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/*
* 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.runtime.linker.Lookup.MH;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.util.Arrays;
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;
import jdk.nashorn.internal.runtime.linker.Lookup;
/**
* 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 nasgenmap$;
static {
PropertyMap map = PropertyMap.newMap(NativeStrictArguments.class);
map = Lookup.newProperty(map, "length", Property.NOT_ENUMERABLE, G$LENGTH, S$LENGTH);
// In strict mode, the caller and callee properties should throw TypeError
map = ScriptFunctionImpl.newThrowerProperty(map, "caller");
map = ScriptFunctionImpl.newThrowerProperty(map, "callee");
nasgenmap$ = map;
}
private Object length;
private final Object[] namedArgs;
NativeStrictArguments(final Object[] values, final int numParams) {
super(nasgenmap$);
setIsArguments();
final ScriptFunction func = ScriptFunctionImpl.getTypeErrorThrower();
// We have to fill user accessor functions late as these are stored
// in this object rather than in the PropertyMap of this object.
setUserAccessors("caller", func, func);
setUserAccessors("callee", func, func);
setArray(ArrayData.allocate(values));
this.length = values.length;
// extend/truncate named arg array as needed and copy values
this.namedArgs = new Object[numParams];
if (numParams > values.length) {
Arrays.fill(namedArgs, UNDEFINED);
}
System.arraycopy(values, 0, namedArgs, 0, Math.min(namedArgs.length, values.length));
this.setProto(Global.objectPrototype());
}
@Override
public String getClassName() {
return "Arguments";
}
/**
* getArgument is used for named argument access.
*/
@Override
public Object getArgument(final int key) {
return (key >=0 && key < namedArgs.length) ? namedArgs[key] : UNDEFINED;
}
/**
* setArgument is used for named argument set.
*/
@Override
public void setArgument(final int key, final Object value) {
if (key >= 0 && key < namedArgs.length) {
namedArgs[key] = value;
}
}
/**
* Length getter
* @param self self reference
* @return length property value
*/
public static Object G$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.publicLookup(), NativeStrictArguments.class, name, MH.type(rtype, types));
}
}
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