fix test result, but not test yet

lib/interpreter/interpreter.rb

@@ -170,5 +170,17 @@ module Interpreter
       # we jump back to the call instruction. so it is as if the call never happened and we continue
       true
     end
+
+    def execute_OperatorInstruction
+      case @instruction.operator
+      when :add
+        puts @instruction
+        
+      else
+        raise "unimplemented operator #{@instruction}"
+      end
+
+      true
+    end
   end
 end

lib/register/builtin/integer.rb

@@ -7,9 +7,15 @@ module Register
           plus_function = Virtual::MethodSource.create_method(:Integer,:plus , [:Integer] )
           plus_function.source.return_type = Virtual::Integer
           plus_function.source.receiver = Virtual::Integer
-          plus_function.source.add_code Register::OperatorInstruction.new( plus_function, :add , 0 , 0 )
+          
+          tmp = Register.tmp_reg
+          index = Register.arg_index 1
+          plus_function.source.add_code Register.get_slot( plus_function , :message , index , tmp )
+          add = Register::OperatorInstruction.new( plus_function, :add ,  tmp , Register.self_reg )
+          plus_function.source.add_code add
           return plus_function
         end
+
         # The conversion to base10 is quite a bit more complicated than i thought.
         # The bulk of it is in div10
         # We set up variables, do the devision and write the result to the string

lib/register/instructions/operator_instruction.rb

@@ -7,7 +7,7 @@ module Register
       @left = left
       @right = right
     end
-    attr_reader :left , :right
+    attr_reader :operator, :left , :right
 
     def to_s
       "OperatorInstruction: #{left} #{operator} #{right}"

lib/register/register_reference.rb

@@ -126,4 +126,11 @@ module Register
     end
     return register
   end
+
+  # when knowing the index of the argument, return the index into the message
+  # index passed is parfait, ie stats at 1
+  def self.arg_index i
+    last = resolve_index :message , :name
+    return last + i
+  end
 end