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
58 LTTV_FILTER_TRACEFILE
,
63 * @enum lttv_expression_op
65 typedef enum _lttv_expression_op
67 LTTV_FIELD_EQ
, /** equal */
68 LTTV_FIELD_NE
, /** not equal */
69 LTTV_FIELD_LT
, /** lower than */
70 LTTV_FIELD_LE
, /** lower or equal */
71 LTTV_FIELD_GT
, /** greater than */
72 LTTV_FIELD_GE
/** greater or equal */
75 typedef enum _lttv_expression_type
78 LTTV_SIMPLE_EXPRESSION
79 } lttv_expression_type
;
81 typedef struct _lttv_simple_expression
83 lttv_expression_op op
;
86 } lttv_simple_expression
;
89 //typedef union _tmp {
90 // struct lttv_expression *e;
91 // lttv_field_relation *se;
94 typedef struct _lttv_expression
100 gboolean simple_expression;
105 typedef union _lttv_expression
{
106 lttv_simple_expression se
;
110 typedef struct _lttv_filter_tree
{
111 lttv_expression
* node
;
112 struct lttv_filter_tree
* r_child
;
113 struct lttv_filter_tree
* l_child
;
117 * @struct lttv_filter
118 * ( will later contain a binary tree of filtering options )
120 typedef struct _lttv_filter
{
121 lttv_filter_tree
* tree
;
124 gboolean
parse_field_path(GList
* fp
);
126 gboolean
parse_simple_expression(GString
* expression
);
128 /* Compile the filter expression into an efficient data structure */
129 lttv_filter
*lttv_filter_new(char *expression
, LttvTraceState
*tfs
);
132 /* Check if the tracefile or event satisfies the filter. The arguments are
133 declared as void * to allow these functions to be used as hooks. */
135 gboolean
lttv_filter_tracefile(lttv_filter
*filter
, LttTracefile
*tracefile
);
137 gboolean
lttv_filter_event(lttv_filter
*filter
, LttEvent
*event
);