|
111
|
1 ------------------------------------------------------------------------------
|
|
|
2 -- --
|
|
|
3 -- GNAT COMPILER COMPONENTS --
|
|
|
4 -- --
|
|
|
5 -- S Y S T E M . P O O L _ G L O B A L --
|
|
|
6 -- --
|
|
|
7 -- B o d y --
|
|
|
8 -- --
|
|
131
|
9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
|
|
111
|
10 -- --
|
|
|
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. --
|
|
|
17 -- --
|
|
|
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. --
|
|
|
21 -- --
|
|
|
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/>. --
|
|
|
26 -- --
|
|
|
27 -- GNAT was originally developed by the GNAT team at New York University. --
|
|
|
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
|
|
|
29 -- --
|
|
|
30 ------------------------------------------------------------------------------
|
|
|
31
|
|
|
32 with System.Storage_Pools; use System.Storage_Pools;
|
|
|
33 with System.Memory;
|
|
|
34
|
|
|
35 package body System.Pool_Global is
|
|
|
36
|
|
|
37 package SSE renames System.Storage_Elements;
|
|
|
38
|
|
|
39 --------------
|
|
|
40 -- Allocate --
|
|
|
41 --------------
|
|
|
42
|
|
|
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)
|
|
|
48 is
|
|
|
49 use SSE;
|
|
|
50 pragma Warnings (Off, Pool);
|
|
|
51
|
|
|
52 Aligned_Size : Storage_Count := Storage_Size;
|
|
|
53 Aligned_Address : System.Address;
|
|
|
54 Allocated : System.Address;
|
|
|
55
|
|
|
56 begin
|
|
|
57 if Alignment > Standard'System_Allocator_Alignment then
|
|
|
58 Aligned_Size := Aligned_Size + Alignment;
|
|
|
59 end if;
|
|
|
60
|
|
|
61 Allocated := Memory.Alloc (Memory.size_t (Aligned_Size));
|
|
|
62
|
|
|
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.
|
|
|
66
|
|
|
67 if Allocated = Null_Address then
|
|
|
68 raise Storage_Error;
|
|
|
69 end if;
|
|
|
70
|
|
|
71 -- Case where alignment requested is greater than the alignment that is
|
|
|
72 -- guaranteed to be provided by the system allocator.
|
|
|
73
|
|
|
74 if Alignment > Standard'System_Allocator_Alignment then
|
|
|
75
|
|
|
76 -- Realign the returned address
|
|
|
77
|
|
|
78 Aligned_Address := To_Address
|
|
|
79 (To_Integer (Allocated) + Integer_Address (Alignment)
|
|
|
80 - (To_Integer (Allocated) mod Integer_Address (Alignment)));
|
|
|
81
|
|
|
82 -- Save the block address
|
|
|
83
|
|
|
84 declare
|
|
|
85 Saved_Address : System.Address;
|
|
|
86 pragma Import (Ada, Saved_Address);
|
|
|
87 for Saved_Address'Address use
|
|
|
88 Aligned_Address
|
|
|
89 - Storage_Offset (System.Address'Size / Storage_Unit);
|
|
|
90 begin
|
|
|
91 Saved_Address := Allocated;
|
|
|
92 end;
|
|
|
93
|
|
|
94 Address := Aligned_Address;
|
|
|
95
|
|
|
96 else
|
|
|
97 Address := Allocated;
|
|
|
98 end if;
|
|
|
99 end Allocate;
|
|
|
100
|
|
|
101 ----------------
|
|
|
102 -- Deallocate --
|
|
|
103 ----------------
|
|
|
104
|
|
|
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)
|
|
|
110 is
|
|
|
111 use System.Storage_Elements;
|
|
|
112 pragma Warnings (Off, Pool);
|
|
|
113 pragma Warnings (Off, Storage_Size);
|
|
|
114
|
|
|
115 begin
|
|
|
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.
|
|
|
119
|
|
|
120 if Alignment > Standard'System_Allocator_Alignment then
|
|
|
121
|
|
|
122 -- Retrieve the block address
|
|
|
123
|
|
|
124 declare
|
|
|
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);
|
|
|
129 begin
|
|
|
130 Memory.Free (Saved_Address);
|
|
|
131 end;
|
|
|
132
|
|
|
133 else
|
|
|
134 Memory.Free (Address);
|
|
|
135 end if;
|
|
|
136 end Deallocate;
|
|
|
137
|
|
|
138 ------------------
|
|
|
139 -- Storage_Size --
|
|
|
140 ------------------
|
|
|
141
|
|
|
142 overriding function Storage_Size
|
|
|
143 (Pool : Unbounded_No_Reclaim_Pool)
|
|
|
144 return SSE.Storage_Count
|
|
|
145 is
|
|
|
146 pragma Warnings (Off, Pool);
|
|
|
147
|
|
|
148 begin
|
|
|
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...
|
|
|
152
|
|
|
153 return SSE.Storage_Count'Last;
|
|
|
154 end Storage_Size;
|
|
|
155
|
|
|
156 end System.Pool_Global;
|
