96 lines
2.4 KiB
Ruby
96 lines
2.4 KiB
Ruby
module Register
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class LinkSlot
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def initialize at
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@position = position
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@length = 0
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end
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attr_accessor :position , :length
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end
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class Linker
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def initialize
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@objects = {}
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end
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def get_slot(object)
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@objects[object.object_id]
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end
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def link_object(object , at)
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slot = @objects[object.object_id]
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unless slot
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slot = LinkSlot.new at
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@objects[object.object_id] = slot
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end
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if object.is_a? Instruction
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length = 4
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else
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clazz = object.class.name.split("::").last
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length = send("link_#{clazz}".to_sym , object , at)
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end
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slot.length = length
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length
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end
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def link_Array( array , at)
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length = 0
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array.each do |elem|
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length += link_object(elem , at + length)
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end
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# also array has constant overhead, the members helper fixes it to multiple of 8
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members(length)
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end
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def link_BootSpace(space , at)
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length = members( 2 )
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length += link_Array( space.classes.values , at + length )
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length + link_Array(space.objects , at + length)
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end
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def link_BootClass(clazz , at)
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length = members(3)
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length += link_object(clazz.name , at + length)
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length += link_object(clazz.super_class_name , at + length)
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length + link_Array(clazz.instance_methods , at + length)
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end
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def link_CompiledMethod(method , at)
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length = members(2)
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length += link_object(method.name ,at + length)
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# NOT an ARRAY, just a bag of bytes
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method.blocks.each do |block|
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length += link_object( block ,at + length)
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end
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length
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end
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def link_Block(block , at)
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len = 0
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# NOT linking as an array, as we need the strem that makes the method
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block.codes.each do |code|
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len += link_object(code , at + len)
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end
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len
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end
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def link_String( str , at)
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return members(str.length / 4)
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end
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def link_Symbol(sym , at)
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return link_String(sym.to_s , at)
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end
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def link_StringConstant( sc , at)
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return link_String(sc.string,at)
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end
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# objects only come in lengths of multiple of 8
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# but there is a constant overhead of 2, one for type, one for layout
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# and as we would have to subtract 1 to make it work without overhead, we now have to add 1
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def members len
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8 * (1 + (len + 1) / 8)
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end
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end
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end |