libvirt/src/util/virprobe.h
Daniel P. Berrange 098dd79ee2 Turn virLogSource into a struct instead of an enum
As part of the goal to get away from doing string matching on
filenames when deciding whether to emit a log message, turn
the virLogSource enum into a struct which contains a log
"name". There will eventually be one virLogSource instance
statically declared per source file. To minimise churn in this
commit though, a single global instance is used.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2014-03-18 14:29:22 +00:00

101 lines
4.4 KiB
C

/*
* virprobe.h: dynamic operation tracing
*
* Copyright (C) 2006-2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#ifndef __VIR_PROBE_H__
# define __VIR_PROBE_H__
# include "internal.h"
# include "virlog.h"
# if WITH_DTRACE_PROBES
# ifndef LIBVIRT_PROBES_H
# define LIBVIRT_PROBES_H
# include "libvirt_probes.h"
# endif /* LIBVIRT_PROBES_H */
/* Systemtap 1.2 headers have a bug where they cannot handle a
* variable declared with array type. Work around this by casting all
* arguments. This is some gross use of the preprocessor because
* PROBE is a var-arg macro, but it is better than the alternative of
* making all callers to PROBE have to be aware of the issues. And
* hopefully, if we ever add a call to PROBE with other than 9
* end arguments, you can figure out the pattern to extend this hack.
*/
# define VIR_COUNT_ARGS(...) VIR_ARG11(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
# define VIR_ARG11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, ...) _11
# define VIR_ADD_CAST_EXPAND(a, b, ...) VIR_ADD_CAST_PASTE(a, b, __VA_ARGS__)
# define VIR_ADD_CAST_PASTE(a, b, ...) a##b(__VA_ARGS__)
/* The double cast is necessary to silence gcc warnings; any pointer
* can safely go to intptr_t and back to void *, which collapses
* arrays into pointers; while any integer can be widened to intptr_t
* then cast to void *. */
# define VIR_ADD_CAST(a) ((void *)(intptr_t)(a))
# define VIR_ADD_CAST1(a) \
VIR_ADD_CAST(a)
# define VIR_ADD_CAST2(a, b) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b)
# define VIR_ADD_CAST3(a, b, c) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c)
# define VIR_ADD_CAST4(a, b, c, d) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
VIR_ADD_CAST(d)
# define VIR_ADD_CAST5(a, b, c, d, e) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
VIR_ADD_CAST(d), VIR_ADD_CAST(e)
# define VIR_ADD_CAST6(a, b, c, d, e, f) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f)
# define VIR_ADD_CAST7(a, b, c, d, e, f, g) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
VIR_ADD_CAST(g)
# define VIR_ADD_CAST8(a, b, c, d, e, f, g, h) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
VIR_ADD_CAST(g), VIR_ADD_CAST(h)
# define VIR_ADD_CAST9(a, b, c, d, e, f, g, h, i) \
VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
VIR_ADD_CAST(g), VIR_ADD_CAST(h), VIR_ADD_CAST(i)
# define VIR_ADD_CASTS(...) \
VIR_ADD_CAST_EXPAND(VIR_ADD_CAST, VIR_COUNT_ARGS(__VA_ARGS__), \
__VA_ARGS__)
# define PROBE_EXPAND(NAME, ARGS) NAME(ARGS)
# define PROBE(NAME, FMT, ...) \
VIR_DEBUG_INT(&virLogSelf, \
NULL, __LINE__, __func__, \
#NAME ": " FMT, __VA_ARGS__); \
if (LIBVIRT_ ## NAME ## _ENABLED()) { \
PROBE_EXPAND(LIBVIRT_ ## NAME, \
VIR_ADD_CASTS(__VA_ARGS__)); \
}
# else
# define PROBE(NAME, FMT, ...) \
VIR_DEBUG_INT(&virLogSelf, \
NULL, __LINE__, __func__, \
#NAME ": " FMT, __VA_ARGS__);
# endif
#endif /* __VIR_PROBE_H__ */