Beispiel #1
0
    def _back_single_term(self, expr, args):
        assert z3.is_expr(expr)

        if z3.is_quantifier(expr):
            raise NotImplementedError(
                "Quantified back conversion is currently not supported")

        res = None
        if z3.is_and(expr):
            res = self.mgr.And(args)
        elif z3.is_or(expr):
            res = self.mgr.Or(args)
        elif z3.is_add(expr):
            res = self.mgr.Plus(args)
        elif z3.is_div(expr):
            res = self.mgr.Div(args[0], args[1])
        elif z3.is_eq(expr):
            if self._get_type(args[0]).is_bool_type():
                res = self.mgr.Iff(args[0], args[1])
            else:
                res = self.mgr.Equals(args[0], args[1])
        elif z3.is_iff(expr):
            res = self.mgr.Iff(args[0], args[1])
        elif z3.is_xor(expr):
            res = self.mgr.Xor(args[0], args[1])
        elif z3.is_false(expr):
            res = self.mgr.FALSE()
        elif z3.is_true(expr):
            res = self.mgr.TRUE()
        elif z3.is_gt(expr):
            res = self.mgr.GT(args[0], args[1])
        elif z3.is_ge(expr):
            res = self.mgr.GE(args[0], args[1])
        elif z3.is_lt(expr):
            res = self.mgr.LT(args[0], args[1])
        elif z3.is_le(expr):
            res = self.mgr.LE(args[0], args[1])
        elif z3.is_mul(expr):
            res = self.mgr.Times(args[0], args[1])
        elif z3.is_uminus(expr):
            tp = self._get_type(args[0])
            if tp.is_real_type():
                minus_one = self.mgr.Real(-1)
            else:
                assert tp.is_int_type()
                minus_one = self.mgr.Int(-1)
            res = self.mgr.Times(args[0], minus_one)
        elif z3.is_sub(expr):
            res = self.mgr.Minus(args[0], args[1])
        elif z3.is_not(expr):
            res = self.mgr.Not(args[0])
        elif z3.is_implies(expr):
            res = self.mgr.Implies(args[0], args[1])
        elif z3.is_quantifier(expr):
            raise NotImplementedError
        elif z3.is_const(expr):
            if z3.is_rational_value(expr):
                n = expr.numerator_as_long()
                d = expr.denominator_as_long()
                f = Fraction(n, d)
                res = self.mgr.Real(f)
            elif z3.is_int_value(expr):
                n = expr.as_long()
                res = self.mgr.Int(n)
            elif z3.is_bv_value(expr):
                n = expr.as_long()
                w = expr.size()
                res = self.mgr.BV(n, w)
            else:
                # it must be a symbol
                res = self.mgr.get_symbol(str(expr))
        elif z3.is_ite(expr):
            res = self.mgr.Ite(args[0], args[1], args[2])
        elif z3.is_function(expr):
            res = self.mgr.Function(self.mgr.get_symbol(expr.decl().name()), args)
        elif z3.is_to_real(expr):
            res = self.mgr.ToReal(args[0])
        elif z3.is_bv_and(expr):
            res = self.mgr.BVAnd(args[0], args[1])
        elif z3.is_bv_or(expr):
            res = self.mgr.BVOr(args[0], args[1])
        elif z3.is_bv_xor(expr):
            res = self.mgr.BVXor(args[0], args[1])
        elif z3.is_bv_not(expr):
            res = self.mgr.BVNot(args[0])
        elif z3.is_bv_neg(expr):
            res = self.mgr.BVNeg(args[0])
        elif z3.is_bv_concat(expr):
            res = self.mgr.BVConcat(args[0], args[1])
        elif z3.is_bv_ult(expr):
            res = self.mgr.BVULT(args[0], args[1])
        elif z3.is_bv_uleq(expr):
            res = self.mgr.BVULE(args[0], args[1])
        elif z3.is_bv_slt(expr):
            res = self.mgr.BVSLT(args[0], args[1])
        elif z3.is_bv_sleq(expr):
            res = self.mgr.BVSLE(args[0], args[1])
        elif z3.is_bv_ugt(expr):
            res = self.mgr.BVUGT(args[0], args[1])
        elif z3.is_bv_ugeq(expr):
            res = self.mgr.BVUGE(args[0], args[1])
        elif z3.is_bv_sgt(expr):
            res = self.mgr.BVSGT(args[0], args[1])
        elif z3.is_bv_sgeq(expr):
            res = self.mgr.BVSGE(args[0], args[1])
        elif z3.is_bv_extract(expr):
            end = z3.get_payload(expr, 0)
            start = z3.get_payload(expr, 1)
            res = self.mgr.BVExtract(args[0], start, end)
        elif z3.is_bv_add(expr):
            res = self.mgr.BVAdd(args[0], args[1])
        elif z3.is_bv_mul(expr):
            res = self.mgr.BVMul(args[0], args[1])
        elif z3.is_bv_udiv(expr):
            res = self.mgr.BVUDiv(args[0], args[1])
        elif z3.is_bv_sdiv(expr):
            res = self.mgr.BVSDiv(args[0], args[1])
        elif z3.is_bv_urem(expr):
            res = self.mgr.BVURem(args[0], args[1])
        elif z3.is_bv_srem(expr):
            res = self.mgr.BVSRem(args[0], args[1])
        elif z3.is_bv_lshl(expr):
            res = self.mgr.BVLShl(args[0], args[1])
        elif z3.is_bv_lshr(expr):
            res = self.mgr.BVLShr(args[0], args[1])
        elif z3.is_bv_ashr(expr):
            res = self.mgr.BVAShr(args[0], args[1])
        elif z3.is_bv_sub(expr):
            res = self.mgr.BVSub(args[0], args[1])
        elif z3.is_bv_rol(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVRol(args[0], amount)
        elif z3.is_bv_ror(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVRor(args[0], amount)
        elif z3.is_bv_ext_rol(expr):
            amount = args[1].bv_unsigned_value()
            res = self.mgr.BVRol(args[0], amount)
        elif z3.is_bv_ext_ror(expr):
            amount = args[1].bv_unsigned_value()
            res = self.mgr.BVRor(args[0], amount)
        elif z3.is_bv_sext(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVSExt(args[0], amount)
        elif z3.is_bv_zext(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVZExt(args[0], amount)

        if res is None:
            raise ConvertExpressionError(message=("Unsupported expression: %s" %
                                                   str(expr)),
                                         expression=expr)
        return res
Beispiel #2
0
    def _back_single_term(self, expr, args, model=None):
        assert z3.is_expr(expr)

        if z3.is_quantifier(expr):
            raise NotImplementedError(
                "Quantified back conversion is currently not supported")

        res = None
        if z3.is_and(expr):
            res = self.mgr.And(args)
        elif z3.is_or(expr):
            res = self.mgr.Or(args)
        elif z3.is_add(expr):
            res = self.mgr.Plus(args)
        elif z3.is_div(expr):
            res = self.mgr.Div(args[0], args[1])
        elif z3.is_eq(expr):
            if self._get_type(args[0]).is_bool_type():
                res = self.mgr.Iff(args[0], args[1])
            else:
                res = self.mgr.Equals(args[0], args[1])
        elif z3.is_iff(expr):
            res = self.mgr.Iff(args[0], args[1])
        elif z3.is_xor(expr):
            res = self.mgr.Xor(args[0], args[1])
        elif z3.is_false(expr):
            res = self.mgr.FALSE()
        elif z3.is_true(expr):
            res = self.mgr.TRUE()
        elif z3.is_gt(expr):
            res = self.mgr.GT(args[0], args[1])
        elif z3.is_ge(expr):
            res = self.mgr.GE(args[0], args[1])
        elif z3.is_lt(expr):
            res = self.mgr.LT(args[0], args[1])
        elif z3.is_le(expr):
            res = self.mgr.LE(args[0], args[1])
        elif z3.is_mul(expr):
            res = self.mgr.Times(args[0], args[1])
        elif z3.is_uminus(expr):
            tp = self._get_type(args[0])
            if tp.is_real_type():
                minus_one = self.mgr.Real(-1)
            else:
                assert tp.is_int_type()
                minus_one = self.mgr.Int(-1)
            res = self.mgr.Times(args[0], minus_one)
        elif z3.is_sub(expr):
            res = self.mgr.Minus(args[0], args[1])
        elif z3.is_not(expr):
            res = self.mgr.Not(args[0])
        elif z3.is_implies(expr):
            res = self.mgr.Implies(args[0], args[1])
        elif z3.is_quantifier(expr):
            raise NotImplementedError
        elif z3.is_const(expr):
            if z3.is_rational_value(expr):
                n = expr.numerator_as_long()
                d = expr.denominator_as_long()
                f = Fraction(n, d)
                res = self.mgr.Real(f)
            elif z3.is_int_value(expr):
                n = expr.as_long()
                res = self.mgr.Int(n)
            elif z3.is_bv_value(expr):
                n = expr.as_long()
                w = expr.size()
                res = self.mgr.BV(n, w)
            elif z3.is_as_array(expr):
                if model is None:
                    raise NotImplementedError("As-array expressions cannot be" \
                                              " handled as they are not " \
                                              "self-contained")
                else:
                    interp_decl = z3.get_as_array_func(expr)
                    interp = model[interp_decl]
                    default = self.back(interp.else_value(), model=model)
                    assign = {}
                    for i in xrange(interp.num_entries()):
                        e = interp.entry(i)
                        assert e.num_args() == 1
                        idx = self.back(e.arg_value(0), model=model)
                        val = self.back(e.value(), model=model)
                        assign[idx] = val
                    arr_type = self._z3_to_type(expr.sort())
                    res = self.mgr.Array(arr_type.index_type, default, assign)
            elif z3.is_algebraic_value(expr):
                # Algebraic value
                return self.mgr._Algebraic(Numeral(expr))
            else:
                # it must be a symbol
                res = self.mgr.get_symbol(str(expr))
        elif z3.is_ite(expr):
            res = self.mgr.Ite(args[0], args[1], args[2])
        elif z3.is_function(expr):
            res = self.mgr.Function(self.mgr.get_symbol(expr.decl().name()), args)
        elif z3.is_to_real(expr):
            res = self.mgr.ToReal(args[0])
        elif z3.is_bv_and(expr):
            res = self.mgr.BVAnd(args[0], args[1])
        elif z3.is_bv_or(expr):
            res = self.mgr.BVOr(args[0], args[1])
        elif z3.is_bv_xor(expr):
            res = self.mgr.BVXor(args[0], args[1])
        elif z3.is_bv_not(expr):
            res = self.mgr.BVNot(args[0])
        elif z3.is_bv_neg(expr):
            res = self.mgr.BVNeg(args[0])
        elif z3.is_bv_concat(expr):
            res = self.mgr.BVConcat(args[0], args[1])
        elif z3.is_bv_ult(expr):
            res = self.mgr.BVULT(args[0], args[1])
        elif z3.is_bv_uleq(expr):
            res = self.mgr.BVULE(args[0], args[1])
        elif z3.is_bv_slt(expr):
            res = self.mgr.BVSLT(args[0], args[1])
        elif z3.is_bv_sleq(expr):
            res = self.mgr.BVSLE(args[0], args[1])
        elif z3.is_bv_ugt(expr):
            res = self.mgr.BVUGT(args[0], args[1])
        elif z3.is_bv_ugeq(expr):
            res = self.mgr.BVUGE(args[0], args[1])
        elif z3.is_bv_sgt(expr):
            res = self.mgr.BVSGT(args[0], args[1])
        elif z3.is_bv_sgeq(expr):
            res = self.mgr.BVSGE(args[0], args[1])
        elif z3.is_bv_extract(expr):
            end = z3.get_payload(expr, 0)
            start = z3.get_payload(expr, 1)
            res = self.mgr.BVExtract(args[0], start, end)
        elif z3.is_bv_add(expr):
            res = self.mgr.BVAdd(args[0], args[1])
        elif z3.is_bv_mul(expr):
            res = self.mgr.BVMul(args[0], args[1])
        elif z3.is_bv_udiv(expr):
            res = self.mgr.BVUDiv(args[0], args[1])
        elif z3.is_bv_sdiv(expr):
            res = self.mgr.BVSDiv(args[0], args[1])
        elif z3.is_bv_urem(expr):
            res = self.mgr.BVURem(args[0], args[1])
        elif z3.is_bv_srem(expr):
            res = self.mgr.BVSRem(args[0], args[1])
        elif z3.is_bv_lshl(expr):
            res = self.mgr.BVLShl(args[0], args[1])
        elif z3.is_bv_lshr(expr):
            res = self.mgr.BVLShr(args[0], args[1])
        elif z3.is_bv_ashr(expr):
            res = self.mgr.BVAShr(args[0], args[1])
        elif z3.is_bv_sub(expr):
            res = self.mgr.BVSub(args[0], args[1])
        elif z3.is_bv_rol(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVRol(args[0], amount)
        elif z3.is_bv_ror(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVRor(args[0], amount)
        elif z3.is_bv_ext_rol(expr):
            amount = args[1].bv_unsigned_value()
            res = self.mgr.BVRol(args[0], amount)
        elif z3.is_bv_ext_ror(expr):
            amount = args[1].bv_unsigned_value()
            res = self.mgr.BVRor(args[0], amount)
        elif z3.is_bv_sext(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVSExt(args[0], amount)
        elif z3.is_bv_zext(expr):
            amount = z3.get_payload(expr, 0)
            res = self.mgr.BVZExt(args[0], amount)
        elif z3.is_array_select(expr):
            res = self.mgr.Select(args[0], args[1])
        elif z3.is_array_store(expr):
            res = self.mgr.Store(args[0], args[1], args[2])
        elif z3.is_const_array(expr):
            arr_ty = self._z3_to_type(expr.sort())
            k = args[0]
            res = self.mgr.Array(arr_ty.index_type, k)
        elif z3.is_power(expr):
            res = self.mgr.Pow(args[0], args[1])
        if res is None:
            raise ConvertExpressionError(message=("Unsupported expression: %s" %
                                                   str(expr)),
                                         expression=expr)
        return res