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
  15 #include <stdio.h>
  16 #include <urcu/compiler.h>
  17 #include <lttng/ust-events.h>
  18 #include <lttng/ringbuffer-config.h>
  19 #include <string.h>
  20
  21 /*
  22  * Macro declarations used for all stages.
  23  */
  24
  25 #undef ctf_integer
  26 #define ctf_integer(_type, _item, _src)                         \
  27         ctf_integer_ext(_type, _item, _src, BYTE_ORDER, 10)
  28
  29 #undef ctf_integer_hex
  30 #define ctf_integer_hex(_type, _item, _src)                     \
  31         ctf_integer_ext(_type, _item, _src, BYTE_ORDER, 16)
  32
  33 #undef ctf_integer_network
  34 #define ctf_integer_network(_type, _item, _src)                 \
  35         ctf_integer_ext(_type, _item, _src, BIG_ENDIAN, 10)
  36
  37 #undef ctf_integer_network_hex
  38 #define ctf_integer_network_hex(_type, _item, _src)             \
  39         ctf_integer_ext(_type, _item, _src, BIG_ENDIAN, 16)
  40
  41 /* ctf_float is redefined at each step */
  42
  43 #undef ctf_array
  44 #define ctf_array(_type, _item, _src, _length)                  \
  45         ctf_array_encoded(_type, _item, _src, _length, none)
  46
  47 #undef ctf_array_text
  48 #define ctf_array_text(_type, _item, _src, _length)             \
  49         ctf_array_encoded(_type, _item, _src, _length, UTF8)
  50
  51 #undef ctf_sequence
  52 #define ctf_sequence(_type, _item, _src, _length_type, _src_length)     \
  53         ctf_sequence_encoded(_type, _item, _src,                        \
  54                         _length_type, _src_length, none)
  55
  56 #undef ctf_sequence_text
  57 #define ctf_sequence_text(_type, _item, _src, _length_type, _src_length) \
  58         ctf_sequence_encoded(_type, _item, _src,                         \
  59                         _length_type, _src_length, UTF8)
  60
  61 /* ctf_string is redefined at each step */
  62
  63 /*
  64  * TRACEPOINT_EVENT_CLASS declares a class of tracepoints receiving the
  65  * same arguments and having the same field layout.
  66  *
  67  * TRACEPOINT_EVENT_INSTANCE declares an instance of a tracepoint, with
  68  * its own provider and name. It refers to a class (template).
  69  *
  70  * TRACEPOINT_EVENT declared both a class and an instance and does a
  71  * direct mapping from the instance to the class.
  72  */
  73
  74 #undef TRACEPOINT_EVENT
  75 #define TRACEPOINT_EVENT(_provider, _name, _args, _fields)      \
  76         TRACEPOINT_EVENT_CLASS(_provider, _name,                \
  77                          _TP_PARAMS(_args),                     \
  78                          _TP_PARAMS(_fields))                   \
  79         TRACEPOINT_EVENT_INSTANCE(_provider, _name, _name,      \
  80                          _TP_PARAMS(_args))
  81
  82 /* Helpers */
  83 #define _TP_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  84
  85 #define _tp_max_t(type, x, y)                           \
  86         ({                                              \
  87                 type __max1 = (x);                      \
  88                 type __max2 = (y);                      \
  89                 __max1 > __max2 ? __max1: __max2;       \
  90         })
  91
  92 /*
  93  * Stage 0 of tracepoint event generation.
  94  *
  95  * Check that each TRACEPOINT_EVENT provider argument match the
  96  * TRACEPOINT_PROVIDER by creating dummy callbacks.
  97  */
  98
  99 /* Reset all macros within TRACEPOINT_EVENT */
 100 #include <lttng/ust-tracepoint-event-reset.h>
 101
 102 static inline
 103 void _TP_COMBINE_TOKENS(__tracepoint_provider_mismatch_, TRACEPOINT_PROVIDER)(void)
 104 {
 105 }
 106
 107 #undef TRACEPOINT_EVENT_CLASS
 108 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)        \
 109         __tracepoint_provider_mismatch_##_provider();
 110
 111 #undef TRACEPOINT_EVENT_INSTANCE
 112 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args)   \
 113         __tracepoint_provider_mismatch_##_provider();
 114
 115 static __attribute__((unused))
 116 void _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)(void)
 117 {
 118 #include TRACEPOINT_INCLUDE
 119 }
 120
 121 /*
 122  * Stage 0.1 of tracepoint event generation.
 123  *
 124  * Check that each TRACEPOINT_EVENT provider:name does not exceed the
 125  * tracepoint name length limit.
 126  */
 127
 128 /* Reset all macros within TRACEPOINT_EVENT */
 129 #include <lttng/ust-tracepoint-event-reset.h>
 130
 131 #undef TRACEPOINT_EVENT_INSTANCE
 132 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args)   \
 133 static const char                                                       \
 134         __tp_name_len_check##_provider##___##_name[LTTNG_UST_SYM_NAME_LEN] \
 135         __attribute__((unused)) =                                       \
 136                 #_provider ":" #_name;
 137
 138 #include TRACEPOINT_INCLUDE
 139
 140 /*
 141  * Stage 1 of tracepoint event generation.
 142  *
 143  * Create event field type metadata section.
 144  * Each event produce an array of fields.
 145  */
 146
 147 /* Reset all macros within TRACEPOINT_EVENT */
 148 #include <lttng/ust-tracepoint-event-reset.h>
 149
 150 #undef ctf_integer_ext
 151 #define ctf_integer_ext(_type, _item, _src, _byte_order, _base) \
 152         {                                                       \
 153           .name = #_item,                                       \
 154           .type = __type_integer(_type, _byte_order, _base, none),\
 155         },
 156
 157 #undef ctf_float
 158 #define ctf_float(_type, _item, _src)                           \
 159         {                                                       \
 160           .name = #_item,                                       \
 161           .type = __type_float(_type),                          \
 162         },
 163
 164 #undef ctf_array_encoded
 165 #define ctf_array_encoded(_type, _item, _src, _length, _encoding) \
 166         {                                                       \
 167           .name = #_item,                                       \
 168           .type =                                               \
 169                 {                                               \
 170                   .atype = atype_array,                         \
 171                   .u.array =                                    \
 172                         {                                       \
 173                             .length = _length,                  \
 174                             .elem_type = __type_integer(_type, BYTE_ORDER, 10, _encoding), \
 175                         },                                      \
 176                 },                                              \
 177         },
 178
 179 #undef ctf_sequence_encoded
 180 #define ctf_sequence_encoded(_type, _item, _src,        \
 181                         _length_type, _src_length, _encoding)   \
 182         {                                                       \
 183           .name = #_item,                                       \
 184           .type =                                               \
 185                 {                                               \
 186                   .atype = atype_sequence,                      \
 187                   .u.sequence =                                 \
 188                         {                                       \
 189                             .length_type = __type_integer(_length_type, BYTE_ORDER, 10, none), \
 190                             .elem_type = __type_integer(_type, BYTE_ORDER, 10, _encoding), \
 191                         },                                      \
 192                 },                                              \
 193         },
 194
 195 #undef ctf_string
 196 #define ctf_string(_item, _src)                                 \
 197         {                                                       \
 198           .name = #_item,                                       \
 199           .type =                                               \
 200                 {                                               \
 201                   .atype = atype_string,                        \
 202                   .u.basic.string.encoding = lttng_encode_UTF8, \
 203                 },                                              \
 204         },
 205
 206 #undef TP_FIELDS
 207 #define TP_FIELDS(...) __VA_ARGS__      /* Only one used in this phase */
 208
 209 #undef TRACEPOINT_EVENT_CLASS
 210 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)                             \
 211         static const struct lttng_event_field __event_fields___##_provider##___##_name[] = { \
 212                 _fields                                                                      \
 213         };
 214
 215 #include TRACEPOINT_INCLUDE
 216
 217 /*
 218  * Stage 2 of tracepoint event generation.
 219  *
 220  * Create probe callback prototypes.
 221  */
 222
 223 /* Reset all macros within TRACEPOINT_EVENT */
 224 #include <lttng/ust-tracepoint-event-reset.h>
 225
 226 #undef TP_ARGS
 227 #define TP_ARGS(...) __VA_ARGS__
 228
 229 #undef TRACEPOINT_EVENT_CLASS
 230 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)                \
 231 static void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args));
 232
 233 #include TRACEPOINT_INCLUDE
 234
 235 /*
 236  * Stage 3 of tracepoint event generation.
 237  *
 238  * Create static inline function that calculates event size.
 239  */
 240
 241 /* Reset all macros within TRACEPOINT_EVENT */
 242 #include <lttng/ust-tracepoint-event-reset.h>
 243
 244 #undef ctf_integer_ext
 245 #define ctf_integer_ext(_type, _item, _src, _byte_order, _base)                \
 246         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 247         __event_len += sizeof(_type);
 248
 249 #undef ctf_float
 250 #define ctf_float(_type, _item, _src)                                          \
 251         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 252         __event_len += sizeof(_type);
 253
 254 #undef ctf_array_encoded
 255 #define ctf_array_encoded(_type, _item, _src, _length, _encoding)              \
 256         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 257         __event_len += sizeof(_type) * (_length);
 258
 259 #undef ctf_sequence_encoded
 260 #define ctf_sequence_encoded(_type, _item, _src, _length_type,  \
 261                         _src_length, _encoding)                 \
 262         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_length_type));   \
 263         __event_len += sizeof(_length_type);                                   \
 264         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 265         __dynamic_len[__dynamic_len_idx] = (_src_length);                      \
 266         __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx];       \
 267         __dynamic_len_idx++;
 268
 269 #undef ctf_string
 270 #define ctf_string(_item, _src)                                                \
 271         __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
 272
 273 #undef TP_ARGS
 274 #define TP_ARGS(...) __VA_ARGS__
 275
 276 #undef TP_FIELDS
 277 #define TP_FIELDS(...) __VA_ARGS__
 278
 279 #undef TRACEPOINT_EVENT_CLASS
 280 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)      \
 281 static inline size_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  */
 299
 300 /* Reset all macros within TRACEPOINT_EVENT */
 301 #include <lttng/ust-tracepoint-event-reset.h>
 302
 303 #undef ctf_integer_ext
 304 #define ctf_integer_ext(_type, _item, _src, _byte_order, _base)                \
 305         if (lttng_is_signed_type(_type))                                       \
 306                 *(int64_t *) __stack_data = (int64_t) (_type) (_src);          \
 307         else                                                                   \
 308                 *(uint64_t *) __stack_data = (uint64_t) (_type) (_src);        \
 309         __stack_data += sizeof(int64_t);
 310
 311 #undef ctf_float
 312 #define ctf_float(_type, _item, _src)                                          \
 313         *(double *) __stack_data = (double) (_type) (_src);                    \
 314         __stack_data += sizeof(double);
 315
 316 #undef ctf_array_encoded
 317 #define ctf_array_encoded(_type, _item, _src, _length, _encoding)              \
 318         *(unsigned long *) __stack_data = (unsigned long) (_length);           \
 319         __stack_data += sizeof(unsigned long);                                 \
 320         *(const void **) __stack_data = (_src);                                \
 321         __stack_data += sizeof(void *);
 322
 323 #undef ctf_sequence_encoded
 324 #define ctf_sequence_encoded(_type, _item, _src, _length_type,                 \
 325                         _src_length, _encoding)                                \
 326         *(unsigned long *) __stack_data = (unsigned long) (_src_length);       \
 327         __stack_data += sizeof(unsigned long);                                 \
 328         *(const void **) __stack_data = (_src);                                \
 329         __stack_data += sizeof(void *);
 330
 331 #undef ctf_string
 332 #define ctf_string(_item, _src)                                                \
 333         *(const void **) __stack_data = (_src);                                \
 334         __stack_data += sizeof(void *);
 335
 336 #undef TP_ARGS
 337 #define TP_ARGS(...) __VA_ARGS__
 338
 339 #undef TP_FIELDS
 340 #define TP_FIELDS(...) __VA_ARGS__
 341
 342 #undef TRACEPOINT_EVENT_CLASS
 343 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)              \
 344 static inline                                                                 \
 345 void __event_prepare_filter_stack__##_provider##___##_name(char *__stack_data,\
 346                                                  _TP_ARGS_DATA_PROTO(_args))  \
 347 {                                                                             \
 348         _fields                                                               \
 349 }
 350
 351 #include TRACEPOINT_INCLUDE
 352
 353
 354
 355 /*
 356  * Stage 4 of tracepoint event generation.
 357  *
 358  * Create static inline function that calculates event payload alignment.
 359  */
 360
 361 /* Reset all macros within TRACEPOINT_EVENT */
 362 #include <lttng/ust-tracepoint-event-reset.h>
 363
 364 #undef ctf_integer_ext
 365 #define ctf_integer_ext(_type, _item, _src, _byte_order, _base)                \
 366         __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
 367
 368 #undef ctf_float
 369 #define ctf_float(_type, _item, _src)                                          \
 370         __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
 371
 372 #undef ctf_array_encoded
 373 #define ctf_array_encoded(_type, _item, _src, _length, _encoding)              \
 374         __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
 375
 376 #undef ctf_sequence_encoded
 377 #define ctf_sequence_encoded(_type, _item, _src, _length_type,  \
 378                         _src_length, _encoding)                 \
 379         __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_length_type));    \
 380         __event_align = _tp_max_t(size_t, __event_align, lttng_alignof(_type));
 381
 382 #undef ctf_string
 383 #define ctf_string(_item, _src)
 384
 385 #undef TP_ARGS
 386 #define TP_ARGS(...) __VA_ARGS__
 387
 388 #undef TP_FIELDS
 389 #define TP_FIELDS(...) __VA_ARGS__
 390
 391 #undef TRACEPOINT_EVENT_CLASS
 392 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)              \
 393 static inline                                                                 \
 394 size_t __event_get_align__##_provider##___##_name(_TP_ARGS_PROTO(_args))      \
 395 {                                                                             \
 396         size_t __event_align = 1;                                             \
 397         _fields                                                               \
 398         return __event_align;                                                 \
 399 }
 400
 401 #include TRACEPOINT_INCLUDE
 402
 403
 404 /*
 405  * Stage 5 of tracepoint event generation.
 406  *
 407  * Create the probe function. This function calls event size calculation
 408  * and writes event data into the buffer.
 409  */
 410
 411 /* Reset all macros within TRACEPOINT_EVENT */
 412 #include <lttng/ust-tracepoint-event-reset.h>
 413
 414 #undef ctf_integer_ext
 415 #define ctf_integer_ext(_type, _item, _src, _byte_order, _base)         \
 416         {                                                               \
 417                 _type __tmp = (_src);                                   \
 418                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
 419                 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
 420         }
 421
 422 #undef ctf_float
 423 #define ctf_float(_type, _item, _src)                                   \
 424         {                                                               \
 425                 _type __tmp = (_src);                                   \
 426                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
 427                 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
 428         }
 429
 430 #undef ctf_array_encoded
 431 #define ctf_array_encoded(_type, _item, _src, _length, _encoding)       \
 432         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type));        \
 433         __chan->ops->event_write(&__ctx, _src, sizeof(_type) * (_length));
 434
 435 #undef ctf_sequence_encoded
 436 #define ctf_sequence_encoded(_type, _item, _src, _length_type,          \
 437                         _src_length, _encoding)                 \
 438         {                                                               \
 439                 _length_type __tmpl = __stackvar.__dynamic_len[__dynamic_len_idx]; \
 440                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_length_type));\
 441                 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(_length_type));\
 442         }                                                               \
 443         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type));        \
 444         __chan->ops->event_write(&__ctx, _src,                          \
 445                 sizeof(_type) * __get_dynamic_len(dest));
 446
 447 #undef ctf_string
 448 #define ctf_string(_item, _src)                                         \
 449         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(*(_src)));      \
 450         __chan->ops->event_write(&__ctx, _src, __get_dynamic_len(dest));
 451
 452 /* Beware: this get len actually consumes the len value */
 453 #undef __get_dynamic_len
 454 #define __get_dynamic_len(field)        __stackvar.__dynamic_len[__dynamic_len_idx++]
 455
 456 #undef TP_ARGS
 457 #define TP_ARGS(...) __VA_ARGS__
 458
 459 #undef TP_FIELDS
 460 #define TP_FIELDS(...) __VA_ARGS__
 461
 462 /*
 463  * Using twice size for filter stack data to hold size and pointer for
 464  * each field (worse case). For integers, max size required is 64-bit.
 465  * Same for double-precision floats. Those fit within
 466  * 2*sizeof(unsigned long) for all supported architectures.
 467  */
 468 #undef TRACEPOINT_EVENT_CLASS
 469 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)              \
 470 static void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args))\
 471 {                                                                             \
 472         struct ltt_event *__event = __tp_data;                                \
 473         struct ltt_channel *__chan = __event->chan;                           \
 474         struct lttng_ust_lib_ring_buffer_ctx __ctx;                           \
 475         size_t __event_len, __event_align;                                    \
 476         size_t __dynamic_len_idx = 0;                                         \
 477         union {                                                               \
 478                 size_t __dynamic_len[_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name)]; \
 479                 char __filter_stack_data[2 * sizeof(unsigned long) * _TP_ARRAY_SIZE(__event_fields___##_provider##___##_name)]; \
 480         } __stackvar;                                                         \
 481         int __ret;                                                            \
 482                                                                               \
 483         if (0)                                                                \
 484                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 485         if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->session->active)))          \
 486                 return;                                                       \
 487         if (caa_unlikely(!CMM_ACCESS_ONCE(__chan->enabled)))                  \
 488                 return;                                                       \
 489         if (caa_unlikely(!CMM_ACCESS_ONCE(__event->enabled)))                 \
 490                 return;                                                       \
 491         if (caa_unlikely(__event->filter)) {                                  \
 492                 __event_prepare_filter_stack__##_provider##___##_name(__stackvar.__filter_stack_data, \
 493                         _TP_ARGS_DATA_VAR(_args));                                    \
 494                 if (caa_likely(!__event->filter(__event->filter_data, __stackvar.__filter_stack_data))) \
 495                         return;                                               \
 496         }                                                                     \
 497         __event_len = __event_get_size__##_provider##___##_name(__stackvar.__dynamic_len, \
 498                  _TP_ARGS_DATA_VAR(_args));                                   \
 499         __event_align = __event_get_align__##_provider##___##_name(_TP_ARGS_VAR(_args)); \
 500         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 501                                  __event_align, -1, __chan->handle);          \
 502         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 503         if (__ret < 0)                                                        \
 504                 return;                                                       \
 505         _fields                                                               \
 506         __chan->ops->event_commit(&__ctx);                                    \
 507 }
 508
 509 #include TRACEPOINT_INCLUDE
 510
 511 #undef __get_dynamic_len
 512
 513 /*
 514  * Stage 5.1 of tracepoint event generation.
 515  *
 516  * Create probe signature
 517  */
 518
 519 /* Reset all macros within TRACEPOINT_EVENT */
 520 #include <lttng/ust-tracepoint-event-reset.h>
 521
 522 #undef TP_ARGS
 523 #define TP_ARGS(...) __VA_ARGS__
 524
 525 #define _TP_EXTRACT_STRING2(...)        #__VA_ARGS__
 526
 527 #undef TRACEPOINT_EVENT_CLASS
 528 #define TRACEPOINT_EVENT_CLASS(_provider, _name, _args, _fields)        \
 529 const char __tp_event_signature___##_provider##___##_name[] =           \
 530                 _TP_EXTRACT_STRING2(_args);
 531
 532 #include TRACEPOINT_INCLUDE
 533
 534 #undef _TP_EXTRACT_STRING2
 535
 536 /*
 537  * Stage 6 of tracepoint event generation.
 538  *
 539  * Tracepoint loglevel mapping definition generation. We generate a
 540  * symbol for each mapping for a provider/event to ensure at most a 1 to
 541  * 1 mapping between events and loglevels. If the symbol is repeated,
 542  * the compiler will complain.
 543  */
 544
 545 /* Reset all macros within TRACEPOINT_EVENT */
 546 #include <lttng/ust-tracepoint-event-reset.h>
 547
 548 #undef TRACEPOINT_LOGLEVEL
 549 #define TRACEPOINT_LOGLEVEL(__provider, __name, __loglevel)                \
 550 static const int _loglevel_value___##__provider##___##__name = __loglevel; \
 551 static const int *_loglevel___##__provider##___##__name =                  \
 552                 &_loglevel_value___##__provider##___##__name;
 553
 554 #include TRACEPOINT_INCLUDE
 555
 556 /*
 557  * Stage 7.1 of tracepoint event generation.
 558  *
 559  * Create events description structures. We use a weakref because
 560  * loglevels are optional. If not declared, the event will point to the
 561  * a loglevel that contains NULL.
 562  */
 563
 564 /* Reset all macros within TRACEPOINT_EVENT */
 565 #include <lttng/ust-tracepoint-event-reset.h>
 566
 567 #undef TRACEPOINT_EVENT_INSTANCE
 568 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args)          \
 569 static const int *                                                             \
 570         __ref_loglevel___##_provider##___##_name                               \
 571         __attribute__((weakref ("_loglevel___" #_provider "___" #_name)));     \
 572 const struct lttng_event_desc __event_desc___##_provider##_##_name = {         \
 573         .fields = __event_fields___##_provider##___##_template,                \
 574         .name = #_provider ":" #_name,                                         \
 575         .probe_callback = (void (*)(void)) &__event_probe__##_provider##___##_template,\
 576         .nr_fields = _TP_ARRAY_SIZE(__event_fields___##_provider##___##_template), \
 577         .loglevel = &__ref_loglevel___##_provider##___##_name,                 \
 578         .signature = __tp_event_signature___##_provider##___##_template,       \
 579 };
 580
 581 #include TRACEPOINT_INCLUDE
 582
 583 /*
 584  * Stage 7.2 of tracepoint event generation.
 585  *
 586  * Create array of events.
 587  */
 588
 589 /* Reset all macros within TRACEPOINT_EVENT */
 590 #include <lttng/ust-tracepoint-event-reset.h>
 591
 592 #undef TRACEPOINT_EVENT_INSTANCE
 593 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args)          \
 594         &__event_desc___##_provider##_##_name,
 595
 596 static const struct lttng_event_desc *_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)[] = {
 597 #include TRACEPOINT_INCLUDE
 598 };
 599
 600
 601 /*
 602  * Stage 8 of tracepoint event generation.
 603  *
 604  * Create a toplevel descriptor for the whole probe.
 605  */
 606
 607 /* non-const because list head will be modified when registered. */
 608 static struct lttng_probe_desc _TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER) = {
 609         .provider = __tp_stringify(TRACEPOINT_PROVIDER),
 610         .event_desc = _TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER),
 611         .nr_events = _TP_ARRAY_SIZE(_TP_COMBINE_TOKENS(__event_desc___, TRACEPOINT_PROVIDER)),
 612 };
 613
 614 /*
 615  * Stage 9 of tracepoint event generation.
 616  *
 617  * Register/unregister probes at module load/unload.
 618  *
 619  * Generate the constructor as an externally visible symbol for use when
 620  * linking the probe statically.
 621  */
 622
 623 /* Reset all macros within TRACEPOINT_EVENT */
 624 #include <lttng/ust-tracepoint-event-reset.h>
 625 static void __attribute__((constructor))
 626 _TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void)
 627 {
 628         int ret;
 629
 630         ret = ltt_probe_register(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
 631         assert(!ret);
 632 }
 633
 634 static void __attribute__((destructor))
 635 _TP_COMBINE_TOKENS(__lttng_events_exit__, TRACEPOINT_PROVIDER)(void)
 636 {
 637         ltt_probe_unregister(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
 638 }
 639
 640 int _TP_COMBINE_TOKENS(__tracepoint_provider_, TRACEPOINT_PROVIDER);