126 lines
3.9 KiB
Java
126 lines
3.9 KiB
Java
/*
|
|
* Copyright (c) 2013, 2019, 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.
|
|
*/
|
|
|
|
package gc.metaspace;
|
|
|
|
/*
|
|
* @test G1AddMetaspaceDependency
|
|
* @bug 8010196
|
|
* @requires vm.gc.G1
|
|
* @library /
|
|
* @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 gc.metaspace.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 = A.class.getName();
|
|
static final String b_name = B.class.getName();
|
|
|
|
public static void main(String... args) throws Exception {
|
|
final byte[] a_bytes = getClassBytes(a_name.replace('.', '/') + ".class");
|
|
final byte[] b_bytes = getClassBytes(b_name.replace('.', '/') + ".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);
|
|
|
|
b_loader.loadClass(b_name);
|
|
c_loader.loadClass(b_name);
|
|
d_loader.loadClass(b_name);
|
|
e_loader.loadClass(b_name);
|
|
f_loader.loadClass(b_name);
|
|
g_loader.loadClass(b_name);
|
|
}
|
|
public class A {
|
|
}
|
|
class B extends A {
|
|
}
|
|
}
|