1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/testlibrary/RedefineClassHelper.java Mon Jun 02 19:08:18 2014 +0200
1.3 @@ -0,0 +1,79 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + */
1.26 +
1.27 +import java.io.PrintWriter;
1.28 +import java.lang.instrument.*;
1.29 +import com.oracle.java.testlibrary.*;
1.30 +
1.31 +/*
1.32 + * Helper class to write tests that redefine classes.
1.33 + * When main method is run, it will create a redefineagent.jar that can be used
1.34 + * with the -javaagent option to support redefining classes in jtreg tests.
1.35 + *
1.36 + * See sample test in test/testlibrary_tests/RedefineClassTest.java
1.37 + */
1.38 +public class RedefineClassHelper {
1.39 +
1.40 + public static Instrumentation instrumentation;
1.41 + public static void premain(String agentArgs, Instrumentation inst) {
1.42 + instrumentation = inst;
1.43 + }
1.44 +
1.45 + /**
1.46 + * Redefine a class
1.47 + *
1.48 + * @param clazz Class to redefine
1.49 + * @param javacode String with the new java code for the class to be redefined
1.50 + */
1.51 + public static void redefineClass(Class clazz, String javacode) throws Exception {
1.52 + byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode);
1.53 + redefineClass(clazz, bytecode);
1.54 + }
1.55 +
1.56 + /**
1.57 + * Redefine a class
1.58 + *
1.59 + * @param clazz Class to redefine
1.60 + * @param bytecode byte[] with the new class
1.61 + */
1.62 + public static void redefineClass(Class clazz, byte[] bytecode) throws Exception {
1.63 + instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode));
1.64 + }
1.65 +
1.66 + /**
1.67 + * Main method to be invoked before test to create the redefineagent.jar
1.68 + */
1.69 + public static void main(String[] args) throws Exception {
1.70 + ClassFileInstaller.main("RedefineClassHelper");
1.71 +
1.72 + PrintWriter pw = new PrintWriter("MANIFEST.MF");
1.73 + pw.println("Premain-Class: RedefineClassHelper");
1.74 + pw.println("Can-Redefine-Classes: true");
1.75 + pw.close();
1.76 +
1.77 + sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
1.78 + if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) {
1.79 + throw new Exception("jar operation failed");
1.80 + }
1.81 + }
1.82 +}
