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 range_list *rl;
  29
  30         ret_value = strip_expr(ret_value);
  31         if (!ret_value)
  32                 return;
  33
  34         if (get_implied_range_list(ret_value, &rl)) {
  35                 sm_msg("info: return_value %s", show_ranges(rl));
  36                 add_return_range(rl);
  37         } else {
  38                 sm_msg("info: return_value unknown");
  39                 add_return_range(whole_range_list());
  40         }
  41 }
  42
  43 static void match_end_func(struct symbol *sym)
  44 {
  45         if (!return_ranges)
  46                 return;
  47         sm_msg("info: function_return_values '%s'", show_ranges(return_ranges));
  48         return_ranges = NULL;
  49 }
  50
  51 void check_db_info(int id)
  52 {
  53         if (!option_info)
  54                 return;
  55         my_id = id;
  56         add_hook(&match_return, RETURN_HOOK);
  57         add_hook(&match_end_func, END_FUNC_HOOK);
  58 }