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098dd79ee2
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>
101 lines
4.4 KiB
C
101 lines
4.4 KiB
C
/*
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* virprobe.h: dynamic operation tracing
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*
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* Copyright (C) 2006-2014 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __VIR_PROBE_H__
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# define __VIR_PROBE_H__
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# include "internal.h"
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# include "virlog.h"
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# if WITH_DTRACE_PROBES
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# ifndef LIBVIRT_PROBES_H
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# define LIBVIRT_PROBES_H
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# include "libvirt_probes.h"
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# endif /* LIBVIRT_PROBES_H */
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/* Systemtap 1.2 headers have a bug where they cannot handle a
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* variable declared with array type. Work around this by casting all
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* arguments. This is some gross use of the preprocessor because
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* PROBE is a var-arg macro, but it is better than the alternative of
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* making all callers to PROBE have to be aware of the issues. And
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* hopefully, if we ever add a call to PROBE with other than 9
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* end arguments, you can figure out the pattern to extend this hack.
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*/
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# define VIR_COUNT_ARGS(...) VIR_ARG11(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
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# define VIR_ARG11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, ...) _11
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# define VIR_ADD_CAST_EXPAND(a, b, ...) VIR_ADD_CAST_PASTE(a, b, __VA_ARGS__)
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# define VIR_ADD_CAST_PASTE(a, b, ...) a##b(__VA_ARGS__)
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/* The double cast is necessary to silence gcc warnings; any pointer
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* can safely go to intptr_t and back to void *, which collapses
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* arrays into pointers; while any integer can be widened to intptr_t
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* then cast to void *. */
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# define VIR_ADD_CAST(a) ((void *)(intptr_t)(a))
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# define VIR_ADD_CAST1(a) \
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VIR_ADD_CAST(a)
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# define VIR_ADD_CAST2(a, b) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b)
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# define VIR_ADD_CAST3(a, b, c) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c)
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# define VIR_ADD_CAST4(a, b, c, d) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d)
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# define VIR_ADD_CAST5(a, b, c, d, e) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e)
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# define VIR_ADD_CAST6(a, b, c, d, e, f) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f)
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# define VIR_ADD_CAST7(a, b, c, d, e, f, g) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g)
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# define VIR_ADD_CAST8(a, b, c, d, e, f, g, h) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g), VIR_ADD_CAST(h)
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# define VIR_ADD_CAST9(a, b, c, d, e, f, g, h, i) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g), VIR_ADD_CAST(h), VIR_ADD_CAST(i)
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# define VIR_ADD_CASTS(...) \
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VIR_ADD_CAST_EXPAND(VIR_ADD_CAST, VIR_COUNT_ARGS(__VA_ARGS__), \
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__VA_ARGS__)
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# define PROBE_EXPAND(NAME, ARGS) NAME(ARGS)
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# define PROBE(NAME, FMT, ...) \
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VIR_DEBUG_INT(&virLogSelf, \
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NULL, __LINE__, __func__, \
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#NAME ": " FMT, __VA_ARGS__); \
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if (LIBVIRT_ ## NAME ## _ENABLED()) { \
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PROBE_EXPAND(LIBVIRT_ ## NAME, \
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VIR_ADD_CASTS(__VA_ARGS__)); \
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}
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# else
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# define PROBE(NAME, FMT, ...) \
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VIR_DEBUG_INT(&virLogSelf, \
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NULL, __LINE__, __func__, \
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#NAME ": " FMT, __VA_ARGS__);
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# endif
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#endif /* __VIR_PROBE_H__ */
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