1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. 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 /**
  26  * @test
  27  * @bug 8142386
  28  * @summary Unsafe access to an array is wrongly marked as mismatched
  29  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation TestUnsafeMismatchedArrayFieldAccess
  30  *
  31  */
  32 
  33 import java.lang.reflect.*;
  34 import sun.misc.Unsafe;
  35 
  36 public class TestUnsafeMismatchedArrayFieldAccess {
  37 
  38     private static final Unsafe UNSAFE;
  39 
  40     static {
  41         try {
  42             Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
  43             unsafeField.setAccessible(true);
  44             UNSAFE = (Unsafe) unsafeField.get(null);
  45             array_offset = UNSAFE.objectFieldOffset(TestUnsafeMismatchedArrayFieldAccess.class.getDeclaredField("array"));
  46         }
  47         catch (Exception e) {
  48             throw new AssertionError(e);
  49         }
  50     }
  51 
  52     int[] array;
  53     static final long array_offset;
  54 
  55     void m() {
  56         UNSAFE.getObject(this, array_offset);
  57     }
  58 
  59     static public void main(String[] args) {
  60         TestUnsafeMismatchedArrayFieldAccess test = new TestUnsafeMismatchedArrayFieldAccess();
  61 
  62         for (int i = 0; i < 20000; i++) {
  63             test.m();
  64         }
  65     }
  66 }