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 93 94