Dependency listing tool (for .a/.o files)

objdepend

#!/usr/bin/env ruby
prefix = $0.split("/").last.sub(/[^-]+$/, "")
objs = {}
ARGV.each {|f|
  n = f
  %x[#{prefix}nm #{f}].split("\n").each {|line|
    next if line == ""
    next n = "#{f}(#$1)" if line =~ /^([^: ]+):$/
    objs[n] ||= {:imports => [], :exports => [], :depends => {}, :required => {}}
    if line =~ /^\s+U ([^ ]+)$/
      objs[n][:imports] << $1
    elsif line =~ /^[0-9a-f]+ [A-TV-Z] ([^ ]+)$/
      objs[n][:exports] << $1
    end
  }
}
objs.each {|n,o|
  o[:imports].each {|s|
    objs.select {|n2,o2| o2[:exports].include?(s) }.each_key {|n3|
      (o[:depends][n3] ||= []) << s
      (objs[n3][:required][n] ||= []) << s
    }
  }
  puts("#{n}:")
  [{:title => "Depends on", :arrow => "=>", :data => o[:depends]},
   {:title => "Required by", :arrow => "<=", :data => o[:required]}].each {|c|
    puts("  #{c[:title]}")
    puts("  (none)") if c[:data].empty?
    c[:data].each {|n2,s2|
      puts("  #{c[:arrow]} #{n2}")
      puts("     (#{s2[0...2].join(", ")}#{s2.size>2 ? ", ..." : ""})")
    }
  }
  puts
}
# vim: set et sts=2 sw=2: