+++ /dev/null
-/*
- * 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 <errno.h>
-#include <stdio.h>
-#include <helper.h>
-#include <lttng/ust-events.h>
-#include <stdint.h>
-#include <errno.h>
-#include <string.h>
-#include <inttypes.h>
-#include <limits.h>
-#include "filter-bytecode.h"
-
-#define NR_REG 2
-
-#ifndef min_t
-#define min_t(type, a, b) \
- ((type) (a) < (type) (b) ? (type) (a) : (type) (b))
-#endif
-
-#ifndef likely
-#define likely(x) __builtin_expect(!!(x), 1)
-#endif
-
-#ifndef unlikely
-#define unlikely(x) __builtin_expect(!!(x), 0)
-#endif
-
-#ifdef DEBUG
-#define dbg_printf(fmt, args...) printf("[debug bytecode] " fmt, ## args)
-#else
-#define dbg_printf(fmt, args...) \
-do { \
- /* do nothing but check printf format */ \
- if (0) \
- printf("[debug bytecode] " fmt, ## args); \
-} while (0)
-#endif
-
-/* Linked bytecode */
-struct bytecode_runtime {
- uint16_t len;
- char data[0];
-};
-
-struct reg {
- enum {
- REG_S64,
- REG_STRING, /* NULL-terminated string */
- REG_SEQUENCE, /* non-null terminated */
- } type;
- int64_t v;
-
- const char *str;
- size_t seq_len;
- int literal; /* is string literal ? */
-};
-
-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",
- [ FILTER_OP_EQ ] = "EQ",
- [ FILTER_OP_NE ] = "NE",
- [ FILTER_OP_GT ] = "GT",
- [ FILTER_OP_LT ] = "LT",
- [ FILTER_OP_GE ] = "GE",
- [ FILTER_OP_LE ] = "LE",
-
- /* unary */
- [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
- [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
- [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
-
- /* logical */
- [ FILTER_OP_AND ] = "AND",
- [ FILTER_OP_OR ] = "OR",
-
- /* load */
- [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
- [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
- [ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
-};
-
-static
-const char *print_op(enum filter_op op)
-{
- if (op >= NR_FILTER_OPS)
- return "UNKNOWN";
- else
- return opnames[op];
-}
-
-/*
- * -1: wildcard found.
- * -2: unknown escape char.
- * 0: normal char.
- */
-
-static
-int parse_char(const char **p)
-{
- switch (**p) {
- case '\\':
- (*p)++;
- switch (**p) {
- case '\\':
- case '*':
- return 0;
- default:
- return -2;
- }
- case '*':
- return -1;
- default:
- return 0;
- }
-}
-
-static
-int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type)
-{
- const char *p = reg[REG_R0].str, *q = reg[REG_R1].str;
- int ret;
- int diff;
-
- for (;;) {
- int escaped_r0 = 0;
-
- if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) {
- if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')
- diff = 0;
- else
- diff = -1;
- break;
- }
- if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) {
- if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')
- diff = 0;
- else
- diff = 1;
- break;
- }
- if (reg[REG_R0].literal) {
- ret = parse_char(&p);
- if (ret == -1) {
- return 0;
- } else if (ret == -2) {
- escaped_r0 = 1;
- }
- /* else compare both char */
- }
- if (reg[REG_R1].literal) {
- ret = parse_char(&q);
- if (ret == -1) {
- return 0;
- } else if (ret == -2) {
- if (!escaped_r0)
- return -1;
- } else {
- if (escaped_r0)
- return 1;
- }
- } else {
- if (escaped_r0)
- return 1;
- }
- diff = *p - *q;
- if (diff != 0)
- break;
- p++;
- q++;
- }
- return diff;
-}
-
-static
-int lttng_filter_false(void *filter_data,
- const char *filter_stack_data)
-{
- return 0;
-}
-
-static
-int lttng_filter_interpret_bytecode(void *filter_data,
- const char *filter_stack_data)
-{
- struct bytecode_runtime *bytecode = filter_data;
- void *pc, *next_pc, *start_pc;
- int ret = -EINVAL;
- int retval = 0;
- struct reg reg[NR_REG];
- int i;
-
- for (i = 0; i < NR_REG; i++) {
- reg[i].type = REG_S64;
- reg[i].v = 0;
- reg[i].str = NULL;
- reg[i].seq_len = 0;
- reg[i].literal = 0;
- }
-
- start_pc = &bytecode->data[0];
- for (pc = next_pc = start_pc; pc - start_pc < bytecode->len;
- pc = next_pc) {
- if (unlikely(pc >= start_pc + bytecode->len)) {
- fprintf(stderr, "[error] filter bytecode overflow\n");
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("Executing op %s (%u)\n",
- print_op((unsigned int) *(filter_opcode_t *) pc),
- (unsigned int) *(filter_opcode_t *) pc);
- switch (*(filter_opcode_t *) pc) {
- case FILTER_OP_UNKNOWN:
- default:
- fprintf(stderr, "[error] unknown bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- case FILTER_OP_RETURN:
- retval = !!reg[0].v;
- ret = 0;
- goto end;
-
- /* binary */
- case FILTER_OP_MUL:
- case FILTER_OP_DIV:
- case FILTER_OP_MOD:
- case FILTER_OP_PLUS:
- case FILTER_OP_MINUS:
- case FILTER_OP_RSHIFT:
- case FILTER_OP_LSHIFT:
- case FILTER_OP_BIN_AND:
- case FILTER_OP_BIN_OR:
- case FILTER_OP_BIN_XOR:
- fprintf(stderr, "[error] unsupported bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- case FILTER_OP_EQ:
- {
- if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
- || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
- fprintf(stderr, "[error] type mismatch for '==' binary operator\n");
- ret = -EINVAL;
- goto end;
- }
- switch (reg[REG_R0].type) {
- default:
- fprintf(stderr, "[error] unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- case REG_SEQUENCE:
- reg[REG_R0].v = (reg_strcmp(reg, "==") == 0);
- break;
- case REG_S64:
- reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v);
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_NE:
- {
- if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
- || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
- fprintf(stderr, "[error] type mismatch for '!=' binary operator\n");
- ret = -EINVAL;
- goto end;
- }
- switch (reg[REG_R0].type) {
- default:
- fprintf(stderr, "[error] unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- case REG_SEQUENCE:
- reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0);
- break;
- case REG_S64:
- reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v);
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_GT:
- {
- if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
- || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
- fprintf(stderr, "[error] type mismatch for '>' binary operator\n");
- ret = -EINVAL;
- goto end;
- }
- switch (reg[REG_R0].type) {
- default:
- fprintf(stderr, "[error] unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- case REG_SEQUENCE:
- reg[REG_R0].v = (reg_strcmp(reg, ">") > 0);
- break;
- case REG_S64:
- reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v);
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_LT:
- {
- if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
- || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
- fprintf(stderr, "[error] type mismatch for '<' binary operator\n");
- ret = -EINVAL;
- goto end;
- }
- switch (reg[REG_R0].type) {
- default:
- fprintf(stderr, "[error] unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- case REG_SEQUENCE:
- reg[REG_R0].v = (reg_strcmp(reg, "<") < 0);
- break;
- case REG_S64:
- reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v);
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_GE:
- {
- if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
- || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
- fprintf(stderr, "[error] type mismatch for '>=' binary operator\n");
- ret = -EINVAL;
- goto end;
- }
- switch (reg[REG_R0].type) {
- default:
- fprintf(stderr, "[error] unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- case REG_SEQUENCE:
- reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0);
- break;
- case REG_S64:
- reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v);
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_LE:
- {
- if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
- || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
- fprintf(stderr, "[error] type mismatch for '<=' binary operator\n");
- ret = -EINVAL;
- goto end;
- }
- switch (reg[REG_R0].type) {
- default:
- fprintf(stderr, "[error] unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- case REG_SEQUENCE:
- reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0);
- break;
- case REG_S64:
- reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v);
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- /* unary */
- case FILTER_OP_UNARY_PLUS:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- fprintf(stderr, "[error] invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- if (unlikely(reg[insn->reg].type != REG_S64)) {
- fprintf(stderr, "[error] Unary plus can only be applied to numeric register\n");
- ret = -EINVAL;
- goto end;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
- case FILTER_OP_UNARY_MINUS:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- fprintf(stderr, "[error] invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- if (unlikely(reg[insn->reg].type != REG_S64)) {
- fprintf(stderr, "[error] Unary minus can only be applied to numeric register\n");
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].v = -reg[insn->reg].v;
- next_pc += sizeof(struct unary_op);
- break;
- }
- case FILTER_OP_UNARY_NOT:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- fprintf(stderr, "[error] invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- if (unlikely(reg[insn->reg].type != REG_S64)) {
- fprintf(stderr, "[error] Unary not can only be applied to numeric register\n");
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].v = !reg[insn->reg].v;
- next_pc += sizeof(struct unary_op);
- break;
- }
- /* logical */
- case FILTER_OP_AND:
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- if (unlikely(reg[REG_R0].type != REG_S64)) {
- fprintf(stderr, "[error] Logical operator 'and' can only be applied to numeric register\n");
- ret = -EINVAL;
- goto end;
- }
-
- /* If REG_R0 is 0, skip and evaluate to 0 */
- if (reg[REG_R0].v == 0) {
- dbg_printf("Jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- next_pc = start_pc + insn->skip_offset;
- if (unlikely(next_pc <= pc)) {
- fprintf(stderr, "[error] Loops are not allowed in bytecode\n");
- ret = -EINVAL;
- goto end;
- }
- } else {
- next_pc += sizeof(struct logical_op);
- }
- break;
- }
- case FILTER_OP_OR:
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- if (unlikely(reg[REG_R0].type != REG_S64)) {
- fprintf(stderr, "[error] Logical operator 'and' can only be applied to numeric register\n");
- ret = -EINVAL;
- goto end;
- }
-
- /* If REG_R0 is nonzero, skip and evaluate to 1 */
- if (reg[REG_R0].v != 0) {
- reg[REG_R0].v = 1;
- dbg_printf("Jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- next_pc = start_pc + insn->skip_offset;
- if (unlikely(next_pc <= pc)) {
- fprintf(stderr, "[error] Loops are not allowed in bytecode\n");
- ret = -EINVAL;
- goto end;
- }
- } else {
- next_pc += sizeof(struct logical_op);
- }
- break;
- }
-
- /* load */
- case FILTER_OP_LOAD_FIELD_REF:
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- fprintf(stderr, "[error] invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("load field ref offset %u type %u\n",
- ref->offset, ref->type);
- switch (ref->type) {
- case FIELD_REF_UNKNOWN:
- default:
- fprintf(stderr, "[error] unknown field ref type\n");
- ret = -EINVAL;
- goto end;
-
- case FIELD_REF_STRING:
- reg[insn->reg].str =
- *(const char * const *) &filter_stack_data[ref->offset];
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].seq_len = UINT_MAX;
- reg[insn->reg].literal = 0;
- dbg_printf("ref load string %s\n", reg[insn->reg].str);
- break;
- case FIELD_REF_SEQUENCE:
- reg[insn->reg].seq_len =
- *(unsigned long *) &filter_stack_data[ref->offset];
- reg[insn->reg].str =
- *(const char **) (&filter_stack_data[ref->offset
- + sizeof(unsigned long)]);
- reg[insn->reg].type = REG_SEQUENCE;
- reg[insn->reg].literal = 0;
- break;
- case FIELD_REF_S64:
- memcpy(®[insn->reg].v, &filter_stack_data[ref->offset],
- sizeof(struct literal_numeric));
- reg[insn->reg].type = REG_S64;
- reg[insn->reg].literal = 0;
- dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v);
- break;
- }
-
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
-
- case FILTER_OP_LOAD_STRING:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- fprintf(stderr, "[error] invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("load string %s\n", insn->data);
- reg[insn->reg].str = insn->data;
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].seq_len = UINT_MAX;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
- break;
- }
-
- case FILTER_OP_LOAD_S64:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- fprintf(stderr, "[error] invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- memcpy(®[insn->reg].v, insn->data,
- sizeof(struct literal_numeric));
- dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v);
- reg[insn->reg].type = REG_S64;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_numeric);
- break;
- }
- }
- }
-end:
- /* return 0 (discard) on error */
- if (ret)
- return 0;
- return retval;
-}
-
-static
-int apply_field_reloc(struct ltt_event *event,
- struct bytecode_runtime *runtime,
- uint32_t runtime_len,
- uint32_t reloc_offset,
- const char *field_name)
-{
- const struct lttng_event_desc *desc;
- const struct lttng_event_field *fields, *field = NULL;
- unsigned int nr_fields, i;
- struct field_ref *field_ref;
- uint32_t field_offset = 0;
-
- dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name);
-
- /* Ensure that the reloc is within the code */
- if (runtime_len - reloc_offset < sizeof(uint16_t))
- return -EINVAL;
-
- /* Lookup event by name */
- desc = event->desc;
- if (!desc)
- return -EINVAL;
- fields = desc->fields;
- if (!fields)
- return -EINVAL;
- nr_fields = desc->nr_fields;
- for (i = 0; i < nr_fields; i++) {
- if (!strcmp(fields[i].name, field_name)) {
- field = &fields[i];
- break;
- }
- /* compute field offset */
- switch (fields[i].type.atype) {
- case atype_integer:
- case atype_enum:
- field_offset += sizeof(int64_t);
- break;
- case atype_array:
- case atype_sequence:
- field_offset += sizeof(unsigned long);
- field_offset += sizeof(void *);
- break;
- case atype_string:
- field_offset += sizeof(void *);
- break;
- case atype_float:
- field_offset += sizeof(double);
- default:
- return -EINVAL;
- }
- }
- if (!field)
- return -EINVAL;
-
- /* Check if field offset is too large for 16-bit offset */
- if (field_offset > FILTER_BYTECODE_MAX_LEN)
- return -EINVAL;
-
- /* set type */
- field_ref = (struct field_ref *) &runtime->data[reloc_offset];
- switch (field->type.atype) {
- case atype_integer:
- case atype_enum:
- field_ref->type = FIELD_REF_S64;
- field_ref->type = FIELD_REF_S64;
- break;
- case atype_array:
- case atype_sequence:
- field_ref->type = FIELD_REF_SEQUENCE;
- break;
- case atype_string:
- field_ref->type = FIELD_REF_STRING;
- break;
- case atype_float:
- return -EINVAL;
- default:
- return -EINVAL;
- }
- /* set offset */
- field_ref->offset = (uint16_t) field_offset;
- return 0;
-}
-
-/*
- * Take a bytecode with reloc table and link it to an event to create a
- * bytecode runtime.
- */
-static
-int _lttng_filter_event_link_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- int ret, offset, next_offset;
- struct bytecode_runtime *runtime = NULL;
- size_t runtime_alloc_len;
-
- if (!filter_bytecode)
- return 0;
- /* Even is not connected to any description */
- if (!event->desc)
- return 0;
- /* Bytecode already linked */
- if (event->filter || event->filter_data)
- return 0;
-
- dbg_printf("Linking\n");
-
- /* We don't need the reloc table in the runtime */
- runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset;
- runtime = zmalloc(runtime_alloc_len);
- if (!runtime) {
- ret = -ENOMEM;
- goto link_error;
- }
- runtime->len = filter_bytecode->reloc_offset;
- /* copy original bytecode */
- memcpy(runtime->data, filter_bytecode->data, runtime->len);
- /*
- * apply relocs. Those are a uint16_t (offset in bytecode)
- * followed by a string (field name).
- */
- for (offset = filter_bytecode->reloc_offset;
- offset < filter_bytecode->len;
- offset = next_offset) {
- uint16_t reloc_offset =
- *(uint16_t *) &filter_bytecode->data[offset];
- const char *field_name =
- (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)];
-
- ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
- if (ret) {
- goto link_error;
- }
- next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1;
- }
- event->filter_data = runtime;
- event->filter = lttng_filter_interpret_bytecode;
- return 0;
-
-link_error:
- event->filter = lttng_filter_false;
- free(runtime);
- return ret;
-}
-
-void lttng_filter_event_link_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- int ret;
-
- ret = _lttng_filter_event_link_bytecode(event, filter_bytecode);
- if (ret) {
- fprintf(stderr, "[lttng filter] error linking event bytecode\n");
- }
-}
-
-/*
- * Link bytecode to all events for a wildcard. Skips events that already
- * have a bytecode linked.
- * We do not set each event's filter_bytecode field, because they do not
- * own the filter_bytecode: the wildcard owns it.
- */
-void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard)
-{
- struct ltt_event *event;
- int ret;
-
- if (!wildcard->filter_bytecode)
- return;
-
- cds_list_for_each_entry(event, &wildcard->events, wildcard_list) {
- if (event->filter)
- continue;
- ret = _lttng_filter_event_link_bytecode(event,
- wildcard->filter_bytecode);
- if (ret) {
- fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n");
- }
-
- }
- return;
-}
-
-/*
- * Need to attach filter to an event before starting tracing for the
- * session. We own the filter_bytecode if we return success.
- */
-int lttng_filter_event_attach_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- if (event->chan->session->been_active)
- return -EPERM;
- if (event->filter_bytecode)
- return -EEXIST;
- event->filter_bytecode = filter_bytecode;
- return 0;
-}
-
-/*
- * Need to attach filter to a wildcard before starting tracing for the
- * session. We own the filter_bytecode if we return success.
- */
-int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- if (wildcard->chan->session->been_active)
- return -EPERM;
- if (wildcard->filter_bytecode)
- return -EEXIST;
- wildcard->filter_bytecode = filter_bytecode;
- return 0;
-}