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 clear(struct sm_state *sm, struct expression *mod_expr)
  26 {
  27         set_state(my_id, sm->name, sm->sym, &undefined);
  28 }
  29
  30 static void match_while_count_down(struct expression *expr)
  31 {
  32         struct statement *stmt = __cur_stmt;
  33
  34         if (expr->type != EXPR_POSTOP || expr->op != SPECIAL_DECREMENT)
  35                 return;
  36
  37         if (!stmt || stmt->type != STMT_ITERATOR)
  38                 return;
  39
  40         set_true_false_states_expr(my_id, strip_expr(expr->unop), NULL, &timed_out);
  41 }
  42
  43 static void match_test(struct expression *expr)
  44 {
  45         struct sm_state *sm;
  46         char *name;
  47
  48         sm = get_sm_state_expr(my_id, expr);
  49         if (!sm || !slist_has_state(sm->possible, &timed_out))
  50                 return;
  51
  52         name = expr_to_str(expr);
  53         sm_msg("warn: should this be '%s == -1'", name);
  54         free_string(name);
  55 }
  56
  57 void check_postop_timeout(int id)
  58 {
  59         my_id = id;
  60         add_hook(&match_while_count_down, CONDITION_HOOK);
  61         add_hook(&match_test, CONDITION_HOOK);
  62         add_modification_hook(my_id, &clear);
  63 }