1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . P O O L _ G L O B A L --
9 -- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 with System.Storage_Pools; use System.Storage_Pools;
35 package body System.Pool_Global is
37 package SSE renames System.Storage_Elements;
43 overriding procedure Allocate
44 (Pool : in out Unbounded_No_Reclaim_Pool;
45 Address : out System.Address;
46 Storage_Size : SSE.Storage_Count;
47 Alignment : SSE.Storage_Count)
50 pragma Warnings (Off, Pool);
52 Aligned_Size : Storage_Count := Storage_Size;
53 Aligned_Address : System.Address;
54 Allocated : System.Address;
57 if Alignment > Standard'System_Allocator_Alignment then
58 Aligned_Size := Aligned_Size + Alignment;
61 Allocated := Memory.Alloc (Memory.size_t (Aligned_Size));
63 -- The call to Alloc returns an address whose alignment is compatible
64 -- with the worst case alignment requirement for the machine; thus the
65 -- Alignment argument can be safely ignored.
67 if Allocated = Null_Address then
71 -- Case where alignment requested is greater than the alignment that is
72 -- guaranteed to be provided by the system allocator.
74 if Alignment > Standard'System_Allocator_Alignment then
76 -- Realign the returned address
78 Aligned_Address := To_Address
79 (To_Integer (Allocated) + Integer_Address (Alignment)
80 - (To_Integer (Allocated) mod Integer_Address (Alignment)));
82 -- Save the block address
85 Saved_Address : System.Address;
86 pragma Import (Ada, Saved_Address);
87 for Saved_Address'Address use
89 - Storage_Offset (System.Address'Size / Storage_Unit);
91 Saved_Address := Allocated;
94 Address := Aligned_Address;
105 overriding procedure Deallocate
106 (Pool : in out Unbounded_No_Reclaim_Pool;
107 Address : System.Address;
108 Storage_Size : SSE.Storage_Count;
109 Alignment : SSE.Storage_Count)
111 use System.Storage_Elements;
112 pragma Warnings (Off, Pool);
113 pragma Warnings (Off, Storage_Size);
116 -- Case where the alignment of the block exceeds the guaranteed
117 -- alignment required by the system storage allocator, meaning that
118 -- this was specially wrapped at allocation time.
120 if Alignment > Standard'System_Allocator_Alignment then
122 -- Retrieve the block address
125 Saved_Address : System.Address;
126 pragma Import (Ada, Saved_Address);
127 for Saved_Address'Address use
128 Address - Storage_Offset (System.Address'Size / Storage_Unit);
130 Memory.Free (Saved_Address);
134 Memory.Free (Address);
142 overriding function Storage_Size
143 (Pool : Unbounded_No_Reclaim_Pool)
144 return SSE.Storage_Count
146 pragma Warnings (Off, Pool);
149 -- Intuitively, should return System.Memory_Size. But on Sun/Alsys,
150 -- System.Memory_Size > System.Max_Int, which means all you can do with
151 -- it is raise CONSTRAINT_ERROR...
153 return SSE.Storage_Count'Last;
156 end System.Pool_Global;