| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.objects; |
| |
| import static jdk.nashorn.internal.lookup.Lookup.MH; |
| import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.util.ArrayList; |
| import jdk.nashorn.internal.runtime.AccessorProperty; |
| import jdk.nashorn.internal.runtime.GlobalFunctions; |
| import jdk.nashorn.internal.runtime.Property; |
| import jdk.nashorn.internal.runtime.PropertyMap; |
| import jdk.nashorn.internal.runtime.RecompilableScriptFunctionData; |
| import jdk.nashorn.internal.runtime.ScriptFunction; |
| import jdk.nashorn.internal.runtime.ScriptFunctionData; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| import jdk.nashorn.internal.runtime.Specialization; |
| |
| /** |
| * Concrete implementation of ScriptFunction. This sets correct map for the |
| * function objects -- to expose properties like "prototype", "length" etc. |
| */ |
| public class ScriptFunctionImpl extends ScriptFunction { |
| |
| /** Reference to constructor prototype. */ |
| private Object prototype; |
| |
| // property map for strict mode functions |
| private static final PropertyMap strictmodemap$; |
| // property map for bound functions |
| private static final PropertyMap boundfunctionmap$; |
| // property map for non-strict, non-bound functions. |
| private static final PropertyMap map$; |
| |
| // Marker object for lazily initialized prototype object |
| private static final Object LAZY_PROTOTYPE = new Object(); |
| |
| private ScriptFunctionImpl(final String name, final MethodHandle invokeHandle, final Specialization[] specs, final Global global) { |
| super(name, invokeHandle, map$, null, specs, ScriptFunctionData.IS_BUILTIN_CONSTRUCTOR); |
| init(global); |
| } |
| |
| /** |
| * Constructor called by Nasgen generated code, no membercount, use the default map. |
| * Creates builtin functions only. |
| * |
| * @param name name of function |
| * @param invokeHandle handle for invocation |
| * @param specs specialized versions of this method, if available, null otherwise |
| */ |
| ScriptFunctionImpl(final String name, final MethodHandle invokeHandle, final Specialization[] specs) { |
| this(name, invokeHandle, specs, Global.instance()); |
| } |
| |
| private ScriptFunctionImpl(final String name, final MethodHandle invokeHandle, final PropertyMap map, final Specialization[] specs, final Global global) { |
| super(name, invokeHandle, map.addAll(map$), null, specs, ScriptFunctionData.IS_BUILTIN_CONSTRUCTOR); |
| init(global); |
| } |
| |
| /** |
| * Constructor called by Nasgen generated code, no membercount, use the map passed as argument. |
| * Creates builtin functions only. |
| * |
| * @param name name of function |
| * @param invokeHandle handle for invocation |
| * @param map initial property map |
| * @param specs specialized versions of this method, if available, null otherwise |
| */ |
| ScriptFunctionImpl(final String name, final MethodHandle invokeHandle, final PropertyMap map, final Specialization[] specs) { |
| this(name, invokeHandle, map, specs, Global.instance()); |
| } |
| |
| private ScriptFunctionImpl(final String name, final MethodHandle methodHandle, final ScriptObject scope, final Specialization[] specs, final int flags, final Global global) { |
| super(name, methodHandle, getMap(isStrict(flags)), scope, specs, flags); |
| init(global); |
| } |
| |
| /** |
| * Constructor called by Global.newScriptFunction (runtime). |
| * |
| * @param name name of function |
| * @param methodHandle handle for invocation |
| * @param scope scope object |
| * @param specs specialized versions of this method, if available, null otherwise |
| * @param flags {@link ScriptFunctionData} flags |
| */ |
| ScriptFunctionImpl(final String name, final MethodHandle methodHandle, final ScriptObject scope, final Specialization[] specs, final int flags) { |
| this(name, methodHandle, scope, specs, flags, Global.instance()); |
| } |
| |
| private ScriptFunctionImpl(final RecompilableScriptFunctionData data, final ScriptObject scope, final Global global) { |
| super(data, getMap(data.isStrict()), scope); |
| init(global); |
| } |
| |
| /** |
| * Constructor called by (compiler) generated code for {@link ScriptObject}s. |
| * |
| * @param data static function data |
| * @param scope scope object |
| */ |
| public ScriptFunctionImpl(final RecompilableScriptFunctionData data, final ScriptObject scope) { |
| this(data, scope, Global.instance()); |
| } |
| |
| /** |
| * Only invoked internally from {@link BoundScriptFunctionImpl} constructor. |
| * @param data the script function data for the bound function. |
| * @param global the global object |
| */ |
| ScriptFunctionImpl(final ScriptFunctionData data, final Global global) { |
| super(data, boundfunctionmap$, null); |
| init(global); |
| } |
| |
| static { |
| final ArrayList<Property> properties = new ArrayList<>(3); |
| properties.add(AccessorProperty.create("prototype", Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE, G$PROTOTYPE, S$PROTOTYPE)); |
| properties.add(AccessorProperty.create("length", Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE | Property.NOT_WRITABLE, G$LENGTH, null)); |
| properties.add(AccessorProperty.create("name", Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE | Property.NOT_WRITABLE, G$NAME, null)); |
| map$ = PropertyMap.newMap(properties); |
| strictmodemap$ = createStrictModeMap(map$); |
| boundfunctionmap$ = createBoundFunctionMap(strictmodemap$); |
| } |
| |
| private static PropertyMap createStrictModeMap(final PropertyMap map) { |
| final int flags = Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE; |
| PropertyMap newMap = map; |
| // Need to add properties directly to map since slots are assigned speculatively by newUserAccessors. |
| newMap = newMap.addPropertyNoHistory(map.newUserAccessors("arguments", flags)); |
| newMap = newMap.addPropertyNoHistory(map.newUserAccessors("caller", flags)); |
| return newMap; |
| } |
| |
| private static boolean isStrict(final int flags) { |
| return (flags & ScriptFunctionData.IS_STRICT) != 0; |
| } |
| |
| // Choose the map based on strict mode! |
| private static PropertyMap getMap(final boolean strict) { |
| return strict ? strictmodemap$ : map$; |
| } |
| |
| private static PropertyMap createBoundFunctionMap(final PropertyMap strictModeMap) { |
| // Bound function map is same as strict function map, but additionally lacks the "prototype" property, see |
| // ECMAScript 5.1 section 15.3.4.5 |
| return strictModeMap.deleteProperty(strictModeMap.findProperty("prototype")); |
| } |
| |
| // Instance of this class is used as global anonymous function which |
| // serves as Function.prototype object. |
| private static class AnonymousFunction extends ScriptFunctionImpl { |
| private static final PropertyMap anonmap$ = PropertyMap.newMap(); |
| |
| AnonymousFunction() { |
| super("", GlobalFunctions.ANONYMOUS, anonmap$, null); |
| } |
| } |
| |
| static ScriptFunctionImpl newAnonymousFunction() { |
| return new AnonymousFunction(); |
| } |
| |
| private static ScriptFunction makeFunction(final String name, final MethodHandle methodHandle, final Specialization[] specs, final int flags) { |
| final ScriptFunctionImpl func = new ScriptFunctionImpl(name, methodHandle, null, specs, flags); |
| func.setPrototype(UNDEFINED); |
| // Non-constructor built-in functions do not have "prototype" property |
| func.deleteOwnProperty(func.getMap().findProperty("prototype")); |
| |
| return func; |
| } |
| |
| /** |
| * Factory method for non-constructor built-in functions |
| * |
| * @param name function name |
| * @param methodHandle handle for invocation |
| * @param specs specialized versions of function if available, null otherwise |
| * @return new ScriptFunction |
| */ |
| static ScriptFunction makeFunction(final String name, final MethodHandle methodHandle, final Specialization[] specs) { |
| return makeFunction(name, methodHandle, specs, ScriptFunctionData.IS_BUILTIN); |
| } |
| |
| /** |
| * Factory method for non-constructor built-in, strict functions |
| * |
| * @param name function name |
| * @param methodHandle handle for invocation |
| * @return new ScriptFunction |
| */ |
| static ScriptFunction makeStrictFunction(final String name, final MethodHandle methodHandle) { |
| return makeFunction(name, methodHandle, null, ScriptFunctionData.IS_BUILTIN | ScriptFunctionData.IS_STRICT ); |
| } |
| |
| /** |
| * Factory method for non-constructor built-in functions |
| * |
| * @param name function name |
| * @param methodHandle handle for invocation |
| * @return new ScriptFunction |
| */ |
| static ScriptFunction makeFunction(final String name, final MethodHandle methodHandle) { |
| return makeFunction(name, methodHandle, null); |
| } |
| |
| @Override |
| public ScriptFunction makeSynchronizedFunction(final Object sync) { |
| final MethodHandle mh = MH.insertArguments(ScriptFunction.INVOKE_SYNC, 0, this, sync); |
| return makeFunction(getName(), mh); |
| } |
| |
| /** |
| * Same as {@link ScriptFunction#makeBoundFunction(Object, Object[])}. The only reason we override it is so that we |
| * can expose it. |
| * @param self the self to bind to this function. Can be null (in which case, null is bound as this). |
| * @param args additional arguments to bind to this function. Can be null or empty to not bind additional arguments. |
| * @return a function with the specified self and parameters bound. |
| */ |
| @Override |
| public ScriptFunction makeBoundFunction(final Object self, final Object[] args) { |
| return super.makeBoundFunction(self, args); |
| } |
| |
| /** |
| * This method is used to create a bound function based on this function. |
| * |
| * @param data the {@code ScriptFunctionData} specifying the functions immutable portion. |
| * @return a function initialized from the specified data. Its parent scope will be set to null, therefore the |
| * passed in data should not expect a callee. |
| */ |
| @Override |
| protected ScriptFunction makeBoundFunction(final ScriptFunctionData data) { |
| return new BoundScriptFunctionImpl(data, getTargetFunction()); |
| } |
| |
| // return Object.prototype - used by "allocate" |
| @Override |
| protected final ScriptObject getObjectPrototype() { |
| return Global.objectPrototype(); |
| } |
| |
| @Override |
| public final Object getPrototype() { |
| if (prototype == LAZY_PROTOTYPE) { |
| prototype = new PrototypeObject(this); |
| } |
| return prototype; |
| } |
| |
| @Override |
| public final void setPrototype(final Object newProto) { |
| if (newProto instanceof ScriptObject && newProto != this.prototype && allocatorMap != null) { |
| // Replace our current allocator map with one that is associated with the new prototype. |
| allocatorMap = allocatorMap.changeProto((ScriptObject)newProto); |
| } |
| this.prototype = newProto; |
| } |
| |
| // Internals below.. |
| private void init(final Global global) { |
| this.setInitialProto(global.getFunctionPrototype()); |
| this.prototype = LAZY_PROTOTYPE; |
| |
| // We have to fill user accessor functions late as these are stored |
| // in this object rather than in the PropertyMap of this object. |
| assert objectSpill == null; |
| final ScriptFunction typeErrorThrower = global.getTypeErrorThrower(); |
| if (findProperty("arguments", true) != null) { |
| initUserAccessors("arguments", Property.NOT_CONFIGURABLE | Property.NOT_ENUMERABLE, typeErrorThrower, typeErrorThrower); |
| } |
| if (findProperty("caller", true) != null) { |
| initUserAccessors("caller", Property.NOT_CONFIGURABLE | Property.NOT_ENUMERABLE, typeErrorThrower, typeErrorThrower); |
| } |
| } |
| } |