| /* |
| * Copyright (c) 2019, Red Hat, Inc. 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. |
| */ |
| |
| /** |
| * @test TestClasses |
| * @key gc |
| * @requires vm.gc.Epsilon & !vm.graal.enabled |
| * @summary Epsilon is able to allocate a lot of classes, resizing Metaspace |
| * |
| * @modules java.base/jdk.internal.org.objectweb.asm |
| * java.base/jdk.internal.misc |
| * |
| * @run main/othervm -Xmx1g -XX:MetaspaceSize=1m -XX:MaxMetaspaceSize=64m -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xlog:gc -Xlog:gc+metaspace TestClasses |
| */ |
| |
| import jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| |
| import java.util.*; |
| import java.io.*; |
| import java.nio.*; |
| import java.nio.file.*; |
| |
| public class TestClasses { |
| |
| static final int CLASSES = 1024; |
| static final int FIELDS = 1024; |
| |
| static volatile Object sink; |
| |
| static class MyClassLoader extends ClassLoader { |
| static final String[] FIELD_NAMES; |
| static { |
| FIELD_NAMES = new String[FIELDS]; |
| for (int c = 0; c < FIELDS; c++) { |
| FIELD_NAMES[c] = "f" + c; |
| } |
| } |
| |
| public byte[] createClass(String name) { |
| ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES); |
| cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, name, null, "java/lang/Object", null); |
| for (String fName : FIELD_NAMES) { |
| cw.visitField(Opcodes.ACC_STATIC | Opcodes.ACC_PRIVATE, fName, "J", null, null); |
| } |
| return cw.toByteArray(); |
| } |
| |
| public Class<?> loadClass(String name) throws ClassNotFoundException { |
| if (!name.startsWith("Dummy")) { |
| return super.loadClass(name); |
| } |
| byte[] cls = createClass(name); |
| return defineClass(name, cls, 0, cls.length, null); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| ClassLoader cl = new MyClassLoader(); |
| for (int c = 0; c < CLASSES; c++) { |
| Class<?> clazz = Class.forName("Dummy" + c, true, cl); |
| if (clazz.getClassLoader() != cl) { |
| throw new IllegalStateException("Should have loaded by target loader"); |
| } |
| sink = c; |
| } |
| } |
| } |