1 /* Copyright (c) 2004-2019. 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 const char* true_values[] = {
42 "yes", "on", "true", "1"
44 const char* false_values[] = {
45 "no", "off", "false", "0"
48 static bool parse_bool(const char* value)
50 for (const char* const& true_value : true_values)
51 if (std::strcmp(true_value, value) == 0)
53 for (const char* const& false_value : false_values)
54 if (std::strcmp(false_value, value) == 0)
56 throw std::range_error("not a boolean");
59 static double parse_double(const char* value)
63 double res = std::strtod(value, &end);
65 throw std::range_error("out of range");
67 xbt_die("Unexpected errno");
68 if (end == value || *end != '\0')
69 throw std::range_error("invalid double");
74 static long int parse_long(const char* value)
78 long int res = std::strtol(value, &end, 0);
80 if (res == LONG_MIN && errno == ERANGE)
81 throw std::range_error("underflow");
82 else if (res == LONG_MAX && errno == ERANGE)
83 throw std::range_error("overflow");
84 xbt_die("Unexpected errno");
86 if (end == value || *end != '\0')
87 throw std::range_error("invalid integer");
92 // ***** ConfigType *****
94 /// A trait which define possible options types:
95 template <class T> class ConfigType;
97 template <> class ConfigType<int> {
99 static constexpr const char* type_name = "int";
100 static inline double parse(const char* value)
102 return parse_long(value);
105 template <> class ConfigType<double> {
107 static constexpr const char* type_name = "double";
108 static inline double parse(const char* value)
110 return parse_double(value);
113 template <> class ConfigType<std::string> {
115 static constexpr const char* type_name = "string";
116 static inline std::string parse(const char* value)
118 return std::string(value);
121 template <> class ConfigType<bool> {
123 static constexpr const char* type_name = "boolean";
124 static inline bool parse(const char* value)
126 return parse_bool(value);
130 // **** Forward declarations ****
132 class ConfigurationElement ;
133 template<class T> class TypedConfigurationElement;
135 // **** ConfigurationElement ****
137 class ConfigurationElement {
141 bool isdefault = true;
145 xbt_cfg_cb_t old_callback = nullptr;
147 ConfigurationElement(const std::string& key, const std::string& desc) : key(key), desc(desc) {}
148 ConfigurationElement(const std::string& key, const std::string& desc, xbt_cfg_cb_t cb)
149 : key(key), desc(desc), old_callback(cb)
153 virtual ~ConfigurationElement() = default;
155 virtual std::string get_string_value() = 0;
156 virtual void set_string_value(const char* value) = 0;
157 virtual const char* get_type_name() = 0;
159 template <class T> T const& get_value() const
161 return static_cast<const TypedConfigurationElement<T>&>(*this).get_value();
163 template <class T> void set_value(T value)
165 static_cast<TypedConfigurationElement<T>&>(*this).set_value(std::move(value));
167 template <class T> void set_default_value(T value)
169 static_cast<TypedConfigurationElement<T>&>(*this).set_default_value(std::move(value));
171 void unset_default() { isdefault = false; }
172 bool is_default() const { return isdefault; }
174 std::string const& get_description() const { return desc; }
175 std::string const& get_key() const { return key; }
178 // **** TypedConfigurationElement<T> ****
180 // TODO, could we use boost::any with some Type* reference?
182 class TypedConfigurationElement : public ConfigurationElement {
185 std::function<void(T&)> callback;
188 TypedConfigurationElement(const std::string& key, const std::string& desc, T value = T())
189 : ConfigurationElement(key, desc), content(std::move(value))
191 TypedConfigurationElement(const std::string& key, const std::string& desc, T value, xbt_cfg_cb_t cb)
192 : ConfigurationElement(key, desc, cb), content(std::move(value))
194 TypedConfigurationElement(const std::string& key, const std::string& desc, T value, std::function<void(T&)> callback)
195 : ConfigurationElement(key, desc), content(std::move(value)), callback(std::move(callback))
197 ~TypedConfigurationElement() = default;
199 std::string get_string_value() override;
200 const char* get_type_name() override;
201 void set_string_value(const char* value) override;
206 this->old_callback(get_key().c_str());
208 this->callback(this->content);
211 T const& get_value() const { return content; }
213 void set_value(T value)
215 this->content = std::move(value);
217 this->unset_default();
220 void set_default_value(T value)
222 if (this->is_default()) {
223 this->content = std::move(value);
226 XBT_DEBUG("Do not override configuration variable '%s' with value '%s' because it was already set.",
227 get_key().c_str(), to_string(value).c_str());
232 template <class T> std::string TypedConfigurationElement<T>::get_string_value() // override
234 return to_string(content);
237 template <class T> void TypedConfigurationElement<T>::set_string_value(const char* value) // override
239 this->content = ConfigType<T>::parse(value);
240 this->unset_default();
244 template <class T> const char* TypedConfigurationElement<T>::get_type_name() // override
246 return ConfigType<T>::type_name;
249 } // end of anonymous namespace
255 // name -> ConfigElement:
256 std::map<std::string, std::unique_ptr<simgrid::config::ConfigurationElement>> options;
257 // alias -> ConfigElement from options:
258 std::map<std::string, simgrid::config::ConfigurationElement*> aliases;
259 bool warn_for_aliases = true;
265 Config(Config const&) = delete;
266 Config& operator=(Config const&) = delete;
268 ConfigurationElement& operator[](const std::string& name);
269 void alias(const std::string& realname, const std::string& aliasname);
271 template <class T, class... A>
272 simgrid::config::TypedConfigurationElement<T>* register_option(const std::string& name, A&&... a)
274 xbt_assert(options.find(name) == options.end(), "Refusing to register the config element '%s' twice.",
276 TypedConfigurationElement<T>* variable = new TypedConfigurationElement<T>(name, std::forward<A>(a)...);
277 XBT_DEBUG("Register cfg elm %s (%s) of type %s @%p in set %p)", name.c_str(), variable->get_description().c_str(),
278 variable->get_type_name(), variable, this);
279 options.emplace(name, variable);
285 void dump(const char *name, const char *indent);
290 ConfigurationElement* get_dict_element(const std::string& name);
295 atexit(&sg_config_finalize);
298 inline ConfigurationElement* Config::get_dict_element(const std::string& name)
300 auto opt = options.find(name);
301 if (opt != options.end()) {
302 return opt->second.get();
304 auto als = aliases.find(name);
305 if (als != aliases.end()) {
306 ConfigurationElement* res = als->second;
307 if (warn_for_aliases)
308 XBT_INFO("Option %s has been renamed to %s. Consider switching.", name.c_str(), res->get_key().c_str());
311 THROWF(not_found_error, 0, "Bad config key: %s", name.c_str());
316 inline ConfigurationElement& Config::operator[](const std::string& name)
318 return *(get_dict_element(name));
321 void Config::alias(const std::string& realname, const std::string& aliasname)
323 xbt_assert(aliases.find(aliasname) == aliases.end(), "Alias '%s' already.", aliasname.c_str());
324 ConfigurationElement* element = this->get_dict_element(realname);
325 xbt_assert(element, "Cannot define an alias to the non-existing option '%s'.", realname.c_str());
326 this->aliases.insert({aliasname, element});
329 /** @brief Dump a config set for debuging purpose
331 * @param name The name to give to this config set
332 * @param indent what to write at the beginning of each line (right number of spaces)
334 void Config::dump(const char *name, const char *indent)
336 XBT_LOG_DEFAULT_CATEGORY(xbt_help);
338 XBT_VERB("%s>> Dumping of the config set '%s':", indent, name);
340 for (auto const& elm : options)
341 XBT_VERB("%s %s: ()%s) %s", indent, elm.first.c_str(), elm.second->get_type_name(),
342 elm.second->get_string_value().c_str());
345 XBT_VERB("%s<< End of the config set '%s'", indent, name);
348 /** @brief Displays the declared aliases and their replacement */
349 void Config::show_aliases()
351 for (auto const& elm : aliases)
352 XBT_HELP(" %-40s %s", elm.first.c_str(), elm.second->get_key().c_str());
355 /** @brief Displays the declared options and their description */
358 for (auto const& elm : options) {
359 simgrid::config::ConfigurationElement* variable = elm.second.get();
360 XBT_HELP(" %s: %s", elm.first.c_str(), variable->get_description().c_str());
361 XBT_HELP(" Type: %s; Current value: %s", variable->get_type_name(), variable->get_string_value().c_str());
365 // ***** set_default *****
367 template <class T> XBT_PUBLIC void set_default(const char* name, T value)
369 (*simgrid_config)[name].set_default_value<T>(std::move(value));
372 template XBT_PUBLIC void set_default<int>(const char* name, int value);
373 template XBT_PUBLIC void set_default<double>(const char* name, double value);
374 template XBT_PUBLIC void set_default<bool>(const char* name, bool value);
375 template XBT_PUBLIC void set_default<std::string>(const char* name, std::string value);
377 bool is_default(const char* name)
379 return (*simgrid_config)[name].is_default();
382 // ***** set_value *****
384 template <class T> XBT_PUBLIC void set_value(const char* name, T value)
386 (*simgrid_config)[name].set_value<T>(std::move(value));
389 template XBT_PUBLIC void set_value<int>(const char* name, int value);
390 template XBT_PUBLIC void set_value<double>(const char* name, double value);
391 template XBT_PUBLIC void set_value<bool>(const char* name, bool value);
392 template XBT_PUBLIC void set_value<std::string>(const char* name, std::string value);
394 void set_as_string(const char* name, const std::string& value)
396 (*simgrid_config)[name].set_string_value(value.c_str());
399 void set_parse(const std::string& opt)
401 std::string options(opt);
402 XBT_DEBUG("List to parse and set:'%s'", options.c_str());
403 while (not options.empty()) {
404 XBT_DEBUG("Still to parse and set: '%s'", options.c_str());
407 size_t pos = options.find_first_not_of(" \t\n,");
408 options.erase(0, pos);
410 pos = options.find_first_of(" \t\n,");
411 std::string name = options.substr(0, pos);
412 options.erase(0, pos);
413 XBT_DEBUG("parse now:'%s'; parse later:'%s'", name.c_str(), options.c_str());
418 pos = name.find(':');
419 xbt_assert(pos != std::string::npos, "Option '%s' badly formatted. Should be of the form 'name:value'",
422 std::string val = name.substr(pos + 1);
425 const std::string path("path");
426 if (name.compare(0, path.length(), path) != 0)
427 XBT_INFO("Configuration change: Set '%s' to '%s'", name.c_str(), val.c_str());
429 set_as_string(name.c_str(), val);
433 // ***** get_value *****
435 template <class T> XBT_PUBLIC T const& get_value(const std::string& name)
437 return (*simgrid_config)[name].get_value<T>();
440 template XBT_PUBLIC int const& get_value<int>(const std::string& name);
441 template XBT_PUBLIC double const& get_value<double>(const std::string& name);
442 template XBT_PUBLIC bool const& get_value<bool>(const std::string& name);
443 template XBT_PUBLIC std::string const& get_value<std::string>(const std::string& name);
447 void alias(const char* realname, std::initializer_list<const char*> aliases)
449 for (auto const& aliasname : aliases)
450 simgrid_config->alias(realname, aliasname);
453 // ***** declare_flag *****
456 XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, T value,
457 std::function<void(const T&)> callback)
459 if (simgrid_config == nullptr)
460 simgrid_config = new simgrid::config::Config();
461 simgrid_config->register_option<T>(name, description, std::move(value), std::move(callback));
464 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, int value,
465 std::function<void(int const&)> callback);
466 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, double value,
467 std::function<void(double const&)> callback);
468 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, bool value,
469 std::function<void(bool const&)> callback);
470 template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, std::string value,
471 std::function<void(std::string const&)> callback);
475 delete simgrid_config;
476 simgrid_config = nullptr;
481 simgrid_config->show_aliases();
486 simgrid_config->help();
491 /*----[ Setting ]---------------------------------------------------------*/
493 /** @brief Set an integer value to \a name within \a cfg
495 * @param key the name of the variable
496 * @param value the value of the variable
498 void xbt_cfg_set_int(const char *key, int value)
500 (*simgrid_config)[key].set_value<int>(value);
503 /** @brief Set or add a double value to \a name within \a cfg
505 * @param key the name of the variable
506 * @param value the double to set
508 void xbt_cfg_set_double(const char *key, double value)
510 (*simgrid_config)[key].set_value<double>(value);
513 /** @brief Set or add a string value to \a name within \a cfg
515 * @param key the name of the variable
516 * @param value the value to be added
519 void xbt_cfg_set_string(const char* key, const char* value)
521 (*simgrid_config)[key].set_value<std::string>(value);
524 /** @brief Set or add a boolean value to \a name within \a cfg
526 * @param key the name of the variable
527 * @param value the value of the variable
529 void xbt_cfg_set_boolean(const char *key, const char *value)
531 (*simgrid_config)[key].set_value<bool>(simgrid::config::parse_bool(value));
534 /*----[ Getting ]---------------------------------------------------------*/
535 /** @brief Retrieve an integer value of a variable (get a warning if not uniq)
537 * @param key the name of the variable
539 * Returns the first value from the config set under the given name.
541 int xbt_cfg_get_int(const char *key)
543 return (*simgrid_config)[key].get_value<int>();
546 /** @brief Retrieve a double value of a variable (get a warning if not uniq)
548 * @param key the name of the variable
550 * Returns the first value from the config set under the given name.
552 double xbt_cfg_get_double(const char *key)
554 return (*simgrid_config)[key].get_value<double>();
557 /** @brief Retrieve a boolean value of a variable (get a warning if not uniq)
559 * @param key the name of the variable
561 * Returns the first value from the config set under the given name.
562 * If there is more than one value, it will issue a warning.
564 int xbt_cfg_get_boolean(const char *key)
566 return (*simgrid_config)[key].get_value<bool>() ? 1 : 0;