hannesw@1548: /*
hannesw@1548:  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
hannesw@1548:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
hannesw@1548:  * 
hannesw@1548:  * This code is free software; you can redistribute it and/or modify it
hannesw@1548:  * under the terms of the GNU General Public License version 2 only, as
hannesw@1548:  * published by the Free Software Foundation.
hannesw@1548:  * 
hannesw@1548:  * This code is distributed in the hope that it will be useful, but WITHOUT
hannesw@1548:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
hannesw@1548:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
hannesw@1548:  * version 2 for more details (a copy is included in the LICENSE file that
hannesw@1548:  * accompanied this code).
hannesw@1548:  * 
hannesw@1548:  * You should have received a copy of the GNU General Public License version
hannesw@1548:  * 2 along with this work; if not, write to the Free Software Foundation,
hannesw@1548:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
hannesw@1548:  * 
hannesw@1548:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
hannesw@1548:  * or visit www.oracle.com if you need additional information or have any
hannesw@1548:  * questions.
hannesw@1548:  */
hannesw@1548: 
hannesw@1548: /**
hannesw@1548:  * JDK-8134609: Allow constructors with same prototoype map to share the allocator map
hannesw@1548:  *
hannesw@1548:  * @test
hannesw@1548:  * @run
hannesw@1548:  * @fork
hannesw@1548:  * @option -Dnashorn.debug
hannesw@1548:  */
hannesw@1548: 
hannesw@1548: function createProto(members) {
hannesw@1548:     function P() {
hannesw@1548:         for (var id in members) {
hannesw@1548:             if (members.hasOwnProperty(id)) {
hannesw@1548:                 this[id] = members[id];
hannesw@1548:             }
hannesw@1548:         }
hannesw@1548:         return this;
hannesw@1548:     }
hannesw@1548:     return new P();
hannesw@1548: }
hannesw@1548: 
hannesw@1548: function createSubclass(prototype, members) {
hannesw@1548:     function C() {
hannesw@1548:         for (var id in members) {
hannesw@1548:             if (members.hasOwnProperty(id)) {
hannesw@1548:                 this[id] = members[id];
hannesw@1548:             }
hannesw@1548:         }
hannesw@1548:         return this;
hannesw@1548:     }
hannesw@1548: 
hannesw@1548:     C.prototype = prototype;
hannesw@1548: 
hannesw@1548:     return new C();
hannesw@1548: }
hannesw@1548: 
hannesw@1548: function assertP1(object, value) {
hannesw@1548:     Assert.assertTrue(object.p1 === value);
hannesw@1548: }
hannesw@1548: 
hannesw@1548: // First prototype will have non-shared proto-map. Second and third will be shared.
hannesw@1548: var proto0 = createProto({p1: 0, p2: 1});
hannesw@1548: var proto1 = createProto({p1: 1, p2: 2});
hannesw@1548: var proto2 = createProto({p1: 2, p2: 3});
hannesw@1548: 
hannesw@1548: Assert.assertTrue(Debug.map(proto1) === Debug.map(proto2));
hannesw@1548: 
hannesw@1548: assertP1(proto1, 1);
hannesw@1548: assertP1(proto2, 2);
hannesw@1548: 
hannesw@1548: // First instantiation will have a non-shared prototype map, from the second one
hannesw@1548: // maps will be shared until a different proto map comes along.
hannesw@1548: var child0 = createSubclass(proto1, {c1: 1, c2: 2});
hannesw@1548: var child1 = createSubclass(proto2, {c1: 2, c2: 3});
hannesw@1548: var child2 = createSubclass(proto1, {c1: 3, c2: 4});
hannesw@1548: var child3 = createSubclass(proto2, {c1: 1, c2: 2});
hannesw@1548: var child4 = createSubclass(proto0, {c1: 3, c2: 2});
hannesw@1548: 
hannesw@1548: Assert.assertTrue(Debug.map(child1) === Debug.map(child2));
hannesw@1548: Assert.assertTrue(Debug.map(child1) === Debug.map(child3));
hannesw@1548: Assert.assertTrue(Debug.map(child3) !== Debug.map(child4));
hannesw@1548: 
hannesw@1548: assertP1(child1, 2);
hannesw@1548: assertP1(child2, 1);
hannesw@1548: assertP1(child3, 2);
hannesw@1548: assertP1(child4, 0);
hannesw@1548: 
hannesw@1548: Assert.assertTrue(delete proto2.p1);
hannesw@1548: 
hannesw@1548: assertP1(child3, undefined);
hannesw@1548: assertP1(child2, 1);
hannesw@1548: Assert.assertTrue(Debug.map(child1) !== Debug.map(child3));