111 lines
3.0 KiB
Ruby
111 lines
3.0 KiB
Ruby
# From a programmers perspective an object has hash like data (with instance variables as keys)
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# and functions to work on that data.
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# Only the object may access it's data directly.
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# From an implementation perspective it is a chunk of memory with a type as the first
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# word (instance of class Type).
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# Objects are arranged or layed out (in memory) according to their Type
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# every object has a Type. Type objects are immutable and may be reused for a group/class
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# of objects.
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# The Type of an object may change, but then a new Type is created
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# The Type also defines the class of the object
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# The Type is **always** the first entry (index 0) in an object
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module Parfait
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TYPE_INDEX = 0
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class Object
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attr :type
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def self.memory_size
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8
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end
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def self.type_length
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1
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end
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def self.new( *args )
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object = self.allocate
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# have to grab the class, because we are in the ruby class not the parfait one
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cl = Parfait.object_space.get_class_by_name( self.name.split("::").last.to_sym)
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# and have to set the type before we let the object do anything. otherwise boom
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object.set_type cl.instance_type
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object.send :initialize , *args
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object
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end
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def == other
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self.object_id == other.object_id
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end
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# This is the core of the object system.
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# The class of an object is stored in the objects memory
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#
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# In RubyX we store the class in the Type, and so the Type is the only fixed
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# data that every object carries.
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def get_class()
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l = get_type()
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#puts "Type #{l.class} in #{self.class} , #{self}"
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l.object_class()
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end
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# private
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def set_type(typ)
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raise "not type #{typ.class} in #{object_id.to_s(16)}" unless typ.is_a?(Type)
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self.type = typ
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end
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# so we can keep the raise in get_type
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def has_type?
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! type.nil?
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end
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def get_type()
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raise "No type #{self.object_id.to_s(16)}:#{self.class} " unless has_type?
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type
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end
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def get_instance_variables
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type.names
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end
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def get_instance_variable( name )
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index = instance_variable_defined(name)
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#puts "getting #{name} at #{index}"
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return nil if index == nil
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return get_internal_word(index)
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end
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def set_instance_variable( name , value )
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index = instance_variable_defined(name)
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return nil if index == nil
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return set_internal_word(index , value)
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end
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def instance_variable_defined( name )
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type.variable_index(name)
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end
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def padded_length
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Padding.padded_words( type.instance_length )
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end
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# parfait versions are deliberately called different, so we "relay"
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# have to put the "" on the names for rfx to take them off again
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def instance_variables
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get_instance_variables.to_a.collect{ |n| "#{n}".to_sym }
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end
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# name comes in as a ruby var name
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def instance_variable_ged name
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var = get_instance_variable name.to_s[1 .. -1].to_sym
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#puts "getting #{name} #{var}"
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var
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end
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end
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end
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