Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 | // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. |
| 3 | // |
| 4 | // Redistribution and use in source and binary forms, with or without |
| 5 | // modification, are permitted provided that the following conditions |
| 6 | // are met: |
| 7 | // 1. Redistributions of source code must retain the above copyright |
| 8 | // notice, this list of conditions and the following disclaimer. |
| 9 | // 2. Redistributions in binary form must reproduce the above copyright |
| 10 | // notice, this list of conditions and the following disclaimer in the |
| 11 | // documentation and/or other materials provided with the distribution. |
| 12 | // |
| 13 | // THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| 14 | // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 15 | // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 16 | // DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| 17 | // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 18 | // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 19 | // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| 20 | // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 21 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 22 | // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 23 | |
| 24 | description( |
| 25 | "This test checks whether various seal/freeze/preventExtentions work on a regular object." |
| 26 | ); |
| 27 | |
| 28 | function obj() |
| 29 | { |
| 30 | // Add an accessor property to check 'isFrozen' returns the correct result for objects with accessors. |
| 31 | return Object.defineProperty({ a: 1, b: 2 }, 'g', { get: function() { return "getter"; } }); |
| 32 | } |
| 33 | |
| 34 | function test(obj) |
| 35 | { |
| 36 | obj.c =3; |
| 37 | obj.b =4; |
| 38 | delete obj.a; |
| 39 | |
| 40 | var result = ""; |
| 41 | for (key in obj) |
| 42 | result += ("(" + key + ":" + obj[key] + ")"); |
| 43 | if (Object.isSealed(obj)) |
| 44 | result += "S"; |
| 45 | if (Object.isFrozen(obj)) |
| 46 | result += "F"; |
| 47 | if (Object.isExtensible(obj)) |
| 48 | result += "E"; |
| 49 | return result; |
| 50 | } |
| 51 | |
| 52 | function seal(obj) |
| 53 | { |
| 54 | Object.seal(obj); |
| 55 | return obj; |
| 56 | } |
| 57 | |
| 58 | function freeze(obj) |
| 59 | { |
| 60 | Object.freeze(obj); |
| 61 | return obj; |
| 62 | } |
| 63 | |
| 64 | function preventExtensions(obj) |
| 65 | { |
| 66 | Object.preventExtensions(obj); |
| 67 | return obj; |
| 68 | } |
| 69 | |
| 70 | function inextensible(){} |
| 71 | function sealed(){} |
| 72 | function frozen(){}; |
| 73 | preventExtensions(inextensible); |
| 74 | seal(sealed); |
| 75 | freeze(frozen); |
| 76 | new inextensible; |
| 77 | new sealed; |
| 78 | new frozen; |
| 79 | inextensible.prototype.prototypeExists = true; |
| 80 | sealed.prototype.prototypeExists = true; |
| 81 | frozen.prototype.prototypeExists = true; |
| 82 | |
| 83 | shouldBeTrue("(new inextensible).prototypeExists"); |
| 84 | shouldBeTrue("(new sealed).prototypeExists"); |
| 85 | shouldBeTrue("(new frozen).prototypeExists"); |
| 86 | |
| 87 | shouldBe('test(obj())', '"(b:4)(c:3)E"'); // extensible, can delete a, can modify b, and can add c |
| 88 | shouldBe('test(preventExtensions(obj()))', '"(b:4)"'); // <nothing>, can delete a, can modify b, and CANNOT add c |
| 89 | shouldBe('test(seal(obj()))', '"(a:1)(b:4)S"'); // sealed, CANNOT delete a, can modify b, and CANNOT add c |
| 90 | shouldBe('test(freeze(obj()))', '"(a:1)(b:2)SF"'); // sealed and frozen, CANNOT delete a, CANNOT modify b, and CANNOT add c |
| 91 | |
| 92 | // check that we can preventExtensions on a host function. |
| 93 | shouldBe('Object.preventExtensions(Math.sin)', 'Math.sin'); |
| 94 | |
| 95 | shouldThrow('var o = {}; Object.preventExtensions(o); o.__proto__ = { newProp: "Should not see this" }; o.newProp;'); |
| 96 | shouldThrow('"use strict"; var o = {}; Object.preventExtensions(o); o.__proto__ = { newProp: "Should not see this" }; o.newProp;'); |
| 97 | |
| 98 | // check that we can still access static properties on an object after calling preventExtensions. |
| 99 | shouldBe('Object.preventExtensions(Math); Math.sqrt(4)', '2'); |
| 100 | |
| 101 | // Should not be able to add properties to a preventExtensions array. |
| 102 | shouldBeUndefined('var arr = Object.preventExtensions([]); arr[0] = 42; arr[0]'); |
| 103 | shouldBe('var arr = Object.preventExtensions([]); arr[0] = 42; arr.length', '0'); |
| 104 | // In strict mode, this throws. |
| 105 | shouldThrow('"use strict"; var arr = Object.preventExtensions([]); arr[0] = 42; arr[0]'); |
| 106 | |
| 107 | // A read-only property on the prototype should prevent a [[Put]] . |
| 108 | function Constructor() {} |
| 109 | Constructor.prototype.foo = 1; |
| 110 | Object.freeze(Constructor.prototype); |
| 111 | var obj = new Constructor(); |
| 112 | obj.foo = 2; |
| 113 | shouldBe('obj.foo', '1'); |
| 114 | |
| 115 | // Check that freezing a function works correctly. |
| 116 | var func = freeze(function foo(){}); |
| 117 | shouldBeTrue('Object.isFrozen(func)') |
| 118 | func.prototype = 42; |
| 119 | shouldBeFalse('func.prototype === 42'); |
| 120 | shouldBeFalse('Object.getOwnPropertyDescriptor(func, "prototype").writable') |
| 121 | |
| 122 | // Check that freezing a strict function works correctly. |
| 123 | var strictFunc = freeze(function foo(){ "use strict"; }); |
| 124 | shouldBeTrue('Object.isFrozen(strictFunc)') |
| 125 | strictFunc.prototype = 42; |
| 126 | shouldBeFalse('strictFunc.prototype === 42'); |
| 127 | shouldBeFalse('Object.getOwnPropertyDescriptor(strictFunc, "prototype").writable') |
| 128 | |
| 129 | // Check that freezing array objects works correctly. |
| 130 | var array = freeze([0,1,2]); |
| 131 | shouldBeTrue('Object.isFrozen(array)') |
| 132 | array[0] = 3; |
| 133 | shouldBe('array[0]', '0'); |
| 134 | shouldBeFalse('Object.getOwnPropertyDescriptor(array, "length").writable') |
| 135 | |
| 136 | // Check that freezing arguments objects works correctly. |
| 137 | var args = freeze((function(){ return arguments; })(0,1,2)); |
| 138 | shouldBeTrue('Object.isFrozen(args)') |
| 139 | args[0] = 3; |
| 140 | shouldBe('args[0]', '0'); |
| 141 | shouldBeFalse('Object.getOwnPropertyDescriptor(args, "length").writable') |
| 142 | shouldBeFalse('Object.getOwnPropertyDescriptor(args, "callee").writable') |
| 143 | |
| 144 | // Check that freeze still works if preventExtensions has been called on the object. |
| 145 | function preventExtensionsFreezeIsFrozen(x) |
| 146 | { |
| 147 | Object.preventExtensions(x); |
| 148 | Object.freeze(x); |
| 149 | return Object.isFrozen(x); |
| 150 | } |
| 151 | shouldBeTrue('preventExtensionsFreezeIsFrozen(function foo(){})') |
| 152 | shouldBeTrue('preventExtensionsFreezeIsFrozen(function foo(){ "use strict"; })') |
| 153 | shouldBeTrue('preventExtensionsFreezeIsFrozen([0,1,2])') |
| 154 | shouldBeTrue('preventExtensionsFreezeIsFrozen((function(){ return arguments; })(0,1,2))') |
| 155 | |
| 156 | shouldBeFalse('Object.getOwnPropertyDescriptor(freeze({0:0}), 0).configurable'); |
| 157 | shouldBeFalse('Object.getOwnPropertyDescriptor(freeze({10000001:0}), 10000001).configurable'); |