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48c47564 PP |
1 | /* |
2 | * event-expr.c | |
3 | * | |
48c47564 PP |
4 | * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com> |
5 | * | |
6 | * SPDX-License-Identifier: LGPL-2.1-only | |
7 | * | |
8 | */ | |
9 | ||
10 | #define _LGPL_SOURCE | |
11 | #include <assert.h> | |
12 | #include <stddef.h> | |
13 | ||
14 | #include <common/error.h> | |
15 | #include <common/macros.h> | |
16 | #include <lttng/event-expr-internal.h> | |
17 | ||
18 | enum lttng_event_expr_type lttng_event_expr_get_type( | |
19 | const struct lttng_event_expr *expr) | |
20 | { | |
21 | enum lttng_event_expr_type type; | |
22 | ||
23 | if (!expr) { | |
24 | type = LTTNG_EVENT_EXPR_TYPE_INVALID; | |
25 | goto end; | |
26 | } | |
27 | ||
28 | type = expr->type; | |
29 | ||
30 | end: | |
31 | return type; | |
32 | } | |
33 | ||
34 | static | |
35 | struct lttng_event_expr *create_empty_expr(enum lttng_event_expr_type type, | |
36 | size_t size) | |
37 | { | |
38 | struct lttng_event_expr *expr; | |
39 | ||
40 | expr = zmalloc(size); | |
41 | if (!expr) { | |
42 | goto end; | |
43 | } | |
44 | ||
45 | expr->type = type; | |
46 | ||
47 | end: | |
48 | return expr; | |
49 | } | |
50 | ||
51 | static | |
52 | struct lttng_event_expr_field *create_field_event_expr( | |
53 | enum lttng_event_expr_type type, | |
54 | const char *name) | |
55 | { | |
56 | struct lttng_event_expr_field *expr = | |
57 | container_of( | |
58 | create_empty_expr(type, sizeof(*expr)), | |
59 | struct lttng_event_expr_field, parent); | |
60 | ||
61 | if (!expr) { | |
62 | goto error; | |
63 | } | |
64 | ||
65 | assert(name); | |
66 | expr->name = strdup(name); | |
67 | if (!expr->name) { | |
68 | goto error; | |
69 | } | |
70 | ||
71 | goto end; | |
72 | ||
73 | error: | |
5b5ad96e FD |
74 | if (expr) { |
75 | lttng_event_expr_destroy(&expr->parent); | |
76 | } | |
77 | expr = NULL; | |
48c47564 PP |
78 | |
79 | end: | |
80 | return expr; | |
81 | } | |
82 | ||
83 | struct lttng_event_expr *lttng_event_expr_event_payload_field_create( | |
84 | const char *field_name) | |
85 | { | |
86 | struct lttng_event_expr *expr = NULL; | |
87 | ||
88 | if (!field_name) { | |
89 | goto end; | |
90 | } | |
91 | ||
92 | expr = &create_field_event_expr( | |
93 | LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD, | |
94 | field_name)->parent; | |
95 | ||
96 | end: | |
97 | return expr; | |
98 | } | |
99 | ||
100 | struct lttng_event_expr *lttng_event_expr_channel_context_field_create( | |
101 | const char *field_name) | |
102 | { | |
103 | struct lttng_event_expr *expr = NULL; | |
104 | ||
105 | if (!field_name) { | |
106 | goto end; | |
107 | } | |
108 | ||
109 | expr = &create_field_event_expr( | |
110 | LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD, | |
111 | field_name)->parent; | |
112 | ||
113 | end: | |
114 | return expr; | |
115 | } | |
116 | ||
117 | struct lttng_event_expr *lttng_event_expr_app_specific_context_field_create( | |
118 | const char *provider_name, const char *type_name) | |
119 | { | |
120 | struct lttng_event_expr_app_specific_context_field *expr = NULL; | |
5b5ad96e | 121 | struct lttng_event_expr *ret_parent_expr; |
48c47564 PP |
122 | |
123 | if (!type_name || !provider_name) { | |
124 | goto error; | |
125 | } | |
126 | ||
127 | expr = container_of(create_empty_expr( | |
128 | LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD, | |
129 | sizeof(*expr)), | |
130 | struct lttng_event_expr_app_specific_context_field, | |
131 | parent); | |
132 | if (!expr) { | |
133 | goto error; | |
134 | } | |
135 | ||
136 | expr->provider_name = strdup(provider_name); | |
137 | if (!expr->provider_name) { | |
138 | goto error; | |
139 | } | |
140 | ||
141 | expr->type_name = strdup(type_name); | |
142 | if (!expr->type_name) { | |
143 | goto error; | |
144 | } | |
145 | ||
5b5ad96e | 146 | ret_parent_expr = &expr->parent; |
48c47564 PP |
147 | goto end; |
148 | ||
149 | error: | |
5b5ad96e FD |
150 | if (expr) { |
151 | lttng_event_expr_destroy(&expr->parent); | |
152 | } | |
153 | ret_parent_expr = NULL; | |
48c47564 PP |
154 | |
155 | end: | |
5b5ad96e | 156 | return ret_parent_expr; |
48c47564 PP |
157 | } |
158 | ||
159 | struct lttng_event_expr *lttng_event_expr_array_field_element_create( | |
160 | struct lttng_event_expr *array_field_expr, | |
161 | unsigned int index) | |
162 | { | |
163 | struct lttng_event_expr_array_field_element *expr = NULL; | |
5b5ad96e | 164 | struct lttng_event_expr *ret_parent_expr; |
48c47564 PP |
165 | |
166 | /* The parent array field expression must be an l-value */ | |
167 | if (!array_field_expr || | |
168 | !lttng_event_expr_is_lvalue(array_field_expr)) { | |
169 | goto error; | |
170 | } | |
171 | ||
172 | expr = container_of(create_empty_expr( | |
173 | LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT, | |
174 | sizeof(*expr)), | |
175 | struct lttng_event_expr_array_field_element, | |
176 | parent); | |
177 | if (!expr) { | |
178 | goto error; | |
179 | } | |
180 | ||
181 | expr->array_field_expr = array_field_expr; | |
182 | expr->index = index; | |
5b5ad96e | 183 | ret_parent_expr = &expr->parent; |
48c47564 PP |
184 | goto end; |
185 | ||
186 | error: | |
5b5ad96e FD |
187 | if (expr) { |
188 | lttng_event_expr_destroy(&expr->parent); | |
189 | } | |
190 | ret_parent_expr = NULL; | |
48c47564 PP |
191 | |
192 | end: | |
5b5ad96e | 193 | return ret_parent_expr; |
48c47564 PP |
194 | } |
195 | ||
196 | const char *lttng_event_expr_event_payload_field_get_name( | |
197 | const struct lttng_event_expr *expr) | |
198 | { | |
199 | const char *ret = NULL; | |
200 | ||
201 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD) { | |
202 | goto end; | |
203 | } | |
204 | ||
205 | ret = container_of(expr, | |
206 | const struct lttng_event_expr_field, parent)->name; | |
207 | ||
208 | end: | |
209 | return ret; | |
210 | } | |
211 | ||
212 | const char *lttng_event_expr_channel_context_field_get_name( | |
213 | const struct lttng_event_expr *expr) | |
214 | { | |
215 | const char *ret = NULL; | |
216 | ||
217 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD) { | |
218 | goto end; | |
219 | } | |
220 | ||
221 | ret = container_of(expr, | |
222 | const struct lttng_event_expr_field, parent)->name; | |
223 | ||
224 | end: | |
225 | return ret; | |
226 | } | |
227 | ||
228 | const char *lttng_event_expr_app_specific_context_field_get_provider_name( | |
229 | const struct lttng_event_expr *expr) | |
230 | { | |
231 | const char *ret = NULL; | |
232 | ||
233 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { | |
234 | goto end; | |
235 | } | |
236 | ||
237 | ret = container_of(expr, | |
238 | const struct lttng_event_expr_app_specific_context_field, | |
239 | parent)->provider_name; | |
240 | ||
241 | end: | |
242 | return ret; | |
243 | } | |
244 | ||
245 | const char *lttng_event_expr_app_specific_context_field_get_type_name( | |
246 | const struct lttng_event_expr *expr) | |
247 | { | |
248 | const char *ret = NULL; | |
249 | ||
250 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { | |
251 | goto end; | |
252 | } | |
253 | ||
254 | ret = container_of(expr, | |
255 | const struct lttng_event_expr_app_specific_context_field, | |
256 | parent)->type_name; | |
257 | ||
258 | end: | |
259 | return ret; | |
260 | } | |
261 | ||
262 | const struct lttng_event_expr * | |
263 | lttng_event_expr_array_field_element_get_parent_expr( | |
264 | const struct lttng_event_expr *expr) | |
265 | { | |
266 | const struct lttng_event_expr *ret = NULL; | |
267 | ||
268 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT) { | |
269 | goto end; | |
270 | } | |
271 | ||
272 | ret = container_of(expr, | |
273 | const struct lttng_event_expr_array_field_element, | |
274 | parent)->array_field_expr; | |
275 | ||
276 | end: | |
277 | return ret; | |
278 | } | |
279 | ||
280 | enum lttng_event_expr_status lttng_event_expr_array_field_element_get_index( | |
281 | const struct lttng_event_expr *expr, unsigned int *index) | |
282 | { | |
283 | enum lttng_event_expr_status ret = LTTNG_EVENT_EXPR_STATUS_OK; | |
284 | ||
285 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT || | |
286 | !index) { | |
287 | ret = LTTNG_EVENT_EXPR_STATUS_INVALID; | |
288 | goto end; | |
289 | } | |
290 | ||
291 | *index = container_of(expr, | |
292 | const struct lttng_event_expr_array_field_element, | |
293 | parent)->index; | |
294 | ||
295 | end: | |
296 | return ret; | |
297 | } | |
298 | ||
299 | bool lttng_event_expr_is_equal(const struct lttng_event_expr *expr_a, | |
300 | const struct lttng_event_expr *expr_b) | |
301 | { | |
302 | bool is_equal = true; | |
303 | ||
304 | if (!expr_a && !expr_b) { | |
305 | /* Both `NULL`: equal */ | |
306 | goto end; | |
307 | } | |
308 | ||
309 | if (!expr_a || !expr_b) { | |
310 | /* Only one `NULL`: not equal */ | |
311 | goto not_equal; | |
312 | } | |
313 | ||
314 | if (expr_a->type != expr_b->type) { | |
315 | /* Different types: not equal */ | |
316 | goto not_equal; | |
317 | } | |
318 | ||
319 | switch (expr_a->type) { | |
320 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
321 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
322 | { | |
323 | const struct lttng_event_expr_field *field_expr_a = | |
324 | container_of(expr_a, | |
325 | const struct lttng_event_expr_field, | |
326 | parent); | |
327 | const struct lttng_event_expr_field *field_expr_b = | |
328 | container_of(expr_b, | |
329 | const struct lttng_event_expr_field, | |
330 | parent); | |
331 | ||
332 | if (strcmp(field_expr_a->name, field_expr_b->name) != 0) { | |
333 | goto not_equal; | |
334 | } | |
335 | ||
336 | break; | |
337 | } | |
338 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
339 | { | |
340 | const struct lttng_event_expr_app_specific_context_field *field_expr_a = | |
341 | container_of(expr_a, | |
342 | const struct lttng_event_expr_app_specific_context_field, | |
343 | parent); | |
344 | const struct lttng_event_expr_app_specific_context_field *field_expr_b = | |
345 | container_of(expr_b, | |
346 | const struct lttng_event_expr_app_specific_context_field, | |
347 | parent); | |
348 | ||
349 | if (strcmp(field_expr_a->provider_name, | |
350 | field_expr_b->provider_name) != 0) { | |
351 | goto not_equal; | |
352 | } | |
353 | ||
354 | if (strcmp(field_expr_a->type_name, | |
355 | field_expr_b->type_name) != 0) { | |
356 | goto not_equal; | |
357 | } | |
358 | ||
359 | break; | |
360 | } | |
361 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
362 | { | |
363 | const struct lttng_event_expr_array_field_element *elem_expr_a = | |
364 | container_of(expr_a, | |
365 | const struct lttng_event_expr_array_field_element, | |
366 | parent); | |
367 | const struct lttng_event_expr_array_field_element *elem_expr_b = | |
368 | container_of(expr_b, | |
369 | const struct lttng_event_expr_array_field_element, | |
370 | parent); | |
371 | ||
372 | if (!lttng_event_expr_is_equal(elem_expr_a->array_field_expr, | |
373 | elem_expr_b->array_field_expr)) { | |
374 | goto not_equal; | |
375 | } | |
376 | ||
377 | if (elem_expr_a->index != elem_expr_b->index) { | |
378 | goto not_equal; | |
379 | } | |
380 | ||
381 | break; | |
382 | } | |
383 | default: | |
384 | break; | |
385 | } | |
386 | ||
387 | goto end; | |
388 | ||
389 | not_equal: | |
390 | is_equal = false; | |
391 | ||
392 | end: | |
393 | return is_equal; | |
394 | } | |
395 | ||
396 | void lttng_event_expr_destroy(struct lttng_event_expr *expr) | |
397 | { | |
398 | if (!expr) { | |
399 | goto end; | |
400 | } | |
401 | ||
402 | switch (expr->type) { | |
403 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
404 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
405 | { | |
406 | struct lttng_event_expr_field *field_expr = | |
407 | container_of(expr, | |
408 | struct lttng_event_expr_field, parent); | |
409 | ||
410 | free(field_expr->name); | |
411 | break; | |
412 | } | |
413 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
414 | { | |
415 | struct lttng_event_expr_app_specific_context_field *field_expr = | |
416 | container_of(expr, | |
417 | struct lttng_event_expr_app_specific_context_field, | |
418 | parent); | |
419 | ||
420 | free(field_expr->provider_name); | |
421 | free(field_expr->type_name); | |
422 | break; | |
423 | } | |
424 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
425 | { | |
426 | struct lttng_event_expr_array_field_element *elem_expr = | |
427 | container_of(expr, | |
428 | struct lttng_event_expr_array_field_element, | |
429 | parent); | |
430 | ||
431 | lttng_event_expr_destroy(elem_expr->array_field_expr); | |
432 | break; | |
433 | } | |
434 | default: | |
435 | break; | |
436 | } | |
437 | ||
438 | free(expr); | |
439 | ||
440 | end: | |
441 | return; | |
442 | } |