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1 | /* This file is part of the Linux Trace Toolkit viewer |
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2 | * Copyright (C) 2003-2005 Michel Dagenais |
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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 | |
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19 | /* |
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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 |
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23 | larger or equal to a specified value. |
24 | */ |
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25 | |
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26 | /* |
27 | * YET TO BE ANSWERED |
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28 | * - the exists an other lttv_filter which conflicts with this one |
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29 | */ |
30 | |
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31 | #include <lttv/filter.h> |
32 | |
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33 | /* |
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34 | read_token |
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35 | |
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36 | read_expression |
37 | ( read expr ) |
38 | simple expr [ op expr ] |
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39 | |
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40 | read_simple_expression |
41 | read_field_path [ rel value ] |
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42 | |
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43 | read_field_path |
44 | read_field_component [. field path] |
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45 | |
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46 | read_field_component |
47 | name [ \[ value \] ] |
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48 | |
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49 | data struct: |
50 | and/or(left/right) |
51 | not(child) |
52 | op(left/right) |
53 | path(component...) -> field |
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54 | */ |
55 | |
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56 | GQuark |
57 | LTTV_FILTER_TRACE, |
58 | LTTV_FILTER_TRACESET, |
59 | LTTV_FILTER_TRACEFILE, |
60 | LTTV_FILTER_STATE, |
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61 | LTTV_FILTER_EVENT, |
62 | LTTV_FILTER_NAME, |
63 | LTTV_FILTER_CATEGORY, |
64 | LTTV_FILTER_TIME, |
65 | LTTV_FILTER_TSC, |
66 | LTTV_FILTER_PID, |
67 | LTTV_FILTER_PPID, |
68 | LTTV_FILTER_C_TIME, |
69 | LTTV_FILTER_I_TIME, |
70 | LTTV_FILTER_P_NAME, |
71 | LTTV_FILTER_EX_MODE, |
72 | LTTV_FILTER_EX_SUBMODE, |
73 | LTTV_FILTER_P_STATUS, |
74 | LTTV_FILTER_CPU; |
75 | |
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76 | /** |
77 | * Assign a new tree for the current expression |
78 | * or sub expression |
79 | * @return pointer of lttv_filter_tree |
80 | */ |
81 | lttv_filter_tree* lttv_filter_tree_new() { |
82 | lttv_filter_tree* tree; |
83 | |
84 | tree = g_new(lttv_filter_tree,1); |
85 | tree->node = g_new(lttv_expression,1); |
86 | tree->node->type = LTTV_UNDEFINED_EXPRESSION; |
87 | tree->left = LTTV_TREE_UNDEFINED; |
88 | tree->right = LTTV_TREE_UNDEFINED; |
89 | |
90 | return tree; |
91 | } |
92 | |
93 | /** |
94 | * Destroys the tree and his sub-trees |
95 | * @param tree Tree which must be destroyed |
96 | */ |
97 | void lttv_filter_tree_destroy(lttv_filter_tree* tree) { |
98 | |
99 | if(tree->left == LTTV_TREE_LEAF) g_free(tree->l_child.leaf); |
100 | else if(tree->left == LTTV_TREE_NODE) lttv_filter_tree_destroy(tree->l_child.t); |
101 | |
102 | if(tree->right == LTTV_TREE_LEAF) g_free(tree->r_child.leaf); |
103 | else if(tree->right == LTTV_TREE_NODE) lttv_filter_tree_destroy(tree->r_child.t); |
104 | |
105 | g_free(tree->node); |
106 | g_free(tree); |
107 | } |
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108 | |
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109 | /** |
110 | * Parse through filtering field hierarchy as specified |
111 | * by user. This function compares each value to |
112 | * predetermined quarks |
113 | * @param fp The field path list |
114 | * @return success/failure of operation |
115 | */ |
116 | gboolean |
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117 | parse_field_path(GPtrArray* fp) { |
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118 | |
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119 | GString* f = NULL; |
120 | g_assert(f=g_ptr_array_index(fp,0)); //list_first(fp)->data; |
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121 | |
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122 | if(g_quark_try_string(f->str) == LTTV_FILTER_EVENT) { |
123 | // parse_subfield(fp, LTTV_FILTER_EVENT); |
124 | |
125 | } else if(g_quark_try_string(f->str) == LTTV_FILTER_TRACEFILE) { |
126 | |
127 | } else if(g_quark_try_string(f->str) == LTTV_FILTER_TRACE) { |
128 | |
129 | } else if(g_quark_try_string(f->str) == LTTV_FILTER_STATE) { |
130 | |
131 | } else { |
132 | g_warning("Unrecognized field in filter string"); |
133 | return FALSE; |
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134 | } |
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135 | return TRUE; |
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136 | } |
137 | |
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138 | /** |
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139 | * Add an filtering option to the current tree |
140 | * @param expression Current expression to parse |
141 | * @return success/failure of operation |
142 | */ |
143 | gboolean |
144 | parse_simple_expression(GString* expression) { |
145 | |
146 | unsigned i; |
147 | |
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148 | |
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149 | |
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150 | |
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151 | } |
152 | |
153 | /** |
154 | * Creates a new lttv_filter |
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155 | * @param expression filtering options string |
156 | * @param t pointer to the current LttvTrace |
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157 | * @return the current lttv_filter or NULL if error |
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158 | */ |
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159 | lttv_filter_tree* |
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160 | lttv_filter_new(char *expression, LttvTraceState *tcs) { |
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161 | |
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162 | g_print("filter::lttv_filter_new()\n"); /* debug */ |
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163 | |
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164 | unsigned |
165 | i, |
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166 | p_nesting=0, /* parenthesis nesting value */ |
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167 | b=0; /* current breakpoint in expression string */ |
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168 | |
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169 | /* |
170 | * Main tree & Tree concatening list |
171 | * each element of the list |
172 | * is a sub tree created |
173 | * by the use of parenthesis in the |
174 | * global expression. The final tree |
175 | * will be the one created at the root of |
176 | * the list |
177 | */ |
178 | lttv_filter_tree* tree = NULL; |
179 | lttv_filter_tree* subtree = NULL; |
180 | lttv_filter_tree* current_tree = NULL; |
181 | GPtrArray *tree_list = g_ptr_array_new(); |
182 | g_ptr_array_add( tree_list,(gpointer) tree ); |
183 | |
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184 | /* temporary values */ |
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185 | GString *a_field_component = g_string_new(""); |
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186 | GPtrArray *a_field_path = NULL; |
187 | |
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188 | lttv_simple_expression a_simple_expression; |
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189 | |
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190 | /* |
191 | * Parse entire expression and construct |
192 | * the binary tree. There are two steps |
193 | * in browsing that string |
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194 | * 1. finding boolean ops " &,|,^,! " and parenthesis " {,(,[,],),} " |
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195 | * 2. finding simple expressions |
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196 | * - field path ( separated by dots ) |
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197 | * - op ( >, <, =, >=, <=, !=) |
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198 | * - value ( integer, string ... ) |
199 | * To spare computing time, the whole |
200 | * string is parsed in this loop for a |
201 | * O(n) complexity order. |
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202 | */ |
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203 | |
204 | a_field_path = g_ptr_array_new(); |
205 | g_ptr_array_set_size(a_field_path,2); /* by default, recording 2 field expressions */ |
206 | |
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207 | for(i=0;i<strlen(expression);i++) { |
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208 | g_print("%s\n",a_field_component->str); |
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209 | switch(expression[i]) { |
210 | /* |
211 | * logical operators |
212 | */ |
213 | case '&': /* and */ |
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214 | a_simple_expression.value = a_field_component->str; |
215 | a_field_component = g_string_new(""); |
216 | lttv_filter_tree* t; |
217 | t = lttv_filter_tree_new(); |
218 | t->node->type = LTTV_EXPRESSION_OP; |
219 | t->node->e.op = LTTV_LOGICAL_AND; |
220 | if(subtree != NULL) { |
221 | t->left = LTTV_TREE_NODE; |
222 | t->l_child.t = subtree; |
223 | subtree = NULL; |
224 | } else { |
225 | t->left = LTTV_TREE_LEAF; |
226 | t->l_child.leaf = g_new(lttv_simple_expression,1); |
227 | } |
228 | |
229 | break; |
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230 | case '|': /* or */ |
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231 | break; |
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232 | case '^': /* xor */ |
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233 | break; |
234 | case '!': /* not, or not equal (math op) */ |
235 | if(expression[i+1] == '=') { /* != */ |
236 | a_simple_expression.op = LTTV_FIELD_NE; |
237 | i++; |
238 | } else { /* ! */ |
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239 | g_print("%s\n",a_field_component); |
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240 | a_field_component = g_string_new(""); |
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241 | } |
242 | break; |
243 | case '(': /* start of parenthesis */ |
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244 | case '[': |
245 | case '{': |
246 | p_nesting++; /* incrementing parenthesis nesting value */ |
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247 | lttv_filter_tree* subtree = lttv_filter_tree_new(); |
248 | g_ptr_array_add( tree_list,(gpointer) subtree ); |
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249 | break; |
250 | case ')': /* end of parenthesis */ |
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251 | case ']': |
252 | case '}': |
253 | p_nesting--; /* decrementing parenthesis nesting value */ |
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254 | a_simple_expression.value = a_field_component->str; |
255 | a_field_component = g_string_new(""); |
256 | if(p_nesting<0 || tree_list->len<2) { |
257 | g_warning("Wrong filtering options, the string\n\"%s\"\n\ |
258 | is not valid due to parenthesis incorrect use",expression); |
259 | return NULL; |
260 | } |
261 | /* lttv_filter_tree *sub1 = g_ptr_array_index(tree_list,tree_list->len-1); |
262 | lttv_filter_tree *sub2 = g_ptr_array_index(tree_list,tree_list->len); |
263 | if(sub1->left == LTTV_TREE_UNDEFINED){ |
264 | sub1->l_child.t = sub2; |
265 | sub1->left = LTTV_TREE_NODE; |
266 | } else if(sub1->right == LTTV_TREE_UNDEFINED){ |
267 | sub1->r_child.t = sub2; |
268 | sub1->right = LTTV_TREE_NODE; |
269 | } else g_error("error during tree assignation"); |
270 | g_ptr_array_remove_index(tree_list,tree_list->len); |
271 | break; |
272 | */ |
273 | subtree = g_ptr_array_index(tree_list,tree_list->len); |
274 | g_ptr_array_remove_index(tree_list,tree_list->len); |
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275 | break; |
276 | |
277 | /* |
278 | * mathematic operators |
279 | */ |
280 | case '<': /* lower, lower or equal */ |
281 | if(expression[i+1] == '=') { /* <= */ |
282 | i++; |
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283 | a_simple_expression.op = LTTV_FIELD_LE; |
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284 | } else a_simple_expression.op = LTTV_FIELD_LT; |
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285 | g_ptr_array_add( a_field_path,(gpointer) a_field_component ); |
286 | a_field_component = g_string_new(""); |
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287 | break; |
288 | case '>': /* higher, higher or equal */ |
289 | if(expression[i+1] == '=') { /* >= */ |
290 | i++; |
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291 | a_simple_expression.op = LTTV_FIELD_GE; |
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292 | } else a_simple_expression.op = LTTV_FIELD_GT; |
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293 | g_ptr_array_add( a_field_path,(gpointer) a_field_component ); |
294 | a_field_component = g_string_new(""); |
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295 | break; |
296 | case '=': /* equal */ |
297 | a_simple_expression.op = LTTV_FIELD_EQ; |
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298 | g_ptr_array_add( a_field_path,(gpointer) a_field_component ); |
299 | a_field_component = g_string_new(""); |
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300 | break; |
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301 | /* |
302 | * Field concatening caracter |
303 | */ |
304 | case '.': /* dot */ |
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305 | g_ptr_array_add( a_field_path,(gpointer) a_field_component ); |
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306 | a_field_component = g_string_new(""); |
307 | break; |
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308 | default: /* concatening current string */ |
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309 | g_string_append_c(a_field_component,expression[i]); |
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310 | } |
311 | } |
312 | |
313 | |
314 | |
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315 | if( p_nesting>0 ) { |
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316 | g_warning("Wrong filtering options, the string\n\"%s\"\n\ |
317 | is not valid due to parenthesis incorrect use",expression); |
318 | return NULL; |
319 | } |
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320 | } |
321 | |
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322 | /** |
323 | * Apply the filter to a specific trace |
324 | * @param filter the current filter applied |
325 | * @param tracefile the trace to apply the filter to |
326 | * @return success/failure of operation |
327 | */ |
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328 | gboolean |
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329 | lttv_filter_tracefile(lttv_filter_t *filter, LttTracefile *tracefile) { |
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330 | |
331 | |
332 | |
333 | /* test */ |
334 | /* int i, nb; |
335 | char *f_name, *e_name; |
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336 | |
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337 | char* field = "cpu"; |
338 | |
339 | LttvTraceHook h; |
340 | |
341 | LttEventType *et; |
342 | |
343 | LttType *t; |
344 | |
345 | GString *fe_name = g_string_new(""); |
346 | |
347 | nb = ltt_trace_eventtype_number(tcs->parent.t); |
348 | g_print("NB:%i\n",nb); |
349 | for(i = 0 ; i < nb ; i++) { |
350 | et = ltt_trace_eventtype_get(tcs->parent.t, i); |
351 | e_name = ltt_eventtype_name(et); |
352 | f_name = ltt_facility_name(ltt_eventtype_facility(et)); |
353 | g_string_printf(fe_name, "%s.%s", f_name, e_name); |
354 | g_print("facility:%s and event:%s\n",f_name,e_name); |
355 | } |
356 | */ |
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357 | } |
358 | |
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359 | gboolean |
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360 | lttv_filter_tracestate(lttv_filter_t *filter, LttvTraceState *tracestate) { |
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361 | |
362 | } |
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363 | |
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364 | /** |
365 | * Apply the filter to a specific event |
366 | * @param filter the current filter applied |
367 | * @param event the event to apply the filter to |
368 | * @return success/failure of operation |
369 | */ |
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370 | gboolean |
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371 | lttv_filter_event(lttv_filter_t *filter, LttEvent *event) { |
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372 | |
373 | } |
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374 | |
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375 | /** |
376 | * Initializes the filter module and specific values |
377 | */ |
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378 | static void module_init() |
379 | { |
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380 | |
381 | /* |
382 | * Quarks initialization |
383 | * for hardcoded filtering options |
384 | * |
385 | * TODO: traceset has no yet been defined |
386 | */ |
387 | |
388 | /* top fields */ |
389 | LTTV_FILTER_EVENT = g_quark_from_string("event"); |
390 | LTTV_FILTER_TRACE = g_quark_from_string("trace"); |
391 | LTTV_FILTER_TRACESET = g_quark_from_string("traceset"); |
392 | LTTV_FILTER_STATE = g_quark_from_string("state"); |
393 | LTTV_FILTER_TRACEFILE = g_quark_from_string("tracefile"); |
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394 | |
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395 | /* event.name, tracefile.name, trace.name */ |
396 | LTTV_FILTER_NAME = g_quark_from_string("name"); |
397 | |
398 | /* event sub fields */ |
399 | LTTV_FILTER_CATEGORY = g_quark_from_string("category"); |
400 | LTTV_FILTER_TIME = g_quark_from_string("time"); |
401 | LTTV_FILTER_TSC = g_quark_from_string("tsc"); |
402 | |
403 | /* state sub fields */ |
404 | LTTV_FILTER_PID = g_quark_from_string("pid"); |
405 | LTTV_FILTER_PPID = g_quark_from_string("ppid"); |
406 | LTTV_FILTER_C_TIME = g_quark_from_string("creation_time"); |
407 | LTTV_FILTER_I_TIME = g_quark_from_string("insertion_time"); |
408 | LTTV_FILTER_P_NAME = g_quark_from_string("process_name"); |
409 | LTTV_FILTER_EX_MODE = g_quark_from_string("execution_mode"); |
410 | LTTV_FILTER_EX_SUBMODE = g_quark_from_string("execution_submode"); |
411 | LTTV_FILTER_P_STATUS = g_quark_from_string("process_status"); |
412 | LTTV_FILTER_CPU = g_quark_from_string("cpu"); |
413 | |
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414 | } |
415 | |
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416 | /** |
417 | * Destroys the filter module and specific values |
418 | */ |
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419 | static void module_destroy() |
420 | { |
421 | } |
422 | |
423 | |
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424 | LTTV_MODULE("filter", "Filters traceset and events", \ |
425 | "Filters traceset and events specifically to user input", \ |
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426 | module_init, module_destroy) |
427 | |
428 | |
429 | |