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         uint32_t nr_attr;
 125         const struct side_attr *attr;
 126         union {
 127                 struct {
 128                         uint32_t nr_fields;
 129                         const struct side_event_field *fields;
 130                 } side_struct;
 131                 struct {
 132                         uint32_t length;
 133                         const struct side_type_description *elem_type;
 134                 } side_array;
 135                 struct {
 136                         const struct side_type_description *elem_type;
 137                 } side_vla;
 138                 struct {
 139                         const struct side_type_description *elem_type;
 140                         side_visitor visitor;
 141                 } side_vla_visitor;
 142         } u;
 143 };
 144
 145 struct side_event_field {
 146         const char *field_name;
 147         struct side_type_description side_type;
 148 };
 149
 150 enum side_event_flags {
 151         SIDE_EVENT_FLAG_VARIADIC = (1 << 0),
 152 };
 153
 154 struct side_event_description {
 155         uint32_t version;
 156         uint32_t enabled;
 157         uint32_t loglevel;      /* enum side_loglevel */
 158         uint32_t nr_fields;
 159         uint32_t nr_attr;
 160         uint32_t _unused;
 161         uint64_t flags;
 162         const char *provider_name;
 163         const char *event_name;
 164         const struct side_event_field *fields;
 165         const struct side_attr *attr;
 166 };
 167
 168 struct side_arg_dynamic_vec_vla {
 169         const struct side_arg_dynamic_vec *sav;
 170         uint32_t len;
 171 };
 172
 173 struct side_arg_dynamic_vec {
 174         uint32_t dynamic_type;  /* enum side_dynamic_type */
 175         union {
 176                 uint8_t side_bool;
 177
 178                 uint8_t side_u8;
 179                 uint16_t side_u16;
 180                 uint32_t side_u32;
 181                 uint64_t side_u64;
 182                 int8_t side_s8;
 183                 int16_t side_s16;
 184                 int32_t side_s32;
 185                 int64_t side_s64;
 186
 187                 const char *string;
 188
 189                 const struct side_arg_dynamic_event_struct *side_dynamic_struct;
 190                 struct {
 191                         void *app_ctx;
 192                         side_dynamic_struct_visitor visitor;
 193                 } side_dynamic_struct_visitor;
 194
 195                 const struct side_arg_dynamic_vec_vla *side_dynamic_vla;
 196                 struct {
 197                         void *app_ctx;
 198                         side_dynamic_vla_visitor visitor;
 199                 } side_dynamic_vla_visitor;
 200         } u;
 201 };
 202
 203 struct side_arg_dynamic_event_field {
 204         const char *field_name;
 205         const struct side_arg_dynamic_vec elem;
 206         //TODO: we should add something like a list of user attributes (namespaced strings)
 207 };
 208
 209 struct side_arg_dynamic_event_struct {
 210         const struct side_arg_dynamic_event_field *fields;
 211         uint32_t len;
 212 };
 213
 214 struct side_arg_vec {
 215         enum side_type type;
 216         union {
 217                 uint8_t side_bool;
 218
 219                 uint8_t side_u8;
 220                 uint16_t side_u16;
 221                 uint32_t side_u32;
 222                 uint64_t side_u64;
 223                 int8_t side_s8;
 224                 int16_t side_s16;
 225                 int32_t side_s32;
 226                 int64_t side_s64;
 227
 228                 const char *string;
 229                 const struct side_arg_vec_description *side_struct;
 230                 const struct side_arg_vec_description *side_array;
 231                 const struct side_arg_vec_description *side_vla;
 232                 void *side_vla_app_visitor_ctx;
 233
 234                 void *side_array_fixint;
 235                 struct {
 236                         void *p;
 237                         uint32_t length;
 238                 } side_vla_fixint;
 239
 240                 struct side_arg_dynamic_vec dynamic;
 241         } u;
 242 };
 243
 244 struct side_arg_vec_description {
 245         const struct side_arg_vec *sav;
 246         uint32_t len;
 247 };
 248
 249 /* The visitor pattern is a double-dispatch visitor. */
 250 struct side_tracer_visitor_ctx {
 251         enum side_visitor_status (*write_elem)(
 252                         const struct side_tracer_visitor_ctx *tracer_ctx,
 253                         const struct side_arg_vec *elem);
 254         void *priv;             /* Private tracer context. */
 255 };
 256
 257 struct side_tracer_dynamic_struct_visitor_ctx {
 258         enum side_visitor_status (*write_field)(
 259                         const struct side_tracer_dynamic_struct_visitor_ctx *tracer_ctx,
 260                         const struct side_arg_dynamic_event_field *dynamic_field);
 261         void *priv;             /* Private tracer context. */
 262 };
 263
 264 struct side_tracer_dynamic_vla_visitor_ctx {
 265         enum side_visitor_status (*write_elem)(
 266                         const struct side_tracer_dynamic_vla_visitor_ctx *tracer_ctx,
 267                         const struct side_arg_dynamic_vec *elem);
 268         void *priv;             /* Private tracer context. */
 269 };
 270
 271 #define side_attr(_key, _value) \
 272         { \
 273                 .key = _key, \
 274                 .value = _value, \
 275         }
 276
 277 #define side_attr_list(...) \
 278         SIDE_COMPOUND_LITERAL(const struct side_attr, __VA_ARGS__)
 279
 280 #define side_type_decl(_type, _attr) \
 281         { \
 282                 .type = _type, \
 283                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 284                 .attr = _attr, \
 285         }
 286
 287 #define side_field(_name, _type, _attr) \
 288         { \
 289                 .field_name = _name, \
 290                 .side_type = side_type_decl(_type, SIDE_PARAM(_attr)), \
 291         }
 292
 293 #define side_type_struct_decl(_fields, _attr) \
 294         { \
 295                 .type = SIDE_TYPE_STRUCT, \
 296                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 297                 .attr = _attr, \
 298                 .u = { \
 299                         .side_struct = { \
 300                                 .nr_fields = SIDE_ARRAY_SIZE(SIDE_PARAM(_fields)), \
 301                                 .fields = _fields, \
 302                         }, \
 303                 }, \
 304         }
 305 #define side_field_struct(_name, _fields, _attr) \
 306         { \
 307                 .field_name = _name, \
 308                 .side_type = side_type_struct_decl(SIDE_PARAM(_fields), SIDE_PARAM(_attr)), \
 309         }
 310
 311 #define side_type_array_decl(_elem_type, _length, _attr) \
 312         { \
 313                 .type = SIDE_TYPE_ARRAY, \
 314                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 315                 .attr = _attr, \
 316                 .u = { \
 317                         .side_array = { \
 318                                 .length = _length, \
 319                                 .elem_type = _elem_type, \
 320                         }, \
 321                 }, \
 322         }
 323 #define side_field_array(_name, _elem_type, _length, _attr) \
 324         { \
 325                 .field_name = _name, \
 326                 .side_type = side_type_array_decl(SIDE_PARAM(_elem_type), _length, SIDE_PARAM(_attr)), \
 327         }
 328
 329 #define side_type_vla_decl(_elem_type, _attr) \
 330         { \
 331                 .type = SIDE_TYPE_VLA, \
 332                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 333                 .attr = _attr, \
 334                 .u = { \
 335                         .side_vla = { \
 336                                 .elem_type = _elem_type, \
 337                         }, \
 338                 }, \
 339         }
 340 #define side_field_vla(_name, _elem_type, _attr) \
 341         { \
 342                 .field_name = _name, \
 343                 .side_type = side_type_vla_decl(SIDE_PARAM(_elem_type), SIDE_PARAM(_attr)), \
 344         }
 345
 346 #define side_type_vla_visitor_decl(_elem_type, _visitor, _attr) \
 347         { \
 348                 .type = SIDE_TYPE_VLA_VISITOR, \
 349                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 350                 .attr = _attr, \
 351                 .u = { \
 352                         .side_vla_visitor = { \
 353                                 .elem_type = SIDE_PARAM(_elem_type), \
 354                                 .visitor = _visitor, \
 355                         }, \
 356                 }, \
 357         }
 358 #define side_field_vla_visitor(_name, _elem_type, _visitor, _attr) \
 359         { \
 360                 .field_name = _name, \
 361                 .side_type = side_type_vla_visitor_decl(SIDE_PARAM(_elem_type), _visitor, SIDE_PARAM(_attr)), \
 362         }
 363
 364 #define side_elem(...) \
 365         SIDE_COMPOUND_LITERAL(const struct side_type_description, __VA_ARGS__)
 366
 367 #define side_elem_type(_type, _attr) \
 368         side_elem(side_type_decl(_type, SIDE_PARAM(_attr)))
 369
 370 #define side_field_list(...) \
 371         SIDE_COMPOUND_LITERAL(const struct side_event_field, __VA_ARGS__)
 372
 373 #define side_arg_bool(val)              { .type = SIDE_TYPE_BOOL, .u = { .side_bool = !!(val) } }
 374 #define side_arg_u8(val)                { .type = SIDE_TYPE_U8, .u = { .side_u8 = (val) } }
 375 #define side_arg_u16(val)               { .type = SIDE_TYPE_U16, .u = { .side_u16 = (val) } }
 376 #define side_arg_u32(val)               { .type = SIDE_TYPE_U32, .u = { .side_u32 = (val) } }
 377 #define side_arg_u64(val)               { .type = SIDE_TYPE_U64, .u = { .side_u64 = (val) } }
 378 #define side_arg_s8(val)                { .type = SIDE_TYPE_S8, .u = { .side_s8 = (val) } }
 379 #define side_arg_s16(val)               { .type = SIDE_TYPE_S16, .u = { .side_s16 = (val) } }
 380 #define side_arg_s32(val)               { .type = SIDE_TYPE_S32, .u = { .side_s32 = (val) } }
 381 #define side_arg_s64(val)               { .type = SIDE_TYPE_S64, .u = { .side_s64 = (val) } }
 382 #define side_arg_string(val)            { .type = SIDE_TYPE_STRING, .u = { .string = (val) } }
 383 #define side_arg_struct(_side_type)     { .type = SIDE_TYPE_STRUCT, .u = { .side_struct = (_side_type) } }
 384 #define side_arg_array(_side_type)      { .type = SIDE_TYPE_ARRAY, .u = { .side_array = (_side_type) } }
 385 #define side_arg_vla(_side_type)        { .type = SIDE_TYPE_VLA, .u = { .side_vla = (_side_type) } }
 386 #define side_arg_vla_visitor(_ctx)      { .type = SIDE_TYPE_VLA_VISITOR, .u = { .side_vla_app_visitor_ctx = (_ctx) } }
 387
 388 #define side_arg_array_u8(_ptr)         { .type = SIDE_TYPE_ARRAY_U8, .u = { .side_array_fixint = (_ptr) } }
 389 #define side_arg_array_u16(_ptr)        { .type = SIDE_TYPE_ARRAY_U16, .u = { .side_array_fixint = (_ptr) } }
 390 #define side_arg_array_u32(_ptr)        { .type = SIDE_TYPE_ARRAY_U32, .u = { .side_array_fixint = (_ptr) } }
 391 #define side_arg_array_u64(_ptr)        { .type = SIDE_TYPE_ARRAY_U64, .u = { .side_array_fixint = (_ptr) } }
 392 #define side_arg_array_s8(_ptr)         { .type = SIDE_TYPE_ARRAY_S8, .u = { .side_array_fixint = (_ptr) } }
 393 #define side_arg_array_s16(_ptr)        { .type = SIDE_TYPE_ARRAY_S16, .u = { .side_array_fixint  = (_ptr) } }
 394 #define side_arg_array_s32(_ptr)        { .type = SIDE_TYPE_ARRAY_S32, .u = { .side_array_fixint = (_ptr) } }
 395 #define side_arg_array_s64(_ptr)        { .type = SIDE_TYPE_ARRAY_S64, .u = { .side_array_fixint = (_ptr) } }
 396
 397 #define side_arg_vla_u8(_ptr, _length)  { .type = SIDE_TYPE_VLA_U8, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } }
 398 #define side_arg_vla_u16(_ptr, _length) { .type = SIDE_TYPE_VLA_U16, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 399 #define side_arg_vla_u32(_ptr, _length) { .type = SIDE_TYPE_VLA_U32, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 400 #define side_arg_vla_u64(_ptr, _length) { .type = SIDE_TYPE_VLA_U64, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 401 #define side_arg_vla_s8(_ptr, _length)  { .type = SIDE_TYPE_VLA_S8, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 402 #define side_arg_vla_s16(_ptr, _length) { .type = SIDE_TYPE_VLA_S16, .u = { .side_vla_fixint  = { .p = (_ptr), .length = (_length) } } }
 403 #define side_arg_vla_s32(_ptr, _length) { .type = SIDE_TYPE_VLA_S32, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 404 #define side_arg_vla_s64(_ptr, _length) { .type = SIDE_TYPE_VLA_S64, .u = { .side_vla_fixint = { .p = (_ptr), .length = (_length) } } }
 405
 406 #define side_arg_dynamic(dynamic_arg_type) \
 407         { \
 408                 .type = SIDE_TYPE_DYNAMIC, \
 409                 .u = { \
 410                         .dynamic = dynamic_arg_type, \
 411                 }, \
 412         }
 413
 414 #define side_arg_dynamic_null(val)      { .dynamic_type = SIDE_DYNAMIC_TYPE_NULL }
 415
 416 #define side_arg_dynamic_bool(val)      { .dynamic_type = SIDE_DYNAMIC_TYPE_BOOL, .u = { .side_bool = !!(val) } }
 417 #define side_arg_dynamic_u8(val)        { .dynamic_type = SIDE_DYNAMIC_TYPE_U8, .u = { .side_u8 = (val) } }
 418 #define side_arg_dynamic_u16(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_U16, .u = { .side_u16 = (val) } }
 419 #define side_arg_dynamic_u32(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_U32, .u = { .side_u32 = (val) } }
 420 #define side_arg_dynamic_u64(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_U64, .u = { .side_u64 = (val) } }
 421 #define side_arg_dynamic_s8(val)        { .dynamic_type = SIDE_DYNAMIC_TYPE_S8, .u = { .side_s8 = (val) } }
 422 #define side_arg_dynamic_s16(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_S16, .u = { .side_s16 = (val) } }
 423 #define side_arg_dynamic_s32(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_S32, .u = { .side_s32 = (val) } }
 424 #define side_arg_dynamic_s64(val)       { .dynamic_type = SIDE_DYNAMIC_TYPE_S64, .u = { .side_s64 = (val) } }
 425 #define side_arg_dynamic_string(val)    { .dynamic_type = SIDE_DYNAMIC_TYPE_STRING, .u = { .string = (val) } }
 426
 427 #define side_arg_dynamic_vla(_vla)      { .dynamic_type = SIDE_DYNAMIC_TYPE_VLA, .u = { .side_dynamic_vla = (_vla) } }
 428 #define side_arg_dynamic_vla_visitor(_dynamic_vla_visitor, _ctx) \
 429         { \
 430                 .dynamic_type = SIDE_DYNAMIC_TYPE_VLA_VISITOR, \
 431                 .u = { \
 432                         .side_dynamic_vla_visitor = { \
 433                                 .app_ctx = _ctx, \
 434                                 .visitor = _dynamic_vla_visitor, \
 435                         }, \
 436                 }, \
 437         }
 438
 439 #define side_arg_dynamic_struct(_struct)        { .dynamic_type = SIDE_DYNAMIC_TYPE_STRUCT, .u = { .side_dynamic_struct = (_struct) } }
 440 #define side_arg_dynamic_struct_visitor(_dynamic_struct_visitor, _ctx) \
 441         { \
 442                 .dynamic_type = SIDE_DYNAMIC_TYPE_STRUCT_VISITOR, \
 443                 .u = { \
 444                         .side_dynamic_struct_visitor = { \
 445                                 .app_ctx = _ctx, \
 446                                 .visitor = _dynamic_struct_visitor, \
 447                         }, \
 448                 }, \
 449         }
 450
 451 #define side_arg_dynamic_define_vec(_identifier, _sav) \
 452         const struct side_arg_dynamic_vec _identifier##_vec[] = { _sav }; \
 453         const struct side_arg_dynamic_vec_vla _identifier = { \
 454                 .sav = _identifier##_vec, \
 455                 .len = SIDE_ARRAY_SIZE(_identifier##_vec), \
 456         }
 457
 458 #define side_arg_dynamic_define_struct(_identifier, _struct_fields) \
 459         const struct side_arg_dynamic_event_field _identifier##_fields[] = { _struct_fields }; \
 460         const struct side_arg_dynamic_event_struct _identifier = { \
 461                 .fields = _identifier##_fields, \
 462                 .len = SIDE_ARRAY_SIZE(_identifier##_fields), \
 463         }
 464
 465 #define side_arg_define_vec(_identifier, _sav) \
 466         const struct side_arg_vec _identifier##_vec[] = { _sav }; \
 467         const struct side_arg_vec_description _identifier = { \
 468                 .sav = _identifier##_vec, \
 469                 .len = SIDE_ARRAY_SIZE(_identifier##_vec), \
 470         }
 471
 472 #define side_arg_dynamic_field(_name, _elem) \
 473         { \
 474                 .field_name = _name, \
 475                 .elem = _elem, \
 476         }
 477
 478 #define side_arg_list(...)      __VA_ARGS__
 479
 480 #define side_event_cond(desc) if (side_unlikely((desc)->enabled))
 481
 482 #define side_event_call(desc, _sav) \
 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                 tracer_call(desc, &sav_desc); \
 490         }
 491
 492 #define side_event(desc, sav) \
 493         side_event_cond(desc) \
 494                 side_event_call(desc, SIDE_PARAM(sav))
 495
 496 #define side_event_call_variadic(desc, _sav, _var_fields) \
 497         { \
 498                 const struct side_arg_vec side_sav[] = { _sav }; \
 499                 const struct side_arg_vec_description sav_desc = { \
 500                         .sav = side_sav, \
 501                         .len = SIDE_ARRAY_SIZE(side_sav), \
 502                 }; \
 503                 const struct side_arg_dynamic_event_field side_fields[] = { _var_fields }; \
 504                 const struct side_arg_dynamic_event_struct var_struct = { \
 505                         .fields = side_fields, \
 506                         .len = SIDE_ARRAY_SIZE(side_fields), \
 507                 }; \
 508                 tracer_call_variadic(desc, &sav_desc, &var_struct); \
 509         }
 510
 511 #define side_event_variadic(desc, sav, var) \
 512         side_event_cond(desc) \
 513                 side_event_call_variadic(desc, SIDE_PARAM(sav), SIDE_PARAM(var))
 514
 515 #define _side_define_event(_identifier, _provider, _event, _loglevel, _attr, _fields, _flags) \
 516         struct side_event_description _identifier = { \
 517                 .version = 0, \
 518                 .enabled = 0, \
 519                 .loglevel = _loglevel, \
 520                 .nr_fields = SIDE_ARRAY_SIZE(SIDE_PARAM(_fields)), \
 521                 .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
 522                 .flags = (_flags), \
 523                 .provider_name = _provider, \
 524                 .event_name = _event, \
 525                 .fields = _fields, \
 526                 .attr = _attr, \
 527         }
 528
 529 #define side_define_event(_identifier, _provider, _event, _loglevel, _attr, _fields) \
 530         _side_define_event(_identifier, _provider, _event, _loglevel, SIDE_PARAM(_attr), \
 531                         SIDE_PARAM(_fields), 0)
 532
 533 #define side_define_event_variadic(_identifier, _provider, _event, _loglevel, _attr, _fields) \
 534         _side_define_event(_identifier, _provider, _event, _loglevel, SIDE_PARAM(_attr), \
 535                         SIDE_PARAM(_fields), SIDE_EVENT_FLAG_VARIADIC)
 536
 537 #define side_declare_event(_identifier) \
 538         struct side_event_description _identifier
 539
 540 #endif /* _SIDE_TRACE_H */