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85b82f10b7
This patch recommits "[ConstraintSystem] Add helpers to deal with linear constraints." (it reverts the revert commit 8da6ae4ce1b686c5c13698e4c5ee937811fda6f7). The reason for the revert was using __builtin_multiply_overflow, which is not available for all compilers. The patch has been updated to use MulOverflow from MathExtras.h
70 lines
1.7 KiB
Python
Executable File
70 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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Helper script to convert the log generated by '-debug-only=constraint-system'
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to a Python script that uses Z3 to verify the decisions using Z3's Python API.
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Example usage:
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> cat path/to/file.log
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---
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x6 + -1 * x7 <= -1
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x6 + -1 * x7 <= -2
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sat
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> ./convert-constraint-log-to-z3.py path/to/file.log > check.py && python ./check.py
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> cat check.py
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from z3 import *
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x3 = Int("x3")
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x1 = Int("x1")
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x2 = Int("x2")
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s = Solver()
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s.add(x1 + -1 * x2 <= 0)
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s.add(x2 + -1 * x3 <= 0)
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s.add(-1 * x1 + x3 <= -1)
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assert(s.check() == unsat)
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print('all checks passed')
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"""
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import argparse
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import re
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def main():
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parser = argparse.ArgumentParser(
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description='Convert constraint log to script to verify using Z3.')
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parser.add_argument('log_file', metavar='log', type=str,
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help='constraint-system log file')
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args = parser.parse_args()
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content = ''
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with open(args.log_file, 'rt') as f:
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content = f.read()
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groups = content.split('---')
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var_re = re.compile('x\d+')
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print('from z3 import *')
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for group in groups:
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constraints = [g.strip() for g in group.split('\n') if g.strip() != '']
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variables = set()
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for c in constraints[:-1]:
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for m in var_re.finditer(c):
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variables.add(m.group())
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if len(variables) == 0:
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continue
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for v in variables:
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print('{} = Int("{}")'.format(v, v))
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print('s = Solver()')
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for c in constraints[:-1]:
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print('s.add({})'.format(c))
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expected = constraints[-1].strip()
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print('assert(s.check() == {})'.format(expected))
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print('print("all checks passed")')
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if __name__ == '__main__':
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main()
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