1// Copyright 2008 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
28function A() { }
29function B() { }
30function C() { }
31
32function NewC() {
33  A.prototype = {};
34  B.prototype = new A();
35  C.prototype = new B();
36  var result = new C();
37  result.A = A.prototype;
38  result.B = B.prototype;
39  result.C = C.prototype;
40  return result;
41}
42
43// Check that we can read properties defined in prototypes.
44var c = NewC();
45c.A.x = 1;
46c.B.y = 2;
47c.C.z = 3;
48assertEquals(1, c.x);
49assertEquals(2, c.y);
50assertEquals(3, c.z);
51
52var c = NewC();
53c.A.x = 0;
54for (var i = 0; i < 2; i++) {
55  assertEquals(i, c.x);
56  c.B.x = 1;
57}
58
59
60// Regression test:
61// Make sure we preserve the prototype of an object in the face of map transitions.
62
63function D() {
64  this.d = 1;
65}
66var p = new Object();
67p.y = 1;
68new D();
69
70D.prototype = p
71assertEquals(1, (new D).y);
72
73
74// Regression test:
75// Make sure that arrays and functions in the prototype chain works;
76// check length.
77function X() { }
78function Y() { }
79
80X.prototype = function(a,b) { };
81Y.prototype = [1,2,3];
82
83assertEquals(2, (new X).length);
84assertEquals(3, (new Y).length);
85
86
87// Test setting the length of an object where the prototype is from an array.
88var test = new Object;
89test.__proto__ = (new Array()).__proto__;
90test.length = 14;
91assertEquals(14, test.length);
92