1 /* 2 * Copyright (c) 2016, 2017, 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 * sun.hotspot.WhiteBox$WhiteBoxPermission 51 * 52 * @run main/othervm/timeout=240 -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 53 * gc.g1.humongousObjects.ClassLoaderGenerator 1 54 * 55 * @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 56 * -Xlog:class+load,class+unload=debug:file=TestHumongousClassLoader_Full_GC.log 57 * -XX:G1HeapRegionSize=1M 58 * gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC 59 * 60 * @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 61 * -Xlog:class+load,class+unload=debug:file=TestHumongousClassLoader_Full_GC_Mem_Pressure.log 62 * -XX:G1HeapRegionSize=1M 63 * gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC_MEMORY_PRESSURE 64 * 65 *@run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. 66 * -Xlog:class+load,class+unload=debug:file=TestHumongousClassLoader_CMC.log 67 * -XX:G1HeapRegionSize=1M -XX:MaxTenuringThreshold=1 68 * gc.g1.humongousObjects.TestHumongousClassLoader CMC 69 * 70 */ 71 72 public class TestHumongousClassLoader { 73 74 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 75 private static final String SAMPLE_CLASS_NAME_PREFIX = "SampleClassFiller"; 76 public static final String SIMPLE_CLASSLOADER_NAME = "SimpleClassLoader"; 77 public static final String HUMONGOUS_CLASSLOADER_NAME = "HumongousClassLoader"; 78 79 80 public static final String LOAD_CLASS_METHOD_PROTOTYPE = 81 " @Override\n" 82 + " public Class loadClass(String fileName) throws ClassNotFoundException {\n" 83 + " if (${ClassLoadFilter}) {\n" 84 + " System.out.println(\"Loading class \" + fileName);\n" 85 + " byte[] b = null;\n" 86 + " try {\n" 87 + " b = Files.readAllBytes(new File(fileName + \".class\").toPath());\n" 88 + " } catch (IOException e) {\n" 89 + " e.printStackTrace();\n" 90 + " }\n" 91 + " Class c = defineClass(fileName, b, 0, b.length);\n" 92 + " resolveClass(c);\n" 93 + " return c;\n" 94 + " } else {\n" 95 + " return super.loadClass(fileName);\n" 96 + " }\n" 97 + "\n" 98 + "\n" 99 + " }\n"; 100 101 public static final String CLASS_HEADER = "import java.io.File;\n" 102 + "import java.io.IOException;\n" 103 + "import java.nio.file.Files;\n" 104 + "import java.nio.file.Paths;\n"; 105 106 public static final String GENERIC_PROTOTYPE = "${ClassHeader}\n" 107 + "public class ${ClassName} extends ${BaseClass}{\n" 108 + " ${ConstructorClause}\n" 109 + " ${Methods}\n" 110 + " ${Fields}\n" 111 + "}\n"; 112 113 public static final String CONSTUCTOR_PROTOTYPE = "public ${ClassName}(ClassLoader parent) { super(parent);}\n"; 114 115 private enum GC { 116 FULL_GC { 117 @Override provoke()118 public void provoke() { 119 System.gc(); 120 } 121 }, 122 CMC { 123 @Override provoke()124 public void provoke() { 125 // We need 2 young gc to promote class loader to old gen 126 // Otherwise it will not be unloaded after CMC 127 WHITE_BOX.youngGC(); 128 Helpers.waitTillCMCFinished(WHITE_BOX, 0); 129 WHITE_BOX.youngGC(); 130 Helpers.waitTillCMCFinished(WHITE_BOX, 0); 131 WHITE_BOX.g1StartConcMarkCycle(); 132 Helpers.waitTillCMCFinished(WHITE_BOX, 0); 133 } 134 }, 135 FULL_GC_MEMORY_PRESSURE { 136 @Override provoke()137 public void provoke() { 138 WHITE_BOX.fullGC(); 139 } 140 }; 141 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); 142 provoke()143 public abstract void provoke(); 144 } 145 main(String[] args)146 public static void main(String[] args) throws ClassNotFoundException, InstantiationException, 147 IllegalAccessException, IOException, NoSuchMethodException, InvocationTargetException { 148 149 if (args.length != 1) { 150 throw new Error("Test Bug: Expected GC type wasn't provided as command line argument"); 151 } 152 GC gc = GC.valueOf(args[0]); 153 154 Path wrkDir = Paths.get(""); 155 URL[] url = {wrkDir.toUri().toURL()}; 156 URLClassLoader urlLoader = new URLClassLoader(url); 157 158 Class<?> simpleClassLoaderClass = urlLoader.loadClass(SIMPLE_CLASSLOADER_NAME); 159 urlLoader.close(); 160 161 ClassLoader simpleClassLoader = (ClassLoader) simpleClassLoaderClass 162 .getConstructor(java.lang.ClassLoader.class) 163 .newInstance(TestHumongousClassLoader.class.getClassLoader()); 164 165 // Sanity check 166 Asserts.assertEquals(WB.g1IsHumongous(simpleClassLoader), false, 167 "Test Bug: simpleClassLoader is expected to be non-humongous but it's humongous"); 168 169 170 Class<?> humongousClassLoaderClass = simpleClassLoader.loadClass(HUMONGOUS_CLASSLOADER_NAME); 171 172 ClassLoader humongousClassLoader = (ClassLoader) humongousClassLoaderClass 173 .getConstructor(java.lang.ClassLoader.class) 174 .newInstance(simpleClassLoader); 175 176 // Sanity check 177 Asserts.assertEquals(WB.g1IsHumongous(humongousClassLoader), true, 178 "Test Bug: humongousClassLoader is expected to be humongous but it's non-humongous"); 179 180 //Asserts.assertEquals(1,0); 181 182 Object[] loadedClasses = new Object[]{ 183 G1SampleClass.LARGEST_NON_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 184 .newInstance(), 185 G1SampleClass.SMALLEST_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 186 .newInstance(), 187 G1SampleClass.ONE_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 188 .newInstance(), 189 G1SampleClass.TWO_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) 190 .newInstance(), 191 }; 192 193 // forgetting references to loaded classes 194 for (int i = 0; i < loadedClasses.length; ++i) { 195 loadedClasses[i] = null; 196 } 197 198 // forgetting referencies to classloaders 199 humongousClassLoader = null; 200 humongousClassLoaderClass = null; 201 202 simpleClassLoader = null; 203 simpleClassLoaderClass = null; 204 205 gc.provoke(); 206 207 // Test checks 208 Asserts.assertEquals(WB.isClassAlive(HUMONGOUS_CLASSLOADER_NAME), false, 209 String.format("Classloader class %s is loaded after we forget all references to it", 210 HUMONGOUS_CLASSLOADER_NAME)); 211 212 for (G1SampleClass sampleClass : G1SampleClass.values()) { 213 String className = Helpers.enumNameToClassName(sampleClass.name()) + "Class"; 214 Asserts.assertEquals(WB.isClassAlive(className), false, 215 String.format("Class %s is loaded after we forget all references to it", className)); 216 } 217 } 218 219 } 220