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annotate test/compiler/unsafe/GetUnsafeObjectG1PreBarrier.java @ 12004:71526a36ebb4

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8022029: GetUnsafeObjectG1PreBarrier fails on 32-bit with: Unrecognized VM option 'ObjectAlignmentInBytes=32' Reviewed-by: kvn
author twisti
date Mon, 05 Aug 2013 15:03:40 -0700
parents 8d77d02828d9
children
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1 /*
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2 * Copyright (c) 2013, 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 * @test
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26 * @bug 8016474
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27 * @summary The bug only happens with C1 and G1 using a different ObjectAlignmentInBytes than KlassAlignmentInBytes (which is 8)
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71526a36ebb4 8022029: GetUnsafeObjectG1PreBarrier fails on 32-bit with: Unrecognized VM option 'ObjectAlignmentInBytes=32'
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28 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:ObjectAlignmentInBytes=32 GetUnsafeObjectG1PreBarrier
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29 */
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30
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31 import java.lang.reflect.Field;
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32
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33 import sun.misc.Unsafe;
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34
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35 public class GetUnsafeObjectG1PreBarrier {
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36 private static final Unsafe unsafe;
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37 private static final int N = 100_000;
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38
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39 static {
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40 try {
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41 Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
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42 theUnsafe.setAccessible(true);
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43 unsafe = (Unsafe) theUnsafe.get(null);
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44 } catch (NoSuchFieldException | IllegalAccessException e) {
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45 throw new IllegalStateException(e);
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46 }
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47 }
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48
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49 public Object a;
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50
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51 public static void main(String[] args) throws Throwable {
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52 new GetUnsafeObjectG1PreBarrier();
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53 }
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54
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55 public GetUnsafeObjectG1PreBarrier() throws Throwable {
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56 doit();
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57 }
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58
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59 private void doit() throws Throwable {
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60 Field field = GetUnsafeObjectG1PreBarrier.class.getField("a");
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61 long fieldOffset = unsafe.objectFieldOffset(field);
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62
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63 for (int i = 0; i < N; i++) {
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64 readField(this, fieldOffset);
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65 }
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66 }
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67
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68 private void readField(Object o, long fieldOffset) {
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69 unsafe.getObject(o, fieldOffset);
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70 }
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71 }