| 1 | /* |
| 2 | * event-expr.c |
| 3 | * |
| 4 | * Linux Trace Toolkit Control Library |
| 5 | * |
| 6 | * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com> |
| 7 | * |
| 8 | * SPDX-License-Identifier: LGPL-2.1-only |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #define _LGPL_SOURCE |
| 13 | #include <assert.h> |
| 14 | #include <stddef.h> |
| 15 | |
| 16 | #include <common/error.h> |
| 17 | #include <common/macros.h> |
| 18 | #include <lttng/event-expr-internal.h> |
| 19 | |
| 20 | enum lttng_event_expr_type lttng_event_expr_get_type( |
| 21 | const struct lttng_event_expr *expr) |
| 22 | { |
| 23 | enum lttng_event_expr_type type; |
| 24 | |
| 25 | if (!expr) { |
| 26 | type = LTTNG_EVENT_EXPR_TYPE_INVALID; |
| 27 | goto end; |
| 28 | } |
| 29 | |
| 30 | type = expr->type; |
| 31 | |
| 32 | end: |
| 33 | return type; |
| 34 | } |
| 35 | |
| 36 | static |
| 37 | struct lttng_event_expr *create_empty_expr(enum lttng_event_expr_type type, |
| 38 | size_t size) |
| 39 | { |
| 40 | struct lttng_event_expr *expr; |
| 41 | |
| 42 | expr = zmalloc(size); |
| 43 | if (!expr) { |
| 44 | goto end; |
| 45 | } |
| 46 | |
| 47 | expr->type = type; |
| 48 | |
| 49 | end: |
| 50 | return expr; |
| 51 | } |
| 52 | |
| 53 | static |
| 54 | struct lttng_event_expr_field *create_field_event_expr( |
| 55 | enum lttng_event_expr_type type, |
| 56 | const char *name) |
| 57 | { |
| 58 | struct lttng_event_expr_field *expr = |
| 59 | container_of( |
| 60 | create_empty_expr(type, sizeof(*expr)), |
| 61 | struct lttng_event_expr_field, parent); |
| 62 | |
| 63 | if (!expr) { |
| 64 | goto error; |
| 65 | } |
| 66 | |
| 67 | assert(name); |
| 68 | expr->name = strdup(name); |
| 69 | if (!expr->name) { |
| 70 | goto error; |
| 71 | } |
| 72 | |
| 73 | goto end; |
| 74 | |
| 75 | error: |
| 76 | lttng_event_expr_destroy(&expr->parent); |
| 77 | |
| 78 | end: |
| 79 | return expr; |
| 80 | } |
| 81 | |
| 82 | struct lttng_event_expr *lttng_event_expr_event_payload_field_create( |
| 83 | const char *field_name) |
| 84 | { |
| 85 | struct lttng_event_expr *expr = NULL; |
| 86 | |
| 87 | if (!field_name) { |
| 88 | goto end; |
| 89 | } |
| 90 | |
| 91 | expr = &create_field_event_expr( |
| 92 | LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD, |
| 93 | field_name)->parent; |
| 94 | |
| 95 | end: |
| 96 | return expr; |
| 97 | } |
| 98 | |
| 99 | struct lttng_event_expr *lttng_event_expr_channel_context_field_create( |
| 100 | const char *field_name) |
| 101 | { |
| 102 | struct lttng_event_expr *expr = NULL; |
| 103 | |
| 104 | if (!field_name) { |
| 105 | goto end; |
| 106 | } |
| 107 | |
| 108 | expr = &create_field_event_expr( |
| 109 | LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD, |
| 110 | field_name)->parent; |
| 111 | |
| 112 | end: |
| 113 | return expr; |
| 114 | } |
| 115 | |
| 116 | struct lttng_event_expr *lttng_event_expr_app_specific_context_field_create( |
| 117 | const char *provider_name, const char *type_name) |
| 118 | { |
| 119 | struct lttng_event_expr_app_specific_context_field *expr = NULL; |
| 120 | |
| 121 | if (!type_name || !provider_name) { |
| 122 | goto error; |
| 123 | } |
| 124 | |
| 125 | expr = container_of(create_empty_expr( |
| 126 | LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD, |
| 127 | sizeof(*expr)), |
| 128 | struct lttng_event_expr_app_specific_context_field, |
| 129 | parent); |
| 130 | if (!expr) { |
| 131 | goto error; |
| 132 | } |
| 133 | |
| 134 | expr->provider_name = strdup(provider_name); |
| 135 | if (!expr->provider_name) { |
| 136 | goto error; |
| 137 | } |
| 138 | |
| 139 | expr->type_name = strdup(type_name); |
| 140 | if (!expr->type_name) { |
| 141 | goto error; |
| 142 | } |
| 143 | |
| 144 | goto end; |
| 145 | |
| 146 | error: |
| 147 | lttng_event_expr_destroy(&expr->parent); |
| 148 | |
| 149 | end: |
| 150 | return &expr->parent; |
| 151 | } |
| 152 | |
| 153 | struct lttng_event_expr *lttng_event_expr_array_field_element_create( |
| 154 | struct lttng_event_expr *array_field_expr, |
| 155 | unsigned int index) |
| 156 | { |
| 157 | struct lttng_event_expr_array_field_element *expr = NULL; |
| 158 | |
| 159 | /* The parent array field expression must be an l-value */ |
| 160 | if (!array_field_expr || |
| 161 | !lttng_event_expr_is_lvalue(array_field_expr)) { |
| 162 | goto error; |
| 163 | } |
| 164 | |
| 165 | expr = container_of(create_empty_expr( |
| 166 | LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT, |
| 167 | sizeof(*expr)), |
| 168 | struct lttng_event_expr_array_field_element, |
| 169 | parent); |
| 170 | if (!expr) { |
| 171 | goto error; |
| 172 | } |
| 173 | |
| 174 | expr->array_field_expr = array_field_expr; |
| 175 | expr->index = index; |
| 176 | goto end; |
| 177 | |
| 178 | error: |
| 179 | lttng_event_expr_destroy(&expr->parent); |
| 180 | |
| 181 | end: |
| 182 | return &expr->parent; |
| 183 | } |
| 184 | |
| 185 | const char *lttng_event_expr_event_payload_field_get_name( |
| 186 | const struct lttng_event_expr *expr) |
| 187 | { |
| 188 | const char *ret = NULL; |
| 189 | |
| 190 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD) { |
| 191 | goto end; |
| 192 | } |
| 193 | |
| 194 | ret = container_of(expr, |
| 195 | const struct lttng_event_expr_field, parent)->name; |
| 196 | |
| 197 | end: |
| 198 | return ret; |
| 199 | } |
| 200 | |
| 201 | const char *lttng_event_expr_channel_context_field_get_name( |
| 202 | const struct lttng_event_expr *expr) |
| 203 | { |
| 204 | const char *ret = NULL; |
| 205 | |
| 206 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD) { |
| 207 | goto end; |
| 208 | } |
| 209 | |
| 210 | ret = container_of(expr, |
| 211 | const struct lttng_event_expr_field, parent)->name; |
| 212 | |
| 213 | end: |
| 214 | return ret; |
| 215 | } |
| 216 | |
| 217 | const char *lttng_event_expr_app_specific_context_field_get_provider_name( |
| 218 | const struct lttng_event_expr *expr) |
| 219 | { |
| 220 | const char *ret = NULL; |
| 221 | |
| 222 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { |
| 223 | goto end; |
| 224 | } |
| 225 | |
| 226 | ret = container_of(expr, |
| 227 | const struct lttng_event_expr_app_specific_context_field, |
| 228 | parent)->provider_name; |
| 229 | |
| 230 | end: |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | const char *lttng_event_expr_app_specific_context_field_get_type_name( |
| 235 | const struct lttng_event_expr *expr) |
| 236 | { |
| 237 | const char *ret = NULL; |
| 238 | |
| 239 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { |
| 240 | goto end; |
| 241 | } |
| 242 | |
| 243 | ret = container_of(expr, |
| 244 | const struct lttng_event_expr_app_specific_context_field, |
| 245 | parent)->type_name; |
| 246 | |
| 247 | end: |
| 248 | return ret; |
| 249 | } |
| 250 | |
| 251 | const struct lttng_event_expr * |
| 252 | lttng_event_expr_array_field_element_get_parent_expr( |
| 253 | const struct lttng_event_expr *expr) |
| 254 | { |
| 255 | const struct lttng_event_expr *ret = NULL; |
| 256 | |
| 257 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT) { |
| 258 | goto end; |
| 259 | } |
| 260 | |
| 261 | ret = container_of(expr, |
| 262 | const struct lttng_event_expr_array_field_element, |
| 263 | parent)->array_field_expr; |
| 264 | |
| 265 | end: |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | enum lttng_event_expr_status lttng_event_expr_array_field_element_get_index( |
| 270 | const struct lttng_event_expr *expr, unsigned int *index) |
| 271 | { |
| 272 | enum lttng_event_expr_status ret = LTTNG_EVENT_EXPR_STATUS_OK; |
| 273 | |
| 274 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT || |
| 275 | !index) { |
| 276 | ret = LTTNG_EVENT_EXPR_STATUS_INVALID; |
| 277 | goto end; |
| 278 | } |
| 279 | |
| 280 | *index = container_of(expr, |
| 281 | const struct lttng_event_expr_array_field_element, |
| 282 | parent)->index; |
| 283 | |
| 284 | end: |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | bool lttng_event_expr_is_equal(const struct lttng_event_expr *expr_a, |
| 289 | const struct lttng_event_expr *expr_b) |
| 290 | { |
| 291 | bool is_equal = true; |
| 292 | |
| 293 | if (!expr_a && !expr_b) { |
| 294 | /* Both `NULL`: equal */ |
| 295 | goto end; |
| 296 | } |
| 297 | |
| 298 | if (!expr_a || !expr_b) { |
| 299 | /* Only one `NULL`: not equal */ |
| 300 | goto not_equal; |
| 301 | } |
| 302 | |
| 303 | if (expr_a->type != expr_b->type) { |
| 304 | /* Different types: not equal */ |
| 305 | goto not_equal; |
| 306 | } |
| 307 | |
| 308 | switch (expr_a->type) { |
| 309 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: |
| 310 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: |
| 311 | { |
| 312 | const struct lttng_event_expr_field *field_expr_a = |
| 313 | container_of(expr_a, |
| 314 | const struct lttng_event_expr_field, |
| 315 | parent); |
| 316 | const struct lttng_event_expr_field *field_expr_b = |
| 317 | container_of(expr_b, |
| 318 | const struct lttng_event_expr_field, |
| 319 | parent); |
| 320 | |
| 321 | if (strcmp(field_expr_a->name, field_expr_b->name) != 0) { |
| 322 | goto not_equal; |
| 323 | } |
| 324 | |
| 325 | break; |
| 326 | } |
| 327 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: |
| 328 | { |
| 329 | const struct lttng_event_expr_app_specific_context_field *field_expr_a = |
| 330 | container_of(expr_a, |
| 331 | const struct lttng_event_expr_app_specific_context_field, |
| 332 | parent); |
| 333 | const struct lttng_event_expr_app_specific_context_field *field_expr_b = |
| 334 | container_of(expr_b, |
| 335 | const struct lttng_event_expr_app_specific_context_field, |
| 336 | parent); |
| 337 | |
| 338 | if (strcmp(field_expr_a->provider_name, |
| 339 | field_expr_b->provider_name) != 0) { |
| 340 | goto not_equal; |
| 341 | } |
| 342 | |
| 343 | if (strcmp(field_expr_a->type_name, |
| 344 | field_expr_b->type_name) != 0) { |
| 345 | goto not_equal; |
| 346 | } |
| 347 | |
| 348 | break; |
| 349 | } |
| 350 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: |
| 351 | { |
| 352 | const struct lttng_event_expr_array_field_element *elem_expr_a = |
| 353 | container_of(expr_a, |
| 354 | const struct lttng_event_expr_array_field_element, |
| 355 | parent); |
| 356 | const struct lttng_event_expr_array_field_element *elem_expr_b = |
| 357 | container_of(expr_b, |
| 358 | const struct lttng_event_expr_array_field_element, |
| 359 | parent); |
| 360 | |
| 361 | if (!lttng_event_expr_is_equal(elem_expr_a->array_field_expr, |
| 362 | elem_expr_b->array_field_expr)) { |
| 363 | goto not_equal; |
| 364 | } |
| 365 | |
| 366 | if (elem_expr_a->index != elem_expr_b->index) { |
| 367 | goto not_equal; |
| 368 | } |
| 369 | |
| 370 | break; |
| 371 | } |
| 372 | default: |
| 373 | break; |
| 374 | } |
| 375 | |
| 376 | goto end; |
| 377 | |
| 378 | not_equal: |
| 379 | is_equal = false; |
| 380 | |
| 381 | end: |
| 382 | return is_equal; |
| 383 | } |
| 384 | |
| 385 | void lttng_event_expr_destroy(struct lttng_event_expr *expr) |
| 386 | { |
| 387 | if (!expr) { |
| 388 | goto end; |
| 389 | } |
| 390 | |
| 391 | switch (expr->type) { |
| 392 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: |
| 393 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: |
| 394 | { |
| 395 | struct lttng_event_expr_field *field_expr = |
| 396 | container_of(expr, |
| 397 | struct lttng_event_expr_field, parent); |
| 398 | |
| 399 | free(field_expr->name); |
| 400 | break; |
| 401 | } |
| 402 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: |
| 403 | { |
| 404 | struct lttng_event_expr_app_specific_context_field *field_expr = |
| 405 | container_of(expr, |
| 406 | struct lttng_event_expr_app_specific_context_field, |
| 407 | parent); |
| 408 | |
| 409 | free(field_expr->provider_name); |
| 410 | free(field_expr->type_name); |
| 411 | break; |
| 412 | } |
| 413 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: |
| 414 | { |
| 415 | struct lttng_event_expr_array_field_element *elem_expr = |
| 416 | container_of(expr, |
| 417 | struct lttng_event_expr_array_field_element, |
| 418 | parent); |
| 419 | |
| 420 | lttng_event_expr_destroy(elem_expr->array_field_expr); |
| 421 | break; |
| 422 | } |
| 423 | default: |
| 424 | break; |
| 425 | } |
| 426 | |
| 427 | free(expr); |
| 428 | |
| 429 | end: |
| 430 | return; |
| 431 | } |