js/src/jsapi-tests/testAddPropertyPropcache.cpp
author Jon Coppeard <jcoppeard@mozilla.com>
Mon, 14 Jan 2019 11:02:35 +0000
changeset 453704 1cebf4f5c850ad22500a360c2742de3c9dd78c81
parent 448963 66eb1f485c1a3ea81372758bc92292c9428b17cd
permissions -rw-r--r--
Bug 1519397 - Factor GC locking RAII classes out of vm/Runtime.h r=pbone

/* -*- 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 "jsapi-tests/tests.h"

static int callCount = 0;

static bool AddProperty(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                        JS::HandleValue v) {
  callCount++;
  return true;
}

static const JSClassOps AddPropertyClassOps = {AddProperty};

static const JSClass AddPropertyClass = {"AddPropertyTester", 0,
                                         &AddPropertyClassOps};

BEGIN_TEST(testAddPropertyHook) {
  /*
   * Do the test a bunch of times, because sometimes we seem to randomly
   * miss the propcache.
   */
  static const int ExpectedCount = 100;

  JS::RootedObject obj(cx, JS_NewPlainObject(cx));
  CHECK(obj);
  JS::RootedValue proto(cx, JS::ObjectValue(*obj));
  JS_InitClass(cx, global, obj, &AddPropertyClass, nullptr, 0, nullptr, nullptr,
               nullptr, nullptr);

  obj = JS_NewArrayObject(cx, 0);
  CHECK(obj);
  JS::RootedValue arr(cx, JS::ObjectValue(*obj));

  CHECK(JS_DefineProperty(cx, global, "arr", arr, JSPROP_ENUMERATE));

  JS::RootedObject arrObj(cx, &arr.toObject());
  for (int i = 0; i < ExpectedCount; ++i) {
    obj = JS_NewObject(cx, &AddPropertyClass);
    CHECK(obj);
    CHECK(JS_DefineElement(cx, arrObj, i, obj, JSPROP_ENUMERATE));
  }

  // Now add a prop to each of the objects, but make sure to do
  // so at the same bytecode location so we can hit the propcache.
  EXEC(
      "'use strict';                                     \n"
      "for (var i = 0; i < arr.length; ++i)              \n"
      "  arr[i].prop = 42;                               \n");

  CHECK(callCount == ExpectedCount);

  return true;
}
END_TEST(testAddPropertyHook)