rename register to risc

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

lib/risc/positioned.rb

@@ -0,0 +1,32 @@
+# Helper module that extract position attribute.
+module Positioned
+  @positions = {}
+
+  def self.positions
+    @positions
+  end
+
+  def self.position(object)
+    pos = self.positions[object]
+    if pos == nil
+      str = "position accessed but not set, "
+      str += "#{object.object_id.to_s(16)}\n"
+      raise str + "for #{object.class} byte_length #{object.byte_length if object.respond_to?(:byte_length)} for #{object.inspect[0...100]}"
+    end
+    pos
+  end
+
+  def self.set_position( object , pos )
+    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)
+    #puts "Setting #{pos} for #{self.class}"
+    old = Positioned.positions[object]
+    if old != nil and ((old - pos).abs > 10000)
+      raise "position set again #{pos}!=#{old} for #{object}"
+    end
+    self.positions[object] = pos
+  end
+
+
+end