convert-constraint-log-to-z3.py
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#!/usr/bin/env python
"""
Helper script to convert the log generated by '-debug-only=constraint-system'
to a Python script that uses Z3 to verify the decisions using Z3's Python API.
Example usage:
> cat path/to/file.log
---
x6 + -1 * x7 <= -1
x6 + -1 * x7 <= -2
sat
> ./convert-constraint-log-to-z3.py path/to/file.log > check.py && python ./check.py
> cat check.py
from z3 import *
x3 = Int("x3")
x1 = Int("x1")
x2 = Int("x2")
s = Solver()
s.add(x1 + -1 * x2 <= 0)
s.add(x2 + -1 * x3 <= 0)
s.add(-1 * x1 + x3 <= -1)
assert(s.check() == unsat)
print('all checks passed')
"""
import argparse
import re
def main():
parser = argparse.ArgumentParser(
description='Convert constraint log to script to verify using Z3.')
parser.add_argument('log_file', metavar='log', type=str,
help='constraint-system log file')
args = parser.parse_args()
content = ''
with open(args.log_file, 'rt') as f:
content = f.read()
groups = content.split('---')
var_re = re.compile('x\d+')
print('from z3 import *')
for group in groups:
constraints = [g.strip() for g in group.split('\n') if g.strip() != '']
variables = set()
for c in constraints[:-1]:
for m in var_re.finditer(c):
variables.add(m.group())
if len(variables) == 0:
continue
for v in variables:
print('{} = Int("{}")'.format(v, v))
print('s = Solver()')
for c in constraints[:-1]:
print('s.add({})'.format(c))
expected = constraints[-1].strip()
print('assert(s.check() == {})'.format(expected))
print('print("all checks passed")')
if __name__ == '__main__':
main()