check_array_condition.c

   1 /*
   2  * Copyright (C) 2013 Oracle.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 /*
  19  * struct foo { char buf[10]; };
  20  *
  21  * struct foo *p = something();
  22  * if (p->buf) { ...
  23  *
  24  */
  25
  26 #include "smatch.h"
  27
  28 static int my_id;
  29
  30 static void match_condition(struct expression *expr)
  31 {
  32         struct symbol *type;
  33         char *str;
  34
  35         if (expr->type != EXPR_DEREF)
  36                 return;
  37         type = get_type(expr);
  38         if (!type || type->type != SYM_ARRAY)
  39                 return;
  40         if (get_macro_name(expr->pos))
  41                 return;
  42
  43         str = expr_to_str(expr);
  44         sm_msg("warn: this array is probably non-NULL. '%s'", str);
  45         free_string(str);
  46 }
  47
  48 void check_array_condition(int id)
  49 {
  50         my_id = id;
  51         add_hook(&match_condition, CONDITION_HOOK);
  52 }