src/llvm/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 LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
  15 #define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
  16
  17 #include "llvm/Target/TargetFrameLowering.h"
  18
  19 namespace llvm {
  20
  21 class MCSymbol;
  22 class X86TargetMachine;
  23 class X86Subtarget;
  24
  25 class X86FrameLowering : public TargetFrameLowering {
  26 public:
  27   explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
  28     : TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
  29
  30   static void getStackProbeFunction(const X86Subtarget &STI,
  31                                     unsigned &CallOp,
  32                                     const char *&Symbol);
  33
  34   void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
  35                                  MachineBasicBlock::iterator MBBI,
  36                                  DebugLoc DL) const;
  37
  38   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  39   /// the function.
  40   void emitPrologue(MachineFunction &MF) const override;
  41   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  42
  43   void adjustForSegmentedStacks(MachineFunction &MF) const override;
  44
  45   void adjustForHiPEPrologue(MachineFunction &MF) const override;
  46
  47   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  48                                      RegScavenger *RS = nullptr) const override;
  49
  50   bool
  51   assignCalleeSavedSpillSlots(MachineFunction &MF,
  52                               const TargetRegisterInfo *TRI,
  53                               std::vector<CalleeSavedInfo> &CSI) const override;
  54
  55   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  56                                  MachineBasicBlock::iterator MI,
  57                                  const std::vector<CalleeSavedInfo> &CSI,
  58                                  const TargetRegisterInfo *TRI) const override;
  59
  60   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  61                                   MachineBasicBlock::iterator MI,
  62                                   const std::vector<CalleeSavedInfo> &CSI,
  63                                   const TargetRegisterInfo *TRI) const override;
  64
  65   bool hasFP(const MachineFunction &MF) const override;
  66   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  67
  68   int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
  69   int getFrameIndexReference(const MachineFunction &MF, int FI,
  70                              unsigned &FrameReg) const override;
  71
  72   int getFrameIndexOffsetFromSP(const MachineFunction &MF, int FI) const;
  73   int getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI,
  74                                    unsigned &FrameReg) const override;
  75
  76   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  77                                  MachineBasicBlock &MBB,
  78                                  MachineBasicBlock::iterator MI) const override;
  79
  80 private:
  81   /// convertArgMovsToPushes - This method tries to convert a call sequence
  82   /// that uses sub and mov instructions to put the argument onto the stack
  83   /// into a series of pushes.
  84   /// Returns true if the transformation succeeded, false if not.
  85   bool convertArgMovsToPushes(MachineFunction &MF,
  86                               MachineBasicBlock &MBB,
  87                               MachineBasicBlock::iterator I,
  88                               uint64_t Amount) const;
  89 };
  90
  91 } // End llvm namespace
  92
  93 #endif