ARMRegisterInfo.h

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//===- ARMRegisterInfo.h - ARM Register Information Impl --------*- 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 ARM implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef ARMREGISTERINFO_H
#define ARMREGISTERINFO_H

#include "llvm/Target/TargetRegisterInfo.h"
#include "ARMGenRegisterInfo.h.inc"

namespace llvm {
  class ARMSubtarget;
  class TargetInstrInfo;
  class Type;

struct ARMRegisterInfo : public ARMGenRegisterInfo {
  const TargetInstrInfo &TII;
  const ARMSubtarget &STI;
private:
  /// FramePtr - ARM physical register used as frame ptr.
  unsigned FramePtr;

public:
  ARMRegisterInfo(const TargetInstrInfo &tii, const ARMSubtarget &STI);

  /// emitLoadConstPool - Emits a load from constpool to materialize the
  /// specified immediate.
  void emitLoadConstPool(MachineBasicBlock &MBB,
                         MachineBasicBlock::iterator &MBBI,
                         unsigned DestReg, int Val,
                         unsigned Pred, unsigned PredReg,
                         const TargetInstrInfo *TII, bool isThumb) const;

  /// getRegisterNumbering - Given the enum value for some register, e.g.
  /// ARM::LR, return the number that it corresponds to (e.g. 14).
  static unsigned getRegisterNumbering(unsigned RegEnum);

  /// Same as previous getRegisterNumbering except it returns true in isSPVFP
  /// if the register is a single precision VFP register.
  static unsigned getRegisterNumbering(unsigned RegEnum, bool &isSPVFP);

  /// Code Generation virtual methods...
  const unsigned *getCalleeSavedRegs(const MachineFunction *MF = 0) const;

  const TargetRegisterClass* const*
  getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;

  BitVector getReservedRegs(const MachineFunction &MF) const;

  bool isReservedReg(const MachineFunction &MF, unsigned Reg) const;

  bool requiresRegisterScavenging(const MachineFunction &MF) const;

  bool hasFP(const MachineFunction &MF) const;

  bool hasReservedCallFrame(MachineFunction &MF) const;

  void eliminateCallFramePseudoInstr(MachineFunction &MF,
                                     MachineBasicBlock &MBB,
                                     MachineBasicBlock::iterator I) const;

  void eliminateFrameIndex(MachineBasicBlock::iterator II,
                           int SPAdj, RegScavenger *RS = NULL) const;

  void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
                                            RegScavenger *RS = NULL) const;

  void emitPrologue(MachineFunction &MF) const;
  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;

  // Debug information queries.
  unsigned getRARegister() const;
  unsigned getFrameRegister(MachineFunction &MF) const;

  // Exception handling queries.
  unsigned getEHExceptionRegister() const;
  unsigned getEHHandlerRegister() const;

  int getDwarfRegNum(unsigned RegNum, bool isEH) const;
  
  bool isLowRegister(unsigned Reg) const;
};

} // end namespace llvm

#endif