add the addresses from labels as constants

lib/mom/instruction/jump.rb

@@ -12,7 +12,7 @@ module Mom
       @label = label
     end
     def to_risc(compiler)
-      compiler.add_code Risc::Branch.new(self , @label.risc_label)
+      compiler.add_code Risc::Branch.new(self , @label.risc_label(compiler))
     end
   end
 

lib/mom/instruction/label.rb

@@ -32,19 +32,16 @@ module Mom
     end
 
     # generate the risc label lazily
-    def risc_label
+    def risc_label(comiler)
       @risc_label ||= Risc.label(self,name)
+      comiler.add_constant(@risc_label.address)
+      @risc_label
     end
 
     # add the risc_label to the compiler (instruction flow)
     # should only be called once
     def to_risc(compiler)
-      if( @added )
-        raise "added already #{@added}"
-      else
-        @added = true
-        compiler.add_code( risc_label )
-      end
+      compiler.add_code( risc_label(compiler) )
     end
   end
 end

lib/mom/instruction/not_same_check.rb

@@ -26,7 +26,7 @@ module Mom
       l_reg = left.to_register(compiler, self)
       r_reg = right.to_register(compiler, self)
       compiler.add_code Risc.op( self , :- , l_reg , r_reg)
-      compiler.add_code Risc::IsZero.new( self, false_jump.risc_label)
+      compiler.add_code Risc::IsZero.new( self, false_jump.risc_label(compiler))
     end
   end
 end

lib/mom/instruction/truth_check.rb

@@ -19,7 +19,7 @@ module Mom
     end
 
     def to_risc(compiler)
-      false_label = @false_jump.risc_label
+      false_label = @false_jump.risc_label(compiler)
       builder = compiler.builder("TruthCheck")
       condition_reg = @condition.to_register(compiler,self)
       builder.build do