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annotate test/gc/metaspace/G1AddMetaspaceDependency.java @ 22981:f967da7f0c3c

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8062537: [TESTBUG] Conflicting GC combinations in hotspot tests Reviewed-by: tschatzl, jwilhelm
author jwilhelm
date Thu, 23 Apr 2015 15:59:48 +0200
parents 77a774ab3cf0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2013, 2014, 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 * @requires vm.gc=="G1" | vm.gc=="null"
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28 * @summary Checks that we don't get locking problems when adding metaspace dependencies with the G1 update buffer monitor
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29 * @run main/othervm -XX:+UseG1GC -XX:G1UpdateBufferSize=1 G1AddMetaspaceDependency
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30 */
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31
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32 import java.io.InputStream;
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33
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34 public class G1AddMetaspaceDependency {
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35
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36 static byte[] getClassBytes(String name) {
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37 byte[] b = null;
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38 try (InputStream is = ClassLoader.getSystemResourceAsStream(name)) {
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39 byte[] tmp = new byte[is.available()];
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40 is.read(tmp);
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41 b = tmp;
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42 } finally {
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43 if (b == null) {
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44 throw new RuntimeException("Unable to load class file");
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45 }
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46 return b;
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47 }
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48 }
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49
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50 static final String a_name = G1AddMetaspaceDependency.class.getName() + "$A";
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51 static final String b_name = G1AddMetaspaceDependency.class.getName() + "$B";
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52
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53 public static void main(String... args) throws Exception {
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54 final byte[] a_bytes = getClassBytes(a_name + ".class");
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55 final byte[] b_bytes = getClassBytes(b_name + ".class");
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56
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57 for (int i = 0; i < 1000; i += 1) {
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58 runTest(a_bytes, b_bytes);
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59 }
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60 }
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61
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62 static class Loader extends ClassLoader {
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63 private final String myClass;
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64 private final byte[] myBytes;
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65 private final String friendClass;
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66 private final ClassLoader friendLoader;
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67
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68 Loader(String myClass, byte[] myBytes,
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69 String friendClass, ClassLoader friendLoader) {
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70 this.myClass = myClass;
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71 this.myBytes = myBytes;
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72 this.friendClass = friendClass;
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73 this.friendLoader = friendLoader;
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74 }
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75
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76 Loader(String myClass, byte[] myBytes) {
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77 this(myClass, myBytes, null, null);
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78 }
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79
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80 @Override
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81 public Class<?> loadClass(String name) throws ClassNotFoundException {
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82 Class<?> c = findLoadedClass(name);
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83 if (c != null) {
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84 return c;
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85 }
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86
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87 if (name.equals(friendClass)) {
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88 return friendLoader.loadClass(name);
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89 }
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90
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91 if (name.equals(myClass)) {
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92 c = defineClass(name, myBytes, 0, myBytes.length);
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93 resolveClass(c);
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94 return c;
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95 }
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96
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97 return findSystemClass(name);
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98 }
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99
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100 }
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101
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102 private static void runTest(final byte[] a_bytes, final byte[] b_bytes) throws Exception {
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103 Loader a_loader = new Loader(a_name, a_bytes);
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104 Loader b_loader = new Loader(b_name, b_bytes, a_name, a_loader);
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105 Loader c_loader = new Loader(b_name, b_bytes, a_name, a_loader);
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106 Loader d_loader = new Loader(b_name, b_bytes, a_name, a_loader);
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107 Loader e_loader = new Loader(b_name, b_bytes, a_name, a_loader);
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108 Loader f_loader = new Loader(b_name, b_bytes, a_name, a_loader);
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109 Loader g_loader = new Loader(b_name, b_bytes, a_name, a_loader);
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110
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111 Class<?> c;
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112 c = b_loader.loadClass(b_name);
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113 c = c_loader.loadClass(b_name);
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114 c = d_loader.loadClass(b_name);
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115 c = e_loader.loadClass(b_name);
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116 c = f_loader.loadClass(b_name);
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117 c = g_loader.loadClass(b_name);
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118 }
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119 public class A {
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120 }
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121 class B extends A {
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122 }
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123 }