MoveEmitter-x86-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_MoveEmitter_x86_shared_h

#define jit_MoveEmitter_x86_shared_h

#include "mozilla/Maybe.h"

#include <stddef.h>

#include <stdint.h>

#include "jit/MoveResolver.h"

#include "jit/Registers.h"

namespace js {

namespace jit {

struct Address;

class MacroAssembler;

class Operand;

class MoveEmitterX86 {

  bool inCycle_;

  MacroAssembler& masm;

  // Original stack push value.

  uint32_t pushedAtStart_;

  // This is a store stack offset for the cycle-break spill slot, snapshotting

  // codegen->framePushed_ at the time it is allocated. -1 if not allocated.

  int32_t pushedAtCycle_;

#ifdef JS_CODEGEN_X86

  // Optional scratch register for performing moves.

  mozilla::Maybe<Register> scratchRegister_;

#endif

  void assertDone();

  Address cycleSlot();

  Address toAddress(const MoveOperand& operand) const;

  Operand toOperand(const MoveOperand& operand) const;

  Operand toPopOperand(const MoveOperand& operand) const;

  size_t characterizeCycle(const MoveResolver& moves, size_t i,

                           bool* allGeneralRegs, bool* allFloatRegs);

  bool maybeEmitOptimizedCycle(const MoveResolver& moves, size_t i,

                               bool allGeneralRegs, bool allFloatRegs,

                               size_t swapCount);

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

                     const MoveResolver& moves, size_t i);

  void emitGeneralMove(const MoveOperand& from, const MoveOperand& to,

                       const MoveResolver& moves, size_t i);

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

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

  void emitSimd128Move(const MoveOperand& from, const MoveOperand& to);

  void breakCycle(const MoveOperand& to, MoveOp::Type type);

  void completeCycle(const MoveOperand& to, MoveOp::Type type);

 public:

  explicit MoveEmitterX86(MacroAssembler& masm);

  ~MoveEmitterX86();

  void emit(const MoveResolver& moves);

  void finish();

  void setScratchRegister(Register reg) {

#ifdef JS_CODEGEN_X86

    scratchRegister_.emplace(reg);

#endif

  mozilla::Maybe<Register> findScratchRegister(const MoveResolver& moves,

                                               size_t i);

};

using MoveEmitter = MoveEmitterX86;

}  // namespace jit

}  // namespace js

#endif /* jit_MoveEmitter_x86_shared_h */