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Fix: don't generate 0-len array in tracepoint probes
[lttng-ust.git] / include / lttng / ust-tracepoint-event.h
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 <byteswap.h>
32 #include <string.h>
33
34 #define __LTTNG_UST_NULL_STRING "(null)"
35
36 #undef tp_list_for_each_entry_rcu
37 #define tp_list_for_each_entry_rcu(pos, head, member) \
38 for (pos = cds_list_entry(tp_rcu_dereference_bp((head)->next), __typeof__(*pos), member); \
39 &pos->member != (head); \
40 pos = cds_list_entry(tp_rcu_dereference_bp(pos->member.next), __typeof__(*pos), member))
41
42 /*
43 * TRACEPOINT_EVENT_CLASS declares a class of tracepoints receiving the
44 * same arguments and having the same field layout.
45 *
46 * TRACEPOINT_EVENT_INSTANCE declares an instance of a tracepoint, with
47 * its own provider and name. It refers to a class (template).
48 *
49 * TRACEPOINT_EVENT declared both a class and an instance and does a
50 * direct mapping from the instance to the class.
51 */
52
53 #undef TRACEPOINT_EVENT
54 #define TRACEPOINT_EVENT(_provider, _name, _args, _fields) \
55 TRACEPOINT_EVENT_CLASS(_provider, _name, \
56 _TP_PARAMS(_args), \
57 _TP_PARAMS(_fields)) \
58 TRACEPOINT_EVENT_INSTANCE(_provider, _name, _name, \
59 _TP_PARAMS(_args))
60
61 /* Helpers */
62 #define _TP_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
63
64 #define _tp_max_t(type, x, y) \
65 ({ \
66 type __max1 = (x); \
67 type __max2 = (y); \
68 __max1 > __max2 ? __max1: __max2; \
69 })
70
71 /*
72 * Stage 0 of tracepoint event generation.
73 *
74 * Check that each TRACEPOINT_EVENT provider argument match the
75 * TRACEPOINT_PROVIDER by creating dummy callbacks.
76 */
77
78 /* Reset all macros within TRACEPOINT_EVENT */
79 #include <lttng/ust-tracepoint-event-reset.h>
80
81 static inline lttng_ust_notrace
82 void _TP_COMBINE_TOKENS(__tracepoint_provider_mismatch_, TRACEPOINT_PROVIDER)(void);
83 static inline
84 void _TP_COMBINE_TOKENS(__tracepoint_provider_mismatch_, TRACEPOINT_PROVIDER)(void)
85 {
86 }
87
88 #undef TRACEPOINT_EVENT_CLASS
89 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
90 __tracepoint_provider_mismatch_##_provider();
91
92 #undef TRACEPOINT_EVENT_INSTANCE
93 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
94 __tracepoint_provider_mismatch_##_provider();
95
96 static inline lttng_ust_notrace
97 void _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)(void);
98 static inline
99 void _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)(void)
100 {
101 #include TRACEPOINT_INCLUDE
102 }
103
104 /*
105 * Stage 0.1 of tracepoint event generation.
106 *
107 * Check that each TRACEPOINT_EVENT provider:name does not exceed the
108 * tracepoint name length limit.
109 */
110
111 /* Reset all macros within TRACEPOINT_EVENT */
112 #include <lttng/ust-tracepoint-event-reset.h>
113
114 #undef TRACEPOINT_EVENT_INSTANCE
115 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
116 static const char \
117 __tp_name_len_check##_provider##___##_name[LTTNG_UST_SYM_NAME_LEN] \
118 __attribute__((unused)) = \
119 #_provider ":" #_name;
120
121 #include TRACEPOINT_INCLUDE
122
123 /*
124 * Stage 0.9 of tracepoint event generation
125 *
126 * Unfolding the enums
127 */
128 #include <lttng/ust-tracepoint-event-reset.h>
129
130 /* Enumeration entry (single value) */
131 #undef ctf_enum_value
132 #define ctf_enum_value(_string, _value) \
133 { \
134 .start = { \
135 .signedness = lttng_is_signed_type(__typeof__(_value)), \
136 .value = lttng_is_signed_type(__typeof__(_value)) ? \
137 (long long) (_value) : (_value), \
138 }, \
139 .end = { \
140 .signedness = lttng_is_signed_type(__typeof__(_value)), \
141 .value = lttng_is_signed_type(__typeof__(_value)) ? \
142 (long long) (_value) : (_value), \
143 }, \
144 .string = (_string), \
145 },
146
147 /* Enumeration entry (range) */
148 #undef ctf_enum_range
149 #define ctf_enum_range(_string, _range_start, _range_end) \
150 { \
151 .start = { \
152 .signedness = lttng_is_signed_type(__typeof__(_range_start)), \
153 .value = lttng_is_signed_type(__typeof__(_range_start)) ? \
154 (long long) (_range_start) : (_range_start), \
155 }, \
156 .end = { \
157 .signedness = lttng_is_signed_type(__typeof__(_range_end)), \
158 .value = lttng_is_signed_type(__typeof__(_range_end)) ? \
159 (long long) (_range_end) : (_range_end), \
160 }, \
161 .string = (_string), \
162 },
163
164 #undef TP_ENUM_VALUES
165 #define TP_ENUM_VALUES(...) \
166 __VA_ARGS__
167
168 #undef TRACEPOINT_ENUM
169 #define TRACEPOINT_ENUM(_provider, _name, _values) \
170 const struct lttng_enum_entry __enum_values__##_provider##_##_name[] = { \
171 _values \
172 ctf_enum_value("", 0) /* Dummy, 0-len array forbidden by C99. */ \
173 };
174
175 #include TRACEPOINT_INCLUDE
176
177 /*
178 * Stage 1 of tracepoint event generation.
179 *
180 * Create event field type metadata section.
181 * Each event produce an array of fields.
182 */
183
184 /* Reset all macros within TRACEPOINT_EVENT */
185 #include <lttng/ust-tracepoint-event-reset.h>
186 #include <lttng/ust-tracepoint-event-write.h>
187 #include <lttng/ust-tracepoint-event-nowrite.h>
188
189 #undef _ctf_integer_ext
190 #define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
191 { \
192 .name = #_item, \
193 .type = __type_integer(_type, _byte_order, _base, none),\
194 .nowrite = _nowrite, \
195 },
196
197 #undef _ctf_float
198 #define _ctf_float(_type, _item, _src, _nowrite) \
199 { \
200 .name = #_item, \
201 .type = __type_float(_type), \
202 .nowrite = _nowrite, \
203 },
204
205 #undef _ctf_array_encoded
206 #define _ctf_array_encoded(_type, _item, _src, _byte_order, \
207 _length, _encoding, _nowrite, \
208 _elem_type_base) \
209 { \
210 .name = #_item, \
211 .type = \
212 { \
213 .atype = atype_array, \
214 .u = \
215 { \
216 .array = \
217 { \
218 .elem_type = __type_integer(_type, _byte_order, _elem_type_base, _encoding), \
219 .length = _length, \
220 } \
221 } \
222 }, \
223 .nowrite = _nowrite, \
224 },
225
226 #undef _ctf_sequence_encoded
227 #define _ctf_sequence_encoded(_type, _item, _src, _byte_order, \
228 _length_type, _src_length, _encoding, _nowrite, \
229 _elem_type_base) \
230 { \
231 .name = #_item, \
232 .type = \
233 { \
234 .atype = atype_sequence, \
235 .u = \
236 { \
237 .sequence = \
238 { \
239 .length_type = __type_integer(_length_type, BYTE_ORDER, 10, none), \
240 .elem_type = __type_integer(_type, _byte_order, _elem_type_base, _encoding), \
241 }, \
242 }, \
243 }, \
244 .nowrite = _nowrite, \
245 },
246
247 #undef _ctf_string
248 #define _ctf_string(_item, _src, _nowrite) \
249 { \
250 .name = #_item, \
251 .type = \
252 { \
253 .atype = atype_string, \
254 .u = \
255 { \
256 .basic = { .string = { .encoding = lttng_encode_UTF8 } } \
257 }, \
258 }, \
259 .nowrite = _nowrite, \
260 },
261
262 #undef _ctf_enum
263 #define _ctf_enum(_provider, _name, _type, _item, _src, _nowrite) \
264 { \
265 .name = #_item, \
266 .type = { \
267 .atype = atype_enum, \
268 .u = { \
269 .basic = { \
270 .enumeration = { \
271 .desc = &__enum_##_provider##_##_name, \
272 .container_type = { \
273 .size = sizeof(_type) * CHAR_BIT, \
274 .alignment = lttng_alignof(_type) * CHAR_BIT, \
275 .signedness = lttng_is_signed_type(_type), \
276 .reverse_byte_order = 0, \
277 .base = 10, \
278 .encoding = lttng_encode_none, \
279 }, \
280 }, \
281 }, \
282 }, \
283 }, \
284 .nowrite = _nowrite, \
285 },
286
287 #undef TP_FIELDS
288 #define TP_FIELDS(...) __VA_ARGS__ /* Only one used in this phase */
289
290 #undef TRACEPOINT_EVENT_CLASS
291 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
292 static const struct lttng_event_field __event_fields___##_provider##___##_name[] = { \
293 _fields \
294 ctf_integer(int, dummy, 0) /* Dummy, C99 forbids 0-len array. */ \
295 };
296
297 #undef TRACEPOINT_ENUM
298 #define TRACEPOINT_ENUM(_provider, _name, _values) \
299 static const struct lttng_enum_desc __enum_##_provider##_##_name = { \
300 .name = #_provider "_" #_name, \
301 .entries = __enum_values__##_provider##_##_name, \
302 .nr_entries = _TP_ARRAY_SIZE(__enum_values__##_provider##_##_name) - 1, \
303 };
304
305 #include TRACEPOINT_INCLUDE
306
307 /*
308 * Stage 2 of tracepoint event generation.
309 *
310 * Create probe callback prototypes.
311 */
312
313 /* Reset all macros within TRACEPOINT_EVENT */
314 #include <lttng/ust-tracepoint-event-reset.h>
315
316 #undef TP_ARGS
317 #define TP_ARGS(...) __VA_ARGS__
318
319 #undef TRACEPOINT_EVENT_CLASS
320 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
321 static void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args));
322
323 #include TRACEPOINT_INCLUDE
324
325 /*
326 * Stage 3.0 of tracepoint event generation.
327 *
328 * Create static inline function that calculates event size.
329 */
330
331 /* Reset all macros within TRACEPOINT_EVENT */
332 #include <lttng/ust-tracepoint-event-reset.h>
333 #include <lttng/ust-tracepoint-event-write.h>
334
335 #undef _ctf_integer_ext
336 #define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
337 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
338 __event_len += sizeof(_type);
339
340 #undef _ctf_float
341 #define _ctf_float(_type, _item, _src, _nowrite) \
342 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
343 __event_len += sizeof(_type);
344
345 #undef _ctf_array_encoded
346 #define _ctf_array_encoded(_type, _item, _src, _byte_order, _length, _encoding, \
347 _nowrite, _elem_type_base) \
348 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
349 __event_len += sizeof(_type) * (_length);
350
351 #undef _ctf_sequence_encoded
352 #define _ctf_sequence_encoded(_type, _item, _src, _byte_order, _length_type, \
353 _src_length, _encoding, _nowrite, _elem_type_base) \
354 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_length_type)); \
355 __event_len += sizeof(_length_type); \
356 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
357 __dynamic_len[__dynamic_len_idx] = (_src_length); \
358 __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \
359 __dynamic_len_idx++;
360
361 #undef _ctf_string
362 #define _ctf_string(_item, _src, _nowrite) \
363 __event_len += __dynamic_len[__dynamic_len_idx++] = \
364 strlen((_src) ? (_src) : __LTTNG_UST_NULL_STRING) + 1;
365
366 #undef _ctf_enum
367 #define _ctf_enum(_provider, _name, _type, _item, _src, _nowrite) \
368 _ctf_integer_ext(_type, _item, _src, BYTE_ORDER, 10, _nowrite)
369
370 #undef TP_ARGS
371 #define TP_ARGS(...) __VA_ARGS__
372
373 #undef TP_FIELDS
374 #define TP_FIELDS(...) __VA_ARGS__
375
376 #undef TRACEPOINT_EVENT_CLASS
377 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
378 static inline lttng_ust_notrace \
379 size_t __event_get_size__##_provider##___##_name(size_t *__dynamic_len, _TP_ARGS_DATA_PROTO(_args)); \
380 static inline \
381 size_t __event_get_size__##_provider##___##_name(size_t *__dynamic_len, _TP_ARGS_DATA_PROTO(_args)) \
382 { \
383 size_t __event_len = 0; \
384 unsigned int __dynamic_len_idx = 0; \
385 \
386 if (0) \
387 (void) __dynamic_len_idx; /* don't warn if unused */ \
388 _fields \
389 return __event_len; \
390 }
391
392 #include TRACEPOINT_INCLUDE
393
394 /*
395 * Stage 3.1 of tracepoint event generation.
396 *
397 * Create static inline function that layout the filter stack data.
398 * We make both write and nowrite data available to the filter.
399 */
400
401 /* Reset all macros within TRACEPOINT_EVENT */
402 #include <lttng/ust-tracepoint-event-reset.h>
403 #include <lttng/ust-tracepoint-event-write.h>
404 #include <lttng/ust-tracepoint-event-nowrite.h>
405
406 #undef _ctf_integer_ext
407 #define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
408 if (lttng_is_signed_type(_type)) { \
409 int64_t __ctf_tmp_int64; \
410 switch (sizeof(_type)) { \
411 case 1: \
412 { \
413 union { _type t; int8_t v; } __tmp = { (_type) (_src) }; \
414 __ctf_tmp_int64 = (int64_t) __tmp.v; \
415 break; \
416 } \
417 case 2: \
418 { \
419 union { _type t; int16_t v; } __tmp = { (_type) (_src) }; \
420 if (_byte_order != BYTE_ORDER) \
421 __tmp.v = bswap_16(__tmp.v); \
422 __ctf_tmp_int64 = (int64_t) __tmp.v; \
423 break; \
424 } \
425 case 4: \
426 { \
427 union { _type t; int32_t v; } __tmp = { (_type) (_src) }; \
428 if (_byte_order != BYTE_ORDER) \
429 __tmp.v = bswap_32(__tmp.v); \
430 __ctf_tmp_int64 = (int64_t) __tmp.v; \
431 break; \
432 } \
433 case 8: \
434 { \
435 union { _type t; int64_t v; } __tmp = { (_type) (_src) }; \
436 if (_byte_order != BYTE_ORDER) \
437 __tmp.v = bswap_64(__tmp.v); \
438 __ctf_tmp_int64 = (int64_t) __tmp.v; \
439 break; \
440 } \
441 default: \
442 abort(); \
443 }; \
444 memcpy(__stack_data, &__ctf_tmp_int64, sizeof(int64_t)); \
445 } else { \
446 uint64_t __ctf_tmp_uint64; \
447 switch (sizeof(_type)) { \
448 case 1: \
449 { \
450 union { _type t; uint8_t v; } __tmp = { (_type) (_src) }; \
451 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
452 break; \
453 } \
454 case 2: \
455 { \
456 union { _type t; uint16_t v; } __tmp = { (_type) (_src) }; \
457 if (_byte_order != BYTE_ORDER) \
458 __tmp.v = bswap_16(__tmp.v); \
459 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
460 break; \
461 } \
462 case 4: \
463 { \
464 union { _type t; uint32_t v; } __tmp = { (_type) (_src) }; \
465 if (_byte_order != BYTE_ORDER) \
466 __tmp.v = bswap_32(__tmp.v); \
467 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
468 break; \
469 } \
470 case 8: \
471 { \
472 union { _type t; uint64_t v; } __tmp = { (_type) (_src) }; \
473 if (_byte_order != BYTE_ORDER) \
474 __tmp.v = bswap_64(__tmp.v); \
475 __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
476 break; \
477 } \
478 default: \
479 abort(); \
480 }; \
481 memcpy(__stack_data, &__ctf_tmp_uint64, sizeof(uint64_t)); \
482 } \
483 __stack_data += sizeof(int64_t);
484
485 #undef _ctf_float
486 #define _ctf_float(_type, _item, _src, _nowrite) \
487 { \
488 double __ctf_tmp_double = (double) (_type) (_src); \
489 memcpy(__stack_data, &__ctf_tmp_double, sizeof(double)); \
490 __stack_data += sizeof(double); \
491 }
492
493 #undef _ctf_array_encoded
494 #define _ctf_array_encoded(_type, _item, _src, _byte_order, _length, \
495 _encoding, _nowrite, _elem_type_base) \
496 { \
497 unsigned long __ctf_tmp_ulong = (unsigned long) (_length); \
498 const void *__ctf_tmp_ptr = (_src); \
499 memcpy(__stack_data, &__ctf_tmp_ulong, sizeof(unsigned long)); \
500 __stack_data += sizeof(unsigned long); \
501 memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
502 __stack_data += sizeof(void *); \
503 }
504
505 #undef _ctf_sequence_encoded
506 #define _ctf_sequence_encoded(_type, _item, _src, _byte_order, _length_type, \
507 _src_length, _encoding, _nowrite, _elem_type_base) \
508 { \
509 unsigned long __ctf_tmp_ulong = (unsigned long) (_src_length); \
510 const void *__ctf_tmp_ptr = (_src); \
511 memcpy(__stack_data, &__ctf_tmp_ulong, sizeof(unsigned long)); \
512 __stack_data += sizeof(unsigned long); \
513 memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
514 __stack_data += sizeof(void *); \
515 }
516
517 #undef _ctf_string
518 #define _ctf_string(_item, _src, _nowrite) \
519 { \
520 const void *__ctf_tmp_ptr = \
521 ((_src) ? (_src) : __LTTNG_UST_NULL_STRING); \
522 memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
523 __stack_data += sizeof(void *); \
524 }
525
526 #undef _ctf_enum
527 #define _ctf_enum(_provider, _name, _type, _item, _src, _nowrite) \
528 _ctf_integer_ext(_type, _item, _src, BYTE_ORDER, 10, _nowrite)
529
530 #undef TP_ARGS
531 #define TP_ARGS(...) __VA_ARGS__
532
533 #undef TP_FIELDS
534 #define TP_FIELDS(...) __VA_ARGS__
535
536 #undef TRACEPOINT_EVENT_CLASS
537 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
538 static inline \
539 void __event_prepare_filter_stack__##_provider##___##_name(char *__stack_data,\
540 _TP_ARGS_DATA_PROTO(_args)) \
541 { \
542 _fields \
543 }
544
545 #include TRACEPOINT_INCLUDE
546
547 /*
548 * Stage 4 of tracepoint event generation.
549 *
550 * Create static inline function that calculates event payload alignment.
551 */
552
553 /* Reset all macros within TRACEPOINT_EVENT */
554 #include <lttng/ust-tracepoint-event-reset.h>
555 #include <lttng/ust-tracepoint-event-write.h>
556
557 #undef _ctf_integer_ext
558 #define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
559 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
560
561 #undef _ctf_float
562 #define _ctf_float(_type, _item, _src, _nowrite) \
563 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
564
565 #undef _ctf_array_encoded
566 #define _ctf_array_encoded(_type, _item, _src, _byte_order, _length, \
567 _encoding, _nowrite, _elem_type_base) \
568 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
569
570 #undef _ctf_sequence_encoded
571 #define _ctf_sequence_encoded(_type, _item, _src, _byte_order, _length_type, \
572 _src_length, _encoding, _nowrite, _elem_type_base) \
573 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_length_type)); \
574 __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
575
576 #undef _ctf_string
577 #define _ctf_string(_item, _src, _nowrite)
578
579 #undef _ctf_enum
580 #define _ctf_enum(_provider, _name, _type, _item, _src, _nowrite) \
581 _ctf_integer_ext(_type, _item, _src, BYTE_ORDER, 10, _nowrite)
582
583 #undef TP_ARGS
584 #define TP_ARGS(...) __VA_ARGS__
585
586 #undef TP_FIELDS
587 #define TP_FIELDS(...) __VA_ARGS__
588
589 #undef TRACEPOINT_EVENT_CLASS
590 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
591 static inline lttng_ust_notrace \
592 size_t __event_get_align__##_provider##___##_name(_TP_ARGS_PROTO(_args)); \
593 static inline \
594 size_t __event_get_align__##_provider##___##_name(_TP_ARGS_PROTO(_args)) \
595 { \
596 size_t __event_align = 1; \
597 _fields \
598 return __event_align; \
599 }
600
601 #include TRACEPOINT_INCLUDE
602
603
604 /*
605 * Stage 5 of tracepoint event generation.
606 *
607 * Create the probe function. This function calls event size calculation
608 * and writes event data into the buffer.
609 */
610
611 /* Reset all macros within TRACEPOINT_EVENT */
612 #include <lttng/ust-tracepoint-event-reset.h>
613 #include <lttng/ust-tracepoint-event-write.h>
614
615 #undef _ctf_integer_ext
616 #define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _nowrite) \
617 { \
618 _type __tmp = (_src); \
619 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
620 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
621 }
622
623 #undef _ctf_float
624 #define _ctf_float(_type, _item, _src, _nowrite) \
625 { \
626 _type __tmp = (_src); \
627 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
628 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
629 }
630
631 #undef _ctf_array_encoded
632 #define _ctf_array_encoded(_type, _item, _src, _byte_order, _length, \
633 _encoding, _nowrite, _elem_type_base) \
634 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
635 __chan->ops->event_write(&__ctx, _src, sizeof(_type) * (_length));
636
637 #undef _ctf_sequence_encoded
638 #define _ctf_sequence_encoded(_type, _item, _src, _byte_order, _length_type, \
639 _src_length, _encoding, _nowrite, _elem_type_base) \
640 { \
641 _length_type __tmpl = __stackvar.__dynamic_len[__dynamic_len_idx]; \
642 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_length_type));\
643 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(_length_type));\
644 } \
645 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
646 __chan->ops->event_write(&__ctx, _src, \
647 sizeof(_type) * __get_dynamic_len(dest));
648
649 /*
650 * __chan->ops->u.has_strcpy is a flag letting us know if the LTTng-UST
651 * tracepoint provider ABI implements event_strcpy. This dynamic check
652 * can be removed when the tracepoint provider ABI moves to 2.
653 */
654 #if (LTTNG_UST_PROVIDER_MAJOR > 1)
655 #error "Tracepoint probe provider major version has changed. Please remove dynamic check for has_strcpy."
656 #endif
657
658 #undef _ctf_string
659 #define _ctf_string(_item, _src, _nowrite) \
660 { \
661 const char *__ctf_tmp_string = \
662 ((_src) ? (_src) : __LTTNG_UST_NULL_STRING); \
663 lib_ring_buffer_align_ctx(&__ctx, \
664 lttng_alignof(*__ctf_tmp_string)); \
665 if (__chan->ops->u.has_strcpy) \
666 __chan->ops->event_strcpy(&__ctx, __ctf_tmp_string, \
667 __get_dynamic_len(dest)); \
668 else \
669 __chan->ops->event_write(&__ctx, __ctf_tmp_string, \
670 __get_dynamic_len(dest)); \
671 }
672
673
674 #undef _ctf_enum
675 #define _ctf_enum(_provider, _name, _type, _item, _src, _nowrite) \
676 _ctf_integer_ext(_type, _item, _src, BYTE_ORDER, 10, _nowrite)
677
678 /* Beware: this get len actually consumes the len value */
679 #undef __get_dynamic_len
680 #define __get_dynamic_len(field) __stackvar.__dynamic_len[__dynamic_len_idx++]
681
682 #undef TP_ARGS
683 #define TP_ARGS(...) __VA_ARGS__
684
685 #undef TP_FIELDS
686 #define TP_FIELDS(...) __VA_ARGS__
687
688 /*
689 * For state dump, check that "session" argument (mandatory) matches the
690 * session this event belongs to. Ensures that we write state dump data only
691 * into the started session, not into all sessions.
692 */
693 #undef _TP_SESSION_CHECK
694 #ifdef TP_SESSION_CHECK
695 #define _TP_SESSION_CHECK(session, csession) (session == csession)
696 #else /* TP_SESSION_CHECK */
697 #define _TP_SESSION_CHECK(session, csession) 1
698 #endif /* TP_SESSION_CHECK */
699
700 /*
701 * Use of __builtin_return_address(0) sometimes seems to cause stack
702 * corruption on 32-bit PowerPC. Disable this feature on that
703 * architecture for now by always using the NULL value for the ip
704 * context.
705 */
706 #undef _TP_IP_PARAM
707 #ifdef TP_IP_PARAM
708 #define _TP_IP_PARAM(x) (x)
709 #else /* TP_IP_PARAM */
710
711 #if defined(__PPC__) && !defined(__PPC64__)
712 #define _TP_IP_PARAM(x) NULL
713 #else /* #if defined(__PPC__) && !defined(__PPC64__) */
714 #define _TP_IP_PARAM(x) __builtin_return_address(0)
715 #endif /* #else #if defined(__PPC__) && !defined(__PPC64__) */
716
717 #endif /* TP_IP_PARAM */
718
719 /*
720 * Using twice size for filter stack data to hold size and pointer for
721 * each field (worse case). For integers, max size required is 64-bit.
722 * Same for double-precision floats. Those fit within
723 * 2*sizeof(unsigned long) for all supported architectures.
724 * Perform UNION (||) of filter runtime list.
725 */
726 #undef TRACEPOINT_EVENT_CLASS
727 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
728 static lttng_ust_notrace \
729 void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args)); \
730 static \
731 void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args)) \
732 { \
733 struct lttng_event *__event = (struct lttng_event *) __tp_data; \
734 struct lttng_channel *__chan = __event->chan; \
735 struct lttng_ust_lib_ring_buffer_ctx __ctx; \
736 struct lttng_stack_ctx __lttng_ctx; \
737 size_t __event_len, __event_align; \
738 size_t __dynamic_len_idx = 0; \
739 union { \
740 size_t __dynamic_len[_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name) - 1]; \
741 char __filter_stack_data[2 * sizeof(unsigned long) * (_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name) - 1)]; \
742 } __stackvar; \
743 int __ret; \
744 \
745 if (0) \
746 (void) __dynamic_len_idx; /* don't warn if unused */ \
747 if (!_TP_SESSION_CHECK(session, __chan->session)) \
748 return; \
749 if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->session->active))) \
750 return; \
751 if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->enabled))) \
752 return; \
753 if (caa_unlikely(!CMM_ACCESS_ONCE(__event->enabled))) \
754 return; \
755 if (caa_unlikely(!TP_RCU_LINK_TEST())) \
756 return; \
757 if (caa_unlikely(!cds_list_empty(&__event->bytecode_runtime_head))) { \
758 struct lttng_bytecode_runtime *bc_runtime; \
759 int __filter_record = __event->has_enablers_without_bytecode; \
760 \
761 __event_prepare_filter_stack__##_provider##___##_name(__stackvar.__filter_stack_data, \
762 _TP_ARGS_DATA_VAR(_args)); \
763 tp_list_for_each_entry_rcu(bc_runtime, &__event->bytecode_runtime_head, node) { \
764 if (caa_unlikely(bc_runtime->filter(bc_runtime, \
765 __stackvar.__filter_stack_data) & LTTNG_FILTER_RECORD_FLAG)) \
766 __filter_record = 1; \
767 } \
768 if (caa_likely(!__filter_record)) \
769 return; \
770 } \
771 __event_len = __event_get_size__##_provider##___##_name(__stackvar.__dynamic_len, \
772 _TP_ARGS_DATA_VAR(_args)); \
773 __event_align = __event_get_align__##_provider##___##_name(_TP_ARGS_VAR(_args)); \
774 memset(&__lttng_ctx, 0, sizeof(__lttng_ctx)); \
775 __lttng_ctx.event = __event; \
776 __lttng_ctx.chan_ctx = tp_rcu_dereference_bp(__chan->ctx); \
777 __lttng_ctx.event_ctx = tp_rcu_dereference_bp(__event->ctx); \
778 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
779 __event_align, -1, __chan->handle, &__lttng_ctx); \
780 __ctx.ip = _TP_IP_PARAM(TP_IP_PARAM); \
781 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
782 if (__ret < 0) \
783 return; \
784 _fields \
785 __chan->ops->event_commit(&__ctx); \
786 }
787
788 #include TRACEPOINT_INCLUDE
789
790 #undef __get_dynamic_len
791
792 /*
793 * Stage 5.1 of tracepoint event generation.
794 *
795 * Create probe signature
796 */
797
798 /* Reset all macros within TRACEPOINT_EVENT */
799 #include <lttng/ust-tracepoint-event-reset.h>
800
801 #undef TP_ARGS
802 #define TP_ARGS(...) __VA_ARGS__
803
804 #define _TP_EXTRACT_STRING2(...) #__VA_ARGS__
805
806 #undef TRACEPOINT_EVENT_CLASS
807 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields) \
808 static const char __tp_event_signature___##_provider##___##_name[] = \
809 _TP_EXTRACT_STRING2(_args);
810
811 #include TRACEPOINT_INCLUDE
812
813 #undef _TP_EXTRACT_STRING2
814
815 /*
816 * Stage 6 of tracepoint event generation.
817 *
818 * Tracepoint loglevel mapping definition generation. We generate a
819 * symbol for each mapping for a provider/event to ensure at most a 1 to
820 * 1 mapping between events and loglevels. If the symbol is repeated,
821 * the compiler will complain.
822 */
823
824 /* Reset all macros within TRACEPOINT_EVENT */
825 #include <lttng/ust-tracepoint-event-reset.h>
826
827 #undef TRACEPOINT_LOGLEVEL
828 #define TRACEPOINT_LOGLEVEL(__provider, __name, __loglevel) \
829 static const int _loglevel_value___##__provider##___##__name = __loglevel; \
830 static const int *_loglevel___##__provider##___##__name = \
831 &_loglevel_value___##__provider##___##__name;
832
833 #include TRACEPOINT_INCLUDE
834
835 /*
836 * Stage 6.1 of tracepoint event generation.
837 *
838 * Tracepoint UML URI info.
839 */
840
841 /* Reset all macros within TRACEPOINT_EVENT */
842 #include <lttng/ust-tracepoint-event-reset.h>
843
844 #undef TRACEPOINT_MODEL_EMF_URI
845 #define TRACEPOINT_MODEL_EMF_URI(__provider, __name, __uri) \
846 static const char *_model_emf_uri___##__provider##___##__name = __uri;
847
848 #include TRACEPOINT_INCLUDE
849
850 /*
851 * Stage 7.1 of tracepoint event generation.
852 *
853 * Create events description structures. We use a weakref because
854 * loglevels are optional. If not declared, the event will point to the
855 * a loglevel that contains NULL.
856 */
857
858 /* Reset all macros within TRACEPOINT_EVENT */
859 #include <lttng/ust-tracepoint-event-reset.h>
860
861 #undef TRACEPOINT_EVENT_INSTANCE
862 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
863 static const int * \
864 __ref_loglevel___##_provider##___##_name \
865 __attribute__((weakref ("_loglevel___" #_provider "___" #_name))); \
866 static const char * \
867 __ref_model_emf_uri___##_provider##___##_name \
868 __attribute__((weakref ("_model_emf_uri___" #_provider "___" #_name)));\
869 static const struct lttng_event_desc __event_desc___##_provider##_##_name = { \
870 .name = #_provider ":" #_name, \
871 .probe_callback = (void (*)(void)) &__event_probe__##_provider##___##_template,\
872 .ctx = NULL, \
873 .fields = __event_fields___##_provider##___##_template, \
874 .nr_fields = _TP_ARRAY_SIZE(__event_fields___##_provider##___##_template) - 1, \
875 .loglevel = &__ref_loglevel___##_provider##___##_name, \
876 .signature = __tp_event_signature___##_provider##___##_template, \
877 .u = { \
878 .ext = { \
879 .model_emf_uri = &__ref_model_emf_uri___##_provider##___##_name, \
880 }, \
881 }, \
882 };
883
884 #include TRACEPOINT_INCLUDE
885
886 /*
887 * Stage 7.2 of tracepoint event generation.
888 *
889 * Create array of events.
890 */
891
892 /* Reset all macros within TRACEPOINT_EVENT */
893 #include <lttng/ust-tracepoint-event-reset.h>
894
895 #undef TRACEPOINT_EVENT_INSTANCE
896 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args) \
897 &__event_desc___##_provider##_##_name,
898
899 static const struct lttng_event_desc *_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)[] = {
900 #include TRACEPOINT_INCLUDE
901 NULL, /* Dummy, C99 forbids 0-len array. */
902 };
903
904
905 /*
906 * Stage 8 of tracepoint event generation.
907 *
908 * Create a toplevel descriptor for the whole probe.
909 */
910
911 /* non-const because list head will be modified when registered. */
912 static struct lttng_probe_desc _TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER) = {
913 .provider = __tp_stringify(TRACEPOINT_PROVIDER),
914 .event_desc = _TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER),
915 .nr_events = _TP_ARRAY_SIZE(_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)) - 1,
916 .head = { NULL, NULL },
917 .lazy_init_head = { NULL, NULL },
918 .lazy = 0,
919 .major = LTTNG_UST_PROVIDER_MAJOR,
920 .minor = LTTNG_UST_PROVIDER_MINOR,
921 };
922
923 static int _TP_COMBINE_TOKENS(__probe_register_refcount___, TRACEPOINT_PROVIDER);
924
925 /*
926 * Stage 9 of tracepoint event generation.
927 *
928 * Register/unregister probes at module load/unload.
929 *
930 * Generate the constructor as an externally visible symbol for use when
931 * linking the probe statically.
932 *
933 * Register refcount is protected by libc dynamic loader mutex.
934 */
935
936 /* Reset all macros within TRACEPOINT_EVENT */
937 #include <lttng/ust-tracepoint-event-reset.h>
938 static void lttng_ust_notrace __attribute__((constructor))
939 _TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void);
940 static void
941 _TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void)
942 {
943 int ret;
944
945 if (_TP_COMBINE_TOKENS(__probe_register_refcount___,
946 TRACEPOINT_PROVIDER)++) {
947 return;
948 }
949 /*
950 * __tracepoint_provider_check_ ## TRACEPOINT_PROVIDER() is a
951 * static inline function that ensures every probe PROVIDER
952 * argument match the provider within which they appear. It
953 * calls empty static inline functions, and therefore has no
954 * runtime effect. However, if it detects an error, a linker
955 * error will appear.
956 */
957 _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)();
958 ret = lttng_probe_register(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
959 if (ret) {
960 fprintf(stderr, "LTTng-UST: Error (%d) while registering tracepoint probe. Duplicate registration of tracepoint probes having the same name is not allowed.\n", ret);
961 abort();
962 }
963 }
964
965 static void lttng_ust_notrace __attribute__((destructor))
966 _TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void);
967 static void
968 _TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void)
969 {
970 if (--_TP_COMBINE_TOKENS(__probe_register_refcount___,
971 TRACEPOINT_PROVIDER)) {
972 return;
973 }
974 lttng_probe_unregister(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
975 }
976
977 int _TP_COMBINE_TOKENS(__tracepoint_provider_, TRACEPOINT_PROVIDER);
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