Mercurial > hg > graal-jvmci-8
view test/testlibrary/RedefineClassHelper.java @ 23541:29d7e9b9878b
Added tag jdk8u72-b08 for changeset f26ad2273cd4
author | asaha |
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date | Mon, 09 Nov 2015 13:51:13 -0800 |
parents | 3e5e398431a8 |
children |
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/* * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import java.io.PrintWriter; import java.lang.instrument.*; import com.oracle.java.testlibrary.*; /* * Helper class to write tests that redefine classes. * When main method is run, it will create a redefineagent.jar that can be used * with the -javaagent option to support redefining classes in jtreg tests. * * See sample test in test/testlibrary_tests/RedefineClassTest.java */ public class RedefineClassHelper { public static Instrumentation instrumentation; public static void premain(String agentArgs, Instrumentation inst) { instrumentation = inst; } /** * Redefine a class * * @param clazz Class to redefine * @param javacode String with the new java code for the class to be redefined */ public static void redefineClass(Class clazz, String javacode) throws Exception { byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode); redefineClass(clazz, bytecode); } /** * Redefine a class * * @param clazz Class to redefine * @param bytecode byte[] with the new class */ public static void redefineClass(Class clazz, byte[] bytecode) throws Exception { instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode)); } /** * Main method to be invoked before test to create the redefineagent.jar */ public static void main(String[] args) throws Exception { ClassFileInstaller.main("RedefineClassHelper"); PrintWriter pw = new PrintWriter("MANIFEST.MF"); pw.println("Premain-Class: RedefineClassHelper"); pw.println("Can-Redefine-Classes: true"); pw.close(); sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar"); if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) { throw new Exception("jar operation failed"); } } }