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);