Commit | Line | Data |
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953192ba MD |
1 | /* |
2 | * filter-visitor-generate-bytecode.c | |
3 | * | |
4 | * LTTng filter bytecode generation | |
5 | * | |
6 | * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <errno.h> | |
46820c8b | 25 | #include <common/align.h> |
afc5df03 | 26 | #include <common/compat/string.h> |
46820c8b | 27 | |
953192ba MD |
28 | #include "filter-bytecode.h" |
29 | #include "filter-ir.h" | |
30 | #include "filter-ast.h" | |
31 | ||
a187da1a DG |
32 | #include <common/macros.h> |
33 | ||
953192ba MD |
34 | #ifndef max_t |
35 | #define max_t(type, a, b) ((type) ((a) > (b) ? (a) : (b))) | |
36 | #endif | |
37 | ||
953192ba MD |
38 | #define INIT_ALLOC_SIZE 4 |
39 | ||
40 | static | |
41 | int recursive_visit_gen_bytecode(struct filter_parser_ctx *ctx, | |
42 | struct ir_op *node); | |
43 | ||
01a204f0 CB |
44 | static inline int get_count_order(unsigned int count) |
45 | { | |
46 | int order; | |
47 | ||
afc5df03 | 48 | order = lttng_fls(count) - 1; |
01a204f0 CB |
49 | if (count & (count - 1)) |
50 | order++; | |
51 | return order; | |
52 | } | |
53 | ||
953192ba | 54 | static |
53a80697 | 55 | int bytecode_init(struct lttng_filter_bytecode_alloc **fb) |
953192ba | 56 | { |
1029587a MD |
57 | uint32_t alloc_len; |
58 | ||
59 | alloc_len = sizeof(struct lttng_filter_bytecode_alloc) + INIT_ALLOC_SIZE; | |
60 | *fb = calloc(alloc_len, 1); | |
953192ba MD |
61 | if (!*fb) { |
62 | return -ENOMEM; | |
63 | } else { | |
1029587a | 64 | (*fb)->alloc_len = alloc_len; |
953192ba MD |
65 | return 0; |
66 | } | |
67 | } | |
68 | ||
69 | static | |
53a80697 | 70 | int32_t bytecode_reserve(struct lttng_filter_bytecode_alloc **fb, uint32_t align, uint32_t len) |
953192ba MD |
71 | { |
72 | int32_t ret; | |
73 | uint32_t padding = offset_align((*fb)->b.len, align); | |
ec96a8f6 | 74 | uint32_t new_len = (*fb)->b.len + padding + len; |
1029587a | 75 | uint32_t new_alloc_len = sizeof(struct lttng_filter_bytecode_alloc) + new_len; |
ec96a8f6 | 76 | uint32_t old_alloc_len = (*fb)->alloc_len; |
953192ba | 77 | |
ec96a8f6 | 78 | if (new_len > LTTNG_FILTER_MAX_LEN) |
5ddb0a08 CB |
79 | return -EINVAL; |
80 | ||
ec96a8f6 | 81 | if (new_alloc_len > old_alloc_len) { |
d0b96690 DG |
82 | struct lttng_filter_bytecode_alloc *newptr; |
83 | ||
ec96a8f6 MD |
84 | new_alloc_len = |
85 | max_t(uint32_t, 1U << get_count_order(new_alloc_len), old_alloc_len << 1); | |
d0b96690 DG |
86 | newptr = realloc(*fb, new_alloc_len); |
87 | if (!newptr) | |
953192ba | 88 | return -ENOMEM; |
d0b96690 | 89 | *fb = newptr; |
1029587a | 90 | /* We zero directly the memory from start of allocation. */ |
ec96a8f6 MD |
91 | memset(&((char *) *fb)[old_alloc_len], 0, new_alloc_len - old_alloc_len); |
92 | (*fb)->alloc_len = new_alloc_len; | |
953192ba MD |
93 | } |
94 | (*fb)->b.len += padding; | |
95 | ret = (*fb)->b.len; | |
96 | (*fb)->b.len += len; | |
97 | return ret; | |
98 | } | |
99 | ||
100 | static | |
53a80697 | 101 | int bytecode_push(struct lttng_filter_bytecode_alloc **fb, const void *data, |
953192ba MD |
102 | uint32_t align, uint32_t len) |
103 | { | |
104 | int32_t offset; | |
105 | ||
106 | offset = bytecode_reserve(fb, align, len); | |
107 | if (offset < 0) | |
108 | return offset; | |
109 | memcpy(&(*fb)->b.data[offset], data, len); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static | |
53a80697 | 114 | int bytecode_push_logical(struct lttng_filter_bytecode_alloc **fb, |
953192ba MD |
115 | struct logical_op *data, |
116 | uint32_t align, uint32_t len, | |
117 | uint16_t *skip_offset) | |
118 | { | |
119 | int32_t offset; | |
120 | ||
121 | offset = bytecode_reserve(fb, align, len); | |
122 | if (offset < 0) | |
123 | return offset; | |
124 | memcpy(&(*fb)->b.data[offset], data, len); | |
125 | *skip_offset = | |
126 | (void *) &((struct logical_op *) &(*fb)->b.data[offset])->skip_offset | |
127 | - (void *) &(*fb)->b.data[0]; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static | |
53a80697 | 132 | int bytecode_patch(struct lttng_filter_bytecode_alloc **fb, |
953192ba MD |
133 | const void *data, |
134 | uint16_t offset, | |
135 | uint32_t len) | |
136 | { | |
137 | if (offset >= (*fb)->b.len) { | |
138 | return -EINVAL; | |
139 | } | |
140 | memcpy(&(*fb)->b.data[offset], data, len); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static | |
145 | int visit_node_root(struct filter_parser_ctx *ctx, struct ir_op *node) | |
146 | { | |
147 | int ret; | |
148 | struct return_op insn; | |
149 | ||
150 | /* Visit child */ | |
151 | ret = recursive_visit_gen_bytecode(ctx, node->u.root.child); | |
152 | if (ret) | |
153 | return ret; | |
154 | ||
155 | /* Generate end of bytecode instruction */ | |
156 | insn.op = FILTER_OP_RETURN; | |
157 | return bytecode_push(&ctx->bytecode, &insn, 1, sizeof(insn)); | |
158 | } | |
159 | ||
953192ba MD |
160 | static |
161 | int visit_node_load(struct filter_parser_ctx *ctx, struct ir_op *node) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | switch (node->data_type) { | |
166 | case IR_DATA_UNKNOWN: | |
167 | default: | |
168 | fprintf(stderr, "[error] Unknown data type in %s\n", | |
169 | __func__); | |
170 | return -EINVAL; | |
171 | ||
172 | case IR_DATA_STRING: | |
173 | { | |
174 | struct load_op *insn; | |
175 | uint32_t insn_len = sizeof(struct load_op) | |
9f449915 | 176 | + strlen(node->u.load.u.string.value) + 1; |
953192ba MD |
177 | |
178 | insn = calloc(insn_len, 1); | |
179 | if (!insn) | |
180 | return -ENOMEM; | |
9f449915 PP |
181 | |
182 | switch (node->u.load.u.string.type) { | |
183 | case IR_LOAD_STRING_TYPE_GLOB_STAR: | |
184 | /* | |
185 | * We explicitly tell the interpreter here that | |
186 | * this load is a full star globbing pattern so | |
187 | * that the appropriate matching function can be | |
188 | * called. Also, see comment below. | |
189 | */ | |
190 | insn->op = FILTER_OP_LOAD_STAR_GLOB_STRING; | |
191 | break; | |
192 | default: | |
193 | /* | |
194 | * This is the "legacy" string, which includes | |
195 | * star globbing patterns with a star only at | |
196 | * the end. Both "plain" and "star at the end" | |
197 | * literal strings are handled at the same place | |
198 | * by the tracer's filter bytecode interpreter, | |
199 | * whereas full star globbing patterns (stars | |
200 | * can be anywhere in the string) is a special | |
201 | * case. | |
202 | */ | |
203 | insn->op = FILTER_OP_LOAD_STRING; | |
204 | break; | |
205 | } | |
206 | ||
207 | strcpy(insn->data, node->u.load.u.string.value); | |
953192ba MD |
208 | ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len); |
209 | free(insn); | |
210 | return ret; | |
211 | } | |
212 | case IR_DATA_NUMERIC: | |
213 | { | |
214 | struct load_op *insn; | |
215 | uint32_t insn_len = sizeof(struct load_op) | |
216 | + sizeof(struct literal_numeric); | |
217 | ||
218 | insn = calloc(insn_len, 1); | |
219 | if (!insn) | |
220 | return -ENOMEM; | |
221 | insn->op = FILTER_OP_LOAD_S64; | |
58d494e4 | 222 | memcpy(insn->data, &node->u.load.u.num, sizeof(int64_t)); |
953192ba MD |
223 | ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len); |
224 | free(insn); | |
225 | return ret; | |
226 | } | |
e90d8561 MD |
227 | case IR_DATA_FLOAT: |
228 | { | |
229 | struct load_op *insn; | |
230 | uint32_t insn_len = sizeof(struct load_op) | |
231 | + sizeof(struct literal_double); | |
232 | ||
233 | insn = calloc(insn_len, 1); | |
234 | if (!insn) | |
235 | return -ENOMEM; | |
236 | insn->op = FILTER_OP_LOAD_DOUBLE; | |
58d494e4 | 237 | memcpy(insn->data, &node->u.load.u.flt, sizeof(double)); |
e90d8561 MD |
238 | ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len); |
239 | free(insn); | |
240 | return ret; | |
241 | } | |
586dc72f MD |
242 | case IR_DATA_FIELD_REF: /* fall-through */ |
243 | case IR_DATA_GET_CONTEXT_REF: | |
953192ba MD |
244 | { |
245 | struct load_op *insn; | |
246 | uint32_t insn_len = sizeof(struct load_op) | |
247 | + sizeof(struct field_ref); | |
248 | struct field_ref ref_offset; | |
ec96a8f6 MD |
249 | uint32_t reloc_offset_u32; |
250 | uint16_t reloc_offset; | |
953192ba MD |
251 | |
252 | insn = calloc(insn_len, 1); | |
253 | if (!insn) | |
254 | return -ENOMEM; | |
661dfdd1 | 255 | switch (node->data_type) { |
586dc72f MD |
256 | case IR_DATA_FIELD_REF: |
257 | insn->op = FILTER_OP_LOAD_FIELD_REF; | |
258 | break; | |
259 | case IR_DATA_GET_CONTEXT_REF: | |
260 | insn->op = FILTER_OP_GET_CONTEXT_REF; | |
261 | break; | |
262 | default: | |
3a68137c | 263 | free(insn); |
586dc72f MD |
264 | return -EINVAL; |
265 | } | |
953192ba MD |
266 | ref_offset.offset = (uint16_t) -1U; |
267 | memcpy(insn->data, &ref_offset, sizeof(ref_offset)); | |
65775683 | 268 | /* reloc_offset points to struct load_op */ |
ec96a8f6 MD |
269 | reloc_offset_u32 = bytecode_get_len(&ctx->bytecode->b); |
270 | if (reloc_offset_u32 > LTTNG_FILTER_MAX_LEN - 1) { | |
271 | free(insn); | |
272 | return -EINVAL; | |
273 | } | |
274 | reloc_offset = (uint16_t) reloc_offset_u32; | |
953192ba MD |
275 | ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len); |
276 | if (ret) { | |
277 | free(insn); | |
278 | return ret; | |
279 | } | |
280 | /* append reloc */ | |
281 | ret = bytecode_push(&ctx->bytecode_reloc, &reloc_offset, | |
282 | 1, sizeof(reloc_offset)); | |
283 | if (ret) { | |
284 | free(insn); | |
285 | return ret; | |
286 | } | |
287 | ret = bytecode_push(&ctx->bytecode_reloc, node->u.load.u.ref, | |
288 | 1, strlen(node->u.load.u.ref) + 1); | |
289 | free(insn); | |
290 | return ret; | |
291 | } | |
661dfdd1 MD |
292 | case IR_DATA_FIELD_REF_INDEX: /* fall-through */ |
293 | case IR_DATA_GET_CONTEXT_REF_INDEX: | |
294 | { | |
295 | struct load_op *insn; | |
296 | uint32_t insn_len = sizeof(struct load_op) | |
297 | + sizeof(struct field_ref_index); | |
298 | struct field_ref_index ref_index_offset; | |
299 | uint32_t reloc_offset_u32; | |
300 | uint16_t reloc_offset; | |
301 | ||
302 | insn = calloc(insn_len, 1); | |
303 | if (!insn) | |
304 | return -ENOMEM; | |
305 | switch (node->data_type) { | |
306 | case IR_DATA_FIELD_REF_INDEX: | |
307 | insn->op = FILTER_OP_LOAD_FIELD_REF_INDEX; | |
308 | break; | |
309 | case IR_DATA_GET_CONTEXT_REF_INDEX: | |
310 | insn->op = FILTER_OP_GET_CONTEXT_REF_INDEX; | |
311 | break; | |
312 | default: | |
313 | free(insn); | |
314 | return -EINVAL; | |
315 | } | |
316 | ref_index_offset.offset = (uint16_t) -1U; | |
317 | ref_index_offset.index = node->u.load.u.ref_index.index; | |
318 | memcpy(insn->data, &ref_index_offset, sizeof(ref_index_offset)); | |
319 | /* reloc_offset points to struct load_op */ | |
320 | reloc_offset_u32 = bytecode_get_len(&ctx->bytecode->b); | |
321 | if (reloc_offset_u32 > LTTNG_FILTER_MAX_LEN - 1) { | |
322 | free(insn); | |
323 | return -EINVAL; | |
324 | } | |
325 | reloc_offset = (uint16_t) reloc_offset_u32; | |
326 | ret = bytecode_push(&ctx->bytecode, insn, 1, insn_len); | |
327 | if (ret) { | |
328 | free(insn); | |
329 | return ret; | |
330 | } | |
331 | /* append reloc */ | |
332 | ret = bytecode_push(&ctx->bytecode_reloc, &reloc_offset, | |
333 | 1, sizeof(reloc_offset)); | |
334 | if (ret) { | |
335 | free(insn); | |
336 | return ret; | |
337 | } | |
338 | ret = bytecode_push(&ctx->bytecode_reloc, node->u.load.u.ref_index.symbol, | |
339 | 1, strlen(node->u.load.u.ref_index.symbol) + 1); | |
340 | free(insn); | |
341 | return ret; | |
342 | } | |
953192ba MD |
343 | } |
344 | } | |
345 | ||
346 | static | |
347 | int visit_node_unary(struct filter_parser_ctx *ctx, struct ir_op *node) | |
348 | { | |
349 | int ret; | |
350 | struct unary_op insn; | |
351 | ||
352 | /* Visit child */ | |
353 | ret = recursive_visit_gen_bytecode(ctx, node->u.unary.child); | |
354 | if (ret) | |
355 | return ret; | |
356 | ||
357 | /* Generate end of bytecode instruction */ | |
358 | switch (node->u.unary.type) { | |
359 | case AST_UNARY_UNKNOWN: | |
360 | default: | |
361 | fprintf(stderr, "[error] Unknown unary node type in %s\n", | |
362 | __func__); | |
363 | return -EINVAL; | |
364 | case AST_UNARY_PLUS: | |
365 | /* Nothing to do. */ | |
366 | return 0; | |
367 | case AST_UNARY_MINUS: | |
368 | insn.op = FILTER_OP_UNARY_MINUS; | |
953192ba MD |
369 | return bytecode_push(&ctx->bytecode, &insn, 1, sizeof(insn)); |
370 | case AST_UNARY_NOT: | |
371 | insn.op = FILTER_OP_UNARY_NOT; | |
953192ba MD |
372 | return bytecode_push(&ctx->bytecode, &insn, 1, sizeof(insn)); |
373 | } | |
374 | } | |
375 | ||
376 | /* | |
377 | * Binary comparator nesting is disallowed. This allows fitting into | |
378 | * only 2 registers. | |
379 | */ | |
380 | static | |
381 | int visit_node_binary(struct filter_parser_ctx *ctx, struct ir_op *node) | |
382 | { | |
383 | int ret; | |
384 | struct binary_op insn; | |
385 | ||
386 | /* Visit child */ | |
387 | ret = recursive_visit_gen_bytecode(ctx, node->u.binary.left); | |
388 | if (ret) | |
389 | return ret; | |
390 | ret = recursive_visit_gen_bytecode(ctx, node->u.binary.right); | |
391 | if (ret) | |
392 | return ret; | |
393 | ||
394 | switch (node->u.binary.type) { | |
395 | case AST_OP_UNKNOWN: | |
396 | default: | |
397 | fprintf(stderr, "[error] Unknown unary node type in %s\n", | |
398 | __func__); | |
399 | return -EINVAL; | |
400 | ||
401 | case AST_OP_AND: | |
402 | case AST_OP_OR: | |
403 | fprintf(stderr, "[error] Unexpected logical node type in %s\n", | |
404 | __func__); | |
405 | return -EINVAL; | |
406 | ||
407 | case AST_OP_MUL: | |
408 | insn.op = FILTER_OP_MUL; | |
409 | break; | |
410 | case AST_OP_DIV: | |
411 | insn.op = FILTER_OP_DIV; | |
412 | break; | |
413 | case AST_OP_MOD: | |
414 | insn.op = FILTER_OP_MOD; | |
415 | break; | |
416 | case AST_OP_PLUS: | |
417 | insn.op = FILTER_OP_PLUS; | |
418 | break; | |
419 | case AST_OP_MINUS: | |
420 | insn.op = FILTER_OP_MINUS; | |
421 | break; | |
422 | case AST_OP_RSHIFT: | |
423 | insn.op = FILTER_OP_RSHIFT; | |
424 | break; | |
425 | case AST_OP_LSHIFT: | |
426 | insn.op = FILTER_OP_LSHIFT; | |
427 | break; | |
428 | case AST_OP_BIN_AND: | |
429 | insn.op = FILTER_OP_BIN_AND; | |
430 | break; | |
431 | case AST_OP_BIN_OR: | |
432 | insn.op = FILTER_OP_BIN_OR; | |
433 | break; | |
434 | case AST_OP_BIN_XOR: | |
435 | insn.op = FILTER_OP_BIN_XOR; | |
436 | break; | |
437 | ||
438 | case AST_OP_EQ: | |
439 | insn.op = FILTER_OP_EQ; | |
440 | break; | |
441 | case AST_OP_NE: | |
442 | insn.op = FILTER_OP_NE; | |
443 | break; | |
444 | case AST_OP_GT: | |
445 | insn.op = FILTER_OP_GT; | |
446 | break; | |
447 | case AST_OP_LT: | |
448 | insn.op = FILTER_OP_LT; | |
449 | break; | |
450 | case AST_OP_GE: | |
451 | insn.op = FILTER_OP_GE; | |
452 | break; | |
453 | case AST_OP_LE: | |
454 | insn.op = FILTER_OP_LE; | |
455 | break; | |
456 | } | |
457 | return bytecode_push(&ctx->bytecode, &insn, 1, sizeof(insn)); | |
458 | } | |
459 | ||
8cf9540a MD |
460 | /* |
461 | * A logical op always return a s64 (1 or 0). | |
462 | */ | |
953192ba MD |
463 | static |
464 | int visit_node_logical(struct filter_parser_ctx *ctx, struct ir_op *node) | |
465 | { | |
466 | int ret; | |
467 | struct logical_op insn; | |
468 | uint16_t skip_offset_loc; | |
469 | uint16_t target_loc; | |
470 | ||
471 | /* Visit left child */ | |
472 | ret = recursive_visit_gen_bytecode(ctx, node->u.binary.left); | |
473 | if (ret) | |
474 | return ret; | |
8cf9540a | 475 | /* Cast to s64 if float or field ref */ |
586dc72f | 476 | if ((node->u.binary.left->data_type == IR_DATA_FIELD_REF |
661dfdd1 MD |
477 | || node->u.binary.left->data_type == IR_DATA_GET_CONTEXT_REF |
478 | || node->u.binary.left->data_type == IR_DATA_FIELD_REF_INDEX | |
479 | || node->u.binary.left->data_type == IR_DATA_GET_CONTEXT_REF_INDEX) | |
8cf9540a MD |
480 | || node->u.binary.left->data_type == IR_DATA_FLOAT) { |
481 | struct cast_op cast_insn; | |
482 | ||
586dc72f | 483 | if (node->u.binary.left->data_type == IR_DATA_FIELD_REF |
661dfdd1 MD |
484 | || node->u.binary.left->data_type == IR_DATA_GET_CONTEXT_REF |
485 | || node->u.binary.left->data_type == IR_DATA_FIELD_REF_INDEX | |
486 | || node->u.binary.left->data_type == IR_DATA_GET_CONTEXT_REF_INDEX) { | |
29fefef8 MD |
487 | cast_insn.op = FILTER_OP_CAST_TO_S64; |
488 | } else { | |
489 | cast_insn.op = FILTER_OP_CAST_DOUBLE_TO_S64; | |
490 | } | |
8cf9540a MD |
491 | ret = bytecode_push(&ctx->bytecode, &cast_insn, |
492 | 1, sizeof(cast_insn)); | |
493 | if (ret) | |
494 | return ret; | |
495 | } | |
953192ba MD |
496 | switch (node->u.logical.type) { |
497 | default: | |
498 | fprintf(stderr, "[error] Unknown node type in %s\n", | |
499 | __func__); | |
500 | return -EINVAL; | |
501 | ||
502 | case AST_OP_AND: | |
503 | insn.op = FILTER_OP_AND; | |
504 | break; | |
505 | case AST_OP_OR: | |
506 | insn.op = FILTER_OP_OR; | |
507 | break; | |
508 | } | |
509 | insn.skip_offset = (uint16_t) -1UL; /* Temporary */ | |
510 | ret = bytecode_push_logical(&ctx->bytecode, &insn, 1, sizeof(insn), | |
511 | &skip_offset_loc); | |
512 | if (ret) | |
513 | return ret; | |
514 | /* Visit right child */ | |
515 | ret = recursive_visit_gen_bytecode(ctx, node->u.binary.right); | |
516 | if (ret) | |
517 | return ret; | |
8cf9540a | 518 | /* Cast to s64 if float or field ref */ |
586dc72f | 519 | if ((node->u.binary.right->data_type == IR_DATA_FIELD_REF |
661dfdd1 MD |
520 | || node->u.binary.right->data_type == IR_DATA_GET_CONTEXT_REF |
521 | || node->u.binary.right->data_type == IR_DATA_FIELD_REF_INDEX | |
522 | || node->u.binary.right->data_type == IR_DATA_GET_CONTEXT_REF_INDEX) | |
8cf9540a MD |
523 | || node->u.binary.right->data_type == IR_DATA_FLOAT) { |
524 | struct cast_op cast_insn; | |
525 | ||
586dc72f | 526 | if (node->u.binary.right->data_type == IR_DATA_FIELD_REF |
661dfdd1 MD |
527 | || node->u.binary.right->data_type == IR_DATA_GET_CONTEXT_REF |
528 | || node->u.binary.right->data_type == IR_DATA_FIELD_REF_INDEX | |
529 | || node->u.binary.right->data_type == IR_DATA_GET_CONTEXT_REF_INDEX) { | |
29fefef8 MD |
530 | cast_insn.op = FILTER_OP_CAST_TO_S64; |
531 | } else { | |
532 | cast_insn.op = FILTER_OP_CAST_DOUBLE_TO_S64; | |
533 | } | |
8cf9540a MD |
534 | ret = bytecode_push(&ctx->bytecode, &cast_insn, |
535 | 1, sizeof(cast_insn)); | |
536 | if (ret) | |
537 | return ret; | |
538 | } | |
953192ba MD |
539 | /* We now know where the logical op can skip. */ |
540 | target_loc = (uint16_t) bytecode_get_len(&ctx->bytecode->b); | |
541 | ret = bytecode_patch(&ctx->bytecode, | |
542 | &target_loc, /* Offset to jump to */ | |
543 | skip_offset_loc, /* Where to patch */ | |
544 | sizeof(uint16_t)); | |
545 | return ret; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Postorder traversal of the tree. We need the children result before | |
550 | * we can evaluate the parent. | |
551 | */ | |
552 | static | |
553 | int recursive_visit_gen_bytecode(struct filter_parser_ctx *ctx, | |
554 | struct ir_op *node) | |
555 | { | |
556 | switch (node->op) { | |
557 | case IR_OP_UNKNOWN: | |
558 | default: | |
559 | fprintf(stderr, "[error] Unknown node type in %s\n", | |
560 | __func__); | |
561 | return -EINVAL; | |
562 | ||
563 | case IR_OP_ROOT: | |
564 | return visit_node_root(ctx, node); | |
565 | case IR_OP_LOAD: | |
566 | return visit_node_load(ctx, node); | |
567 | case IR_OP_UNARY: | |
568 | return visit_node_unary(ctx, node); | |
569 | case IR_OP_BINARY: | |
570 | return visit_node_binary(ctx, node); | |
571 | case IR_OP_LOGICAL: | |
572 | return visit_node_logical(ctx, node); | |
573 | } | |
574 | } | |
575 | ||
a187da1a | 576 | LTTNG_HIDDEN |
953192ba MD |
577 | void filter_bytecode_free(struct filter_parser_ctx *ctx) |
578 | { | |
7ca1dc6f DG |
579 | if (!ctx) { |
580 | return; | |
581 | } | |
582 | ||
3f0c8837 DG |
583 | if (ctx->bytecode) { |
584 | free(ctx->bytecode); | |
585 | ctx->bytecode = NULL; | |
586 | } | |
587 | ||
588 | if (ctx->bytecode_reloc) { | |
589 | free(ctx->bytecode_reloc); | |
590 | ctx->bytecode_reloc = NULL; | |
591 | } | |
953192ba MD |
592 | } |
593 | ||
a187da1a | 594 | LTTNG_HIDDEN |
953192ba MD |
595 | int filter_visitor_bytecode_generate(struct filter_parser_ctx *ctx) |
596 | { | |
597 | int ret; | |
598 | ||
599 | ret = bytecode_init(&ctx->bytecode); | |
600 | if (ret) | |
601 | return ret; | |
602 | ret = bytecode_init(&ctx->bytecode_reloc); | |
603 | if (ret) | |
604 | goto error; | |
605 | ret = recursive_visit_gen_bytecode(ctx, ctx->ir_root); | |
606 | if (ret) | |
607 | goto error; | |
608 | ||
609 | /* Finally, append symbol table to bytecode */ | |
610 | ctx->bytecode->b.reloc_table_offset = bytecode_get_len(&ctx->bytecode->b); | |
611 | return bytecode_push(&ctx->bytecode, ctx->bytecode_reloc->b.data, | |
612 | 1, bytecode_get_len(&ctx->bytecode_reloc->b)); | |
613 | ||
614 | error: | |
615 | filter_bytecode_free(ctx); | |
616 | return ret; | |
617 | } |