[lttng-ust.git] / include / ust / bug.h

#ifndef _LTTNG_BUG_H
#define _LTTNG_BUG_H

/*
 * lib/bug.h
 *
 * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

#define BUILD_BUG_ON(condition)					\
	((void) sizeof(char[-!!(condition)]))

/**
 * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
 * @condition: the condition which should be false.
 *
 * If the condition is a constant and true, the compiler will generate a build
 * error. If the condition is not constant, a BUG will be triggered at runtime
 * if the condition is ever true. If the condition is constant and false, no
 * code is emitted.
 */
#define BUILD_RUNTIME_BUG_ON(condition)				\
	do {							\
		if (__builtin_constant_p(condition))		\
			BUILD_BUG_ON(condition);		\
		else						\
			BUG_ON(condition);			\
	} while (0)

#endif
Commit	Line	Data
44d13f19 MD	1	#ifndef _LTTNG_BUG_H
	2	#define _LTTNG_BUG_H
	3
	4	/*
	5	* lib/bug.h
	6	*
	7	* (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*
	9	* Dual LGPL v2.1/GPL v2 license.
	10	*/
	11
a6352fd4 MD	12	#define BUILD_BUG_ON(condition) \
	13	((void) sizeof(char[-!!(condition)]))
	14
44d13f19 MD	15	/**
	16	* BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
	17	* @condition: the condition which should be false.
	18	*
	19	* If the condition is a constant and true, the compiler will generate a build
	20	* error. If the condition is not constant, a BUG will be triggered at runtime
	21	* if the condition is ever true. If the condition is constant and false, no
	22	* code is emitted.
	23	*/
	24	#define BUILD_RUNTIME_BUG_ON(condition) \
	25	do { \
	26	if (__builtin_constant_p(condition)) \
	27	BUILD_BUG_ON(condition); \
	28	else \
	29	BUG_ON(condition); \
	30	} while (0)
	31
	32	#endif