rev 12972 : 8140606: Update library code to use internal Unsafe
Reviewed-by: duke

   1 /*
   2  * Copyright (c) 2004, 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 sun.misc.Unsafe;
  31 
  32 /**
  33  * Base class for sun.misc.Unsafe-based FieldAccessors for fields with
  34  * final or volatile qualifiers. These differ from unqualified
  35  * versions in that (1) they check for read-only status (2) they use
  36  * the volatile forms of Unsafe get/put methods. (When accessed via
  37  * reflection, finals act as slightly "lighter" forms of volatiles. So
  38  * the volatile forms are heavier than necessary in terms of
  39  * underlying reordering rules and memory barriers, but preserve
  40  * correctness.)
  41  */
  42 
  43 abstract class UnsafeQualifiedFieldAccessorImpl
  44     extends UnsafeFieldAccessorImpl
  45 {
  46     protected final boolean isReadOnly;
  47 
  48     UnsafeQualifiedFieldAccessorImpl(Field field, boolean isReadOnly) {
  49         super(field);
  50         this.isReadOnly = isReadOnly;
  51     }
  52 }
--- EOF ---