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Allow TP_IP_PARAM arg name to be configured
[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#undef _TP_IP_PARAM
569#ifdef TP_IP_PARAM
570#define _TP_IP_PARAM(x) (x)
571#else /* TP_IP_PARAM */
572#define _TP_IP_PARAM(x) __builtin_return_address(0)
573#endif /* TP_IP_PARAM */
574
575/*
576 * Using twice size for filter stack data to hold size and pointer for
577 * each field (worse case). For integers, max size required is 64-bit.
578 * Same for double-precision floats. Those fit within
579 * 2*sizeof(unsigned long) for all supported architectures.
580 * Perform UNION (||) of filter runtime list.
581 */
582#undef TRACEPOINT_EVENT_CLASS
583#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
584static lttng_ust_notrace \
585void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args)); \
586static \
587void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args)) \
588{ \
589 struct lttng_event *__event = (struct lttng_event *) __tp_data; \
590 struct lttng_channel *__chan = __event->chan; \
591 struct lttng_ust_lib_ring_buffer_ctx __ctx; \
592 size_t __event_len, __event_align; \
593 size_t __dynamic_len_idx = 0; \
594 union { \
595 size_t __dynamic_len[_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name)]; \
596 char __filter_stack_data[2 * sizeof(unsigned long) * _TP_ARRAY_SIZE(__event_fields___##_provider##___##_name)]; \
597 } __stackvar; \
598 int __ret; \
599 \
600 if (0) \
601 (void) __dynamic_len_idx; /* don't warn if unused */ \
602 if (!_TP_SESSION_CHECK(session, __chan->session)) \
603 return; \
604 if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->session->active))) \
605 return; \
606 if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->enabled))) \
607 return; \
608 if (caa_unlikely(!CMM_ACCESS_ONCE(__event->enabled))) \
609 return; \
610 if (caa_unlikely(!TP_RCU_LINK_TEST())) \
611 return; \
612 if (caa_unlikely(!cds_list_empty(&__event->bytecode_runtime_head))) { \
613 struct lttng_bytecode_runtime *bc_runtime; \
614 int __filter_record = __event->has_enablers_without_bytecode; \
615 \
616 __event_prepare_filter_stack__##_provider##___##_name(__stackvar.__filter_stack_data, \
617 _TP_ARGS_DATA_VAR(_args)); \
618 tp_list_for_each_entry_rcu(bc_runtime, &__event->bytecode_runtime_head, node) { \
619 if (caa_unlikely(bc_runtime->filter(bc_runtime, \
620 __stackvar.__filter_stack_data) & LTTNG_FILTER_RECORD_FLAG)) \
621 __filter_record = 1; \
622 } \
623 if (caa_likely(!__filter_record)) \
624 return; \
625 } \
626 __event_len = __event_get_size__##_provider##___##_name(__stackvar.__dynamic_len, \
627 _TP_ARGS_DATA_VAR(_args)); \
628 __event_align = __event_get_align__##_provider##___##_name(_TP_ARGS_VAR(_args)); \
629 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
630 __event_align, -1, __chan->handle); \
631 __ctx.ip = _TP_IP_PARAM(TP_IP_PARAM); \
632 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
633 if (__ret < 0) \
634 return; \
635 _fields \
636 __chan->ops->event_commit(&__ctx); \
637}
638
639#include TRACEPOINT_INCLUDE
640
641#undef __get_dynamic_len
642
643/*
644 * Stage 5.1 of tracepoint event generation.
645 *
646 * Create probe signature
647 */
648
649/* Reset all macros within TRACEPOINT_EVENT */
650#include <lttng/ust-tracepoint-event-reset.h>
651
652#undef TP_ARGS
653#define TP_ARGS(...) __VA_ARGS__
654
655#define _TP_EXTRACT_STRING2(...) #__VA_ARGS__
656
657#undef TRACEPOINT_EVENT_CLASS
658#define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
659const char __tp_event_signature___##_provider##___##_name[] = \
660 _TP_EXTRACT_STRING2(_args);
661
662#include TRACEPOINT_INCLUDE
663
664#undef _TP_EXTRACT_STRING2
665
666/*
667 * Stage 6 of tracepoint event generation.
668 *
669 * Tracepoint loglevel mapping definition generation. We generate a
670 * symbol for each mapping for a provider/event to ensure at most a 1 to
671 * 1 mapping between events and loglevels. If the symbol is repeated,
672 * the compiler will complain.
673 */
674
675/* Reset all macros within TRACEPOINT_EVENT */
676#include <lttng/ust-tracepoint-event-reset.h>
677
678#undef TRACEPOINT_LOGLEVEL
679#define TRACEPOINT_LOGLEVEL(__provider, __name, __loglevel) \
680static const int _loglevel_value___##__provider##___##__name = __loglevel; \
681static const int *_loglevel___##__provider##___##__name = \
682 &_loglevel_value___##__provider##___##__name;
683
684#include TRACEPOINT_INCLUDE
685
686/*
687 * Stage 6.1 of tracepoint event generation.
688 *
689 * Tracepoint UML URI info.
690 */
691
692/* Reset all macros within TRACEPOINT_EVENT */
693#include <lttng/ust-tracepoint-event-reset.h>
694
695#undef TRACEPOINT_MODEL_EMF_URI
696#define TRACEPOINT_MODEL_EMF_URI(__provider, __name, __uri) \
697static const char *_model_emf_uri___##__provider##___##__name = __uri;
698
699#include TRACEPOINT_INCLUDE
700
701/*
702 * Stage 7.1 of tracepoint event generation.
703 *
704 * Create events description structures. We use a weakref because
705 * loglevels are optional. If not declared, the event will point to the
706 * a loglevel that contains NULL.
707 */
708
709/* Reset all macros within TRACEPOINT_EVENT */
710#include <lttng/ust-tracepoint-event-reset.h>
711
712#undef TRACEPOINT_EVENT_INSTANCE
713#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
714static const int * \
715 __ref_loglevel___##_provider##___##_name \
716 __attribute__((weakref ("_loglevel___" #_provider "___" #_name))); \
717static const char * \
718 __ref_model_emf_uri___##_provider##___##_name \
719 __attribute__((weakref ("_model_emf_uri___" #_provider "___" #_name)));\
720const struct lttng_event_desc __event_desc___##_provider##_##_name = { \
721 .name = #_provider ":" #_name, \
722 .probe_callback = (void (*)(void)) &__event_probe__##_provider##___##_template,\
723 .ctx = NULL, \
724 .fields = __event_fields___##_provider##___##_template, \
725 .nr_fields = _TP_ARRAY_SIZE(__event_fields___##_provider##___##_template), \
726 .loglevel = &__ref_loglevel___##_provider##___##_name, \
727 .signature = __tp_event_signature___##_provider##___##_template, \
728 .u = { .ext = { .model_emf_uri = &__ref_model_emf_uri___##_provider##___##_name } }, \
729};
730
731#include TRACEPOINT_INCLUDE
732
733/*
734 * Stage 7.2 of tracepoint event generation.
735 *
736 * Create array of events.
737 */
738
739/* Reset all macros within TRACEPOINT_EVENT */
740#include <lttng/ust-tracepoint-event-reset.h>
741
742#undef TRACEPOINT_EVENT_INSTANCE
743#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
744 &__event_desc___##_provider##_##_name,
745
746static const struct lttng_event_desc *_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)[] = {
747#include TRACEPOINT_INCLUDE
748};
749
750
751/*
752 * Stage 8 of tracepoint event generation.
753 *
754 * Create a toplevel descriptor for the whole probe.
755 */
756
757/* non-const because list head will be modified when registered. */
758static struct lttng_probe_desc _TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER) = {
759 .provider = __tp_stringify(TRACEPOINT_PROVIDER),
760 .event_desc = _TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER),
761 .nr_events = _TP_ARRAY_SIZE(_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)),
762 .head = { NULL, NULL },
763 .lazy_init_head = { NULL, NULL },
764 .lazy = 0,
765 .major = LTTNG_UST_PROVIDER_MAJOR,
766 .minor = LTTNG_UST_PROVIDER_MINOR,
767};
768
769static int _TP_COMBINE_TOKENS(__probe_register_refcount___, TRACEPOINT_PROVIDER);
770
771/*
772 * Stage 9 of tracepoint event generation.
773 *
774 * Register/unregister probes at module load/unload.
775 *
776 * Generate the constructor as an externally visible symbol for use when
777 * linking the probe statically.
778 *
779 * Register refcount is protected by libc dynamic loader mutex.
780 */
781
782/* Reset all macros within TRACEPOINT_EVENT */
783#include <lttng/ust-tracepoint-event-reset.h>
784static void lttng_ust_notrace __attribute__((constructor))
785_TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void);
786static void
787_TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void)
788{
789 int ret;
790
791 if (_TP_COMBINE_TOKENS(__probe_register_refcount___,
792 TRACEPOINT_PROVIDER)++) {
793 return;
794 }
795 /*
796 * __tracepoint_provider_check_ ## TRACEPOINT_PROVIDER() is a
797 * static inline function that ensures every probe PROVIDER
798 * argument match the provider within which they appear. It
799 * calls empty static inline functions, and therefore has no
800 * runtime effect. However, if it detects an error, a linker
801 * error will appear.
802 */
803 _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)();
804 ret = lttng_probe_register(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
805 if (ret) {
806 fprintf(stderr, "LTTng-UST: Error (%d) while registering tracepoint probe. Duplicate registration of tracepoint probes having the same name is not allowed.\n", ret);
807 abort();
808 }
809}
810
811static void lttng_ust_notrace __attribute__((destructor))
812_TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void);
813static void
814_TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void)
815{
816 if (--_TP_COMBINE_TOKENS(__probe_register_refcount___,
817 TRACEPOINT_PROVIDER)) {
818 return;
819 }
820 lttng_probe_unregister(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
821}
822
823int _TP_COMBINE_TOKENS(__tracepoint_provider_, TRACEPOINT_PROVIDER);
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