SystemZFrameLowering.h revision 263508 
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 "SystemZSubtarget.h"
14#include "llvm/ADT/IndexedMap.h"
15#include "llvm/Target/TargetFrameLowering.h"
16
17namespace llvm {
18class SystemZTargetMachine;
19class SystemZSubtarget;
20
21class SystemZFrameLowering : public TargetFrameLowering {
22  IndexedMap<unsigned> RegSpillOffsets;
23
24protected:
25  const SystemZTargetMachine &TM;
26  const SystemZSubtarget &STI;
27
28public:
29  SystemZFrameLowering(const SystemZTargetMachine &tm,
30                       const SystemZSubtarget &sti);
31
32  // Override TargetFrameLowering.
33  virtual bool isFPCloseToIncomingSP() const LLVM_OVERRIDE { return false; }
34  virtual const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
35    LLVM_OVERRIDE;
36  virtual void
37    processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
38                                         RegScavenger *RS) const LLVM_OVERRIDE;
39  virtual bool
40    spillCalleeSavedRegisters(MachineBasicBlock &MBB,
41                              MachineBasicBlock::iterator MBBI,
42                              const std::vector<CalleeSavedInfo> &CSI,
43                              const TargetRegisterInfo *TRI) const
44    LLVM_OVERRIDE;
45  virtual bool
46    restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
47                                MachineBasicBlock::iterator MBBII,
48                                const std::vector<CalleeSavedInfo> &CSI,
49                                const TargetRegisterInfo *TRI) const
50    LLVM_OVERRIDE;
51  virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF,
52                                                   RegScavenger *RS) const;
53  virtual void emitPrologue(MachineFunction &MF) const LLVM_OVERRIDE;
54  virtual void emitEpilogue(MachineFunction &MF,
55                            MachineBasicBlock &MBB) const LLVM_OVERRIDE;
56  virtual bool hasFP(const MachineFunction &MF) const LLVM_OVERRIDE;
57  virtual int getFrameIndexOffset(const MachineFunction &MF,
58                                  int FI) const LLVM_OVERRIDE;
59  virtual bool hasReservedCallFrame(const MachineFunction &MF) const
60    LLVM_OVERRIDE;
61  virtual void
62  eliminateCallFramePseudoInstr(MachineFunction &MF,
63                                MachineBasicBlock &MBB,
64                                MachineBasicBlock::iterator MI) const
65    LLVM_OVERRIDE;
66
67  // Return the number of bytes in the callee-allocated part of the frame.
68  uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
69
70  // Return the byte offset from the incoming stack pointer of Reg's
71  // ABI-defined save slot.  Return 0 if no slot is defined for Reg.
72  unsigned getRegSpillOffset(unsigned Reg) const {
73    return RegSpillOffsets[Reg];
74  }
75};
76} // end namespace llvm
77
78#endif
79