1 /*

     2  * Copyright (c) 2012, 2018, 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 

    25 package org.graalvm.compiler.core.common.util;

    26 

    27 import java.lang.reflect.Field;

    28 

    29 import sun.misc.Unsafe;

    30 

    31 /**

    32  * Package private access to the {@link Unsafe} capability.

    33  */

    34 class UnsafeAccess {

    35 

    36     static final Unsafe UNSAFE = initUnsafe();

    37 

    38     private static Unsafe initUnsafe() {

    39         try {

    40             // Fast path when we are trusted.

    41             return Unsafe.getUnsafe();

    42         } catch (SecurityException se) {

    43             // Slow path when we are not trusted.

    44             try {

    45                 Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");

    46                 theUnsafe.setAccessible(true);

    47                 return (Unsafe) theUnsafe.get(Unsafe.class);

    48             } catch (Exception e) {

    49                 throw new RuntimeException("exception while trying to get Unsafe", e);

    50             }

    51         }

    52     }

    53 }