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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . P O O L _ G L O B A L --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2011, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with System.Storage_Pools; use System.Storage_Pools;
with System.Memory;
package body System.Pool_Global is
package SSE renames System.Storage_Elements;
--------------
-- Allocate --
--------------
overriding procedure Allocate
(Pool : in out Unbounded_No_Reclaim_Pool;
Address : out System.Address;
Storage_Size : SSE.Storage_Count;
Alignment : SSE.Storage_Count)
is
use SSE;
pragma Warnings (Off, Pool);
Aligned_Size : Storage_Count := Storage_Size;
Aligned_Address : System.Address;
Allocated : System.Address;
begin
if Alignment > Standard'System_Allocator_Alignment then
Aligned_Size := Aligned_Size + Alignment;
end if;
Allocated := Memory.Alloc (Memory.size_t (Aligned_Size));
-- 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;
end if;
-- Case where alignment requested is greater than the alignment that is
-- guaranteed to be provided by the system allocator.
if Alignment > Standard'System_Allocator_Alignment then
-- Realign the returned address
Aligned_Address := To_Address
(To_Integer (Allocated) + Integer_Address (Alignment)
- (To_Integer (Allocated) mod Integer_Address (Alignment)));
-- Save the block address
declare
Saved_Address : System.Address;
pragma Import (Ada, Saved_Address);
for Saved_Address'Address use
Aligned_Address
- Storage_Offset (System.Address'Size / Storage_Unit);
begin
Saved_Address := Allocated;
end;
Address := Aligned_Address;
else
Address := Allocated;
end if;
end Allocate;
----------------
-- Deallocate --
----------------
overriding procedure Deallocate
(Pool : in out Unbounded_No_Reclaim_Pool;
Address : System.Address;
Storage_Size : SSE.Storage_Count;
Alignment : SSE.Storage_Count)
is
use System.Storage_Elements;
pragma Warnings (Off, Pool);
pragma Warnings (Off, Storage_Size);
begin
-- Case where the alignment of the block exceeds the guaranteed
-- alignment required by the system storage allocator, meaning that
-- this was specially wrapped at allocation time.
if Alignment > Standard'System_Allocator_Alignment then
-- Retrieve the block address
declare
Saved_Address : System.Address;
pragma Import (Ada, Saved_Address);
for Saved_Address'Address use
Address - Storage_Offset (System.Address'Size / Storage_Unit);
begin
Memory.Free (Saved_Address);
end;
else
Memory.Free (Address);
end if;
end Deallocate;
------------------
-- Storage_Size --
------------------
overriding function Storage_Size
(Pool : Unbounded_No_Reclaim_Pool)
return SSE.Storage_Count
is
pragma Warnings (Off, Pool);
begin
-- Intuitively, should return System.Memory_Size. But on Sun/Alsys,
-- System.Memory_Size > System.Max_Int, which means all you can do with
-- it is raise CONSTRAINT_ERROR...
return SSE.Storage_Count'Last;
end Storage_Size;
end System.Pool_Global;
|
