1 /* Darwin host-specific hook definitions.
2 Copyright (C) 2003-2019 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 3, or (at your
9 option) any later version.
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
23 #include "diagnostic-core.h"
24 #include "config/host-darwin.h"
26 /* Yes, this is really supposed to work. */
27 static char pch_address_space
[1024*1024*1024] __attribute__((aligned (4096)));
29 /* Return the address of the PCH address space, if the PCH will fit in it. */
32 darwin_gt_pch_get_address (size_t sz
, int fd ATTRIBUTE_UNUSED
)
34 if (sz
<= sizeof (pch_address_space
))
35 return pch_address_space
;
40 /* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
41 pch_address_space beyond SZ. */
44 darwin_gt_pch_use_address (void *addr
, size_t sz
, int fd
, size_t off
)
46 const size_t pagesize
= getpagesize();
50 gcc_assert ((size_t)pch_address_space
% pagesize
== 0
51 && sizeof (pch_address_space
) % pagesize
== 0);
53 ret
= (addr
== pch_address_space
&& sz
<= sizeof (pch_address_space
));
57 /* Round the size to a whole page size. Normally this is a no-op. */
58 sz
= (sz
+ pagesize
- 1) / pagesize
* pagesize
;
60 if (munmap (pch_address_space
+ sz
, sizeof (pch_address_space
) - sz
) != 0)
61 fatal_error (input_location
, "couldn%'t unmap pch_address_space: %m");
65 mmap_result
= mmap (addr
, sz
,
66 PROT_READ
| PROT_WRITE
, MAP_PRIVATE
| MAP_FIXED
,
69 /* The file might not be mmap-able. */
70 ret
= mmap_result
!= (void *) MAP_FAILED
;
72 /* Sanity check for broken MAP_FIXED. */
73 gcc_assert (!ret
|| mmap_result
== addr
);