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/* An overview of the state machine from sm-file.cc.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Keep this in-sync with sm-file.cc */
digraph "file" {
/* STATES. */
/* Start state. */
start;
/* State for a FILE * returned from fopen that hasn't been checked for
NULL.
It could be an open stream, or could be NULL. */
unchecked;
/* State for a FILE * that's known to be NULL. */
null;
/* State for a FILE * that's known to be a non-NULL open stream. */
nonnull;
/* State for a FILE * that's had fclose called on it. */
closed;
/* Stop state, for a FILE * we don't want to track any more. */
stop;
/* TRANSITIONS. */
/* On "fopen". */
start -> unchecked [label="on 'X = fopen(...);'"];
/* On "fclose". */
start -> closed [label="on 'close(X);'"];
/* TODO: is it safe to call fclose (NULL) ? */
unchecked -> closed [label="on 'close(X);'"];
null -> closed [label="on 'close(X);'"];
nonnull -> closed [label="on 'close(X);'"];
closed -> stop [label="on 'close(X);':\nWarn('double fclose')"];
/* on_condition. */
unchecked -> nonnull [label="on 'X != 0'"];
unchecked -> null [label="on 'X == 0'"];
/* Leaks. */
unchecked -> stop [label="on leak:\nWarn('leak')"];
nonnull -> stop [label="on leak:\nWarn('leak')"];
}
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