1 // Copyright 2010 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 Object.freeze and Object.isFrozen methods - ES 15.2.3.9 and 29 // ES 15.2.3.12 30 31 32 // Test that we throw an error if an object is not passed as argument. 33 var non_objects = new Array(undefined, null, 1, -1, 0, 42.43); 34 for (var key in non_objects) { 35 try { 36 Object.freeze(non_objects[key]); 37 assertUnreachable(); 38 } catch(e) { 39 assertTrue(/Object.freeze called on non-object/.test(e)); 40 } 41 } 42 43 for (var key in non_objects) { 44 try { 45 Object.isFrozen(non_objects[key]); 46 assertUnreachable(); 47 } catch(e) { 48 assertTrue(/Object.isFrozen called on non-object/.test(e)); 49 } 50 } 51 52 // Test normal data properties. 53 var obj = { x: 42, z: 'foobar' }; 54 var desc = Object.getOwnPropertyDescriptor(obj, 'x'); 55 assertTrue(desc.writable); 56 assertTrue(desc.configurable); 57 assertEquals(42, desc.value); 58 59 desc = Object.getOwnPropertyDescriptor(obj, 'z'); 60 assertTrue(desc.writable); 61 assertTrue(desc.configurable); 62 assertEquals('foobar', desc.value); 63 64 assertTrue(Object.isExtensible(obj)); 65 assertFalse(Object.isFrozen(obj)); 66 67 Object.freeze(obj); 68 69 // Make sure we are no longer extensible. 70 assertFalse(Object.isExtensible(obj)); 71 assertTrue(Object.isFrozen(obj)); 72 73 obj.foo = 42; 74 assertEquals(obj.foo, undefined); 75 76 desc = Object.getOwnPropertyDescriptor(obj, 'x'); 77 assertFalse(desc.writable); 78 assertFalse(desc.configurable); 79 assertEquals(42, desc.value); 80 81 desc = Object.getOwnPropertyDescriptor(obj, 'z'); 82 assertFalse(desc.writable); 83 assertFalse(desc.configurable); 84 assertEquals("foobar", desc.value); 85 86 // Make sure that even if we try overwrite a value that is not writable, it is 87 // not changed. 88 obj.x = "tete"; 89 assertEquals(42, obj.x); 90 obj.x = { get: function() {return 43}, set: function() {} }; 91 assertEquals(42, obj.x); 92 93 // Test on accessors. 94 var obj2 = {}; 95 function get() { return 43; }; 96 function set() {}; 97 Object.defineProperty(obj2, 'x', { get: get, set: set, configurable: true }); 98 99 desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 100 assertTrue(desc.configurable); 101 assertEquals(undefined, desc.value); 102 assertEquals(set, desc.set); 103 assertEquals(get, desc.get); 104 105 assertTrue(Object.isExtensible(obj2)); 106 assertFalse(Object.isFrozen(obj2)); 107 Object.freeze(obj2); 108 assertTrue(Object.isFrozen(obj2)); 109 assertFalse(Object.isExtensible(obj2)); 110 111 desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 112 assertFalse(desc.configurable); 113 assertEquals(undefined, desc.value); 114 assertEquals(set, desc.set); 115 assertEquals(get, desc.get); 116 117 obj2.foo = 42; 118 assertEquals(obj2.foo, undefined); 119 120 121 // Test freeze on arrays. 122 var arr = new Array(42,43); 123 124 desc = Object.getOwnPropertyDescriptor(arr, '0'); 125 assertTrue(desc.configurable); 126 assertTrue(desc.writable); 127 assertEquals(42, desc.value); 128 129 desc = Object.getOwnPropertyDescriptor(arr, '1'); 130 assertTrue(desc.configurable); 131 assertTrue(desc.writable); 132 assertEquals(43, desc.value); 133 134 assertTrue(Object.isExtensible(arr)); 135 assertFalse(Object.isFrozen(arr)); 136 Object.freeze(arr); 137 assertTrue(Object.isFrozen(arr)); 138 assertFalse(Object.isExtensible(arr)); 139 140 desc = Object.getOwnPropertyDescriptor(arr, '0'); 141 assertFalse(desc.configurable); 142 assertFalse(desc.writable); 143 assertEquals(42, desc.value); 144 145 desc = Object.getOwnPropertyDescriptor(arr, '1'); 146 assertFalse(desc.configurable); 147 assertFalse(desc.writable); 148 assertEquals(43, desc.value); 149 150 arr[0] = 'foo'; 151 152 assertEquals(arr[0], 42); 153 154 155 // Test that isFrozen return the correct value even if configurable has been set 156 // to false on all properties manually and the extensible flag has also been set 157 // to false manually. 158 var obj3 = { x: 42, y: 'foo' }; 159 160 assertFalse(Object.isFrozen(obj3)); 161 162 Object.defineProperty(obj3, 'x', {configurable: false, writable: false}); 163 Object.defineProperty(obj3, 'y', {configurable: false, writable: false}); 164 Object.preventExtensions(obj3); 165 166 assertTrue(Object.isFrozen(obj3)); 167 168 169 // Make sure that an object that has only non-configurable, but one 170 // writable property, is not classified as frozen. 171 var obj4 = {}; 172 Object.defineProperty(obj4, 'x', {configurable: false, writable: true}); 173 Object.defineProperty(obj4, 'y', {configurable: false, writable: false}); 174 Object.preventExtensions(obj4); 175 176 assertFalse(Object.isFrozen(obj4)); 177 178 // Make sure that an object that has only non-writable, but one 179 // configurable property, is not classified as frozen. 180 var obj5 = {}; 181 Object.defineProperty(obj5, 'x', {configurable: true, writable: false}); 182 Object.defineProperty(obj5, 'y', {configurable: false, writable: false}); 183 Object.preventExtensions(obj5); 184 185 assertFalse(Object.isFrozen(obj5)); 186 187 // Make sure that Object.freeze returns the frozen object. 188 var obj6 = {} 189 assertTrue(obj6 === Object.freeze(obj6)) 190
