reduce memory usage

tiramisu/option/optiondescription.py

@@ -79,9 +79,6 @@ class OptionDescription(BaseOption, StorageOptionDescription):
         self._group_type = groups.default
         self._is_build_cache = False
 
-    def impl_getrequires(self):
-        return self._requires
-
     def impl_getdoc(self):
         return self.impl_get_information('doc')
 
@@ -141,11 +138,11 @@ class OptionDescription(BaseOption, StorageOptionDescription):
             if option._get_id() in cache_option:  # pragma: optional cover
                 raise ConflictError(_('duplicate option: {0}').format(option))
             cache_option.append(option._get_id())
-            option._readonly = True
+            option._set_readonly()
             if isinstance(option, OptionDescription):
                 option.impl_validate_options(cache_option)
         if init:
-            self._readonly = True
+            self._set_readonly()
 
     # ____________________________________________________________
     def impl_set_group_type(self, group_type):
@@ -281,7 +278,7 @@ class OptionDescription(BaseOption, StorageOptionDescription):
 
     def _impl_get_dynchild(self, child, suffix):
         name = child.impl_getname() + suffix
-        path = self._name + suffix + '.' + name
+        path = self.impl_getname() + suffix + '.' + name
         if isinstance(child, OptionDescription):
             return SynDynOptionDescription(child, name, path, suffix)
         else:
@@ -289,7 +286,7 @@ class OptionDescription(BaseOption, StorageOptionDescription):
 
     def _impl_getchildren(self, dyn=True, context=undefined):
         for child in self._impl_st_getchildren(context):
-            cname = child._name
+            cname = child.impl_getname()
             if dyn and child.impl_is_dynoptiondescription():
                 path = cname
                 for value in child._impl_get_suffixes(context):