1
//===----- TargetFrameLoweringImpl.cpp - Implement target frame interface --==//
3
// The LLVM Compiler Infrastructure
5
// This file is distributed under the University of Illinois Open Source
6
// License. See LICENSE.TXT for details.
8
//===----------------------------------------------------------------------===//
10
// Implements the layout of a stack frame on the target machine.
12
//===----------------------------------------------------------------------===//
14
#include "llvm/CodeGen/MachineFrameInfo.h"
15
#include "llvm/CodeGen/MachineFunction.h"
16
#include "llvm/Target/TargetFrameLowering.h"
17
#include "llvm/Target/TargetMachine.h"
18
#include "llvm/Target/TargetRegisterInfo.h"
23
TargetFrameLowering::~TargetFrameLowering() {
26
/// getFrameIndexOffset - Returns the displacement from the frame register to
27
/// the stack frame of the specified index. This is the default implementation
28
/// which is overridden for some targets.
29
int TargetFrameLowering::getFrameIndexOffset(const MachineFunction &MF,
31
const MachineFrameInfo *MFI = MF.getFrameInfo();
32
return MFI->getObjectOffset(FI) + MFI->getStackSize() -
33
getOffsetOfLocalArea() + MFI->getOffsetAdjustment();
36
int TargetFrameLowering::getFrameIndexReference(const MachineFunction &MF,
37
int FI, unsigned &FrameReg) const {
38
const TargetRegisterInfo *RI = MF.getTarget().getRegisterInfo();
40
// By default, assume all frame indices are referenced via whatever
41
// getFrameRegister() says. The target can override this if it's doing
42
// something different.
43
FrameReg = RI->getFrameRegister(MF);
44
return getFrameIndexOffset(MF, FI);