1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28// Check baseline for __proto__. 29var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 30assertFalse(desc.enumerable); 31assertTrue(desc.configurable); 32assertEquals("function", typeof desc.get); 33assertEquals("function", typeof desc.set); 34 35// Check redefining getter for __proto__. 36function replaced_get() {}; 37Object.defineProperty(Object.prototype, "__proto__", { get:replaced_get }); 38desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 39assertFalse(desc.enumerable); 40assertTrue(desc.configurable); 41assertSame(replaced_get, desc.get); 42 43// Check redefining setter for __proto__. 44function replaced_set(x) {}; 45Object.defineProperty(Object.prototype, "__proto__", { set:replaced_set }); 46desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 47assertFalse(desc.enumerable); 48assertTrue(desc.configurable); 49assertSame(replaced_set, desc.set); 50 51// Check changing configurability of __proto__. 52Object.defineProperty(Object.prototype, "__proto__", { configurable:false }); 53desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 54assertFalse(desc.enumerable); 55assertFalse(desc.configurable); 56assertSame(replaced_get, desc.get); 57assertSame(replaced_set, desc.set); 58 59// Check freezing Object.prototype completely. 60Object.freeze(Object.prototype); 61assertTrue(Object.isFrozen(Object.prototype)); 62