1// Copyright 2011 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
28var e = new Error();
29assertFalse(e.hasOwnProperty('message'));
30Error.prototype.toString = Object.prototype.toString;
31assertEquals("[object Error]", Error.prototype.toString());
32assertEquals(Object.prototype, Error.prototype.__proto__);
33
34// Check that error construction does not call setters for the
35// properties on error objects in prototypes.
36function fail() { assertTrue(false); };
37ReferenceError.prototype.__defineSetter__('stack', fail);
38ReferenceError.prototype.__defineSetter__('message', fail);
39ReferenceError.prototype.__defineSetter__('type', fail);
40ReferenceError.prototype.__defineSetter__('arguments', fail);
41var e0 = new ReferenceError();
42var e1 = new ReferenceError('123');
43assertTrue(e1.hasOwnProperty('message'));
44assertTrue(e0.hasOwnProperty('stack'));
45assertTrue(e1.hasOwnProperty('stack'));
46assertTrue(e0.hasOwnProperty('type'));
47assertTrue(e1.hasOwnProperty('type'));
48assertTrue(e0.hasOwnProperty('arguments'));
49assertTrue(e1.hasOwnProperty('arguments'));
50
51// Check that the name property on error prototypes is read-only and
52// dont-delete. This is not specified, but allowing overwriting the
53// name property with a getter can leaks error objects from different
54// script tags in the same context in a browser setting. We therefore
55// disallow changes to the name property on error objects.
56assertEquals("ReferenceError", ReferenceError.prototype.name);
57delete ReferenceError.prototype.name;
58assertEquals("ReferenceError", ReferenceError.prototype.name);
59ReferenceError.prototype.name = "not a reference error";
60assertEquals("ReferenceError", ReferenceError.prototype.name);
61
62// Check that message and name are not enumerable on Error objects.
63var desc = Object.getOwnPropertyDescriptor(Error.prototype, 'name');
64assertFalse(desc['enumerable']);
65desc = Object.getOwnPropertyDescriptor(Error.prototype, 'message');
66assertFalse(desc['enumerable']);
67
68var e = new Error("foobar");
69desc = Object.getOwnPropertyDescriptor(e, 'message');
70assertFalse(desc['enumerable']);
71desc = Object.getOwnPropertyDescriptor(e, 'arguments');
72assertFalse(desc['enumerable']);
73desc = Object.getOwnPropertyDescriptor(e, 'type');
74assertFalse(desc['enumerable']);
75desc = Object.getOwnPropertyDescriptor(e, 'stack');
76assertFalse(desc['enumerable']);
77
78// name is not tested above, but in addition we should have no enumerable
79// properties, so we simply assert that.
80for (var v in e) {
81  assertUnreachable();
82}
83