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__. 29 var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 30 assertFalse(desc.enumerable); 31 assertTrue(desc.configurable); 32 assertEquals("function", typeof desc.get); 33 assertEquals("function", typeof desc.set); 34 35 // Check redefining getter for __proto__. 36 function replaced_get() {}; 37 Object.defineProperty(Object.prototype, "__proto__", { get:replaced_get }); 38 desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 39 assertFalse(desc.enumerable); 40 assertTrue(desc.configurable); 41 assertSame(replaced_get, desc.get); 42 43 // Check redefining setter for __proto__. 44 function replaced_set(x) {}; 45 Object.defineProperty(Object.prototype, "__proto__", { set:replaced_set }); 46 desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 47 assertFalse(desc.enumerable); 48 assertTrue(desc.configurable); 49 assertSame(replaced_set, desc.set); 50 51 // Check changing configurability of __proto__. 52 Object.defineProperty(Object.prototype, "__proto__", { configurable:false }); 53 desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); 54 assertFalse(desc.enumerable); 55 assertFalse(desc.configurable); 56 assertSame(replaced_get, desc.get); 57 assertSame(replaced_set, desc.set); 58 59 // Check freezing Object.prototype completely. 60 Object.freeze(Object.prototype); 61 assertTrue(Object.isFrozen(Object.prototype)); 62
