//===-- SystemZMCTargetDesc.h - SystemZ target descriptions -----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef SYSTEMZMCTARGETDESC_H
#define SYSTEMZMCTARGETDESC_H

#include "llvm/Support/DataTypes.h"

namespace llvm {

class MCAsmBackend;
class MCCodeEmitter;
class MCContext;
class MCInstrInfo;
class MCObjectWriter;
class MCRegisterInfo;
class MCSubtargetInfo;
class StringRef;
class Target;
class raw_ostream;

extern Target TheSystemZTarget;

namespace SystemZMC {
  // How many bytes are in the ABI-defined, caller-allocated part of
  // a stack frame.
  const int64_t CallFrameSize = 160;

  // The offset of the DWARF CFA from the incoming stack pointer.
  const int64_t CFAOffsetFromInitialSP = CallFrameSize;

  // Maps of asm register numbers to LLVM register numbers, with 0 indicating
  // an invalid register.  In principle we could use 32-bit and 64-bit register
  // classes directly, provided that we relegated the GPR allocation order
  // in SystemZRegisterInfo.td to an AltOrder and left the default order
  // as %r0-%r15.  It seems better to provide the same interface for
  // all classes though.
  extern const unsigned GR32Regs[16];
  extern const unsigned GRH32Regs[16];
  extern const unsigned GR64Regs[16];
  extern const unsigned GR128Regs[16];
  extern const unsigned FP32Regs[16];
  extern const unsigned FP64Regs[16];
  extern const unsigned FP128Regs[16];

  // Return the 0-based number of the first architectural register that
  // contains the given LLVM register.   E.g. R1D -> 1.
  unsigned getFirstReg(unsigned Reg);

  // Return the given register as a GR64.
  inline unsigned getRegAsGR64(unsigned Reg) {
    return GR64Regs[getFirstReg(Reg)];
  }

  // Return the given register as a low GR32.
  inline unsigned getRegAsGR32(unsigned Reg) {
    return GR32Regs[getFirstReg(Reg)];
  }

  // Return the given register as a high GR32.
  inline unsigned getRegAsGRH32(unsigned Reg) {
    return GRH32Regs[getFirstReg(Reg)];
  }
}

MCCodeEmitter *createSystemZMCCodeEmitter(const MCInstrInfo &MCII,
                                          const MCRegisterInfo &MRI,
                                          const MCSubtargetInfo &STI,
                                          MCContext &Ctx);

MCAsmBackend *createSystemZMCAsmBackend(const Target &T,
                                        const MCRegisterInfo &MRI,
                                        StringRef TT, StringRef CPU);

MCObjectWriter *createSystemZObjectWriter(raw_ostream &OS, uint8_t OSABI);
} // end namespace llvm

// Defines symbolic names for SystemZ registers.
// This defines a mapping from register name to register number.
#define GET_REGINFO_ENUM
#include "SystemZGenRegisterInfo.inc"

// Defines symbolic names for the SystemZ instructions.
#define GET_INSTRINFO_ENUM
#include "SystemZGenInstrInfo.inc"

#define GET_SUBTARGETINFO_ENUM
#include "SystemZGenSubtargetInfo.inc"

#endif