def unbox_unicode_str(typ, obj, c):
    """
    Convert a unicode str object to a native unicode structure.
    """
    ok, data, length, kind, is_ascii, hashv = \
        c.pyapi.string_as_string_size_and_kind(obj)
    uni_str = cgutils.create_struct_proxy(typ)(c.context, c.builder)
    uni_str.data = data
    uni_str.length = length
    uni_str.kind = kind
    uni_str.is_ascii = is_ascii
    uni_str.hash = hashv
    uni_str.meminfo = c.pyapi.nrt_meminfo_new_from_pyobject(
        data,  # the borrowed data pointer
        obj,   # the owner pyobject; the call will incref it.
    )
    uni_str.parent = obj

    is_error = cgutils.is_not_null(c.builder, c.pyapi.err_occurred())
    return NativeValue(uni_str._getvalue(), is_error=is_error)

    Convert a unicode str object to a native unicode structure.
    
numba/cpython/unicode.py