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test/gc/metaspace/G1AddMetaspaceDependency.java@8c95980d0b66 (annotated)

test/gc/metaspace/G1AddMetaspaceDependency.java

Sat, 07 Nov 2020 10:30:02 +0800

author

aoqi

date

Sat, 07 Nov 2020 10:30:02 +0800

changeset 10026

8c95980d0b66

parent 7994

04ff2f6cd0eb

permissions

-rw-r--r--

Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f

aoqi@0	1	/*
jwilhelm@7785	2	* Copyright (c) 2013, 2014, 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
jwilhelm@7785	27	* @requires vm.gc=="G1" | vm.gc=="null"
aoqi@0	28	* @summary Checks that we don't get locking problems when adding metaspace dependencies with the G1 update buffer monitor
aoqi@0	29	* @run main/othervm -XX:+UseG1GC -XX:G1UpdateBufferSize=1 G1AddMetaspaceDependency
aoqi@0	30	*/
aoqi@0	31
aoqi@0	32	import java.io.InputStream;
aoqi@0	33
aoqi@0	34	public class G1AddMetaspaceDependency {
aoqi@0	35
aoqi@0	36	static byte[] getClassBytes(String name) {
aoqi@0	37	byte[] b = null;
aoqi@0	38	try (InputStream is = ClassLoader.getSystemResourceAsStream(name)) {
aoqi@0	39	byte[] tmp = new byte[is.available()];
aoqi@0	40	is.read(tmp);
aoqi@0	41	b = tmp;
aoqi@0	42	} finally {
aoqi@0	43	if (b == null) {
aoqi@0	44	throw new RuntimeException("Unable to load class file");
aoqi@0	45	}
aoqi@0	46	return b;
aoqi@0	47	}
aoqi@0	48	}
aoqi@0	49
aoqi@0	50	static final String a_name = G1AddMetaspaceDependency.class.getName() + "$A";
aoqi@0	51	static final String b_name = G1AddMetaspaceDependency.class.getName() + "$B";
aoqi@0	52
aoqi@0	53	public static void main(String... args) throws Exception {
aoqi@0	54	final byte[] a_bytes = getClassBytes(a_name + ".class");
aoqi@0	55	final byte[] b_bytes = getClassBytes(b_name + ".class");
aoqi@0	56
aoqi@0	57	for (int i = 0; i < 1000; i += 1) {
aoqi@0	58	runTest(a_bytes, b_bytes);
aoqi@0	59	}
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	static class Loader extends ClassLoader {
aoqi@0	63	private final String myClass;
aoqi@0	64	private final byte[] myBytes;
aoqi@0	65	private final String friendClass;
aoqi@0	66	private final ClassLoader friendLoader;
aoqi@0	67
aoqi@0	68	Loader(String myClass, byte[] myBytes,
aoqi@0	69	String friendClass, ClassLoader friendLoader) {
aoqi@0	70	this.myClass = myClass;
aoqi@0	71	this.myBytes = myBytes;
aoqi@0	72	this.friendClass = friendClass;
aoqi@0	73	this.friendLoader = friendLoader;
aoqi@0	74	}
aoqi@0	75
aoqi@0	76	Loader(String myClass, byte[] myBytes) {
aoqi@0	77	this(myClass, myBytes, null, null);
aoqi@0	78	}
aoqi@0	79
aoqi@0	80	@Override
aoqi@0	81	public Class<?> loadClass(String name) throws ClassNotFoundException {
aoqi@0	82	Class<?> c = findLoadedClass(name);
aoqi@0	83	if (c != null) {
aoqi@0	84	return c;
aoqi@0	85	}
aoqi@0	86
aoqi@0	87	if (name.equals(friendClass)) {
aoqi@0	88	return friendLoader.loadClass(name);
aoqi@0	89	}
aoqi@0	90
aoqi@0	91	if (name.equals(myClass)) {
aoqi@0	92	c = defineClass(name, myBytes, 0, myBytes.length);
aoqi@0	93	resolveClass(c);
aoqi@0	94	return c;
aoqi@0	95	}
aoqi@0	96
aoqi@0	97	return findSystemClass(name);
aoqi@0	98	}
aoqi@0	99
aoqi@0	100	}
aoqi@0	101
aoqi@0	102	private static void runTest(final byte[] a_bytes, final byte[] b_bytes) throws Exception {
aoqi@0	103	Loader a_loader = new Loader(a_name, a_bytes);
aoqi@0	104	Loader b_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	105	Loader c_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	106	Loader d_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	107	Loader e_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	108	Loader f_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	109	Loader g_loader = new Loader(b_name, b_bytes, a_name, a_loader);
aoqi@0	110
aoqi@0	111	Class<?> c;
aoqi@0	112	c = b_loader.loadClass(b_name);
aoqi@0	113	c = c_loader.loadClass(b_name);
aoqi@0	114	c = d_loader.loadClass(b_name);
aoqi@0	115	c = e_loader.loadClass(b_name);
aoqi@0	116	c = f_loader.loadClass(b_name);
aoqi@0	117	c = g_loader.loadClass(b_name);
aoqi@0	118	}
aoqi@0	119	public class A {
aoqi@0	120	}
aoqi@0	121	class B extends A {
aoqi@0	122	}
aoqi@0	123	}