From: ara.t.howard@...
Date: 2006-10-27T05:14:46+09:00
Subject: Re: debugging memory use and GC

On Fri, 27 Oct 2006, Rick DeNatale wrote:

> Not sure, what I was suggesting was that the real goal is to somehow root
> out the reference path or path which is keeping an object from being
> reclaimed without making additional references.
<snip>

right.  i was thinking of something like this:

     harp:~ > cat a.rb
     def really_stupid_reference_finder obj
       begin
         class << obj
           def _dump(*_) throw 'referer', true end
         end
       rescue TypeError
         nil
       end
       ObjectSpace.each_object do |candidate|
         next if candidate == obj
         referer = catch 'referer' do
           begin
             Marshal.dump candidate
           rescue TypeError
             false
           end
           false
         end
         return candidate if referer
       end
       return nil
     ensure
       GC.start
     end



     a = [b = '42']

     referer = really_stupid_reference_finder b
     p referer
     p referer == a

     referer = really_stupid_reference_finder [ 'new_array' ]
     p referer
     p referer == a



     harp:~ > ruby a.rb
     ["42"]
     true
     nil
     false


-a
-- 
my religion is very simple.  my religion is kindness. -- the dalai lama