1 /*
   2  * Copyright (c) 2010, 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 6968348
  28  * @summary Byteswapped memory access can point to wrong location after JIT
  29  * @modules java.base/jdk.internal.misc
  30  *
  31  * @run main compiler.c2.Test6968348
  32  */
  33 
  34 package compiler.c2;
  35 
  36 import jdk.internal.misc.Unsafe;
  37 
  38 import java.lang.reflect.Field;
  39 
  40 public class Test6968348 {
  41     static Unsafe unsafe = Unsafe.getUnsafe();
  42     static final long[] buffer = new long[4096];
  43     static int array_long_base_offset;
  44 
  45     public static void main(String[] args) throws Exception {
  46         array_long_base_offset = unsafe.arrayBaseOffset(long[].class);
  47 
  48         for (int n = 0; n < 100000; n++) {
  49             test();
  50         }
  51     }
  52 
  53     public static void test() {
  54         for (long i = array_long_base_offset; i < 4096; i += 8) {
  55             unsafe.putLong(buffer, i, Long.reverseBytes(i));
  56         }
  57     }
  58 }