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Improve yosys-smtbmc cover() support

This commit is contained in:
Clifford Wolf 2017-02-04 21:10:24 +01:00
parent 0c0784b6bf
commit adbecfee66
1 changed files with 19 additions and 5 deletions
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24
backends/smt2/smtbmc.py
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@ -821,6 +821,7 @@ if tempind:
elif covermode:
cover_expr, cover_desc = get_cover_list(topmod, "state")
cover_mask = "1" * len(cover_desc)
if len(cover_expr) > 1:
cover_expr = "(concat %s)" % " ".join(cover_expr)
@ -851,7 +852,7 @@ elif covermode:
smt.write("(assert (|%s_t| s%d s%d))" % (topmod, step-1, step))
smt.write("(assert (not (|%s_is| s%d)))" % (topmod, step))
while True:
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)))
@ -861,24 +862,37 @@ elif covermode:
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 %s." % cover_desc[i])
print_msg("Reached cover statement at %s in step %d." % (cover_desc[i], step))
new_cover_mask.append("0")
write_trace(0, step+1, "%d" % coveridx)
# TBD
assert False
cover_mask = "".join(new_cover_mask)
if len(cover_desc) == 0:
coveridx += 1
smt.write("(pop 1)")
smt.write("(define-fun covers_%d ((state |%s_s|)) (_ BitVec %d) (bvand (covers_%d state) #b%s))" % (coveridx, topmod, len(cover_desc), coveridx-1, cover_mask))
if "1" not in cover_mask:
retstatus = True
break
step += 1
if "1" in cover_mask:
for i in range(len(cover_mask)):
if cover_mask[i] == "1":
print_msg("Unreached cover statement at %s." % cover_desc[i])
else: # not tempind, covermode
step = 0
retstatus = True