1 /* This file is part of the Linux Trace Toolkit viewer
2 * Copyright (C) 2003-2004 Michel Dagenais
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;
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.
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,
22 #include <lttv/traceset.h>
23 #include <lttv/tracecontext.h>
24 #include <lttv/state.h>
26 #include <ltt/event.h>
28 #define AVERAGE_EXPRESSION_LENGTH 6
29 #define MAX_FACTOR 1.5
31 /* A filter expression consists in nested AND, OR and NOT expressions
32 involving boolean relation (>, >=, =, !=, <, <=) between event fields and
33 specific values. It is compiled into an efficient data structure which
34 is used in functions to check if a given event or tracefile satisfies the
37 The grammar for filters is:
41 expression = "(" expression ")" | "!" expression |
42 expression "&&" expression | expression "||" expression |
45 simpleExpression = fieldPath op value
47 fieldPath = fieldComponent [ "." fieldPath ]
49 fieldComponent = name [ "[" integer "]" ]
51 value = integer | double | string
56 * @enum lttv_expression_op
58 typedef enum _lttv_expression_op
60 LTTV_FIELD_EQ
, /** equal */
61 LTTV_FIELD_NE
, /** not equal */
62 LTTV_FIELD_LT
, /** lower than */
63 LTTV_FIELD_LE
, /** lower or equal */
64 LTTV_FIELD_GT
, /** greater than */
65 LTTV_FIELD_GE
/** greater or equal */
68 typedef enum _lttv_expression_type
71 LTTV_SIMPLE_EXPRESSION
72 } lttv_expression_type
;
74 typedef struct _lttv_simple_expression
76 lttv_expression_op op
;
79 } lttv_simple_expression
;
82 //typedef union _tmp {
83 // struct lttv_expression *e;
84 // lttv_field_relation *se;
87 typedef struct _lttv_expression
93 gboolean simple_expression;
98 typedef union _lttv_expression
{
99 lttv_simple_expression se
;
103 typedef struct _lttv_filter_tree
{
104 lttv_expression
* node
;
105 struct lttv_filter_tree
* r_child
;
106 struct lttv_filter_tree
* l_child
;
110 * @struct lttv_filter
111 * ( will later contain a binary tree of filtering options )
113 typedef struct _lttv_filter
{
114 lttv_filter_tree
* tree
;
117 gboolean
parse_simple_expression(GString
* expression
);
119 /* Compile the filter expression into an efficient data structure */
121 lttv_filter
*lttv_filter_new(char *expression
, LttvTraceState
*tfs
);
124 /* Check if the tracefile or event satisfies the filter. The arguments are
125 declared as void * to allow these functions to be used as hooks. */
127 gboolean
lttv_filter_tracefile(lttv_filter
*filter
, LttvTrace
*tracefile
);
129 gboolean
lttv_filter_event(lttv_filter
*filter
, LttEvent
*event
);