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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) 1992-2009, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Ada.Unchecked_Conversion; with System.Storage_Elements; with System.Finalization_Root; package System.Finalization_Implementation is pragma Elaborate_Body; package SSE renames System.Storage_Elements; package SFR renames System.Finalization_Root; ------------------------------------------------ -- Finalization Management Abstract Interface -- ------------------------------------------------ function To_Finalizable_Ptr is new Ada.Unchecked_Conversion (Source => System.Address, Target => SFR.Finalizable_Ptr); Collection_Finalization_Started : constant SFR.Finalizable_Ptr := To_Finalizable_Ptr (SSE.To_Address (1)); -- This is used to implement the rule in RM 4.8(10.2/2) that requires an -- allocator to raise Program_Error if the collection finalization has -- already started. See also Ada.Finalization.List_Controller. Finalize on -- List_Controller first sets the list to Collection_Finalization_Started, -- to indicate that finalization has started. An allocator will call -- Attach_To_Final_List, which checks for the special value and raises -- Program_Error if appropriate. The Collection_Finalization_Started value -- must be different from 'Access of any finalizable object, and different -- from null. See AI-280. 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 is one of: 0 for no attachment, 1 -- for simple linked lists or 2 for doubly linked lists or even 3 for a -- simple attachment of a whole array of elements. Attachment 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) type Finalizable_Ptr_Ptr is access all SFR.Finalizable_Ptr; -- A pointer to a finalization list. This is used as the type of the extra -- implicit formal which are passed to build-in-place functions that return -- controlled types (see Sem_Ch6). That extra formal is then passed on to -- Move_Final_List (below). procedure Move_Final_List (From : in out SFR.Finalizable_Ptr; To : Finalizable_Ptr_Ptr); -- Move all objects on From list to To list. This is used to implement -- build-in-place function returns. The return object is initially placed -- on a finalization list local to the return statement, in case the -- return statement is left prematurely (due to raising an exception, -- being aborted, or a goto or exit statement). Once the return statement -- has completed successfully, Move_Final_List is called to move the -- return object to the caller's finalization list. 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_Attach (L : in out SFR.Finalizable_Ptr; A : System.Address; B : Short_Short_Integer); -- Generic attachment 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 attachment 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; overriding procedure Initialize (Object : in out Limited_Record_Controller); -- Does nothing currently overriding 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; overriding procedure Initialize (Object : in out Record_Controller); -- Initialize the field My_Address to the Object'Address overriding 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;
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