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.
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   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
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  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
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  23 
  24 /**
  25  * @test
  26  * @bug 8142386
  27  * @summary Unsafe access to an array is wrongly marked as mismatched
  28  * @modules java.base/jdk.internal.misc
  29  *
  30  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation
  31  *      compiler.intrinsics.unsafe.TestUnsafeMismatchedArrayFieldAccess
  32  */
  33 
  34 package compiler.intrinsics.unsafe;
  35 
  36 import jdk.internal.misc.Unsafe;
  37 
  38 public class TestUnsafeMismatchedArrayFieldAccess {
  39 
  40     private static final Unsafe UNSAFE = Unsafe.getUnsafe();
  41 
  42     static {
  43         try {
  44             array_offset = UNSAFE.objectFieldOffset(TestUnsafeMismatchedArrayFieldAccess.class.getDeclaredField("array"));
  45         }
  46         catch (Exception e) {
  47             throw new AssertionError(e);
  48         }
  49     }
  50 
  51     int[] array;
  52     static final long array_offset;
  53 
  54     void m() {
  55         UNSAFE.getReference(this, array_offset);
  56     }
  57 
  58     static public void main(String[] args) {
  59         TestUnsafeMismatchedArrayFieldAccess test = new TestUnsafeMismatchedArrayFieldAccess();
  60 
  61         for (int i = 0; i < 20000; i++) {
  62             test.m();
  63         }
  64     }
  65 }