def test_change_trans_of_flat(self):
glob.load(*self.counters())
glob.flatten_hierarchy()
flat = glob.flat_hierarchy()
self.assertIsNotNone(flat)
trans = flat.trans
choose_run = node.Expression.from_string("run = rc1")
flat.trans = flat.trans & choose_run
glob.compute_model()
fsm = glob.prop_database().master.bddFsm
self.assertEqual(fsm.count_states(fsm.reachable_states), 3)
def test_change_trans_of_flat(self):
glob.load(*self.counters())
glob.flatten_hierarchy()
flat = glob.flat_hierarchy()
self.assertIsNotNone(flat)
trans = flat.trans
choose_run = node.Expression.from_string("run = rc1")
flat.trans = flat.trans & choose_run
glob.compute_model()
fsm = glob.prop_database().master.bddFsm
self.assertEqual(fsm.count_states(fsm.reachable_states), 3)
def test_access_flat_hierarchy(self):
glob.load(*self.counters())
glob.compute_model()
flat = glob.flat_hierarchy()
symb_table = glob.symb_table()
self.assertIsNotNone(flat.init)
self.assertIsNotNone(flat.trans)
self.assertIsNone(flat.invar)
self.assertIsNone(flat.justice)
self.assertIsNone(flat.compassion)
variables = flat.variables
for variable in variables:
var_type = symb_table.get_variable_type(variable)
self.assertEqual(nssymb_table.SymbType_get_tag(var_type),
nssymb_table.SYMB_TYPE_ENUM)
def test_access_flat_hierarchy(self):
glob.load(*self.counters())
glob.compute_model()
flat = glob.flat_hierarchy()
symb_table = glob.symb_table()
self.assertIsNotNone(flat.init)
self.assertIsNotNone(flat.trans)
self.assertIsNone(flat.invar)
self.assertIsNone(flat.justice)
self.assertIsNone(flat.compassion)
variables = flat.variables
for variable in variables:
var_type = symb_table.get_variable_type(variable)
self.assertEqual(nssymb_table.SymbType_get_tag(var_type),
nssymb_table.SYMB_TYPE_ENUM)
def jump_relation(mas):
"""
Return the transition relation corresponding to the "jump" relation of the
given MAS.
mas -- a multi-agents system.
The returned value is a model-based relation encoding the fact that all
original state variables of the given MAS stay the same, and other encoded
variables are free to change.
"""
# Get the original state variables
flat = glob.flat_hierarchy()
symb_table = mas.bddEnc.symbTable
original_variables = [
variable for variable in flat.variables
if symb_table.is_state_var(variable)
]
# Build the relation expression
return reduce(operator.and_, (variable.next() == variable
for variable in original_variables))
def encode_strategies(mas, agents, formula, filtered):
"""
Encode the strategies for agents, to check formula, given the filtered
moves.
mas -- a multi-agents system;
agents -- a subset of agents of mas;
formula -- an ATLK_irF strategic formula where the group is agents;
filtered -- either the complete protocol of the agents, or the filtered
moves for agents, for the given formula.
The result is the presence, in mas.transitions[formula], of three relations
under the "jump", "equiv", and "follow" keys, to perform the model
checking:
* the "jump" relation encode the fact that the original state stays the
same and all strategies can change;
* the "equiv" relation encode the fact that the states are equivalent
for some agent in the group of formula, and the strategies of these
agents are kept the same;
* the "follow" relation encode the original transition relation with
each agent of the group of formula following his strategy encoded
in the current state (and that these strategies are kept the same).
Note: mas.encoded is populated with intermediate cached information:
* mas.encoded[(agent, filtered)] gives two (model-based) relations:
+ the relation encoding the fact that the encoded strategies of agent
from filtered are kept the same;
+ the relation encoding the fact that the encoded strategies of agent
are followed;
they only depends on the agent and the filtered moves, thus if two
sub-formulas have the same filtered moves (e.g., pre-filtering is
not used), the relations are the same;
* mas.encoded[agent] gives the relation encoding the equivalence for
agent;
it only depends on agent, since it only depends on what he observes;
THIS RELATION DOES NOT ENCODE THE FACT THAT THE STRATEGIES DO NOT
CHANGE;
* mas.encoded["jump"] gives the relation encoding the fact that the
state is the same but the strategies can change;
it only depends on the MAS, since all strategies are free and only
the state is kept identical.
"""
if not hasattr(mas, "transitions"):
mas.transitions = {}
if not hasattr(mas, "encoded"):
mas.encoded = {}
# if mas.encoded["jump"] does not exist,
# encode it, based on the original state variables of the model
if "jump" not in mas.encoded:
jump = jump_relation(mas)
mas.encoded["jump"] = jump
# Encode each agent variables and relations if needed
# for each agent in agents,
# if (agent, filtered) is not in mas.encoded,
# compute them
for agent in agents:
if (agent, filtered) not in mas.encoded:
relations = strategy_relations(mas, agents, agent, filtered)
mas.encoded[(agent, filtered)] = relations
# for each agent in agents,
# if mas.encoded[agent] is not present,
# compute it
for agent in agents:
if agent not in mas.encoded:
relation = equivalence_relation(mas, agent)
mas.encoded[agent] = relation
# Encode the transition relations
if formula not in mas.transitions:
mas.transitions[formula] = {}
# the "jump" relation is just mas.encoded["jump"]
if "jump" not in mas.transitions[formula]:
jump = mas.encoded["jump"]
trans = BddTrans.from_string(mas.bddEnc.symbTable, str(jump))
mas.transitions[formula]["jump"] = trans
# the "equiv" relation is based on
# * the "equiv" relations of each agent in agents
# (disjunction, for group knowledge)
# * the strategies of the agents are the same
# (based on the variables of each agent, stored in
# mas.encoded[(agent, filtered)])
if "equiv" not in mas.transitions[formula]:
equiv = reduce(operator.or_, (mas.encoded[agent] for agent in agents),
model.Falseexp())
equiv = reduce(operator.and_, (mas.encoded[(agent, filtered)][0]
for agent in agents), equiv)
trans = BddTrans.from_string(mas.bddEnc.symbTable, str(equiv))
mas.transitions[formula]["equiv"] = trans
# the "follow" relation is based on
# * the original transition relation of the MAS;
# * the fact that the strategies of the agents are the same,
# and that the strategies for agents are followed by these agents,
# given by the variables in mas.encoded[(agent, filtered)]
if "follow" not in mas.transitions[formula]:
flat = glob.flat_hierarchy()
follow = reduce(operator.and_, (mas.encoded[(agent, filtered)][0]
& mas.encoded[(agent, filtered)][1]
for agent in agents), flat.trans)
trans = BddTrans.from_string(mas.bddEnc.symbTable, str(follow))
mas.transitions[formula]["follow"] = trans
def test_get_flat_hierarchy(self):
with self.assertRaises(NuSMVNeedFlatHierarchyError):
flat = glob.flat_hierarchy()
glob.load_from_file("tests/pynusmv/models/counters.smv")
glob.compute_model()
flat = glob.flat_hierarchy()
