rename register to risc

seems to fit the layer much better as we really have a very reduced
instruction set

lib/risc/instructions/label.rb

@@ -0,0 +1,85 @@
+module Risc
+
+  # A label is a placeholder for it's next Instruction
+  # It's function is not to turn into code, but to be a valid brnch target
+  #
+  # So branches and Labels are pairs, fan out, fan in
+  #
+  #
+
+  class Label < Instruction
+    def initialize( source , name , nekst = nil)
+      super(source , nekst)
+      @name = name
+    end
+    attr_reader :name
+
+    def to_s
+      "Label: #{@name} (#{self.next.class.name.split("::").last})"
+    end
+
+    def sof_reference_name
+      @name
+    end
+
+    # a method start has a label of the form Class.method , test for that
+    def is_method
+      @name.split(".").length == 2
+    end
+
+    def to_arr labels = []
+      return [] if labels.include?(self)
+      labels << self
+      super
+    end
+
+    def length labels = []
+      return 0 if labels.include?(self)
+      labels << self
+      ret = 1
+      ret += self.next.length(labels) if self.next
+      ret
+    end
+
+    def assemble io
+    end
+
+    def assemble_all io , labels = []
+      return if labels.include?(self)
+      labels << self
+      self.next.assemble_all(io,labels)
+    end
+
+    def total_byte_length labels = []
+      return 0 if labels.include?(self)
+      labels << self
+      ret = self.next.total_byte_length(labels)
+      #puts "#{self.class.name} return #{ret}"
+      ret
+    end
+
+    # labels have the same position as their next
+    def set_position position , labels = []
+      return position if labels.include?(self)
+      labels << self
+      super(position , labels)
+      self.next.set_position(position,labels)
+    end
+
+    # shame we need this, just for logging
+    def byte_length
+      0
+    end
+
+    def each_label labels =[] , &block
+      return if labels.include?(self)
+      labels << self
+      block.yield(self)
+      super
+    end
+  end
+
+  def self.label( source , name , nekst = nil)
+    Label.new( source , name , nekst = nil)
+  end
+end