renaming, making space for extra layer

lib/neumann/call_site.rb

@@ -0,0 +1,37 @@
+module Vm
+
+  # name and args , return
+
+  class CallSite < Value
+
+    def initialize(name , value , args , function )
+      @name = name
+      @value = value    
+      @args = args
+      @function = function
+      raise "oh #{name} " unless value
+    end
+    attr_reader  :function , :args , :name , :value
+
+    def load_args into
+      if value.is_a?(IntegerConstant) or value.is_a?(ObjectConstant)
+        function.receiver.load into , value
+      else
+        raise "meta #{name} " if value.is_a? Boot::MetaClass
+        function.receiver.move( into, value ) if value.register_symbol != function.receiver.register_symbol
+      end
+      raise "function call '#{args.inspect}' has #{args.length} arguments, but function has #{function.args.length}" if args.length != function.args.length
+      args.each_with_index do |arg , index|
+        if arg.is_a?(IntegerConstant) or arg.is_a?(StringConstant)
+          function.args[index].load into , arg
+        else
+          function.args[index].move( into, arg ) if arg.register_symbol != function.args[index].register_symbol
+        end
+      end
+    end
+
+    def do_call into
+      RegisterMachine.instance.function_call into , self
+    end
+  end
+end