testForceLexicalInitialization.cpp

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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/. */

#include "jsfriendapi.h"

#include "jsapi-tests/tests.h"

#include "vm/EnvironmentObject.h"

BEGIN_TEST(testForceLexicalInitialization) {

  // Attach an uninitialized lexical to a scope and ensure that it's

  // set to undefined

  JS::Rooted<js::GlobalObject*> g(cx, cx->global());

  JS::Rooted<js::GlobalLexicalEnvironmentObject*> env(

      cx, js::GlobalLexicalEnvironmentObject::create(cx, g));

  JS::RootedValue uninitialized(cx, JS::MagicValue(JS_UNINITIALIZED_LEXICAL));

  JS::Rooted<js::PropertyName*> name(cx,

                                     Atomize(cx, "foopi", 4)->asPropertyName());

  JS::RootedId id(cx, NameToId(name));

  unsigned attrs = JSPROP_ENUMERATE | JSPROP_PERMANENT;

  CHECK(NativeDefineDataProperty(cx, env, id, uninitialized, attrs));

  // Verify that "foopi" is uninitialized

  const JS::Value v = env->getSlot(env->lookup(cx, id)->slot());

  CHECK(v.isMagic(JS_UNINITIALIZED_LEXICAL));

  ForceLexicalInitialization(cx, env);

  // Verify that "foopi" has been initialized to undefined

  const JS::Value v2 = env->getSlot(env->lookup(cx, id)->slot());

  CHECK(v2.isUndefined());

  return true;

END_TEST(testForceLexicalInitialization)