1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/gc/metaspace/G1AddMetaspaceDependency.java Wed Apr 10 13:27:35 2013 +0200
1.3 @@ -0,0 +1,123 @@
1.4 +/*
1.5 + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + */
1.26 +
1.27 +/*
1.28 + * @test G1AddMetaspaceDependency
1.29 + * @bug 8010196
1.30 + * @summary Checks that we don't get locking problems when adding metaspace dependencies with the G1 update buffer monitor
1.31 + * @run main/othervm -XX:+UseG1GC -XX:G1UpdateBufferSize=1 G1AddMetaspaceDependency
1.32 + */
1.33 +
1.34 +import java.io.InputStream;
1.35 +
1.36 +public class G1AddMetaspaceDependency {
1.37 +
1.38 + static byte[] getClassBytes(String name) {
1.39 + byte[] b = null;
1.40 + try (InputStream is = ClassLoader.getSystemResourceAsStream(name)) {
1.41 + byte[] tmp = new byte[is.available()];
1.42 + is.read(tmp);
1.43 + b = tmp;
1.44 + } finally {
1.45 + if (b == null) {
1.46 + throw new RuntimeException("Unable to load class file");
1.47 + }
1.48 + return b;
1.49 + }
1.50 + }
1.51 +
1.52 + static final String a_name = G1AddMetaspaceDependency.class.getName() + "$A";
1.53 + static final String b_name = G1AddMetaspaceDependency.class.getName() + "$B";
1.54 +
1.55 + public static void main(String... args) throws Exception {
1.56 + final byte[] a_bytes = getClassBytes(a_name + ".class");
1.57 + final byte[] b_bytes = getClassBytes(b_name + ".class");
1.58 +
1.59 + for (int i = 0; i < 1000; i += 1) {
1.60 + runTest(a_bytes, b_bytes);
1.61 + }
1.62 + }
1.63 +
1.64 + static class Loader extends ClassLoader {
1.65 + private final String myClass;
1.66 + private final byte[] myBytes;
1.67 + private final String friendClass;
1.68 + private final ClassLoader friendLoader;
1.69 +
1.70 + Loader(String myClass, byte[] myBytes,
1.71 + String friendClass, ClassLoader friendLoader) {
1.72 + this.myClass = myClass;
1.73 + this.myBytes = myBytes;
1.74 + this.friendClass = friendClass;
1.75 + this.friendLoader = friendLoader;
1.76 + }
1.77 +
1.78 + Loader(String myClass, byte[] myBytes) {
1.79 + this(myClass, myBytes, null, null);
1.80 + }
1.81 +
1.82 + @Override
1.83 + public Class<?> loadClass(String name) throws ClassNotFoundException {
1.84 + Class<?> c = findLoadedClass(name);
1.85 + if (c != null) {
1.86 + return c;
1.87 + }
1.88 +
1.89 + if (name.equals(friendClass)) {
1.90 + return friendLoader.loadClass(name);
1.91 + }
1.92 +
1.93 + if (name.equals(myClass)) {
1.94 + c = defineClass(name, myBytes, 0, myBytes.length);
1.95 + resolveClass(c);
1.96 + return c;
1.97 + }
1.98 +
1.99 + return findSystemClass(name);
1.100 + }
1.101 +
1.102 + }
1.103 +
1.104 + private static void runTest(final byte[] a_bytes, final byte[] b_bytes) throws Exception {
1.105 + Loader a_loader = new Loader(a_name, a_bytes);
1.106 + Loader b_loader = new Loader(b_name, b_bytes, a_name, a_loader);
1.107 + Loader c_loader = new Loader(b_name, b_bytes, a_name, a_loader);
1.108 + Loader d_loader = new Loader(b_name, b_bytes, a_name, a_loader);
1.109 + Loader e_loader = new Loader(b_name, b_bytes, a_name, a_loader);
1.110 + Loader f_loader = new Loader(b_name, b_bytes, a_name, a_loader);
1.111 + Loader g_loader = new Loader(b_name, b_bytes, a_name, a_loader);
1.112 +
1.113 + byte[] b = new byte[20 * 2 << 20];
1.114 + Class<?> c;
1.115 + c = b_loader.loadClass(b_name);
1.116 + c = c_loader.loadClass(b_name);
1.117 + c = d_loader.loadClass(b_name);
1.118 + c = e_loader.loadClass(b_name);
1.119 + c = f_loader.loadClass(b_name);
1.120 + c = g_loader.loadClass(b_name);
1.121 + }
1.122 + public class A {
1.123 + }
1.124 + class B extends A {
1.125 + }
1.126 +}
