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