jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/runtime/StructureLoader.java@ec84ba68ad39

8019947: inherited property invalidation does not work with two globals in same context
Reviewed-by: jlaskey, lagergren, hannesw, attila

     1 /*

     2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package jdk.nashorn.internal.runtime;

    28 import static jdk.nashorn.internal.codegen.Compiler.SCRIPTS_PACKAGE;

    29 import static jdk.nashorn.internal.codegen.Compiler.binaryName;

    30 import static jdk.nashorn.internal.codegen.CompilerConstants.JS_OBJECT_PREFIX;

    32 import java.security.ProtectionDomain;

    33 import jdk.nashorn.internal.codegen.ObjectClassGenerator;

    35 /**

    36  * Responsible for on the fly construction of structure classes.

    37  *

    38  */

    39 final class StructureLoader extends NashornLoader {

    40     private static final String JS_OBJECT_PREFIX_EXTERNAL = binaryName(SCRIPTS_PACKAGE) + '.' + JS_OBJECT_PREFIX.symbolName();

    42     /**

    43      * Constructor.

    44      */

    45     StructureLoader(final ClassLoader parent, final Context context) {

    46         super(parent, context);

    47     }

    49     @Override

    50     protected synchronized Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {

    51         // check the cache first

    52         final Class<?> loadedClass = findLoadedClass(name);

    53         if (loadedClass != null) {

    54             if (resolve) {

    55                 resolveClass(loadedClass);

    56             }

    57             return loadedClass;

    58         }

    60         return super.loadClassTrusted(name, resolve);

    61     }

    63     @Override

    64     protected Class<?> findClass(final String name) throws ClassNotFoundException {

    65         if (name.startsWith(JS_OBJECT_PREFIX_EXTERNAL)) {

    66             return generateClass(name, name.substring(JS_OBJECT_PREFIX_EXTERNAL.length()));

    67         }

    68         return super.findClass(name);

    69     }

    71     /**

    72      * Generate a layout class.

    73      * @param name       Name of class.

    74      * @param descriptor Layout descriptor.

    75      * @return Generated class.

    76      */

    77     private Class<?> generateClass(final String name, final String descriptor) {

    78         Context context = getContext();

    80         if (context == null) {

    81             context = Context.getContextTrusted();

    82         }

    84         final byte[] code = new ObjectClassGenerator(context).generate(descriptor);

    85         return defineClass(name, code, 0, code.length, new ProtectionDomain(null, getPermissions(null)));

    86     }

    87 }

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