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2463b787 JR |
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 | urcu_ref_init(&expr->ref); | |
48 | expr->type = type; | |
49 | ||
50 | end: | |
51 | return expr; | |
52 | } | |
53 | ||
54 | static | |
55 | struct lttng_event_expr_field *create_field_event_expr( | |
56 | enum lttng_event_expr_type type, | |
57 | const char *name) | |
58 | { | |
59 | struct lttng_event_expr_field *expr = | |
60 | container_of( | |
61 | create_empty_expr(type, sizeof(*expr)), | |
62 | struct lttng_event_expr_field, parent); | |
63 | ||
64 | if (!expr) { | |
65 | goto error; | |
66 | } | |
67 | ||
68 | assert(name); | |
69 | expr->name = strdup(name); | |
70 | if (!expr->name) { | |
71 | goto error; | |
72 | } | |
73 | ||
74 | goto end; | |
75 | ||
76 | error: | |
77 | lttng_event_expr_destroy(&expr->parent); | |
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; | |
121 | ||
122 | if (!type_name || !provider_name) { | |
123 | goto error; | |
124 | } | |
125 | ||
126 | expr = container_of(create_empty_expr( | |
127 | LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD, | |
128 | sizeof(*expr)), | |
129 | struct lttng_event_expr_app_specific_context_field, | |
130 | parent); | |
131 | if (!expr) { | |
132 | goto error; | |
133 | } | |
134 | ||
135 | expr->provider_name = strdup(provider_name); | |
136 | if (!expr->provider_name) { | |
137 | goto error; | |
138 | } | |
139 | ||
140 | expr->type_name = strdup(type_name); | |
141 | if (!expr->type_name) { | |
142 | goto error; | |
143 | } | |
144 | ||
145 | goto end; | |
146 | ||
147 | error: | |
148 | lttng_event_expr_destroy(&expr->parent); | |
149 | ||
150 | end: | |
151 | return &expr->parent; | |
152 | } | |
153 | ||
154 | struct lttng_event_expr *lttng_event_expr_array_field_element_create( | |
155 | struct lttng_event_expr *array_field_expr, | |
156 | unsigned int index) | |
157 | { | |
158 | struct lttng_event_expr_array_field_element *expr = NULL; | |
159 | ||
160 | /* The parent array field expression must be an l-value */ | |
161 | if (!array_field_expr || | |
162 | !lttng_event_expr_is_lvalue(array_field_expr)) { | |
163 | goto error; | |
164 | } | |
165 | ||
166 | expr = container_of(create_empty_expr( | |
167 | LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT, | |
168 | sizeof(*expr)), | |
169 | struct lttng_event_expr_array_field_element, | |
170 | parent); | |
171 | if (!expr) { | |
172 | goto error; | |
173 | } | |
174 | ||
175 | expr->array_field_expr = array_field_expr; | |
176 | expr->index = index; | |
177 | goto end; | |
178 | ||
179 | error: | |
180 | lttng_event_expr_destroy(&expr->parent); | |
181 | ||
182 | end: | |
183 | return &expr->parent; | |
184 | } | |
185 | ||
186 | const char *lttng_event_expr_event_payload_field_get_name( | |
187 | const struct lttng_event_expr *expr) | |
188 | { | |
189 | const char *ret = NULL; | |
190 | ||
191 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD) { | |
192 | goto end; | |
193 | } | |
194 | ||
195 | ret = container_of(expr, | |
196 | const struct lttng_event_expr_field, parent)->name; | |
197 | ||
198 | end: | |
199 | return ret; | |
200 | } | |
201 | ||
202 | const char *lttng_event_expr_channel_context_field_get_name( | |
203 | const struct lttng_event_expr *expr) | |
204 | { | |
205 | const char *ret = NULL; | |
206 | ||
207 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD) { | |
208 | goto end; | |
209 | } | |
210 | ||
211 | ret = container_of(expr, | |
212 | const struct lttng_event_expr_field, parent)->name; | |
213 | ||
214 | end: | |
215 | return ret; | |
216 | } | |
217 | ||
218 | const char *lttng_event_expr_app_specific_context_field_get_provider_name( | |
219 | const struct lttng_event_expr *expr) | |
220 | { | |
221 | const char *ret = NULL; | |
222 | ||
223 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { | |
224 | goto end; | |
225 | } | |
226 | ||
227 | ret = container_of(expr, | |
228 | const struct lttng_event_expr_app_specific_context_field, | |
229 | parent)->provider_name; | |
230 | ||
231 | end: | |
232 | return ret; | |
233 | } | |
234 | ||
235 | const char *lttng_event_expr_app_specific_context_field_get_type_name( | |
236 | const struct lttng_event_expr *expr) | |
237 | { | |
238 | const char *ret = NULL; | |
239 | ||
240 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { | |
241 | goto end; | |
242 | } | |
243 | ||
244 | ret = container_of(expr, | |
245 | const struct lttng_event_expr_app_specific_context_field, | |
246 | parent)->type_name; | |
247 | ||
248 | end: | |
249 | return ret; | |
250 | } | |
251 | ||
252 | const struct lttng_event_expr * | |
253 | lttng_event_expr_array_field_element_get_parent_expr( | |
254 | const struct lttng_event_expr *expr) | |
255 | { | |
256 | const struct lttng_event_expr *ret = NULL; | |
257 | ||
258 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT) { | |
259 | goto end; | |
260 | } | |
261 | ||
262 | ret = container_of(expr, | |
263 | const struct lttng_event_expr_array_field_element, | |
264 | parent)->array_field_expr; | |
265 | ||
266 | end: | |
267 | return ret; | |
268 | } | |
269 | ||
270 | enum lttng_event_expr_status lttng_event_expr_array_field_element_get_index( | |
271 | const struct lttng_event_expr *expr, unsigned int *index) | |
272 | { | |
273 | enum lttng_event_expr_status ret = LTTNG_EVENT_EXPR_STATUS_OK; | |
274 | ||
275 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT || | |
276 | !index) { | |
277 | ret = LTTNG_EVENT_EXPR_STATUS_INVALID; | |
278 | goto end; | |
279 | } | |
280 | ||
281 | *index = container_of(expr, | |
282 | const struct lttng_event_expr_array_field_element, | |
283 | parent)->index; | |
284 | ||
285 | end: | |
286 | return ret; | |
287 | } | |
288 | ||
289 | bool lttng_event_expr_is_equal(const struct lttng_event_expr *expr_a, | |
290 | const struct lttng_event_expr *expr_b) | |
291 | { | |
292 | bool is_equal = true; | |
293 | ||
294 | if (!expr_a && !expr_b) { | |
295 | /* Both `NULL`: equal */ | |
296 | goto end; | |
297 | } | |
298 | ||
299 | if (!expr_a || !expr_b) { | |
300 | /* Only one `NULL`: not equal */ | |
301 | goto not_equal; | |
302 | } | |
303 | ||
304 | if (expr_a->type != expr_b->type) { | |
305 | /* Different types: not equal */ | |
306 | goto not_equal; | |
307 | } | |
308 | ||
309 | switch (expr_a->type) { | |
310 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
311 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
312 | { | |
313 | const struct lttng_event_expr_field *field_expr_a = | |
314 | container_of(expr_a, | |
315 | const struct lttng_event_expr_field, | |
316 | parent); | |
317 | const struct lttng_event_expr_field *field_expr_b = | |
318 | container_of(expr_b, | |
319 | const struct lttng_event_expr_field, | |
320 | parent); | |
321 | ||
322 | if (strcmp(field_expr_a->name, field_expr_b->name) != 0) { | |
323 | goto not_equal; | |
324 | } | |
325 | ||
326 | break; | |
327 | } | |
328 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
329 | { | |
330 | const struct lttng_event_expr_app_specific_context_field *field_expr_a = | |
331 | container_of(expr_a, | |
332 | const struct lttng_event_expr_app_specific_context_field, | |
333 | parent); | |
334 | const struct lttng_event_expr_app_specific_context_field *field_expr_b = | |
335 | container_of(expr_b, | |
336 | const struct lttng_event_expr_app_specific_context_field, | |
337 | parent); | |
338 | ||
339 | if (strcmp(field_expr_a->provider_name, | |
340 | field_expr_b->provider_name) != 0) { | |
341 | goto not_equal; | |
342 | } | |
343 | ||
344 | if (strcmp(field_expr_a->type_name, | |
345 | field_expr_b->type_name) != 0) { | |
346 | goto not_equal; | |
347 | } | |
348 | ||
349 | break; | |
350 | } | |
351 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
352 | { | |
353 | const struct lttng_event_expr_array_field_element *elem_expr_a = | |
354 | container_of(expr_a, | |
355 | const struct lttng_event_expr_array_field_element, | |
356 | parent); | |
357 | const struct lttng_event_expr_array_field_element *elem_expr_b = | |
358 | container_of(expr_b, | |
359 | const struct lttng_event_expr_array_field_element, | |
360 | parent); | |
361 | ||
362 | if (!lttng_event_expr_is_equal(elem_expr_a->array_field_expr, | |
363 | elem_expr_b->array_field_expr)) { | |
364 | goto not_equal; | |
365 | } | |
366 | ||
367 | if (elem_expr_a->index != elem_expr_b->index) { | |
368 | goto not_equal; | |
369 | } | |
370 | ||
371 | break; | |
372 | } | |
373 | default: | |
374 | break; | |
375 | } | |
376 | ||
377 | goto end; | |
378 | ||
379 | not_equal: | |
380 | is_equal = false; | |
381 | ||
382 | end: | |
383 | return is_equal; | |
384 | } | |
385 | ||
386 | static | |
387 | void event_expr_destroy_ref(struct urcu_ref *ref) | |
388 | { | |
389 | struct lttng_event_expr *expr = | |
390 | container_of(ref, struct lttng_event_expr, ref); | |
391 | ||
392 | switch (expr->type) { | |
393 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
394 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
395 | { | |
396 | struct lttng_event_expr_field *field_expr = | |
397 | container_of(expr, | |
398 | struct lttng_event_expr_field, parent); | |
399 | ||
400 | free(field_expr->name); | |
401 | break; | |
402 | } | |
403 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
404 | { | |
405 | struct lttng_event_expr_app_specific_context_field *field_expr = | |
406 | container_of(expr, | |
407 | struct lttng_event_expr_app_specific_context_field, | |
408 | parent); | |
409 | ||
410 | free(field_expr->provider_name); | |
411 | free(field_expr->type_name); | |
412 | break; | |
413 | } | |
414 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
415 | { | |
416 | struct lttng_event_expr_array_field_element *elem_expr = | |
417 | container_of(expr, | |
418 | struct lttng_event_expr_array_field_element, | |
419 | parent); | |
420 | ||
421 | lttng_event_expr_destroy(elem_expr->array_field_expr); | |
422 | break; | |
423 | } | |
424 | default: | |
425 | break; | |
426 | } | |
427 | ||
428 | free(expr); | |
429 | } | |
430 | ||
431 | LTTNG_HIDDEN | |
432 | void lttng_event_expr_get(struct lttng_event_expr *expr) | |
433 | { | |
434 | urcu_ref_get(&expr->ref); | |
435 | } | |
436 | ||
437 | LTTNG_HIDDEN | |
438 | void lttng_event_expr_put(struct lttng_event_expr *expr) { | |
439 | if(!expr) { | |
440 | return; | |
441 | } | |
442 | urcu_ref_put(&expr->ref, event_expr_destroy_ref); | |
443 | } | |
444 | ||
445 | void lttng_event_expr_destroy(struct lttng_event_expr *expr) | |
446 | { | |
447 | lttng_event_expr_put(expr); | |
448 | return; | |
449 | } |