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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
23 class MCSymbol;
24 class X86TargetMachine;
25
26 class X86FrameLowering : public TargetFrameLowering {
27   const X86TargetMachine &TM;
28   const X86Subtarget &STI;
29 public:
30   explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti)
31     : TargetFrameLowering(StackGrowsDown,
32                           sti.getStackAlignment(),
33                           (sti.is64Bit() ? -8 : -4)),
34       TM(tm), STI(sti) {
35   }
36
37   void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label,
38                                  unsigned FramePtr) const;
39
40   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
41   /// the function.
42   void emitPrologue(MachineFunction &MF) const;
43   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
44
45   void adjustForSegmentedStacks(MachineFunction &MF) const;
46
47   void adjustForHiPEPrologue(MachineFunction &MF) const;
48
49   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
50                                             RegScavenger *RS = NULL) const;
51
52   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
53                                  MachineBasicBlock::iterator MI,
54                                  const std::vector<CalleeSavedInfo> &CSI,
55                                  const TargetRegisterInfo *TRI) const;
56
57   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
58                                    MachineBasicBlock::iterator MI,
59                                    const std::vector<CalleeSavedInfo> &CSI,
60                                    const TargetRegisterInfo *TRI) const;
61
62   bool hasFP(const MachineFunction &MF) const;
63   bool hasReservedCallFrame(const MachineFunction &MF) const;
64
65   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
66   int getFrameIndexReference(const MachineFunction &MF, int FI,
67                              unsigned &FrameReg) const;
68
69   void eliminateCallFramePseudoInstr(MachineFunction &MF,
70                                      MachineBasicBlock &MBB,
71                                      MachineBasicBlock::iterator MI) const;
72 };
73
74 } // End llvm namespace
75
76 #endif