Mercurial > hg > graal-jvmci-8

annotate test/compiler/unsafe/TestUnsafeLoadControl.java @ 24026:e901fb8a6f95

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Merge
author robm
date Fri, 08 Jul 2016 13:59:32 +0100
parents c1c199dde5c9
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1 /*
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2 * Copyright (c) 2015, 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 8077504
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27 * @summary Unsafe load can loose control dependency and cause crash
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28 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestUnsafeLoadControl
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29 *
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30 */
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31
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32 import java.lang.reflect.Field;
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33 import sun.misc.Unsafe;
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34
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35 public class TestUnsafeLoadControl {
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36
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37 private static final Unsafe UNSAFE;
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38
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39 static {
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40 try {
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41 Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
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42 unsafeField.setAccessible(true);
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43 UNSAFE = (Unsafe) unsafeField.get(null);
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44 } catch(Exception e) {
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45 throw new RuntimeException(e);
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46 }
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47 }
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48
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49 static int val;
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50 static void test1(int[] a, boolean[] flags, boolean flag, long j) {
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51 for (int i = 0; i < 10; i++) {
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52 if (flags[i]) {
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53 if (flag) {
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54 long address = (j << 2) + UNSAFE.ARRAY_INT_BASE_OFFSET;
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55 int v = UNSAFE.getInt(a, address);
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56 val = v;
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57 }
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58 }
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59 }
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60 }
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61
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62 static int test2(int[] a, boolean[] flags, boolean flag, long j) {
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63 int sum = 0;
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64 for (int i = 0; i < 10; i++) {
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65 if (flags[i]) {
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66 if (flag) {
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67 long address = (j << 2) + UNSAFE.ARRAY_INT_BASE_OFFSET;
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68 int v = UNSAFE.getInt(a, address);
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69 if (v == 0) {
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70 sum++;
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71 }
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72 }
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73 }
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74 }
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75 return sum;
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76 }
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77
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78 static public void main(String[] args) {
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79 boolean[] flags = new boolean[10];
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80 for (int i = 0; i < flags.length; i++) {
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81 flags[i] = true;
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82 }
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83 int[] array = new int[10];
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84 for (int i = 0; i < 20000; i++) {
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85 test1(array, flags, true, 0);
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86 }
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87 for (int i = 0; i < flags.length; i++) {
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88 flags[i] = false;
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89 }
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90 test1(array, flags, true, Long.MAX_VALUE/4);
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91
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92 for (int i = 0; i < flags.length; i++) {
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93 flags[i] = true;
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94 }
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95 for (int i = 0; i < 20000; i++) {
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96 test2(array, flags, true, 0);
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97 }
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98 for (int i = 0; i < flags.length; i++) {
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99 flags[i] = false;
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100 }
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101 test2(array, flags, true, Long.MAX_VALUE/4);
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102 }
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103 }