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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, 2006, 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 sun.tools.jstack; | |
| 27 | + | |
| 28 | +import java.lang.reflect.Method; | |
| 29 | +import java.lang.reflect.Constructor; | |
| 30 | +import java.io.IOException; | |
| 31 | +import java.io.InputStream; | |
| 32 | + | |
| 33 | +import com.sun.tools.attach.VirtualMachine; | |
| 34 | +import com.sun.tools.attach.AttachNotSupportedException; | |
| 35 | +import sun.tools.attach.HotSpotVirtualMachine; | |
| 36 | + | |
| 37 | +/* | |
| 38 | + * This class is the main class for the JStack utility. It parses its arguments | |
| 39 | + * and decides if the command should be executed by the SA JStack tool or by | |
| 40 | + * obtained the thread dump from a target process using the VM attach mechanism | |
| 41 | + */ | |
| 42 | +public class JStack { | |
| 43 | + public static void main(String[] args) throws Exception { | |
| 44 | + if (args.length == 0) { | |
| 45 | + usage(); // no arguments | |
| 46 | + } | |
| 47 | + | |
| 48 | + boolean useSA = false; | |
| 49 | + boolean mixed = false; | |
| 50 | + boolean locks = false; | |
| 51 | + | |
| 52 | + // Parse the options (arguments starting with "-" ) | |
| 53 | + int optionCount = 0; | |
| 54 | + while (optionCount < args.length) { | |
| 55 | + String arg = args[optionCount]; | |
| 56 | + if (!arg.startsWith("-")) { | |
| 57 | + break; | |
| 58 | + } | |
| 59 | + if (arg.equals("-F")) { | |
| 60 | + useSA = true; | |
| 61 | + } else { | |
| 62 | + if (arg.equals("-m")) { | |
| 63 | + mixed = true; | |
| 64 | + } else { | |
| 65 | + if (arg.equals("-l")) { | |
| 66 | + locks = true; | |
| 67 | + } else { | |
| 68 | + usage(); | |
| 69 | + } | |
| 70 | + } | |
| 71 | + } | |
| 72 | + optionCount++; | |
| 73 | + } | |
| 74 | + | |
| 75 | + // mixed stack implies SA tool | |
| 76 | + if (mixed) { | |
| 77 | + useSA = true; | |
| 78 | + } | |
| 79 | + | |
| 80 | + // Next we check the parameter count. If there are two parameters | |
| 81 | + // we assume core file and executable so we use SA. | |
| 82 | + int paramCount = args.length - optionCount; | |
| 83 | + if (paramCount == 0 || paramCount > 2) { | |
| 84 | + usage(); | |
| 85 | + } | |
| 86 | + if (paramCount == 2) { | |
| 87 | + useSA = true; | |
| 88 | + } else { | |
| 89 | + // If we can't parse it as a pid then it must be debug server | |
| 90 | + if (!args[optionCount].matches("[0-9]+")) { | |
| 91 | + useSA = true; | |
| 92 | + } | |
| 93 | + } | |
| 94 | + | |
| 95 | + // now execute using the SA JStack tool or the built-in thread dumper | |
| 96 | + if (useSA) { | |
| 97 | + // parameters (<pid> or <exe> <core> | |
| 98 | + String params[] = new String[paramCount]; | |
| 99 | + for (int i=optionCount; i<args.length; i++ ){ | |
| 100 | + params[i-optionCount] = args[i]; | |
| 101 | + } | |
| 102 | + runJStackTool(mixed, locks, params); | |
| 103 | + } else { | |
| 104 | + // pass -l to thread dump operation to get extra lock info | |
| 105 | + String pid = args[optionCount]; | |
| 106 | + String params[]; | |
| 107 | + if (locks) { | |
| 108 | + params = new String[] { "-l" }; | |
| 109 | + } else { | |
| 110 | + params = new String[0]; | |
| 111 | + } | |
| 112 | + runThreadDump(pid, params); | |
| 113 | + } | |
| 114 | + } | |
| 115 | + | |
| 116 | + | |
| 117 | + // SA JStack tool | |
| 118 | + private static void runJStackTool(boolean mixed, boolean locks, String args[]) throws Exception { | |
| 119 | + Class<?> cl = loadSAClass(); | |
| 120 | + if (cl == null) { | |
| 121 | + usage(); // SA not available | |
| 122 | + } | |
| 123 | + | |
| 124 | + // JStack tool also takes -m and -l arguments | |
| 125 | + if (mixed) { | |
| 126 | + args = prepend("-m", args); | |
| 127 | + } | |
| 128 | + if (locks) { | |
| 129 | + args = prepend("-l", args); | |
| 130 | + } | |
| 131 | + | |
| 132 | + Class[] argTypes = { String[].class }; | |
| 133 | + Method m = cl.getDeclaredMethod("main", argTypes); | |
| 134 | + | |
| 135 | + Object[] invokeArgs = { args }; | |
| 136 | + m.invoke(null, invokeArgs); | |
| 137 | + } | |
| 138 | + | |
| 139 | + // Returns sun.jvm.hotspot.tools.JStack if available, otherwise null. | |
| 140 | + private static Class loadSAClass() { | |
| 141 | + // | |
| 142 | + // Attempt to load JStack class - we specify the system class | |
| 143 | + // loader so as to cater for development environments where | |
| 144 | + // this class is on the boot class path but sa-jdi.jar is on | |
| 145 | + // the system class path. Once the JDK is deployed then both | |
| 146 | + // tools.jar and sa-jdi.jar are on the system class path. | |
| 147 | + // | |
| 148 | + try { | |
| 149 | + return Class.forName("sun.jvm.hotspot.tools.JStack", true, | |
| 150 | + ClassLoader.getSystemClassLoader()); | |
| 151 | + } catch (Exception x) { } | |
| 152 | + return null; | |
| 153 | + } | |
| 154 | + | |
| 155 | + // Attach to pid and perform a thread dump | |
| 156 | + private static void runThreadDump(String pid, String args[]) throws Exception { | |
| 157 | + VirtualMachine vm = null; | |
| 158 | + try { | |
| 159 | + vm = VirtualMachine.attach(pid); | |
| 160 | + } catch (Exception x) { | |
| 161 | + String msg = x.getMessage(); | |
| 162 | + if (msg != null) { | |
| 163 | + System.err.println(pid + ": " + msg); | |
| 164 | + } else { | |
| 165 | + x.printStackTrace(); | |
| 166 | + } | |
| 167 | + if ((x instanceof AttachNotSupportedException) && | |
| 168 | + (loadSAClass() != null)) { | |
| 169 | + System.err.println("The -F option can be used when the target " + | |
| 170 | + "process is not responding"); | |
| 171 | + } | |
| 172 | + System.exit(1); | |
| 173 | + } | |
| 174 | + | |
| 175 | + // Cast to HotSpotVirtualMachine as this is implementation specific | |
| 176 | + // method. | |
| 177 | + InputStream in = ((HotSpotVirtualMachine)vm).remoteDataDump((Object[])args); | |
| 178 | + | |
| 179 | + // read to EOF and just print output | |
| 180 | + byte b[] = new byte[256]; | |
| 181 | + int n; | |
| 182 | + do { | |
| 183 | + n = in.read(b); | |
| 184 | + if (n > 0) { | |
| 185 | + String s = new String(b, 0, n, "UTF-8"); | |
| 186 | + System.out.print(s); | |
| 187 | + } | |
| 188 | + } while (n > 0); | |
| 189 | + in.close(); | |
| 190 | + vm.detach(); | |
| 191 | + } | |
| 192 | + | |
| 193 | + // return a new string array with arg as the first element | |
| 194 | + private static String[] prepend(String arg, String args[]) { | |
| 195 | + String[] newargs = new String[args.length+1]; | |
| 196 | + newargs[0] = arg; | |
| 197 | + System.arraycopy(args, 0, newargs, 1, args.length); | |
| 198 | + return newargs; | |
| 199 | + } | |
| 200 | + | |
| 201 | + // print usage message | |
| 202 | + private static void usage() { | |
| 203 | + System.out.println("Usage:"); | |
| 204 | + System.out.println(" jstack [-l] <pid>"); | |
| 205 | + System.out.println(" (to connect to running process)"); | |
| 206 | + | |
| 207 | + if (loadSAClass() != null) { | |
| 208 | + System.out.println(" jstack -F [-m] [-l] <pid>"); | |
| 209 | + System.out.println(" (to connect to a hung process)"); | |
| 210 | + System.out.println(" jstack [-m] [-l] <executable> <core>"); | |
| 211 | + System.out.println(" (to connect to a core file)"); | |
| 212 | + System.out.println(" jstack [-m] [-l] [server_id@]<remote server IP or hostname>"); | |
| 213 | + System.out.println(" (to connect to a remote debug server)"); | |
| 214 | + } | |
| 215 | + | |
| 216 | + System.out.println(""); | |
| 217 | + System.out.println("Options:"); | |
| 218 | + | |
| 219 | + if (loadSAClass() != null) { | |
| 220 | + System.out.println(" -F to force a thread dump. Use when jstack <pid> does not respond" + | |
| 221 | + " (process is hung)"); | |
| 222 | + System.out.println(" -m to print both java and native frames (mixed mode)"); | |
| 223 | + } | |
| 224 | + | |
| 225 | + System.out.println(" -l long listing. Prints additional information about locks"); | |
| 226 | + System.out.println(" -h or -help to print this help message"); | |
| 227 | + System.exit(1); | |
| 228 | + } | |
| 229 | +} | |