
| PtrTy, //Should be a recurisve pointer, but it's always NULL here. |
| 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(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. |
| Elements.push_back(llvm::ConstantExpr::getIntToPtr( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| ProtocolVersion), IdTy)); |
| Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
| Elements.push_back(ProtocolList); |
| Elements.push_back(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( |
| 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::getAnon(PropertyListInitFields); |
| 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::getAnon(OptionalPropertyListInitFields); |
| 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(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. |
| Elements.push_back(llvm::ConstantExpr::getIntToPtr( |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| ProtocolVersion), IdTy)); |
| Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); |
| Elements.push_back(ProtocolList); |
| Elements.push_back(InstanceMethodList); |
| Elements.push_back(ClassMethodList); |
| 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( |
| 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(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(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( |
| 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::getAnon(PropertyListInitFields); |
| 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().getQuantity(); |
| |
| // 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().getQuantity(); |
| // 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; |
| } |
| llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset); |
| // Create the direct offset value |
| std::string OffsetName = "__objc_ivar_offset_value_" + ClassName +"." + |
| IVD->getNameAsString(); |
| llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName); |
| if (OffsetVar) { |
| OffsetVar->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. |
| OffsetVar->setLinkage(llvm::GlobalValue::ExternalLinkage); |
| } else |
| OffsetVar = new llvm::GlobalVariable(TheModule, IntTy, |
| false, llvm::GlobalValue::ExternalLinkage, |
| OffsetValue, |
| "__objc_ivar_offset_value_" + ClassName +"." + |
| IVD->getNameAsString()); |
| IvarOffsets.push_back(OffsetValue); |
| IvarOffsetValues.push_back(OffsetVar); |
| } |
| llvm::GlobalVariable *IvarOffsetArray = |
| MakeGlobalArray(PtrToIntTy, IvarOffsetValues, ".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() && SelectorTable.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; |
| if (SelStructTy == 0) { |
| SelStructTy = llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, NULL); |
| SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy); |
| } |
| |
| 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(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(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; |
| std::vector<llvm::GlobalAlias*> SelectorAliases; |
| for (SelectorMap::iterator iter = SelectorTable.begin(), |
| iterEnd = SelectorTable.end(); iter != iterEnd ; ++iter) { |
| |
| std::string SelNameStr = iter->first.getAsString(); |
| llvm::Constant *SelName = ExportUniqueString(SelNameStr, ".objc_sel_name"); |
| |
| llvm::SmallVectorImpl<TypedSelector> &Types = iter->second; |
| for (llvm::SmallVectorImpl<TypedSelector>::iterator i = Types.begin(), |
| e = Types.end() ; i!=e ; i++) { |
| |
| llvm::Constant *SelectorTypeEncoding = NULLPtr; |
| if (!i->first.empty()) |
| SelectorTypeEncoding = MakeConstantString(i->first, ".objc_sel_types"); |
| |
| Elements.push_back(SelName); |
| Elements.push_back(SelectorTypeEncoding); |
| Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements)); |
| Elements.clear(); |
| |
| // Store the selector alias for later replacement |
| SelectorAliases.push_back(i->second); |
| } |
| } |
| unsigned SelectorCount = Selectors.size(); |
| // NULL-terminate the selector list. This should not actually be required, |
| // because the selector list has a length field. Unfortunately, the GCC |
| // runtime decides to ignore the length field and expects a NULL terminator, |
| // and GCC cooperates with this by always setting the length to 0. |
| 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, SelectorCount)); |
| llvm::Constant *SelectorList = MakeGlobalArray(SelStructTy, Selectors, |
| ".objc_selector_list"); |
| Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList, |
| SelStructPtrTy)); |
| |
| // Now that all of the static selectors exist, create pointers to them. |
| for (unsigned int i=0 ; i<SelectorCount ; i++) { |
| |
| llvm::Constant *Idxs[] = {Zeros[0], |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), i), Zeros[0]}; |
| // FIXME: We're generating redundant loads and stores here! |
| llvm::Constant *SelPtr = llvm::ConstantExpr::getGetElementPtr(SelectorList, |
| Idxs, 2); |
| // If selectors are defined as an opaque type, cast the pointer to this |
| // type. |
| SelPtr = llvm::ConstantExpr::getBitCast(SelPtr, SelectorTy); |
| SelectorAliases[i]->replaceAllUsesWith(SelPtr); |
| SelectorAliases[i]->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(LongTy, LongTy, |
| PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy), |
| (RuntimeVersion >= 10) ? IntTy : NULL, NULL); |
| Elements.clear(); |
| // Runtime version, used for ABI compatibility checking. |
| Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion)); |
| // sizeof(ModuleTy) |
| llvm::TargetData td(&TheModule); |
| Elements.push_back( |
| llvm::ConstantInt::get(LongTy, |
| td.getTypeSizeInBits(ModuleTy) / |
| CGM.getContext().getCharWidth())); |
| |
| // The path to the source file where this module was declared |
| SourceManager &SM = CGM.getContext().getSourceManager(); |
| const FileEntry *mainFile = SM.getFileEntryForID(SM.getMainFileID()); |
| std::string path = |
| std::string(mainFile->getDir()->getName()) + '/' + mainFile->getName(); |
| Elements.push_back(MakeConstantString(path, ".objc_source_file_name")); |
| Elements.push_back(SymTab); |
| |
| if (RuntimeVersion >= 10) |
| switch (CGM.getLangOptions().getGCMode()) { |
| case LangOptions::GCOnly: |
| Elements.push_back(llvm::ConstantInt::get(IntTy, 2)); |
| break; |
| case LangOptions::NonGC: |
| if (CGM.getLangOptions().ObjCAutoRefCount) |
| Elements.push_back(llvm::ConstantInt::get(IntTy, 1)); |
| else |
| Elements.push_back(llvm::ConstantInt::get(IntTy, 0)); |
| break; |
| case LangOptions::HybridGC: |
| Elements.push_back(llvm::ConstantInt::get(IntTy, 1)); |
| break; |
| } |
| |
| 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); |
| |
| llvm::Type *ArgTys[] = { llvm::PointerType::getUnqual(ModuleTy) }; |
| llvm::FunctionType *FT = |
| llvm::FunctionType::get(Builder.getVoidTy(), ArgTys, true); |
| llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__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()); |
| llvm::StringRef CategoryName = OCD ? OCD->getName() : ""; |
| llvm::StringRef ClassName = CD->getName(); |
| Selector MethodName = OMD->getSelector(); |
| 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::Constant *CGObjCGNU::GetPropertyGetFunction() { |
| return GetPropertyFn; |
| } |
| |
| llvm::Constant *CGObjCGNU::GetPropertySetFunction() { |
| return SetPropertyFn; |
| } |
| |
| llvm::Constant *CGObjCGNU::GetGetStructFunction() { |
| return GetStructPropertyFn; |
| } |
| llvm::Constant *CGObjCGNU::GetSetStructFunction() { |
| return SetStructPropertyFn; |
| } |
| |
| llvm::Constant *CGObjCGNU::EnumerationMutationFunction() { |
| return EnumerationMutationFn; |
| } |
| |
| void CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF, |
| const ObjCAtSynchronizedStmt &S) { |
| EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn); |
| } |
| |
| |
| void CGObjCGNU::EmitTryStmt(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. |
| // |
| // In Objective-C++ mode, we actually emit something equivalent to the C++ |
| // exception handler. |
| EmitTryCatchStmt(CGF, S, EnterCatchFn, ExitCatchFn, ExceptionReThrowFn); |
| return ; |
| } |
| |
| void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF, |
| const ObjCAtThrowStmt &S) { |
| llvm::Value *ExceptionAsObject; |
| |
| 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(ExceptionThrowFn, ExceptionAsObject); |
| CGF.Builder.CreateUnreachable(); |
| } else { |
| CGF.Builder.CreateInvoke(ExceptionThrowFn, UnwindBB, UnwindBB, &ExceptionAsObject, |
| &ExceptionAsObject+1); |
| } |
| // Clear the insertion point to indicate we are in unreachable code. |
| CGF.Builder.ClearInsertionPoint(); |
| } |
| |
| llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF, |
| llvm::Value *AddrWeakObj) { |
| CGBuilderTy B = CGF.Builder; |
| AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy); |
| return B.CreateCall(WeakReadFn, AddrWeakObj); |
| } |
| |
| void CGObjCGNU::EmitObjCWeakAssign(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(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(CodeGenFunction &CGF, |
| llvm::Value *src, llvm::Value *dst, |
| llvm::Value *ivarOffset) { |
| CGBuilderTy B = CGF.Builder; |
| src = EnforceType(B, src, IdTy); |
| dst = EnforceType(B, dst, IdTy); |
| B.CreateCall3(IvarAssignFn, src, dst, ivarOffset); |
| } |
| |
| void CGObjCGNU::EmitObjCStrongCastAssign(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(CodeGenFunction &CGF, |
| llvm::Value *DestPtr, |
| llvm::Value *SrcPtr, |
| llvm::Value *Size) { |
| CGBuilderTy B = CGF.Builder; |
| DestPtr = EnforceType(B, DestPtr, PtrTy); |
| SrcPtr = EnforceType(B, SrcPtr, PtrTy); |
| |
| 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(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(CodeGenFunction &CGF, |
| const ObjCInterfaceDecl *Interface, |
| const ObjCIvarDecl *Ivar) { |
| if (CGM.getLangOptions().ObjCNonFragileABI) { |
| Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar); |
| if (RuntimeVersion < 10) |
| return CGF.Builder.CreateZExtOrBitCast( |
| CGF.Builder.CreateLoad(CGF.Builder.CreateLoad( |
| ObjCIvarOffsetVariable(Interface, Ivar), false, "ivar")), |
| PtrDiffTy); |
| std::string name = "__objc_ivar_offset_value_" + |
| Interface->getNameAsString() +"." + Ivar->getNameAsString(); |
| llvm::Value *Offset = TheModule.getGlobalVariable(name); |
| if (!Offset) |
| Offset = new llvm::GlobalVariable(TheModule, IntTy, |
| false, llvm::GlobalValue::CommonLinkage, |
| 0, name); |
| return CGF.Builder.CreateLoad(Offset); |
| } |
| uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar); |
| return llvm::ConstantInt::get(PtrDiffTy, Offset, "ivar"); |
| } |
| |
| CGObjCRuntime * |
| clang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) { |
| if (CGM.getLangOptions().ObjCNonFragileABI) |
| return new CGObjCGNUstep(CGM); |
| return new CGObjCGCC(CGM); |
| } |