MoveEmitter-mips-shared.h

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/* 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:

  MacroAssembler& masm;

  // Original stack push value.

  uint32_t pushedAtStart_;

  // This stores a stack offset to a spill location, snapshotting

  // `masm.framePushed()` at the time it was allocated. It is -1 if no

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

  int32_t pushedAtCycle_ = -1;

  // Scratch register available for temporary use. It may be assigned

  // InvalidReg.

  Register tempReg_ = InvalidReg;

  uint32_t inCycle_ = 0;

  void assertDone() { MOZ_ASSERT(inCycle_ == 0); }

  Register tempReg();

  Address cycleSlot(uint32_t slot) const;

  int32_t getAdjustedOffset(const MoveOperand& operand) const;

  Address getAdjustedAddress(const MoveOperand& operand) const;

  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& 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:

  explicit MoveEmitterMIPSShared(MacroAssembler& masm)

      : masm(masm), pushedAtStart_(masm.framePushed()) {}

  ~MoveEmitterMIPSShared() { assertDone(); }

  void emit(const MoveResolver& moves);

  void finish();

};

}  // namespace jit

}  // namespace js

#endif /* jit_mips_shared_MoveEmitter_mips_shared_h */