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annotate test/compiler/6851282/Test.java @ 12986:1b422ef5288a

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8025728: Missing volatile specifier for field G1AllocRegion::_alloc_region Summary: The field G1AllocRegion::_alloc_region needs to be declared volatile as it is used with that intention. Otherwise the compiler may generate the code that reloads the value which might have changed in the meantime, leading to spurious crashes. Reviewed-by: iveresov, simonis, tschatzl Contributed-by: Axel Siebenborn <axel.siebenborn@sap.com>
author tschatzl
date Wed, 23 Oct 2013 10:23:06 +0200
parents c18cbe5936b8
children
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1 /*
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2 * Copyright (c) 2009, 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 6851282
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28 * @summary JIT miscompilation results in null entry in array when using CompressedOops
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29 *
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30 * @run main/othervm/timeout=600 -Xmx256m -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops Test
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31 */
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32
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33 import java.util.ArrayList;
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34 import java.util.List;
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35
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36 public class Test {
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37 void foo(A a, A[] as) {
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38 for (A a1 : as) {
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39 B[] filtered = a.c(a1);
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40 for (B b : filtered) {
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41 if (b == null) {
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42 System.out.println("bug: b == null");
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43 System.exit(97);
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44 }
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45 }
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46 }
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47 }
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48
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49 public static void main(String[] args) {
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50 List<A> as = new ArrayList<A>();
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51 for (int i = 0; i < 5000; i++) {
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52 List<B> bs = new ArrayList<B>();
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53 for (int j = i; j < i + 1000; j++)
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54 bs.add(new B(j));
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55 as.add(new A(bs.toArray(new B[0])));
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56 }
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57 new Test().foo(as.get(0), as.subList(1, as.size()).toArray(new A[0]));
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58 }
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59 }
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60
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61 class A {
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62 final B[] bs;
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63
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64 public A(B[] bs) {
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65 this.bs = bs;
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66 }
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67
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68 final B[] c(final A a) {
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69 return new BoxedArray<B>(bs).filter(new Function<B, Boolean>() {
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70 public Boolean apply(B arg) {
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71 for (B b : a.bs) {
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72 if (b.d == arg.d)
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73 return true;
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74 }
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75 return false;
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76 }
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77 });
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78 }
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79 }
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80
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81 class BoxedArray<T> {
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82
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83 private final T[] array;
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84
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85 BoxedArray(T[] array) {
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86 this.array = array;
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87 }
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88
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89 public T[] filter(Function<T, Boolean> function) {
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90 boolean[] include = new boolean[array.length];
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91 int len = 0;
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92 int i = 0;
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93 while (i < array.length) {
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94 if (function.apply(array[i])) {
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95 include[i] = true;
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96 len += 1;
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97 }
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98 i += 1;
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99 }
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100 T[] result = (T[]) java.lang.reflect.Array.newInstance(array.getClass().getComponentType(), len);
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101 len = 0;
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102 i = 0;
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103 while (len < result.length) {
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104 if (include[i]) {
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105 result[len] = array[i];
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106 len += 1;
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107 }
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108 i += 1;
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109 }
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110 return result;
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111 }
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112 }
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113
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114 interface Function<T, R> {
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115 R apply(T arg);
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116 }
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117
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118 class B {
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119 final int d;
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120 public B(int d) {
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121 this.d = d;
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122 }
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123 }
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124