keep positions globally, not in the object

hopefully cleaner switch after bootstrapping

lib/register/positioned.rb

@@ -1,19 +1,30 @@
 # Helper module that extract position attribute.
 module Positioned
+  @@positions = {}
+
+  def self.positions
+    @@positions
+  end
+
   def position
-    if @position.nil?
-      str = "IN machine #{Register.machine.objects.has_key?(self.object_id)}, at #{self.object_id.to_s(16)}\n"
-      raise str + "position not set for #{self.class} byte_length #{byte_length} for #{self.inspect[0...100]}"
+    pos = Positioned.positions[self]
+    if pos == nil
+      str = "position accessed but not set, "
+      str += "#{Register.machine.objects.has_key?(self.object_id)}, at #{self.object_id.to_s(16)}\n"
+      raise str + "for #{self.class} byte_length #{byte_length} for #{self.inspect[0...100]}"
     end
-    @position
+    pos
   end
   def position= pos
-    raise "Setting of nil not allowed" if pos.nil?
+    raise "Position must be number not :#{pos}:" unless pos.is_a?(Numeric)
     # resetting of position used to be error, but since relink and dynamic instruction size it is ok.
     # in measures (of 32)
-    if @position != nil and ((@position - pos).abs > 10000)
-      raise "position set again #{pos}!=#{@position} for #{self}"
+    old = Positioned.positions[self]
+    if old != nil and ((old - pos).abs > 10000)
+      raise "position set again #{pos}!=#{old} for #{self}"
     end
-    @position = pos
+    Positioned.positions[self] = pos
   end
+
+
 end