1 /* 2 * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package gc.g1.humongousObjects; 25 26 import gc.testlibrary.Helpers; 27 import jdk.test.lib.Asserts; 28 import sun.hotspot.WhiteBox; 29 30 import java.io.IOException; 31 import java.lang.reflect.InvocationTargetException; 32 import java.net.URL; 33 import java.net.URLClassLoader; 34 import java.nio.file.Path; 35 import java.nio.file.Paths; 36 37 /** 38 * @test gc.g1.humongousObjects.TestHumongousClassLoader 39 * @summary Checks that unreachable classes and unreachable humongous class loader are unloaded after GC 40 * @requires vm.gc.G1 41 * @requires vm.opt.G1HeapRegionSize == "null" | vm.opt.G1HeapRegionSize == "1M" 42 * @requires vm.opt.ExplicitGCInvokesConcurrent != true 43 * @requires vm.opt.ClassUnloading != false 44 * @requires vm.opt.ClassUnloadingWithConcurrentMark != false 45 * @library /test/lib / 46 * @modules java.base/jdk.internal.misc 47 * @modules java.management 48 * @build sun.hotspot.WhiteBox 49 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 50 * 51 * @run main/othervm/timeout=240 -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 52 * gc.g1.humongousObjects.ClassLoaderGenerator 1 53 * 54 * @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 55 * -Xlog:class+load,class+unload=debug:file=TestHumongousClassLoader_Full_GC.log 56 * -XX:G1HeapRegionSize=1M 57 * gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC 58 * 59 * @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 60 * -Xlog:class+load,class+unload=debug:file=TestHumongousClassLoader_Full_GC_Mem_Pressure.log 61 * -XX:G1HeapRegionSize=1M 62 * gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC_MEMORY_PRESSURE 63 * 64 *@run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 65 * -Xlog:class+load,class+unload=debug:file=TestHumongousClassLoader_CMC.log 66 * -XX:G1HeapRegionSize=1M -XX:MaxTenuringThreshold=1 67 * gc.g1.humongousObjects.TestHumongousClassLoader CMC 68 * 69 */ 70 71 public class TestHumongousClassLoader { 72 73 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 74 private static final String SAMPLE_CLASS_NAME_PREFIX = "SampleClassFiller"; 75 public static final String SIMPLE_CLASSLOADER_NAME = "SimpleClassLoader"; 76 public static final String HUMONGOUS_CLASSLOADER_NAME = "HumongousClassLoader"; 77 78 79 public static final String LOAD_CLASS_METHOD_PROTOTYPE = 80 " @Override\n" 81 + " public Class loadClass(String fileName) throws ClassNotFoundException {\n" 82 + " if (${ClassLoadFilter}) {\n" 83 + " System.out.println(\"Loading class \" + fileName);\n" 84 + " byte[] b = null;\n" 85 + " try {\n" 86 + " b = Files.readAllBytes(new File(fileName + \".class\").toPath());\n" 87 + " } catch (IOException e) {\n" 88 + " e.printStackTrace();\n" 89 + " }\n" 90 + " Class c = defineClass(fileName, b, 0, b.length);\n" 91 + " resolveClass(c);\n" 92 + " return c;\n" 93 + " } else {\n" 94 + " return super.loadClass(fileName);\n" 95 + " }\n" 96 + "\n" 97 + "\n" 98 + " }\n"; 99 100 public static final String CLASS_HEADER = "import java.io.File;\n" 101 + "import java.io.IOException;\n" 102 + "import java.nio.file.Files;\n" 103 + "import java.nio.file.Paths;\n"; 104 105 public static final String GENERIC_PROTOTYPE = "${ClassHeader}\n" 106 + "public class ${ClassName} extends ${BaseClass}{\n" 107 + " ${ConstructorClause}\n" 108 + " ${Methods}\n" 109 + " ${Fields}\n" 110 + "}\n"; 111 112 public static final String CONSTUCTOR_PROTOTYPE = "public ${ClassName}(ClassLoader parent) { super(parent);}\n"; 113 114 private enum GC { 115 FULL_GC { 116 @Override provoke()117 public void provoke() { 118 System.gc(); 119 } 120 }, 121 CMC { 122 @Override provoke()123 public void provoke() { 124 // We need 2 young gc to promote class loader to old gen 125 // Otherwise it will not be unloaded after CMC 126 WHITE_BOX.youngGC(); 127 Helpers.waitTillCMCFinished(WHITE_BOX, 0); 128 WHITE_BOX.youngGC(); 129 Helpers.waitTillCMCFinished(WHITE_BOX, 0); 130 WHITE_BOX.g1StartConcMarkCycle(); 131 Helpers.waitTillCMCFinished(WHITE_BOX, 0); 132 } 133 }, 134 FULL_GC_MEMORY_PRESSURE { 135 @Override provoke()136 public void provoke() { 137 WHITE_BOX.fullGC(); 138 } 139 }; 140 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); 141 provoke()142 public abstract void provoke(); 143 } 144 main(String[] args)145 public static void main(String[] args) throws ClassNotFoundException, InstantiationException, 146 IllegalAccessException, IOException, NoSuchMethodException, InvocationTargetException { 147 148 if (args.length != 1) { 149 throw new Error("Test Bug: Expected GC type wasn't provided as command line argument"); 150 } 151 GC gc = GC.valueOf(args[0]); 152 153 Path wrkDir = Paths.get(""); 154 URL[] url = {wrkDir.toUri().toURL()}; 155 URLClassLoader urlLoader = new URLClassLoader(url); 156 157 Class<?> simpleClassLoaderClass = urlLoader.loadClass(SIMPLE_CLASSLOADER_NAME); 158 urlLoader.close(); 159 160 ClassLoader simpleClassLoader = (ClassLoader) simpleClassLoaderClass 161 .getConstructor(java.lang.ClassLoader.class) 162 .newInstance(TestHumongousClassLoader.class.getClassLoader()); 163 164 // Sanity check 165 Asserts.assertEquals(WB.g1IsHumongous(simpleClassLoader), false, 166 "Test Bug: simpleClassLoader is expected to be non-humongous but it's humongous"); 167 168 169 Class<?> humongousClassLoaderClass = simpleClassLoader.loadClass(HUMONGOUS_CLASSLOADER_NAME); 170 171 ClassLoader humongousClassLoader = (ClassLoader) humongousClassLoaderClass 172 .getConstructor(java.lang.ClassLoader.class) 173 .newInstance(simpleClassLoader); 174 175 // Sanity check 176 Asserts.assertEquals(WB.g1IsHumongous(humongousClassLoader), true, 177 "Test Bug: humongousClassLoader is expected to be humongous but it's non-humongous"); 178 179 //Asserts.assertEquals(1,0); 180 181 Object[] loadedClasses = new Object[]{ 182 G1SampleClass.LARGEST_NON_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 183 .newInstance(), 184 G1SampleClass.SMALLEST_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 185 .newInstance(), 186 G1SampleClass.ONE_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 187 .newInstance(), 188 G1SampleClass.TWO_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 189 .newInstance(), 190 }; 191 192 // forgetting references to loaded classes 193 for (int i = 0; i < loadedClasses.length; ++i) { 194 loadedClasses[i] = null; 195 } 196 197 // forgetting referencies to classloaders 198 humongousClassLoader = null; 199 humongousClassLoaderClass = null; 200 201 simpleClassLoader = null; 202 simpleClassLoaderClass = null; 203 204 gc.provoke(); 205 206 // Test checks 207 Asserts.assertEquals(WB.isClassAlive(HUMONGOUS_CLASSLOADER_NAME), false, 208 String.format("Classloader class %s is loaded after we forget all references to it", 209 HUMONGOUS_CLASSLOADER_NAME)); 210 211 for (G1SampleClass sampleClass : G1SampleClass.values()) { 212 String className = Helpers.enumNameToClassName(sampleClass.name()) + "Class"; 213 Asserts.assertEquals(WB.isClassAlive(className), false, 214 String.format("Class %s is loaded after we forget all references to it", className)); 215 } 216 } 217 218 } 219