Commit | Line | Data |
---|---|---|
2d78951a MD |
1 | /* |
2 | * lttng-filter.c | |
3 | * | |
4 | * LTTng UST filter code. | |
5 | * | |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <errno.h> | |
24 | #include <stdio.h> | |
25 | #include <helper.h> | |
26 | #include <lttng/ust-events.h> | |
cd54f6d9 MD |
27 | #include <stdint.h> |
28 | #include <errno.h> | |
29 | #include <string.h> | |
30 | #include <inttypes.h> | |
31 | #include <limits.h> | |
b1caea50 | 32 | #include <usterr-signal-safe.h> |
cd54f6d9 MD |
33 | #include "filter-bytecode.h" |
34 | ||
35 | #define NR_REG 2 | |
36 | ||
37 | #ifndef min_t | |
38 | #define min_t(type, a, b) \ | |
39 | ((type) (a) < (type) (b) ? (type) (a) : (type) (b)) | |
40 | #endif | |
41 | ||
42 | #ifndef likely | |
43 | #define likely(x) __builtin_expect(!!(x), 1) | |
44 | #endif | |
45 | ||
46 | #ifndef unlikely | |
47 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
48 | #endif | |
49 | ||
50 | #ifdef DEBUG | |
51 | #define dbg_printf(fmt, args...) printf("[debug bytecode] " fmt, ## args) | |
52 | #else | |
53 | #define dbg_printf(fmt, args...) \ | |
54 | do { \ | |
55 | /* do nothing but check printf format */ \ | |
56 | if (0) \ | |
57 | printf("[debug bytecode] " fmt, ## args); \ | |
58 | } while (0) | |
59 | #endif | |
60 | ||
61 | /* Linked bytecode */ | |
62 | struct bytecode_runtime { | |
63 | uint16_t len; | |
64 | char data[0]; | |
65 | }; | |
66 | ||
9522a886 MD |
67 | enum reg_type { |
68 | REG_S64, | |
69 | REG_DOUBLE, | |
70 | REG_STRING, | |
71 | }; | |
72 | ||
73 | /* Validation registers */ | |
74 | struct vreg { | |
75 | enum reg_type type; | |
76 | int literal; /* is string literal ? */ | |
77 | }; | |
78 | ||
79 | /* Execution registers */ | |
cd54f6d9 | 80 | struct reg { |
9522a886 | 81 | enum reg_type type; |
cd54f6d9 | 82 | int64_t v; |
da6eed25 | 83 | double d; |
cd54f6d9 MD |
84 | |
85 | const char *str; | |
86 | size_t seq_len; | |
87 | int literal; /* is string literal ? */ | |
88 | }; | |
89 | ||
90 | static const char *opnames[] = { | |
91 | [ FILTER_OP_UNKNOWN ] = "UNKNOWN", | |
92 | ||
93 | [ FILTER_OP_RETURN ] = "RETURN", | |
94 | ||
95 | /* binary */ | |
96 | [ FILTER_OP_MUL ] = "MUL", | |
97 | [ FILTER_OP_DIV ] = "DIV", | |
98 | [ FILTER_OP_MOD ] = "MOD", | |
99 | [ FILTER_OP_PLUS ] = "PLUS", | |
100 | [ FILTER_OP_MINUS ] = "MINUS", | |
101 | [ FILTER_OP_RSHIFT ] = "RSHIFT", | |
102 | [ FILTER_OP_LSHIFT ] = "LSHIFT", | |
103 | [ FILTER_OP_BIN_AND ] = "BIN_AND", | |
104 | [ FILTER_OP_BIN_OR ] = "BIN_OR", | |
105 | [ FILTER_OP_BIN_XOR ] = "BIN_XOR", | |
106 | [ FILTER_OP_EQ ] = "EQ", | |
107 | [ FILTER_OP_NE ] = "NE", | |
108 | [ FILTER_OP_GT ] = "GT", | |
109 | [ FILTER_OP_LT ] = "LT", | |
110 | [ FILTER_OP_GE ] = "GE", | |
111 | [ FILTER_OP_LE ] = "LE", | |
112 | ||
113 | /* unary */ | |
114 | [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS", | |
115 | [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
116 | [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT", | |
117 | ||
118 | /* logical */ | |
119 | [ FILTER_OP_AND ] = "AND", | |
120 | [ FILTER_OP_OR ] = "OR", | |
121 | ||
122 | /* load */ | |
123 | [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", | |
124 | [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", | |
125 | [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", | |
da6eed25 | 126 | [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", |
cd54f6d9 MD |
127 | }; |
128 | ||
129 | static | |
130 | const char *print_op(enum filter_op op) | |
131 | { | |
132 | if (op >= NR_FILTER_OPS) | |
133 | return "UNKNOWN"; | |
134 | else | |
135 | return opnames[op]; | |
136 | } | |
137 | ||
138 | /* | |
139 | * -1: wildcard found. | |
140 | * -2: unknown escape char. | |
141 | * 0: normal char. | |
142 | */ | |
143 | ||
144 | static | |
145 | int parse_char(const char **p) | |
146 | { | |
147 | switch (**p) { | |
148 | case '\\': | |
149 | (*p)++; | |
150 | switch (**p) { | |
151 | case '\\': | |
152 | case '*': | |
153 | return 0; | |
154 | default: | |
155 | return -2; | |
156 | } | |
157 | case '*': | |
158 | return -1; | |
159 | default: | |
160 | return 0; | |
161 | } | |
162 | } | |
163 | ||
164 | static | |
165 | int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type) | |
166 | { | |
167 | const char *p = reg[REG_R0].str, *q = reg[REG_R1].str; | |
168 | int ret; | |
169 | int diff; | |
170 | ||
171 | for (;;) { | |
172 | int escaped_r0 = 0; | |
173 | ||
174 | if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) { | |
175 | if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0') | |
176 | diff = 0; | |
177 | else | |
178 | diff = -1; | |
179 | break; | |
180 | } | |
181 | if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) { | |
182 | if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0') | |
183 | diff = 0; | |
184 | else | |
185 | diff = 1; | |
186 | break; | |
187 | } | |
188 | if (reg[REG_R0].literal) { | |
189 | ret = parse_char(&p); | |
190 | if (ret == -1) { | |
191 | return 0; | |
192 | } else if (ret == -2) { | |
193 | escaped_r0 = 1; | |
194 | } | |
195 | /* else compare both char */ | |
196 | } | |
197 | if (reg[REG_R1].literal) { | |
198 | ret = parse_char(&q); | |
199 | if (ret == -1) { | |
200 | return 0; | |
201 | } else if (ret == -2) { | |
202 | if (!escaped_r0) | |
203 | return -1; | |
204 | } else { | |
205 | if (escaped_r0) | |
206 | return 1; | |
207 | } | |
208 | } else { | |
209 | if (escaped_r0) | |
210 | return 1; | |
211 | } | |
212 | diff = *p - *q; | |
213 | if (diff != 0) | |
214 | break; | |
215 | p++; | |
216 | q++; | |
217 | } | |
218 | return diff; | |
219 | } | |
220 | ||
221 | static | |
222 | int lttng_filter_false(void *filter_data, | |
223 | const char *filter_stack_data) | |
224 | { | |
225 | return 0; | |
226 | } | |
2d78951a MD |
227 | |
228 | static | |
229 | int lttng_filter_interpret_bytecode(void *filter_data, | |
230 | const char *filter_stack_data) | |
231 | { | |
cd54f6d9 MD |
232 | struct bytecode_runtime *bytecode = filter_data; |
233 | void *pc, *next_pc, *start_pc; | |
234 | int ret = -EINVAL; | |
235 | int retval = 0; | |
236 | struct reg reg[NR_REG]; | |
237 | int i; | |
238 | ||
239 | for (i = 0; i < NR_REG; i++) { | |
240 | reg[i].type = REG_S64; | |
241 | reg[i].v = 0; | |
da6eed25 | 242 | reg[i].d = 0.0; |
cd54f6d9 MD |
243 | reg[i].str = NULL; |
244 | reg[i].seq_len = 0; | |
245 | reg[i].literal = 0; | |
246 | } | |
247 | ||
248 | start_pc = &bytecode->data[0]; | |
249 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
250 | pc = next_pc) { | |
cd54f6d9 MD |
251 | dbg_printf("Executing op %s (%u)\n", |
252 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
253 | (unsigned int) *(filter_opcode_t *) pc); | |
254 | switch (*(filter_opcode_t *) pc) { | |
255 | case FILTER_OP_UNKNOWN: | |
256 | default: | |
b1caea50 | 257 | ERR("unknown bytecode op %u\n", |
cd54f6d9 MD |
258 | (unsigned int) *(filter_opcode_t *) pc); |
259 | ret = -EINVAL; | |
260 | goto end; | |
261 | ||
262 | case FILTER_OP_RETURN: | |
263 | retval = !!reg[0].v; | |
264 | ret = 0; | |
265 | goto end; | |
266 | ||
267 | /* binary */ | |
268 | case FILTER_OP_MUL: | |
269 | case FILTER_OP_DIV: | |
270 | case FILTER_OP_MOD: | |
271 | case FILTER_OP_PLUS: | |
272 | case FILTER_OP_MINUS: | |
273 | case FILTER_OP_RSHIFT: | |
274 | case FILTER_OP_LSHIFT: | |
275 | case FILTER_OP_BIN_AND: | |
276 | case FILTER_OP_BIN_OR: | |
277 | case FILTER_OP_BIN_XOR: | |
b1caea50 | 278 | ERR("unsupported bytecode op %u\n", |
cd54f6d9 MD |
279 | (unsigned int) *(filter_opcode_t *) pc); |
280 | ret = -EINVAL; | |
281 | goto end; | |
282 | ||
283 | case FILTER_OP_EQ: | |
284 | { | |
cd54f6d9 MD |
285 | switch (reg[REG_R0].type) { |
286 | default: | |
b1caea50 | 287 | ERR("unknown register type\n"); |
cd54f6d9 MD |
288 | ret = -EINVAL; |
289 | goto end; | |
290 | ||
291 | case REG_STRING: | |
cd54f6d9 MD |
292 | reg[REG_R0].v = (reg_strcmp(reg, "==") == 0); |
293 | break; | |
294 | case REG_S64: | |
da6eed25 MD |
295 | switch (reg[REG_R1].type) { |
296 | default: | |
b1caea50 | 297 | ERR("unknown register type\n"); |
da6eed25 MD |
298 | ret = -EINVAL; |
299 | goto end; | |
300 | ||
301 | case REG_S64: | |
302 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v); | |
303 | break; | |
304 | case REG_DOUBLE: | |
305 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].d); | |
306 | break; | |
307 | } | |
308 | break; | |
309 | case REG_DOUBLE: | |
310 | switch (reg[REG_R1].type) { | |
311 | default: | |
b1caea50 | 312 | ERR("unknown register type\n"); |
da6eed25 MD |
313 | ret = -EINVAL; |
314 | goto end; | |
315 | ||
316 | case REG_S64: | |
317 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].v); | |
318 | break; | |
319 | case REG_DOUBLE: | |
320 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].d); | |
321 | break; | |
322 | } | |
cd54f6d9 MD |
323 | break; |
324 | } | |
325 | reg[REG_R0].type = REG_S64; | |
326 | next_pc += sizeof(struct binary_op); | |
327 | break; | |
328 | } | |
329 | case FILTER_OP_NE: | |
330 | { | |
cd54f6d9 MD |
331 | switch (reg[REG_R0].type) { |
332 | default: | |
b1caea50 | 333 | ERR("unknown register type\n"); |
cd54f6d9 MD |
334 | ret = -EINVAL; |
335 | goto end; | |
336 | ||
337 | case REG_STRING: | |
cd54f6d9 MD |
338 | reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0); |
339 | break; | |
340 | case REG_S64: | |
da6eed25 MD |
341 | switch (reg[REG_R1].type) { |
342 | default: | |
b1caea50 | 343 | ERR("unknown register type\n"); |
da6eed25 MD |
344 | ret = -EINVAL; |
345 | goto end; | |
346 | ||
347 | case REG_S64: | |
348 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v); | |
349 | break; | |
350 | case REG_DOUBLE: | |
351 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].d); | |
352 | break; | |
353 | } | |
354 | break; | |
355 | case REG_DOUBLE: | |
356 | switch (reg[REG_R1].type) { | |
357 | default: | |
b1caea50 | 358 | ERR("unknown register type\n"); |
da6eed25 MD |
359 | ret = -EINVAL; |
360 | goto end; | |
361 | ||
362 | case REG_S64: | |
363 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].v); | |
364 | break; | |
365 | case REG_DOUBLE: | |
366 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].d); | |
367 | break; | |
368 | } | |
cd54f6d9 MD |
369 | break; |
370 | } | |
371 | reg[REG_R0].type = REG_S64; | |
372 | next_pc += sizeof(struct binary_op); | |
373 | break; | |
374 | } | |
375 | case FILTER_OP_GT: | |
376 | { | |
cd54f6d9 MD |
377 | switch (reg[REG_R0].type) { |
378 | default: | |
b1caea50 | 379 | ERR("unknown register type\n"); |
cd54f6d9 MD |
380 | ret = -EINVAL; |
381 | goto end; | |
382 | ||
383 | case REG_STRING: | |
cd54f6d9 MD |
384 | reg[REG_R0].v = (reg_strcmp(reg, ">") > 0); |
385 | break; | |
386 | case REG_S64: | |
da6eed25 MD |
387 | switch (reg[REG_R1].type) { |
388 | default: | |
b1caea50 | 389 | ERR("unknown register type\n"); |
da6eed25 MD |
390 | ret = -EINVAL; |
391 | goto end; | |
392 | ||
393 | case REG_S64: | |
394 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v); | |
395 | break; | |
396 | case REG_DOUBLE: | |
397 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].d); | |
398 | break; | |
399 | } | |
400 | break; | |
401 | case REG_DOUBLE: | |
402 | switch (reg[REG_R1].type) { | |
403 | default: | |
b1caea50 | 404 | ERR("unknown register type\n"); |
da6eed25 MD |
405 | ret = -EINVAL; |
406 | goto end; | |
407 | ||
408 | case REG_S64: | |
409 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].v); | |
410 | break; | |
411 | case REG_DOUBLE: | |
412 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].d); | |
413 | break; | |
414 | } | |
cd54f6d9 MD |
415 | break; |
416 | } | |
417 | reg[REG_R0].type = REG_S64; | |
418 | next_pc += sizeof(struct binary_op); | |
419 | break; | |
420 | } | |
421 | case FILTER_OP_LT: | |
422 | { | |
cd54f6d9 MD |
423 | switch (reg[REG_R0].type) { |
424 | default: | |
b1caea50 | 425 | ERR("unknown register type\n"); |
cd54f6d9 MD |
426 | ret = -EINVAL; |
427 | goto end; | |
428 | ||
429 | case REG_STRING: | |
cd54f6d9 MD |
430 | reg[REG_R0].v = (reg_strcmp(reg, "<") < 0); |
431 | break; | |
432 | case REG_S64: | |
da6eed25 MD |
433 | switch (reg[REG_R1].type) { |
434 | default: | |
b1caea50 | 435 | ERR("unknown register type\n"); |
da6eed25 MD |
436 | ret = -EINVAL; |
437 | goto end; | |
438 | ||
439 | case REG_S64: | |
440 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v); | |
441 | break; | |
442 | case REG_DOUBLE: | |
443 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].d); | |
444 | break; | |
445 | } | |
446 | break; | |
447 | case REG_DOUBLE: | |
448 | switch (reg[REG_R1].type) { | |
449 | default: | |
b1caea50 | 450 | ERR("unknown register type\n"); |
da6eed25 MD |
451 | ret = -EINVAL; |
452 | goto end; | |
453 | ||
454 | case REG_S64: | |
455 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].v); | |
456 | break; | |
457 | case REG_DOUBLE: | |
458 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].d); | |
459 | break; | |
460 | } | |
cd54f6d9 MD |
461 | break; |
462 | } | |
463 | reg[REG_R0].type = REG_S64; | |
464 | next_pc += sizeof(struct binary_op); | |
465 | break; | |
466 | } | |
467 | case FILTER_OP_GE: | |
468 | { | |
cd54f6d9 MD |
469 | switch (reg[REG_R0].type) { |
470 | default: | |
b1caea50 | 471 | ERR("unknown register type\n"); |
cd54f6d9 MD |
472 | ret = -EINVAL; |
473 | goto end; | |
474 | ||
475 | case REG_STRING: | |
cd54f6d9 MD |
476 | reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0); |
477 | break; | |
478 | case REG_S64: | |
da6eed25 MD |
479 | switch (reg[REG_R1].type) { |
480 | default: | |
b1caea50 | 481 | ERR("unknown register type\n"); |
da6eed25 MD |
482 | ret = -EINVAL; |
483 | goto end; | |
484 | ||
485 | case REG_S64: | |
486 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v); | |
487 | break; | |
488 | case REG_DOUBLE: | |
489 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].d); | |
490 | break; | |
491 | } | |
492 | break; | |
493 | case REG_DOUBLE: | |
494 | switch (reg[REG_R1].type) { | |
495 | default: | |
b1caea50 | 496 | ERR("unknown register type\n"); |
da6eed25 MD |
497 | ret = -EINVAL; |
498 | goto end; | |
499 | ||
500 | case REG_S64: | |
501 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].v); | |
502 | break; | |
503 | case REG_DOUBLE: | |
504 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].d); | |
505 | break; | |
506 | } | |
cd54f6d9 MD |
507 | break; |
508 | } | |
509 | reg[REG_R0].type = REG_S64; | |
510 | next_pc += sizeof(struct binary_op); | |
511 | break; | |
512 | } | |
513 | case FILTER_OP_LE: | |
514 | { | |
cd54f6d9 MD |
515 | switch (reg[REG_R0].type) { |
516 | default: | |
b1caea50 | 517 | ERR("unknown register type\n"); |
cd54f6d9 MD |
518 | ret = -EINVAL; |
519 | goto end; | |
520 | ||
521 | case REG_STRING: | |
cd54f6d9 MD |
522 | reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0); |
523 | break; | |
524 | case REG_S64: | |
da6eed25 MD |
525 | switch (reg[REG_R1].type) { |
526 | default: | |
b1caea50 | 527 | ERR("unknown register type\n"); |
da6eed25 MD |
528 | ret = -EINVAL; |
529 | goto end; | |
530 | ||
531 | case REG_S64: | |
532 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v); | |
533 | break; | |
534 | case REG_DOUBLE: | |
535 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].d); | |
536 | break; | |
537 | } | |
538 | break; | |
539 | case REG_DOUBLE: | |
540 | switch (reg[REG_R1].type) { | |
541 | default: | |
b1caea50 | 542 | ERR("unknown register type\n"); |
da6eed25 MD |
543 | ret = -EINVAL; |
544 | goto end; | |
545 | ||
546 | case REG_S64: | |
547 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].v); | |
548 | break; | |
549 | case REG_DOUBLE: | |
550 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].d); | |
551 | break; | |
552 | } | |
cd54f6d9 MD |
553 | break; |
554 | } | |
555 | reg[REG_R0].type = REG_S64; | |
556 | next_pc += sizeof(struct binary_op); | |
557 | break; | |
558 | } | |
559 | ||
560 | /* unary */ | |
561 | case FILTER_OP_UNARY_PLUS: | |
562 | { | |
cd54f6d9 MD |
563 | next_pc += sizeof(struct unary_op); |
564 | break; | |
565 | } | |
566 | case FILTER_OP_UNARY_MINUS: | |
567 | { | |
568 | struct unary_op *insn = (struct unary_op *) pc; | |
569 | ||
da6eed25 MD |
570 | switch (reg[insn->reg].type) { |
571 | default: | |
b1caea50 | 572 | ERR("unknown register type\n"); |
cd54f6d9 MD |
573 | ret = -EINVAL; |
574 | goto end; | |
da6eed25 MD |
575 | |
576 | case REG_STRING: | |
b1caea50 | 577 | ERR("Unary minus can only be applied to numeric or floating point registers\n"); |
da6eed25 MD |
578 | ret = -EINVAL; |
579 | goto end; | |
580 | case REG_S64: | |
581 | reg[insn->reg].v = -reg[insn->reg].v; | |
582 | break; | |
583 | case REG_DOUBLE: | |
584 | reg[insn->reg].d = -reg[insn->reg].d; | |
585 | break; | |
cd54f6d9 | 586 | } |
cd54f6d9 MD |
587 | next_pc += sizeof(struct unary_op); |
588 | break; | |
589 | } | |
590 | case FILTER_OP_UNARY_NOT: | |
591 | { | |
592 | struct unary_op *insn = (struct unary_op *) pc; | |
593 | ||
da6eed25 MD |
594 | switch (reg[insn->reg].type) { |
595 | default: | |
b1caea50 | 596 | ERR("unknown register type\n"); |
da6eed25 MD |
597 | ret = -EINVAL; |
598 | goto end; | |
599 | ||
600 | case REG_STRING: | |
b1caea50 | 601 | ERR("Unary not can only be applied to numeric or floating point registers\n"); |
da6eed25 MD |
602 | ret = -EINVAL; |
603 | goto end; | |
604 | case REG_S64: | |
605 | reg[insn->reg].v = !reg[insn->reg].v; | |
606 | break; | |
607 | case REG_DOUBLE: | |
608 | reg[insn->reg].d = !reg[insn->reg].d; | |
609 | break; | |
610 | } | |
cd54f6d9 MD |
611 | reg[insn->reg].v = !reg[insn->reg].v; |
612 | next_pc += sizeof(struct unary_op); | |
613 | break; | |
614 | } | |
615 | /* logical */ | |
616 | case FILTER_OP_AND: | |
617 | { | |
618 | struct logical_op *insn = (struct logical_op *) pc; | |
619 | ||
cd54f6d9 | 620 | /* If REG_R0 is 0, skip and evaluate to 0 */ |
da6eed25 MD |
621 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v == 0) |
622 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d == 0.0)) { | |
cd54f6d9 MD |
623 | dbg_printf("Jumping to bytecode offset %u\n", |
624 | (unsigned int) insn->skip_offset); | |
625 | next_pc = start_pc + insn->skip_offset; | |
cd54f6d9 MD |
626 | } else { |
627 | next_pc += sizeof(struct logical_op); | |
628 | } | |
629 | break; | |
630 | } | |
631 | case FILTER_OP_OR: | |
632 | { | |
633 | struct logical_op *insn = (struct logical_op *) pc; | |
634 | ||
cd54f6d9 | 635 | /* If REG_R0 is nonzero, skip and evaluate to 1 */ |
da6eed25 MD |
636 | |
637 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v != 0) | |
638 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d != 0.0)) { | |
cd54f6d9 MD |
639 | reg[REG_R0].v = 1; |
640 | dbg_printf("Jumping to bytecode offset %u\n", | |
641 | (unsigned int) insn->skip_offset); | |
642 | next_pc = start_pc + insn->skip_offset; | |
cd54f6d9 MD |
643 | } else { |
644 | next_pc += sizeof(struct logical_op); | |
645 | } | |
646 | break; | |
647 | } | |
648 | ||
649 | /* load */ | |
650 | case FILTER_OP_LOAD_FIELD_REF: | |
651 | { | |
652 | struct load_op *insn = (struct load_op *) pc; | |
653 | struct field_ref *ref = (struct field_ref *) insn->data; | |
654 | ||
cd54f6d9 MD |
655 | dbg_printf("load field ref offset %u type %u\n", |
656 | ref->offset, ref->type); | |
657 | switch (ref->type) { | |
658 | case FIELD_REF_UNKNOWN: | |
659 | default: | |
b1caea50 | 660 | ERR("unknown field ref type\n"); |
cd54f6d9 MD |
661 | ret = -EINVAL; |
662 | goto end; | |
663 | ||
664 | case FIELD_REF_STRING: | |
665 | reg[insn->reg].str = | |
666 | *(const char * const *) &filter_stack_data[ref->offset]; | |
667 | reg[insn->reg].type = REG_STRING; | |
668 | reg[insn->reg].seq_len = UINT_MAX; | |
669 | reg[insn->reg].literal = 0; | |
670 | dbg_printf("ref load string %s\n", reg[insn->reg].str); | |
671 | break; | |
672 | case FIELD_REF_SEQUENCE: | |
673 | reg[insn->reg].seq_len = | |
674 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
675 | reg[insn->reg].str = | |
676 | *(const char **) (&filter_stack_data[ref->offset | |
677 | + sizeof(unsigned long)]); | |
da6eed25 | 678 | reg[insn->reg].type = REG_STRING; |
cd54f6d9 MD |
679 | reg[insn->reg].literal = 0; |
680 | break; | |
681 | case FIELD_REF_S64: | |
682 | memcpy(®[insn->reg].v, &filter_stack_data[ref->offset], | |
683 | sizeof(struct literal_numeric)); | |
684 | reg[insn->reg].type = REG_S64; | |
685 | reg[insn->reg].literal = 0; | |
686 | dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v); | |
687 | break; | |
da6eed25 MD |
688 | case FIELD_REF_DOUBLE: |
689 | memcpy(®[insn->reg].d, &filter_stack_data[ref->offset], | |
690 | sizeof(struct literal_double)); | |
691 | reg[insn->reg].type = REG_DOUBLE; | |
692 | reg[insn->reg].literal = 0; | |
693 | dbg_printf("ref load double %g\n", reg[insn->reg].d); | |
694 | break; | |
cd54f6d9 MD |
695 | } |
696 | ||
697 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
698 | break; | |
699 | } | |
700 | ||
701 | case FILTER_OP_LOAD_STRING: | |
702 | { | |
703 | struct load_op *insn = (struct load_op *) pc; | |
704 | ||
cd54f6d9 MD |
705 | dbg_printf("load string %s\n", insn->data); |
706 | reg[insn->reg].str = insn->data; | |
707 | reg[insn->reg].type = REG_STRING; | |
708 | reg[insn->reg].seq_len = UINT_MAX; | |
709 | reg[insn->reg].literal = 1; | |
710 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
711 | break; | |
712 | } | |
713 | ||
714 | case FILTER_OP_LOAD_S64: | |
715 | { | |
716 | struct load_op *insn = (struct load_op *) pc; | |
717 | ||
cd54f6d9 MD |
718 | memcpy(®[insn->reg].v, insn->data, |
719 | sizeof(struct literal_numeric)); | |
720 | dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v); | |
721 | reg[insn->reg].type = REG_S64; | |
722 | next_pc += sizeof(struct load_op) | |
723 | + sizeof(struct literal_numeric); | |
724 | break; | |
725 | } | |
da6eed25 MD |
726 | |
727 | case FILTER_OP_LOAD_DOUBLE: | |
728 | { | |
729 | struct load_op *insn = (struct load_op *) pc; | |
730 | ||
da6eed25 MD |
731 | memcpy(®[insn->reg].d, insn->data, |
732 | sizeof(struct literal_double)); | |
733 | dbg_printf("load s64 %g\n", reg[insn->reg].d); | |
734 | reg[insn->reg].type = REG_DOUBLE; | |
735 | next_pc += sizeof(struct load_op) | |
736 | + sizeof(struct literal_double); | |
737 | break; | |
738 | } | |
cd54f6d9 MD |
739 | } |
740 | } | |
741 | end: | |
742 | /* return 0 (discard) on error */ | |
743 | if (ret) | |
744 | return 0; | |
745 | return retval; | |
746 | } | |
747 | ||
9522a886 MD |
748 | static |
749 | int bin_op_compare_check(struct vreg reg[NR_REG], const char *str) | |
750 | { | |
751 | switch (reg[REG_R0].type) { | |
752 | default: | |
753 | goto error_unknown; | |
754 | ||
755 | case REG_STRING: | |
756 | switch (reg[REG_R1].type) { | |
757 | default: | |
758 | goto error_unknown; | |
759 | ||
760 | case REG_STRING: | |
761 | break; | |
762 | case REG_S64: | |
763 | case REG_DOUBLE: | |
764 | goto error_mismatch; | |
765 | } | |
766 | break; | |
767 | case REG_S64: | |
768 | case REG_DOUBLE: | |
769 | switch (reg[REG_R1].type) { | |
770 | default: | |
771 | goto error_unknown; | |
772 | ||
773 | case REG_STRING: | |
774 | goto error_mismatch; | |
775 | ||
776 | case REG_S64: | |
777 | case REG_DOUBLE: | |
778 | break; | |
779 | } | |
780 | break; | |
781 | } | |
782 | return 0; | |
783 | ||
784 | error_unknown: | |
785 | ||
786 | return -EINVAL; | |
787 | error_mismatch: | |
788 | ERR("type mismatch for '%s' binary operator\n", str); | |
789 | return -EINVAL; | |
790 | } | |
791 | ||
792 | static | |
793 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
794 | { | |
795 | void *pc, *next_pc, *start_pc; | |
796 | int ret = -EINVAL; | |
797 | struct vreg reg[NR_REG]; | |
798 | int i; | |
799 | ||
800 | for (i = 0; i < NR_REG; i++) { | |
801 | reg[i].type = REG_S64; | |
802 | reg[i].literal = 0; | |
803 | } | |
804 | ||
805 | start_pc = &bytecode->data[0]; | |
806 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
807 | pc = next_pc) { | |
808 | if (unlikely(pc >= start_pc + bytecode->len)) { | |
809 | ERR("filter bytecode overflow\n"); | |
810 | ret = -EINVAL; | |
811 | goto end; | |
812 | } | |
813 | dbg_printf("Validating op %s (%u)\n", | |
814 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
815 | (unsigned int) *(filter_opcode_t *) pc); | |
816 | switch (*(filter_opcode_t *) pc) { | |
817 | case FILTER_OP_UNKNOWN: | |
818 | default: | |
819 | ERR("unknown bytecode op %u\n", | |
820 | (unsigned int) *(filter_opcode_t *) pc); | |
821 | ret = -EINVAL; | |
822 | goto end; | |
823 | ||
824 | case FILTER_OP_RETURN: | |
825 | ret = 0; | |
826 | goto end; | |
827 | ||
828 | /* binary */ | |
829 | case FILTER_OP_MUL: | |
830 | case FILTER_OP_DIV: | |
831 | case FILTER_OP_MOD: | |
832 | case FILTER_OP_PLUS: | |
833 | case FILTER_OP_MINUS: | |
834 | case FILTER_OP_RSHIFT: | |
835 | case FILTER_OP_LSHIFT: | |
836 | case FILTER_OP_BIN_AND: | |
837 | case FILTER_OP_BIN_OR: | |
838 | case FILTER_OP_BIN_XOR: | |
839 | ERR("unsupported bytecode op %u\n", | |
840 | (unsigned int) *(filter_opcode_t *) pc); | |
841 | ret = -EINVAL; | |
842 | goto end; | |
843 | ||
844 | case FILTER_OP_EQ: | |
845 | { | |
846 | ret = bin_op_compare_check(reg, "=="); | |
847 | if (ret) | |
848 | goto end; | |
849 | reg[REG_R0].type = REG_S64; | |
850 | next_pc += sizeof(struct binary_op); | |
851 | break; | |
852 | } | |
853 | case FILTER_OP_NE: | |
854 | { | |
855 | ret = bin_op_compare_check(reg, "!="); | |
856 | if (ret) | |
857 | goto end; | |
858 | reg[REG_R0].type = REG_S64; | |
859 | next_pc += sizeof(struct binary_op); | |
860 | break; | |
861 | } | |
862 | case FILTER_OP_GT: | |
863 | { | |
864 | ret = bin_op_compare_check(reg, ">"); | |
865 | if (ret) | |
866 | goto end; | |
867 | reg[REG_R0].type = REG_S64; | |
868 | next_pc += sizeof(struct binary_op); | |
869 | break; | |
870 | } | |
871 | case FILTER_OP_LT: | |
872 | { | |
873 | ret = bin_op_compare_check(reg, "<"); | |
874 | if (ret) | |
875 | goto end; | |
876 | reg[REG_R0].type = REG_S64; | |
877 | next_pc += sizeof(struct binary_op); | |
878 | break; | |
879 | } | |
880 | case FILTER_OP_GE: | |
881 | { | |
882 | ret = bin_op_compare_check(reg, ">="); | |
883 | if (ret) | |
884 | goto end; | |
885 | reg[REG_R0].type = REG_S64; | |
886 | next_pc += sizeof(struct binary_op); | |
887 | break; | |
888 | } | |
889 | case FILTER_OP_LE: | |
890 | { | |
891 | ret = bin_op_compare_check(reg, "<="); | |
892 | if (ret) | |
893 | goto end; | |
894 | reg[REG_R0].type = REG_S64; | |
895 | next_pc += sizeof(struct binary_op); | |
896 | break; | |
897 | } | |
898 | ||
899 | /* unary */ | |
900 | case FILTER_OP_UNARY_PLUS: | |
901 | case FILTER_OP_UNARY_MINUS: | |
902 | case FILTER_OP_UNARY_NOT: | |
903 | { | |
904 | struct unary_op *insn = (struct unary_op *) pc; | |
905 | ||
906 | if (unlikely(insn->reg >= REG_ERROR)) { | |
907 | ERR("invalid register %u\n", | |
908 | (unsigned int) insn->reg); | |
909 | ret = -EINVAL; | |
910 | goto end; | |
911 | } | |
912 | switch (reg[insn->reg].type) { | |
913 | default: | |
914 | ERR("unknown register type\n"); | |
915 | ret = -EINVAL; | |
916 | goto end; | |
917 | ||
918 | case REG_STRING: | |
919 | ERR("Unary op can only be applied to numeric or floating point registers\n"); | |
920 | ret = -EINVAL; | |
921 | goto end; | |
922 | case REG_S64: | |
923 | break; | |
924 | case REG_DOUBLE: | |
925 | break; | |
926 | } | |
927 | next_pc += sizeof(struct unary_op); | |
928 | break; | |
929 | } | |
930 | /* logical */ | |
931 | case FILTER_OP_AND: | |
932 | case FILTER_OP_OR: | |
933 | { | |
934 | struct logical_op *insn = (struct logical_op *) pc; | |
935 | ||
936 | if (unlikely(reg[REG_R0].type == REG_STRING)) { | |
937 | ERR("Logical operator 'and' can only be applied to numeric and floating point registers\n"); | |
938 | ret = -EINVAL; | |
939 | goto end; | |
940 | } | |
941 | ||
942 | dbg_printf("Validate jumping to bytecode offset %u\n", | |
943 | (unsigned int) insn->skip_offset); | |
944 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
945 | ERR("Loops are not allowed in bytecode\n"); | |
946 | ret = -EINVAL; | |
947 | goto end; | |
948 | } | |
949 | next_pc += sizeof(struct logical_op); | |
950 | break; | |
951 | } | |
952 | ||
953 | /* load */ | |
954 | case FILTER_OP_LOAD_FIELD_REF: | |
955 | { | |
956 | struct load_op *insn = (struct load_op *) pc; | |
957 | struct field_ref *ref = (struct field_ref *) insn->data; | |
958 | ||
959 | if (unlikely(insn->reg >= REG_ERROR)) { | |
960 | ERR("invalid register %u\n", | |
961 | (unsigned int) insn->reg); | |
962 | ret = -EINVAL; | |
963 | goto end; | |
964 | } | |
965 | dbg_printf("Validate load field ref offset %u type %u\n", | |
966 | ref->offset, ref->type); | |
967 | switch (ref->type) { | |
968 | case FIELD_REF_UNKNOWN: | |
969 | default: | |
970 | ERR("unknown field ref type\n"); | |
971 | ret = -EINVAL; | |
972 | goto end; | |
973 | ||
974 | case FIELD_REF_STRING: | |
975 | reg[insn->reg].type = REG_STRING; | |
976 | reg[insn->reg].literal = 0; | |
977 | break; | |
978 | case FIELD_REF_SEQUENCE: | |
979 | reg[insn->reg].type = REG_STRING; | |
980 | reg[insn->reg].literal = 0; | |
981 | break; | |
982 | case FIELD_REF_S64: | |
983 | reg[insn->reg].type = REG_S64; | |
984 | reg[insn->reg].literal = 0; | |
985 | break; | |
986 | case FIELD_REF_DOUBLE: | |
987 | reg[insn->reg].type = REG_DOUBLE; | |
988 | reg[insn->reg].literal = 0; | |
989 | break; | |
990 | } | |
991 | ||
992 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
993 | break; | |
994 | } | |
995 | ||
996 | case FILTER_OP_LOAD_STRING: | |
997 | { | |
998 | struct load_op *insn = (struct load_op *) pc; | |
999 | ||
1000 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1001 | ERR("invalid register %u\n", | |
1002 | (unsigned int) insn->reg); | |
1003 | ret = -EINVAL; | |
1004 | goto end; | |
1005 | } | |
1006 | reg[insn->reg].type = REG_STRING; | |
1007 | reg[insn->reg].literal = 1; | |
1008 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
1009 | break; | |
1010 | } | |
1011 | ||
1012 | case FILTER_OP_LOAD_S64: | |
1013 | { | |
1014 | struct load_op *insn = (struct load_op *) pc; | |
1015 | ||
1016 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1017 | ERR("invalid register %u\n", | |
1018 | (unsigned int) insn->reg); | |
1019 | ret = -EINVAL; | |
1020 | goto end; | |
1021 | } | |
1022 | reg[insn->reg].type = REG_S64; | |
1023 | next_pc += sizeof(struct load_op) | |
1024 | + sizeof(struct literal_numeric); | |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | case FILTER_OP_LOAD_DOUBLE: | |
1029 | { | |
1030 | struct load_op *insn = (struct load_op *) pc; | |
1031 | ||
1032 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1033 | ERR("invalid register %u\n", | |
1034 | (unsigned int) insn->reg); | |
1035 | ret = -EINVAL; | |
1036 | goto end; | |
1037 | } | |
1038 | reg[insn->reg].type = REG_DOUBLE; | |
1039 | next_pc += sizeof(struct load_op) | |
1040 | + sizeof(struct literal_double); | |
1041 | break; | |
1042 | } | |
1043 | } | |
1044 | } | |
1045 | end: | |
1046 | return ret; | |
1047 | } | |
1048 | ||
cd54f6d9 MD |
1049 | static |
1050 | int apply_field_reloc(struct ltt_event *event, | |
1051 | struct bytecode_runtime *runtime, | |
1052 | uint32_t runtime_len, | |
1053 | uint32_t reloc_offset, | |
1054 | const char *field_name) | |
1055 | { | |
1056 | const struct lttng_event_desc *desc; | |
1057 | const struct lttng_event_field *fields, *field = NULL; | |
1058 | unsigned int nr_fields, i; | |
1059 | struct field_ref *field_ref; | |
1060 | uint32_t field_offset = 0; | |
1061 | ||
a8c27c7c | 1062 | dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name); |
cd54f6d9 MD |
1063 | |
1064 | /* Ensure that the reloc is within the code */ | |
1065 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
1066 | return -EINVAL; | |
1067 | ||
1068 | /* Lookup event by name */ | |
1069 | desc = event->desc; | |
1070 | if (!desc) | |
1071 | return -EINVAL; | |
1072 | fields = desc->fields; | |
1073 | if (!fields) | |
1074 | return -EINVAL; | |
1075 | nr_fields = desc->nr_fields; | |
1076 | for (i = 0; i < nr_fields; i++) { | |
1077 | if (!strcmp(fields[i].name, field_name)) { | |
1078 | field = &fields[i]; | |
1079 | break; | |
1080 | } | |
1081 | /* compute field offset */ | |
1082 | switch (fields[i].type.atype) { | |
1083 | case atype_integer: | |
1084 | case atype_enum: | |
1085 | field_offset += sizeof(int64_t); | |
1086 | break; | |
1087 | case atype_array: | |
1088 | case atype_sequence: | |
1089 | field_offset += sizeof(unsigned long); | |
1090 | field_offset += sizeof(void *); | |
1091 | break; | |
1092 | case atype_string: | |
1093 | field_offset += sizeof(void *); | |
1094 | break; | |
1095 | case atype_float: | |
1096 | field_offset += sizeof(double); | |
da6eed25 | 1097 | break; |
cd54f6d9 MD |
1098 | default: |
1099 | return -EINVAL; | |
1100 | } | |
1101 | } | |
1102 | if (!field) | |
1103 | return -EINVAL; | |
1104 | ||
1105 | /* Check if field offset is too large for 16-bit offset */ | |
1106 | if (field_offset > FILTER_BYTECODE_MAX_LEN) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | /* set type */ | |
1110 | field_ref = (struct field_ref *) &runtime->data[reloc_offset]; | |
1111 | switch (field->type.atype) { | |
1112 | case atype_integer: | |
1113 | case atype_enum: | |
1114 | field_ref->type = FIELD_REF_S64; | |
1115 | field_ref->type = FIELD_REF_S64; | |
1116 | break; | |
1117 | case atype_array: | |
1118 | case atype_sequence: | |
1119 | field_ref->type = FIELD_REF_SEQUENCE; | |
1120 | break; | |
1121 | case atype_string: | |
1122 | field_ref->type = FIELD_REF_STRING; | |
1123 | break; | |
1124 | case atype_float: | |
da6eed25 MD |
1125 | field_ref->type = FIELD_REF_DOUBLE; |
1126 | break; | |
cd54f6d9 MD |
1127 | default: |
1128 | return -EINVAL; | |
1129 | } | |
1130 | /* set offset */ | |
1131 | field_ref->offset = (uint16_t) field_offset; | |
2d78951a MD |
1132 | return 0; |
1133 | } | |
1134 | ||
cd54f6d9 MD |
1135 | /* |
1136 | * Take a bytecode with reloc table and link it to an event to create a | |
1137 | * bytecode runtime. | |
1138 | */ | |
2d78951a MD |
1139 | static |
1140 | int _lttng_filter_event_link_bytecode(struct ltt_event *event, | |
1141 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1142 | { | |
cd54f6d9 MD |
1143 | int ret, offset, next_offset; |
1144 | struct bytecode_runtime *runtime = NULL; | |
1145 | size_t runtime_alloc_len; | |
1146 | ||
2d78951a MD |
1147 | if (!filter_bytecode) |
1148 | return 0; | |
cd54f6d9 MD |
1149 | /* Even is not connected to any description */ |
1150 | if (!event->desc) | |
1151 | return 0; | |
1152 | /* Bytecode already linked */ | |
1153 | if (event->filter || event->filter_data) | |
1154 | return 0; | |
2d78951a | 1155 | |
a8c27c7c | 1156 | dbg_printf("Linking\n"); |
cd54f6d9 MD |
1157 | |
1158 | /* We don't need the reloc table in the runtime */ | |
1159 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset; | |
1160 | runtime = zmalloc(runtime_alloc_len); | |
1161 | if (!runtime) { | |
1162 | ret = -ENOMEM; | |
1163 | goto link_error; | |
1164 | } | |
1165 | runtime->len = filter_bytecode->reloc_offset; | |
1166 | /* copy original bytecode */ | |
1167 | memcpy(runtime->data, filter_bytecode->data, runtime->len); | |
1168 | /* | |
1169 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
1170 | * followed by a string (field name). | |
1171 | */ | |
cd54f6d9 MD |
1172 | for (offset = filter_bytecode->reloc_offset; |
1173 | offset < filter_bytecode->len; | |
1174 | offset = next_offset) { | |
1175 | uint16_t reloc_offset = | |
1176 | *(uint16_t *) &filter_bytecode->data[offset]; | |
1177 | const char *field_name = | |
1178 | (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)]; | |
1179 | ||
1180 | ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name); | |
1181 | if (ret) { | |
1182 | goto link_error; | |
1183 | } | |
1184 | next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1; | |
1185 | } | |
9522a886 MD |
1186 | /* Validate bytecode */ |
1187 | ret = lttng_filter_validate_bytecode(runtime); | |
1188 | if (ret) { | |
1189 | goto link_error; | |
1190 | } | |
cd54f6d9 | 1191 | event->filter_data = runtime; |
2d78951a | 1192 | event->filter = lttng_filter_interpret_bytecode; |
2d78951a | 1193 | return 0; |
cd54f6d9 MD |
1194 | |
1195 | link_error: | |
1196 | event->filter = lttng_filter_false; | |
1197 | free(runtime); | |
1198 | return ret; | |
2d78951a MD |
1199 | } |
1200 | ||
1201 | void lttng_filter_event_link_bytecode(struct ltt_event *event, | |
1202 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1203 | { | |
1204 | int ret; | |
1205 | ||
cd54f6d9 | 1206 | ret = _lttng_filter_event_link_bytecode(event, filter_bytecode); |
2d78951a MD |
1207 | if (ret) { |
1208 | fprintf(stderr, "[lttng filter] error linking event bytecode\n"); | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Link bytecode to all events for a wildcard. Skips events that already | |
1214 | * have a bytecode linked. | |
1215 | * We do not set each event's filter_bytecode field, because they do not | |
1216 | * own the filter_bytecode: the wildcard owns it. | |
1217 | */ | |
1218 | void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard) | |
1219 | { | |
1220 | struct ltt_event *event; | |
1221 | int ret; | |
1222 | ||
1223 | if (!wildcard->filter_bytecode) | |
1224 | return; | |
1225 | ||
1226 | cds_list_for_each_entry(event, &wildcard->events, wildcard_list) { | |
1227 | if (event->filter) | |
1228 | continue; | |
1229 | ret = _lttng_filter_event_link_bytecode(event, | |
1230 | wildcard->filter_bytecode); | |
1231 | if (ret) { | |
1232 | fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n"); | |
1233 | } | |
1234 | ||
1235 | } | |
1236 | return; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Need to attach filter to an event before starting tracing for the | |
cd54f6d9 | 1241 | * session. We own the filter_bytecode if we return success. |
2d78951a MD |
1242 | */ |
1243 | int lttng_filter_event_attach_bytecode(struct ltt_event *event, | |
1244 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1245 | { | |
2d78951a MD |
1246 | if (event->chan->session->been_active) |
1247 | return -EPERM; | |
1248 | if (event->filter_bytecode) | |
1249 | return -EEXIST; | |
cd54f6d9 | 1250 | event->filter_bytecode = filter_bytecode; |
2d78951a MD |
1251 | return 0; |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Need to attach filter to a wildcard before starting tracing for the | |
cd54f6d9 | 1256 | * session. We own the filter_bytecode if we return success. |
2d78951a MD |
1257 | */ |
1258 | int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard, | |
1259 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1260 | { | |
2d78951a MD |
1261 | if (wildcard->chan->session->been_active) |
1262 | return -EPERM; | |
1263 | if (wildcard->filter_bytecode) | |
1264 | return -EEXIST; | |
cd54f6d9 | 1265 | wildcard->filter_bytecode = filter_bytecode; |
2d78951a MD |
1266 | return 0; |
1267 | } |