[lttng-ust.git] / liblttng-ust / lttng-filter.c

/*
 * lttng-filter.c
 *
 * LTTng UST filter code.
 *
 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "lttng-filter.h"

static const char *opnames[] = {
	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",

	[ FILTER_OP_RETURN ] = "RETURN",

	/* binary */
	[ FILTER_OP_MUL ] = "MUL",
	[ FILTER_OP_DIV ] = "DIV",
	[ FILTER_OP_MOD ] = "MOD",
	[ FILTER_OP_PLUS ] = "PLUS",
	[ FILTER_OP_MINUS ] = "MINUS",
	[ FILTER_OP_RSHIFT ] = "RSHIFT",
	[ FILTER_OP_LSHIFT ] = "LSHIFT",
	[ FILTER_OP_BIN_AND ] = "BIN_AND",
	[ FILTER_OP_BIN_OR ] = "BIN_OR",
	[ FILTER_OP_BIN_XOR ] = "BIN_XOR",

	/* binary comparators */
	[ FILTER_OP_EQ ] = "EQ",
	[ FILTER_OP_NE ] = "NE",
	[ FILTER_OP_GT ] = "GT",
	[ FILTER_OP_LT ] = "LT",
	[ FILTER_OP_GE ] = "GE",
	[ FILTER_OP_LE ] = "LE",

	/* string binary comparators */
	[ FILTER_OP_EQ_STRING ] = "EQ_STRING",
	[ FILTER_OP_NE_STRING ] = "NE_STRING",
	[ FILTER_OP_GT_STRING ] = "GT_STRING",
	[ FILTER_OP_LT_STRING ] = "LT_STRING",
	[ FILTER_OP_GE_STRING ] = "GE_STRING",
	[ FILTER_OP_LE_STRING ] = "LE_STRING",

	/* s64 binary comparators */
	[ FILTER_OP_EQ_S64 ] = "EQ_S64",
	[ FILTER_OP_NE_S64 ] = "NE_S64",
	[ FILTER_OP_GT_S64 ] = "GT_S64",
	[ FILTER_OP_LT_S64 ] = "LT_S64",
	[ FILTER_OP_GE_S64 ] = "GE_S64",
	[ FILTER_OP_LE_S64 ] = "LE_S64",

	/* double binary comparators */
	[ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
	[ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
	[ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
	[ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
	[ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
	[ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",

	/* Mixed S64-double binary comparators */
	[ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64",
	[ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64",
	[ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64",
	[ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64",
	[ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64",
	[ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64",

	[ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE",
	[ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE",
	[ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE",
	[ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE",
	[ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE",
	[ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE",

	/* unary */
	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
	[ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
	[ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
	[ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
	[ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
	[ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
	[ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",

	/* logical */
	[ FILTER_OP_AND ] = "AND",
	[ FILTER_OP_OR ] = "OR",

	/* load */
	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
	[ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
	[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
	[ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
	[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",

	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",

	/* cast */
	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",
};

const char *print_op(enum filter_op op)
{
	if (op >= NR_FILTER_OPS)
		return "UNKNOWN";
	else
		return opnames[op];
}

static
int apply_field_reloc(struct ltt_event *event,
		struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *field_name)
{
	const struct lttng_event_desc *desc;
	const struct lttng_event_field *fields, *field = NULL;
	unsigned int nr_fields, i;
	struct field_ref *field_ref;
	struct load_op *op;
	uint32_t field_offset = 0;

	dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name);

	/* Ensure that the reloc is within the code */
	if (runtime_len - reloc_offset < sizeof(uint16_t))
		return -EINVAL;

	/* Lookup event by name */
	desc = event->desc;
	if (!desc)
		return -EINVAL;
	fields = desc->fields;
	if (!fields)
		return -EINVAL;
	nr_fields = desc->nr_fields;
	for (i = 0; i < nr_fields; i++) {
		if (!strcmp(fields[i].name, field_name)) {
			field = &fields[i];
			break;
		}
		/* compute field offset */
		switch (fields[i].type.atype) {
		case atype_integer:
		case atype_enum:
			field_offset += sizeof(int64_t);
			break;
		case atype_array:
		case atype_sequence:
			field_offset += sizeof(unsigned long);
			field_offset += sizeof(void *);
			break;
		case atype_string:
			field_offset += sizeof(void *);
			break;
		case atype_float:
			field_offset += sizeof(double);
			break;
		default:
			return -EINVAL;
		}
	}
	if (!field)
		return -EINVAL;

	/* Check if field offset is too large for 16-bit offset */
	if (field_offset > FILTER_BYTECODE_MAX_LEN)
		return -EINVAL;

	/* set type */
	op = (struct load_op *) &runtime->data[reloc_offset];
	field_ref = (struct field_ref *) op->data;
	switch (field->type.atype) {
	case atype_integer:
	case atype_enum:
		op->op = FILTER_OP_LOAD_FIELD_REF_S64;
		break;
	case atype_array:
	case atype_sequence:
		op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
		break;
	case atype_string:
		op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
		break;
	case atype_float:
		op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
		break;
	default:
		return -EINVAL;
	}
	/* set offset */
	field_ref->offset = (uint16_t) field_offset;
	return 0;
}

/*
 * Take a bytecode with reloc table and link it to an event to create a
 * bytecode runtime.
 */
static
int _lttng_filter_event_link_bytecode(struct ltt_event *event,
		struct lttng_ust_filter_bytecode *filter_bytecode)
{
	int ret, offset, next_offset;
	struct bytecode_runtime *runtime = NULL;
	size_t runtime_alloc_len;

	if (!filter_bytecode)
		return 0;
	/* Even is not connected to any description */
	if (!event->desc)
		return 0;
	/* Bytecode already linked */
	if (event->filter || event->filter_data)
		return 0;

	dbg_printf("Linking\n");

	/* We don't need the reloc table in the runtime */
	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset;
	runtime = zmalloc(runtime_alloc_len);
	if (!runtime) {
		ret = -ENOMEM;
		goto link_error;
	}
	runtime->len = filter_bytecode->reloc_offset;
	/* copy original bytecode */
	memcpy(runtime->data, filter_bytecode->data, runtime->len);
	/*
	 * apply relocs. Those are a uint16_t (offset in bytecode)
	 * followed by a string (field name).
	 */
	for (offset = filter_bytecode->reloc_offset;
			offset < filter_bytecode->len;
			offset = next_offset) {
		uint16_t reloc_offset =
			*(uint16_t *) &filter_bytecode->data[offset];
		const char *field_name =
			(const char *) &filter_bytecode->data[offset + sizeof(uint16_t)];

		ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
		if (ret) {
			goto link_error;
		}
		next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1;
	}
	/* Validate bytecode */
	ret = lttng_filter_validate_bytecode(runtime);
	if (ret) {
		goto link_error;
	}
	/* Specialize bytecode */
	ret = lttng_filter_specialize_bytecode(runtime);
	if (ret) {
		goto link_error;
	}
	event->filter_data = runtime;
	event->filter = lttng_filter_interpret_bytecode;
	return 0;

link_error:
	event->filter = lttng_filter_false;
	free(runtime);
	return ret;
}

void lttng_filter_event_link_bytecode(struct ltt_event *event,
		struct lttng_ust_filter_bytecode *filter_bytecode)
{
	int ret;

	ret = _lttng_filter_event_link_bytecode(event, filter_bytecode);
	if (ret) {
		dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
	}
}

/*
 * Link bytecode to all events for a wildcard. Skips events that already
 * have a bytecode linked.
 * We do not set each event's filter_bytecode field, because they do not
 * own the filter_bytecode: the wildcard owns it.
 */
void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard)
{
	struct ltt_event *event;
	int ret;

	if (!wildcard->filter_bytecode)
		return;

	cds_list_for_each_entry(event, &wildcard->events, wildcard_list) {
		if (event->filter)
			continue;
		ret = _lttng_filter_event_link_bytecode(event,
				wildcard->filter_bytecode);
		if (ret) {
			fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n");
		}

	}
	return;
}

/*
 * Need to attach filter to an event before starting tracing for the
 * session. We own the filter_bytecode if we return success.
 */
int lttng_filter_event_attach_bytecode(struct ltt_event *event,
		struct lttng_ust_filter_bytecode *filter_bytecode)
{
	if (event->chan->session->been_active)
		return -EPERM;
	if (event->filter_bytecode)
		return -EEXIST;
	event->filter_bytecode = filter_bytecode;
	return 0;
}

/*
 * Need to attach filter to a wildcard before starting tracing for the
 * session. We own the filter_bytecode if we return success.
 */
int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard,
		struct lttng_ust_filter_bytecode *filter_bytecode)
{
	if (wildcard->chan->session->been_active)
		return -EPERM;
	if (wildcard->filter_bytecode)
		return -EEXIST;
	wildcard->filter_bytecode = filter_bytecode;
	return 0;
}
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
97b58163	23	#include "lttng-filter.h"
cd54f6d9 MD	24
	25	static const char *opnames[] = {
	26	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",
	27
	28	[ FILTER_OP_RETURN ] = "RETURN",
	29
	30	/* binary */
	31	[ FILTER_OP_MUL ] = "MUL",
	32	[ FILTER_OP_DIV ] = "DIV",
	33	[ FILTER_OP_MOD ] = "MOD",
	34	[ FILTER_OP_PLUS ] = "PLUS",
	35	[ FILTER_OP_MINUS ] = "MINUS",
	36	[ FILTER_OP_RSHIFT ] = "RSHIFT",
	37	[ FILTER_OP_LSHIFT ] = "LSHIFT",
	38	[ FILTER_OP_BIN_AND ] = "BIN_AND",
	39	[ FILTER_OP_BIN_OR ] = "BIN_OR",
	40	[ FILTER_OP_BIN_XOR ] = "BIN_XOR",
226106c0 MD	41
226106c0 MD	42	/* binary comparators */
cd54f6d9 MD	43	[ FILTER_OP_EQ ] = "EQ",
	44	[ FILTER_OP_NE ] = "NE",
	45	[ FILTER_OP_GT ] = "GT",
	46	[ FILTER_OP_LT ] = "LT",
	47	[ FILTER_OP_GE ] = "GE",
	48	[ FILTER_OP_LE ] = "LE",
	49
226106c0 MD	50	/* string binary comparators */
	51	[ FILTER_OP_EQ_STRING ] = "EQ_STRING",
	52	[ FILTER_OP_NE_STRING ] = "NE_STRING",
	53	[ FILTER_OP_GT_STRING ] = "GT_STRING",
	54	[ FILTER_OP_LT_STRING ] = "LT_STRING",
	55	[ FILTER_OP_GE_STRING ] = "GE_STRING",
	56	[ FILTER_OP_LE_STRING ] = "LE_STRING",
	57
	58	/* s64 binary comparators */
	59	[ FILTER_OP_EQ_S64 ] = "EQ_S64",
	60	[ FILTER_OP_NE_S64 ] = "NE_S64",
	61	[ FILTER_OP_GT_S64 ] = "GT_S64",
	62	[ FILTER_OP_LT_S64 ] = "LT_S64",
	63	[ FILTER_OP_GE_S64 ] = "GE_S64",
	64	[ FILTER_OP_LE_S64 ] = "LE_S64",
	65
	66	/* double binary comparators */
	67	[ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
	68	[ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
	69	[ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
	70	[ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
	71	[ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
	72	[ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",
	73
1e5f62b4 MD	74	/* Mixed S64-double binary comparators */
	75	[ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64",
	76	[ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64",
	77	[ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64",
	78	[ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64",
	79	[ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64",
	80	[ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64",
	81
	82	[ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE",
	83	[ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE",
	84	[ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE",
	85	[ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE",
	86	[ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE",
	87	[ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE",
226106c0	88
cd54f6d9 MD	89	/* unary */
	90	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	91	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	92	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
226106c0 MD	93	[ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
	94	[ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
	95	[ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
	96	[ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
	97	[ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
	98	[ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",
cd54f6d9 MD	99
	100	/* logical */
	101	[ FILTER_OP_AND ] = "AND",
	102	[ FILTER_OP_OR ] = "OR",
	103
	104	/* load */
	105	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
2f0145d1 MD	106	[ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
	107	[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
	108	[ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
	109	[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",
	110
cd54f6d9 MD	111	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
cd54f6d9 MD	112	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
da6eed25	113	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
49905038 MD	114
	115	/* cast */
	116	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
	117	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
	118	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",
cd54f6d9 MD	119	};
cd54f6d9 MD	120
cd54f6d9 MD	121	const char *print_op(enum filter_op op)
	122	{
	123	if (op >= NR_FILTER_OPS)
	124	return "UNKNOWN";
	125	else
	126	return opnames[op];
	127	}
	128
cd54f6d9 MD	129	static
	130	int apply_field_reloc(struct ltt_event *event,
	131	struct bytecode_runtime *runtime,
	132	uint32_t runtime_len,
	133	uint32_t reloc_offset,
	134	const char *field_name)
	135	{
	136	const struct lttng_event_desc *desc;
	137	const struct lttng_event_field fields, field = NULL;
	138	unsigned int nr_fields, i;
	139	struct field_ref *field_ref;
2f0145d1	140	struct load_op *op;
cd54f6d9 MD	141	uint32_t field_offset = 0;
cd54f6d9 MD	142
a8c27c7c	143	dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name);
cd54f6d9 MD	144
	145	/* Ensure that the reloc is within the code */
	146	if (runtime_len - reloc_offset < sizeof(uint16_t))
	147	return -EINVAL;
	148
	149	/* Lookup event by name */
	150	desc = event->desc;
	151	if (!desc)
	152	return -EINVAL;
	153	fields = desc->fields;
	154	if (!fields)
	155	return -EINVAL;
	156	nr_fields = desc->nr_fields;
	157	for (i = 0; i < nr_fields; i++) {
	158	if (!strcmp(fields[i].name, field_name)) {
	159	field = &fields[i];
	160	break;
	161	}
	162	/* compute field offset */
	163	switch (fields[i].type.atype) {
	164	case atype_integer:
	165	case atype_enum:
	166	field_offset += sizeof(int64_t);
	167	break;
	168	case atype_array:
	169	case atype_sequence:
	170	field_offset += sizeof(unsigned long);
	171	field_offset += sizeof(void *);
	172	break;
	173	case atype_string:
	174	field_offset += sizeof(void *);
	175	break;
	176	case atype_float:
	177	field_offset += sizeof(double);
da6eed25	178	break;
cd54f6d9 MD	179	default:
	180	return -EINVAL;
	181	}
	182	}
	183	if (!field)
	184	return -EINVAL;
	185
	186	/* Check if field offset is too large for 16-bit offset */
	187	if (field_offset > FILTER_BYTECODE_MAX_LEN)
	188	return -EINVAL;
	189
	190	/* set type */
2f0145d1 MD	191	op = (struct load_op *) &runtime->data[reloc_offset];
2f0145d1 MD	192	field_ref = (struct field_ref *) op->data;
cd54f6d9 MD	193	switch (field->type.atype) {
	194	case atype_integer:
	195	case atype_enum:
2f0145d1	196	op->op = FILTER_OP_LOAD_FIELD_REF_S64;
cd54f6d9 MD	197	break;
	198	case atype_array:
	199	case atype_sequence:
2f0145d1	200	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
cd54f6d9 MD	201	break;
cd54f6d9 MD	202	case atype_string:
2f0145d1	203	op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
cd54f6d9 MD	204	break;
cd54f6d9 MD	205	case atype_float:
2f0145d1	206	op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
da6eed25	207	break;
cd54f6d9 MD	208	default:
	209	return -EINVAL;
	210	}
	211	/* set offset */
	212	field_ref->offset = (uint16_t) field_offset;
2d78951a MD	213	return 0;
	214	}
	215
cd54f6d9 MD	216	/*
	217	* Take a bytecode with reloc table and link it to an event to create a
	218	* bytecode runtime.
	219	*/
2d78951a MD	220	static
	221	int _lttng_filter_event_link_bytecode(struct ltt_event *event,
	222	struct lttng_ust_filter_bytecode *filter_bytecode)
	223	{
cd54f6d9 MD	224	int ret, offset, next_offset;
	225	struct bytecode_runtime *runtime = NULL;
	226	size_t runtime_alloc_len;
	227
2d78951a MD	228	if (!filter_bytecode)
2d78951a MD	229	return 0;
cd54f6d9 MD	230	/* Even is not connected to any description */
	231	if (!event->desc)
	232	return 0;
	233	/* Bytecode already linked */
	234	if (event->filter \|\| event->filter_data)
	235	return 0;
2d78951a	236
a8c27c7c	237	dbg_printf("Linking\n");
cd54f6d9 MD	238
	239	/* We don't need the reloc table in the runtime */
	240	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset;
	241	runtime = zmalloc(runtime_alloc_len);
	242	if (!runtime) {
	243	ret = -ENOMEM;
	244	goto link_error;
	245	}
	246	runtime->len = filter_bytecode->reloc_offset;
	247	/* copy original bytecode */
	248	memcpy(runtime->data, filter_bytecode->data, runtime->len);
	249	/*
	250	* apply relocs. Those are a uint16_t (offset in bytecode)
	251	* followed by a string (field name).
	252	*/
cd54f6d9 MD	253	for (offset = filter_bytecode->reloc_offset;
	254	offset < filter_bytecode->len;
	255	offset = next_offset) {
	256	uint16_t reloc_offset =
	257	(uint16_t ) &filter_bytecode->data[offset];
	258	const char *field_name =
	259	(const char *) &filter_bytecode->data[offset + sizeof(uint16_t)];
	260
	261	ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
	262	if (ret) {
	263	goto link_error;
	264	}
	265	next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1;
	266	}
9522a886 MD	267	/* Validate bytecode */
	268	ret = lttng_filter_validate_bytecode(runtime);
	269	if (ret) {
	270	goto link_error;
	271	}
08c84b15 MD	272	/* Specialize bytecode */
	273	ret = lttng_filter_specialize_bytecode(runtime);
	274	if (ret) {
	275	goto link_error;
	276	}
cd54f6d9	277	event->filter_data = runtime;
2d78951a	278	event->filter = lttng_filter_interpret_bytecode;
2d78951a	279	return 0;
cd54f6d9 MD	280
	281	link_error:
	282	event->filter = lttng_filter_false;
	283	free(runtime);
	284	return ret;
2d78951a MD	285	}
	286
	287	void lttng_filter_event_link_bytecode(struct ltt_event *event,
	288	struct lttng_ust_filter_bytecode *filter_bytecode)
	289	{
	290	int ret;
	291
cd54f6d9	292	ret = _lttng_filter_event_link_bytecode(event, filter_bytecode);
2d78951a	293	if (ret) {
0cbbe1f9	294	dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
2d78951a MD	295	}
	296	}
	297
	298	/*
	299	* Link bytecode to all events for a wildcard. Skips events that already
	300	* have a bytecode linked.
	301	* We do not set each event's filter_bytecode field, because they do not
	302	* own the filter_bytecode: the wildcard owns it.
	303	*/
	304	void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard)
	305	{
	306	struct ltt_event *event;
	307	int ret;
	308
	309	if (!wildcard->filter_bytecode)
	310	return;
	311
	312	cds_list_for_each_entry(event, &wildcard->events, wildcard_list) {
	313	if (event->filter)
	314	continue;
	315	ret = _lttng_filter_event_link_bytecode(event,
	316	wildcard->filter_bytecode);
	317	if (ret) {
	318	fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n");
	319	}
	320
	321	}
	322	return;
	323	}
	324
	325	/*
	326	* Need to attach filter to an event before starting tracing for the
cd54f6d9	327	* session. We own the filter_bytecode if we return success.
2d78951a MD	328	*/
	329	int lttng_filter_event_attach_bytecode(struct ltt_event *event,
	330	struct lttng_ust_filter_bytecode *filter_bytecode)
	331	{
2d78951a MD	332	if (event->chan->session->been_active)
	333	return -EPERM;
	334	if (event->filter_bytecode)
	335	return -EEXIST;
cd54f6d9	336	event->filter_bytecode = filter_bytecode;
2d78951a MD	337	return 0;
	338	}
	339
	340	/*
	341	* Need to attach filter to a wildcard before starting tracing for the
cd54f6d9	342	* session. We own the filter_bytecode if we return success.
2d78951a MD	343	*/
	344	int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard,
	345	struct lttng_ust_filter_bytecode *filter_bytecode)
	346	{
2d78951a MD	347	if (wildcard->chan->session->been_active)
	348	return -EPERM;
	349	if (wildcard->filter_bytecode)
	350	return -EEXIST;
cd54f6d9	351	wildcard->filter_bytecode = filter_bytecode;
2d78951a MD	352	return 0;
2d78951a MD	353	}