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
  57 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)  \
  58         DEFINE_TRACE(name)
  59
  60 #undef TRACE_EVENT_CONDITION
  61 #define TRACE_EVENT_CONDITION(name, proto, args, cond, tstruct, assign, print) \
  62         TRACE_EVENT(name,                                               \
  63                 PARAMS(proto),                                          \
  64                 PARAMS(args),                                           \
  65                 PARAMS(tstruct),                                        \
  66                 PARAMS(assign),                                         \
  67                 PARAMS(print))
  68
  69 #undef TRACE_EVENT_FN
  70 #define TRACE_EVENT_FN(name, proto, args, tstruct,              \
  71                 assign, print, reg, unreg)                      \
  72         DEFINE_TRACE_FN(name, reg, unreg)
  73
  74 #undef DEFINE_EVENT
  75 #define DEFINE_EVENT(template, name, proto, args) \
  76         DEFINE_TRACE(name)
  77
  78 #undef DEFINE_EVENT_PRINT
  79 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  80         DEFINE_TRACE(name)
  81
  82 #undef DEFINE_EVENT_CONDITION
  83 #define DEFINE_EVENT_CONDITION(template, name, proto, args, cond) \
  84         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  85
  86 #undef DECLARE_TRACE
  87 #define DECLARE_TRACE(name, proto, args)        \
  88         DEFINE_TRACE(name)
  89
  90 #undef TRACE_INCLUDE
  91 #undef __TRACE_INCLUDE
  92
  93 #ifndef TRACE_INCLUDE_FILE
  94 # define TRACE_INCLUDE_FILE TRACE_SYSTEM
  95 # define UNDEF_TRACE_INCLUDE_FILE
  96 #endif
  97
  98 #ifndef TRACE_INCLUDE_PATH
  99 # define __TRACE_INCLUDE(system) <trace/events/system.h>
 100 # define UNDEF_TRACE_INCLUDE_PATH
 101 #else
 102 # define __TRACE_INCLUDE(system) __stringify(TRACE_INCLUDE_PATH/system.h)
 103 #endif
 104
 105 # define TRACE_INCLUDE(system) __TRACE_INCLUDE(system)
 106
 107 /* Let the trace headers be reread */
 108 #define TRACE_HEADER_MULTI_READ
 109
 110 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 111
 112 /* Make all open coded DECLARE_TRACE nops */
 113 #undef DECLARE_TRACE
 114 #define DECLARE_TRACE(name, proto, args)
 115
 116 #ifdef LTTNG_PACKAGE_BUILD
 117 #include "lttng-events.h"
 118 #endif
 119
 120 #undef TRACE_EVENT
 121 #undef TRACE_EVENT_FN
 122 #undef TRACE_EVENT_CONDITION
 123 #undef DECLARE_EVENT_CLASS
 124 #undef DEFINE_EVENT
 125 #undef DEFINE_EVENT_PRINT
 126 #undef DEFINE_EVENT_CONDITION
 127 #undef TRACE_HEADER_MULTI_READ
 128 #undef DECLARE_TRACE
 129
 130 /* Only undef what we defined in this file */
 131 #ifdef UNDEF_TRACE_INCLUDE_FILE
 132 # undef TRACE_INCLUDE_FILE
 133 # undef UNDEF_TRACE_INCLUDE_FILE
 134 #endif
 135
 136 #ifdef UNDEF_TRACE_INCLUDE_PATH
 137 # undef TRACE_INCLUDE_PATH
 138 # undef UNDEF_TRACE_INCLUDE_PATH
 139 #endif
 140
 141 /* We may be processing more files */
 142 #define CREATE_TRACE_POINTS
 143
 144 #endif /* CREATE_TRACE_POINTS */