first go at message setups translation to risc

simplest possible implementation, ie the method and next_messages are
loaded many times.

But the layer design shines, it’s easy to understand

lib/mom/instruction/message_setup.rb

@@ -1,14 +1,18 @@
 module Mom
 
-  # Preamble when entering the method body.
-  # Acquiring the message basically.
+  # As reminder: a statically resolved call (the simplest one) becomes three Mom Instructions.
+  # Ie: MessageSetup,ArgumentTransfer,SimpleCall
   #
-  # Currently messages are hardwired as a linked list,
-  # but this does not account for continuations or closures and
-  # so will have to be changed.
+  # MessageSetup does Setup before a call can be made, acquiring and filling the message
+  # basically.
   #
-  # With the current setup this maps to a single SlotMove, ie 2 risc Instructions
-  # But clearer this way.
+  # With the current design the next message is already ready (hardwired as a linked list),
+  # so nothing to be done there.
+  # (but this does not account for continuations or closures and so will have to be changed)
+  #
+  # But we do need to set the message name to the called method's name,
+  # and also set the arg and local types on the new message, currently for debugging
+  # but later for dynamic checking
   #
   class MessageSetup < Instruction
     attr_reader :method
@@ -17,8 +21,15 @@ module Mom
         @method = method
     end
 
+    # Move method name, frame and arguemnt types from the method to the neext_message
+    # Assumes the message is ready, see class description
     def to_risc(compiler)
-      Risc::Label.new(self,"MethodSetup") 
+      name_move = SlotLoad.new( [:message , :next_message,:name] , [method , :name])
+      moves = name_move.to_risc(compiler)
+      args_move = SlotLoad.new( [:message , :next_message, :arguments,:type] , [method , :arguments, :type])
+      moves << args_move.to_risc(compiler)
+      type_move = SlotLoad.new( [:message , :next_message, :frame,:type] , [method , :frame,:type])
+      moves << type_move.to_risc(compiler)
     end
 
   end

lib/mom/instruction/slot_load.rb

@@ -102,7 +102,7 @@ module Mom
       type = known_object.respond_to?(:ct_type) ? known_object.ct_type : :int
       right = compiler.use_reg( type )
       case known_object
-      when Constant
+      when Constant , Parfait::Object
         const  = Risc.load_constant(instruction, self , right)
       when Symbol
         const = Risc::SlotToReg.new( instruction , Risc.resolve_to_register(known_object) ,

test/mom/assign/test_assign_local_send.rb

@@ -7,8 +7,9 @@ module Risc
     def setup
       super
       @input = "r = 5.mod4"
-      @expect = [Label, LoadConstant, SlotToReg, RegToSlot, Label, SlotToReg ,
-                 SlotToReg, RegToSlot]
+      @expect = [LoadConstant, SlotToReg, RegToSlot, LoadConstant, SlotToReg, SlotToReg ,
+                 RegToSlot, LoadConstant, SlotToReg, SlotToReg, RegToSlot, LoadConstant ,
+                 SlotToReg, RegToSlot, Label, SlotToReg, SlotToReg, RegToSlot]
     end
     def test_local_assign_instructions
       assert_nil msg = check_nil , msg