'Generate a sif file from the call map.
:param filepath:    Path of the sif file
:return:            None'

def _genenare_callmap_sif(self, filepath):

    with open(filepath, 'wb') as f:
        for (src, dst) in self.callgraph.edges():
            f.write(('%#x DCTB DirectEdge DCTB %#x\n' % (src, dst)))
