[mirror_spl-debian.git] / include / sys / debug.h

/*****************************************************************************\
 *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
 *  Copyright (C) 2007 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
 *  UCRL-CODE-235197
 *
 *  This file is part of the SPL, Solaris Porting Layer.
 *  For details, see <http://zfsonlinux.org/>.
 *
 *  The SPL is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  The SPL 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 the SPL.  If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/

/*
 * Available Solaris debug functions.  All of the ASSERT() macros will be
 * compiled out when NDEBUG is defined, this is the default behavior for
 * the SPL.  To enable assertions use the --enable-debug with configure.
 * The VERIFY() functions are never compiled out and cannot be disabled.
 *
 * PANIC()	- Panic the node and print message.
 * ASSERT()	- Assert X is true, if not panic.
 * ASSERTV()	- Wraps a variable declaration which is only used by ASSERT().
 * ASSERT3S()	- Assert signed X OP Y is true, if not panic.
 * ASSERT3U()	- Assert unsigned X OP Y is true, if not panic.
 * ASSERT3P()	- Assert pointer X OP Y is true, if not panic.
 * ASSERT0()	- Assert value is zero, if not panic.
 * VERIFY()	- Verify X is true, if not panic.
 * VERIFY3S()	- Verify signed X OP Y is true, if not panic.
 * VERIFY3U()	- Verify unsigned X OP Y is true, if not panic.
 * VERIFY3P()	- Verify pointer X OP Y is true, if not panic.
 * VERIFY0()	- Verify value is zero, if not panic.
 */

#ifndef _SPL_DEBUG_H
#define	_SPL_DEBUG_H

/*
 * Common DEBUG functionality.
 */
int spl_panic(const char *file, const char *func, int line,
    const char *fmt, ...);
void spl_dumpstack(void);

#define	PANIC(fmt, a...)						\
	spl_panic(__FILE__, __FUNCTION__, __LINE__, fmt, ## a)

#define	VERIFY(cond)							\
	(void)(unlikely(!(cond)) &&					\
	    spl_panic(__FILE__, __FUNCTION__, __LINE__,			\
	    "%s", "VERIFY(" #cond ") failed\n"))

#define	VERIFY3_IMPL(LEFT, OP, RIGHT, TYPE, FMT, CAST)			\
	(void)((!((TYPE)(LEFT) OP (TYPE)(RIGHT))) &&			\
	    spl_panic(__FILE__, __FUNCTION__, __LINE__,			\
	    "VERIFY3(" #LEFT " " #OP " " #RIGHT ") "			\
	    "failed (" FMT " " #OP " " FMT ")\n",			\
	    CAST (LEFT), CAST (RIGHT)))

#define	VERIFY3S(x,y,z)	VERIFY3_IMPL(x, y, z, int64_t, "%lld", (long long))
#define	VERIFY3U(x,y,z)	VERIFY3_IMPL(x, y, z, uint64_t, "%llu",		\
				    (unsigned long long))
#define	VERIFY3P(x,y,z)	VERIFY3_IMPL(x, y, z, uintptr_t, "%p", (void *))
#define	VERIFY0(x)	VERIFY3_IMPL(0, ==, x, int64_t, "%lld",	(long long))

#define	CTASSERT_GLOBAL(x)		_CTASSERT(x, __LINE__)
#define	CTASSERT(x)			{ _CTASSERT(x, __LINE__); }
#define	_CTASSERT(x, y)			__CTASSERT(x, y)
#define	__CTASSERT(x, y)						\
	typedef char __attribute__ ((unused))				\
	__compile_time_assertion__ ## y[(x) ? 1 : -1]

/*
 * Debugging disabled (--disable-debug)
 */
#ifdef NDEBUG

#define	SPL_DEBUG_STR		""
#define	ASSERT(x)		((void)0)
#define	ASSERTV(x)
#define	ASSERT3S(x,y,z)		((void)0)
#define	ASSERT3U(x,y,z)		((void)0)
#define	ASSERT3P(x,y,z)		((void)0)
#define	ASSERT0(x)		((void)0)
#define	IMPLY(A, B)		((void)0)
#define	EQUIV(A, B)		((void)0)

/*
 * Debugging enabled (--enable-debug)
 */
#else

#define	SPL_DEBUG_STR		" (DEBUG mode)"
#define	ASSERT(cond)		VERIFY(cond)
#define	ASSERTV(x)		x
#define	ASSERT3S(x,y,z)		VERIFY3S(x, y, z)
#define	ASSERT3U(x,y,z)		VERIFY3U(x, y, z)
#define	ASSERT3P(x,y,z)		VERIFY3P(x, y, z)
#define	ASSERT0(x)		VERIFY0(x)
#define	IMPLY(A, B) \
	((void)(((!(A)) || (B)) || \
	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
	    "(" #A ") implies (" #B ")")))
#define	EQUIV(A, B) \
	((void)((!!(A) == !!(B)) || \
	    spl_panic(__FILE__, __FUNCTION__, __LINE__, \
	    "(" #A ") is equivalent to (" #B ")")))

#endif /* NDEBUG */

#endif /* SPL_DEBUG_H */
Commit	Line	Data
716154c5 BB	1	/*****************************************************************************\
	2	* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
	3	* Copyright (C) 2007 The Regents of the University of California.
	4	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	5	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
715f6251	6	* UCRL-CODE-235197
715f6251	7	*
716154c5	8	* This file is part of the SPL, Solaris Porting Layer.
3d6af2dd	9	* For details, see <http://zfsonlinux.org/>.
716154c5 BB	10	*
	11	* The SPL is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
715f6251	15	*
716154c5	16	* The SPL is distributed in the hope that it will be useful, but WITHOUT
715f6251	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	19	* for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along
716154c5 BB	22	* with the SPL. If not, see <http://www.gnu.org/licenses/>.
716154c5 BB	23	\*****************************************************************************/
715f6251	24
55abb092 BB	25	/*
	26	* Available Solaris debug functions. All of the ASSERT() macros will be
	27	* compiled out when NDEBUG is defined, this is the default behavior for
	28	* the SPL. To enable assertions use the --enable-debug with configure.
	29	* The VERIFY() functions are never compiled out and cannot be disabled.
	30	*
	31	* PANIC() - Panic the node and print message.
	32	* ASSERT() - Assert X is true, if not panic.
55abb092 BB	33	* ASSERTV() - Wraps a variable declaration which is only used by ASSERT().
	34	* ASSERT3S() - Assert signed X OP Y is true, if not panic.
	35	* ASSERT3U() - Assert unsigned X OP Y is true, if not panic.
	36	* ASSERT3P() - Assert pointer X OP Y is true, if not panic.
80093b6f	37	* ASSERT0() - Assert value is zero, if not panic.
55abb092 BB	38	* VERIFY() - Verify X is true, if not panic.
	39	* VERIFY3S() - Verify signed X OP Y is true, if not panic.
	40	* VERIFY3U() - Verify unsigned X OP Y is true, if not panic.
	41	* VERIFY3P() - Verify pointer X OP Y is true, if not panic.
80093b6f	42	* VERIFY0() - Verify value is zero, if not panic.
55abb092 BB	43	*/
55abb092 BB	44
f4b37741	45	#ifndef _SPL_DEBUG_H
10946b02	46	#define _SPL_DEBUG_H
f4b37741	47
10946b02 AX	48	/*
	49	* Common DEBUG functionality.
	50	*/
	51	int spl_panic(const char file, const char func, int line,
	52	const char *fmt, ...);
	53	void spl_dumpstack(void);
57d1b188	54
10946b02 AX	55	#define PANIC(fmt, a...) \
10946b02 AX	56	spl_panic(__FILE__, __FUNCTION__, __LINE__, fmt, ## a)
57d1b188	57
10946b02	58	#define VERIFY(cond) \
9e4fb5c2	59	(void)(unlikely(!(cond)) && \
10946b02 AX	60	spl_panic(__FILE__, __FUNCTION__, __LINE__, \
10946b02 AX	61	"%s", "VERIFY(" #cond ") failed\n"))
57d1b188	62
10946b02	63	#define VERIFY3_IMPL(LEFT, OP, RIGHT, TYPE, FMT, CAST) \
9e4fb5c2	64	(void)((!((TYPE)(LEFT) OP (TYPE)(RIGHT))) && \
10946b02 AX	65	spl_panic(__FILE__, __FUNCTION__, __LINE__, \
	66	"VERIFY3(" #LEFT " " #OP " " #RIGHT ") " \
	67	"failed (" FMT " " #OP " " FMT ")\n", \
	68	CAST (LEFT), CAST (RIGHT)))
57d1b188	69
10946b02 AX	70	#define VERIFY3S(x,y,z) VERIFY3_IMPL(x, y, z, int64_t, "%lld", (long long))
10946b02 AX	71	#define VERIFY3U(x,y,z) VERIFY3_IMPL(x, y, z, uint64_t, "%llu", \
55abb092	72	(unsigned long long))
10946b02 AX	73	#define VERIFY3P(x,y,z) VERIFY3_IMPL(x, y, z, uintptr_t, "%p", (void *))
10946b02 AX	74	#define VERIFY0(x) VERIFY3_IMPL(0, ==, x, int64_t, "%lld", (long long))
57d1b188	75
10946b02 AX	76	#define CTASSERT_GLOBAL(x) _CTASSERT(x, __LINE__)
	77	#define CTASSERT(x) { _CTASSERT(x, __LINE__); }
	78	#define _CTASSERT(x, y) __CTASSERT(x, y)
	79	#define __CTASSERT(x, y) \
	80	typedef char __attribute__ ((unused)) \
	81	__compile_time_assertion__ ## y[(x) ? 1 : -1]
9e4fb5c2 LG	82
9e4fb5c2 LG	83	/*
10946b02	84	* Debugging disabled (--disable-debug)
9e4fb5c2	85	*/
10946b02 AX	86	#ifdef NDEBUG
	87
	88	#define SPL_DEBUG_STR ""
	89	#define ASSERT(x) ((void)0)
	90	#define ASSERTV(x)
	91	#define ASSERT3S(x,y,z) ((void)0)
	92	#define ASSERT3U(x,y,z) ((void)0)
	93	#define ASSERT3P(x,y,z) ((void)0)
	94	#define ASSERT0(x) ((void)0)
f6188ddd AX	95	#define IMPLY(A, B) ((void)0)
f6188ddd AX	96	#define EQUIV(A, B) ((void)0)
9e4fb5c2 LG	97
9e4fb5c2 LG	98	/*
10946b02	99	* Debugging enabled (--enable-debug)
9e4fb5c2	100	*/
10946b02 AX	101	#else
	102
	103	#define SPL_DEBUG_STR " (DEBUG mode)"
	104	#define ASSERT(cond) VERIFY(cond)
	105	#define ASSERTV(x) x
	106	#define ASSERT3S(x,y,z) VERIFY3S(x, y, z)
	107	#define ASSERT3U(x,y,z) VERIFY3U(x, y, z)
	108	#define ASSERT3P(x,y,z) VERIFY3P(x, y, z)
	109	#define ASSERT0(x) VERIFY0(x)
f6188ddd AX	110	#define IMPLY(A, B) \
	111	((void)(((!(A)) \|\| (B)) \|\| \
	112	spl_panic(__FILE__, __FUNCTION__, __LINE__, \
	113	"(" #A ") implies (" #B ")")))
	114	#define EQUIV(A, B) \
	115	((void)((!!(A) == !!(B)) \|\| \
	116	spl_panic(__FILE__, __FUNCTION__, __LINE__, \
	117	"(" #A ") is equivalent to (" #B ")")))
10946b02 AX	118
10946b02 AX	119	#endif /* NDEBUG */
9e4fb5c2	120
f4b37741	121	#endif /* SPL_DEBUG_H */