UnsafeStaticFieldAccessorImpl.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package sun.reflect;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.security.AccessController;
import sun.misc.Unsafe;

/** Base class for sun.misc.Unsafe-based FieldAccessors for static
    fields. The observation is that there are only nine types of
    fields from the standpoint of reflection code: the eight primitive
    types and Object. Using class Unsafe instead of generated
    bytecodes saves memory and loading time for the
    dynamically-generated FieldAccessors. */

abstract class UnsafeStaticFieldAccessorImpl extends UnsafeFieldAccessorImpl {
    static {
        Reflection.registerFieldsToFilter(UnsafeStaticFieldAccessorImpl.class,
                                          new String[] { "base" });
    }

    protected final Object base; // base

    UnsafeStaticFieldAccessorImpl(Field field) {
        super(field);
        base = unsafe.staticFieldBase(field);
    }
}