moving instrctions into own folders and arm machine out of the way

lib/virtual/instructions/access.rb

@@ -0,0 +1,25 @@
+module Virtual
+
+  # class for Set instructions, A set is basically a mem move.
+  # to and from are indexes into the known objects(frame,message,self and new_message), these are represented as slots
+  # (see there) 
+  # from may be a Constant (Object,Integer,String,Class)
+  class Set < Instruction
+    def initialize to , from
+      @to = to
+      # hard to find afterwards where it came from, so ensure it doesn't happen
+      raise "From must be slot or constant, not symbol #{from}" if from.is_a? Symbol
+      @from = from
+    end
+    attr_reader :to , :from
+  end
+
+  # Get a instance variable by _name_ . So we have to resolve the name to an index to trnsform into a Slot
+  # The slot may the be used in a set on left or right hand. The transformation is done by GetImplementation
+  class InstanceGet < Instruction
+    def initialize name
+      @name = name.to_sym
+    end
+    attr_reader :name
+  end
+end

lib/virtual/instructions/control.rb

@@ -0,0 +1,30 @@
+module Virtual
+  
+
+  # the first instruction we need is to stop. Off course in a real machine this would be a syscall, but that is just 
+  # an implementation (in a programm it would be a function). But in a virtual machine, not only do we need this instruction,
+  # it is indeed the first instruction as just this instruction is the smallest possible programm for the machine.
+  # As such it is the next instruction for any first instruction that we generate.
+  class Halt < Instruction    
+  end
+
+  class MethodReturn < Instruction
+  end
+
+  # a branch must branch to a block. This is an abstract class, names indicate the actual test
+  class Branch < Instruction
+    def initialize to
+      @to = to
+    end
+    attr_reader :to
+  end
+
+  # implicit means there is no explcit test involved.
+  # normal ruby rules are false and nil are false, EVERYTHING else is true (and that includes 0)
+  class ImplicitBranch < Branch
+  end
+
+  class UnconditionalBranch < Branch
+  end
+
+end

lib/virtual/instructions/messaging.rb

@@ -0,0 +1,28 @@
+module Virtual
+
+  # following classes are stubs. currently in brainstorming mode, so anything may change anytime
+  class MethodEnter < Instruction
+  end
+
+  class NewMessage < Instruction
+  end
+  class NewFrame < Instruction
+  end
+
+  class MessageSend < Instruction
+    def initialize name , me , args = []
+      @name = name.to_sym
+      @me = me
+      @args = args
+    end
+    attr_reader :name , :me ,  :args
+  end
+
+  class FunctionCall < Instruction
+    def initialize method
+      @method = method
+    end
+    attr_reader :method
+  end
+
+end