liblttng-ust/filter-bytecode.h

   1 #ifndef _FILTER_BYTECODE_H
   2 #define _FILTER_BYTECODE_H
   3
   4 /*
   5  * filter-bytecode.h
   6  *
   7  * LTTng filter bytecode
   8  *
   9  * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU Lesser General Public License, version 2.1 only,
  13  * as published by the Free Software Foundation.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this library; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #include <lttng/ust-abi.h>
  26
  27 /*
  28  * offsets are absolute from start of bytecode.
  29  */
  30
  31 enum filter_register {
  32         REG_R0 = 0,
  33         REG_R1 = 1,
  34         REG_ERROR,
  35 };
  36
  37 enum field_ref_type {
  38         FIELD_REF_UNKNOWN = 0,
  39         FIELD_REF_STRING,
  40         FIELD_REF_SEQUENCE,
  41         FIELD_REF_S64,
  42         FIELD_REF_DOUBLE,
  43 };
  44
  45 struct field_ref {
  46         /* Initially, symbol offset. After link, field offset. */
  47         uint16_t offset;
  48         uint8_t type;   /* enum field_ref_type */
  49 } __attribute__((packed));
  50
  51 struct literal_numeric {
  52         int64_t v;
  53 } __attribute__((packed));
  54
  55 struct literal_double {
  56         double v;
  57 } __attribute__((packed));
  58
  59 struct literal_string {
  60         char string[0];
  61 } __attribute__((packed));
  62
  63 enum filter_op {
  64         FILTER_OP_UNKNOWN = 0,
  65
  66         FILTER_OP_RETURN,
  67
  68         /* binary */
  69         FILTER_OP_MUL,
  70         FILTER_OP_DIV,
  71         FILTER_OP_MOD,
  72         FILTER_OP_PLUS,
  73         FILTER_OP_MINUS,
  74         FILTER_OP_RSHIFT,
  75         FILTER_OP_LSHIFT,
  76         FILTER_OP_BIN_AND,
  77         FILTER_OP_BIN_OR,
  78         FILTER_OP_BIN_XOR,
  79         FILTER_OP_EQ,
  80         FILTER_OP_NE,
  81         FILTER_OP_GT,
  82         FILTER_OP_LT,
  83         FILTER_OP_GE,
  84         FILTER_OP_LE,
  85
  86         /* unary */
  87         FILTER_OP_UNARY_PLUS,
  88         FILTER_OP_UNARY_MINUS,
  89         FILTER_OP_UNARY_NOT,
  90
  91         /* logical */
  92         FILTER_OP_AND,
  93         FILTER_OP_OR,
  94
  95         /* load */
  96         FILTER_OP_LOAD_FIELD_REF,
  97         FILTER_OP_LOAD_STRING,
  98         FILTER_OP_LOAD_S64,
  99         FILTER_OP_LOAD_DOUBLE,
 100
 101         NR_FILTER_OPS,
 102 };
 103
 104 typedef uint8_t filter_opcode_t;
 105
 106 struct load_op {
 107         filter_opcode_t op;
 108         uint8_t reg;            /* enum filter_register */
 109         char data[0];
 110         /* data to load. Size known by enum filter_opcode and null-term char. */
 111 } __attribute__((packed));
 112
 113 struct binary_op {
 114         filter_opcode_t op;
 115 } __attribute__((packed));
 116
 117 struct unary_op {
 118         filter_opcode_t op;
 119         uint8_t reg;            /* enum filter_register */
 120 } __attribute__((packed));
 121
 122 /* skip_offset is absolute from start of bytecode */
 123 struct logical_op {
 124         filter_opcode_t op;
 125         uint16_t skip_offset;   /* bytecode insn, if skip second test */
 126 } __attribute__((packed));
 127
 128 struct return_op {
 129         filter_opcode_t op;
 130 } __attribute__((packed));
 131
 132 #endif /* _FILTER_BYTECODE_H */