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

Technology Entertainment & Humor

Javier Lafora
Working at ASPgems
@eLafo
elafosobrerailes.blogspot.com

MyClass

flags
klass
super
instance_variables
constants
methods

RBasic
RClass

RObject
MyClass

flags
klass
object instance_variables
super
flags
klass
constants
instance_variables methods

BasicObject
*super
*klass

Object Module
*super *super
*klass *klass

Musician
*super
*klass
name=()
name()
Class
*super
*klass

bruce
IronMaiden
*klass *super
@name=”bruce” *klass

Every instance of RClass will be an instance of Class

even Class itself

Unshamesly taken from Burkey Libbey's presentation
“Ruby's Object Model: Metaprogramming and other Magic”

BasicObject
*super
*klass

Object
*super
*klass

Musician
*super
*klass
name=()
name()

bruce
IronMaiden
*klass *super
@name=”bruce” *klass

BasicObject
*super
*klass

Object
*super
*klass
to_s()

Musician
*super
*klass

bruce
IronMaiden
*klass *super
@name=”bruce” *klass

bruce
IronMaiden
*klass
*super
#bruce *klass

*klass
*super
flight_plane()

Musician Class
*super *super
*klass *klass

#Musician
*super
*klass
awesome_musicians()

Object
*super Module
Class
*klass *super
*klass

#Musician
*super
Musician *klass
*super awesome_musicians()

*klass

IronMaiden Class
*super *super

*klass *klass

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

“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

IronMaiden
*super
*klass

ICSinger
*super
*klass
high_pitch_from_hell()

#bruce
*klass
bruce *super
*klass

Musician
*super
*klass

ICHeavyMetal
*super
*klass
IronMaiden devil_horns()

*super
*klass

#bruce
*klass
*super

ICSinger
*super
bruce *klass
*klass high_pitch_from_hell()

ICHeavyMetal HeavyMetal
*super *klass
*klass *iv_tbl

*iv_tbl *m_tbl

*m_tbl
iv_tbl

m_tbl
devil_horns()

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

Object #Object

Musician #Musician

ICHeavyMetal HeavyMetal

ICHeavyMetal:: HeavyMetal::
InstanceMethods InstanceMethods

HeavyMetal::
ClassMethods

ICHeavyMetal::
IronMaiden ClassMethods
#IronMaiden

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

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