Commit | Line | Data |
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4e3b3630 JR |
1 | /* |
2 | * lttng-bytecode.c | |
3 | * | |
4 | * LTTng UST bytecode code. | |
5 | * | |
6 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
24 | * SOFTWARE. | |
25 | */ | |
26 | ||
27 | #define _LGPL_SOURCE | |
28 | #include <stddef.h> | |
29 | #include <stdint.h> | |
30 | ||
31 | #include <urcu/rculist.h> | |
32 | ||
33 | #include "lttng-bytecode.h" | |
34 | #include "ust-events-internal.h" | |
35 | ||
36 | static const char *opnames[] = { | |
37 | [ BYTECODE_OP_UNKNOWN ] = "UNKNOWN", | |
38 | ||
39 | [ BYTECODE_OP_RETURN ] = "RETURN", | |
40 | ||
41 | /* binary */ | |
42 | [ BYTECODE_OP_MUL ] = "MUL", | |
43 | [ BYTECODE_OP_DIV ] = "DIV", | |
44 | [ BYTECODE_OP_MOD ] = "MOD", | |
45 | [ BYTECODE_OP_PLUS ] = "PLUS", | |
46 | [ BYTECODE_OP_MINUS ] = "MINUS", | |
47 | [ BYTECODE_OP_BIT_RSHIFT ] = "BIT_RSHIFT", | |
48 | [ BYTECODE_OP_BIT_LSHIFT ] = "BIT_LSHIFT", | |
49 | [ BYTECODE_OP_BIT_AND ] = "BIT_AND", | |
50 | [ BYTECODE_OP_BIT_OR ] = "BIT_OR", | |
51 | [ BYTECODE_OP_BIT_XOR ] = "BIT_XOR", | |
52 | ||
53 | /* binary comparators */ | |
54 | [ BYTECODE_OP_EQ ] = "EQ", | |
55 | [ BYTECODE_OP_NE ] = "NE", | |
56 | [ BYTECODE_OP_GT ] = "GT", | |
57 | [ BYTECODE_OP_LT ] = "LT", | |
58 | [ BYTECODE_OP_GE ] = "GE", | |
59 | [ BYTECODE_OP_LE ] = "LE", | |
60 | ||
61 | /* string binary comparators */ | |
62 | [ BYTECODE_OP_EQ_STRING ] = "EQ_STRING", | |
63 | [ BYTECODE_OP_NE_STRING ] = "NE_STRING", | |
64 | [ BYTECODE_OP_GT_STRING ] = "GT_STRING", | |
65 | [ BYTECODE_OP_LT_STRING ] = "LT_STRING", | |
66 | [ BYTECODE_OP_GE_STRING ] = "GE_STRING", | |
67 | [ BYTECODE_OP_LE_STRING ] = "LE_STRING", | |
68 | ||
69 | /* s64 binary comparators */ | |
70 | [ BYTECODE_OP_EQ_S64 ] = "EQ_S64", | |
71 | [ BYTECODE_OP_NE_S64 ] = "NE_S64", | |
72 | [ BYTECODE_OP_GT_S64 ] = "GT_S64", | |
73 | [ BYTECODE_OP_LT_S64 ] = "LT_S64", | |
74 | [ BYTECODE_OP_GE_S64 ] = "GE_S64", | |
75 | [ BYTECODE_OP_LE_S64 ] = "LE_S64", | |
76 | ||
77 | /* double binary comparators */ | |
78 | [ BYTECODE_OP_EQ_DOUBLE ] = "EQ_DOUBLE", | |
79 | [ BYTECODE_OP_NE_DOUBLE ] = "NE_DOUBLE", | |
80 | [ BYTECODE_OP_GT_DOUBLE ] = "GT_DOUBLE", | |
81 | [ BYTECODE_OP_LT_DOUBLE ] = "LT_DOUBLE", | |
82 | [ BYTECODE_OP_GE_DOUBLE ] = "GE_DOUBLE", | |
83 | [ BYTECODE_OP_LE_DOUBLE ] = "LE_DOUBLE", | |
84 | ||
85 | /* Mixed S64-double binary comparators */ | |
86 | [ BYTECODE_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64", | |
87 | [ BYTECODE_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64", | |
88 | [ BYTECODE_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64", | |
89 | [ BYTECODE_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64", | |
90 | [ BYTECODE_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64", | |
91 | [ BYTECODE_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64", | |
92 | ||
93 | [ BYTECODE_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE", | |
94 | [ BYTECODE_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE", | |
95 | [ BYTECODE_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE", | |
96 | [ BYTECODE_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE", | |
97 | [ BYTECODE_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE", | |
98 | [ BYTECODE_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE", | |
99 | ||
100 | /* unary */ | |
101 | [ BYTECODE_OP_UNARY_PLUS ] = "UNARY_PLUS", | |
102 | [ BYTECODE_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
103 | [ BYTECODE_OP_UNARY_NOT ] = "UNARY_NOT", | |
104 | [ BYTECODE_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64", | |
105 | [ BYTECODE_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64", | |
106 | [ BYTECODE_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64", | |
107 | [ BYTECODE_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE", | |
108 | [ BYTECODE_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE", | |
109 | [ BYTECODE_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE", | |
110 | ||
111 | /* logical */ | |
112 | [ BYTECODE_OP_AND ] = "AND", | |
113 | [ BYTECODE_OP_OR ] = "OR", | |
114 | ||
115 | /* load field ref */ | |
116 | [ BYTECODE_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", | |
117 | [ BYTECODE_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", | |
118 | [ BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", | |
119 | [ BYTECODE_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", | |
120 | [ BYTECODE_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", | |
121 | ||
122 | /* load from immediate operand */ | |
123 | [ BYTECODE_OP_LOAD_STRING ] = "LOAD_STRING", | |
124 | [ BYTECODE_OP_LOAD_S64 ] = "LOAD_S64", | |
125 | [ BYTECODE_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", | |
126 | ||
127 | /* cast */ | |
128 | [ BYTECODE_OP_CAST_TO_S64 ] = "CAST_TO_S64", | |
129 | [ BYTECODE_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64", | |
130 | [ BYTECODE_OP_CAST_NOP ] = "CAST_NOP", | |
131 | ||
132 | /* get context ref */ | |
133 | [ BYTECODE_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF", | |
134 | [ BYTECODE_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING", | |
135 | [ BYTECODE_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64", | |
136 | [ BYTECODE_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE", | |
137 | ||
138 | /* load userspace field ref */ | |
139 | [ BYTECODE_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING", | |
140 | [ BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE", | |
141 | ||
142 | /* | |
143 | * load immediate star globbing pattern (literal string) | |
144 | * from immediate. | |
145 | */ | |
146 | [ BYTECODE_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING", | |
147 | ||
148 | /* globbing pattern binary operator: apply to */ | |
149 | [ BYTECODE_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING", | |
150 | [ BYTECODE_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING", | |
151 | ||
152 | /* | |
153 | * Instructions for recursive traversal through composed types. | |
154 | */ | |
155 | [ BYTECODE_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT", | |
156 | [ BYTECODE_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT", | |
157 | [ BYTECODE_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT", | |
158 | ||
159 | [ BYTECODE_OP_GET_SYMBOL ] = "GET_SYMBOL", | |
160 | [ BYTECODE_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD", | |
161 | [ BYTECODE_OP_GET_INDEX_U16 ] = "GET_INDEX_U16", | |
162 | [ BYTECODE_OP_GET_INDEX_U64 ] = "GET_INDEX_U64", | |
163 | ||
164 | [ BYTECODE_OP_LOAD_FIELD ] = "LOAD_FIELD", | |
165 | [ BYTECODE_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8", | |
166 | [ BYTECODE_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16", | |
167 | [ BYTECODE_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32", | |
168 | [ BYTECODE_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64", | |
169 | [ BYTECODE_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8", | |
170 | [ BYTECODE_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16", | |
171 | [ BYTECODE_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32", | |
172 | [ BYTECODE_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64", | |
173 | [ BYTECODE_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING", | |
174 | [ BYTECODE_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE", | |
175 | [ BYTECODE_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE", | |
176 | ||
177 | [ BYTECODE_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT", | |
178 | ||
179 | [ BYTECODE_OP_RETURN_S64 ] = "RETURN_S64", | |
180 | }; | |
181 | ||
182 | const char *print_op(enum bytecode_op op) | |
183 | { | |
184 | if (op >= NR_BYTECODE_OPS) | |
185 | return "UNKNOWN"; | |
186 | else | |
187 | return opnames[op]; | |
188 | } | |
189 | ||
190 | static | |
191 | int apply_field_reloc(const struct lttng_event_desc *event_desc, | |
192 | struct bytecode_runtime *runtime, | |
193 | uint32_t runtime_len, | |
194 | uint32_t reloc_offset, | |
195 | const char *field_name, | |
196 | enum bytecode_op bytecode_op) | |
197 | { | |
198 | const struct lttng_event_field *fields, *field = NULL; | |
199 | unsigned int nr_fields, i; | |
200 | struct load_op *op; | |
201 | uint32_t field_offset = 0; | |
202 | ||
203 | dbg_printf("Apply field reloc: %u %s\n", reloc_offset, field_name); | |
204 | ||
205 | /* Lookup event by name */ | |
206 | if (!event_desc) | |
207 | return -EINVAL; | |
208 | fields = event_desc->fields; | |
209 | if (!fields) | |
210 | return -EINVAL; | |
211 | nr_fields = event_desc->nr_fields; | |
212 | for (i = 0; i < nr_fields; i++) { | |
213 | if (fields[i].u.ext.nofilter) { | |
214 | continue; | |
215 | } | |
216 | if (!strcmp(fields[i].name, field_name)) { | |
217 | field = &fields[i]; | |
218 | break; | |
219 | } | |
220 | /* compute field offset */ | |
221 | switch (fields[i].type.atype) { | |
222 | case atype_integer: | |
223 | case atype_enum: | |
224 | case atype_enum_nestable: | |
225 | field_offset += sizeof(int64_t); | |
226 | break; | |
227 | case atype_array: | |
228 | case atype_array_nestable: | |
229 | case atype_sequence: | |
230 | case atype_sequence_nestable: | |
231 | field_offset += sizeof(unsigned long); | |
232 | field_offset += sizeof(void *); | |
233 | break; | |
234 | case atype_string: | |
235 | field_offset += sizeof(void *); | |
236 | break; | |
237 | case atype_float: | |
238 | field_offset += sizeof(double); | |
239 | break; | |
240 | default: | |
241 | return -EINVAL; | |
242 | } | |
243 | } | |
244 | if (!field) | |
245 | return -EINVAL; | |
246 | ||
247 | /* Check if field offset is too large for 16-bit offset */ | |
248 | if (field_offset > FILTER_BYTECODE_MAX_LEN - 1) | |
249 | return -EINVAL; | |
250 | ||
251 | /* set type */ | |
252 | op = (struct load_op *) &runtime->code[reloc_offset]; | |
253 | ||
254 | switch (bytecode_op) { | |
255 | case BYTECODE_OP_LOAD_FIELD_REF: | |
256 | { | |
257 | struct field_ref *field_ref; | |
258 | ||
259 | field_ref = (struct field_ref *) op->data; | |
260 | switch (field->type.atype) { | |
261 | case atype_integer: | |
262 | case atype_enum: | |
263 | case atype_enum_nestable: | |
264 | op->op = BYTECODE_OP_LOAD_FIELD_REF_S64; | |
265 | break; | |
266 | case atype_array: | |
267 | case atype_array_nestable: | |
268 | case atype_sequence: | |
269 | case atype_sequence_nestable: | |
270 | op->op = BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE; | |
271 | break; | |
272 | case atype_string: | |
273 | op->op = BYTECODE_OP_LOAD_FIELD_REF_STRING; | |
274 | break; | |
275 | case atype_float: | |
276 | op->op = BYTECODE_OP_LOAD_FIELD_REF_DOUBLE; | |
277 | break; | |
278 | default: | |
279 | return -EINVAL; | |
280 | } | |
281 | /* set offset */ | |
282 | field_ref->offset = (uint16_t) field_offset; | |
283 | break; | |
284 | } | |
285 | default: | |
286 | return -EINVAL; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static | |
292 | int apply_context_reloc(struct bytecode_runtime *runtime, | |
293 | uint32_t runtime_len, | |
294 | uint32_t reloc_offset, | |
295 | const char *context_name, | |
296 | enum bytecode_op bytecode_op) | |
297 | { | |
298 | struct load_op *op; | |
299 | struct lttng_ctx_field *ctx_field; | |
300 | int idx; | |
301 | struct lttng_ctx *ctx = *runtime->p.pctx; | |
302 | ||
303 | dbg_printf("Apply context reloc: %u %s\n", reloc_offset, context_name); | |
304 | ||
305 | /* Get context index */ | |
306 | idx = lttng_get_context_index(ctx, context_name); | |
307 | if (idx < 0) { | |
308 | if (lttng_context_is_app(context_name)) { | |
309 | int ret; | |
310 | ||
311 | ret = lttng_ust_add_app_context_to_ctx_rcu(context_name, | |
312 | &ctx); | |
313 | if (ret) | |
314 | return ret; | |
315 | idx = lttng_get_context_index(ctx, context_name); | |
316 | if (idx < 0) | |
317 | return -ENOENT; | |
318 | } else { | |
319 | return -ENOENT; | |
320 | } | |
321 | } | |
322 | /* Check if idx is too large for 16-bit offset */ | |
323 | if (idx > FILTER_BYTECODE_MAX_LEN - 1) | |
324 | return -EINVAL; | |
325 | ||
326 | /* Get context return type */ | |
327 | ctx_field = &ctx->fields[idx]; | |
328 | op = (struct load_op *) &runtime->code[reloc_offset]; | |
329 | ||
330 | switch (bytecode_op) { | |
331 | case BYTECODE_OP_GET_CONTEXT_REF: | |
332 | { | |
333 | struct field_ref *field_ref; | |
334 | ||
335 | field_ref = (struct field_ref *) op->data; | |
336 | switch (ctx_field->event_field.type.atype) { | |
337 | case atype_integer: | |
338 | case atype_enum: | |
339 | case atype_enum_nestable: | |
340 | op->op = BYTECODE_OP_GET_CONTEXT_REF_S64; | |
341 | break; | |
342 | /* Sequence and array supported as string */ | |
343 | case atype_string: | |
344 | case atype_array: | |
345 | case atype_array_nestable: | |
346 | case atype_sequence: | |
347 | case atype_sequence_nestable: | |
348 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; | |
349 | break; | |
350 | case atype_float: | |
351 | op->op = BYTECODE_OP_GET_CONTEXT_REF_DOUBLE; | |
352 | break; | |
353 | case atype_dynamic: | |
354 | op->op = BYTECODE_OP_GET_CONTEXT_REF; | |
355 | break; | |
356 | default: | |
357 | return -EINVAL; | |
358 | } | |
359 | /* set offset to context index within channel contexts */ | |
360 | field_ref->offset = (uint16_t) idx; | |
361 | break; | |
362 | } | |
363 | default: | |
364 | return -EINVAL; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static | |
370 | int apply_reloc(const struct lttng_event_desc *event_desc, | |
371 | struct bytecode_runtime *runtime, | |
372 | uint32_t runtime_len, | |
373 | uint32_t reloc_offset, | |
374 | const char *name) | |
375 | { | |
376 | struct load_op *op; | |
377 | ||
378 | dbg_printf("Apply reloc: %u %s\n", reloc_offset, name); | |
379 | ||
380 | /* Ensure that the reloc is within the code */ | |
381 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
382 | return -EINVAL; | |
383 | ||
384 | op = (struct load_op *) &runtime->code[reloc_offset]; | |
385 | switch (op->op) { | |
386 | case BYTECODE_OP_LOAD_FIELD_REF: | |
387 | return apply_field_reloc(event_desc, runtime, runtime_len, | |
388 | reloc_offset, name, op->op); | |
389 | case BYTECODE_OP_GET_CONTEXT_REF: | |
390 | return apply_context_reloc(runtime, runtime_len, | |
391 | reloc_offset, name, op->op); | |
392 | case BYTECODE_OP_GET_SYMBOL: | |
393 | case BYTECODE_OP_GET_SYMBOL_FIELD: | |
394 | /* | |
395 | * Will be handled by load specialize phase or | |
396 | * dynamically by interpreter. | |
397 | */ | |
398 | return 0; | |
399 | default: | |
400 | ERR("Unknown reloc op type %u\n", op->op); | |
401 | return -EINVAL; | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static | |
407 | int bytecode_is_linked(struct lttng_ust_bytecode_node *bytecode, | |
408 | struct cds_list_head *bytecode_runtime_head) | |
409 | { | |
410 | struct lttng_bytecode_runtime *bc_runtime; | |
411 | ||
412 | cds_list_for_each_entry(bc_runtime, bytecode_runtime_head, node) { | |
413 | if (bc_runtime->bc == bytecode) | |
414 | return 1; | |
415 | } | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Take a bytecode with reloc table and link it to an event to create a | |
421 | * bytecode runtime. | |
422 | */ | |
423 | static | |
424 | int link_bytecode(const struct lttng_event_desc *event_desc, | |
425 | struct lttng_ctx **ctx, | |
426 | struct lttng_ust_bytecode_node *bytecode, | |
427 | struct cds_list_head *insert_loc) | |
428 | { | |
429 | int ret, offset, next_offset; | |
430 | struct bytecode_runtime *runtime = NULL; | |
431 | size_t runtime_alloc_len; | |
432 | ||
433 | if (!bytecode) | |
434 | return 0; | |
435 | /* Bytecode already linked */ | |
436 | if (bytecode_is_linked(bytecode, insert_loc)) | |
437 | return 0; | |
438 | ||
439 | dbg_printf("Linking...\n"); | |
440 | ||
441 | /* We don't need the reloc table in the runtime */ | |
442 | runtime_alloc_len = sizeof(*runtime) + bytecode->bc.reloc_offset; | |
443 | runtime = zmalloc(runtime_alloc_len); | |
444 | if (!runtime) { | |
445 | ret = -ENOMEM; | |
446 | goto alloc_error; | |
447 | } | |
448 | runtime->p.bc = bytecode; | |
449 | runtime->p.pctx = ctx; | |
450 | runtime->len = bytecode->bc.reloc_offset; | |
451 | /* copy original bytecode */ | |
452 | memcpy(runtime->code, bytecode->bc.data, runtime->len); | |
453 | /* | |
454 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
455 | * followed by a string (field name). | |
456 | */ | |
457 | for (offset = bytecode->bc.reloc_offset; | |
458 | offset < bytecode->bc.len; | |
459 | offset = next_offset) { | |
460 | uint16_t reloc_offset = | |
461 | *(uint16_t *) &bytecode->bc.data[offset]; | |
462 | const char *name = | |
463 | (const char *) &bytecode->bc.data[offset + sizeof(uint16_t)]; | |
464 | ||
465 | ret = apply_reloc(event_desc, runtime, runtime->len, reloc_offset, name); | |
466 | if (ret) { | |
467 | goto link_error; | |
468 | } | |
469 | next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; | |
470 | } | |
471 | /* Validate bytecode */ | |
472 | ret = lttng_bytecode_validate(runtime); | |
473 | if (ret) { | |
474 | goto link_error; | |
475 | } | |
476 | /* Specialize bytecode */ | |
477 | ret = lttng_bytecode_specialize(event_desc, runtime); | |
478 | if (ret) { | |
479 | goto link_error; | |
480 | } | |
481 | ||
482 | switch (bytecode->type) { | |
483 | case LTTNG_UST_BYTECODE_NODE_TYPE_FILTER: | |
484 | runtime->p.interpreter_funcs.filter = lttng_bytecode_filter_interpret; | |
485 | break; | |
486 | case LTTNG_UST_BYTECODE_NODE_TYPE_CAPTURE: | |
487 | runtime->p.interpreter_funcs.capture = lttng_bytecode_capture_interpret; | |
488 | break; | |
489 | default: | |
490 | abort(); | |
491 | } | |
492 | ||
493 | runtime->p.link_failed = 0; | |
494 | cds_list_add_rcu(&runtime->p.node, insert_loc); | |
495 | dbg_printf("Linking successful.\n"); | |
496 | return 0; | |
497 | ||
498 | link_error: | |
499 | switch (bytecode->type) { | |
500 | case LTTNG_UST_BYTECODE_NODE_TYPE_FILTER: | |
501 | runtime->p.interpreter_funcs.filter = lttng_bytecode_filter_interpret_false; | |
502 | break; | |
503 | case LTTNG_UST_BYTECODE_NODE_TYPE_CAPTURE: | |
504 | runtime->p.interpreter_funcs.capture = lttng_bytecode_capture_interpret_false; | |
505 | break; | |
506 | default: | |
507 | abort(); | |
508 | } | |
509 | ||
510 | runtime->p.link_failed = 1; | |
511 | cds_list_add_rcu(&runtime->p.node, insert_loc); | |
512 | alloc_error: | |
513 | dbg_printf("Linking failed.\n"); | |
514 | return ret; | |
515 | } | |
516 | ||
517 | void lttng_bytecode_filter_sync_state(struct lttng_bytecode_runtime *runtime) | |
518 | { | |
519 | struct lttng_ust_bytecode_node *bc = runtime->bc; | |
520 | ||
521 | if (!bc->enabler->enabled || runtime->link_failed) | |
522 | runtime->interpreter_funcs.filter = lttng_bytecode_filter_interpret_false; | |
523 | else | |
524 | runtime->interpreter_funcs.filter = lttng_bytecode_filter_interpret; | |
525 | } | |
526 | ||
527 | void lttng_bytecode_capture_sync_state(struct lttng_bytecode_runtime *runtime) | |
528 | { | |
529 | struct lttng_ust_bytecode_node *bc = runtime->bc; | |
530 | ||
531 | if (!bc->enabler->enabled || runtime->link_failed) | |
532 | runtime->interpreter_funcs.capture = lttng_bytecode_capture_interpret_false; | |
533 | else | |
534 | runtime->interpreter_funcs.capture = lttng_bytecode_capture_interpret; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Given the lists of bytecode programs of an instance (trigger or event) and | |
539 | * of a matching enabler, try to link all the enabler's bytecode programs with | |
540 | * the instance. | |
541 | * | |
542 | * This function is called after we confirmed that name enabler and the | |
543 | * instance are name matching (or glob pattern matching). | |
544 | */ | |
545 | void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc, | |
546 | struct lttng_ctx **ctx, | |
547 | struct cds_list_head *instance_bytecode_head, | |
548 | struct cds_list_head *enabler_bytecode_head) | |
549 | { | |
550 | struct lttng_ust_bytecode_node *enabler_bc; | |
551 | struct lttng_bytecode_runtime *runtime; | |
552 | ||
553 | assert(event_desc); | |
554 | ||
555 | /* Go over all the bytecode programs of the enabler. */ | |
556 | cds_list_for_each_entry(enabler_bc, enabler_bytecode_head, node) { | |
557 | int found = 0, ret; | |
558 | struct cds_list_head *insert_loc; | |
559 | ||
560 | /* | |
561 | * Check if the current enabler bytecode program is already | |
562 | * linked with the instance. | |
563 | */ | |
564 | cds_list_for_each_entry(runtime, instance_bytecode_head, node) { | |
565 | if (runtime->bc == enabler_bc) { | |
566 | found = 1; | |
567 | break; | |
568 | } | |
569 | } | |
570 | ||
571 | /* | |
572 | * Skip bytecode already linked, go to the next enabler | |
573 | * bytecode program. | |
574 | */ | |
575 | if (found) | |
576 | continue; | |
577 | ||
578 | /* | |
579 | * Insert at specified priority (seqnum) in increasing | |
580 | * order. If there already is a bytecode of the same priority, | |
581 | * insert the new bytecode right after it. | |
582 | */ | |
583 | cds_list_for_each_entry_reverse(runtime, | |
584 | instance_bytecode_head, node) { | |
585 | if (runtime->bc->bc.seqnum <= enabler_bc->bc.seqnum) { | |
586 | /* insert here */ | |
587 | insert_loc = &runtime->node; | |
588 | goto add_within; | |
589 | } | |
590 | } | |
591 | ||
592 | /* Add to head to list */ | |
593 | insert_loc = instance_bytecode_head; | |
594 | add_within: | |
595 | dbg_printf("linking bytecode\n"); | |
596 | ret = link_bytecode(event_desc, ctx, enabler_bc, insert_loc); | |
597 | if (ret) { | |
598 | dbg_printf("[lttng filter] warning: cannot link event bytecode\n"); | |
599 | } | |
600 | } | |
601 | } | |
602 | ||
603 | /* | |
604 | * We own the bytecode if we return success. | |
605 | */ | |
606 | int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
607 | struct lttng_ust_bytecode_node *bytecode) | |
608 | { | |
609 | cds_list_add(&bytecode->node, &enabler->filter_bytecode_head); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static | |
614 | void free_filter_runtime(struct cds_list_head *bytecode_runtime_head) | |
615 | { | |
616 | struct bytecode_runtime *runtime, *tmp; | |
617 | ||
618 | cds_list_for_each_entry_safe(runtime, tmp, bytecode_runtime_head, | |
619 | p.node) { | |
620 | free(runtime->data); | |
621 | free(runtime); | |
622 | } | |
623 | } | |
624 | ||
625 | void lttng_free_event_filter_runtime(struct lttng_event *event) | |
626 | { | |
627 | free_filter_runtime(&event->filter_bytecode_runtime_head); | |
628 | } | |
629 | ||
630 | void lttng_free_trigger_filter_runtime(struct lttng_trigger *trigger) | |
631 | { | |
632 | free_filter_runtime(&trigger->filter_bytecode_runtime_head); | |
633 | } | |
634 | ||
635 | /* For backward compatibility. Leave those exported symbols in place. */ | |
636 | void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime) | |
637 | { | |
638 | } |