X86FrameLowering.h revision 6a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4 
1//=-- X86TargetFrameLowering.h - Define frame lowering for X86 ---*- 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// This class implements X86-specific bits of TargetFrameLowering class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef X86_FRAMELOWERING_H
15#define X86_FRAMELOWERING_H
16
17#include "X86Subtarget.h"
18#include "llvm/MC/MCDwarf.h"
19#include "llvm/Target/TargetFrameLowering.h"
20
21namespace llvm {
22  class MCSymbol;
23  class X86TargetMachine;
24
25class X86FrameLowering : public TargetFrameLowering {
26  const X86TargetMachine &TM;
27  const X86Subtarget &STI;
28public:
29  explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti)
30    : TargetFrameLowering(StackGrowsDown,
31                          sti.getStackAlignment(),
32                          (sti.is64Bit() ? -8 : -4)),
33      TM(tm), STI(sti) {
34  }
35
36  void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label,
37                                 unsigned FramePtr) const;
38
39  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
40  /// the function.
41  void emitPrologue(MachineFunction &MF) const;
42  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
43
44  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
45                                            RegScavenger *RS = NULL) const;
46
47  bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
48                                 MachineBasicBlock::iterator MI,
49                                 const std::vector<CalleeSavedInfo> &CSI,
50                                 const TargetRegisterInfo *TRI) const;
51
52  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
53                                   MachineBasicBlock::iterator MI,
54                                   const std::vector<CalleeSavedInfo> &CSI,
55                                   const TargetRegisterInfo *TRI) const;
56
57  bool hasFP(const MachineFunction &MF) const;
58  bool hasReservedCallFrame(const MachineFunction &MF) const;
59
60  void getInitialFrameState(std::vector<MachineMove> &Moves) const;
61  int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
62
63  uint32_t getCompactUnwindEncoding(const std::vector<MCCFIInstruction> &Instrs,
64                                    int DataAlignmentFactor, bool IsEH) const;
65};
66
67} // End llvm namespace
68
69#endif
70