@@ -266,28 +266,30 @@ package Einfo is
-- The flag Has_Delayed_Freeze indicates that an entity carries an explicit
-- freeze node, which appears later in the expanded tree.
+-- a) The flag is used by the front end to trigger expansion activities which
-- include the generation of that freeze node. Typically this happens at the
-- end of the current compilation unit, or before the first subprogram body is
+-- encountered in the current unit. See units Freeze and Exp_Ch13 for details
-- on the actions triggered by a freeze node, which include the construction
-- of initialization procedures and dispatch tables.
+-- b) The presence of a freeze node on an entity is used by the back end to
-- defer elaboration of the entity until its freeze node is seen. In the
-- absence of an explicit freeze node, an entity is frozen (and elaborated)
-- at the point of declaration.
-- For object declarations, the flag is set when an address clause for the
-- object is encountered. Legality checks on the address expression only take
+-- place at the freeze point of the object. In Ada 2012, the flag is also set
+-- when an address or an alignment aspect for the object is encountered (note
+-- the discrepancy with the non-aspect case).
-- Most types have an explicit freeze node, because they cannot be elaborated
-- until all representation and operational items that apply to them have been
-- analyzed. Private types and incomplete types have the flag set as well, as
-- do task and protected types.
+-- Implicit base types created for type derivations, as well as class-wide
-- types created for all tagged types, have the flag set.
-- If a subprogram has an access parameter whose designated type is incomplete