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97b58163 MD |
1 | #ifndef _LTTNG_FILTER_H |
2 | #define _LTTNG_FILTER_H | |
3 | ||
4 | /* | |
5 | * lttng-filter.h | |
6 | * | |
7 | * LTTng UST filter header. | |
8 | * | |
7e50015d | 9 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
97b58163 | 10 | * |
7e50015d MD |
11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
12 | * of this software and associated documentation files (the "Software"), to deal | |
13 | * in the Software without restriction, including without limitation the rights | |
14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
15 | * copies of the Software, and to permit persons to whom the Software is | |
16 | * furnished to do so, subject to the following conditions: | |
97b58163 | 17 | * |
7e50015d MD |
18 | * The above copyright notice and this permission notice shall be included in |
19 | * all copies or substantial portions of the Software. | |
97b58163 | 20 | * |
7e50015d MD |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
27 | * SOFTWARE. | |
97b58163 MD |
28 | */ |
29 | ||
30 | #include <errno.h> | |
31 | #include <stdio.h> | |
91ad5118 | 32 | #include <stdbool.h> |
97b58163 MD |
33 | #include <helper.h> |
34 | #include <lttng/ust-events.h> | |
53569322 | 35 | #include <lttng/ust-context-provider.h> |
97b58163 | 36 | #include <stdint.h> |
0305960f | 37 | #include <assert.h> |
97b58163 MD |
38 | #include <errno.h> |
39 | #include <string.h> | |
40 | #include <inttypes.h> | |
41 | #include <limits.h> | |
42 | #include <usterr-signal-safe.h> | |
43 | #include "filter-bytecode.h" | |
44 | ||
0305960f | 45 | /* Filter stack length, in number of entries */ |
9b33aac4 MD |
46 | #define FILTER_STACK_LEN 10 /* includes 2 dummy */ |
47 | #define FILTER_STACK_EMPTY 1 | |
97b58163 | 48 | |
47e5f13e MD |
49 | #define FILTER_MAX_DATA_LEN 65536 |
50 | ||
97b58163 MD |
51 | #ifndef min_t |
52 | #define min_t(type, a, b) \ | |
53 | ((type) (a) < (type) (b) ? (type) (a) : (type) (b)) | |
54 | #endif | |
55 | ||
56 | #ifndef likely | |
57 | #define likely(x) __builtin_expect(!!(x), 1) | |
58 | #endif | |
59 | ||
60 | #ifndef unlikely | |
61 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
62 | #endif | |
63 | ||
64 | #ifdef DEBUG | |
f488575f MD |
65 | #define dbg_printf(fmt, args...) \ |
66 | printf("[debug bytecode in %s:%s@%u] " fmt, \ | |
67 | __FILE__, __func__, __LINE__, ## args) | |
97b58163 MD |
68 | #else |
69 | #define dbg_printf(fmt, args...) \ | |
70 | do { \ | |
71 | /* do nothing but check printf format */ \ | |
72 | if (0) \ | |
f488575f MD |
73 | printf("[debug bytecode in %s:%s@%u] " fmt, \ |
74 | __FILE__, __func__, __LINE__, ## args); \ | |
97b58163 MD |
75 | } while (0) |
76 | #endif | |
77 | ||
f488575f | 78 | /* Linked bytecode. Child of struct lttng_bytecode_runtime. */ |
97b58163 | 79 | struct bytecode_runtime { |
f488575f | 80 | struct lttng_bytecode_runtime p; |
47e5f13e MD |
81 | size_t data_len; |
82 | size_t data_alloc_len; | |
83 | char *data; | |
97b58163 | 84 | uint16_t len; |
47e5f13e | 85 | char code[0]; |
97b58163 MD |
86 | }; |
87 | ||
0305960f | 88 | enum entry_type { |
97b58163 MD |
89 | REG_S64, |
90 | REG_DOUBLE, | |
91 | REG_STRING, | |
3151a51d | 92 | REG_STAR_GLOB_STRING, |
53569322 | 93 | REG_UNKNOWN, |
47e5f13e MD |
94 | REG_PTR, |
95 | }; | |
96 | ||
97 | enum load_type { | |
98 | LOAD_ROOT_CONTEXT, | |
99 | LOAD_ROOT_APP_CONTEXT, | |
100 | LOAD_ROOT_PAYLOAD, | |
101 | LOAD_OBJECT, | |
102 | }; | |
103 | ||
104 | enum object_type { | |
105 | OBJECT_TYPE_S8, | |
106 | OBJECT_TYPE_S16, | |
107 | OBJECT_TYPE_S32, | |
108 | OBJECT_TYPE_S64, | |
109 | OBJECT_TYPE_U8, | |
110 | OBJECT_TYPE_U16, | |
111 | OBJECT_TYPE_U32, | |
112 | OBJECT_TYPE_U64, | |
113 | ||
114 | OBJECT_TYPE_DOUBLE, | |
115 | OBJECT_TYPE_STRING, | |
116 | OBJECT_TYPE_STRING_SEQUENCE, | |
117 | ||
118 | OBJECT_TYPE_SEQUENCE, | |
119 | OBJECT_TYPE_ARRAY, | |
120 | OBJECT_TYPE_STRUCT, | |
121 | OBJECT_TYPE_VARIANT, | |
122 | ||
123 | OBJECT_TYPE_DYNAMIC, | |
124 | }; | |
125 | ||
126 | struct filter_get_index_data { | |
127 | uint64_t offset; /* in bytes */ | |
128 | size_t ctx_index; | |
129 | size_t array_len; | |
130 | struct { | |
131 | size_t len; | |
132 | enum object_type type; | |
133 | bool rev_bo; /* reverse byte order */ | |
134 | } elem; | |
97b58163 MD |
135 | }; |
136 | ||
0305960f | 137 | /* Validation stack */ |
47e5f13e MD |
138 | struct vstack_load { |
139 | enum load_type type; | |
140 | enum object_type object_type; | |
141 | const struct lttng_event_field *field; | |
142 | bool rev_bo; /* reverse byte order */ | |
143 | }; | |
144 | ||
0305960f MD |
145 | struct vstack_entry { |
146 | enum entry_type type; | |
47e5f13e | 147 | struct vstack_load load; |
97b58163 MD |
148 | }; |
149 | ||
0305960f MD |
150 | struct vstack { |
151 | int top; /* top of stack */ | |
152 | struct vstack_entry e[FILTER_STACK_LEN]; | |
153 | }; | |
154 | ||
155 | static inline | |
156 | void vstack_init(struct vstack *stack) | |
157 | { | |
158 | stack->top = -1; | |
159 | } | |
160 | ||
161 | static inline | |
162 | struct vstack_entry *vstack_ax(struct vstack *stack) | |
163 | { | |
164 | if (unlikely(stack->top < 0)) | |
165 | return NULL; | |
166 | return &stack->e[stack->top]; | |
167 | } | |
168 | ||
169 | static inline | |
170 | struct vstack_entry *vstack_bx(struct vstack *stack) | |
171 | { | |
172 | if (unlikely(stack->top < 1)) | |
173 | return NULL; | |
174 | return &stack->e[stack->top - 1]; | |
175 | } | |
176 | ||
177 | static inline | |
178 | int vstack_push(struct vstack *stack) | |
179 | { | |
180 | if (stack->top >= FILTER_STACK_LEN - 1) { | |
181 | ERR("Stack full\n"); | |
182 | return -EINVAL; | |
183 | } | |
184 | ++stack->top; | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static inline | |
189 | int vstack_pop(struct vstack *stack) | |
190 | { | |
191 | if (unlikely(stack->top < 0)) { | |
192 | ERR("Stack empty\n"); | |
193 | return -EINVAL; | |
194 | } | |
195 | stack->top--; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* Execution stack */ | |
3151a51d PP |
200 | enum estack_string_literal_type { |
201 | ESTACK_STRING_LITERAL_TYPE_NONE, | |
202 | ESTACK_STRING_LITERAL_TYPE_PLAIN, | |
203 | ESTACK_STRING_LITERAL_TYPE_STAR_GLOB, | |
204 | }; | |
205 | ||
47e5f13e MD |
206 | struct load_ptr { |
207 | enum load_type type; | |
208 | enum object_type object_type; | |
209 | const void *ptr; | |
210 | bool rev_bo; | |
211 | /* Temporary place-holders for contexts. */ | |
212 | union { | |
213 | int64_t s64; | |
214 | uint64_t u64; | |
215 | double d; | |
216 | } u; | |
217 | /* | |
218 | * "field" is only needed when nested under a variant, in which | |
219 | * case we cannot specialize the nested operations. | |
220 | */ | |
221 | const struct lttng_event_field *field; | |
222 | }; | |
223 | ||
0305960f | 224 | struct estack_entry { |
53569322 | 225 | enum entry_type type; /* For dynamic typing. */ |
0305960f MD |
226 | union { |
227 | int64_t v; | |
228 | double d; | |
229 | ||
230 | struct { | |
231 | const char *str; | |
9b33aac4 | 232 | size_t seq_len; |
3151a51d | 233 | enum estack_string_literal_type literal_type; |
0305960f | 234 | } s; |
47e5f13e | 235 | struct load_ptr ptr; |
0305960f MD |
236 | } u; |
237 | }; | |
97b58163 | 238 | |
0305960f MD |
239 | struct estack { |
240 | int top; /* top of stack */ | |
241 | struct estack_entry e[FILTER_STACK_LEN]; | |
97b58163 MD |
242 | }; |
243 | ||
53569322 MD |
244 | /* |
245 | * Always use aliased type for ax/bx (top of stack). | |
246 | * When ax/bx are S64, use aliased value. | |
247 | */ | |
9b33aac4 MD |
248 | #define estack_ax_v ax |
249 | #define estack_bx_v bx | |
53569322 MD |
250 | #define estack_ax_t ax_t |
251 | #define estack_bx_t bx_t | |
9b33aac4 | 252 | |
53569322 MD |
253 | /* |
254 | * ax and bx registers can hold either integer, double or string. | |
255 | */ | |
9b33aac4 MD |
256 | #define estack_ax(stack, top) \ |
257 | ({ \ | |
258 | assert((top) > FILTER_STACK_EMPTY); \ | |
259 | &(stack)->e[top]; \ | |
260 | }) | |
261 | ||
262 | #define estack_bx(stack, top) \ | |
263 | ({ \ | |
264 | assert((top) > FILTER_STACK_EMPTY + 1); \ | |
265 | &(stack)->e[(top) - 1]; \ | |
266 | }) | |
267 | ||
53569322 MD |
268 | /* |
269 | * Currently, only integers (REG_S64) can be pushed into the stack. | |
270 | */ | |
271 | #define estack_push(stack, top, ax, bx, ax_t, bx_t) \ | |
9b33aac4 MD |
272 | do { \ |
273 | assert((top) < FILTER_STACK_LEN - 1); \ | |
274 | (stack)->e[(top) - 1].u.v = (bx); \ | |
53569322 | 275 | (stack)->e[(top) - 1].type = (bx_t); \ |
9b33aac4 | 276 | (bx) = (ax); \ |
53569322 | 277 | (bx_t) = (ax_t); \ |
9b33aac4 MD |
278 | ++(top); \ |
279 | } while (0) | |
280 | ||
53569322 | 281 | #define estack_pop(stack, top, ax, bx, ax_t, bx_t) \ |
9b33aac4 MD |
282 | do { \ |
283 | assert((top) > FILTER_STACK_EMPTY); \ | |
284 | (ax) = (bx); \ | |
53569322 | 285 | (ax_t) = (bx_t); \ |
9b33aac4 | 286 | (bx) = (stack)->e[(top) - 2].u.v; \ |
53569322 | 287 | (bx_t) = (stack)->e[(top) - 2].type; \ |
9b33aac4 MD |
288 | (top)--; \ |
289 | } while (0) | |
0305960f | 290 | |
97b58163 MD |
291 | const char *print_op(enum filter_op op); |
292 | ||
293 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode); | |
47e5f13e MD |
294 | int lttng_filter_specialize_bytecode(struct lttng_event *event, |
295 | struct bytecode_runtime *bytecode); | |
97b58163 | 296 | |
8a92ed2a | 297 | uint64_t lttng_filter_false(void *filter_data, |
97b58163 | 298 | const char *filter_stack_data); |
8a92ed2a | 299 | uint64_t lttng_filter_interpret_bytecode(void *filter_data, |
97b58163 MD |
300 | const char *filter_stack_data); |
301 | ||
302 | #endif /* _LTTNG_FILTER_H */ |