fold last of the virtual into register

lib/register/minimizer.rb

@@ -0,0 +1,40 @@
+module Register
+
+  # Remove all functions that are not called
+  # Not called is approximated by the fact that the method name doesn't show up
+  # in any function reachable from main
+  class Minimizer
+    def run
+      @gonners = []
+      Parfait::Space.object_space.classes.values.each do |c|
+        c.instance_methods.each do |f|
+          @gonners << f
+        end
+      end
+      keep Register.machine.space.get_init
+      remove_remaining
+    end
+
+    def keep function
+      index = @gonners.index function
+      unless index
+        puts "function was already removed #{function.name}"
+        return
+      end
+      #puts "stayer #{function.name}"
+      @gonners.delete function
+      function.source.blocks.each do |block|
+        block.codes.each do |code|
+          keep code.method if code.is_a? FunctionCall
+        end
+      end
+    end
+
+    def remove_remaining
+      @gonners.each do |method|
+        next if(method.name == :plus)
+        method.for_class.remove_instance_method method.name
+      end
+    end
+  end
+end