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1 | #ifndef FILTER_H |
2 | #define FILTER_H |
3 | |
4 | /* A filter expression consists in nested AND, OR and NOT expressions |
5 | involving boolean relation (>, >=, =, !=, <, <=) between event fields and |
6 | specific values. It is compiled into an efficient data structure which |
7 | is used in functions to check if a given event or tracefile satisfies the |
8 | filter. |
9 | |
10 | The grammar for filters is: |
11 | |
12 | filter = expression |
13 | |
14 | expression = "(" expression ")" | "!" expression | |
15 | expression "&&" expression | expression "||" expression | |
16 | simpleExpression |
17 | |
18 | simpleExpression = fieldPath op value |
19 | |
20 | fieldPath = fieldComponent [ "." fieldPath ] |
21 | |
22 | fieldComponent = name [ "[" integer "]" ] |
23 | |
24 | value = integer | double | string |
25 | |
26 | */ |
27 | |
28 | |
29 | typedef struct _lttv_filter lttv_filter; |
30 | |
31 | |
32 | /* Compile the filter expression into an efficient data structure */ |
33 | |
34 | lttv_filter *lttv_filter_new(char *expression, lttv_trace *t); |
35 | |
36 | |
37 | /* Check if the tracefile or event satisfies the filter. The arguments are |
38 | declared as void * to allow these functions to be used as hooks. */ |
39 | |
40 | bool lttv_filter_tracefile(void *filter, void *tracefile); |
41 | |
42 | bool lttv_filter_event(void *filter, void *event); |
43 | |
44 | #endif // FILTER_H |
45 | |