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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/k for monitoring.
Link: https://lkml.kernel.org/r/563234f2bfa84b540f60cf9e39c2d9f0eea95a55.1659052063.git.bristot@kernel.org
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
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: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
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>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
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*
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* Deterministic automata helper functions, to be used with the automata
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* models in C generated by the dot2k tool.
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*/
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/*
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* DECLARE_AUTOMATA_HELPERS - define a set of helper functions for automata
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*
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* Define a set of helper functions for automata. The 'name' argument is used
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* as suffix for the functions and data. These functions will handle automaton
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* with data type 'type'.
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*/
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#define DECLARE_AUTOMATA_HELPERS(name, type) \
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\
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/* \
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* model_get_state_name_##name - return the (string) name of the given state \
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*/ \
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static char *model_get_state_name_##name(enum states_##name state) \
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{ \
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if ((state < 0) || (state >= state_max_##name)) \
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return "INVALID"; \
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\
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return automaton_##name.state_names[state]; \
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} \
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\
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/* \
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* model_get_event_name_##name - return the (string) name of the given event \
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*/ \
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static char *model_get_event_name_##name(enum events_##name event) \
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{ \
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if ((event < 0) || (event >= event_max_##name)) \
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return "INVALID"; \
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\
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return automaton_##name.event_names[event]; \
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} \
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\
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/* \
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* model_get_initial_state_##name - return the automaton's initial state \
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*/ \
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static inline type model_get_initial_state_##name(void) \
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{ \
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return automaton_##name.initial_state; \
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} \
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\
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/* \
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* model_get_next_state_##name - process an automaton event occurrence \
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* \
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* Given the current state (curr_state) and the event (event), returns \
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* the next state, or INVALID_STATE in case of error. \
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*/ \
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static inline type model_get_next_state_##name(enum states_##name curr_state, \
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enum events_##name event) \
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{ \
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if ((curr_state < 0) || (curr_state >= state_max_##name)) \
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return INVALID_STATE; \
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\
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if ((event < 0) || (event >= event_max_##name)) \
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return INVALID_STATE; \
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\
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return automaton_##name.function[curr_state][event]; \
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} \
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\
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/* \
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* model_is_final_state_##name - check if the given state is a final state \
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*/ \
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static inline bool model_is_final_state_##name(enum states_##name state) \
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{ \
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if ((state < 0) || (state >= state_max_##name)) \
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return 0; \
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\
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return automaton_##name.final_states[state]; \
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}
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