def check_automaton_init(s: Solver, a: AutomatonDecl) -> None:
utils.logger.always_print('checking automaton init:')
prog = syntax.the_program
t = s.get_translator(KEY_ONE)
init_decl = a.the_init()
assert init_decl is not None # checked by resolver
init_phase = prog.scope.get_phase(init_decl.phase)
assert init_phase is not None # checked by resolver
with s:
for init in prog.inits():
s.add(t.translate_expr(init.expr))
for inv in init_phase.invs():
with s:
s.add(z3.Not(t.translate_expr(inv.expr)))
if inv.tok is not None:
msg = ' on line %d' % inv.tok.lineno
else:
msg = ''
utils.logger.always_print(' implies phase invariant%s... ' %
msg,
end='')
sys.stdout.flush()
logic.check_unsat([
(inv.tok,
'phase invariant%s may not hold in initial state' % msg)
], s, [KEY_ONE])
def __init__(self, automaton_decl: AutomatonDecl) -> None:
self.automaton_decl = automaton_decl
self._phases: Dict[str, Phase] = OrderedDict()
for p in self.automaton_decl.phases():
self._phases[p.name] = Phase(p)
self._transitions = [
PhaseTransition(
self._phases[p.name],
self._phases[(delta.target
if delta.target is not None else p.name)], delta)
for p in self.automaton_decl.phases() for delta in p.transitions()
]
init_decl = automaton_decl.the_init()
assert init_decl is not None
self._init_phase = self._phases[init_decl.phase]
self.nontrivial = len(self._phases) > 1