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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--     A D A . F I N A L I Z A T I O N . L I S T _ C O N T R O L L E R      --

--                                                                          --

--                                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 System.Finalization_Root;

package Ada.Finalization.List_Controller is

   pragma Elaborate_Body;

   package SFR renames System.Finalization_Root;

   ----------------------------

   -- Simple_List_Controller --

   ----------------------------

   type Simple_List_Controller is new Ada.Finalization.Limited_Controlled

     with record

        F : SFR.Finalizable_Ptr;

     end record;

      --  Used by the compiler to carry a list of temporary objects that

      --  needs to be finalized after having being used. This list is

      --  embedded in a controlled type so that if an exception is raised

      --  while those temporaries are still in use, they will be reclaimed

      --  by the normal finalization mechanism.

   overriding procedure Finalize (Object : in out Simple_List_Controller);

   ---------------------

   -- List_Controller --

   ---------------------

   --  Management of a bidirectional linked heterogeneous list of

   --  dynamically Allocated objects. To simplify the management of the

   --  linked list, the First and Last elements are statically part of the

   --  original List controller:

   --

   --        +------------+

   --        |          --|-->--

   --        +------------+

   --        |--<--       |                      record with ctrl components

   --        |------------|                         +----------+

   --     +--|--   L      |                         |          |

   --     |  |------------|                         |          |

   --     |  |+--------+  |       +--------+        |+--------+|

   --     +->||  prev  | F|---<---|--      |----<---||--      ||--<--+

   --        ||--------| i|       |--------|        ||--------||     |

   --        || next   | r|--->---|      --|---->---||      --||--------+

   --        |+--------+ s|       |--------|        ||--------||     |  |

   --        |           t|       | ctrl   |        ||        ||     |  |

   --        |            |       :        :        |+--------+|     |  |

   --        |            |       : object :        |rec       |     |  |

   --        |            |       :        :        |controller|     |  |

   --        |            |       |        |        |          |     |  v

   --        |+--------+  |       +--------+        +----------+     |  |

   --        ||  prev -|-L|--------------------->--------------------+  |

   --        ||--------| a|                                             |

   --        || next   | s|-------------------<-------------------------+

   --        |+--------+ t|

   --        |            |

   --        +------------+

   type List_Controller is new Ada.Finalization.Limited_Controlled

     with record

        F    :  SFR.Finalizable_Ptr;

        First,

        Last : aliased SFR.Root_Controlled;

     end record;

   --  Controls the chains of dynamically allocated controlled

   --  objects makes sure that they get finalized upon exit from

   --  the access type that defined them

   overriding procedure Initialize (Object : in out List_Controller);

   overriding procedure Finalize   (Object : in out List_Controller);

end Ada.Finalization.List_Controller;