add NewMessage / Frame instructions (without actual implementation)

lib/ast/call_site_expression.rb

@@ -6,16 +6,18 @@ module Ast
 
     def compile method , message
       me = receiver.compile( method, message )
+      method.add_code Virtual::NewMessage.new
       method.add_code Virtual::Set.new(Virtual::NewSelf.new(me.type), me)
       method.add_code Virtual::Set.new(Virtual::NewName.new(), Virtual::StringConstant.new(name))
       compiled_args = []
       args.each_with_index do |arg , i|
         #compile in the running method, ie before passing control
         val = arg.compile( method, message) 
-        compiled_args << val
         # move the compiled value to it's slot in the new message
+        to = Virtual::NewMessageSlot.new(i ,val.type , val)
         # (doing this immediately, not after the loop, so if it's a return it won't get overwritten)
-        method.add_code Virtual::Set.new(Virtual::NewMessageSlot.new(i ,val.type ) , val )
+        method.add_code Virtual::Set.new(to , val )
+        compiled_args << to
       end
       method.add_code Virtual::MessageSend.new(name , me , compiled_args) #and pass control
       # the effect of the method is that the NewMessage Return slot will be filled, return it

lib/register/return_implementation.rb

@@ -2,6 +2,10 @@ module Register
   class ReturnImplementation
     def run block
       block.codes.dup.each do |code|
+        
+        #TODO
+        - move message to new meesage 
+        - restore caller message and self / frame
         next unless code.is_a? Virtual::MethodReturn
         #load the return address into pc, affecting return. (other cpus have commands for this, but not arm)
         message = RegisterReference.new(:r0)

lib/virtual/instruction.rb

@@ -66,6 +66,11 @@ module Virtual
   class UnconditionalBranch < Branch
   end
 
+  class NewMessage < Instruction
+  end
+  class NewFrame < Instruction
+  end
+
   class MessageSend < Instruction
     def initialize name , me , args = []
       @name = name.to_sym

lib/virtual/send_implementation.rb

@@ -1,11 +1,17 @@
 module Virtual
   # This implements the send logic
   # Send is so complicated that we actually code it in ruby and stick it in
-  # That off course opens up an endless loop possibility that we stop by reducing to Class and Module methods
+  # That off course opens up an endless loop possibility that we stop by
+  # implementing Class and Module methods
+
+  # Note: I find it slightly unsemetrical that the NewMessage object needs to be created before this instruction
+  #       This is because all expressions create a (return) value and that return value is overwritten by the next
+  #       expression unless saved. And since the message is the place to save it it needs to exist. qed
   class SendImplementation
     def run block
       block.codes.dup.each do |code|
         next unless code.is_a? MessageSend
+        new_codes = [  ]
         ref = code.me
         raise "only refs implemented #{me.inspect}" unless ( ref.type == Reference)
         if(ref.value)
@@ -16,14 +22,14 @@ module Virtual
             # get the function from my class. easy peasy
             method = me.clazz.get_instance_method(code.name)
             raise "Method not implemented #{clazz.name}.#{code.name}" unless method
-            call = FunctionCall.new( method )
-            block.replace(code , call )
+            new_codes << FunctionCall.new( method )
           else
             raise "unimplemented #{code}"
           end
         else
-          raise "not constant/ known object for send #{me.inspect}"
+          raise "not constant/ known object for send #{ref.inspect}"
         end
+        block.replace(code , new_codes )
       end
     end
   end