[lttv.git] / lttv / lttv / compiler.h

/* This file is part of the Linux Trace Toolkit trace reading library
 * Copyright (C) 2003-2004 Mathieu Desnoyers
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
 * MA 02110-1301, USA
 */

#ifndef COMPILER_H
#define COMPILER_H

/* Fast prediction if likely branches */
#define likely(x) __builtin_expect(!!(x), 1)
#define 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; \
})

/* Deal with 32 wrap correctly */
#define guint32_after(a,b) \
  (typecheck(guint32, a) && \
   typecheck(guint32, b) && \
   ((gint32)(b) - (gint32)(a) < 0))
#define guint32_before(a,b)  guint32_after(b,a)

#define guint32_after_eq(a,b) \
  (typecheck(guint32, a) && \
   typecheck(guint32, b) && \
   ((gint32)(b) - (gint32)(a) <= 0))
#define guint32_before_eq(a,b)  guint32_after_eq(b,a)

#define __EXPORT __attribute__ ((visibility ("default")))

#ifndef max
#define max(a,b) ((a)>(b)?(a):(b))
#endif

#ifndef min
#define min(a,b) ((a)<(b)?(a):(b))
#endif

#endif //COMPILER_H
Commit	Line	Data
7a4bdb54 YB	1	/* This file is part of the Linux Trace Toolkit trace reading library
	2	* Copyright (C) 2003-2004 Mathieu Desnoyers
	3	*
adc007f3 YB	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License Version 2 as
	6	* published by the Free Software Foundation;
7a4bdb54	7	*
adc007f3	8	* This program is distributed in the hope that it will be useful,
7a4bdb54	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
adc007f3 YB	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
adc007f3 YB	11	* GNU General Public License for more details.
7a4bdb54	12	*
adc007f3 YB	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	16	* MA 02110-1301, USA
7a4bdb54 YB	17	*/
	18
	19	#ifndef COMPILER_H
	20	#define COMPILER_H
	21
	22	/* Fast prediction if likely branches */
	23	#define likely(x) __builtin_expect(!!(x), 1)
	24	#define unlikely(x) __builtin_expect(!!(x), 0)
	25
	26
	27	/*
	28	* Check at compile time that something is of a particular type.
	29	* Always evaluates to 1 so you may use it easily in comparisons.
	30	*/
	31	#define typecheck(type,x) \
	32	({ type __dummy; \
	33	typeof(x) __dummy2; \
	34	(void)(&__dummy == &__dummy2); \
	35	1; \
	36	})
	37
	38	/* Deal with 32 wrap correctly */
	39	#define guint32_after(a,b) \
	40	(typecheck(guint32, a) && \
	41	typecheck(guint32, b) && \
	42	((gint32)(b) - (gint32)(a) < 0))
	43	#define guint32_before(a,b) guint32_after(b,a)
	44
	45	#define guint32_after_eq(a,b) \
	46	(typecheck(guint32, a) && \
	47	typecheck(guint32, b) && \
	48	((gint32)(b) - (gint32)(a) <= 0))
	49	#define guint32_before_eq(a,b) guint32_after_eq(b,a)
	50
	51	#define __EXPORT __attribute__ ((visibility ("default")))
	52
	53	#ifndef max
	54	#define max(a,b) ((a)>(b)?(a):(b))
	55	#endif
	56
	57	#ifndef min
	58	#define min(a,b) ((a)<(b)?(a):(b))
	59	#endif
	60
	61	#endif //COMPILER_H