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1996-01-30
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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . F I N A L I Z A T I O N _ I M P L E M E N T A T I O N --
-- --
-- S p e c --
-- --
-- $Revision: 1.16 $ --
-- --
-- Copyright (c) 1992,1993,1994 NYU, All Rights Reserved --
-- --
-- The GNAT library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU Library General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) any --
-- later version. The GNAT library is distributed in the hope that it will --
-- be useful, but WITHOUT ANY WARRANTY; without even the implied warranty --
-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- Library General Public License for more details. You should have --
-- received a copy of the GNU Library General Public License along with --
-- the GNAT library; see the file COPYING.LIB. If not, write to the Free --
-- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
-- ??? this package should be a private package. It is set as public for now
-- in order to simplify testing
package System.Finalization_Implementation is
pragma Preelaborate (Finalization_Implementation);
type Root;
subtype Finalizable is Root'Class;
type Finalizable_Ptr is access all Root'Class;
type Root is abstract tagged record
Prev : Finalizable_Ptr;
Next : Finalizable_Ptr;
end record;
procedure Initialize (Object : in out Root) is abstract;
procedure Finalize (Object : in out Root) is abstract;
-------------------------------------------------
-- Finalization Management Abstract Interface --
-------------------------------------------------
Global_Final_List : Finalizable_Ptr;
-- This list stores the controlled objects defined in library-level
-- packages. They will be finalized after the main program completion.
procedure Finalize_Global_List;
-- The procedure to be called in order to finalize the global list;
procedure Attach_To_Final_List
(L : in out Finalizable_Ptr;
Obj : in out Finalizable);
-- Put the finalizable object on a list of finalizable elements. This
-- procedure is called during the initialization of the controlled object.
procedure Finalize_List (L : Finalizable_Ptr);
-- Call Finalize on each element of the list L;
procedure Finalize_One
(From : in out Finalizable_Ptr;
Obj : in out Finalizable);
-- Call Finalize on Obj and remove it from the list From.
end System.Finalization_Implementation;