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Fix: support -std=c99 in tracepoint macros
[lttng-ust.git] / include / lttng / tracepoint.h
CommitLineData
b728d87e
MD		 1#ifndef _LTTNG_TRACEPOINT_H
2#define _LTTNG_TRACEPOINT_H
3
4/*
e92f3e28 5 * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
b728d87e 6 *
e92f3e28
MD		 7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
b728d87e 13 *
e92f3e28
MD		 14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
b728d87e
MD		 16 */
17
8fce9e2b 18#include <lttng/tracepoint-types.h>
40b2b5a4 19#include <lttng/tracepoint-rcu.h>
b728d87e 20#include <urcu/compiler.h>
deb6e540 21#include <dlfcn.h> /* for dlopen */
51920067 22#include <string.h> /* for memset */
40b2b5a4 23#include <assert.h>
b2f60c79
MD		 24#include <lttng/ust-config.h> /* for sdt */
25
26#ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
27#define SDT_USE_VARIADIC
28#include <sys/sdt.h>
29#else
30#define STAP_PROBEV(...)
31#endif
b728d87e
MD		 32
33#ifdef __cplusplus
34extern "C" {
35#endif
36
23c8854a
MD		 37#define tracepoint(provider, name, ...) \
38 do { \
7cb85a18 39 STAP_PROBEV(provider, name, ## __VA_ARGS__); \
23c8854a
MD		 40 if (caa_unlikely(__tracepoint_##provider##___##name.state)) \
41 __tracepoint_cb_##provider##___##name(__VA_ARGS__); \
b728d87e
MD		 42 } while (0)
43
44#define TP_ARGS(...) __VA_ARGS__
45
46/*
47 * TP_ARGS takes tuples of type, argument separated by a comma.
48 * It can take up to 10 tuples (which means that less than 10 tuples is
49 * fine too).
50 * Each tuple is also separated by a comma.
51 */
df854e41
MD		 52#define __TP_COMBINE_TOKENS(_tokena, _tokenb) \
53 _tokena##_tokenb
54#define _TP_COMBINE_TOKENS(_tokena, _tokenb) \
55 __TP_COMBINE_TOKENS(_tokena, _tokenb)
56#define __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
57 _tokena##_tokenb##_tokenc
58#define _TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
59 __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc)
60#define __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
61 _tokena##_tokenb##_tokenc##_tokend
62#define _TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
63 __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend)
b728d87e 64
68571fb5
MD		 65/*
66 * _TP_EXVAR* extract the var names.
67 * _TP_EXVAR1 and _TP_EXDATA_VAR1 are needed for -std=c99.
68 */
b728d87e 69#define _TP_EXVAR0()
68571fb5 70#define _TP_EXVAR1(a)
b728d87e
MD		 71#define _TP_EXVAR2(a,b) b
72#define _TP_EXVAR4(a,b,c,d) b,d
73#define _TP_EXVAR6(a,b,c,d,e,f) b,d,f
74#define _TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h
75#define _TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j
76#define _TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l
77#define _TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n
78#define _TP_EXVAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) b,d,f,h,j,l,n,p
79#define _TP_EXVAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) b,d,f,h,j,l,n,p,r
80#define _TP_EXVAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) b,d,f,h,j,l,n,p,r,t
81
82#define _TP_EXDATA_VAR0() __tp_data
68571fb5 83#define _TP_EXDATA_VAR1(a) __tp_data
b728d87e
MD		 84#define _TP_EXDATA_VAR2(a,b) __tp_data,b
85#define _TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d
86#define _TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f
87#define _TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h
88#define _TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j
89#define _TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l
90#define _TP_EXDATA_VAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) __tp_data,b,d,f,h,j,l,n
91#define _TP_EXDATA_VAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) __tp_data,b,d,f,h,j,l,n,p
92#define _TP_EXDATA_VAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) __tp_data,b,d,f,h,j,l,n,p,r
93#define _TP_EXDATA_VAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) __tp_data,b,d,f,h,j,l,n,p,r,t
94
68571fb5
MD		 95/*
96 * _TP_EXPROTO* extract tuples of type, var.
97 * _TP_EXPROTO1 and _TP_EXDATA_PROTO1 are needed for -std=c99.
98 */
2541580a 99#define _TP_EXPROTO0() void
68571fb5 100#define _TP_EXPROTO1(a) void
b728d87e
MD		 101#define _TP_EXPROTO2(a,b) a b
102#define _TP_EXPROTO4(a,b,c,d) a b,c d
103#define _TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f
104#define _TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h
105#define _TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j
106#define _TP_EXPROTO12(a,b,c,d,e,f,g,h,i,j,k,l) a b,c d,e f,g h,i j,k l
107#define _TP_EXPROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) a b,c d,e f,g h,i j,k l,m n
108#define _TP_EXPROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) a b,c d,e f,g h,i j,k l,m n,o p
109#define _TP_EXPROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) a b,c d,e f,g h,i j,k l,m n,o p,q r
110#define _TP_EXPROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) a b,c d,e f,g h,i j,k l,m n,o p,q r,s t
111
112#define _TP_EXDATA_PROTO0() void *__tp_data
68571fb5 113#define _TP_EXDATA_PROTO1(a) void *__tp_data
b728d87e
MD		 114#define _TP_EXDATA_PROTO2(a,b) void *__tp_data,a b
115#define _TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d
116#define _TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f
117#define _TP_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h
118#define _TP_EXDATA_PROTO10(a,b,c,d,e,f,g,h,i,j) void *__tp_data,a b,c d,e f,g h,i j
119#define _TP_EXDATA_PROTO12(a,b,c,d,e,f,g,h,i,j,k,l) void *__tp_data,a b,c d,e f,g h,i j,k l
120#define _TP_EXDATA_PROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) void *__tp_data,a b,c d,e f,g h,i j,k l,m n
121#define _TP_EXDATA_PROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p
122#define _TP_EXDATA_PROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r
123#define _TP_EXDATA_PROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r,s t
124
125/* Preprocessor trick to count arguments. Inspired from sdt.h. */
126#define _TP_NARGS(...) __TP_NARGS(__VA_ARGS__, 20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
127#define __TP_NARGS(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, N, ...) N
23c8854a
MD		 128#define _TP_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXPROTO, N)(__VA_ARGS__))
129#define _TP_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXVAR, N)(__VA_ARGS__))
130#define _TP_DATA_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_PROTO, N)(__VA_ARGS__))
131#define _TP_DATA_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_VAR, N)(__VA_ARGS__))
b728d87e 132#define _TP_ARGS_PROTO(...) _TP_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
23c8854a 133#define _TP_ARGS_VAR(...) _TP_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
b728d87e 134#define _TP_ARGS_DATA_PROTO(...) _TP_DATA_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
23c8854a 135#define _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
b728d87e
MD		 136#define _TP_PARAMS(...) __VA_ARGS__
137
0f2f7e21
MD		 138#define _DECLARE_TRACEPOINT(_provider, _name, ...) \
139extern struct tracepoint __tracepoint_##_provider##___##_name; \
140static inline void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \
b728d87e
MD		 141{ \
142 struct tracepoint_probe *__tp_probe; \
143 \
40b2b5a4 144 if (!TP_RCU_LINK_TEST()) \
deb6e540 145 return; \
40b2b5a4 146 tp_rcu_read_lock_bp(); \
0f2f7e21 147 __tp_probe = tp_rcu_dereference_bp(__tracepoint_##_provider##___##_name.probes); \
23c8854a 148 if (caa_unlikely(!__tp_probe)) \
b728d87e
MD		 149 goto end; \
150 do { \
23c8854a
MD		 151 void *__tp_cb = __tp_probe->func; \
152 void *__tp_data = __tp_probe->data; \
b728d87e 153 \
23c8854a
MD		 154 URCU_FORCE_CAST(void (*)(_TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \
155 (_TP_ARGS_DATA_VAR(__VA_ARGS__)); \
156 } while ((++__tp_probe)->func); \
b728d87e 157end: \
40b2b5a4 158 tp_rcu_read_unlock_bp(); \
b728d87e 159} \
0f2f7e21 160static inline void __tracepoint_register_##_provider##___##_name(char *name, \
23c8854a 161 void *func, void *data) \
b728d87e 162{ \
67e5f391
MD		 163 __tracepoint_probe_register(name, func, data, \
164 __tracepoint_##_provider##___##_name.signature); \
b728d87e 165} \
0f2f7e21 166static inline void __tracepoint_unregister_##_provider##___##_name(char *name, \
23c8854a 167 void *func, void *data) \
b728d87e 168{ \
23c8854a 169 __tracepoint_probe_unregister(name, func, data); \
b728d87e
MD		 170}
171
67e5f391
MD		 172extern int __tracepoint_probe_register(const char *name, void *func, void *data,
173 const char *signature);
deb6e540
MD		 174extern int __tracepoint_probe_unregister(const char *name, void *func, void *data);
175
51920067
MD		 176/*
177 * tracepoint dynamic linkage handling (callbacks). Hidden visibility:
178 * shared across objects in a module/main executable.
179 */
180struct tracepoint_dlopen {
181 void *liblttngust_handle;
182
183 int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start,
184 int tracepoints_count);
185 int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start);
186#ifndef _LGPL_SOURCE
187 void (*rcu_read_lock_sym_bp)(void);
188 void (*rcu_read_unlock_sym_bp)(void);
189 void *(*rcu_dereference_sym_bp)(void *p);
190#endif
191};
192
193extern struct tracepoint_dlopen tracepoint_dlopen;
194
deb6e540
MD		 195#ifdef TRACEPOINT_DEFINE
196
628e1d81
MD		 197/*
198 * When TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a
199 * unresolved symbol that requires the provider to be linked in. When
200 * TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an
201 * unresolved symbol that depends on having the provider linked in,
202 * otherwise the linker complains. This deals with use of static
203 * libraries, ensuring that the linker does not remove the provider
204 * object from the executable.
205 */
206#ifdef TRACEPOINT_PROBE_DYNAMIC_LINKAGE
b4f3bc52 207#define _TRACEPOINT_UNDEFINED_REF(provider) NULL
628e1d81 208#else /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
b4f3bc52 209#define _TRACEPOINT_UNDEFINED_REF(provider) &__tracepoint_provider_##provider
628e1d81
MD		 210#endif /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
211
b728d87e
MD		 212/*
213 * Note: to allow PIC code, we need to allow the linker to update the pointers
214 * in the __tracepoints_ptrs section.
215 * Therefore, this section is _not_ const (read-only).
216 */
b4f3bc52
MD		 217#define _TP_EXTRACT_STRING(...) #__VA_ARGS__
218
219#define _DEFINE_TRACEPOINT(_provider, _name, _args) \
220 extern int __tracepoint_provider_##_provider; \
221 static const char __tp_strtab_##_provider##___##_name[] \
b728d87e 222 __attribute__((section("__tracepoints_strings"))) = \
b4f3bc52
MD		 223 #_provider ":" #_name; \
224 struct tracepoint __tracepoint_##_provider##___##_name \
b728d87e 225 __attribute__((section("__tracepoints"))) = \
b4f3bc52
MD		 226 { \
227 __tp_strtab_##_provider##___##_name, \
228 0, \
229 NULL, \
230 _TRACEPOINT_UNDEFINED_REF(_provider), \
231 _TP_EXTRACT_STRING(_args), \
232 }; \
233 static struct tracepoint * __tracepoint_ptr_##_provider##___##_name \
b728d87e 234 __attribute__((used, section("__tracepoints_ptrs"))) = \
b4f3bc52 235 &__tracepoint_##_provider##___##_name;
b728d87e 236
b728d87e
MD		 237/*
238 * These weak symbols, the constructor, and destructor take care of
239 * registering only _one_ instance of the tracepoints per shared-ojbect
240 * (or for the whole main program).
241 */
242extern struct tracepoint * const __start___tracepoints_ptrs[]
243 __attribute__((weak, visibility("hidden")));
244extern struct tracepoint * const __stop___tracepoints_ptrs[]
245 __attribute__((weak, visibility("hidden")));
246int __tracepoint_registered
247 __attribute__((weak, visibility("hidden")));
51920067
MD		 248struct tracepoint_dlopen tracepoint_dlopen
249 __attribute__((weak, visibility("hidden")));
b728d87e
MD		 250
251static void __attribute__((constructor)) __tracepoints__init(void)
252{
253 if (__tracepoint_registered++)
254 return;
deb6e540 255
51920067
MD		 256 tracepoint_dlopen.liblttngust_handle =
257 dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL);
258 if (!tracepoint_dlopen.liblttngust_handle)
deb6e540 259 return;
51920067 260 tracepoint_dlopen.tracepoint_register_lib =
93ffe366 261 URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int),
51920067 262 dlsym(tracepoint_dlopen.liblttngust_handle,
93ffe366 263 "tracepoint_register_lib"));
51920067 264 tracepoint_dlopen.tracepoint_unregister_lib =
93ffe366 265 URCU_FORCE_CAST(int (*)(struct tracepoint * const *),
51920067 266 dlsym(tracepoint_dlopen.liblttngust_handle,
93ffe366 267 "tracepoint_unregister_lib"));
40b2b5a4 268#ifndef _LGPL_SOURCE
51920067 269 tracepoint_dlopen.rcu_read_lock_sym_bp =
40b2b5a4 270 URCU_FORCE_CAST(void (*)(void),
51920067 271 dlsym(tracepoint_dlopen.liblttngust_handle,
40b2b5a4 272 "tp_rcu_read_lock_bp"));
51920067 273 tracepoint_dlopen.rcu_read_unlock_sym_bp =
40b2b5a4 274 URCU_FORCE_CAST(void (*)(void),
51920067 275 dlsym(tracepoint_dlopen.liblttngust_handle,
40b2b5a4 276 "tp_rcu_read_unlock_bp"));
51920067 277 tracepoint_dlopen.rcu_dereference_sym_bp =
40b2b5a4 278 URCU_FORCE_CAST(void *(*)(void *p),
51920067 279 dlsym(tracepoint_dlopen.liblttngust_handle,
40b2b5a4
MD		 280 "tp_rcu_dereference_sym_bp"));
281#endif
51920067 282 tracepoint_dlopen.tracepoint_register_lib(__start___tracepoints_ptrs,
b728d87e
MD		 283 __stop___tracepoints_ptrs -
284 __start___tracepoints_ptrs);
285}
286
287static void __attribute__((destructor)) __tracepoints__destroy(void)
288{
deb6e540 289 int ret;
51920067 290
b728d87e
MD		 291 if (--__tracepoint_registered)
292 return;
51920067
MD		 293 if (tracepoint_dlopen.tracepoint_unregister_lib)
294 tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs);
295 if (tracepoint_dlopen.liblttngust_handle) {
296 ret = dlclose(tracepoint_dlopen.liblttngust_handle);
deb6e540 297 assert(!ret);
51920067 298 memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen));
deb6e540 299 }
b728d87e
MD		 300}
301
deb6e540
MD		 302#else /* TRACEPOINT_DEFINE */
303
b4f3bc52 304#define _DEFINE_TRACEPOINT(_provider, _name, _args)
deb6e540
MD		 305
306#endif /* #else TRACEPOINT_DEFINE */
307
b728d87e
MD		 308#ifdef __cplusplus
309}
310#endif
311
312#endif /* _LTTNG_TRACEPOINT_H */
313
314/* The following declarations must be outside re-inclusion protection. */
315
316#ifndef TRACEPOINT_EVENT
317
318/*
319 * How to use the TRACEPOINT_EVENT macro:
320 *
321 * An example:
322 *
323 * TRACEPOINT_EVENT(someproject_component, event_name,
324 *
325 * * TP_ARGS takes from 0 to 10 "type, field_name" pairs *
326 *
327 * TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen,
328 * long *, arg4, size_t, arg4_len),
329 *
330 * * TP_FIELDS describes the event payload layout in the trace *
331 *
332 * TP_FIELDS(
333 * * Integer, printed in base 10 *
334 * ctf_integer(int, field_a, arg0)
335 *
336 * * Integer, printed with 0x base 16 *
337 * ctf_integer_hex(unsigned long, field_d, arg1)
338 *
339 * * Array Sequence, printed as UTF8-encoded array of bytes *
340 * ctf_array_text(char, field_b, string, FIXED_LEN)
341 * ctf_sequence_text(char, field_c, string, size_t, strlen)
342 *
343 * * String, printed as UTF8-encoded string *
344 * ctf_string(field_e, string)
345 *
346 * * Array sequence of signed integer values *
347 * ctf_array(long, field_f, arg4, FIXED_LEN4)
348 * ctf_sequence(long, field_g, arg4, size_t, arg4_len)
349 * )
350 * )
351 *
352 * More detailed explanation:
353 *
354 * The name of the tracepoint is expressed as a tuple with the provider
355 * and name arguments.
356 *
357 * The provider and name should be a proper C99 identifier.
358 * The "provider" and "name" MUST follow these rules to ensure no
359 * namespace clash occurs:
360 *
361 * For projects (applications and libraries) for which an entity
362 * specific to the project controls the source code and thus its
363 * tracepoints (typically with a scope larger than a single company):
364 *
365 * either:
366 * project_component, event
367 * or:
368 * project, event
369 *
370 * Where "project" is the name of the project,
371 * "component" is the name of the project component (which may
372 * include several levels of sub-components, e.g.
373 * ...component_subcomponent_...) where the tracepoint is located
374 * (optional),
375 * "event" is the name of the tracepoint event.
376 *
377 * For projects issued from a single company wishing to advertise that
378 * the company controls the source code and thus the tracepoints, the
379 * "com_" prefix should be used:
380 *
381 * either:
382 * com_company_project_component, event
383 * or:
384 * com_company_project, event
385 *
386 * Where "company" is the name of the company,
387 * "project" is the name of the project,
388 * "component" is the name of the project component (which may
389 * include several levels of sub-components, e.g.
390 * ...component_subcomponent_...) where the tracepoint is located
391 * (optional),
392 * "event" is the name of the tracepoint event.
393 *
394 * the provider:event identifier is limited to 127 characters.
395 */
396
b728d87e 397#define TRACEPOINT_EVENT(provider, name, args, fields) \
deb6e540 398 _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
b4f3bc52 399 _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args))
b728d87e
MD		 400
401#define TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
402
403#define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \
deb6e540 404 _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
b4f3bc52 405 _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args))
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407#endif /* #ifndef TRACEPOINT_EVENT */
408
409#ifndef TRACEPOINT_LOGLEVEL
410
411/*
75c5ad79 412 * Tracepoint Loglevels
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MD		 413 *
414 * Typical use of these loglevels:
415 *
d8de1354 416 * The loglevels go from 0 to 14. Higher numbers imply the most
75c5ad79
MD		 417 * verbosity (higher event throughput expected.
418 *
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MD		 419 * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels
420 * semantic. Loglevels 7 through 13 offer more fine-grained selection of
421 * debug information.
75c5ad79 422 *
d8de1354 423 * TRACE_EMERG 0
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MD		 424 * system is unusable
425 *
d8de1354 426 * TRACE_ALERT 1
75c5ad79
MD		 427 * action must be taken immediately
428 *
d8de1354 429 * TRACE_CRIT 2
75c5ad79
MD		 430 * critical conditions
431 *
d8de1354 432 * TRACE_ERR 3
75c5ad79
MD		 433 * error conditions
434 *
d8de1354 435 * TRACE_WARNING 4
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MD		 436 * warning conditions
437 *
d8de1354 438 * TRACE_NOTICE 5
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MD		 439 * normal, but significant, condition
440 *
d8de1354 441 * TRACE_INFO 6
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MD		 442 * informational message
443 *
d8de1354
MD		 444 * TRACE_DEBUG_SYSTEM 7
445 * debug information with system-level scope (set of programs)
75c5ad79 446 *
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MD		 447 * TRACE_DEBUG_PROGRAM 8
448 * debug information with program-level scope (set of processes)
75c5ad79 449 *
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MD		 450 * TRACE_DEBUG_PROCESS 9
451 * debug information with process-level scope (set of modules)
75c5ad79 452 *
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MD		 453 * TRACE_DEBUG_MODULE 10
454 * debug information with module (executable/library) scope (set of units)
75c5ad79 455 *
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MD		 456 * TRACE_DEBUG_UNIT 11
457 * debug information with compilation unit scope (set of functions)
75c5ad79 458 *
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MD		 459 * TRACE_DEBUG_FUNCTION 12
460 * debug information with function-level scope
75c5ad79 461 *
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MD		 462 * TRACE_DEBUG_LINE 13
463 * debug information with line-level scope (TRACEPOINT_EVENT default)
902e1379 464 *
d8de1354 465 * TRACE_DEBUG 14
902e1379 466 * debug-level message (trace_printf default)
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MD		 467 *
468 * Declare tracepoint loglevels for tracepoints. A TRACEPOINT_EVENT
469 * should be declared prior to the the TRACEPOINT_LOGLEVEL for a given
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MD		 470 * tracepoint name. The first field is the provider name, the second
471 * field is the name of the tracepoint, the third field is the loglevel
472 * name.
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474 * TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >,
475 * < loglevel_name >)
476 *
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MD		 477 * The TRACEPOINT_PROVIDER must be already declared before declaring a
478 * TRACEPOINT_LOGLEVEL.
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MD		 479 */
480
882a56d7 481enum {
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MD		 482 TRACE_EMERG = 0,
483 TRACE_ALERT = 1,
484 TRACE_CRIT = 2,
485 TRACE_ERR = 3,
486 TRACE_WARNING = 4,
487 TRACE_NOTICE = 5,
488 TRACE_INFO = 6,
489 TRACE_DEBUG_SYSTEM = 7,
490 TRACE_DEBUG_PROGRAM = 8,
491 TRACE_DEBUG_PROCESS = 9,
492 TRACE_DEBUG_MODULE = 10,
493 TRACE_DEBUG_UNIT = 11,
494 TRACE_DEBUG_FUNCTION = 12,
495 TRACE_DEBUG_LINE = 13,
496 TRACE_DEBUG = 14,
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MD		 497};
498
05ceaafd 499#define TRACEPOINT_LOGLEVEL(provider, name, loglevel)
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501#endif /* #ifndef TRACEPOINT_LOGLEVEL */
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