def test_path(self):
model = BmcModel(self.fsm)
noinit = model.path(3, with_init=False)
w_init = model.path(3)
self.assertEqual(w_init, (noinit & model.init[0]))
self.assertEqual(noinit, model.unrolling(0, 3))
def generate_path(offset, length):
"""
Returns a boolean expression representing a path of length `length` in the
fsm described by the loaded model.
:param length: the length of the path in the fsm
:param offset: the offset at which the path should be starting
:return: a boolean expression representing a path of length `length` in the
loaded fsm.
"""
model = BmcModel()
path = model.init[offset] & model.unrolling(offset, offset + length)
return path
def generate_path(offset, length):
"""
Returns a boolean expression representing a path of length `length` in the
fsm described by the loaded model.
:param length: the length of the path in the fsm
:param offset: the offset at which the path should be starting
:return: a boolean expression representing a path of length `length` in the
loaded fsm.
"""
model = BmcModel()
path = model.init[offset] & model.unrolling(offset, offset + length)
return path
def test_generate_inductive_step(self):
# INDUCT = (P0 and R01) -> P1
for prop in prop_database():
expr = utils.make_nnf_boolean_wff(prop.expr)
gen = invarspec.generate_inductive_step(self.fsm, expr)
#
model = BmcModel()
r01 = model.unrolling(0, 1)
# recall: the prop has to be shifted to time 0
p = expr.to_be(self.fsm.encoding)
p0 = self.fsm.encoding.shift_to_time(p, 0)
p1 = self.fsm.encoding.shift_to_time(p, 1)
manual= (p0 & r01).imply(p1)
self.assertEqual(gen.to_cnf().vars_list, manual.to_cnf().vars_list)
def test_generate_inductive_step(self):
# INDUCT = (P0 and R01) -> P1
for prop in prop_database():
expr = utils.make_nnf_boolean_wff(prop.expr)
gen = invarspec.generate_inductive_step(self.fsm, expr)
#
model = BmcModel()
r01 = model.unrolling(0, 1)
# recall: the prop has to be shifted to time 0
p = expr.to_be(self.fsm.encoding)
p0 = self.fsm.encoding.shift_to_time(p, 0)
p1 = self.fsm.encoding.shift_to_time(p, 1)
manual = (p0 & r01).imply(p1)
self.assertEqual(gen.to_cnf().vars_list, manual.to_cnf().vars_list)
def test_unrolling(self):
# comparing the clauses list is not feasible because of the formula
# literal which is embedded in the clauses and vary from one implem
# to the next
# Thus, this test lets us at least get some confidence about the
# equivalence between the two Be's
def manual_unrolling(j, bound):
trans = Be.true(self.enc.manager)
for k in range(j, bound):
trans = trans & self.enc.shift_to_time(self.fsm.trans, k)
return trans
model = BmcModel(self.fsm)
manual = manual_unrolling(4, 5)
tested = model.unrolling(4,5)
# because the var ordering does not matter at all
manual_set = set(manual.to_cnf().vars_list)
tested_set = set(tested.to_cnf().vars_list)
self.assertEqual(manual_set, tested_set)