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 // check Object.setPrototypeOf extension rather than using __proto__
  32 
  33 // function to force same callsites
  34 function check(obj) {
  35     print(obj.func());
  36     print(obj.x);
  37     print(obj.toString());
  38 }
  39 
  40 function Func() {
  41 }
  42 
  43 Func.prototype.func = function() {
  44     return "Func.prototype.func";
  45 }
  46 
  47 Func.prototype.x = "hello";
  48 
  49 var obj = new Func();
  50 var obj2 = Object.create(obj);
  51 
  52 // check direct and indirect __proto__ change
  53 check(obj);
  54 check(obj2);
  55 Object.setPrototypeOf(obj, {
  56    func: function() {
  57         return "obj.__proto__.func @ " + __LINE__;
  58    },
  59    x: 344
  60 });
  61 
  62 check(obj);
  63 check(obj2);
  64 
  65 // check indirect (1 and 2 levels) __proto__ function change
  66 Object.setPrototypeOf(Object.getPrototypeOf(obj), {
  67     toString: function() {
  68         return "new object.toString";
  69     }
  70 });
  71 
  72 check(obj);
  73 check(obj2);