1//===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- 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#ifndef SYSTEMZFRAMELOWERING_H
11#define SYSTEMZFRAMELOWERING_H
12
13#include "llvm/ADT/IndexedMap.h"
14#include "llvm/Target/TargetFrameLowering.h"
15
16namespace llvm {
17class SystemZTargetMachine;
18class SystemZSubtarget;
19
20class SystemZFrameLowering : public TargetFrameLowering {
21  IndexedMap<unsigned> RegSpillOffsets;
22
23public:
24  SystemZFrameLowering();
25
26  // Override TargetFrameLowering.
27  bool isFPCloseToIncomingSP() const override { return false; }
28  const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
29    override;
30  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
31                                            RegScavenger *RS) const override;
32  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
33                                 MachineBasicBlock::iterator MBBI,
34                                 const std::vector<CalleeSavedInfo> &CSI,
35                                 const TargetRegisterInfo *TRI) const override;
36  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
37                                   MachineBasicBlock::iterator MBBII,
38                                   const std::vector<CalleeSavedInfo> &CSI,
39                                   const TargetRegisterInfo *TRI) const
40    override;
41  void processFunctionBeforeFrameFinalized(MachineFunction &MF,
42                                           RegScavenger *RS) const override;
43  void emitPrologue(MachineFunction &MF) const override;
44  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
45  bool hasFP(const MachineFunction &MF) const override;
46  int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
47  bool hasReservedCallFrame(const MachineFunction &MF) const override;
48  void eliminateCallFramePseudoInstr(MachineFunction &MF,
49                                     MachineBasicBlock &MBB,
50                                     MachineBasicBlock::iterator MI) const
51    override;
52
53  // Return the number of bytes in the callee-allocated part of the frame.
54  uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
55
56  // Return the byte offset from the incoming stack pointer of Reg's
57  // ABI-defined save slot.  Return 0 if no slot is defined for Reg.
58  unsigned getRegSpillOffset(unsigned Reg) const {
59    return RegSpillOffsets[Reg];
60  }
61};
62} // end namespace llvm
63
64#endif
65