include/side/trace.h

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2022 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  */
   5
   6 #ifndef _SIDE_TRACE_H
   7 #define _SIDE_TRACE_H
   8
   9 #include <stdint.h>
  10 #include <inttypes.h>
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <side/macros.h>
  14
  15 /* SIDE stands for "Static Instrumentation Dynamically Enabled" */
  16
  17 struct side_arg_vec;
  18 struct side_arg_vec_description;
  19 struct side_arg_dynamic_vec;
  20 struct side_arg_dynamic_vec_vla;
  21 struct side_type_description;
  22 struct side_event_field;
  23 struct side_tracer_visitor_ctx;
  24 struct side_tracer_dynamic_struct_visitor_ctx;
  25 struct side_tracer_dynamic_vla_visitor_ctx;
  26
  27 enum side_type {
  28         SIDE_TYPE_BOOL,
  29
  30         SIDE_TYPE_U8,
  31         SIDE_TYPE_U16,
  32         SIDE_TYPE_U32,
  33         SIDE_TYPE_U64,
  34         SIDE_TYPE_S8,
  35         SIDE_TYPE_S16,
  36         SIDE_TYPE_S32,
  37         SIDE_TYPE_S64,
  38
  39         SIDE_TYPE_STRING,
  40
  41         SIDE_TYPE_STRUCT,
  42         SIDE_TYPE_ARRAY,
  43         SIDE_TYPE_VLA,
  44         SIDE_TYPE_VLA_VISITOR,
  45
  46         SIDE_TYPE_ARRAY_U8,
  47         SIDE_TYPE_ARRAY_U16,
  48         SIDE_TYPE_ARRAY_U32,
  49         SIDE_TYPE_ARRAY_U64,
  50         SIDE_TYPE_ARRAY_S8,
  51         SIDE_TYPE_ARRAY_S16,
  52         SIDE_TYPE_ARRAY_S32,
  53         SIDE_TYPE_ARRAY_S64,
  54
  55         SIDE_TYPE_VLA_U8,
  56         SIDE_TYPE_VLA_U16,
  57         SIDE_TYPE_VLA_U32,
  58         SIDE_TYPE_VLA_U64,
  59         SIDE_TYPE_VLA_S8,
  60         SIDE_TYPE_VLA_S16,
  61         SIDE_TYPE_VLA_S32,
  62         SIDE_TYPE_VLA_S64,
  63
  64         SIDE_TYPE_DYNAMIC,
  65 };
  66
  67 enum side_dynamic_type {
  68         SIDE_DYNAMIC_TYPE_NULL,
  69
  70         SIDE_DYNAMIC_TYPE_BOOL,
  71
  72         SIDE_DYNAMIC_TYPE_U8,
  73         SIDE_DYNAMIC_TYPE_U16,
  74         SIDE_DYNAMIC_TYPE_U32,
  75         SIDE_DYNAMIC_TYPE_U64,
  76         SIDE_DYNAMIC_TYPE_S8,
  77         SIDE_DYNAMIC_TYPE_S16,
  78         SIDE_DYNAMIC_TYPE_S32,
  79         SIDE_DYNAMIC_TYPE_S64,
  80
  81         SIDE_DYNAMIC_TYPE_STRING,
  82
  83         SIDE_DYNAMIC_TYPE_STRUCT,
  84         SIDE_DYNAMIC_TYPE_STRUCT_VISITOR,
  85
  86         SIDE_DYNAMIC_TYPE_VLA,
  87         SIDE_DYNAMIC_TYPE_VLA_VISITOR,
  88 };
  89
  90 enum side_loglevel {
  91         SIDE_LOGLEVEL_EMERG = 0,
  92         SIDE_LOGLEVEL_ALERT = 1,
  93         SIDE_LOGLEVEL_CRIT = 2,
  94         SIDE_LOGLEVEL_ERR = 3,
  95         SIDE_LOGLEVEL_WARNING = 4,
  96         SIDE_LOGLEVEL_NOTICE = 5,
  97         SIDE_LOGLEVEL_INFO = 6,
  98         SIDE_LOGLEVEL_DEBUG = 7,
  99 };
 100
 101 enum side_visitor_status {
 102         SIDE_VISITOR_STATUS_OK = 0,
 103         SIDE_VISITOR_STATUS_ERROR = -1,
 104 };
 105
 106 typedef enum side_visitor_status (*side_visitor)(
 107                 const struct side_tracer_visitor_ctx *tracer_ctx,
 108                 void *app_ctx);
 109 typedef enum side_visitor_status (*side_dynamic_struct_visitor)(
 110                 const struct side_tracer_dynamic_struct_visitor_ctx *tracer_ctx,
 111                 void *app_ctx);
 112 typedef enum side_visitor_status (*side_dynamic_vla_visitor)(
 113                 const struct side_tracer_dynamic_vla_visitor_ctx *tracer_ctx,
 114                 void *app_ctx);
 115
 116 /* User attributes. */
 117 struct side_attr {
 118         const char *key;
 119         const char *value;
 120 };
 121
 122 struct side_type_description {
 123         uint32_t type;  /* enum side_type */
 124         //TODO: we should add something like a list of user attributes (namespaced strings)
 125         union {
 126                 struct {
 127                         uint32_t nr_fields;
 128                         const struct side_event_field *fields;
 129                 } side_struct;
 130                 struct {
 131                         uint32_t length;
 132                         const struct side_type_description *elem_type;
 133                 } side_array;
 134                 struct {
 135                         const struct side_type_description *elem_type;
 136                 } side_vla;
 137                 struct {
 138                         const struct side_type_description *elem_type;
 139                         side_visitor visitor;
 140                 } side_vla_visitor;
 141         } u;
 142 };
 143
 144 struct side_event_field {
 145         const char *field_name;
 146         struct side_type_description side_type;
 147 };
 148
 149 enum side_event_flags {
 150         SIDE_EVENT_FLAG_VARIADIC = (1 << 0),
 151 };
 152
 153 struct side_event_description {
 154         uint32_t version;
 155         uint32_t enabled;
 156         uint32_t loglevel;      /* enum side_loglevel */
 157         uint32_t nr_fields;
 158         uint32_t nr_attr;
 159         uint32_t _unused;
 160         uint64_t flags;
 161         const char *provider_name;
 162         const char *event_name;
 163         const struct side_event_field *fields;
 164         const struct side_attr *attr;
 165 };
 166
 167 struct side_arg_dynamic_vec_vla {
 168         const struct side_arg_dynamic_vec *sav;
 169         uint32_t len;
 170 };
 171
 172 struct side_arg_dynamic_vec {
 173         uint32_t dynamic_type;  /* enum side_dynamic_type */
 174         union {
 175                 uint8_t side_bool;
 176
 177                 uint8_t side_u8;
 178                 uint16_t side_u16;
 179                 uint32_t side_u32;
 180                 uint64_t side_u64;
 181                 int8_t side_s8;
 182                 int16_t side_s16;
 183                 int32_t side_s32;
 184                 int64_t side_s64;
 185
 186                 const char *string;
 187
 188                 const struct side_arg_dynamic_event_struct *side_dynamic_struct;
 189                 struct {
 190                         void *app_ctx;
 191                         side_dynamic_struct_visitor visitor;
 192                 } side_dynamic_struct_visitor;
 193
 194                 const struct side_arg_dynamic_vec_vla *side_dynamic_vla;
 195                 struct {
 196                         void *app_ctx;
 197                         side_dynamic_vla_visitor visitor;
 198                 } side_dynamic_vla_visitor;
 199         } u;
 200 };
 201
 202 struct side_arg_dynamic_event_field {
 203         const char *field_name;
 204         const struct side_arg_dynamic_vec elem;
 205         //TODO: we should add something like a list of user attributes (namespaced strings)
 206 };
 207
 208 struct side_arg_dynamic_event_struct {
 209         const struct side_arg_dynamic_event_field *fields;
 210         uint32_t len;
 211 };
 212
 213 struct side_arg_vec {
 214         enum side_type type;
 215         union {
 216                 uint8_t side_bool;
 217
 218                 uint8_t side_u8;
 219                 uint16_t side_u16;
 220                 uint32_t side_u32;
 221                 uint64_t side_u64;
 222                 int8_t side_s8;
 223                 int16_t side_s16;
 224                 int32_t side_s32;
 225                 int64_t side_s64;
 226
 227                 const char *string;
 228                 const struct side_arg_vec_description *side_struct;
 229                 const struct side_arg_vec_description *side_array;
 230                 const struct side_arg_vec_description *side_vla;
 231                 void *side_vla_app_visitor_ctx;
 232
 233                 void *side_array_fixint;
 234                 struct {
 235                         void *p;
 236                         uint32_t length;
 237                 } side_vla_fixint;
 238
 239                 struct side_arg_dynamic_vec dynamic;
 240         } u;
 241 };
 242
 243 struct side_arg_vec_description {
 244         const struct side_arg_vec *sav;
 245         uint32_t len;
 246 };
 247
 248 /* The visitor pattern is a double-dispatch visitor. */
 249 struct side_tracer_visitor_ctx {
 250         enum side_visitor_status (*write_elem)(
 251                         const struct side_tracer_visitor_ctx *tracer_ctx,
 252                         const struct side_arg_vec *elem);
 253         void *priv;             /* Private tracer context. */
 254 };
 255
 256 struct side_tracer_dynamic_struct_visitor_ctx {
 257         enum side_visitor_status (*write_field)(
 258                         const struct side_tracer_dynamic_struct_visitor_ctx *tracer_ctx,
 259                         const struct side_arg_dynamic_event_field *dynamic_field);
 260         void *priv;             /* Private tracer context. */
 261 };
 262
 263 struct side_tracer_dynamic_vla_visitor_ctx {
 264         enum side_visitor_status (*write_elem)(
 265                         const struct side_tracer_dynamic_vla_visitor_ctx *tracer_ctx,
 266                         const struct side_arg_dynamic_vec *elem);
 267         void *priv;             /* Private tracer context. */
 268 };
 269
 270 #define side_attr(_key, _value) \
 271         { \
 272                 .key = _key, \
 273                 .value = _value, \
 274         }
 275
 276 #define side_attr_list(...) \
 277         SIDE_COMPOUND_LITERAL(const struct side_attr, __VA_ARGS__)
 278
 279 #define side_type_decl(_type)           { .type = _type }
 280
 281 #define side_field(_name, _type) \
 282         { \
 283                 .field_name = _name, \
 284                 .side_type = side_type_decl(_type), \
 285         }
 286
 287 #define side_type_struct_decl(_fields) \
 288         { \
 289                 .type = SIDE_TYPE_STRUCT, \
 290                 .u = { \
 291                         .side_struct = { \
 292                                 .nr_fields = SIDE_ARRAY_SIZE(SIDE_PARAM(_fields)), \
 293                                 .fields = _fields, \
 294                         }, \
 295                 }, \
 296         }
 297 #define side_field_struct(_name, _fields) \
 298         { \
 299                 .field_name = _name, \
 300                 .side_type = side_type_struct_decl(SIDE_PARAM(_fields)), \
 301         }
 302
 303 #define side_type_array_decl(_elem_type, _length) \
 304         { \
 305                 .type = SIDE_TYPE_ARRAY, \
 306                 .u = { \
 307                         .side_array = { \
 308                                 .length = _length, \
 309                                 .elem_type = _elem_type, \
 310                         }, \
 311                 }, \
 312         }
 313 #define side_field_array(_name, _elem_type, _length) \
 314         { \
 315                 .field_name = _name, \
 316                 .side_type = side_type_array_decl(_elem_type, _length), \
 317         }
 318
 319 #define side_type_vla_decl(_elem_type) \
 320         { \
 321                 .type = SIDE_TYPE_VLA, \
 322                 .u = { \
 323                         .side_vla = { \
 324                                 .elem_type = _elem_type, \
 325                         }, \
 326                 }, \
 327         }
 328 #define side_field_vla(_name, _elem_type) \
 329         { \
 330                 .field_name = _name, \
 331                 .side_type = side_type_vla_decl(_elem_type), \
 332         }
 333
 334 #define side_type_vla_visitor_decl(_elem_type, _visitor) \
 335         { \
 336                 .type = SIDE_TYPE_VLA_VISITOR, \
 337                 .u = { \
 338                         .side_vla_visitor = { \
 339                                 .elem_type = SIDE_PARAM(_elem_type), \
 340                                 .visitor = _visitor, \
 341                         }, \
 342                 }, \
 343         }
 344 #define side_field_vla_visitor(_name, _elem_type, _visitor) \
 345         { \
 346                 .field_name = _name, \
 347                 .side_type = side_type_vla_visitor_decl(SIDE_PARAM(_elem_type), _visitor), \
 348         }
 349
 350 #define side_elem(...) \
 351         SIDE_COMPOUND_LITERAL(const struct side_type_description, __VA_ARGS__)
 352
 353 #define side_elem_type(...) \
 354         side_elem(side_type_decl(__VA_ARGS__))
 355
 356 #define side_field_list(...) \
 357         SIDE_COMPOUND_LITERAL(const struct side_event_field, __VA_ARGS__)
 358
 359 #define side_arg_bool(val)              { .type = SIDE_TYPE_BOOL, .u = { .side_bool = !!(val) } }
 360 #define side_arg_u8(val)                { .type = SIDE_TYPE_U8, .u = { .side_u8 = (val) } }
 361 #define side_arg_u16(val)               { .type = SIDE_TYPE_U16, .u = { .side_u16 = (val) } }
 362 #define side_arg_u32(val)               { .type = SIDE_TYPE_U32, .u = { .side_u32 = (val) } }
 363 #define side_arg_u64(val)               { .type = SIDE_TYPE_U64, .u = { .side_u64 = (val) } }
 364 #define side_arg_s8(val)                { .type = SIDE_TYPE_S8, .u = { .side_s8 = (val) } }
 365 #define side_arg_s16(val)               { .type = SIDE_TYPE_S16, .u = { .side_s16 = (val) } }
 366 #define side_arg_s32(val)               { .type = SIDE_TYPE_S32, .u = { .side_s32 = (val) } }
 367 #define side_arg_s64(val)               { .type = SIDE_TYPE_S64, .u = { .side_s64 = (val) } }
 368 #define side_arg_string(val)            { .type = SIDE_TYPE_STRING, .u = { .string = (val) } }
 369 #define side_arg_struct(_side_type)     { .type = SIDE_TYPE_STRUCT, .u = { .side_struct = (_side_type) } }
 370 #define side_arg_array(_side_type)      { .type = SIDE_TYPE_ARRAY, .u = { .side_array = (_side_type) } }
 371 #define side_arg_vla(_side_type)        { .type = SIDE_TYPE_VLA, .u = { .side_vla = (_side_type) } }
 372 #define side_arg_vla_visitor(_ctx)      { .type = SIDE_TYPE_VLA_VISITOR, .u = { .side_vla_app_visitor_ctx = (_ctx) } }
 373
 374 #define side_arg_array_u8(_ptr)         { .type = SIDE_TYPE_ARRAY_U8, .u = { .side_array_fixint = (_ptr) } }
 375 #define side_arg_array_u16(_ptr)        { .type = SIDE_TYPE_ARRAY_U16, .u = { .side_array_fixint = (_ptr) } }
 376 #define side_arg_array_u32(_ptr)        { .type = SIDE_TYPE_ARRAY_U32, .u = { .side_array_fixint = (_ptr) } }
 377 #define side_arg_array_u64(_ptr)        { .type = SIDE_TYPE_ARRAY_U64, .u = { .side_array_fixint = (_ptr) } }
 378 #define side_arg_array_s8(_ptr)         { .type = SIDE_TYPE_ARRAY_S8, .u = { .side_array_fixint = (_ptr) } }
 379 #define side_arg_array_s16(_ptr)        { .type = SIDE_TYPE_ARRAY_S16, .u = { .side_array_fixint  = (_ptr) } }
 380 #define side_arg_array_s32(_ptr)        { .type = SIDE_TYPE_ARRAY_S32, .u = { .side_array_fixint = (_ptr) } }
 381 #define side_arg_array_s64(_ptr)        { .type = SIDE_TYPE_ARRAY_S64, .u = { .side_array_fixint = (_ptr) } }
 382
 383 #define side_arg_vla_u8(_ptr, _length)  { .type = SIDE_TYPE_VLA_U8, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } }
 384 #define side_arg_vla_u16(_ptr, _length) { .type = SIDE_TYPE_VLA_U16, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 385 #define side_arg_vla_u32(_ptr, _length) { .type = SIDE_TYPE_VLA_U32, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 386 #define side_arg_vla_u64(_ptr, _length) { .type = SIDE_TYPE_VLA_U64, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 387 #define side_arg_vla_s8(_ptr, _length)  { .type = SIDE_TYPE_VLA_S8, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 388 #define side_arg_vla_s16(_ptr, _length) { .type = SIDE_TYPE_VLA_S16, .u = { .side_vla_fixint  = { .p = (_ptr), .length = (_length) } } }
 389 #define side_arg_vla_s32(_ptr, _length) { .type = SIDE_TYPE_VLA_S32, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 390 #define side_arg_vla_s64(_ptr, _length) { .type = SIDE_TYPE_VLA_S64, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 391
 392 #define side_arg_dynamic(dynamic_arg_type) \
 393         { \
 394                 .type = SIDE_TYPE_DYNAMIC, \
 395                 .u = { \
 396                         .dynamic = dynamic_arg_type, \
 397                 }, \
 398         }
 399
 400 #define side_arg_dynamic_null(val)      { .dynamic_type = SIDE_DYNAMIC_TYPE_NULL }
 401
 402 #define side_arg_dynamic_bool(val)      { .dynamic_type = SIDE_DYNAMIC_TYPE_BOOL, .u = { .side_bool = !!(val) } }
 403 #define side_arg_dynamic_u8(val)        { .dynamic_type = SIDE_DYNAMIC_TYPE_U8, .u = { .side_u8 = (val) } }
 404 #define side_arg_dynamic_u16(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_U16, .u = { .side_u16 = (val) } }
 405 #define side_arg_dynamic_u32(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_U32, .u = { .side_u32 = (val) } }
 406 #define side_arg_dynamic_u64(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_U64, .u = { .side_u64 = (val) } }
 407 #define side_arg_dynamic_s8(val)        { .dynamic_type = SIDE_DYNAMIC_TYPE_S8, .u = { .side_s8 = (val) } }
 408 #define side_arg_dynamic_s16(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_S16, .u = { .side_s16 = (val) } }
 409 #define side_arg_dynamic_s32(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_S32, .u = { .side_s32 = (val) } }
 410 #define side_arg_dynamic_s64(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_S64, .u = { .side_s64 = (val) } }
 411 #define side_arg_dynamic_string(val)    { .dynamic_type = SIDE_DYNAMIC_TYPE_STRING, .u = { .string = (val) } }
 412
 413 #define side_arg_dynamic_vla(_vla)      { .dynamic_type = SIDE_DYNAMIC_TYPE_VLA, .u = { .side_dynamic_vla = (_vla) } }
 414 #define side_arg_dynamic_vla_visitor(_dynamic_vla_visitor, _ctx) \
 415         { \
 416                 .dynamic_type = SIDE_DYNAMIC_TYPE_VLA_VISITOR, \
 417                 .u = { \
 418                         .side_dynamic_vla_visitor = { \
 419                                 .app_ctx = _ctx, \
 420                                 .visitor = _dynamic_vla_visitor, \
 421                         }, \
 422                 }, \
 423         }
 424
 425 #define side_arg_dynamic_struct(_struct)        { .dynamic_type = SIDE_DYNAMIC_TYPE_STRUCT, .u = { .side_dynamic_struct = (_struct) } }
 426 #define side_arg_dynamic_struct_visitor(_dynamic_struct_visitor, _ctx) \
 427         { \
 428                 .dynamic_type = SIDE_DYNAMIC_TYPE_STRUCT_VISITOR, \
 429                 .u = { \
 430                         .side_dynamic_struct_visitor = { \
 431                                 .app_ctx = _ctx, \
 432                                 .visitor = _dynamic_struct_visitor, \
 433                         }, \
 434                 }, \
 435         }
 436
 437 #define side_arg_dynamic_define_vec(_identifier, _sav) \
 438         const struct side_arg_dynamic_vec _identifier##_vec[] = { _sav }; \
 439         const struct side_arg_dynamic_vec_vla _identifier = { \
 440                 .sav = _identifier##_vec, \
 441                 .len = SIDE_ARRAY_SIZE(_identifier##_vec), \
 442         }
 443
 444 #define side_arg_dynamic_define_struct(_identifier, _struct_fields) \
 445         const struct side_arg_dynamic_event_field _identifier##_fields[] = { _struct_fields }; \
 446         const struct side_arg_dynamic_event_struct _identifier = { \
 447                 .fields = _identifier##_fields, \
 448                 .len = SIDE_ARRAY_SIZE(_identifier##_fields), \
 449         }
 450
 451 #define side_arg_define_vec(_identifier, _sav) \
 452         const struct side_arg_vec _identifier##_vec[] = { _sav }; \
 453         const struct side_arg_vec_description _identifier = { \
 454                 .sav = _identifier##_vec, \
 455                 .len = SIDE_ARRAY_SIZE(_identifier##_vec), \
 456         }
 457
 458 #define side_arg_dynamic_field(_name, _elem) \
 459         { \
 460                 .field_name = _name, \
 461                 .elem = _elem, \
 462         }
 463
 464 #define side_arg_list(...)      __VA_ARGS__
 465
 466 #define side_event_cond(desc) if (side_unlikely((desc)->enabled))
 467
 468 #define side_event_call(desc, _sav) \
 469         { \
 470                 const struct side_arg_vec side_sav[] = { _sav }; \
 471                 const struct side_arg_vec_description sav_desc = { \
 472                         .sav = side_sav, \
 473                         .len = SIDE_ARRAY_SIZE(side_sav), \
 474                 }; \
 475                 tracer_call(desc, &sav_desc); \
 476         }
 477
 478 #define side_event(desc, sav) \
 479         side_event_cond(desc) \
 480                 side_event_call(desc, SIDE_PARAM(sav))
 481
 482 #define side_event_call_variadic(desc, _sav, _var_fields) \
 483         { \
 484                 const struct side_arg_vec side_sav[] = { _sav }; \
 485                 const struct side_arg_vec_description sav_desc = { \
 486                         .sav = side_sav, \
 487                         .len = SIDE_ARRAY_SIZE(side_sav), \
 488                 }; \
 489                 const struct side_arg_dynamic_event_field side_fields[] = { _var_fields }; \
 490                 const struct side_arg_dynamic_event_struct var_struct = { \
 491                         .fields = side_fields, \
 492                         .len = SIDE_ARRAY_SIZE(side_fields), \
 493                 }; \
 494                 tracer_call_variadic(desc, &sav_desc, &var_struct); \
 495         }
 496
 497 #define side_event_variadic(desc, sav, var) \
 498         side_event_cond(desc) \
 499                 side_event_call_variadic(desc, SIDE_PARAM(sav), SIDE_PARAM(var))
 500
 501 #define _side_define_event(_identifier, _provider, _event, _loglevel, _attr, _fields, _flags) \
 502         struct side_event_description _identifier = { \
 503                 .version = 0, \
 504                 .enabled = 0, \
 505                 .loglevel = _loglevel, \
 506                 .nr_fields = SIDE_ARRAY_SIZE(SIDE_PARAM(_fields)), \
 507                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 508                 .flags = (_flags), \
 509                 .provider_name = _provider, \
 510                 .event_name = _event, \
 511                 .fields = _fields, \
 512                 .attr = _attr, \
 513         }
 514
 515 #define side_define_event(_identifier, _provider, _event, _loglevel, _attr, _fields) \
 516         _side_define_event(_identifier, _provider, _event, _loglevel, SIDE_PARAM(_attr), \
 517                         SIDE_PARAM(_fields), 0)
 518
 519 #define side_define_event_variadic(_identifier, _provider, _event, _loglevel, _attr, _fields) \
 520         _side_define_event(_identifier, _provider, _event, _loglevel, SIDE_PARAM(_attr), \
 521                         SIDE_PARAM(_fields), SIDE_EVENT_FLAG_VARIADIC)
 522
 523 #define side_declare_event(_identifier) \
 524         struct side_event_description _identifier
 525
 526 #endif /* _SIDE_TRACE_H */