xref: /freebsd-11.0-release/contrib/llvm/lib/Target/AArch64/AArch64FrameLowering.h

//==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- C++ -*-==//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//
//===----------------------------------------------------------------------===//

#ifndef AArch64_FRAMELOWERING_H
#define AArch64_FRAMELOWERING_H

#include "llvm/Target/TargetFrameLowering.h"

namespace llvm {

class AArch64FrameLowering : public TargetFrameLowering {
public:
  explicit AArch64FrameLowering()
      : TargetFrameLowering(StackGrowsDown, 16, 0, 16,
                            false /*StackRealignable*/) {}

  void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
                                 MachineBasicBlock::iterator MBBI,
                                 unsigned FramePtr) const;

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

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

  int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
  int getFrameIndexReference(const MachineFunction &MF, int FI,
                             unsigned &FrameReg) const override;
  int resolveFrameIndexReference(const MachineFunction &MF, int FI,
                                 unsigned &FrameReg,
                                 bool PreferFP = false) const;
  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
                                 MachineBasicBlock::iterator MI,
                                 const std::vector<CalleeSavedInfo> &CSI,
                                 const TargetRegisterInfo *TRI) const override;

  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
                                  MachineBasicBlock::iterator MI,
                                  const std::vector<CalleeSavedInfo> &CSI,
                                  const TargetRegisterInfo *TRI) const override;

  /// \brief Can this function use the red zone for local allocations.
  bool canUseRedZone(const MachineFunction &MF) const;

  bool hasFP(const MachineFunction &MF) const override;
  bool hasReservedCallFrame(const MachineFunction &MF) const override;

  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
                                            RegScavenger *RS) const override;
};

} // End llvm namespace

#endif