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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. | |
b728d87e MD |
16 | */ |
17 | ||
8fce9e2b | 18 | #include <lttng/tracepoint-types.h> |
40b2b5a4 | 19 | #include <lttng/tracepoint-rcu.h> |
b728d87e | 20 | #include <urcu/compiler.h> |
deb6e540 | 21 | #include <dlfcn.h> /* for dlopen */ |
51920067 | 22 | #include <string.h> /* for memset */ |
40b2b5a4 | 23 | #include <assert.h> |
b2f60c79 | 24 | #include <lttng/ust-config.h> /* for sdt */ |
a8909ba5 | 25 | #include <lttng/ust-compiler.h> |
b2f60c79 MD |
26 | |
27 | #ifdef LTTNG_UST_HAVE_SDT_INTEGRATION | |
28 | #define SDT_USE_VARIADIC | |
29 | #include <sys/sdt.h> | |
30 | #else | |
31 | #define STAP_PROBEV(...) | |
32 | #endif | |
b728d87e MD |
33 | |
34 | #ifdef __cplusplus | |
35 | extern "C" { | |
36 | #endif | |
37 | ||
23c8854a MD |
38 | #define tracepoint(provider, name, ...) \ |
39 | do { \ | |
7cb85a18 | 40 | STAP_PROBEV(provider, name, ## __VA_ARGS__); \ |
23c8854a MD |
41 | if (caa_unlikely(__tracepoint_##provider##___##name.state)) \ |
42 | __tracepoint_cb_##provider##___##name(__VA_ARGS__); \ | |
b728d87e MD |
43 | } while (0) |
44 | ||
45 | #define TP_ARGS(...) __VA_ARGS__ | |
46 | ||
47 | /* | |
48 | * TP_ARGS takes tuples of type, argument separated by a comma. | |
49 | * It can take up to 10 tuples (which means that less than 10 tuples is | |
50 | * fine too). | |
51 | * Each tuple is also separated by a comma. | |
52 | */ | |
df854e41 MD |
53 | #define __TP_COMBINE_TOKENS(_tokena, _tokenb) \ |
54 | _tokena##_tokenb | |
55 | #define _TP_COMBINE_TOKENS(_tokena, _tokenb) \ | |
56 | __TP_COMBINE_TOKENS(_tokena, _tokenb) | |
57 | #define __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \ | |
58 | _tokena##_tokenb##_tokenc | |
59 | #define _TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \ | |
60 | __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) | |
61 | #define __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \ | |
62 | _tokena##_tokenb##_tokenc##_tokend | |
63 | #define _TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \ | |
64 | __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) | |
b728d87e | 65 | |
4495dd39 MD |
66 | /* |
67 | * _TP_EXVAR* extract the var names. | |
68 | * _TP_EXVAR1 and _TP_EXDATA_VAR1 are needed for -std=c99. | |
69 | */ | |
b728d87e | 70 | #define _TP_EXVAR0() |
4495dd39 | 71 | #define _TP_EXVAR1(a) |
b728d87e MD |
72 | #define _TP_EXVAR2(a,b) b |
73 | #define _TP_EXVAR4(a,b,c,d) b,d | |
74 | #define _TP_EXVAR6(a,b,c,d,e,f) b,d,f | |
75 | #define _TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h | |
76 | #define _TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j | |
77 | #define _TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l | |
78 | #define _TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n | |
79 | #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 | |
80 | #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 | |
81 | #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 | |
82 | ||
83 | #define _TP_EXDATA_VAR0() __tp_data | |
4495dd39 | 84 | #define _TP_EXDATA_VAR1(a) __tp_data |
b728d87e MD |
85 | #define _TP_EXDATA_VAR2(a,b) __tp_data,b |
86 | #define _TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d | |
87 | #define _TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f | |
88 | #define _TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h | |
89 | #define _TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j | |
90 | #define _TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l | |
91 | #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 | |
92 | #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 | |
93 | #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 | |
94 | #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 | |
95 | ||
4495dd39 MD |
96 | /* |
97 | * _TP_EXPROTO* extract tuples of type, var. | |
98 | * _TP_EXPROTO1 and _TP_EXDATA_PROTO1 are needed for -std=c99. | |
99 | */ | |
86637aa6 | 100 | #define _TP_EXPROTO0() void |
4495dd39 | 101 | #define _TP_EXPROTO1(a) void |
b728d87e MD |
102 | #define _TP_EXPROTO2(a,b) a b |
103 | #define _TP_EXPROTO4(a,b,c,d) a b,c d | |
104 | #define _TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f | |
105 | #define _TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h | |
106 | #define _TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j | |
107 | #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 | |
108 | #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 | |
109 | #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 | |
110 | #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 | |
111 | #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 | |
112 | ||
113 | #define _TP_EXDATA_PROTO0() void *__tp_data | |
4495dd39 | 114 | #define _TP_EXDATA_PROTO1(a) void *__tp_data |
b728d87e MD |
115 | #define _TP_EXDATA_PROTO2(a,b) void *__tp_data,a b |
116 | #define _TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d | |
117 | #define _TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f | |
118 | #define _TP_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h | |
119 | #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 | |
120 | #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 | |
121 | #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 | |
122 | #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 | |
123 | #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 | |
124 | #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 | |
125 | ||
126 | /* Preprocessor trick to count arguments. Inspired from sdt.h. */ | |
127 | #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) | |
128 | #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 |
129 | #define _TP_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXPROTO, N)(__VA_ARGS__)) |
130 | #define _TP_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXVAR, N)(__VA_ARGS__)) | |
131 | #define _TP_DATA_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_PROTO, N)(__VA_ARGS__)) | |
132 | #define _TP_DATA_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_VAR, N)(__VA_ARGS__)) | |
b728d87e | 133 | #define _TP_ARGS_PROTO(...) _TP_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
23c8854a | 134 | #define _TP_ARGS_VAR(...) _TP_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
b728d87e | 135 | #define _TP_ARGS_DATA_PROTO(...) _TP_DATA_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
23c8854a | 136 | #define _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__) |
b728d87e MD |
137 | #define _TP_PARAMS(...) __VA_ARGS__ |
138 | ||
0f2f7e21 MD |
139 | #define _DECLARE_TRACEPOINT(_provider, _name, ...) \ |
140 | extern struct tracepoint __tracepoint_##_provider##___##_name; \ | |
a8909ba5 PW |
141 | static inline lttng_ust_notrace \ |
142 | void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)); \ | |
143 | static inline \ | |
144 | void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \ | |
b728d87e MD |
145 | { \ |
146 | struct tracepoint_probe *__tp_probe; \ | |
147 | \ | |
40b2b5a4 | 148 | if (!TP_RCU_LINK_TEST()) \ |
deb6e540 | 149 | return; \ |
40b2b5a4 | 150 | tp_rcu_read_lock_bp(); \ |
0f2f7e21 | 151 | __tp_probe = tp_rcu_dereference_bp(__tracepoint_##_provider##___##_name.probes); \ |
23c8854a | 152 | if (caa_unlikely(!__tp_probe)) \ |
b728d87e MD |
153 | goto end; \ |
154 | do { \ | |
fbdeb5ec | 155 | void (*__tp_cb)(void) = __tp_probe->func; \ |
23c8854a | 156 | void *__tp_data = __tp_probe->data; \ |
b728d87e | 157 | \ |
23c8854a MD |
158 | URCU_FORCE_CAST(void (*)(_TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \ |
159 | (_TP_ARGS_DATA_VAR(__VA_ARGS__)); \ | |
160 | } while ((++__tp_probe)->func); \ | |
b728d87e | 161 | end: \ |
40b2b5a4 | 162 | tp_rcu_read_unlock_bp(); \ |
b728d87e | 163 | } \ |
a8909ba5 PW |
164 | static inline lttng_ust_notrace \ |
165 | void __tracepoint_register_##_provider##___##_name(char *name, \ | |
166 | void (*func)(void), void *data); \ | |
167 | static inline \ | |
168 | void __tracepoint_register_##_provider##___##_name(char *name, \ | |
169 | void (*func)(void), void *data) \ | |
b728d87e | 170 | { \ |
67e5f391 MD |
171 | __tracepoint_probe_register(name, func, data, \ |
172 | __tracepoint_##_provider##___##_name.signature); \ | |
b728d87e | 173 | } \ |
a8909ba5 PW |
174 | static inline lttng_ust_notrace \ |
175 | void __tracepoint_unregister_##_provider##___##_name(char *name, \ | |
176 | void (*func)(void), void *data); \ | |
177 | static inline \ | |
178 | void __tracepoint_unregister_##_provider##___##_name(char *name, \ | |
179 | void (*func)(void), void *data) \ | |
b728d87e | 180 | { \ |
23c8854a | 181 | __tracepoint_probe_unregister(name, func, data); \ |
b728d87e MD |
182 | } |
183 | ||
fbdeb5ec MD |
184 | extern int __tracepoint_probe_register(const char *name, void (*func)(void), |
185 | void *data, const char *signature); | |
186 | extern int __tracepoint_probe_unregister(const char *name, void (*func)(void), | |
187 | void *data); | |
deb6e540 | 188 | |
51920067 MD |
189 | /* |
190 | * tracepoint dynamic linkage handling (callbacks). Hidden visibility: | |
191 | * shared across objects in a module/main executable. | |
192 | */ | |
193 | struct tracepoint_dlopen { | |
194 | void *liblttngust_handle; | |
195 | ||
196 | int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start, | |
197 | int tracepoints_count); | |
198 | int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start); | |
199 | #ifndef _LGPL_SOURCE | |
200 | void (*rcu_read_lock_sym_bp)(void); | |
201 | void (*rcu_read_unlock_sym_bp)(void); | |
202 | void *(*rcu_dereference_sym_bp)(void *p); | |
203 | #endif | |
204 | }; | |
205 | ||
206 | extern struct tracepoint_dlopen tracepoint_dlopen; | |
207 | ||
deb6e540 MD |
208 | #ifdef TRACEPOINT_DEFINE |
209 | ||
628e1d81 MD |
210 | /* |
211 | * When TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a | |
212 | * unresolved symbol that requires the provider to be linked in. When | |
213 | * TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an | |
214 | * unresolved symbol that depends on having the provider linked in, | |
215 | * otherwise the linker complains. This deals with use of static | |
216 | * libraries, ensuring that the linker does not remove the provider | |
217 | * object from the executable. | |
218 | */ | |
219 | #ifdef TRACEPOINT_PROBE_DYNAMIC_LINKAGE | |
b4f3bc52 | 220 | #define _TRACEPOINT_UNDEFINED_REF(provider) NULL |
628e1d81 | 221 | #else /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */ |
b4f3bc52 | 222 | #define _TRACEPOINT_UNDEFINED_REF(provider) &__tracepoint_provider_##provider |
628e1d81 MD |
223 | #endif /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */ |
224 | ||
b728d87e MD |
225 | /* |
226 | * Note: to allow PIC code, we need to allow the linker to update the pointers | |
227 | * in the __tracepoints_ptrs section. | |
228 | * Therefore, this section is _not_ const (read-only). | |
229 | */ | |
b4f3bc52 MD |
230 | #define _TP_EXTRACT_STRING(...) #__VA_ARGS__ |
231 | ||
232 | #define _DEFINE_TRACEPOINT(_provider, _name, _args) \ | |
233 | extern int __tracepoint_provider_##_provider; \ | |
234 | static const char __tp_strtab_##_provider##___##_name[] \ | |
b728d87e | 235 | __attribute__((section("__tracepoints_strings"))) = \ |
b4f3bc52 MD |
236 | #_provider ":" #_name; \ |
237 | struct tracepoint __tracepoint_##_provider##___##_name \ | |
b728d87e | 238 | __attribute__((section("__tracepoints"))) = \ |
b4f3bc52 MD |
239 | { \ |
240 | __tp_strtab_##_provider##___##_name, \ | |
241 | 0, \ | |
242 | NULL, \ | |
243 | _TRACEPOINT_UNDEFINED_REF(_provider), \ | |
244 | _TP_EXTRACT_STRING(_args), \ | |
245 | }; \ | |
246 | static struct tracepoint * __tracepoint_ptr_##_provider##___##_name \ | |
b728d87e | 247 | __attribute__((used, section("__tracepoints_ptrs"))) = \ |
b4f3bc52 | 248 | &__tracepoint_##_provider##___##_name; |
b728d87e | 249 | |
b728d87e MD |
250 | /* |
251 | * These weak symbols, the constructor, and destructor take care of | |
252 | * registering only _one_ instance of the tracepoints per shared-ojbect | |
253 | * (or for the whole main program). | |
254 | */ | |
255 | extern struct tracepoint * const __start___tracepoints_ptrs[] | |
256 | __attribute__((weak, visibility("hidden"))); | |
257 | extern struct tracepoint * const __stop___tracepoints_ptrs[] | |
258 | __attribute__((weak, visibility("hidden"))); | |
259 | int __tracepoint_registered | |
260 | __attribute__((weak, visibility("hidden"))); | |
51920067 MD |
261 | struct tracepoint_dlopen tracepoint_dlopen |
262 | __attribute__((weak, visibility("hidden"))); | |
b728d87e | 263 | |
a8909ba5 PW |
264 | static void lttng_ust_notrace __attribute__((constructor)) |
265 | __tracepoints__init(void); | |
266 | static void | |
267 | __tracepoints__init(void) | |
b728d87e MD |
268 | { |
269 | if (__tracepoint_registered++) | |
270 | return; | |
deb6e540 | 271 | |
51920067 MD |
272 | tracepoint_dlopen.liblttngust_handle = |
273 | dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL); | |
274 | if (!tracepoint_dlopen.liblttngust_handle) | |
deb6e540 | 275 | return; |
51920067 | 276 | tracepoint_dlopen.tracepoint_register_lib = |
93ffe366 | 277 | URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int), |
51920067 | 278 | dlsym(tracepoint_dlopen.liblttngust_handle, |
93ffe366 | 279 | "tracepoint_register_lib")); |
51920067 | 280 | tracepoint_dlopen.tracepoint_unregister_lib = |
93ffe366 | 281 | URCU_FORCE_CAST(int (*)(struct tracepoint * const *), |
51920067 | 282 | dlsym(tracepoint_dlopen.liblttngust_handle, |
93ffe366 | 283 | "tracepoint_unregister_lib")); |
40b2b5a4 | 284 | #ifndef _LGPL_SOURCE |
51920067 | 285 | tracepoint_dlopen.rcu_read_lock_sym_bp = |
40b2b5a4 | 286 | URCU_FORCE_CAST(void (*)(void), |
51920067 | 287 | dlsym(tracepoint_dlopen.liblttngust_handle, |
40b2b5a4 | 288 | "tp_rcu_read_lock_bp")); |
51920067 | 289 | tracepoint_dlopen.rcu_read_unlock_sym_bp = |
40b2b5a4 | 290 | URCU_FORCE_CAST(void (*)(void), |
51920067 | 291 | dlsym(tracepoint_dlopen.liblttngust_handle, |
40b2b5a4 | 292 | "tp_rcu_read_unlock_bp")); |
51920067 | 293 | tracepoint_dlopen.rcu_dereference_sym_bp = |
40b2b5a4 | 294 | URCU_FORCE_CAST(void *(*)(void *p), |
51920067 | 295 | dlsym(tracepoint_dlopen.liblttngust_handle, |
40b2b5a4 MD |
296 | "tp_rcu_dereference_sym_bp")); |
297 | #endif | |
51920067 | 298 | tracepoint_dlopen.tracepoint_register_lib(__start___tracepoints_ptrs, |
b728d87e MD |
299 | __stop___tracepoints_ptrs - |
300 | __start___tracepoints_ptrs); | |
301 | } | |
302 | ||
a8909ba5 PW |
303 | static void lttng_ust_notrace __attribute__((destructor)) |
304 | __tracepoints__destroy(void); | |
305 | static void | |
306 | __tracepoints__destroy(void) | |
b728d87e | 307 | { |
deb6e540 | 308 | int ret; |
51920067 | 309 | |
b728d87e MD |
310 | if (--__tracepoint_registered) |
311 | return; | |
51920067 MD |
312 | if (tracepoint_dlopen.tracepoint_unregister_lib) |
313 | tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs); | |
314 | if (tracepoint_dlopen.liblttngust_handle) { | |
315 | ret = dlclose(tracepoint_dlopen.liblttngust_handle); | |
deb6e540 | 316 | assert(!ret); |
51920067 | 317 | memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen)); |
deb6e540 | 318 | } |
b728d87e MD |
319 | } |
320 | ||
deb6e540 MD |
321 | #else /* TRACEPOINT_DEFINE */ |
322 | ||
b4f3bc52 | 323 | #define _DEFINE_TRACEPOINT(_provider, _name, _args) |
deb6e540 MD |
324 | |
325 | #endif /* #else TRACEPOINT_DEFINE */ | |
326 | ||
b728d87e MD |
327 | #ifdef __cplusplus |
328 | } | |
329 | #endif | |
330 | ||
331 | #endif /* _LTTNG_TRACEPOINT_H */ | |
332 | ||
333 | /* The following declarations must be outside re-inclusion protection. */ | |
334 | ||
335 | #ifndef TRACEPOINT_EVENT | |
336 | ||
337 | /* | |
338 | * How to use the TRACEPOINT_EVENT macro: | |
339 | * | |
340 | * An example: | |
341 | * | |
342 | * TRACEPOINT_EVENT(someproject_component, event_name, | |
343 | * | |
344 | * * TP_ARGS takes from 0 to 10 "type, field_name" pairs * | |
345 | * | |
346 | * TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen, | |
347 | * long *, arg4, size_t, arg4_len), | |
348 | * | |
349 | * * TP_FIELDS describes the event payload layout in the trace * | |
350 | * | |
351 | * TP_FIELDS( | |
352 | * * Integer, printed in base 10 * | |
353 | * ctf_integer(int, field_a, arg0) | |
354 | * | |
355 | * * Integer, printed with 0x base 16 * | |
356 | * ctf_integer_hex(unsigned long, field_d, arg1) | |
357 | * | |
358 | * * Array Sequence, printed as UTF8-encoded array of bytes * | |
359 | * ctf_array_text(char, field_b, string, FIXED_LEN) | |
360 | * ctf_sequence_text(char, field_c, string, size_t, strlen) | |
361 | * | |
362 | * * String, printed as UTF8-encoded string * | |
363 | * ctf_string(field_e, string) | |
364 | * | |
365 | * * Array sequence of signed integer values * | |
366 | * ctf_array(long, field_f, arg4, FIXED_LEN4) | |
367 | * ctf_sequence(long, field_g, arg4, size_t, arg4_len) | |
368 | * ) | |
369 | * ) | |
370 | * | |
371 | * More detailed explanation: | |
372 | * | |
373 | * The name of the tracepoint is expressed as a tuple with the provider | |
374 | * and name arguments. | |
375 | * | |
376 | * The provider and name should be a proper C99 identifier. | |
377 | * The "provider" and "name" MUST follow these rules to ensure no | |
378 | * namespace clash occurs: | |
379 | * | |
380 | * For projects (applications and libraries) for which an entity | |
381 | * specific to the project controls the source code and thus its | |
382 | * tracepoints (typically with a scope larger than a single company): | |
383 | * | |
384 | * either: | |
385 | * project_component, event | |
386 | * or: | |
387 | * project, event | |
388 | * | |
389 | * Where "project" is the name of the project, | |
390 | * "component" is the name of the project component (which may | |
391 | * include several levels of sub-components, e.g. | |
392 | * ...component_subcomponent_...) where the tracepoint is located | |
393 | * (optional), | |
394 | * "event" is the name of the tracepoint event. | |
395 | * | |
396 | * For projects issued from a single company wishing to advertise that | |
397 | * the company controls the source code and thus the tracepoints, the | |
398 | * "com_" prefix should be used: | |
399 | * | |
400 | * either: | |
401 | * com_company_project_component, event | |
402 | * or: | |
403 | * com_company_project, event | |
404 | * | |
405 | * Where "company" is the name of the company, | |
406 | * "project" is the name of the project, | |
407 | * "component" is the name of the project component (which may | |
408 | * include several levels of sub-components, e.g. | |
409 | * ...component_subcomponent_...) where the tracepoint is located | |
410 | * (optional), | |
411 | * "event" is the name of the tracepoint event. | |
412 | * | |
413 | * the provider:event identifier is limited to 127 characters. | |
414 | */ | |
415 | ||
b728d87e | 416 | #define TRACEPOINT_EVENT(provider, name, args, fields) \ |
deb6e540 | 417 | _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \ |
b4f3bc52 | 418 | _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args)) |
b728d87e MD |
419 | |
420 | #define TRACEPOINT_EVENT_CLASS(provider, name, args, fields) | |
421 | ||
422 | #define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \ | |
deb6e540 | 423 | _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \ |
b4f3bc52 | 424 | _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args)) |
b728d87e MD |
425 | |
426 | #endif /* #ifndef TRACEPOINT_EVENT */ | |
427 | ||
428 | #ifndef TRACEPOINT_LOGLEVEL | |
429 | ||
430 | /* | |
75c5ad79 | 431 | * Tracepoint Loglevels |
b728d87e MD |
432 | * |
433 | * Typical use of these loglevels: | |
434 | * | |
d8de1354 | 435 | * The loglevels go from 0 to 14. Higher numbers imply the most |
75c5ad79 MD |
436 | * verbosity (higher event throughput expected. |
437 | * | |
d8de1354 MD |
438 | * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels |
439 | * semantic. Loglevels 7 through 13 offer more fine-grained selection of | |
440 | * debug information. | |
75c5ad79 | 441 | * |
d8de1354 | 442 | * TRACE_EMERG 0 |
75c5ad79 MD |
443 | * system is unusable |
444 | * | |
d8de1354 | 445 | * TRACE_ALERT 1 |
75c5ad79 MD |
446 | * action must be taken immediately |
447 | * | |
d8de1354 | 448 | * TRACE_CRIT 2 |
75c5ad79 MD |
449 | * critical conditions |
450 | * | |
d8de1354 | 451 | * TRACE_ERR 3 |
75c5ad79 MD |
452 | * error conditions |
453 | * | |
d8de1354 | 454 | * TRACE_WARNING 4 |
75c5ad79 MD |
455 | * warning conditions |
456 | * | |
d8de1354 | 457 | * TRACE_NOTICE 5 |
75c5ad79 MD |
458 | * normal, but significant, condition |
459 | * | |
d8de1354 | 460 | * TRACE_INFO 6 |
75c5ad79 MD |
461 | * informational message |
462 | * | |
d8de1354 MD |
463 | * TRACE_DEBUG_SYSTEM 7 |
464 | * debug information with system-level scope (set of programs) | |
75c5ad79 | 465 | * |
d8de1354 MD |
466 | * TRACE_DEBUG_PROGRAM 8 |
467 | * debug information with program-level scope (set of processes) | |
75c5ad79 | 468 | * |
d8de1354 MD |
469 | * TRACE_DEBUG_PROCESS 9 |
470 | * debug information with process-level scope (set of modules) | |
75c5ad79 | 471 | * |
d8de1354 MD |
472 | * TRACE_DEBUG_MODULE 10 |
473 | * debug information with module (executable/library) scope (set of units) | |
75c5ad79 | 474 | * |
d8de1354 MD |
475 | * TRACE_DEBUG_UNIT 11 |
476 | * debug information with compilation unit scope (set of functions) | |
75c5ad79 | 477 | * |
d8de1354 MD |
478 | * TRACE_DEBUG_FUNCTION 12 |
479 | * debug information with function-level scope | |
75c5ad79 | 480 | * |
d8de1354 MD |
481 | * TRACE_DEBUG_LINE 13 |
482 | * debug information with line-level scope (TRACEPOINT_EVENT default) | |
902e1379 | 483 | * |
d8de1354 | 484 | * TRACE_DEBUG 14 |
902e1379 | 485 | * debug-level message (trace_printf default) |
75c5ad79 MD |
486 | * |
487 | * Declare tracepoint loglevels for tracepoints. A TRACEPOINT_EVENT | |
488 | * should be declared prior to the the TRACEPOINT_LOGLEVEL for a given | |
853cda88 MD |
489 | * tracepoint name. The first field is the provider name, the second |
490 | * field is the name of the tracepoint, the third field is the loglevel | |
491 | * name. | |
b728d87e MD |
492 | * |
493 | * TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >, | |
494 | * < loglevel_name >) | |
495 | * | |
75c5ad79 MD |
496 | * The TRACEPOINT_PROVIDER must be already declared before declaring a |
497 | * TRACEPOINT_LOGLEVEL. | |
b728d87e MD |
498 | */ |
499 | ||
882a56d7 | 500 | enum { |
d8de1354 MD |
501 | TRACE_EMERG = 0, |
502 | TRACE_ALERT = 1, | |
503 | TRACE_CRIT = 2, | |
504 | TRACE_ERR = 3, | |
505 | TRACE_WARNING = 4, | |
506 | TRACE_NOTICE = 5, | |
507 | TRACE_INFO = 6, | |
508 | TRACE_DEBUG_SYSTEM = 7, | |
509 | TRACE_DEBUG_PROGRAM = 8, | |
510 | TRACE_DEBUG_PROCESS = 9, | |
511 | TRACE_DEBUG_MODULE = 10, | |
512 | TRACE_DEBUG_UNIT = 11, | |
513 | TRACE_DEBUG_FUNCTION = 12, | |
514 | TRACE_DEBUG_LINE = 13, | |
515 | TRACE_DEBUG = 14, | |
882a56d7 MD |
516 | }; |
517 | ||
05ceaafd | 518 | #define TRACEPOINT_LOGLEVEL(provider, name, loglevel) |
b728d87e MD |
519 | |
520 | #endif /* #ifndef TRACEPOINT_LOGLEVEL */ | |
6ddc916d MD |
521 | |
522 | #ifndef TRACEPOINT_MODEL_EMF_URI | |
523 | ||
524 | #define TRACEPOINT_MODEL_EMF_URI(provider, name, uri) | |
525 | ||
526 | #endif /* #ifndef TRACEPOINT_MODEL_EMF_URI */ |