include/logging/log.h

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef ZEPHYR_INCLUDE_LOGGING_LOG_H_
#define ZEPHYR_INCLUDE_LOGGING_LOG_H_

#include <logging/log_instance.h>
#include <logging/log_core.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Logging
 * @defgroup logging Logging
 * @{
 * @}
 */

/**
 * @brief Logger API
 * @defgroup log_api Logging API
 * @ingroup logger
 * @{
 */

/**
 * @brief Writes an ERROR level message to the log.
 *
 * @details It's meant to report severe errors, such as those from which it's
 * not possible to recover.
 *
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_ERR(...)    Z_LOG(LOG_LEVEL_ERR, __VA_ARGS__)

/**
 * @brief Writes a WARNING level message to the log.
 *
 * @details It's meant to register messages related to unusual situations that
 * are not necessarily errors.
 *
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_WRN(...)   Z_LOG(LOG_LEVEL_WRN, __VA_ARGS__)

/**
 * @brief Writes an INFO level message to the log.
 *
 * @details It's meant to write generic user oriented messages.
 *
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_INF(...)   Z_LOG(LOG_LEVEL_INF, __VA_ARGS__)

/**
 * @brief Writes a DEBUG level message to the log.
 *
 * @details It's meant to write developer oriented information.
 *
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_DBG(...)    Z_LOG(LOG_LEVEL_DBG, __VA_ARGS__)

/**
 * @brief Writes an ERROR level message associated with the instance to the log.
 *
 * Message is associated with specific instance of the module which has
 * independent filtering settings (if runtime filtering is enabled) and
 * message prefix (\<module_name\>.\<instance_name\>). It's meant to report
 * severe errors, such as those from which it's not possible to recover.
 *
 * @param _log_inst Pointer to the log structure associated with the instance.
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_INST_ERR(_log_inst, ...) \
	Z_LOG_INSTANCE(LOG_LEVEL_ERR, _log_inst, __VA_ARGS__)

/**
 * @brief Writes a WARNING level message associated with the instance to the
 *        log.
 *
 * Message is associated with specific instance of the module which has
 * independent filtering settings (if runtime filtering is enabled) and
 * message prefix (\<module_name\>.\<instance_name\>). It's meant to register
 * messages related to unusual situations that are not necessarily errors.
 *
 * @param _log_inst Pointer to the log structure associated with the instance.
 * @param ...       A string optionally containing printk valid conversion
 *                  specifier, followed by as many values as specifiers.
 */
#define LOG_INST_WRN(_log_inst, ...) \
	Z_LOG_INSTANCE(LOG_LEVEL_WRN, _log_inst, __VA_ARGS__)

/**
 * @brief Writes an INFO level message associated with the instance to the log.
 *
 * Message is associated with specific instance of the module which has
 * independent filtering settings (if runtime filtering is enabled) and
 * message prefix (\<module_name\>.\<instance_name\>). It's meant to write
 * generic user oriented messages.
 *
 * @param _log_inst Pointer to the log structure associated with the instance.
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_INST_INF(_log_inst, ...) \
	Z_LOG_INSTANCE(LOG_LEVEL_INF, _log_inst, __VA_ARGS__)

/**
 * @brief Writes a DEBUG level message associated with the instance to the log.
 *
 * Message is associated with specific instance of the module which has
 * independent filtering settings (if runtime filtering is enabled) and
 * message prefix (\<module_name\>.\<instance_name\>). It's meant to write
 * developer oriented information.
 *
 * @param _log_inst Pointer to the log structure associated with the instance.
 * @param ... A string optionally containing printk valid conversion specifier,
 * followed by as many values as specifiers.
 */
#define LOG_INST_DBG(_log_inst, ...) \
	Z_LOG_INSTANCE(LOG_LEVEL_DBG, _log_inst, __VA_ARGS__)

/**
 * @brief Writes an ERROR level hexdump message to the log.
 *
 * @details It's meant to report severe errors, such as those from which it's
 * not possible to recover.
 *
 * @param _data   Pointer to the data to be logged.
 * @param _length Length of data (in bytes).
 * @param _str    Persistent, raw string.
 */
#define LOG_HEXDUMP_ERR(_data, _length, _str) \
	Z_LOG_HEXDUMP(LOG_LEVEL_ERR, _data, _length, _str)

/**
 * @brief Writes a WARNING level message to the log.
 *
 * @details It's meant to register messages related to unusual situations that
 * are not necessarily errors.
 *
 * @param _data   Pointer to the data to be logged.
 * @param _length Length of data (in bytes).
 * @param _str    Persistent, raw string.
 */
#define LOG_HEXDUMP_WRN(_data, _length, _str) \
	Z_LOG_HEXDUMP(LOG_LEVEL_WRN, _data, _length, _str)

/**
 * @brief Writes an INFO level message to the log.
 *
 * @details It's meant to write generic user oriented messages.
 *
 * @param _data   Pointer to the data to be logged.
 * @param _length Length of data (in bytes).
 * @param _str    Persistent, raw string.
 */
#define LOG_HEXDUMP_INF(_data, _length, _str) \
	Z_LOG_HEXDUMP(LOG_LEVEL_INF, _data, _length, _str)

/**
 * @brief Writes a DEBUG level message to the log.
 *
 * @details It's meant to write developer oriented information.
 *
 * @param _data   Pointer to the data to be logged.
 * @param _length Length of data (in bytes).
 * @param _str    Persistent, raw string.
 */
#define LOG_HEXDUMP_DBG(_data, _length, _str) \
	Z_LOG_HEXDUMP(LOG_LEVEL_DBG, _data, _length, _str)

/**
 * @brief Writes an ERROR hexdump message associated with the instance to the
 *        log.
 *
 * Message is associated with specific instance of the module which has
 * independent filtering settings (if runtime filtering is enabled) and
 * message prefix (\<module_name\>.\<instance_name\>). It's meant to report
 * severe errors, such as those from which it's not possible to recover.
 *
 * @param _log_inst   Pointer to the log structure associated with the instance.
 * @param _data       Pointer to the data to be logged.
 * @param _length     Length of data (in bytes).
 * @param _str        Persistent, raw string.
 */
#define LOG_INST_HEXDUMP_ERR(_log_inst, _data, _length, _str) \
	Z_LOG_HEXDUMP_INSTANCE(LOG_LEVEL_ERR, _log_inst, _data, _length, _str)

/**
 * @brief Writes a WARNING level hexdump message associated with the instance to
 *        the log.
 *
 * @details It's meant to register messages related to unusual situations that
 * are not necessarily errors.
 *
 * @param _log_inst   Pointer to the log structure associated with the instance.
 * @param _data       Pointer to the data to be logged.
 * @param _length     Length of data (in bytes).
 * @param _str        Persistent, raw string.
 */
#define LOG_INST_HEXDUMP_WRN(_log_inst, _data, _length, _str) \
	Z_LOG_HEXDUMP_INSTANCE(LOG_LEVEL_WRN, _log_inst, _data, _length, _str)

/**
 * @brief Writes an INFO level hexdump message associated with the instance to
 *        the log.
 *
 * @details It's meant to write generic user oriented messages.
 *
 * @param _log_inst   Pointer to the log structure associated with the instance.
 * @param _data       Pointer to the data to be logged.
 * @param _length     Length of data (in bytes).
 * @param _str        Persistent, raw string.
 */
#define LOG_INST_HEXDUMP_INF(_log_inst, _data, _length, _str) \
	Z_LOG_HEXDUMP_INSTANCE(LOG_LEVEL_INF, _log_inst, _data, _length, _str)

/**
 * @brief Writes a DEBUG level hexdump message associated with the instance to
 *        the log.
 *
 * @details It's meant to write developer oriented information.
 *
 * @param _log_inst   Pointer to the log structure associated with the instance.
 * @param _data       Pointer to the data to be logged.
 * @param _length     Length of data (in bytes).
 * @param _str        Persistent, raw string.
 */
#define LOG_INST_HEXDUMP_DBG(_log_inst, _data, _length, _str)	\
	Z_LOG_HEXDUMP_INSTANCE(LOG_LEVEL_DBG, _log_inst, _data, _length, _str)

#ifndef CONFIG_LOG_MINIMAL
/**
 * @brief Writes an formatted string to the log.
 *
 * @details Conditionally compiled (see CONFIG_LOG_PRINTK). Function provides
 * printk functionality. It is inefficient compared to standard logging
 * because string formatting is performed in the call context and not deferred
 * to the log processing context (@ref log_process).
 *
 * @param fmt Formatted string to output.
 * @param ap  Variable parameters.
 */
void log_printk(const char *fmt, va_list ap);

/** @brief Copy transient string to a buffer from internal, logger pool.
 *
 * Function should be used when transient string is intended to be logged.
 * Logger allocates a buffer and copies input string returning a pointer to the
 * copy. Logger ensures that buffer is freed when logger message is freed.
 *
 * Depending on configuration, this function may do nothing and just pass
 * along the supplied string pointer. Do not rely on this function to always
 * make a copy!
 *
 * @param str Transient string.
 *
 * @return Copy of the string or default string if buffer could not be
 *	   allocated. String may be truncated if input string does not fit in
 *	   a buffer from the pool (see CONFIG_LOG_STRDUP_MAX_STRING). In
 *	   some configurations, the original string pointer is returned.
 */
char *log_strdup(const char *str);
#else
static inline void log_printk(const char *fmt, va_list ap)
{
	vprintk(fmt, ap);
}

static inline char *log_strdup(const char *str)
{
	return (char *)str;
}
#endif /* CONFIG_LOG_MINIMAL */

#ifdef __cplusplus
}
#define LOG_IN_CPLUSPLUS 1
#endif
/* Macro expects that optionally on second argument local log level is provided.
 * If provided it is returned, otherwise default log level is returned or
 * LOG_LEVEL, if it was locally defined.
 */
#if !defined(CONFIG_LOG)
#define _LOG_LEVEL_RESOLVE(...) LOG_LEVEL_NONE
#else
#define _LOG_LEVEL_RESOLVE(...) \
	Z_LOG_EVAL(LOG_LEVEL, \
		  (GET_ARG_N(2, __VA_ARGS__, LOG_LEVEL)), \
		  (GET_ARG_N(2, __VA_ARGS__, CONFIG_LOG_DEFAULT_LEVEL)))
#endif

/* Return first argument */
#define _LOG_ARG1(arg1, ...) arg1

#define _LOG_MODULE_CONST_DATA_CREATE(_name, _level)			     \
	IF_ENABLED(LOG_IN_CPLUSPLUS, (extern))				     \
	const struct log_source_const_data LOG_ITEM_CONST_DATA(_name)	     \
	__attribute__ ((section("." STRINGIFY(LOG_ITEM_CONST_DATA(_name))))) \
	__attribute__((used)) = {					     \
		.name = STRINGIFY(_name),				     \
		.level = _level						     \
	}

#define _LOG_MODULE_DYNAMIC_DATA_CREATE(_name)				\
	struct log_source_dynamic_data LOG_ITEM_DYNAMIC_DATA(_name)	\
	__attribute__ ((section("." STRINGIFY(				\
				     LOG_ITEM_DYNAMIC_DATA(_name))))	\
				     )					\
	__attribute__((used))

#define _LOG_MODULE_DYNAMIC_DATA_COND_CREATE(_name)		\
	IF_ENABLED(CONFIG_LOG_RUNTIME_FILTERING,		\
		  (_LOG_MODULE_DYNAMIC_DATA_CREATE(_name);))

#define _LOG_MODULE_DATA_CREATE(_name, _level)			\
	_LOG_MODULE_CONST_DATA_CREATE(_name, _level);		\
	_LOG_MODULE_DYNAMIC_DATA_COND_CREATE(_name)

/**
 * @brief Create module-specific state and register the module with Logger.
 *
 * This macro normally must be used after including <logging/log.h> to
 * complete the initialization of the module.
 *
 * Module registration can be skipped in two cases:
 *
 * - The module consists of more than one file, and another file
 *   invokes this macro. (LOG_MODULE_DECLARE() should be used instead
 *   in all of the module's other files.)
 * - Instance logging is used and there is no need to create module entry. In
 *   that case LOG_LEVEL_SET() should be used to set log level used within the
 *   file.
 *
 * Macro accepts one or two parameters:
 * - module name
 * - optional log level. If not provided then default log level is used in
 *  the file.
 *
 * Example usage:
 * - LOG_MODULE_REGISTER(foo, CONFIG_FOO_LOG_LEVEL)
 * - LOG_MODULE_REGISTER(foo)
 *
 *
 * @note The module's state is defined, and the module is registered,
 *       only if LOG_LEVEL for the current source file is non-zero or
 *       it is not defined and CONFIG_LOG_DEFAULT_LEVEL is non-zero.
 *       In other cases, this macro has no effect.
 * @see LOG_MODULE_DECLARE
 */

#define LOG_MODULE_REGISTER(...)					\
	Z_LOG_EVAL(							\
		_LOG_LEVEL_RESOLVE(__VA_ARGS__),			\
		(_LOG_MODULE_DATA_CREATE(GET_ARG_N(1, __VA_ARGS__),	\
				      _LOG_LEVEL_RESOLVE(__VA_ARGS__))),\
		()/*Empty*/						\
	)								\
	LOG_MODULE_DECLARE(__VA_ARGS__)

/**
 * @brief Macro for declaring a log module (not registering it).
 *
 * Modules which are split up over multiple files must have exactly
 * one file use LOG_MODULE_REGISTER() to create module-specific state
 * and register the module with the logger core.
 *
 * The other files in the module should use this macro instead to
 * declare that same state. (Otherwise, LOG_INF() etc. will not be
 * able to refer to module-specific state variables.)
 *
 * Macro accepts one or two parameters:
 * - module name
 * - optional log level. If not provided then default log level is used in
 *  the file.
 *
 * Example usage:
 * - LOG_MODULE_DECLARE(foo, CONFIG_FOO_LOG_LEVEL)
 * - LOG_MODULE_DECLARE(foo)
 *
 * @note The module's state is declared only if LOG_LEVEL for the
 *       current source file is non-zero or it is not defined and
 *       CONFIG_LOG_DEFAULT_LEVEL is non-zero.  In other cases,
 *       this macro has no effect.
 * @see LOG_MODULE_REGISTER
 */
#define LOG_MODULE_DECLARE(...)						      \
	extern const struct log_source_const_data			      \
			LOG_ITEM_CONST_DATA(GET_ARG_N(1, __VA_ARGS__));	      \
	extern struct log_source_dynamic_data				      \
			LOG_ITEM_DYNAMIC_DATA(GET_ARG_N(1, __VA_ARGS__));     \
									      \
	static const struct log_source_const_data *			      \
		__log_current_const_data __unused =			      \
			_LOG_LEVEL_RESOLVE(__VA_ARGS__) ?		      \
			&LOG_ITEM_CONST_DATA(GET_ARG_N(1, __VA_ARGS__)) :     \
			NULL;						      \
									      \
	static struct log_source_dynamic_data *				      \
		__log_current_dynamic_data __unused =			      \
			(_LOG_LEVEL_RESOLVE(__VA_ARGS__) &&		      \
			IS_ENABLED(CONFIG_LOG_RUNTIME_FILTERING)) ?	      \
			&LOG_ITEM_DYNAMIC_DATA(GET_ARG_N(1, __VA_ARGS__)) :   \
			NULL;						      \
									      \
	static const uint32_t __log_level __unused =			      \
					_LOG_LEVEL_RESOLVE(__VA_ARGS__)

/**
 * @brief Macro for setting log level in the file or function where instance
 * logging API is used.
 *
 * @param level Level used in file or in function.
 *
 */
#define LOG_LEVEL_SET(level) static const uint32_t __log_level __unused = \
				Z_LOG_RESOLVED_LEVEL(level, 0)

/**
 * @}
 */

#endif /* ZEPHYR_INCLUDE_LOGGING_LOG_H_ */