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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                 S Y S T E M . S T O R A G E _ P O O L S                  --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2013, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the  contents of the part following the private keyword. --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  21 --                                                                          --
  22 -- As a special exception under Section 7 of GPL version 3, you are granted --
  23 -- additional permissions described in the GCC Runtime Library Exception,   --
  24 -- version 3.1, as published by the Free Software Foundation.               --
  25 --                                                                          --
  26 -- You should have received a copy of the GNU General Public License and    --
  27 -- a copy of the GCC Runtime Library Exception along with this program;     --
  28 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  29 -- <http://www.gnu.org/licenses/>.                                          --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with Ada.Finalization;
  37 with System.Storage_Elements;
  38
  39 package System.Storage_Pools is
  40    pragma Preelaborate;
  41
  42    type Root_Storage_Pool is abstract
  43      new Ada.Finalization.Limited_Controlled with private;
  44    pragma Preelaborable_Initialization (Root_Storage_Pool);
  45
  46    procedure Allocate
  47      (Pool                     : in out Root_Storage_Pool;
  48       Storage_Address          : out System.Address;
  49       Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
  50       Alignment                : System.Storage_Elements.Storage_Count)
  51    is abstract;
  52
  53    procedure Deallocate
  54      (Pool                     : in out Root_Storage_Pool;
  55       Storage_Address          : System.Address;
  56       Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
  57       Alignment                : System.Storage_Elements.Storage_Count)
  58    is abstract;
  59
  60    function Storage_Size
  61      (Pool : Root_Storage_Pool)
  62       return System.Storage_Elements.Storage_Count
  63    is abstract;
  64
  65 private
  66    type Root_Storage_Pool is abstract
  67      new Ada.Finalization.Limited_Controlled with null record;
  68
  69    type Root_Storage_Pool_Ptr is access all Root_Storage_Pool'Class;
  70    for Root_Storage_Pool_Ptr'Storage_Size use 0;
  71    --  Type of the BIP_Storage_Pool extra parameter (see Exp_Ch6). The
  72    --  Storage_Size clause is necessary, because otherwise we have a
  73    --  chicken&egg problem; we can't be creating collection finalization code
  74    --  in this low-level package, because that involves Pool_Global, which
  75    --  imports this package.
  76
  77    --  ??? Are these two still needed? It might be possible to use Subpools.
  78    --  Allocate_Any_Controlled / Deallocate_Any_Controlled for non-controlled
  79    --  objects.
  80
  81    --  The following two procedures support the use of class-wide pool
  82    --  objects in storage pools. When a local type is given a class-wide
  83    --  storage pool, allocation and deallocation for the type must dispatch
  84    --  to the operation of the specific pool, which is achieved by a call
  85    --  to these procedures. (When the pool type is specific, the back-end
  86    --  generates a call to the statically identified operation of the type).
  87
  88    procedure Allocate_Any
  89     (Pool                     : in out Root_Storage_Pool'Class;
  90      Storage_Address          : out System.Address;
  91      Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
  92      Alignment                : System.Storage_Elements.Storage_Count);
  93
  94    procedure Deallocate_Any
  95     (Pool                     : in out Root_Storage_Pool'Class;
  96      Storage_Address          : System.Address;
  97      Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
  98      Alignment                : System.Storage_Elements.Storage_Count);
  99
 100 end System.Storage_Pools;