check_input_free_device.c

   1 /*
   2  * Copyright (C) 2010 Dan Carpenter.
   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  * Don't call input_free_device() after calling
  20  * input_unregister_device()
  21  *
  22  */
  23
  24 #include "smatch.h"
  25 #include "smatch_slist.h"
  26
  27 STATE(no_free);
  28 STATE(ok);
  29
  30 static int my_id;
  31
  32 static void match_assign(struct expression *expr)
  33 {
  34         if (get_state_expr(my_id, expr->left)) {
  35                 set_state_expr(my_id, expr->left, &ok);
  36         }
  37 }
  38
  39 static void match_input_unregister(const char *fn, struct expression *expr, void *data)
  40 {
  41         struct expression *arg;
  42
  43         arg = get_argument_from_call_expr(expr->args, 0);
  44         set_state_expr(my_id, arg, &no_free);
  45 }
  46
  47 static void match_input_free(const char *fn, struct expression *expr, void *data)
  48 {
  49         struct expression *arg;
  50         struct sm_state *sm;
  51
  52         arg = get_argument_from_call_expr(expr->args, 0);
  53         sm = get_sm_state_expr(my_id, arg);
  54         if (!sm)
  55                 return;
  56         if (!slist_has_state(sm->possible, &no_free))
  57                 return;
  58         sm_error("don't call input_free_device() after input_unregister_device()");
  59 }
  60
  61 void check_input_free_device(int id)
  62 {
  63         my_id = id;
  64         if (option_project != PROJ_KERNEL)
  65                 return;
  66         add_hook(&match_assign, ASSIGNMENT_HOOK);
  67         add_function_hook("input_unregister_device", &match_input_unregister, NULL);
  68         add_function_hook("input_free_device", &match_input_free, NULL);
  69 }