implement ivar assignment

lib/vm/method_compiler/assignment.rb

@@ -1,6 +1,18 @@
 module Vm
   module Assignment
 
+    def on_IvarAssignment( statement )
+      value = assignment_value(statement)
+      name = check_name(statement.name.name)
+      index = @method.for_type.variable_index( name)
+      raise "No such ivar #{name}  #{@method.for_type}" unless index
+      value_type = @method.for_type.type_at( index )
+      raise "Argument Type mismatch #{value.type}!=#{value_type}" unless value.type == value_type
+      value_reg = use_reg(:value_type)
+      add_slot_to_reg(statement , :message , :receiver , value_reg )
+      add_reg_to_slot(statement , value , value_reg , index + 1 ) # one for type
+    end
+
     def on_LocalAssignment( statement )
       do_assignment_for( statement , :local )
     end
@@ -12,7 +24,7 @@ module Vm
     private
 
     def do_assignment_for( statement , type )
-      value = assignemnt_value(statement)
+      value = assignment_value(statement)
       name = check_name(statement.name.name)
       index = @method.send( "has_#{type}" , name)
       raise "No such #{type} #{name}  #{@method.inspect}" unless index
@@ -27,7 +39,7 @@ module Vm
       add_reg_to_slot(statement , value , named_list , index + 1 ) # one for type
     end
 
-    def assignemnt_value(statement)
+    def assignment_value(statement)
       reset_regs # statements reset registers, ie have all at their disposal
       value = process(statement.value)
       raise "Not register #{v}" unless value.is_a?(Register::RegisterValue)