157 lines
5.8 KiB
Ada
157 lines
5.8 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- 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;
|