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>
25 #include <lttv/module.h>
27 #include <ltt/event.h>
29 #define AVERAGE_EXPRESSION_LENGTH 6
30 #define MAX_FACTOR 1.5
32 /* A filter expression consists in nested AND, OR and NOT expressions
33 involving boolean relation (>, >=, =, !=, <, <=) between event fields and
34 specific values. It is compiled into an efficient data structure which
35 is used in functions to check if a given event or tracefile satisfies the
38 The grammar for filters is:
42 expression = "(" expression ")" | "!" expression |
43 expression "&&" expression | expression "||" expression |
46 simpleExpression = fieldPath op value
48 fieldPath = fieldComponent [ "." fieldPath ]
50 fieldComponent = name [ "[" integer "]" ]
52 value = integer | double | string
59 LTTV_FILTER_TRACEFILE
,
72 LTTV_FILTER_EX_SUBMODE
,
77 * @enum lttv_expression_op
79 typedef enum _lttv_expression_op
81 LTTV_FIELD_EQ
, /** equal */
82 LTTV_FIELD_NE
, /** not equal */
83 LTTV_FIELD_LT
, /** lower than */
84 LTTV_FIELD_LE
, /** lower or equal */
85 LTTV_FIELD_GT
, /** greater than */
86 LTTV_FIELD_GE
/** greater or equal */
89 typedef enum _lttv_expression_type
92 LTTV_SIMPLE_EXPRESSION
,
94 LTTV_UNDEFINED_EXPRESSION
95 } lttv_expression_type
;
97 typedef enum _lttv_tree_element
{
103 typedef struct _lttv_simple_expression
106 lttv_expression_op op
;
108 } lttv_simple_expression
;
110 typedef enum _lttv_logical_op
{
111 LTTV_LOGICAL_OR
= 1, /* 1 */
112 LTTV_LOGICAL_AND
= 1<<1, /* 2 */
113 LTTV_LOGICAL_NOT
= 1<<2, /* 4 */
114 LTTV_LOGICAL_XOR
= 1<<3 /* 8 */
118 * Ah .. that's my tree
120 //typedef struct _lttv_expression
122 // gboolean simple_expression;
124 // lttv_expression_type type;
126 // struct lttv_expression *e;
127 // lttv_field_relation *se; /* --> simple expression */
131 typedef struct _lttv_expression
{
132 lttv_expression_type type
;
134 lttv_simple_expression
*se
;
139 typedef struct _lttv_filter_tree
{
140 lttv_expression
* node
;
141 lttv_tree_element left
;
142 lttv_tree_element right
;
144 struct lttv_filter_tree
* t
;
145 lttv_expression
* leaf
;
148 struct lttv_filter_tree
* t
;
149 lttv_expression
* leaf
;
154 * @struct lttv_filter
155 * ( will later contain a binary tree of filtering options )
157 typedef struct _lttv_filter_t
{
158 lttv_filter_tree
* tree
;
162 lttv_filter_tree
* lttv_filter_tree_new();
164 void lttv_filter_tree_destroy(lttv_filter_tree
* tree
);
166 /* Parse field path contained in list */
167 gboolean
parse_field_path(GPtrArray
* fp
);
169 gboolean
parse_simple_expression(GString
* expression
);
171 /* Compile the filter expression into an efficient data structure */
172 lttv_filter_tree
*lttv_filter_new(char *expression
, LttvTraceState
*tfs
);
174 /* Check if the tracefile or event satisfies the filter. The arguments are
175 declared as void * to allow these functions to be used as hooks. */
177 gboolean
lttv_filter_tracefile(lttv_filter_tree
*filter
, LttTracefile
*tracefile
);
179 gboolean
lttv_filter_tracestate(lttv_filter_t
*filter
, LttvTraceState
*tracestate
);
181 gboolean
lttv_filter_event(lttv_filter_t
*filter
, LttEvent
*event
);