a25f924de6
ActiveMethodOopsCache was used to keep track of old versions of some methods that are cached in Universe but is buggy with permgen removal and not needed anymore Reviewed-by: sspitsyn, dcubed, mseledtsov
84 lines
3.1 KiB
Java
84 lines
3.1 KiB
Java
/*
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* Copyright (c) 2013, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.security.*;
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import java.lang.instrument.*;
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import java.lang.reflect.*;
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public class Agent implements ClassFileTransformer {
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public synchronized byte[] transform(final ClassLoader classLoader,
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final String className,
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Class<?> classBeingRedefined,
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ProtectionDomain protectionDomain,
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byte[] classfileBuffer) {
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System.out.println("Transforming class " + className);
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return classfileBuffer;
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}
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public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
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try {
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instrumentation.retransformClasses(to_redefine);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public static void premain(String agentArgs, Instrumentation instrumentation) {
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Agent transformer = new Agent();
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instrumentation.addTransformer(transformer, true);
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// Redefine java/lang/Object and java/lang/reflect/Method.invoke and
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// java/lang/ClassLoader
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Class object_class = Object.class;
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redefine(agentArgs, instrumentation, object_class);
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Class method_class = Method.class;
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redefine(agentArgs, instrumentation, method_class);
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Class loader_class = ClassLoader.class;
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redefine(agentArgs, instrumentation, loader_class);
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instrumentation.removeTransformer(transformer);
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}
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public static void main(String[] args) {
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byte[] ba = new byte[0];
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// If it survives 1000 GC's, it's good.
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for (int i = 0; i < 1000 ; i++) {
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System.gc();
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ba.clone();
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}
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try {
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// Use java/lang/reflect/Method.invoke to call
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WalkThroughInvoke a = new WalkThroughInvoke();
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Class aclass = WalkThroughInvoke.class;
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Method m = aclass.getMethod("stackWalk");
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m.invoke(a);
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} catch (Exception x) {
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x.printStackTrace();
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}
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}
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}
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