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model_checking.py
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model_checking.py
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import bppy as bp
from bppy import BEvent, sync, SimpleEventSelectionStrategy
from bppy.analysis.dfs_bprogram_verifier import DFSBProgramVerifier
from bppy.analysis.symbolic_bprogram_verifier import SymbolicBProgramVerifier
@bp.thread
def req_1():
while True:
yield sync(request=BEvent("Approaching"))
yield sync(request=BEvent("Entering"))
yield sync(request=BEvent("Leaving"))
@bp.thread
def req_2():
while True:
yield sync(waitFor=BEvent("Approaching"))
yield sync(request=BEvent("Lower"))
yield sync(waitFor=BEvent("Leaving"))
yield sync(request=BEvent("Raise"))
@bp.thread
def req_3():
while True:
yield sync(waitFor=BEvent("Approaching"))
yield sync(block=BEvent("Entering"),
waitFor=BEvent("Lower"))
@bp.thread
def req_4():
while True:
yield sync(waitFor=BEvent("Approaching"))
yield sync(block=BEvent("Raise"),
waitFor=BEvent("Leaving"))
@bp.thread
def check():
while True:
e = yield bp.sync(waitFor=[BEvent("Entering"), BEvent("Lower")])
assert e == BEvent("Lower")
yield bp.sync(waitFor=BEvent("Raise"))
def bp_gen():
return bp.BProgram(bthreads=[req_1(), req_2(), req_3(), req_4(), check()],
event_selection_strategy=SimpleEventSelectionStrategy())
# initialize DFS verifier with the b-program generator and specify max_trace_length
ver = DFSBProgramVerifier(bp_gen, max_trace_length=1000)
ok, counter_example = ver.verify()
# check the verification results and print accordingly
if ok:
print("OK")
else:
print("Violation Found")
print("Counterexample:")
print(counter_example)
def init_bprogram():
return bp.BProgram(bthreads=[req_1(), req_2(), req_3(), req_4()],
event_selection_strategy=SimpleEventSelectionStrategy())
ver = SymbolicBProgramVerifier(init_bprogram,
[BEvent("Approaching"), BEvent("Entering"), BEvent("Leaving"), BEvent("Lower"), BEvent("Raise")])
spec = "G ( (event = Approaching) -> (event != Raise U event = Leaving) )"
result, ce = ver.verify(spec=spec,
type="BDD",
find_counterexample=True)
if result:
print("OK")
else:
print("Violation Found")
print("Counterexample:")
print(ce)