1 /* 2 * Copyright (c) 2015, 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-8134609: Allow constructors with same prototoype map to share the allocator map 26 * 27 * @test 28 * @run 29 * @fork 30 * @option -Dnashorn.debug 31 */ 32 33 function createProto(members) { 34 function P() { 35 for (var id in members) { 36 if (members.hasOwnProperty(id)) { 37 this[id] = members[id]; 38 } 39 } 40 return this; 41 } 42 return new P(); 43 } 44 45 function createSubclass(prototype, members) { 46 function C() { 47 for (var id in members) { 48 if (members.hasOwnProperty(id)) { 49 this[id] = members[id]; 50 } 51 } 52 return this; 53 } 54 55 C.prototype = prototype; 56 57 return new C(); 58 } 59 60 function assertP1(object, value) { 61 Assert.assertTrue(object.p1 === value); 62 } 63 64 // First prototype will have non-shared proto-map. Second and third will be shared. 65 var proto0 = createProto({p1: 0, p2: 1}); 66 var proto1 = createProto({p1: 1, p2: 2}); 67 var proto2 = createProto({p1: 2, p2: 3}); 68 69 Assert.assertTrue(Debug.map(proto1) === Debug.map(proto2)); 70 71 assertP1(proto1, 1); 72 assertP1(proto2, 2); 73 74 // First instantiation will have a non-shared prototype map, from the second one 75 // maps will be shared until a different proto map comes along. 76 var child0 = createSubclass(proto1, {c1: 1, c2: 2}); 77 var child1 = createSubclass(proto2, {c1: 2, c2: 3}); 78 var child2 = createSubclass(proto1, {c1: 3, c2: 4}); 79 var child3 = createSubclass(proto2, {c1: 1, c2: 2}); 80 var child4 = createSubclass(proto0, {c1: 3, c2: 2}); 81 82 Assert.assertTrue(Debug.map(child1) === Debug.map(child2)); 83 Assert.assertTrue(Debug.map(child1) === Debug.map(child3)); 84 Assert.assertTrue(Debug.map(child3) !== Debug.map(child4)); 85 86 assertP1(child1, 2); 87 assertP1(child2, 1); 88 assertP1(child3, 2); 89 assertP1(child4, 0); 90 91 Assert.assertTrue(delete proto2.p1); 92 93 assertP1(child3, undefined); 94 assertP1(child2, 1); 95 Assert.assertTrue(Debug.map(child1) !== Debug.map(child3));