1 /* log - a generic logging facility in the spirit of log4j */
3 /* Copyright (c) 2004-2023. 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 #include "src/xbt/log_private.hpp"
9 #include "xbt/string.hpp"
10 #include "xbt/sysdep.h"
14 #include <boost/tokenizer.hpp>
20 int xbt_log_no_loc = 0; /* if set to true (with --log=no_loc), file localization will be omitted (for tesh tests) */
22 struct xbt_log_setting_t {
25 e_xbt_log_priority_t thresh = xbt_log_priority_uninitialized;
27 xbt_log_appender_t appender = nullptr;
30 // This function is here to avoid static initialization order fiasco
31 static auto& xbt_log_settings()
33 static std::vector<xbt_log_setting_t> value;
37 constexpr std::array<const char*, xbt_log_priority_infinite> xbt_log_priority_names{
38 {"NONE", "TRACE", "DEBUG", "VERBOSE", "INFO", "WARNING", "ERROR", "CRITICAL"}};
40 s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT) = {
42 nullptr /* firstChild */,
43 nullptr /* nextSibling */,
45 "The common ancestor for all categories",
47 xbt_log_priority_uninitialized /* threshold */,
48 0 /* isThreshInherited */,
49 nullptr /* appender */,
54 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(log, xbt, "Loggings from the logging mechanism itself");
56 static void xbt_log_help();
57 static void xbt_log_help_categories();
58 static void xbt_log_postexit();
60 void xbt_log_init(int *argc, char **argv)
62 unsigned help_requested = 0; /* 1: logs; 2: categories */
64 int parse_args = 1; // Stop parsing the parameters once we found '--'
66 xbt_log_control_set("xbt_help.app:stdout xbt_help.threshold:VERBOSE xbt_help.fmt:%m%n");
67 atexit(xbt_log_postexit);
69 /* Set logs and init log submodule */
70 for (int i = 1; i < *argc; i++) {
71 if (strcmp("--", argv[i]) == 0) {
73 argv[j++] = argv[i]; // Keep the '--' for sg_config
74 } else if (parse_args && strncmp(argv[i], "--log=", strlen("--log=")) == 0) {
75 char* opt = strchr(argv[i], '=');
77 xbt_log_control_set(opt);
78 XBT_DEBUG("Did apply '%s' as log setting", opt);
79 } else if (parse_args && strcmp(argv[i], "--help-logs") == 0) {
81 } else if (parse_args && strcmp(argv[i], "--help-log-categories") == 0) {
93 if (help_requested & 1)
95 if (help_requested & 2)
96 xbt_log_help_categories();
101 static void log_cat_exit(const s_xbt_log_category_t* cat)
104 if (cat->appender->free_)
105 cat->appender->free_(cat->appender);
106 xbt_free(cat->appender);
109 if (cat->layout->free_)
110 cat->layout->free_(cat->layout);
111 xbt_free(cat->layout);
114 for (auto const* child = cat->firstChild; child != nullptr; child = child->nextSibling)
118 static void xbt_log_postexit(void)
120 XBT_VERB("Exiting log");
121 log_cat_exit(&_XBT_LOGV(XBT_LOG_ROOT_CAT));
124 /* Size of the static string in which we build the log string */
125 static constexpr size_t XBT_LOG_STATIC_BUFFER_SIZE = 2048;
126 /* Minimum size of the dynamic string in which we build the log string
127 (should be greater than XBT_LOG_STATIC_BUFFER_SIZE) */
128 static constexpr size_t XBT_LOG_DYNAMIC_BUFFER_SIZE = 4096;
130 void _xbt_log_event_log(xbt_log_event_t ev, const char *fmt, ...)
132 const xbt_log_category_s* cat = ev->cat;
134 xbt_assert(ev->priority >= 0, "Negative logging priority naturally forbidden");
135 xbt_assert(static_cast<size_t>(ev->priority) < xbt_log_priority_names.size(),
136 "Priority %d is greater than the biggest allowed value", ev->priority);
139 if (const s_xbt_log_appender_t* appender = cat->appender) {
140 xbt_assert(cat->layout, "No valid layout for the appender of category %s", cat->name);
142 /* First, try with a static buffer */
144 std::array<char, XBT_LOG_STATIC_BUFFER_SIZE> buff;
145 ev->buffer = buff.data();
146 ev->buffer_size = buff.size();
147 va_start(ev->ap, fmt);
148 done = cat->layout->do_layout(cat->layout, ev, fmt);
150 ev->buffer = nullptr; // Calm down, static analyzers, this pointer to local array won't leak out of the scope.
152 appender->do_append(appender, buff.data());
154 /* The static buffer was too small, use a dynamically expanded one */
155 ev->buffer_size = XBT_LOG_DYNAMIC_BUFFER_SIZE;
156 ev->buffer = static_cast<char*>(xbt_malloc(ev->buffer_size));
158 va_start(ev->ap, fmt);
159 done = cat->layout->do_layout(cat->layout, ev, fmt);
163 ev->buffer_size *= 2;
164 ev->buffer = static_cast<char*>(xbt_realloc(ev->buffer, ev->buffer_size));
166 appender->do_append(appender, ev->buffer);
167 xbt_free(ev->buffer);
171 if (not cat->additivity)
179 * The standard logging macros use _XBT_LOG_ISENABLED, which calls _xbt_log_cat_init(). Thus, if we want to avoid an
180 * infinite recursion, we can not use the standard logging macros in _xbt_log_cat_init(), and in all functions called
183 * To circumvent the problem, we define the macro DISABLE_XBT_LOG_CAT_INIT() to hide the real _xbt_log_cat_init(). The
184 * macro has to be called at the beginning of the affected functions.
186 static int fake_xbt_log_cat_init(xbt_log_category_t, e_xbt_log_priority_t)
190 #define DISABLE_XBT_LOG_CAT_INIT() \
191 XBT_ATTRIB_UNUSED int (*_xbt_log_cat_init)(xbt_log_category_t, e_xbt_log_priority_t) = fake_xbt_log_cat_init
193 static void _xbt_log_cat_apply_set(xbt_log_category_t category, const xbt_log_setting_t& setting)
195 DISABLE_XBT_LOG_CAT_INIT();
196 if (setting.thresh != xbt_log_priority_uninitialized) {
197 xbt_log_threshold_set(category, setting.thresh);
199 XBT_DEBUG("Apply settings for category '%s': set threshold to %s (=%d)",
200 category->name, xbt_log_priority_names[category->threshold], category->threshold);
203 if (not setting.fmt.empty()) {
204 xbt_log_layout_set(category, xbt_log_layout_format_new(setting.fmt.c_str()));
206 XBT_DEBUG("Apply settings for category '%s': set format to %s", category->name, setting.fmt.c_str());
209 if (setting.additivity != -1) {
210 xbt_log_additivity_set(category, setting.additivity);
212 XBT_DEBUG("Apply settings for category '%s': set additivity to %s", category->name,
213 (setting.additivity ? "on" : "off"));
215 if (setting.appender) {
216 xbt_log_appender_set(category, setting.appender);
217 if (not category->layout)
218 xbt_log_layout_set(category, xbt_log_layout_simple_new(nullptr));
219 category->additivity = 0;
220 XBT_DEBUG("Set %p as appender of category '%s'", setting.appender, category->name);
225 * This gets called the first time a category is referenced and performs the initialization.
226 * Also resets threshold to inherited!
228 int _xbt_log_cat_init(xbt_log_category_t category, e_xbt_log_priority_t priority)
230 DISABLE_XBT_LOG_CAT_INIT();
231 if (category->initialized)
232 return priority >= category->threshold;
234 static std::recursive_mutex log_cat_init_mutex;
235 log_cat_init_mutex.lock();
237 XBT_DEBUG("Initializing category '%s' (firstChild=%s, nextSibling=%s)", category->name,
238 (category->firstChild ? category->firstChild->name : "none"),
239 (category->nextSibling ? category->nextSibling->name : "none"));
241 if (category == &_XBT_LOGV(XBT_LOG_ROOT_CAT)) {
242 category->threshold = xbt_log_priority_info;
243 category->appender = xbt_log_appender_stream(stderr);
244 category->layout = xbt_log_layout_simple_new(nullptr);
246 if (not category->parent)
247 category->parent = &_XBT_LOGV(XBT_LOG_ROOT_CAT);
249 XBT_DEBUG("Set %s (%s) as father of %s ", category->parent->name,
250 (category->parent->initialized ? xbt_log_priority_names[category->parent->threshold] : "uninited"),
252 xbt_log_parent_set(category, category->parent);
254 if (XBT_LOG_ISENABLED(log, xbt_log_priority_debug)) {
256 const xbt_log_category_s* cpp = category->parent->firstChild;
258 res += std::string(" ") + cpp->name;
259 cpp = cpp->nextSibling;
262 XBT_DEBUG("Children of %s:%s; nextSibling: %s", category->parent->name, res.c_str(),
263 (category->parent->nextSibling ? category->parent->nextSibling->name : "none"));
267 /* Apply the control */
268 if (auto iset = std::find_if(begin(xbt_log_settings()), end(xbt_log_settings()),
269 [category](const xbt_log_setting_t& s) { return s.catname == category->name; });
270 iset != xbt_log_settings().end()) {
271 _xbt_log_cat_apply_set(category, *iset);
272 xbt_log_settings().erase(iset);
274 XBT_DEBUG("Category '%s': inherited threshold = %s (=%d)", category->name,
275 xbt_log_priority_names[category->threshold], category->threshold);
278 category->initialized = 1;
279 log_cat_init_mutex.unlock();
280 return priority >= category->threshold;
283 void xbt_log_parent_set(xbt_log_category_t cat, xbt_log_category_t parent)
285 xbt_assert(cat, "NULL category to be given a parent");
286 xbt_assert(parent, "The parent category of %s is NULL", cat->name);
288 /* if the category is initialized, unlink from current parent */
289 if (cat->initialized) {
290 xbt_log_category_t *cpp = &cat->parent->firstChild;
292 while (*cpp != cat && *cpp != nullptr) {
293 cpp = &(*cpp)->nextSibling;
296 xbt_assert(*cpp == cat);
297 *cpp = cat->nextSibling;
300 cat->parent = parent;
301 cat->nextSibling = parent->firstChild;
303 parent->firstChild = cat;
305 if (not parent->initialized)
306 (void)_xbt_log_cat_init(parent, xbt_log_priority_uninitialized /* ignored */);
308 cat->threshold = parent->threshold;
310 cat->isThreshInherited = 1;
313 static void _set_inherited_thresholds(const s_xbt_log_category_t* cat)
315 xbt_log_category_t child = cat->firstChild;
317 for (; child != nullptr; child = child->nextSibling) {
318 if (child->isThreshInherited) {
319 if (cat != &_XBT_LOGV(log))
320 XBT_VERB("Set category threshold of %s to %s (=%d)",
321 child->name, xbt_log_priority_names[cat->threshold], cat->threshold);
322 child->threshold = cat->threshold;
323 _set_inherited_thresholds(child);
328 void xbt_log_threshold_set(xbt_log_category_t cat, e_xbt_log_priority_t threshold)
330 cat->threshold = threshold;
331 cat->isThreshInherited = 0;
333 _set_inherited_thresholds(cat);
336 static xbt_log_setting_t _xbt_log_parse_setting(const char *control_string)
338 const char *orig_control_string = control_string;
339 xbt_log_setting_t set;
341 if (not*control_string)
343 XBT_DEBUG("Parse log setting '%s'", control_string);
345 control_string += strspn(control_string, " ");
346 const char* name = control_string;
347 control_string += strcspn(control_string, ".:= ");
348 const char* option = control_string;
349 control_string += strcspn(control_string, ":= ");
350 const char* value = control_string;
352 xbt_assert(*option == '.' && (*value == '=' || *value == ':'), "Invalid control string '%s'", orig_control_string);
354 size_t name_len = option - name;
356 size_t option_len = value - option;
359 if (strncmp(option, "threshold", option_len) == 0) {
360 XBT_DEBUG("New priority name = %s", value);
362 for (i = 0; i < xbt_log_priority_infinite; i++) {
363 if (strcasecmp(value, xbt_log_priority_names[i]) == 0) {
364 XBT_DEBUG("This is priority %d", i);
369 if(i<XBT_LOG_STATIC_THRESHOLD){
370 fprintf(stderr, "Priority '%s' (in setting '%s') is above allowed priority '%s'.\n\n"
371 "Compiling SimGrid with -DNDEBUG forbids the levels 'trace' and 'debug'\n"
372 "while -DNLOG forbids any logging, at any level.",
373 value, name, xbt_log_priority_names[XBT_LOG_STATIC_THRESHOLD]);
375 }else if (i < xbt_log_priority_infinite) {
376 set.thresh = (e_xbt_log_priority_t)i;
378 throw std::invalid_argument(simgrid::xbt::string_printf(
379 "Unknown priority name: %s (must be one of: trace,debug,verbose,info,warning,error,critical)", value));
381 } else if (strncmp(option, "additivity", option_len) == 0) {
382 set.additivity = (strcasecmp(value, "ON") == 0 || strcasecmp(value, "YES") == 0 || strcmp(value, "1") == 0);
383 } else if (strncmp(option, "appender", option_len) == 0) {
384 if (strncmp(value, "file:", 5) == 0) {
385 set.appender = xbt_log_appender_file_new(value + 5);
386 } else if (strncmp(value, "rollfile:", 9) == 0) {
387 set.appender = xbt_log_appender2_file_new(value + 9, 1);
388 } else if (strncmp(value, "splitfile:", 10) == 0) {
389 set.appender = xbt_log_appender2_file_new(value + 10, 0);
390 } else if (strcmp(value, "stderr") == 0) {
391 set.appender = xbt_log_appender_stream(stderr);
392 } else if (strcmp(value, "stdout") == 0) {
393 set.appender = xbt_log_appender_stream(stdout);
395 throw std::invalid_argument(simgrid::xbt::string_printf("Unknown appender log type: '%s'", value));
397 } else if (strncmp(option, "fmt", option_len) == 0) {
400 xbt_die("Unknown setting of the log category: '%.*s'", static_cast<int>(option_len), option);
402 set.catname = std::string(name, name_len);
404 XBT_DEBUG("This is for cat '%s'", set.catname.c_str());
409 static xbt_log_category_t _xbt_log_cat_searchsub(xbt_log_category_t cat, const char* name)
411 XBT_DEBUG("Search '%s' into '%s' (firstChild='%s'; nextSibling='%s')", name,
412 cat->name, (cat->firstChild ? cat->firstChild->name : "none"),
413 (cat->nextSibling ? cat->nextSibling->name : "none"));
414 if (strcmp(cat->name, name) == 0)
417 for (xbt_log_category_t child = cat->firstChild; child != nullptr; child = child->nextSibling) {
418 XBT_DEBUG("Dig into %s", child->name);
419 xbt_log_category_t res = _xbt_log_cat_searchsub(child, name);
427 void xbt_log_control_set(const char *control_string)
429 if (not control_string)
431 XBT_DEBUG("Parse log settings '%s'", control_string);
433 /* Special handling of no_loc request, which asks for any file localization to be omitted (for tesh runs) */
434 if (strcmp(control_string, "no_loc") == 0) {
438 /* Split the string, and remove empty entries
439 Parse each entry and either use it right now (if the category was already created), or store it for further use */
440 std::string parsed_control_string(control_string);
441 boost::escaped_list_separator<char> sep("\\", " ", "\"'");
442 boost::tokenizer<boost::escaped_list_separator<char>> tok(parsed_control_string, sep);
443 for (const auto& str : tok) {
447 xbt_log_setting_t set = _xbt_log_parse_setting(str.c_str());
448 xbt_log_category_t cat = _xbt_log_cat_searchsub(&_XBT_LOGV(XBT_LOG_ROOT_CAT), set.catname.c_str());
451 XBT_DEBUG("Apply directly");
452 _xbt_log_cat_apply_set(cat, set);
454 XBT_DEBUG("Store for further application");
455 XBT_DEBUG("push %p to the settings", &set);
456 xbt_log_settings().emplace_back(std::move(set));
461 void xbt_log_appender_set(xbt_log_category_t cat, xbt_log_appender_t app)
464 if (cat->appender->free_)
465 cat->appender->free_(cat->appender);
466 xbt_free(cat->appender);
471 void xbt_log_layout_set(xbt_log_category_t cat, xbt_log_layout_t lay)
473 DISABLE_XBT_LOG_CAT_INIT();
474 if (not cat->appender) {
475 XBT_VERB ("No appender to category %s. Setting the file appender as default", cat->name);
476 xbt_log_appender_set(cat, xbt_log_appender_file_new(nullptr));
479 if (cat->layout->free_) {
480 cat->layout->free_(cat->layout);
482 xbt_free(cat->layout);
485 xbt_log_additivity_set(cat, 0);
488 void xbt_log_additivity_set(xbt_log_category_t cat, int additivity)
490 cat->additivity = additivity;
493 static void xbt_log_help()
496 "Description of the logging output:\n"
498 " Threshold configuration: --log=CATEGORY_NAME.thres:PRIORITY_LEVEL\n"
499 " CATEGORY_NAME: defined in code with function 'XBT_LOG_NEW_CATEGORY'\n"
500 " PRIORITY_LEVEL: the level to print (trace,debug,verbose,info,warning,error,critical)\n"
501 " -> trace: enter and return of some functions\n"
502 " -> debug: crufty output\n"
503 " -> verbose: verbose output for the user wanting more\n"
504 " -> info: output about the regular functioning\n"
505 " -> warning: minor issue encountered\n"
506 " -> error: issue encountered\n"
507 " -> critical: major issue encountered\n"
508 " The default priority level is 'info'.\n"
510 " Format configuration: --log=CATEGORY_NAME.fmt:FORMAT\n"
511 " FORMAT string may contain:\n"
512 " -> %%%%: the %% char\n"
513 " -> %%n: platform-dependent line separator (LOG4J compatible)\n"
514 " -> %%e: plain old space (SimGrid extension)\n"
516 " -> %%m: user-provided message\n"
518 " -> %%c: Category name (LOG4J compatible)\n"
519 " -> %%p: Priority name (LOG4J compatible)\n"
521 " -> %%h: Hostname (SimGrid extension)\n"
522 " -> %%a: Actor name (SimGrid extension)\n"
523 " -> %%t: Thread \"name\" (LOG4J compatible -- actually the address of the thread in memory)\n"
524 " -> %%i: Process PID (SimGrid extension -- this is a 'i' as in 'i'dea)\n"
526 " -> %%F: file name where the log event was raised (LOG4J compatible)\n"
527 " -> %%l: location where the log event was raised (LOG4J compatible, like '%%F:%%L' -- this is a l as "
529 " -> %%L: line number where the log event was raised (LOG4J compatible)\n"
530 " -> %%M: function name (LOG4J compatible -- called method name here of course).\n"
532 " -> %%b: full backtrace (Called %%throwable in LOG4J). Defined only when using the GNU libc because\n"
533 " backtrace() is not defined elsewhere.\n"
534 " -> %%B: short backtrace (only the first line of the %%b). Called %%throwable{short} in LOG4J; "
535 "defined where %%b is.\n"
537 " -> %%d: date (UNIX-like epoch)\n"
538 " -> %%r: application age (time elapsed since the beginning of the application)\n"
540 " Category appender: --log=CATEGORY_NAME.app:APPENDER\n"
541 " APPENDER may be:\n"
542 " -> stdout or stderr: standard output streams\n"
543 " -> file:NAME: append to file with given name\n"
544 " -> splitfile:SIZE:NAME: append to files with maximum size SIZE per file.\n"
545 " NAME may contain the %% wildcard as a placeholder for the file number.\n"
546 " -> rollfile:SIZE:NAME: append to file with maximum size SIZE.\n"
548 " Category additivity: --log=CATEGORY_NAME.add:VALUE\n"
549 " VALUE: '0', '1', 'no', 'yes', 'on', or 'off'\n"
552 " --help-log-categories Display the current hierarchy of log categories.\n"
553 " --log=no_loc Don't print file names in messages (for tesh tests).\n");
556 static void xbt_log_help_categories_rec(xbt_log_category_t category, const std::string& prefix)
561 std::string this_prefix(prefix);
562 std::string child_prefix(prefix);
563 if (category->parent) {
564 this_prefix += " \\_ ";
565 child_prefix += " | ";
568 std::vector<xbt_log_category_t> cats;
569 for (xbt_log_category_t cat = category; cat != nullptr; cat = cat->nextSibling)
572 std::sort(begin(cats), end(cats),
573 [](const s_xbt_log_category_t* a, const s_xbt_log_category_t* b) { return strcmp(a->name, b->name) < 0; });
575 for (auto const& cat : cats) {
576 XBT_HELP("%s%s: %s", this_prefix.c_str(), cat->name, cat->description);
577 if (cat == cats.back() && category->parent)
578 child_prefix[child_prefix.rfind('|')] = ' ';
579 xbt_log_help_categories_rec(cat->firstChild, child_prefix);
583 static void xbt_log_help_categories()
585 XBT_HELP("Current log category hierarchy:");
586 xbt_log_help_categories_rec(&_XBT_LOGV(XBT_LOG_ROOT_CAT), " ");