check_assign_vs_compare.c

   1 /*
   2  * Copyright (C) 2012 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 #include "smatch.h"
  19
  20 static int my_id;
  21
  22 static void match_condition(struct expression *expr)
  23 {
  24         sval_t val;
  25
  26         if (expr->type != EXPR_ASSIGNMENT || expr->op != '=')
  27                 return;
  28
  29         if (!get_value(expr->right, &val))
  30                 return;
  31         sm_msg("warn: was '== %s' instead of '='", sval_to_str(val));
  32 }
  33
  34 void check_assign_vs_compare(int id)
  35 {
  36         my_id = id;
  37         add_hook(&match_condition, CONDITION_HOOK);
  38 }