1// Copyright 2010-2015 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// Tests the Reflect.preventExtensions method - ES6 26.1.12. 29// This is adapted from object-prevent-extensions.js. 30 31// Flags: --allow-natives-syntax --harmony-reflect 32 33 34var obj1 = {}; 35// Extensible defaults to true. 36assertTrue(Object.isExtensible(obj1)); 37assertTrue(Reflect.preventExtensions(obj1)); 38 39// Make sure the is_extensible flag is set. 40assertFalse(Object.isExtensible(obj1)); 41obj1.x = 42; 42assertEquals(undefined, obj1.x); 43 44// Try adding a new element. 45obj1[1] = 42; 46assertEquals(undefined, obj1[1]); 47 48 49// Try when the object has an existing property. 50var obj2 = {}; 51assertTrue(Object.isExtensible(obj2)); 52obj2.x = 42; 53assertEquals(42, obj2.x); 54assertTrue(Object.isExtensible(obj2)); 55 56assertTrue(Reflect.preventExtensions(obj2)); 57assertEquals(42, obj2.x); 58 59obj2.y = 42; 60// obj2.y should still be undefined. 61assertEquals(undefined, obj2.y); 62// Make sure we can still write values to obj.x. 63obj2.x = 43; 64assertEquals(43, obj2.x) 65 66obj2.y = new function() { return 42; }; 67// obj2.y should still be undefined. 68assertEquals(undefined, obj2.y); 69assertEquals(43, obj2.x) 70 71try { 72 Object.defineProperty(obj2, "y", {value: 42}); 73} catch (e) { 74 assertTrue(/object is not extensible/.test(e)); 75} 76 77// obj2.y should still be undefined. 78assertEquals(undefined, obj2.y); 79assertEquals(43, obj2.x); 80 81obj2[1] = 42; 82assertEquals(undefined, obj2[1]); 83 84var arr = new Array(); 85arr[1] = 10; 86 87assertTrue(Reflect.preventExtensions(arr)); 88 89arr[2] = 42; 90assertEquals(10, arr[1]); 91 92// We should still be able to change existing elements. 93arr[1]= 42; 94assertEquals(42, arr[1]); 95 96 97// Test the the extensible flag is not inherited. 98var parent = {}; 99parent.x = 42; 100assertTrue(Reflect.preventExtensions(parent)); 101 102var child = Object.create(parent); 103 104// We should be able to add new properties to the child object. 105child.y = 42; 106 107// This should have no influence on the parent class. 108parent.y = 29; 109 110 111// Test that attributes on functions are also handled correctly. 112function foo() { 113 return 42; 114} 115 116assertTrue(Reflect.preventExtensions(foo)); 117 118foo.x = 29; 119assertEquals(undefined, foo.x); 120 121// when Object.isExtensible(o) === false 122// assignment should return right hand side value 123var o = {}; 124assertTrue(Reflect.preventExtensions(o)); 125var v = o.v = 50; 126assertEquals(undefined, o.v); 127assertEquals(50, v); 128 129// test same behavior as above, but for integer properties 130var n = o[0] = 100; 131assertEquals(undefined, o[0]); 132assertEquals(100, n); 133 134// Fast properties should remain fast 135obj = { x: 42, y: 'foo' }; 136assertTrue(%HasFastProperties(obj)); 137assertTrue(Reflect.preventExtensions(obj)); 138assertFalse(Object.isExtensible(obj)); 139assertFalse(Object.isSealed(obj)); 140assertTrue(%HasFastProperties(obj)); 141 142// Non-extensible objects should share maps where possible 143obj = { prop1: 1, prop2: 2 }; 144obj2 = { prop1: 3, prop2: 4 }; 145assertTrue(%HaveSameMap(obj, obj2)); 146assertTrue(Reflect.preventExtensions(obj)); 147assertTrue(Reflect.preventExtensions(obj2)); 148assertFalse(Object.isExtensible(obj)); 149assertFalse(Object.isExtensible(obj2)); 150assertFalse(Object.isSealed(obj)); 151assertFalse(Object.isSealed(obj2)); 152assertTrue(%HaveSameMap(obj, obj2)); 153 154// Non-extensible objects should share maps even when they have elements 155obj = { prop1: 1, prop2: 2, 75: 'foo' }; 156obj2 = { prop1: 3, prop2: 4, 150: 'bar' }; 157assertTrue(%HaveSameMap(obj, obj2)); 158assertTrue(Reflect.preventExtensions(obj)); 159assertTrue(Reflect.preventExtensions(obj2)); 160assertFalse(Object.isExtensible(obj)); 161assertFalse(Object.isExtensible(obj2)); 162assertFalse(Object.isSealed(obj)); 163assertFalse(Object.isSealed(obj2)); 164assertTrue(%HaveSameMap(obj, obj2)); 165