1//===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==// 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// This class implements X86-specific bits of TargetFrameLowering class. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef X86_FRAMELOWERING_H 15#define X86_FRAMELOWERING_H 16 17#include "X86Subtarget.h" 18#include "llvm/MC/MCDwarf.h" 19#include "llvm/Target/TargetFrameLowering.h" 20 21namespace llvm { 22 23class MCSymbol; 24class X86TargetMachine; 25 26class X86FrameLowering : public TargetFrameLowering { 27 const X86TargetMachine &TM; 28 const X86Subtarget &STI; 29public: 30 explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti) 31 : TargetFrameLowering(StackGrowsDown, 32 sti.getStackAlignment(), 33 (sti.is64Bit() ? -8 : -4)), 34 TM(tm), STI(sti) { 35 } 36 37 void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label, 38 unsigned FramePtr) const; 39 40 /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 41 /// the function. 42 void emitPrologue(MachineFunction &MF) const; 43 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const; 44 45 void adjustForSegmentedStacks(MachineFunction &MF) const; 46 47 void adjustForHiPEPrologue(MachineFunction &MF) const; 48 49 void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 50 RegScavenger *RS = NULL) const; 51 52 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 53 MachineBasicBlock::iterator MI, 54 const std::vector<CalleeSavedInfo> &CSI, 55 const TargetRegisterInfo *TRI) const; 56 57 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 58 MachineBasicBlock::iterator MI, 59 const std::vector<CalleeSavedInfo> &CSI, 60 const TargetRegisterInfo *TRI) const; 61 62 bool hasFP(const MachineFunction &MF) const; 63 bool hasReservedCallFrame(const MachineFunction &MF) const; 64 65 int getFrameIndexOffset(const MachineFunction &MF, int FI) const; 66 int getFrameIndexReference(const MachineFunction &MF, int FI, 67 unsigned &FrameReg) const; 68 69 void eliminateCallFramePseudoInstr(MachineFunction &MF, 70 MachineBasicBlock &MBB, 71 MachineBasicBlock::iterator MI) const; 72}; 73 74} // End llvm namespace 75 76#endif 77