72 lines · python
1#!/usr/bin/env python2 3"""4Helper script to convert the log generated by '-debug-only=constraint-system'5to a Python script that uses Z3 to verify the decisions using Z3's Python API.6 7Example usage:8 9> cat path/to/file.log10---11x6 + -1 * x7 <= -112x6 + -1 * x7 <= -213sat14 15> ./convert-constraint-log-to-z3.py path/to/file.log > check.py && python ./check.py16 17> cat check.py18 from z3 import *19x3 = Int("x3")20x1 = Int("x1")21x2 = Int("x2")22s = Solver()23s.add(x1 + -1 * x2 <= 0)24s.add(x2 + -1 * x3 <= 0)25s.add(-1 * x1 + x3 <= -1)26assert(s.check() == unsat)27print('all checks passed')28"""29 30 31import argparse32import re33 34 35def main():36 parser = argparse.ArgumentParser(37 description="Convert constraint log to script to verify using Z3."38 )39 parser.add_argument(40 "log_file", metavar="log", type=str, help="constraint-system log file"41 )42 args = parser.parse_args()43 44 content = ""45 with open(args.log_file, "rt") as f:46 content = f.read()47 48 groups = content.split("---")49 var_re = re.compile("x\d+")50 51 print("from z3 import *")52 for group in groups:53 constraints = [g.strip() for g in group.split("\n") if g.strip() != ""]54 variables = set()55 for c in constraints[:-1]:56 for m in var_re.finditer(c):57 variables.add(m.group())58 if len(variables) == 0:59 continue60 for v in variables:61 print('{} = Int("{}")'.format(v, v))62 print("s = Solver()")63 for c in constraints[:-1]:64 print("s.add({})".format(c))65 expected = constraints[-1].strip()66 print("assert(s.check() == {})".format(expected))67 print('print("all checks passed")')68 69 70if __name__ == "__main__":71 main()72