rework macro tests, or are they builtin

small fixes too

lib/mom/instruction/return_jump.rb

@@ -22,6 +22,10 @@ module Mom
     def to_risc(compiler)
       compiler.add_code Risc::Branch.new(self , return_label.risc_label(compiler))
     end
+
+    def to_s
+      "ReturnJump: #{return_label}"
+    end
   end
 
 

lib/mom/macro/exit.rb

@@ -3,7 +3,7 @@ module Mom
     def to_risc(compiler)
       builder = compiler.builder(compiler.source)
       builder.prepare_int_return # makes integer_tmp variable as return
-      Builtin.exit_sequence(builder)
+      Macro.exit_sequence(builder)
       return compiler
     end
   end

lib/mom/macro/macro.rb

@@ -1,6 +1,10 @@
 module Mom
   class Macro < Instruction
 
+    def to_s
+      self.class.name.split("::").last
+    end
+
     # emit the syscall with given name
     # there is a Syscall instruction, but the message has to be saved and restored
     def self.emit_syscall( builder , name )

lib/mom/macro/method_missing.rb

@@ -3,7 +3,7 @@ module Mom
     def to_risc(compiler)
       builder = compiler.builder(compiler.source)
       builder.prepare_int_return # makes integer_tmp variable as return
-      Builtin.emit_syscall( builder , :exit )
+      Macro.emit_syscall( builder , :exit )
       return compiler
     end
   end

lib/mom/macro/putstring.rb

@@ -7,7 +7,7 @@ module Mom
         word! << message[:receiver]
         integer! << word[Parfait::Word.get_length_index]
       end
-      Mom::Builtin.emit_syscall( builder , :putstring )
+      Mom::Macro.emit_syscall( builder , :putstring )
       compiler
     end
   end