88 lines
3.0 KiB
Java
88 lines
3.0 KiB
Java
/*
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* Copyright (c) 2019, Red Hat, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.epsilon;
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/**
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* @test TestClasses
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* @requires vm.gc.Epsilon
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* @summary Epsilon is able to allocate a lot of classes, resizing Metaspace
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*
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* @modules java.base/jdk.internal.org.objectweb.asm
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* java.base/jdk.internal.misc
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*
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* @run main/othervm -Xmx256m
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* -XX:MetaspaceSize=1m -XX:MaxMetaspaceSize=64m -Xlog:gc -Xlog:gc+metaspace
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* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
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* gc.epsilon.TestClasses
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*/
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.Opcodes;
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public class TestClasses {
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static final int CLASSES = 1024;
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static final int FIELDS = 1024;
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static volatile Object sink;
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static class MyClassLoader extends ClassLoader {
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static final String[] FIELD_NAMES;
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static {
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FIELD_NAMES = new String[FIELDS];
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for (int c = 0; c < FIELDS; c++) {
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FIELD_NAMES[c] = "f" + c;
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}
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}
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public byte[] createClass(String name) {
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ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
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cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, name, null, "java/lang/Object", null);
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for (String fName : FIELD_NAMES) {
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cw.visitField(Opcodes.ACC_STATIC | Opcodes.ACC_PRIVATE, fName, "J", null, null);
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}
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return cw.toByteArray();
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}
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public Class<?> loadClass(String name) throws ClassNotFoundException {
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if (!name.startsWith("Dummy")) {
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return super.loadClass(name);
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}
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byte[] cls = createClass(name);
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return defineClass(name, cls, 0, cls.length, null);
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}
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}
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public static void main(String[] args) throws Exception {
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ClassLoader cl = new MyClassLoader();
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for (int c = 0; c < CLASSES; c++) {
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Class<?> clazz = Class.forName("Dummy" + c, true, cl);
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if (clazz.getClassLoader() != cl) {
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throw new IllegalStateException("Should have loaded by target loader");
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}
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sink = c;
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}
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}
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}
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