[babeltrace.git] / include / babeltrace / assert-internal.h

#ifndef BABELTRACE_ASSERT_INTERNAL_H
#define BABELTRACE_ASSERT_INTERNAL_H

/*
 * Copyright (c) 2018 EfficiOS Inc. and Linux Foundation
 * Copyright (c) 2018 Philippe Proulx <pproulx@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <assert.h>
#include <babeltrace/babeltrace-internal.h>

#ifdef BT_DEBUG_MODE

extern void bt_common_assert_failed(const char *file, int line,
	const char *func, const char *assertion) __attribute__((noreturn));

/*
 * Internal assertion (to detect logic errors on which the library user
 * has no influence). Use BT_ASSERT_PRE() to check a precondition which
 * must be directly or indirectly satisfied by the library user.
 */
#define BT_ASSERT(_cond)                                                       \
	do {                                                                   \
		if (!(_cond)) {                                                \
			bt_common_assert_failed(__FILE__, __LINE__, __func__,  \
				TOSTRING(_cond));                              \
		}                                                              \
	} while (0)

/*
 * Marks a function as being only used within a BT_ASSERT() context.
 */
# define BT_ASSERT_FUNC
#else
/*
 * When BT_DEBUG_MODE is not defined, define BT_ASSERT() macro to the following
 * to trick the compiler into thinking that the variable passed as condition to
 * the assertion is used. This is to prevent set-but-not-used warnings from the
 * compiler when assertions are disabled. The `sizeof` operator also makes sure
 * that the `_cond` expression is not evaluated, thus preventing unwanted side
 * effects.
 *
 * In-depth explanation: https://stackoverflow.com/questions/37411809/how-to-elegantly-fix-this-unused-variable-warning/37412551#37412551
 */
# define BT_ASSERT(_cond)	((void) sizeof((void) (_cond), 0))
# define BT_ASSERT_FUNC		BT_UNUSED
#endif /* BT_DEBUG_MODE */

#endif /* BABELTRACE_ASSERT_INTERNAL_H */
Commit	Line	Data
	1	#ifndef BABELTRACE_ASSERT_INTERNAL_H
	2	#define BABELTRACE_ASSERT_INTERNAL_H
	3
	4	/*
	5	* Copyright (c) 2018 EfficiOS Inc. and Linux Foundation
	6	* Copyright (c) 2018 Philippe Proulx <pproulx@efficios.com>
	7	*
	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
	14	*
	15	* The above copyright notice and this permission notice shall be included in
	16	* all copies or substantial portions of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	21	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	24	* SOFTWARE.
	25	*/
	26
	27	#include <assert.h>
	28	#include <babeltrace/babeltrace-internal.h>
	29
	30	#ifdef BT_DEBUG_MODE
	31
	32	extern void bt_common_assert_failed(const char *file, int line,
	33	const char func, const char assertion) __attribute__((noreturn));
	34
	35	/*
	36	* Internal assertion (to detect logic errors on which the library user
	37	* has no influence). Use BT_ASSERT_PRE() to check a precondition which
	38	* must be directly or indirectly satisfied by the library user.
	39	*/
	40	#define BT_ASSERT(_cond) \
	41	do { \
	42	if (!(_cond)) { \
	43	bt_common_assert_failed(__FILE__, __LINE__, __func__, \
	44	TOSTRING(_cond)); \
	45	} \
	46	} while (0)
	47
	48	/*
	49	* Marks a function as being only used within a BT_ASSERT() context.
	50	*/
	51	# define BT_ASSERT_FUNC
	52	#else
	53	/*
	54	* When BT_DEBUG_MODE is not defined, define BT_ASSERT() macro to the following
	55	* to trick the compiler into thinking that the variable passed as condition to
	56	* the assertion is used. This is to prevent set-but-not-used warnings from the
	57	* compiler when assertions are disabled. The `sizeof` operator also makes sure
	58	* that the `_cond` expression is not evaluated, thus preventing unwanted side
	59	* effects.
	60	*
	61	* In-depth explanation: https://stackoverflow.com/questions/37411809/how-to-elegantly-fix-this-unused-variable-warning/37412551#37412551
	62	*/
	63	# define BT_ASSERT(_cond) ((void) sizeof((void) (_cond), 0))
	64	# define BT_ASSERT_FUNC BT_UNUSED
	65	#endif /* BT_DEBUG_MODE */
	66
	67	#endif /* BABELTRACE_ASSERT_INTERNAL_H */