More state_machine gem memory profiling...

anonymous-class-memory-profiling-sm.rb

class HM < Module ; end

class Machine
  def initialize(owner_class)
    @helpers = helpers = {
      :instance => HM.new,
      :class => HM.new
    }

    owner_class.class_eval do
      extend helpers[:class]
      include helpers[:instance]
    end

    @helpers[:instance].class_eval do
      # Comment out this define_method block, and
      # garbage collection works as expected
      define_method('test_dynamic_method') do
        puts 'test'
      end
    end
  end
end

c = Class.new do
  @machine = Machine.new(self)
end
cid = c.object_id

c = nil

GC.start
GC.start # Have to do it twice

begin
  puts "Anonymous class still exists. #{ObjectSpace._id2ref(cid)}"
rescue
  puts "Anonymous class has been garbage collected"
end