[MacRuby-devel] [MacRuby] #307: eval destroys a singleton attribute (Segmentation fault)

8 Aug 2009

      #307: eval destroys a singleton attribute (Segmentation fault)
------------------------+---------------------------------------------------
 Reporter:  dev@…       |       Owner:  lsansonetti@…        
     Type:  defect      |      Status:  new                  
 Priority:  major       |   Milestone:  MacRuby 0.5          
Component:  MacRuby     |    Keywords:  eval                 
------------------------+---------------------------------------------------
 hotconsole crashes after entering at least one expression and calling the
 'clear'-command from menu

 so I tried to narrow the problem to:

 {{{
 require 'hotcocoa'
 include HotCocoa

 class Test

   def initialize
     @win = window( :title => "HotConsole") do |win|
 #      win.will_close { exit }
     end
     class << @win
       attr_accessor :target
     end
     @win.target = self
    end

   def run
     $stderr.puts @win.target.inspect
 # the eval in the next line destroys the @win.target. Disable it and
 everything works fine!
     $stderr.puts eval("42", TOPLEVEL_BINDING.dup, 'hotconsole', 100)
 # the next line crashes with: unknown: [BUG] Segmentation fault
     $stderr.puts @win.target.inspect
     $stderr.puts "everything is fine!"
     exit
   end

 end

 class Application
   def start
     application :name => "HotConsole" do |app|
       app.delegate = self
       Test.new.run
     end
   end
 end

 Application.new.start
 }}}

 gives the result:

 {{{
 #-<Test:0x8004450a0>
 42
 unknown: [BUG] Segmentation fault
 MacRuby version 0.5 (ruby 1.9.0) [universal-darwin9.0, x86_64]

 Abort trap
 }}}

 Unfortunately enabling the "win.will_close..." causes the Segmentation
 fault to disappear on my system, so I hope other people will see the same
 behaviour! (obvisously this is memory layout dependant)

 BTW, I didn´t use NSLog because it crashes on my system:

 {{{
 macruby -e "framework 'Cocoa'; NSLog 'test'"
 }}}

 gives:

 {{{
 unknown: [BUG] Segmentation fault
 MacRuby version 0.5 (ruby 1.9.0) [universal-darwin9.0, x86_64]

 Abort trap
 }}}

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/307>
MacRuby <http://macruby.org/>