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48c47564 PP |
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: | |
5b5ad96e FD |
76 | if (expr) { |
77 | lttng_event_expr_destroy(&expr->parent); | |
78 | } | |
79 | expr = NULL; | |
48c47564 PP |
80 | |
81 | end: | |
82 | return expr; | |
83 | } | |
84 | ||
85 | struct lttng_event_expr *lttng_event_expr_event_payload_field_create( | |
86 | const char *field_name) | |
87 | { | |
88 | struct lttng_event_expr *expr = NULL; | |
89 | ||
90 | if (!field_name) { | |
91 | goto end; | |
92 | } | |
93 | ||
94 | expr = &create_field_event_expr( | |
95 | LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD, | |
96 | field_name)->parent; | |
97 | ||
98 | end: | |
99 | return expr; | |
100 | } | |
101 | ||
102 | struct lttng_event_expr *lttng_event_expr_channel_context_field_create( | |
103 | const char *field_name) | |
104 | { | |
105 | struct lttng_event_expr *expr = NULL; | |
106 | ||
107 | if (!field_name) { | |
108 | goto end; | |
109 | } | |
110 | ||
111 | expr = &create_field_event_expr( | |
112 | LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD, | |
113 | field_name)->parent; | |
114 | ||
115 | end: | |
116 | return expr; | |
117 | } | |
118 | ||
119 | struct lttng_event_expr *lttng_event_expr_app_specific_context_field_create( | |
120 | const char *provider_name, const char *type_name) | |
121 | { | |
122 | struct lttng_event_expr_app_specific_context_field *expr = NULL; | |
5b5ad96e | 123 | struct lttng_event_expr *ret_parent_expr; |
48c47564 PP |
124 | |
125 | if (!type_name || !provider_name) { | |
126 | goto error; | |
127 | } | |
128 | ||
129 | expr = container_of(create_empty_expr( | |
130 | LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD, | |
131 | sizeof(*expr)), | |
132 | struct lttng_event_expr_app_specific_context_field, | |
133 | parent); | |
134 | if (!expr) { | |
135 | goto error; | |
136 | } | |
137 | ||
138 | expr->provider_name = strdup(provider_name); | |
139 | if (!expr->provider_name) { | |
140 | goto error; | |
141 | } | |
142 | ||
143 | expr->type_name = strdup(type_name); | |
144 | if (!expr->type_name) { | |
145 | goto error; | |
146 | } | |
147 | ||
5b5ad96e | 148 | ret_parent_expr = &expr->parent; |
48c47564 PP |
149 | goto end; |
150 | ||
151 | error: | |
5b5ad96e FD |
152 | if (expr) { |
153 | lttng_event_expr_destroy(&expr->parent); | |
154 | } | |
155 | ret_parent_expr = NULL; | |
48c47564 PP |
156 | |
157 | end: | |
5b5ad96e | 158 | return ret_parent_expr; |
48c47564 PP |
159 | } |
160 | ||
161 | struct lttng_event_expr *lttng_event_expr_array_field_element_create( | |
162 | struct lttng_event_expr *array_field_expr, | |
163 | unsigned int index) | |
164 | { | |
165 | struct lttng_event_expr_array_field_element *expr = NULL; | |
5b5ad96e | 166 | struct lttng_event_expr *ret_parent_expr; |
48c47564 PP |
167 | |
168 | /* The parent array field expression must be an l-value */ | |
169 | if (!array_field_expr || | |
170 | !lttng_event_expr_is_lvalue(array_field_expr)) { | |
171 | goto error; | |
172 | } | |
173 | ||
174 | expr = container_of(create_empty_expr( | |
175 | LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT, | |
176 | sizeof(*expr)), | |
177 | struct lttng_event_expr_array_field_element, | |
178 | parent); | |
179 | if (!expr) { | |
180 | goto error; | |
181 | } | |
182 | ||
183 | expr->array_field_expr = array_field_expr; | |
184 | expr->index = index; | |
5b5ad96e | 185 | ret_parent_expr = &expr->parent; |
48c47564 PP |
186 | goto end; |
187 | ||
188 | error: | |
5b5ad96e FD |
189 | if (expr) { |
190 | lttng_event_expr_destroy(&expr->parent); | |
191 | } | |
192 | ret_parent_expr = NULL; | |
48c47564 PP |
193 | |
194 | end: | |
5b5ad96e | 195 | return ret_parent_expr; |
48c47564 PP |
196 | } |
197 | ||
198 | const char *lttng_event_expr_event_payload_field_get_name( | |
199 | const struct lttng_event_expr *expr) | |
200 | { | |
201 | const char *ret = NULL; | |
202 | ||
203 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD) { | |
204 | goto end; | |
205 | } | |
206 | ||
207 | ret = container_of(expr, | |
208 | const struct lttng_event_expr_field, parent)->name; | |
209 | ||
210 | end: | |
211 | return ret; | |
212 | } | |
213 | ||
214 | const char *lttng_event_expr_channel_context_field_get_name( | |
215 | const struct lttng_event_expr *expr) | |
216 | { | |
217 | const char *ret = NULL; | |
218 | ||
219 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD) { | |
220 | goto end; | |
221 | } | |
222 | ||
223 | ret = container_of(expr, | |
224 | const struct lttng_event_expr_field, parent)->name; | |
225 | ||
226 | end: | |
227 | return ret; | |
228 | } | |
229 | ||
230 | const char *lttng_event_expr_app_specific_context_field_get_provider_name( | |
231 | const struct lttng_event_expr *expr) | |
232 | { | |
233 | const char *ret = NULL; | |
234 | ||
235 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { | |
236 | goto end; | |
237 | } | |
238 | ||
239 | ret = container_of(expr, | |
240 | const struct lttng_event_expr_app_specific_context_field, | |
241 | parent)->provider_name; | |
242 | ||
243 | end: | |
244 | return ret; | |
245 | } | |
246 | ||
247 | const char *lttng_event_expr_app_specific_context_field_get_type_name( | |
248 | const struct lttng_event_expr *expr) | |
249 | { | |
250 | const char *ret = NULL; | |
251 | ||
252 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) { | |
253 | goto end; | |
254 | } | |
255 | ||
256 | ret = container_of(expr, | |
257 | const struct lttng_event_expr_app_specific_context_field, | |
258 | parent)->type_name; | |
259 | ||
260 | end: | |
261 | return ret; | |
262 | } | |
263 | ||
264 | const struct lttng_event_expr * | |
265 | lttng_event_expr_array_field_element_get_parent_expr( | |
266 | const struct lttng_event_expr *expr) | |
267 | { | |
268 | const struct lttng_event_expr *ret = NULL; | |
269 | ||
270 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT) { | |
271 | goto end; | |
272 | } | |
273 | ||
274 | ret = container_of(expr, | |
275 | const struct lttng_event_expr_array_field_element, | |
276 | parent)->array_field_expr; | |
277 | ||
278 | end: | |
279 | return ret; | |
280 | } | |
281 | ||
282 | enum lttng_event_expr_status lttng_event_expr_array_field_element_get_index( | |
283 | const struct lttng_event_expr *expr, unsigned int *index) | |
284 | { | |
285 | enum lttng_event_expr_status ret = LTTNG_EVENT_EXPR_STATUS_OK; | |
286 | ||
287 | if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT || | |
288 | !index) { | |
289 | ret = LTTNG_EVENT_EXPR_STATUS_INVALID; | |
290 | goto end; | |
291 | } | |
292 | ||
293 | *index = container_of(expr, | |
294 | const struct lttng_event_expr_array_field_element, | |
295 | parent)->index; | |
296 | ||
297 | end: | |
298 | return ret; | |
299 | } | |
300 | ||
301 | bool lttng_event_expr_is_equal(const struct lttng_event_expr *expr_a, | |
302 | const struct lttng_event_expr *expr_b) | |
303 | { | |
304 | bool is_equal = true; | |
305 | ||
306 | if (!expr_a && !expr_b) { | |
307 | /* Both `NULL`: equal */ | |
308 | goto end; | |
309 | } | |
310 | ||
311 | if (!expr_a || !expr_b) { | |
312 | /* Only one `NULL`: not equal */ | |
313 | goto not_equal; | |
314 | } | |
315 | ||
316 | if (expr_a->type != expr_b->type) { | |
317 | /* Different types: not equal */ | |
318 | goto not_equal; | |
319 | } | |
320 | ||
321 | switch (expr_a->type) { | |
322 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
323 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
324 | { | |
325 | const struct lttng_event_expr_field *field_expr_a = | |
326 | container_of(expr_a, | |
327 | const struct lttng_event_expr_field, | |
328 | parent); | |
329 | const struct lttng_event_expr_field *field_expr_b = | |
330 | container_of(expr_b, | |
331 | const struct lttng_event_expr_field, | |
332 | parent); | |
333 | ||
334 | if (strcmp(field_expr_a->name, field_expr_b->name) != 0) { | |
335 | goto not_equal; | |
336 | } | |
337 | ||
338 | break; | |
339 | } | |
340 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
341 | { | |
342 | const struct lttng_event_expr_app_specific_context_field *field_expr_a = | |
343 | container_of(expr_a, | |
344 | const struct lttng_event_expr_app_specific_context_field, | |
345 | parent); | |
346 | const struct lttng_event_expr_app_specific_context_field *field_expr_b = | |
347 | container_of(expr_b, | |
348 | const struct lttng_event_expr_app_specific_context_field, | |
349 | parent); | |
350 | ||
351 | if (strcmp(field_expr_a->provider_name, | |
352 | field_expr_b->provider_name) != 0) { | |
353 | goto not_equal; | |
354 | } | |
355 | ||
356 | if (strcmp(field_expr_a->type_name, | |
357 | field_expr_b->type_name) != 0) { | |
358 | goto not_equal; | |
359 | } | |
360 | ||
361 | break; | |
362 | } | |
363 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
364 | { | |
365 | const struct lttng_event_expr_array_field_element *elem_expr_a = | |
366 | container_of(expr_a, | |
367 | const struct lttng_event_expr_array_field_element, | |
368 | parent); | |
369 | const struct lttng_event_expr_array_field_element *elem_expr_b = | |
370 | container_of(expr_b, | |
371 | const struct lttng_event_expr_array_field_element, | |
372 | parent); | |
373 | ||
374 | if (!lttng_event_expr_is_equal(elem_expr_a->array_field_expr, | |
375 | elem_expr_b->array_field_expr)) { | |
376 | goto not_equal; | |
377 | } | |
378 | ||
379 | if (elem_expr_a->index != elem_expr_b->index) { | |
380 | goto not_equal; | |
381 | } | |
382 | ||
383 | break; | |
384 | } | |
385 | default: | |
386 | break; | |
387 | } | |
388 | ||
389 | goto end; | |
390 | ||
391 | not_equal: | |
392 | is_equal = false; | |
393 | ||
394 | end: | |
395 | return is_equal; | |
396 | } | |
397 | ||
398 | void lttng_event_expr_destroy(struct lttng_event_expr *expr) | |
399 | { | |
400 | if (!expr) { | |
401 | goto end; | |
402 | } | |
403 | ||
404 | switch (expr->type) { | |
405 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
406 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
407 | { | |
408 | struct lttng_event_expr_field *field_expr = | |
409 | container_of(expr, | |
410 | struct lttng_event_expr_field, parent); | |
411 | ||
412 | free(field_expr->name); | |
413 | break; | |
414 | } | |
415 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
416 | { | |
417 | struct lttng_event_expr_app_specific_context_field *field_expr = | |
418 | container_of(expr, | |
419 | struct lttng_event_expr_app_specific_context_field, | |
420 | parent); | |
421 | ||
422 | free(field_expr->provider_name); | |
423 | free(field_expr->type_name); | |
424 | break; | |
425 | } | |
426 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
427 | { | |
428 | struct lttng_event_expr_array_field_element *elem_expr = | |
429 | container_of(expr, | |
430 | struct lttng_event_expr_array_field_element, | |
431 | parent); | |
432 | ||
433 | lttng_event_expr_destroy(elem_expr->array_field_expr); | |
434 | break; | |
435 | } | |
436 | default: | |
437 | break; | |
438 | } | |
439 | ||
440 | free(expr); | |
441 | ||
442 | end: | |
443 | return; | |
444 | } |