extra/barectf-tracepoint.h

   1 #ifndef _BARECTF_TRACEPOINT_H
   2 #define _BARECTF_TRACEPOINT_H
   3
   4 /*
   5  * The MIT License (MIT)
   6  *
   7  * Copyright (c) 2016-2020 Philippe Proulx <pproulx@efficios.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * a copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  24  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  25  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  26  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 /* Get identifier prefix */
  31 #ifdef BARECTF_TRACEPOINT_PREFIX
  32 # define _BARECTF_TRACEPOINT_PREFIX BARECTF_TRACEPOINT_PREFIX
  33 #else
  34 # ifdef _BARECTF_IDENTIFIER_PREFIX
  35 #  define _BARECTF_TRACEPOINT_PREFIX _BARECTF_IDENTIFIER_PREFIX
  36 # else
  37 #  error You must define `BARECTF_TRACEPOINT_PREFIX` to use this header.
  38 # endif
  39 #endif
  40
  41 /* Get data stream type name to use */
  42 #ifdef BARECTF_TRACEPOINT_STREAM
  43 # define _BARECTF_TRACEPOINT_DST_NAME BARECTF_TRACEPOINT_STREAM
  44 #elif defined(BARECTF_TRACEPOINT_DATA_STREAM_TYPE_NAME)
  45 # define _BARECTF_TRACEPOINT_DST_NAME BARECTF_TRACEPOINT_DATA_STREAM_TYPE_NAME
  46 #else
  47 # ifdef _BARECTF_DEFAULT_DATA_STREAM_TYPE_NAME
  48 #  define _BARECTF_TRACEPOINT_DST_NAME _BARECTF_DEFAULT_DATA_STREAM_TYPE_NAME
  49 # else
  50 #  error You must define `BARECTF_TRACEPOINT_DATA_STREAM_TYPE_NAME` to use this header.
  51 # endif
  52 #endif
  53
  54 /* Get context to use */
  55 #ifndef BARECTF_TRACEPOINT_CTX
  56 # error You must define `BARECTF_TRACEPOINT_CTX` to use this header.
  57 #endif
  58
  59 /*
  60  * Combines 6 token. Inspired by __TP_COMBINE_TOKENS4() in
  61  * <lttng/tracepoint.h>. See sections 6.10.3 and 6.10.3.1 of
  62  * ISO/IEC 9899:1999.
  63  */
  64 #define __COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f) \
  65         _a ## _b ## _c ## _d ## _e ## _f
  66 #define _COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f) \
  67         __COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f)
  68
  69 /* tracepoint() used by the user */
  70 #undef tracepoint
  71 #define tracepoint(_prov_name, _tp_name, ...) \
  72         _COMBINE_TOKENS6(_BARECTF_TRACEPOINT_PREFIX, _BARECTF_TRACEPOINT_DST_NAME, _trace_, _prov_name, _, _tp_name)(BARECTF_TRACEPOINT_CTX, ##__VA_ARGS__)
  73
  74 #endif /* _BARECTF_TRACEPOINT_H */