1//=- SystemZFrameLowering.h - Define frame lowering for z/System -*- 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 SYSTEMZ_FRAMEINFO_H
15#define SYSTEMZ_FRAMEINFO_H
16
17#include "SystemZ.h"
18#include "SystemZSubtarget.h"
19#include "llvm/Target/TargetFrameLowering.h"
20#include "llvm/ADT/IndexedMap.h"
21
22namespace llvm {
23  class SystemZSubtarget;
24
25class SystemZFrameLowering : public TargetFrameLowering {
26  IndexedMap<unsigned> RegSpillOffsets;
27protected:
28  const SystemZSubtarget &STI;
29
30public:
31  explicit SystemZFrameLowering(const SystemZSubtarget &sti);
32
33  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
34  /// the function.
35  void emitPrologue(MachineFunction &MF) const;
36  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
37
38  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
39                                 MachineBasicBlock::iterator MI,
40                                 const std::vector<CalleeSavedInfo> &CSI,
41                                 const TargetRegisterInfo *TRI) const;
42  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
43                                   MachineBasicBlock::iterator MI,
44                                   const std::vector<CalleeSavedInfo> &CSI,
45                                   const TargetRegisterInfo *TRI) const;
46
47  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
48                                            RegScavenger *RS) const;
49
50  bool hasReservedCallFrame(const MachineFunction &MF) const { return true; }
51  bool hasFP(const MachineFunction &MF) const;
52  int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
53};
54
55} // End llvm namespace
56
57#endif
58