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);