check_postop_timeout.c

   1 /*
   2  * Copyright (C) 2015 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 #include "smatch_slist.h"
  20
  21 static int my_id;
  22
  23 STATE(timed_out);
  24
  25 static void match_while_count_down(struct expression *expr)
  26 {
  27         struct statement *stmt = __cur_stmt;
  28
  29         if (expr->type != EXPR_POSTOP || expr->op != SPECIAL_DECREMENT)
  30                 return;
  31
  32         if (!stmt || stmt->type != STMT_ITERATOR)
  33                 return;
  34
  35         set_true_false_states_expr(my_id, strip_expr(expr->unop), NULL, &timed_out);
  36 }
  37
  38 static void match_test(struct expression *expr)
  39 {
  40         struct sm_state *sm;
  41         char *name;
  42
  43         sm = get_sm_state_expr(my_id, expr);
  44         if (!sm || !slist_has_state(sm->possible, &timed_out))
  45                 return;
  46
  47         name = expr_to_str(expr);
  48         sm_msg("warn: should this be '%s == -1'", name);
  49         free_string(name);
  50 }
  51
  52 void check_postop_timeout(int id)
  53 {
  54         my_id = id;
  55         add_hook(&match_while_count_down, CONDITION_HOOK);
  56         add_hook(&match_test, CONDITION_HOOK);
  57         add_modification_hook(my_id, &set_undefined);
  58 }