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         rl = cast_rl(cur_func_return_type(), rl);
  20         if (!return_ranges) {
  21                 return_ranges = rl;
  22                 return;
  23         }
  24         return_ranges = rl_union(return_ranges, rl);
  25 }
  26
  27 static void match_return(struct expression *ret_value)
  28 {
  29         struct range_list *rl;
  30         struct symbol *type = cur_func_return_type();
  31
  32         ret_value = strip_expr(ret_value);
  33         if (!ret_value)
  34                 return;
  35
  36         if (get_implied_range_list(ret_value, &rl))
  37                 add_return_range(rl);
  38         else
  39                 add_return_range(alloc_whole_rl(type));
  40 }
  41
  42 static void match_end_func(struct symbol *sym)
  43 {
  44         if (!return_ranges)
  45                 return;
  46         sm_msg("info: function_return_values '%s' %s",
  47                show_ranges(return_ranges), global_static());
  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 }