path: root/lib/CodeGen/CGCall.cpp

//===----- CGCall.h - Encapsulate calling convention details ----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// These classes wrap the information about a call or function
// definition used to handle ABI compliancy.
//
//===----------------------------------------------------------------------===//

#include "CGCall.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/CodeGen/CodeGenOptions.h"
#include "llvm/Attributes.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Target/TargetData.h"

#include "ABIInfo.h"

using namespace clang;
using namespace CodeGen;

/***/

// FIXME: Use iterator and sidestep silly type array creation.

const
CGFunctionInfo &CodeGenTypes::getFunctionInfo(const FunctionNoProtoType *FTNP) {
  // FIXME: Set calling convention correctly, it needs to be associated with the
  // type somehow.
  return getFunctionInfo(FTNP->getResultType(),
                         llvm::SmallVector<QualType, 16>(), 0);
}

const
CGFunctionInfo &CodeGenTypes::getFunctionInfo(const FunctionProtoType *FTP) {
  llvm::SmallVector<QualType, 16> ArgTys;
  // FIXME: Kill copy.
  for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
    ArgTys.push_back(FTP->getArgType(i));
  // FIXME: Set calling convention correctly, it needs to be associated with the
  // type somehow.
  return getFunctionInfo(FTP->getResultType(), ArgTys, 0);
}

static unsigned getCallingConventionForDecl(const Decl *D) {
  // Set the appropriate calling convention for the Function.
  if (D->hasAttr<StdCallAttr>())
    return llvm::CallingConv::X86_StdCall;

  if (D->hasAttr<FastCallAttr>())
    return llvm::CallingConv::X86_FastCall;

  return llvm::CallingConv::C;
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(const CXXRecordDecl *RD,
                                                 const FunctionProtoType *FTP) {
  llvm::SmallVector<QualType, 16> ArgTys;
  
  // Add the 'this' pointer.
  ArgTys.push_back(Context.getPointerType(Context.getTagDeclType(RD)));
  
  for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
    ArgTys.push_back(FTP->getArgType(i));
  
  // FIXME: Set calling convention correctly, it needs to be associated with the
  // type somehow.
  return getFunctionInfo(FTP->getResultType(), ArgTys, 0);
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(const CXXMethodDecl *MD) {
  llvm::SmallVector<QualType, 16> ArgTys;
  // Add the 'this' pointer unless this is a static method.
  if (MD->isInstance())
    ArgTys.push_back(MD->getThisType(Context));

  const FunctionProtoType *FTP = MD->getType()->getAs<FunctionProtoType>();
  for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
    ArgTys.push_back(FTP->getArgType(i));
  return getFunctionInfo(FTP->getResultType(), ArgTys,
                         getCallingConventionForDecl(MD));
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(const CXXConstructorDecl *D, 
                                                    CXXCtorType Type) {
  llvm::SmallVector<QualType, 16> ArgTys;

  // Add the 'this' pointer.
  ArgTys.push_back(D->getThisType(Context));

  // Check if we need to add a VTT parameter (which has type void **).
  if (Type == Ctor_Base && D->getParent()->getNumVBases() != 0)
    ArgTys.push_back(Context.getPointerType(Context.VoidPtrTy));
  
  const FunctionProtoType *FTP = D->getType()->getAs<FunctionProtoType>();
  for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
    ArgTys.push_back(FTP->getArgType(i));
  return getFunctionInfo(FTP->getResultType(), ArgTys,
                         getCallingConventionForDecl(D));
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(const CXXDestructorDecl *D,
                                                    CXXDtorType Type) {
  llvm::SmallVector<QualType, 16> ArgTys;
  
  // Add the 'this' pointer.
  ArgTys.push_back(D->getThisType(Context));
  
  // Check if we need to add a VTT parameter (which has type void **).
  if (Type == Dtor_Base && D->getParent()->getNumVBases() != 0)
    ArgTys.push_back(Context.getPointerType(Context.VoidPtrTy));
  
  const FunctionProtoType *FTP