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Added smtc "final" statement

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This commit is contained in:
Clifford Wolf 2016-08-27 14:30:36 +02:00
parent 7500b403de
commit adcda6817e
5 changed files with 86 additions and 9 deletions
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57
backends/smt2/smtbmc.py
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@ -121,6 +121,7 @@ if tempind and len(inconstr) != 0:
sys.exit(1)
constr_final_start = None
constr_asserts = defaultdict(list)
constr_assumes = defaultdict(list)
@ -142,6 +143,21 @@ for fn in inconstr:
current_states.add(0)
continue
if tokens[0] == "final":
constr_final = True
if len(tokens) == 1:
current_states = set(["final-%d" % i for i in range(0, num_steps+1)])
constr_final_start = 0
elif len(tokens) == 2:
i = int(tokens[1])
assert i < 0
current_states = set(["final-%d" % i for i in range(-i, num_steps+1)])
constr_final_start = -i if constr_final_start is None else min(constr_final_start, -i)
else:
assert 0
continue
continue
if tokens[0] == "state":
current_states = set()
for token in tokens[1:]:
@ -190,9 +206,13 @@ for fn in inconstr:
assert 0
def get_constr_expr(db, state):
if state not in db:
return "true"
def get_constr_expr(db, state, final=False):
if final:
if ("final-%d" % state) not in db:
return "true"
else:
if state not in db:
return "true"
netref_regex = re.compile(r'(^|[( ])\[(-?[0-9]+:|)([^\]]+)\](?=[ )]|$)')
@ -211,7 +231,7 @@ def get_constr_expr(db, state):
return match.group(1) + expr
expr_list = list()
for expr in db[state]:
for expr in db[("final-%d" % state) if final else state]:
expr = netref_regex.sub(replace_netref, expr)
expr_list.append(expr)
@ -530,9 +550,32 @@ else: # not tempind
smt.write("(pop 1)")
for i in range(step, last_check_step+1):
smt.write("(assert (%s_a s%d))" % (topmod, i))
smt.write("(assert %s)" % get_constr_expr(constr_asserts, i))
if constr_final_start is not None:
for i in range(step, last_check_step+1):
if i < constr_final_start:
continue
print("%s Checking final constraints in step %d.." % (smt.timestamp(), i))
smt.write("(push 1)")
smt.write("(assert %s)" % get_constr_expr(constr_assumes, i, final=True))
smt.write("(assert (not %s))" % get_constr_expr(constr_asserts, i, final=True))
if smt.check_sat() == "sat":
print("%s BMC failed!" % smt.timestamp())
print_failed_asserts(topmod, "s%d" % i, topmod)
write_trace(i)
retstatus = False
break
smt.write("(pop 1)")
if not retstatus:
break
if constr_final_start is None:
for i in range(step, last_check_step+1):
smt.write("(assert (%s_a s%d))" % (topmod, i))
smt.write("(assert %s)" % get_constr_expr(constr_asserts, i))
if gentrace:
print("%s Solving for step %d.." % (smt.timestamp(), step))