MoveEmitter-mips-shared.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef jit_mips_shared_MoveEmitter_mips_shared_h

#define jit_mips_shared_MoveEmitter_mips_shared_h

#include "jit/MacroAssembler.h"

#include "jit/MoveResolver.h"

namespace js {

namespace jit {

class MoveEmitterMIPSShared {

 protected:

  uint32_t inCycle_;

  MacroAssembler& masm;

  // Original stack push value.

  uint32_t pushedAtStart_;

  // These store stack offsets to spill locations, snapshotting

  // codegen->framePushed_ at the time they were allocated. They are -1 if no

  // stack space has been allocated for that particular spill.

  int32_t pushedAtCycle_;

  int32_t pushedAtSpill_;

  // These are registers that are available for temporary use. They may be

  // assigned InvalidReg. If no corresponding spill space has been assigned,

  // then these registers do not need to be spilled.

  Register spilledReg_;

  FloatRegister spilledFloatReg_;

  void assertDone();

  Register tempReg();

  FloatRegister tempFloatReg();

  Address cycleSlot(uint32_t slot, uint32_t subslot = 0) const;

  int32_t getAdjustedOffset(const MoveOperand& operand);

  Address getAdjustedAddress(const MoveOperand& operand);

  void emitMove(const MoveOperand& from, const MoveOperand& to);

  void emitInt32Move(const MoveOperand& from, const MoveOperand& to);

  void emitFloat32Move(const MoveOperand& from, const MoveOperand& to);

  virtual void emitDoubleMove(const MoveOperand& from,

                              const MoveOperand& to) = 0;

  virtual void breakCycle(const MoveOperand& from, const MoveOperand& to,

                          MoveOp::Type type, uint32_t slot) = 0;

  virtual void completeCycle(const MoveOperand& from, const MoveOperand& to,

                             MoveOp::Type type, uint32_t slot) = 0;

  void emit(const MoveOp& move);

 public:

  MoveEmitterMIPSShared(MacroAssembler& masm)

      : inCycle_(0),

        masm(masm),

        pushedAtStart_(masm.framePushed()),

        pushedAtCycle_(-1),

        pushedAtSpill_(-1),

        spilledReg_(InvalidReg),

        spilledFloatReg_(InvalidFloatReg) {}

  ~MoveEmitterMIPSShared() { assertDone(); }

  void emit(const MoveResolver& moves);

  void finish();

  void setScratchRegister(Register reg) {}

};

}  // namespace jit

}  // namespace js

#endif /* jit_mips_shared_MoveEmitter_mips_shared_h */