1 //===----- TargetFrameLowering.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> 21 using namespace llvm; 22 23 TargetFrameLowering::~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. 29 int 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 36 int 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
