projects / lttng-ust.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Fix: static_assert unavailable with glibc < 2.16
[lttng-ust.git] / include / lttng / tracepoint.h
CommitLineData
b728d87e 1/*
c0c0989a 2 * SPDX-License-Identifier: MIT
b728d87e 3 *
c0c0989a 4 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
b728d87e
MD		 5 */
6
9b14815a
MD		 7#ifndef _LTTNG_UST_TRACEPOINT_H
8#define _LTTNG_UST_TRACEPOINT_H
c0c0989a 9
76aca78d
MD		 10#include <stdio.h>
11#include <stdlib.h>
8fce9e2b 12#include <lttng/tracepoint-types.h>
40b2b5a4 13#include <lttng/tracepoint-rcu.h>
b728d87e 14#include <urcu/compiler.h>
c082d14b 15#include <urcu/system.h>
deb6e540 16#include <dlfcn.h> /* for dlopen */
51920067 17#include <string.h> /* for memset */
3d3dc207 18
b2f60c79 19#include <lttng/ust-config.h> /* for sdt */
a8909ba5 20#include <lttng/ust-compiler.h>
3d3dc207 21#include <lttng/ust-tracer.h>
cbc06a3b 22#include <lttng/ust-api-compat.h>
b2f60c79 23
81b16412
MD		 24#define LTTNG_UST_TRACEPOINT_NAME_LEN_MAX 256
25
b2f60c79 26#ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
23b75ae5
MJ		 27/*
28 * Instead of using SDT_USE_VARIADIC from 'sys/sdt.h', use our own namespaced
29 * macros since the instrumented application might already have included
30 * 'sys/sdt.h' without variadic support.
31 */
b2f60c79 32#include <sys/sdt.h>
23b75ae5 33
bd75d5b9
MJ		 34#define LTTNG_UST__SDT_NARG(...) \
35 LTTNG_UST___SDT_NARG(__VA_ARGS__, 12,11,10,9,8,7,6,5,4,3,2,1,0)
23b75ae5 36
bd75d5b9 37#define LTTNG_UST___SDT_NARG(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12, N, ...) N
23b75ae5 38
bd75d5b9 39#define LTTNG_UST__SDT_PROBE_N(provider, name, N, ...) \
23b75ae5
MJ		 40 _SDT_PROBE(provider, name, N, (__VA_ARGS__))
41
b88f9167 42#define LTTNG_UST_STAP_PROBEV(provider, name, ...) \
bd75d5b9 43 LTTNG_UST__SDT_PROBE_N(provider, name, LTTNG_UST__SDT_NARG(0, ##__VA_ARGS__), ##__VA_ARGS__)
23b75ae5 44
b2f60c79 45#else
b88f9167 46#define LTTNG_UST_STAP_PROBEV(...)
b2f60c79 47#endif
b728d87e
MD		 48
49#ifdef __cplusplus
50extern "C" {
51#endif
52
cbc06a3b 53#define lttng_ust_tracepoint_enabled(provider, name) \
0274f7f2 54 caa_unlikely(CMM_LOAD_SHARED(lttng_ust_tracepoint_##provider##___##name.state))
8da6d0c8 55
cbc06a3b 56#define lttng_ust_do_tracepoint(provider, name, ...) \
0274f7f2 57 lttng_ust_tracepoint_cb_##provider##___##name(__VA_ARGS__)
8da6d0c8 58
cbc06a3b
MD		 59#define lttng_ust_tracepoint(provider, name, ...) \
60 do { \
61 LTTNG_UST_STAP_PROBEV(provider, name, ## __VA_ARGS__); \
62 if (lttng_ust_tracepoint_enabled(provider, name)) \
63 lttng_ust_do_tracepoint(provider, name, __VA_ARGS__); \
b728d87e
MD		 64 } while (0)
65
cadfcbfc 66#define LTTNG_UST_TP_ARGS(...) __VA_ARGS__
b728d87e
MD		 67
68/*
cadfcbfc 69 * LTTNG_UST_TP_ARGS takes tuples of type, argument separated by a comma.
b728d87e
MD		 70 * It can take up to 10 tuples (which means that less than 10 tuples is
71 * fine too).
72 * Each tuple is also separated by a comma.
73 */
aec5037b 74#define LTTNG_UST___TP_COMBINE_TOKENS(_tokena, _tokenb) \
df854e41 75 _tokena##_tokenb
aec5037b
MJ		 76#define LTTNG_UST__TP_COMBINE_TOKENS(_tokena, _tokenb) \
77 LTTNG_UST___TP_COMBINE_TOKENS(_tokena, _tokenb)
78#define LTTNG_UST___TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
df854e41 79 _tokena##_tokenb##_tokenc
aec5037b
MJ		 80#define LTTNG_UST__TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
81 LTTNG_UST___TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc)
82#define LTTNG_UST___TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
df854e41 83 _tokena##_tokenb##_tokenc##_tokend
aec5037b
MJ		 84#define LTTNG_UST__TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
85 LTTNG_UST___TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend)
b728d87e 86
4495dd39 87/*
20bbaf92 88 * LTTNG_UST__TP_EXVAR* extract the var names.
26772f59 89 * LTTNG_UST__TP_EXVAR1 and LTTNG_UST__TP_EXDATA_VAR1 are needed for -std=c99.
4495dd39 90 */
20bbaf92
MJ		 91#define LTTNG_UST__TP_EXVAR0()
92#define LTTNG_UST__TP_EXVAR1(a)
93#define LTTNG_UST__TP_EXVAR2(a,b) b
94#define LTTNG_UST__TP_EXVAR4(a,b,c,d) b,d
95#define LTTNG_UST__TP_EXVAR6(a,b,c,d,e,f) b,d,f
96#define LTTNG_UST__TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h
97#define LTTNG_UST__TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j
98#define LTTNG_UST__TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l
99#define LTTNG_UST__TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n
100#define LTTNG_UST__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
101#define LTTNG_UST__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
102#define LTTNG_UST__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
b728d87e 103
26772f59
MJ		 104#define LTTNG_UST__TP_EXDATA_VAR0() __tp_data
105#define LTTNG_UST__TP_EXDATA_VAR1(a) __tp_data
106#define LTTNG_UST__TP_EXDATA_VAR2(a,b) __tp_data,b
107#define LTTNG_UST__TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d
108#define LTTNG_UST__TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f
109#define LTTNG_UST__TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h
110#define LTTNG_UST__TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j
111#define LTTNG_UST__TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l
112#define LTTNG_UST__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
113#define LTTNG_UST__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
114#define LTTNG_UST__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
115#define LTTNG_UST__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
b728d87e 116
4495dd39 117/*
0efe0fcd
MJ		 118 * LTTNG_UST__TP_EXPROTO* extract tuples of type, var.
119 * LTTNG_UST__TP_EXPROTO1 and LTTNG_UST__TP_EXDATA_PROTO1 are needed for -std=c99.
4495dd39 120 */
0efe0fcd
MJ		 121#define LTTNG_UST__TP_EXPROTO0() void
122#define LTTNG_UST__TP_EXPROTO1(a) void
123#define LTTNG_UST__TP_EXPROTO2(a,b) a b
124#define LTTNG_UST__TP_EXPROTO4(a,b,c,d) a b,c d
125#define LTTNG_UST__TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f
126#define LTTNG_UST__TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h
127#define LTTNG_UST__TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j
128#define LTTNG_UST__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
129#define LTTNG_UST__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
130#define LTTNG_UST__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
131#define LTTNG_UST__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
132#define LTTNG_UST__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
b728d87e 133
26772f59
MJ		 134#define LTTNG_UST__TP_EXDATA_PROTO0() void *__tp_data
135#define LTTNG_UST__TP_EXDATA_PROTO1(a) void *__tp_data
136#define LTTNG_UST__TP_EXDATA_PROTO2(a,b) void *__tp_data,a b
137#define LTTNG_UST__TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d
138#define LTTNG_UST__TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f
139#define LTTNG_UST__TP_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h
140#define LTTNG_UST__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
141#define LTTNG_UST__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
142#define LTTNG_UST__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
143#define LTTNG_UST__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
144#define LTTNG_UST__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
145#define LTTNG_UST__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
b728d87e
MD		 146
147/* Preprocessor trick to count arguments. Inspired from sdt.h. */
6eddcb06
MJ		 148#define LTTNG_UST__TP_NARGS(...) LTTNG_UST___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)
149#define LTTNG_UST___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
150#define LTTNG_UST__TP_PROTO_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXPROTO, N)(__VA_ARGS__))
151#define LTTNG_UST__TP_VAR_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXVAR, N)(__VA_ARGS__))
152#define LTTNG_UST__TP_DATA_PROTO_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXDATA_PROTO, N)(__VA_ARGS__))
153#define LTTNG_UST__TP_DATA_VAR_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXDATA_VAR, N)(__VA_ARGS__))
154#define LTTNG_UST__TP_ARGS_PROTO(...) LTTNG_UST__TP_PROTO_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
155#define LTTNG_UST__TP_ARGS_VAR(...) LTTNG_UST__TP_VAR_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
156#define LTTNG_UST__TP_ARGS_DATA_PROTO(...) LTTNG_UST__TP_DATA_PROTO_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
157#define LTTNG_UST__TP_ARGS_DATA_VAR(...) LTTNG_UST__TP_DATA_VAR_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
158#define LTTNG_UST__TP_PARAMS(...) __VA_ARGS__
b728d87e 159
81b16412
MD		 160/*
161 * sizeof(#_provider) - 1 : length of the provider string (excluding \0).
162 * sizeof(#_name) - 1 : length of the name string (excluding \0).
163 * + 1 : separator between provider and event name.
164 *
165 * Upper bound (inclusive) is LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1 to
166 * account for \0.
167 *
168 * The comparison is:
169 * left hand side: sizeof(#_provider) - 1 + sizeof(#_name) - 1 + 1
170 * right hand side: LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1
171 * operator: <= (inclusive)
172 * Simplified in the code below.
173 */
174#define lttng_ust_tracepoint_validate_name_len(_provider, _name) \
175 lttng_ust_static_assert(sizeof(#_provider) + sizeof(#_name) <= LTTNG_UST_TRACEPOINT_NAME_LEN_MAX, \
176 "Tracepoint name length is too long", \
177 Tracepoint_name_length_is_too_long)
178
96f85541
MD		 179/*
180 * The tracepoint cb is marked always inline so we can distinguish
181 * between caller's ip addresses within the probe using the return
182 * address.
183 */
7f2f82c3 184#define LTTNG_UST__DECLARE_TRACEPOINT(_provider, _name, ...) \
29d6f421
MD		 185extern struct lttng_ust_tracepoint lttng_ust_tracepoint_##_provider##___##_name \
186 LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY; \
8da9deee 187static inline \
6eddcb06 188void lttng_ust_tracepoint_cb_##_provider##___##_name(LTTNG_UST__TP_ARGS_PROTO(__VA_ARGS__)) \
8da9deee 189 __attribute__((always_inline, unused)) lttng_ust_notrace; \
96f85541 190static \
6eddcb06 191void lttng_ust_tracepoint_cb_##_provider##___##_name(LTTNG_UST__TP_ARGS_PROTO(__VA_ARGS__)) \
b728d87e 192{ \
10544ee8 193 struct lttng_ust_tracepoint_probe *__tp_probe; \
b728d87e 194 \
251c9f75 195 if (caa_unlikely(!LTTNG_UST_TP_RCU_LINK_TEST())) \
deb6e540 196 return; \
251c9f75
MJ		 197 lttng_ust_tp_rcu_read_lock(); \
198 __tp_probe = lttng_ust_tp_rcu_dereference(lttng_ust_tracepoint_##_provider##___##_name.probes); \
23c8854a 199 if (caa_unlikely(!__tp_probe)) \
b728d87e
MD		 200 goto end; \
201 do { \
1a206094 202 void (*__tp_cb)(void) = __tp_probe->func; \
23c8854a 203 void *__tp_data = __tp_probe->data; \
b728d87e 204 \
6eddcb06
MJ		 205 URCU_FORCE_CAST(void (*)(LTTNG_UST__TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \
206 (LTTNG_UST__TP_ARGS_DATA_VAR(__VA_ARGS__)); \
23c8854a 207 } while ((++__tp_probe)->func); \
b728d87e 208end: \
251c9f75 209 lttng_ust_tp_rcu_read_unlock(); \
b728d87e 210} \
106ff4da 211static inline \
0274f7f2 212void lttng_ust_tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
106ff4da
MJ		 213 void (*func)(void), void *data) \
214 lttng_ust_notrace; \
a8909ba5 215static inline \
0274f7f2 216void lttng_ust_tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
a8909ba5 217 void (*func)(void), void *data) \
b728d87e 218{ \
9b34a2b2 219 lttng_ust_tracepoint_provider_register(provider_name, event_name, func, data, \
0274f7f2 220 lttng_ust_tracepoint_##_provider##___##_name.signature); \
b728d87e 221} \
106ff4da 222static inline \
0274f7f2 223void lttng_ust_tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
106ff4da
MJ		 224 void (*func)(void), void *data) \
225 lttng_ust_notrace; \
a8909ba5 226static inline \
0274f7f2 227void lttng_ust_tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
a8909ba5 228 void (*func)(void), void *data) \
b728d87e 229{ \
9b34a2b2 230 lttng_ust_tracepoint_provider_unregister(provider_name, event_name, func, data); \
b728d87e
MD		 231}
232
8812e921
MD		 233/*
234 * Registration of tracepoint provider probe functions with
235 * lttng_ust_tracepoint_provider_register, unregistration with
236 * lttng_ust_tracepoint_provider_unregister.
237 */
238int lttng_ust_tracepoint_provider_register(const char *provider_name, const char *event_name,
34f7f142 239 void (*func)(void), void *data, const char *signature);
8812e921 240int lttng_ust_tracepoint_provider_unregister(const char *provider_name, const char *event_name,
34f7f142 241 void (*func)(void), void *data);
deb6e540 242
8812e921
MD		 243/*
244 * Registration of tracepoint instrumentation modules with lttng_ust_tracepoint_module_register,
245 * unregistration with lttng_ust_tracepoint_module_unregister.
246 */
247int lttng_ust_tracepoint_module_register(struct lttng_ust_tracepoint * const *tracepoints_start,
248 int tracepoints_count);
249int lttng_ust_tracepoint_module_unregister(struct lttng_ust_tracepoint * const *tracepoints_start);
250
51920067
MD		 251/*
252 * tracepoint dynamic linkage handling (callbacks). Hidden visibility:
253 * shared across objects in a module/main executable.
f641d544
MD		 254 *
255 * IMPORTANT: this structure is part of the ABI between instrumented
256 * applications and UST. Fields need to be only added at the end, never
257 * reordered, never removed.
258 *
259 * The field @struct_size should be used to determine the size of the
260 * structure. It should be queried before using additional fields added
261 * at the end of the structure.
51920067 262 */
1a206094 263struct lttng_ust_tracepoint_dlopen {
f641d544
MD		 264 uint32_t struct_size;
265
51920067
MD		 266 void *liblttngust_handle;
267
14227bde 268 int (*lttng_ust_tracepoint_module_register)(struct lttng_ust_tracepoint * const *tracepoints_start,
51920067 269 int tracepoints_count);
14227bde 270 int (*lttng_ust_tracepoint_module_unregister)(struct lttng_ust_tracepoint * const *tracepoints_start);
10544ee8
MD		 271 void (*rcu_read_lock_sym)(void);
272 void (*rcu_read_unlock_sym)(void);
273 void *(*rcu_dereference_sym)(void *p);
f641d544
MD		 274
275 /* End of base ABI. Fields below should be used after checking struct_size. */
51920067
MD		 276};
277
7863d51a
MJ		 278extern struct lttng_ust_tracepoint_dlopen lttng_ust_tracepoint_dlopen;
279extern struct lttng_ust_tracepoint_dlopen *lttng_ust_tracepoint_dlopen_ptr;
51920067 280
46c881a7
MD		 281/*
282 * These weak symbols, the constructor, and destructor take care of
283 * registering only _one_ instance of the tracepoints per shared-ojbect
284 * (or for the whole main program).
285 */
0274f7f2 286int lttng_ust_tracepoint_registered
46c881a7 287 __attribute__((weak, visibility("hidden")));
0274f7f2 288int lttng_ust_tracepoint_ptrs_registered
46c881a7 289 __attribute__((weak, visibility("hidden")));
7863d51a 290struct lttng_ust_tracepoint_dlopen lttng_ust_tracepoint_dlopen
f641d544
MD		 291 __attribute__((weak, visibility("hidden"))) = {
292 .struct_size = sizeof(struct lttng_ust_tracepoint_dlopen),
293};
9443a022
MD		 294/*
295 * Deal with gcc O1 optimisation issues with weak hidden symbols. gcc
296 * 4.8 and prior does not have the same behavior for symbol scoping on
297 * 32-bit powerpc depending on the object size: symbols for objects of 8
298 * bytes or less have the same address throughout a module, whereas they
299 * have different addresses between compile units for objects larger
300 * than 8 bytes. Add this pointer indirection to ensure that the symbol
301 * scoping match that of the other weak hidden symbols found in this
302 * header.
303 */
7863d51a 304struct lttng_ust_tracepoint_dlopen *lttng_ust_tracepoint_dlopen_ptr
9443a022 305 __attribute__((weak, visibility("hidden")));
46c881a7 306
0fd0de10
FD		 307/*
308 * Tracepoint dynamic linkage handling (callbacks). Hidden visibility: shared
309 * across objects in a module/main executable. The callbacks are used to
310 * control and check if the destructors should be executed.
f641d544
MD		 311 *
312 * IMPORTANT: this structure is part of the ABI between instrumented
313 * applications and UST. Fields need to be only added at the end, never
314 * reordered, never removed.
315 *
316 * The field @struct_size should be used to determine the size of the
317 * structure. It should be queried before using additional fields added
318 * at the end of the structure.
0fd0de10
FD		 319 */
320struct lttng_ust_tracepoint_destructors_syms {
f641d544
MD		 321 uint32_t struct_size;
322
0fd0de10
FD		 323 void (*tracepoint_disable_destructors)(void);
324 int (*tracepoint_get_destructors_state)(void);
f641d544
MD		 325
326 /* End of base ABI. Fields below should be used after checking struct_size. */
0fd0de10
FD		 327};
328
62eb90f3
MJ		 329extern struct lttng_ust_tracepoint_destructors_syms lttng_ust_tracepoint_destructors_syms;
330extern struct lttng_ust_tracepoint_destructors_syms *lttng_ust_tracepoint_destructors_syms_ptr;
0fd0de10 331
62eb90f3 332struct lttng_ust_tracepoint_destructors_syms lttng_ust_tracepoint_destructors_syms
f641d544
MD		 333 __attribute__((weak, visibility("hidden"))) = {
334 .struct_size = sizeof(struct lttng_ust_tracepoint_destructors_syms),
335};
62eb90f3 336struct lttng_ust_tracepoint_destructors_syms *lttng_ust_tracepoint_destructors_syms_ptr
0fd0de10
FD		 337 __attribute__((weak, visibility("hidden")));
338
339static inline void tracepoint_disable_destructors(void)
340{
7863d51a
MJ		 341 if (!lttng_ust_tracepoint_dlopen_ptr)
342 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
62eb90f3
MJ		 343 if (!lttng_ust_tracepoint_destructors_syms_ptr)
344 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
7863d51a 345 if (lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle
62eb90f3
MJ		 346 && lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors)
347 lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors();
0fd0de10
FD		 348}
349
99234da6 350#ifndef _LGPL_SOURCE
106ff4da 351static inline void
0274f7f2 352lttng_ust_tracepoint__init_urcu_sym(void)
106ff4da 353 lttng_ust_notrace;
99234da6 354static inline void
0274f7f2 355lttng_ust_tracepoint__init_urcu_sym(void)
99234da6 356{
7863d51a
MJ		 357 if (!lttng_ust_tracepoint_dlopen_ptr)
358 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
99234da6
MD		 359 /*
360 * Symbols below are needed by tracepoint call sites and probe
361 * providers.
362 */
7863d51a
MJ		 363 if (!lttng_ust_tracepoint_dlopen_ptr->rcu_read_lock_sym)
364 lttng_ust_tracepoint_dlopen_ptr->rcu_read_lock_sym =
99234da6 365 URCU_FORCE_CAST(void (*)(void),
7863d51a 366 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
251c9f75 367 "lttng_ust_tp_rcu_read_lock"));
7863d51a
MJ		 368 if (!lttng_ust_tracepoint_dlopen_ptr->rcu_read_unlock_sym)
369 lttng_ust_tracepoint_dlopen_ptr->rcu_read_unlock_sym =
99234da6 370 URCU_FORCE_CAST(void (*)(void),
7863d51a 371 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
251c9f75 372 "lttng_ust_tp_rcu_read_unlock"));
7863d51a
MJ		 373 if (!lttng_ust_tracepoint_dlopen_ptr->rcu_dereference_sym)
374 lttng_ust_tracepoint_dlopen_ptr->rcu_dereference_sym =
99234da6 375 URCU_FORCE_CAST(void *(*)(void *p),
7863d51a 376 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
251c9f75 377 "lttng_ust_tp_rcu_dereference_sym"));
99234da6
MD		 378}
379#else
106ff4da 380static inline void
0274f7f2 381lttng_ust_tracepoint__init_urcu_sym(void)
106ff4da 382 lttng_ust_notrace;
99234da6 383static inline void
0274f7f2 384lttng_ust_tracepoint__init_urcu_sym(void)
99234da6
MD		 385{
386}
387#endif
388
465a0d04 389static void
ac9f44c2 390lttng_ust__tracepoints__init(void)
465a0d04 391 lttng_ust_notrace __attribute__((constructor));
46c881a7 392static void
ac9f44c2 393lttng_ust__tracepoints__init(void)
46c881a7 394{
0274f7f2 395 if (lttng_ust_tracepoint_registered++) {
7863d51a 396 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
8f0d1c78 397 return;
0274f7f2 398 lttng_ust_tracepoint__init_urcu_sym();
46c881a7 399 return;
8f0d1c78 400 }
46c881a7 401
7863d51a
MJ		 402 if (!lttng_ust_tracepoint_dlopen_ptr)
403 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
404 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
405 lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle =
3d3dc207 406 dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
7863d51a 407 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
46c881a7 408 return;
0274f7f2 409 lttng_ust_tracepoint__init_urcu_sym();
46c881a7
MD		 410}
411
c589eca2 412static void
ac9f44c2 413lttng_ust__tracepoints__destroy(void)
c589eca2 414 lttng_ust_notrace __attribute__((destructor));
46c881a7 415static void
ac9f44c2 416lttng_ust__tracepoints__destroy(void)
46c881a7
MD		 417{
418 int ret;
419
0274f7f2 420 if (--lttng_ust_tracepoint_registered)
46c881a7 421 return;
7863d51a
MJ		 422 if (!lttng_ust_tracepoint_dlopen_ptr)
423 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
62eb90f3
MJ		 424 if (!lttng_ust_tracepoint_destructors_syms_ptr)
425 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
7863d51a 426 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
0fd0de10 427 return;
0274f7f2 428 if (lttng_ust_tracepoint_ptrs_registered)
0fd0de10
FD		 429 return;
430 /*
431 * Lookup if destructors must be executed using the new method.
432 */
62eb90f3
MJ		 433 if (lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
434 && !lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()) {
0fd0de10
FD		 435 /*
436 * The tracepoint_get_destructors_state symbol was found with
437 * dlsym but its returned value is 0 meaning that destructors
438 * must not be executed.
439 */
440 return;
441 }
7863d51a 442 ret = dlclose(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle);
0fd0de10
FD		 443 if (ret) {
444 fprintf(stderr, "Error (%d) in dlclose\n", ret);
445 abort();
446 }
7863d51a 447 memset(lttng_ust_tracepoint_dlopen_ptr, 0, sizeof(*lttng_ust_tracepoint_dlopen_ptr));
46c881a7
MD		 448}
449
88c7c4ea
MJ		 450#if LTTNG_UST_COMPAT_API(0)
451# if defined(TRACEPOINT_DEFINE) && !defined(LTTNG_UST_TRACEPOINT_DEFINE)
452# define LTTNG_UST_TRACEPOINT_DEFINE
453# endif
454#endif /* #if LTTNG_UST_COMPAT_API(0) */
455
456#ifdef LTTNG_UST_TRACEPOINT_DEFINE
deb6e540 457
558b9d86
MD		 458/*
459 * These weak symbols, the constructor, and destructor take care of
460 * registering only _one_ instance of the tracepoints per shared-ojbect
461 * (or for the whole main program).
462 */
ac9f44c2 463extern struct lttng_ust_tracepoint * const __start_lttng_ust_tracepoints_ptrs[]
558b9d86 464 __attribute__((weak, visibility("hidden")));
ac9f44c2 465extern struct lttng_ust_tracepoint * const __stop_lttng_ust_tracepoints_ptrs[]
558b9d86
MD		 466 __attribute__((weak, visibility("hidden")));
467
628e1d81 468/*
341a19e8 469 * When LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a
628e1d81 470 * unresolved symbol that requires the provider to be linked in. When
341a19e8 471 * LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an
628e1d81
MD		 472 * unresolved symbol that depends on having the provider linked in,
473 * otherwise the linker complains. This deals with use of static
474 * libraries, ensuring that the linker does not remove the provider
475 * object from the executable.
476 */
341a19e8
MJ		 477
478#if LTTNG_UST_COMPAT_API(0)
479# if defined(TRACEPOINT_PROBE_DYNAMIC_LINKAGE) && !defined(LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE)
480# define LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE
481# endif
482#endif /* #if LTTNG_UST_COMPAT_API(0) */
483
484#ifdef LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE
485#define LTTNG_UST__TRACEPOINT_UNDEFINED_REF(provider) NULL
486#else /* LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
487#define LTTNG_UST__TRACEPOINT_UNDEFINED_REF(provider) &lttng_ust_tracepoint_provider_##provider
488#endif /* LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
628e1d81 489
b728d87e
MD		 490/*
491 * Note: to allow PIC code, we need to allow the linker to update the pointers
ac9f44c2 492 * in the lttng_ust_tracepoints_ptrs section.
b728d87e
MD		 493 * Therefore, this section is _not_ const (read-only).
494 */
341a19e8 495#define LTTNG_UST__TP_EXTRACT_STRING(...) #__VA_ARGS__
b4f3bc52 496
7f2f82c3 497#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args) \
81b16412 498 lttng_ust_tracepoint_validate_name_len(_provider, _name); \
29d6f421
MD		 499 extern int lttng_ust_tracepoint_provider_##_provider \
500 LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY; \
92866a9d 501 static const char lttng_ust_tp_provider_strtab_##_provider##___##_name[] \
ac9f44c2 502 __attribute__((section("lttng_ust_tracepoints_strings"))) = \
34f7f142 503 #_provider; \
92866a9d 504 static const char lttng_ust_tp_name_strtab_##_provider##___##_name[] \
ac9f44c2 505 __attribute__((section("lttng_ust_tracepoints_strings"))) = \
34f7f142 506 #_name; \
0274f7f2 507 struct lttng_ust_tracepoint lttng_ust_tracepoint_##_provider##___##_name \
29d6f421
MD		 508 __attribute__((section("lttng_ust_tracepoints"))) \
509 LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY = { \
f641d544 510 sizeof(struct lttng_ust_tracepoint), \
92866a9d
MJ		 511 lttng_ust_tp_provider_strtab_##_provider##___##_name, \
512 lttng_ust_tp_name_strtab_##_provider##___##_name, \
b4f3bc52
MD		 513 0, \
514 NULL, \
341a19e8
MJ		 515 LTTNG_UST__TRACEPOINT_UNDEFINED_REF(_provider), \
516 LTTNG_UST__TP_EXTRACT_STRING(_args), \
b4f3bc52 517 }; \
1a206094 518 static struct lttng_ust_tracepoint * \
0274f7f2 519 lttng_ust_tracepoint_ptr_##_provider##___##_name \
ac9f44c2 520 __attribute__((section("lttng_ust_tracepoints_ptrs"), used)) \
4f74bc5e 521 __lttng_ust_variable_attribute_no_sanitize_address = \
0274f7f2 522 &lttng_ust_tracepoint_##_provider##___##_name;
b728d87e 523
465a0d04 524static void
ac9f44c2 525lttng_ust__tracepoints__ptrs_init(void)
465a0d04 526 lttng_ust_notrace __attribute__((constructor));
a8909ba5 527static void
ac9f44c2 528lttng_ust__tracepoints__ptrs_init(void)
b728d87e 529{
0274f7f2 530 if (lttng_ust_tracepoint_ptrs_registered++)
b728d87e 531 return;
7863d51a
MJ		 532 if (!lttng_ust_tracepoint_dlopen_ptr)
533 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
534 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
535 lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle =
3d3dc207 536 dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
7863d51a 537 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
deb6e540 538 return;
62eb90f3
MJ		 539 if (!lttng_ust_tracepoint_destructors_syms_ptr)
540 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
14227bde 541 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register =
1a206094 542 URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *, int),
7863d51a 543 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
14227bde
MJ		 544 "lttng_ust_tracepoint_module_register"));
545 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister =
1a206094 546 URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *),
7863d51a 547 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
14227bde 548 "lttng_ust_tracepoint_module_unregister"));
62eb90f3 549 lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors =
0fd0de10 550 URCU_FORCE_CAST(void (*)(void),
7863d51a 551 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
096c06e5 552 "lttng_ust_tp_disable_destructors"));
62eb90f3 553 lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state =
0fd0de10 554 URCU_FORCE_CAST(int (*)(void),
7863d51a 555 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
096c06e5 556 "lttng_ust_tp_get_destructors_state"));
0274f7f2 557 lttng_ust_tracepoint__init_urcu_sym();
14227bde
MJ		 558 if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register) {
559 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register(__start_lttng_ust_tracepoints_ptrs,
ac9f44c2
MJ		 560 __stop_lttng_ust_tracepoints_ptrs -
561 __start_lttng_ust_tracepoints_ptrs);
99234da6 562 }
b728d87e
MD		 563}
564
c589eca2 565static void
ac9f44c2 566lttng_ust__tracepoints__ptrs_destroy(void)
c589eca2 567 lttng_ust_notrace __attribute__((destructor));
a8909ba5 568static void
ac9f44c2 569lttng_ust__tracepoints__ptrs_destroy(void)
b728d87e 570{
deb6e540 571 int ret;
51920067 572
0274f7f2 573 if (--lttng_ust_tracepoint_ptrs_registered)
b728d87e 574 return;
7863d51a
MJ		 575 if (!lttng_ust_tracepoint_dlopen_ptr)
576 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
62eb90f3
MJ		 577 if (!lttng_ust_tracepoint_destructors_syms_ptr)
578 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
14227bde
MJ		 579 if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister)
580 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister(__start_lttng_ust_tracepoints_ptrs);
7863d51a 581 if (lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle
62eb90f3
MJ		 582 && lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
583 && lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()
0274f7f2 584 && !lttng_ust_tracepoint_ptrs_registered) {
7863d51a 585 ret = dlclose(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle);
76aca78d
MD		 586 if (ret) {
587 fprintf(stderr, "Error (%d) in dlclose\n", ret);
588 abort();
589 }
7863d51a 590 memset(lttng_ust_tracepoint_dlopen_ptr, 0, sizeof(*lttng_ust_tracepoint_dlopen_ptr));
deb6e540 591 }
b728d87e
MD		 592}
593
88c7c4ea 594#else /* LTTNG_UST_TRACEPOINT_DEFINE */
46c881a7 595
7f2f82c3 596#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args)
46c881a7 597
88c7c4ea 598#endif /* #else LTTNG_UST_TRACEPOINT_DEFINE */
deb6e540 599
cbc06a3b
MD		 600#if LTTNG_UST_COMPAT_API(0)
601#define tracepoint lttng_ust_tracepoint
602#define do_tracepoint lttng_ust_do_tracepoint
603#define tracepoint_enabled lttng_ust_tracepoint_enabled
cadfcbfc 604#define TP_ARGS LTTNG_UST_TP_ARGS
cbc06a3b
MD		 605#endif /* #if LTTNG_UST_COMPAT_API(0) */
606
b728d87e
MD		 607#ifdef __cplusplus
608}
609#endif
610
9b14815a 611#endif /* _LTTNG_UST_TRACEPOINT_H */
b728d87e
MD		 612
613/* The following declarations must be outside re-inclusion protection. */
614
29d6f421
MD		 615/*
616 * LTTNG_UST_TRACEPOINT_HIDDEN_DEFINITION: Define this before including
617 * a tracepoint instrumentation header to hide symbols associated with
618 * tracepoint module instrumentation. This is useful if all compile
619 * units using the lttng_ust_tracepoint(),
620 * lttng_ust_tracepoint_enabled() and lttng_ust_do_tracepoint() macros
621 * is within the same module as the compile unit including the
622 * tracepoint header after defining LTTNG_UST_TRACEPOINT_DEFINE.
623 */
624
625#undef LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY
626#ifdef LTTNG_UST_TRACEPOINT_HIDDEN_DEFINITION
627#define LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY __attribute__((visibility("hidden")))
628#else
629#define LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY __attribute__((visibility("default")))
630#endif
631
632/*
633 * LTTNG_UST_TRACEPOINT_PROVIDER_HIDDEN_DEFINITION: Define this before
634 * including a tracepoint instrumentation header to hide symbols
635 * associated with the tracepoint provider. This is useful if the
636 * tracepoint definition (including the header after defining
637 * LTTNG_UST_TRACEPOINT_DEFINE) is in the same module as the provider
638 * (including the header after defining
639 * LTTNG_UST_TRACEPOINT_CREATE_PROBES).
640 */
641#undef LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY
642#ifdef LTTNG_UST_TRACEPOINT_PROVIDER_HIDDEN_DEFINITION
643#define LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY __attribute__((visibility("hidden")))
644#else
645#define LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY __attribute__((visibility("default")))
646#endif
647
2ebf164b 648#ifndef LTTNG_UST_TRACEPOINT_ENUM
c785c634
MD		 649
650/*
651 * Tracepoint Enumerations
652 *
653 * The enumeration is a mapping between an integer, or range of integers, and
654 * a string. It can be used to have a more compact trace in cases where the
655 * possible values for a field are limited:
656 *
657 * An example:
658 *
2ebf164b 659 * LTTNG_UST_TRACEPOINT_ENUM(someproject_component, enumname,
4849bc7a 660 * LTTNG_UST_TP_ENUM_VALUES(
78684808
MJ		 661 * lttng_ust_field_enum_value("even", 0)
662 * lttng_ust_field_enum_value("uneven", 1)
663 * lttng_ust_field_enum_range("twoto4", 2, 4)
664 * lttng_ust_field_enum_value("five", 5)
c785c634
MD		 665 * )
666 * )
667 *
668 * Where "someproject_component" is the name of the component this enumeration
669 * belongs to and "enumname" identifies this enumeration. Inside the
4849bc7a 670 * LTTNG_UST_TP_ENUM_VALUES macro is the actual mapping. Each string value can map
78684808
MJ		 671 * to either a single value with lttng_ust_field_enum_value or a range of values
672 * with lttng_ust_field_enum_range.
c785c634
MD		 673 *
674 * Enumeration ranges may overlap, but the behavior is implementation-defined,
675 * each trace reader will handle overlapping as it wishes.
676 *
677 * That enumeration can then be used in a field inside the TP_FIELD macro using
678 * the following line:
679 *
78684808 680 * lttng_ust_field_enum(someproject_component, enumname, enumtype, enumfield, enumval)
c785c634
MD		 681 *
682 * Where "someproject_component" and "enumname" match those in the
2ebf164b 683 * LTTNG_UST_TRACEPOINT_ENUM, "enumtype" is a signed or unsigned integer type
c785c634
MD		 684 * backing the enumeration, "enumfield" is the name of the field and
685 * "enumval" is the value.
686 */
687
2ebf164b 688#define LTTNG_UST_TRACEPOINT_ENUM(provider, name, values)
c785c634 689
2ebf164b
MJ		 690#if LTTNG_UST_COMPAT_API(0)
691#define TRACEPOINT_ENUM LTTNG_UST_TRACEPOINT_ENUM
692#endif /* #if LTTNG_UST_COMPAT_API(0) */
693
694#endif /* #ifndef LTTNG_UST_TRACEPOINT_ENUM */
c785c634 695
7f2f82c3 696#ifndef LTTNG_UST_TRACEPOINT_EVENT
b728d87e
MD		 697
698/*
7f2f82c3 699 * How to use the LTTNG_UST_TRACEPOINT_EVENT macro:
b728d87e
MD		 700 *
701 * An example:
a60af3a5 702 *
7f2f82c3 703 * LTTNG_UST_TRACEPOINT_EVENT(someproject_component, event_name,
b728d87e 704 *
cadfcbfc 705 * * LTTNG_UST_TP_ARGS takes from 0 to 10 "type, field_name" pairs *
b728d87e 706 *
cadfcbfc 707 * LTTNG_UST_TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen,
b728d87e
MD		 708 * long *, arg4, size_t, arg4_len),
709 *
efa14d16 710 * * LTTNG_UST_TP_FIELDS describes the event payload layout in the trace *
b728d87e 711 *
efa14d16 712 * LTTNG_UST_TP_FIELDS(
a60af3a5 713 * * Integer, printed in base 10 *
b4064f28 714 * lttng_ust_field_integer(int, field_a, arg0)
b728d87e 715 *
a60af3a5 716 * * Integer, printed with 0x base 16 *
b4064f28 717 * lttng_ust_field_integer_hex(unsigned long, field_d, arg1)
b728d87e 718 *
c785c634 719 * * Enumeration *
78684808 720 * lttng_ust_field_enum(someproject_component, enum_name, int, field_e, arg0)
c785c634 721 *
a60af3a5 722 * * Array Sequence, printed as UTF8-encoded array of bytes *
10937ee5 723 * lttng_ust_field_array_text(char, field_b, string, FIXED_LEN)
1d188af9 724 * lttng_ust_field_sequence_text(char, field_c, string, size_t, strlen)
b728d87e 725 *
a60af3a5 726 * * String, printed as UTF8-encoded string *
3202f63a 727 * lttng_ust_field_string(field_e, string)
b728d87e 728 *
a60af3a5 729 * * Array sequence of signed integer values *
10937ee5 730 * lttng_ust_field_array(long, field_f, arg4, FIXED_LEN4)
1d188af9 731 * lttng_ust_field_sequence(long, field_g, arg4, size_t, arg4_len)
b728d87e
MD		 732 * )
733 * )
734 *
735 * More detailed explanation:
736 *
737 * The name of the tracepoint is expressed as a tuple with the provider
738 * and name arguments.
739 *
740 * The provider and name should be a proper C99 identifier.
741 * The "provider" and "name" MUST follow these rules to ensure no
742 * namespace clash occurs:
743 *
744 * For projects (applications and libraries) for which an entity
745 * specific to the project controls the source code and thus its
746 * tracepoints (typically with a scope larger than a single company):
747 *
748 * either:
749 * project_component, event
750 * or:
751 * project, event
752 *
753 * Where "project" is the name of the project,
754 * "component" is the name of the project component (which may
755 * include several levels of sub-components, e.g.
756 * ...component_subcomponent_...) where the tracepoint is located
757 * (optional),
758 * "event" is the name of the tracepoint event.
759 *
760 * For projects issued from a single company wishing to advertise that
761 * the company controls the source code and thus the tracepoints, the
762 * "com_" prefix should be used:
763 *
764 * either:
765 * com_company_project_component, event
766 * or:
767 * com_company_project, event
768 *
769 * Where "company" is the name of the company,
770 * "project" is the name of the project,
771 * "component" is the name of the project component (which may
772 * include several levels of sub-components, e.g.
773 * ...component_subcomponent_...) where the tracepoint is located
774 * (optional),
775 * "event" is the name of the tracepoint event.
776 *
777 * the provider:event identifier is limited to 127 characters.
778 */
779
7f2f82c3 780#define LTTNG_UST_TRACEPOINT_EVENT(provider, name, args, fields) \
6eddcb06
MJ		 781 LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
782 LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
b728d87e 783
7f2f82c3 784#define LTTNG_UST_TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
b728d87e 785
71ca4083 786#define LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(template_provider, template_name, provider, name, args) \
6eddcb06
MJ		 787 LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
788 LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
b728d87e 789
7f2f82c3
MJ		 790#if LTTNG_UST_COMPAT_API(0)
791#define TRACEPOINT_EVENT LTTNG_UST_TRACEPOINT_EVENT
792#define TRACEPOINT_EVENT_CLASS LTTNG_UST_TRACEPOINT_EVENT_CLASS
71ca4083
MD		 793#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, args) \
794 LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(_provider, _template, \
795 _provider, _name, LTTNG_UST__TP_PARAMS(args))
796
7f2f82c3
MJ		 797#endif /* #if LTTNG_UST_COMPAT_API(0) */
798
799#endif /* #ifndef LTTNG_UST_TRACEPOINT_EVENT */
b728d87e 800
612e9ce4 801#ifndef LTTNG_UST_TRACEPOINT_LOGLEVEL
b728d87e
MD		 802
803/*
75c5ad79 804 * Tracepoint Loglevels
b728d87e
MD		 805 *
806 * Typical use of these loglevels:
807 *
d8de1354 808 * The loglevels go from 0 to 14. Higher numbers imply the most
75c5ad79
MD		 809 * verbosity (higher event throughput expected.
810 *
d8de1354
MD		 811 * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels
812 * semantic. Loglevels 7 through 13 offer more fine-grained selection of
813 * debug information.
75c5ad79 814 *
612e9ce4 815 * LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG 0
75c5ad79
MD		 816 * system is unusable
817 *
612e9ce4 818 * LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT 1
75c5ad79
MD		 819 * action must be taken immediately
820 *
612e9ce4 821 * LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT 2
75c5ad79
MD		 822 * critical conditions
823 *
612e9ce4 824 * LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR 3
75c5ad79
MD		 825 * error conditions
826 *
612e9ce4 827 * LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING 4
75c5ad79
MD		 828 * warning conditions
829 *
612e9ce4 830 * LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE 5
75c5ad79
MD		 831 * normal, but significant, condition
832 *
612e9ce4 833 * LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO 6
75c5ad79
MD		 834 * informational message
835 *
612e9ce4 836 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM 7
d8de1354 837 * debug information with system-level scope (set of programs)
75c5ad79 838 *
612e9ce4 839 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM 8
d8de1354 840 * debug information with program-level scope (set of processes)
75c5ad79 841 *
612e9ce4 842 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS 9
d8de1354 843 * debug information with process-level scope (set of modules)
75c5ad79 844 *
612e9ce4 845 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE 10
d8de1354 846 * debug information with module (executable/library) scope (set of units)
75c5ad79 847 *
612e9ce4 848 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT 11
d8de1354 849 * debug information with compilation unit scope (set of functions)
75c5ad79 850 *
612e9ce4 851 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION 12
d8de1354 852 * debug information with function-level scope
75c5ad79 853 *
612e9ce4 854 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE 13
7f2f82c3 855 * debug information with line-level scope (LTTNG_UST_TRACEPOINT_EVENT default)
902e1379 856 *
612e9ce4 857 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG 14
1e3b0059 858 * debug-level message
75c5ad79 859 *
7f2f82c3 860 * Declare tracepoint loglevels for tracepoints. A LTTNG_UST_TRACEPOINT_EVENT
612e9ce4 861 * should be declared prior to the the LTTNG_UST_TRACEPOINT_LOGLEVEL for a given
853cda88
MD		 862 * tracepoint name. The first field is the provider name, the second
863 * field is the name of the tracepoint, the third field is the loglevel
864 * name.
b728d87e 865 *
612e9ce4 866 * LTTNG_UST_TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >,
b728d87e
MD		 867 * < loglevel_name >)
868 *
5b393d64 869 * The LTTNG_UST_TRACEPOINT_PROVIDER must be already declared before declaring a
612e9ce4 870 * LTTNG_UST_TRACEPOINT_LOGLEVEL.
b728d87e
MD		 871 */
872
882a56d7 873enum {
612e9ce4
MJ		 874 LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG = 0,
875 LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT = 1,
876 LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT = 2,
877 LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR = 3,
878 LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING = 4,
879 LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE = 5,
880 LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO = 6,
881 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM = 7,
882 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM = 8,
883 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS = 9,
884 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE = 10,
885 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT = 11,
886 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION = 12,
887 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE = 13,
888 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG = 14,
882a56d7
MD		 889};
890
612e9ce4 891#define LTTNG_UST_TRACEPOINT_LOGLEVEL(provider, name, loglevel)
b728d87e 892
612e9ce4
MJ		 893#if LTTNG_UST_COMPAT_API(0)
894#define TRACEPOINT_LOGLEVEL LTTNG_UST_TRACEPOINT_LOGLEVEL
895
896#define TRACE_EMERG LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG
897#define TRACE_ALERT LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT
898#define TRACE_CRIT LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT
899#define TRACE_ERR LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR
900#define TRACE_WARNING LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING
901#define TRACE_NOTICE LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE
902#define TRACE_INFO LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO
903#define TRACE_DEBUG_SYSTEM LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM
904#define TRACE_DEBUG_PROGRAM LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM
905#define TRACE_DEBUG_PROCESS LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS
906#define TRACE_DEBUG_MODULE LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE
907#define TRACE_DEBUG_UNIT LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT
908#define TRACE_DEBUG_FUNCTION LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION
909#define TRACE_DEBUG_LINE LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE
910#define TRACE_DEBUG LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG
911#endif
912
913#endif /* #ifndef LTTNG_UST_TRACEPOINT_LOGLEVEL */
6ddc916d 914
dbcc2f92 915#ifndef LTTNG_UST_TRACEPOINT_MODEL_EMF_URI
6ddc916d 916
dbcc2f92 917#define LTTNG_UST_TRACEPOINT_MODEL_EMF_URI(provider, name, uri)
6ddc916d 918
dbcc2f92
MJ		 919#if LTTNG_UST_COMPAT_API(0)
920#define TRACEPOINT_MODEL_EMF_URI LTTNG_UST_TRACEPOINT_MODEL_EMF_URI
921#endif
922
923#endif /* #ifndef LTTNG_UST_TRACEPOINT_MODEL_EMF_URI */
LTTng 2.0 Userspace Tracer
This page took 0.101266 seconds and 4 git commands to generate.