//===- MipsRegisterInfo.h - Mips 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 Mips implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef MIPSREGISTERINFO_H
#define MIPSREGISTERINFO_H

#include "Mips.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "MipsGenRegisterInfo.h.inc"

namespace llvm {
class MipsSubtarget;
class TargetInstrInfo;
class Type;

namespace Mips {
  /// SubregIndex - The index of various sized subregister classes. Note that 
  /// these indices must be kept in sync with the class indices in the 
  /// MipsRegisterInfo.td file.
  enum SubregIndex {
    SUBREG_FPEVEN = 1, SUBREG_FPODD = 2
  };
}

struct MipsRegisterInfo : public MipsGenRegisterInfo {
  const MipsSubtarget &Subtarget;
  const TargetInstrInfo &TII;
  
  MipsRegisterInfo(const MipsSubtarget &Subtarget, const TargetInstrInfo &tii);

  /// getRegisterNumbering - Given the enum value for some register, e.g.
  /// Mips::RA, return the number that it corresponds to (e.g. 31).
  static unsigned getRegisterNumbering(unsigned RegEnum);

  /// Get PIC indirect call register
  static unsigned getPICCallReg();

  /// Adjust the Mips stack frame.
  void adjustMipsStackFrame(MachineFunction &MF) const;

  /// 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 hasFP(const MachineFunction &MF) const;

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

  /// Stack Frame Processing Methods
  unsigned eliminateFrameIndex(MachineBasicBlock::iterator II,
                               int SPAdj, int *Value = NULL,
                               RegScavenger *RS = NULL) const;

  void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;

  void emitPrologue(MachineFunction &MF) const;
  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  
  /// Debug information queries.
  unsigned getRARegister() const;
  unsigned getFrameRegister(const MachineFunction &MF) const;

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

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

} // end namespace llvm

#endif
