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test/runtime/RedefineObject/Agent.java@f90c822e73f8 (annotated)

test/runtime/RedefineObject/Agent.java

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

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	import java.security.*;
aoqi@0	24	import java.lang.instrument.*;
aoqi@0	25	import java.lang.reflect.*;
aoqi@0	26
aoqi@0	27	public class Agent implements ClassFileTransformer {
aoqi@0	28	public synchronized byte[] transform(final ClassLoader classLoader,
aoqi@0	29	final String className,
aoqi@0	30	Class<?> classBeingRedefined,
aoqi@0	31	ProtectionDomain protectionDomain,
aoqi@0	32	byte[] classfileBuffer) {
aoqi@0	33	System.out.println("Transforming class " + className);
aoqi@0	34	return classfileBuffer;
aoqi@0	35	}
aoqi@0	36
aoqi@0	37	public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
aoqi@0	38
aoqi@0	39	try {
aoqi@0	40	instrumentation.retransformClasses(to_redefine);
aoqi@0	41	} catch (Exception e) {
aoqi@0	42	e.printStackTrace();
aoqi@0	43	}
aoqi@0	44
aoqi@0	45	}
aoqi@0	46
aoqi@0	47	public static void premain(String agentArgs, Instrumentation instrumentation) {
aoqi@0	48	Agent transformer = new Agent();
aoqi@0	49	instrumentation.addTransformer(transformer, true);
aoqi@0	50
aoqi@0	51	// Redefine java/lang/Object and java/lang/reflect/Method.invoke and
aoqi@0	52	// java/lang/ClassLoader
aoqi@0	53	Class object_class = Object.class;
aoqi@0	54	redefine(agentArgs, instrumentation, object_class);
aoqi@0	55
aoqi@0	56	Class method_class = Method.class;
aoqi@0	57	redefine(agentArgs, instrumentation, method_class);
aoqi@0	58
aoqi@0	59	Class loader_class = ClassLoader.class;
aoqi@0	60	redefine(agentArgs, instrumentation, loader_class);
aoqi@0	61
aoqi@0	62	instrumentation.removeTransformer(transformer);
aoqi@0	63	}
aoqi@0	64
aoqi@0	65	public static void main(String[] args) {
aoqi@0	66	byte[] ba = new byte[0];
aoqi@0	67
aoqi@0	68	// If it survives 1000 GC's, it's good.
aoqi@0	69	for (int i = 0; i < 1000 ; i++) {
aoqi@0	70	System.gc();
aoqi@0	71	ba.clone();
aoqi@0	72	}
aoqi@0	73	try {
aoqi@0	74	// Use java/lang/reflect/Method.invoke to call
aoqi@0	75	WalkThroughInvoke a = new WalkThroughInvoke();
aoqi@0	76	Class aclass = WalkThroughInvoke.class;
aoqi@0	77	Method m = aclass.getMethod("stackWalk");
aoqi@0	78	m.invoke(a);
aoqi@0	79	} catch (Exception x) {
aoqi@0	80	x.printStackTrace();
aoqi@0	81	}
aoqi@0	82	}
aoqi@0	83	}