llvm-mirror/lib/Target/MachineFrameInfo.cpp

// $Id$ -*-c++-*-
//***************************************************************************
// File:
//	MachineFrameInfo.cpp
// 
// Purpose:
//	Interface to layout of stack frame on target machine.
//      Most functions of class MachineFrameInfo have to be machine-specific
//      so there is little code here.
// 
// History:
//	 4/17/02	 -  Vikram Adve  -  Created
//**************************************************************************/


#include "llvm/Target/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineCodeForMethod.h"


int
MachineFrameInfo::getIncomingArgOffset(MachineCodeForMethod& mcInfo,
                                       unsigned argNum) const
{
  assert(argsOnStackHaveFixedSize()); 
  
  unsigned relativeOffset = argNum * getSizeOfEachArgOnStack();
  bool growUp;                          // do args grow up or down
  int firstArg = getFirstIncomingArgOffset(mcInfo, growUp);
  int offset = growUp? firstArg + relativeOffset 
                     : firstArg - relativeOffset; 
  return offset; 
}


int
MachineFrameInfo::getOutgoingArgOffset(MachineCodeForMethod& mcInfo,
                                       unsigned argNum) const
{
  assert(argsOnStackHaveFixedSize()); 
  assert(((int) argNum - this->getNumFixedOutgoingArgs())
         <= (int) mcInfo.getMaxOptionalNumArgs());
  
  unsigned relativeOffset = argNum * getSizeOfEachArgOnStack();
  bool growUp;                          // do args grow up or down
  int firstArg = getFirstOutgoingArgOffset(mcInfo, growUp);
  int offset = growUp? firstArg + relativeOffset 
                     : firstArg - relativeOffset; 
  
  return offset; 
}