path: root/lib/CodeGen/CGObjCGNU.cpp

//===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides Objective-C code generation targetting the GNU runtime.  The
// class in this file generates structures used by the GNU Objective-C runtime
// library.  These structures are defined in objc/objc.h and objc/objc-api.h in
// the GNU runtime distribution.
//
//===----------------------------------------------------------------------===//

#include "CGObjCRuntime.h"
#include "CodeGenModule.h"
#include "CodeGenFunction.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "llvm/Module.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Target/TargetData.h"
#include <map>


using namespace clang;
using namespace CodeGen;
using llvm::dyn_cast;

// The version of the runtime that this class targets.  Must match the version
// in the runtime.
static const int RuntimeVersion = 8;
static const int ProtocolVersion = 2;

namespace {
class CGObjCGNU : public CodeGen::CGObjCRuntime {
private:
  CodeGen::CodeGenModule &CGM;
  llvm::Module &TheModule;
  const llvm::PointerType *SelectorTy;
  const llvm::PointerType *PtrToInt8Ty;
  const llvm::FunctionType *IMPTy;
  const llvm::PointerType *IdTy;
  const llvm::IntegerType *IntTy;
  const llvm::PointerType *PtrTy;
  const llvm::IntegerType *LongTy;
  const llvm::PointerType *PtrToIntTy;
  std::vector<llvm::Constant*> Classes;
  std::vector<llvm::Constant*> Categories;
  std::vector<llvm::Constant*> ConstantStrings;
  llvm::Function *LoadFunction;
  llvm::StringMap<llvm::Constant*> ExistingProtocols;
  typedef std::pair<std::string, std::string> TypedSelector;
  std::map<TypedSelector, llvm::GlobalAlias*> TypedSelectors;
  llvm::StringMap<llvm::GlobalAlias*> UntypedSelectors;
  // Some zeros used for GEPs in lots of places.
  llvm::Constant *Zeros[2];
  llvm::Constant *NULLPtr;
private:
  llvm::Constant *GenerateIvarList(
      const llvm::SmallVectorImpl<llvm::Constant *>  &IvarNames,
      const llvm::SmallVectorImpl<llvm::Constant *>  &IvarTypes,
      const llvm::SmallVectorImpl<llvm::Constant *>  &IvarOffsets);
  llvm::Constant *GenerateMethodList(const std::string &ClassName,
      const std::string &CategoryName,
      const llvm::SmallVectorImpl<Selector>  &MethodSels, 
      const llvm::SmallVectorImpl<llvm::Constant *>  &MethodTypes, 
      bool isClassMethodList);
  llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName);
  llvm::Constant *GenerateProtocolList(
      const llvm::SmallVectorImpl<std::string> &Protocols);
  llvm::Constant *GenerateClassStructure(
      llvm::Constant *MetaClass,
      llvm::Constant *SuperClass,
      unsigned info,
      const char *Name,
      llvm::Constant *Version,
      llvm::Constant *InstanceSize,
      llvm::Constant *IVars,
      llvm::Constant *Methods,
      llvm::Constant *Protocols);
  llvm::Constant *GenerateProtocolMethodList(
      const llvm::SmallVectorImpl<llvm::Constant *>  &MethodNames,
      const llvm::SmallVectorImpl<llvm::Constant *>  &MethodTypes);
  llvm::Constant *MakeConstantString(const std::string &Str, const std::string
      &Name="");
  llvm::Constant *MakeGlobal(const llvm