1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * JDK-8023368: Instance __proto__ property should exist and be writable. 26 * 27 * @test 28 * @run 29 */ 30 31 // function to force same callsites 32 function check(obj) { 33 print(obj.func()); 34 print(obj.x); 35 print(obj.toString()); 36 } 37 38 function Func() { 39 } 40 41 Func.prototype.func = function() { 42 return "Func.prototype.func"; 43 } 44 45 Func.prototype.x = "hello"; 46 47 var obj = new Func(); 48 var obj2 = Object.create(obj); 49 50 // check direct and indirect __proto__ change 51 check(obj); 52 check(obj2); 53 obj.__proto__ = { 54 func: function() { 55 return "obj.__proto__.func @ " + __LINE__; 56 }, 57 x: 344 58 }; 59 60 check(obj); 61 check(obj2); 62 63 // check indirect (1 and 2 levels) __proto__ function change 64 obj.__proto__.__proto__ = { 65 toString: function() { 66 return "new object.toString"; 67 } 68 }; 69 70 check(obj); 71 check(obj2);