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 class MCSymbol; 23 class X86TargetMachine; 24 25class X86FrameLowering : public TargetFrameLowering { 26 const X86TargetMachine &TM; 27 const X86Subtarget &STI; 28public: 29 explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti) 30 : TargetFrameLowering(StackGrowsDown, 31 sti.getStackAlignment(), 32 (sti.is64Bit() ? -8 : -4)), 33 TM(tm), STI(sti) { 34 } 35 36 void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label, 37 unsigned FramePtr) const; 38 39 /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 40 /// the function. 41 void emitPrologue(MachineFunction &MF) const; 42 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const; 43 44 void adjustForSegmentedStacks(MachineFunction &MF) const; 45 46 void adjustForHiPEPrologue(MachineFunction &MF) const; 47 48 void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 49 RegScavenger *RS = NULL) const; 50 51 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 52 MachineBasicBlock::iterator MI, 53 const std::vector<CalleeSavedInfo> &CSI, 54 const TargetRegisterInfo *TRI) const; 55 56 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 57 MachineBasicBlock::iterator MI, 58 const std::vector<CalleeSavedInfo> &CSI, 59 const TargetRegisterInfo *TRI) const; 60 61 bool hasFP(const MachineFunction &MF) const; 62 bool hasReservedCallFrame(const MachineFunction &MF) const; 63 64 int getFrameIndexOffset(const MachineFunction &MF, int FI) const; 65 int getFrameIndexReference(const MachineFunction &MF, int FI, 66 unsigned &FrameReg) const; 67 uint32_t getCompactUnwindEncoding(MachineFunction &MF) 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