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/*
* 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 -Xmx256m
* -XX:MetaspaceSize=1m -XX:MaxMetaspaceSize=64m -Xlog:gc -Xlog:gc+metaspace
* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
* 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;
}
}
}
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