'Generate a sif file from the call map'

def genenare_callmap_sif(self, filepath):

    graph = self.call_map
    if (graph is None):
        raise AngrGirlScoutError('Please    generate    the    call    graph    first.')
    f = open(filepath, 'wb')
    for (src, dst) in graph.edges():
        f.write(('0x%x DCTB DirectEdge DCTB 0x%x\n' % (src, dst)))
    f.close()
