move to virtual as it leaves vm instructions

lib/virtual/passes/enter_implementation.rb

@@ -0,0 +1,17 @@
+module Register
+
+  class EnterImplementation
+    def run block
+      block.codes.dup.each do |code|
+        next unless code.is_a? Virtual::MethodEnter
+        new_codes = []
+        # save return register and create a new frame
+        # lr is link register, ie where arm stores the return address when call is issued
+        new_codes << RegisterMachine.instance.str( :lr , Virtual::Slot::MESSAGE_REGISTER , Virtual::Slot::MESSAGE_RETURN_ADDRESS )
+        new_codes << Virtual::NewFrame.new
+        block.replace(code , new_codes )
+      end
+    end
+  end
+  Virtual::BootSpace.space.add_pass_after "Register::EnterImplementation" , "Virtual::GetImplementation"
+end