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 26package jdk.internal.reflect; 27 28import java.lang.reflect.Field; 29import java.lang.reflect.Modifier; 30import jdk.internal.misc.Unsafe; 31 32/** 33 * Base class for jdk.internal.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 43abstract 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} 53