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c90973a7 | 1 | /* Cygwin host-specific hook definitions. |
f1717362 | 2 | Copyright (C) 2004-2016 Free Software Foundation, Inc. |
c90973a7 | 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 | |
038d1e19 | 8 | by the Free Software Foundation; either version 3, or (at your |
c90973a7 | 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 | |
038d1e19 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
c90973a7 | 19 | |
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
c1eb80de | 23 | #include "diagnostic.h" |
c90973a7 | 24 | #include "hosthooks.h" |
25 | #include "hosthooks-def.h" | |
c90973a7 | 26 | |
27 | static void * cygwin_gt_pch_get_address (size_t, int fd); | |
28 | static 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. */ | |
36 | static const size_t va_granularity = 0x10000; | |
37 | ||
38 | /* Return the alignment required for allocating virtual memory. */ | |
39 | static size_t | |
40 | cygwin_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. */ | |
48 | static void * | |
49 | cygwin_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) | |
c05be867 | 55 | fatal_error (input_location, "can%'t get position in PCH file: %m"); |
c90973a7 | 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 ) | |
c05be867 | 62 | fatal_error (input_location, "can%'t extend PCH file: %m"); |
c90973a7 | 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 ) | |
c05be867 | 73 | fatal_error (input_location, "can%'t set position in PCH file: %m"); |
c90973a7 | 74 | |
75 | return base; | |
76 | } | |
77 | ||
78 | const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |