4 * LTTng UST filter code.
6 * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
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
28 #include <urcu/rculist.h>
29 #include "lttng-filter.h"
31 static const char *opnames
[] = {
32 [ FILTER_OP_UNKNOWN
] = "UNKNOWN",
34 [ FILTER_OP_RETURN
] = "RETURN",
37 [ FILTER_OP_MUL
] = "MUL",
38 [ FILTER_OP_DIV
] = "DIV",
39 [ FILTER_OP_MOD
] = "MOD",
40 [ FILTER_OP_PLUS
] = "PLUS",
41 [ FILTER_OP_MINUS
] = "MINUS",
42 [ FILTER_OP_RSHIFT
] = "RSHIFT",
43 [ FILTER_OP_LSHIFT
] = "LSHIFT",
44 [ FILTER_OP_BIN_AND
] = "BIN_AND",
45 [ FILTER_OP_BIN_OR
] = "BIN_OR",
46 [ FILTER_OP_BIN_XOR
] = "BIN_XOR",
48 /* binary comparators */
49 [ FILTER_OP_EQ
] = "EQ",
50 [ FILTER_OP_NE
] = "NE",
51 [ FILTER_OP_GT
] = "GT",
52 [ FILTER_OP_LT
] = "LT",
53 [ FILTER_OP_GE
] = "GE",
54 [ FILTER_OP_LE
] = "LE",
56 /* string binary comparators */
57 [ FILTER_OP_EQ_STRING
] = "EQ_STRING",
58 [ FILTER_OP_NE_STRING
] = "NE_STRING",
59 [ FILTER_OP_GT_STRING
] = "GT_STRING",
60 [ FILTER_OP_LT_STRING
] = "LT_STRING",
61 [ FILTER_OP_GE_STRING
] = "GE_STRING",
62 [ FILTER_OP_LE_STRING
] = "LE_STRING",
64 /* s64 binary comparators */
65 [ FILTER_OP_EQ_S64
] = "EQ_S64",
66 [ FILTER_OP_NE_S64
] = "NE_S64",
67 [ FILTER_OP_GT_S64
] = "GT_S64",
68 [ FILTER_OP_LT_S64
] = "LT_S64",
69 [ FILTER_OP_GE_S64
] = "GE_S64",
70 [ FILTER_OP_LE_S64
] = "LE_S64",
72 /* double binary comparators */
73 [ FILTER_OP_EQ_DOUBLE
] = "EQ_DOUBLE",
74 [ FILTER_OP_NE_DOUBLE
] = "NE_DOUBLE",
75 [ FILTER_OP_GT_DOUBLE
] = "GT_DOUBLE",
76 [ FILTER_OP_LT_DOUBLE
] = "LT_DOUBLE",
77 [ FILTER_OP_GE_DOUBLE
] = "GE_DOUBLE",
78 [ FILTER_OP_LE_DOUBLE
] = "LE_DOUBLE",
80 /* Mixed S64-double binary comparators */
81 [ FILTER_OP_EQ_DOUBLE_S64
] = "EQ_DOUBLE_S64",
82 [ FILTER_OP_NE_DOUBLE_S64
] = "NE_DOUBLE_S64",
83 [ FILTER_OP_GT_DOUBLE_S64
] = "GT_DOUBLE_S64",
84 [ FILTER_OP_LT_DOUBLE_S64
] = "LT_DOUBLE_S64",
85 [ FILTER_OP_GE_DOUBLE_S64
] = "GE_DOUBLE_S64",
86 [ FILTER_OP_LE_DOUBLE_S64
] = "LE_DOUBLE_S64",
88 [ FILTER_OP_EQ_S64_DOUBLE
] = "EQ_S64_DOUBLE",
89 [ FILTER_OP_NE_S64_DOUBLE
] = "NE_S64_DOUBLE",
90 [ FILTER_OP_GT_S64_DOUBLE
] = "GT_S64_DOUBLE",
91 [ FILTER_OP_LT_S64_DOUBLE
] = "LT_S64_DOUBLE",
92 [ FILTER_OP_GE_S64_DOUBLE
] = "GE_S64_DOUBLE",
93 [ FILTER_OP_LE_S64_DOUBLE
] = "LE_S64_DOUBLE",
96 [ FILTER_OP_UNARY_PLUS
] = "UNARY_PLUS",
97 [ FILTER_OP_UNARY_MINUS
] = "UNARY_MINUS",
98 [ FILTER_OP_UNARY_NOT
] = "UNARY_NOT",
99 [ FILTER_OP_UNARY_PLUS_S64
] = "UNARY_PLUS_S64",
100 [ FILTER_OP_UNARY_MINUS_S64
] = "UNARY_MINUS_S64",
101 [ FILTER_OP_UNARY_NOT_S64
] = "UNARY_NOT_S64",
102 [ FILTER_OP_UNARY_PLUS_DOUBLE
] = "UNARY_PLUS_DOUBLE",
103 [ FILTER_OP_UNARY_MINUS_DOUBLE
] = "UNARY_MINUS_DOUBLE",
104 [ FILTER_OP_UNARY_NOT_DOUBLE
] = "UNARY_NOT_DOUBLE",
107 [ FILTER_OP_AND
] = "AND",
108 [ FILTER_OP_OR
] = "OR",
111 [ FILTER_OP_LOAD_FIELD_REF
] = "LOAD_FIELD_REF",
112 [ FILTER_OP_LOAD_FIELD_REF_STRING
] = "LOAD_FIELD_REF_STRING",
113 [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE
] = "LOAD_FIELD_REF_SEQUENCE",
114 [ FILTER_OP_LOAD_FIELD_REF_S64
] = "LOAD_FIELD_REF_S64",
115 [ FILTER_OP_LOAD_FIELD_REF_DOUBLE
] = "LOAD_FIELD_REF_DOUBLE",
117 /* load from immediate operand */
118 [ FILTER_OP_LOAD_STRING
] = "LOAD_STRING",
119 [ FILTER_OP_LOAD_S64
] = "LOAD_S64",
120 [ FILTER_OP_LOAD_DOUBLE
] = "LOAD_DOUBLE",
123 [ FILTER_OP_CAST_TO_S64
] = "CAST_TO_S64",
124 [ FILTER_OP_CAST_DOUBLE_TO_S64
] = "CAST_DOUBLE_TO_S64",
125 [ FILTER_OP_CAST_NOP
] = "CAST_NOP",
127 /* get context ref */
128 [ FILTER_OP_GET_CONTEXT_REF
] = "GET_CONTEXT_REF",
129 [ FILTER_OP_GET_CONTEXT_REF_STRING
] = "GET_CONTEXT_REF_STRING",
130 [ FILTER_OP_GET_CONTEXT_REF_S64
] = "GET_CONTEXT_REF_S64",
131 [ FILTER_OP_GET_CONTEXT_REF_DOUBLE
] = "GET_CONTEXT_REF_DOUBLE",
133 /* load userspace field ref */
134 [ FILTER_OP_LOAD_FIELD_REF_USER_STRING
] = "LOAD_FIELD_REF_USER_STRING",
135 [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE
] = "LOAD_FIELD_REF_USER_SEQUENCE",
138 * load immediate star globbing pattern (literal string)
141 [ FILTER_OP_LOAD_STAR_GLOB_STRING
] = "LOAD_STAR_GLOB_STRING",
143 /* globbing pattern binary operator: apply to */
144 [ FILTER_OP_EQ_STAR_GLOB_STRING
] = "EQ_STAR_GLOB_STRING",
145 [ FILTER_OP_NE_STAR_GLOB_STRING
] = "NE_STAR_GLOB_STRING",
148 const char *print_op(enum filter_op op
)
150 if (op
>= NR_FILTER_OPS
)
157 int apply_field_reloc(struct lttng_event
*event
,
158 struct bytecode_runtime
*runtime
,
159 uint32_t runtime_len
,
160 uint32_t reloc_offset
,
161 const char *field_name
)
163 const struct lttng_event_desc
*desc
;
164 const struct lttng_event_field
*fields
, *field
= NULL
;
165 unsigned int nr_fields
, i
;
166 struct field_ref
*field_ref
;
168 uint32_t field_offset
= 0;
170 dbg_printf("Apply field reloc: %u %s\n", reloc_offset
, field_name
);
172 /* Lookup event by name */
176 fields
= desc
->fields
;
179 nr_fields
= desc
->nr_fields
;
180 for (i
= 0; i
< nr_fields
; i
++) {
181 if (!strcmp(fields
[i
].name
, field_name
)) {
185 /* compute field offset */
186 switch (fields
[i
].type
.atype
) {
189 field_offset
+= sizeof(int64_t);
193 field_offset
+= sizeof(unsigned long);
194 field_offset
+= sizeof(void *);
197 field_offset
+= sizeof(void *);
200 field_offset
+= sizeof(double);
209 /* Check if field offset is too large for 16-bit offset */
210 if (field_offset
> FILTER_BYTECODE_MAX_LEN
- 1)
214 op
= (struct load_op
*) &runtime
->data
[reloc_offset
];
215 field_ref
= (struct field_ref
*) op
->data
;
216 switch (field
->type
.atype
) {
219 op
->op
= FILTER_OP_LOAD_FIELD_REF_S64
;
223 op
->op
= FILTER_OP_LOAD_FIELD_REF_SEQUENCE
;
226 op
->op
= FILTER_OP_LOAD_FIELD_REF_STRING
;
229 op
->op
= FILTER_OP_LOAD_FIELD_REF_DOUBLE
;
235 field_ref
->offset
= (uint16_t) field_offset
;
240 int apply_context_reloc(struct lttng_event
*event
,
241 struct bytecode_runtime
*runtime
,
242 uint32_t runtime_len
,
243 uint32_t reloc_offset
,
244 const char *context_name
)
246 struct field_ref
*field_ref
;
248 struct lttng_ctx_field
*ctx_field
;
250 struct lttng_session
*session
= runtime
->p
.session
;
252 dbg_printf("Apply context reloc: %u %s\n", reloc_offset
, context_name
);
254 /* Get context index */
255 idx
= lttng_get_context_index(session
->ctx
, context_name
);
257 if (lttng_context_is_app(context_name
)) {
260 ret
= lttng_ust_add_app_context_to_ctx_rcu(context_name
,
264 idx
= lttng_get_context_index(session
->ctx
,
272 /* Check if idx is too large for 16-bit offset */
273 if (idx
> FILTER_BYTECODE_MAX_LEN
- 1)
276 /* Get context return type */
277 ctx_field
= &session
->ctx
->fields
[idx
];
278 op
= (struct load_op
*) &runtime
->data
[reloc_offset
];
279 field_ref
= (struct field_ref
*) op
->data
;
280 switch (ctx_field
->event_field
.type
.atype
) {
283 op
->op
= FILTER_OP_GET_CONTEXT_REF_S64
;
285 /* Sequence and array supported as string */
289 op
->op
= FILTER_OP_GET_CONTEXT_REF_STRING
;
292 op
->op
= FILTER_OP_GET_CONTEXT_REF_DOUBLE
;
295 op
->op
= FILTER_OP_GET_CONTEXT_REF
;
300 /* set offset to context index within channel contexts */
301 field_ref
->offset
= (uint16_t) idx
;
306 int apply_reloc(struct lttng_event
*event
,
307 struct bytecode_runtime
*runtime
,
308 uint32_t runtime_len
,
309 uint32_t reloc_offset
,
314 dbg_printf("Apply reloc: %u %s\n", reloc_offset
, name
);
316 /* Ensure that the reloc is within the code */
317 if (runtime_len
- reloc_offset
< sizeof(uint16_t))
320 op
= (struct load_op
*) &runtime
->data
[reloc_offset
];
322 case FILTER_OP_LOAD_FIELD_REF
:
323 return apply_field_reloc(event
, runtime
, runtime_len
,
325 case FILTER_OP_GET_CONTEXT_REF
:
326 return apply_context_reloc(event
, runtime
, runtime_len
,
329 ERR("Unknown reloc op type %u\n", op
->op
);
336 int bytecode_is_linked(struct lttng_ust_filter_bytecode_node
*filter_bytecode
,
337 struct lttng_event
*event
)
339 struct lttng_bytecode_runtime
*bc_runtime
;
341 cds_list_for_each_entry(bc_runtime
,
342 &event
->bytecode_runtime_head
, node
) {
343 if (bc_runtime
->bc
== filter_bytecode
)
350 * Take a bytecode with reloc table and link it to an event to create a
354 int _lttng_filter_event_link_bytecode(struct lttng_event
*event
,
355 struct lttng_ust_filter_bytecode_node
*filter_bytecode
,
356 struct cds_list_head
*insert_loc
)
358 int ret
, offset
, next_offset
;
359 struct bytecode_runtime
*runtime
= NULL
;
360 size_t runtime_alloc_len
;
362 if (!filter_bytecode
)
364 /* Bytecode already linked */
365 if (bytecode_is_linked(filter_bytecode
, event
))
368 dbg_printf("Linking...\n");
370 /* We don't need the reloc table in the runtime */
371 runtime_alloc_len
= sizeof(*runtime
) + filter_bytecode
->bc
.reloc_offset
;
372 runtime
= zmalloc(runtime_alloc_len
);
377 runtime
->p
.bc
= filter_bytecode
;
378 runtime
->p
.session
= event
->chan
->session
;
379 runtime
->len
= filter_bytecode
->bc
.reloc_offset
;
380 /* copy original bytecode */
381 memcpy(runtime
->data
, filter_bytecode
->bc
.data
, runtime
->len
);
383 * apply relocs. Those are a uint16_t (offset in bytecode)
384 * followed by a string (field name).
386 for (offset
= filter_bytecode
->bc
.reloc_offset
;
387 offset
< filter_bytecode
->bc
.len
;
388 offset
= next_offset
) {
389 uint16_t reloc_offset
=
390 *(uint16_t *) &filter_bytecode
->bc
.data
[offset
];
392 (const char *) &filter_bytecode
->bc
.data
[offset
+ sizeof(uint16_t)];
394 ret
= apply_reloc(event
, runtime
, runtime
->len
, reloc_offset
, name
);
398 next_offset
= offset
+ sizeof(uint16_t) + strlen(name
) + 1;
400 /* Validate bytecode */
401 ret
= lttng_filter_validate_bytecode(runtime
);
405 /* Specialize bytecode */
406 ret
= lttng_filter_specialize_bytecode(runtime
);
410 runtime
->p
.filter
= lttng_filter_interpret_bytecode
;
411 runtime
->p
.link_failed
= 0;
412 cds_list_add_rcu(&runtime
->p
.node
, insert_loc
);
413 dbg_printf("Linking successful.\n");
417 runtime
->p
.filter
= lttng_filter_false
;
418 runtime
->p
.link_failed
= 1;
419 cds_list_add_rcu(&runtime
->p
.node
, insert_loc
);
421 dbg_printf("Linking failed.\n");
425 void lttng_filter_sync_state(struct lttng_bytecode_runtime
*runtime
)
427 struct lttng_ust_filter_bytecode_node
*bc
= runtime
->bc
;
429 if (!bc
->enabler
->enabled
|| runtime
->link_failed
)
430 runtime
->filter
= lttng_filter_false
;
432 runtime
->filter
= lttng_filter_interpret_bytecode
;
436 * Link bytecode for all enablers referenced by an event.
438 void lttng_enabler_event_link_bytecode(struct lttng_event
*event
,
439 struct lttng_enabler
*enabler
)
441 struct lttng_ust_filter_bytecode_node
*bc
;
442 struct lttng_bytecode_runtime
*runtime
;
444 /* Can only be called for events with desc attached */
447 /* Link each bytecode. */
448 cds_list_for_each_entry(bc
, &enabler
->filter_bytecode_head
, node
) {
450 struct cds_list_head
*insert_loc
;
452 cds_list_for_each_entry(runtime
,
453 &event
->bytecode_runtime_head
, node
) {
454 if (runtime
->bc
== bc
) {
459 /* Skip bytecode already linked */
464 * Insert at specified priority (seqnum) in increasing
467 cds_list_for_each_entry_reverse(runtime
,
468 &event
->bytecode_runtime_head
, node
) {
469 if (runtime
->bc
->bc
.seqnum
< bc
->bc
.seqnum
) {
471 insert_loc
= &runtime
->node
;
475 /* Add to head to list */
476 insert_loc
= &event
->bytecode_runtime_head
;
478 dbg_printf("linking bytecode\n");
479 ret
= _lttng_filter_event_link_bytecode(event
, bc
,
482 dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
488 * We own the filter_bytecode if we return success.
490 int lttng_filter_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
491 struct lttng_ust_filter_bytecode_node
*filter_bytecode
)
493 cds_list_add(&filter_bytecode
->node
, &enabler
->filter_bytecode_head
);
497 void lttng_free_enabler_filter_bytecode(struct lttng_enabler
*enabler
)
499 struct lttng_ust_filter_bytecode_node
*filter_bytecode
, *tmp
;
501 cds_list_for_each_entry_safe(filter_bytecode
, tmp
,
502 &enabler
->filter_bytecode_head
, node
) {
503 free(filter_bytecode
);
507 void lttng_free_event_filter_runtime(struct lttng_event
*event
)
509 struct bytecode_runtime
*runtime
, *tmp
;
511 cds_list_for_each_entry_safe(runtime
, tmp
,
512 &event
->bytecode_runtime_head
, p
.node
) {