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2906 lines
123 KiB
2906 lines
123 KiB
//===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This provides Objective-C code generation targeting the GNU runtime. The
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// class in this file generates structures used by the GNU Objective-C runtime
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// library. These structures are defined in objc/objc.h and objc/objc-api.h in
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// the GNU runtime distribution.
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//
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//===----------------------------------------------------------------------===//
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#include "CGObjCRuntime.h"
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#include "CGCleanup.h"
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/StmtObjC.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/Compiler.h"
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#include <cstdarg>
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using namespace clang;
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using namespace CodeGen;
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namespace {
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/// Class that lazily initialises the runtime function. Avoids inserting the
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/// types and the function declaration into a module if they're not used, and
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/// avoids constructing the type more than once if it's used more than once.
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class LazyRuntimeFunction {
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CodeGenModule *CGM;
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llvm::FunctionType *FTy;
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const char *FunctionName;
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llvm::Constant *Function;
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public:
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/// Constructor leaves this class uninitialized, because it is intended to
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/// be used as a field in another class and not all of the types that are
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/// used as arguments will necessarily be available at construction time.
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LazyRuntimeFunction()
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: CGM(nullptr), FunctionName(nullptr), Function(nullptr) {}
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/// Initialises the lazy function with the name, return type, and the types
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/// of the arguments.
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LLVM_END_WITH_NULL
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void init(CodeGenModule *Mod, const char *name, llvm::Type *RetTy, ...) {
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CGM = Mod;
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FunctionName = name;
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Function = nullptr;
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std::vector<llvm::Type *> ArgTys;
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va_list Args;
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va_start(Args, RetTy);
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while (llvm::Type *ArgTy = va_arg(Args, llvm::Type *))
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ArgTys.push_back(ArgTy);
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va_end(Args);
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FTy = llvm::FunctionType::get(RetTy, ArgTys, false);
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}
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llvm::FunctionType *getType() { return FTy; }
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/// Overloaded cast operator, allows the class to be implicitly cast to an
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/// LLVM constant.
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operator llvm::Constant *() {
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if (!Function) {
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if (!FunctionName)
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return nullptr;
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Function =
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cast<llvm::Constant>(CGM->CreateRuntimeFunction(FTy, FunctionName));
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}
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return Function;
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}
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operator llvm::Function *() {
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return cast<llvm::Function>((llvm::Constant *)*this);
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}
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};
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/// GNU Objective-C runtime code generation. This class implements the parts of
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/// Objective-C support that are specific to the GNU family of runtimes (GCC,
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/// GNUstep and ObjFW).
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class CGObjCGNU : public CGObjCRuntime {
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protected:
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/// The LLVM module into which output is inserted
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llvm::Module &TheModule;
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/// strut objc_super. Used for sending messages to super. This structure
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/// contains the receiver (object) and the expected class.
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llvm::StructType *ObjCSuperTy;
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/// struct objc_super*. The type of the argument to the superclass message
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/// lookup functions.
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llvm::PointerType *PtrToObjCSuperTy;
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/// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring
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/// SEL is included in a header somewhere, in which case it will be whatever
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/// type is declared in that header, most likely {i8*, i8*}.
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llvm::PointerType *SelectorTy;
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/// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the
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/// places where it's used
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llvm::IntegerType *Int8Ty;
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/// Pointer to i8 - LLVM type of char*, for all of the places where the
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/// runtime needs to deal with C strings.
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llvm::PointerType *PtrToInt8Ty;
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/// Instance Method Pointer type. This is a pointer to a function that takes,
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/// at a minimum, an object and a selector, and is the generic type for
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/// Objective-C methods. Due to differences between variadic / non-variadic
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/// calling conventions, it must always be cast to the correct type before
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/// actually being used.
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llvm::PointerType *IMPTy;
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/// Type of an untyped Objective-C object. Clang treats id as a built-in type
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/// when compiling Objective-C code, so this may be an opaque pointer (i8*),
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/// but if the runtime header declaring it is included then it may be a
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/// pointer to a structure.
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llvm::PointerType *IdTy;
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/// Pointer to a pointer to an Objective-C object. Used in the new ABI
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/// message lookup function and some GC-related functions.
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llvm::PointerType *PtrToIdTy;
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/// The clang type of id. Used when using the clang CGCall infrastructure to
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/// call Objective-C methods.
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CanQualType ASTIdTy;
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/// LLVM type for C int type.
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llvm::IntegerType *IntTy;
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/// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is
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/// used in the code to document the difference between i8* meaning a pointer
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/// to a C string and i8* meaning a pointer to some opaque type.
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llvm::PointerType *PtrTy;
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/// LLVM type for C long type. The runtime uses this in a lot of places where
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/// it should be using intptr_t, but we can't fix this without breaking
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/// compatibility with GCC...
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llvm::IntegerType *LongTy;
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/// LLVM type for C size_t. Used in various runtime data structures.
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llvm::IntegerType *SizeTy;
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/// LLVM type for C intptr_t.
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llvm::IntegerType *IntPtrTy;
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/// LLVM type for C ptrdiff_t. Mainly used in property accessor functions.
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llvm::IntegerType *PtrDiffTy;
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/// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance
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/// variables.
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llvm::PointerType *PtrToIntTy;
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/// LLVM type for Objective-C BOOL type.
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llvm::Type *BoolTy;
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/// 32-bit integer type, to save us needing to look it up every time it's used.
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llvm::IntegerType *Int32Ty;
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/// 64-bit integer type, to save us needing to look it up every time it's used.
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llvm::IntegerType *Int64Ty;
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/// Metadata kind used to tie method lookups to message sends. The GNUstep
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/// runtime provides some LLVM passes that can use this to do things like
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/// automatic IMP caching and speculative inlining.
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unsigned msgSendMDKind;
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/// Helper function that generates a constant string and returns a pointer to
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/// the start of the string. The result of this function can be used anywhere
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/// where the C code specifies const char*.
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llvm::Constant *MakeConstantString(const std::string &Str,
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const std::string &Name="") {
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ConstantAddress Array = CGM.GetAddrOfConstantCString(Str, Name.c_str());
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return llvm::ConstantExpr::getGetElementPtr(Array.getElementType(),
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Array.getPointer(), Zeros);
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}
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/// Emits a linkonce_odr string, whose name is the prefix followed by the
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/// string value. This allows the linker to combine the strings between
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/// different modules. Used for EH typeinfo names, selector strings, and a
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/// few other things.
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llvm::Constant *ExportUniqueString(const std::string &Str,
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const std::string prefix) {
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std::string name = prefix + Str;
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auto *ConstStr = TheModule.getGlobalVariable(name);
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if (!ConstStr) {
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llvm::Constant *value = llvm::ConstantDataArray::getString(VMContext,Str);
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ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true,
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llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str);
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}
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return llvm::ConstantExpr::getGetElementPtr(ConstStr->getValueType(),
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ConstStr, Zeros);
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}
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/// Generates a global structure, initialized by the elements in the vector.
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/// The element types must match the types of the structure elements in the
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/// first argument.
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llvm::GlobalVariable *MakeGlobal(llvm::StructType *Ty,
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ArrayRef<llvm::Constant *> V,
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CharUnits Align,
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StringRef Name="",
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llvm::GlobalValue::LinkageTypes linkage
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=llvm::GlobalValue::InternalLinkage) {
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llvm::Constant *C = llvm::ConstantStruct::get(Ty, V);
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auto GV = new llvm::GlobalVariable(TheModule, Ty, false,
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linkage, C, Name);
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GV->setAlignment(Align.getQuantity());
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return GV;
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}
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/// Generates a global array. The vector must contain the same number of
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/// elements that the array type declares, of the type specified as the array
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/// element type.
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llvm::GlobalVariable *MakeGlobal(llvm::ArrayType *Ty,
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ArrayRef<llvm::Constant *> V,
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CharUnits Align,
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StringRef Name="",
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llvm::GlobalValue::LinkageTypes linkage
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=llvm::GlobalValue::InternalLinkage) {
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llvm::Constant *C = llvm::ConstantArray::get(Ty, V);
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auto GV = new llvm::GlobalVariable(TheModule, Ty, false,
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linkage, C, Name);
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GV->setAlignment(Align.getQuantity());
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return GV;
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}
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/// Generates a global array, inferring the array type from the specified
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/// element type and the size of the initialiser.
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llvm::GlobalVariable *MakeGlobalArray(llvm::Type *Ty,
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ArrayRef<llvm::Constant *> V,
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CharUnits Align,
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StringRef Name="",
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llvm::GlobalValue::LinkageTypes linkage
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=llvm::GlobalValue::InternalLinkage) {
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llvm::ArrayType *ArrayTy = llvm::ArrayType::get(Ty, V.size());
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return MakeGlobal(ArrayTy, V, Align, Name, linkage);
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}
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/// Returns a property name and encoding string.
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llvm::Constant *MakePropertyEncodingString(const ObjCPropertyDecl *PD,
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const Decl *Container) {
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const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime;
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if ((R.getKind() == ObjCRuntime::GNUstep) &&
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(R.getVersion() >= VersionTuple(1, 6))) {
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std::string NameAndAttributes;
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std::string TypeStr;
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CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container, TypeStr);
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NameAndAttributes += '\0';
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NameAndAttributes += TypeStr.length() + 3;
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NameAndAttributes += TypeStr;
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NameAndAttributes += '\0';
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NameAndAttributes += PD->getNameAsString();
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return MakeConstantString(NameAndAttributes);
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}
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return MakeConstantString(PD->getNameAsString());
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}
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/// Push the property attributes into two structure fields.
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void PushPropertyAttributes(std::vector<llvm::Constant*> &Fields,
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ObjCPropertyDecl *property, bool isSynthesized=true, bool
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isDynamic=true) {
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int attrs = property->getPropertyAttributes();
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// For read-only properties, clear the copy and retain flags
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if (attrs & ObjCPropertyDecl::OBJC_PR_readonly) {
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attrs &= ~ObjCPropertyDecl::OBJC_PR_copy;
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attrs &= ~ObjCPropertyDecl::OBJC_PR_retain;
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attrs &= ~ObjCPropertyDecl::OBJC_PR_weak;
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attrs &= ~ObjCPropertyDecl::OBJC_PR_strong;
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}
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// The first flags field has the same attribute values as clang uses internally
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Fields.push_back(llvm::ConstantInt::get(Int8Ty, attrs & 0xff));
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attrs >>= 8;
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attrs <<= 2;
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// For protocol properties, synthesized and dynamic have no meaning, so we
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// reuse these flags to indicate that this is a protocol property (both set
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// has no meaning, as a property can't be both synthesized and dynamic)
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attrs |= isSynthesized ? (1<<0) : 0;
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attrs |= isDynamic ? (1<<1) : 0;
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// The second field is the next four fields left shifted by two, with the
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// low bit set to indicate whether the field is synthesized or dynamic.
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Fields.push_back(llvm::ConstantInt::get(Int8Ty, attrs & 0xff));
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// Two padding fields
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Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0));
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Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0));
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}
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/// Ensures that the value has the required type, by inserting a bitcast if
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/// required. This function lets us avoid inserting bitcasts that are
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/// redundant.
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llvm::Value* EnforceType(CGBuilderTy &B, llvm::Value *V, llvm::Type *Ty) {
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if (V->getType() == Ty) return V;
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return B.CreateBitCast(V, Ty);
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}
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Address EnforceType(CGBuilderTy &B, Address V, llvm::Type *Ty) {
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if (V.getType() == Ty) return V;
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return B.CreateBitCast(V, Ty);
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}
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// Some zeros used for GEPs in lots of places.
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llvm::Constant *Zeros[2];
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/// Null pointer value. Mainly used as a terminator in various arrays.
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llvm::Constant *NULLPtr;
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/// LLVM context.
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llvm::LLVMContext &VMContext;
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private:
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/// Placeholder for the class. Lots of things refer to the class before we've
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/// actually emitted it. We use this alias as a placeholder, and then replace
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/// it with a pointer to the class structure before finally emitting the
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/// module.
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llvm::GlobalAlias *ClassPtrAlias;
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/// Placeholder for the metaclass. Lots of things refer to the class before
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/// we've / actually emitted it. We use this alias as a placeholder, and then
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/// replace / it with a pointer to the metaclass structure before finally
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/// emitting the / module.
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llvm::GlobalAlias *MetaClassPtrAlias;
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/// All of the classes that have been generated for this compilation units.
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std::vector<llvm::Constant*> Classes;
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/// All of the categories that have been generated for this compilation units.
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std::vector<llvm::Constant*> Categories;
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/// All of the Objective-C constant strings that have been generated for this
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/// compilation units.
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std::vector<llvm::Constant*> ConstantStrings;
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/// Map from string values to Objective-C constant strings in the output.
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/// Used to prevent emitting Objective-C strings more than once. This should
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/// not be required at all - CodeGenModule should manage this list.
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llvm::StringMap<llvm::Constant*> ObjCStrings;
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/// All of the protocols that have been declared.
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llvm::StringMap<llvm::Constant*> ExistingProtocols;
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/// For each variant of a selector, we store the type encoding and a
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/// placeholder value. For an untyped selector, the type will be the empty
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/// string. Selector references are all done via the module's selector table,
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/// so we create an alias as a placeholder and then replace it with the real
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/// value later.
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typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector;
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/// Type of the selector map. This is roughly equivalent to the structure
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/// used in the GNUstep runtime, which maintains a list of all of the valid
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/// types for a selector in a table.
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typedef llvm::DenseMap<Selector, SmallVector<TypedSelector, 2> >
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SelectorMap;
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/// A map from selectors to selector types. This allows us to emit all
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/// selectors of the same name and type together.
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SelectorMap SelectorTable;
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/// Selectors related to memory management. When compiling in GC mode, we
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/// omit these.
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Selector RetainSel, ReleaseSel, AutoreleaseSel;
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/// Runtime functions used for memory management in GC mode. Note that clang
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/// supports code generation for calling these functions, but neither GNU
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/// runtime actually supports this API properly yet.
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LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn,
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WeakAssignFn, GlobalAssignFn;
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typedef std::pair<std::string, std::string> ClassAliasPair;
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/// All classes that have aliases set for them.
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std::vector<ClassAliasPair> ClassAliases;
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protected:
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/// Function used for throwing Objective-C exceptions.
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LazyRuntimeFunction ExceptionThrowFn;
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/// Function used for rethrowing exceptions, used at the end of \@finally or
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/// \@synchronize blocks.
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LazyRuntimeFunction ExceptionReThrowFn;
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/// Function called when entering a catch function. This is required for
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/// differentiating Objective-C exceptions and foreign exceptions.
|
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LazyRuntimeFunction EnterCatchFn;
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/// Function called when exiting from a catch block. Used to do exception
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/// cleanup.
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|
LazyRuntimeFunction ExitCatchFn;
|
|
/// Function called when entering an \@synchronize block. Acquires the lock.
|
|
LazyRuntimeFunction SyncEnterFn;
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|
/// Function called when exiting an \@synchronize block. Releases the lock.
|
|
LazyRuntimeFunction SyncExitFn;
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|
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private:
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/// Function called if fast enumeration detects that the collection is
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/// modified during the update.
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|
LazyRuntimeFunction EnumerationMutationFn;
|
|
/// Function for implementing synthesized property getters that return an
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/// object.
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LazyRuntimeFunction GetPropertyFn;
|
|
/// Function for implementing synthesized property setters that return an
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/// object.
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|
LazyRuntimeFunction SetPropertyFn;
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|
/// 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
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/// version in the runtime.
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|
int RuntimeVersion;
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|
/// The version of the protocol class. Used to differentiate between ObjC1
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/// and ObjC2 protocols. Objective-C 1 protocols can not contain optional
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/// components and can not contain declared properties. We always emit
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/// Objective-C 2 property structures, but we have to pretend that they're
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|
/// Objective-C 1 property structures when targeting the GCC runtime or it
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/// will abort.
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|
const int ProtocolVersion;
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/// Generates an instance variable list structure. This is a structure
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|
/// containing a size and an array of structures containing instance variable
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|
/// metadata. This is used purely for introspection in the fragile ABI. In
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|
/// the non-fragile ABI, it's used for instance variable fixup.
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|
llvm::Constant *GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
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|
ArrayRef<llvm::Constant *> IvarTypes,
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|
ArrayRef<llvm::Constant *> IvarOffsets);
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|
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|
/// Generates a method list structure. This is a structure containing a size
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|
/// and an array of structures containing method metadata.
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///
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|
/// This structure is used by both classes and categories, and contains a next
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/// pointer allowing them to be chained together in a linked list.
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|
llvm::Constant *GenerateMethodList(StringRef ClassName,
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StringRef CategoryName,
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ArrayRef<Selector> MethodSels,
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ArrayRef<llvm::Constant *> MethodTypes,
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bool isClassMethodList);
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|
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/// Emits an empty protocol. This is used for \@protocol() where no protocol
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/// is found. The runtime will (hopefully) fix up the pointer to refer to the
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/// real protocol.
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llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName);
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/// Generates a list of property metadata structures. This follows the same
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/// pattern as method and instance variable metadata lists.
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|
llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID,
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SmallVectorImpl<Selector> &InstanceMethodSels,
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SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes);
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|
|
/// Generates a list of referenced protocols. Classes, categories, and
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/// protocols all use this structure.
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|
llvm::Constant *GenerateProtocolList(ArrayRef<std::string> Protocols);
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|
|
/// To ensure that all protocols are seen by the runtime, we add a category on
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|
/// a class defined in the runtime, declaring no methods, but adopting the
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/// protocols. This is a horribly ugly hack, but it allows us to collect all
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/// of the protocols without changing the ABI.
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|
void GenerateProtocolHolderCategory();
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|
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/// Generates a class structure.
|
|
llvm::Constant *GenerateClassStructure(
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|
llvm::Constant *MetaClass,
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|
llvm::Constant *SuperClass,
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|
unsigned info,
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|
const char *Name,
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|
llvm::Constant *Version,
|
|
llvm::Constant *InstanceSize,
|
|
llvm::Constant *IVars,
|
|
llvm::Constant *Methods,
|
|
llvm::Constant *Protocols,
|
|
llvm::Constant *IvarOffsets,
|
|
llvm::Constant *Properties,
|
|
llvm::Constant *StrongIvarBitmap,
|
|
llvm::Constant *WeakIvarBitmap,
|
|
bool isMeta=false);
|
|
|
|
/// Generates a method list. This is used by protocols to define the required
|
|
/// and optional methods.
|
|
llvm::Constant *GenerateProtocolMethodList(
|
|
ArrayRef<llvm::Constant *> MethodNames,
|
|
ArrayRef<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(CodeGenFunction &CGF, Selector Sel,
|
|
const std::string &TypeEncoding);
|
|
|
|
/// 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.
|
|
|
|
protected:
|
|
void EmitClassRef(const std::string &className);
|
|
|
|
/// Emits a pointer to the named class
|
|
virtual llvm::Value *GetClassNamed(CodeGenFunction &CGF,
|
|
const std::string &Name, bool isWeak);
|
|
|
|
/// 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,
|
|
MessageSendInfo &MSI) = 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,
|
|
Address ObjCSuper,
|
|
llvm::Value *cmd,
|
|
MessageSendInfo &MSI) = 0;
|
|
|
|
/// Libobjc2 uses a bitfield representation where small(ish) bitfields are
|
|
/// stored in a 64-bit value with the low bit set to 1 and the remaining 63
|
|
/// bits set to their values, LSB first, while larger ones are stored in a
|
|
/// structure of this / form:
|
|
///
|
|
/// struct { int32_t length; int32_t values[length]; };
|
|
///
|
|
/// The values in the array are stored in host-endian format, with the least
|
|
/// significant bit being assumed to come first in the bitfield. Therefore,
|
|
/// a bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] },
|
|
/// while a bitfield / with the 63rd bit set will be 1<<64.
|
|
llvm::Constant *MakeBitField(ArrayRef<bool> bits);
|
|
|
|
public:
|
|
CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
|
|
unsigned protocolClassVersion);
|
|
|
|
ConstantAddress GenerateConstantString(const StringLiteral *) override;
|
|
|
|
RValue
|
|
GenerateMessageSend(CodeGenFunction &CGF, ReturnValueSlot Return,
|
|
QualType ResultType, Selector Sel,
|
|
llvm::Value *Receiver, const CallArgList &CallArgs,
|
|
const ObjCInterfaceDecl *Class,
|
|
const ObjCMethodDecl *Method) override;
|
|
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) override;
|
|
llvm::Value *GetClass(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *OID) override;
|
|
llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override;
|
|
Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override;
|
|
llvm::Value *GetSelector(CodeGenFunction &CGF,
|
|
const ObjCMethodDecl *Method) override;
|
|
llvm::Constant *GetEHType(QualType T) override;
|
|
|
|
llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) override;
|
|
void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
|
|
void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
|
|
void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override;
|
|
llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
|
|
const ObjCProtocolDecl *PD) override;
|
|
void GenerateProtocol(const ObjCProtocolDecl *PD) override;
|
|
llvm::Function *ModuleInitFunction() override;
|
|
llvm::Constant *GetPropertyGetFunction() override;
|
|
llvm::Constant *GetPropertySetFunction() override;
|
|
llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) override;
|
|
llvm::Constant *GetSetStructFunction() override;
|
|
llvm::Constant *GetGetStructFunction() override;
|
|
llvm::Constant *GetCppAtomicObjectGetFunction() override;
|
|
llvm::Constant *GetCppAtomicObjectSetFunction() override;
|
|
llvm::Constant *EnumerationMutationFunction() override;
|
|
|
|
void EmitTryStmt(CodeGenFunction &CGF,
|
|
const ObjCAtTryStmt &S) override;
|
|
void EmitSynchronizedStmt(CodeGenFunction &CGF,
|
|
const ObjCAtSynchronizedStmt &S) override;
|
|
void EmitThrowStmt(CodeGenFunction &CGF,
|
|
const ObjCAtThrowStmt &S,
|
|
bool ClearInsertionPoint=true) override;
|
|
llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF,
|
|
Address AddrWeakObj) override;
|
|
void EmitObjCWeakAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst) override;
|
|
void EmitObjCGlobalAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest,
|
|
bool threadlocal=false) override;
|
|
void EmitObjCIvarAssign(CodeGenFunction &CGF, llvm::Value *src,
|
|
Address dest, llvm::Value *ivarOffset) override;
|
|
void EmitObjCStrongCastAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest) override;
|
|
void EmitGCMemmoveCollectable(CodeGenFunction &CGF, Address DestPtr,
|
|
Address SrcPtr,
|
|
llvm::Value *Size) override;
|
|
LValue EmitObjCValueForIvar(CodeGenFunction &CGF, QualType ObjectTy,
|
|
llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
|
|
unsigned CVRQualifiers) override;
|
|
llvm::Value *EmitIvarOffset(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) override;
|
|
llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
|
|
llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM,
|
|
const CGBlockInfo &blockInfo) override {
|
|
return NULLPtr;
|
|
}
|
|
llvm::Constant *BuildRCBlockLayout(CodeGenModule &CGM,
|
|
const CGBlockInfo &blockInfo) override {
|
|
return NULLPtr;
|
|
}
|
|
|
|
llvm::Constant *BuildByrefLayout(CodeGenModule &CGM, QualType T) override {
|
|
return NULLPtr;
|
|
}
|
|
|
|
llvm::GlobalVariable *GetClassGlobal(StringRef Name,
|
|
bool Weak = false) override {
|
|
return nullptr;
|
|
}
|
|
};
|
|
|
|
/// 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:
|
|
llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
|
|
llvm::Value *cmd, llvm::MDNode *node,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *args[] = {
|
|
EnforceType(Builder, Receiver, IdTy),
|
|
EnforceType(Builder, cmd, SelectorTy) };
|
|
llvm::CallSite imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args);
|
|
imp->setMetadata(msgSendMDKind, node);
|
|
return imp.getInstruction();
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd, MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper,
|
|
PtrToObjCSuperTy).getPointer(), cmd};
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
|
|
}
|
|
|
|
public:
|
|
CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) {
|
|
// IMP objc_msg_lookup(id, SEL);
|
|
MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy,
|
|
nullptr);
|
|
// IMP objc_msg_lookup_super(struct objc_super*, SEL);
|
|
MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy, nullptr);
|
|
}
|
|
};
|
|
|
|
/// 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;
|
|
/// Specialised function for setting atomic retain properties
|
|
LazyRuntimeFunction SetPropertyAtomic;
|
|
/// Specialised function for setting atomic copy properties
|
|
LazyRuntimeFunction SetPropertyAtomicCopy;
|
|
/// Specialised function for setting nonatomic retain properties
|
|
LazyRuntimeFunction SetPropertyNonAtomic;
|
|
/// Specialised function for setting nonatomic copy properties
|
|
LazyRuntimeFunction SetPropertyNonAtomicCopy;
|
|
/// Function to perform atomic copies of C++ objects with nontrivial copy
|
|
/// constructors from Objective-C ivars.
|
|
LazyRuntimeFunction CxxAtomicObjectGetFn;
|
|
/// Function to perform atomic copies of C++ objects with nontrivial copy
|
|
/// constructors to Objective-C ivars.
|
|
LazyRuntimeFunction CxxAtomicObjectSetFn;
|
|
/// Type of an slot structure pointer. This is returned by the various
|
|
/// lookup functions.
|
|
llvm::Type *SlotTy;
|
|
|
|
public:
|
|
llvm::Constant *GetEHType(QualType T) override;
|
|
|
|
protected:
|
|
llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
|
|
llvm::Value *cmd, llvm::MDNode *node,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Function *LookupFn = SlotLookupFn;
|
|
|
|
// Store the receiver on the stack so that we can reload it later
|
|
Address ReceiverPtr =
|
|
CGF.CreateTempAlloca(Receiver->getType(), CGF.getPointerAlign());
|
|
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::Value *args[] = {
|
|
EnforceType(Builder, ReceiverPtr.getPointer(), PtrToIdTy),
|
|
EnforceType(Builder, cmd, SelectorTy),
|
|
EnforceType(Builder, self, IdTy) };
|
|
llvm::CallSite slot = CGF.EmitRuntimeCallOrInvoke(LookupFn, args);
|
|
slot.setOnlyReadsMemory();
|
|
slot->setMetadata(msgSendMDKind, node);
|
|
|
|
// Load the imp from the slot
|
|
llvm::Value *imp = Builder.CreateAlignedLoad(
|
|
Builder.CreateStructGEP(nullptr, slot.getInstruction(), 4),
|
|
CGF.getPointerAlign());
|
|
|
|
// The lookup function may have changed the receiver, so make sure we use
|
|
// the new one.
|
|
Receiver = Builder.CreateLoad(ReceiverPtr, true);
|
|
return imp;
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {ObjCSuper.getPointer(), cmd};
|
|
|
|
llvm::CallInst *slot =
|
|
CGF.EmitNounwindRuntimeCall(SlotLookupSuperFn, lookupArgs);
|
|
slot->setOnlyReadsMemory();
|
|
|
|
return Builder.CreateAlignedLoad(Builder.CreateStructGEP(nullptr, slot, 4),
|
|
CGF.getPointerAlign());
|
|
}
|
|
|
|
public:
|
|
CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNU(Mod, 9, 3) {
|
|
const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime;
|
|
|
|
llvm::StructType *SlotStructTy = llvm::StructType::get(PtrTy,
|
|
PtrTy, PtrTy, IntTy, IMPTy, nullptr);
|
|
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, nullptr);
|
|
// Slot_t objc_msg_lookup_super(struct objc_super*, SEL);
|
|
SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy,
|
|
PtrToObjCSuperTy, SelectorTy, nullptr);
|
|
// If we're in ObjC++ mode, then we want to make
|
|
if (CGM.getLangOpts().CPlusPlus) {
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
// void *__cxa_begin_catch(void *e)
|
|
EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy, nullptr);
|
|
// void __cxa_end_catch(void)
|
|
ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy, nullptr);
|
|
// void _Unwind_Resume_or_Rethrow(void*)
|
|
ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy,
|
|
PtrTy, nullptr);
|
|
} else if (R.getVersion() >= VersionTuple(1, 7)) {
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
// id objc_begin_catch(void *e)
|
|
EnterCatchFn.init(&CGM, "objc_begin_catch", IdTy, PtrTy, nullptr);
|
|
// void objc_end_catch(void)
|
|
ExitCatchFn.init(&CGM, "objc_end_catch", VoidTy, nullptr);
|
|
// void _Unwind_Resume_or_Rethrow(void*)
|
|
ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy,
|
|
PtrTy, nullptr);
|
|
}
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
SetPropertyAtomic.init(&CGM, "objc_setProperty_atomic", VoidTy, IdTy,
|
|
SelectorTy, IdTy, PtrDiffTy, nullptr);
|
|
SetPropertyAtomicCopy.init(&CGM, "objc_setProperty_atomic_copy", VoidTy,
|
|
IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr);
|
|
SetPropertyNonAtomic.init(&CGM, "objc_setProperty_nonatomic", VoidTy,
|
|
IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr);
|
|
SetPropertyNonAtomicCopy.init(&CGM, "objc_setProperty_nonatomic_copy",
|
|
VoidTy, IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr);
|
|
// void objc_setCppObjectAtomic(void *dest, const void *src, void
|
|
// *helper);
|
|
CxxAtomicObjectSetFn.init(&CGM, "objc_setCppObjectAtomic", VoidTy, PtrTy,
|
|
PtrTy, PtrTy, nullptr);
|
|
// void objc_getCppObjectAtomic(void *dest, const void *src, void
|
|
// *helper);
|
|
CxxAtomicObjectGetFn.init(&CGM, "objc_getCppObjectAtomic", VoidTy, PtrTy,
|
|
PtrTy, PtrTy, nullptr);
|
|
}
|
|
|
|
llvm::Constant *GetCppAtomicObjectGetFunction() override {
|
|
// The optimised functions were added in version 1.7 of the GNUstep
|
|
// runtime.
|
|
assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
|
|
VersionTuple(1, 7));
|
|
return CxxAtomicObjectGetFn;
|
|
}
|
|
|
|
llvm::Constant *GetCppAtomicObjectSetFunction() override {
|
|
// The optimised functions were added in version 1.7 of the GNUstep
|
|
// runtime.
|
|
assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
|
|
VersionTuple(1, 7));
|
|
return CxxAtomicObjectSetFn;
|
|
}
|
|
|
|
llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) override {
|
|
// The optimised property functions omit the GC check, and so are not
|
|
// safe to use in GC mode. The standard functions are fast in GC mode,
|
|
// so there is less advantage in using them.
|
|
assert ((CGM.getLangOpts().getGC() == LangOptions::NonGC));
|
|
// The optimised functions were added in version 1.7 of the GNUstep
|
|
// runtime.
|
|
assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
|
|
VersionTuple(1, 7));
|
|
|
|
if (atomic) {
|
|
if (copy) return SetPropertyAtomicCopy;
|
|
return SetPropertyAtomic;
|
|
}
|
|
|
|
return copy ? SetPropertyNonAtomicCopy : SetPropertyNonAtomic;
|
|
}
|
|
};
|
|
|
|
/// Support for the ObjFW runtime.
|
|
class CGObjCObjFW: public CGObjCGNU {
|
|
protected:
|
|
/// The GCC ABI message lookup function. Returns an IMP pointing to the
|
|
/// method implementation for this message.
|
|
LazyRuntimeFunction MsgLookupFn;
|
|
/// stret lookup function. While this does not seem to make sense at the
|
|
/// first look, this is required to call the correct forwarding function.
|
|
LazyRuntimeFunction MsgLookupFnSRet;
|
|
/// 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, MsgLookupSuperFnSRet;
|
|
|
|
llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
|
|
llvm::Value *cmd, llvm::MDNode *node,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *args[] = {
|
|
EnforceType(Builder, Receiver, IdTy),
|
|
EnforceType(Builder, cmd, SelectorTy) };
|
|
|
|
llvm::CallSite imp;
|
|
if (CGM.ReturnTypeUsesSRet(MSI.CallInfo))
|
|
imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFnSRet, args);
|
|
else
|
|
imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args);
|
|
|
|
imp->setMetadata(msgSendMDKind, node);
|
|
return imp.getInstruction();
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd, MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper.getPointer(),
|
|
PtrToObjCSuperTy), cmd};
|
|
|
|
if (CGM.ReturnTypeUsesSRet(MSI.CallInfo))
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFnSRet, lookupArgs);
|
|
else
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
|
|
}
|
|
|
|
llvm::Value *GetClassNamed(CodeGenFunction &CGF,
|
|
const std::string &Name, bool isWeak) override {
|
|
if (isWeak)
|
|
return CGObjCGNU::GetClassNamed(CGF, Name, isWeak);
|
|
|
|
EmitClassRef(Name);
|
|
|
|
std::string SymbolName = "_OBJC_CLASS_" + Name;
|
|
|
|
llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(SymbolName);
|
|
|
|
if (!ClassSymbol)
|
|
ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, SymbolName);
|
|
|
|
return ClassSymbol;
|
|
}
|
|
|
|
public:
|
|
CGObjCObjFW(CodeGenModule &Mod): CGObjCGNU(Mod, 9, 3) {
|
|
// IMP objc_msg_lookup(id, SEL);
|
|
MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy, nullptr);
|
|
MsgLookupFnSRet.init(&CGM, "objc_msg_lookup_stret", IMPTy, IdTy,
|
|
SelectorTy, nullptr);
|
|
// IMP objc_msg_lookup_super(struct objc_super*, SEL);
|
|
MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy, nullptr);
|
|
MsgLookupSuperFnSRet.init(&CGM, "objc_msg_lookup_super_stret", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy, nullptr);
|
|
}
|
|
};
|
|
} // 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,
|
|
nullptr, symbolName);
|
|
}
|
|
new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true,
|
|
llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef);
|
|
}
|
|
|
|
static std::string SymbolNameForMethod( StringRef ClassName,
|
|
StringRef CategoryName, const Selector MethodName,
|
|
bool isClassMethod) {
|
|
std::string MethodNameColonStripped = MethodName.getAsString();
|
|
std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(),
|
|
':', '_');
|
|
return (Twine(isClassMethod ? "_c_" : "_i_") + ClassName + "_" +
|
|
CategoryName + "_" + MethodNameColonStripped).str();
|
|
}
|
|
|
|
CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
|
|
unsigned protocolClassVersion)
|
|
: CGObjCRuntime(cgm), TheModule(CGM.getModule()),
|
|
VMContext(cgm.getLLVMContext()), ClassPtrAlias(nullptr),
|
|
MetaClassPtrAlias(nullptr), 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;
|
|
|
|
Int32Ty = llvm::Type::getInt32Ty(VMContext);
|
|
Int64Ty = llvm::Type::getInt64Ty(VMContext);
|
|
|
|
IntPtrTy =
|
|
CGM.getDataLayout().getPointerSizeInBits() == 32 ? Int32Ty : Int64Ty;
|
|
|
|
// 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, nullptr);
|
|
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, nullptr);
|
|
ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, nullptr);
|
|
// int objc_sync_enter(id);
|
|
SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy, nullptr);
|
|
// int objc_sync_exit(id);
|
|
SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy, nullptr);
|
|
|
|
// void objc_enumerationMutation (id)
|
|
EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy,
|
|
IdTy, nullptr);
|
|
|
|
// id objc_getProperty(id, SEL, ptrdiff_t, BOOL)
|
|
GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy,
|
|
PtrDiffTy, BoolTy, nullptr);
|
|
// void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL)
|
|
SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy,
|
|
PtrDiffTy, IdTy, BoolTy, BoolTy, nullptr);
|
|
// void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
|
|
GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy,
|
|
PtrDiffTy, BoolTy, BoolTy, nullptr);
|
|
// void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
|
|
SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy,
|
|
PtrDiffTy, BoolTy, BoolTy, nullptr);
|
|
|
|
// IMP type
|
|
llvm::Type *IMPArgs[] = { IdTy, SelectorTy };
|
|
IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs,
|
|
true));
|
|
|
|
const LangOptions &Opts = CGM.getLangOpts();
|
|
if ((Opts.getGC() != LangOptions::NonGC) || Opts.ObjCAutoRefCount)
|
|
RuntimeVersion = 10;
|
|
|
|
// Don't bother initialising the GC stuff unless we're compiling in GC mode
|
|
if (Opts.getGC() != 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,
|
|
nullptr);
|
|
// id objc_assign_strongCast (id, id*)
|
|
StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy,
|
|
PtrToIdTy, nullptr);
|
|
// id objc_assign_global(id, id*);
|
|
GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy,
|
|
nullptr);
|
|
// id objc_assign_weak(id, id*);
|
|
WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy, nullptr);
|
|
// id objc_read_weak(id*);
|
|
WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy, nullptr);
|
|
// void *objc_memmove_collectable(void*, void *, size_t);
|
|
MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy,
|
|
SizeTy, nullptr);
|
|
}
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetClassNamed(CodeGenFunction &CGF,
|
|
const std::string &Name,
|
|
bool isWeak) {
|
|
llvm::Constant *ClassName = MakeConstantString(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);
|
|
|
|
llvm::Constant *ClassLookupFn =
|
|
CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, PtrToInt8Ty, true),
|
|
"objc_lookup_class");
|
|
return CGF.EmitNounwindRuntimeCall(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(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *OID) {
|
|
return GetClassNamed(CGF, OID->getNameAsString(), OID->isWeakImported());
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
|
|
return GetClassNamed(CGF, "NSAutoreleasePool", false);
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel,
|
|
const std::string &TypeEncoding) {
|
|
SmallVectorImpl<TypedSelector> &Types = SelectorTable[Sel];
|
|
llvm::GlobalAlias *SelValue = nullptr;
|
|
|
|
for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
|
|
e = Types.end() ; i!=e ; i++) {
|
|
if (i->first == TypeEncoding) {
|
|
SelValue = i->second;
|
|
break;
|
|
}
|
|
}
|
|
if (!SelValue) {
|
|
SelValue = llvm::GlobalAlias::create(
|
|
SelectorTy->getElementType(), 0, llvm::GlobalValue::PrivateLinkage,
|
|
".objc_selector_" + Sel.getAsString(), &TheModule);
|
|
Types.emplace_back(TypeEncoding, SelValue);
|
|
}
|
|
|
|
return SelValue;
|
|
}
|
|
|
|
Address CGObjCGNU::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) {
|
|
llvm::Value *SelValue = GetSelector(CGF, Sel);
|
|
|
|
// Store it to a temporary. Does this satisfy the semantics of
|
|
// GetAddrOfSelector? Hopefully.
|
|
Address tmp = CGF.CreateTempAlloca(SelValue->getType(),
|
|
CGF.getPointerAlign());
|
|
CGF.Builder.CreateStore(SelValue, tmp);
|
|
return tmp;
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel) {
|
|
return GetSelector(CGF, Sel, std::string());
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF,
|
|
const ObjCMethodDecl *Method) {
|
|
std::string SelTypes;
|
|
CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes);
|
|
return GetSelector(CGF, Method->getSelector(), SelTypes);
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GetEHType(QualType T) {
|
|
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.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
return MakeConstantString("@id");
|
|
} else {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// 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());
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNUstep::GetEHType(QualType T) {
|
|
if (!CGM.getLangOpts().CPlusPlus)
|
|
return CGObjCGNU::GetEHType(T);
|
|
|
|
// 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,
|
|
nullptr, "__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 llvm::ConstantExpr::getBitCast(typeinfo, PtrToInt8Ty);
|
|
|
|
// 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";
|
|
auto *Vtable = TheModule.getGlobalVariable(vtableName);
|
|
if (!Vtable) {
|
|
Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, vtableName);
|
|
}
|
|
llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2);
|
|
auto *BVtable = llvm::ConstantExpr::getBitCast(
|
|
llvm::ConstantExpr::getGetElementPtr(Vtable->getValueType(), Vtable, Two),
|
|
PtrToInt8Ty);
|
|
|
|
llvm::Constant *typeName =
|
|
ExportUniqueString(className, "__objc_eh_typename_");
|
|
|
|
std::vector<llvm::Constant*> fields;
|
|
fields.push_back(BVtable);
|
|
fields.push_back(typeName);
|
|
llvm::Constant *TI =
|
|
MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, nullptr),
|
|
fields, CGM.getPointerAlign(),
|
|
"__objc_eh_typeinfo_" + className,
|
|
llvm::GlobalValue::LinkOnceODRLinkage);
|
|
return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty);
|
|
}
|
|
|
|
/// Generate an NSConstantString object.
|
|
ConstantAddress CGObjCGNU::GenerateConstantString(const StringLiteral *SL) {
|
|
|
|
std::string Str = SL->getString().str();
|
|
CharUnits Align = CGM.getPointerAlign();
|
|
|
|
// Look for an existing one
|
|
llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str);
|
|
if (old != ObjCStrings.end())
|
|
return ConstantAddress(old->getValue(), Align);
|
|
|
|
StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass;
|
|
|
|
if (StringClass.empty()) StringClass = "NXConstantString";
|
|
|
|
std::string Sym = "_OBJC_CLASS_";
|
|
Sym += StringClass;
|
|
|
|
llvm::Constant *isa = TheModule.getNamedGlobal(Sym);
|
|
|
|
if (!isa)
|
|
isa = new llvm::GlobalVariable(TheModule, IdTy, /* isConstant */false,
|
|
llvm::GlobalValue::ExternalWeakLinkage, nullptr, Sym);
|
|
else if (isa->getType() != PtrToIdTy)
|
|
isa = llvm::ConstantExpr::getBitCast(isa, PtrToIdTy);
|
|
|
|
std::vector<llvm::Constant*> Ivars;
|
|
Ivars.push_back(isa);
|
|
Ivars.push_back(MakeConstantString(Str));
|
|
Ivars.push_back(llvm::ConstantInt::get(IntTy, Str.size()));
|
|
llvm::Constant *ObjCStr = MakeGlobal(
|
|
llvm::StructType::get(PtrToIdTy, PtrToInt8Ty, IntTy, nullptr),
|
|
Ivars, Align, ".objc_str");
|
|
ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty);
|
|
ObjCStrings[Str] = ObjCStr;
|
|
ConstantStrings.push_back(ObjCStr);
|
|
return ConstantAddress(ObjCStr, Align);
|
|
}
|
|
|
|
///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.getLangOpts().getGC() == LangOptions::GCOnly) {
|
|
if (Sel == RetainSel || Sel == AutoreleaseSel) {
|
|
return RValue::get(EnforceType(Builder, Receiver,
|
|
CGM.getTypes().ConvertType(ResultType)));
|
|
}
|
|
if (Sel == ReleaseSel) {
|
|
return RValue::get(nullptr);
|
|
}
|
|
}
|
|
|
|
llvm::Value *cmd = GetSelector(CGF, Sel);
|
|
CallArgList ActualArgs;
|
|
|
|
ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy);
|
|
ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
|
|
ActualArgs.addFrom(CallArgs);
|
|
|
|
MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
|
|
|
|
llvm::Value *ReceiverClass = nullptr;
|
|
if (isCategoryImpl) {
|
|
llvm::Constant *classLookupFunction = nullptr;
|
|
if (IsClassMessage) {
|
|
classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
|
|
IdTy, PtrTy, true), "objc_get_meta_class");
|
|
} else {
|
|
classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
|
|
IdTy, PtrTy, 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 = llvm::GlobalAlias::create(
|
|
IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage,
|
|
".objc_metaclass_ref" + Class->getNameAsString(), &TheModule);
|
|
}
|
|
ReceiverClass = MetaClassPtrAlias;
|
|
} else {
|
|
if (!ClassPtrAlias) {
|
|
ClassPtrAlias = llvm::GlobalAlias::create(
|
|
IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage,
|
|
".objc_class_ref" + Class->getNameAsString(), &TheModule);
|
|
}
|
|
ReceiverClass = ClassPtrAlias;
|
|
}
|
|
}
|
|
// Cast the pointer to a simplified version of the class structure
|
|
llvm::Type *CastTy = llvm::StructType::get(IdTy, IdTy, nullptr);
|
|
ReceiverClass = Builder.CreateBitCast(ReceiverClass,
|
|
llvm::PointerType::getUnqual(CastTy));
|
|
// Get the superclass pointer
|
|
ReceiverClass = Builder.CreateStructGEP(CastTy, ReceiverClass, 1);
|
|
// Load the superclass pointer
|
|
ReceiverClass =
|
|
Builder.CreateAlignedLoad(ReceiverClass, CGF.getPointerAlign());
|
|
// Construct the structure used to look up the IMP
|
|
llvm::StructType *ObjCSuperTy = llvm::StructType::get(
|
|
Receiver->getType(), IdTy, nullptr);
|
|
|
|
// FIXME: Is this really supposed to be a dynamic alloca?
|
|
Address ObjCSuper = Address(Builder.CreateAlloca(ObjCSuperTy),
|
|
CGF.getPointerAlign());
|
|
|
|
Builder.CreateStore(Receiver,
|
|
Builder.CreateStructGEP(ObjCSuper, 0, CharUnits::Zero()));
|
|
Builder.CreateStore(ReceiverClass,
|
|
Builder.CreateStructGEP(ObjCSuper, 1, CGF.getPointerSize()));
|
|
|
|
ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy);
|
|
|
|
// Get the IMP
|
|
llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd, MSI);
|
|
imp = EnforceType(Builder, imp, MSI.MessengerType);
|
|
|
|
llvm::Metadata *impMD[] = {
|
|
llvm::MDString::get(VMContext, Sel.getAsString()),
|
|
llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()),
|
|
llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
|
|
llvm::Type::getInt1Ty(VMContext), IsClassMessage))};
|
|
llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
|
|
|
|
llvm::Instruction *call;
|
|
RValue msgRet = CGF.EmitCall(MSI.CallInfo, imp, Return, ActualArgs,
|
|
CGCalleeInfo(), &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.getLangOpts().getGC() == LangOptions::GCOnly) {
|
|
if (Sel == RetainSel || Sel == AutoreleaseSel) {
|
|
return RValue::get(EnforceType(Builder, Receiver,
|
|
CGM.getTypes().ConvertType(ResultType)));
|
|
}
|
|
if (Sel == ReleaseSel) {
|
|
return RValue::get(nullptr);
|
|
}
|
|
}
|
|
|
|
// 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 = nullptr;
|
|
llvm::BasicBlock *messageBB = nullptr;
|
|
llvm::BasicBlock *continueBB = nullptr;
|
|
|
|
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(CGF, Method);
|
|
else
|
|
cmd = GetSelector(CGF, Sel);
|
|
cmd = EnforceType(Builder, cmd, SelectorTy);
|
|
Receiver = EnforceType(Builder, Receiver, IdTy);
|
|
|
|
llvm::Metadata *impMD[] = {
|
|
llvm::MDString::get(VMContext, Sel.getAsString()),
|
|
llvm::MDString::get(VMContext, Class ? Class->getNameAsString() : ""),
|
|
llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
|
|
llvm::Type::getInt1Ty(VMContext), Class != nullptr))};
|
|
llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
|
|
|
|
CallArgList ActualArgs;
|
|
ActualArgs.add(RValue::get(Receiver), ASTIdTy);
|
|
ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
|
|
ActualArgs.addFrom(CallArgs);
|
|
|
|
MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
|
|
|
|
// Get the IMP to call
|
|
llvm::Value *imp;
|
|
|
|
// If we have non-legacy dispatch specified, we try using the objc_msgSend()
|
|
// functions. These are not supported on all platforms (or all runtimes on a
|
|
// given platform), so we
|
|
switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) {
|
|
case CodeGenOptions::Legacy:
|
|
imp = LookupIMP(CGF, Receiver, cmd, node, MSI);
|
|
break;
|
|
case CodeGenOptions::Mixed:
|
|
case CodeGenOptions::NonLegacy:
|
|
if (CGM.ReturnTypeUsesFPRet(ResultType)) {
|
|
imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
|
|
"objc_msgSend_fpret");
|
|
} else if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) {
|
|
// The actual types here don't matter - we're going to bitcast the
|
|
// function anyway
|
|
imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
|
|
"objc_msgSend_stret");
|
|
} else {
|
|
imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
|
|
"objc_msgSend");
|
|
}
|
|
}
|
|
|
|
// Reset the receiver in case the lookup modified it
|
|
ActualArgs[0] = CallArg(RValue::get(Receiver), ASTIdTy, false);
|
|
|
|
imp = EnforceType(Builder, imp, MSI.MessengerType);
|
|
|
|
llvm::Instruction *call;
|
|
RValue msgRet = CGF.EmitCall(MSI.CallInfo, imp, Return, ActualArgs,
|
|
CGCalleeInfo(), &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()) {
|
|
Address v = msgRet.getAggregateAddress();
|
|
llvm::PHINode *phi = Builder.CreatePHI(v.getType(), 2);
|
|
llvm::Type *RetTy = v.getElementType();
|
|
Address NullVal = CGF.CreateTempAlloca(RetTy, v.getAlignment(), "null");
|
|
CGF.InitTempAlloca(NullVal, llvm::Constant::getNullValue(RetTy));
|
|
phi->addIncoming(v.getPointer(), messageBB);
|
|
phi->addIncoming(NullVal.getPointer(), startBB);
|
|
msgRet = RValue::getAggregate(Address(phi, v.getAlignment()));
|
|
} 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(StringRef ClassName,
|
|
StringRef CategoryName,
|
|
ArrayRef<Selector> MethodSels,
|
|
ArrayRef<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
|
|
nullptr);
|
|
std::vector<llvm::Constant*> Methods;
|
|
for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) {
|
|
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());
|
|
Method = llvm::ConstantExpr::getBitCast(Method,
|
|
IMPTy);
|
|
Methods.push_back(
|
|
llvm::ConstantStruct::get(ObjCMethodTy, {C, MethodTypes[i], Method}));
|
|
}
|
|
|
|
// 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::create(VMContext);
|
|
llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(ObjCMethodListTy);
|
|
ObjCMethodListTy->setBody(
|
|
NextPtrTy,
|
|
IntTy,
|
|
ObjCMethodArrayTy,
|
|
nullptr);
|
|
|
|
Methods.clear();
|
|
Methods.push_back(llvm::ConstantPointerNull::get(
|
|
llvm::PointerType::getUnqual(ObjCMethodListTy)));
|
|
Methods.push_back(llvm::ConstantInt::get(Int32Ty, MethodTypes.size()));
|
|
Methods.push_back(MethodArray);
|
|
|
|
// Create an instance of the structure
|
|
return MakeGlobal(ObjCMethodListTy, Methods, CGM.getPointerAlign(),
|
|
".objc_method_list");
|
|
}
|
|
|
|
/// Generates an IvarList. Used in construction of a objc_class.
|
|
llvm::Constant *CGObjCGNU::
|
|
GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
|
|
ArrayRef<llvm::Constant *> IvarTypes,
|
|
ArrayRef<llvm::Constant *> IvarOffsets) {
|
|
if (IvarNames.size() == 0)
|
|
return NULLPtr;
|
|
// Get the method structure type.
|
|
llvm::StructType *ObjCIvarTy = llvm::StructType::get(
|
|
PtrToInt8Ty,
|
|
PtrToInt8Ty,
|
|
IntTy,
|
|
nullptr);
|
|
std::vector<llvm::Constant*> Ivars;
|
|
for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) {
|
|
Ivars.push_back(llvm::ConstantStruct::get(
|
|
ObjCIvarTy, {IvarNames[i], IvarTypes[i], IvarOffsets[i]}));
|
|
}
|
|
|
|
// Array of method structures
|
|
llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy,
|
|
IvarNames.size());
|
|
|
|
llvm::Constant *Elements[] = {
|
|
llvm::ConstantInt::get(IntTy, (int)IvarNames.size()),
|
|
llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars)};
|
|
// Structure containing array and array count
|
|
llvm::StructType *ObjCIvarListTy = llvm::StructType::get(IntTy,
|
|
ObjCIvarArrayTy,
|
|
nullptr);
|
|
|
|
// Create an instance of the structure
|
|
return MakeGlobal(ObjCIvarListTy, Elements, CGM.getPointerAlign(),
|
|
".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,
|
|
llvm::Constant *StrongIvarBitmap,
|
|
llvm::Constant *WeakIvarBitmap,
|
|
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, // isa
|
|
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
|
|
IntPtrTy, // strong_pointers
|
|
IntPtrTy, // weak_pointers
|
|
nullptr);
|
|
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::DataLayout 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(llvm::ConstantInt::get(LongTy, 1));
|
|
Elements.push_back(IvarOffsets);
|
|
Elements.push_back(Properties);
|
|
Elements.push_back(StrongIvarBitmap);
|
|
Elements.push_back(WeakIvarBitmap);
|
|
// 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. We may already have some weak references to
|
|
// this, so check and fix them properly.
|
|
std::string ClassSym((isMeta ? "_OBJC_METACLASS_": "_OBJC_CLASS_") +
|
|
std::string(Name));
|
|
llvm::GlobalVariable *ClassRef = TheModule.getNamedGlobal(ClassSym);
|
|
llvm::Constant *Class =
|
|
MakeGlobal(ClassTy, Elements, CGM.getPointerAlign(), ClassSym,
|
|
llvm::GlobalValue::ExternalLinkage);
|
|
if (ClassRef) {
|
|
ClassRef->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(Class,
|
|
ClassRef->getType()));
|
|
ClassRef->removeFromParent();
|
|
Class->setName(ClassSym);
|
|
}
|
|
return Class;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::
|
|
GenerateProtocolMethodList(ArrayRef<llvm::Constant *> MethodNames,
|
|
ArrayRef<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,
|
|
nullptr);
|
|
std::vector<llvm::Constant*> Methods;
|
|
for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) {
|
|
Methods.push_back(llvm::ConstantStruct::get(
|
|
ObjCMethodDescTy, {MethodNames[i], MethodTypes[i]}));
|
|
}
|
|
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, nullptr);
|
|
Methods.clear();
|
|
Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size()));
|
|
Methods.push_back(Array);
|
|
return MakeGlobal(ObjCMethodDescListTy, Methods, CGM.getPointerAlign(),
|
|
".objc_method_list");
|
|
}
|
|
|
|
// Create the protocol list structure used in classes, categories and so on
|
|
llvm::Constant *CGObjCGNU::GenerateProtocolList(ArrayRef<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,
|
|
nullptr);
|
|
std::vector<llvm::Constant*> Elements;
|
|
for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
|
|
iter != endIter ; iter++) {
|
|
llvm::Constant *protocol = nullptr;
|
|
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, CGM.getPointerAlign(),
|
|
".objc_protocol_list");
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GenerateProtocolRef(CodeGenFunction &CGF,
|
|
const ObjCProtocolDecl *PD) {
|
|
llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()];
|
|
llvm::Type *T =
|
|
CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType());
|
|
return CGF.Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T));
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GenerateEmptyProtocol(
|
|
const std::string &ProtocolName) {
|
|
SmallVector<std::string, 0> EmptyStringVector;
|
|
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(),
|
|
nullptr);
|
|
// The isa pointer must be set to a magic number so the runtime knows it's
|
|
// the correct layout.
|
|
llvm::Constant *Elements[] = {
|
|
llvm::ConstantExpr::getIntToPtr(
|
|
llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy),
|
|
MakeConstantString(ProtocolName, ".objc_protocol_name"), ProtocolList,
|
|
MethodList, MethodList, MethodList, MethodList};
|
|
return MakeGlobal(ProtocolTy, Elements, CGM.getPointerAlign(),
|
|
".objc_protocol");
|
|
}
|
|
|
|
void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) {
|
|
ASTContext &Context = CGM.getContext();
|
|
std::string ProtocolName = PD->getNameAsString();
|
|
|
|
// Use the protocol definition, if there is one.
|
|
if (const ObjCProtocolDecl *Def = PD->getDefinition())
|
|
PD = Def;
|
|
|
|
SmallVector<std::string, 16> Protocols;
|
|
for (const auto *PI : PD->protocols())
|
|
Protocols.push_back(PI->getNameAsString());
|
|
SmallVector<llvm::Constant*, 16> InstanceMethodNames;
|
|
SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
|
|
SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames;
|
|
SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes;
|
|
for (const auto *I : PD->instance_methods()) {
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForMethodDecl(I, TypeStr);
|
|
if (I->getImplementationControl() == ObjCMethodDecl::Optional) {
|
|
OptionalInstanceMethodNames.push_back(
|
|
MakeConstantString(I->getSelector().getAsString()));
|
|
OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
} else {
|
|
InstanceMethodNames.push_back(
|
|
MakeConstantString(I->getSelector().getAsString()));
|
|
InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
}
|
|
}
|
|
// Collect information about class methods:
|
|
SmallVector<llvm::Constant*, 16> ClassMethodNames;
|
|
SmallVector<llvm::Constant*, 16> ClassMethodTypes;
|
|
SmallVector<llvm::Constant*, 16> OptionalClassMethodNames;
|
|
SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes;
|
|
for (const auto *I : PD->class_methods()) {
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForMethodDecl(I,TypeStr);
|
|
if (I->getImplementationControl() == ObjCMethodDecl::Optional) {
|
|
OptionalClassMethodNames.push_back(
|
|
MakeConstantString(I->getSelector().getAsString()));
|
|
OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
} else {
|
|
ClassMethodNames.push_back(
|
|
MakeConstantString(I->getSelector().getAsString()));
|
|
ClassMethodTypes.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, Int8Ty, Int8Ty, PtrToInt8Ty,
|
|
PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, nullptr);
|
|
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 (auto *property : PD->instance_properties()) {
|
|
std::vector<llvm::Constant*> Fields;
|
|
|
|
Fields.push_back(MakePropertyEncodingString(property, nullptr));
|
|
PushPropertyAttributes(Fields, property);
|
|
|
|
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(),
|
|
nullptr);
|
|
// The isa pointer must be set to a magic number so the runtime knows it's
|
|
// the correct layout.
|
|
llvm::Constant *Elements[] = {
|
|
llvm::ConstantExpr::getIntToPtr(
|
|
llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy),
|
|
MakeConstantString(ProtocolName, ".objc_protocol_name"), ProtocolList,
|
|
InstanceMethodList, ClassMethodList, OptionalInstanceMethodList,
|
|
OptionalClassMethodList, PropertyList, OptionalPropertyList};
|
|
ExistingProtocols[ProtocolName] =
|
|
llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements,
|
|
CGM.getPointerAlign(), ".objc_protocol"), IdTy);
|
|
}
|
|
void CGObjCGNU::GenerateProtocolHolderCategory() {
|
|
// Collect information about instance methods
|
|
SmallVector<Selector, 1> MethodSels;
|
|
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,
|
|
nullptr);
|
|
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, CGM.getPointerAlign(),
|
|
".objc_protocol_list"), PtrTy));
|
|
Categories.push_back(llvm::ConstantExpr::getBitCast(
|
|
MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
|
|
PtrTy, PtrTy, PtrTy, nullptr), Elements, CGM.getPointerAlign()),
|
|
PtrTy));
|
|
}
|
|
|
|
/// Libobjc2 uses a bitfield representation where small(ish) bitfields are
|
|
/// stored in a 64-bit value with the low bit set to 1 and the remaining 63
|
|
/// bits set to their values, LSB first, while larger ones are stored in a
|
|
/// structure of this / form:
|
|
///
|
|
/// struct { int32_t length; int32_t values[length]; };
|
|
///
|
|
/// The values in the array are stored in host-endian format, with the least
|
|
/// significant bit being assumed to come first in the bitfield. Therefore, a
|
|
/// bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, while a
|
|
/// bitfield / with the 63rd bit set will be 1<<64.
|
|
llvm::Constant *CGObjCGNU::MakeBitField(ArrayRef<bool> bits) {
|
|
int bitCount = bits.size();
|
|
int ptrBits = CGM.getDataLayout().getPointerSizeInBits();
|
|
if (bitCount < ptrBits) {
|
|
uint64_t val = 1;
|
|
for (int i=0 ; i<bitCount ; ++i) {
|
|
if (bits[i]) val |= 1ULL<<(i+1);
|
|
}
|
|
return llvm::ConstantInt::get(IntPtrTy, val);
|
|
}
|
|
SmallVector<llvm::Constant *, 8> values;
|
|
int v=0;
|
|
while (v < bitCount) {
|
|
int32_t word = 0;
|
|
for (int i=0 ; (i<32) && (v<bitCount) ; ++i) {
|
|
if (bits[v]) word |= 1<<i;
|
|
v++;
|
|
}
|
|
values.push_back(llvm::ConstantInt::get(Int32Ty, word));
|
|
}
|
|
llvm::ArrayType *arrayTy = llvm::ArrayType::get(Int32Ty, values.size());
|
|
llvm::Constant *array = llvm::ConstantArray::get(arrayTy, values);
|
|
llvm::Constant *fields[2] = {
|
|
llvm::ConstantInt::get(Int32Ty, values.size()),
|
|
array };
|
|
llvm::Constant *GS = MakeGlobal(llvm::StructType::get(Int32Ty, arrayTy,
|
|
nullptr), fields, CharUnits::fromQuantity(4));
|
|
llvm::Constant *ptr = llvm::ConstantExpr::getPtrToInt(GS, IntPtrTy);
|
|
return ptr;
|
|
}
|
|
|
|
void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
|
|
std::string ClassName = OCD->getClassInterface()->getNameAsString();
|
|
std::string CategoryName = OCD->getNameAsString();
|
|
// Collect information about instance methods
|
|
SmallVector<Selector, 16> InstanceMethodSels;
|
|
SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
|
|
for (const auto *I : OCD->instance_methods()) {
|
|
InstanceMethodSels.push_back(I->getSelector());
|
|
std::string TypeStr;
|
|
CGM.getContext().getObjCEncodingForMethodDecl(I,TypeStr);
|
|
InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
}
|
|
|
|
// Collect information about class methods
|
|
SmallVector<Selector, 16> ClassMethodSels;
|
|
SmallVector<llvm::Constant*, 16> ClassMethodTypes;
|
|
for (const auto *I : OCD->class_methods()) {
|
|
ClassMethodSels.push_back(I->getSelector());
|
|
std::string TypeStr;
|
|
CGM.getContext().getObjCEncodingForMethodDecl(I,TypeStr);
|
|
ClassMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
}
|
|
|
|
// Collect the names of referenced protocols
|
|
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());
|
|
|
|
llvm::Constant *Elements[] = {
|
|
MakeConstantString(CategoryName), MakeConstantString(ClassName),
|
|
// Instance method list
|
|
llvm::ConstantExpr::getBitCast(
|
|
GenerateMethodList(ClassName, CategoryName, InstanceMethodSels,
|
|
InstanceMethodTypes, false),
|
|
PtrTy),
|
|
// Class method list
|
|
llvm::ConstantExpr::getBitCast(GenerateMethodList(ClassName, CategoryName,
|
|
ClassMethodSels,
|
|
ClassMethodTypes, true),
|
|
PtrTy),
|
|
// Protocol list
|
|
llvm::ConstantExpr::getBitCast(GenerateProtocolList(Protocols), PtrTy)};
|
|
Categories.push_back(llvm::ConstantExpr::getBitCast(
|
|
MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty,
|
|
PtrTy, PtrTy, PtrTy, nullptr), Elements, CGM.getPointerAlign()),
|
|
PtrTy));
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID,
|
|
SmallVectorImpl<Selector> &InstanceMethodSels,
|
|
SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) {
|
|
ASTContext &Context = CGM.getContext();
|
|
// Property metadata: name, attributes, attributes2, padding1, padding2,
|
|
// setter name, setter types, getter name, getter types.
|
|
llvm::StructType *PropertyMetadataTy = llvm::StructType::get(
|
|
PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty,
|
|
PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, nullptr);
|
|
std::vector<llvm::Constant*> Properties;
|
|
|
|
// Add all of the property methods need adding to the method list and to the
|
|
// property metadata list.
|
|
for (auto *propertyImpl : OID->property_impls()) {
|
|
std::vector<llvm::Constant*> Fields;
|
|
ObjCPropertyDecl *property = propertyImpl->getPropertyDecl();
|
|
bool isSynthesized = (propertyImpl->getPropertyImplementation() ==
|
|
ObjCPropertyImplDecl::Synthesize);
|
|
bool isDynamic = (propertyImpl->getPropertyImplementation() ==
|
|
ObjCPropertyImplDecl::Dynamic);
|
|
|
|
Fields.push_back(MakePropertyEncodingString(property, OID));
|
|
PushPropertyAttributes(Fields, property, isSynthesized, isDynamic);
|
|
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::RegisterAlias(const ObjCCompatibleAliasDecl *OAD) {
|
|
// Get the class declaration for which the alias is specified.
|
|
ObjCInterfaceDecl *ClassDecl =
|
|
const_cast<ObjCInterfaceDecl *>(OAD->getClassInterface());
|
|
ClassAliases.emplace_back(ClassDecl->getNameAsString(),
|
|
OAD->getNameAsString());
|
|
}
|
|
|
|
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.
|
|
SmallVector<llvm::Constant*, 16> IvarNames;
|
|
SmallVector<llvm::Constant*, 16> IvarTypes;
|
|
SmallVector<llvm::Constant*, 16> IvarOffsets;
|
|
|
|
std::vector<llvm::Constant*> IvarOffsetValues;
|
|
SmallVector<bool, 16> WeakIvars;
|
|
SmallVector<bool, 16> StrongIvars;
|
|
|
|
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.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
instanceSize = 0 - (instanceSize - superInstanceSize);
|
|
}
|
|
|
|
for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
|
|
IVD = IVD->getNextIvar()) {
|
|
// 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.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
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);
|
|
Qualifiers::ObjCLifetime lt = IVD->getType().getQualifiers().getObjCLifetime();
|
|
switch (lt) {
|
|
case Qualifiers::OCL_Strong:
|
|
StrongIvars.push_back(true);
|
|
WeakIvars.push_back(false);
|
|
break;
|
|
case Qualifiers::OCL_Weak:
|
|
StrongIvars.push_back(false);
|
|
WeakIvars.push_back(true);
|
|
break;
|
|
default:
|
|
StrongIvars.push_back(false);
|
|
WeakIvars.push_back(false);
|
|
}
|
|
}
|
|
llvm::Constant *StrongIvarBitmap = MakeBitField(StrongIvars);
|
|
llvm::Constant *WeakIvarBitmap = MakeBitField(WeakIvars);
|
|
llvm::GlobalVariable *IvarOffsetArray =
|
|
MakeGlobalArray(PtrToIntTy, IvarOffsetValues, CGM.getPointerAlign(),
|
|
".ivar.offsets");
|
|
|
|
// Collect information about instance methods
|
|
SmallVector<Selector, 16> InstanceMethodSels;
|
|
SmallVector<llvm::Constant*, 16> InstanceMethodTypes;
|
|
for (const auto *I : OID->instance_methods()) {
|
|
InstanceMethodSels.push_back(I->getSelector());
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForMethodDecl(I,TypeStr);
|
|
InstanceMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
}
|
|
|
|
llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels,
|
|
InstanceMethodTypes);
|
|
|
|
// Collect information about class methods
|
|
SmallVector<Selector, 16> ClassMethodSels;
|
|
SmallVector<llvm::Constant*, 16> ClassMethodTypes;
|
|
for (const auto *I : OID->class_methods()) {
|
|
ClassMethodSels.push_back(I->getSelector());
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForMethodDecl(I,TypeStr);
|
|
ClassMethodTypes.push_back(MakeConstantString(TypeStr));
|
|
}
|
|
// Collect the names of referenced protocols
|
|
SmallVector<std::string, 16> Protocols;
|
|
for (const auto *I : ClassDecl->protocols())
|
|
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
|
|
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)
|
|
llvm::Type *IndexTy = Int32Ty;
|
|
llvm::Constant *offsetPointerIndexes[] = {Zeros[0],
|
|
llvm::ConstantInt::get(IndexTy, 1), nullptr,
|
|
llvm::ConstantInt::get(IndexTy, 2) };
|
|
|
|
unsigned ivarIndex = 0;
|
|
for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
|
|
IVD = IVD->getNextIvar()) {
|
|
const std::string Name = "__objc_ivar_offset_" + ClassName + '.'
|
|
+ IVD->getNameAsString();
|
|
offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, ivarIndex);
|
|
// Get the correct ivar field
|
|
llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr(
|
|
cast<llvm::GlobalVariable>(IvarList)->getValueType(), IvarList,
|
|
offsetPointerIndexes);
|
|
// 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);
|
|
(void) offset; // Silence dead store warning.
|
|
}
|
|
++ivarIndex;
|
|
}
|
|
llvm::Constant *ZeroPtr = llvm::ConstantInt::get(IntPtrTy, 0);
|
|
//Generate metaclass for class methods
|
|
llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr,
|
|
NULLPtr, 0x12L, ClassName.c_str(), nullptr, Zeros[0], GenerateIvarList(
|
|
empty, empty, empty), ClassMethodList, NULLPtr,
|
|
NULLPtr, NULLPtr, ZeroPtr, ZeroPtr, true);
|
|
|
|
// Generate the class structure
|
|
llvm::Constant *ClassStruct =
|
|
GenerateClassStructure(MetaClassStruct, SuperClass, 0x11L,
|
|
ClassName.c_str(), nullptr,
|
|
llvm::ConstantInt::get(LongTy, instanceSize), IvarList,
|
|
MethodList, GenerateProtocolList(Protocols), IvarOffsetArray,
|
|
Properties, StrongIvarBitmap, WeakIvarBitmap);
|
|
|
|
// Resolve the class aliases, if they exist.
|
|
if (ClassPtrAlias) {
|
|
ClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(ClassStruct, IdTy));
|
|
ClassPtrAlias->eraseFromParent();
|
|
ClassPtrAlias = nullptr;
|
|
}
|
|
if (MetaClassPtrAlias) {
|
|
MetaClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy));
|
|
MetaClassPtrAlias->eraseFromParent();
|
|
MetaClassPtrAlias = nullptr;
|
|
}
|
|
|
|
// 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 nullptr;
|
|
|
|
// Add all referenced protocols to a category.
|
|
GenerateProtocolHolderCategory();
|
|
|
|
llvm::StructType *SelStructTy = dyn_cast<llvm::StructType>(
|
|
SelectorTy->getElementType());
|
|
llvm::Type *SelStructPtrTy = SelectorTy;
|
|
if (!SelStructTy) {
|
|
SelStructTy = llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, nullptr);
|
|
SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy);
|
|
}
|
|
|
|
std::vector<llvm::Constant*> Elements;
|
|
llvm::Constant *Statics = NULLPtr;
|
|
// Generate statics list:
|
|
if (!ConstantStrings.empty()) {
|
|
llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
|
|
ConstantStrings.size() + 1);
|
|
ConstantStrings.push_back(NULLPtr);
|
|
|
|
StringRef StringClass = CGM.getLangOpts().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, nullptr);
|
|
llvm::Type *StaticsListPtrTy =
|
|
llvm::PointerType::getUnqual(StaticsListTy);
|
|
Statics = MakeGlobal(StaticsListTy, Elements, CGM.getPointerAlign(),
|
|
".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,
|
|
CGM.getPointerAlign(), ".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, nullptr);
|
|
|
|
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");
|
|
|
|
SmallVectorImpl<TypedSelector> &Types = iter->second;
|
|
for (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::GlobalVariable *SelectorList =
|
|
MakeGlobalArray(SelStructTy, Selectors, CGM.getPointerAlign(),
|
|
".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(Int32Ty, i), Zeros[0]};
|
|
// FIXME: We're generating redundant loads and stores here!
|
|
llvm::Constant *SelPtr = llvm::ConstantExpr::getGetElementPtr(
|
|
SelectorList->getValueType(), SelectorList, makeArrayRef(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, CGM.getPointerAlign());
|
|
|
|
// 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 : nullptr, nullptr);
|
|
Elements.clear();
|
|
// Runtime version, used for ABI compatibility checking.
|
|
Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion));
|
|
// sizeof(ModuleTy)
|
|
llvm::DataLayout 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.getLangOpts().getGC()) {
|
|
case LangOptions::GCOnly:
|
|
Elements.push_back(llvm::ConstantInt::get(IntTy, 2));
|
|
break;
|
|
case LangOptions::NonGC:
|
|
if (CGM.getLangOpts().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, CGM.getPointerAlign());
|
|
|
|
// 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(CGM, VMContext);
|
|
Builder.SetInsertPoint(EntryBB);
|
|
|
|
llvm::FunctionType *FT =
|
|
llvm::FunctionType::get(Builder.getVoidTy(),
|
|
llvm::PointerType::getUnqual(ModuleTy), true);
|
|
llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__objc_exec_class");
|
|
Builder.CreateCall(Register, Module);
|
|
|
|
if (!ClassAliases.empty()) {
|
|
llvm::Type *ArgTypes[2] = {PtrTy, PtrToInt8Ty};
|
|
llvm::FunctionType *RegisterAliasTy =
|
|
llvm::FunctionType::get(Builder.getVoidTy(),
|
|
ArgTypes, false);
|
|
llvm::Function *RegisterAlias = llvm::Function::Create(
|
|
RegisterAliasTy,
|
|
llvm::GlobalValue::ExternalWeakLinkage, "class_registerAlias_np",
|
|
&TheModule);
|
|
llvm::BasicBlock *AliasBB =
|
|
llvm::BasicBlock::Create(VMContext, "alias", LoadFunction);
|
|
llvm::BasicBlock *NoAliasBB =
|
|
llvm::BasicBlock::Create(VMContext, "no_alias", LoadFunction);
|
|
|
|
// Branch based on whether the runtime provided class_registerAlias_np()
|
|
llvm::Value *HasRegisterAlias = Builder.CreateICmpNE(RegisterAlias,
|
|
llvm::Constant::getNullValue(RegisterAlias->getType()));
|
|
Builder.CreateCondBr(HasRegisterAlias, AliasBB, NoAliasBB);
|
|
|
|
// The true branch (has alias registration function):
|
|
Builder.SetInsertPoint(AliasBB);
|
|
// Emit alias registration calls:
|
|
for (std::vector<ClassAliasPair>::iterator iter = ClassAliases.begin();
|
|
iter != ClassAliases.end(); ++iter) {
|
|
llvm::Constant *TheClass =
|
|
TheModule.getGlobalVariable(("_OBJC_CLASS_" + iter->first).c_str(),
|
|
true);
|
|
if (TheClass) {
|
|
TheClass = llvm::ConstantExpr::getBitCast(TheClass, PtrTy);
|
|
Builder.CreateCall(RegisterAlias,
|
|
{TheClass, MakeConstantString(iter->second)});
|
|
}
|
|
}
|
|
// Jump to end:
|
|
Builder.CreateBr(NoAliasBB);
|
|
|
|
// Missing alias registration function, just return from the function:
|
|
Builder.SetInsertPoint(NoAliasBB);
|
|
}
|
|
Builder.CreateRetVoid();
|
|
|
|
return LoadFunction;
|
|
}
|
|
|
|
llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) {
|
|
const ObjCCategoryImplDecl *OCD =
|
|
dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext());
|
|
StringRef CategoryName = OCD ? OCD->getName() : "";
|
|
StringRef ClassName = CD->getName();
|
|
Selector MethodName = OMD->getSelector();
|
|
bool isClassMethod = !OMD->isInstanceMethod();
|
|
|
|
CodeGenTypes &Types = CGM.getTypes();
|
|
llvm::FunctionType *MethodTy =
|
|
Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD));
|
|
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::GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) {
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GetGetStructFunction() {
|
|
return GetStructPropertyFn;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GetSetStructFunction() {
|
|
return SetStructPropertyFn;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GetCppAtomicObjectGetFunction() {
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GetCppAtomicObjectSetFunction() {
|
|
return nullptr;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
|
|
const ObjCAtThrowStmt &S,
|
|
bool ClearInsertionPoint) {
|
|
llvm::Value *ExceptionAsObject;
|
|
|
|
if (const Expr *ThrowExpr = S.getThrowExpr()) {
|
|
llvm::Value *Exception = CGF.EmitObjCThrowOperand(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);
|
|
llvm::CallSite Throw =
|
|
CGF.EmitRuntimeCallOrInvoke(ExceptionThrowFn, ExceptionAsObject);
|
|
Throw.setDoesNotReturn();
|
|
CGF.Builder.CreateUnreachable();
|
|
if (ClearInsertionPoint)
|
|
CGF.Builder.ClearInsertionPoint();
|
|
}
|
|
|
|
llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF,
|
|
Address AddrWeakObj) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy);
|
|
return B.CreateCall(WeakReadFn.getType(), WeakReadFn,
|
|
AddrWeakObj.getPointer());
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
B.CreateCall(WeakAssignFn.getType(), WeakAssignFn,
|
|
{src, dst.getPointer()});
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst,
|
|
bool threadlocal) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
// FIXME. Add threadloca assign API
|
|
assert(!threadlocal && "EmitObjCGlobalAssign - Threal Local API NYI");
|
|
B.CreateCall(GlobalAssignFn.getType(), GlobalAssignFn,
|
|
{src, dst.getPointer()});
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst,
|
|
llvm::Value *ivarOffset) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, IdTy);
|
|
B.CreateCall(IvarAssignFn.getType(), IvarAssignFn,
|
|
{src, dst.getPointer(), ivarOffset});
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
B.CreateCall(StrongCastAssignFn.getType(), StrongCastAssignFn,
|
|
{src, dst.getPointer()});
|
|
}
|
|
|
|
void CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF,
|
|
Address DestPtr,
|
|
Address SrcPtr,
|
|
llvm::Value *Size) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
DestPtr = EnforceType(B, DestPtr, PtrTy);
|
|
SrcPtr = EnforceType(B, SrcPtr, PtrTy);
|
|
|
|
B.CreateCall(MemMoveFn.getType(), MemMoveFn,
|
|
{DestPtr.getPointer(), SrcPtr.getPointer(), 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(Int32Ty, Offset,
|
|
/*isSigned*/true);
|
|
// 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.getLangOpts().PICLevel) {
|
|
llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule,
|
|
Int32Ty, 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, nullptr, 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) {
|
|
for (const ObjCIvarDecl *next = OID->all_declared_ivar_begin(); next;
|
|
next = next->getNextIvar()) {
|
|
if (OIVD == next)
|
|
return OID;
|
|
}
|
|
|
|
// Otherwise check in the super class.
|
|
if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
|
|
return FindIvarInterface(Context, Super, OIVD);
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) {
|
|
if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar);
|
|
if (RuntimeVersion < 10)
|
|
return CGF.Builder.CreateZExtOrBitCast(
|
|
CGF.Builder.CreateDefaultAlignedLoad(CGF.Builder.CreateAlignedLoad(
|
|
ObjCIvarOffsetVariable(Interface, Ivar),
|
|
CGF.getPointerAlign(), "ivar")),
|
|
PtrDiffTy);
|
|
std::string name = "__objc_ivar_offset_value_" +
|
|
Interface->getNameAsString() +"." + Ivar->getNameAsString();
|
|
CharUnits Align = CGM.getIntAlign();
|
|
llvm::Value *Offset = TheModule.getGlobalVariable(name);
|
|
if (!Offset) {
|
|
auto GV = new llvm::GlobalVariable(TheModule, IntTy,
|
|
false, llvm::GlobalValue::LinkOnceAnyLinkage,
|
|
llvm::Constant::getNullValue(IntTy), name);
|
|
GV->setAlignment(Align.getQuantity());
|
|
Offset = GV;
|
|
}
|
|
Offset = CGF.Builder.CreateAlignedLoad(Offset, Align);
|
|
if (Offset->getType() != PtrDiffTy)
|
|
Offset = CGF.Builder.CreateZExtOrBitCast(Offset, PtrDiffTy);
|
|
return Offset;
|
|
}
|
|
uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar);
|
|
return llvm::ConstantInt::get(PtrDiffTy, Offset, /*isSigned*/true);
|
|
}
|
|
|
|
CGObjCRuntime *
|
|
clang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) {
|
|
switch (CGM.getLangOpts().ObjCRuntime.getKind()) {
|
|
case ObjCRuntime::GNUstep:
|
|
return new CGObjCGNUstep(CGM);
|
|
|
|
case ObjCRuntime::GCC:
|
|
return new CGObjCGCC(CGM);
|
|
|
|
case ObjCRuntime::ObjFW:
|
|
return new CGObjCObjFW(CGM);
|
|
|
|
case ObjCRuntime::FragileMacOSX:
|
|
case ObjCRuntime::MacOSX:
|
|
case ObjCRuntime::iOS:
|
|
case ObjCRuntime::WatchOS:
|
|
llvm_unreachable("these runtimes are not GNU runtimes");
|
|
}
|
|
llvm_unreachable("bad runtime");
|
|
}
|