1//===----- TargetFrameLoweringImpl.cpp - Implement target frame interface --==// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Implements the layout of a stack frame on the target machine. 11// 12//===----------------------------------------------------------------------===// 13 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" 19 20#include <cstdlib> 21using namespace llvm; 22 23TargetFrameLowering::~TargetFrameLowering() { 24} 25 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. 29int TargetFrameLowering::getFrameIndexOffset(const MachineFunction &MF, 30 int FI) const { 31 const MachineFrameInfo *MFI = MF.getFrameInfo(); 32 return MFI->getObjectOffset(FI) + MFI->getStackSize() - 33 getOffsetOfLocalArea() + MFI->getOffsetAdjustment(); 34} 35 36int TargetFrameLowering::getFrameIndexReference(const MachineFunction &MF, 37 int FI, unsigned &FrameReg) const { 38 const TargetRegisterInfo *RI = MF.getTarget().getRegisterInfo(); 39 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); 45} 46