gcc/ada/s-pooglo.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                   S Y S T E M . P O O L _ G L O B A L                    --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2001, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with System.Storage_Pools;    use System.Storage_Pools;
  35 with System.Storage_Elements;
  36 with System.Memory;
  37
  38 package body System.Pool_Global is
  39
  40    package SSE renames System.Storage_Elements;
  41
  42    --------------
  43    -- Allocate --
  44    --------------
  45
  46    procedure Allocate
  47      (Pool         : in out Unbounded_No_Reclaim_Pool;
  48       Address      : out System.Address;
  49       Storage_Size : SSE.Storage_Count;
  50       Alignment    : SSE.Storage_Count)
  51    is
  52       pragma Warnings (Off, Pool);
  53       pragma Warnings (Off, Alignment);
  54
  55       Allocated : System.Address;
  56
  57    begin
  58       Allocated := Memory.Alloc (Memory.size_t (Storage_Size));
  59
  60       --  The call to Alloc returns an address whose alignment is compatible
  61       --  with the worst case alignment requirement for the machine; thus the
  62       --  Alignment argument can be safely ignored.
  63
  64       if Allocated = Null_Address then
  65          raise Storage_Error;
  66       else
  67          Address := Allocated;
  68       end if;
  69    end Allocate;
  70
  71    ----------------
  72    -- Deallocate --
  73    ----------------
  74
  75    procedure Deallocate
  76      (Pool         : in out Unbounded_No_Reclaim_Pool;
  77       Address      : System.Address;
  78       Storage_Size : SSE.Storage_Count;
  79       Alignment    : SSE.Storage_Count)
  80    is
  81       pragma Warnings (Off, Pool);
  82       pragma Warnings (Off, Storage_Size);
  83       pragma Warnings (Off, Alignment);
  84
  85    begin
  86       Memory.Free (Address);
  87    end Deallocate;
  88
  89    ------------------
  90    -- Storage_Size --
  91    ------------------
  92
  93    function Storage_Size
  94      (Pool  : Unbounded_No_Reclaim_Pool)
  95       return  SSE.Storage_Count
  96    is
  97       pragma Warnings (Off, Pool);
  98
  99    begin
 100       --  Intuitively, should return System.Memory_Size. But on Sun/Alsys,
 101       --  System.Memory_Size > System.Max_Int, which means all you can do with
 102       --  it is raise CONSTRAINT_ERROR...
 103
 104       return SSE.Storage_Count'Last;
 105    end Storage_Size;
 106
 107 end System.Pool_Global;