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
  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(MachineBasicBlock &MBB,
  38                                  MachineBasicBlock::iterator MBBI, DebugLoc DL,
  39                                  unsigned FramePtr) const;
  40
  41   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  42   /// the function.
  43   void emitPrologue(MachineFunction &MF) const;
  44   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  45
  46   void adjustForSegmentedStacks(MachineFunction &MF) const;
  47
  48   void adjustForHiPEPrologue(MachineFunction &MF) const;
  49
  50   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  51                                             RegScavenger *RS = NULL) const;
  52
  53   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  54                                  MachineBasicBlock::iterator MI,
  55                                  const std::vector<CalleeSavedInfo> &CSI,
  56                                  const TargetRegisterInfo *TRI) const;
  57
  58   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  59                                    MachineBasicBlock::iterator MI,
  60                                    const std::vector<CalleeSavedInfo> &CSI,
  61                                    const TargetRegisterInfo *TRI) const;
  62
  63   bool hasFP(const MachineFunction &MF) const;
  64   bool hasReservedCallFrame(const MachineFunction &MF) const;
  65
  66   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
  67   int getFrameIndexReference(const MachineFunction &MF, int FI,
  68                              unsigned &FrameReg) const;
  69
  70   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  71                                      MachineBasicBlock &MBB,
  72                                      MachineBasicBlock::iterator MI) const;
  73 };
  74
  75 } // End llvm namespace
  76
  77 #endif