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 TestUnsafeVolatileGAS

    30 {

    31     public volatile int f_int = -1;

    32     public volatile Integer f_obj = Integer.valueOf(-1);

    33     public volatile long f_long = -1;

    34 

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

    36     public static Field f_int_field;

    37     public static Field f_obj_field;

    38     public static Field f_long_field;

    39     public static long f_int_off;

    40     public static long f_obj_off;

    41     public static long f_long_off;

    42 

    43     static {

    44         try {

    45             f_int_field = TestUnsafeVolatileGAS.class.getField("f_int");

    46             f_obj_field = TestUnsafeVolatileGAS.class.getField("f_obj");

    47             f_long_field = TestUnsafeVolatileGAS.class.getField("f_long");

    48             f_int_off = unsafe.objectFieldOffset(f_int_field);

    49             f_obj_off = unsafe.objectFieldOffset(f_obj_field);

    50             f_long_off = unsafe.objectFieldOffset(f_long_field);

    51         } catch (Exception e) {

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

    53             e.printStackTrace();

    54         }

    55     }

    56 

    57     public static void main(String[] args)

    58     {

    59         final TestUnsafeVolatileGAS t = new TestUnsafeVolatileGAS();

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

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

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

    63             }

    64         }

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

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

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

    68             }

    69         }

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

    71             if ((Integer)t.testObj(Integer.valueOf(i)) != i-1) {

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

    73             }

    74         }

    75     }

    76 

    77     public int testInt(int i)

    78     {

    79         return unsafe.getAndSetInt(this, f_int_off, i);

    80     }

    81 

    82     public Object testObj(Object o)

    83     {

    84         return unsafe.getAndSetReference(this, f_obj_off, o);

    85     }

    86     public long testLong(long i)

    87     {

    88         return unsafe.getAndSetLong(this, f_long_off, i);

    89     }

    90 }