1#!/usr/bin/env python 2 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.log 10--- 11x6 + -1 * x7 <= -1 12x6 + -1 * x7 <= -2 13sat 14 15> ./convert-constraint-log-to-z3.py path/to/file.log > check.py && python ./check.py 16 17> cat check.py 18 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 argparse 32import re 33 34 35def main(): 36 parser = argparse.ArgumentParser( 37 description='Convert constraint log to script to verify using Z3.') 38 parser.add_argument('log_file', metavar='log', type=str, 39 help='constraint-system log file') 40 args = parser.parse_args() 41 42 content = '' 43 with open(args.log_file, 'rt') as f: 44 content = f.read() 45 46 groups = content.split('---') 47 var_re = re.compile('x\d+') 48 49 print('from z3 import *') 50 for group in groups: 51 constraints = [g.strip() for g in group.split('\n') if g.strip() != ''] 52 variables = set() 53 for c in constraints[:-1]: 54 for m in var_re.finditer(c): 55 variables.add(m.group()) 56 if len(variables) == 0: 57 continue 58 for v in variables: 59 print('{} = Int("{}")'.format(v, v)) 60 print('s = Solver()') 61 for c in constraints[:-1]: 62 print('s.add({})'.format(c)) 63 expected = constraints[-1].strip() 64 print('assert(s.check() == {})'.format(expected)) 65 print('print("all checks passed")') 66 67 68if __name__ == '__main__': 69 main() 70