Mercurial > hg > truffle
view test/runtime/RedefineObject/Agent.java @ 18673:db8ce7ad932b
Merge with 449583258a1575ecc8e498103770eea2a3972fff
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Fri, 12 Dec 2014 15:57:35 -0800 |
parents | 89152779163c |
children |
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/* * Copyright (c) 2013, 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. */ import java.security.*; import java.lang.instrument.*; import java.lang.reflect.*; public class Agent implements ClassFileTransformer { public synchronized byte[] transform(final ClassLoader classLoader, final String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) { System.out.println("Transforming class " + className); return classfileBuffer; } public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) { try { instrumentation.retransformClasses(to_redefine); } catch (Exception e) { e.printStackTrace(); } } public static void premain(String agentArgs, Instrumentation instrumentation) { Agent transformer = new Agent(); instrumentation.addTransformer(transformer, true); // Redefine java/lang/Object and java/lang/reflect/Method.invoke and // java/lang/ClassLoader Class object_class = Object.class; redefine(agentArgs, instrumentation, object_class); Class method_class = Method.class; redefine(agentArgs, instrumentation, method_class); Class loader_class = ClassLoader.class; redefine(agentArgs, instrumentation, loader_class); instrumentation.removeTransformer(transformer); } public static void main(String[] args) { byte[] ba = new byte[0]; // If it survives 1000 GC's, it's good. for (int i = 0; i < 1000 ; i++) { System.gc(); ba.clone(); } try { // Use java/lang/reflect/Method.invoke to call WalkThroughInvoke a = new WalkThroughInvoke(); Class aclass = WalkThroughInvoke.class; Method m = aclass.getMethod("stackWalk"); m.invoke(a); } catch (Exception x) { x.printStackTrace(); } } }