probes/define_trace.h

   1 /*
   2  * define_trace.h
   3  *
   4  * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
   5  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; only
  10  * version 2.1 of the License.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /*
  23  * Trace files that want to automate creationg of all tracepoints defined
  24  * in their file should include this file. The following are macros that the
  25  * trace file may define:
  26  *
  27  * TRACE_SYSTEM defines the system the tracepoint is for
  28  *
  29  * TRACE_INCLUDE_FILE if the file name is something other than TRACE_SYSTEM.h
  30  *     This macro may be defined to tell define_trace.h what file to include.
  31  *     Note, leave off the ".h".
  32  *
  33  * TRACE_INCLUDE_PATH if the path is something other than core kernel include/trace
  34  *     then this macro can define the path to use. Note, the path is relative to
  35  *     define_trace.h, not the file including it. Full path names for out of tree
  36  *     modules must be used.
  37  */
  38
  39 #ifdef CREATE_TRACE_POINTS
  40
  41 /* Prevent recursion */
  42 #undef CREATE_TRACE_POINTS
  43
  44 #include <linux/stringify.h>
  45 /*
  46  * module.h includes tracepoints, and because ftrace.h
  47  * pulls in module.h:
  48  *  trace/ftrace.h -> linux/ftrace_event.h -> linux/perf_event.h ->
  49  *  linux/ftrace.h -> linux/module.h
  50  * we must include module.h here before we play with any of
  51  * the TRACE_EVENT() macros, otherwise the tracepoints included
  52  * by module.h may break the build.
  53  */
  54 #include <linux/module.h>
  55
  56 #undef TRACE_EVENT_MAP
  57 #define TRACE_EVENT_MAP(name, map, proto, args, tstruct, assign, print)
  58
  59 #undef TRACE_EVENT_CONDITION_MAP
  60 #define TRACE_EVENT_CONDITION_MAP(name, map, proto, args, cond, tstruct, assign, print) \
  61         TRACE_EVENT(name,                                               \
  62                 PARAMS(proto),                                          \
  63                 PARAMS(args),                                           \
  64                 PARAMS(tstruct),                                        \
  65                 PARAMS(assign),                                         \
  66                 PARAMS(print))
  67
  68 #undef TRACE_EVENT_FN_MAP
  69 #define TRACE_EVENT_FN_MAP(name, map, proto, args, tstruct,             \
  70                 assign, print, reg, unreg)
  71
  72 #undef DEFINE_EVENT_MAP
  73 #define DEFINE_EVENT_MAP(template, name, map, proto, args)
  74
  75 #undef DEFINE_EVENT_PRINT_MAP
  76 #define DEFINE_EVENT_PRINT_MAP(template, name, map, proto, args, print)
  77
  78 #undef DEFINE_EVENT_CONDITION_MAP
  79 #define DEFINE_EVENT_CONDITION_MAP(template, name, map, proto, args, cond) \
  80         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  81
  82
  83 #undef TRACE_EVENT
  84 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)
  85
  86 #undef TRACE_EVENT_CONDITION
  87 #define TRACE_EVENT_CONDITION(name, proto, args, cond, tstruct, assign, print) \
  88         TRACE_EVENT(name,                                               \
  89                 PARAMS(proto),                                          \
  90                 PARAMS(args),                                           \
  91                 PARAMS(tstruct),                                        \
  92                 PARAMS(assign),                                         \
  93                 PARAMS(print))
  94
  95 #undef TRACE_EVENT_FN
  96 #define TRACE_EVENT_FN(name, proto, args, tstruct,              \
  97                 assign, print, reg, unreg)
  98
  99 #undef DEFINE_EVENT
 100 #define DEFINE_EVENT(template, name, proto, args)
 101
 102 #undef DEFINE_EVENT_PRINT
 103 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 104
 105 #undef DEFINE_EVENT_CONDITION
 106 #define DEFINE_EVENT_CONDITION(template, name, proto, args, cond) \
 107         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 108
 109 #undef DECLARE_TRACE
 110 #define DECLARE_TRACE(name, proto, args)
 111
 112 #undef TRACE_INCLUDE
 113 #undef __TRACE_INCLUDE
 114
 115 #ifndef TRACE_INCLUDE_FILE
 116 # define TRACE_INCLUDE_FILE TRACE_SYSTEM
 117 # define UNDEF_TRACE_INCLUDE_FILE
 118 #endif
 119
 120 #ifndef TRACE_INCLUDE_PATH
 121 # define __TRACE_INCLUDE(system) <trace/events/system.h>
 122 # define UNDEF_TRACE_INCLUDE_PATH
 123 #else
 124 # define __TRACE_INCLUDE(system) __stringify(TRACE_INCLUDE_PATH/system.h)
 125 #endif
 126
 127 # define TRACE_INCLUDE(system) __TRACE_INCLUDE(system)
 128
 129 /* Let the trace headers be reread */
 130 #define TRACE_HEADER_MULTI_READ
 131
 132 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 133
 134 /* Make all open coded DECLARE_TRACE nops */
 135 #undef DECLARE_TRACE
 136 #define DECLARE_TRACE(name, proto, args)
 137
 138 #ifdef LTTNG_PACKAGE_BUILD
 139 #include "lttng-events.h"
 140 #endif
 141
 142 #undef TRACE_EVENT
 143 #undef TRACE_EVENT_FN
 144 #undef TRACE_EVENT_CONDITION
 145 #undef DEFINE_EVENT
 146 #undef DEFINE_EVENT_PRINT
 147 #undef DEFINE_EVENT_CONDITION
 148 #undef TRACE_EVENT_MAP
 149 #undef TRACE_EVENT_FN_MAP
 150 #undef TRACE_EVENT_CONDITION_MAP
 151 #undef DECLARE_EVENT_CLASS
 152 #undef DEFINE_EVENT_MAP
 153 #undef DEFINE_EVENT_PRINT_MAP
 154 #undef DEFINE_EVENT_CONDITION_MAP
 155 #undef TRACE_HEADER_MULTI_READ
 156
 157 /* Only undef what we defined in this file */
 158 #ifdef UNDEF_TRACE_INCLUDE_FILE
 159 # undef TRACE_INCLUDE_FILE
 160 # undef UNDEF_TRACE_INCLUDE_FILE
 161 #endif
 162
 163 #ifdef UNDEF_TRACE_INCLUDE_PATH
 164 # undef TRACE_INCLUDE_PATH
 165 # undef UNDEF_TRACE_INCLUDE_PATH
 166 #endif
 167
 168 /* We may be processing more files */
 169 #define CREATE_TRACE_POINTS
 170
 171 #endif /* CREATE_TRACE_POINTS */