liblttng-ust/lttng-filter.h

   1 #ifndef _LTTNG_FILTER_H
   2 #define _LTTNG_FILTER_H
   3
   4 /*
   5  * lttng-filter.h
   6  *
   7  * LTTng UST filter header.
   8  *
   9  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <helper.h>
  29 #include <lttng/ust-events.h>
  30 #include <stdint.h>
  31 #include <errno.h>
  32 #include <string.h>
  33 #include <inttypes.h>
  34 #include <limits.h>
  35 #include <usterr-signal-safe.h>
  36 #include "filter-bytecode.h"
  37
  38 #define NR_REG          2
  39
  40 #ifndef min_t
  41 #define min_t(type, a, b)       \
  42                 ((type) (a) < (type) (b) ? (type) (a) : (type) (b))
  43 #endif
  44
  45 #ifndef likely
  46 #define likely(x)       __builtin_expect(!!(x), 1)
  47 #endif
  48
  49 #ifndef unlikely
  50 #define unlikely(x)     __builtin_expect(!!(x), 0)
  51 #endif
  52
  53 #ifdef DEBUG
  54 #define dbg_printf(fmt, args...)     printf("[debug bytecode] " fmt, ## args)
  55 #else
  56 #define dbg_printf(fmt, args...)                                \
  57 do {                                                            \
  58         /* do nothing but check printf format */                \
  59         if (0)                                                  \
  60                 printf("[debug bytecode] " fmt, ## args);       \
  61 } while (0)
  62 #endif
  63
  64 /* Linked bytecode */
  65 struct bytecode_runtime {
  66         uint16_t len;
  67         char data[0];
  68 };
  69
  70 enum reg_type {
  71         REG_S64,
  72         REG_DOUBLE,
  73         REG_STRING,
  74         REG_TYPE_UNKNOWN,
  75 };
  76
  77 /* Validation registers */
  78 struct vreg {
  79         enum reg_type type;
  80         int literal;            /* is string literal ? */
  81 };
  82
  83 /* Execution registers */
  84 struct reg {
  85         enum reg_type type;
  86         int64_t v;
  87         double d;
  88
  89         const char *str;
  90         size_t seq_len;
  91         int literal;            /* is string literal ? */
  92 };
  93
  94 const char *print_op(enum filter_op op);
  95
  96 int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode);
  97 int lttng_filter_specialize_bytecode(struct bytecode_runtime *bytecode);
  98
  99 int lttng_filter_false(void *filter_data,
 100                 const char *filter_stack_data);
 101 int lttng_filter_interpret_bytecode(void *filter_data,
 102                 const char *filter_stack_data);
 103
 104 #endif /* _LTTNG_FILTER_H */