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 struct field_ref {
  38         /* Initially, symbol offset. After link, field offset. */
  39         uint16_t offset;
  40 } __attribute__((packed));
  41
  42 struct literal_numeric {
  43         int64_t v;
  44 } __attribute__((packed));
  45
  46 struct literal_double {
  47         double v;
  48 } __attribute__((packed));
  49
  50 struct literal_string {
  51         char string[0];
  52 } __attribute__((packed));
  53
  54 enum filter_op {
  55         FILTER_OP_UNKNOWN = 0,
  56
  57         FILTER_OP_RETURN,
  58
  59         /* binary */
  60         FILTER_OP_MUL,
  61         FILTER_OP_DIV,
  62         FILTER_OP_MOD,
  63         FILTER_OP_PLUS,
  64         FILTER_OP_MINUS,
  65         FILTER_OP_RSHIFT,
  66         FILTER_OP_LSHIFT,
  67         FILTER_OP_BIN_AND,
  68         FILTER_OP_BIN_OR,
  69         FILTER_OP_BIN_XOR,
  70         FILTER_OP_EQ,
  71         FILTER_OP_NE,
  72         FILTER_OP_GT,
  73         FILTER_OP_LT,
  74         FILTER_OP_GE,
  75         FILTER_OP_LE,
  76
  77         /* unary */
  78         FILTER_OP_UNARY_PLUS,
  79         FILTER_OP_UNARY_MINUS,
  80         FILTER_OP_UNARY_NOT,
  81
  82         /* logical */
  83         FILTER_OP_AND,
  84         FILTER_OP_OR,
  85
  86         /* load */
  87         FILTER_OP_LOAD_FIELD_REF,
  88         FILTER_OP_LOAD_FIELD_REF_STRING,
  89         FILTER_OP_LOAD_FIELD_REF_SEQUENCE,
  90         FILTER_OP_LOAD_FIELD_REF_S64,
  91         FILTER_OP_LOAD_FIELD_REF_DOUBLE,
  92
  93         FILTER_OP_LOAD_STRING,
  94         FILTER_OP_LOAD_S64,
  95         FILTER_OP_LOAD_DOUBLE,
  96
  97         NR_FILTER_OPS,
  98 };
  99
 100 typedef uint8_t filter_opcode_t;
 101
 102 struct load_op {
 103         filter_opcode_t op;
 104         uint8_t reg;            /* enum filter_register */
 105         char data[0];
 106         /* data to load. Size known by enum filter_opcode and null-term char. */
 107 } __attribute__((packed));
 108
 109 struct binary_op {
 110         filter_opcode_t op;
 111 } __attribute__((packed));
 112
 113 struct unary_op {
 114         filter_opcode_t op;
 115         uint8_t reg;            /* enum filter_register */
 116 } __attribute__((packed));
 117
 118 /* skip_offset is absolute from start of bytecode */
 119 struct logical_op {
 120         filter_opcode_t op;
 121         uint16_t skip_offset;   /* bytecode insn, if skip second test */
 122 } __attribute__((packed));
 123
 124 struct return_op {
 125         filter_opcode_t op;
 126 } __attribute__((packed));
 127
 128 #endif /* _FILTER_BYTECODE_H */