| /* |
| * 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.runtime.ScriptRuntime.UNDEFINED; |
| import static jdk.nashorn.internal.lookup.Lookup.MH; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import jdk.nashorn.internal.runtime.AccessorProperty; |
| import jdk.nashorn.internal.runtime.Property; |
| import jdk.nashorn.internal.runtime.PropertyMap; |
| import jdk.nashorn.internal.runtime.ScriptFunction; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| import jdk.nashorn.internal.runtime.arrays.ArrayData; |
| |
| /** |
| * ECMA 10.6 Arguments Object. |
| * |
| * Arguments object for strict mode functions. |
| */ |
| public final class NativeStrictArguments extends ScriptObject { |
| |
| private static final MethodHandle G$LENGTH = findOwnMH("G$length", Object.class, Object.class); |
| |
| private static final MethodHandle S$LENGTH = findOwnMH("S$length", void.class, Object.class, Object.class); |
| |
| // property map for strict mode arguments object |
| private static final PropertyMap map$; |
| |
| static { |
| final ArrayList<Property> properties = new ArrayList<>(1); |
| properties.add(AccessorProperty.create("length", Property.NOT_ENUMERABLE, G$LENGTH, S$LENGTH)); |
| PropertyMap map = PropertyMap.newMap(properties); |
| // In strict mode, the caller and callee properties should throw TypeError |
| // Need to add properties directly to map since slots are assigned speculatively by newUserAccessors. |
| final int flags = Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE; |
| map = map.addPropertyNoHistory(map.newUserAccessors("caller", flags)); |
| map = map.addPropertyNoHistory(map.newUserAccessors("callee", flags)); |
| map$ = map; |
| } |
| |
| static PropertyMap getInitialMap() { |
| return map$; |
| } |
| |
| private Object length; |
| private final Object[] namedArgs; |
| |
| NativeStrictArguments(final Object[] values, final int numParams,final ScriptObject proto, final PropertyMap map) { |
| super(proto, map); |
| setIsArguments(); |
| |
| final ScriptFunction func = Global.instance().getTypeErrorThrower(); |
| // We have to fill user accessor functions late as these are stored |
| // in this object rather than in the PropertyMap of this object. |
| setUserAccessors("caller", func, func); |
| setUserAccessors("callee", func, func); |
| |
| setArray(ArrayData.allocate(values)); |
| this.length = values.length; |
| |
| // extend/truncate named arg array as needed and copy values |
| this.namedArgs = new Object[numParams]; |
| if (numParams > values.length) { |
| Arrays.fill(namedArgs, UNDEFINED); |
| } |
| System.arraycopy(values, 0, namedArgs, 0, Math.min(namedArgs.length, values.length)); |
| } |
| |
| @Override |
| public String getClassName() { |
| return "Arguments"; |
| } |
| |
| /** |
| * getArgument is used for named argument access. |
| */ |
| @Override |
| public Object getArgument(final int key) { |
| return (key >=0 && key < namedArgs.length) ? namedArgs[key] : UNDEFINED; |
| } |
| |
| /** |
| * setArgument is used for named argument set. |
| */ |
| @Override |
| public void setArgument(final int key, final Object value) { |
| if (key >= 0 && key < namedArgs.length) { |
| namedArgs[key] = value; |
| } |
| } |
| |
| /** |
| * Length getter |
| * @param self self reference |
| * @return length property value |
| */ |
| public static Object G$length(final Object self) { |
| if (self instanceof NativeStrictArguments) { |
| return ((NativeStrictArguments)self).getArgumentsLength(); |
| } |
| return 0; |
| } |
| |
| /** |
| * Length setter |
| * @param self self reference |
| * @param value value for length property |
| */ |
| public static void S$length(final Object self, final Object value) { |
| if (self instanceof NativeStrictArguments) { |
| ((NativeStrictArguments)self).setArgumentsLength(value); |
| } |
| } |
| |
| private Object getArgumentsLength() { |
| return length; |
| } |
| |
| private void setArgumentsLength(final Object length) { |
| this.length = length; |
| } |
| |
| private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) { |
| return MH.findStatic(MethodHandles.lookup(), NativeStrictArguments.class, name, MH.type(rtype, types)); |
| } |
| } |