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 TestUnsafeVolatileCAE

    30 {

    31     public volatile int f_int = 0;

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

    33     public volatile long f_long = 0;

    34     public volatile byte f_byte = 0;

    35     public volatile short f_short = 0;

    36 

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

    38     public static Field f_int_field;

    39     public static Field f_obj_field;

    40     public static Field f_long_field;

    41     public static Field f_byte_field;

    42     public static Field f_short_field;

    43     public static long f_int_off;

    44     public static long f_obj_off;

    45     public static long f_long_off;

    46     public static long f_byte_off;

    47     public static long f_short_off;

    48 

    49     static {

    50         try {

    51             f_int_field = TestUnsafeVolatileCAE.class.getField("f_int");

    52             f_obj_field = TestUnsafeVolatileCAE.class.getField("f_obj");

    53             f_long_field = TestUnsafeVolatileCAE.class.getField("f_long");

    54             f_byte_field = TestUnsafeVolatileCAE.class.getField("f_byte");

    55             f_short_field = TestUnsafeVolatileCAE.class.getField("f_short");

    56             f_int_off = unsafe.objectFieldOffset(f_int_field);

    57             f_obj_off = unsafe.objectFieldOffset(f_obj_field);

    58             f_long_off = unsafe.objectFieldOffset(f_long_field);

    59             f_byte_off = unsafe.objectFieldOffset(f_byte_field);

    60             f_short_off = unsafe.objectFieldOffset(f_short_field);

    61         } catch (Exception e) {

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

    63             e.printStackTrace();

    64         }

    65     }

    66 

    67     public static void main(String[] args)

    68     {

    69         final TestUnsafeVolatileCAE t = new TestUnsafeVolatileCAE();

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

    71             t.f_int = -1;

    72             int res = t.testInt(-1, i);

    73             if (res != -1 || t.f_int != i) {

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

    75             }

    76         }

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

    78             t.f_long = -1;

    79             long res = t.testLong(-1, i);

    80             if (res != -1 || t.f_long != i) {

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

    82             }

    83         }

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

    85             t.f_byte = -1;

    86             byte i_b = (byte)i;

    87             byte res = t.testByte((byte)-1, i_b);

    88             if (res != (byte)-1 || t.f_byte != i_b) {

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

    90             }

    91         }

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

    93             t.f_short = -1;

    94             short i_s = (short)i;

    95             short res = t.testShort((byte)-1, i_s);

    96             if (res != (short)-1 || t.f_short != i_s) {

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

    98             }

    99         }

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

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

   102             t.f_obj = minusOne;

   103             Object res = t.testObj(minusOne, Integer.valueOf(i));

   104             if (res != minusOne || t.f_obj != i) {

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

   106             }

   107         }

   108     }

   109 

   110     public int testInt(int x, int i)

   111     {

   112         return unsafe.compareAndExchangeInt(this, f_int_off, x, i);

   113     }

   114 

   115     public Object testObj(Object x, Object o)

   116     {

   117         return unsafe.compareAndExchangeReference(this, f_obj_off, x, o);

   118     }

   119     public long testLong(long x, long i)

   120     {

   121         return unsafe.compareAndExchangeLong(this, f_long_off, x, i);

   122     }

   123 

   124     public byte testByte(byte x, byte i)

   125     {

   126         return unsafe.compareAndExchangeByte(this, f_byte_off, x, i);

   127     }

   128 

   129     public short testShort(short x, short i)

   130     {

   131         return unsafe.compareAndExchangeShort(this, f_short_off, x, i);

   132     }

   133 }