smatch_goto_tracker.c

   1 /*
   2  * Copyright (C) 2021 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  * The kernel uses gotos a lot for unwinding.  So it's useful to be able to
  20  * track all the gotos so we can check error codes are set etc.
  21  *
  22  */
  23
  24 #include "smatch.h"
  25
  26 static int my_id;
  27
  28 static void match_goto(struct statement *stmt)
  29 {
  30         if (stmt->type != STMT_GOTO)
  31                 return;
  32         set_state(my_id, "goto", NULL, &true_state);
  33 }
  34
  35 struct sm_state *get_goto_sm_state(void)
  36 {
  37         return get_sm_state(my_id, "goto", NULL);
  38 }
  39
  40 void register_goto_tracker(int id)
  41 {
  42         my_id = id;
  43
  44         add_hook(&match_goto, STMT_HOOK);
  45 }