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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. | |
d2428e87 MD |
16 | * |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
23 | * SOFTWARE. | |
b728d87e MD |
24 | */ |
25 | ||
8fce9e2b | 26 | #include <lttng/tracepoint-types.h> |
40b2b5a4 | 27 | #include <lttng/tracepoint-rcu.h> |
b728d87e | 28 | #include <urcu/compiler.h> |
deb6e540 | 29 | #include <dlfcn.h> /* for dlopen */ |
51920067 | 30 | #include <string.h> /* for memset */ |
40b2b5a4 | 31 | #include <assert.h> |
b2f60c79 | 32 | #include <lttng/ust-config.h> /* for sdt */ |
a8909ba5 | 33 | #include <lttng/ust-compiler.h> |
b2f60c79 MD |
34 | |
35 | #ifdef LTTNG_UST_HAVE_SDT_INTEGRATION | |
36 | #define SDT_USE_VARIADIC | |
37 | #include <sys/sdt.h> | |
38 | #else | |
39 | #define STAP_PROBEV(...) | |
40 | #endif | |
b728d87e MD |
41 | |
42 | #ifdef __cplusplus | |
43 | extern "C" { | |
44 | #endif | |
45 | ||
23c8854a MD |
46 | #define tracepoint(provider, name, ...) \ |
47 | do { \ | |
7cb85a18 | 48 | STAP_PROBEV(provider, name, ## __VA_ARGS__); \ |
23c8854a MD |
49 | if (caa_unlikely(__tracepoint_##provider##___##name.state)) \ |
50 | __tracepoint_cb_##provider##___##name(__VA_ARGS__); \ | |
b728d87e MD |
51 | } while (0) |
52 | ||
53 | #define TP_ARGS(...) __VA_ARGS__ | |
54 | ||
55 | /* | |
56 | * TP_ARGS takes tuples of type, argument separated by a comma. | |
57 | * It can take up to 10 tuples (which means that less than 10 tuples is | |
58 | * fine too). | |
59 | * Each tuple is also separated by a comma. | |
60 | */ | |
df854e41 MD |
61 | #define __TP_COMBINE_TOKENS(_tokena, _tokenb) \ |
62 | _tokena##_tokenb | |
63 | #define _TP_COMBINE_TOKENS(_tokena, _tokenb) \ | |
64 | __TP_COMBINE_TOKENS(_tokena, _tokenb) | |
65 | #define __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \ | |
66 | _tokena##_tokenb##_tokenc | |
67 | #define _TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \ | |
68 | __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) | |
69 | #define __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \ | |
70 | _tokena##_tokenb##_tokenc##_tokend | |
71 | #define _TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \ | |
72 | __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) | |
b728d87e | 73 | |
4495dd39 MD |
74 | /* |
75 | * _TP_EXVAR* extract the var names. | |
76 | * _TP_EXVAR1 and _TP_EXDATA_VAR1 are needed for -std=c99. | |
77 | */ | |
b728d87e | 78 | #define _TP_EXVAR0() |
4495dd39 | 79 | #define _TP_EXVAR1(a) |
b728d87e MD |
80 | #define _TP_EXVAR2(a,b) b |
81 | #define _TP_EXVAR4(a,b,c,d) b,d | |
82 | #define _TP_EXVAR6(a,b,c,d,e,f) b,d,f | |
83 | #define _TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h | |
84 | #define _TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j | |
85 | #define _TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l | |
86 | #define _TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n | |
87 | #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 | |
88 | #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 | |
89 | #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 | |
90 | ||
91 | #define _TP_EXDATA_VAR0() __tp_data | |
4495dd39 | 92 | #define _TP_EXDATA_VAR1(a) __tp_data |
b728d87e MD |
93 | #define _TP_EXDATA_VAR2(a,b) __tp_data,b |
94 | #define _TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d | |
95 | #define _TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f | |
96 | #define _TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h | |
97 | #define _TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j | |
98 | #define _TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l | |
99 | #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 | |
100 | #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 | |
101 | #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 | |
102 | #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 | |
103 | ||
4495dd39 MD |
104 | /* |
105 | * _TP_EXPROTO* extract tuples of type, var. | |
106 | * _TP_EXPROTO1 and _TP_EXDATA_PROTO1 are needed for -std=c99. | |
107 | */ | |
86637aa6 | 108 | #define _TP_EXPROTO0() void |
4495dd39 | 109 | #define _TP_EXPROTO1(a) void |
b728d87e MD |
110 | #define _TP_EXPROTO2(a,b) a b |
111 | #define _TP_EXPROTO4(a,b,c,d) a b,c d | |
112 | #define _TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f | |
113 | #define _TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h | |
114 | #define _TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j | |
115 | #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 | |
116 | #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 | |
117 | #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 | |
118 | #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 | |
119 | #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 | |
120 | ||
121 | #define _TP_EXDATA_PROTO0() void *__tp_data | |
4495dd39 | 122 | #define _TP_EXDATA_PROTO1(a) void *__tp_data |
b728d87e MD |
123 | #define _TP_EXDATA_PROTO2(a,b) void *__tp_data,a b |
124 | #define _TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d | |
125 | #define _TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f | |
126 | #define _TP_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h | |
127 | #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 | |
128 | #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 | |
129 | #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 | |
130 | #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 | |
131 | #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 | |
132 | #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 | |
133 | ||
134 | /* Preprocessor trick to count arguments. Inspired from sdt.h. */ | |
135 | #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) | |
136 | #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 |
137 | #define _TP_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXPROTO, N)(__VA_ARGS__)) |
138 | #define _TP_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXVAR, N)(__VA_ARGS__)) | |
139 | #define _TP_DATA_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_PROTO, N)(__VA_ARGS__)) | |
140 | #define _TP_DATA_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_VAR, N)(__VA_ARGS__)) | |
b728d87e | 141 | #define _TP_ARGS_PROTO(...) _TP_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
23c8854a | 142 | #define _TP_ARGS_VAR(...) _TP_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
b728d87e | 143 | #define _TP_ARGS_DATA_PROTO(...) _TP_DATA_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
23c8854a | 144 | #define _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
b728d87e MD |
145 | #define _TP_PARAMS(...) __VA_ARGS__ |
146 | ||
0f2f7e21 MD |
147 | #define _DECLARE_TRACEPOINT(_provider, _name, ...) \ |
148 | extern struct tracepoint __tracepoint_##_provider##___##_name; \ | |
a8909ba5 PW |
149 | static inline lttng_ust_notrace \ |
150 | void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)); \ | |
151 | static inline \ | |
152 | void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \ | |
b728d87e MD |
153 | { \ |
154 | struct tracepoint_probe *__tp_probe; \ | |
155 | \ | |
d3db6a40 | 156 | if (caa_unlikely(!TP_RCU_LINK_TEST())) \ |
deb6e540 | 157 | return; \ |
40b2b5a4 | 158 | tp_rcu_read_lock_bp(); \ |
0f2f7e21 | 159 | __tp_probe = tp_rcu_dereference_bp(__tracepoint_##_provider##___##_name.probes); \ |
23c8854a | 160 | if (caa_unlikely(!__tp_probe)) \ |
b728d87e MD |
161 | goto end; \ |
162 | do { \ | |
fbdeb5ec | 163 | void (*__tp_cb)(void) = __tp_probe->func; \ |
23c8854a | 164 | void *__tp_data = __tp_probe->data; \ |
b728d87e | 165 | \ |
23c8854a MD |
166 | URCU_FORCE_CAST(void (*)(_TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \ |
167 | (_TP_ARGS_DATA_VAR(__VA_ARGS__)); \ | |
168 | } while ((++__tp_probe)->func); \ | |
b728d87e | 169 | end: \ |
40b2b5a4 | 170 | tp_rcu_read_unlock_bp(); \ |
b728d87e | 171 | } \ |
a8909ba5 PW |
172 | static inline lttng_ust_notrace \ |
173 | void __tracepoint_register_##_provider##___##_name(char *name, \ | |
174 | void (*func)(void), void *data); \ | |
175 | static inline \ | |
176 | void __tracepoint_register_##_provider##___##_name(char *name, \ | |
177 | void (*func)(void), void *data) \ | |
b728d87e | 178 | { \ |
67e5f391 MD |
179 | __tracepoint_probe_register(name, func, data, \ |
180 | __tracepoint_##_provider##___##_name.signature); \ | |
b728d87e | 181 | } \ |
a8909ba5 PW |
182 | static inline lttng_ust_notrace \ |
183 | void __tracepoint_unregister_##_provider##___##_name(char *name, \ | |
184 | void (*func)(void), void *data); \ | |
185 | static inline \ | |
186 | void __tracepoint_unregister_##_provider##___##_name(char *name, \ | |
187 | void (*func)(void), void *data) \ | |
b728d87e | 188 | { \ |
23c8854a | 189 | __tracepoint_probe_unregister(name, func, data); \ |
b728d87e MD |
190 | } |
191 | ||
fbdeb5ec MD |
192 | extern int __tracepoint_probe_register(const char *name, void (*func)(void), |
193 | void *data, const char *signature); | |
194 | extern int __tracepoint_probe_unregister(const char *name, void (*func)(void), | |
195 | void *data); | |
deb6e540 | 196 | |
51920067 MD |
197 | /* |
198 | * tracepoint dynamic linkage handling (callbacks). Hidden visibility: | |
199 | * shared across objects in a module/main executable. | |
200 | */ | |
201 | struct tracepoint_dlopen { | |
202 | void *liblttngust_handle; | |
203 | ||
204 | int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start, | |
205 | int tracepoints_count); | |
206 | int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start); | |
207 | #ifndef _LGPL_SOURCE | |
208 | void (*rcu_read_lock_sym_bp)(void); | |
209 | void (*rcu_read_unlock_sym_bp)(void); | |
210 | void *(*rcu_dereference_sym_bp)(void *p); | |
211 | #endif | |
212 | }; | |
213 | ||
214 | extern struct tracepoint_dlopen tracepoint_dlopen; | |
215 | ||
46c881a7 MD |
216 | #if defined(TRACEPOINT_DEFINE) || defined(TRACEPOINT_CREATE_PROBES) |
217 | ||
218 | /* | |
219 | * These weak symbols, the constructor, and destructor take care of | |
220 | * registering only _one_ instance of the tracepoints per shared-ojbect | |
221 | * (or for the whole main program). | |
222 | */ | |
223 | int __tracepoint_registered | |
224 | __attribute__((weak, visibility("hidden"))); | |
225 | int __tracepoint_ptrs_registered | |
226 | __attribute__((weak, visibility("hidden"))); | |
227 | struct tracepoint_dlopen tracepoint_dlopen | |
228 | __attribute__((weak, visibility("hidden"))); | |
229 | ||
230 | static void lttng_ust_notrace __attribute__((constructor)) | |
231 | __tracepoints__init(void); | |
232 | static void | |
233 | __tracepoints__init(void) | |
234 | { | |
235 | if (__tracepoint_registered++) | |
236 | return; | |
237 | ||
238 | if (!tracepoint_dlopen.liblttngust_handle) | |
239 | tracepoint_dlopen.liblttngust_handle = | |
240 | dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL); | |
241 | if (!tracepoint_dlopen.liblttngust_handle) | |
242 | return; | |
243 | tracepoint_dlopen.tracepoint_register_lib = | |
244 | URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int), | |
245 | dlsym(tracepoint_dlopen.liblttngust_handle, | |
246 | "tracepoint_register_lib")); | |
247 | tracepoint_dlopen.tracepoint_unregister_lib = | |
248 | URCU_FORCE_CAST(int (*)(struct tracepoint * const *), | |
249 | dlsym(tracepoint_dlopen.liblttngust_handle, | |
250 | "tracepoint_unregister_lib")); | |
251 | #ifndef _LGPL_SOURCE | |
252 | tracepoint_dlopen.rcu_read_lock_sym_bp = | |
253 | URCU_FORCE_CAST(void (*)(void), | |
254 | dlsym(tracepoint_dlopen.liblttngust_handle, | |
255 | "tp_rcu_read_lock_bp")); | |
256 | tracepoint_dlopen.rcu_read_unlock_sym_bp = | |
257 | URCU_FORCE_CAST(void (*)(void), | |
258 | dlsym(tracepoint_dlopen.liblttngust_handle, | |
259 | "tp_rcu_read_unlock_bp")); | |
260 | tracepoint_dlopen.rcu_dereference_sym_bp = | |
261 | URCU_FORCE_CAST(void *(*)(void *p), | |
262 | dlsym(tracepoint_dlopen.liblttngust_handle, | |
263 | "tp_rcu_dereference_sym_bp")); | |
264 | #endif | |
265 | } | |
266 | ||
267 | static void lttng_ust_notrace __attribute__((destructor)) | |
268 | __tracepoints__destroy(void); | |
269 | static void | |
270 | __tracepoints__destroy(void) | |
271 | { | |
272 | int ret; | |
273 | ||
274 | if (--__tracepoint_registered) | |
275 | return; | |
276 | if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_ptrs_registered) { | |
277 | ret = dlclose(tracepoint_dlopen.liblttngust_handle); | |
278 | assert(!ret); | |
279 | memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen)); | |
280 | } | |
281 | } | |
282 | ||
283 | #endif | |
284 | ||
deb6e540 MD |
285 | #ifdef TRACEPOINT_DEFINE |
286 | ||
558b9d86 MD |
287 | /* |
288 | * These weak symbols, the constructor, and destructor take care of | |
289 | * registering only _one_ instance of the tracepoints per shared-ojbect | |
290 | * (or for the whole main program). | |
291 | */ | |
292 | extern struct tracepoint * const __start___tracepoints_ptrs[] | |
293 | __attribute__((weak, visibility("hidden"))); | |
294 | extern struct tracepoint * const __stop___tracepoints_ptrs[] | |
295 | __attribute__((weak, visibility("hidden"))); | |
296 | ||
628e1d81 MD |
297 | /* |
298 | * When TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a | |
299 | * unresolved symbol that requires the provider to be linked in. When | |
300 | * TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an | |
301 | * unresolved symbol that depends on having the provider linked in, | |
302 | * otherwise the linker complains. This deals with use of static | |
303 | * libraries, ensuring that the linker does not remove the provider | |
304 | * object from the executable. | |
305 | */ | |
306 | #ifdef TRACEPOINT_PROBE_DYNAMIC_LINKAGE | |
b4f3bc52 | 307 | #define _TRACEPOINT_UNDEFINED_REF(provider) NULL |
628e1d81 | 308 | #else /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */ |
b4f3bc52 | 309 | #define _TRACEPOINT_UNDEFINED_REF(provider) &__tracepoint_provider_##provider |
628e1d81 MD |
310 | #endif /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */ |
311 | ||
b728d87e MD |
312 | /* |
313 | * Note: to allow PIC code, we need to allow the linker to update the pointers | |
314 | * in the __tracepoints_ptrs section. | |
315 | * Therefore, this section is _not_ const (read-only). | |
316 | */ | |
b4f3bc52 MD |
317 | #define _TP_EXTRACT_STRING(...) #__VA_ARGS__ |
318 | ||
319 | #define _DEFINE_TRACEPOINT(_provider, _name, _args) \ | |
320 | extern int __tracepoint_provider_##_provider; \ | |
321 | static const char __tp_strtab_##_provider##___##_name[] \ | |
b728d87e | 322 | __attribute__((section("__tracepoints_strings"))) = \ |
b4f3bc52 MD |
323 | #_provider ":" #_name; \ |
324 | struct tracepoint __tracepoint_##_provider##___##_name \ | |
b728d87e | 325 | __attribute__((section("__tracepoints"))) = \ |
b4f3bc52 MD |
326 | { \ |
327 | __tp_strtab_##_provider##___##_name, \ | |
328 | 0, \ | |
329 | NULL, \ | |
330 | _TRACEPOINT_UNDEFINED_REF(_provider), \ | |
331 | _TP_EXTRACT_STRING(_args), \ | |
332 | }; \ | |
333 | static struct tracepoint * __tracepoint_ptr_##_provider##___##_name \ | |
b728d87e | 334 | __attribute__((used, section("__tracepoints_ptrs"))) = \ |
b4f3bc52 | 335 | &__tracepoint_##_provider##___##_name; |
b728d87e | 336 | |
a8909ba5 | 337 | static void lttng_ust_notrace __attribute__((constructor)) |
46c881a7 | 338 | __tracepoints__ptrs_init(void); |
a8909ba5 | 339 | static void |
46c881a7 | 340 | __tracepoints__ptrs_init(void) |
b728d87e | 341 | { |
46c881a7 | 342 | if (__tracepoint_ptrs_registered++) |
b728d87e | 343 | return; |
46c881a7 MD |
344 | if (!tracepoint_dlopen.liblttngust_handle) |
345 | tracepoint_dlopen.liblttngust_handle = | |
346 | dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL); | |
51920067 | 347 | if (!tracepoint_dlopen.liblttngust_handle) |
deb6e540 | 348 | return; |
46c881a7 MD |
349 | tracepoint_dlopen.tracepoint_register_lib(__start___tracepoints_ptrs, |
350 | __stop___tracepoints_ptrs - | |
351 | __start___tracepoints_ptrs); | |
b728d87e MD |
352 | } |
353 | ||
a8909ba5 | 354 | static void lttng_ust_notrace __attribute__((destructor)) |
46c881a7 | 355 | __tracepoints__ptrs_destroy(void); |
a8909ba5 | 356 | static void |
46c881a7 | 357 | __tracepoints__ptrs_destroy(void) |
b728d87e | 358 | { |
deb6e540 | 359 | int ret; |
51920067 | 360 | |
46c881a7 | 361 | if (--__tracepoint_ptrs_registered) |
b728d87e | 362 | return; |
46c881a7 MD |
363 | if (tracepoint_dlopen.tracepoint_unregister_lib) |
364 | tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs); | |
365 | if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_registered) { | |
51920067 | 366 | ret = dlclose(tracepoint_dlopen.liblttngust_handle); |
deb6e540 | 367 | assert(!ret); |
51920067 | 368 | memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen)); |
deb6e540 | 369 | } |
b728d87e MD |
370 | } |
371 | ||
46c881a7 MD |
372 | #else /* TRACEPOINT_DEFINE */ |
373 | ||
374 | #define _DEFINE_TRACEPOINT(_provider, _name, _args) | |
375 | ||
376 | #endif /* #else TRACEPOINT_DEFINE */ | |
deb6e540 | 377 | |
b728d87e MD |
378 | #ifdef __cplusplus |
379 | } | |
380 | #endif | |
381 | ||
382 | #endif /* _LTTNG_TRACEPOINT_H */ | |
383 | ||
384 | /* The following declarations must be outside re-inclusion protection. */ | |
385 | ||
386 | #ifndef TRACEPOINT_EVENT | |
387 | ||
388 | /* | |
389 | * How to use the TRACEPOINT_EVENT macro: | |
390 | * | |
391 | * An example: | |
392 | * | |
393 | * TRACEPOINT_EVENT(someproject_component, event_name, | |
394 | * | |
395 | * * TP_ARGS takes from 0 to 10 "type, field_name" pairs * | |
396 | * | |
397 | * TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen, | |
398 | * long *, arg4, size_t, arg4_len), | |
399 | * | |
400 | * * TP_FIELDS describes the event payload layout in the trace * | |
401 | * | |
402 | * TP_FIELDS( | |
403 | * * Integer, printed in base 10 * | |
404 | * ctf_integer(int, field_a, arg0) | |
405 | * | |
406 | * * Integer, printed with 0x base 16 * | |
407 | * ctf_integer_hex(unsigned long, field_d, arg1) | |
408 | * | |
409 | * * Array Sequence, printed as UTF8-encoded array of bytes * | |
410 | * ctf_array_text(char, field_b, string, FIXED_LEN) | |
411 | * ctf_sequence_text(char, field_c, string, size_t, strlen) | |
412 | * | |
413 | * * String, printed as UTF8-encoded string * | |
414 | * ctf_string(field_e, string) | |
415 | * | |
416 | * * Array sequence of signed integer values * | |
417 | * ctf_array(long, field_f, arg4, FIXED_LEN4) | |
418 | * ctf_sequence(long, field_g, arg4, size_t, arg4_len) | |
419 | * ) | |
420 | * ) | |
421 | * | |
422 | * More detailed explanation: | |
423 | * | |
424 | * The name of the tracepoint is expressed as a tuple with the provider | |
425 | * and name arguments. | |
426 | * | |
427 | * The provider and name should be a proper C99 identifier. | |
428 | * The "provider" and "name" MUST follow these rules to ensure no | |
429 | * namespace clash occurs: | |
430 | * | |
431 | * For projects (applications and libraries) for which an entity | |
432 | * specific to the project controls the source code and thus its | |
433 | * tracepoints (typically with a scope larger than a single company): | |
434 | * | |
435 | * either: | |
436 | * project_component, event | |
437 | * or: | |
438 | * project, event | |
439 | * | |
440 | * Where "project" is the name of the project, | |
441 | * "component" is the name of the project component (which may | |
442 | * include several levels of sub-components, e.g. | |
443 | * ...component_subcomponent_...) where the tracepoint is located | |
444 | * (optional), | |
445 | * "event" is the name of the tracepoint event. | |
446 | * | |
447 | * For projects issued from a single company wishing to advertise that | |
448 | * the company controls the source code and thus the tracepoints, the | |
449 | * "com_" prefix should be used: | |
450 | * | |
451 | * either: | |
452 | * com_company_project_component, event | |
453 | * or: | |
454 | * com_company_project, event | |
455 | * | |
456 | * Where "company" is the name of the company, | |
457 | * "project" is the name of the project, | |
458 | * "component" is the name of the project component (which may | |
459 | * include several levels of sub-components, e.g. | |
460 | * ...component_subcomponent_...) where the tracepoint is located | |
461 | * (optional), | |
462 | * "event" is the name of the tracepoint event. | |
463 | * | |
464 | * the provider:event identifier is limited to 127 characters. | |
465 | */ | |
466 | ||
b728d87e | 467 | #define TRACEPOINT_EVENT(provider, name, args, fields) \ |
deb6e540 | 468 | _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \ |
b4f3bc52 | 469 | _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args)) |
b728d87e MD |
470 | |
471 | #define TRACEPOINT_EVENT_CLASS(provider, name, args, fields) | |
472 | ||
473 | #define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \ | |
deb6e540 | 474 | _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \ |
b4f3bc52 | 475 | _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args)) |
b728d87e MD |
476 | |
477 | #endif /* #ifndef TRACEPOINT_EVENT */ | |
478 | ||
479 | #ifndef TRACEPOINT_LOGLEVEL | |
480 | ||
481 | /* | |
75c5ad79 | 482 | * Tracepoint Loglevels |
b728d87e MD |
483 | * |
484 | * Typical use of these loglevels: | |
485 | * | |
d8de1354 | 486 | * The loglevels go from 0 to 14. Higher numbers imply the most |
75c5ad79 MD |
487 | * verbosity (higher event throughput expected. |
488 | * | |
d8de1354 MD |
489 | * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels |
490 | * semantic. Loglevels 7 through 13 offer more fine-grained selection of | |
491 | * debug information. | |
75c5ad79 | 492 | * |
d8de1354 | 493 | * TRACE_EMERG 0 |
75c5ad79 MD |
494 | * system is unusable |
495 | * | |
d8de1354 | 496 | * TRACE_ALERT 1 |
75c5ad79 MD |
497 | * action must be taken immediately |
498 | * | |
d8de1354 | 499 | * TRACE_CRIT 2 |
75c5ad79 MD |
500 | * critical conditions |
501 | * | |
d8de1354 | 502 | * TRACE_ERR 3 |
75c5ad79 MD |
503 | * error conditions |
504 | * | |
d8de1354 | 505 | * TRACE_WARNING 4 |
75c5ad79 MD |
506 | * warning conditions |
507 | * | |
d8de1354 | 508 | * TRACE_NOTICE 5 |
75c5ad79 MD |
509 | * normal, but significant, condition |
510 | * | |
d8de1354 | 511 | * TRACE_INFO 6 |
75c5ad79 MD |
512 | * informational message |
513 | * | |
d8de1354 MD |
514 | * TRACE_DEBUG_SYSTEM 7 |
515 | * debug information with system-level scope (set of programs) | |
75c5ad79 | 516 | * |
d8de1354 MD |
517 | * TRACE_DEBUG_PROGRAM 8 |
518 | * debug information with program-level scope (set of processes) | |
75c5ad79 | 519 | * |
d8de1354 MD |
520 | * TRACE_DEBUG_PROCESS 9 |
521 | * debug information with process-level scope (set of modules) | |
75c5ad79 | 522 | * |
d8de1354 MD |
523 | * TRACE_DEBUG_MODULE 10 |
524 | * debug information with module (executable/library) scope (set of units) | |
75c5ad79 | 525 | * |
d8de1354 MD |
526 | * TRACE_DEBUG_UNIT 11 |
527 | * debug information with compilation unit scope (set of functions) | |
75c5ad79 | 528 | * |
d8de1354 MD |
529 | * TRACE_DEBUG_FUNCTION 12 |
530 | * debug information with function-level scope | |
75c5ad79 | 531 | * |
d8de1354 MD |
532 | * TRACE_DEBUG_LINE 13 |
533 | * debug information with line-level scope (TRACEPOINT_EVENT default) | |
902e1379 | 534 | * |
d8de1354 | 535 | * TRACE_DEBUG 14 |
902e1379 | 536 | * debug-level message (trace_printf default) |
75c5ad79 MD |
537 | * |
538 | * Declare tracepoint loglevels for tracepoints. A TRACEPOINT_EVENT | |
539 | * should be declared prior to the the TRACEPOINT_LOGLEVEL for a given | |
853cda88 MD |
540 | * tracepoint name. The first field is the provider name, the second |
541 | * field is the name of the tracepoint, the third field is the loglevel | |
542 | * name. | |
b728d87e MD |
543 | * |
544 | * TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >, | |
545 | * < loglevel_name >) | |
546 | * | |
75c5ad79 MD |
547 | * The TRACEPOINT_PROVIDER must be already declared before declaring a |
548 | * TRACEPOINT_LOGLEVEL. | |
b728d87e MD |
549 | */ |
550 | ||
882a56d7 | 551 | enum { |
d8de1354 MD |
552 | TRACE_EMERG = 0, |
553 | TRACE_ALERT = 1, | |
554 | TRACE_CRIT = 2, | |
555 | TRACE_ERR = 3, | |
556 | TRACE_WARNING = 4, | |
557 | TRACE_NOTICE = 5, | |
558 | TRACE_INFO = 6, | |
559 | TRACE_DEBUG_SYSTEM = 7, | |
560 | TRACE_DEBUG_PROGRAM = 8, | |
561 | TRACE_DEBUG_PROCESS = 9, | |
562 | TRACE_DEBUG_MODULE = 10, | |
563 | TRACE_DEBUG_UNIT = 11, | |
564 | TRACE_DEBUG_FUNCTION = 12, | |
565 | TRACE_DEBUG_LINE = 13, | |
566 | TRACE_DEBUG = 14, | |
882a56d7 MD |
567 | }; |
568 | ||
05ceaafd | 569 | #define TRACEPOINT_LOGLEVEL(provider, name, loglevel) |
b728d87e MD |
570 | |
571 | #endif /* #ifndef TRACEPOINT_LOGLEVEL */ | |
6ddc916d MD |
572 | |
573 | #ifndef TRACEPOINT_MODEL_EMF_URI | |
574 | ||
575 | #define TRACEPOINT_MODEL_EMF_URI(provider, name, uri) | |
576 | ||
577 | #endif /* #ifndef TRACEPOINT_MODEL_EMF_URI */ |