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

/*
 * lttng-filter.c
 *
 * LTTng UST filter code.
 *
 * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#define _LGPL_SOURCE
#include <stddef.h>
#include <stdint.h>

#include <urcu/rculist.h>

#include "lttng-filter.h"
#include "ust-events-internal.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_BIT_RSHIFT ] = "BIT_RSHIFT",
	[ FILTER_OP_BIT_LSHIFT ] = "BIT_LSHIFT",
	[ FILTER_OP_BIT_AND ] = "BIT_AND",
	[ FILTER_OP_BIT_OR ] = "BIT_OR",
	[ FILTER_OP_BIT_XOR ] = "BIT_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 field ref */
	[ 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",

	/* load from immediate operand */
	[ 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",

	/* get context ref */
	[ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF",
	[ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING",
	[ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64",
	[ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE",

	/* load userspace field ref */
	[ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING",
	[ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE",

	/*
	 * load immediate star globbing pattern (literal string)
	 * from immediate.
	 */
	[ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING",

	/* globbing pattern binary operator: apply to */
	[ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING",
	[ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING",

	/*
	 * Instructions for recursive traversal through composed types.
	 */
	[ FILTER_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT",
	[ FILTER_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT",
	[ FILTER_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT",

	[ FILTER_OP_GET_SYMBOL ] = "GET_SYMBOL",
	[ FILTER_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD",
	[ FILTER_OP_GET_INDEX_U16 ] = "GET_INDEX_U16",
	[ FILTER_OP_GET_INDEX_U64 ] = "GET_INDEX_U64",

	[ FILTER_OP_LOAD_FIELD ] = "LOAD_FIELD",
	[ FILTER_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8",
	[ FILTER_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16",
	[ FILTER_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32",
	[ FILTER_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64",
	[ FILTER_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8",
	[ FILTER_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16",
	[ FILTER_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32",
	[ FILTER_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64",
	[ FILTER_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING",
	[ FILTER_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE",
	[ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE",

	[ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT",

	[ FILTER_OP_RETURN_S64 ] = "RETURN_S64",
};

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

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

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

	/* Lookup event by name */
	if (!event_desc)
		return -EINVAL;
	fields = event_desc->fields;
	if (!fields)
		return -EINVAL;
	nr_fields = event_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->code[reloc_offset];

	switch (filter_op) {
	case FILTER_OP_LOAD_FIELD_REF:
	{
		struct field_ref *field_ref;

		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;
		break;
	}
	default:
		return -EINVAL;
	}
	return 0;
}

static
int apply_context_reloc(struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *context_name,
		enum filter_op filter_op)
{
	struct load_op *op;
	struct lttng_ctx_field *ctx_field;
	int idx;
	struct lttng_ctx *ctx = *runtime->p.ctx;

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

	/* Get context index */
	idx = lttng_get_context_index(ctx, context_name);
	if (idx < 0) {
		if (lttng_context_is_app(context_name)) {
			int ret;

			ret = lttng_ust_add_app_context_to_ctx_rcu(context_name,
					&ctx);
			if (ret)
				return ret;
			idx = lttng_get_context_index(ctx, context_name);
			if (idx < 0)
				return -ENOENT;
		} else {
			return -ENOENT;
		}
	}
	/* Check if idx is too large for 16-bit offset */
	if (idx > FILTER_BYTECODE_MAX_LEN - 1)
		return -EINVAL;

	/* Get context return type */
	ctx_field = &ctx->fields[idx];
	op = (struct load_op *) &runtime->code[reloc_offset];

	switch (filter_op) {
	case FILTER_OP_GET_CONTEXT_REF:
	{
		struct field_ref *field_ref;

		field_ref = (struct field_ref *) op->data;
		switch (ctx_field->event_field.type.atype) {
		case atype_integer:
		case atype_enum:
			op->op = FILTER_OP_GET_CONTEXT_REF_S64;
			break;
			/* Sequence and array supported as string */
		case atype_string:
		case atype_array:
		case atype_sequence:
			op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
			break;
		case atype_float:
			op->op = FILTER_OP_GET_CONTEXT_REF_DOUBLE;
			break;
		case atype_dynamic:
			op->op = FILTER_OP_GET_CONTEXT_REF;
			break;
		default:
			return -EINVAL;
		}
		/* set offset to context index within channel contexts */
		field_ref->offset = (uint16_t) idx;
		break;
	}
	default:
		return -EINVAL;
	}
	return 0;
}

static
int apply_reloc(const struct lttng_event_desc *event_desc,
		struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *name)
{
	struct load_op *op;

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

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

	op = (struct load_op *) &runtime->code[reloc_offset];
	switch (op->op) {
	case FILTER_OP_LOAD_FIELD_REF:
		return apply_field_reloc(event_desc, runtime, runtime_len,
			reloc_offset, name, op->op);
	case FILTER_OP_GET_CONTEXT_REF:
		return apply_context_reloc(runtime, runtime_len,
			reloc_offset, name, op->op);
	case FILTER_OP_GET_SYMBOL:
	case FILTER_OP_GET_SYMBOL_FIELD:
		/*
		 * Will be handled by load specialize phase or
		 * dynamically by interpreter.
		 */
		return 0;
	default:
		ERR("Unknown reloc op type %u\n", op->op);
		return -EINVAL;
	}
	return 0;
}

static
int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
		struct cds_list_head *bytecode_runtime_head)
{
	struct lttng_bytecode_runtime *bc_runtime;

	cds_list_for_each_entry(bc_runtime, 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_link_bytecode(const struct lttng_event_desc *event_desc,
		struct lttng_ctx **ctx,
		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, insert_loc))
		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 alloc_error;
	}
	runtime->p.bc = filter_bytecode;
	runtime->p.ctx = ctx;
	runtime->len = filter_bytecode->bc.reloc_offset;
	/* copy original bytecode */
	memcpy(runtime->code, 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 *name =
			(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];

		ret = apply_reloc(event_desc, runtime, runtime->len, reloc_offset, name);
		if (ret) {
			goto link_error;
		}
		next_offset = offset + sizeof(uint16_t) + strlen(name) + 1;
	}
	/* Validate bytecode */
	ret = lttng_filter_validate_bytecode(runtime);
	if (ret) {
		goto link_error;
	}
	/* Specialize bytecode */
	ret = lttng_filter_specialize_bytecode(event_desc, runtime);
	if (ret) {
		goto link_error;
	}
	runtime->p.filter = lttng_filter_interpret_bytecode;
	runtime->p.link_failed = 0;
	cds_list_add_rcu(&runtime->p.node, insert_loc);
	dbg_printf("Linking successful.\n");
	return 0;

link_error:
	runtime->p.filter = lttng_filter_false;
	runtime->p.link_failed = 1;
	cds_list_add_rcu(&runtime->p.node, insert_loc);
alloc_error:
	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->link_failed)
		runtime->filter = lttng_filter_false;
	else
		runtime->filter = lttng_filter_interpret_bytecode;
}

/*
 * Link bytecode for all enablers referenced by an event.
 */
void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
		struct lttng_ctx **ctx,
		struct cds_list_head *bytecode_runtime_head,
		struct lttng_enabler *enabler)
{
	struct lttng_ust_filter_bytecode_node *bc;
	struct lttng_bytecode_runtime *runtime;

	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,
				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,
				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 = bytecode_runtime_head;
	add_within:
		dbg_printf("linking bytecode\n");
		ret = _lttng_filter_link_bytecode(event_desc, ctx, 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;
}

static
void free_filter_runtime(struct cds_list_head *bytecode_runtime_head)
{
	struct bytecode_runtime *runtime, *tmp;

	cds_list_for_each_entry_safe(runtime, tmp, bytecode_runtime_head,
			p.node) {
		free(runtime->data);
		free(runtime);
	}
}

void lttng_free_event_filter_runtime(struct lttng_event *event)
{
	free_filter_runtime(&event->bytecode_runtime_head);
}

void lttng_free_trigger_filter_runtime(struct lttng_trigger *trigger)
{
	free_filter_runtime(&trigger->bytecode_runtime_head);
}
Commit	Line	Data
2d78951a MD	1	/*
	2	* lttng-filter.c
	3	*
	4	* LTTng UST filter code.
	5	*
7e50015d	6	* Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2d78951a	7	*
7e50015d MD	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:
2d78951a	14	*
7e50015d MD	15	* The above copyright notice and this permission notice shall be included in
7e50015d MD	16	* all copies or substantial portions of the Software.
2d78951a	17	*
7e50015d MD	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.
2d78951a MD	25	*/
2d78951a MD	26
3fbec7dc	27	#define _LGPL_SOURCE
b4051ad8	28	#include <stddef.h>
fb31eb73 FD	29	#include <stdint.h>
fb31eb73 FD	30
f488575f	31	#include <urcu/rculist.h>
fb31eb73	32
97b58163	33	#include "lttng-filter.h"
d5fc3224	34	#include "ust-events-internal.h"
cd54f6d9 MD	35
	36	static const char *opnames[] = {
	37	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",
	38
	39	[ FILTER_OP_RETURN ] = "RETURN",
	40
	41	/* binary */
	42	[ FILTER_OP_MUL ] = "MUL",
	43	[ FILTER_OP_DIV ] = "DIV",
	44	[ FILTER_OP_MOD ] = "MOD",
	45	[ FILTER_OP_PLUS ] = "PLUS",
	46	[ FILTER_OP_MINUS ] = "MINUS",
0039e2d8 MD	47	[ FILTER_OP_BIT_RSHIFT ] = "BIT_RSHIFT",
0039e2d8 MD	48	[ FILTER_OP_BIT_LSHIFT ] = "BIT_LSHIFT",
47e5f13e MD	49	[ FILTER_OP_BIT_AND ] = "BIT_AND",
	50	[ FILTER_OP_BIT_OR ] = "BIT_OR",
	51	[ FILTER_OP_BIT_XOR ] = "BIT_XOR",
226106c0 MD	52
226106c0 MD	53	/* binary comparators */
cd54f6d9 MD	54	[ FILTER_OP_EQ ] = "EQ",
	55	[ FILTER_OP_NE ] = "NE",
	56	[ FILTER_OP_GT ] = "GT",
	57	[ FILTER_OP_LT ] = "LT",
	58	[ FILTER_OP_GE ] = "GE",
	59	[ FILTER_OP_LE ] = "LE",
	60
226106c0 MD	61	/* string binary comparators */
	62	[ FILTER_OP_EQ_STRING ] = "EQ_STRING",
	63	[ FILTER_OP_NE_STRING ] = "NE_STRING",
	64	[ FILTER_OP_GT_STRING ] = "GT_STRING",
	65	[ FILTER_OP_LT_STRING ] = "LT_STRING",
	66	[ FILTER_OP_GE_STRING ] = "GE_STRING",
	67	[ FILTER_OP_LE_STRING ] = "LE_STRING",
	68
	69	/* s64 binary comparators */
	70	[ FILTER_OP_EQ_S64 ] = "EQ_S64",
	71	[ FILTER_OP_NE_S64 ] = "NE_S64",
	72	[ FILTER_OP_GT_S64 ] = "GT_S64",
	73	[ FILTER_OP_LT_S64 ] = "LT_S64",
	74	[ FILTER_OP_GE_S64 ] = "GE_S64",
	75	[ FILTER_OP_LE_S64 ] = "LE_S64",
	76
	77	/* double binary comparators */
	78	[ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
	79	[ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
	80	[ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
	81	[ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
	82	[ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
	83	[ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",
	84
1e5f62b4 MD	85	/* Mixed S64-double binary comparators */
	86	[ FILTER_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64",
	87	[ FILTER_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64",
	88	[ FILTER_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64",
	89	[ FILTER_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64",
	90	[ FILTER_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64",
	91	[ FILTER_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64",
	92
	93	[ FILTER_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE",
	94	[ FILTER_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE",
	95	[ FILTER_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE",
	96	[ FILTER_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE",
	97	[ FILTER_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE",
	98	[ FILTER_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE",
226106c0	99
cd54f6d9 MD	100	/* unary */
	101	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	102	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	103	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
226106c0 MD	104	[ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
	105	[ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
	106	[ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
	107	[ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
	108	[ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
	109	[ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",
cd54f6d9 MD	110
	111	/* logical */
	112	[ FILTER_OP_AND ] = "AND",
	113	[ FILTER_OP_OR ] = "OR",
	114
77aa5901	115	/* load field ref */
cd54f6d9	116	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
2f0145d1 MD	117	[ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
	118	[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
	119	[ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
	120	[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",
	121
77aa5901	122	/* load from immediate operand */
cd54f6d9 MD	123	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
cd54f6d9 MD	124	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
da6eed25	125	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
49905038 MD	126
	127	/* cast */
	128	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
	129	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
	130	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",
77aa5901 MD	131
	132	/* get context ref */
	133	[ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF",
	134	[ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING",
	135	[ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64",
	136	[ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE",
f6753f2d MD	137
	138	/* load userspace field ref */
	139	[ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING",
	140	[ FILTER_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	[ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING",
	147
	148	/* globbing pattern binary operator: apply to */
	149	[ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING",
	150	[ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING",
47e5f13e MD	151
	152	/*
	153	* Instructions for recursive traversal through composed types.
	154	*/
	155	[ FILTER_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT",
	156	[ FILTER_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT",
	157	[ FILTER_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT",
	158
	159	[ FILTER_OP_GET_SYMBOL ] = "GET_SYMBOL",
	160	[ FILTER_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD",
	161	[ FILTER_OP_GET_INDEX_U16 ] = "GET_INDEX_U16",
	162	[ FILTER_OP_GET_INDEX_U64 ] = "GET_INDEX_U64",
	163
	164	[ FILTER_OP_LOAD_FIELD ] = "LOAD_FIELD",
	165	[ FILTER_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8",
	166	[ FILTER_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16",
	167	[ FILTER_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32",
	168	[ FILTER_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64",
	169	[ FILTER_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8",
	170	[ FILTER_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16",
	171	[ FILTER_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32",
	172	[ FILTER_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64",
	173	[ FILTER_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING",
	174	[ FILTER_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE",
	175	[ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE",
0039e2d8 MD	176
0039e2d8 MD	177	[ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT",
93c591bb MD	178
93c591bb MD	179	[ FILTER_OP_RETURN_S64 ] = "RETURN_S64",
cd54f6d9 MD	180	};
cd54f6d9 MD	181
cd54f6d9 MD	182	const char *print_op(enum filter_op op)
	183	{
	184	if (op >= NR_FILTER_OPS)
	185	return "UNKNOWN";
	186	else
	187	return opnames[op];
	188	}
	189
cd54f6d9	190	static
d5fc3224	191	int apply_field_reloc(const struct lttng_event_desc *event_desc,
cd54f6d9 MD	192	struct bytecode_runtime *runtime,
	193	uint32_t runtime_len,
	194	uint32_t reloc_offset,
47e5f13e MD	195	const char *field_name,
47e5f13e MD	196	enum filter_op filter_op)
cd54f6d9	197	{
cd54f6d9 MD	198	const struct lttng_event_field fields, field = NULL;
cd54f6d9 MD	199	unsigned int nr_fields, i;
2f0145d1	200	struct load_op *op;
cd54f6d9 MD	201	uint32_t field_offset = 0;
cd54f6d9 MD	202
77aa5901	203	dbg_printf("Apply field reloc: %u %s\n", reloc_offset, field_name);
cd54f6d9 MD	204
cd54f6d9 MD	205	/* Lookup event by name */
d5fc3224	206	if (!event_desc)
cd54f6d9	207	return -EINVAL;
d5fc3224	208	fields = event_desc->fields;
cd54f6d9 MD	209	if (!fields)
cd54f6d9 MD	210	return -EINVAL;
d5fc3224	211	nr_fields = event_desc->nr_fields;
cd54f6d9 MD	212	for (i = 0; i < nr_fields; i++) {
	213	if (!strcmp(fields[i].name, field_name)) {
	214	field = &fields[i];
	215	break;
	216	}
	217	/* compute field offset */
	218	switch (fields[i].type.atype) {
	219	case atype_integer:
	220	case atype_enum:
	221	field_offset += sizeof(int64_t);
	222	break;
	223	case atype_array:
	224	case atype_sequence:
	225	field_offset += sizeof(unsigned long);
	226	field_offset += sizeof(void *);
	227	break;
	228	case atype_string:
	229	field_offset += sizeof(void *);
	230	break;
	231	case atype_float:
	232	field_offset += sizeof(double);
da6eed25	233	break;
cd54f6d9 MD	234	default:
	235	return -EINVAL;
	236	}
	237	}
	238	if (!field)
	239	return -EINVAL;
	240
	241	/* Check if field offset is too large for 16-bit offset */
5b4839a8	242	if (field_offset > FILTER_BYTECODE_MAX_LEN - 1)
cd54f6d9 MD	243	return -EINVAL;
	244
	245	/* set type */
47e5f13e MD	246	op = (struct load_op *) &runtime->code[reloc_offset];
	247
	248	switch (filter_op) {
	249	case FILTER_OP_LOAD_FIELD_REF:
	250	{
	251	struct field_ref *field_ref;
	252
	253	field_ref = (struct field_ref *) op->data;
	254	switch (field->type.atype) {
	255	case atype_integer:
	256	case atype_enum:
	257	op->op = FILTER_OP_LOAD_FIELD_REF_S64;
	258	break;
	259	case atype_array:
	260	case atype_sequence:
	261	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
	262	break;
	263	case atype_string:
	264	op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
	265	break;
	266	case atype_float:
	267	op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
	268	break;
	269	default:
	270	return -EINVAL;
	271	}
	272	/* set offset */
	273	field_ref->offset = (uint16_t) field_offset;
da6eed25	274	break;
47e5f13e	275	}
cd54f6d9 MD	276	default:
	277	return -EINVAL;
	278	}
2d78951a MD	279	return 0;
	280	}
	281
77aa5901	282	static
d5fc3224	283	int apply_context_reloc(struct bytecode_runtime *runtime,
77aa5901 MD	284	uint32_t runtime_len,
77aa5901 MD	285	uint32_t reloc_offset,
47e5f13e MD	286	const char *context_name,
47e5f13e MD	287	enum filter_op filter_op)
77aa5901	288	{
77aa5901 MD	289	struct load_op *op;
	290	struct lttng_ctx_field *ctx_field;
	291	int idx;
d5fc3224	292	struct lttng_ctx ctx = runtime->p.ctx;
77aa5901 MD	293
	294	dbg_printf("Apply context reloc: %u %s\n", reloc_offset, context_name);
	295
	296	/* Get context index */
d5fc3224	297	idx = lttng_get_context_index(ctx, context_name);
53569322 MD	298	if (idx < 0) {
	299	if (lttng_context_is_app(context_name)) {
	300	int ret;
	301
	302	ret = lttng_ust_add_app_context_to_ctx_rcu(context_name,
d5fc3224	303	&ctx);
53569322 MD	304	if (ret)
53569322 MD	305	return ret;
d5fc3224	306	idx = lttng_get_context_index(ctx, context_name);
53569322 MD	307	if (idx < 0)
	308	return -ENOENT;
	309	} else {
	310	return -ENOENT;
	311	}
	312	}
77aa5901 MD	313	/* Check if idx is too large for 16-bit offset */
	314	if (idx > FILTER_BYTECODE_MAX_LEN - 1)
	315	return -EINVAL;
	316
	317	/* Get context return type */
d5fc3224	318	ctx_field = &ctx->fields[idx];
47e5f13e MD	319	op = (struct load_op *) &runtime->code[reloc_offset];
	320
	321	switch (filter_op) {
	322	case FILTER_OP_GET_CONTEXT_REF:
	323	{
	324	struct field_ref *field_ref;
	325
	326	field_ref = (struct field_ref *) op->data;
	327	switch (ctx_field->event_field.type.atype) {
	328	case atype_integer:
	329	case atype_enum:
	330	op->op = FILTER_OP_GET_CONTEXT_REF_S64;
	331	break;
	332	/* Sequence and array supported as string */
	333	case atype_string:
	334	case atype_array:
	335	case atype_sequence:
	336	op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
	337	break;
	338	case atype_float:
	339	op->op = FILTER_OP_GET_CONTEXT_REF_DOUBLE;
	340	break;
	341	case atype_dynamic:
	342	op->op = FILTER_OP_GET_CONTEXT_REF;
	343	break;
	344	default:
	345	return -EINVAL;
	346	}
	347	/* set offset to context index within channel contexts */
	348	field_ref->offset = (uint16_t) idx;
53569322	349	break;
47e5f13e	350	}
77aa5901 MD	351	default:
	352	return -EINVAL;
	353	}
77aa5901 MD	354	return 0;
	355	}
	356
	357	static
d5fc3224	358	int apply_reloc(const struct lttng_event_desc *event_desc,
77aa5901 MD	359	struct bytecode_runtime *runtime,
	360	uint32_t runtime_len,
	361	uint32_t reloc_offset,
	362	const char *name)
	363	{
	364	struct load_op *op;
	365
	366	dbg_printf("Apply reloc: %u %s\n", reloc_offset, name);
	367
	368	/* Ensure that the reloc is within the code */
	369	if (runtime_len - reloc_offset < sizeof(uint16_t))
	370	return -EINVAL;
	371
47e5f13e	372	op = (struct load_op *) &runtime->code[reloc_offset];
77aa5901 MD	373	switch (op->op) {
77aa5901 MD	374	case FILTER_OP_LOAD_FIELD_REF:
d5fc3224	375	return apply_field_reloc(event_desc, runtime, runtime_len,
47e5f13e	376	reloc_offset, name, op->op);
77aa5901	377	case FILTER_OP_GET_CONTEXT_REF:
d5fc3224	378	return apply_context_reloc(runtime, runtime_len,
47e5f13e MD	379	reloc_offset, name, op->op);
	380	case FILTER_OP_GET_SYMBOL:
	381	case FILTER_OP_GET_SYMBOL_FIELD:
	382	/*
	383	* Will be handled by load specialize phase or
	384	* dynamically by interpreter.
	385	*/
	386	return 0;
77aa5901 MD	387	default:
	388	ERR("Unknown reloc op type %u\n", op->op);
	389	return -EINVAL;
	390	}
	391	return 0;
	392	}
	393
f488575f MD	394	static
f488575f MD	395	int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
d5fc3224	396	struct cds_list_head *bytecode_runtime_head)
f488575f MD	397	{
	398	struct lttng_bytecode_runtime *bc_runtime;
	399
d5fc3224	400	cds_list_for_each_entry(bc_runtime, bytecode_runtime_head, node) {
f488575f MD	401	if (bc_runtime->bc == filter_bytecode)
	402	return 1;
	403	}
	404	return 0;
	405	}
	406
cd54f6d9 MD	407	/*
	408	* Take a bytecode with reloc table and link it to an event to create a
	409	* bytecode runtime.
	410	*/
2d78951a	411	static
d5fc3224 FD	412	int _lttng_filter_link_bytecode(const struct lttng_event_desc *event_desc,
d5fc3224 FD	413	struct lttng_ctx **ctx,
e58095ef MD	414	struct lttng_ust_filter_bytecode_node *filter_bytecode,
e58095ef MD	415	struct cds_list_head *insert_loc)
2d78951a	416	{
cd54f6d9 MD	417	int ret, offset, next_offset;
	418	struct bytecode_runtime *runtime = NULL;
	419	size_t runtime_alloc_len;
	420
2d78951a MD	421	if (!filter_bytecode)
2d78951a MD	422	return 0;
cd54f6d9	423	/* Bytecode already linked */
d5fc3224	424	if (bytecode_is_linked(filter_bytecode, insert_loc))
cd54f6d9	425	return 0;
2d78951a	426
f488575f	427	dbg_printf("Linking...\n");
cd54f6d9 MD	428
cd54f6d9 MD	429	/* We don't need the reloc table in the runtime */
f488575f	430	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
cd54f6d9 MD	431	runtime = zmalloc(runtime_alloc_len);
	432	if (!runtime) {
	433	ret = -ENOMEM;
e0a7d7ab	434	goto alloc_error;
cd54f6d9	435	}
f488575f	436	runtime->p.bc = filter_bytecode;
d5fc3224	437	runtime->p.ctx = ctx;
f488575f	438	runtime->len = filter_bytecode->bc.reloc_offset;
cd54f6d9	439	/* copy original bytecode */
47e5f13e	440	memcpy(runtime->code, filter_bytecode->bc.data, runtime->len);
cd54f6d9 MD	441	/*
	442	* apply relocs. Those are a uint16_t (offset in bytecode)
	443	* followed by a string (field name).
	444	*/
f488575f MD	445	for (offset = filter_bytecode->bc.reloc_offset;
f488575f MD	446	offset < filter_bytecode->bc.len;
cd54f6d9 MD	447	offset = next_offset) {
cd54f6d9 MD	448	uint16_t reloc_offset =
f488575f	449	(uint16_t ) &filter_bytecode->bc.data[offset];
77aa5901	450	const char *name =
f488575f	451	(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];
cd54f6d9	452
d5fc3224	453	ret = apply_reloc(event_desc, runtime, runtime->len, reloc_offset, name);
cd54f6d9 MD	454	if (ret) {
	455	goto link_error;
	456	}
77aa5901	457	next_offset = offset + sizeof(uint16_t) + strlen(name) + 1;
cd54f6d9	458	}
9522a886 MD	459	/* Validate bytecode */
	460	ret = lttng_filter_validate_bytecode(runtime);
	461	if (ret) {
	462	goto link_error;
	463	}
08c84b15	464	/* Specialize bytecode */
d5fc3224	465	ret = lttng_filter_specialize_bytecode(event_desc, runtime);
08c84b15 MD	466	if (ret) {
	467	goto link_error;
	468	}
f488575f	469	runtime->p.filter = lttng_filter_interpret_bytecode;
21af05a9	470	runtime->p.link_failed = 0;
e58095ef	471	cds_list_add_rcu(&runtime->p.node, insert_loc);
f488575f	472	dbg_printf("Linking successful.\n");
2d78951a	473	return 0;
cd54f6d9 MD	474
cd54f6d9 MD	475	link_error:
f488575f	476	runtime->p.filter = lttng_filter_false;
21af05a9	477	runtime->p.link_failed = 1;
e58095ef	478	cds_list_add_rcu(&runtime->p.node, insert_loc);
e0a7d7ab	479	alloc_error:
f488575f	480	dbg_printf("Linking failed.\n");
cd54f6d9	481	return ret;
2d78951a MD	482	}
2d78951a MD	483
e58095ef	484	void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
2d78951a	485	{
e58095ef	486	struct lttng_ust_filter_bytecode_node *bc = runtime->bc;
f488575f	487
21af05a9	488	if (!bc->enabler->enabled \|\| runtime->link_failed)
e58095ef	489	runtime->filter = lttng_filter_false;
21af05a9 MD	490	else
21af05a9 MD	491	runtime->filter = lttng_filter_interpret_bytecode;
2d78951a MD	492	}
	493
	494	/*
e58095ef	495	* Link bytecode for all enablers referenced by an event.
2d78951a	496	*/
d5fc3224 FD	497	void lttng_enabler_link_bytecode(const struct lttng_event_desc *event_desc,
	498	struct lttng_ctx **ctx,
	499	struct cds_list_head *bytecode_runtime_head,
e58095ef	500	struct lttng_enabler *enabler)
2d78951a	501	{
e58095ef MD	502	struct lttng_ust_filter_bytecode_node *bc;
	503	struct lttng_bytecode_runtime *runtime;
	504
d5fc3224	505	assert(event_desc);
e58095ef MD	506
	507	/* Link each bytecode. */
	508	cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
	509	int found = 0, ret;
	510	struct cds_list_head *insert_loc;
	511
	512	cds_list_for_each_entry(runtime,
d5fc3224	513	bytecode_runtime_head, node) {
e58095ef MD	514	if (runtime->bc == bc) {
	515	found = 1;
	516	break;
	517	}
	518	}
	519	/* Skip bytecode already linked */
	520	if (found)
	521	continue;
	522
	523	/*
	524	* Insert at specified priority (seqnum) in increasing
	525	* order.
	526	*/
	527	cds_list_for_each_entry_reverse(runtime,
d5fc3224	528	bytecode_runtime_head, node) {
e58095ef MD	529	if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
	530	/* insert here */
	531	insert_loc = &runtime->node;
	532	goto add_within;
	533	}
	534	}
d5fc3224	535
e58095ef	536	/* Add to head to list */
d5fc3224	537	insert_loc = bytecode_runtime_head;
e58095ef	538	add_within:
f488575f	539	dbg_printf("linking bytecode\n");
d5fc3224 FD	540	ret = _lttng_filter_link_bytecode(event_desc, ctx, bc,
d5fc3224 FD	541	insert_loc);
e58095ef MD	542	if (ret) {
	543	dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
	544	}
2d78951a	545	}
2d78951a MD	546	}
	547
	548	/*
e58095ef	549	* We own the filter_bytecode if we return success.
2d78951a	550	*/
e58095ef	551	int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
f488575f	552	struct lttng_ust_filter_bytecode_node *filter_bytecode)
2d78951a	553	{
e58095ef	554	cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
2d78951a MD	555	return 0;
2d78951a MD	556	}
f488575f	557
d5fc3224 FD	558	static
d5fc3224 FD	559	void free_filter_runtime(struct cds_list_head *bytecode_runtime_head)
f488575f MD	560	{
	561	struct bytecode_runtime runtime, tmp;
	562
d5fc3224 FD	563	cds_list_for_each_entry_safe(runtime, tmp, bytecode_runtime_head,
d5fc3224 FD	564	p.node) {
47e5f13e	565	free(runtime->data);
f488575f MD	566	free(runtime);
	567	}
	568	}
d5fc3224 FD	569
	570	void lttng_free_event_filter_runtime(struct lttng_event *event)
	571	{
	572	free_filter_runtime(&event->bytecode_runtime_head);
	573	}
	574
	575	void lttng_free_trigger_filter_runtime(struct lttng_trigger *trigger)
	576	{
	577	free_filter_runtime(&trigger->bytecode_runtime_head);
	578	}