rename blocks do_add to be the same as sunctions add_code to blur the difference

lib/vm/block.rb

@@ -41,7 +41,7 @@ module Vm
       ret
     end
 
-    def do_add kode
+    def add_code kode
       kode.assigns.each { |a| (@assigns << a) unless @assigns.include?(a) }
       kode.uses.each { |use| (@uses << use) unless (@assigns.include?(use) or @uses.include?(use)) }
       #puts "IN ADD #{name}#{uses}" 

lib/vm/function.rb

@@ -140,7 +140,7 @@ module Vm
     def add_code(kode)
       raise "alarm #{kode}" if kode.is_a? Word
       raise "alarm #{kode.class} #{kode}" unless kode.is_a? Code
-      @insert_at.do_add kode
+      @insert_at.add_code kode
       self
     end
 

lib/vm/values/reference.rb

@@ -1,9 +1,11 @@
 module Vm
   class Reference < Word
     # needs to be here as Word's constructor is private (to make it abstract)
-    def initialize reg
-      super
+    def initialize reg , clazz = nil
+      super(reg)
+      @clazz = clazz
     end
+    attr_accessor :clazz
 
   end
 end