'Get function name from the labels of the very first block.
:return: Function name if there is any, None otherwise
:rtype: string'

@property
def name(self):

    if (self._name is not None):
        return self._name
    if (not self.blocks):
        return None
    if (not self.blocks[0].instructions):
        return None
    if (not self.blocks[0].instructions[0].labels):
        return None
    lbl = self.blocks[0].instructions[0].labels[0]
    if isinstance(lbl, FunctionLabel):
        return lbl.function_name
    return None
