1 /*
   2  * Copyright (c) 2015, 2016, 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  * @modules java.base/jdk.internal.misc
  30  * @library /test/lib
  31  *
  32  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation
  33  *      compiler.intrinsics.unsafe.TestUnsafeMismatchedArrayFieldAccess
  34  */
  35 
  36 package compiler.intrinsics.unsafe;
  37 
  38 import jdk.internal.misc.Unsafe;
  39 import jdk.test.lib.unsafe.UnsafeHelper;
  40 
  41 public class TestUnsafeMismatchedArrayFieldAccess {
  42 
  43     private static final Unsafe UNSAFE = UnsafeHelper.getUnsafe();
  44 
  45     static {
  46         try {
  47             array_offset = UNSAFE.objectFieldOffset(TestUnsafeMismatchedArrayFieldAccess.class.getDeclaredField("array"));
  48         }
  49         catch (Exception e) {
  50             throw new AssertionError(e);
  51         }
  52     }
  53 
  54     int[] array;
  55     static final long array_offset;
  56 
  57     void m() {
  58         UNSAFE.getObject(this, array_offset);
  59     }
  60 
  61     static public void main(String[] args) {
  62         TestUnsafeMismatchedArrayFieldAccess test = new TestUnsafeMismatchedArrayFieldAccess();
  63 
  64         for (int i = 0; i < 20000; i++) {
  65             test.m();
  66         }
  67     }
  68 }