Changing the call setup and return to be more efficient

Now we are using a statically linked list of messages. This will not work with procs, but that can be solved then.

Previous (wrong) thinking was that because of procs messages have to be allocated for every call. This was too slow, and not neccessary

lib/mom/instruction/message_setup.rb

@@ -59,25 +59,10 @@ module Mom
       "method setup "
     end
 
-    # get the next message from space and unlink it there
-    # also put it into next_message of current message (and reverse)
     # set the method into the message
     def build_message_data( builder )
       builder.build do
-        factory? << Parfait.object_space.get_factory_for(:Message)
-        next_message? << factory[:next_object]
-
-        #FIXME in a multithreaded future this should be done using lock free compare and swap.
-        next_message_reg! << next_message[:next_message]
-        factory[:next_object] << next_message_reg
-
-        # FIXME: Also we relink used messages at the moment. This will have to stop
-        #        when implementing continuations (or block passing/bindings)
-        #        then we may run out and that means cheking and maybe getting more
-        message[:next_message] << next_message
-        next_message[:caller] << message
-        next_message[:method] << callable
-
+        next_message?[:method] << callable
       end
     end
   end

lib/mom/instruction/return_sequence.rb

@@ -26,19 +26,12 @@ module Mom
         object! << message[:return_value]
         caller_reg! << message[:caller]
         caller_reg[:return_value] << object
-        factory? << Parfait.object_space.get_factory_for(:Message)
-        # here we return the current message to the list of messages
-        # which is only correct without blocks or real continuations
-        next_message! << factory[:next_object]
-        message[:next_message] << next_message
-        factory[:next_object] << message
       end
-      compiler.reset_regs
       builder.build do
         return_address! << message[:return_address]
         return_address << return_address[ Parfait::Integer.integer_index]
         message << message[:caller]
-        return_address.function_return
+        add_code Risc.function_return("return", return_address)
       end
     end
 

lib/risc/register_value.rb

@@ -171,14 +171,6 @@ module Risc
       op
     end
 
-    # generate a Function return instruction
-    # using the register as the parameter where the return address is passed
-    def function_return
-      ret = Risc.function_return("return", self)
-      builder.add_code(ret) if builder
-      ret
-    end
-
     # create operator instruction for self and add
     # doesn't read quite as smoothly as one would like, but better than the compiler version
     def op( operator , right)