author | jwilhelm |
Tue, 29 Aug 2017 17:17:58 +0200 | |
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parent 45101 | f00304ce6eb8 |
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/* |
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* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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import java.io.PrintWriter; |
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import java.lang.instrument.*; |
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import jdk.test.lib.compiler.InMemoryJavaCompiler; |
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/* |
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* Helper class to write tests that redefine classes. |
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* When main method is run, it will create a redefineagent.jar that can be used |
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* with the -javaagent option to support redefining classes in jtreg tests. |
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* |
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* See sample test in test/testlibrary_tests/RedefineClassTest.java |
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*/ |
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public class RedefineClassHelper { |
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public static Instrumentation instrumentation; |
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public static void premain(String agentArgs, Instrumentation inst) { |
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instrumentation = inst; |
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} |
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/** |
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* Redefine a class |
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* |
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* @param clazz Class to redefine |
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* @param javacode String with the new java code for the class to be redefined |
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*/ |
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public static void redefineClass(Class clazz, String javacode) throws Exception { |
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byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode); |
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redefineClass(clazz, bytecode); |
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} |
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/** |
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* Redefine a class |
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* |
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* @param clazz Class to redefine |
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* @param bytecode byte[] with the new class |
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*/ |
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public static void redefineClass(Class clazz, byte[] bytecode) throws Exception { |
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instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode)); |
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} |
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/** |
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* Main method to be invoked before test to create the redefineagent.jar |
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*/ |
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public static void main(String[] args) throws Exception { |
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ClassFileInstaller.main("RedefineClassHelper"); |
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PrintWriter pw = new PrintWriter("MANIFEST.MF"); |
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pw.println("Premain-Class: RedefineClassHelper"); |
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pw.println("Can-Redefine-Classes: true"); |
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pw.close(); |
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sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar"); |
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if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) { |
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throw new Exception("jar operation failed"); |
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} |
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} |
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} |