3ed98222a7
Move tests out of runtime to jvmti/RedefineClasses Reviewed-by: sspitsyn, dcubed, cjplummer, hseigel, mseledtsov
84 lines
3.1 KiB
Java
84 lines
3.1 KiB
Java
/*
|
|
* Copyright (c) 2013, 2019, 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.security.*;
|
|
import java.lang.instrument.*;
|
|
import java.lang.reflect.*;
|
|
|
|
public class Agent implements ClassFileTransformer {
|
|
public synchronized byte[] transform(final ClassLoader classLoader,
|
|
final String className,
|
|
Class<?> classBeingRedefined,
|
|
ProtectionDomain protectionDomain,
|
|
byte[] classfileBuffer) {
|
|
System.out.println("Transforming class " + className);
|
|
return classfileBuffer;
|
|
}
|
|
|
|
public static void redefine(String agentArgs, Instrumentation instrumentation, Class to_redefine) {
|
|
|
|
try {
|
|
instrumentation.retransformClasses(to_redefine);
|
|
} catch (Exception e) {
|
|
e.printStackTrace();
|
|
}
|
|
|
|
}
|
|
|
|
public static void premain(String agentArgs, Instrumentation instrumentation) {
|
|
Agent transformer = new Agent();
|
|
instrumentation.addTransformer(transformer, true);
|
|
|
|
// Redefine java/lang/Object and java/lang/reflect/Method.invoke and
|
|
// java/lang/ClassLoader
|
|
Class object_class = Object.class;
|
|
redefine(agentArgs, instrumentation, object_class);
|
|
|
|
Class method_class = Method.class;
|
|
redefine(agentArgs, instrumentation, method_class);
|
|
|
|
Class loader_class = ClassLoader.class;
|
|
redefine(agentArgs, instrumentation, loader_class);
|
|
|
|
instrumentation.removeTransformer(transformer);
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
byte[] ba = new byte[0];
|
|
|
|
// If it survives 100 GC's, it's good.
|
|
for (int i = 0; i < 100 ; i++) {
|
|
System.gc();
|
|
ba.clone();
|
|
}
|
|
try {
|
|
// Use java/lang/reflect/Method.invoke to call
|
|
WalkThroughInvoke a = new WalkThroughInvoke();
|
|
Class aclass = WalkThroughInvoke.class;
|
|
Method m = aclass.getMethod("stackWalk");
|
|
m.invoke(a);
|
|
} catch (Exception x) {
|
|
x.printStackTrace();
|
|
}
|
|
}
|
|
}
|