1 /* 2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.internal.instrument; 27 28 import java.util.ArrayList; 29 import java.util.List; 30 31 import jdk.internal.access.JavaNioAccess.BufferPool; 32 import jdk.internal.misc.VM; 33 34 import jdk.jfr.Event; 35 import jdk.jfr.events.ActiveRecordingEvent; 36 import jdk.jfr.events.ActiveSettingEvent; 37 import jdk.jfr.events.DirectMemoryStatisticsEvent; 38 import jdk.jfr.events.ErrorThrownEvent; 39 import jdk.jfr.events.ExceptionStatisticsEvent; 40 import jdk.jfr.events.ExceptionThrownEvent; 41 import jdk.jfr.events.FileForceEvent; 42 import jdk.jfr.events.FileReadEvent; 43 import jdk.jfr.events.FileWriteEvent; 44 import jdk.jfr.events.SecurityPropertyModificationEvent; 45 import jdk.jfr.events.SocketReadEvent; 46 import jdk.jfr.events.SocketWriteEvent; 47 import jdk.jfr.events.TLSHandshakeEvent; 48 import jdk.jfr.events.X509CertificateEvent; 49 import jdk.jfr.events.X509ValidationEvent; 50 import jdk.jfr.internal.JVM; 51 import jdk.jfr.internal.LogLevel; 52 import jdk.jfr.internal.LogTag; 53 import jdk.jfr.internal.Logger; 54 import jdk.jfr.internal.RequestEngine; 55 import jdk.jfr.internal.SecuritySupport; 56 57 public final class JDKEvents { 58 59 private static final Class<?>[] mirrorEventClasses = { 60 SecurityPropertyModificationEvent.class, 61 TLSHandshakeEvent.class, 62 X509CertificateEvent.class, 63 X509ValidationEvent.class 64 }; 65 66 private static final Class<?>[] eventClasses = { 67 FileForceEvent.class, 68 FileReadEvent.class, 69 FileWriteEvent.class, 70 SocketReadEvent.class, 71 SocketWriteEvent.class, 72 ExceptionThrownEvent.class, 73 ExceptionStatisticsEvent.class, 74 ErrorThrownEvent.class, 75 ActiveSettingEvent.class, 76 ActiveRecordingEvent.class, 77 jdk.internal.event.SecurityPropertyModificationEvent.class, 78 jdk.internal.event.TLSHandshakeEvent.class, 79 jdk.internal.event.X509CertificateEvent.class, 80 jdk.internal.event.X509ValidationEvent.class, 81 DirectMemoryStatisticsEvent.class 82 }; 83 84 // This is a list of the classes with instrumentation code that should be applied. 85 private static final Class<?>[] instrumentationClasses = new Class<?>[] { 86 FileInputStreamInstrumentor.class, 87 FileOutputStreamInstrumentor.class, 88 RandomAccessFileInstrumentor.class, 89 FileChannelImplInstrumentor.class, 90 SocketInputStreamInstrumentor.class, 91 SocketOutputStreamInstrumentor.class, 92 SocketChannelImplInstrumentor.class 93 }; 94 95 private static final Class<?>[] targetClasses = new Class<?>[instrumentationClasses.length]; 96 private static final JVM jvm = JVM.getJVM(); 97 private static final Runnable emitExceptionStatistics = JDKEvents::emitExceptionStatistics; 98 private static final Runnable emitDirectMemoryStatistics = JDKEvents::emitDirectMemoryStatistics; 99 private static boolean initializationTriggered; 100 101 @SuppressWarnings("unchecked") 102 public synchronized static void initialize() { 103 try { 104 if (initializationTriggered == false) { 105 for (Class<?> mirrorEventClass : mirrorEventClasses) { 106 SecuritySupport.registerMirror(((Class<? extends Event>)mirrorEventClass)); 107 } 108 for (Class<?> eventClass : eventClasses) { 109 SecuritySupport.registerEvent((Class<? extends Event>) eventClass); 110 } 111 initializationTriggered = true; 112 RequestEngine.addTrustedJDKHook(ExceptionStatisticsEvent.class, emitExceptionStatistics); 113 RequestEngine.addTrustedJDKHook(DirectMemoryStatisticsEvent.class, emitDirectMemoryStatistics); 114 } 115 } catch (Exception e) { 116 Logger.log(LogTag.JFR_SYSTEM, LogLevel.WARN, "Could not initialize JDK events. " + e.getMessage()); 117 } 118 } 119 120 public static void addInstrumentation() { 121 try { 122 List<Class<?>> list = new ArrayList<>(); 123 for (int i = 0; i < instrumentationClasses.length; i++) { 124 JIInstrumentationTarget tgt = instrumentationClasses[i].getAnnotation(JIInstrumentationTarget.class); 125 Class<?> clazz = Class.forName(tgt.value()); 126 targetClasses[i] = clazz; 127 list.add(clazz); 128 } 129 list.add(java.lang.Throwable.class); 130 list.add(java.lang.Error.class); 131 Logger.log(LogTag.JFR_SYSTEM, LogLevel.INFO, "Retransformed JDK classes"); 132 jvm.retransformClasses(list.toArray(new Class<?>[list.size()])); 133 } catch (IllegalStateException ise) { 134 throw ise; 135 } catch (Exception e) { 136 Logger.log(LogTag.JFR_SYSTEM, LogLevel.WARN, "Could not add instrumentation for JDK events. " + e.getMessage()); 137 } 138 } 139 140 private static void emitExceptionStatistics() { 141 ExceptionStatisticsEvent t = new ExceptionStatisticsEvent(); 142 t.throwables = ThrowableTracer.numThrowables(); 143 t.commit(); 144 } 145 146 @SuppressWarnings("deprecation") 147 public static byte[] retransformCallback(Class<?> klass, byte[] oldBytes) throws Throwable { 148 if (java.lang.Throwable.class == klass) { 149 Logger.log(LogTag.JFR_SYSTEM, LogLevel.TRACE, "Instrumenting java.lang.Throwable"); 150 return ConstructorTracerWriter.generateBytes(java.lang.Throwable.class, oldBytes); 151 } 152 153 if (java.lang.Error.class == klass) { 154 Logger.log(LogTag.JFR_SYSTEM, LogLevel.TRACE, "Instrumenting java.lang.Error"); 155 return ConstructorTracerWriter.generateBytes(java.lang.Error.class, oldBytes); 156 } 157 158 for (int i = 0; i < targetClasses.length; i++) { 159 if (targetClasses[i].equals(klass)) { 160 Class<?> c = instrumentationClasses[i]; 161 Logger.log(LogTag.JFR_SYSTEM, LogLevel.TRACE, () -> "Processing instrumentation class: " + c); 162 return new JIClassInstrumentation(instrumentationClasses[i], klass, oldBytes).getNewBytes(); 163 } 164 } 165 return oldBytes; 166 } 167 168 public static void remove() { 169 RequestEngine.removeHook(JDKEvents::emitExceptionStatistics); 170 RequestEngine.removeHook(emitDirectMemoryStatistics); 171 } 172 173 private static final BufferPool DIRECT_BUFFER_POOL = VM.getBufferPools().stream() 174 .filter(p -> "direct".equals(p.getName())) 175 .findFirst().get(); 176 177 private static void emitDirectMemoryStatistics() { 178 DirectMemoryStatisticsEvent e = new DirectMemoryStatisticsEvent(); 179 e.count = DIRECT_BUFFER_POOL.getCount(); 180 e.totalCapacity = DIRECT_BUFFER_POOL.getTotalCapacity(); 181 e.memoryUsed = DIRECT_BUFFER_POOL.getMemoryUsed(); 182 e.maxCapacity = VM.maxDirectMemory(); 183 e.commit(); 184 } 185 }