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annotate test/runtime/RedefineObject/Agent.java @ 17524:89152779163c

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Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
children
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1 /*
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89152779163c Merge with jdk8-b132
Gilles Duboscq <duboscq@ssw.jku.at>
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 import java.security.*;
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24 import java.lang.instrument.*;
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25 import java.lang.reflect.*;
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26
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27 public class Agent implements ClassFileTransformer {
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28 public synchronized byte[] transform(final ClassLoader classLoader,
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29 final String className,
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30 Class<?> classBeingRedefined,
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31 ProtectionDomain protectionDomain,
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32 byte[] classfileBuffer) {
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33 System.out.println("Transforming class " + className);
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34 return classfileBuffer;
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35 }
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36
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37 public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
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38
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39 try {
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40 instrumentation.retransformClasses(to_redefine);
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41 } catch (Exception e) {
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42 e.printStackTrace();
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43 }
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44
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45 }
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46
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47 public static void premain(String agentArgs, Instrumentation instrumentation) {
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48 Agent transformer = new Agent();
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49 instrumentation.addTransformer(transformer, true);
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50
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51 // Redefine java/lang/Object and java/lang/reflect/Method.invoke and
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52 // java/lang/ClassLoader
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53 Class object_class = Object.class;
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54 redefine(agentArgs, instrumentation, object_class);
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55
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56 Class method_class = Method.class;
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57 redefine(agentArgs, instrumentation, method_class);
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58
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59 Class loader_class = ClassLoader.class;
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60 redefine(agentArgs, instrumentation, loader_class);
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61
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62 instrumentation.removeTransformer(transformer);
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63 }
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64
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65 public static void main(String[] args) {
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66 byte[] ba = new byte[0];
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67
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68 // If it survives 1000 GC's, it's good.
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69 for (int i = 0; i < 1000 ; i++) {
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70 System.gc();
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71 ba.clone();
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72 }
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73 try {
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74 // Use java/lang/reflect/Method.invoke to call
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75 WalkThroughInvoke a = new WalkThroughInvoke();
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76 Class aclass = WalkThroughInvoke.class;
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77 Method m = aclass.getMethod("stackWalk");
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78 m.invoke(a);
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79 } catch (Exception x) {
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80 x.printStackTrace();
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81 }
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82 }
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83 }