move passes to own dir

lib/register/passes/set_implementation.rb

@@ -0,0 +1,46 @@
+Virtual::MessageSlot.class_eval do
+  def reg
+    Register::RegisterReference.new(Virtual::Message::MESSAGE_REG )
+  end
+end
+Virtual::FrameSlot.class_eval do
+  def reg
+    Register::RegisterReference.new(Virtual::Message::FRAME_REG )
+  end
+end
+Virtual::SelfSlot.class_eval do
+  def reg
+    Register::RegisterReference.new(Virtual::Message::SELF_REG )
+  end
+end
+Virtual::NewMessageSlot.class_eval do
+  def reg
+    Register::RegisterReference.new(Virtual::Message::NEW_MESSAGE_REG )
+  end
+end
+
+module Register
+  # This implements setting of the various slot variables the vm defines. 
+  # Basic mem moves, but have to shuffle the type nibbles
+  
+  class SetImplementation
+    def run block
+      block.codes.dup.each do |code|
+        next unless code.is_a? Virtual::Set
+        # resolve the register and offset that we need to move to
+        to = code.to.reg
+        # need a temporay place because of indexed load/store
+        tmp = RegisterReference.new(Virtual::Message::TMP_REG)
+        # for constants we have to "move" the constants value
+        if( code.from.is_a? Virtual::Constant)
+          move1 = RegisterMachine.instance.mov( tmp , code.from )
+        else # while otherwise we "load"
+          move1 = RegisterMachine.instance.ldr( tmp , code.from.reg , code.from.index )
+        end
+        move2 = RegisterMachine.instance.str( tmp , to , code.to.index )
+        block.replace(code , [move1,move2] )
+      end
+    end
+  end
+  Virtual::BootSpace.space.add_pass_after SetImplementation , Virtual::GetImplementation
+end