def lower_global(self, name, value):
        """
        1) Check global scope dictionary.
        2) Check __builtins__.
            2a) is it a dictionary (for non __main__ module)
            2b) is it a module (for __main__ module)
        """
        moddict = self.get_module_dict()
        obj = self.pyapi.dict_getitem(moddict, self._freeze_string(name))
        self.incref(obj)  # obj is borrowed

        try:
            if value in _unsupported_builtins:
                raise ForbiddenConstruct("builtins %s() is not supported"
                                         % name, loc=self.loc)
        except TypeError:
            # `value` is unhashable, ignore
            pass

        if hasattr(builtins, name):
            obj_is_null = self.is_null(obj)
            bbelse = self.builder.basic_block

            with self.builder.if_then(obj_is_null):
                mod = self.pyapi.dict_getitem(moddict,
                                          self._freeze_string("__builtins__"))
                builtin = self.builtin_lookup(mod, name)
                bbif = self.builder.basic_block

            retval = self.builder.phi(self.pyapi.pyobj)
            retval.add_incoming(obj, bbelse)
            retval.add_incoming(builtin, bbif)

        else:
            retval = obj
            with cgutils.if_unlikely(self.builder, self.is_null(retval)):
                self.pyapi.raise_missing_global_error(name)
                self.return_exception_raised()

        return retval

        1) Check global scope dictionary.
        2) Check __builtins__.
            2a) is it a dictionary (for non __main__ module)
            2b) is it a module (for __main__ module)
        
numba/core/pylowering.py