| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); |
| assertEquals("function", typeof desc.get); |
| assertEquals("function", typeof desc.set); |
| assertDoesNotThrow("desc.get.call({})"); |
| assertDoesNotThrow("desc.set.call({}, {})"); |
| |
| |
| var obj = {}; |
| var obj2 = {}; |
| desc.set.call(obj, obj2); |
| assertEquals(obj.__proto__, obj2); |
| assertEquals(desc.get.call(obj), obj2); |
| |
| |
| // Check that any redefinition of the __proto__ accessor works. |
| Object.defineProperty(Object.prototype, "__proto__", { |
| get: function() { |
| return 42; |
| } |
| }); |
| assertEquals({}.__proto__, 42); |
| assertEquals(desc.get.call({}), Object.prototype); |
| |
| |
| var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); |
| assertEquals(desc2.get.call({}), 42); |
| assertDoesNotThrow("desc2.set.call({})"); |
| |
| |
| Object.defineProperty(Object.prototype, "__proto__", { set:function(x){} }); |
| var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__"); |
| assertDoesNotThrow("desc3.get.call({})"); |
| assertDoesNotThrow("desc3.set.call({})"); |
| |
| |
| Object.defineProperty(Object.prototype, "__proto__", { set: undefined }); |
| assertThrows(function() { |
| "use strict"; |
| var o = {}; |
| var p = {}; |
| o.__proto__ = p; |
| }, TypeError); |
| |
| |
| assertTrue(delete Object.prototype.__proto__); |
| var o = {}; |
| var p = {}; |
| o.__proto__ = p; |
| assertEquals(Object.getPrototypeOf(o), Object.prototype); |
| var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__"); |
| assertTrue(desc4.configurable); |
| assertTrue(desc4.enumerable); |
| assertTrue(desc4.writable); |
| assertEquals(desc4.value, p); |