| /* |
| * Copyright (c) 2014, 2017, 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.IllegalClassFormatException; |
| import java.security.ProtectionDomain; |
| |
| // Note: Util is from /test/hotspot/jtreg/runtime/appcds/test-classes/TestCommon.java |
| |
| public class InstrumentationClassFileTransformer implements ClassFileTransformer { |
| public byte[] transform(ClassLoader loader, String name, Class<?> classBeingRedefined, |
| ProtectionDomain pd, byte[] buffer) throws IllegalClassFormatException { |
| |
| if (name.startsWith("InstrumentationApp$") && !name.equals("InstrumentationApp$NotTransformed")) { |
| System.out.println("Transforming: " + name + " class = " + classBeingRedefined); |
| try { |
| if (classBeingRedefined == null) { |
| // Initial transform |
| replace(buffer, "buzz", "fuzz"); |
| } else { |
| replace(buffer, "buzz", "guzz"); // Retransform |
| replace(buffer, "huzz", "quzz"); // Redefine |
| } |
| } catch (Throwable t) { |
| t.printStackTrace(); |
| } |
| return buffer; |
| } |
| return null; |
| } |
| |
| static void replace(byte[] buffer, String from, String to) { |
| int n = Util.replace(buffer, from, to); |
| System.out.println("..... replaced " + n + " occurrence(s) of '" + from + "' to '" + to + "'"); |
| } |
| } |