[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 <urcu/rculist.h>
#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 lttng_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 - 1)
		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;
}

static
int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
		struct lttng_event *event)
{
	struct lttng_bytecode_runtime *bc_runtime;

	cds_list_for_each_entry(bc_runtime,
			&event->bytecode_runtime_head, node) {
		if (bc_runtime->bc == filter_bytecode)
			return 1;
	}
	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 lttng_event *event,
		struct lttng_ust_filter_bytecode_node *filter_bytecode,
		struct cds_list_head *insert_loc)
{
	int ret, offset, next_offset;
	struct bytecode_runtime *runtime = NULL;
	size_t runtime_alloc_len;

	if (!filter_bytecode)
		return 0;
	/* Bytecode already linked */
	if (bytecode_is_linked(filter_bytecode, event))
		return 0;

	dbg_printf("Linking...\n");

	/* We don't need the reloc table in the runtime */
	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
	runtime = zmalloc(runtime_alloc_len);
	if (!runtime) {
		ret = -ENOMEM;
		goto link_error;
	}
	runtime->p.bc = filter_bytecode;
	runtime->len = filter_bytecode->bc.reloc_offset;
	/* copy original bytecode */
	memcpy(runtime->data, filter_bytecode->bc.data, runtime->len);
	/*
	 * apply relocs. Those are a uint16_t (offset in bytecode)
	 * followed by a string (field name).
	 */
	for (offset = filter_bytecode->bc.reloc_offset;
			offset < filter_bytecode->bc.len;
			offset = next_offset) {
		uint16_t reloc_offset =
			*(uint16_t *) &filter_bytecode->bc.data[offset];
		const char *field_name =
			(const char *) &filter_bytecode->bc.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;
	}
	runtime->p.filter = lttng_filter_interpret_bytecode;
	cds_list_add_rcu(&runtime->p.node, insert_loc);
	dbg_printf("Linking successful.\n");
	return 0;

link_error:
	runtime->p.filter = lttng_filter_false;
	cds_list_add_rcu(&runtime->p.node, insert_loc);
	dbg_printf("Linking failed.\n");
	return ret;
}

void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
{
	struct lttng_ust_filter_bytecode_node *bc = runtime->bc;

	if (bc->enabler->enabled)
		runtime->filter = lttng_filter_interpret_bytecode;
	else
		runtime->filter = lttng_filter_false;
}

/*
 * Link bytecode for all enablers referenced by an event.
 */
void lttng_enabler_event_link_bytecode(struct lttng_event *event,
		struct lttng_enabler *enabler)
{
	struct lttng_ust_filter_bytecode_node *bc;
	struct lttng_bytecode_runtime *runtime;

	/* Can only be called for events with desc attached */
	assert(event->desc);

	/* Link each bytecode. */
	cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
		int found = 0, ret;
		struct cds_list_head *insert_loc;

		cds_list_for_each_entry(runtime,
				&event->bytecode_runtime_head, node) {
			if (runtime->bc == bc) {
				found = 1;
				break;
			}
		}
		/* Skip bytecode already linked */
		if (found)
			continue;

		/*
		 * Insert at specified priority (seqnum) in increasing
		 * order.
		 */
		cds_list_for_each_entry_reverse(runtime,
				&event->bytecode_runtime_head, node) {
			if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
				/* insert here */
				insert_loc = &runtime->node;
				goto add_within;
			}
		}
		/* Add to head to list */
		insert_loc = &event->bytecode_runtime_head;
	add_within:
		dbg_printf("linking bytecode\n");
		ret = _lttng_filter_event_link_bytecode(event, bc,
				insert_loc);
		if (ret) {
			dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
		}
	}
}

/*
 * We own the filter_bytecode if we return success.
 */
int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
		struct lttng_ust_filter_bytecode_node *filter_bytecode)
{
	cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
	return 0;
}

void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
{
	struct lttng_ust_filter_bytecode_node *filter_bytecode, *tmp;

	cds_list_for_each_entry_safe(filter_bytecode, tmp,
			&enabler->filter_bytecode_head, node) {
		free(filter_bytecode);
	}
}

void lttng_free_event_filter_runtime(struct lttng_event *event)
{
	struct bytecode_runtime *runtime, *tmp;

	cds_list_for_each_entry_safe(runtime, tmp,
			&event->bytecode_runtime_head, p.node) {
		free(runtime);
	}
}
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
f488575f	23	#include <urcu/rculist.h>
97b58163	24	#include "lttng-filter.h"
cd54f6d9 MD	25
	26	static const char *opnames[] = {
	27	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",
	28
	29	[ FILTER_OP_RETURN ] = "RETURN",
	30
	31	/* binary */
	32	[ FILTER_OP_MUL ] = "MUL",
	33	[ FILTER_OP_DIV ] = "DIV",
	34	[ FILTER_OP_MOD ] = "MOD",
	35	[ FILTER_OP_PLUS ] = "PLUS",
	36	[ FILTER_OP_MINUS ] = "MINUS",
	37	[ FILTER_OP_RSHIFT ] = "RSHIFT",
	38	[ FILTER_OP_LSHIFT ] = "LSHIFT",
	39	[ FILTER_OP_BIN_AND ] = "BIN_AND",
	40	[ FILTER_OP_BIN_OR ] = "BIN_OR",
	41	[ FILTER_OP_BIN_XOR ] = "BIN_XOR",
226106c0 MD	42
226106c0 MD	43	/* binary comparators */
cd54f6d9 MD	44	[ FILTER_OP_EQ ] = "EQ",
	45	[ FILTER_OP_NE ] = "NE",
	46	[ FILTER_OP_GT ] = "GT",
	47	[ FILTER_OP_LT ] = "LT",
	48	[ FILTER_OP_GE ] = "GE",
	49	[ FILTER_OP_LE ] = "LE",
	50
226106c0 MD	51	/* string binary comparators */
	52	[ FILTER_OP_EQ_STRING ] = "EQ_STRING",
	53	[ FILTER_OP_NE_STRING ] = "NE_STRING",
	54	[ FILTER_OP_GT_STRING ] = "GT_STRING",
	55	[ FILTER_OP_LT_STRING ] = "LT_STRING",
	56	[ FILTER_OP_GE_STRING ] = "GE_STRING",
	57	[ FILTER_OP_LE_STRING ] = "LE_STRING",
	58
	59	/* s64 binary comparators */
	60	[ FILTER_OP_EQ_S64 ] = "EQ_S64",
	61	[ FILTER_OP_NE_S64 ] = "NE_S64",
	62	[ FILTER_OP_GT_S64 ] = "GT_S64",
	63	[ FILTER_OP_LT_S64 ] = "LT_S64",
	64	[ FILTER_OP_GE_S64 ] = "GE_S64",
	65	[ FILTER_OP_LE_S64 ] = "LE_S64",
	66
	67	/* double binary comparators */
	68	[ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
	69	[ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
	70	[ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
	71	[ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
	72	[ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
	73	[ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",
	74
1e5f62b4 MD	75	/* Mixed S64-double binary comparators */
	76	[ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64",
	77	[ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64",
	78	[ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64",
	79	[ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64",
	80	[ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64",
	81	[ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64",
	82
	83	[ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE",
	84	[ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE",
	85	[ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE",
	86	[ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE",
	87	[ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE",
	88	[ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE",
226106c0	89
cd54f6d9 MD	90	/* unary */
	91	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	92	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	93	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
226106c0 MD	94	[ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
	95	[ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
	96	[ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
	97	[ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
	98	[ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
	99	[ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",
cd54f6d9 MD	100
	101	/* logical */
	102	[ FILTER_OP_AND ] = "AND",
	103	[ FILTER_OP_OR ] = "OR",
	104
	105	/* load */
	106	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
2f0145d1 MD	107	[ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
	108	[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
	109	[ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
	110	[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",
	111
cd54f6d9 MD	112	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
cd54f6d9 MD	113	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
da6eed25	114	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
49905038 MD	115
	116	/* cast */
	117	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
	118	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
	119	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",
cd54f6d9 MD	120	};
cd54f6d9 MD	121
cd54f6d9 MD	122	const char *print_op(enum filter_op op)
	123	{
	124	if (op >= NR_FILTER_OPS)
	125	return "UNKNOWN";
	126	else
	127	return opnames[op];
	128	}
	129
cd54f6d9	130	static
7dd08bec	131	int apply_field_reloc(struct lttng_event *event,
cd54f6d9 MD	132	struct bytecode_runtime *runtime,
	133	uint32_t runtime_len,
	134	uint32_t reloc_offset,
	135	const char *field_name)
	136	{
	137	const struct lttng_event_desc *desc;
	138	const struct lttng_event_field fields, field = NULL;
	139	unsigned int nr_fields, i;
	140	struct field_ref *field_ref;
2f0145d1	141	struct load_op *op;
cd54f6d9 MD	142	uint32_t field_offset = 0;
cd54f6d9 MD	143
a8c27c7c	144	dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name);
cd54f6d9 MD	145
	146	/* Ensure that the reloc is within the code */
	147	if (runtime_len - reloc_offset < sizeof(uint16_t))
	148	return -EINVAL;
	149
	150	/* Lookup event by name */
	151	desc = event->desc;
	152	if (!desc)
	153	return -EINVAL;
	154	fields = desc->fields;
	155	if (!fields)
	156	return -EINVAL;
	157	nr_fields = desc->nr_fields;
	158	for (i = 0; i < nr_fields; i++) {
	159	if (!strcmp(fields[i].name, field_name)) {
	160	field = &fields[i];
	161	break;
	162	}
	163	/* compute field offset */
	164	switch (fields[i].type.atype) {
	165	case atype_integer:
	166	case atype_enum:
	167	field_offset += sizeof(int64_t);
	168	break;
	169	case atype_array:
	170	case atype_sequence:
	171	field_offset += sizeof(unsigned long);
	172	field_offset += sizeof(void *);
	173	break;
	174	case atype_string:
	175	field_offset += sizeof(void *);
	176	break;
	177	case atype_float:
	178	field_offset += sizeof(double);
da6eed25	179	break;
cd54f6d9 MD	180	default:
	181	return -EINVAL;
	182	}
	183	}
	184	if (!field)
	185	return -EINVAL;
	186
	187	/* Check if field offset is too large for 16-bit offset */
5b4839a8	188	if (field_offset > FILTER_BYTECODE_MAX_LEN - 1)
cd54f6d9 MD	189	return -EINVAL;
	190
	191	/* set type */
2f0145d1 MD	192	op = (struct load_op *) &runtime->data[reloc_offset];
2f0145d1 MD	193	field_ref = (struct field_ref *) op->data;
cd54f6d9 MD	194	switch (field->type.atype) {
	195	case atype_integer:
	196	case atype_enum:
2f0145d1	197	op->op = FILTER_OP_LOAD_FIELD_REF_S64;
cd54f6d9 MD	198	break;
	199	case atype_array:
	200	case atype_sequence:
2f0145d1	201	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
cd54f6d9 MD	202	break;
cd54f6d9 MD	203	case atype_string:
2f0145d1	204	op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
cd54f6d9 MD	205	break;
cd54f6d9 MD	206	case atype_float:
2f0145d1	207	op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
da6eed25	208	break;
cd54f6d9 MD	209	default:
	210	return -EINVAL;
	211	}
	212	/* set offset */
	213	field_ref->offset = (uint16_t) field_offset;
2d78951a MD	214	return 0;
	215	}
	216
f488575f MD	217	static
f488575f MD	218	int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
7dd08bec	219	struct lttng_event *event)
f488575f MD	220	{
	221	struct lttng_bytecode_runtime *bc_runtime;
	222
e58095ef MD	223	cds_list_for_each_entry(bc_runtime,
e58095ef MD	224	&event->bytecode_runtime_head, node) {
f488575f MD	225	if (bc_runtime->bc == filter_bytecode)
	226	return 1;
	227	}
	228	return 0;
	229	}
	230
cd54f6d9 MD	231	/*
	232	* Take a bytecode with reloc table and link it to an event to create a
	233	* bytecode runtime.
	234	*/
2d78951a	235	static
7dd08bec	236	int _lttng_filter_event_link_bytecode(struct lttng_event *event,
e58095ef MD	237	struct lttng_ust_filter_bytecode_node *filter_bytecode,
e58095ef MD	238	struct cds_list_head *insert_loc)
2d78951a	239	{
cd54f6d9 MD	240	int ret, offset, next_offset;
	241	struct bytecode_runtime *runtime = NULL;
	242	size_t runtime_alloc_len;
	243
2d78951a MD	244	if (!filter_bytecode)
2d78951a MD	245	return 0;
cd54f6d9	246	/* Bytecode already linked */
f488575f	247	if (bytecode_is_linked(filter_bytecode, event))
cd54f6d9	248	return 0;
2d78951a	249
f488575f	250	dbg_printf("Linking...\n");
cd54f6d9 MD	251
cd54f6d9 MD	252	/* We don't need the reloc table in the runtime */
f488575f	253	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
cd54f6d9 MD	254	runtime = zmalloc(runtime_alloc_len);
	255	if (!runtime) {
	256	ret = -ENOMEM;
	257	goto link_error;
	258	}
f488575f MD	259	runtime->p.bc = filter_bytecode;
f488575f MD	260	runtime->len = filter_bytecode->bc.reloc_offset;
cd54f6d9	261	/* copy original bytecode */
f488575f	262	memcpy(runtime->data, filter_bytecode->bc.data, runtime->len);
cd54f6d9 MD	263	/*
	264	* apply relocs. Those are a uint16_t (offset in bytecode)
	265	* followed by a string (field name).
	266	*/
f488575f MD	267	for (offset = filter_bytecode->bc.reloc_offset;
f488575f MD	268	offset < filter_bytecode->bc.len;
cd54f6d9 MD	269	offset = next_offset) {
cd54f6d9 MD	270	uint16_t reloc_offset =
f488575f	271	(uint16_t ) &filter_bytecode->bc.data[offset];
cd54f6d9	272	const char *field_name =
f488575f	273	(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];
cd54f6d9 MD	274
	275	ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
	276	if (ret) {
	277	goto link_error;
	278	}
	279	next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1;
	280	}
9522a886 MD	281	/* Validate bytecode */
	282	ret = lttng_filter_validate_bytecode(runtime);
	283	if (ret) {
	284	goto link_error;
	285	}
08c84b15 MD	286	/* Specialize bytecode */
	287	ret = lttng_filter_specialize_bytecode(runtime);
	288	if (ret) {
	289	goto link_error;
	290	}
f488575f	291	runtime->p.filter = lttng_filter_interpret_bytecode;
e58095ef	292	cds_list_add_rcu(&runtime->p.node, insert_loc);
f488575f	293	dbg_printf("Linking successful.\n");
2d78951a	294	return 0;
cd54f6d9 MD	295
cd54f6d9 MD	296	link_error:
f488575f	297	runtime->p.filter = lttng_filter_false;
e58095ef	298	cds_list_add_rcu(&runtime->p.node, insert_loc);
f488575f	299	dbg_printf("Linking failed.\n");
cd54f6d9	300	return ret;
2d78951a MD	301	}
2d78951a MD	302
e58095ef	303	void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
2d78951a	304	{
e58095ef	305	struct lttng_ust_filter_bytecode_node *bc = runtime->bc;
f488575f	306
e58095ef MD	307	if (bc->enabler->enabled)
	308	runtime->filter = lttng_filter_interpret_bytecode;
	309	else
	310	runtime->filter = lttng_filter_false;
2d78951a MD	311	}
	312
	313	/*
e58095ef	314	* Link bytecode for all enablers referenced by an event.
2d78951a	315	*/
e58095ef MD	316	void lttng_enabler_event_link_bytecode(struct lttng_event *event,
e58095ef MD	317	struct lttng_enabler *enabler)
2d78951a	318	{
e58095ef MD	319	struct lttng_ust_filter_bytecode_node *bc;
	320	struct lttng_bytecode_runtime *runtime;
	321
	322	/* Can only be called for events with desc attached */
	323	assert(event->desc);
	324
	325	/* Link each bytecode. */
	326	cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
	327	int found = 0, ret;
	328	struct cds_list_head *insert_loc;
	329
	330	cds_list_for_each_entry(runtime,
	331	&event->bytecode_runtime_head, node) {
	332	if (runtime->bc == bc) {
	333	found = 1;
	334	break;
	335	}
	336	}
	337	/* Skip bytecode already linked */
	338	if (found)
	339	continue;
	340
	341	/*
	342	* Insert at specified priority (seqnum) in increasing
	343	* order.
	344	*/
	345	cds_list_for_each_entry_reverse(runtime,
	346	&event->bytecode_runtime_head, node) {
	347	if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
	348	/* insert here */
	349	insert_loc = &runtime->node;
	350	goto add_within;
	351	}
	352	}
	353	/* Add to head to list */
	354	insert_loc = &event->bytecode_runtime_head;
	355	add_within:
f488575f	356	dbg_printf("linking bytecode\n");
e58095ef MD	357	ret = _lttng_filter_event_link_bytecode(event, bc,
	358	insert_loc);
	359	if (ret) {
	360	dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
	361	}
2d78951a	362	}
2d78951a MD	363	}
	364
	365	/*
e58095ef	366	* We own the filter_bytecode if we return success.
2d78951a	367	*/
e58095ef	368	int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
f488575f	369	struct lttng_ust_filter_bytecode_node *filter_bytecode)
2d78951a	370	{
e58095ef	371	cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
2d78951a MD	372	return 0;
2d78951a MD	373	}
f488575f	374
e58095ef	375	void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
f488575f MD	376	{
	377	struct lttng_ust_filter_bytecode_node filter_bytecode, tmp;
	378
	379	cds_list_for_each_entry_safe(filter_bytecode, tmp,
e58095ef	380	&enabler->filter_bytecode_head, node) {
f488575f MD	381	free(filter_bytecode);
	382	}
	383	}
	384
7dd08bec	385	void lttng_free_event_filter_runtime(struct lttng_event *event)
f488575f MD	386	{
	387	struct bytecode_runtime runtime, tmp;
	388
	389	cds_list_for_each_entry_safe(runtime, tmp,
e58095ef	390	&event->bytecode_runtime_head, p.node) {
f488575f MD	391	free(runtime);
	392	}
	393	}