include/ust/ust_trace.h

   1 /*
   2  * Copyright (C) 2009     Steven Rostedt <srostedt@redhat.com>
   3  * Copyright (C) 2010     Nils Carlson <nils.carlson@ericsson.com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  18  *
  19  */
  20
  21 /*
  22  * This whole file is currently a dummy, mapping a TRACE_EVENT
  23  * to a printf
  24  */
  25
  26 #include <stdio.h>
  27
  28 /*
  29  * Stage 1. Create a struct and a printf calling function
  30  * that is connected to the tracepoint at load time.
  31  */
  32 #undef TRACE_EVENT
  33 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)          \
  34         DECLARE_TRACE_EVENT_CLASS(name,                                 \
  35                                   TP_PARAMS(proto),                     \
  36                                   TP_PARAMS(args),                      \
  37                                   TP_PARAMS(tstruct),                   \
  38                                   TP_PARAMS(assign),                    \
  39                                   TP_PARAMS(print));                    \
  40         DEFINE_TRACE_EVENT(name, name, TP_PARAMS(proto), TP_PARAMS(args));
  41
  42 #undef __field
  43 #define __field(type, item)             type    item;
  44
  45 #undef TP_STRUCT__entry
  46 #define TP_STRUCT__entry(args...) args
  47
  48 #undef TP_printf
  49 #define TP_printf(fmt, args...) fmt "\n", args
  50
  51 #undef TP_fast_assign
  52 #define TP_fast_assign(args...) args
  53
  54 #undef DEFINE_TRACE_EVENT
  55 #define DEFINE_TRACE_EVENT(template, name, proto, args)
  56
  57
  58 #undef DECLARE_TRACE_EVENT_CLASS
  59 #define DECLARE_TRACE_EVENT_CLASS(name, proto, args, tstruct, assign, print)    \
  60         struct trace_raw_##name {                                       \
  61                 tstruct                                                 \
  62         };                                                              \
  63         static void trace_printf_##name(void *dummy, proto)             \
  64         {                                                               \
  65                 struct trace_raw_##name entry_struct, *__entry;         \
  66                 __entry = &entry_struct;                                \
  67                 { assign };                                     \
  68                                                                         \
  69                 printf(print);                                          \
  70         }                                                               \
  71         static inline int register_event_##name(void *data)             \
  72         {                                                               \
  73                 return register_tracepoint(name, trace_printf_##name, data); \
  74         }                                                               \
  75         static inline int unregister_event_##name(void *data)           \
  76         {                                                               \
  77                 return unregister_tracepoint(name, trace_printf_##name, data); \
  78         }                                                               \
  79         struct trace_event __event_##name = {                           \
  80                 __tpstrtab_##name,                                      \
  81                 register_event_##name,                                  \
  82                 unregister_event_##name                                 \
  83         };                                                              \
  84         static struct trace_event * const __event_ptrs_##name           \
  85         __attribute__((used, section("__trace_events_ptrs"))) =         \
  86                 &__event_##name;                                        \
  87                                                                         \
  88         static void __attribute__((constructor)) init_##name()          \
  89         {                                                               \
  90                 void *dummy = NULL;                                     \
  91                 register_tracepoint(name, trace_printf_##name, dummy);  \
  92         }
  93
  94
  95 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)