src/java.base/share/classes/jdk/internal/reflect/UnsafeStaticFieldAccessorImpl.java - master - githubmirror/jdk11u-dev

src/java.base/share/classes/jdk/internal/reflect/UnsafeStaticFieldAccessorImpl.java

52 строки2 KB

Erik Joelsson

8187443: Forest Consolidation: Move files to unified layout

12 сен 2017, 20:03

12 сен 2017, 20:033789983

/*
 * Copyright (c) 2001, 2012, 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.internal.reflect;

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

/** Base class for jdk.internal.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);
    }
}