""" simple non-constant constant. Ie constant which does not get annotated as constant
"""

from pypy.rpython.extregistry import ExtRegistryEntry
from pypy.annotation.bookkeeper import getbookkeeper
from pypy.objspace.flow.model import Variable, Constant
from pypy.rpython.lltypesystem import lltype

class NonConstant(object):
    def __init__(self, _constant):
        self.__dict__['constant'] = _constant

    def __getattr__(self, attr):
        return getattr(self.__dict__['constant'], attr)

    def __setattr__(self, attr, value):
        setattr(self.__dict__['constant'], attr, value)

    def __nonzero__(self):
        return bool(self.__dict__['constant'])

class EntryNonConstant(ExtRegistryEntry):
    _about_ = NonConstant
    
    def compute_result_annotation(self, arg):
        if hasattr(arg, 'const'):
            return self.bookkeeper.immutablevalue(arg.const, False)
        else:
            return arg

    def specialize_call(self, hop):
        hop.exception_cannot_occur()
        retval = Constant(hop.r_result.convert_const(hop.args_v[0].value))
        retval.concretetype = hop.r_result.lowleveltype
        return retval