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Add extra/barectf-tracepoint.h (tracepoint() macro wrapper)

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
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eepp committed Apr 7, 2016
1 parent f31f13a commit d183b2df67b35464a41273ed9cd1f2d45c661a59
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  1. +70 −0 extra/barectf-tracepoint.h
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#ifndef _BARECTF_TRACEPOINT_H
#define _BARECTF_TRACEPOINT_H
/*
* The MIT License (MIT)
*
* Copyright (c) 2016 Philippe Proulx <pproulx@efficios.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* get prefix */
#ifdef BARECTF_TRACEPOINT_PREFIX
# define _BARECTF_TRACEPOINT_PREFIX BARECTF_TRACEPOINT_PREFIX
#else
# ifdef _BARECTF_PREFIX
# define _BARECTF_TRACEPOINT_PREFIX _BARECTF_PREFIX
# else
# error You need to define BARECTF_TRACEPOINT_PREFIX in order to use this header.
# endif
#endif
/* get stream name to use */
#ifdef BARECTF_TRACEPOINT_STREAM
# define _BARECTF_TRACEPOINT_STREAM BARECTF_TRACEPOINT_STREAM
#else
# ifdef _BARECTF_DEFAULT_STREAM
# define _BARECTF_TRACEPOINT_STREAM _BARECTF_DEFAULT_STREAM
# else
# error You need to define BARECTF_TRACEPOINT_STREAM in order to use this header.
# endif
#endif
/* get context to use */
#ifndef BARECTF_TRACEPOINT_CTX
# error You need to define BARECTF_TRACEPOINT_CTX in order to use this header.
#endif
/*
* Combines 6 token. Inspired by __TP_COMBINE_TOKENS4() in
* <lttng/tracepoint.h>. See sections 6.10.3 and 6.10.3.1 of
* ISO/IEC 9899:1999.
*/
#define __COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f) \
_a ## _b ## _c ## _d ## _e ## _f
#define _COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f) \
__COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f)
/* tracepoint() used by the user */
#undef tracepoint
#define tracepoint(_prov_name, _tp_name, ...) \
_COMBINE_TOKENS6(_BARECTF_TRACEPOINT_PREFIX, _BARECTF_TRACEPOINT_STREAM, _trace_, _prov_name, _, _tp_name)(BARECTF_TRACEPOINT_CTX, ##__VA_ARGS__)
#endif /* _BARECTF_TRACEPOINT_H */

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