# File lib/sigdump.rb, line 60
  def self.dump_object_count(io)
    if defined?(ObjectSpace.count_objects)
      # ObjectSpace doesn't work in JRuby

      io.write "  Built-in objects:\n"
      ObjectSpace.count_objects.sort_by {|k,v| -v }.each {|k,v|
        io.write "%10s: %s\n" % [_fn(v), k]
      }

      string_size = 0
      array_size = 0
      hash_size = 0
      cmap = {}
      ObjectSpace.each_object {|o|
        c = o.class
        cmap[c] = (cmap[c] || 0) + 1
        if c == String
          string_size += o.bytesize
        elsif c == Array
          array_size = o.size
        elsif c == Hash
          hash_size = o.size
        end
      }

      io.write "  All objects:\n"
      cmap.sort_by {|k,v| -v }.each {|k,v|
        io.write "%10s: %s\n" % [_fn(v), k]
      }

      io.write "  String #{_fn(string_size)} bytes\n"
      io.write "   Array #{_fn(array_size)} elements\n"
      io.write "    Hash #{_fn(hash_size)} pairs\n"

      io.flush
    end
    nil
  end