| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2022, 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; |