1 /*

     2  * Copyright (c) 2016, 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.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 package jdk.test.lib.unsafe;

    25 

    26 import jdk.internal.misc.Unsafe;

    27 import java.lang.reflect.Field;

    28 

    29 

    30 /**

    31  * Helper class for accessing the jdk.internal.misc.Unsafe functionality

    32  */

    33 public final class UnsafeHelper {

    34     private static Unsafe unsafe = null;

    35 

    36     /**

    37      * @return Unsafe instance.

    38      */

    39     public static synchronized Unsafe getUnsafe() {

    40         if (unsafe == null) {

    41             try {

    42                 Field f = Unsafe.class.getDeclaredField("theUnsafe");

    43                 f.setAccessible(true);

    44                 unsafe = (Unsafe) f.get(null);

    45             } catch (NoSuchFieldException | IllegalAccessException e) {

    46                 throw new RuntimeException("Unable to get Unsafe instance.", e);

    47             }

    48         }

    49         return unsafe;

    50     }

    51 }

    52