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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --     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      --
   6 --                                                                          --
   7 --                                S p e c                                   --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with System.Finalization_Root;
  33
  34 package Ada.Finalization.List_Controller is
  35    pragma Elaborate_Body;
  36
  37    package SFR renames System.Finalization_Root;
  38
  39    ----------------------------
  40    -- Simple_List_Controller --
  41    ----------------------------
  42
  43    type Simple_List_Controller is new Ada.Finalization.Limited_Controlled
  44      with record
  45         F : SFR.Finalizable_Ptr;
  46      end record;
  47       --  Used by the compiler to carry a list of temporary objects that
  48       --  needs to be finalized after having being used. This list is
  49       --  embedded in a controlled type so that if an exception is raised
  50       --  while those temporaries are still in use, they will be reclaimed
  51       --  by the normal finalization mechanism.
  52
  53    overriding procedure Finalize (Object : in out Simple_List_Controller);
  54
  55    ---------------------
  56    -- List_Controller --
  57    ---------------------
  58
  59    --  Management of a bidirectional linked heterogeneous list of
  60    --  dynamically Allocated objects. To simplify the management of the
  61    --  linked list, the First and Last elements are statically part of the
  62    --  original List controller:
  63    --
  64    --        +------------+
  65    --        |          --|-->--
  66    --        +------------+
  67    --        |--<--       |                      record with ctrl components
  68    --        |------------|                         +----------+
  69    --     +--|--   L      |                         |          |
  70    --     |  |------------|                         |          |
  71    --     |  |+--------+  |       +--------+        |+--------+|
  72    --     +->||  prev  | F|---<---|--      |----<---||--      ||--<--+
  73    --        ||--------| i|       |--------|        ||--------||     |
  74    --        || next   | r|--->---|      --|---->---||      --||--------+
  75    --        |+--------+ s|       |--------|        ||--------||     |  |
  76    --        |           t|       | ctrl   |        ||        ||     |  |
  77    --        |            |       :        :        |+--------+|     |  |
  78    --        |            |       : object :        |rec       |     |  |
  79    --        |            |       :        :        |controller|     |  |
  80    --        |            |       |        |        |          |     |  v
  81    --        |+--------+  |       +--------+        +----------+     |  |
  82    --        ||  prev -|-L|--------------------->--------------------+  |
  83    --        ||--------| a|                                             |
  84    --        || next   | s|-------------------<-------------------------+
  85    --        |+--------+ t|
  86    --        |            |
  87    --        +------------+
  88
  89    type List_Controller is new Ada.Finalization.Limited_Controlled
  90      with record
  91         F    :  SFR.Finalizable_Ptr;
  92         First,
  93         Last : aliased SFR.Root_Controlled;
  94      end record;
  95    --  Controls the chains of dynamically allocated controlled
  96    --  objects makes sure that they get finalized upon exit from
  97    --  the access type that defined them
  98
  99    overriding procedure Initialize (Object : in out List_Controller);
 100    overriding procedure Finalize   (Object : in out List_Controller);
 101
 102 end Ada.Finalization.List_Controller;