Move getInitialFrameState from TargetFrameInfo to MCAsmInfo (suggestions for
[oota-llvm.git] / lib / Target / X86 / X86FrameLowering.h
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
21 namespace llvm {
22   class MCSymbol;
23   class X86TargetMachine;
24
25 class X86FrameLowering : public TargetFrameLowering {
26   const X86TargetMachine &TM;
27   const X86Subtarget &STI;
28 public:
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   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
61
62   uint32_t getCompactUnwindEncoding(ArrayRef<MCCFIInstruction> Instrs,
63                                     int DataAlignmentFactor, bool IsEH) const;
64 };
65
66 } // End llvm namespace
67
68 #endif