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 /* Asserts that the provided name was not already used for another category */
85 void _xbt_log_is_name_unique(const char* name, const char* file, int line);
87 /* XBT_LOG_NEW_SUBCATEGORY_helper:
88 * Implementation of XBT_LOG_NEW_SUBCATEGORY, which must declare "extern parent" in addition to avoid an extra
89 * declaration of root when XBT_LOG_NEW_SUBCATEGORY is called by XBT_LOG_NEW_CATEGORY */
90 #define XBT_LOG_NEW_SUBCATEGORY_helper(catName, parent, desc) \
92 extern void _XBT_LOGV_CTOR(catName)(void) XBT_ATTRIB_CONSTRUCTOR(600); \
94 void _XBT_LOGV_CTOR(catName)(void) \
96 XBT_LOG_EXTERNAL_CATEGORY(catName); \
97 _xbt_log_is_name_unique(_XBT_STRINGIFY(catName), __FILE__, __LINE__); \
98 if (!_XBT_LOGV(catName).initialized) { \
99 _xbt_log_cat_init(&_XBT_LOGV(catName), xbt_log_priority_uninitialized); \
102 XBT_EXPORT_NO_IMPORT s_xbt_log_category_t _XBT_LOGV(catName) = { \
103 &_XBT_LOGV(parent), \
104 NULL /* firstChild */, \
105 NULL /* nextSibling */, \
106 _XBT_STRINGIFY(catName), \
108 0 /*initialized */, \
109 xbt_log_priority_uninitialized /* threshold */, \
110 1 /* isThreshInherited */, \
111 NULL /* appender */, \
118 * @param catName name of new category
119 * @param parent father of the new category in the tree
120 * @param desc string describing the purpose of this category
123 * Defines a new subcategory of the parent.
125 #define XBT_LOG_NEW_SUBCATEGORY(catName, parent, desc) \
126 XBT_LOG_EXTERNAL_CATEGORY(parent); \
127 XBT_LOG_NEW_SUBCATEGORY_helper(catName, parent, (desc))
131 * @param catName name of new category
132 * @param desc string describing the purpose of this category
135 * Creates a new subcategory of the root category.
137 #define XBT_LOG_NEW_CATEGORY(catName, desc) XBT_LOG_NEW_SUBCATEGORY_helper(catName, XBT_LOG_ROOT_CAT, (desc))
141 * @param cname name of the cat
144 * Indicates which category is the default one.
147 #if defined(XBT_LOG_MAYDAY) /*|| defined (NLOG) * turning logging off */
148 # define XBT_LOG_DEFAULT_CATEGORY(cname)
150 #define XBT_LOG_DEFAULT_CATEGORY(cname) \
151 XBT_ATTRIB_UNUSED static xbt_log_category_t _XBT_LOGV(default) = &_XBT_LOGV(cname)
156 * @param cname name of the cat
157 * @param desc string describing the purpose of this category
160 * Creates a new subcategory of the root category and makes it the default (used by macros that don't explicitly
161 * specify a category).
163 #define XBT_LOG_NEW_DEFAULT_CATEGORY(cname, desc) \
164 XBT_LOG_NEW_CATEGORY(cname, (desc)); \
165 XBT_LOG_DEFAULT_CATEGORY(cname)
169 * @param cname name of the cat
170 * @param parent name of the parent
171 * @param desc string describing the purpose of this category
174 * Creates a new subcategory of the parent category and makes it the default
175 * (used by macros that don't explicitly specify a category).
177 #define XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cname, parent, desc) \
178 XBT_LOG_NEW_SUBCATEGORY(cname, parent, (desc)); \
179 XBT_LOG_DEFAULT_CATEGORY(cname)
183 * @param cname name of the cat
186 * Indicates that a category you'll use in this file (e.g., to get subcategories of it) really lives in another file.
189 #define XBT_LOG_EXTERNAL_CATEGORY(cname) \
190 extern s_xbt_log_category_t _XBT_LOGV(cname)
194 * @param cname name of the cat
197 * Indicates that the default category of this file was declared in another file.
200 #define XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(cname) \
201 XBT_LOG_EXTERNAL_CATEGORY(cname);\
202 XBT_LOG_DEFAULT_CATEGORY(cname)
204 /* Functions you may call */
206 XBT_PUBLIC void xbt_log_control_set(const char* cs);
208 /* Forward declarations */
209 typedef struct xbt_log_appender_s s_xbt_log_appender_t;
210 typedef s_xbt_log_appender_t* xbt_log_appender_t;
211 typedef struct xbt_log_layout_s s_xbt_log_layout_t;
212 typedef s_xbt_log_layout_t* xbt_log_layout_t;
213 typedef struct xbt_log_event_s s_xbt_log_event_t;
214 typedef s_xbt_log_event_t* xbt_log_event_t;
215 typedef struct xbt_log_category_s s_xbt_log_category_t;
216 typedef s_xbt_log_category_t* xbt_log_category_t;
218 /* Do NOT access any members of this structure directly. FIXME: move to private? */
220 struct xbt_log_category_s {
221 xbt_log_category_t parent;
222 xbt_log_category_t firstChild;
223 xbt_log_category_t nextSibling;
225 const char *description;
228 int isThreshInherited;
229 xbt_log_appender_t appender;
230 xbt_log_layout_t layout;
234 struct xbt_log_event_s {
235 xbt_log_category_t cat;
236 e_xbt_log_priority_t priority;
237 const char *fileName;
238 const char *functionName;
246 * @ingroup XBT_log_implem
247 * @param cat the category (not only its name, but the variable)
248 * @param thresholdPriority the priority
250 * Programmatically alters a category's threshold priority (don't use).
252 XBT_PUBLIC void xbt_log_threshold_set(xbt_log_category_t cat, e_xbt_log_priority_t thresholdPriority);
255 * @ingroup XBT_log_implem
256 * @param cat the category (not only its name, but the variable)
257 * @param app the appender
259 * Programmatically sets the category's appender. (the preferred interface is through xbt_log_control_set())
261 XBT_PUBLIC void xbt_log_appender_set(xbt_log_category_t cat, xbt_log_appender_t app);
263 * @ingroup XBT_log_implem
264 * @param cat the category (not only its name, but the variable)
265 * @param lay the layout
267 * Programmatically sets the category's layout. (the preferred interface is through xbt_log_control_set())
269 XBT_PUBLIC void xbt_log_layout_set(xbt_log_category_t cat, xbt_log_layout_t lay);
272 * @ingroup XBT_log_implem
273 * @param cat the category (not only its name, but the variable)
274 * @param additivity whether logging actions must be passed to parent.
276 * Programmatically sets whether the logging actions must be passed to the parent category.
277 * (the preferred interface is through xbt_log_control_set())
279 XBT_PUBLIC void xbt_log_additivity_set(xbt_log_category_t cat, int additivity);
281 /** @brief create a new simple layout
283 * This layout is not as flexible as the pattern one
285 XBT_PUBLIC xbt_log_layout_t xbt_log_layout_simple_new(const char* arg);
286 XBT_PUBLIC xbt_log_layout_t xbt_log_layout_format_new(const char* arg);
287 XBT_PUBLIC xbt_log_appender_t xbt_log_appender_stream(FILE* f);
288 XBT_PUBLIC xbt_log_appender_t xbt_log_appender_file_new(const char* arg);
289 XBT_PUBLIC xbt_log_appender_t xbt_log_appender2_file_new(const char* arg, int roll);
291 /* ********************************** */
292 /* Functions that you shouldn't call */
293 /* ********************************** */
294 XBT_PUBLIC void xbt_log_init(int* argc, char** argv);
295 XBT_PUBLIC void _xbt_log_event_log(xbt_log_event_t ev, const char* fmt, ...) XBT_ATTRIB_PRINTF(2, 3);
296 XBT_PUBLIC int _xbt_log_cat_init(xbt_log_category_t category, e_xbt_log_priority_t priority);
299 XBT_PUBLIC_DATA s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT);
301 // If we `dllexport` the root log category, MinGW does not want us to take its address with the error:
302 // > initializer element is not constant
303 // When using auto-import, MinGW is happy.
304 // We should handle this for non-root log categories as well.
305 extern s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT);
308 extern xbt_log_appender_t xbt_log_default_appender;
309 extern xbt_log_layout_t xbt_log_default_layout;
311 /* ********************** */
312 /* Public functions again */
313 /* ********************** */
317 * @param catName name of the category
318 * @param priority minimal priority to be enabled to return true (must be #e_xbt_log_priority_t)
321 * Returns true if the given priority is enabled for the category.
322 * If you have expensive expressions that are computed outside of the log command and used only within it, you should
323 * make its evaluation conditional using this macro.
325 #define XBT_LOG_ISENABLED(catName, priority) _XBT_LOG_ISENABLEDV(_XBT_LOGV(catName), (priority))
328 * Helper function that implements XBT_LOG_ISENABLED.
331 * First part is a compile-time constant.
332 * Call to xbt_log_cat_init only happens once.
334 #define _XBT_LOG_ISENABLEDV(catv, priority) \
335 ((priority) >= XBT_LOG_STATIC_THRESHOLD && ((catv).initialized || _xbt_log_cat_init(&(catv), (priority))) && \
336 (priority) >= (catv).threshold)
340 * Some kludge macros to ease maintenance. See how they're used below.
342 * IMPLEMENTATION NOTE: To reduce the parameter passing overhead of an enabled message, the many parameters passed to
343 * the logging function are packed in a structure. Since these values will be usually be passed to at least 3 functions,
345 * It also allows adding new values (such as a timestamp) without breaking code.
346 * Setting the LogEvent's valist member is done inside _log_logEvent.
351 #ifdef XBT_LOG_MAYDAY
352 # define XBT_CLOG(cat, prio, ...) \
353 _XBT_IF_ONE_ARG(_XBT_CLOG_ARG1, _XBT_CLOG_ARGN, __VA_ARGS__)(__VA_ARGS__)
354 # define _XBT_CLOG_ARG1(f) \
355 fprintf(stderr,"%s:%d:\n" f, __FILE__, __LINE__)
356 # define _XBT_CLOG_ARGN(f, ...) \
357 fprintf(stderr,"%s:%d:\n" f, __FILE__, __LINE__, __VA_ARGS__)
358 # define XBT_LOG(...) XBT_CLOG(0, __VA_ARGS__)
361 #define XBT_CLOG(category, prio, ...) \
363 if (_XBT_LOG_ISENABLEDV((category), (prio))) { \
364 s_xbt_log_event_t _log_ev; \
365 _log_ev.cat = &(category); \
366 _log_ev.priority = (prio); \
367 _log_ev.fileName = __FILE__; \
368 _log_ev.functionName = __func__; \
369 _log_ev.lineNum = __LINE__; \
370 _xbt_log_event_log(&_log_ev, __VA_ARGS__); \
374 #define XBT_LOG(prio, ...) XBT_CLOG(*_simgrid_log_category__default, (prio), __VA_ARGS__)
380 * @param categ the category on which to log
381 * @param ... the format string and its arguments
382 * @brief Log an event at the DEBUG priority on the specified category with these args.
384 #define XBT_CDEBUG(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_debug, __VA_ARGS__)
388 * @brief Log an event at the VERB priority on the specified category with these args.
390 #define XBT_CVERB(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_verbose, __VA_ARGS__)
394 * @brief Log an event at the INFO priority on the specified category with these args.
396 #define XBT_CINFO(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_info, __VA_ARGS__)
400 * @brief Log an event at the WARN priority on the specified category with these args.
402 #define XBT_CWARN(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_warning, __VA_ARGS__)
406 * @brief Log an event at the ERROR priority on the specified category with these args.
408 #define XBT_CERROR(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_error, __VA_ARGS__)
412 * @brief Log an event at the CRITICAL priority on the specified category with these args.
414 #define XBT_CCRITICAL(categ, ...) XBT_CLOG(_XBT_LOGV(categ), xbt_log_priority_critical, __VA_ARGS__)
418 * @param ... the format string and its arguments
419 * @brief Log an event at the DEBUG priority on the default category with these args.
421 #define XBT_DEBUG(...) XBT_LOG(xbt_log_priority_debug, __VA_ARGS__)
425 * @brief Log an event at the VERB priority on the default category with these args.
427 #define XBT_VERB(...) XBT_LOG(xbt_log_priority_verbose, __VA_ARGS__)
431 * @brief Log an event at the INFO priority on the default category with these args.
433 #define XBT_INFO(...) XBT_LOG(xbt_log_priority_info, __VA_ARGS__)
437 * @brief Log an event at the WARN priority on the default category with these args.
439 #define XBT_WARN(...) XBT_LOG(xbt_log_priority_warning, __VA_ARGS__)
443 * @brief Log an event at the ERROR priority on the default category with these args.
445 #define XBT_ERROR(...) XBT_LOG(xbt_log_priority_error, __VA_ARGS__)
449 * @brief Log an event at the CRITICAL priority on the default category with these args.
451 #define XBT_CRITICAL(...) XBT_LOG(xbt_log_priority_critical, __VA_ARGS__)
453 #define _XBT_IN_OUT(...) \
454 _XBT_IF_ONE_ARG(_XBT_IN_OUT_ARG1, _XBT_IN_OUT_ARGN, __VA_ARGS__)(__VA_ARGS__)
455 #define _XBT_IN_OUT_ARG1(fmt) XBT_LOG(xbt_log_priority_trace, (fmt), __func__)
456 #define _XBT_IN_OUT_ARGN(fmt, ...) XBT_LOG(xbt_log_priority_trace, (fmt), __func__, __VA_ARGS__)
460 * @brief Log at TRACE priority that we entered in current function, appending a user specified format.
462 #define XBT_IN(...) _XBT_IN_OUT(">> begin of %s" __VA_ARGS__)
466 * @brief Log at TRACE priority that we exited the current function, appending a user specified format.
468 #define XBT_OUT(...) _XBT_IN_OUT("<< end of %s" __VA_ARGS__)
472 * @brief Log at TRACE priority a message indicating that we reached that point, appending a user specified format.
474 #define XBT_HERE(...) XBT_LOG(xbt_log_priority_trace, "-- was here" __VA_ARGS__)
478 * @brief Log help messages through category xbt.xbt_help.
480 #define XBT_HELP(...) XBT_CINFO(xbt_help, __VA_ARGS__)
483 #endif /* XBT_LOG_H */