PPCMCCodeEmitter.h

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//===-- PPCMCCodeEmitter.h - Convert PPC code to machine code -------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the PPCMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_PPC_MCCODEEMITTER_PPCCODEEMITTER_H
#define LLVM_LIB_TARGET_PPC_MCCODEEMITTER_PPCCODEEMITTER_H

#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInst.h"

namespace llvm {

class PPCMCCodeEmitter : public MCCodeEmitter {
  const MCInstrInfo &MCII;
  const MCContext &CTX;
  bool IsLittleEndian;

public:
  PPCMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx)
      : MCII(mcii), CTX(ctx),
        IsLittleEndian(ctx.getAsmInfo()->isLittleEndian()) {}
  PPCMCCodeEmitter(const PPCMCCodeEmitter &) = delete;
  void operator=(const PPCMCCodeEmitter &) = delete;
  ~PPCMCCodeEmitter() override = default;

  unsigned getDirectBrEncoding(const MCInst &MI, unsigned OpNo,
                               SmallVectorImpl<MCFixup> &Fixups,
                               const MCSubtargetInfo &STI) const;
  unsigned getCondBrEncoding(const MCInst &MI, unsigned OpNo,
                             SmallVectorImpl<MCFixup> &Fixups,
                             const MCSubtargetInfo &STI) const;
  unsigned getAbsDirectBrEncoding(const MCInst &MI, unsigned OpNo,
                                  SmallVectorImpl<MCFixup> &Fixups,
                                  const MCSubtargetInfo &STI) const;
  unsigned getAbsCondBrEncoding(const MCInst &MI, unsigned OpNo,
                                SmallVectorImpl<MCFixup> &Fixups,
                                const MCSubtargetInfo &STI) const;
  unsigned getImm16Encoding(const MCInst &MI, unsigned OpNo,
                            SmallVectorImpl<MCFixup> &Fixups,
                            const MCSubtargetInfo &STI) const;
  unsigned getMemRIEncoding(const MCInst &MI, unsigned OpNo,
                            SmallVectorImpl<MCFixup> &Fixups,
                            const MCSubtargetInfo &STI) const;
  unsigned getMemRIXEncoding(const MCInst &MI, unsigned OpNo,
                             SmallVectorImpl<MCFixup> &Fixups,
                             const MCSubtargetInfo &STI) const;
  unsigned getMemRIX16Encoding(const MCInst &MI, unsigned OpNo,
                               SmallVectorImpl<MCFixup> &Fixups,
                               const MCSubtargetInfo &STI) const;
  unsigned getSPE8DisEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups,
                              const MCSubtargetInfo &STI) const;
  unsigned getSPE4DisEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups,
                              const MCSubtargetInfo &STI) const;
  unsigned getSPE2DisEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups,
                              const MCSubtargetInfo &STI) const;
  unsigned getTLSRegEncoding(const MCInst &MI, unsigned OpNo,
                             SmallVectorImpl<MCFixup> &Fixups,
                             const MCSubtargetInfo &STI) const;
  unsigned getTLSCallEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups,
                              const MCSubtargetInfo &STI) const;
  unsigned get_crbitm_encoding(const MCInst &MI, unsigned OpNo,
                               SmallVectorImpl<MCFixup> &Fixups,
                               const MCSubtargetInfo &STI) const;

  /// getMachineOpValue - Return binary encoding of operand. If the machine
  /// operand requires relocation, record the relocation and return zero.
  unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
                             SmallVectorImpl<MCFixup> &Fixups,
                             const MCSubtargetInfo &STI) const;

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

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

  // Get the number of bytes used to encode the given MCInst.
  unsigned getInstSizeInBytes(const MCInst &MI) const;

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

} // namespace llvm

#endif // LLVM_LIB_TARGET_PPC_MCCODEEMITTER_PPCCODEEMITTER_H