1/* 2 * Copyright (c) 2016, 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 24package gc.g1.humongousObjects; 25 26import gc.testlibrary.Helpers; 27 28import java.io.IOException; 29import java.nio.file.Path; 30import java.nio.file.Paths; 31 32/** 33 * Generates non-humongous and humongous class loaders. 34 * Since the generation depends on current host architecture it cannot be done as part of pre-compilation step 35 */ 36public class ClassLoaderGenerator { 37 public static void main(String[] args) throws IOException { 38 39 if (args.length != 1) { 40 throw new Error("Test Bug: Expected region size wasn't provided as command line argument"); 41 } 42 43 long regionSize = Long.parseLong(args[0]) * 1024 * 1024; 44 45 Path wrkDir = Paths.get(""); 46 generateClassLoader(regionSize, wrkDir); 47 48 } 49 50 public static void generateClassLoader(long regionSize, Path wrkDir) throws IOException { 51 // Generating simple classloader 52 String finalSimpleClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE 53 .replace("${Methods}", 54 TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE 55 .replace("${ClassLoadFilter}", 56 "fileName.equals(\"" + TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME 57 + "\")")) 58 .replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER) 59 .replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE); 60 61 Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME, "ClassLoader", 62 finalSimpleClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE, regionSize / 4, 63 wrkDir, TestHumongousClassLoader.SIMPLE_CLASSLOADER_NAME + "Base"); 64 65 66 // Preparations for generating humongous classloader 67 68 // Generating condition for loadClass method of generated class loader 69 // We want the generated class loader to load only classes from G1SampleClass enum 70 // All other classes should be loaded by parent classloader 71 // As result we get full loadClass method 72 StringBuilder classesToLoadBuilder = new StringBuilder(); 73 for (G1SampleClass g1SampleClass : G1SampleClass.values()) { 74 if (classesToLoadBuilder.length() != 0) { 75 classesToLoadBuilder.append(" || "); 76 } 77 classesToLoadBuilder.append("fileName.startsWith(\"" + Helpers.enumNameToClassName(g1SampleClass.name()) 78 + "\")"); 79 } 80 81 // Generating final class loader prototype - with specified methods,header and constructor 82 String finalHumongousClassLoaderPrototype = TestHumongousClassLoader.GENERIC_PROTOTYPE 83 .replace("${Methods}", 84 TestHumongousClassLoader.LOAD_CLASS_METHOD_PROTOTYPE 85 .replace("${ClassLoadFilter}", classesToLoadBuilder)) 86 .replace("${ClassHeader}", TestHumongousClassLoader.CLASS_HEADER) 87 .replace("${ConstructorClause}", TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE); 88 89 90 // Generating humongous classloader with specified name, base class, final class prototype and 91 // constructor prototype for filler classes 92 // Generated class instance should be humongous since we specify size of (regionSize * 3 / 4) 93 Helpers.generateByTemplateAndCompile(TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME, "ClassLoader", 94 finalHumongousClassLoaderPrototype, TestHumongousClassLoader.CONSTUCTOR_PROTOTYPE, 95 regionSize * 3 / 4, 96 wrkDir, TestHumongousClassLoader.HUMONGOUS_CLASSLOADER_NAME + "Base"); 97 98 99 } 100} 101