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         struct symbol *type = cur_func_return_type();
  32
  33         ret_value = strip_expr(ret_value);
  34         if (!ret_value)
  35                 return;
  36
  37         if (get_implied_rl(ret_value, &rl))
  38                 add_return_range(rl);
  39         else
  40                 add_return_range(alloc_whole_rl(type));
  41 }
  42
  43 static void match_end_func(struct symbol *sym)
  44 {
  45         if (!return_ranges)
  46                 return;
  47         sql_insert_return_values(show_rl(return_ranges));
  48         return_ranges = NULL;
  49 }
  50
  51 static void match_save_states(struct expression *expr)
  52 {
  53         __add_ptr_list(&backup, return_ranges, 0);
  54         return_ranges = NULL;
  55 }
  56
  57 static void match_restore_states(struct expression *expr)
  58 {
  59         return_ranges = last_ptr_list(backup);
  60         delete_ptr_list_last(&backup);
  61 }
  62
  63 void check_db_info(int id)
  64 {
  65         my_id = id;
  66         add_hook(&match_return, RETURN_HOOK);
  67         add_hook(&match_end_func, END_FUNC_HOOK);
  68         add_hook(&match_save_states, INLINE_FN_START);
  69         add_hook(&match_restore_states, INLINE_FN_END);
  70 }