src/java.base/share/classes/jdk/internal/reflect/UnsafeStaticFieldAccessorImpl.java
author alanb
Wed, 19 Sep 2018 08:49:07 +0100
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parent 47216 71c04702a3d5
permissions -rw-r--r--
8210496: Improve filtering for classes with security sensitive fields Reviewed-by: plevart, mchung
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/*
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 * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.internal.reflect;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.security.AccessController;
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import java.util.Set;
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import jdk.internal.misc.Unsafe;
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/** Base class for jdk.internal.misc.Unsafe-based FieldAccessors for static
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    fields. The observation is that there are only nine types of
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    fields from the standpoint of reflection code: the eight primitive
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    types and Object. Using class Unsafe instead of generated
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    bytecodes saves memory and loading time for the
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    dynamically-generated FieldAccessors. */
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abstract class UnsafeStaticFieldAccessorImpl extends UnsafeFieldAccessorImpl {
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    static {
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        Reflection.registerFieldsToFilter(UnsafeStaticFieldAccessorImpl.class,
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                                          Set.of("base"));
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    }
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    protected final Object base; // base
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    UnsafeStaticFieldAccessorImpl(Field field) {
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        super(field);
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        base = unsafe.staticFieldBase(field);
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    }
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}