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src/jdk/nashorn/internal/objects/PrototypeObject.java@edca88d3a03e (annotated)

src/jdk/nashorn/internal/objects/PrototypeObject.java

Fri, 05 Jul 2013 14:36:54 +0200

author

hannesw

date

Fri, 05 Jul 2013 14:36:54 +0200

changeset 415

edca88d3a03e

parent 414

ec84ba68ad39

child 418

36d6b6a3fbe0

permissions

-rw-r--r--

8017084: Use spill properties for large object literals
Reviewed-by: lagergren, sundar

jlaskey@3	1	/*
jlaskey@7	2	* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
jlaskey@3	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jlaskey@3	4	*
jlaskey@3	5	* This code is free software; you can redistribute it and/or modify it
jlaskey@3	6	* under the terms of the GNU General Public License version 2 only, as
jlaskey@3	7	* published by the Free Software Foundation. Oracle designates this
jlaskey@3	8	* particular file as subject to the "Classpath" exception as provided
jlaskey@3	9	* by Oracle in the LICENSE file that accompanied this code.
jlaskey@3	10	*
jlaskey@3	11	* This code is distributed in the hope that it will be useful, but WITHOUT
jlaskey@3	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jlaskey@3	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
jlaskey@3	14	* version 2 for more details (a copy is included in the LICENSE file that
jlaskey@3	15	* accompanied this code).
jlaskey@3	16	*
jlaskey@3	17	* You should have received a copy of the GNU General Public License version
jlaskey@3	18	* 2 along with this work; if not, write to the Free Software Foundation,
jlaskey@3	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jlaskey@3	20	*
jlaskey@3	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jlaskey@3	22	* or visit www.oracle.com if you need additional information or have any
jlaskey@3	23	* questions.
jlaskey@3	24	*/
jlaskey@3	25
jlaskey@3	26	package jdk.nashorn.internal.objects;
jlaskey@3	27
jlaskey@3	28	import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
sundar@133	29	import static jdk.nashorn.internal.lookup.Lookup.MH;
jlaskey@3	30
jlaskey@3	31	import java.lang.invoke.MethodHandle;
jlaskey@3	32	import java.lang.invoke.MethodHandles;
jlaskey@3	33	import jdk.nashorn.internal.runtime.Property;
jlaskey@3	34	import jdk.nashorn.internal.runtime.PropertyMap;
jlaskey@3	35	import jdk.nashorn.internal.runtime.ScriptFunction;
jlaskey@3	36	import jdk.nashorn.internal.runtime.ScriptObject;
sundar@133	37	import jdk.nashorn.internal.lookup.Lookup;
sundar@372	38	import jdk.nashorn.internal.lookup.MethodHandleFactory;
jlaskey@3	39
jlaskey@3	40	/**
jlaskey@3	41	* Instances of this class serve as "prototype" object for script functions.
jlaskey@3	42	* The purpose is to expose "constructor" property from "prototype". Also, nasgen
jlaskey@3	43	* generated prototype classes extend from this class.
jlaskey@3	44	*
jlaskey@3	45	*/
jlaskey@3	46	public class PrototypeObject extends ScriptObject {
hannesw@380	47	private static final PropertyMap map$;
jlaskey@3	48
jlaskey@3	49	private Object constructor;
jlaskey@3	50
jlaskey@3	51	private static final MethodHandle GET_CONSTRUCTOR = findOwnMH("getConstructor", Object.class, Object.class);
jlaskey@3	52	private static final MethodHandle SET_CONSTRUCTOR = findOwnMH("setConstructor", void.class, Object.class, Object.class);
jlaskey@3	53
jlaskey@3	54	static {
hannesw@415	55	PropertyMap map = PropertyMap.newMap();
jlaskey@3	56	map = Lookup.newProperty(map, "constructor", Property.NOT_ENUMERABLE, GET_CONSTRUCTOR, SET_CONSTRUCTOR);
hannesw@380	57	map$ = map;
jlaskey@3	58	}
jlaskey@3	59
sundar@414	60	static PropertyMap getInitialMap() {
sundar@414	61	return map$;
sundar@414	62	}
sundar@414	63
sundar@414	64	private PrototypeObject(final Global global, final PropertyMap map) {
sundar@414	65	super(map != map$? map.addAll(global.getPrototypeObjectMap()) : global.getPrototypeObjectMap());
sundar@414	66	setProto(global.getObjectPrototype());
sundar@414	67	}
sundar@414	68
jlaskey@3	69	PrototypeObject() {
sundar@414	70	this(Global.instance(), map$);
jlaskey@3	71	}
jlaskey@3	72
jlaskey@3	73	/**
jlaskey@3	74	* PropertyObject constructor
jlaskey@3	75	*
jlaskey@3	76	* @param map property map
jlaskey@3	77	*/
jlaskey@3	78	public PrototypeObject(final PropertyMap map) {
sundar@414	79	this(Global.instance(), map);
jlaskey@3	80	}
jlaskey@3	81
jlaskey@3	82	PrototypeObject(final ScriptFunction func) {
sundar@414	83	this(Global.instance(), map$);
jlaskey@3	84	this.constructor = func;
jlaskey@3	85	}
jlaskey@3	86
jlaskey@3	87	/**
jlaskey@3	88	* Get the constructor for this {@code PrototypeObject}
jlaskey@3	89	* @param self self reference
jlaskey@3	90	* @return constructor, probably, but not necessarily, a {@link ScriptFunction}
jlaskey@3	91	*/
jlaskey@3	92	public static Object getConstructor(final Object self) {
jlaskey@3	93	return (self instanceof PrototypeObject) ?
jlaskey@3	94	((PrototypeObject)self).getConstructor() :
jlaskey@3	95	UNDEFINED;
jlaskey@3	96	}
jlaskey@3	97
jlaskey@3	98	/**
jlaskey@3	99	* Reset the constructor for this {@code PrototypeObject}
jlaskey@3	100	* @param self self reference
jlaskey@3	101	* @param constructor constructor, probably, but not necessarily, a {@link ScriptFunction}
jlaskey@3	102	*/
jlaskey@3	103	public static void setConstructor(final Object self, final Object constructor) {
jlaskey@3	104	if (self instanceof PrototypeObject) {
jlaskey@3	105	((PrototypeObject)self).setConstructor(constructor);
jlaskey@3	106	}
jlaskey@3	107	}
jlaskey@3	108
jlaskey@3	109	private Object getConstructor() {
jlaskey@3	110	return constructor;
jlaskey@3	111	}
jlaskey@3	112
jlaskey@3	113	private void setConstructor(final Object constructor) {
jlaskey@3	114	this.constructor = constructor;
jlaskey@3	115	}
jlaskey@3	116
jlaskey@3	117	private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) {
sundar@414	118	return MH.findStatic(MethodHandles.lookup(), PrototypeObject.class, name, MH.type(rtype, types));
jlaskey@3	119	}
jlaskey@3	120	}