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,
20 consist in AND, OR and NOT nested expressions, forming a tree with
21 simple relations as leaves. The simple relations test is a field
22 in an event is equal, not equal, smaller, smaller or equal, larger, or
23 larger or equal to a specified value. */
25 #include <lttv/filter.h>
32 simple expr [ op expr ]
34 read_simple_expression
35 read_field_path [ rel value ]
38 read_field_component [. field path]
47 path(component...) -> field
51 * Add an filtering option to the current tree
52 * @param expression Current expression to parse
53 * @return success/failure of operation
56 parse_simple_expression(GString
* expression
) {
60 for(i
=0;i
<strlen(expression
);i
++) {
66 * Creates a new lttv_filter
67 * @param expression filtering options string
68 * @param t pointer to the current LttvTrace
69 * @return the current lttv_filter or NULL if error
72 lttv_filter_new(char *expression
, LttvTrace
*t
) {
76 p
=0, /* parenthesis nesting value */
77 b
=0; /* current breakpoint in expression string */
81 GString
*current_option
= g_string_new("");
82 lttv_simple_expression current_expression
;
84 g_print("filter::lttv_filter_new()\n"); /* debug */
88 * 2. construct binary tree
89 * 3. return corresponding filter
93 * Binary tree memory allocation
94 * - based upon a preliminary block size
96 gulong size
= (strlen(expression
)/6) * 1.5;
97 tree
= g_malloc(size
*sizeof(lttv_filter_tree
));
100 * Parse entire expression and construct
101 * the binary tree. There are two steps
102 * in browsing that string
103 * 1. finding boolean ops ( &,|,^,! ) and parenthesis
104 * 2. finding simple expressions
106 * - op ( >, <, =, >=, <=, !=)
109 for(i
=0;i
<strlen(expression
);i
++) {
110 switch(expression
[i
]) {
115 parse_simple_expression(currentOption
);
116 g_print("%s\n",¤tOption
);
117 currentOption
= g_string_new("");
120 g_print("%s\n",currentOption
);
121 currentOption
= g_string_new("");
124 g_print("%s\n",currentOption
);
125 currentOption
= g_string_new("");
127 case '!': /* not, or not equal (math op) */
128 if(expression
[i
+1] == '=') { /* != */
129 current_expression
.op
= LTTV_FIELD_NE
;
132 g_print("%s\n",currentOption
);
133 currentOption
= g_string_new("");
136 case '(': /* start of parenthesis */
139 case ')': /* end of parenthesis */
143 * mathematic operators
145 case '<': /* lower, lower or equal */
146 if(expression
[i
+1] == '=') { /* <= */
148 current_expression
.op
= LTTV_FIELD_LE
;
149 } else current_expression
.op
= LTTV_FIELD_LT
;
151 case '>': /* higher, higher or equal */
152 if(expression
[i
+1] == '=') { /* >= */
154 current_expression
.op
= LTTV_FIELD_GE
;
155 } else current_expression
.op
= LTTV_FIELD_GT
;
157 case '=': /* equal */
158 current_expression
.op
= LTTV_FIELD_EQ
;
161 default: /* concatening current string */
162 g_string_append_c(currentOption
,expression
[i
]);
169 g_warning("Wrong filtering options, the string\n\"%s\"\n\
170 is not valid due to parenthesis incorrect use",expression
);
176 * Apply the filter to a specific trace
177 * @param filter the current filter applied
178 * @param tracefile the trace to apply the filter to
179 * @return success/failure of operation
182 lttv_filter_tracefile(lttv_filter
*filter
, void *tracefile
) {
187 * Apply the filter to a specific event
188 * @param filter the current filter applied
189 * @param event the event to apply the filter to
190 * @return success/failure of operation
193 lttv_filter_event(lttv_filter
*filter
, void *event
) {