introduce some helper methods

lib/risc/machine.rb

@@ -85,7 +85,7 @@ module Risc
     def position_all
       raise "Not translated " unless @translated
       #need the initial jump at 0 and then functions
-      Position.init(cpu_init , -1)
+      Position.new(cpu_init , 0)
       code_start = position_objects( @platform.padding )
       # and then everything code
       position_code(code_start)
@@ -101,8 +101,8 @@ module Risc
       sorted.each do | objekt|
         next if objekt.is_a?( Parfait::BinaryCode) or objekt.is_a?( Risc::Label )
         before = at
-        position = Position.init(objekt,at)
-        previous.register_event(:position_changed , PositionListener.new(objekt)) if previous
+        position = Position.new(objekt , at)
+        previous.position_listener(objekt) if previous
         previous = position
         at += objekt.padded_length
         log.debug "Object #{objekt.class}:#{before.to_s(16)} len: #{(at - before).to_s(16)}"
@@ -123,7 +123,7 @@ module Risc
         type.methods.each_method do |method|
           last_code = CodeListener.init(method.binary , code_start)
           InstructionListener.init(method.cpu_instructions, method.binary)
-          last_code.register_event(:position_changed , prev_code.object) if prev_code
+          last_code.position_listener( prev_code.object) if prev_code
           prev_code = last_code
           code_start = last_code.next_slot
         end