lib/Target/MachineFrameInfo.cpp

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