lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.h

//===- HexagonMCCodeEmitter.h - Hexagon Target Descriptions -----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief Definition for classes that emit Hexagon machine code from MCInsts
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_HEXAGON_MCTARGETDESC_HEXAGONMCCODEEMITTER_H
#define LLVM_LIB_TARGET_HEXAGON_MCTARGETDESC_HEXAGONMCCODEEMITTER_H

#include "MCTargetDesc/HexagonFixupKinds.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/SubtargetFeature.h"
#include <cstddef>
#include <cstdint>
#include <memory>

namespace llvm {

class MCContext;
class MCInst;
class MCInstrInfo;
class MCOperand;
class MCSubtargetInfo;
class raw_ostream;

class HexagonMCCodeEmitter : public MCCodeEmitter {
  MCContext &MCT;
  MCInstrInfo const &MCII;
  std::unique_ptr<unsigned> Addend;
  std::unique_ptr<bool> Extended;
  std::unique_ptr<MCInst const *> CurrentBundle;
  std::unique_ptr<size_t> CurrentIndex;

  // helper routine for getMachineOpValue()
  unsigned getExprOpValue(const MCInst &MI, const MCOperand &MO,
                          const MCExpr *ME, SmallVectorImpl<MCFixup> &Fixups,
                          const MCSubtargetInfo &STI) const;

  Hexagon::Fixups getFixupNoBits(MCInstrInfo const &MCII, const MCInst &MI,
                                 const MCOperand &MO,
                                 const MCSymbolRefExpr::VariantKind kind) const;

public:
  HexagonMCCodeEmitter(MCInstrInfo const &aMII, MCContext &aMCT);

  // Return parse bits for instruction `MCI' inside bundle `MCB'
  uint32_t parseBits(size_t Last, MCInst const &MCB, MCInst const &MCI) const;

  void encodeInstruction(MCInst const &MI, raw_ostream &OS,
                         SmallVectorImpl<MCFixup> &Fixups,
                         MCSubtargetInfo const &STI) const override;

  void EncodeSingleInstruction(const MCInst &MI, raw_ostream &OS,
                               SmallVectorImpl<MCFixup> &Fixups,
                               const MCSubtargetInfo &STI,
                               uint32_t Parse) const;

  // \brief TableGen'erated function for getting the
  // binary encoding for an instruction.
  uint64_t getBinaryCodeForInstr(MCInst const &MI,
                                 SmallVectorImpl<MCFixup> &Fixups,
                                 MCSubtargetInfo const &STI) const;

  /// \brief Return binary encoding of operand.
  unsigned getMachineOpValue(MCInst const &MI, MCOperand const &MO,
                             SmallVectorImpl<MCFixup> &Fixups,
                             MCSubtargetInfo const &STI) const;

private:
  uint64_t computeAvailableFeatures(const FeatureBitset &FB) const;
  void verifyInstructionPredicates(const MCInst &MI,
                                   uint64_t AvailableFeatures) const;
};

} // end namespace llvm

#endif // LLVM_LIB_TARGET_HEXAGON_MCTARGETDESC_HEXAGONMCCODEEMITTER_H