• file
• revisions
• annotate
• diff
• comparison
• raw

test/gc/metaspace/G1AddMetaspaceDependency.java@710a3c8b516e (annotated)

test/gc/metaspace/G1AddMetaspaceDependency.java

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 5815

77a774ab3cf0

parent 0

f90c822e73f8

child 7994

04ff2f6cd0eb

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	/*
aoqi@0	25	* @test G1AddMetaspaceDependency
aoqi@0	26	* @bug 8010196
aoqi@0	27	* @summary Checks that we don't get locking problems when adding metaspace dependencies with the G1 update buffer monitor
aoqi@0	28	* @run main/othervm -XX:+UseG1GC -XX:G1UpdateBufferSize=1 G1AddMetaspaceDependency
aoqi@0	29	*/
aoqi@0	30
aoqi@0	31	import java.io.InputStream;
aoqi@0	32
aoqi@0	33	public class G1AddMetaspaceDependency {
aoqi@0	34
aoqi@0	35	static byte[] getClassBytes(String name) {
aoqi@0	36	byte[] b = null;
aoqi@0	37	try (InputStream is = ClassLoader.getSystemResourceAsStream(name)) {
aoqi@0	38	byte[] tmp = new byte[is.available()];
aoqi@0	39	is.read(tmp);
aoqi@0	40	b = tmp;
aoqi@0	41	} finally {
aoqi@0	42	if (b == null) {
aoqi@0	43	throw new RuntimeException("Unable to load class file");
aoqi@0	44	}
aoqi@0	45	return b;
aoqi@0	46	}
aoqi@0	47	}
aoqi@0	48
aoqi@0	49	static final String a_name = G1AddMetaspaceDependency.class.getName() + "$A";
aoqi@0	50	static final String b_name = G1AddMetaspaceDependency.class.getName() + "$B";
aoqi@0	51
aoqi@0	52	public static void main(String... args) throws Exception {
aoqi@0	53	final byte[] a_bytes = getClassBytes(a_name + ".class");
aoqi@0	54	final byte[] b_bytes = getClassBytes(b_name + ".class");
aoqi@0	55
aoqi@0	56	for (int i = 0; i < 1000; i += 1) {
aoqi@0	57	runTest(a_bytes, b_bytes);
aoqi@0	58	}
aoqi@0	59	}
aoqi@0	60
aoqi@0	61	static class Loader extends ClassLoader {
aoqi@0	62	private final String myClass;
aoqi@0	63	private final byte[] myBytes;
aoqi@0	64	private final String friendClass;
aoqi@0	65	private final ClassLoader friendLoader;
aoqi@0	66
aoqi@0	67	Loader(String myClass, byte[] myBytes,
aoqi@0	68	String friendClass, ClassLoader friendLoader) {
aoqi@0	69	this.myClass = myClass;
aoqi@0	70	this.myBytes = myBytes;
aoqi@0	71	this.friendClass = friendClass;
aoqi@0	72	this.friendLoader = friendLoader;
aoqi@0	73	}
aoqi@0	74
aoqi@0	75	Loader(String myClass, byte[] myBytes) {
aoqi@0	76	this(myClass, myBytes, null, null);
aoqi@0	77	}
aoqi@0	78
aoqi@0	79	@Override
aoqi@0	80	public Class<?> loadClass(String name) throws ClassNotFoundException {
aoqi@0	81	Class<?> c = findLoadedClass(name);
aoqi@0	82	if (c != null) {
aoqi@0	83	return c;
aoqi@0	84	}
aoqi@0	85
aoqi@0	86	if (name.equals(friendClass)) {
aoqi@0	87	return friendLoader.loadClass(name);
aoqi@0	88	}
aoqi@0	89
aoqi@0	90	if (name.equals(myClass)) {
aoqi@0	91	c = defineClass(name, myBytes, 0, myBytes.length);
aoqi@0	92	resolveClass(c);
aoqi@0	93	return c;
aoqi@0	94	}
aoqi@0	95
aoqi@0	96	return findSystemClass(name);
aoqi@0	97	}
aoqi@0	98
aoqi@0	99	}
aoqi@0	100
aoqi@0	101	private static void runTest(final byte[] a_bytes, final byte[] b_bytes) throws Exception {
aoqi@0	102	Loader a_loader = new Loader(a_name, a_bytes);
aoqi@0	103	Loader b_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	104	Loader c_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	105	Loader d_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	106	Loader e_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	107	Loader f_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	108	Loader g_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	109
aoqi@0	110	Class<?> c;
aoqi@0	111	c = b_loader.loadClass(b_name);
aoqi@0	112	c = c_loader.loadClass(b_name);
aoqi@0	113	c = d_loader.loadClass(b_name);
aoqi@0	114	c = e_loader.loadClass(b_name);
aoqi@0	115	c = f_loader.loadClass(b_name);
aoqi@0	116	c = g_loader.loadClass(b_name);
aoqi@0	117	}
aoqi@0	118	public class A {
aoqi@0	119	}
aoqi@0	120	class B extends A {
aoqi@0	121	}
aoqi@0	122	}