give arm own instruction base class back

lib/arm/instructions/instruction.rb

@@ -0,0 +1,35 @@
+require "util/list"
+module Arm
+  # Arm instruction base class
+  # Mostly linked list functionality that all instructions have
+  class Instruction
+    include Constants
+    include Attributed
+    include Util::List
+
+    def initialize( source , nekst = nil )
+      @source = source
+      @next = nekst
+      return unless source
+      raise "Source must be string or Instruction, not #{source.class}" unless source.is_a?(String) or source.is_a?(Mom::Instruction)
+    end
+    attr_reader :source
+
+    def total_byte_length
+      ret = 0
+      self.each{|ins| ret += ins.byte_length}
+      ret
+    end
+
+    def set_position( position )
+      Positioned.set_position(self,position)
+      position += byte_length
+      if self.next
+        self.next.set_position( position )
+      else
+        position
+      end
+    end
+
+  end
+end