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annotate test/testlibrary/RedefineClassHelper.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents 3e5e398431a8
children
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1 /*
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2 * Copyright (c) 2014, 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
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24 import java.io.PrintWriter;
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25 import java.lang.instrument.*;
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26 import com.oracle.java.testlibrary.*;
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27
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28 /*
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29 * Helper class to write tests that redefine classes.
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30 * When main method is run, it will create a redefineagent.jar that can be used
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31 * with the -javaagent option to support redefining classes in jtreg tests.
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32 *
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33 * See sample test in test/testlibrary_tests/RedefineClassTest.java
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34 */
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35 public class RedefineClassHelper {
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36
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37 public static Instrumentation instrumentation;
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38 public static void premain(String agentArgs, Instrumentation inst) {
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39 instrumentation = inst;
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40 }
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41
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42 /**
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43 * Redefine a class
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44 *
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45 * @param clazz Class to redefine
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46 * @param javacode String with the new java code for the class to be redefined
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47 */
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48 public static void redefineClass(Class clazz, String javacode) throws Exception {
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49 byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode);
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50 redefineClass(clazz, bytecode);
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51 }
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52
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53 /**
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54 * Redefine a class
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55 *
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56 * @param clazz Class to redefine
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57 * @param bytecode byte[] with the new class
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58 */
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59 public static void redefineClass(Class clazz, byte[] bytecode) throws Exception {
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60 instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode));
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61 }
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62
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63 /**
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64 * Main method to be invoked before test to create the redefineagent.jar
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65 */
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66 public static void main(String[] args) throws Exception {
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67 ClassFileInstaller.main("RedefineClassHelper");
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68
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69 PrintWriter pw = new PrintWriter("MANIFEST.MF");
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70 pw.println("Premain-Class: RedefineClassHelper");
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71 pw.println("Can-Redefine-Classes: true");
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72 pw.close();
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73
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74 sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
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75 if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) {
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76 throw new Exception("jar operation failed");
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77 }
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78 }
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79 }