def arg_locs(self, is_fp=None, sizes=None):
        """
        Pass this a list of whether each parameter is floating-point or not, and get back a list of
        SimFunctionArguments. Optionally, pass a list of argument sizes (in bytes) as well.

        If you've customized this CC, this will sanity-check the provided locations with the given list.
        """
        session = self.arg_session
        if self.func_ty is None:
            # No function prototype is provided. `is_fp` must be provided.
            if is_fp is None:
                raise ValueError('"is_fp" must be provided when no function prototype is available.')
        else:
            # let's rely on the func_ty for the number of arguments and whether each argument is FP or not
            is_fp = [ True if isinstance(arg, (SimTypeFloat, SimTypeDouble)) else False for arg in self.func_ty.args ]

        if sizes is None: sizes = [self.arch.bytes] * len(is_fp)
        return [session.next_arg(ifp, size=sz) for ifp, sz in zip(is_fp, sizes)]