rename register to risc

seems to fit the layer much better as we really have a very reduced
instruction set

lib/risc/instructions/load_constant.rb

@@ -0,0 +1,36 @@
+module Risc
+  # load a constant into a register
+  #
+  # first is the actual constant, either immediate register or object reference (from the space)
+  # second argument is the register the constant is loaded into
+
+  class LoadConstant < Instruction
+    def initialize source , constant , register
+      super(source)
+      @register = register
+      @constant = constant
+    end
+    attr_accessor :register , :constant
+
+    def to_s
+      "LoadConstant: #{register} <- #{constant_str}"
+    end
+
+    private
+    def constant_str
+      case @constant
+      when String , Symbol , Fixnum , Integer
+        @constant.to_s
+      else
+        if( @constant.respond_to? :sof_reference_name )
+          constant.sof_reference_name
+        else
+          constant.class.name.to_s
+        end
+      end
+    end
+  end
+  def self.load_constant( source , constant , register )
+    LoadConstant.new source , constant , register
+  end
+end