mozjs_sys 0.67.1

System crate for the Mozilla SpiderMonkey JavaScript engine.
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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 "jit/MacroAssembler.h"
#include "jit/MoveResolver.h"

namespace js {
namespace jit {

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 emitSimd128FloatMove(const MoveOperand& from, const MoveOperand& to);
  void emitSimd128IntMove(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);
};

typedef MoveEmitterX86 MoveEmitter;

}  // namespace jit
}  // namespace js

#endif /* jit_MoveEmitter_x86_shared_h */