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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 | ||
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 | }; | |
43 | ||
44 | struct field_ref { | |
45 | /* Initially, symbol offset. After link, field offset. */ | |
46 | uint16_t offset; | |
47 | uint8_t type; /* enum field_ref_type */ | |
48 | } __attribute__((packed)); | |
49 | ||
50 | struct literal_numeric { | |
51 | int64_t v; | |
52 | } __attribute__((packed)); | |
53 | ||
54 | struct literal_string { | |
55 | char string[0]; | |
56 | } __attribute__((packed)); | |
57 | ||
58 | enum filter_op { | |
59 | FILTER_OP_UNKNOWN = 0, | |
60 | ||
61 | FILTER_OP_RETURN, | |
62 | ||
63 | /* binary */ | |
64 | FILTER_OP_MUL, | |
65 | FILTER_OP_DIV, | |
66 | FILTER_OP_MOD, | |
67 | FILTER_OP_PLUS, | |
68 | FILTER_OP_MINUS, | |
69 | FILTER_OP_RSHIFT, | |
70 | FILTER_OP_LSHIFT, | |
71 | FILTER_OP_BIN_AND, | |
72 | FILTER_OP_BIN_OR, | |
73 | FILTER_OP_BIN_XOR, | |
74 | FILTER_OP_EQ, | |
75 | FILTER_OP_NE, | |
76 | FILTER_OP_GT, | |
77 | FILTER_OP_LT, | |
78 | FILTER_OP_GE, | |
79 | FILTER_OP_LE, | |
80 | ||
81 | /* unary */ | |
82 | FILTER_OP_UNARY_PLUS, | |
83 | FILTER_OP_UNARY_MINUS, | |
84 | FILTER_OP_UNARY_NOT, | |
85 | ||
86 | /* logical */ | |
87 | FILTER_OP_AND, | |
88 | FILTER_OP_OR, | |
89 | ||
90 | /* load */ | |
91 | FILTER_OP_LOAD_FIELD_REF, | |
92 | FILTER_OP_LOAD_STRING, | |
93 | FILTER_OP_LOAD_S64, | |
94 | ||
95 | NR_FILTER_OPS, | |
96 | }; | |
97 | ||
98 | typedef uint8_t filter_opcode_t; | |
99 | ||
100 | struct load_op { | |
101 | filter_opcode_t op; | |
102 | uint8_t reg; /* enum filter_register */ | |
103 | char data[0]; | |
104 | /* data to load. Size known by enum filter_opcode and null-term char. */ | |
105 | } __attribute__((packed)); | |
106 | ||
107 | struct binary_op { | |
108 | filter_opcode_t op; | |
109 | } __attribute__((packed)); | |
110 | ||
111 | struct unary_op { | |
112 | filter_opcode_t op; | |
113 | uint8_t reg; /* enum filter_register */ | |
114 | } __attribute__((packed)); | |
115 | ||
116 | /* skip_offset is absolute from start of bytecode */ | |
117 | struct logical_op { | |
118 | filter_opcode_t op; | |
119 | uint16_t skip_offset; /* bytecode insn, if skip second test */ | |
120 | } __attribute__((packed)); | |
121 | ||
122 | struct return_op { | |
123 | filter_opcode_t op; | |
124 | } __attribute__((packed)); | |
125 | ||
126 | /* | |
127 | * The reloc table is located at the end of the bytecode. It is made of | |
128 | * tuples: (uint16_t, var. len. string). It starts at | |
129 | * reloc_table_offset. | |
130 | */ | |
131 | struct filter_bytecode { | |
132 | uint16_t len; | |
133 | uint16_t reloc_table_offset; | |
134 | char data[0]; | |
135 | }; | |
136 | ||
137 | struct filter_bytecode_alloc { | |
138 | uint16_t alloc_len; | |
139 | struct filter_bytecode b; | |
140 | }; | |
141 | ||
142 | static inline | |
143 | unsigned int bytecode_get_len(struct filter_bytecode *bytecode) | |
144 | { | |
145 | return bytecode->len; | |
146 | } | |
147 | ||
148 | #endif /* _FILTER_BYTECODE_H */ |