smatch_estate.c

   1 /*
   2  * smatch/smatch_dinfo.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 /*
  11  * smatch_dinfo.c has helper functions for handling data_info structs
  12  *
  13  */
  14
  15 #include <stdlib.h>
  16 #ifndef __USE_ISOC99
  17 #define __USE_ISOC99
  18 #endif
  19 #include <limits.h>
  20 #include "parse.h"
  21 #include "smatch.h"
  22 #include "smatch_slist.h"
  23 #include "smatch_extra.h"
  24
  25 struct smatch_state estate_undefined = {
  26         .name = "unknown"
  27 };
  28
  29 struct data_info *get_dinfo(struct smatch_state *state)
  30 {
  31         if (!state)
  32                 return NULL;
  33         return (struct data_info *)state->data;
  34 }
  35
  36 struct range_list_sval *estate_ranges_sval(struct smatch_state *state)
  37 {
  38         if (!state)
  39                 return NULL;
  40         return get_dinfo(state)->value_ranges;
  41 }
  42
  43 struct related_list *estate_related(struct smatch_state *state)
  44 {
  45         if (!state)
  46                 return NULL;
  47         return get_dinfo(state)->related;
  48 }
  49
  50 sval_t estate_min_sval(struct smatch_state *state)
  51 {
  52         return rl_min_sval(estate_ranges_sval(state));
  53 }
  54
  55 sval_t estate_max_sval(struct smatch_state *state)
  56 {
  57         return rl_max_sval(estate_ranges_sval(state));
  58 }
  59
  60 static int rlists_equiv(struct related_list *one, struct related_list *two)
  61 {
  62         struct relation *one_rel;
  63         struct relation *two_rel;
  64
  65         PREPARE_PTR_LIST(one, one_rel);
  66         PREPARE_PTR_LIST(two, two_rel);
  67         for (;;) {
  68                 if (!one_rel && !two_rel)
  69                         return 1;
  70                 if (!one_rel || !two_rel)
  71                         return 0;
  72                 if (one_rel->sym != two_rel->sym)
  73                         return 0;
  74                 if (strcmp(one_rel->name, two_rel->name))
  75                         return 0;
  76                 NEXT_PTR_LIST(one_rel);
  77                 NEXT_PTR_LIST(two_rel);
  78         }
  79         FINISH_PTR_LIST(two_rel);
  80         FINISH_PTR_LIST(one_rel);
  81
  82         return 1;
  83 }
  84
  85 int estates_equiv(struct smatch_state *one, struct smatch_state *two)
  86 {
  87         if (one == two)
  88                 return 1;
  89         if (!rlists_equiv(estate_related(one), estate_related(two)))
  90                 return 0;
  91         if (strcmp(one->name, two->name) == 0)
  92                 return 1;
  93         return 0;
  94 }
  95
  96 static struct data_info *alloc_dinfo(void)
  97 {
  98         struct data_info *ret;
  99
 100         ret = __alloc_data_info(0);
 101         ret->related = NULL;
 102         ret->type = DATA_RANGE;
 103         ret->value_ranges = NULL;
 104         return ret;
 105 }
 106
 107 static struct data_info *alloc_dinfo_range(sval_t min, sval_t max)
 108 {
 109         struct data_info *ret;
 110
 111         ret = alloc_dinfo();
 112         add_range_sval(&ret->value_ranges, min, max);
 113         return ret;
 114 }
 115
 116 static struct data_info *alloc_dinfo_range_list(struct range_list_sval *rl)
 117 {
 118         struct data_info *ret;
 119
 120         ret = alloc_dinfo();
 121         ret->value_ranges = rl;
 122         return ret;
 123 }
 124
 125 static struct data_info *clone_dinfo(struct data_info *dinfo)
 126 {
 127         struct data_info *ret;
 128
 129         ret = alloc_dinfo();
 130         ret->related = clone_related_list(dinfo->related);
 131         ret->value_ranges = clone_range_list_sval(dinfo->value_ranges);
 132         return ret;
 133 }
 134
 135 struct smatch_state *clone_estate(struct smatch_state *state)
 136 {
 137         struct smatch_state *ret;
 138
 139         ret = __alloc_smatch_state(0);
 140         ret->name = state->name;
 141         ret->data = clone_dinfo(get_dinfo(state));
 142         return ret;
 143 }
 144
 145 struct smatch_state *alloc_estate_empty(void)
 146 {
 147         struct smatch_state *state;
 148         struct data_info *dinfo;
 149
 150         dinfo = alloc_dinfo();
 151         state = __alloc_smatch_state(0);
 152         state->data = dinfo;
 153         state->name = "";
 154         return state;
 155 }
 156
 157 /* We do this because ->value_ranges is a list */
 158 struct smatch_state *extra_undefined(void)
 159 {
 160         return &estate_undefined;
 161 }
 162
 163 struct smatch_state *extra_empty(void)
 164 {
 165         struct smatch_state *ret;
 166
 167         ret = __alloc_smatch_state(0);
 168         ret->name = "empty";
 169         ret->data = alloc_dinfo();
 170         return ret;
 171 }
 172
 173 struct smatch_state *alloc_estate_sval(sval_t sval)
 174 {
 175         struct smatch_state *state;
 176
 177         state = __alloc_smatch_state(0);
 178         state->data = alloc_dinfo_range(sval, sval);
 179         state->name = show_ranges_sval(get_dinfo(state)->value_ranges);
 180         return state;
 181 }
 182
 183 struct smatch_state *alloc_estate_range_sval(sval_t min, sval_t max)
 184 {
 185         struct smatch_state *state;
 186
 187         state = __alloc_smatch_state(0);
 188         state->data = alloc_dinfo_range(min, max);
 189         state->name = show_ranges_sval(get_dinfo(state)->value_ranges);
 190         return state;
 191 }
 192
 193 struct smatch_state *alloc_estate_range_list_sval(struct range_list_sval *rl)
 194 {
 195         struct smatch_state *state;
 196
 197         if (!rl)
 198                 return extra_empty();
 199
 200         state = __alloc_smatch_state(0);
 201         state->data = alloc_dinfo_range_list(rl);
 202         state->name = show_ranges_sval(rl);
 203         return state;
 204 }
 205
 206 void alloc_estate_undefined(void)
 207 {
 208         static struct data_info dinfo = {
 209                 .type = DATA_RANGE
 210         };
 211
 212         dinfo.value_ranges = clone_permanent_sval(whole_range_list_sval(&llong_ctype));
 213         estate_undefined.data = &dinfo;
 214 }