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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/tools/jstack/JStack.java (1 of 18352 files). Show all

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java/pkg/sun/tools/jstack/JStack.java+229−0
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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
26package sun.tools.jstack;
27
28import java.lang.reflect.Method;
29import java.lang.reflect.Constructor;
30import java.io.IOException;
31import java.io.InputStream;
32
33import com.sun.tools.attach.VirtualMachine;
34import com.sun.tools.attach.AttachNotSupportedException;
35import 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 */
42public 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}