80 lines
2.9 KiB
Java
80 lines
2.9 KiB
Java
/*
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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.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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}
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