jdk/src/java.base/share/classes/sun/reflect/UnsafeStaticFieldAccessorImpl.java
changeset 37377 bd3b98a11a14
parent 37376 5daa5fbad3ce
parent 37374 ee1b8619eddb
child 37380 55c2549714af
equal deleted inserted replaced
37376:5daa5fbad3ce 37377:bd3b98a11a14
     1 /*
       
     2  * Copyright (c) 2001, 2012, 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  */
       
    25 
       
    26 package sun.reflect;
       
    27 
       
    28 import java.lang.reflect.Field;
       
    29 import java.lang.reflect.Modifier;
       
    30 import java.security.AccessController;
       
    31 import jdk.internal.misc.Unsafe;
       
    32 
       
    33 /** Base class for jdk.internal.misc.Unsafe-based FieldAccessors for static
       
    34     fields. The observation is that there are only nine types of
       
    35     fields from the standpoint of reflection code: the eight primitive
       
    36     types and Object. Using class Unsafe instead of generated
       
    37     bytecodes saves memory and loading time for the
       
    38     dynamically-generated FieldAccessors. */
       
    39 
       
    40 abstract class UnsafeStaticFieldAccessorImpl extends UnsafeFieldAccessorImpl {
       
    41     static {
       
    42         Reflection.registerFieldsToFilter(UnsafeStaticFieldAccessorImpl.class,
       
    43                                           new String[] { "base" });
       
    44     }
       
    45 
       
    46     protected final Object base; // base
       
    47 
       
    48     UnsafeStaticFieldAccessorImpl(Field field) {
       
    49         super(field);
       
    50         base = unsafe.staticFieldBase(field);
       
    51     }
       
    52 }