check_db_info.c

   1 /*
   2  * smatch/check_db_info.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include "smatch.h"
  11 #include "smatch_extra.h"
  12
  13 static int my_id;
  14
  15 static struct range_list *return_ranges;
  16
  17 static void add_return_range(struct range_list *rl)
  18 {
  19         if (!return_ranges) {
  20                 return_ranges = rl;
  21                 return;
  22         }
  23         return_ranges = range_list_union(return_ranges, rl);
  24 }
  25
  26 static void match_return(struct expression *ret_value)
  27 {
  28         struct smatch_state *state;
  29         struct range_list *rl;
  30         long long val;
  31
  32         ret_value = strip_expr(ret_value);
  33         if (!ret_value)
  34                 return;
  35
  36         if (ret_value->type == EXPR_CALL) {
  37                 rl = db_return_vals(ret_value);
  38                 if (rl) {
  39                         sm_msg("info: return_value %s", show_ranges(rl));
  40                         add_return_range(rl);
  41                 } else {
  42                         sm_msg("info: return_value unknown");
  43                         add_return_range(whole_range_list());
  44                 }
  45                 return;
  46         }
  47
  48         if (get_value(ret_value, &val)) {
  49                 sm_msg("info: return_value %lld", val);
  50                 add_return_range(alloc_range_list(val, val));
  51                 return;
  52         }
  53         state = get_state_expr(SMATCH_EXTRA, ret_value);
  54         if (!state) {
  55                 sm_msg("info: return_value unknown");
  56                 add_return_range(whole_range_list());
  57                 return;
  58         }
  59
  60         sm_msg("info: return_value %s", state->name);
  61         add_return_range(whole_range_list());
  62 }
  63
  64 static void match_end_func(struct symbol *sym)
  65 {
  66         if (!return_ranges)
  67                 return;
  68         sm_msg("info: function_return_values '%s'", show_ranges(return_ranges));
  69         return_ranges = NULL;
  70 }
  71
  72 void check_db_info(int id)
  73 {
  74         if (!option_info)
  75                 return;
  76         my_id = id;
  77         add_hook(&match_return, RETURN_HOOK);
  78         add_hook(&match_end_func, END_FUNC_HOOK);
  79 }