[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 <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_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(struct lttng_event *event,
		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_desc *desc;
	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 */
	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->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:
		{
			const struct lttng_basic_type *elem_type = &field->type.u.array.elem_type;

			if (elem_type != atype_integer || elem_type->u.basic.integer.encoding == lttng_encode_none)
				return -EINVAL;
			op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
			break;
		}
		case atype_sequence:
		{
			const struct lttng_basic_type *elem_type = &field->type.u.sequence.elem_type;

			if (elem_type != atype_integer || elem_type->u.basic.integer.encoding == lttng_encode_none)
				return -EINVAL;
			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 lttng_event *event,
		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_session *session = runtime->p.session;

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

	/* Get context index */
	idx = lttng_get_context_index(session->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,
					&session->ctx);
			if (ret)
				return ret;
			idx = lttng_get_context_index(session->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 = &session->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_array:
		{
			const struct lttng_basic_type *elem_type = &ctx_field->event_field.type.u.array.elem_type;

			if (elem_type != atype_integer || elem_type->u.basic.integer.encoding == lttng_encode_none)
				return -EINVAL;
			op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
			break;
		}
		case atype_sequence:
		{
			const struct lttng_basic_type *elem_type = &ctx_field->event_field.type.u.sequence.elem_type;

			if (elem_type != atype_integer || elem_type->u.basic.integer.encoding == lttng_encode_none)
				return -EINVAL;
			op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
			break;
		}
		case atype_string:
			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(struct lttng_event *event,
		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, runtime, runtime_len,
			reloc_offset, name, op->op);
	case FILTER_OP_GET_CONTEXT_REF:
		return apply_context_reloc(event, 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 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 alloc_error;
	}
	runtime->p.bc = filter_bytecode;
	runtime->p.session = event->chan->session;
	runtime->p.event = event;
	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, 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, 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_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->data);
		free(runtime);
	}
}
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
f488575f	28	#include <urcu/rculist.h>
97b58163	29	#include "lttng-filter.h"
cd54f6d9 MD	30
	31	static const char *opnames[] = {
	32	[ FILTER_OP_UNKNOWN ] = "UNKNOWN",
	33
	34	[ FILTER_OP_RETURN ] = "RETURN",
	35
	36	/* binary */
	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",
0039e2d8 MD	42	[ FILTER_OP_BIT_RSHIFT ] = "BIT_RSHIFT",
0039e2d8 MD	43	[ FILTER_OP_BIT_LSHIFT ] = "BIT_LSHIFT",
47e5f13e MD	44	[ FILTER_OP_BIT_AND ] = "BIT_AND",
	45	[ FILTER_OP_BIT_OR ] = "BIT_OR",
	46	[ FILTER_OP_BIT_XOR ] = "BIT_XOR",
226106c0 MD	47
226106c0 MD	48	/* binary comparators */
cd54f6d9 MD	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",
	55
226106c0 MD	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",
	63
	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",
	71
	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",
	79
1e5f62b4 MD	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",
	87
	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",
226106c0	94
cd54f6d9 MD	95	/* unary */
	96	[ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
	97	[ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
	98	[ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
226106c0 MD	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",
cd54f6d9 MD	105
	106	/* logical */
	107	[ FILTER_OP_AND ] = "AND",
	108	[ FILTER_OP_OR ] = "OR",
	109
77aa5901	110	/* load field ref */
cd54f6d9	111	[ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
2f0145d1 MD	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",
	116
77aa5901	117	/* load from immediate operand */
cd54f6d9 MD	118	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
cd54f6d9 MD	119	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
da6eed25	120	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
49905038 MD	121
	122	/* cast */
	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",
77aa5901 MD	126
	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",
f6753f2d MD	132
	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",
	136
	137	/*
	138	* load immediate star globbing pattern (literal string)
	139	* from immediate.
	140	*/
	141	[ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING",
	142
	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",
47e5f13e MD	146
	147	/*
	148	* Instructions for recursive traversal through composed types.
	149	*/
	150	[ FILTER_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT",
	151	[ FILTER_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT",
	152	[ FILTER_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT",
	153
	154	[ FILTER_OP_GET_SYMBOL ] = "GET_SYMBOL",
	155	[ FILTER_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD",
	156	[ FILTER_OP_GET_INDEX_U16 ] = "GET_INDEX_U16",
	157	[ FILTER_OP_GET_INDEX_U64 ] = "GET_INDEX_U64",
	158
	159	[ FILTER_OP_LOAD_FIELD ] = "LOAD_FIELD",
	160	[ FILTER_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8",
	161	[ FILTER_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16",
	162	[ FILTER_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32",
	163	[ FILTER_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64",
	164	[ FILTER_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8",
	165	[ FILTER_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16",
	166	[ FILTER_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32",
	167	[ FILTER_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64",
	168	[ FILTER_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING",
	169	[ FILTER_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE",
	170	[ FILTER_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE",
0039e2d8 MD	171
0039e2d8 MD	172	[ FILTER_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT",
93c591bb MD	173
93c591bb MD	174	[ FILTER_OP_RETURN_S64 ] = "RETURN_S64",
cd54f6d9 MD	175	};
cd54f6d9 MD	176
cd54f6d9 MD	177	const char *print_op(enum filter_op op)
	178	{
	179	if (op >= NR_FILTER_OPS)
	180	return "UNKNOWN";
	181	else
	182	return opnames[op];
	183	}
	184
cd54f6d9	185	static
7dd08bec	186	int apply_field_reloc(struct lttng_event *event,
cd54f6d9 MD	187	struct bytecode_runtime *runtime,
	188	uint32_t runtime_len,
	189	uint32_t reloc_offset,
47e5f13e MD	190	const char *field_name,
47e5f13e MD	191	enum filter_op filter_op)
cd54f6d9 MD	192	{
	193	const struct lttng_event_desc *desc;
	194	const struct lttng_event_field fields, field = NULL;
	195	unsigned int nr_fields, i;
2f0145d1	196	struct load_op *op;
cd54f6d9 MD	197	uint32_t field_offset = 0;
cd54f6d9 MD	198
77aa5901	199	dbg_printf("Apply field reloc: %u %s\n", reloc_offset, field_name);
cd54f6d9 MD	200
	201	/* Lookup event by name */
	202	desc = event->desc;
	203	if (!desc)
	204	return -EINVAL;
	205	fields = desc->fields;
	206	if (!fields)
	207	return -EINVAL;
	208	nr_fields = desc->nr_fields;
	209	for (i = 0; i < nr_fields; i++) {
	210	if (!strcmp(fields[i].name, field_name)) {
	211	field = &fields[i];
	212	break;
	213	}
	214	/* compute field offset */
	215	switch (fields[i].type.atype) {
	216	case atype_integer:
	217	case atype_enum:
	218	field_offset += sizeof(int64_t);
	219	break;
	220	case atype_array:
	221	case atype_sequence:
	222	field_offset += sizeof(unsigned long);
	223	field_offset += sizeof(void *);
	224	break;
	225	case atype_string:
	226	field_offset += sizeof(void *);
	227	break;
	228	case atype_float:
	229	field_offset += sizeof(double);
da6eed25	230	break;
cd54f6d9 MD	231	default:
	232	return -EINVAL;
	233	}
	234	}
	235	if (!field)
	236	return -EINVAL;
	237
	238	/* Check if field offset is too large for 16-bit offset */
5b4839a8	239	if (field_offset > FILTER_BYTECODE_MAX_LEN - 1)
cd54f6d9 MD	240	return -EINVAL;
	241
	242	/* set type */
47e5f13e MD	243	op = (struct load_op *) &runtime->code[reloc_offset];
	244
	245	switch (filter_op) {
	246	case FILTER_OP_LOAD_FIELD_REF:
	247	{
	248	struct field_ref *field_ref;
	249
	250	field_ref = (struct field_ref *) op->data;
	251	switch (field->type.atype) {
	252	case atype_integer:
	253	case atype_enum:
	254	op->op = FILTER_OP_LOAD_FIELD_REF_S64;
	255	break;
	256	case atype_array:
b82404da MD	257	{
	258	const struct lttng_basic_type *elem_type = &field->type.u.array.elem_type;
	259
	260	if (elem_type != atype_integer \|\| elem_type->u.basic.integer.encoding == lttng_encode_none)
	261	return -EINVAL;
	262	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
	263	break;
	264	}
47e5f13e	265	case atype_sequence:
b82404da MD	266	{
	267	const struct lttng_basic_type *elem_type = &field->type.u.sequence.elem_type;
	268
	269	if (elem_type != atype_integer \|\| elem_type->u.basic.integer.encoding == lttng_encode_none)
	270	return -EINVAL;
47e5f13e MD	271	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
47e5f13e MD	272	break;
b82404da	273	}
47e5f13e MD	274	case atype_string:
	275	op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
	276	break;
	277	case atype_float:
	278	op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
	279	break;
	280	default:
	281	return -EINVAL;
	282	}
	283	/* set offset */
	284	field_ref->offset = (uint16_t) field_offset;
da6eed25	285	break;
47e5f13e	286	}
cd54f6d9 MD	287	default:
	288	return -EINVAL;
	289	}
2d78951a MD	290	return 0;
	291	}
	292
77aa5901 MD	293	static
	294	int apply_context_reloc(struct lttng_event *event,
	295	struct bytecode_runtime *runtime,
	296	uint32_t runtime_len,
	297	uint32_t reloc_offset,
47e5f13e MD	298	const char *context_name,
47e5f13e MD	299	enum filter_op filter_op)
77aa5901	300	{
77aa5901 MD	301	struct load_op *op;
	302	struct lttng_ctx_field *ctx_field;
	303	int idx;
53569322	304	struct lttng_session *session = runtime->p.session;
77aa5901 MD	305
	306	dbg_printf("Apply context reloc: %u %s\n", reloc_offset, context_name);
	307
	308	/* Get context index */
53569322 MD	309	idx = lttng_get_context_index(session->ctx, context_name);
	310	if (idx < 0) {
	311	if (lttng_context_is_app(context_name)) {
	312	int ret;
	313
	314	ret = lttng_ust_add_app_context_to_ctx_rcu(context_name,
	315	&session->ctx);
	316	if (ret)
	317	return ret;
	318	idx = lttng_get_context_index(session->ctx,
	319	context_name);
	320	if (idx < 0)
	321	return -ENOENT;
	322	} else {
	323	return -ENOENT;
	324	}
	325	}
77aa5901 MD	326	/* Check if idx is too large for 16-bit offset */
	327	if (idx > FILTER_BYTECODE_MAX_LEN - 1)
	328	return -EINVAL;
	329
	330	/* Get context return type */
53569322	331	ctx_field = &session->ctx->fields[idx];
47e5f13e MD	332	op = (struct load_op *) &runtime->code[reloc_offset];
	333
	334	switch (filter_op) {
	335	case FILTER_OP_GET_CONTEXT_REF:
	336	{
	337	struct field_ref *field_ref;
	338
	339	field_ref = (struct field_ref *) op->data;
	340	switch (ctx_field->event_field.type.atype) {
	341	case atype_integer:
	342	case atype_enum:
	343	op->op = FILTER_OP_GET_CONTEXT_REF_S64;
	344	break;
	345	/* Sequence and array supported as string */
47e5f13e	346	case atype_array:
b82404da MD	347	{
	348	const struct lttng_basic_type *elem_type = &ctx_field->event_field.type.u.array.elem_type;
	349
	350	if (elem_type != atype_integer \|\| elem_type->u.basic.integer.encoding == lttng_encode_none)
	351	return -EINVAL;
	352	op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
	353	break;
	354	}
47e5f13e	355	case atype_sequence:
b82404da MD	356	{
	357	const struct lttng_basic_type *elem_type = &ctx_field->event_field.type.u.sequence.elem_type;
	358
	359	if (elem_type != atype_integer \|\| elem_type->u.basic.integer.encoding == lttng_encode_none)
	360	return -EINVAL;
	361	op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
	362	break;
	363	}
	364	case atype_string:
47e5f13e MD	365	op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
	366	break;
	367	case atype_float:
	368	op->op = FILTER_OP_GET_CONTEXT_REF_DOUBLE;
	369	break;
	370	case atype_dynamic:
	371	op->op = FILTER_OP_GET_CONTEXT_REF;
	372	break;
	373	default:
	374	return -EINVAL;
	375	}
	376	/* set offset to context index within channel contexts */
	377	field_ref->offset = (uint16_t) idx;
53569322	378	break;
47e5f13e	379	}
77aa5901 MD	380	default:
	381	return -EINVAL;
	382	}
77aa5901 MD	383	return 0;
	384	}
	385
	386	static
	387	int apply_reloc(struct lttng_event *event,
	388	struct bytecode_runtime *runtime,
	389	uint32_t runtime_len,
	390	uint32_t reloc_offset,
	391	const char *name)
	392	{
	393	struct load_op *op;
	394
	395	dbg_printf("Apply reloc: %u %s\n", reloc_offset, name);
	396
	397	/* Ensure that the reloc is within the code */
	398	if (runtime_len - reloc_offset < sizeof(uint16_t))
	399	return -EINVAL;
	400
47e5f13e	401	op = (struct load_op *) &runtime->code[reloc_offset];
77aa5901 MD	402	switch (op->op) {
	403	case FILTER_OP_LOAD_FIELD_REF:
	404	return apply_field_reloc(event, runtime, runtime_len,
47e5f13e	405	reloc_offset, name, op->op);
77aa5901 MD	406	case FILTER_OP_GET_CONTEXT_REF:
77aa5901 MD	407	return apply_context_reloc(event, runtime, runtime_len,
47e5f13e MD	408	reloc_offset, name, op->op);
	409	case FILTER_OP_GET_SYMBOL:
	410	case FILTER_OP_GET_SYMBOL_FIELD:
	411	/*
	412	* Will be handled by load specialize phase or
	413	* dynamically by interpreter.
	414	*/
	415	return 0;
77aa5901 MD	416	default:
	417	ERR("Unknown reloc op type %u\n", op->op);
	418	return -EINVAL;
	419	}
	420	return 0;
	421	}
	422
f488575f MD	423	static
f488575f MD	424	int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
7dd08bec	425	struct lttng_event *event)
f488575f MD	426	{
	427	struct lttng_bytecode_runtime *bc_runtime;
	428
e58095ef MD	429	cds_list_for_each_entry(bc_runtime,
e58095ef MD	430	&event->bytecode_runtime_head, node) {
f488575f MD	431	if (bc_runtime->bc == filter_bytecode)
	432	return 1;
	433	}
	434	return 0;
	435	}
	436
cd54f6d9 MD	437	/*
	438	* Take a bytecode with reloc table and link it to an event to create a
	439	* bytecode runtime.
	440	*/
2d78951a	441	static
7dd08bec	442	int _lttng_filter_event_link_bytecode(struct lttng_event *event,
e58095ef MD	443	struct lttng_ust_filter_bytecode_node *filter_bytecode,
e58095ef MD	444	struct cds_list_head *insert_loc)
2d78951a	445	{
cd54f6d9 MD	446	int ret, offset, next_offset;
	447	struct bytecode_runtime *runtime = NULL;
	448	size_t runtime_alloc_len;
	449
2d78951a MD	450	if (!filter_bytecode)
2d78951a MD	451	return 0;
cd54f6d9	452	/* Bytecode already linked */
f488575f	453	if (bytecode_is_linked(filter_bytecode, event))
cd54f6d9	454	return 0;
2d78951a	455
f488575f	456	dbg_printf("Linking...\n");
cd54f6d9 MD	457
cd54f6d9 MD	458	/* We don't need the reloc table in the runtime */
f488575f	459	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
cd54f6d9 MD	460	runtime = zmalloc(runtime_alloc_len);
	461	if (!runtime) {
	462	ret = -ENOMEM;
e0a7d7ab	463	goto alloc_error;
cd54f6d9	464	}
f488575f	465	runtime->p.bc = filter_bytecode;
53569322	466	runtime->p.session = event->chan->session;
47e5f13e	467	runtime->p.event = event;
f488575f	468	runtime->len = filter_bytecode->bc.reloc_offset;
cd54f6d9	469	/* copy original bytecode */
47e5f13e	470	memcpy(runtime->code, filter_bytecode->bc.data, runtime->len);
cd54f6d9 MD	471	/*
	472	* apply relocs. Those are a uint16_t (offset in bytecode)
	473	* followed by a string (field name).
	474	*/
f488575f MD	475	for (offset = filter_bytecode->bc.reloc_offset;
f488575f MD	476	offset < filter_bytecode->bc.len;
cd54f6d9 MD	477	offset = next_offset) {
cd54f6d9 MD	478	uint16_t reloc_offset =
f488575f	479	(uint16_t ) &filter_bytecode->bc.data[offset];
77aa5901	480	const char *name =
f488575f	481	(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];
cd54f6d9	482
77aa5901	483	ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name);
cd54f6d9 MD	484	if (ret) {
	485	goto link_error;
	486	}
77aa5901	487	next_offset = offset + sizeof(uint16_t) + strlen(name) + 1;
cd54f6d9	488	}
9522a886 MD	489	/* Validate bytecode */
	490	ret = lttng_filter_validate_bytecode(runtime);
	491	if (ret) {
	492	goto link_error;
	493	}
08c84b15	494	/* Specialize bytecode */
47e5f13e	495	ret = lttng_filter_specialize_bytecode(event, runtime);
08c84b15 MD	496	if (ret) {
	497	goto link_error;
	498	}
f488575f	499	runtime->p.filter = lttng_filter_interpret_bytecode;
21af05a9	500	runtime->p.link_failed = 0;
e58095ef	501	cds_list_add_rcu(&runtime->p.node, insert_loc);
f488575f	502	dbg_printf("Linking successful.\n");
2d78951a	503	return 0;
cd54f6d9 MD	504
cd54f6d9 MD	505	link_error:
f488575f	506	runtime->p.filter = lttng_filter_false;
21af05a9	507	runtime->p.link_failed = 1;
e58095ef	508	cds_list_add_rcu(&runtime->p.node, insert_loc);
e0a7d7ab	509	alloc_error:
f488575f	510	dbg_printf("Linking failed.\n");
cd54f6d9	511	return ret;
2d78951a MD	512	}
2d78951a MD	513
e58095ef	514	void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
2d78951a	515	{
e58095ef	516	struct lttng_ust_filter_bytecode_node *bc = runtime->bc;
f488575f	517
21af05a9	518	if (!bc->enabler->enabled \|\| runtime->link_failed)
e58095ef	519	runtime->filter = lttng_filter_false;
21af05a9 MD	520	else
21af05a9 MD	521	runtime->filter = lttng_filter_interpret_bytecode;
2d78951a MD	522	}
	523
	524	/*
e58095ef	525	* Link bytecode for all enablers referenced by an event.
2d78951a	526	*/
e58095ef MD	527	void lttng_enabler_event_link_bytecode(struct lttng_event *event,
e58095ef MD	528	struct lttng_enabler *enabler)
2d78951a	529	{
e58095ef MD	530	struct lttng_ust_filter_bytecode_node *bc;
	531	struct lttng_bytecode_runtime *runtime;
	532
	533	/* Can only be called for events with desc attached */
	534	assert(event->desc);
	535
	536	/* Link each bytecode. */
	537	cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
	538	int found = 0, ret;
	539	struct cds_list_head *insert_loc;
	540
	541	cds_list_for_each_entry(runtime,
	542	&event->bytecode_runtime_head, node) {
	543	if (runtime->bc == bc) {
	544	found = 1;
	545	break;
	546	}
	547	}
	548	/* Skip bytecode already linked */
	549	if (found)
	550	continue;
	551
	552	/*
	553	* Insert at specified priority (seqnum) in increasing
	554	* order.
	555	*/
	556	cds_list_for_each_entry_reverse(runtime,
	557	&event->bytecode_runtime_head, node) {
	558	if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
	559	/* insert here */
	560	insert_loc = &runtime->node;
	561	goto add_within;
	562	}
	563	}
	564	/* Add to head to list */
	565	insert_loc = &event->bytecode_runtime_head;
	566	add_within:
f488575f	567	dbg_printf("linking bytecode\n");
e58095ef MD	568	ret = _lttng_filter_event_link_bytecode(event, bc,
	569	insert_loc);
	570	if (ret) {
	571	dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
	572	}
2d78951a	573	}
2d78951a MD	574	}
	575
	576	/*
e58095ef	577	* We own the filter_bytecode if we return success.
2d78951a	578	*/
e58095ef	579	int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
f488575f	580	struct lttng_ust_filter_bytecode_node *filter_bytecode)
2d78951a	581	{
e58095ef	582	cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
2d78951a MD	583	return 0;
2d78951a MD	584	}
f488575f	585
e58095ef	586	void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
f488575f MD	587	{
	588	struct lttng_ust_filter_bytecode_node filter_bytecode, tmp;
	589
	590	cds_list_for_each_entry_safe(filter_bytecode, tmp,
e58095ef	591	&enabler->filter_bytecode_head, node) {
f488575f MD	592	free(filter_bytecode);
	593	}
	594	}
	595
7dd08bec	596	void lttng_free_event_filter_runtime(struct lttng_event *event)
f488575f MD	597	{
	598	struct bytecode_runtime runtime, tmp;
	599
	600	cds_list_for_each_entry_safe(runtime, tmp,
e58095ef	601	&event->bytecode_runtime_head, p.node) {
47e5f13e	602	free(runtime->data);
f488575f MD	603	free(runtime);
	604	}
	605	}