z4-solver 2022.12.18.0

z3++

z4

z3 with some improvements:

• Change the right shift operation on BitVec's to be logical instead of arithmetic
• Extend the * operation on BoolRef's to work between two BoolRef's.
• Add additional operations to BoolRef's:
  • +, returning an Int kind such that e.g True+True+False==2
  • &, utilizing And()
  • |, utilizing Or()
  • ~, utilizing Not()
• Add the ByteVec class
• Some helper methods for solving:
  • easy_solve
  • find_all_solutions
  • easy_prove
• Add some helper functions for z3 variables/constants:
  • BoolToInt
  • Sgn
  • Abs
  • TruncDiv

Usage

Install with pip install z4-solver.

Standard usage:

import z4

a, b = z4.Ints("a b")
print(*z4.find_all_solutions([a > 0, b > 0, a % b == 3, a > b, a + b == 19]), sep="\n")

Output:

[b = 4, a = 15, div0 = [else -> 3], mod0 = [else -> 3]]
[b = 8, a = 11, div0 = [else -> 1], mod0 = [else -> 3]]