fixin up mov arguments

lib/vm/c_machine.rb

@@ -51,7 +51,7 @@ module Vm
         define_instruction_three(inst , LogicInstruction)
       end
       [:mov, :mvn].each do |inst|
-        define_instruction_one(inst , MoveInstruction)
+        define_instruction_two(inst , MoveInstruction)
       end
       [:cmn, :cmp, :teq, :tst].each do |inst|
         define_instruction_two(inst , CompareInstruction)

lib/vm/call_site.rb

@@ -13,7 +13,7 @@ module Vm
     
     def load_args into
       args.each_with_index do |arg , index|
-        if arg.is_a? IntegerConstant
+        if arg.is_a?(IntegerConstant) or arg.is_a?(StringConstant)
           Vm::Integer.new(index).load into , arg
         else
           Vm::Integer.new(index).move( into, arg ) if arg.register != index

lib/vm/instruction.rb

@@ -64,8 +64,9 @@ module Vm
     end
   end
   class MoveInstruction < Instruction
-    def initialize first , options
-      @first = first
+    def initialize to , from , options
+      @to = to
+      @from = from
       super(options)
     end
   end