[fio.git] / compiler / compiler.h

#ifndef FIO_COMPILER_H
#define FIO_COMPILER_H

#if __GNUC__ >= 4
#include "compiler-gcc4.h"
#elif __GNUC__ == 3
#include "compiler-gcc3.h"
#else
#error Compiler too old, need gcc at least gcc 3.x
#endif

#ifndef __must_check
#define __must_check
#endif

/*
 * Mark unused variables passed to ops functions as unused, to silence gcc
 */
#define fio_unused	__attribute__((__unused__))
#define fio_init	__attribute__((constructor))
#define fio_exit	__attribute__((destructor))

#define fio_unlikely(x)	__builtin_expect(!!(x), 0)

/*
 * Check at compile time that something is of a particular type.
 * Always evaluates to 1 so you may use it easily in comparisons.
 */
#define typecheck(type,x) \
({	type __dummy; \
	typeof(x) __dummy2; \
	(void)(&__dummy == &__dummy2); \
	1; \
})

#endif
Commit	Line	Data
	1	#ifndef FIO_COMPILER_H
	2	#define FIO_COMPILER_H
	3
	4	#if __GNUC__ >= 4
	5	#include "compiler-gcc4.h"
	6	#elif __GNUC__ == 3
	7	#include "compiler-gcc3.h"
	8	#else
	9	#error Compiler too old, need gcc at least gcc 3.x
	10	#endif
	11
	12	#ifndef __must_check
	13	#define __must_check
	14	#endif
	15
	16	/*
	17	* Mark unused variables passed to ops functions as unused, to silence gcc
	18	*/
	19	#define fio_unused __attribute__((__unused__))
	20	#define fio_init __attribute__((constructor))
	21	#define fio_exit __attribute__((destructor))
	22
	23	#define fio_unlikely(x) __builtin_expect(!!(x), 0)
	24
	25	/*
	26	* Check at compile time that something is of a particular type.
	27	* Always evaluates to 1 so you may use it easily in comparisons.
	28	*/
	29	#define typecheck(type,x) \
	30	({ type __dummy; \
	31	typeof(x) __dummy2; \
	32	(void)(&__dummy == &__dummy2); \
	33	1; \
	34	})
	35
	36	#endif