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tracepoints: print debug message when lttng-ust-tracepoint.so is not found
[lttng-ust.git] / include / lttng / tracepoint.h
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1/*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 */
6
7#ifndef _LTTNG_UST_TRACEPOINT_H
8#define _LTTNG_UST_TRACEPOINT_H
9
10#include <stdio.h>
11#include <stdlib.h>
12#include <lttng/tracepoint-types.h>
13#include <lttng/tracepoint-rcu.h>
14#include <lttng/ust-utils.h>
15#include <sys/types.h>
16#include <unistd.h>
17
18#include <urcu/compiler.h>
19#include <urcu/system.h>
20#include <dlfcn.h> /* for dlopen */
21#include <string.h> /* for memset */
22#include <stdbool.h>
23
24#include <lttng/ust-config.h> /* for sdt */
25#include <lttng/ust-compiler.h>
26#include <lttng/ust-tracer.h>
27#include <lttng/ust-api-compat.h>
28
29#define LTTNG_UST_TRACEPOINT_NAME_LEN_MAX 256
30
31#ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
32/*
33 * Instead of using SDT_USE_VARIADIC from 'sys/sdt.h', use our own namespaced
34 * macros since the instrumented application might already have included
35 * 'sys/sdt.h' without variadic support.
36 */
37#include <sys/sdt.h>
38
39#define LTTNG_UST__SDT_NARG(...) \
40 LTTNG_UST___SDT_NARG(__VA_ARGS__, 12,11,10,9,8,7,6,5,4,3,2,1,0)
41
42#define LTTNG_UST___SDT_NARG(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12, N, ...) N
43
44#define LTTNG_UST__SDT_PROBE_N(provider, name, N, ...) \
45 _SDT_PROBE(provider, name, N, (__VA_ARGS__))
46
47#define LTTNG_UST_STAP_PROBEV(provider, name, ...) \
48 LTTNG_UST__SDT_PROBE_N(provider, name, LTTNG_UST__SDT_NARG(0, ##__VA_ARGS__), ##__VA_ARGS__)
49
50#else
51#define LTTNG_UST_STAP_PROBEV(...)
52#endif
53
54#ifdef __cplusplus
55extern "C" {
56#endif
57
58#define lttng_ust_tracepoint_enabled(provider, name) \
59 caa_unlikely(CMM_LOAD_SHARED(lttng_ust_tracepoint_##provider##___##name.state))
60
61#define lttng_ust_do_tracepoint(provider, name, ...) \
62 lttng_ust_tracepoint_cb_##provider##___##name(__VA_ARGS__)
63
64#define lttng_ust_tracepoint(provider, name, ...) \
65 do { \
66 LTTNG_UST_STAP_PROBEV(provider, name, ## __VA_ARGS__); \
67 if (lttng_ust_tracepoint_enabled(provider, name)) \
68 lttng_ust_do_tracepoint(provider, name, __VA_ARGS__); \
69 } while (0)
70
71#define LTTNG_UST_TP_ARGS(...) __VA_ARGS__
72
73/*
74 * LTTNG_UST_TP_ARGS takes tuples of type, argument separated by a comma.
75 * It can take up to 10 tuples (which means that less than 10 tuples is
76 * fine too).
77 * Each tuple is also separated by a comma.
78 */
79#define LTTNG_UST___TP_COMBINE_TOKENS(_tokena, _tokenb) \
80 _tokena##_tokenb
81#define LTTNG_UST__TP_COMBINE_TOKENS(_tokena, _tokenb) \
82 LTTNG_UST___TP_COMBINE_TOKENS(_tokena, _tokenb)
83#define LTTNG_UST___TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
84 _tokena##_tokenb##_tokenc
85#define LTTNG_UST__TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
86 LTTNG_UST___TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc)
87#define LTTNG_UST___TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
88 _tokena##_tokenb##_tokenc##_tokend
89#define LTTNG_UST__TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
90 LTTNG_UST___TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend)
91
92/*
93 * LTTNG_UST__TP_EXVAR* extract the var names.
94 * LTTNG_UST__TP_EXVAR1 and LTTNG_UST__TP_EXDATA_VAR1 are needed for -std=c99.
95 */
96#define LTTNG_UST__TP_EXVAR0()
97#define LTTNG_UST__TP_EXVAR1(a)
98#define LTTNG_UST__TP_EXVAR2(a,b) b
99#define LTTNG_UST__TP_EXVAR4(a,b,c,d) b,d
100#define LTTNG_UST__TP_EXVAR6(a,b,c,d,e,f) b,d,f
101#define LTTNG_UST__TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h
102#define LTTNG_UST__TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j
103#define LTTNG_UST__TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l
104#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
105#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
106#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
107#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
108
109#define LTTNG_UST__TP_EXDATA_VAR0() __tp_data
110#define LTTNG_UST__TP_EXDATA_VAR1(a) __tp_data
111#define LTTNG_UST__TP_EXDATA_VAR2(a,b) __tp_data,b
112#define LTTNG_UST__TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d
113#define LTTNG_UST__TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f
114#define LTTNG_UST__TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h
115#define LTTNG_UST__TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j
116#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
117#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
118#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
119#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
120#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
121
122/*
123 * LTTNG_UST__TP_EXPROTO* extract tuples of type, var.
124 * LTTNG_UST__TP_EXPROTO1 and LTTNG_UST__TP_EXDATA_PROTO1 are needed for -std=c99.
125 */
126#define LTTNG_UST__TP_EXPROTO0() void
127#define LTTNG_UST__TP_EXPROTO1(a) void
128#define LTTNG_UST__TP_EXPROTO2(a,b) a b
129#define LTTNG_UST__TP_EXPROTO4(a,b,c,d) a b,c d
130#define LTTNG_UST__TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f
131#define LTTNG_UST__TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h
132#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
133#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
134#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
135#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
136#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
137#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
138
139#define LTTNG_UST__TP_EXDATA_PROTO0() void *__tp_data
140#define LTTNG_UST__TP_EXDATA_PROTO1(a) void *__tp_data
141#define LTTNG_UST__TP_EXDATA_PROTO2(a,b) void *__tp_data,a b
142#define LTTNG_UST__TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d
143#define LTTNG_UST__TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f
144#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
145#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
146#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
147#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
148#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
149#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
150#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
151
152/* Preprocessor trick to count arguments. Inspired from sdt.h. */
153#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)
154#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
155#define LTTNG_UST__TP_PROTO_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXPROTO, N)(__VA_ARGS__))
156#define LTTNG_UST__TP_VAR_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXVAR, N)(__VA_ARGS__))
157#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__))
158#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__))
159#define LTTNG_UST__TP_ARGS_PROTO(...) LTTNG_UST__TP_PROTO_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
160#define LTTNG_UST__TP_ARGS_VAR(...) LTTNG_UST__TP_VAR_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
161#define LTTNG_UST__TP_ARGS_DATA_PROTO(...) LTTNG_UST__TP_DATA_PROTO_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
162#define LTTNG_UST__TP_ARGS_DATA_VAR(...) LTTNG_UST__TP_DATA_VAR_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
163#define LTTNG_UST__TP_PARAMS(...) __VA_ARGS__
164
165/*
166 * sizeof(#_provider) - 1 : length of the provider string (excluding \0).
167 * sizeof(#_name) - 1 : length of the name string (excluding \0).
168 * + 1 : separator between provider and event name.
169 *
170 * Upper bound (inclusive) is LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1 to
171 * account for \0.
172 *
173 * The comparison is:
174 * left hand side: sizeof(#_provider) - 1 + sizeof(#_name) - 1 + 1
175 * right hand side: LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1
176 * operator: <= (inclusive)
177 * Simplified in the code below.
178 */
179#define lttng_ust_tracepoint_validate_name_len(_provider, _name) \
180 lttng_ust_static_assert(sizeof(#_provider) + sizeof(#_name) <= LTTNG_UST_TRACEPOINT_NAME_LEN_MAX, \
181 "Tracepoint name length is too long", \
182 Tracepoint_name_length_is_too_long)
183
184/*
185 * The tracepoint cb is marked always inline so we can distinguish
186 * between caller's ip addresses within the probe using the return
187 * address.
188 */
189#define LTTNG_UST__DECLARE_TRACEPOINT(_provider, _name, ...) \
190extern struct lttng_ust_tracepoint lttng_ust_tracepoint_##_provider##___##_name \
191 LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY; \
192static inline \
193void lttng_ust_tracepoint_cb_##_provider##___##_name(LTTNG_UST__TP_ARGS_PROTO(__VA_ARGS__)) \
194 __attribute__((always_inline, unused)) lttng_ust_notrace; \
195static \
196void lttng_ust_tracepoint_cb_##_provider##___##_name(LTTNG_UST__TP_ARGS_PROTO(__VA_ARGS__)) \
197{ \
198 struct lttng_ust_tracepoint_probe *__tp_probe; \
199 \
200 if (caa_unlikely(!LTTNG_UST_TP_RCU_LINK_TEST())) \
201 return; \
202 lttng_ust_tp_rcu_read_lock(); \
203 __tp_probe = lttng_ust_tp_rcu_dereference(lttng_ust_tracepoint_##_provider##___##_name.probes); \
204 if (caa_unlikely(!__tp_probe)) \
205 goto end; \
206 do { \
207 void (*__tp_cb)(void) = __tp_probe->func; \
208 void *__tp_data = __tp_probe->data; \
209 \
210 URCU_FORCE_CAST(void (*)(LTTNG_UST__TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \
211 (LTTNG_UST__TP_ARGS_DATA_VAR(__VA_ARGS__)); \
212 } while ((++__tp_probe)->func); \
213end: \
214 lttng_ust_tp_rcu_read_unlock(); \
215} \
216static inline \
217void lttng_ust_tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
218 void (*func)(void), void *data) \
219 lttng_ust_notrace; \
220static inline \
221void lttng_ust_tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
222 void (*func)(void), void *data) \
223{ \
224 lttng_ust_tracepoint_provider_register(provider_name, event_name, func, data, \
225 lttng_ust_tracepoint_##_provider##___##_name.signature); \
226} \
227static inline \
228void lttng_ust_tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
229 void (*func)(void), void *data) \
230 lttng_ust_notrace; \
231static inline \
232void lttng_ust_tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
233 void (*func)(void), void *data) \
234{ \
235 lttng_ust_tracepoint_provider_unregister(provider_name, event_name, func, data); \
236}
237
238/*
239 * Registration of tracepoint provider probe functions with
240 * lttng_ust_tracepoint_provider_register, unregistration with
241 * lttng_ust_tracepoint_provider_unregister.
242 */
243int lttng_ust_tracepoint_provider_register(const char *provider_name, const char *event_name,
244 void (*func)(void), void *data, const char *signature);
245int lttng_ust_tracepoint_provider_unregister(const char *provider_name, const char *event_name,
246 void (*func)(void), void *data);
247
248/*
249 * Registration of tracepoint instrumentation modules with lttng_ust_tracepoint_module_register,
250 * unregistration with lttng_ust_tracepoint_module_unregister.
251 */
252int lttng_ust_tracepoint_module_register(struct lttng_ust_tracepoint * const *tracepoints_start,
253 int tracepoints_count);
254int lttng_ust_tracepoint_module_unregister(struct lttng_ust_tracepoint * const *tracepoints_start);
255
256/*
257 * tracepoint dynamic linkage handling (callbacks). Hidden visibility:
258 * shared across objects in a module/main executable.
259 *
260 * IMPORTANT: this structure is part of the ABI between instrumented
261 * applications and UST. Fields need to be only added at the end, never
262 * reordered, never removed.
263 *
264 * The field @struct_size should be used to determine the size of the
265 * structure. It should be queried before using additional fields added
266 * at the end of the structure.
267 */
268struct lttng_ust_tracepoint_dlopen {
269 uint32_t struct_size;
270
271 void *liblttngust_handle;
272
273 int (*lttng_ust_tracepoint_module_register)(struct lttng_ust_tracepoint * const *tracepoints_start,
274 int tracepoints_count);
275 int (*lttng_ust_tracepoint_module_unregister)(struct lttng_ust_tracepoint * const *tracepoints_start);
276 void (*rcu_read_lock_sym)(void);
277 void (*rcu_read_unlock_sym)(void);
278 void *(*rcu_dereference_sym)(void *p);
279
280 /* End of base ABI. Fields below should be used after checking struct_size. */
281};
282
283extern struct lttng_ust_tracepoint_dlopen lttng_ust_tracepoint_dlopen;
284extern struct lttng_ust_tracepoint_dlopen *lttng_ust_tracepoint_dlopen_ptr;
285
286/*
287 * These weak symbols, the constructor, and destructor take care of
288 * registering only _one_ instance of the tracepoints per shared-ojbect
289 * (or for the whole main program).
290 */
291int lttng_ust_tracepoint_registered
292 __attribute__((weak, visibility("hidden")));
293int lttng_ust_tracepoint_ptrs_registered
294 __attribute__((weak, visibility("hidden")));
295struct lttng_ust_tracepoint_dlopen lttng_ust_tracepoint_dlopen
296 __attribute__((weak, visibility("hidden"))) = {
297 .struct_size = sizeof(struct lttng_ust_tracepoint_dlopen),
298};
299/*
300 * Deal with gcc O1 optimisation issues with weak hidden symbols. gcc
301 * 4.8 and prior does not have the same behavior for symbol scoping on
302 * 32-bit powerpc depending on the object size: symbols for objects of 8
303 * bytes or less have the same address throughout a module, whereas they
304 * have different addresses between compile units for objects larger
305 * than 8 bytes. Add this pointer indirection to ensure that the symbol
306 * scoping match that of the other weak hidden symbols found in this
307 * header.
308 */
309struct lttng_ust_tracepoint_dlopen *lttng_ust_tracepoint_dlopen_ptr
310 __attribute__((weak, visibility("hidden")));
311
312/*
313 * Tracepoint dynamic linkage handling (callbacks). Hidden visibility: shared
314 * across objects in a module/main executable. The callbacks are used to
315 * control and check if the destructors should be executed.
316 *
317 * IMPORTANT: this structure is part of the ABI between instrumented
318 * applications and UST. Fields need to be only added at the end, never
319 * reordered, never removed.
320 *
321 * The field @struct_size should be used to determine the size of the
322 * structure. It should be queried before using additional fields added
323 * at the end of the structure.
324 */
325struct lttng_ust_tracepoint_destructors_syms {
326 uint32_t struct_size;
327
328 void (*tracepoint_disable_destructors)(void);
329 int (*tracepoint_get_destructors_state)(void);
330
331 /* End of base ABI. Fields below should be used after checking struct_size. */
332};
333
334extern struct lttng_ust_tracepoint_destructors_syms lttng_ust_tracepoint_destructors_syms;
335extern struct lttng_ust_tracepoint_destructors_syms *lttng_ust_tracepoint_destructors_syms_ptr;
336
337struct lttng_ust_tracepoint_destructors_syms lttng_ust_tracepoint_destructors_syms
338 __attribute__((weak, visibility("hidden"))) = {
339 .struct_size = sizeof(struct lttng_ust_tracepoint_destructors_syms),
340};
341struct lttng_ust_tracepoint_destructors_syms *lttng_ust_tracepoint_destructors_syms_ptr
342 __attribute__((weak, visibility("hidden")));
343
344static inline void tracepoint_disable_destructors(void)
345{
346 if (!lttng_ust_tracepoint_dlopen_ptr)
347 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
348 if (!lttng_ust_tracepoint_destructors_syms_ptr)
349 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
350 if (lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle
351 && lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors)
352 lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors();
353}
354
355#ifndef _LGPL_SOURCE
356static inline void
357lttng_ust_tracepoint__init_urcu_sym(void)
358 lttng_ust_notrace;
359static inline void
360lttng_ust_tracepoint__init_urcu_sym(void)
361{
362 if (!lttng_ust_tracepoint_dlopen_ptr)
363 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
364 /*
365 * Symbols below are needed by tracepoint call sites and probe
366 * providers.
367 */
368 if (!lttng_ust_tracepoint_dlopen_ptr->rcu_read_lock_sym)
369 lttng_ust_tracepoint_dlopen_ptr->rcu_read_lock_sym =
370 URCU_FORCE_CAST(void (*)(void),
371 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
372 "lttng_ust_tp_rcu_read_lock"));
373 if (!lttng_ust_tracepoint_dlopen_ptr->rcu_read_unlock_sym)
374 lttng_ust_tracepoint_dlopen_ptr->rcu_read_unlock_sym =
375 URCU_FORCE_CAST(void (*)(void),
376 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
377 "lttng_ust_tp_rcu_read_unlock"));
378 if (!lttng_ust_tracepoint_dlopen_ptr->rcu_dereference_sym)
379 lttng_ust_tracepoint_dlopen_ptr->rcu_dereference_sym =
380 URCU_FORCE_CAST(void *(*)(void *p),
381 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
382 "lttng_ust_tp_rcu_dereference_sym"));
383}
384#else
385static inline void
386lttng_ust_tracepoint__init_urcu_sym(void)
387 lttng_ust_notrace;
388static inline void
389lttng_ust_tracepoint__init_urcu_sym(void)
390{
391}
392#endif
393
394/*
395 * Use getenv() directly and bypass lttng-ust helper functions
396 * because we may not have access to lttng-ust shared libraries.
397 */
398#ifdef LTTNG_UST_DEBUG
399static inline
400bool lttng_ust_tracepoint_logging_debug_enabled(void)
401{
402 return true;
403}
404#else /* #ifdef LTTNG_UST_DEBUG */
405static inline
406bool lttng_ust_tracepoint_logging_debug_enabled(void)
407{
408 return getenv("LTTNG_UST_DEBUG");
409}
410#endif /* #ifdef LTTNG_UST_DEBUG */
411
412#define LTTNG_UST_TRACEPOINT_THIS_IP \
413 ({ __label__ here; here: &&here; })
414
415static void
416lttng_ust_tracepoints_print_disabled_message(void)
417{
418 if (!lttng_ust_tracepoint_logging_debug_enabled())
419 return;
420 fprintf(stderr, "lttng-ust-tracepoint [%ld]: dlopen() failed to find '%s', tracepoints in this binary won't be registered. "
421 "(at addr=%p in %s() at " __FILE__ ":" lttng_ust_stringify(__LINE__) ")\n",
422 (long) getpid(),
423 LTTNG_UST_TRACEPOINT_LIB_SONAME,
424 LTTNG_UST_TRACEPOINT_THIS_IP,
425 __func__);
426}
427
428static void
429lttng_ust__tracepoints__init(void)
430 lttng_ust_notrace __attribute__((constructor));
431static void
432lttng_ust__tracepoints__init(void)
433{
434 if (lttng_ust_tracepoint_registered++) {
435 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
436 return;
437 lttng_ust_tracepoint__init_urcu_sym();
438 return;
439 }
440
441 if (!lttng_ust_tracepoint_dlopen_ptr)
442 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
443 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
444 lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle =
445 dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
446 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle) {
447 lttng_ust_tracepoints_print_disabled_message();
448 return;
449 }
450 lttng_ust_tracepoint__init_urcu_sym();
451}
452
453static void
454lttng_ust__tracepoints__destroy(void)
455 lttng_ust_notrace __attribute__((destructor));
456static void
457lttng_ust__tracepoints__destroy(void)
458{
459 int ret;
460
461 if (--lttng_ust_tracepoint_registered)
462 return;
463 if (!lttng_ust_tracepoint_dlopen_ptr)
464 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
465 if (!lttng_ust_tracepoint_destructors_syms_ptr)
466 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
467 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
468 return;
469 if (lttng_ust_tracepoint_ptrs_registered)
470 return;
471 /*
472 * Lookup if destructors must be executed using the new method.
473 */
474 if (lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
475 && !lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()) {
476 /*
477 * The tracepoint_get_destructors_state symbol was found with
478 * dlsym but its returned value is 0 meaning that destructors
479 * must not be executed.
480 */
481 return;
482 }
483 ret = dlclose(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle);
484 if (ret) {
485 fprintf(stderr, "Error (%d) in dlclose\n", ret);
486 abort();
487 }
488 memset(lttng_ust_tracepoint_dlopen_ptr, 0, sizeof(*lttng_ust_tracepoint_dlopen_ptr));
489}
490
491#if LTTNG_UST_COMPAT_API(0)
492# if defined(TRACEPOINT_DEFINE) && !defined(LTTNG_UST_TRACEPOINT_DEFINE)
493# define LTTNG_UST_TRACEPOINT_DEFINE
494# endif
495#endif /* #if LTTNG_UST_COMPAT_API(0) */
496
497#ifdef LTTNG_UST_TRACEPOINT_DEFINE
498
499/*
500 * These weak symbols, the constructor, and destructor take care of
501 * registering only _one_ instance of the tracepoints per shared-ojbect
502 * (or for the whole main program).
503 */
504extern struct lttng_ust_tracepoint * const __start_lttng_ust_tracepoints_ptrs[]
505 __attribute__((weak, visibility("hidden")));
506extern struct lttng_ust_tracepoint * const __stop_lttng_ust_tracepoints_ptrs[]
507 __attribute__((weak, visibility("hidden")));
508
509/*
510 * When LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a
511 * unresolved symbol that requires the provider to be linked in. When
512 * LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an
513 * unresolved symbol that depends on having the provider linked in,
514 * otherwise the linker complains. This deals with use of static
515 * libraries, ensuring that the linker does not remove the provider
516 * object from the executable.
517 */
518
519#if LTTNG_UST_COMPAT_API(0)
520# if defined(TRACEPOINT_PROBE_DYNAMIC_LINKAGE) && !defined(LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE)
521# define LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE
522# endif
523#endif /* #if LTTNG_UST_COMPAT_API(0) */
524
525#ifdef LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE
526#define LTTNG_UST__TRACEPOINT_UNDEFINED_REF(provider) NULL
527#else /* LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
528#define LTTNG_UST__TRACEPOINT_UNDEFINED_REF(provider) &lttng_ust_tracepoint_provider_##provider
529#endif /* LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
530
531/*
532 * Note: to allow PIC code, we need to allow the linker to update the pointers
533 * in the lttng_ust_tracepoints_ptrs section.
534 * Therefore, this section is _not_ const (read-only).
535 */
536#define LTTNG_UST__TP_EXTRACT_STRING(...) #__VA_ARGS__
537
538#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args) \
539 lttng_ust_tracepoint_validate_name_len(_provider, _name); \
540 extern int lttng_ust_tracepoint_provider_##_provider \
541 LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY; \
542 static const char lttng_ust_tp_provider_strtab_##_provider##___##_name[] \
543 __attribute__((section("lttng_ust_tracepoints_strings"))) = \
544 #_provider; \
545 static const char lttng_ust_tp_name_strtab_##_provider##___##_name[] \
546 __attribute__((section("lttng_ust_tracepoints_strings"))) = \
547 #_name; \
548 struct lttng_ust_tracepoint lttng_ust_tracepoint_##_provider##___##_name \
549 __attribute__((section("lttng_ust_tracepoints"))) \
550 LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY = { \
551 sizeof(struct lttng_ust_tracepoint), \
552 lttng_ust_tp_provider_strtab_##_provider##___##_name, \
553 lttng_ust_tp_name_strtab_##_provider##___##_name, \
554 0, \
555 NULL, \
556 LTTNG_UST__TRACEPOINT_UNDEFINED_REF(_provider), \
557 LTTNG_UST__TP_EXTRACT_STRING(_args), \
558 }; \
559 static struct lttng_ust_tracepoint * \
560 lttng_ust_tracepoint_ptr_##_provider##___##_name \
561 __attribute__((section("lttng_ust_tracepoints_ptrs"), used)) \
562 __lttng_ust_variable_attribute_no_sanitize_address = \
563 &lttng_ust_tracepoint_##_provider##___##_name;
564
565static void
566lttng_ust__tracepoints__ptrs_init(void)
567 lttng_ust_notrace __attribute__((constructor));
568static void
569lttng_ust__tracepoints__ptrs_init(void)
570{
571 if (lttng_ust_tracepoint_ptrs_registered++)
572 return;
573 if (!lttng_ust_tracepoint_dlopen_ptr)
574 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
575 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
576 lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle =
577 dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
578 if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle) {
579 lttng_ust_tracepoints_print_disabled_message();
580 return;
581 }
582 if (!lttng_ust_tracepoint_destructors_syms_ptr)
583 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
584 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register =
585 URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *, int),
586 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
587 "lttng_ust_tracepoint_module_register"));
588 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister =
589 URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *),
590 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
591 "lttng_ust_tracepoint_module_unregister"));
592 lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors =
593 URCU_FORCE_CAST(void (*)(void),
594 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
595 "lttng_ust_tp_disable_destructors"));
596 lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state =
597 URCU_FORCE_CAST(int (*)(void),
598 dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
599 "lttng_ust_tp_get_destructors_state"));
600 lttng_ust_tracepoint__init_urcu_sym();
601 if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register) {
602 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register(__start_lttng_ust_tracepoints_ptrs,
603 __stop_lttng_ust_tracepoints_ptrs -
604 __start_lttng_ust_tracepoints_ptrs);
605 }
606}
607
608static void
609lttng_ust__tracepoints__ptrs_destroy(void)
610 lttng_ust_notrace __attribute__((destructor));
611static void
612lttng_ust__tracepoints__ptrs_destroy(void)
613{
614 int ret;
615
616 if (--lttng_ust_tracepoint_ptrs_registered)
617 return;
618 if (!lttng_ust_tracepoint_dlopen_ptr)
619 lttng_ust_tracepoint_dlopen_ptr = &lttng_ust_tracepoint_dlopen;
620 if (!lttng_ust_tracepoint_destructors_syms_ptr)
621 lttng_ust_tracepoint_destructors_syms_ptr = &lttng_ust_tracepoint_destructors_syms;
622 if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister)
623 lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister(__start_lttng_ust_tracepoints_ptrs);
624 if (lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle
625 && lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
626 && lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()
627 && !lttng_ust_tracepoint_ptrs_registered) {
628 ret = dlclose(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle);
629 if (ret) {
630 fprintf(stderr, "Error (%d) in dlclose\n", ret);
631 abort();
632 }
633 memset(lttng_ust_tracepoint_dlopen_ptr, 0, sizeof(*lttng_ust_tracepoint_dlopen_ptr));
634 }
635}
636
637#else /* LTTNG_UST_TRACEPOINT_DEFINE */
638
639#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args)
640
641#endif /* #else LTTNG_UST_TRACEPOINT_DEFINE */
642
643#if LTTNG_UST_COMPAT_API(0)
644#define tracepoint lttng_ust_tracepoint
645#define do_tracepoint lttng_ust_do_tracepoint
646#define tracepoint_enabled lttng_ust_tracepoint_enabled
647#define TP_ARGS LTTNG_UST_TP_ARGS
648#endif /* #if LTTNG_UST_COMPAT_API(0) */
649
650#ifdef __cplusplus
651}
652#endif
653
654#endif /* _LTTNG_UST_TRACEPOINT_H */
655
656/* The following declarations must be outside re-inclusion protection. */
657
658/*
659 * LTTNG_UST_TRACEPOINT_HIDDEN_DEFINITION: Define this before including
660 * a tracepoint instrumentation header to hide symbols associated with
661 * tracepoint module instrumentation. This is useful if all compile
662 * units using the lttng_ust_tracepoint(),
663 * lttng_ust_tracepoint_enabled() and lttng_ust_do_tracepoint() macros
664 * is within the same module as the compile unit including the
665 * tracepoint header after defining LTTNG_UST_TRACEPOINT_DEFINE.
666 */
667
668#undef LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY
669#ifdef LTTNG_UST_TRACEPOINT_HIDDEN_DEFINITION
670#define LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY __attribute__((visibility("hidden")))
671#else
672#define LTTNG_UST__TRACEPOINT_DEFINITION_VISIBILITY __attribute__((visibility("default")))
673#endif
674
675/*
676 * LTTNG_UST_TRACEPOINT_PROVIDER_HIDDEN_DEFINITION: Define this before
677 * including a tracepoint instrumentation header to hide symbols
678 * associated with the tracepoint provider. This is useful if the
679 * tracepoint definition (including the header after defining
680 * LTTNG_UST_TRACEPOINT_DEFINE) is in the same module as the provider
681 * (including the header after defining
682 * LTTNG_UST_TRACEPOINT_CREATE_PROBES).
683 */
684#undef LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY
685#ifdef LTTNG_UST_TRACEPOINT_PROVIDER_HIDDEN_DEFINITION
686#define LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY __attribute__((visibility("hidden")))
687#else
688#define LTTNG_UST__TRACEPOINT_PROVIDER_DEFINITION_VISIBILITY __attribute__((visibility("default")))
689#endif
690
691#ifndef LTTNG_UST_TRACEPOINT_ENUM
692
693/*
694 * Tracepoint Enumerations
695 *
696 * The enumeration is a mapping between an integer, or range of integers, and
697 * a string. It can be used to have a more compact trace in cases where the
698 * possible values for a field are limited:
699 *
700 * An example:
701 *
702 * LTTNG_UST_TRACEPOINT_ENUM(someproject_component, enumname,
703 * LTTNG_UST_TP_ENUM_VALUES(
704 * lttng_ust_field_enum_value("even", 0)
705 * lttng_ust_field_enum_value("uneven", 1)
706 * lttng_ust_field_enum_range("twoto4", 2, 4)
707 * lttng_ust_field_enum_value("five", 5)
708 * )
709 * )
710 *
711 * Where "someproject_component" is the name of the component this enumeration
712 * belongs to and "enumname" identifies this enumeration. Inside the
713 * LTTNG_UST_TP_ENUM_VALUES macro is the actual mapping. Each string value can map
714 * to either a single value with lttng_ust_field_enum_value or a range of values
715 * with lttng_ust_field_enum_range.
716 *
717 * Enumeration ranges may overlap, but the behavior is implementation-defined,
718 * each trace reader will handle overlapping as it wishes.
719 *
720 * That enumeration can then be used in a field inside the TP_FIELD macro using
721 * the following line:
722 *
723 * lttng_ust_field_enum(someproject_component, enumname, enumtype, enumfield, enumval)
724 *
725 * Where "someproject_component" and "enumname" match those in the
726 * LTTNG_UST_TRACEPOINT_ENUM, "enumtype" is a signed or unsigned integer type
727 * backing the enumeration, "enumfield" is the name of the field and
728 * "enumval" is the value.
729 */
730
731#define LTTNG_UST_TRACEPOINT_ENUM(provider, name, values)
732
733#if LTTNG_UST_COMPAT_API(0)
734#define TRACEPOINT_ENUM LTTNG_UST_TRACEPOINT_ENUM
735#endif /* #if LTTNG_UST_COMPAT_API(0) */
736
737#endif /* #ifndef LTTNG_UST_TRACEPOINT_ENUM */
738
739#ifndef LTTNG_UST_TRACEPOINT_EVENT
740
741/*
742 * How to use the LTTNG_UST_TRACEPOINT_EVENT macro:
743 *
744 * An example:
745 *
746 * LTTNG_UST_TRACEPOINT_EVENT(someproject_component, event_name,
747 *
748 * * LTTNG_UST_TP_ARGS takes from 0 to 10 "type, field_name" pairs *
749 *
750 * LTTNG_UST_TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen,
751 * long *, arg4, size_t, arg4_len),
752 *
753 * * LTTNG_UST_TP_FIELDS describes the event payload layout in the trace *
754 *
755 * LTTNG_UST_TP_FIELDS(
756 * * Integer, printed in base 10 *
757 * lttng_ust_field_integer(int, field_a, arg0)
758 *
759 * * Integer, printed with 0x base 16 *
760 * lttng_ust_field_integer_hex(unsigned long, field_d, arg1)
761 *
762 * * Enumeration *
763 * lttng_ust_field_enum(someproject_component, enum_name, int, field_e, arg0)
764 *
765 * * Array Sequence, printed as UTF8-encoded array of bytes *
766 * lttng_ust_field_array_text(char, field_b, string, FIXED_LEN)
767 * lttng_ust_field_sequence_text(char, field_c, string, size_t, strlen)
768 *
769 * * String, printed as UTF8-encoded string *
770 * lttng_ust_field_string(field_e, string)
771 *
772 * * Array sequence of signed integer values *
773 * lttng_ust_field_array(long, field_f, arg4, FIXED_LEN4)
774 * lttng_ust_field_sequence(long, field_g, arg4, size_t, arg4_len)
775 * )
776 * )
777 *
778 * More detailed explanation:
779 *
780 * The name of the tracepoint is expressed as a tuple with the provider
781 * and name arguments.
782 *
783 * The provider and name should be a proper C99 identifier.
784 * The "provider" and "name" MUST follow these rules to ensure no
785 * namespace clash occurs:
786 *
787 * For projects (applications and libraries) for which an entity
788 * specific to the project controls the source code and thus its
789 * tracepoints (typically with a scope larger than a single company):
790 *
791 * either:
792 * project_component, event
793 * or:
794 * project, event
795 *
796 * Where "project" is the name of the project,
797 * "component" is the name of the project component (which may
798 * include several levels of sub-components, e.g.
799 * ...component_subcomponent_...) where the tracepoint is located
800 * (optional),
801 * "event" is the name of the tracepoint event.
802 *
803 * For projects issued from a single company wishing to advertise that
804 * the company controls the source code and thus the tracepoints, the
805 * "com_" prefix should be used:
806 *
807 * either:
808 * com_company_project_component, event
809 * or:
810 * com_company_project, event
811 *
812 * Where "company" is the name of the company,
813 * "project" is the name of the project,
814 * "component" is the name of the project component (which may
815 * include several levels of sub-components, e.g.
816 * ...component_subcomponent_...) where the tracepoint is located
817 * (optional),
818 * "event" is the name of the tracepoint event.
819 *
820 * the provider:event identifier is limited to 127 characters.
821 */
822
823#define LTTNG_UST_TRACEPOINT_EVENT(provider, name, args, fields) \
824 LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
825 LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
826
827#define LTTNG_UST_TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
828
829#define LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(template_provider, template_name, provider, name, args) \
830 LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
831 LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
832
833#if LTTNG_UST_COMPAT_API(0)
834#define TRACEPOINT_EVENT LTTNG_UST_TRACEPOINT_EVENT
835#define TRACEPOINT_EVENT_CLASS LTTNG_UST_TRACEPOINT_EVENT_CLASS
836#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, args) \
837 LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(_provider, _template, \
838 _provider, _name, LTTNG_UST__TP_PARAMS(args))
839
840#endif /* #if LTTNG_UST_COMPAT_API(0) */
841
842#endif /* #ifndef LTTNG_UST_TRACEPOINT_EVENT */
843
844#ifndef LTTNG_UST_TRACEPOINT_LOGLEVEL
845
846/*
847 * Tracepoint Loglevels
848 *
849 * Typical use of these loglevels:
850 *
851 * The loglevels go from 0 to 14. Higher numbers imply the most
852 * verbosity (higher event throughput expected.
853 *
854 * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels
855 * semantic. Loglevels 7 through 13 offer more fine-grained selection of
856 * debug information.
857 *
858 * LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG 0
859 * system is unusable
860 *
861 * LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT 1
862 * action must be taken immediately
863 *
864 * LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT 2
865 * critical conditions
866 *
867 * LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR 3
868 * error conditions
869 *
870 * LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING 4
871 * warning conditions
872 *
873 * LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE 5
874 * normal, but significant, condition
875 *
876 * LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO 6
877 * informational message
878 *
879 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM 7
880 * debug information with system-level scope (set of programs)
881 *
882 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM 8
883 * debug information with program-level scope (set of processes)
884 *
885 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS 9
886 * debug information with process-level scope (set of modules)
887 *
888 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE 10
889 * debug information with module (executable/library) scope (set of units)
890 *
891 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT 11
892 * debug information with compilation unit scope (set of functions)
893 *
894 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION 12
895 * debug information with function-level scope
896 *
897 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE 13
898 * debug information with line-level scope (LTTNG_UST_TRACEPOINT_EVENT default)
899 *
900 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG 14
901 * debug-level message
902 *
903 * Declare tracepoint loglevels for tracepoints. A LTTNG_UST_TRACEPOINT_EVENT
904 * should be declared prior to the the LTTNG_UST_TRACEPOINT_LOGLEVEL for a given
905 * tracepoint name. The first field is the provider name, the second
906 * field is the name of the tracepoint, the third field is the loglevel
907 * name.
908 *
909 * LTTNG_UST_TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >,
910 * < loglevel_name >)
911 *
912 * The LTTNG_UST_TRACEPOINT_PROVIDER must be already declared before declaring a
913 * LTTNG_UST_TRACEPOINT_LOGLEVEL.
914 */
915
916enum {
917 LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG = 0,
918 LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT = 1,
919 LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT = 2,
920 LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR = 3,
921 LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING = 4,
922 LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE = 5,
923 LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO = 6,
924 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM = 7,
925 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM = 8,
926 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS = 9,
927 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE = 10,
928 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT = 11,
929 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION = 12,
930 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE = 13,
931 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG = 14,
932};
933
934#define LTTNG_UST_TRACEPOINT_LOGLEVEL(provider, name, loglevel)
935
936#if LTTNG_UST_COMPAT_API(0)
937#define TRACEPOINT_LOGLEVEL LTTNG_UST_TRACEPOINT_LOGLEVEL
938
939#define TRACE_EMERG LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG
940#define TRACE_ALERT LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT
941#define TRACE_CRIT LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT
942#define TRACE_ERR LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR
943#define TRACE_WARNING LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING
944#define TRACE_NOTICE LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE
945#define TRACE_INFO LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO
946#define TRACE_DEBUG_SYSTEM LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM
947#define TRACE_DEBUG_PROGRAM LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM
948#define TRACE_DEBUG_PROCESS LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS
949#define TRACE_DEBUG_MODULE LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE
950#define TRACE_DEBUG_UNIT LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT
951#define TRACE_DEBUG_FUNCTION LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION
952#define TRACE_DEBUG_LINE LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE
953#define TRACE_DEBUG LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG
954#endif
955
956#endif /* #ifndef LTTNG_UST_TRACEPOINT_LOGLEVEL */
957
958#ifndef LTTNG_UST_TRACEPOINT_MODEL_EMF_URI
959
960#define LTTNG_UST_TRACEPOINT_MODEL_EMF_URI(provider, name, uri)
961
962#if LTTNG_UST_COMPAT_API(0)
963#define TRACEPOINT_MODEL_EMF_URI LTTNG_UST_TRACEPOINT_MODEL_EMF_URI
964#endif
965
966#endif /* #ifndef LTTNG_UST_TRACEPOINT_MODEL_EMF_URI */
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