42 lines
1.4 KiB
Ruby
42 lines
1.4 KiB
Ruby
# An Object is really a hash like structure. It is dynamic and
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# you want to store values by name (instance variable names).
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#
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# One could (like mri), store the names in each object, but that is wasteful
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# Instead we store only the values, and access them by index.
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# The Layout allows the mapping of names to index.
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# The Layout of an object describes the memory layout of the object
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# The Layout is a simple list of the names of instance variables.
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#
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# As every object has a Layout to describe it, the name "layout" is the
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# first name in the list for every Layout.
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# But as we want every Object to have a class, the Layout carries that class.
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# So the layout of layout has an entry "object_class"
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# In other words, the Layout is a list of names that describe
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# the values stored in an actual object.
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# The object is an List of values of length n and
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# the Layout is an List of names of length n
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# Together they turn the object into a hash like structure
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module Parfait
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class Layout < List
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# set the names of the instance variables in one go
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# used while booting the classes. At runtime the list would grow dynamically
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def set_names list
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self.set_length list.length
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index = 0
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while index < list.length do
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list.set(index , array.get(index))
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end
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end
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# beat the recursion! fixed known offset for class object in the layout
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def get_object_class()
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return internal_object_get(CLASS_INDEX)
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end
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end
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end
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