ARMFrameLowering.h revision 218885 
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 "ARM.h"
18#include "ARMSubtarget.h"
19#include "llvm/Target/TargetFrameLowering.h"
20
21namespace llvm {
22  class ARMSubtarget;
23
24class ARMFrameLowering : public TargetFrameLowering {
25protected:
26  const ARMSubtarget &STI;
27
28public:
29  explicit ARMFrameLowering(const ARMSubtarget &sti)
30    : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
31      STI(sti) {
32  }
33
34  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
35  /// the function.
36  void emitPrologue(MachineFunction &MF) const;
37  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
38
39  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
40                                 MachineBasicBlock::iterator MI,
41                                 const std::vector<CalleeSavedInfo> &CSI,
42                                 const TargetRegisterInfo *TRI) const;
43
44  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
45                                   MachineBasicBlock::iterator MI,
46                                   const std::vector<CalleeSavedInfo> &CSI,
47                                   const TargetRegisterInfo *TRI) const;
48
49  bool hasFP(const MachineFunction &MF) const;
50  bool hasReservedCallFrame(const MachineFunction &MF) const;
51  bool canSimplifyCallFramePseudos(const MachineFunction &MF) const;
52  int getFrameIndexReference(const MachineFunction &MF, int FI,
53                             unsigned &FrameReg) const;
54  int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
55                                 unsigned &FrameReg, int SPAdj) const;
56  int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
57
58  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
59                                            RegScavenger *RS) const;
60
61 private:
62  void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
63                    const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
64                    unsigned StrOpc, bool NoGap,
65                    bool(*Func)(unsigned, bool)) const;
66  void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
67                   const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
68                   unsigned LdrOpc, bool isVarArg, bool NoGap,
69                   bool(*Func)(unsigned, bool)) const;
70};
71
72} // End llvm namespace
73
74#endif
75