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    Subject[PATCH V4 03/20] rv/include: Add helper functions for deterministic automata
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    Formally, a deterministic automaton, denoted by G, is defined as a
    quintuple:

    G = { X, E, f, x_0, X_m }

    where:
    - X is the set of states;
    - E is the finite set of events;
    - x_0 is the initial state;
    - X_m (subset of X) is the set of marked states.
    - f : X x E -> X $ is the transition function. It defines the
    state transition in the occurrence of a event from E in
    the state X. In the special case of deterministic automata,
    the occurrence of the event in E in a state in X has a
    deterministic next state from X.

    An automaton can also be represented using a graphical format of
    vertices (nodes) and edges. The open-source tool Graphviz can produce
    this graphic format using the (textual) DOT language as the source code.

    The dot2c tool presented in this paper:

    DE OLIVEIRA, Daniel Bristot; CUCINOTTA, Tommaso; DE OLIVEIRA, Romulo
    Silva. Efficient formal verification for the Linux kernel. In:
    International Conference on Software Engineering and Formal Methods.
    Springer, Cham, 2019. p. 315-332.

    Translates a deterministic automaton in the DOT format into a C
    source code representation that to be used for monitoring.

    This header file implements helper functions to facilitate the usage
    of the C output from dot2c for monitoring.

    Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
    Cc: Guenter Roeck <linux@roeck-us.net>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Will Deacon <will@kernel.org>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Marco Elver <elver@google.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: "Paul E. McKenney" <paulmck@kernel.org>
    Cc: Shuah Khan <skhan@linuxfoundation.org>
    Cc: Gabriele Paoloni <gpaoloni@redhat.com>
    Cc: Juri Lelli <juri.lelli@redhat.com>
    Cc: Clark Williams <williams@redhat.com>
    Cc: linux-doc@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Cc: linux-trace-devel@vger.kernel.org
    Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
    ---
    include/rv/automata.h | 49 +++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 49 insertions(+)
    create mode 100644 include/rv/automata.h

    diff --git a/include/rv/automata.h b/include/rv/automata.h
    new file mode 100644
    index 000000000000..0c0aa54bd820
    --- /dev/null
    +++ b/include/rv/automata.h
    @@ -0,0 +1,49 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +/*
    + * Deterministic automata helper functions, to be used with the automata
    + * models in C generated by the dot2k tool.
    + *
    + * Copyright (C) 2019-2022 Daniel Bristot de Oliveira <bristot@kernel.org>
    + */
    +
    +#define DECLARE_AUTOMATA_HELPERS(name, type) \
    + \
    +static inline void *model_get_model_##name(void) \
    +{ \
    + return (void *) &automaton_##name; \
    +} \
    + \
    +static char *model_get_state_name_##name(enum states_##name state) \
    +{ \
    + return automaton_##name.state_names[state]; \
    +} \
    + \
    +static char *model_get_event_name_##name(enum events_##name event) \
    +{ \
    + return automaton_##name.event_names[event]; \
    +} \
    + \
    +static inline type model_get_init_state_##name(void) \
    +{ \
    + return automaton_##name.initial_state; \
    +} \
    + \
    +static inline type model_get_next_state_##name(enum states_##name curr_state, \
    + enum events_##name event) \
    +{ \
    + if ((curr_state < 0) || (curr_state > state_max_##name)) \
    + return -1; \
    + \
    + if ((event < 0) || (event > event_max_##name)) \
    + return -1; \
    + \
    + return automaton_##name.function[curr_state][event]; \
    +} \
    + \
    +static inline bool model_is_final_state_##name(enum states_##name state) \
    +{ \
    + if ((state < 0) || (state > state_max_##name)) \
    + return 0; \
    + \
    + return !!automaton_##name.final_states[state]; \
    +}
    --
    2.35.1
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