# HG changeset patch # User kzhaldyb # Date 1461250514 -10800 # Node ID c960918f0bfb1ba0006d06aff896c337050485c6 # Parent 8dd94eb5dcfc638ed212cb15717b5a5781bfe3b1 8132718: Add tests which check that when humongous classloader object becomes unreachable it and all classes that were loaded in it should be collected Reviewed-by: jmasa, dfazunen diff -r 8dd94eb5dcfc -r c960918f0bfb hotspot/test/gc/g1/humongousObjects/ClassLoaderGenerator.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/test/gc/g1/humongousObjects/ClassLoaderGenerator.java Thu Apr 21 17:55:14 2016 +0300 @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ +package gc.g1.humongousObjects; + +import gc.testlibrary.Helpers; + +import java.io.IOException; +import java.nio.file.Path; +import java.nio.file.Paths; + +/** + * Generates non-humongous and humongous class loaders. + * Since the generation depends on current host architecture it cannot be done as part of pre-compilation step + */ +public class ClassLoaderGenerator { + public static void main(String[] args) throws IOException { + + if (args.length != 1) { + throw new Error("Test Bug: Expected region size wasn't provided as command line argument"); + } + + long regionSize = Long.parseLong(args[0]) * 1024 * 1024; + + Path wrkDir = Paths.get(""); + generateClassLoader(regionSize, wrkDir); + + } + + public static void generateClassLoader(long regionSize, Path wrkDir) throws IOException { + // Generating simple classloader + String finalSimpleClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE + .replace("${Methods}", + TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE + .replace("${ClassLoadFilter}", + "fileName.equals(\"" + TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME + + "\")")) + .replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER) + .replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE); + + Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME, "ClassLoader", + finalSimpleClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE, regionSize / 4, + wrkDir, TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME + "Base"); + + + // Preparations for generating humongous classloader + + // Generating condition for loadClass method of generated class loader + // We want the generated class loader to load only classes from G1SampleClass enum + // All other classes should be loaded by parent classloader + // As result we get full loadClass method + StringBuilder classesToLoadBuilder = new StringBuilder(); + for (G1SampleClass g1SampleClass : G1SampleClass.values()) { + if (classesToLoadBuilder.length() != 0) { + classesToLoadBuilder.append(" || "); + } + classesToLoadBuilder.append("fileName.startsWith(\"" + Helpers.enumNameToClassName(g1SampleClass.name()) + + "\")"); + } + + // Generating final class loader prototype - with specified methods,header and constructor + String finalHumongousClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE + .replace("${Methods}", + TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE + .replace("${ClassLoadFilter}", classesToLoadBuilder)) + .replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER) + .replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE); + + + // Generating humongous classloader with specified name, base class, final class prototype and + // constructor prototype for filler classes + // Generated class instance should be humongous since we specify size of (regionSize * 3 / 4) + Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME, "ClassLoader", + finalHumongousClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE, + regionSize * 3 / 4, + wrkDir, TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME + "Base"); + + + } +} diff -r 8dd94eb5dcfc -r c960918f0bfb hotspot/test/gc/g1/humongousObjects/TestHumongousClassLoader.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/test/gc/g1/humongousObjects/TestHumongousClassLoader.java Thu Apr 21 17:55:14 2016 +0300 @@ -0,0 +1,220 @@ +/* + * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +package gc.g1.humongousObjects; + +import gc.testlibrary.Helpers; +import jdk.test.lib.Asserts; +import sun.hotspot.WhiteBox; + +import java.io.IOException; +import java.lang.reflect.InvocationTargetException; +import java.net.URL; +import java.net.URLClassLoader; +import java.nio.file.Path; +import java.nio.file.Paths; + +/** + * @test gc.g1.humongousObjects.TestHumongousClassLoader + * @summary Checks that unreachable classes and unreachable humongous class loader are unloaded after GC + * @requires vm.gc=="G1" | vm.gc=="null" + * @requires vm.opt.G1HeapRegionSize == "null" | vm.opt.G1HeapRegionSize == "1M" + * @library /testlibrary /test/lib / + * @modules java.management + * @build sun.hotspot.WhiteBox + * gc.testlibrary.Helpers + * gc.g1.humongousObjects.G1SampleClass + * gc.g1.humongousObjects.ClassLoaderGenerator + * gc.g1.humongousObjects.TestHumongousClassLoader + * + * @run driver ClassFileInstaller sun.hotspot.WhiteBox + * sun.hotspot.WhiteBox$WhiteBoxPermission + * + * @run main/othervm/timeout=240 -Xms256M -Xmx256M -XX:+WhiteBoxAPI -Xbootclasspath/a:. + * gc.g1.humongousObjects.ClassLoaderGenerator 1 + * + * @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. + * -Xlog:classload,classunload=debug:file=TestHumongousClassLoader_Full_GC.log + * -XX:G1HeapRegionSize=1M + * gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC + * + * @run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. + * -Xlog:classload,classunload=debug:file=TestHumongousClassLoader_Full_GC_Mem_Pressure.log + * -XX:G1HeapRegionSize=1M + * gc.g1.humongousObjects.TestHumongousClassLoader FULL_GC_MEMORY_PRESSURE + * + *@run main/othervm -Xms256M -Xmx256M -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. + * -Xlog:classload,classunload=debug:file=TestHumongousClassLoader_CMC.log + * -XX:G1HeapRegionSize=1M -XX:MaxTenuringThreshold=1 + * gc.g1.humongousObjects.TestHumongousClassLoader CMC + * + */ + +public class TestHumongousClassLoader { + + private static final WhiteBox WB = WhiteBox.getWhiteBox(); + private static final String SAMPLE_CLASS_NAME_PREFIX = "SampleClassFiller"; + public static final String SIMPLE_CLASSLOADER_NAME = "SimpleClassLoader"; + public static final String HUMONGOUS_CLASSLOADER_NAME = "HumongousClassLoader"; + + + public static final String LOAD_CLASS_METHOD_PROTOTYPE = + " @Override\n" + + " public Class loadClass(String fileName) throws ClassNotFoundException {\n" + + " if (${ClassLoadFilter}) {\n" + + " System.out.println(\"Loading class \" + fileName);\n" + + " byte[] b = null;\n" + + " try {\n" + + " b = Files.readAllBytes(new File(fileName + \".class\").toPath());\n" + + " } catch (IOException e) {\n" + + " e.printStackTrace();\n" + + " }\n" + + " Class c = defineClass(fileName, b, 0, b.length);\n" + + " resolveClass(c);\n" + + " return c;\n" + + " } else {\n" + + " return super.loadClass(fileName);\n" + + " }\n" + + "\n" + + "\n" + + " }\n"; + + public static final String CLASS_HEADER = "import java.io.File;\n" + + "import java.io.IOException;\n" + + "import java.nio.file.Files;\n" + + "import java.nio.file.Paths;\n"; + + public static final String GENERIC_PROTOTYPE = "${ClassHeader}\n" + + "public class ${ClassName} extends ${BaseClass}{\n" + + " ${ConstructorClause}\n" + + " ${Methods}\n" + + " ${Fields}\n" + + "}\n"; + + public static final String CONSTUCTOR_PROTOTYPE = "public ${ClassName}(ClassLoader parent) { super(parent);}\n"; + + private enum GC { + FULL_GC { + @Override + public void provoke() { + System.gc(); + } + }, + CMC { + @Override + public void provoke() { + // We need 2 young gc to promote class loader to old gen + // Otherwise it will not be unloaded after CMC + WHITE_BOX.youngGC(); + Helpers.waitTillCMCFinished(WHITE_BOX, 0); + WHITE_BOX.youngGC(); + Helpers.waitTillCMCFinished(WHITE_BOX, 0); + WHITE_BOX.g1StartConcMarkCycle(); + Helpers.waitTillCMCFinished(WHITE_BOX, 0); + } + }, + FULL_GC_MEMORY_PRESSURE { + @Override + public void provoke() { + WHITE_BOX.fullGC(); + } + }; + private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); + + public abstract void provoke(); + } + + public static void main(String[] args) throws ClassNotFoundException, InstantiationException, + IllegalAccessException, IOException, NoSuchMethodException, InvocationTargetException { + + if (args.length != 1) { + throw new Error("Test Bug: Expected GC type wasn't provided as command line argument"); + } + GC gc = GC.valueOf(args[0]); + + Path wrkDir = Paths.get(""); + URL[] url = {wrkDir.toUri().toURL()}; + URLClassLoader urlLoader = new URLClassLoader(url); + + Class simpleClassLoaderClass = urlLoader.loadClass(SIMPLE_CLASSLOADER_NAME); + + ClassLoader simpleClassLoader = (ClassLoader) simpleClassLoaderClass + .getConstructor(java.lang.ClassLoader.class) + .newInstance(TestHumongousClassLoader.class.getClassLoader()); + + // Sanity check + Asserts.assertEquals(WB.g1IsHumongous(simpleClassLoader), false, + "Test Bug: simpleClassLoader is expected to be non-humongous but it's humongous"); + + + Class humongousClassLoaderClass = simpleClassLoader.loadClass(HUMONGOUS_CLASSLOADER_NAME); + + ClassLoader humongousClassLoader = (ClassLoader) humongousClassLoaderClass + .getConstructor(java.lang.ClassLoader.class) + .newInstance(simpleClassLoader); + + // Sanity check + Asserts.assertEquals(WB.g1IsHumongous(humongousClassLoader), true, + "Test Bug: humongousClassLoader is expected to be humongous but it's non-humongous"); + + //Asserts.assertEquals(1,0); + + Object[] loadedClasses = new Object[]{ + G1SampleClass.LARGEST_NON_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) + .newInstance(), + G1SampleClass.SMALLEST_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) + .newInstance(), + G1SampleClass.ONE_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) + .newInstance(), + G1SampleClass.TWO_REGION_HUMONGOUS.getCls(humongousClassLoader, wrkDir, SAMPLE_CLASS_NAME_PREFIX) + .newInstance(), + }; + + // forgetting references to loaded classes + for (int i = 0; i < loadedClasses.length; ++i) { + loadedClasses[i] = null; + } + + // forgetting referencies to classloaders + humongousClassLoader = null; + humongousClassLoaderClass = null; + + simpleClassLoader = null; + simpleClassLoaderClass = null; + + gc.provoke(); + + // Test checks + Asserts.assertEquals(WB.isClassAlive(HUMONGOUS_CLASSLOADER_NAME), false, + String.format("Classloader class %s is loaded after we forget all references to it", + HUMONGOUS_CLASSLOADER_NAME)); + + for (G1SampleClass sampleClass : G1SampleClass.values()) { + String className = Helpers.enumNameToClassName(sampleClass.name()) + "Class"; + Asserts.assertEquals(WB.isClassAlive(className), false, + String.format("Class %s is loaded after we forget all references to it", className)); + } + } + +}