js/src/frontend/JumpList.cpp
author Tooru Fujisawa <arai_a@mac.com>
Wed, 13 Mar 2019 04:29:44 +0000
changeset 521653 123ecc5c9586791c2ebae62c4a4e3cb600274975
parent 513561 731a43e841abcdb19ffc55151cb60c49cd8c0c84
permissions -rw-r--r--
Bug 1505343 - Part 1: Rename binsource => binast. r=Yoric Differential Revision: https://phabricator.services.mozilla.com/D23097

/* -*- 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/. */

#include "frontend/JumpList.h"

#include "vm/BytecodeUtil.h"

using namespace js;
using namespace js::frontend;

void JumpList::push(jsbytecode* code, ptrdiff_t jumpOffset) {
  SET_JUMP_OFFSET(&code[jumpOffset], offset - jumpOffset);
  offset = jumpOffset;
}

void JumpList::patchAll(jsbytecode* code, JumpTarget target) {
  ptrdiff_t delta;
  for (ptrdiff_t jumpOffset = offset; jumpOffset != -1; jumpOffset += delta) {
    jsbytecode* pc = &code[jumpOffset];
    MOZ_ASSERT(IsJumpOpcode(JSOp(*pc)));
    delta = GET_JUMP_OFFSET(pc);
    MOZ_ASSERT(delta < 0);
    ptrdiff_t span = target.offset - jumpOffset;
    SET_JUMP_OFFSET(pc, span);
  }
}