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 //
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 }
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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(1); // 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("-help") || arg.equals("-h")) {
60 usage(0);
61 }
62 else if (arg.equals("-F")) {
63 useSA = true;
64 }
65 else {
66 if (arg.equals("-m")) {
67 mixed = true;
68 } else {
69 if (arg.equals("-l")) {
70 locks = true;
71 } else {
72 usage(1);
73 }
74 }
75 }
76 optionCount++;
77 }
78
79 // mixed stack implies SA tool
80 if (mixed) {
81 useSA = true;
82 }
83
84 // Next we check the parameter count. If there are two parameters
85 // we assume core file and executable so we use SA.
86 int paramCount = args.length - optionCount;
87 if (paramCount == 0 || paramCount > 2) {
88 usage(1);
89 }
90 if (paramCount == 2) {
91 useSA = true;
92 } else {
93 // If we can't parse it as a pid then it must be debug server
94 if (!args[optionCount].matches("[0-9]+")) {
95 useSA = true;
96 }
97 }
98
99 // now execute using the SA JStack tool or the built-in thread dumper
100 if (useSA) {
101 // parameters (<pid> or <exe> <core>
102 String params[] = new String[paramCount];
103 for (int i=optionCount; i<args.length; i++ ){
104 params[i-optionCount] = args[i];
105 }
106 runJStackTool(mixed, locks, params);
107 } else {
108 // pass -l to thread dump operation to get extra lock info
109 String pid = args[optionCount];
110 String params[];
111 if (locks) {
112 params = new String[] { "-l" };
113 } else {
114 params = new String[0];
115 }
116 runThreadDump(pid, params);
117 }
118 }
119
120
121 // SA JStack tool
122 private static void runJStackTool(boolean mixed, boolean locks, String args[]) throws Exception {
123 Class<?> cl = loadSAClass();
124 if (cl == null) {
125 usage(1); // SA not available
126 }
127
128 // JStack tool also takes -m and -l arguments
129 if (mixed) {
130 args = prepend("-m", args);
131 }
132 if (locks) {
133 args = prepend("-l", args);
134 }
135
136 Class[] argTypes = { String[].class };
137 Method m = cl.getDeclaredMethod("main", argTypes);
138
139 Object[] invokeArgs = { args };
140 m.invoke(null, invokeArgs);
141 }
142
143 // Returns sun.jvm.hotspot.tools.JStack if available, otherwise null.
144 private static Class<?> loadSAClass() {
145 //
186 do {
187 n = in.read(b);
188 if (n > 0) {
189 String s = new String(b, 0, n, "UTF-8");
190 System.out.print(s);
191 }
192 } while (n > 0);
193 in.close();
194 vm.detach();
195 }
196
197 // return a new string array with arg as the first element
198 private static String[] prepend(String arg, String args[]) {
199 String[] newargs = new String[args.length+1];
200 newargs[0] = arg;
201 System.arraycopy(args, 0, newargs, 1, args.length);
202 return newargs;
203 }
204
205 // print usage message
206 private static void usage(int exit) {
207 System.err.println("Usage:");
208 System.err.println(" jstack [-l] <pid>");
209 System.err.println(" (to connect to running process)");
210
211 if (loadSAClass() != null) {
212 System.err.println(" jstack -F [-m] [-l] <pid>");
213 System.err.println(" (to connect to a hung process)");
214 System.err.println(" jstack [-m] [-l] <executable> <core>");
215 System.err.println(" (to connect to a core file)");
216 System.err.println(" jstack [-m] [-l] [server_id@]<remote server IP or hostname>");
217 System.err.println(" (to connect to a remote debug server)");
218 }
219
220 System.err.println("");
221 System.err.println("Options:");
222
223 if (loadSAClass() != null) {
224 System.err.println(" -F to force a thread dump. Use when jstack <pid> does not respond" +
225 " (process is hung)");
226 System.err.println(" -m to print both java and native frames (mixed mode)");
227 }
228
229 System.err.println(" -l long listing. Prints additional information about locks");
230 System.err.println(" -h or -help to print this help message");
231 System.exit(exit);
232 }
233 }
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