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/*
* Copyright (c) 2005, 2015, 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.
*/
/**
* @test
* @bug 6263319
* @requires ((vm.opt.StartFlightRecording == null) | (vm.opt.StartFlightRecording == false)) & ((vm.opt.FlightRecorder == null) | (vm.opt.FlightRecorder == false))
* @summary test setNativeMethodPrefix
* @author Robert Field, Sun Microsystems
*
* @modules java.base/jdk.internal.org.objectweb.asm
* java.management
* java.instrument
* @run shell/timeout=240 MakeJAR2.sh NativeMethodPrefixAgent NativeMethodPrefixApp 'Can-Retransform-Classes: true' 'Can-Set-Native-Method-Prefix: true'
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:-CheckIntrinsics -javaagent:NativeMethodPrefixAgent.jar NativeMethodPrefixApp
*/
import java.lang.instrument.*;
import java.security.ProtectionDomain;
import java.io.*;
import asmlib.*;
class NativeMethodPrefixAgent {
static ClassFileTransformer t0, t1, t2;
static Instrumentation inst;
static class Tr implements ClassFileTransformer {
final String trname;
final int transformId;
Tr(int transformId) {
this.trname = "tr" + transformId;
this.transformId = transformId;
}
public byte[]
transform(
ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer) {
boolean redef = classBeingRedefined != null;
System.out.println(trname + ": " +
(redef? "Retransforming " : "Loading ") + className);
if (className != null) {
try {
byte[] newcf = Instrumentor.instrFor(classfileBuffer)
.addNativeMethodTrackingInjection(
"wrapped_" + trname + "_",
(h)->{
h.push(h.getName());
h.push(transformId);
h.invokeStatic("bootreporter/StringIdCallbackReporter", "tracker", "(Ljava/lang/String;I)V", false);
})
.apply();
/*** debugging ...
if (newcf != null) {
String fname = trname + (redef?"_redef" : "") + "/" + className;
System.err.println("dumping to: " + fname);
write_buffer(fname + "_before.class", classfileBuffer);
write_buffer(fname + "_instr.class", newcf);
}
***/
return redef? null : newcf;
} catch (Throwable ex) {
System.err.println("ERROR: Injection failure: " + ex);
ex.printStackTrace();
System.err.println("Returning bad class file, to cause test failure");
return new byte[0];
}
}
return null;
}
}
// for debugging
static void write_buffer(String fname, byte[]buffer) {
try {
File f = new File(fname);
if (!f.getParentFile().exists()) {
f.getParentFile().mkdirs();
}
try (FileOutputStream outStream = new FileOutputStream(f)) {
outStream.write(buffer, 0, buffer.length);
}
} catch (IOException ex) {
System.err.println("EXCEPTION in write_buffer: " + ex);
}
}
public static void
premain (String agentArgs, Instrumentation instArg)
throws IOException, IllegalClassFormatException,
ClassNotFoundException, UnmodifiableClassException {
inst = instArg;
System.out.println("Premain");
t1 = new Tr(1);
t2 = new Tr(2);
t0 = new Tr(0);
inst.addTransformer(t1, true);
inst.addTransformer(t2, false);
inst.addTransformer(t0, true);
instArg.setNativeMethodPrefix(t0, "wrapped_tr0_");
instArg.setNativeMethodPrefix(t1, "wrapped_tr1_");
instArg.setNativeMethodPrefix(t2, "wrapped_tr2_");
// warm up: cause load of transformer classes before used during class load
instArg.retransformClasses(Runtime.class);
}
}
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