Mercurial > jdk8-mips64-public > nashorn / file revision

 /*

  * 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.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.lookup.Lookup;

 import jdk.nashorn.internal.lookup.MethodHandleFactory;

 /**

  * 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 {

         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

         // 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.addProperty(map.newUserAccessors("caller", flags));

         map = map.addProperty(map.newUserAccessors("callee", flags));

         map$ = map;

     }

     private Object   length;

     private final Object[] namedArgs;

     NativeStrictArguments(final ScriptObject proto, final Object[] values, final int numParams) {

         super(proto, map$);

         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));

     }

     @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) {

         try {

             return MethodHandles.lookup().findStatic(NativeStrictArguments.class, name, MH.type(rtype, types));

         } catch (final NoSuchMethodException | IllegalAccessException e) {

             throw new MethodHandleFactory.LookupException(e);

         }

     }

 }