85 lines
2.9 KiB
Java
85 lines
2.9 KiB
Java
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. 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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*/
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import java.lang.invoke.MethodType;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
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public class LotsUnloadApp implements Runnable {
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static byte[] classdata;
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static int exitAfterNumClasses = 1024;
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public static void main(String args[]) throws Throwable {
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String resname = DefinedAsHiddenKlass.class.getName() + ".class";
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classdata = LotsUnloadApp.class.getClassLoader().getResourceAsStream(resname).readAllBytes();
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int numThreads = 4;
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try {
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numThreads = Integer.parseInt(args[0]);
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} catch (Throwable t) {}
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try {
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exitAfterNumClasses = Integer.parseInt(args[1]);
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} catch (Throwable t) {}
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for (int i = 0; i < numThreads; i++) {
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Thread t = new Thread(new LotsUnloadApp());
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t.start();
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}
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}
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public void run() {
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while (true) {
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try {
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Lookup lookup = MethodHandles.lookup();
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Class<?> cl = lookup.defineHiddenClass(classdata, false, NESTMATE).lookupClass();
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cl.newInstance();
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add();
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} catch (Throwable t) {
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t.printStackTrace();
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}
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}
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}
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static int n;
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static synchronized void add() {
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n++;
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if (n >= exitAfterNumClasses) {
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System.exit(0);
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}
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}
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}
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class DefinedAsHiddenKlass {
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// ZGC region size is always a multiple of 2MB on x64.
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// Make this slightly smaller than that.
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static byte[] array = new byte[2 * 1024 * 1024 - 8 * 1024];
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static String x;
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public DefinedAsHiddenKlass() {
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// This will generate some lambda forms hidden classes for string concat.
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x = "array size is " + array.length + " bytes ";
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}
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}
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