smt_pop()
break
if append_steps > 0:
for i in range(step+1, step+1+append_steps):
print_msg("Appending additional step %d." % i)
smt_state(i)
smt_assert_antecedent("(not (|%s_is| s%d))" % (topmod, i))
smt_assert_consequent("(|%s_u| s%d)" % (topmod, i))
smt_assert_antecedent("(|%s_h| s%d)" % (topmod, i))
smt_assert_antecedent("(|%s_t| s%d s%d)" % (topmod, i-1, i))
smt_assert_consequent(get_constr_expr(constr_assumes, i))
print_msg("Re-solving with appended steps..")
assert smt_check_sat() == "sat"
reached_covers = smt.bv2bin(smt.get("(covers_%d s%d)" % (coveridx, step)))
assert len(reached_covers) == len(cover_desc)
new_cover_mask = []
for i in range(len(reached_covers)):
if reached_covers[i] == "0":
new_cover_mask.append(cover_mask[i])
continue
print_msg("Reached cover statement at %s in step %d." % (cover_desc[i], step))
new_cover_mask.append("0")
cover_mask = "".join(new_cover_mask)
for i in range(step+1+append_steps):
if append_steps > 0:
for i in range(step + 1, step + 1 + append_steps):
print_msg("Appending additional step %d." % i)
smt.write("(declare-fun s%d () |%s_s|)" % (i, topmod))
smt.write("(assert (not (|%s_is| s%d)))" % (topmod, i))
smt.write("(assert (|%s_u| s%d))" % (topmod, i))
smt.write("(assert (|%s_h| s%d))" % (topmod, i))
smt.write("(assert (|%s_t| s%d s%d))" % (topmod, i - 1, i))
smt.write("(assert %s)" %
get_constr_expr(constr_assumes, i))
print_msg("Re-solving with appended steps..")
assert smt.check_sat() == "sat"
reached_covers = smt.bv2bin(
smt.get("(covers_%d s%d)" % (coveridx, step)))
assert len(reached_covers) == len(cover_desc)
new_cover_mask = []
for i in range(len(reached_covers)):
if reached_covers[i] == "0":
new_cover_mask.append(cover_mask[i])
continue
print_msg("Reached cover statement at %s in step %d." %
(cover_desc[i], step))
new_cover_mask.append("0")
cover_mask = "".join(new_cover_mask)
smt.write("(assert (|%s_is| s0))" % (topmod))
else:
smt.write("(assert (|%s_t| s%d s%d))" % (topmod, step-1, step))
smt.write("(assert (not (|%s_is| s%d)))" % (topmod, step))
while "1" in cover_mask:
print_msg("Checking cover reachability in step %d.." % (step))
smt.write("(push 1)")
smt.write("(assert (distinct (covers_%d s%d) #b%s))" % (coveridx, step, "0" * len(cover_desc)))
if smt.check_sat() == "unsat":
smt.write("(pop 1)")
break
reached_covers = smt.bv2bin(smt.get("(covers_%d s%d)" % (coveridx, step)))
assert len(reached_covers) == len(cover_desc)
new_cover_mask = []
for i in range(len(reached_covers)):
if reached_covers[i] == "0":
new_cover_mask.append(cover_mask[i])
continue
print_msg("Reached cover statement at %s in step %d." % (cover_desc[i], step))
new_cover_mask.append("0")
cover_mask = "".join(new_cover_mask)
for i in range(step+1):
