| 1 | /* This file is part of the Linux Trace Toolkit viewer |
| 2 | * Copyright (C) 2003-2004 Michel Dagenais |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License Version 2 as |
| 6 | * published by the Free Software Foundation; |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software |
| 15 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 16 | * MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #ifndef FILTER_H |
| 20 | #define FILTER_H |
| 21 | |
| 22 | /* A filter expression consists in nested AND, OR and NOT expressions |
| 23 | involving boolean relation (>, >=, =, !=, <, <=) between event fields and |
| 24 | specific values. It is compiled into an efficient data structure which |
| 25 | is used in functions to check if a given event or tracefile satisfies the |
| 26 | filter. |
| 27 | |
| 28 | The grammar for filters is: |
| 29 | |
| 30 | filter = expression |
| 31 | |
| 32 | expression = "(" expression ")" | "!" expression | |
| 33 | expression "&&" expression | expression "||" expression | |
| 34 | simpleExpression |
| 35 | |
| 36 | simpleExpression = fieldPath op value |
| 37 | |
| 38 | fieldPath = fieldComponent [ "." fieldPath ] |
| 39 | |
| 40 | fieldComponent = name [ "[" integer "]" ] |
| 41 | |
| 42 | value = integer | double | string |
| 43 | |
| 44 | */ |
| 45 | |
| 46 | |
| 47 | typedef struct _lttv_filter lttv_filter; |
| 48 | |
| 49 | |
| 50 | /* Compile the filter expression into an efficient data structure */ |
| 51 | |
| 52 | lttv_filter *lttv_filter_new(char *expression, lttv_trace *t); |
| 53 | |
| 54 | |
| 55 | /* Check if the tracefile or event satisfies the filter. The arguments are |
| 56 | declared as void * to allow these functions to be used as hooks. */ |
| 57 | |
| 58 | bool lttv_filter_tracefile(void *filter, void *tracefile); |
| 59 | |
| 60 | bool lttv_filter_event(void *filter, void *event); |
| 61 | |
| 62 | #endif // FILTER_H |
| 63 | |