| /* |
| * Copyright (c) 2013, 2014, Oracle and/or its affiliates. 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 G1AddMetaspaceDependency |
| * @bug 8010196 |
| * @requires vm.gc=="G1" | vm.gc=="null" |
| * @summary Checks that we don't get locking problems when adding metaspace dependencies with the G1 update buffer monitor |
| * @run main/othervm -XX:+UseG1GC -XX:G1UpdateBufferSize=1 G1AddMetaspaceDependency |
| */ |
| |
| import java.io.InputStream; |
| |
| public class G1AddMetaspaceDependency { |
| |
| static byte[] getClassBytes(String name) { |
| byte[] b = null; |
| try (InputStream is = ClassLoader.getSystemResourceAsStream(name)) { |
| byte[] tmp = new byte[is.available()]; |
| is.read(tmp); |
| b = tmp; |
| } finally { |
| if (b == null) { |
| throw new RuntimeException("Unable to load class file"); |
| } |
| return b; |
| } |
| } |
| |
| static final String a_name = G1AddMetaspaceDependency.class.getName() + "$A"; |
| static final String b_name = G1AddMetaspaceDependency.class.getName() + "$B"; |
| |
| public static void main(String... args) throws Exception { |
| final byte[] a_bytes = getClassBytes(a_name + ".class"); |
| final byte[] b_bytes = getClassBytes(b_name + ".class"); |
| |
| for (int i = 0; i < 1000; i += 1) { |
| runTest(a_bytes, b_bytes); |
| } |
| } |
| |
| static class Loader extends ClassLoader { |
| private final String myClass; |
| private final byte[] myBytes; |
| private final String friendClass; |
| private final ClassLoader friendLoader; |
| |
| Loader(String myClass, byte[] myBytes, |
| String friendClass, ClassLoader friendLoader) { |
| this.myClass = myClass; |
| this.myBytes = myBytes; |
| this.friendClass = friendClass; |
| this.friendLoader = friendLoader; |
| } |
| |
| Loader(String myClass, byte[] myBytes) { |
| this(myClass, myBytes, null, null); |
| } |
| |
| @Override |
| public Class<?> loadClass(String name) throws ClassNotFoundException { |
| Class<?> c = findLoadedClass(name); |
| if (c != null) { |
| return c; |
| } |
| |
| if (name.equals(friendClass)) { |
| return friendLoader.loadClass(name); |
| } |
| |
| if (name.equals(myClass)) { |
| c = defineClass(name, myBytes, 0, myBytes.length); |
| resolveClass(c); |
| return c; |
| } |
| |
| return findSystemClass(name); |
| } |
| |
| } |
| |
| private static void runTest(final byte[] a_bytes, final byte[] b_bytes) throws Exception { |
| Loader a_loader = new Loader(a_name, a_bytes); |
| Loader b_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
| Loader c_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
| Loader d_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
| Loader e_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
| Loader f_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
| Loader g_loader = new Loader(b_name, b_bytes, a_name, a_loader); |
| |
| Class<?> c; |
| c = b_loader.loadClass(b_name); |
| c = c_loader.loadClass(b_name); |
| c = d_loader.loadClass(b_name); |
| c = e_loader.loadClass(b_name); |
| c = f_loader.loadClass(b_name); |
| c = g_loader.loadClass(b_name); |
| } |
| public class A { |
| } |
| class B extends A { |
| } |
| } |