Mercurial > hg > truffle
annotate test/gc/metaspace/G1AddMetaspaceDependency.java @ 12986:1b422ef5288a
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 |
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date | Wed, 23 Oct 2013 10:23:06 +0200 |
parents | 77a774ab3cf0 |
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rev | line source |
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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 G1AddMetaspaceDependency |
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26 * @bug 8010196 |
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27 * @summary Checks that we don't get locking problems when adding metaspace dependencies with the G1 update buffer monitor |
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28 * @run main/othervm -XX:+UseG1GC -XX:G1UpdateBufferSize=1 G1AddMetaspaceDependency |
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29 */ |
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30 |
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31 import java.io.InputStream; |
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32 |
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33 public class G1AddMetaspaceDependency { |
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34 |
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35 static byte[] getClassBytes(String name) { |
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36 byte[] b = null; |
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37 try (InputStream is = ClassLoader.getSystemResourceAsStream(name)) { |
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38 byte[] tmp = new byte[is.available()]; |
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39 is.read(tmp); |
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40 b = tmp; |
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41 } finally { |
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42 if (b == null) { |
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43 throw new RuntimeException("Unable to load class file"); |
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44 } |
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45 return b; |
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46 } |
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47 } |
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48 |
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49 static final String a_name = G1AddMetaspaceDependency.class.getName() + "$A"; |
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50 static final String b_name = G1AddMetaspaceDependency.class.getName() + "$B"; |
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51 |
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52 public static void main(String... args) throws Exception { |
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53 final byte[] a_bytes = getClassBytes(a_name + ".class"); |
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54 final byte[] b_bytes = getClassBytes(b_name + ".class"); |
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55 |
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56 for (int i = 0; i < 1000; i += 1) { |
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57 runTest(a_bytes, b_bytes); |
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58 } |
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59 } |
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60 |
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61 static class Loader extends ClassLoader { |
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62 private final String myClass; |
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63 private final byte[] myBytes; |
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64 private final String friendClass; |
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65 private final ClassLoader friendLoader; |
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66 |
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67 Loader(String myClass, byte[] myBytes, |
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68 String friendClass, ClassLoader friendLoader) { |
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69 this.myClass = myClass; |
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70 this.myBytes = myBytes; |
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71 this.friendClass = friendClass; |
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72 this.friendLoader = friendLoader; |
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73 } |
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74 |
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75 Loader(String myClass, byte[] myBytes) { |
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76 this(myClass, myBytes, null, null); |
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77 } |
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78 |
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79 @Override |
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80 public Class<?> loadClass(String name) throws ClassNotFoundException { |
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81 Class<?> c = findLoadedClass(name); |
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82 if (c != null) { |
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83 return c; |
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84 } |
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85 |
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86 if (name.equals(friendClass)) { |
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87 return friendLoader.loadClass(name); |
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88 } |
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89 |
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90 if (name.equals(myClass)) { |
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91 c = defineClass(name, myBytes, 0, myBytes.length); |
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92 resolveClass(c); |
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93 return c; |
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94 } |
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95 |
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96 return findSystemClass(name); |
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97 } |
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98 |
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99 } |
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100 |
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101 private static void runTest(final byte[] a_bytes, final byte[] b_bytes) throws Exception { |
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102 Loader a_loader = new Loader(a_name, a_bytes); |
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103 Loader b_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
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104 Loader c_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
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105 Loader d_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
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106 Loader e_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
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107 Loader f_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
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108 Loader g_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
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109 |
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110 Class<?> c; |
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111 c = b_loader.loadClass(b_name); |
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112 c = c_loader.loadClass(b_name); |
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113 c = d_loader.loadClass(b_name); |
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114 c = e_loader.loadClass(b_name); |
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115 c = f_loader.loadClass(b_name); |
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116 c = g_loader.loadClass(b_name); |
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117 } |
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118 public class A { |
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119 } |
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120 class B extends A { |
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121 } |
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122 } |