symbols.rb

require 'graphviz'
require 'graphviz/theory'

g = GraphViz.new( :G, :type => :digraph, :layout => 'dot' )

binaries = {}
symbols = {}
nodes = {}

def list_symbols file, exported
  `nm #{file} | grep " #{exported ? 'T' : 'U'} "`.split("\n").map { |l| l[/[^\s]+$/] }
end

ARGV.each do |file|
  nodes[file] = g.add_nodes( File.basename(file) )
  
  binaries[file] = {}
  binaries[file][:exported] = list_symbols file, true
  binaries[file][:undefined] = list_symbols file, false

  binaries[file][:exported].each do |symbol|
    symbols[symbol] = file
  end
end


binaries.each do |file, dic|
  dic[:undefined].each do |sym|
    next unless symbols[sym]
    g.add_edges(nodes[file], nodes[symbols[sym]]) unless nodes[file].neighbors.any? { |e| e == nodes[symbols[sym]] }
  end
end

g.output( :png => "graph.png" )