58 lines
2.4 KiB
Java
58 lines
2.4 KiB
Java
/*
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* Copyright (c) 2014, 2019, 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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*/
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.IllegalClassFormatException;
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import java.security.ProtectionDomain;
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// Note: Util is from /test/hotspot/jtreg/runtime/cds/appcds/test-classes/TestCommon.java
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public class InstrumentationClassFileTransformer implements ClassFileTransformer {
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public byte[] transform(ClassLoader loader, String name, Class<?> classBeingRedefined,
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ProtectionDomain pd, byte[] buffer) throws IllegalClassFormatException {
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if (name.startsWith("InstrumentationApp$") && !name.equals("InstrumentationApp$NotTransformed")) {
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System.out.println("Transforming: " + name + " class = " + classBeingRedefined);
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try {
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if (classBeingRedefined == null) {
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// Initial transform
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replace(buffer, "buzz", "fuzz");
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} else {
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replace(buffer, "buzz", "guzz"); // Retransform
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replace(buffer, "huzz", "quzz"); // Redefine
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}
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} catch (Throwable t) {
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t.printStackTrace();
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}
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return buffer;
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}
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return null;
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}
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static void replace(byte[] buffer, String from, String to) {
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int n = Util.replace(buffer, from, to);
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System.out.println("..... replaced " + n + " occurrence(s) of '" + from + "' to '" + to + "'");
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}
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}
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