--- /dev/null
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
+#
+# dot2c: parse an automata in dot file digraph format into a C
+#
+# This program was written in the development of this paper:
+# de Oliveira, D. B. and Cucinotta, T. and de Oliveira, R. S.
+# "Efficient Formal Verification for the Linux Kernel." International
+# Conference on Software Engineering and Formal Methods. Springer, Cham, 2019.
+
+from dot2.automata import Automata
+
+class Dot2c(Automata):
+ enum_suffix = ""
+ enum_states_def = "states"
+ enum_events_def = "events"
+ struct_automaton_def = "automaton"
+ var_automaton_def = "aut"
+
+ def __init__(self, file_path):
+ super().__init__(file_path)
+ self.line_length = 100
+
+ def __buff_to_string(self, buff):
+ string = ""
+
+ for line in buff:
+ string = string + line + "\n"
+
+ # cut off the last \n
+ return string[:-1]
+
+ def __get_enum_states_content(self):
+ buff = []
+ buff.append("\t%s%s = 0," % (self.initial_state, self.enum_suffix))
+ for state in self.states:
+ if state != self.initial_state:
+ buff.append("\t%s%s," % (state, self.enum_suffix))
+ buff.append("\tstate_max%s" % (self.enum_suffix))
+
+ return buff
+
+ def get_enum_states_string(self):
+ buff = self.__get_enum_states_content()
+ return self.__buff_to_string(buff)
+
+ def format_states_enum(self):
+ buff = []
+ buff.append("enum %s {" % self.enum_states_def)
+ buff.append(self.get_enum_states_string())
+ buff.append("};\n")
+
+ return buff
+
+ def __get_enum_events_content(self):
+ buff = []
+ first = True
+ for event in self.events:
+ if first:
+ buff.append("\t%s%s = 0," % (event, self.enum_suffix))
+ first = False
+ else:
+ buff.append("\t%s%s," % (event, self.enum_suffix))
+
+ buff.append("\tevent_max%s" % self.enum_suffix)
+
+ return buff
+
+ def get_enum_events_string(self):
+ buff = self.__get_enum_events_content()
+ return self.__buff_to_string(buff)
+
+ def format_events_enum(self):
+ buff = []
+ buff.append("enum %s {" % self.enum_events_def)
+ buff.append(self.get_enum_events_string())
+ buff.append("};\n")
+
+ return buff
+
+ def get_minimun_type(self):
+ min_type = "unsigned char"
+
+ if self.states.__len__() > 255:
+ min_type = "unsigned short"
+
+ if self.states.__len__() > 65535:
+ min_type = "unsigned int"
+
+ if self.states.__len__() > 1000000:
+ raise Exception("Too many states: %d" % self.states.__len__())
+
+ return min_type
+
+ def format_automaton_definition(self):
+ min_type = self.get_minimun_type()
+ buff = []
+ buff.append("struct %s {" % self.struct_automaton_def)
+ buff.append("\tchar *state_names[state_max%s];" % (self.enum_suffix))
+ buff.append("\tchar *event_names[event_max%s];" % (self.enum_suffix))
+ buff.append("\t%s function[state_max%s][event_max%s];" % (min_type, self.enum_suffix, self.enum_suffix))
+ buff.append("\t%s initial_state;" % min_type)
+ buff.append("\tbool final_states[state_max%s];" % (self.enum_suffix))
+ buff.append("};\n")
+ return buff
+
+ def format_aut_init_header(self):
+ buff = []
+ buff.append("struct %s %s = {" % (self.struct_automaton_def, self.var_automaton_def))
+ return buff
+
+ def __get_string_vector_per_line_content(self, buff):
+ first = True
+ string = ""
+ for entry in buff:
+ if first:
+ string = string + "\t\t\"" + entry
+ first = False;
+ else:
+ string = string + "\",\n\t\t\"" + entry
+ string = string + "\""
+
+ return string
+
+ def get_aut_init_events_string(self):
+ return self.__get_string_vector_per_line_content(self.events)
+
+ def get_aut_init_states_string(self):
+ return self.__get_string_vector_per_line_content(self.states)
+
+ def format_aut_init_events_string(self):
+ buff = []
+ buff.append("\t.event_names = {")
+ buff.append(self.get_aut_init_events_string())
+ buff.append("\t},")
+ return buff
+
+ def format_aut_init_states_string(self):
+ buff = []
+ buff.append("\t.state_names = {")
+ buff.append(self.get_aut_init_states_string())
+ buff.append("\t},")
+
+ return buff
+
+ def __get_max_strlen_of_states(self):
+ max_state_name = max(self.states, key = len).__len__()
+ return max(max_state_name, self.invalid_state_str.__len__())
+
+ def __get_state_string_length(self):
+ maxlen = self.__get_max_strlen_of_states() + self.enum_suffix.__len__()
+ return "%" + str(maxlen) + "s"
+
+ def get_aut_init_function(self):
+ nr_states = self.states.__len__()
+ nr_events = self.events.__len__()
+ buff = []
+
+ strformat = self.__get_state_string_length()
+
+ for x in range(nr_states):
+ line = "\t\t{ "
+ for y in range(nr_events):
+ next_state = self.function[x][y]
+ if next_state != self.invalid_state_str:
+ next_state = self.function[x][y] + self.enum_suffix
+
+ if y != nr_events-1:
+ line = line + strformat % next_state + ", "
+ else:
+ line = line + strformat % next_state + " },"
+ buff.append(line)
+
+ return self.__buff_to_string(buff)
+
+ def format_aut_init_function(self):
+ buff = []
+ buff.append("\t.function = {")
+ buff.append(self.get_aut_init_function())
+ buff.append("\t},")
+
+ return buff
+
+ def get_aut_init_initial_state(self):
+ return self.initial_state
+
+ def format_aut_init_initial_state(self):
+ buff = []
+ initial_state = self.get_aut_init_initial_state()
+ buff.append("\t.initial_state = " + initial_state + self.enum_suffix + ",")
+
+ return buff
+
+ def get_aut_init_final_states(self):
+ line = ""
+ first = True
+ for state in self.states:
+ if first == False:
+ line = line + ', '
+ else:
+ first = False
+
+ if self.final_states.__contains__(state):
+ line = line + '1'
+ else:
+ line = line + '0'
+ return line
+
+ def format_aut_init_final_states(self):
+ buff = []
+ buff.append("\t.final_states = { %s }," % self.get_aut_init_final_states())
+
+ return buff
+
+ def __get_automaton_initialization_footer_string(self):
+ footer = "};\n"
+ return footer
+
+ def format_aut_init_footer(self):
+ buff = []
+ buff.append(self.__get_automaton_initialization_footer_string())
+
+ return buff
+
+ def format_invalid_state(self):
+ buff = []
+ buff.append("#define %s state_max%s\n" % (self.invalid_state_str, self.enum_suffix))
+
+ return buff
+
+ def format_model(self):
+ buff = []
+ buff += self.format_states_enum()
+ buff += self.format_invalid_state()
+ buff += self.format_events_enum()
+ buff += self.format_automaton_definition()
+ buff += self.format_aut_init_header()
+ buff += self.format_aut_init_states_string()
+ buff += self.format_aut_init_events_string()
+ buff += self.format_aut_init_function()
+ buff += self.format_aut_init_initial_state()
+ buff += self.format_aut_init_final_states()
+ buff += self.format_aut_init_footer()
+
+ return buff
+
+ def print_model_classic(self):
+ buff = self.format_model()
+ print(self.__buff_to_string(buff))
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