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5fa09df4 | 1 | /* Cygwin host-specific hook definitions. |
a5544970 | 2 | Copyright (C) 2004-2019 Free Software Foundation, Inc. |
5fa09df4 EC |
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 | |
2f83c7d6 | 8 | by the Free Software Foundation; either version 3, or (at your |
5fa09df4 EC |
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 | |
2f83c7d6 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
5fa09df4 | 19 | |
8fcc61f8 RS |
20 | #define IN_TARGET_CODE 1 |
21 | ||
5fa09df4 EC |
22 | #include "config.h" |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
e11c4407 | 25 | #include "diagnostic.h" |
5fa09df4 EC |
26 | #include "hosthooks.h" |
27 | #include "hosthooks-def.h" | |
5fa09df4 EC |
28 | |
29 | static void * cygwin_gt_pch_get_address (size_t, int fd); | |
30 | static size_t cygwin_gt_pch_alloc_granularity (void); | |
31 | ||
32 | #undef HOST_HOOKS_GT_PCH_GET_ADDRESS | |
33 | #define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address | |
34 | #undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY | |
35 | #define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity | |
36 | ||
37 | /* Granularity for reserving address space. */ | |
38 | static const size_t va_granularity = 0x10000; | |
39 | ||
40 | /* Return the alignment required for allocating virtual memory. */ | |
41 | static size_t | |
42 | cygwin_gt_pch_alloc_granularity (void) | |
43 | { | |
44 | return va_granularity; | |
45 | } | |
46 | ||
47 | /* Identify an address that's likely to be free in a subsequent invocation | |
48 | of the compiler. The area should be able to hold SIZE bytes. FD is an | |
49 | open file descriptor if the host would like to probe with mmap. */ | |
50 | static void * | |
51 | cygwin_gt_pch_get_address (size_t sz, int fd) | |
52 | { | |
53 | void *base; | |
54 | off_t p = lseek(fd, 0, SEEK_CUR); | |
55 | ||
56 | if (p == (off_t) -1) | |
40fecdd6 | 57 | fatal_error (input_location, "can%'t get position in PCH file: %m"); |
5fa09df4 EC |
58 | |
59 | /* Cygwin requires that the underlying file be at least | |
60 | as large as the requested mapping. */ | |
61 | if ((size_t) p < sz) | |
62 | { | |
63 | if ( ftruncate (fd, sz) == -1 ) | |
40fecdd6 | 64 | fatal_error (input_location, "can%'t extend PCH file: %m"); |
5fa09df4 EC |
65 | } |
66 | ||
67 | base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); | |
68 | ||
69 | if (base == MAP_FAILED) | |
70 | base = NULL; | |
71 | else | |
72 | munmap (base, sz); | |
73 | ||
74 | if (lseek (fd, p, SEEK_SET) == (off_t) -1 ) | |
40fecdd6 | 75 | fatal_error (input_location, "can%'t set position in PCH file: %m"); |
5fa09df4 EC |
76 | |
77 | return base; | |
78 | } | |
79 | ||
80 | const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |