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annotate src/share/vm/services/diagnosticFramework.hpp @ 5334:ecc2b68344de
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 02 May 2012 12:59:59 +0200 |
parents | f1cb6f9cfe21 |
children | d2a62e0f25eb |
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4133 | 1 /* |
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
4133 | 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 #ifndef SHARE_VM_SERVICES_DIAGNOSTICFRAMEWORK_HPP | |
26 #define SHARE_VM_SERVICES_DIAGNOSTICFRAMEWORK_HPP | |
27 | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "memory/allocation.hpp" | |
30 #include "runtime/arguments.hpp" | |
31 #include "runtime/os.hpp" | |
32 #include "runtime/vm_version.hpp" | |
33 #include "runtime/vmThread.hpp" | |
34 #include "utilities/ostream.hpp" | |
35 | |
36 | |
37 // CmdLine is the class used to handle a command line containing a single | |
38 // diagnostic command and its arguments. It provides methods to access the | |
39 // command name and the beginning of the arguments. The class is also | |
40 // able to identify commented command lines and the "stop" keyword | |
41 class CmdLine : public StackObj { | |
42 private: | |
43 const char* _cmd; | |
44 size_t _cmd_len; | |
45 const char* _args; | |
46 size_t _args_len; | |
47 public: | |
48 CmdLine(const char* line, size_t len, bool no_command_name); | |
49 const char* args_addr() const { return _args; } | |
50 size_t args_len() const { return _args_len; } | |
51 const char* cmd_addr() const { return _cmd; } | |
52 size_t cmd_len() const { return _cmd_len; } | |
53 bool is_empty() { return _cmd_len == 0; } | |
54 bool is_executable() { return is_empty() || _cmd[0] != '#'; } | |
55 bool is_stop() { return !is_empty() && strncmp("stop", _cmd, _cmd_len) == 0; } | |
56 }; | |
57 | |
58 // Iterator class taking a character string in input and returning a CmdLine | |
59 // instance for each command line. The argument delimiter has to be specified. | |
60 class DCmdIter : public StackObj { | |
61 friend class DCmd; | |
62 private: | |
63 const char* _str; | |
64 char _delim; | |
65 size_t _len; | |
66 size_t _cursor; | |
67 public: | |
68 | |
69 DCmdIter(const char* str, char delim) { | |
70 _str = str; | |
71 _delim = delim; | |
72 _len = strlen(str); | |
73 _cursor = 0; | |
74 } | |
75 bool has_next() { return _cursor < _len; } | |
76 CmdLine next() { | |
77 assert(_cursor <= _len, "Cannot iterate more"); | |
78 size_t n = _cursor; | |
79 while (n < _len && _str[n] != _delim) n++; | |
80 CmdLine line(&(_str[_cursor]), n - _cursor, false); | |
81 _cursor = n + 1; | |
82 // The default copy constructor of CmdLine is used to return a CmdLine | |
83 // instance to the caller. | |
84 return line; | |
85 } | |
86 }; | |
87 | |
88 // Iterator class to iterate over diagnostic command arguments | |
89 class DCmdArgIter : public ResourceObj { | |
90 const char* _buffer; | |
91 size_t _len; | |
92 size_t _cursor; | |
93 const char* _key_addr; | |
94 size_t _key_len; | |
95 const char* _value_addr; | |
96 size_t _value_len; | |
97 char _delim; | |
98 public: | |
99 DCmdArgIter(const char* buf, size_t len, char delim) { | |
100 _buffer = buf; | |
101 _len = len; | |
102 _delim = delim; | |
103 _cursor = 0; | |
104 } | |
105 bool next(TRAPS); | |
106 const char* key_addr() { return _key_addr; } | |
107 size_t key_length() { return _key_len; } | |
108 const char* value_addr() { return _value_addr; } | |
109 size_t value_length() { return _value_len; } | |
110 }; | |
111 | |
112 // A DCmdInfo instance provides a description of a diagnostic command. It is | |
113 // used to export the description to the JMX interface of the framework. | |
114 class DCmdInfo : public ResourceObj { | |
115 protected: | |
116 const char* _name; | |
117 const char* _description; | |
118 const char* _impact; | |
119 int _num_arguments; | |
120 bool _is_enabled; | |
121 public: | |
122 DCmdInfo(const char* name, | |
123 const char* description, | |
124 const char* impact, | |
125 int num_arguments, | |
126 bool enabled) { | |
127 this->_name = name; | |
128 this->_description = description; | |
129 this->_impact = impact; | |
130 this->_num_arguments = num_arguments; | |
131 this->_is_enabled = enabled; | |
132 } | |
133 const char* name() const { return _name; } | |
134 const char* description() const { return _description; } | |
135 const char* impact() const { return _impact; } | |
136 int num_arguments() const { return _num_arguments; } | |
137 bool is_enabled() const { return _is_enabled; } | |
138 | |
139 static bool by_name(void* name, DCmdInfo* info); | |
140 }; | |
141 | |
142 // A DCmdArgumentInfo instance provides a description of a diagnostic command | |
143 // argument. It is used to export the description to the JMX interface of the | |
144 // framework. | |
145 class DCmdArgumentInfo : public ResourceObj { | |
146 protected: | |
147 const char* _name; | |
148 const char* _description; | |
149 const char* _type; | |
150 const char* _default_string; | |
151 bool _mandatory; | |
152 bool _option; | |
153 int _position; | |
154 public: | |
155 DCmdArgumentInfo(const char* name, const char* description, const char* type, | |
156 const char* default_string, bool mandatory, bool option) { | |
157 this->_name = name; | |
158 this->_description = description; | |
159 this->_type = type; | |
160 this->_default_string = default_string; | |
161 this->_option = option; | |
162 this->_mandatory = mandatory; | |
163 this->_option = option; | |
164 this->_position = -1; | |
165 } | |
166 DCmdArgumentInfo(const char* name, const char* description, const char* type, | |
167 const char* default_string, bool mandatory, bool option, | |
168 int position) { | |
169 this->_name = name; | |
170 this->_description = description; | |
171 this->_type = type; | |
172 this->_default_string = default_string; | |
173 this->_option = option; | |
174 this->_mandatory = mandatory; | |
175 this->_option = option; | |
176 this->_position = position; | |
177 } | |
178 const char* name() const { return _name; } | |
179 const char* description() const { return _description; } | |
180 const char* type() const { return _type; } | |
181 const char* default_string() const { return _default_string; } | |
182 bool is_mandatory() const { return _mandatory; } | |
183 bool is_option() const { return _option; } | |
184 int position() const { return _position; } | |
185 }; | |
186 | |
187 // The DCmdParser class can be used to create an argument parser for a | |
188 // diagnostic command. It is not mandatory to use it to parse arguments. | |
189 class DCmdParser { | |
190 private: | |
191 GenDCmdArgument* _options; | |
192 GenDCmdArgument* _arguments_list; | |
193 char _delim; | |
194 public: | |
195 DCmdParser() { | |
196 _options = NULL; | |
197 _arguments_list = NULL; | |
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198 _delim = ' '; |
4133 | 199 } |
200 void add_dcmd_option(GenDCmdArgument* arg); | |
201 void add_dcmd_argument(GenDCmdArgument* arg); | |
202 GenDCmdArgument* lookup_dcmd_option(const char* name, size_t len); | |
203 GenDCmdArgument* arguments_list() { return _arguments_list; }; | |
204 void check(TRAPS); | |
205 void parse(CmdLine* line, char delim, TRAPS); | |
206 void print_help(outputStream* out, const char* cmd_name); | |
207 void reset(TRAPS); | |
208 void cleanup(); | |
209 int num_arguments(); | |
210 GrowableArray<const char*>* argument_name_array(); | |
211 GrowableArray<DCmdArgumentInfo*>* argument_info_array(); | |
212 }; | |
213 | |
214 // The DCmd class is the parent class of all diagnostic commands | |
215 // Diagnostic command instances should not be instantiated directly but | |
216 // created using the associated factory. The factory can be retrieved with | |
217 // the DCmdFactory::getFactory() method. | |
218 // A diagnostic command instance can either be allocated in the resource Area | |
219 // or in the C-heap. Allocation in the resource area is recommended when the | |
220 // current thread is the only one which will access the diagnostic command | |
221 // instance. Allocation in the C-heap is required when the diagnostic command | |
222 // is accessed by several threads (for instance to perform asynchronous | |
223 // execution). | |
224 // To ensure a proper cleanup, it's highly recommended to use a DCmdMark for | |
225 // each diagnostic command instance. In case of a C-heap allocated diagnostic | |
226 // command instance, the DCmdMark must be created in the context of the last | |
227 // thread that will access the instance. | |
228 class DCmd : public ResourceObj { | |
229 protected: | |
230 outputStream* _output; | |
231 bool _is_heap_allocated; | |
232 public: | |
233 DCmd(outputStream* output, bool heap_allocated) { | |
234 _output = output; | |
235 _is_heap_allocated = heap_allocated; | |
236 } | |
237 | |
238 static const char* name() { return "No Name";} | |
239 static const char* description() { return "No Help";} | |
240 static const char* disabled_message() { return "Diagnostic command currently disabled"; } | |
241 static const char* impact() { return "Low: No impact"; } | |
242 static int num_arguments() { return 0; } | |
243 outputStream* output() { return _output; } | |
244 bool is_heap_allocated() { return _is_heap_allocated; } | |
4773 | 245 virtual void print_help(const char* name) { |
246 output()->print_cr("Syntax: %s", name); | |
247 } | |
248 virtual void parse(CmdLine* line, char delim, TRAPS) { | |
249 DCmdArgIter iter(line->args_addr(), line->args_len(), delim); | |
250 bool has_arg = iter.next(CHECK); | |
251 if (has_arg) { | |
252 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), | |
253 "Unknown argument in diagnostic command"); | |
254 } | |
255 } | |
4133 | 256 virtual void execute(TRAPS) { } |
257 virtual void reset(TRAPS) { } | |
258 virtual void cleanup() { } | |
259 | |
260 // support for the JMX interface | |
261 virtual GrowableArray<const char*>* argument_name_array() { | |
262 GrowableArray<const char*>* array = new GrowableArray<const char*>(0); | |
263 return array; | |
264 } | |
265 virtual GrowableArray<DCmdArgumentInfo*>* argument_info_array() { | |
266 GrowableArray<DCmdArgumentInfo*>* array = new GrowableArray<DCmdArgumentInfo*>(0); | |
267 return array; | |
268 } | |
269 | |
270 // main method to invoke the framework | |
271 static void parse_and_execute(outputStream* out, const char* cmdline, | |
272 char delim, TRAPS); | |
273 }; | |
274 | |
4773 | 275 class DCmdWithParser : public DCmd { |
276 protected: | |
277 DCmdParser _dcmdparser; | |
278 public: | |
279 DCmdWithParser (outputStream *output, bool heap=false) : DCmd(output, heap) { } | |
280 static const char* name() { return "No Name";} | |
281 static const char* description() { return "No Help";} | |
282 static const char* disabled_message() { return "Diagnostic command currently disabled"; } | |
283 static const char* impact() { return "Low: No impact"; } | |
284 static int num_arguments() { return 0; } | |
285 virtual void parse(CmdLine *line, char delim, TRAPS); | |
286 virtual void execute(TRAPS) { } | |
287 virtual void reset(TRAPS); | |
288 virtual void cleanup(); | |
289 virtual void print_help(const char* name); | |
290 virtual GrowableArray<const char*>* argument_name_array(); | |
291 virtual GrowableArray<DCmdArgumentInfo*>* argument_info_array(); | |
292 }; | |
293 | |
4133 | 294 class DCmdMark : public StackObj { |
295 DCmd* _ref; | |
296 public: | |
297 DCmdMark(DCmd* cmd) { _ref = cmd; } | |
298 ~DCmdMark() { | |
299 if (_ref != NULL) { | |
300 _ref->cleanup(); | |
301 if (_ref->is_heap_allocated()) { | |
302 delete _ref; | |
303 } | |
304 } | |
305 } | |
306 }; | |
307 | |
308 // Diagnostic commands are not directly instantiated but created with a factory. | |
309 // Each diagnostic command class has its own factory. The DCmdFactory class also | |
310 // manages the status of the diagnostic command (hidden, enabled). A DCmdFactory | |
311 // has to be registered to make the diagnostic command available (see | |
312 // management.cpp) | |
313 class DCmdFactory: public CHeapObj { | |
314 private: | |
315 static Mutex* _dcmdFactory_lock; | |
316 // Pointer to the next factory in the singly-linked list of registered | |
317 // diagnostic commands | |
318 DCmdFactory* _next; | |
319 // When disabled, a diagnostic command cannot be executed. Any attempt to | |
320 // execute it will result in the printing of the disabled message without | |
321 // instantiating the command. | |
322 bool _enabled; | |
323 // When hidden, a diagnostic command doesn't appear in the list of commands | |
324 // provided by the 'help' command. | |
325 bool _hidden; | |
326 int _num_arguments; | |
327 static DCmdFactory* _DCmdFactoryList; | |
328 public: | |
329 DCmdFactory(int num_arguments, bool enabled, bool hidden) { | |
330 _next = NULL; | |
331 _enabled = enabled; | |
332 _hidden = hidden; | |
333 _num_arguments = num_arguments; | |
334 } | |
335 bool is_enabled() const { return _enabled; } | |
336 void set_enabled(bool b) { _enabled = b; } | |
337 bool is_hidden() const { return _hidden; } | |
338 void set_hidden(bool b) { _hidden = b; } | |
339 int num_arguments() { return _num_arguments; } | |
340 DCmdFactory* next() { return _next; } | |
341 virtual DCmd* create_Cheap_instance(outputStream* output) = 0; | |
342 virtual DCmd* create_resource_instance(outputStream* output) = 0; | |
343 virtual const char* name() const = 0; | |
344 virtual const char* description() const = 0; | |
345 virtual const char* impact() const = 0; | |
346 virtual const char* disabled_message() const = 0; | |
347 // Register a DCmdFactory to make a diagnostic command available. | |
348 // Once registered, a diagnostic command must not be unregistered. | |
349 // To prevent a diagnostic command from being executed, just set the | |
350 // enabled flag to false. | |
351 static int register_DCmdFactory(DCmdFactory* factory); | |
352 static DCmdFactory* factory(const char* cmd, size_t len); | |
353 // Returns a C-heap allocated diagnostic command for the given command line | |
354 static DCmd* create_global_DCmd(CmdLine &line, outputStream* out, TRAPS); | |
355 // Returns a resourceArea allocated diagnostic command for the given command line | |
356 static DCmd* create_local_DCmd(CmdLine &line, outputStream* out, TRAPS); | |
357 static GrowableArray<const char*>* DCmd_list(); | |
358 static GrowableArray<DCmdInfo*>* DCmdInfo_list(); | |
359 | |
360 friend class HelpDCmd; | |
361 }; | |
362 | |
363 // Template to easily create DCmdFactory instances. See management.cpp | |
364 // where this template is used to create and register factories. | |
365 template <class DCmdClass> class DCmdFactoryImpl : public DCmdFactory { | |
366 public: | |
367 DCmdFactoryImpl(bool enabled, bool hidden) : | |
368 DCmdFactory(DCmdClass::num_arguments(), enabled, hidden) { } | |
369 // Returns a C-heap allocated instance | |
370 virtual DCmd* create_Cheap_instance(outputStream* output) { | |
371 return new (ResourceObj::C_HEAP) DCmdClass(output, true); | |
372 } | |
373 // Returns a resourceArea allocated instance | |
374 virtual DCmd* create_resource_instance(outputStream* output) { | |
375 return new DCmdClass(output, false); | |
376 } | |
377 virtual const char* name() const { | |
378 return DCmdClass::name(); | |
379 } | |
380 virtual const char* description() const { | |
381 return DCmdClass::description(); | |
382 } | |
383 virtual const char* impact() const { | |
384 return DCmdClass::impact(); | |
385 } | |
386 virtual const char* disabled_message() const { | |
387 return DCmdClass::disabled_message(); | |
388 } | |
389 }; | |
390 | |
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391 // This class provides a convenient way to register Dcmds, without a need to change |
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392 // management.cpp every time. Body of these two methods resides in |
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393 // diagnosticCommand.cpp |
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394 |
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395 class DCmdRegistrant : public AllStatic { |
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396 |
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397 private: |
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398 static void register_dcmds(); |
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399 static void register_dcmds_ext(); |
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400 |
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401 friend class Management; |
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402 }; |
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403 |
4133 | 404 #endif // SHARE_VM_SERVICES_DIAGNOSTICFRAMEWORK_HPP |