1 get_type
   2 sm_prefix
   3 add_hook
   4 strcmp
   5 snprintf
   6 get_filename
   7 get_argument_from_call_expr
   8 printf
   9 INT_PTR
  10 get_function
  11 free_string
  12 print_implied_debug_msg
  13 strip_expr
  14 get_lineno
  15 add_function_hook
  16 is_silenced_function
  17 fprintf