lib/Target/MachineFrameInfo.cpp

   1 // $Id$ -*-c++-*-
   2 //***************************************************************************
   3 // File:
   4 //      MachineFrameInfo.cpp
   5 //
   6 // Purpose:
   7 //      Interface to layout of stack frame on target machine.
   8 //      Most functions of class MachineFrameInfo have to be machine-specific
   9 //      so there is little code here.
  10 //
  11 // History:
  12 //       4/17/02         -  Vikram Adve  -  Created
  13 //**************************************************************************/
  14
  15
  16 #include "llvm/Target/MachineFrameInfo.h"
  17 #include "llvm/CodeGen/MachineCodeForMethod.h"
  18
  19
  20 int
  21 MachineFrameInfo::getIncomingArgOffset(MachineCodeForMethod& mcInfo,
  22                                        unsigned argNum) const
  23 {
  24   assert(argsOnStackHaveFixedSize());
  25
  26   unsigned relativeOffset = argNum * getSizeOfEachArgOnStack();
  27   bool growUp;                          // do args grow up or down
  28   int firstArg = getFirstIncomingArgOffset(mcInfo, growUp);
  29   int offset = growUp? firstArg + relativeOffset
  30                      : firstArg - relativeOffset;
  31   return offset;
  32 }
  33
  34
  35 int
  36 MachineFrameInfo::getOutgoingArgOffset(MachineCodeForMethod& mcInfo,
  37                                        unsigned argNum) const
  38 {
  39   assert(argsOnStackHaveFixedSize());
  40   assert(((int) argNum - this->getNumFixedOutgoingArgs())
  41          <= (int) mcInfo.getMaxOptionalNumArgs());
  42
  43   unsigned relativeOffset = argNum * getSizeOfEachArgOnStack();
  44   bool growUp;                          // do args grow up or down
  45   int firstArg = getFirstOutgoingArgOffset(mcInfo, growUp);
  46   int offset = growUp? firstArg + relativeOffset
  47                      : firstArg - relativeOffset;
  48
  49   return offset;
  50 }