//===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//

//

//                     The LLVM Compiler Infrastructure

//

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

// License. See LICENSE.TXT for details.

//

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

#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H

#define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H

#include "MCTargetDesc/ARMFixupKinds.h"

#include "MCTargetDesc/ARMMCTargetDesc.h"

#include "llvm/MC/MCAsmBackend.h"

#include "llvm/MC/MCSubtargetInfo.h"

#include "llvm/Support/TargetRegistry.h"

namespace llvm_ks {

class ARMAsmBackend : public MCAsmBackend {

  const MCSubtargetInfo *STI;

  bool isThumbMode;    // Currently emitting Thumb code.

  bool IsLittleEndian; // Big or little endian.

public:

  ARMAsmBackend(const Target &T, const Triple &TT, bool IsLittle)

      : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),

        isThumbMode(TT.getArchName().startswith("thumb")),

        IsLittleEndian(IsLittle) {}

  ~ARMAsmBackend() override { delete STI; }

  unsigned getNumFixupKinds() const override {

    return ARM::NumTargetFixupKinds;

  }

  bool hasNOP() const { return STI->getFeatureBits()[ARM::HasV6T2Ops]; }

  const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;

  /// processFixupValue - Target hook to process the literal value of a fixup

  /// if necessary.

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

                         const MCFixup &Fixup, const MCFragment *DF,

                         const MCValue &Target, uint64_t &Value,

                         bool &IsResolved) override;

  unsigned adjustFixupValue(const MCFixup &Fixup, uint64_t Value, bool IsPCRel,

                            MCContext *Ctx, bool IsLittleEndian,

                            bool IsResolved) const;

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

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

  unsigned getRelaxedOpcode(unsigned Op) const;

  bool mayNeedRelaxation(const MCInst &Inst) const override;

  const char *reasonForFixupRelaxation(const MCFixup &Fixup,

                                       uint64_t Value) const;

  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,

                            const MCRelaxableFragment *DF,

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

  void relaxInstruction(const MCInst &Inst, MCInst &Res) const override;

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

  void handleAssemblerFlag(MCAssemblerFlag Flag) override;

  unsigned getPointerSize() const { return 4; }

  bool isThumb() const { return isThumbMode; }

  void setIsThumb(bool it) { isThumbMode = it; }

  bool isLittle() const { return IsLittleEndian; }

};

} // end namespace llvm_ks

#endif