rubyx/lib/register/parfait/space.rb

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# A Space is a collection of pages. It stores objects, the data for the objects,
# not references. See Page for more detail.
# Pages are stored by the object size they represent in a hash.
# Space and Page work together in making *new* objects available.
# "New" is slightly misleading in that normal operation only ever
# recycles objects.
module Parfait
# The Space contains all objects for a program. In functional terms it is a program, but in oo
# it is a collection of objects, some of which are data, some classes, some functions
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# The main entry is a function called (of all things) "main".
# This _must be supplied by the compled code (similar to c)
# There is a start and exit block that call main, which receives an List of strings
# While data ususally would live in a .data section, we may also "inline" it into the code
# in an oo system all data is represented as objects
class Space < Object
def initialize
raise "Space can not be instantiated by new, you'd need a space to do so. Chicken and egg"
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end
attributes [:classes , :first_message]
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# need a two phase init for the object space (and generally parfait) because the space
# is an interconnected graph, so not everthing is ready
def late_init
message = Message.new(nil)
50.times do
self.first_message = Message.new message
#puts "INIT caller #{message.object_id} to #{self.first_message.object_id}"
message.set_caller self.first_message
message = self.first_message
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end
end
# Make the object space globally available
def self.object_space
@@object_space
end
# TODO Must get rid of the setter
def self.set_object_space space
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@@object_space = space
end
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def get_main
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kernel = get_class_by_name :Space
kernel.get_instance_method :main
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end
def get_init
kernel = get_class_by_name :Kernel
kernel.get_instance_method :__init__
end
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# get a class by name (symbol)
# return nili if no such class. Use bang version if create should be implicit
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def get_class_by_name name
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raise "get_class_by_name #{name}.#{name.class}" unless name.is_a?(Symbol)
c = self.classes[name]
#puts "MISS, no class #{name} #{name.class}" unless c # " #{self.classes}"
#puts "CLAZZ, #{name} #{c.get_type.get_length}" if c
c
end
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# get or create the class by the (symbol) name
# notice that this method of creating classes implies Object superclass
def get_class_by_name! name
c = get_class_by_name(name)
return c if c
create_class name , get_class_by_name(:Object)
end
# this is the way to instantiate classes (not Parfait::Class.new)
# so we get and keep exactly one per name
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def create_class name , superclass
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raise "create_class #{name.class}" unless name.is_a? Symbol
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c = Class.new(name , superclass)
self.classes[name] = c
end
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def sof_reference_name
"space"
end
end
# ObjectSpace
# :each_object, :garbage_collect, :define_finalizer, :undefine_finalizer, :_id2ref, :count_objects
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end