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 29 function test(expected, holder) { 30 assertEquals(expected, holder.property); 31 } 32 33 var holder = {} 34 holder.__proto__ = null; 35 holder.property = "foo"; 36 delete holder.property; 37 test(undefined, holder); 38 test(undefined, holder); 39 test(undefined, holder); 40 holder.property = "bar"; 41 test("bar", holder); 42 test("bar", holder); 43 44 // Now the same thing with a nontrivial prototype chain. 45 46 function test2(expected, holder) { 47 assertEquals(expected, holder.prop2); 48 } 49 50 var holder2 = {} 51 holder2.prop2 = "foo"; 52 holder2.__proto__ = null; 53 function Receiver() {} 54 Receiver.prototype = holder2; 55 56 var rec2 = new Receiver(); 57 delete holder2.prop2; 58 59 test2(undefined, rec2); 60 test2(undefined, rec2); 61 test2(undefined, rec2); 62 holder2.prop2 = "bar"; 63 test2("bar", rec2); 64 test2("bar", rec2); 65
