# File lib/rcov/call_site_analyzer.rb, line 130
    def callsites(classname_or_fullname, methodname = nil)
      rawsites = raw_data_relative.first[expand_name(classname_or_fullname, methodname)]
      return nil unless rawsites
      ret = {}
      # could be a job for inject but it's slow and I don't mind the extra loc
      rawsites.each_pair do |backtrace, count|
        ret[CallSite.new(backtrace)] = count
      end
      ret
    end