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1/* Cygwin host-specific hook definitions.
2 Copyright (C) 2004-2017 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
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.
10
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.
15
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/>. */
19
20#include "config.h"
21#include "system.h"
22#include "coretypes.h"
23#include "diagnostic.h"
24#include "hosthooks.h"
25#include "hosthooks-def.h"
26
27static void * cygwin_gt_pch_get_address (size_t, int fd);
28static size_t cygwin_gt_pch_alloc_granularity (void);
29
30#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
31#define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address
32#undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
33#define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity
34
35/* Granularity for reserving address space. */
36static const size_t va_granularity = 0x10000;
37
38/* Return the alignment required for allocating virtual memory. */
39static size_t
40cygwin_gt_pch_alloc_granularity (void)
41{
42 return va_granularity;
43}
44
45/* Identify an address that's likely to be free in a subsequent invocation
46 of the compiler. The area should be able to hold SIZE bytes. FD is an
47 open file descriptor if the host would like to probe with mmap. */
48static void *
49cygwin_gt_pch_get_address (size_t sz, int fd)
50{
51 void *base;
52 off_t p = lseek(fd, 0, SEEK_CUR);
53
54 if (p == (off_t) -1)
55 fatal_error (input_location, "can%'t get position in PCH file: %m");
56
57 /* Cygwin requires that the underlying file be at least
58 as large as the requested mapping. */
59 if ((size_t) p < sz)
60 {
61 if ( ftruncate (fd, sz) == -1 )
62 fatal_error (input_location, "can%'t extend PCH file: %m");
63 }
64
65 base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
66
67 if (base == MAP_FAILED)
68 base = NULL;
69 else
70 munmap (base, sz);
71
72 if (lseek (fd, p, SEEK_SET) == (off_t) -1 )
73 fatal_error (input_location, "can%'t set position in PCH file: %m");
74
75 return base;
76}
77
78const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
79

Warning: That file was not part of the compilation database. It may have many parsing errors.