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 TestUnsafeVolatileCAS

    30 {

    31     public volatile int f_int = 0;

    32     public volatile Integer f_obj = Integer.valueOf(0);

    33 

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

    35     public static Field f_int_field;

    36     public static Field f_obj_field;

    37     public static long f_int_off;

    38     public static long f_obj_off;

    39 

    40     static {

    41         try {

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

    43             f_obj_field = TestUnsafeVolatileCAS.class.getField("f_obj");

    44             f_int_off = unsafe.objectFieldOffset(f_int_field);

    45             f_obj_off = unsafe.objectFieldOffset(f_obj_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 TestUnsafeVolatileCAS t = new TestUnsafeVolatileCAS();

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

    56             t.f_int = -1;

    57             t.testInt(-1, i);

    58             if (t.f_int != i) {

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

    60             }

    61         }

    62         Integer minusOne = Integer.valueOf(-1);

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

    64             t.f_obj = minusOne;

    65             t.testObj(minusOne, Integer.valueOf(i));

    66             if (t.f_obj != i) {

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

    68             }

    69         }

    70     }

    71     public void testInt(int x, int i)

    72     {

    73         unsafe.compareAndSetInt(this, f_int_off, x, i);

    74     }

    75 

    76     public void testObj(Object x, Object o)

    77     {

    78         unsafe.compareAndSetObject(this, f_obj_off, x, o);

    79     }

    80 }