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| 1 | +/* | |
| 2 | + * Copyright (c) 2001, 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 com.sun.tools.example.trace; | |
| 27 | + | |
| 28 | +import com.sun.jdi.VirtualMachine; | |
| 29 | +import com.sun.jdi.Bootstrap; | |
| 30 | +import com.sun.jdi.connect.*; | |
| 31 | + | |
| 32 | +import java.util.Map; | |
| 33 | +import java.util.List; | |
| 34 | + | |
| 35 | +import java.io.PrintWriter; | |
| 36 | +import java.io.FileWriter; | |
| 37 | +import java.io.IOException; | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * This program traces the execution of another program. | |
| 41 | + * See "java Trace -help". | |
| 42 | + * It is a simple example of the use of the Java Debug Interface. | |
| 43 | + * | |
| 44 | + * @author Robert Field | |
| 45 | + */ | |
| 46 | +public class Trace { | |
| 47 | + | |
| 48 | + // Running remote VM | |
| 49 | + private final VirtualMachine vm; | |
| 50 | + | |
| 51 | + // Thread transferring remote error stream to our error stream | |
| 52 | + private Thread errThread = null; | |
| 53 | + | |
| 54 | + // Thread transferring remote output stream to our output stream | |
| 55 | + private Thread outThread = null; | |
| 56 | + | |
| 57 | + // Mode for tracing the Trace program (default= 0 off) | |
| 58 | + private int debugTraceMode = 0; | |
| 59 | + | |
| 60 | + // Do we want to watch assignments to fields | |
| 61 | + private boolean watchFields = false; | |
| 62 | + | |
| 63 | + // Class patterns for which we don't want events | |
| 64 | + private String[] excludes = {"java.*", "javax.*", "sun.*", | |
| 65 | + "com.sun.*"}; | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * main | |
| 69 | + */ | |
| 70 | + public static void main(String[] args) { | |
| 71 | + new Trace(args); | |
| 72 | + } | |
| 73 | + | |
| 74 | + /** | |
| 75 | + * Parse the command line arguments. | |
| 76 | + * Launch target VM. | |
| 77 | + * Generate the trace. | |
| 78 | + */ | |
| 79 | + Trace(String[] args) { | |
| 80 | + PrintWriter writer = new PrintWriter(System.out); | |
| 81 | + int inx; | |
| 82 | + for (inx = 0; inx < args.length; ++inx) { | |
| 83 | + String arg = args[inx]; | |
| 84 | + if (arg.charAt(0) != '-') { | |
| 85 | + break; | |
| 86 | + } | |
| 87 | + if (arg.equals("-output")) { | |
| 88 | + try { | |
| 89 | + writer = new PrintWriter(new FileWriter(args[++inx])); | |
| 90 | + } catch (IOException exc) { | |
| 91 | + System.err.println("Cannot open output file: " + args[inx] | |
| 92 | + + " - " + exc); | |
| 93 | + System.exit(1); | |
| 94 | + } | |
| 95 | + } else if (arg.equals("-all")) { | |
| 96 | + excludes = new String[0]; | |
| 97 | + } else if (arg.equals("-fields")) { | |
| 98 | + watchFields = true; | |
| 99 | + } else if (arg.equals("-dbgtrace")) { | |
| 100 | + debugTraceMode = Integer.parseInt(args[++inx]); | |
| 101 | + } else if (arg.equals("-help")) { | |
| 102 | + usage(); | |
| 103 | + System.exit(0); | |
| 104 | + } else { | |
| 105 | + System.err.println("No option: " + arg); | |
| 106 | + usage(); | |
| 107 | + System.exit(1); | |
| 108 | + } | |
| 109 | + } | |
| 110 | + if (inx >= args.length) { | |
| 111 | + System.err.println("<class> missing"); | |
| 112 | + usage(); | |
| 113 | + System.exit(1); | |
| 114 | + } | |
| 115 | + StringBuffer sb = new StringBuffer(); | |
| 116 | + sb.append(args[inx]); | |
| 117 | + for (++inx; inx < args.length; ++inx) { | |
| 118 | + sb.append(' '); | |
| 119 | + sb.append(args[inx]); | |
| 120 | + } | |
| 121 | + vm = launchTarget(sb.toString()); | |
| 122 | + generateTrace(writer); | |
| 123 | + } | |
| 124 | + | |
| 125 | + | |
| 126 | + /** | |
| 127 | + * Generate the trace. | |
| 128 | + * Enable events, start thread to display events, | |
| 129 | + * start threads to forward remote error and output streams, | |
| 130 | + * resume the remote VM, wait for the final event, and shutdown. | |
| 131 | + */ | |
| 132 | + void generateTrace(PrintWriter writer) { | |
| 133 | + vm.setDebugTraceMode(debugTraceMode); | |
| 134 | + EventThread eventThread = new EventThread(vm, excludes, writer); | |
| 135 | + eventThread.setEventRequests(watchFields); | |
| 136 | + eventThread.start(); | |
| 137 | + redirectOutput(); | |
| 138 | + vm.resume(); | |
| 139 | + | |
| 140 | + // Shutdown begins when event thread terminates | |
| 141 | + try { | |
| 142 | + eventThread.join(); | |
| 143 | + errThread.join(); // Make sure output is forwarded | |
| 144 | + outThread.join(); // before we exit | |
| 145 | + } catch (InterruptedException exc) { | |
| 146 | + // we don't interrupt | |
| 147 | + } | |
| 148 | + writer.close(); | |
| 149 | + } | |
| 150 | + | |
| 151 | + /** | |
| 152 | + * Launch target VM. | |
| 153 | + * Forward target's output and error. | |
| 154 | + */ | |
| 155 | + VirtualMachine launchTarget(String mainArgs) { | |
| 156 | + LaunchingConnector connector = findLaunchingConnector(); | |
| 157 | + Map<String, Connector.Argument> arguments = | |
| 158 | + connectorArguments(connector, mainArgs); | |
| 159 | + try { | |
| 160 | + return connector.launch(arguments); | |
| 161 | + } catch (IOException exc) { | |
| 162 | + throw new Error("Unable to launch target VM: " + exc); | |
| 163 | + } catch (IllegalConnectorArgumentsException exc) { | |
| 164 | + throw new Error("Internal error: " + exc); | |
| 165 | + } catch (VMStartException exc) { | |
| 166 | + throw new Error("Target VM failed to initialize: " + | |
| 167 | + exc.getMessage()); | |
| 168 | + } | |
| 169 | + } | |
| 170 | + | |
| 171 | + void redirectOutput() { | |
| 172 | + Process process = vm.process(); | |
| 173 | + | |
| 174 | + // Copy target's output and error to our output and error. | |
| 175 | + errThread = new StreamRedirectThread("error reader", | |
| 176 | + process.getErrorStream(), | |
| 177 | + System.err); | |
| 178 | + outThread = new StreamRedirectThread("output reader", | |
| 179 | + process.getInputStream(), | |
| 180 | + System.out); | |
| 181 | + errThread.start(); | |
| 182 | + outThread.start(); | |
| 183 | + } | |
| 184 | + | |
| 185 | + /** | |
| 186 | + * Find a com.sun.jdi.CommandLineLaunch connector | |
| 187 | + */ | |
| 188 | + LaunchingConnector findLaunchingConnector() { | |
| 189 | + List<Connector> connectors = Bootstrap.virtualMachineManager().allConnectors(); | |
| 190 | + for (Connector connector : connectors) { | |
| 191 | + if (connector.name().equals("com.sun.jdi.CommandLineLaunch")) { | |
| 192 | + return (LaunchingConnector)connector; | |
| 193 | + } | |
| 194 | + } | |
| 195 | + throw new Error("No launching connector"); | |
| 196 | + } | |
| 197 | + | |
| 198 | + /** | |
| 199 | + * Return the launching connector's arguments. | |
| 200 | + */ | |
| 201 | + Map<String, Connector.Argument> connectorArguments(LaunchingConnector connector, String mainArgs) { | |
| 202 | + Map<String, Connector.Argument> arguments = connector.defaultArguments(); | |
| 203 | + Connector.Argument mainArg = | |
| 204 | + (Connector.Argument)arguments.get("main"); | |
| 205 | + if (mainArg == null) { | |
| 206 | + throw new Error("Bad launching connector"); | |
| 207 | + } | |
| 208 | + mainArg.setValue(mainArgs); | |
| 209 | + | |
| 210 | + if (watchFields) { | |
| 211 | + // We need a VM that supports watchpoints | |
| 212 | + Connector.Argument optionArg = | |
| 213 | + (Connector.Argument)arguments.get("options"); | |
| 214 | + if (optionArg == null) { | |
| 215 | + throw new Error("Bad launching connector"); | |
| 216 | + } | |
| 217 | + optionArg.setValue("-classic"); | |
| 218 | + } | |
| 219 | + return arguments; | |
| 220 | + } | |
| 221 | + | |
| 222 | + /** | |
| 223 | + * Print command line usage help | |
| 224 | + */ | |
| 225 | + void usage() { | |
| 226 | + System.err.println("Usage: java Trace <options> <class> <args>"); | |
| 227 | + System.err.println("<options> are:"); | |
| 228 | + System.err.println( | |
| 229 | +" -output <filename> Output trace to <filename>"); | |
| 230 | + System.err.println( | |
| 231 | +" -all Include system classes in output"); | |
| 232 | + System.err.println( | |
| 233 | +" -help Print this help message"); | |
| 234 | + System.err.println("<class> is the program to trace"); | |
| 235 | + System.err.println("<args> are the arguments to <class>"); | |
| 236 | + } | |
| 237 | +} | |