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annotate test/compiler/classUnloading/methodUnloading/TestMethodUnloading.java @ 20384:d2c5fee67143

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8055657: Test compiler/classUnloading/methodUnloading/TestMethodUnloading.java does not work with non-default GC Summary: Remove the '-XX:+UseParallelGC' parameter from the test because it is conflicting with other GC settings. Reviewed-by: kvn
author thartmann
date Fri, 29 Aug 2014 10:47:50 +0200
parents 85c339200299
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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26 import java.lang.reflect.Method;
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27 import java.net.URL;
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28 import java.net.URLClassLoader;
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29
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30 /*
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31 * @test MethodUnloadingTest
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32 * @bug 8029443
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33 * @summary "Tests the unloading of methods to to class unloading"
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34 * @library /testlibrary /testlibrary/whitebox
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35 * @build TestMethodUnloading
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36 * @build WorkerClass
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37 * @run main ClassFileInstaller sun.hotspot.WhiteBox
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38 * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-BackgroundCompilation -XX:-UseCompressedOops -XX:CompileOnly=TestMethodUnloading::doWork TestMethodUnloading
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39 */
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40 public class TestMethodUnloading {
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41 private static final String workerClassName = "WorkerClass";
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42 private static int work = -1;
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43
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44 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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45 private static int COMP_LEVEL_SIMPLE = 1;
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46 private static int COMP_LEVEL_FULL_OPTIMIZATION = 4;
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47
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48 /**
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49 * Does some work by either using the workerClass or locally producing values.
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50 * @param workerClass Class performing some work (will be unloaded)
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51 * @param useWorker If true the workerClass is used
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52 */
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53 static private void doWork(Class<?> workerClass, boolean useWorker) throws InstantiationException, IllegalAccessException {
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54 if (useWorker) {
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55 // Create a new instance
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56 Object worker = workerClass.newInstance();
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57 // We would like to call a method of WorkerClass here but we cannot cast to WorkerClass
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58 // because the class was loaded by a different class loader. One solution would be to use
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59 // reflection but since we want C2 to implement the call as an optimized IC we call
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60 // Object::hashCode() here which actually calls WorkerClass::hashCode().
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61 // C2 will then implement this call as an optimized IC that points to a to-interpreter stub
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62 // referencing the Method* for WorkerClass::hashCode().
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63 work = worker.hashCode();
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64 if (work != 42) {
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65 new RuntimeException("Work not done");
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66 }
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67 } else {
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68 // Do some important work here
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69 work = 1;
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70 }
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71 }
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72
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73 /**
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74 * Makes sure that method is compiled by forcing compilation if not yet compiled.
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75 * @param m Method to be checked
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76 */
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77 static private void makeSureIsCompiled(Method m) {
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78 // Make sure background compilation is disabled
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79 if (WHITE_BOX.getBooleanVMFlag("BackgroundCompilation")) {
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80 throw new RuntimeException("Background compilation enabled");
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81 }
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82
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83 // Check if already compiled
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84 if (!WHITE_BOX.isMethodCompiled(m)) {
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85 // If not, try to compile it with C2
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86 if(!WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_FULL_OPTIMIZATION)) {
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87 // C2 compiler not available, try to compile with C1
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88 WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_SIMPLE);
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89 }
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90 // Because background compilation is disabled, method should now be compiled
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91 if(!WHITE_BOX.isMethodCompiled(m)) {
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92 throw new RuntimeException(m + " not compiled");
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93 }
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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 * This test creates stale Method* metadata in a to-interpreter stub of an optimized IC.
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99 *
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100 * The following steps are performed:
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101 * (1) A workerClass is loaded by a custom class loader
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102 * (2) The method doWork that calls a method of the workerClass is compiled. The call
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103 * is implemented as an optimized IC calling a to-interpreted stub. The to-interpreter
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104 * stub contains a Method* to a workerClass method.
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105 * (3) Unloading of the workerClass is enforced. The to-interpreter stub now contains a dead Method*.
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106 * (4) Depending on the implementation of the IC, the compiled version of doWork should still be
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107 * valid. We call it again without using the workerClass.
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108 */
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109 static public void main(String[] args) throws Exception {
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110 // (1) Create a custom class loader with no parent class loader
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111 URL url = TestMethodUnloading.class.getProtectionDomain().getCodeSource().getLocation();
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112 URLClassLoader loader = new URLClassLoader(new URL[] {url}, null);
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113
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114 // Load worker class with custom class loader
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115 Class<?> workerClass = Class.forName(workerClassName, true, loader);
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116
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117 // (2) Make sure all paths of doWork are profiled and compiled
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118 for (int i = 0; i < 100000; ++i) {
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119 doWork(workerClass, true);
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120 doWork(workerClass, false);
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121 }
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122
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123 // Make sure doWork is compiled now
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124 Method doWork = TestMethodUnloading.class.getDeclaredMethod("doWork", Class.class, boolean.class);
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125 makeSureIsCompiled(doWork);
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126
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127 // (3) Throw away class loader and reference to workerClass to allow unloading
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128 loader.close();
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129 loader = null;
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130 workerClass = null;
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131
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132 // Force garbage collection to trigger unloading of workerClass
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133 // Dead reference to WorkerClass::hashCode triggers JDK-8029443
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134 WHITE_BOX.fullGC();
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135
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136 // (4) Depending on the implementation of the IC, the compiled version of doWork
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137 // may still be valid here. Execute it without a workerClass.
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138 doWork(null, false);
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139 if (work != 1) {
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140 throw new RuntimeException("Work not done");
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141 }
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142
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143 doWork(Object.class, false);
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144 }
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145 }