ltt/branches/poly/lttv/lttv/filter.h

   1 /* This file is part of the Linux Trace Toolkit viewer
   2  * Copyright (C) 2003-2004 Michel Dagenais
   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
  19 #ifndef FILTER_H
  20 #define FILTER_H
  21
  22 #include <lttv/traceset.h>
  23 #include <lttv/tracecontext.h>
  24 #include <lttv/state.h>
  25 #include <lttv/module.h>
  26 #include <ltt/ltt.h>
  27 #include <ltt/event.h>
  28
  29 #define AVERAGE_EXPRESSION_LENGTH 6
  30 #define MAX_FACTOR 1.5
  31
  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
  36    filter.
  37
  38    The grammar for filters is:
  39
  40    filter = expression
  41
  42    expression = "(" expression ")" | "!" expression |
  43                 expression "&&" expression | expression "||" expression |
  44                 simpleExpression
  45
  46    simpleExpression = fieldPath op value
  47
  48    fieldPath = fieldComponent [ "." fieldPath ]
  49
  50    fieldComponent = name [ "[" integer "]" ]
  51
  52    value = integer | double | string
  53
  54 */
  55
  56 extern GQuark
  57   LTTV_FILTER_TRACE,
  58   LTTV_FILTER_TRACESET,
  59   LTTV_FILTER_TRACEFILE,
  60   LTTV_FILTER_STATE,
  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
  76 /**
  77  *      @enum lttv_expression_op
  78  */
  79 typedef enum _lttv_expression_op
  80 {
  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 */
  87 } lttv_expression_op;
  88
  89 typedef enum _lttv_expression_type
  90 {
  91   LTTV_EXPRESSION,
  92   LTTV_SIMPLE_EXPRESSION
  93 } lttv_expression_type;
  94
  95 typedef struct _lttv_simple_expression
  96 {
  97   lttv_expression_op op;
  98   char *field_name;
  99   char *value;
 100 } lttv_simple_expression;
 101
 102 typedef enum _lttv_logical_op {
 103     OR = 1,         /* 1 */
 104     AND = 1<<1,     /* 2 */
 105     NOT = 1<<2,     /* 4 */
 106     XOR = 1<<3      /* 8 */
 107 } lttv_logical_op;
 108
 109 /*
 110  * Ah .. that's my tree
 111  */
 112 typedef struct _lttv_expression
 113 {
 114 //  gboolean simple_expression;
 115   int op;
 116   lttv_expression_type type;
 117   union {
 118     struct lttv_expression *e;
 119  //   lttv_field_relation *se;  /* --> simple expression */
 120   } e;
 121 } lttv_expression;
 122
 123
 124 //typedef union _lttv_expression {
 125 //  lttv_simple_expression se;
 126 //
 127 //} lttv_expression;
 128
 129 typedef struct _lttv_filter_tree {
 130         lttv_expression* node;
 131         struct lttv_filter_tree* r_child;
 132         struct lttv_filter_tree* l_child;
 133 } lttv_filter_tree;
 134
 135 /**
 136  * @struct lttv_filter
 137  * ( will later contain a binary tree of filtering options )
 138  */
 139 typedef struct _lttv_filter_t {
 140         lttv_filter_tree* tree;
 141 } lttv_filter_t;
 142
 143 /* Parse field path contained in list */
 144 gboolean parse_field_path(GList* fp);
 145
 146
 147 gboolean parse_simple_expression(GString* expression);
 148
 149 /* Compile the filter expression into an efficient data structure */
 150 lttv_filter_t *lttv_filter_new(char *expression, LttvTraceState *tfs);
 151
 152
 153 /* Check if the tracefile or event satisfies the filter. The arguments are
 154    declared as void * to allow these functions to be used as hooks. */
 155
 156 gboolean lttv_filter_tracefile(lttv_filter_t *filter, LttTracefile *tracefile);
 157
 158 gboolean lttv_filter_tracestate(lttv_filter_t *filter, LttvTraceState *tracestate);
 159
 160 gboolean lttv_filter_event(lttv_filter_t *filter, LttEvent *event);
 161
 162 #endif // FILTER_H
 163