ARMFrameLowering.h revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
1//==-- ARMTargetFrameLowering.h - Define frame lowering for ARM --*- 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 ARM_FRAMEINFO_H
15#define ARM_FRAMEINFO_H
16
17#include "ARMSubtarget.h"
18#include "llvm/Target/TargetFrameLowering.h"
19
20namespace llvm {
21  class ARMSubtarget;
22
23class ARMFrameLowering : public TargetFrameLowering {
24protected:
25  const ARMSubtarget &STI;
26
27public:
28  explicit ARMFrameLowering(const ARMSubtarget &sti)
29    : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
30      STI(sti) {
31  }
32
33  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
34  /// the function.
35  void emitPrologue(MachineFunction &MF) const override;
36  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
37
38  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
39                                 MachineBasicBlock::iterator MI,
40                                 const std::vector<CalleeSavedInfo> &CSI,
41                                 const TargetRegisterInfo *TRI) const override;
42
43  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
44                                  MachineBasicBlock::iterator MI,
45                                  const std::vector<CalleeSavedInfo> &CSI,
46                                  const TargetRegisterInfo *TRI) const override;
47
48  bool hasFP(const MachineFunction &MF) const override;
49  bool hasReservedCallFrame(const MachineFunction &MF) const override;
50  bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
51  int getFrameIndexReference(const MachineFunction &MF, int FI,
52                             unsigned &FrameReg) const override;
53  int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
54                                 unsigned &FrameReg, int SPAdj) const;
55  int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
56
57  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
58                                            RegScavenger *RS) const override;
59
60  void adjustForSegmentedStacks(MachineFunction &MF) const;
61
62 private:
63  void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
64                    const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
65                    unsigned StrOpc, bool NoGap,
66                    bool(*Func)(unsigned, bool), unsigned NumAlignedDPRCS2Regs,
67                    unsigned MIFlags = 0) const;
68  void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
69                   const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
70                   unsigned LdrOpc, bool isVarArg, bool NoGap,
71                   bool(*Func)(unsigned, bool),
72                   unsigned NumAlignedDPRCS2Regs) const;
73
74  void
75  eliminateCallFramePseudoInstr(MachineFunction &MF,
76                                MachineBasicBlock &MBB,
77                                MachineBasicBlock::iterator MI) const override;
78};
79
80} // End llvm namespace
81
82#endif
83