def z3_bv_to_int(x):
"""BitVector to Integer Z3 conversion
Parameters
----------
x : z3.BitVecRef or z3.BitVecNumRef
BitVector variable to be converted to Int
Returns
-------
z3.ArithRef
z3.ArithRef is an expression that will convert the BitVec into Integer
inside Z3 rather than before insertion into the solver.
This function wraps Z3 C API functions to allow for a python interpretation
of BitVec to Int conversions. The returned object is an expression that Z3
will evaluate as an Int rather than BitVec during solving.
Example
-------
If you want to convert a BitVec into an Int::
In [1]: import z3
In [2]: from pySym import pyState.z3Helpers
In [3]: s = z3.Solver()
In [4]: x = z3.BitVec('x',32)
In [5]: y = z3.Int('y')
In [6]: x = pyState.z3Helpers.z3_bv_to_int(x)
In [7]: s.add(x == y)
In [8]: s
Out[8]: [BV2Int(x) == y]
In [9]: s.check()
Out[9]: sat
"""
return z3.ArithRef(z3.Z3_mk_bv2int(x.ctx_ref(), x.as_ast(), 0), x.ctx)
def walk_bv_tonatural(self, formula, args, **kwargs):
z3term = z3.Z3_mk_bv2int(self.ctx.ref(), args[0], False)
z3.Z3_inc_ref(self.ctx.ref(), z3term)
return z3term
