llvm-6502/lib/Target/Mos6502/Mos6502InstrInfo.h

//===-- Mos6502InstrInfo.h - Mos6502 Instruction Information --------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the Mos6502 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_MOS6502_MOS6502INSTRINFO_H
#define LLVM_LIB_TARGET_MOS6502_MOS6502INSTRINFO_H

#include "Mos6502RegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"

#define GET_INSTRINFO_HEADER
#include "Mos6502GenInstrInfo.inc"

namespace llvm {

class Mos6502Subtarget;

/// SPII - This namespace holds all of the target specific flags that
/// instruction info tracks.
///
namespace SPII {
  enum {
    Pseudo = (1<<0),
    Load = (1<<1),
    Store = (1<<2),
    DelaySlot = (1<<3)
  };
}

class Mos6502InstrInfo : public Mos6502GenInstrInfo {
  const Mos6502RegisterInfo RI;
  const Mos6502Subtarget& Subtarget;
  virtual void anchor();
public:
  explicit Mos6502InstrInfo(Mos6502Subtarget &ST);

  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
  /// such, whenever a client has an instance of instruction info, it should
  /// always be able to get register info as well (through this method).
  ///
  const Mos6502RegisterInfo &getRegisterInfo() const { return RI; }

  /// isLoadFromStackSlot - If the specified machine instruction is a direct
  /// load from a stack slot, return the virtual or physical register number of
  /// the destination along with the FrameIndex of the loaded stack slot.  If
  /// not, return 0.  This predicate must return 0 if the instruction has
  /// any side effects other than loading from the stack slot.
  unsigned isLoadFromStackSlot(const MachineInstr *MI,
                               int &FrameIndex) const override;

  /// isStoreToStackSlot - If the specified machine instruction is a direct
  /// store to a stack slot, return the virtual or physical register number of
  /// the source reg along with the FrameIndex of the loaded stack slot.  If
  /// not, return 0.  This predicate must return 0 if the instruction has
  /// any side effects other than storing to the stack slot.
  unsigned isStoreToStackSlot(const MachineInstr *MI,
                              int &FrameIndex) const override;

  bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
                     MachineBasicBlock *&FBB,
                     SmallVectorImpl<MachineOperand> &Cond,
                     bool AllowModify = false) const override ;

  unsigned RemoveBranch(MachineBasicBlock &MBB) const override;

  unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
                        MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
                        DebugLoc DL) const override;

  void copyPhysReg(MachineBasicBlock &MBB,
                   MachineBasicBlock::iterator I, DebugLoc DL,
                   unsigned DestReg, unsigned SrcReg,
                   bool KillSrc) const override;

  void storeRegToStackSlot(MachineBasicBlock &MBB,
                           MachineBasicBlock::iterator MBBI,
                           unsigned SrcReg, bool isKill, int FrameIndex,
                           const TargetRegisterClass *RC,
                           const TargetRegisterInfo *TRI) const override;

  void loadRegFromStackSlot(MachineBasicBlock &MBB,
                            MachineBasicBlock::iterator MBBI,
                            unsigned DestReg, int FrameIndex,
                            const TargetRegisterClass *RC,
                            const TargetRegisterInfo *TRI) const override;

  unsigned getGlobalBaseReg(MachineFunction *MF) const;
};

}

#endif