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 static struct ptr_list *backup;
  17
  18 static void add_return_range(struct range_list *rl)
  19 {
  20         rl = cast_rl(cur_func_return_type(), rl);
  21         if (!return_ranges) {
  22                 return_ranges = rl;
  23                 return;
  24         }
  25         return_ranges = rl_union(return_ranges, rl);
  26 }
  27
  28 static void match_return(struct expression *ret_value)
  29 {
  30         struct range_list *rl;
  31
  32         ret_value = strip_expr(ret_value);
  33         if (!ret_value)
  34                 return;
  35
  36         if (get_implied_rl(ret_value, &rl)) {
  37                 add_return_range(rl);
  38         } else {
  39                 struct symbol *data_type = get_type(ret_value);
  40                 struct symbol *func_type = cur_func_return_type();
  41
  42                 add_return_range(cast_rl(func_type, alloc_whole_rl(data_type)));
  43         }
  44 }
  45
  46 static void match_end_func(struct symbol *sym)
  47 {
  48         if (!return_ranges)
  49                 return;
  50         sql_insert_return_values(show_rl(return_ranges));
  51         return_ranges = NULL;
  52 }
  53
  54 static void match_save_states(struct expression *expr)
  55 {
  56         __add_ptr_list(&backup, return_ranges, 0);
  57         return_ranges = NULL;
  58 }
  59
  60 static void match_restore_states(struct expression *expr)
  61 {
  62         return_ranges = last_ptr_list(backup);
  63         delete_ptr_list_last(&backup);
  64 }
  65
  66 void check_db_info(int id)
  67 {
  68         my_id = id;
  69         add_hook(&match_return, RETURN_HOOK);
  70         add_hook(&match_end_func, END_FUNC_HOOK);
  71         add_hook(&match_save_states, INLINE_FN_START);
  72         add_hook(&match_restore_states, INLINE_FN_END);
  73 }