src/lib/lttng-ctl/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 "filter-ast.h"
  26 #include "../../common/sessiond-comm/sessiond-comm.h"
  27
  28 /*
  29  * offsets are absolute from start of bytecode.
  30  */
  31
  32 enum filter_register {
  33         REG_R0 = 0,
  34         REG_R1 = 1,
  35         REG_ERROR,
  36 };
  37
  38 struct field_ref {
  39         /* Initially, symbol offset. After link, field offset. */
  40         uint16_t offset;
  41 } __attribute__((packed));
  42
  43 struct literal_numeric {
  44         int64_t v;
  45 } __attribute__((packed));
  46
  47 struct literal_double {
  48         double v;
  49 } __attribute__((packed));
  50
  51 struct literal_string {
  52         char string[0];
  53 } __attribute__((packed));
  54
  55 enum filter_op {
  56         FILTER_OP_UNKNOWN = 0,
  57
  58         FILTER_OP_RETURN,
  59
  60         /* binary */
  61         FILTER_OP_MUL,
  62         FILTER_OP_DIV,
  63         FILTER_OP_MOD,
  64         FILTER_OP_PLUS,
  65         FILTER_OP_MINUS,
  66         FILTER_OP_RSHIFT,
  67         FILTER_OP_LSHIFT,
  68         FILTER_OP_BIN_AND,
  69         FILTER_OP_BIN_OR,
  70         FILTER_OP_BIN_XOR,
  71         FILTER_OP_EQ,
  72         FILTER_OP_NE,
  73         FILTER_OP_GT,
  74         FILTER_OP_LT,
  75         FILTER_OP_GE,
  76         FILTER_OP_LE,
  77
  78         /* unary */
  79         FILTER_OP_UNARY_PLUS,
  80         FILTER_OP_UNARY_MINUS,
  81         FILTER_OP_UNARY_NOT,
  82
  83         /* logical */
  84         FILTER_OP_AND,
  85         FILTER_OP_OR,
  86
  87         /* load */
  88         FILTER_OP_LOAD_FIELD_REF,
  89         FILTER_OP_LOAD_FIELD_REF_STRING,
  90         FILTER_OP_LOAD_FIELD_REF_SEQUENCE,
  91         FILTER_OP_LOAD_FIELD_REF_S64,
  92         FILTER_OP_LOAD_FIELD_REF_DOUBLE,
  93
  94         FILTER_OP_LOAD_STRING,
  95         FILTER_OP_LOAD_S64,
  96         FILTER_OP_LOAD_DOUBLE,
  97
  98         NR_FILTER_OPS,
  99 };
 100
 101 typedef uint8_t filter_opcode_t;
 102
 103 struct load_op {
 104         filter_opcode_t op;
 105         uint8_t reg;            /* enum filter_register */
 106         char data[0];
 107         /* data to load. Size known by enum filter_opcode and null-term char. */
 108 } __attribute__((packed));
 109
 110 struct binary_op {
 111         filter_opcode_t op;
 112 } __attribute__((packed));
 113
 114 struct unary_op {
 115         filter_opcode_t op;
 116         uint8_t reg;            /* enum filter_register */
 117 } __attribute__((packed));
 118
 119 /* skip_offset is absolute from start of bytecode */
 120 struct logical_op {
 121         filter_opcode_t op;
 122         uint16_t skip_offset;   /* bytecode insn, if skip second test */
 123 } __attribute__((packed));
 124
 125 struct return_op {
 126         filter_opcode_t op;
 127 } __attribute__((packed));
 128
 129 struct lttng_filter_bytecode_alloc {
 130         uint16_t alloc_len;
 131         struct lttng_filter_bytecode b;
 132 };
 133
 134 static inline
 135 unsigned int bytecode_get_len(struct lttng_filter_bytecode *bytecode)
 136 {
 137         return bytecode->len;
 138 }
 139
 140 #endif /* _FILTER_BYTECODE_H */