js/src/jsapi-tests/testWindowNonConfigurable.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 "js/PropertyAndElement.h"  // JS_DefineProperty
   9 #include "js/Proxy.h"
  10 #include "jsapi-tests/tests.h"
  11
  12 class WindowProxyHandler : public js::ForwardingProxyHandler {
  13  public:
  14   constexpr WindowProxyHandler() : js::ForwardingProxyHandler(&family) {}
  15
  16   static const char family;
  17
  18   virtual bool defineProperty(JSContext* cx, JS::HandleObject proxy,
  19                               JS::HandleId id,
  20                               JS::Handle<JS::PropertyDescriptor> desc,
  21                               JS::ObjectOpResult& result) const override {
  22     if (desc.hasConfigurable() && !desc.configurable()) {
  23       result.failCantDefineWindowNonConfigurable();
  24       return true;
  25     }
  26     return ForwardingProxyHandler::defineProperty(cx, proxy, id, desc, result);
  27   }
  28 };
  29 const char WindowProxyHandler::family = 0;
  30
  31 static const JSClass windowProxy_class =
  32     PROXY_CLASS_DEF("TestWindowProxy", JSCLASS_HAS_RESERVED_SLOTS(1));
  33 static const WindowProxyHandler windowProxy_handler;
  34
  35 BEGIN_TEST(testWindowNonConfigurable) {
  36   JS::RootedObject wrapped(cx, JS_NewObject(cx, nullptr));
  37   CHECK(wrapped);
  38   JS::RootedValue wrappedVal(cx, JS::ObjectValue(*wrapped));
  39   js::ProxyOptions options;
  40   options.setClass(&windowProxy_class);
  41   JS::RootedObject obj(cx, NewProxyObject(cx, &windowProxy_handler, wrappedVal,
  42                                           nullptr, options));
  43   CHECK(obj);
  44   CHECK(JS_DefineProperty(cx, global, "windowProxy", obj, 0));
  45   JS::RootedValue v(cx);
  46   EVAL(
  47       "Object.defineProperty(windowProxy, 'bar', {value: 1, configurable: "
  48       "false})",
  49       &v);
  50   CHECK(v.isNull());  // This is the important bit!
  51   EVAL(
  52       "Object.defineProperty(windowProxy, 'bar', {value: 1, configurable: "
  53       "true})",
  54       &v);
  55   CHECK(&v.toObject() == obj);
  56   EVAL(
  57       "Reflect.defineProperty(windowProxy, 'foo', {value: 1, configurable: "
  58       "false})",
  59       &v);
  60   CHECK(v.isFalse());
  61   EVAL(
  62       "Reflect.defineProperty(windowProxy, 'foo', {value: 1, configurable: "
  63       "true})",
  64       &v);
  65   CHECK(v.isTrue());
  66
  67   return true;
  68 }
  69 END_TEST(testWindowNonConfigurable)