1 /* Copyright (c) 2004-2021. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
19 #include <type_traits>
23 #include "simgrid/Exception.hpp"
24 #include "simgrid/sg_config.hpp"
25 #include "xbt/dynar.h"
28 #include "xbt/sysdep.h"
29 #include <xbt/config.h>
30 #include <xbt/config.hpp>
32 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_cfg, xbt, "configuration support");
34 XBT_EXPORT_NO_IMPORT xbt_cfg_t simgrid_config = nullptr;
41 bool parse_bool(const char* value)
43 for (const char* true_value : {"yes", "on", "true", "1"})
44 if (std::strcmp(true_value, value) == 0)
46 for (const char* false_value : {"no", "off", "false", "0"})
47 if (std::strcmp(false_value, value) == 0)
49 throw std::range_error("not a boolean");
52 double parse_double(const char* value)
56 double res = std::strtod(value, &end);
58 throw std::range_error("out of range");
59 xbt_assert(errno == 0, "Unexpected errno: %d", errno);
60 if (end == value || *end != '\0')
61 throw std::range_error("invalid double");
65 long int parse_long(const char* value)
69 long int res = std::strtol(value, &end, 0);
71 throw std::range_error(res == LONG_MIN ? "underflow" : "overflow");
72 xbt_assert(errno == 0, "Unexpected errno: %d", errno);
73 if (end == value || *end != '\0')
74 throw std::range_error("invalid integer");
78 // ***** ConfigType *****
80 /// A trait which define possible options types:
81 template <class T> class ConfigType;
83 template <> class ConfigType<int> {
85 static constexpr const char* type_name = "int";
86 static inline int parse(const char* value)
88 long val = parse_long(value);
90 throw std::range_error("underflow");
92 throw std::range_error("overflow");
93 return static_cast<int>(val);
96 template <> class ConfigType<double> {
98 static constexpr const char* type_name = "double";
99 static inline double parse(const char* value)
101 return parse_double(value);
104 template <> class ConfigType<std::string> {
106 static constexpr const char* type_name = "string";
107 static inline std::string parse(const char* value)
109 return std::string(value);
112 template <> class ConfigType<bool> {
114 static constexpr const char* type_name = "boolean";
115 static inline bool parse(const char* value)
117 return parse_bool(value);
121 // **** Forward declarations ****
123 class ConfigurationElement ;
124 template<class T> class TypedConfigurationElement;
126 // **** ConfigurationElement ****
128 class ConfigurationElement {
132 bool isdefault = true;
135 ConfigurationElement(const std::string& key, const std::string& desc) : key(key), desc(desc) {}
137 virtual ~ConfigurationElement() = default;
139 virtual std::string get_string_value() = 0;
140 virtual void set_string_value(const char* value) = 0;
141 virtual const char* get_type_name() = 0;
143 template <class T> T const& get_value() const
145 return static_cast<const TypedConfigurationElement<T>&>(*this).get_value();
147 template <class T> void set_value(T value)
149 static_cast<TypedConfigurationElement<T>&>(*this).set_value(std::move(value));
151 template <class T> void set_default_value(T value)
153 static_cast<TypedConfigurationElement<T>&>(*this).set_default_value(std::move(value));
155 void unset_default() { isdefault = false; }
156 bool is_default() const { return isdefault; }
158 std::string const& get_description() const { return desc; }
159 std::string const& get_key() const { return key; }
162 // **** TypedConfigurationElement<T> ****
164 // TODO, could we use boost::any with some Type* reference?
166 class TypedConfigurationElement : public ConfigurationElement {
169 std::function<void(T&)> callback;
172 TypedConfigurationElement(const std::string& key, const std::string& desc, T value = T())
173 : ConfigurationElement(key, desc), content(std::move(value))
175 TypedConfigurationElement(const std::string& key, const std::string& desc, T value, std::function<void(T&)> callback)
176 : ConfigurationElement(key, desc), content(std::move(value)), callback(std::move(callback))
179 std::string get_string_value() override;
180 const char* get_type_name() override;
181 void set_string_value(const char* value) override;
186 this->callback(this->content);
189 T const& get_value() const { return content; }
191 void set_value(T value)
193 this->content = std::move(value);
195 this->unset_default();
198 void set_default_value(T value)
200 if (this->is_default()) {
201 this->content = std::move(value);
204 XBT_DEBUG("Do not override configuration variable '%s' with value '%s' because it was already set.",
205 get_key().c_str(), get_string_value().c_str());
210 template <class T> std::string TypedConfigurationElement<T>::get_string_value() // override
212 return to_string(content);
215 template <> std::string TypedConfigurationElement<double>::get_string_value() // override
217 // don't want std::to_string which uses %f, and formats very small values as 0.000000
218 return xbt::string_printf("%g", content);
221 template <class T> void TypedConfigurationElement<T>::set_string_value(const char* value) // override
223 this->content = ConfigType<T>::parse(value);
224 this->unset_default();
228 template <class T> const char* TypedConfigurationElement<T>::get_type_name() // override
230 return ConfigType<T>::type_name;
233 } // end of anonymous namespace
239 // name -> ConfigElement:
240 std::map<std::string, std::unique_ptr<ConfigurationElement>, std::less<>> options;
241 // alias -> ConfigElement from options:
242 std::map<std::string, ConfigurationElement*, std::less<>> aliases;
243 bool warn_for_aliases = true;
249 Config(Config const&) = delete;
250 Config& operator=(Config const&) = delete;
252 ConfigurationElement& operator[](const std::string& name);
253 void alias(const std::string& realname, const std::string& aliasname);
255 template <class T, class... A> TypedConfigurationElement<T>* register_option(const std::string& name, A&&... a)
257 xbt_assert(options.find(name) == options.end(), "Refusing to register the config element '%s' twice.",
259 auto* variable = new TypedConfigurationElement<T>(name, std::forward<A>(a)...);
260 XBT_DEBUG("Register cfg elm %s (%s) of type %s @%p in set %p)", name.c_str(), variable->get_description().c_str(),
261 variable->get_type_name(), variable, this);
262 options[name].reset(variable);
268 void dump(const char* name, const char* indent) const;
269 void show_aliases() const;
273 ConfigurationElement* get_dict_element(const std::string& name);
278 atexit(&sg_config_finalize);
281 inline ConfigurationElement* Config::get_dict_element(const std::string& name)
283 auto opt = options.find(name);
284 if (opt != options.end()) {
285 return opt->second.get();
287 auto als = aliases.find(name);
288 if (als != aliases.end()) {
289 ConfigurationElement* res = als->second;
290 if (warn_for_aliases)
291 XBT_INFO("Option %s has been renamed to %s. Consider switching.", name.c_str(), res->get_key().c_str());
294 std::string msg = "Bad config key: " + name + "\nExisting config keys:\n";
295 for (auto const& elm : options)
296 msg += " " + elm.first + ": (" + elm.second->get_type_name() + ")" + elm.second->get_string_value() + "\n";
297 throw std::out_of_range(msg);
302 inline ConfigurationElement& Config::operator[](const std::string& name)
304 return *(get_dict_element(name));
307 void Config::alias(const std::string& realname, const std::string& aliasname)
309 xbt_assert(aliases.find(aliasname) == aliases.end(), "Alias '%s' already.", aliasname.c_str());
310 ConfigurationElement* element = this->get_dict_element(realname);
311 xbt_assert(element, "Cannot define an alias to the non-existing option '%s'.", realname.c_str());
312 this->aliases.insert({aliasname, element});
315 /** @brief Dump a config set for debugging purpose
317 * @param name The name to give to this config set
318 * @param indent what to write at the beginning of each line (right number of spaces)
320 void Config::dump(const char* name, const char* indent) const
323 XBT_CVERB(xbt_help, "%s>> Dumping of the config set '%s':", indent, name);
325 for (auto const& elm : options)
326 XBT_CVERB(xbt_help, "%s %s: ()%s) %s", indent, elm.first.c_str(), elm.second->get_type_name(),
327 elm.second->get_string_value().c_str());
330 XBT_CVERB(xbt_help, "%s<< End of the config set '%s'", indent, name);
333 /** @brief Displays the declared aliases and their replacement */
334 void Config::show_aliases() const
336 for (auto const& elm : aliases)
337 XBT_HELP(" %-40s %s", elm.first.c_str(), elm.second->get_key().c_str());
340 /** @brief Displays the declared options and their description */
341 void Config::help() const
343 for (auto const& elm : options) {
344 simgrid::config::ConfigurationElement* variable = elm.second.get();
345 XBT_HELP(" %s: %s", elm.first.c_str(), variable->get_description().c_str());
346 XBT_HELP(" Type: %s; Current value: %s", variable->get_type_name(), variable->get_string_value().c_str());
350 // ***** set_default *****
352 template <class T> XBT_PUBLIC void set_default(const char* name, T value)
354 (*simgrid_config)[name].set_default_value<T>(std::move(value));
357 template XBT_PUBLIC void set_default<int>(const char* name, int value);
358 template XBT_PUBLIC void set_default<double>(const char* name, double value);
359 template XBT_PUBLIC void set_default<bool>(const char* name, bool value);
360 template XBT_PUBLIC void set_default<std::string>(const char* name, std::string value);
362 bool is_default(const char* name)
364 return (*simgrid_config)[name].is_default();
367 // ***** set_value *****
369 template <class T> XBT_PUBLIC void set_value(const char* name, T value)
371 (*simgrid_config)[name].set_value<T>(std::move(value));
374 template XBT_PUBLIC void set_value<int>(const char* name, int value);
375 template XBT_PUBLIC void set_value<double>(const char* name, double value);
376 template XBT_PUBLIC void set_value<bool>(const char* name, bool value);
377 template XBT_PUBLIC void set_value<std::string>(const char* name, std::string value);
379 void set_as_string(const char* name, const std::string& value)
381 (*simgrid_config)[name].set_string_value(value.c_str());
384 void set_parse(const std::string& opt)
386 std::string options(opt);
387 XBT_DEBUG("List to parse and set:'%s'", options.c_str());
388 while (not options.empty()) {
389 XBT_DEBUG("Still to parse and set: '%s'", options.c_str());
392 size_t pos = options.find_first_not_of(" \t\n,");
393 options.erase(0, pos);
395 pos = options.find_first_of(" \t\n,");
396 std::string name = options.substr(0, pos);
397 options.erase(0, pos);
398 XBT_DEBUG("parse now:'%s'; parse later:'%s'", name.c_str(), options.c_str());
403 pos = name.find(':');
404 xbt_assert(pos != std::string::npos, "Option '%s' badly formatted. Should be of the form 'name:value'",
407 std::string val = name.substr(pos + 1);
410 const std::string path("path");
411 if (name.compare(0, path.length(), path) != 0)
412 XBT_INFO("Configuration change: Set '%s' to '%s'", name.c_str(), val.c_str());
414 set_as_string(name.c_str(), val);
418 // ***** get_value *****
420 template <class T> XBT_PUBLIC T const& get_value(const std::string& name)
422 return (*simgrid_config)[name].get_value<T>();
425 template XBT_PUBLIC int const& get_value<int>(const std::string& name);
426 template XBT_PUBLIC double const& get_value<double>(const std::string& name);
427 template XBT_PUBLIC bool const& get_value<bool>(const std::string& name);
428 template XBT_PUBLIC std::string const& get_value<std::string>(const std::string& name);
432 void alias(const char* realname, std::initializer_list<const char*> aliases)
434 for (auto const& aliasname : aliases)
435 simgrid_config->alias(realname, aliasname);
438 // ***** declare_flag *****
441 XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, T value,
442 std::function<void(const T&)> callback)
444 if (simgrid_config == nullptr)
445 simgrid_config = new simgrid::config::Config();
446 simgrid_config->register_option<T>(name, description, std::move(value), std::move(callback));
449 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, int value,
450 std::function<void(int const&)> callback);
451 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, double value,
452 std::function<void(double const&)> callback);
453 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, bool value,
454 std::function<void(bool const&)> callback);
455 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, std::string value,
456 std::function<void(std::string const&)> callback);
460 delete simgrid_config;
461 simgrid_config = nullptr;
466 simgrid_config->show_aliases();
471 simgrid_config->help();
476 /*----[ Setting ]---------------------------------------------------------*/
478 /** @brief Set an integer value to \a name within \a cfg
480 * @param key the name of the variable
481 * @param value the value of the variable
483 void sg_cfg_set_int(const char* key, int value)
485 (*simgrid_config)[key].set_value<int>(value);
488 /** @brief Set or add a double value to \a name within \a cfg
490 * @param key the name of the variable
491 * @param value the double to set
493 void sg_cfg_set_double(const char* key, double value)
495 (*simgrid_config)[key].set_value<double>(value);
498 /** @brief Set or add a string value to \a name within \a cfg
500 * @param key the name of the variable
501 * @param value the value to be added
504 void sg_cfg_set_string(const char* key, const char* value)
506 (*simgrid_config)[key].set_value<std::string>(value);
509 /** @brief Set or add a boolean value to \a name within \a cfg
511 * @param key the name of the variable
512 * @param value the value of the variable
514 void sg_cfg_set_boolean(const char* key, const char* value)
516 (*simgrid_config)[key].set_value<bool>(simgrid::config::parse_bool(value));
519 /*----[ Getting ]---------------------------------------------------------*/
520 /** @brief Retrieve an integer value of a variable (get a warning if not uniq)
522 * @param key the name of the variable
524 * Returns the first value from the config set under the given name.
526 int sg_cfg_get_int(const char* key)
528 return (*simgrid_config)[key].get_value<int>();
531 /** @brief Retrieve a double value of a variable (get a warning if not uniq)
533 * @param key the name of the variable
535 * Returns the first value from the config set under the given name.
537 double sg_cfg_get_double(const char* key)
539 return (*simgrid_config)[key].get_value<double>();
542 /** @brief Retrieve a boolean value of a variable (get a warning if not uniq)
544 * @param key the name of the variable
546 * Returns the first value from the config set under the given name.
547 * If there is more than one value, it will issue a warning.
549 int sg_cfg_get_boolean(const char* key)
551 return (*simgrid_config)[key].get_value<bool>() ? 1 : 0;