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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: | |
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 | } |