lib/Target/ARM64/ARM64FrameLowering.h

   1 //===-- ARM64FrameLowering.h - TargetFrameLowering for ARM64 ----*- 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 //
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ARM64_FRAMELOWERING_H
  15 #define ARM64_FRAMELOWERING_H
  16
  17 #include "llvm/Target/TargetFrameLowering.h"
  18
  19 namespace llvm {
  20
  21 class ARM64Subtarget;
  22 class ARM64TargetMachine;
  23
  24 class ARM64FrameLowering : public TargetFrameLowering {
  25   const ARM64TargetMachine &TM;
  26
  27 public:
  28   explicit ARM64FrameLowering(const ARM64TargetMachine &TM,
  29                               const ARM64Subtarget &STI)
  30       : TargetFrameLowering(StackGrowsDown, 16, 0, 16,
  31                             false /*StackRealignable*/),
  32         TM(TM) {}
  33
  34   void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
  35                                  MachineBasicBlock::iterator MBBI,
  36                                  unsigned FramePtr) const;
  37
  38   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  39                                   MachineBasicBlock &MBB,
  40                                   MachineBasicBlock::iterator I) const override;
  41
  42   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  43   /// the function.
  44   void emitPrologue(MachineFunction &MF) const override;
  45   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  46
  47   int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
  48   int getFrameIndexReference(const MachineFunction &MF, int FI,
  49                              unsigned &FrameReg) const override;
  50   int resolveFrameIndexReference(const MachineFunction &MF, int FI,
  51                                  unsigned &FrameReg,
  52                                  bool PreferFP = false) const;
  53   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  54                                  MachineBasicBlock::iterator MI,
  55                                  const std::vector<CalleeSavedInfo> &CSI,
  56                                  const TargetRegisterInfo *TRI) const override;
  57
  58   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  59                                   MachineBasicBlock::iterator MI,
  60                                   const std::vector<CalleeSavedInfo> &CSI,
  61                                   const TargetRegisterInfo *TRI) const override;
  62
  63   /// \brief Can this function use the red zone for local allocations.
  64   bool canUseRedZone(const MachineFunction &MF) const;
  65
  66   bool hasFP(const MachineFunction &MF) const override;
  67   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  68
  69   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  70                                             RegScavenger *RS) const override;
  71 };
  72
  73 } // End llvm namespace
  74
  75 #endif