ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1 | // Copyright 2008 the V8 project authors. All rights reserved. |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 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 | |
| 28 | function A() { } |
| 29 | function B() { } |
| 30 | function C() { } |
| 31 | |
| 32 | function 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. |
| 44 | var c = NewC(); |
| 45 | c.A.x = 1; |
| 46 | c.B.y = 2; |
| 47 | c.C.z = 3; |
| 48 | assertEquals(1, c.x); |
| 49 | assertEquals(2, c.y); |
| 50 | assertEquals(3, c.z); |
| 51 | |
| 52 | var c = NewC(); |
| 53 | c.A.x = 0; |
| 54 | for (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 | |
| 63 | function D() { |
| 64 | this.d = 1; |
| 65 | } |
| 66 | var p = new Object(); |
| 67 | p.y = 1; |
| 68 | new D(); |
| 69 | |
| 70 | D.prototype = p |
| 71 | assertEquals(1, (new D).y); |
| 72 | |
| 73 | |
| 74 | // Regression test: |
| 75 | // Make sure that arrays and functions in the prototype chain works; |
| 76 | // check length. |
| 77 | function X() { } |
| 78 | function Y() { } |
| 79 | |
| 80 | X.prototype = function(a,b) { }; |
| 81 | Y.prototype = [1,2,3]; |
| 82 | |
| 83 | assertEquals(2, (new X).length); |
| 84 | assertEquals(3, (new Y).length); |
| 85 | |
| 86 | |
| 87 | // Test setting the length of an object where the prototype is from an array. |
| 88 | var test = new Object; |
| 89 | test.__proto__ = (new Array()).__proto__; |
| 90 | test.length = 14; |
| 91 | assertEquals(14, test.length); |