hanchenye-llvm-project/llvm/lib/Target/Sparc/SparcFrameLowering.h

//===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
#define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H

#include "Sparc.h"
#include "llvm/CodeGen/TargetFrameLowering.h"

namespace llvm {

class SparcSubtarget;
class SparcFrameLowering : public TargetFrameLowering {
public:
  explicit SparcFrameLowering(const SparcSubtarget &ST);

  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  /// the function.
  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;

  MachineBasicBlock::iterator
  eliminateCallFramePseudoInstr(MachineFunction &MF,
                                MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator I) const override;

  bool hasReservedCallFrame(const MachineFunction &MF) const override;
  bool hasFP(const MachineFunction &MF) const override;
  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                            RegScavenger *RS = nullptr) const override;

  int getFrameIndexReference(const MachineFunction &MF, int FI,
                             unsigned &FrameReg) const override;

  /// targetHandlesStackFrameRounding - Returns true if the target is
  /// responsible for rounding up the stack frame (probably at emitPrologue
  /// time).
  bool targetHandlesStackFrameRounding() const override { return true; }

private:
  // Remap input registers to output registers for leaf procedure.
  void remapRegsForLeafProc(MachineFunction &MF) const;

  // Returns true if MF is a leaf procedure.
  bool isLeafProc(MachineFunction &MF) const;


  // Emits code for adjusting SP in function prologue/epilogue.
  void emitSPAdjustment(MachineFunction &MF,
                        MachineBasicBlock &MBB,
                        MachineBasicBlock::iterator MBBI,
                        int NumBytes, unsigned ADDrr, unsigned ADDri) const;

};

} // End llvm namespace

#endif