def test_apply_inlining_for_incremental_algo(self):
load_from_string("""
MODULE main
VAR v : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
mdl = bmcutils.BmcModel()
enc = mdl._fsm.encoding
v = enc.by_name['v'].boolean_expression
cond = v & v & v | v
self.assertEqual(
cond.inline(True),
bmcutils.apply_inlining_for_incremental_algo(cond))
cond = v | -v
self.assertEqual(
cond.inline(True),
bmcutils.apply_inlining_for_incremental_algo(cond))
cond = v & -v
self.assertEqual(
cond.inline(True),
bmcutils.apply_inlining_for_incremental_algo(cond))
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_make_negated_nnf_boolean_wff(self):
load_from_string("""
MODULE main
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
expr = Node.from_ptr(parse_ltl_spec("F G ( w <-> v )"))
wff = bmcutils.make_negated_nnf_boolean_wff(expr)
self.assertEquals(" F ( G (w <-> v))", str(expr))
# Via De Morgan Laws
self.assertEquals(" G ( F ((v & !w) | (!v & w)))", str(wff))
def test_make_nnf_boolean_wff(self):
load_from_string("""
MODULE main
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
expr = Node.from_ptr(parse_ltl_spec("F G ( w <-> v )"))
wff = bmcutils.make_nnf_boolean_wff(expr)
self.assertEquals(" F ( G (w <-> v))", str(expr))
self.assertEquals(" F ( G ((!v | w) & (v | !w)))", str(wff))
self.assertEquals(Wff, type(wff))
def test_dump_problem(self):
load_from_string("""
MODULE main
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
LTLSPEC F G ( w <-> v )
""")
with BmcSupport():
fsm = master_be_fsm()
for prop in prop_database():
pb = generate_ltl_problem(fsm, prop.expr)
bmcutils.dump_problem(fsm.encoding, pb.to_cnf(), prop, 10, 0,
bmcutils.DumpType.DIMACS, "dimacs_dump")
def test_booleanize(self):
load_from_string("""
MODULE main
VAR
-- requires two bits
i : 0..3;
-- requires no transformation
b : boolean;
""")
with BmcSupport():
# fails for non existing symbols
with self.assertRaises(ValueError):
bmcutils.booleanize("c")
# works as expected for existing vars
self.assertEqual("[i.1, i.0]", str(bmcutils.booleanize("i")))
self.assertEqual("[b]", str(bmcutils.booleanize("b")))
def test_get_symbol(self):
load_from_string("""
MODULE main
VAR w : boolean;
IVAR x : boolean;
FROZENVAR y : boolean;
DEFINE z := (x & w);
""")
with BmcSupport():
# fails when not found
with self.assertRaises(ValueError):
bmcutils.get_symbol("a")
# works for all types of vars
self.assertEqual("w", str(bmcutils.get_symbol("w")))
self.assertEqual("x", str(bmcutils.get_symbol("x")))
self.assertEqual("y", str(bmcutils.get_symbol("y")))
self.assertEqual("z", str(bmcutils.get_symbol("z")))
def test_loop_condition_single_var(self):
# test case 1: model with one single var
load_from_string("""
MODULE main
VAR v : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
mdl = bmcutils.BmcModel()
enc = mdl._fsm.encoding
cond = bmcutils.loop_condition(enc, 3, 1)
v3 = enc.by_name['v'].at_time[3].boolean_expression
v1 = enc.by_name['v'].at_time[1].boolean_expression
cond2 = v1.iff(v3)
self.assertEqual(cond, cond2)
def test_loop_condition_consistent_values(self):
# test case 3: only the state variables are considered
load_from_string("""
MODULE main
IVAR i : boolean;
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
mdl = bmcutils.BmcModel()
enc = mdl._fsm.encoding
# loop and bound must be consistent (bound >= 0)
with self.assertRaises(ValueError):
bmcutils.loop_condition(enc, -5, 1)
# loop and bound must be consistent (loop <= bound)
with self.assertRaises(ValueError):
bmcutils.loop_condition(enc, 2, 5)
def test_apply_inlining(self):
load_from_string("""
MODULE main
VAR v : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
mdl = bmcutils.BmcModel()
enc = mdl._fsm.encoding
mgr = enc.manager
v = enc.by_name['v'].boolean_expression
cond = v & v & v | v
self.assertEqual(v, bmcutils.apply_inlining(cond))
cond = v | -v
self.assertEqual(Be.true(mgr), bmcutils.apply_inlining(cond))
cond = v & -v
self.assertEqual(Be.false(mgr), bmcutils.apply_inlining(cond))
def test_loop_condition_two_var(self):
# test case 1: model with one more variables
load_from_string("""
MODULE main
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
mdl = bmcutils.BmcModel()
enc = mdl._fsm.encoding
cond = bmcutils.loop_condition(enc, 3, 1)
v = enc.by_name['v']
w = enc.by_name['w']
cond2 = (v.at_time[1].boolean_expression.iff(
v.at_time[3].boolean_expression)
& w.at_time[1].boolean_expression.iff(
w.at_time[3].boolean_expression))
self.assertEqual(cond, cond2)
def test_loop_condition_not_only_state(self):
# test case 3: only the state variables are considered
load_from_string("""
MODULE main
IVAR i : boolean;
VAR v : boolean;
w : boolean;
ASSIGN init(v) := TRUE;
next(v) := !v;
""")
with BmcSupport():
mdl = bmcutils.BmcModel()
enc = mdl._fsm.encoding
cond = bmcutils.loop_condition(enc, 3, 1)
v = enc.by_name['v']
w = enc.by_name['w']
cond2 = (v.at_time[1].boolean_expression.iff(
v.at_time[3].boolean_expression)
& w.at_time[1].boolean_expression.iff(
w.at_time[3].boolean_expression))
self.assertEqual(cond, cond2)
