--- /dev/null 2016-08-31 13:31:03.627382942 -0700 +++ new/test/testlibrary/jvmti/TransformerAgent.java 2016-09-13 21:50:56.168806778 -0700 @@ -0,0 +1,99 @@ +/* + * Copyright (c) 2016, 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.lang.instrument.ClassFileTransformer; +import java.lang.instrument.Instrumentation; +import java.lang.instrument.IllegalClassFormatException; +import java.security.ProtectionDomain; +import java.util.HashMap; + +// This is a test ulitilty class used to transform +// specified classes via initial transformation (CFLH). +// Names of classes to be transformed are supplied as arguments, +// the phrase to be transformed is a hard-coded predefined +// fairly unique phrase. + +public class TransformerAgent { + private static String[] classesToTransform; + + + private static void log(String msg) { + System.out.println("TransformerAgent: " + msg); + } + + + // arguments are comma-separated list of classes to transform + public static void premain(String agentArguments, Instrumentation instrumentation) { + log("premain() is called, arguments = " + agentArguments); + classesToTransform = agentArguments.split(","); + instrumentation.addTransformer(new SimpleTransformer(), /*canRetransform=*/true); + } + + + public static void agentmain(String args, Instrumentation inst) throws Exception { + log("agentmain() is called"); + premain(args, inst); + } + + + static class SimpleTransformer implements ClassFileTransformer { + public byte[] transform(ClassLoader loader, String name, Class classBeingRedefined, + ProtectionDomain pd, byte[] buffer) throws IllegalClassFormatException { + + log("SimpleTransformer called for: " + name + "@" + incrCounter(name)); + if (!shouldTransform(name)) + return null; + + log("transforming: class name = " + name); + int nrOfReplacements = TransformUtil.replace(buffer, "this-should-be-transformed", "this-has-been--transformed"); + log("replaced the string, nrOfReplacements = " + nrOfReplacements); + return buffer; + } + + // Check class name pattern, since test should only transform certain classes + private static boolean shouldTransform(String name) { + for (String match : classesToTransform) { + if (name.matches(match)) { + log("shouldTransform: match-found, match = " + match); + return true; + } + } + + return false; + } + } + + + static HashMap counterMap = new HashMap<>(); + + static Integer incrCounter(String className) { + Integer i = counterMap.get(className); + if (i == null) { + i = new Integer(1); + } else { + i = new Integer(i.intValue() + 1); + } + counterMap.put(className, i); + return i; + } +}