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smtbmc: Fix two .yw handling related crashes #4431

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merged 1 commit into from
Jun 6, 2024
Merged

smtbmc: Fix two .yw handling related crashes #4431

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5 changes: 5 additions & 0 deletions backends/smt2/smtbmc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -719,6 +719,8 @@ def smt_extract_mask(smt_expr, mask):
return combined_chunks, ''.join(mask_index_order[start:end] for start, end in chunks)[::-1]

def smt_concat(exprs):
if not isinstance(exprs, (tuple, list)):
exprs = tuple(exprs)
if not exprs:
return ""
if len(exprs) == 1:
Expand Down Expand Up @@ -818,6 +820,9 @@ def ywfile_constraints(inywfile, constr_assumes, map_steps=None, skip_x=False):
if not bits_re.match(bits):
raise ValueError("unsupported bit value in Yosys witness file")

if bits.count('?') == len(bits):
continue

smt_expr = ywfile_signal(sig, map_steps.get(t, t))

smt_expr, bits = smt_extract_mask(smt_expr, bits)
Expand Down
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