[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 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",
};

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 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->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 apply_context_reloc(struct lttng_event *event,
		struct bytecode_runtime *runtime,
		uint32_t runtime_len,
		uint32_t reloc_offset,
		const char *context_name)
{
	struct field_ref *field_ref;
	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->data[reloc_offset];
	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;
	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->data[reloc_offset];
	switch (op->op) {
	case FILTER_OP_LOAD_FIELD_REF:
		return apply_field_reloc(event, runtime, runtime_len,
			reloc_offset, name);
	case FILTER_OP_GET_CONTEXT_REF:
		return apply_context_reloc(event, runtime, runtime_len,
			reloc_offset, name);
	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->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 *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(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);
	}
}
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
77aa5901	105	/* load field ref */
cd54f6d9	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
77aa5901	112	/* load from immediate operand */
cd54f6d9 MD	113	[ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
cd54f6d9 MD	114	[ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
da6eed25	115	[ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
49905038 MD	116
	117	/* cast */
	118	[ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
	119	[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
	120	[ FILTER_OP_CAST_NOP ] = "CAST_NOP",
77aa5901 MD	121
	122	/* get context ref */
	123	[ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF",
	124	[ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING",
	125	[ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64",
	126	[ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE",
cd54f6d9 MD	127	};
cd54f6d9 MD	128
cd54f6d9 MD	129	const char *print_op(enum filter_op op)
	130	{
	131	if (op >= NR_FILTER_OPS)
	132	return "UNKNOWN";
	133	else
	134	return opnames[op];
	135	}
	136
cd54f6d9	137	static
7dd08bec	138	int apply_field_reloc(struct lttng_event *event,
cd54f6d9 MD	139	struct bytecode_runtime *runtime,
	140	uint32_t runtime_len,
	141	uint32_t reloc_offset,
	142	const char *field_name)
	143	{
	144	const struct lttng_event_desc *desc;
	145	const struct lttng_event_field fields, field = NULL;
	146	unsigned int nr_fields, i;
	147	struct field_ref *field_ref;
2f0145d1	148	struct load_op *op;
cd54f6d9 MD	149	uint32_t field_offset = 0;
cd54f6d9 MD	150
77aa5901	151	dbg_printf("Apply field reloc: %u %s\n", reloc_offset, field_name);
cd54f6d9 MD	152
	153	/* Lookup event by name */
	154	desc = event->desc;
	155	if (!desc)
	156	return -EINVAL;
	157	fields = desc->fields;
	158	if (!fields)
	159	return -EINVAL;
	160	nr_fields = desc->nr_fields;
	161	for (i = 0; i < nr_fields; i++) {
	162	if (!strcmp(fields[i].name, field_name)) {
	163	field = &fields[i];
	164	break;
	165	}
	166	/* compute field offset */
	167	switch (fields[i].type.atype) {
	168	case atype_integer:
	169	case atype_enum:
	170	field_offset += sizeof(int64_t);
	171	break;
	172	case atype_array:
	173	case atype_sequence:
	174	field_offset += sizeof(unsigned long);
	175	field_offset += sizeof(void *);
	176	break;
	177	case atype_string:
	178	field_offset += sizeof(void *);
	179	break;
	180	case atype_float:
	181	field_offset += sizeof(double);
da6eed25	182	break;
cd54f6d9 MD	183	default:
	184	return -EINVAL;
	185	}
	186	}
	187	if (!field)
	188	return -EINVAL;
	189
	190	/* Check if field offset is too large for 16-bit offset */
5b4839a8	191	if (field_offset > FILTER_BYTECODE_MAX_LEN - 1)
cd54f6d9 MD	192	return -EINVAL;
	193
	194	/* set type */
2f0145d1 MD	195	op = (struct load_op *) &runtime->data[reloc_offset];
2f0145d1 MD	196	field_ref = (struct field_ref *) op->data;
cd54f6d9 MD	197	switch (field->type.atype) {
	198	case atype_integer:
	199	case atype_enum:
2f0145d1	200	op->op = FILTER_OP_LOAD_FIELD_REF_S64;
cd54f6d9 MD	201	break;
	202	case atype_array:
	203	case atype_sequence:
2f0145d1	204	op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
cd54f6d9 MD	205	break;
cd54f6d9 MD	206	case atype_string:
2f0145d1	207	op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
cd54f6d9 MD	208	break;
cd54f6d9 MD	209	case atype_float:
2f0145d1	210	op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
da6eed25	211	break;
cd54f6d9 MD	212	default:
	213	return -EINVAL;
	214	}
	215	/* set offset */
	216	field_ref->offset = (uint16_t) field_offset;
2d78951a MD	217	return 0;
	218	}
	219
77aa5901 MD	220	static
	221	int apply_context_reloc(struct lttng_event *event,
	222	struct bytecode_runtime *runtime,
	223	uint32_t runtime_len,
	224	uint32_t reloc_offset,
	225	const char *context_name)
	226	{
	227	struct field_ref *field_ref;
	228	struct load_op *op;
	229	struct lttng_ctx_field *ctx_field;
	230	int idx;
53569322	231	struct lttng_session *session = runtime->p.session;
77aa5901 MD	232
	233	dbg_printf("Apply context reloc: %u %s\n", reloc_offset, context_name);
	234
	235	/* Get context index */
53569322 MD	236	idx = lttng_get_context_index(session->ctx, context_name);
	237	if (idx < 0) {
	238	if (lttng_context_is_app(context_name)) {
	239	int ret;
	240
	241	ret = lttng_ust_add_app_context_to_ctx_rcu(context_name,
	242	&session->ctx);
	243	if (ret)
	244	return ret;
	245	idx = lttng_get_context_index(session->ctx,
	246	context_name);
	247	if (idx < 0)
	248	return -ENOENT;
	249	} else {
	250	return -ENOENT;
	251	}
	252	}
77aa5901 MD	253	/* Check if idx is too large for 16-bit offset */
	254	if (idx > FILTER_BYTECODE_MAX_LEN - 1)
	255	return -EINVAL;
	256
	257	/* Get context return type */
53569322	258	ctx_field = &session->ctx->fields[idx];
77aa5901 MD	259	op = (struct load_op *) &runtime->data[reloc_offset];
	260	field_ref = (struct field_ref *) op->data;
	261	switch (ctx_field->event_field.type.atype) {
	262	case atype_integer:
	263	case atype_enum:
	264	op->op = FILTER_OP_GET_CONTEXT_REF_S64;
	265	break;
	266	/* Sequence and array supported as string */
	267	case atype_string:
	268	case atype_array:
	269	case atype_sequence:
	270	op->op = FILTER_OP_GET_CONTEXT_REF_STRING;
	271	break;
	272	case atype_float:
	273	op->op = FILTER_OP_GET_CONTEXT_REF_DOUBLE;
	274	break;
53569322 MD	275	case atype_dynamic:
	276	op->op = FILTER_OP_GET_CONTEXT_REF;
	277	break;
77aa5901 MD	278	default:
	279	return -EINVAL;
	280	}
	281	/* set offset to context index within channel contexts */
	282	field_ref->offset = (uint16_t) idx;
	283	return 0;
	284	}
	285
	286	static
	287	int apply_reloc(struct lttng_event *event,
	288	struct bytecode_runtime *runtime,
	289	uint32_t runtime_len,
	290	uint32_t reloc_offset,
	291	const char *name)
	292	{
	293	struct load_op *op;
	294
	295	dbg_printf("Apply reloc: %u %s\n", reloc_offset, name);
	296
	297	/* Ensure that the reloc is within the code */
	298	if (runtime_len - reloc_offset < sizeof(uint16_t))
	299	return -EINVAL;
	300
	301	op = (struct load_op *) &runtime->data[reloc_offset];
	302	switch (op->op) {
	303	case FILTER_OP_LOAD_FIELD_REF:
	304	return apply_field_reloc(event, runtime, runtime_len,
	305	reloc_offset, name);
	306	case FILTER_OP_GET_CONTEXT_REF:
	307	return apply_context_reloc(event, runtime, runtime_len,
	308	reloc_offset, name);
	309	default:
	310	ERR("Unknown reloc op type %u\n", op->op);
	311	return -EINVAL;
	312	}
	313	return 0;
	314	}
	315
f488575f MD	316	static
f488575f MD	317	int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
7dd08bec	318	struct lttng_event *event)
f488575f MD	319	{
	320	struct lttng_bytecode_runtime *bc_runtime;
	321
e58095ef MD	322	cds_list_for_each_entry(bc_runtime,
e58095ef MD	323	&event->bytecode_runtime_head, node) {
f488575f MD	324	if (bc_runtime->bc == filter_bytecode)
	325	return 1;
	326	}
	327	return 0;
	328	}
	329
cd54f6d9 MD	330	/*
	331	* Take a bytecode with reloc table and link it to an event to create a
	332	* bytecode runtime.
	333	*/
2d78951a	334	static
7dd08bec	335	int _lttng_filter_event_link_bytecode(struct lttng_event *event,
e58095ef MD	336	struct lttng_ust_filter_bytecode_node *filter_bytecode,
e58095ef MD	337	struct cds_list_head *insert_loc)
2d78951a	338	{
cd54f6d9 MD	339	int ret, offset, next_offset;
	340	struct bytecode_runtime *runtime = NULL;
	341	size_t runtime_alloc_len;
	342
2d78951a MD	343	if (!filter_bytecode)
2d78951a MD	344	return 0;
cd54f6d9	345	/* Bytecode already linked */
f488575f	346	if (bytecode_is_linked(filter_bytecode, event))
cd54f6d9	347	return 0;
2d78951a	348
f488575f	349	dbg_printf("Linking...\n");
cd54f6d9 MD	350
cd54f6d9 MD	351	/* We don't need the reloc table in the runtime */
f488575f	352	runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
cd54f6d9 MD	353	runtime = zmalloc(runtime_alloc_len);
	354	if (!runtime) {
	355	ret = -ENOMEM;
e0a7d7ab	356	goto alloc_error;
cd54f6d9	357	}
f488575f	358	runtime->p.bc = filter_bytecode;
53569322	359	runtime->p.session = event->chan->session;
f488575f	360	runtime->len = filter_bytecode->bc.reloc_offset;
cd54f6d9	361	/* copy original bytecode */
f488575f	362	memcpy(runtime->data, filter_bytecode->bc.data, runtime->len);
cd54f6d9 MD	363	/*
	364	* apply relocs. Those are a uint16_t (offset in bytecode)
	365	* followed by a string (field name).
	366	*/
f488575f MD	367	for (offset = filter_bytecode->bc.reloc_offset;
f488575f MD	368	offset < filter_bytecode->bc.len;
cd54f6d9 MD	369	offset = next_offset) {
cd54f6d9 MD	370	uint16_t reloc_offset =
f488575f	371	(uint16_t ) &filter_bytecode->bc.data[offset];
77aa5901	372	const char *name =
f488575f	373	(const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];
cd54f6d9	374
77aa5901	375	ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name);
cd54f6d9 MD	376	if (ret) {
	377	goto link_error;
	378	}
77aa5901	379	next_offset = offset + sizeof(uint16_t) + strlen(name) + 1;
cd54f6d9	380	}
9522a886 MD	381	/* Validate bytecode */
	382	ret = lttng_filter_validate_bytecode(runtime);
	383	if (ret) {
	384	goto link_error;
	385	}
08c84b15 MD	386	/* Specialize bytecode */
	387	ret = lttng_filter_specialize_bytecode(runtime);
	388	if (ret) {
	389	goto link_error;
	390	}
f488575f	391	runtime->p.filter = lttng_filter_interpret_bytecode;
21af05a9	392	runtime->p.link_failed = 0;
e58095ef	393	cds_list_add_rcu(&runtime->p.node, insert_loc);
f488575f	394	dbg_printf("Linking successful.\n");
2d78951a	395	return 0;
cd54f6d9 MD	396
cd54f6d9 MD	397	link_error:
f488575f	398	runtime->p.filter = lttng_filter_false;
21af05a9	399	runtime->p.link_failed = 1;
e58095ef	400	cds_list_add_rcu(&runtime->p.node, insert_loc);
e0a7d7ab	401	alloc_error:
f488575f	402	dbg_printf("Linking failed.\n");
cd54f6d9	403	return ret;
2d78951a MD	404	}
2d78951a MD	405
e58095ef	406	void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
2d78951a	407	{
e58095ef	408	struct lttng_ust_filter_bytecode_node *bc = runtime->bc;
f488575f	409
21af05a9	410	if (!bc->enabler->enabled \|\| runtime->link_failed)
e58095ef	411	runtime->filter = lttng_filter_false;
21af05a9 MD	412	else
21af05a9 MD	413	runtime->filter = lttng_filter_interpret_bytecode;
2d78951a MD	414	}
	415
	416	/*
e58095ef	417	* Link bytecode for all enablers referenced by an event.
2d78951a	418	*/
e58095ef MD	419	void lttng_enabler_event_link_bytecode(struct lttng_event *event,
e58095ef MD	420	struct lttng_enabler *enabler)
2d78951a	421	{
e58095ef MD	422	struct lttng_ust_filter_bytecode_node *bc;
	423	struct lttng_bytecode_runtime *runtime;
	424
	425	/* Can only be called for events with desc attached */
	426	assert(event->desc);
	427
	428	/* Link each bytecode. */
	429	cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
	430	int found = 0, ret;
	431	struct cds_list_head *insert_loc;
	432
	433	cds_list_for_each_entry(runtime,
	434	&event->bytecode_runtime_head, node) {
	435	if (runtime->bc == bc) {
	436	found = 1;
	437	break;
	438	}
	439	}
	440	/* Skip bytecode already linked */
	441	if (found)
	442	continue;
	443
	444	/*
	445	* Insert at specified priority (seqnum) in increasing
	446	* order.
	447	*/
	448	cds_list_for_each_entry_reverse(runtime,
	449	&event->bytecode_runtime_head, node) {
	450	if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
	451	/* insert here */
	452	insert_loc = &runtime->node;
	453	goto add_within;
	454	}
	455	}
	456	/* Add to head to list */
	457	insert_loc = &event->bytecode_runtime_head;
	458	add_within:
f488575f	459	dbg_printf("linking bytecode\n");
e58095ef MD	460	ret = _lttng_filter_event_link_bytecode(event, bc,
	461	insert_loc);
	462	if (ret) {
	463	dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
	464	}
2d78951a	465	}
2d78951a MD	466	}
	467
	468	/*
e58095ef	469	* We own the filter_bytecode if we return success.
2d78951a	470	*/
e58095ef	471	int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
f488575f	472	struct lttng_ust_filter_bytecode_node *filter_bytecode)
2d78951a	473	{
e58095ef	474	cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
2d78951a MD	475	return 0;
2d78951a MD	476	}
f488575f	477
e58095ef	478	void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
f488575f MD	479	{
	480	struct lttng_ust_filter_bytecode_node filter_bytecode, tmp;
	481
	482	cds_list_for_each_entry_safe(filter_bytecode, tmp,
e58095ef	483	&enabler->filter_bytecode_head, node) {
f488575f MD	484	free(filter_bytecode);
	485	}
	486	}
	487
7dd08bec	488	void lttng_free_event_filter_runtime(struct lttng_event *event)
f488575f MD	489	{
	490	struct bytecode_runtime runtime, tmp;
	491
	492	cds_list_for_each_entry_safe(runtime, tmp,
e58095ef	493	&event->bytecode_runtime_head, p.node) {
f488575f MD	494	free(runtime);
	495	}
	496	}