js/src/jsapi-tests/testForceLexicalInitialization.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include "jsfriendapi.h"
   9 #include "jsapi-tests/tests.h"
  10 #include "vm/EnvironmentObject.h"
  11
  12 BEGIN_TEST(testForceLexicalInitialization) {
  13   // Attach an uninitialized lexical to a scope and ensure that it's
  14   // set to undefined
  15   JS::Rooted<js::GlobalObject*> g(cx, cx->global());
  16   JS::Rooted<js::GlobalLexicalEnvironmentObject*> env(
  17       cx, js::GlobalLexicalEnvironmentObject::create(cx, g));
  18
  19   JS::RootedValue uninitialized(cx, JS::MagicValue(JS_UNINITIALIZED_LEXICAL));
  20   JS::Rooted<js::PropertyName*> name(cx,
  21                                      Atomize(cx, "foopi", 4)->asPropertyName());
  22   JS::RootedId id(cx, NameToId(name));
  23   unsigned attrs = JSPROP_ENUMERATE | JSPROP_PERMANENT;
  24
  25   CHECK(NativeDefineDataProperty(cx, env, id, uninitialized, attrs));
  26
  27   // Verify that "foopi" is uninitialized
  28   const JS::Value v = env->getSlot(env->lookup(cx, id)->slot());
  29   CHECK(v.isMagic(JS_UNINITIALIZED_LEXICAL));
  30
  31   ForceLexicalInitialization(cx, env);
  32
  33   // Verify that "foopi" has been initialized to undefined
  34   const JS::Value v2 = env->getSlot(env->lookup(cx, id)->slot());
  35   CHECK(v2.isUndefined());
  36
  37   return true;
  38 }
  39 END_TEST(testForceLexicalInitialization)