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 /*
  25  * @test
  26  * @bug 8211320
  27  * @summary Aarch64: unsafe.compareAndSetByte() and unsafe.compareAndSetShort() c2 intrinsics broken with negative expected value
  28  *
  29  * @modules java.base/jdk.internal.misc
  30  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation  CASandCAEwithNegExpected
  31  */
  32 
  33 import java.lang.reflect.Field;
  34 import jdk.internal.misc.Unsafe;
  35 
  36 public class CASandCAEwithNegExpected {
  37     public volatile int f_int = -1;
  38     public volatile long f_long = -1;
  39     public volatile byte f_byte = -1;
  40     public volatile short f_short = -1;
  41 
  42     public static Unsafe unsafe = Unsafe.getUnsafe();
  43     public static Field f_int_field;
  44     public static Field f_long_field;
  45     public static Field f_byte_field;
  46     public static Field f_short_field;
  47     public static long f_int_off;
  48     public static long f_long_off;
  49     public static long f_byte_off;
  50     public static long f_short_off;
  51 
  52     static {
  53         try {
  54             f_int_field = CASandCAEwithNegExpected.class.getField("f_int");
  55             f_long_field = CASandCAEwithNegExpected.class.getField("f_long");
  56             f_byte_field = CASandCAEwithNegExpected.class.getField("f_byte");
  57             f_short_field = CASandCAEwithNegExpected.class.getField("f_short");
  58             f_int_off = unsafe.objectFieldOffset(f_int_field);
  59             f_long_off = unsafe.objectFieldOffset(f_long_field);
  60             f_byte_off = unsafe.objectFieldOffset(f_byte_field);
  61             f_short_off = unsafe.objectFieldOffset(f_short_field);
  62         } catch (Exception e) {
  63             System.out.println("reflection failed " + e);
  64             e.printStackTrace();
  65         }
  66     }
  67 
  68     static public void main(String[] args) {
  69         CASandCAEwithNegExpected t = new CASandCAEwithNegExpected();
  70         for (int i = 0; i < 20_000; i++) {
  71             t.test();
  72         }
  73     }
  74 
  75     // check proper handling of sign extension of expected value in comparison
  76     void test() {
  77         f_int = -1;
  78         f_long = -1;
  79         f_byte = -1;
  80         f_short = -1;
  81 
  82         unsafe.compareAndSetInt(this, f_int_off, -1, 42);
  83         if (f_int != 42) {
  84             throw new RuntimeException("CAS failed");
  85         }
  86         unsafe.compareAndSetLong(this, f_long_off, -1, 42);
  87         if (f_long != 42) {
  88             throw new RuntimeException("CAS failed");
  89         }
  90         unsafe.compareAndSetByte(this, f_byte_off, (byte)-1, (byte)42);
  91         if (f_byte != 42) {
  92             throw new RuntimeException("CAS failed");
  93         }
  94         unsafe.compareAndSetShort(this, f_short_off, (short)-1, (short)42);
  95         if (f_short != 42) {
  96             throw new RuntimeException("CAS failed");
  97         }
  98 
  99         f_int = -1;
 100         f_long = -1;
 101         f_byte = -1;
 102         f_short = -1;
 103 
 104         unsafe.compareAndExchangeInt(this, f_int_off, -1, 42);
 105         if (f_int != 42) {
 106             throw new RuntimeException("CAE failed");
 107         }
 108         unsafe.compareAndExchangeLong(this, f_long_off, -1, 42);
 109         if (f_long != 42) {
 110             throw new RuntimeException("CAE failed");
 111         }
 112         unsafe.compareAndExchangeByte(this, f_byte_off, (byte)-1, (byte)42);
 113         if (f_byte != 42) {
 114             throw new RuntimeException("CAE failed");
 115         }
 116         unsafe.compareAndExchangeShort(this, f_short_off, (short)-1, (short)42);
 117         if (f_short != 42) {
 118             throw new RuntimeException("CAE failed");
 119         }
 120     }
 121 
 122 }