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Fix coverity warning about sizeof(void **) != sizeof(void *)
[lttng-ust.git] / include / lttng / ust-tracepoint-event.h
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1/*
2 * Copyright (c) 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23#include <stdio.h>
24#include <stdlib.h>
25#include <urcu/compiler.h>
26#include <urcu/rculist.h>
27#include <lttng/ust-events.h>
28#include <lttng/ringbuffer-config.h>
29#include <lttng/ust-compiler.h>
30#include <lttng/tracepoint.h>
31#include <string.h>
32
33#undef tp_list_for_each_entry_rcu
34#define tp_list_for_each_entry_rcu(pos, head, member) \
35 for (pos = cds_list_entry(tp_rcu_dereference_bp((head)->next), __typeof__(*pos), member); \
36 &pos->member != (head); \
37 pos = cds_list_entry(tp_rcu_dereference_bp(pos->member.next), __typeof__(*pos), member))
38
39/*
40 * TRACEPOINT_EVENT_CLASS declares a class of tracepoints receiving the
41 * same arguments and having the same field layout.
42 *
43 * TRACEPOINT_EVENT_INSTANCE declares an instance of a tracepoint, with
44 * its own provider and name. It refers to a class (template).
45 *
46 * TRACEPOINT_EVENT declared both a class and an instance and does a
47 * direct mapping from the instance to the class.
48 */
49
50#undef TRACEPOINT_EVENT
51#define TRACEPOINT_EVENT(_provider, _name, _args, _fields) \
52 TRACEPOINT_EVENT_CLASS(_provider, _name, \
53 _TP_PARAMS(_args), \
54 _TP_PARAMS(_fields)) \
55 TRACEPOINT_EVENT_INSTANCE(_provider, _name, _name, \
56 _TP_PARAMS(_args))
57
58/* Helpers */
59#define _TP_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
60
61#define _tp_max_t(type, x, y) \
62 ({ \
63 type __max1 = (x); \
64 type __max2 = (y); \
65 __max1 > __max2 ? __max1: __max2; \
66 })
67
68/*
69 * Stage 0 of tracepoint event generation.
70 *
71 * Check that each TRACEPOINT_EVENT provider argument match the
72 * TRACEPOINT_PROVIDER by creating dummy callbacks.
73 */
74
75/* Reset all macros within TRACEPOINT_EVENT */
76#include <lttng/ust-tracepoint-event-reset.h>
77
78static inline lttng_ust_notrace
79void _TP_COMBINE_TOKENS(__tracepoint_provider_mismatch_, TRACEPOINT_PROVIDER)(void);
80static inline
81void _TP_COMBINE_TOKENS(__tracepoint_provider_mismatch_, TRACEPOINT_PROVIDER)(void)
82{
83}
84
85#undef TRACEPOINT_EVENT_CLASS
86#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
87 __tracepoint_provider_mismatch_##_provider();
88
89#undef TRACEPOINT_EVENT_INSTANCE
90#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
91 __tracepoint_provider_mismatch_##_provider();
92
93static inline lttng_ust_notrace
94void _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)(void);
95static inline
96void _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)(void)
97{
98#include TRACEPOINT_INCLUDE
99}
100
101/*
102 * Stage 0.1 of tracepoint event generation.
103 *
104 * Check that each TRACEPOINT_EVENT provider:name does not exceed the
105 * tracepoint name length limit.
106 */
107
108/* Reset all macros within TRACEPOINT_EVENT */
109#include <lttng/ust-tracepoint-event-reset.h>
110
111#undef TRACEPOINT_EVENT_INSTANCE
112#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
113static const char \
114 __tp_name_len_check##_provider##___##_name[LTTNG_UST_SYM_NAME_LEN] \
115 __attribute__((unused)) = \
116 #_provider ":" #_name;
117
118#include TRACEPOINT_INCLUDE
119
120/*
121 * Stage 1 of tracepoint event generation.
122 *
123 * Create event field type metadata section.
124 * Each event produce an array of fields.
125 */
126
127/* Reset all macros within TRACEPOINT_EVENT */
128#include <lttng/ust-tracepoint-event-reset.h>
129#include <lttng/ust-tracepoint-event-write.h>
130#include <lttng/ust-tracepoint-event-nowrite.h>
131
132#undef _ctf_integer_ext
133#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
134 { \
135 .name = #_item, \
136 .type = __type_integer(_type, _byte_order, _base, none),\
137 .nowrite = _nowrite, \
138 },
139
140#undef _ctf_float
141#define _ctf_float(_type, _item, _src, _nowrite) \
142 { \
143 .name = #_item, \
144 .type = __type_float(_type), \
145 .nowrite = _nowrite, \
146 },
147
148#undef _ctf_array_encoded
149#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _nowrite) \
150 { \
151 .name = #_item, \
152 .type = \
153 { \
154 .atype = atype_array, \
155 .u = \
156 { \
157 .array = \
158 { \
159 .elem_type = __type_integer(_type, BYTE_ORDER, 10, _encoding), \
160 .length = _length, \
161 } \
162 } \
163 }, \
164 .nowrite = _nowrite, \
165 },
166
167#undef _ctf_sequence_encoded
168#define _ctf_sequence_encoded(_type, _item, _src, \
169 _length_type, _src_length, _encoding, _nowrite) \
170 { \
171 .name = #_item, \
172 .type = \
173 { \
174 .atype = atype_sequence, \
175 .u = \
176 { \
177 .sequence = \
178 { \
179 .length_type = __type_integer(_length_type, BYTE_ORDER, 10, none), \
180 .elem_type = __type_integer(_type, BYTE_ORDER, 10, _encoding), \
181 }, \
182 }, \
183 }, \
184 .nowrite = _nowrite, \
185 },
186
187#undef _ctf_string
188#define _ctf_string(_item, _src, _nowrite) \
189 { \
190 .name = #_item, \
191 .type = \
192 { \
193 .atype = atype_string, \
194 .u = \
195 { \
196 .basic = { .string = { .encoding = lttng_encode_UTF8 } } \
197 }, \
198 }, \
199 .nowrite = _nowrite, \
200 },
201
202#undef TP_FIELDS
203#define TP_FIELDS(...) __VA_ARGS__ /* Only one used in this phase */
204
205#undef TRACEPOINT_EVENT_CLASS
206#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
207 static const struct lttng_event_field __event_fields___##_provider##___##_name[] = { \
208 _fields \
209 };
210
211#include TRACEPOINT_INCLUDE
212
213/*
214 * Stage 2 of tracepoint event generation.
215 *
216 * Create probe callback prototypes.
217 */
218
219/* Reset all macros within TRACEPOINT_EVENT */
220#include <lttng/ust-tracepoint-event-reset.h>
221
222#undef TP_ARGS
223#define TP_ARGS(...) __VA_ARGS__
224
225#undef TRACEPOINT_EVENT_CLASS
226#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
227static void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args));
228
229#include TRACEPOINT_INCLUDE
230
231/*
232 * Stage 3 of tracepoint event generation.
233 *
234 * Create static inline function that calculates event size.
235 */
236
237/* Reset all macros within TRACEPOINT_EVENT */
238#include <lttng/ust-tracepoint-event-reset.h>
239#include <lttng/ust-tracepoint-event-write.h>
240
241#undef _ctf_integer_ext
242#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
243 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
244 __event_len += sizeof(_type);
245
246#undef _ctf_float
247#define _ctf_float(_type, _item, _src, _nowrite) \
248 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
249 __event_len += sizeof(_type);
250
251#undef _ctf_array_encoded
252#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _nowrite) \
253 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
254 __event_len += sizeof(_type) * (_length);
255
256#undef _ctf_sequence_encoded
257#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
258 _src_length, _encoding, _nowrite) \
259 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_length_type)); \
260 __event_len += sizeof(_length_type); \
261 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
262 __dynamic_len[__dynamic_len_idx] = (_src_length); \
263 __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \
264 __dynamic_len_idx++;
265
266#undef _ctf_string
267#define _ctf_string(_item, _src, _nowrite) \
268 __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
269
270#undef TP_ARGS
271#define TP_ARGS(...) __VA_ARGS__
272
273#undef TP_FIELDS
274#define TP_FIELDS(...) __VA_ARGS__
275
276#undef TRACEPOINT_EVENT_CLASS
277#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
278static inline lttng_ust_notrace \
279size_t __event_get_size__##_provider##___##_name(size_t *__dynamic_len, _TP_ARGS_DATA_PROTO(_args)); \
280static inline \
281size_t __event_get_size__##_provider##___##_name(size_t *__dynamic_len, _TP_ARGS_DATA_PROTO(_args)) \
282{ \
283 size_t __event_len = 0; \
284 unsigned int __dynamic_len_idx = 0; \
285 \
286 if (0) \
287 (void) __dynamic_len_idx; /* don't warn if unused */ \
288 _fields \
289 return __event_len; \
290}
291
292#include TRACEPOINT_INCLUDE
293
294/*
295 * Stage 3.1 of tracepoint event generation.
296 *
297 * Create static inline function that layout the filter stack data.
298 * We make both write and nowrite data available to the filter.
299 */
300
301/* Reset all macros within TRACEPOINT_EVENT */
302#include <lttng/ust-tracepoint-event-reset.h>
303#include <lttng/ust-tracepoint-event-write.h>
304#include <lttng/ust-tracepoint-event-nowrite.h>
305
306#undef _ctf_integer_ext
307#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
308 if (lttng_is_signed_type(_type)) { \
309 int64_t __ctf_tmp_int64; \
310 switch (sizeof(_type)) { \
311 case 1: \
312 { \
313 union { _type t; int8_t v; } __tmp = { (_type) (_src) }; \
314 __ctf_tmp_int64 = (int64_t) __tmp.v; \
315 break; \
316 } \
317 case 2: \
318 { \
319 union { _type t; int16_t v; } __tmp = { (_type) (_src) }; \
320 __ctf_tmp_int64 = (int64_t) __tmp.v; \
321 break; \
322 } \
323 case 4: \
324 { \
325 union { _type t; int32_t v; } __tmp = { (_type) (_src) }; \
326 __ctf_tmp_int64 = (int64_t) __tmp.v; \
327 break; \
328 } \
329 case 8: \
330 { \
331 union { _type t; int64_t v; } __tmp = { (_type) (_src) }; \
332 __ctf_tmp_int64 = (int64_t) __tmp.v; \
333 break; \
334 } \
335 default: \
336 abort(); \
337 }; \
338 memcpy(__stack_data, &__ctf_tmp_int64, sizeof(int64_t)); \
339 } else { \
340 uint64_t __ctf_tmp_uint64; \
341 switch (sizeof(_type)) { \
342 case 1: \
343 { \
344 union { _type t; uint8_t v; } __tmp = { (_type) (_src) }; \
345 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
346 break; \
347 } \
348 case 2: \
349 { \
350 union { _type t; uint16_t v; } __tmp = { (_type) (_src) }; \
351 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
352 break; \
353 } \
354 case 4: \
355 { \
356 union { _type t; uint32_t v; } __tmp = { (_type) (_src) }; \
357 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
358 break; \
359 } \
360 case 8: \
361 { \
362 union { _type t; uint64_t v; } __tmp = { (_type) (_src) }; \
363 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
364 break; \
365 } \
366 default: \
367 abort(); \
368 }; \
369 memcpy(__stack_data, &__ctf_tmp_uint64, sizeof(uint64_t)); \
370 } \
371 __stack_data += sizeof(int64_t);
372
373#undef _ctf_float
374#define _ctf_float(_type, _item, _src, _nowrite) \
375 { \
376 double __ctf_tmp_double = (double) (_type) (_src); \
377 memcpy(__stack_data, &__ctf_tmp_double, sizeof(double)); \
378 __stack_data += sizeof(double); \
379 }
380
381#undef _ctf_array_encoded
382#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _nowrite) \
383 { \
384 unsigned long __ctf_tmp_ulong = (unsigned long) (_length); \
385 const void *__ctf_tmp_ptr = (_src); \
386 memcpy(__stack_data, &__ctf_tmp_ulong, sizeof(unsigned long)); \
387 __stack_data += sizeof(unsigned long); \
388 memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
389 __stack_data += sizeof(void *); \
390 }
391
392#undef _ctf_sequence_encoded
393#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
394 _src_length, _encoding, _nowrite) \
395 { \
396 unsigned long __ctf_tmp_ulong = (unsigned long) (_src_length); \
397 const void *__ctf_tmp_ptr = (_src); \
398 memcpy(__stack_data, &__ctf_tmp_ulong, sizeof(unsigned long)); \
399 __stack_data += sizeof(unsigned long); \
400 memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
401 __stack_data += sizeof(void *); \
402 }
403
404#undef _ctf_string
405#define _ctf_string(_item, _src, _nowrite) \
406 { \
407 const void *__ctf_tmp_ptr = (_src); \
408 memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
409 __stack_data += sizeof(void *); \
410 }
411
412#undef TP_ARGS
413#define TP_ARGS(...) __VA_ARGS__
414
415#undef TP_FIELDS
416#define TP_FIELDS(...) __VA_ARGS__
417
418#undef TRACEPOINT_EVENT_CLASS
419#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
420static inline \
421void __event_prepare_filter_stack__##_provider##___##_name(char *__stack_data,\
422 _TP_ARGS_DATA_PROTO(_args)) \
423{ \
424 _fields \
425}
426
427#include TRACEPOINT_INCLUDE
428
429
430
431/*
432 * Stage 4 of tracepoint event generation.
433 *
434 * Create static inline function that calculates event payload alignment.
435 */
436
437/* Reset all macros within TRACEPOINT_EVENT */
438#include <lttng/ust-tracepoint-event-reset.h>
439#include <lttng/ust-tracepoint-event-write.h>
440
441#undef _ctf_integer_ext
442#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
443 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
444
445#undef _ctf_float
446#define _ctf_float(_type, _item, _src, _nowrite) \
447 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
448
449#undef _ctf_array_encoded
450#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _nowrite) \
451 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
452
453#undef _ctf_sequence_encoded
454#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
455 _src_length, _encoding, _nowrite) \
456 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_length_type)); \
457 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
458
459#undef _ctf_string
460#define _ctf_string(_item, _src, _nowrite)
461
462#undef TP_ARGS
463#define TP_ARGS(...) __VA_ARGS__
464
465#undef TP_FIELDS
466#define TP_FIELDS(...) __VA_ARGS__
467
468#undef TRACEPOINT_EVENT_CLASS
469#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
470static inline lttng_ust_notrace \
471size_t __event_get_align__##_provider##___##_name(_TP_ARGS_PROTO(_args)); \
472static inline \
473size_t __event_get_align__##_provider##___##_name(_TP_ARGS_PROTO(_args)) \
474{ \
475 size_t __event_align = 1; \
476 _fields \
477 return __event_align; \
478}
479
480#include TRACEPOINT_INCLUDE
481
482
483/*
484 * Stage 5 of tracepoint event generation.
485 *
486 * Create the probe function. This function calls event size calculation
487 * and writes event data into the buffer.
488 */
489
490/* Reset all macros within TRACEPOINT_EVENT */
491#include <lttng/ust-tracepoint-event-reset.h>
492#include <lttng/ust-tracepoint-event-write.h>
493
494#undef _ctf_integer_ext
495#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
496 { \
497 _type __tmp = (_src); \
498 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
499 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
500 }
501
502#undef _ctf_float
503#define _ctf_float(_type, _item, _src, _nowrite) \
504 { \
505 _type __tmp = (_src); \
506 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
507 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
508 }
509
510#undef _ctf_array_encoded
511#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _nowrite) \
512 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
513 __chan->ops->event_write(&__ctx, _src, sizeof(_type) * (_length));
514
515#undef _ctf_sequence_encoded
516#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
517 _src_length, _encoding, _nowrite) \
518 { \
519 _length_type __tmpl = __stackvar.__dynamic_len[__dynamic_len_idx]; \
520 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_length_type));\
521 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(_length_type));\
522 } \
523 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
524 __chan->ops->event_write(&__ctx, _src, \
525 sizeof(_type) * __get_dynamic_len(dest));
526
527/*
528 * __chan->ops->u.has_strcpy is a flag letting us know if the LTTng-UST
529 * tracepoint provider ABI implements event_strcpy. This dynamic check
530 * can be removed when the tracepoint provider ABI moves to 2.
531 */
532#if (LTTNG_UST_PROVIDER_MAJOR > 1)
533#error "Tracepoint probe provider major version has changed. Please remove dynamic check for has_strcpy."
534#endif
535
536#undef _ctf_string
537#define _ctf_string(_item, _src, _nowrite) \
538 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(*(_src))); \
539 if (__chan->ops->u.has_strcpy) \
540 __chan->ops->event_strcpy(&__ctx, _src, \
541 __get_dynamic_len(dest)); \
542 else \
543 __chan->ops->event_write(&__ctx, _src, \
544 __get_dynamic_len(dest));
545
546/* Beware: this get len actually consumes the len value */
547#undef __get_dynamic_len
548#define __get_dynamic_len(field) __stackvar.__dynamic_len[__dynamic_len_idx++]
549
550#undef TP_ARGS
551#define TP_ARGS(...) __VA_ARGS__
552
553#undef TP_FIELDS
554#define TP_FIELDS(...) __VA_ARGS__
555
556/*
557 * For state dump, check that "session" argument (mandatory) matches the
558 * session this event belongs to. Ensures that we write state dump data only
559 * into the started session, not into all sessions.
560 */
561#undef _TP_SESSION_CHECK
562#ifdef TP_SESSION_CHECK
563#define _TP_SESSION_CHECK(session, csession) (session == csession)
564#else /* TP_SESSION_CHECK */
565#define _TP_SESSION_CHECK(session, csession) 1
566#endif /* TP_SESSION_CHECK */
567
568/*
569 * Using twice size for filter stack data to hold size and pointer for
570 * each field (worse case). For integers, max size required is 64-bit.
571 * Same for double-precision floats. Those fit within
572 * 2*sizeof(unsigned long) for all supported architectures.
573 * Perform UNION (||) of filter runtime list.
574 */
575#undef TRACEPOINT_EVENT_CLASS
576#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
577static lttng_ust_notrace \
578void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args)); \
579static \
580void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args)) \
581{ \
582 struct lttng_event *__event = (struct lttng_event *) __tp_data; \
583 struct lttng_channel *__chan = __event->chan; \
584 struct lttng_ust_lib_ring_buffer_ctx __ctx; \
585 size_t __event_len, __event_align; \
586 size_t __dynamic_len_idx = 0; \
587 union { \
588 size_t __dynamic_len[_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name)]; \
589 char __filter_stack_data[2 * sizeof(unsigned long) * _TP_ARRAY_SIZE(__event_fields___##_provider##___##_name)]; \
590 } __stackvar; \
591 int __ret; \
592 \
593 if (0) \
594 (void) __dynamic_len_idx; /* don't warn if unused */ \
595 if (!_TP_SESSION_CHECK(session, __chan->session)) \
596 return; \
597 if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->session->active))) \
598 return; \
599 if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->enabled))) \
600 return; \
601 if (caa_unlikely(!CMM_ACCESS_ONCE(__event->enabled))) \
602 return; \
603 if (caa_unlikely(!TP_RCU_LINK_TEST())) \
604 return; \
605 if (caa_unlikely(!cds_list_empty(&__event->bytecode_runtime_head))) { \
606 struct lttng_bytecode_runtime *bc_runtime; \
607 int __filter_record = __event->has_enablers_without_bytecode; \
608 \
609 __event_prepare_filter_stack__##_provider##___##_name(__stackvar.__filter_stack_data, \
610 _TP_ARGS_DATA_VAR(_args)); \
611 tp_list_for_each_entry_rcu(bc_runtime, &__event->bytecode_runtime_head, node) { \
612 if (caa_unlikely(bc_runtime->filter(bc_runtime, \
613 __stackvar.__filter_stack_data) & LTTNG_FILTER_RECORD_FLAG)) \
614 __filter_record = 1; \
615 } \
616 if (caa_likely(!__filter_record)) \
617 return; \
618 } \
619 __event_len = __event_get_size__##_provider##___##_name(__stackvar.__dynamic_len, \
620 _TP_ARGS_DATA_VAR(_args)); \
621 __event_align = __event_get_align__##_provider##___##_name(_TP_ARGS_VAR(_args)); \
622 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
623 __event_align, -1, __chan->handle); \
624 __ctx.ip = __builtin_return_address(0); \
625 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
626 if (__ret < 0) \
627 return; \
628 _fields \
629 __chan->ops->event_commit(&__ctx); \
630}
631
632#include TRACEPOINT_INCLUDE
633
634#undef __get_dynamic_len
635
636/*
637 * Stage 5.1 of tracepoint event generation.
638 *
639 * Create probe signature
640 */
641
642/* Reset all macros within TRACEPOINT_EVENT */
643#include <lttng/ust-tracepoint-event-reset.h>
644
645#undef TP_ARGS
646#define TP_ARGS(...) __VA_ARGS__
647
648#define _TP_EXTRACT_STRING2(...) #__VA_ARGS__
649
650#undef TRACEPOINT_EVENT_CLASS
651#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
652const char __tp_event_signature___##_provider##___##_name[] = \
653 _TP_EXTRACT_STRING2(_args);
654
655#include TRACEPOINT_INCLUDE
656
657#undef _TP_EXTRACT_STRING2
658
659/*
660 * Stage 6 of tracepoint event generation.
661 *
662 * Tracepoint loglevel mapping definition generation. We generate a
663 * symbol for each mapping for a provider/event to ensure at most a 1 to
664 * 1 mapping between events and loglevels. If the symbol is repeated,
665 * the compiler will complain.
666 */
667
668/* Reset all macros within TRACEPOINT_EVENT */
669#include <lttng/ust-tracepoint-event-reset.h>
670
671#undef TRACEPOINT_LOGLEVEL
672#define TRACEPOINT_LOGLEVEL(__provider, __name, __loglevel) \
673static const int _loglevel_value___##__provider##___##__name = __loglevel; \
674static const int *_loglevel___##__provider##___##__name = \
675 &_loglevel_value___##__provider##___##__name;
676
677#include TRACEPOINT_INCLUDE
678
679/*
680 * Stage 6.1 of tracepoint event generation.
681 *
682 * Tracepoint UML URI info.
683 */
684
685/* Reset all macros within TRACEPOINT_EVENT */
686#include <lttng/ust-tracepoint-event-reset.h>
687
688#undef TRACEPOINT_MODEL_EMF_URI
689#define TRACEPOINT_MODEL_EMF_URI(__provider, __name, __uri) \
690static const char *_model_emf_uri___##__provider##___##__name = __uri;
691
692#include TRACEPOINT_INCLUDE
693
694/*
695 * Stage 7.1 of tracepoint event generation.
696 *
697 * Create events description structures. We use a weakref because
698 * loglevels are optional. If not declared, the event will point to the
699 * a loglevel that contains NULL.
700 */
701
702/* Reset all macros within TRACEPOINT_EVENT */
703#include <lttng/ust-tracepoint-event-reset.h>
704
705#undef TRACEPOINT_EVENT_INSTANCE
706#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
707static const int * \
708 __ref_loglevel___##_provider##___##_name \
709 __attribute__((weakref ("_loglevel___" #_provider "___" #_name))); \
710static const char * \
711 __ref_model_emf_uri___##_provider##___##_name \
712 __attribute__((weakref ("_model_emf_uri___" #_provider "___" #_name)));\
713const struct lttng_event_desc __event_desc___##_provider##_##_name = { \
714 .name = #_provider ":" #_name, \
715 .probe_callback = (void (*)(void)) &__event_probe__##_provider##___##_template,\
716 .ctx = NULL, \
717 .fields = __event_fields___##_provider##___##_template, \
718 .nr_fields = _TP_ARRAY_SIZE(__event_fields___##_provider##___##_template), \
719 .loglevel = &__ref_loglevel___##_provider##___##_name, \
720 .signature = __tp_event_signature___##_provider##___##_template, \
721 .u = { .ext = { .model_emf_uri = &__ref_model_emf_uri___##_provider##___##_name } }, \
722};
723
724#include TRACEPOINT_INCLUDE
725
726/*
727 * Stage 7.2 of tracepoint event generation.
728 *
729 * Create array of events.
730 */
731
732/* Reset all macros within TRACEPOINT_EVENT */
733#include <lttng/ust-tracepoint-event-reset.h>
734
735#undef TRACEPOINT_EVENT_INSTANCE
736#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
737 &__event_desc___##_provider##_##_name,
738
739static const struct lttng_event_desc *_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)[] = {
740#include TRACEPOINT_INCLUDE
741};
742
743
744/*
745 * Stage 8 of tracepoint event generation.
746 *
747 * Create a toplevel descriptor for the whole probe.
748 */
749
750/* non-const because list head will be modified when registered. */
751static struct lttng_probe_desc _TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER) = {
752 .provider = __tp_stringify(TRACEPOINT_PROVIDER),
753 .event_desc = _TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER),
754 .nr_events = _TP_ARRAY_SIZE(_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)),
755 .head = { NULL, NULL },
756 .lazy_init_head = { NULL, NULL },
757 .lazy = 0,
758 .major = LTTNG_UST_PROVIDER_MAJOR,
759 .minor = LTTNG_UST_PROVIDER_MINOR,
760};
761
762static int _TP_COMBINE_TOKENS(__probe_register_refcount___, TRACEPOINT_PROVIDER);
763
764/*
765 * Stage 9 of tracepoint event generation.
766 *
767 * Register/unregister probes at module load/unload.
768 *
769 * Generate the constructor as an externally visible symbol for use when
770 * linking the probe statically.
771 *
772 * Register refcount is protected by libc dynamic loader mutex.
773 */
774
775/* Reset all macros within TRACEPOINT_EVENT */
776#include <lttng/ust-tracepoint-event-reset.h>
777static void lttng_ust_notrace __attribute__((constructor))
778_TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void);
779static void
780_TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void)
781{
782 int ret;
783
784 if (_TP_COMBINE_TOKENS(__probe_register_refcount___,
785 TRACEPOINT_PROVIDER)++) {
786 return;
787 }
788 /*
789 * __tracepoint_provider_check_ ## TRACEPOINT_PROVIDER() is a
790 * static inline function that ensures every probe PROVIDER
791 * argument match the provider within which they appear. It
792 * calls empty static inline functions, and therefore has no
793 * runtime effect. However, if it detects an error, a linker
794 * error will appear.
795 */
796 _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)();
797 ret = lttng_probe_register(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
798 if (ret) {
799 fprintf(stderr, "LTTng-UST: Error (%d) while registering tracepoint probe. Duplicate registration of tracepoint probes having the same name is not allowed.\n", ret);
800 abort();
801 }
802}
803
804static void lttng_ust_notrace __attribute__((destructor))
805_TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void);
806static void
807_TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void)
808{
809 if (--_TP_COMBINE_TOKENS(__probe_register_refcount___,
810 TRACEPOINT_PROVIDER)) {
811 return;
812 }
813 lttng_probe_unregister(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
814}
815
816int _TP_COMBINE_TOKENS(__tracepoint_provider_, TRACEPOINT_PROVIDER);
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