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comparison test/testlibrary/RedefineClassHelper.java @ 23183:3e5e398431a8

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8044364: runtime/RedefineFinalizer test fails on windows Summary: Rewrote the test in pure Java, added RedefineClassHelper utility class Reviewed-by: coleenp, allwin, gtriantafill, dsamersoff
author ctornqvi
date Mon, 02 Jun 2014 19:08:18 +0200
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23182:c2c7fed86a5e 23183:3e5e398431a8
1 /*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.io.PrintWriter;
25 import java.lang.instrument.*;
26 import com.oracle.java.testlibrary.*;
27
28 /*
29 * Helper class to write tests that redefine classes.
30 * When main method is run, it will create a redefineagent.jar that can be used
31 * with the -javaagent option to support redefining classes in jtreg tests.
32 *
33 * See sample test in test/testlibrary_tests/RedefineClassTest.java
34 */
35 public class RedefineClassHelper {
36
37 public static Instrumentation instrumentation;
38 public static void premain(String agentArgs, Instrumentation inst) {
39 instrumentation = inst;
40 }
41
42 /**
43 * Redefine a class
44 *
45 * @param clazz Class to redefine
46 * @param javacode String with the new java code for the class to be redefined
47 */
48 public static void redefineClass(Class clazz, String javacode) throws Exception {
49 byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode);
50 redefineClass(clazz, bytecode);
51 }
52
53 /**
54 * Redefine a class
55 *
56 * @param clazz Class to redefine
57 * @param bytecode byte[] with the new class
58 */
59 public static void redefineClass(Class clazz, byte[] bytecode) throws Exception {
60 instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode));
61 }
62
63 /**
64 * Main method to be invoked before test to create the redefineagent.jar
65 */
66 public static void main(String[] args) throws Exception {
67 ClassFileInstaller.main("RedefineClassHelper");
68
69 PrintWriter pw = new PrintWriter("MANIFEST.MF");
70 pw.println("Premain-Class: RedefineClassHelper");
71 pw.println("Can-Redefine-Classes: true");
72 pw.close();
73
74 sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
75 if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) {
76 throw new Exception("jar operation failed");
77 }
78 }
79 }