1 /* log - a generic logging facility in the spirit of log4j */
3 /* Copyright (c) 2004-2021. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
8 /* Define the XBT_LOG_MAYDAY symbol to change all logging facilities into basic printfs, e.g. to debug the logs
10 //#define XBT_LOG_MAYDAY
16 #include <stddef.h> /* NULL */
17 #include <stdio.h> /* FILE */
20 /**@brief Log priorities
23 * The different existing priorities.
27 xbt_log_priority_none = 0, /** used internally (don't poke with)*/
29 xbt_log_priority_trace = 1, /**< enter and return of some functions */
30 xbt_log_priority_debug = 2, /**< crufty output */
31 xbt_log_priority_verbose = 3, /**< verbose output for the user wanting more */
32 xbt_log_priority_info = 4, /**< output about the regular functioning */
33 xbt_log_priority_warning = 5, /**< minor issue encountered */
34 xbt_log_priority_error = 6, /**< issue encountered */
35 xbt_log_priority_critical = 7, /**< major issue encountered */
37 xbt_log_priority_infinite = 8, /**< value for XBT_LOG_STATIC_THRESHOLD to not log */
40 xbt_log_priority_uninitialized = -1 /* used internally (don't poke with) */
42 } e_xbt_log_priority_t;
45 * define NLOG to disable at compilation time any logging request
46 * define NDEBUG to disable at compilation time any logging request of priority below VERBOSE
50 * @def XBT_LOG_STATIC_THRESHOLD
53 * All logging requests with priority < XBT_LOG_STATIC_THRESHOLD are disabled at compile time, i.e., compiled out.
56 # define XBT_LOG_STATIC_THRESHOLD xbt_log_priority_infinite
60 # define XBT_LOG_STATIC_THRESHOLD xbt_log_priority_verbose
61 # else /* !NLOG && !NDEBUG */
63 # ifndef XBT_LOG_STATIC_THRESHOLD
64 # define XBT_LOG_STATIC_THRESHOLD xbt_log_priority_none
65 # endif /* !XBT_LOG_STATIC_THRESHOLD */
67 #endif /* !defined(NLOG) */
69 /* Transforms a category name to a global variable name. */
70 #define _XBT_LOGV(cat) _XBT_CONCAT(_simgrid_log_category__, cat)
71 #define _XBT_LOGV_CTOR(cat) _XBT_CONCAT2(_XBT_LOGV(cat), __constructor__)
73 /* The root of the category hierarchy. */
74 #define XBT_LOG_ROOT_CAT root
76 /* The whole tree of categories is connected by setting the address of the parent category as a field of the child one.
77 * This is normally done at the first use of the category.
79 * It is however necessary to make this connections as early as possible, if we want the category to be listed by
80 * --help-log-categories. We use constructor attributes for these initializations to take place automatically before the
84 /* XBT_LOG_NEW_SUBCATEGORY_helper:
85 * Implementation of XBT_LOG_NEW_SUBCATEGORY, which must declare "extern parent" in addition to avoid an extra
86 * declaration of root when XBT_LOG_NEW_SUBCATEGORY is called by XBT_LOG_NEW_CATEGORY */
87 #define XBT_LOG_NEW_SUBCATEGORY_helper(catName, parent, desc) \
89 extern void _XBT_LOGV_CTOR(catName)(void) XBT_ATTRIB_CONSTRUCTOR(600); \
91 void _XBT_LOGV_CTOR(catName)(void) \
93 XBT_LOG_EXTERNAL_CATEGORY(catName); \
94 if (!_XBT_LOGV(catName).initialized) { \
95 _xbt_log_cat_init(&_XBT_LOGV(catName), xbt_log_priority_uninitialized); \
98 XBT_EXPORT_NO_IMPORT s_xbt_log_category_t _XBT_LOGV(catName) = { \
100 NULL /* firstChild */, \
101 NULL /* nextSibling */, \
102 _XBT_STRINGIFY(catName), \
104 0 /*initialized */, \
105 xbt_log_priority_uninitialized /* threshold */, \
106 1 /* isThreshInherited */, \
107 NULL /* appender */, \
114 * @param catName name of new category
115 * @param parent father of the new category in the tree
116 * @param desc string describing the purpose of this category
119 * Defines a new subcategory of the parent.
121 #define XBT_LOG_NEW_SUBCATEGORY(catName, parent, desc) \
122 XBT_LOG_EXTERNAL_CATEGORY(parent); \
123 XBT_LOG_NEW_SUBCATEGORY_helper(catName, parent, (desc))
127 * @param catName name of new category
128 * @param desc string describing the purpose of this category
131 * Creates a new subcategory of the root category.
133 #define XBT_LOG_NEW_CATEGORY(catName, desc) XBT_LOG_NEW_SUBCATEGORY_helper(catName, XBT_LOG_ROOT_CAT, (desc))
137 * @param cname name of the cat
140 * Indicates which category is the default one.
143 #if defined(XBT_LOG_MAYDAY) /*|| defined (NLOG) * turning logging off */
144 # define XBT_LOG_DEFAULT_CATEGORY(cname)
146 #define XBT_LOG_DEFAULT_CATEGORY(cname) \
147 XBT_ATTRIB_UNUSED static xbt_log_category_t _XBT_LOGV(default) = &_XBT_LOGV(cname)
152 * @param cname name of the cat
153 * @param desc string describing the purpose of this category
156 * Creates a new subcategory of the root category and makes it the default (used by macros that don't explicitly
157 * specify a category).
159 #define XBT_LOG_NEW_DEFAULT_CATEGORY(cname, desc) \
160 XBT_LOG_NEW_CATEGORY(cname, (desc)); \
161 XBT_LOG_DEFAULT_CATEGORY(cname)
165 * @param cname name of the cat
166 * @param parent name of the parent
167 * @param desc string describing the purpose of this category
170 * Creates a new subcategory of the parent category and makes it the default
171 * (used by macros that don't explicitly specify a category).
173 #define XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cname, parent, desc) \
174 XBT_LOG_NEW_SUBCATEGORY(cname, parent, (desc)); \
175 XBT_LOG_DEFAULT_CATEGORY(cname)
179 * @param cname name of the cat
182 * Indicates that a category you'll use in this file (e.g., to get subcategories of it) really lives in another file.
185 #define XBT_LOG_EXTERNAL_CATEGORY(cname) \
186 extern s_xbt_log_category_t _XBT_LOGV(cname)
190 * @param cname name of the cat
193 * Indicates that the default category of this file was declared in another file.
196 #define XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(cname) \
197 XBT_LOG_EXTERNAL_CATEGORY(cname);\
198 XBT_LOG_DEFAULT_CATEGORY(cname)
200 /* Functions you may call */
202 /** Provide a log setting as if it were passed on the command line.
205 * ( [category] "." [keyword] ":" value (" ")... )...
207 * where [category] is one the category names (see @ref XBT_log_cats for a complete list of the ones defined in the
208 * SimGrid library) and keyword is one of the following:
210 * - threshold: category's threshold priority. Possible values:
211 * TRACE,DEBUG,VERBOSE,INFO,WARNING,ERROR,CRITICAL
212 * - add or additivity: whether the logging actions must be passed to the parent category.
213 * Possible values: 0, 1, no, yes, on, off.
214 * Default value: yes.
215 * - fmt: the format to use. See @ref log_use_conf_fmt for more information.
216 * - app or appender: the appender to use. See @ref log_use_conf_app for more information.
218 XBT_PUBLIC void xbt_log_control_set(const char* cs);
220 /* Forward declarations */
221 typedef struct xbt_log_appender_s s_xbt_log_appender_t;
222 typedef s_xbt_log_appender_t* xbt_log_appender_t;
223 typedef struct xbt_log_layout_s s_xbt_log_layout_t;
224 typedef s_xbt_log_layout_t* xbt_log_layout_t;
225 typedef struct xbt_log_event_s s_xbt_log_event_t;
226 typedef s_xbt_log_event_t* xbt_log_event_t;
227 typedef struct xbt_log_category_s s_xbt_log_category_t;
228 typedef s_xbt_log_category_t* xbt_log_category_t;
230 /* Do NOT access any members of this structure directly. FIXME: move to private? */
232 struct xbt_log_category_s {
233 xbt_log_category_t parent;
234 xbt_log_category_t firstChild;
235 xbt_log_category_t nextSibling;
237 const char *description;
240 int isThreshInherited;
241 xbt_log_appender_t appender;
242 xbt_log_layout_t layout;
246 struct xbt_log_event_s {
247 xbt_log_category_t cat;
248 e_xbt_log_priority_t priority;
249 const char *fileName;
250 const char *functionName;
258 * @ingroup XBT_log_implem
259 * @param cat the category (not only its name, but the variable)
260 * @param thresholdPriority the priority
262 * Programmatically alters a category's threshold priority (don't use).
264 XBT_PUBLIC void xbt_log_threshold_set(xbt_log_category_t cat, e_xbt_log_priority_t thresholdPriority);
267 * @ingroup XBT_log_implem
268 * @param cat the category (not only its name, but the variable)
269 * @param app the appender
271 * Programmatically sets the category's appender. (the preferred interface is through xbt_log_control_set())
273 XBT_PUBLIC void xbt_log_appender_set(xbt_log_category_t cat, xbt_log_appender_t app);
275 * @ingroup XBT_log_implem
276 * @param cat the category (not only its name, but the variable)
277 * @param lay the layout
279 * Programmatically sets the category's layout. (the preferred interface is through xbt_log_control_set())
281 XBT_PUBLIC void xbt_log_layout_set(xbt_log_category_t cat, xbt_log_layout_t lay);
284 * @ingroup XBT_log_implem
285 * @param cat the category (not only its name, but the variable)
286 * @param additivity whether logging actions must be passed to parent.
288 * Programmatically sets whether the logging actions must be passed to the parent category.
289 * (the preferred interface is through xbt_log_control_set())
291 XBT_PUBLIC void xbt_log_additivity_set(xbt_log_category_t cat, int additivity);
293 /** @brief create a new simple layout
295 * This layout is not as flexible as the pattern one
297 XBT_PUBLIC xbt_log_layout_t xbt_log_layout_simple_new(const char* arg);
298 XBT_PUBLIC xbt_log_layout_t xbt_log_layout_format_new(const char* arg);
299 XBT_PUBLIC xbt_log_appender_t xbt_log_appender_stream(FILE* f);
300 XBT_PUBLIC xbt_log_appender_t xbt_log_appender_file_new(const char* arg);
301 XBT_PUBLIC xbt_log_appender_t xbt_log_appender2_file_new(const char* arg, int roll);
303 /* ********************************** */
304 /* Functions that you shouldn't call */
305 /* ********************************** */
307 /** Retrieve and parse all log settings from the command line (don't call it directly) */
308 XBT_PUBLIC void xbt_log_init(int* argc, char** argv);
309 XBT_PUBLIC void _xbt_log_event_log(xbt_log_event_t ev, const char* fmt, ...) XBT_ATTRIB_PRINTF(2, 3);
310 XBT_PUBLIC int _xbt_log_cat_init(xbt_log_category_t category, e_xbt_log_priority_t priority);
313 XBT_PUBLIC_DATA s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT);
315 // If we `dllexport` the root log category, MinGW does not want us to take its address with the error:
316 // > initializer element is not constant
317 // When using auto-import, MinGW is happy.
318 // We should handle this for non-root log categories as well.
319 extern s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT);
322 extern xbt_log_appender_t xbt_log_default_appender;
323 extern xbt_log_layout_t xbt_log_default_layout;
325 /* ********************** */
326 /* Public functions again */
327 /* ********************** */
331 * @param catName name of the category
332 * @param priority minimal priority to be enabled to return true (must be #e_xbt_log_priority_t)
335 * Returns true if the given priority is enabled for the category.
336 * If you have expensive expressions that are computed outside of the log command and used only within it, you should
337 * make its evaluation conditional using this macro.
339 #define XBT_LOG_ISENABLED(catName, priority) _XBT_LOG_ISENABLEDV(_XBT_LOGV(catName), (priority))
342 * Helper function that implements XBT_LOG_ISENABLED.
345 * First part is a compile-time constant.
346 * Call to xbt_log_cat_init only happens once.
348 #define _XBT_LOG_ISENABLEDV(catv, priority) \
349 ((priority) >= XBT_LOG_STATIC_THRESHOLD && ((catv).initialized || _xbt_log_cat_init(&(catv), (priority))) && \
350 (priority) >= (catv).threshold)
354 * Some kludge macros to ease maintenance. See how they're used below.
356 * IMPLEMENTATION NOTE: To reduce the parameter passing overhead of an enabled message, the many parameters passed to
357 * the logging function are packed in a structure. Since these values will be usually be passed to at least 3 functions,
359 * It also allows adding new values (such as a timestamp) without breaking code.
360 * Setting the LogEvent's valist member is done inside _log_logEvent.
365 #ifdef XBT_LOG_MAYDAY
366 # define XBT_CLOG(cat, prio, ...) \
367 _XBT_IF_ONE_ARG(_XBT_CLOG_ARG1, _XBT_CLOG_ARGN, __VA_ARGS__)(__VA_ARGS__)
368 # define _XBT_CLOG_ARG1(f) \
369 fprintf(stderr,"%s:%d:\n" f, __FILE__, __LINE__)
370 # define _XBT_CLOG_ARGN(f, ...) \
371 fprintf(stderr,"%s:%d:\n" f, __FILE__, __LINE__, __VA_ARGS__)
372 # define XBT_LOG(...) XBT_CLOG(0, __VA_ARGS__)
375 #define XBT_CLOG(category, prio, ...) \
377 if (_XBT_LOG_ISENABLEDV((category), (prio))) { \
378 s_xbt_log_event_t _log_ev; \
379 _log_ev.cat = &(category); \
380 _log_ev.priority = (prio); \
381 _log_ev.fileName = __FILE__; \
382 _log_ev.functionName = __func__; \
383 _log_ev.lineNum = __LINE__; \
384 _xbt_log_event_log(&_log_ev, __VA_ARGS__); \
388 #define XBT_LOG(prio, ...) XBT_CLOG(*_simgrid_log_category__default, (prio), __VA_ARGS__)
394 * @param categ the category on which to log
395 * @param ... the format string and its arguments
396 * @brief Log an event at the DEBUG priority on the specified category with these args.
398 #define XBT_CDEBUG(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_debug, __VA_ARGS__)
402 * @brief Log an event at the VERB priority on the specified category with these args.
404 #define XBT_CVERB(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_verbose, __VA_ARGS__)
408 * @brief Log an event at the INFO priority on the specified category with these args.
410 #define XBT_CINFO(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_info, __VA_ARGS__)
414 * @brief Log an event at the WARN priority on the specified category with these args.
416 #define XBT_CWARN(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_warning, __VA_ARGS__)
420 * @brief Log an event at the ERROR priority on the specified category with these args.
422 #define XBT_CERROR(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_error, __VA_ARGS__)
426 * @brief Log an event at the CRITICAL priority on the specified category with these args.
428 #define XBT_CCRITICAL(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_critical, __VA_ARGS__)
432 * @param ... the format string and its arguments
433 * @brief Log an event at the DEBUG priority on the default category with these args.
435 #define XBT_DEBUG(...) XBT_LOG(xbt_log_priority_debug, __VA_ARGS__)
439 * @brief Log an event at the VERB priority on the default category with these args.
441 #define XBT_VERB(...) XBT_LOG(xbt_log_priority_verbose, __VA_ARGS__)
445 * @brief Log an event at the INFO priority on the default category with these args.
447 #define XBT_INFO(...) XBT_LOG(xbt_log_priority_info, __VA_ARGS__)
451 * @brief Log an event at the WARN priority on the default category with these args.
453 #define XBT_WARN(...) XBT_LOG(xbt_log_priority_warning, __VA_ARGS__)
457 * @brief Log an event at the ERROR priority on the default category with these args.
459 #define XBT_ERROR(...) XBT_LOG(xbt_log_priority_error, __VA_ARGS__)
463 * @brief Log an event at the CRITICAL priority on the default category with these args.
465 #define XBT_CRITICAL(...) XBT_LOG(xbt_log_priority_critical, __VA_ARGS__)
467 #define _XBT_IN_OUT(...) \
468 _XBT_IF_ONE_ARG(_XBT_IN_OUT_ARG1, _XBT_IN_OUT_ARGN, __VA_ARGS__)(__VA_ARGS__)
469 #define _XBT_IN_OUT_ARG1(fmt) XBT_LOG(xbt_log_priority_trace, (fmt), __func__)
470 #define _XBT_IN_OUT_ARGN(fmt, ...) XBT_LOG(xbt_log_priority_trace, (fmt), __func__, __VA_ARGS__)
474 * @brief Log at TRACE priority that we entered in current function, appending a user specified format.
476 #define XBT_IN(...) _XBT_IN_OUT(">> begin of %s" __VA_ARGS__)
480 * @brief Log at TRACE priority that we exited the current function, appending a user specified format.
482 #define XBT_OUT(...) _XBT_IN_OUT("<< end of %s" __VA_ARGS__)
486 * @brief Log at TRACE priority a message indicating that we reached that point, appending a user specified format.
488 #define XBT_HERE(...) XBT_LOG(xbt_log_priority_trace, "-- was here" __VA_ARGS__)
492 * @brief Log help messages through category xbt.xbt_help.
494 #define XBT_HELP(...) XBT_CINFO(xbt_help, __VA_ARGS__)
497 #endif /* XBT_LOG_H */