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diff --git a/gcc/ada/s-finimp.ads b/gcc/ada/s-finimp.ads new file mode 100644 index 00000000000..49db440a0ec --- /dev/null +++ b/gcc/ada/s-finimp.ads @@ -0,0 +1,151 @@ +------------------------------------------------------------------------------ +-- -- +-- 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: 1.31 $ -- +-- -- +-- Copyright (C) 1992-1998 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, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +with System.Finalization_Root; + +package System.Finalization_Implementation is +pragma Elaborate_Body (Finalization_Implementation); + + 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 context 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 substracting + -- 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; |