path: root/lib/CodeGen/ItaniumCXXABI.cpp

//===------- ItaniumCXXABI.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 C++ code generation targeting the Itanium C++ ABI.  The class
// in this file generates structures that follow the Itanium C++ ABI, which is
// documented at:
//  http://www.codesourcery.com/public/cxx-abi/abi.html
//  http://www.codesourcery.com/public/cxx-abi/abi-eh.html
//
// It also supports the closely-related ARM ABI, documented at:
// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0041c/IHI0041C_cppabi.pdf
//
//===----------------------------------------------------------------------===//

#include "CGCXXABI.h"
#include "CGRecordLayout.h"
#include "CGVTables.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/Type.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Value.h"

using namespace clang;
using namespace CodeGen;

namespace {
class ItaniumCXXABI : public CodeGen::CGCXXABI {
private:
  llvm::IntegerType *PtrDiffTy;
protected:
  bool UseARMMethodPtrABI;
  bool UseARMGuardVarABI;
  // It's a little silly for us to cache this.
  llvm::IntegerType *getPtrDiffTy() {
    if (!PtrDiffTy) {
      QualType T = getContext().getPointerDiffType();
      llvm::Type *Ty = CGM.getTypes().ConvertType(T);
      PtrDiffTy = cast<llvm::IntegerType>(Ty);
    }
    return PtrDiffTy;
  }

public:
  ItaniumCXXABI(CodeGen::CodeGenModule &CGM,
                bool UseARMMethodPtrABI = false,
                bool UseARMGuardVarABI = false) :
    CGCXXABI(CGM), PtrDiffTy(