AArch64FrameLowering.h revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f 
1//==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- 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//
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef AArch64_FRAMELOWERING_H
15#define AArch64_FRAMELOWERING_H
16
17#include "llvm/Target/TargetFrameLowering.h"
18
19namespace llvm {
20
21class AArch64Subtarget;
22class AArch64TargetMachine;
23
24class AArch64FrameLowering : public TargetFrameLowering {
25  const AArch64TargetMachine &TM;
26
27public:
28  explicit AArch64FrameLowering(const AArch64TargetMachine &TM,
29                              const AArch64Subtarget &STI)
30      : TargetFrameLowering(StackGrowsDown, 16, 0, 16,
31                            false /*StackRealignable*/),
32        TM(TM) {}
33
34  void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
35                                 MachineBasicBlock::iterator MBBI,
36                                 unsigned FramePtr) const;
37
38  void eliminateCallFramePseudoInstr(MachineFunction &MF,
39                                  MachineBasicBlock &MBB,
40                                  MachineBasicBlock::iterator I) const override;
41
42  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
43  /// the function.
44  void emitPrologue(MachineFunction &MF) const override;
45  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
46
47  int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
48  int getFrameIndexReference(const MachineFunction &MF, int FI,
49                             unsigned &FrameReg) const override;
50  int resolveFrameIndexReference(const MachineFunction &MF, int FI,
51                                 unsigned &FrameReg,
52                                 bool PreferFP = false) const;
53  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
54                                 MachineBasicBlock::iterator MI,
55                                 const std::vector<CalleeSavedInfo> &CSI,
56                                 const TargetRegisterInfo *TRI) const override;
57
58  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
59                                  MachineBasicBlock::iterator MI,
60                                  const std::vector<CalleeSavedInfo> &CSI,
61                                  const TargetRegisterInfo *TRI) const override;
62
63  /// \brief Can this function use the red zone for local allocations.
64  bool canUseRedZone(const MachineFunction &MF) const;
65
66  bool hasFP(const MachineFunction &MF) const override;
67  bool hasReservedCallFrame(const MachineFunction &MF) const override;
68
69  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
70                                            RegScavenger *RS) const override;
71};
72
73} // End llvm namespace
74
75#endif
76