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llvm/lib/Target/MachineFrameInfo.cpp
2002-10-28 00:28:31 +00:00

43 lines
1.5 KiB
C++

//===-- MachineFrameInfo.cpp-----------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
#include "llvm/Target/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
int
MachineFrameInfo::getIncomingArgOffset(MachineFunction& 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(MachineFunction& 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;
}