def test_is_loopback_when_frozen(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
# empty trace
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
step1 = trace.steps[1]
step2 = trace.append_step()
yes = Node.from_ptr(parse_simple_expression("TRUE"))
no = Node.from_ptr(parse_simple_expression("FALSE"))
v = be_fsm.encoding.by_name['v'].name
step1 += (v, yes)
step2 += (v, no)
trace.freeze()
step1.force_loopback()
self.assertTrue(step1.is_loopback)
self.assertFalse(step2.is_loopback)
step2.force_loopback()
self.assertTrue(step1.is_loopback)
# last step is never a loopback
self.assertFalse(step2.is_loopback)
trace.thaw()
self.assertFalse(step1.is_loopback)
self.assertFalse(step2.is_loopback)
def test_iter(self):
"""tests the behavior of assign and value"""
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
# empty trace
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
step1 = trace.steps[1]
yes = Node.from_ptr(parse_simple_expression("TRUE"))
no = Node.from_ptr(parse_simple_expression("FALSE"))
v = be_fsm.encoding.by_name["v"].name
self.assertEqual([], list(step1))
step1 += v, yes
self.assertEqual([(v, yes)], list(step1))
# += really ASSIGNS a value, not append
step1 += v, no
self.assertEqual([(v, no)], list(step1))
def generate_counter_example(fsm,
problem,
solver,
k,
descr="BMC counter example"):
"""
Generates a counter example for `problem` evaluated against `fsm` as
identified by `solver` (problem has a length `k`) but prints nothing.
.. note::
If you are looking for something more advanced, you might want to look
at :func:`pynusmv.be.encoder.BeEnc.decode_sat_model` which does the same
thing but is more complete.
:param fsm: the FSM against which problem was evaluated
:param problem: the SAT problem used to identify a counter example
:param solver: the SAT solver that identified a counter example
:param k: the length of the generated problem (length in terms of state)
:param descr: a description of what the generated counter example is about
:raises ValueError: whenever the problem or the solver is None or when the
problem bound `k` is negative.
"""
if problem is None:
raise ValueError("a problem must be given")
if solver is None:
raise ValueError("a solver must be given")
if k < 0:
raise ValueError("the problem bound `k` must be non negative")
ptr = _bmc.Bmc_Utils_generate_cntexample(
fsm.encoding._ptr, solver._as_SatSolver_ptr(), problem._ptr, k, descr,
glob.master_bool_sexp_fsm().symbols_list._ptr)
return Trace(ptr)
def test_steps(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
# must raise an exception when the indice is not valid
with self.assertRaises(KeyError):
trace.steps[-1]
with self.assertRaises(KeyError):
trace.steps[0]
with self.assertRaises(KeyError):
trace.steps[2]
self.assertIsNotNone(trace.steps[1])
# once a step is appended, we can access one offset further
step2 = trace.append_step()
self.assertEquals(step2, trace.steps[2])
def test_concat(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
spec = Node.from_ptr(parse_ltl_spec("F (w <-> v)"))
bound = 2
problem = generate_ltl_problem(be_fsm, spec,
bound=bound) #.inline(True)
cnf = problem.to_cnf()
solver = SatSolverFactory.create()
solver += cnf
solver.polarity(cnf, Polarity.POSITIVE)
solver.solve()
other = generate_counter_example(be_fsm, problem, solver, bound)
trace.concat(other)
self.assertEquals(-1, trace.id)
self.assertFalse(trace.is_registered)
self.assertEquals("Dummy example", trace.description)
self.assertEquals(TraceType.COUNTER_EXAMPLE, trace.type)
self.assertTrue(trace.is_volatile)
self.assertEquals(2, trace.length)
self.assertEquals(2, len(trace))
self.assertFalse(trace.is_empty)
self.assertFalse(trace.is_frozen)
self.assertTrue(trace.is_thawed)
def test_fill_counter_example(self):
load_from_string("""
MODULE main
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
init(w) := FALSE;
next(w) := !w;
""")
with BmcSupport():
bound = 2
fsm = master_be_fsm()
sexpfsm = master_bool_sexp_fsm()
expr = Node.from_ptr(parse_ltl_spec("F ( w <-> v )"))
pb = generate_ltl_problem(fsm, expr, bound=bound)
cnf = pb.inline(True).to_cnf()
solver = SatSolverFactory.create()
solver += cnf
solver.polarity(cnf, Polarity.POSITIVE)
self.assertEqual(SatSolverResult.SATISFIABLE, solver.solve())
trace = Trace.create("FILLED", TraceType.COUNTER_EXAMPLE,
sexpfsm.symbol_table, sexpfsm.symbols_list,
True)
bmcutils.fill_counter_example(fsm, solver, bound, trace)
self.assertIsNotNone(trace)
self.assertEqual(2, len(trace))
print(trace)
def test_force_loopback(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
# empty trace
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
step1 = trace.steps[1]
# because last step is never a loopback
trace.append_step()
# must fail when trace is thawed
with self.assertRaises(NuSmvIllegalTraceStateError):
step1.force_loopback()
trace.freeze()
self.assertFalse(step1.is_loopback)
step1.force_loopback()
self.assertTrue(step1.is_loopback)
def test_language_contains(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
v = be_fsm.encoding.by_name["v"]
w = be_fsm.encoding.by_name["w"]
f = be_fsm.encoding.by_name["f"]
i = be_fsm.encoding.by_name["i"]
self.assertTrue(v.name in trace)
self.assertTrue(w.name in trace)
self.assertTrue(f.name in trace)
self.assertTrue(i.name in trace)
x = parse_simple_expression("x")
self.assertFalse(Node.from_ptr(x) in trace)
def test_iter(self):
"""tests the behavior of assign and value"""
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
# empty trace
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
step1 = trace.steps[1]
yes = Node.from_ptr(parse_simple_expression("TRUE"))
no = Node.from_ptr(parse_simple_expression("FALSE"))
v = be_fsm.encoding.by_name['v'].name
self.assertEqual([], list(step1))
step1 += v, yes
self.assertEqual([(v, yes)], list(step1))
# += really ASSIGNS a value, not append
step1 += v, no
self.assertEqual([(v, no)], list(step1))
def test_assign_value__magicmethod__(self):
"""tests the behavior of assign and value"""
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
# empty trace
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
step1 = trace.steps[1]
yes = Node.from_ptr(parse_simple_expression("TRUE"))
no = Node.from_ptr(parse_simple_expression("FALSE"))
v = be_fsm.encoding.by_name["v"].name
self.assertIsNone(step1.value[v])
step1 += (v, yes)
self.assertEqual(yes, step1.value[v])
step1 += (v, no)
self.assertEqual(no, step1.value[v])
def test_input_var(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
self.assertEquals("NodeList[i]", str(trace.input_vars))
def test_register(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
trace.register(42)
self.assertEquals(42, trace.id)
self.assertTrue(trace.is_registered)
def test_iter(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
self.assertEquals(list(trace.__iter__()), [trace.steps[1]])
step2 = trace.append_step()
self.assertEquals(list(trace.__iter__()), [trace.steps[1], step2])
def test_input_var(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
self.assertEquals("NodeList[i]", str(trace.input_vars))
def test_append_step(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
self.assertEquals(0, len(trace))
step = trace.append_step()
self.assertIsNotNone(step)
self.assertEquals(TraceStep, type(step))
self.assertEquals(1, len(trace))
def test_iter(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
self.assertEquals(list(trace.__iter__()), [trace.steps[1]])
step2 = trace.append_step()
self.assertEquals(list(trace.__iter__()), [trace.steps[1], step2])
def test_register(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
trace.register(42)
self.assertEquals(42, trace.id)
self.assertTrue(trace.is_registered)
def test_append_step(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
self.assertEquals(0, len(trace))
step = trace.append_step()
self.assertIsNotNone(step)
self.assertEquals(TraceStep, type(step))
self.assertEquals(1, len(trace))
def test_freeze(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
trace.freeze()
self.assertTrue(trace.is_frozen)
self.assertFalse(trace.is_thawed)
# it may be called two times in a row
trace.freeze()
self.assertTrue(trace.is_frozen)
self.assertFalse(trace.is_thawed)
def test_freeze(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
trace.freeze()
self.assertTrue(trace.is_frozen)
self.assertFalse(trace.is_thawed)
# it may be called two times in a row
trace.freeze()
self.assertTrue(trace.is_frozen)
self.assertFalse(trace.is_thawed)
def test_is_complete(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
# vacuously true
self.assertTrue(trace.is_complete(NodeList.from_list([])))
v = be_fsm.encoding.by_name['v'].name
self.assertFalse(trace.is_complete(NodeList.from_list([v])))
step = trace.steps[1]
yes = Node.from_ptr(parse_simple_expression("TRUE"))
step += (v, yes)
self.assertTrue(trace.is_complete(NodeList.from_list([v])))
def test_create(self):
# This function may not provoke any segfault (even though) freeit is
# manually set to True when creating a trace.
# besides that, the trace must be thawed, empty and have length 0
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
self.assertEquals(-1, trace.id)
self.assertFalse(trace.is_registered)
self.assertEquals("Dummy example", trace.description)
self.assertEquals(TraceType.COUNTER_EXAMPLE, trace.type)
self.assertEquals(0, trace.length)
self.assertTrue(trace.is_empty)
self.assertTrue(trace.is_volatile)
self.assertFalse(trace.is_frozen)
self.assertTrue(trace.is_thawed)
self.assertEquals(list(trace.symbols), list(sexp_fsm.symbols_list))
def test_force_loopback(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
# empty trace
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
step1 = trace.steps[1]
# because last step is never a loopback
trace.append_step()
# must fail when trace is thawed
with self.assertRaises(NuSmvIllegalTraceStateError):
step1.force_loopback()
trace.freeze()
self.assertFalse(step1.is_loopback)
step1.force_loopback()
self.assertTrue(step1.is_loopback)
def test_language_contains(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
v = be_fsm.encoding.by_name['v']
w = be_fsm.encoding.by_name['w']
f = be_fsm.encoding.by_name['f']
i = be_fsm.encoding.by_name['i']
self.assertTrue(v.name in trace)
self.assertTrue(w.name in trace)
self.assertTrue(f.name in trace)
self.assertTrue(i.name in trace)
x = parse_simple_expression("x")
self.assertFalse(Node.from_ptr(x) in trace)
def test_steps(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
# must raise an exception when the indice is not valid
with self.assertRaises(KeyError):
trace.steps[-1]
with self.assertRaises(KeyError):
trace.steps[0]
with self.assertRaises(KeyError):
trace.steps[2]
self.assertIsNotNone(trace.steps[1])
# once a step is appended, we can access one offset further
step2 = trace.append_step()
self.assertEquals(step2, trace.steps[2])
def test_is_loopback_when_frozen(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
# empty trace
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
step1 = trace.steps[1]
step2 = trace.append_step()
yes = Node.from_ptr(parse_simple_expression("TRUE"))
no = Node.from_ptr(parse_simple_expression("FALSE"))
v = be_fsm.encoding.by_name["v"].name
step1 += (v, yes)
step2 += (v, no)
trace.freeze()
step1.force_loopback()
self.assertTrue(step1.is_loopback)
self.assertFalse(step2.is_loopback)
step2.force_loopback()
self.assertTrue(step1.is_loopback)
# last step is never a loopback
self.assertFalse(step2.is_loopback)
trace.thaw()
self.assertFalse(step1.is_loopback)
self.assertFalse(step2.is_loopback)
def test_assign_value__magicmethod__(self):
"""tests the behavior of assign and value"""
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
# empty trace
trace = Trace.create("Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True)
step1 = trace.steps[1]
yes = Node.from_ptr(parse_simple_expression("TRUE"))
no = Node.from_ptr(parse_simple_expression("FALSE"))
v = be_fsm.encoding.by_name['v'].name
self.assertIsNone(step1.value[v])
step1 += (v, yes)
self.assertEqual(yes, step1.value[v])
step1 += (v, no)
self.assertEqual(no, step1.value[v])
def test_concat(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
spec = Node.from_ptr(parse_ltl_spec("F (w <-> v)"))
bound = 2
problem = generate_ltl_problem(be_fsm, spec, bound=bound) # .inline(True)
cnf = problem.to_cnf()
solver = SatSolverFactory.create()
solver += cnf
solver.polarity(cnf, Polarity.POSITIVE)
solver.solve()
other = generate_counter_example(be_fsm, problem, solver, bound)
trace.concat(other)
self.assertEquals(-1, trace.id)
self.assertFalse(trace.is_registered)
self.assertEquals("Dummy example", trace.description)
self.assertEquals(TraceType.COUNTER_EXAMPLE, trace.type)
self.assertTrue(trace.is_volatile)
self.assertEquals(2, trace.length)
self.assertEquals(2, len(trace))
self.assertFalse(trace.is_empty)
self.assertFalse(trace.is_frozen)
self.assertTrue(trace.is_thawed)
def test_is_complete(self):
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
be_fsm = master_be_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
# vacuously true
self.assertTrue(trace.is_complete(NodeList.from_list([])))
v = be_fsm.encoding.by_name["v"].name
self.assertFalse(trace.is_complete(NodeList.from_list([v])))
step = trace.steps[1]
yes = Node.from_ptr(parse_simple_expression("TRUE"))
step += (v, yes)
self.assertTrue(trace.is_complete(NodeList.from_list([v])))
def test_create(self):
# This function may not provoke any segfault (even though) freeit is
# manually set to True when creating a trace.
# besides that, the trace must be thawed, empty and have length 0
with BmcSupport():
sexp_fsm = master_bool_sexp_fsm()
trace = Trace.create(
"Dummy example",
TraceType.COUNTER_EXAMPLE,
sexp_fsm.symbol_table,
sexp_fsm.symbols_list,
is_volatile=True,
)
self.assertEquals(-1, trace.id)
self.assertFalse(trace.is_registered)
self.assertEquals("Dummy example", trace.description)
self.assertEquals(TraceType.COUNTER_EXAMPLE, trace.type)
self.assertEquals(0, trace.length)
self.assertTrue(trace.is_empty)
self.assertTrue(trace.is_volatile)
self.assertFalse(trace.is_frozen)
self.assertTrue(trace.is_thawed)
self.assertEquals(list(trace.symbols), list(sexp_fsm.symbols_list))