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comparison src/share/vm/services/diagnosticFramework.cpp @ 4133:3b688d6ff3d0

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7104647: Adding a diagnostic command framework Reviewed-by: phh, dcubed
author fparain
date Wed, 14 Dec 2011 04:30:57 -0800
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children 4f25538b54c9
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4131:e9b91fd07263 4133:3b688d6ff3d0
1 /*
2 * Copyright (c) 2011, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "memory/oopFactory.hpp"
27 #include "runtime/javaCalls.hpp"
28 #include "runtime/mutexLocker.hpp"
29 #include "services/diagnosticArgument.hpp"
30 #include "services/diagnosticFramework.hpp"
31 #include "services/management.hpp"
32
33 CmdLine::CmdLine(const char* line, size_t len, bool no_command_name) {
34 assert(line != NULL, "Command line string should not be NULL");
35 const char* line_end;
36 const char* cmd_end;
37
38 _cmd = line;
39 line_end = &line[len];
40
41 // Skip whitespace in the beginning of the line.
42 while (_cmd < line_end && isspace((int) _cmd[0])) {
43 _cmd++;
44 }
45 cmd_end = _cmd;
46
47 if (no_command_name) {
48 _cmd = NULL;
49 _cmd_len = 0;
50 } else {
51 // Look for end of the command name
52 while (cmd_end < line_end && !isspace((int) cmd_end[0])) {
53 cmd_end++;
54 }
55 _cmd_len = cmd_end - _cmd;
56 }
57 _args = cmd_end;
58 _args_len = line_end - _args;
59 }
60
61 bool DCmdArgIter::next(TRAPS) {
62 if (_len == 0) return false;
63 // skipping spaces
64 while (_cursor < _len - 1 && isspace(_buffer[_cursor])) {
65 _cursor++;
66 }
67 // handling end of command line
68 if (_cursor >= _len - 1) {
69 _cursor = _len - 1;
70 _key_addr = &_buffer[_len - 1];
71 _key_len = 0;
72 _value_addr = &_buffer[_len - 1];
73 _value_len = 0;
74 return false;
75 }
76 // extracting first item, argument or option name
77 _key_addr = &_buffer[_cursor];
78 while (_cursor <= _len - 1 && _buffer[_cursor] != '=' && _buffer[_cursor] != _delim) {
79 // argument can be surrounded by single or double quotes
80 if (_buffer[_cursor] == '\"' || _buffer[_cursor] == '\'') {
81 _key_addr++;
82 char quote = _buffer[_cursor];
83 while (_cursor < _len - 1) {
84 _cursor++;
85 if (_buffer[_cursor] == quote && _buffer[_cursor - 1] != '\\') {
86 break;
87 }
88 }
89 if (_buffer[_cursor] != quote) {
90 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
91 "Format error in diagnostic command arguments", false);
92 }
93 break;
94 }
95 _cursor++;
96 }
97 _key_len = &_buffer[_cursor] - _key_addr;
98 // check if the argument has the <key>=<value> format
99 if (_cursor <= _len -1 && _buffer[_cursor] == '=') {
100 _cursor++;
101 _value_addr = &_buffer[_cursor];
102 // extract the value
103 while (_cursor <= _len - 1 && _buffer[_cursor] != _delim) {
104 // value can be surrounded by simple or double quotes
105 if (_buffer[_cursor] == '\"' || _buffer[_cursor] == '\'') {
106 _value_addr++;
107 char quote = _buffer[_cursor];
108 while (_cursor < _len - 1) {
109 _cursor++;
110 if (_buffer[_cursor] == quote && _buffer[_cursor - 1] != '\\') {
111 break;
112 }
113 }
114 if (_buffer[_cursor] != quote) {
115 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
116 "Format error in diagnostic command arguments", false);
117 }
118 break;
119 }
120 _cursor++;
121 }
122 _value_len = &_buffer[_cursor] - _value_addr;
123 } else {
124 _value_addr = NULL;
125 _value_len = 0;
126 }
127 return _key_len != 0;
128 }
129
130 bool DCmdInfo::by_name(void* cmd_name, DCmdInfo* info) {
131 if (info == NULL) return false;
132 return strcmp((const char*)cmd_name, info->name()) == 0;
133 }
134
135 void DCmdParser::add_dcmd_option(GenDCmdArgument* arg) {
136 assert(arg != NULL, "Sanity");
137 if (_options == NULL) {
138 _options = arg;
139 } else {
140 GenDCmdArgument* o = _options;
141 while (o->next() != NULL) {
142 o = o->next();
143 }
144 o->set_next(arg);
145 }
146 arg->set_next(NULL);
147 Thread* THREAD = Thread::current();
148 arg->init_value(THREAD);
149 if (HAS_PENDING_EXCEPTION) {
150 fatal("Initialization must be successful");
151 }
152 }
153
154 void DCmdParser::add_dcmd_argument(GenDCmdArgument* arg) {
155 assert(arg != NULL, "Sanity");
156 if (_arguments_list == NULL) {
157 _arguments_list = arg;
158 } else {
159 GenDCmdArgument* a = _arguments_list;
160 while (a->next() != NULL) {
161 a = a->next();
162 }
163 a->set_next(arg);
164 }
165 arg->set_next(NULL);
166 Thread* THREAD = Thread::current();
167 arg->init_value(THREAD);
168 if (HAS_PENDING_EXCEPTION) {
169 fatal("Initialization must be successful");
170 }
171 }
172
173 void DCmdParser::parse(CmdLine* line, char delim, TRAPS) {
174 GenDCmdArgument* next_argument = _arguments_list;
175 DCmdArgIter iter(line->args_addr(), line->args_len(), delim);
176 bool cont = iter.next(CHECK);
177 while (cont) {
178 GenDCmdArgument* arg = lookup_dcmd_option(iter.key_addr(),
179 iter.key_length());
180 if (arg != NULL) {
181 arg->read_value(iter.value_addr(), iter.value_length(), CHECK);
182 } else {
183 if (next_argument != NULL) {
184 arg = next_argument;
185 arg->read_value(iter.key_addr(), iter.key_length(), CHECK);
186 next_argument = next_argument->next();
187 } else {
188 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
189 "Unknown argument in diagnostic command");
190 }
191 }
192 cont = iter.next(CHECK);
193 }
194 check(CHECK);
195 }
196
197 GenDCmdArgument* DCmdParser::lookup_dcmd_option(const char* name, size_t len) {
198 GenDCmdArgument* arg = _options;
199 while (arg != NULL) {
200 if (strlen(arg->name()) == len &&
201 strncmp(name, arg->name(), len) == 0) {
202 return arg;
203 }
204 arg = arg->next();
205 }
206 return NULL;
207 }
208
209 void DCmdParser::check(TRAPS) {
210 GenDCmdArgument* arg = _arguments_list;
211 while (arg != NULL) {
212 if (arg->is_mandatory() && !arg->has_value()) {
213 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
214 "Missing argument for diagnostic command");
215 }
216 arg = arg->next();
217 }
218 arg = _options;
219 while (arg != NULL) {
220 if (arg->is_mandatory() && !arg->has_value()) {
221 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
222 "Missing option for diagnostic command");
223 }
224 arg = arg->next();
225 }
226 }
227
228 void DCmdParser::print_help(outputStream* out, const char* cmd_name) {
229 out->print("\nSyntax : %s %s", cmd_name, _options == NULL ? "" : "[options]");
230 GenDCmdArgument* arg = _arguments_list;
231 while (arg != NULL) {
232 if (arg->is_mandatory()) {
233 out->print(" <%s>", arg->name());
234 } else {
235 out->print(" [<%s>]", arg->name());
236 }
237 arg = arg->next();
238 }
239 out->print_cr("");
240 if (_arguments_list != NULL) {
241 out->print_cr("\nArguments:");
242 arg = _arguments_list;
243 while (arg != NULL) {
244 out->print("\t%s : %s %s (%s, ", arg->name(),
245 arg->is_mandatory() ? "" : "[optional]",
246 arg->description(), arg->type());
247 if (arg->has_default()) {
248 out->print(arg->default_string());
249 } else {
250 out->print("no default value");
251 }
252 out->print_cr(")");
253 arg = arg->next();
254 }
255 }
256 if (_options != NULL) {
257 out->print_cr("\nOptions: (options must be specified using the <key> or <key>=<value> syntax)");
258 arg = _options;
259 while (arg != NULL) {
260 out->print("\t%s : %s %s (%s, ", arg->name(),
261 arg->is_mandatory() ? "" : "[optional]",
262 arg->description(), arg->type());
263 if (arg->has_default()) {
264 out->print(arg->default_string());
265 } else {
266 out->print("no default value");
267 }
268 out->print_cr(")");
269 arg = arg->next();
270 }
271 }
272 }
273
274 void DCmdParser::reset(TRAPS) {
275 GenDCmdArgument* arg = _arguments_list;
276 while (arg != NULL) {
277 arg->reset(CHECK);
278 arg = arg->next();
279 }
280 arg = _options;
281 while (arg != NULL) {
282 arg->reset(CHECK);
283 arg = arg->next();
284 }
285 }
286
287 void DCmdParser::cleanup() {
288 GenDCmdArgument* arg = _arguments_list;
289 while (arg != NULL) {
290 arg->cleanup();
291 arg = arg->next();
292 }
293 arg = _options;
294 while (arg != NULL) {
295 arg->cleanup();
296 arg = arg->next();
297 }
298 }
299
300 int DCmdParser::num_arguments() {
301 GenDCmdArgument* arg = _arguments_list;
302 int count = 0;
303 while (arg != NULL) {
304 count++;
305 arg = arg->next();
306 }
307 arg = _options;
308 while (arg != NULL) {
309 count++;
310 arg = arg->next();
311 }
312 return count;
313 }
314
315 GrowableArray<const char *>* DCmdParser::argument_name_array() {
316 int count = num_arguments();
317 GrowableArray<const char *>* array = new GrowableArray<const char *>(count);
318 GenDCmdArgument* arg = _arguments_list;
319 while (arg != NULL) {
320 array->append(arg->name());
321 arg = arg->next();
322 }
323 arg = _options;
324 while (arg != NULL) {
325 array->append(arg->name());
326 arg = arg->next();
327 }
328 return array;
329 }
330
331 GrowableArray<DCmdArgumentInfo*>* DCmdParser::argument_info_array() {
332 int count = num_arguments();
333 GrowableArray<DCmdArgumentInfo*>* array = new GrowableArray<DCmdArgumentInfo *>(count);
334 int idx = 0;
335 GenDCmdArgument* arg = _arguments_list;
336 while (arg != NULL) {
337 array->append(new DCmdArgumentInfo(arg->name(), arg->description(),
338 arg->type(), arg->default_string(), arg->is_mandatory(),
339 false, idx));
340 idx++;
341 arg = arg->next();
342 }
343 arg = _options;
344 while (arg != NULL) {
345 array->append(new DCmdArgumentInfo(arg->name(), arg->description(),
346 arg->type(), arg->default_string(), arg->is_mandatory(),
347 true));
348 arg = arg->next();
349 }
350 return array;
351 }
352
353 DCmdFactory* DCmdFactory::_DCmdFactoryList = NULL;
354
355 void DCmd::parse_and_execute(outputStream* out, const char* cmdline,
356 char delim, TRAPS) {
357
358 if (cmdline == NULL) return; // Nothing to do!
359 DCmdIter iter(cmdline, '\n');
360
361 while (iter.has_next()) {
362 CmdLine line = iter.next();
363 if (line.is_stop()) {
364 break;
365 }
366 if (line.is_executable()) {
367 DCmd* command = DCmdFactory::create_local_DCmd(line, out, CHECK);
368 assert(command != NULL, "command error must be handled before this line");
369 DCmdMark mark(command);
370 command->parse(&line, delim, CHECK);
371 command->execute(CHECK);
372 }
373 }
374 }
375
376 Mutex* DCmdFactory::_dcmdFactory_lock = new Mutex(Mutex::leaf, "DCmdFactory", true);
377
378 DCmdFactory* DCmdFactory::factory(const char* name, size_t len) {
379 MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
380 DCmdFactory* factory = _DCmdFactoryList;
381 while (factory != NULL) {
382 if (strlen(factory->name()) == len &&
383 strncmp(name, factory->name(), len) == 0) {
384 return factory;
385 }
386 factory = factory->_next;
387 }
388 return NULL;
389 }
390
391 int DCmdFactory::register_DCmdFactory(DCmdFactory* factory) {
392 MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
393 factory->_next = _DCmdFactoryList;
394 _DCmdFactoryList = factory;
395 return 0; // Actually, there's no checks for duplicates
396 }
397
398 DCmd* DCmdFactory::create_global_DCmd(CmdLine &line, outputStream* out, TRAPS) {
399 DCmdFactory* f = factory(line.cmd_addr(), line.cmd_len());
400 if (f != NULL) {
401 if (f->is_enabled()) {
402 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
403 f->disabled_message());
404 }
405 return f->create_Cheap_instance(out);
406 }
407 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
408 "Unknown diagnostic command");
409 }
410
411 DCmd* DCmdFactory::create_local_DCmd(CmdLine &line, outputStream* out, TRAPS) {
412 DCmdFactory* f = factory(line.cmd_addr(), line.cmd_len());
413 if (f != NULL) {
414 if (!f->is_enabled()) {
415 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
416 f->disabled_message());
417 }
418 return f->create_resource_instance(out);
419 }
420 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
421 "Unknown diagnostic command");
422 }
423
424 GrowableArray<const char*>* DCmdFactory::DCmd_list() {
425 MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
426 GrowableArray<const char*>* array = new GrowableArray<const char*>();
427 DCmdFactory* factory = _DCmdFactoryList;
428 while (factory != NULL) {
429 if (!factory->is_hidden()) {
430 array->append(factory->name());
431 }
432 factory = factory->next();
433 }
434 return array;
435 }
436
437 GrowableArray<DCmdInfo*>* DCmdFactory::DCmdInfo_list() {
438 MutexLockerEx ml(_dcmdFactory_lock, Mutex::_no_safepoint_check_flag);
439 GrowableArray<DCmdInfo*>* array = new GrowableArray<DCmdInfo*>();
440 DCmdFactory* factory = _DCmdFactoryList;
441 while (factory != NULL) {
442 if (!factory->is_hidden()) {
443 array->append(new DCmdInfo(factory->name(),
444 factory->description(), factory->impact(),
445 factory->num_arguments(), factory->is_enabled()));
446 }
447 factory = factory->next();
448 }
449 return array;
450 }