//===-- MipsAsmBackend.h - Mips Asm Backend  ------------------------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

//

// This file defines the MipsAsmBackend class.

//

//===----------------------------------------------------------------------===//

//

#ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSASMBACKEND_H

#define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSASMBACKEND_H

#include "MCTargetDesc/MipsFixupKinds.h"

#include "llvm/ADT/Triple.h"

#include "llvm/MC/MCAsmBackend.h"

namespace llvm_ks {

class MCAssembler;

struct MCFixupKindInfo;

class Target;

class MCObjectWriter;

class MipsAsmBackend : public MCAsmBackend {

  Triple::OSType OSType;

  bool IsLittle; // Big or little endian

  bool Is64Bit;  // 32 or 64 bit words

public:

  MipsAsmBackend(const Target &T, Triple::OSType OSType, bool IsLittle,

                 bool Is64Bit)

      : MCAsmBackend(), OSType(OSType), IsLittle(IsLittle), Is64Bit(Is64Bit) {}

  MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;

  void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,

                  uint64_t Value, bool IsPCRel, unsigned int &KsError) const override;

  Optional<MCFixupKind> getFixupKind(StringRef Name) const override;

  const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;

  unsigned getNumFixupKinds() const override {

    return Mips::NumTargetFixupKinds;

  }

  /// @name Target Relaxation Interfaces

  /// @{

  /// MayNeedRelaxation - Check whether the given instruction may need

  /// relaxation.

  ///

  /// \param Inst - The instruction to test.

  bool mayNeedRelaxation(const MCInst &Inst) const override {

    return false;

  }

  /// fixupNeedsRelaxation - Target specific predicate for whether a given

  /// fixup requires the associated instruction to be relaxed.

   bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,

                             const MCRelaxableFragment *DF,

                             const MCAsmLayout &Layout, unsigned &KsError) const override {

    // FIXME.

    llvm_unreachable("RelaxInstruction() unimplemented");

    return false;

  }

  /// RelaxInstruction - Relax the instruction in the given fragment

  /// to the next wider instruction.

  ///

  /// \param Inst - The instruction to relax, which may be the same

  /// as the output.

  /// \param [out] Res On return, the relaxed instruction.

  void relaxInstruction(const MCInst &Inst, MCInst &Res) const override {}

  /// @}

  bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;

  void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,

                         const MCFixup &Fixup, const MCFragment *DF,

                         const MCValue &Target, uint64_t &Value,

                         bool &IsResolved) override;

}; // class MipsAsmBackend

} // namespace

#endif