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/Frontend/CompileOptions.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 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()->getAsFunctionProtoType();
  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 FunctionDecl *FD) {
  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
    if (MD->isInstance())
      return getFunctionInfo(MD);

  unsigned CallingConvention = getCallingConventionForDecl(FD);
  const FunctionType *FTy = FD->getType()->getAsFunctionType();
  if (const FunctionNoProtoType *FNTP = dyn_cast<FunctionNoProtoType>(FTy))
    return getFunctionInfo(FNTP->getResultType(), 
                           llvm::SmallVector<QualType, 16>(),
                           CallingConvention);
  
  const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
  llvm::SmallVector<QualType, 16> ArgTys;
  // FIXME: Kill copy.
  for (unsigned i = 0, e = FPT->getNumArgs(); i != e; ++i)
    ArgTys.push_back(FPT->getArgType(i));
  return getFunctionInfo(FPT->getResultType(), ArgTys, CallingConvention);
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(const ObjCMethodDecl *MD) {
  llvm::SmallVector<QualType, 16> ArgTys;
  ArgTys.push_back(MD->getSelfDecl()->getType());
  ArgTys.push_back(Context.getObjCSelType());
  // FIXME: Kill copy?
  for (ObjCMethodDecl::param_iterator i = MD->param_begin(),
         e = MD->param_end(); i != e; ++i)
    ArgTys.push_back((*i)->getType());
  return getFunctionInfo(MD->getResultType(), ArgTys,
                         getCallingConventionForDecl(MD));
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(QualType ResTy,
                                                    const CallArgList &Args,
                                                    unsigned CallingConvention){
  // FIXME: Kill copy.
  llvm::SmallVector<QualType, 16> ArgTys;
  for (CallArgList::const_iterator i = Args.begin(), e = Args.end();
       i != e; ++i)
    ArgTys.push_back(i->second);
  return getFunctionInfo(ResTy, ArgTys, CallingConvention);
}

const CGFunctionInfo &CodeGenTypes::getFunctionInfo(QualType ResTy,
                                                    const FunctionArgList &Args,
                                                    unsigned CallingConvention){
  // FIXME: Kill copy.
  llvm::SmallVector<QualType, 16> ArgTys;
  for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end