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annotate test/compiler/classUnloading/anonymousClass/TestAnonymousClassUnloading.java @ 20350:c3990b8c710e hs25.40-b07

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8054402: "klass->is_loader_alive(_is_alive)) failed: must be alive" for anonymous classes Summary: Because anonymous classes are not in the system dictionary, we have to set 'unloading_occurred' based on 'CLDG::do_unloading()'. Added jtreg test. Reviewed-by: kvn, coleenp
author thartmann
date Mon, 25 Aug 2014 08:20:17 +0200
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20350
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1 /*
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2 * Copyright (c) 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 import sun.hotspot.WhiteBox;
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25 import sun.misc.Unsafe;
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26 import sun.misc.IOUtils;
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27
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28 import java.lang.reflect.Method;
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29 import java.net.URL;
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30 import java.net.URLConnection;
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31
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32 /*
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33 * @test TestAnonymousClassUnloading
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34 * @bug 8054402
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35 * @summary "Tests unloading of anonymous classes."
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36 * @library /testlibrary /testlibrary/whitebox
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37 * @compile TestAnonymousClassUnloading.java
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38 * @run main ClassFileInstaller TestAnonymousClassUnloading
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39 * sun.hotspot.WhiteBox
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40 * sun.hotspot.WhiteBox$WhiteBoxPermission
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41 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-BackgroundCompilation TestAnonymousClassUnloading
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42 */
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43 public class TestAnonymousClassUnloading {
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44 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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45 private static final Unsafe UNSAFE = Unsafe.getUnsafe();
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46 private static int COMP_LEVEL_SIMPLE = 1;
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47 private static int COMP_LEVEL_FULL_OPTIMIZATION = 4;
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48
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49 /**
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50 * We override hashCode here to be able to access this implementation
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51 * via an Object reference (we cannot cast to TestAnonymousClassUnloading).
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52 */
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53 @Override
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54 public int hashCode() {
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55 return 42;
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56 }
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57
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58 /**
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59 * Does some work by using the anonymousClass.
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60 * @param anonymousClass Class performing some work (will be unloaded)
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61 */
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62 static private void doWork(Class<?> anonymousClass) throws InstantiationException, IllegalAccessException {
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63 // Create a new instance
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64 Object anon = anonymousClass.newInstance();
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65 // We would like to call a method of anonymousClass here but we cannot cast because the class
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66 // was loaded by a different class loader. One solution would be to use reflection but since
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67 // we want C2 to implement the call as an IC we call Object::hashCode() here which actually
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68 // calls anonymousClass::hashCode(). C2 will then implement this call as an IC.
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69 if (anon.hashCode() != 42) {
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70 new RuntimeException("Work not done");
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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 * Makes sure that method is compiled by forcing compilation if not yet compiled.
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76 * @param m Method to be checked
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77 */
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78 static private void makeSureIsCompiled(Method m) {
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79 // Make sure background compilation is disabled
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80 if (WHITE_BOX.getBooleanVMFlag("BackgroundCompilation")) {
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81 throw new RuntimeException("Background compilation enabled");
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82 }
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83
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84 // Check if already compiled
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85 if (!WHITE_BOX.isMethodCompiled(m)) {
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86 // If not, try to compile it with C2
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87 if(!WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_FULL_OPTIMIZATION)) {
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88 // C2 compiler not available, try to compile with C1
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89 WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_SIMPLE);
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90 }
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91 // Because background compilation is disabled, method should now be compiled
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92 if(!WHITE_BOX.isMethodCompiled(m)) {
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93 throw new RuntimeException(m + " not compiled");
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94 }
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95 }
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96 }
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97
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98 /**
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99 * This test creates stale Klass* metadata referenced by a compiled IC.
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100 *
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101 * The following steps are performed:
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102 * (1) An anonymous version of TestAnonymousClassUnloading is loaded by a custom class loader
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103 * (2) The method doWork that calls a method of the anonymous class is compiled. The call
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104 * is implemented as an IC referencing Klass* metadata of the anonymous class.
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105 * (3) Unloading of the anonymous class is enforced. The IC now references dead metadata.
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106 */
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107 static public void main(String[] args) throws Exception {
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108 // (1) Load an anonymous version of this class using the corresponding Unsafe method
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109 URL classUrl = TestAnonymousClassUnloading.class.getResource("TestAnonymousClassUnloading.class");
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110 URLConnection connection = classUrl.openConnection();
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111 byte[] classBytes = IOUtils.readFully(connection.getInputStream(), connection.getContentLength(), true);
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112 Class<?> anonymousClass = UNSAFE.defineAnonymousClass(TestAnonymousClassUnloading.class, classBytes, null);
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113
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114 // (2) Make sure all paths of doWork are profiled and compiled
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115 for (int i = 0; i < 100000; ++i) {
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116 doWork(anonymousClass);
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117 }
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118
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119 // Make sure doWork is compiled now
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120 Method doWork = TestAnonymousClassUnloading.class.getDeclaredMethod("doWork", Class.class);
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121 makeSureIsCompiled(doWork);
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122
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123 // (3) Throw away reference to anonymousClass to allow unloading
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124 anonymousClass = null;
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125
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126 // Force garbage collection to trigger unloading of anonymousClass
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127 // Dead metadata reference to anonymousClass triggers JDK-8054402
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128 WHITE_BOX.fullGC();
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129 }
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130 }