# File lib/rcov.rb, line 889
  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