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/*
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* Copyright (c) 2016, 2018, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package jdk.jfr.internal;
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import java.lang.reflect.Modifier;
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import jdk.jfr.Event;
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import jdk.jfr.internal.handlers.EventHandler;
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import jdk.jfr.internal.instrument.JDKEvents;
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/**
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* All upcalls from the JVM should go through this class.
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*
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*/
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// Called by native
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final class JVMUpcalls {
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/**
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* Called by the JVM when a retransform happens on a tagged class
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*
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* @param traceId
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* Id of the class
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* @param dummy
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* (not used but needed since invoke infrastructure in native
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* uses same signature bytesForEagerInstrumentation)
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* @param clazz
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* class being retransformed
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* @param oldBytes
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* byte code
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* @return byte code to use
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* @throws Throwable
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*/
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static byte[] onRetransform(long traceId, boolean dummy, Class<?> clazz, byte[] oldBytes) throws Throwable {
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try {
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if (Event.class.isAssignableFrom(clazz) && !Modifier.isAbstract(clazz.getModifiers())) {
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EventHandler handler = Utils.getHandler(clazz.asSubclass(Event.class));
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if (handler == null) {
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Logger.log(LogTag.JFR_SYSTEM, LogLevel.INFO, "No event handler found for " + clazz.getName() + ". Ignoring instrumentation request.");
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// Probably triggered by some other agent
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return oldBytes;
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}
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Logger.log(LogTag.JFR_SYSTEM, LogLevel.INFO, "Adding instrumentation to event class " + clazz.getName() + " using retransform");
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EventInstrumentation ei = new EventInstrumentation(clazz.getSuperclass(), oldBytes, traceId);
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byte[] bytes = ei.buildInstrumented();
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ASMToolkit.logASM(clazz.getName(), bytes);
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return bytes;
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}
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return JDKEvents.retransformCallback(clazz, oldBytes);
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} catch (Throwable t) {
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Logger.log(LogTag.JFR_SYSTEM, LogLevel.WARN, "Unexpected error when adding instrumentation to event class " + clazz.getName());
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}
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return oldBytes;
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}
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/**
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* Called by the JVM when requested to do an "eager" instrumentation. Would
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* normally happen when JVMTI retransform capabilities are not available.
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*
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* @param traceId
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* Id of the class
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* @param forceInstrumentation
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* add instrumentation regardless if event is enabled or not.
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* @param superClazz
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* the super class of the class being processed
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* @param oldBytes
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* byte code
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* @return byte code to use
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* @throws Throwable
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*/
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static byte[] bytesForEagerInstrumentation(long traceId, boolean forceInstrumentation, Class<?> superClass, byte[] oldBytes) throws Throwable {
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if (JVMSupport.isNotAvailable()) {
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return oldBytes;
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}
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String eventName = "<Unknown>";
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try {
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EventInstrumentation ei = new EventInstrumentation(superClass, oldBytes, traceId);
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eventName = ei.getEventName();
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if (!forceInstrumentation) {
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// Assume we are recording
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MetadataRepository mr = MetadataRepository.getInstance();
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// No need to generate bytecode if:
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// 1) Event class is disabled, and there is not an external configuration that overrides.
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// 2) Event class has @Registered(false)
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if (!mr.isEnabled(ei.getEventName()) && !ei.isEnabled() || !ei.isRegistered()) {
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Logger.log(LogTag.JFR_SYSTEM, LogLevel.INFO, "Skipping instrumentation for event type " + eventName + " since event was disabled on class load");
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return oldBytes;
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}
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}
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// Corner case when we are forced to generate bytecode. We can't reference the event
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// handler in #isEnabled() before event class has been registered, so we add a
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// guard against a null reference.
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ei.setGuardHandler(true);
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Logger.log(LogTag.JFR_SYSTEM, LogLevel.INFO, "Adding " + (forceInstrumentation ? "forced " : "") + "instrumentation for event type " + eventName + " during initial class load");
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EventHandlerCreator eh = new EventHandlerCreator(traceId, ei.getSettingInfos(), ei.getFieldInfos());
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// Handler class must be loaded before instrumented event class can
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// be used
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eh.makeEventHandlerClass();
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byte[] bytes = ei.buildInstrumented();
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ASMToolkit.logASM(ei.getClassName() + "(" + traceId + ")", bytes);
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return bytes;
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} catch (Throwable t) {
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Logger.log(LogTag.JFR_SYSTEM, LogLevel.WARN, "Unexpected error when adding instrumentation for event type " + eventName);
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return oldBytes;
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}
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}
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/**
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* Called by the JVM to create the recorder thread.
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*
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* @param systemThreadGroup
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* the system thread group
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*
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* @param contextClassLoader
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* the context class loader.
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*
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* @return a new thread
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*/
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static Thread createRecorderThread(ThreadGroup systemThreadGroup, ClassLoader contextClassLoader) {
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return SecuritySupport.createRecorderThread(systemThreadGroup, contextClassLoader);
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}
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}
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