Ruby object model: A matter of life and death
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Ruby object model internals for MRI. These slides have some animations, so if you want to see them all, you should download it. Created with libreoffice impress
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Ruby object model: A matter of life and death
- 2. Javier Lafora Working at ASPgems @eLafo elafosobrerailes.blogspot.com
- 3. In ruby everything is an object
- 9. RBasic RClass RObject MyClass flags klass object instance_variables super flags klass constants instance_variables methods
- 13. BasicObject *super *klass Object Module *super *super *klass *klass Musician *super *klass name=() name() Class *super *klass bruce IronMaiden *klass *super @name=”bruce” *klass
- 14. Every instance of RClass will be an instance of Class even Class itself
- 15. Unshamesly taken from Burkey Libbey's presentation “Ruby's Object Model: Metaprogramming and other Magic”
- 16. BasicObject *super *klass Object *super *klass Musician *super *klass name=() name() bruce IronMaiden *klass *super @name=”bruce” *klass
- 17. BasicObject *super *klass Object *super *klass to_s() Musician *super *klass bruce IronMaiden *klass *super @name=”bruce” *klass
- 26. bruce IronMaiden *klass *super #bruce *klass *klass *super flight_plane()
- 30. Class Methods
- 32. Musician Class *super *super *klass *klass #Musician *super *klass awesome_musicians()
- 33. FAIL
- 34. Object *super Module Class *klass *super *klass #Musician *super Musician *klass *super awesome_musicians() *klass IronMaiden Class *super *super *klass *klass
- 38. BasicObject #BasicObject *super *super *klass *klass Object #Object *super *super *klass *klass Class *super Musician #Musician *klass *super *super *klass *klass IronMaiden #IronMaiden *super *super *klass *klass
- 39. “The superclass of the eigenclass of an object is the object's class. The superclass of the eigenclass of a class is the eigenclass of the class's superclass.” Paolo Perrotta
- 43. IronMaiden *super *klass ICSinger *super *klass high_pitch_from_hell() #bruce *klass bruce *super *klass
- 46. Musician *super *klass ICHeavyMetal *super *klass IronMaiden devil_horns() *super *klass #bruce *klass *super ICSinger *super bruce *klass *klass high_pitch_from_hell()
- 50. ICHeavyMetal HeavyMetal *super *klass *klass *iv_tbl *iv_tbl *m_tbl *m_tbl iv_tbl m_tbl devil_horns()
- 54. Object #Object *super *super *klass *klass m_tbl m_tbl Musician #Musician *super *super *klass *klass m_tbl m_tbl ICHeavyMetal HeavyMetal #HeavyMetal *super *super *super *klass *klass *klass *m_tbl *m_tbl *m_tbl IronMaiden #IronMaiden *super *super *klass *klass *m_tbl *m_tbl
- 56. Object #Object Musician #Musician ICHeavyMetal HeavyMetal ICHeavyMetal:: HeavyMetal:: InstanceMethods InstanceMethods HeavyMetal:: ClassMethods ICHeavyMetal:: IronMaiden ClassMethods #IronMaiden
- 67. Metaprogramming with Ruby – Paolo Perrotta http://mwrc2008.confreaks.com/11farley.html http://www.rubyinside.com/a-look-into-rubys-object-model-3940.html http://rhg.rubyforge.org/ http://www.madebydna.com/all/code/2011/06/24/eigenclasses-demystified.html http://www.ruby-doc.org/docs/ProgrammingRuby/html/ext_ruby.html http://www.atalon.cz/rb-om/ruby-object-model/#sc-inheritance-sample
- 68. Thank you
Editor's Notes
- Ruby C's VALUE type is interpreted as an integer, if it's (Fixnum, Symbol, true, false or nil), or a pointer, if it's a large value klass is always a large value
- struct st_table is mostly a ruby hash
- #define META_CLASS_OF_CLASS_CLASS_P(k) (METACLASS_OF(k) == (k)) #define METACLASS_OF(k) RBASIC(k)->klass