class StackProf::Report

def print_callgrind(f = STDOUT)
  f.puts "version: 1"
  f.puts "creator: stackprof"
  f.puts "pid: 0"
  f.puts "cmd: ruby"
  f.puts "part: 1"
  f.puts "desc: mode: #{modeline}"
  f.puts "desc: missed: #{@data[:missed_samples]})"
  f.puts "positions: line"
  f.puts "events: Instructions"
  f.puts "summary: #{@data[:samples]}"
  list = frames
  list.each do |addr, frame|
    f.puts "fl=#{frame[:file]}"
    f.puts "fn=#{frame[:name]}"
    frame[:lines].each do |line, weight|
      f.puts "#{line} #{weight.is_a?(Array) ? weight[1] : weight}"
    end if frame[:lines]
    frame[:edges].each do |edge, weight|
      oframe = list[edge]
      f.puts "cfl=#{oframe[:file]}" unless oframe[:file] == frame[:file]
      f.puts "cfn=#{oframe[:name]}"
      f.puts "calls=#{weight} #{frame[:line] || 0}\n#{oframe[:line] || 0} #{weight}"
    end if frame[:edges]
    f.puts
  end
  f.puts "totals: #{@data[:samples]}"
end