1 /*

     2  * Copyright (c) 2018, Red Hat, Inc. 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 compiler.c2.aarch64;

    25 

    26 import java.lang.reflect.Field;

    27 import jdk.internal.misc.Unsafe;

    28 

    29 class TestUnsafeVolatileGAA

    30 {

    31     public volatile int f_int = -1;

    32     public volatile long f_long = -1;

    33 

    34     public static Unsafe unsafe = Unsafe.getUnsafe();

    35     public static Field f_int_field;

    36     public static Field f_long_field;

    37     public static long f_int_off;

    38     public static long f_long_off;

    39 

    40     static {

    41         try {

    42             f_int_field = TestUnsafeVolatileGAA.class.getField("f_int");

    43             f_long_field = TestUnsafeVolatileGAA.class.getField("f_long");

    44             f_int_off = unsafe.objectFieldOffset(f_int_field);

    45             f_long_off = unsafe.objectFieldOffset(f_long_field);

    46         } catch (Exception e) {

    47             System.out.println("reflection failed " + e);

    48             e.printStackTrace();

    49         }

    50     }

    51 

    52     public static void main(String[] args)

    53     {

    54         final TestUnsafeVolatileGAA t = new TestUnsafeVolatileGAA();

    55         for (int i = 0; i < 100_000; i++) {

    56             if (t.testInt() != i-1) {

    57                 throw new RuntimeException("bad result!");

    58             }

    59         }

    60         for (int i = 0; i < 100_000; i++) {

    61             if (t.testLong() != i-1) {

    62                 throw new RuntimeException("bad result!");

    63             }

    64         }

    65     }

    66 

    67     public int testInt()

    68     {

    69         return unsafe.getAndAddInt(this, f_int_off, 1);

    70     }

    71 

    72     public long testLong()

    73     {

    74         return unsafe.getAndAddLong(this, f_long_off, 1);

    75     }

    76 }