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 --                            $Revision: 1.9 $
  10 --                                                                          --
  11 --          Copyright (C) 1992-2001, Free Software Foundation, Inc.         --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System.Storage_Pools;    use System.Storage_Pools;
  37 with System.Storage_Elements;
  38 with System.Memory;
  39
  40 package body System.Pool_Global is
  41
  42    package SSE renames System.Storage_Elements;
  43
  44    --------------
  45    -- Allocate --
  46    --------------
  47
  48    procedure Allocate
  49      (Pool         : in out Unbounded_No_Reclaim_Pool;
  50       Address      : out System.Address;
  51       Storage_Size : SSE.Storage_Count;
  52       Alignment    : SSE.Storage_Count)
  53    is
  54       Allocated : System.Address;
  55    begin
  56       Allocated := Memory.Alloc (Memory.size_t (Storage_Size));
  57
  58       --  The call to Alloc returns an address whose alignment is compatible
  59       --  with the worst case alignment requirement for the machine; thus the
  60       --  Alignment argument can be safely ignored.
  61
  62       if Allocated = Null_Address then
  63          raise Storage_Error;
  64       else
  65          Address := Allocated;
  66       end if;
  67    end Allocate;
  68
  69    ----------------
  70    -- Deallocate --
  71    ----------------
  72
  73    procedure Deallocate
  74      (Pool         : in out Unbounded_No_Reclaim_Pool;
  75       Address      : System.Address;
  76       Storage_Size : SSE.Storage_Count;
  77       Alignment    : SSE.Storage_Count) is
  78    begin
  79       Memory.Free (Address);
  80    end Deallocate;
  81
  82    ------------------
  83    -- Storage_Size --
  84    ------------------
  85
  86    function Storage_Size
  87      (Pool  : Unbounded_No_Reclaim_Pool)
  88       return  SSE.Storage_Count
  89    is
  90    begin
  91       --  Intuitively, should return System.Memory_Size. But on Sun/Alsys,
  92       --  System.Memory_Size > System.Max_Int, which means all you can do with
  93       --  it is raise CONSTRAINT_ERROR...
  94
  95       return SSE.Storage_Count'Last;
  96    end Storage_Size;
  97
  98 end System.Pool_Global;