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annotate test/compiler/6968348/Test6968348.java @ 1827:52e82a6bedaf

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6968348: Byteswapped memory access can point to wrong location after JIT Reviewed-by: twisti, kvn, iveresov
author never
date Mon, 04 Oct 2010 17:09:18 -0700
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1827
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1 /*
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2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 /**
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26 * @test
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27 * @bug 6968348
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28 * @summary Byteswapped memory access can point to wrong location after JIT
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29 *
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30 * @run main Test6968348
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31 */
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32
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33 import sun.misc.Unsafe;
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34 import java.lang.reflect.*;
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35
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36 public class Test6968348 {
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37 static Unsafe unsafe;
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38 static final long[] buffer = new long[4096];
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39 static int array_long_base_offset;
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40
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41 public static void main(String[] args) throws Exception {
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42 Class c = Test6968348.class.getClassLoader().loadClass("sun.misc.Unsafe");
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43 Field f = c.getDeclaredField("theUnsafe");
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44 f.setAccessible(true);
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45 unsafe = (Unsafe)f.get(c);
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46 array_long_base_offset = unsafe.arrayBaseOffset(long[].class);
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47
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48 for (int n = 0; n < 100000; n++) {
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49 test();
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50 }
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51 }
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52
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53 public static void test() {
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54 for (long i = array_long_base_offset; i < 4096; i += 8) {
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55 unsafe.putLong(buffer, i, Long.reverseBytes(i));
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56 }
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57 }
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58 }