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 --                                                                          --
  10 --          Copyright (C) 1992-2001, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with System.Storage_Pools;    use System.Storage_Pools;
  36 with System.Storage_Elements;
  37 with System.Memory;
  38
  39 package body System.Pool_Global is
  40
  41    package SSE renames System.Storage_Elements;
  42
  43    --------------
  44    -- Allocate --
  45    --------------
  46
  47    procedure Allocate
  48      (Pool         : in out Unbounded_No_Reclaim_Pool;
  49       Address      : out System.Address;
  50       Storage_Size : SSE.Storage_Count;
  51       Alignment    : SSE.Storage_Count)
  52    is
  53       pragma Warnings (Off, Pool);
  54       pragma Warnings (Off, Alignment);
  55
  56       Allocated : System.Address;
  57
  58    begin
  59       Allocated := Memory.Alloc (Memory.size_t (Storage_Size));
  60
  61       --  The call to Alloc returns an address whose alignment is compatible
  62       --  with the worst case alignment requirement for the machine; thus the
  63       --  Alignment argument can be safely ignored.
  64
  65       if Allocated = Null_Address then
  66          raise Storage_Error;
  67       else
  68          Address := Allocated;
  69       end if;
  70    end Allocate;
  71
  72    ----------------
  73    -- Deallocate --
  74    ----------------
  75
  76    procedure Deallocate
  77      (Pool         : in out Unbounded_No_Reclaim_Pool;
  78       Address      : System.Address;
  79       Storage_Size : SSE.Storage_Count;
  80       Alignment    : SSE.Storage_Count)
  81    is
  82       pragma Warnings (Off, Pool);
  83       pragma Warnings (Off, Storage_Size);
  84       pragma Warnings (Off, Alignment);
  85
  86    begin
  87       Memory.Free (Address);
  88    end Deallocate;
  89
  90    ------------------
  91    -- Storage_Size --
  92    ------------------
  93
  94    function Storage_Size
  95      (Pool  : Unbounded_No_Reclaim_Pool)
  96       return  SSE.Storage_Count
  97    is
  98       pragma Warnings (Off, Pool);
  99
 100    begin
 101       --  Intuitively, should return System.Memory_Size. But on Sun/Alsys,
 102       --  System.Memory_Size > System.Max_Int, which means all you can do with
 103       --  it is raise CONSTRAINT_ERROR...
 104
 105       return SSE.Storage_Count'Last;
 106    end Storage_Size;
 107
 108 end System.Pool_Global;