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/Target/TargetFrameLowering.h"
  19
  20 namespace llvm {
  21   class MCSymbol;
  22   class X86TargetMachine;
  23
  24 class X86FrameLowering : public TargetFrameLowering {
  25   const X86TargetMachine &TM;
  26   const X86Subtarget &STI;
  27 public:
  28   explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti)
  29     : TargetFrameLowering(StackGrowsDown,
  30                           sti.getStackAlignment(),
  31                           (sti.is64Bit() ? -8 : -4)),
  32       TM(tm), STI(sti) {
  33   }
  34
  35   void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label,
  36                                  unsigned FramePtr) const;
  37
  38   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  39   /// the function.
  40   void emitPrologue(MachineFunction &MF) const;
  41   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  42
  43   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  44                                             RegScavenger *RS = NULL) const;
  45
  46   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  47                                  MachineBasicBlock::iterator MI,
  48                                  const std::vector<CalleeSavedInfo> &CSI,
  49                                  const TargetRegisterInfo *TRI) const;
  50
  51   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  52                                    MachineBasicBlock::iterator MI,
  53                                    const std::vector<CalleeSavedInfo> &CSI,
  54                                    const TargetRegisterInfo *TRI) const;
  55
  56   bool hasFP(const MachineFunction &MF) const;
  57   bool hasReservedCallFrame(const MachineFunction &MF) const;
  58
  59   void getInitialFrameState(std::vector<MachineMove> &Moves) const;
  60   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
  61 };
  62
  63 } // End llvm namespace
  64
  65 #endif