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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 --
--- --
--- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with System.Finalization_Root;
-
-package System.Finalization_Implementation is
- pragma Elaborate_Body;
-
- package SFR renames System.Finalization_Root;
-
- ------------------------------------------------
- -- Finalization Management Abstract Interface --
- ------------------------------------------------
-
- Global_Final_List : SFR.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 SFR.Finalizable_Ptr;
- Obj : in out SFR.Finalizable;
- Nb_Link : Short_Short_Integer);
- -- Attach finalizable object Obj to the linked list L. Nb_Link controls
- -- the number of link of the linked_list, and can be either 0 for no
- -- attachement, 1 for simple linked lists or 2 for doubly linked lists
- -- or even 3 for a simple attachement of a whole array of elements.
- -- Attachement to a simply linked list is not protected against
- -- concurrent access and should only be used in contexts where it
- -- doesn't matter, such as for objects allocated on the stack. In the
- -- case of an attachment on a doubly linked list, L must not be null
- -- and Obj will be inserted AFTER the first element and the attachment
- -- is protected against concurrent call. Typically used to attach to
- -- a dynamically allocated object to a List_Controller (whose first
- -- element is always a dummy element)
-
- procedure Finalize_List (L : SFR.Finalizable_Ptr);
- -- Call Finalize on each element of the list L;
-
- procedure Finalize_One (Obj : in out SFR.Finalizable);
- -- Call Finalize on Obj and remove its final list.
-
- ---------------------
- -- Deep Procedures --
- ---------------------
-
- procedure Deep_Tag_Initialize
- (L : in out SFR.Finalizable_Ptr;
- A : System.Address;
- B : Short_Short_Integer);
- -- Generic initialize for tagged objects with controlled components.
- -- A is the address of the object, L the finalization list when it needs
- -- to be attached and B the attachement level (see Attach_To_Final_List).
-
- procedure Deep_Tag_Adjust
- (L : in out SFR.Finalizable_Ptr;
- A : System.Address;
- B : Short_Short_Integer);
- -- Generic adjust for tagged objects with controlled components.
- -- A is the address of the object, L the finalization list when it needs
- -- to be attached and B the attachement level (see Attach_To_Final_List).
-
- procedure Deep_Tag_Finalize
- (L : in out SFR.Finalizable_Ptr;
- A : System.Address;
- B : Boolean);
- -- Generic finalize for tagged objects with controlled components.
- -- A is the address of the object, L the finalization list when it needs
- -- to be attached and B the attachement level (see Attach_To_Final_List).
-
- procedure Deep_Tag_Attach
- (L : in out SFR.Finalizable_Ptr;
- A : System.Address;
- B : Short_Short_Integer);
- -- Generic attachement for tagged objects with controlled components.
- -- A is the address of the object, L the finalization list when it needs
- -- to be attached and B the attachement level (see Attach_To_Final_List).
-
- -----------------------------
- -- Record Controller Types --
- -----------------------------
-
- -- Definition of the types of the controller component that is included
- -- in records containing controlled components. This controller is
- -- attached to the finalization chain of the upper-level and carries
- -- the pointer of the finalization chain for the lower level.
-
- type Limited_Record_Controller is new SFR.Root_Controlled with record
- F : SFR.Finalizable_Ptr;
- end record;
-
- procedure Initialize (Object : in out Limited_Record_Controller);
- -- Does nothing.
-
- procedure Finalize (Object : in out Limited_Record_Controller);
- -- Finalize the controlled components of the enclosing record by
- -- following the list starting at Object.F.
-
- type Record_Controller is
- new Limited_Record_Controller with record
- My_Address : System.Address;
- end record;
-
- procedure Initialize (Object : in out Record_Controller);
- -- Initialize the field My_Address to the Object'Address
-
- procedure Adjust (Object : in out Record_Controller);
- -- Adjust the components and their finalization pointers by subtracting
- -- by the offset of the target and the source addresses of the assignment.
-
- -- Inherit Finalize from Limited_Record_Controller
-
- procedure Detach_From_Final_List (Obj : in out SFR.Finalizable);
- -- Remove the specified object from its Final list, which must be a
- -- doubly linked list.
-
-end System.Finalization_Implementation;