+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . P O O L _ L O C A L --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with System.Memory;
-with System.Storage_Elements;
-with System.Address_To_Access_Conversions;
-
-package body System.Pool_Local is
-
- package SSE renames System.Storage_Elements;
- use type SSE.Storage_Offset;
-
- Pointer_Size : constant SSE.Storage_Offset := Address'Size / Storage_Unit;
- Pointers_Size : constant SSE.Storage_Offset := 2 * Pointer_Size;
-
- type Acc_Address is access all Address;
- package Addr is new Address_To_Access_Conversions (Address);
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- function Next (A : Address) return Acc_Address;
- -- Given an address of a block, return an access to the next block
-
- function Prev (A : Address) return Acc_Address;
- -- Given an address of a block, return an access to the previous block
-
- --------------
- -- Allocate --
- --------------
-
- procedure Allocate
- (Pool : in out Unbounded_Reclaim_Pool;
- Address : out System.Address;
- Storage_Size : SSE.Storage_Count;
- Alignment : SSE.Storage_Count)
- is
- Allocated : constant System.Address :=
- Memory.Alloc (Memory.size_t (Storage_Size + Pointers_Size));
-
- begin
- -- The call to Alloc returns an address whose alignment is compatible
- -- with the worst case alignment requirement for the machine; thus the
- -- Alignment argument can be safely ignored.
-
- if Allocated = Null_Address then
- raise Storage_Error;
- else
- Address := Allocated + Pointers_Size;
- Next (Allocated).all := Pool.First;
- Prev (Allocated).all := Null_Address;
-
- if Pool.First /= Null_Address then
- Prev (Pool.First).all := Allocated;
- end if;
-
- Pool.First := Allocated;
- end if;
- end Allocate;
-
- ----------------
- -- Deallocate --
- ----------------
-
- procedure Deallocate
- (Pool : in out Unbounded_Reclaim_Pool;
- Address : System.Address;
- Storage_Size : SSE.Storage_Count;
- Alignment : SSE.Storage_Count)
- is
- Allocated : constant System.Address := Address - Pointers_Size;
- begin
- if Prev (Allocated).all = Null_Address then
- Pool.First := Next (Allocated).all;
- Prev (Pool.First).all := Null_Address;
- else
- Next (Prev (Allocated).all).all := Next (Allocated).all;
- end if;
-
- if Next (Allocated).all /= Null_Address then
- Prev (Next (Allocated).all).all := Prev (Allocated).all;
- end if;
-
- Memory.Free (Allocated);
- end Deallocate;
-
- --------------
- -- Finalize --
- --------------
-
- procedure Finalize (Pool : in out Unbounded_Reclaim_Pool) is
- N : System.Address := Pool.First;
- Allocated : System.Address;
-
- begin
- while N /= Null_Address loop
- Allocated := N;
- N := Next (N).all;
- Memory.Free (Allocated);
- end loop;
- end Finalize;
-
- ----------
- -- Next --
- ----------
-
- function Next (A : Address) return Acc_Address is
- begin
- return Acc_Address (Addr.To_Pointer (A));
- end Next;
-
- ----------
- -- Prev --
- ----------
-
- function Prev (A : Address) return Acc_Address is
- begin
- return Acc_Address (Addr.To_Pointer (A + Pointer_Size));
- end Prev;
-
-end System.Pool_Local;
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