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1 /* Cygwin host-specific hook definitions.
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2 Copyright (C) 2004, 2007 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published
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8 by the Free Software Foundation; either version 3, or (at your
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9 option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include <sys/mman.h>
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24 #include "hosthooks.h"
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25 #include "hosthooks-def.h"
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26 #include "toplev.h"
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27 #include "diagnostic.h"
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28
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29 static void * cygwin_gt_pch_get_address (size_t, int fd);
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30 static size_t cygwin_gt_pch_alloc_granularity (void);
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31
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32 #undef HOST_HOOKS_GT_PCH_GET_ADDRESS
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33 #define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address
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34 #undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
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35 #define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity
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36
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37 /* Granularity for reserving address space. */
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38 static const size_t va_granularity = 0x10000;
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39
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40 /* Return the alignment required for allocating virtual memory. */
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41 static size_t
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42 cygwin_gt_pch_alloc_granularity (void)
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43 {
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44 return va_granularity;
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45 }
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46
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47 /* Identify an address that's likely to be free in a subsequent invocation
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48 of the compiler. The area should be able to hold SIZE bytes. FD is an
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49 open file descriptor if the host would like to probe with mmap. */
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50 static void *
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51 cygwin_gt_pch_get_address (size_t sz, int fd)
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52 {
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53 void *base;
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54 off_t p = lseek(fd, 0, SEEK_CUR);
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55
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56 if (p == (off_t) -1)
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57 fatal_error ("can't get position in PCH file: %m");
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58
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59 /* Cygwin requires that the underlying file be at least
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60 as large as the requested mapping. */
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61 if ((size_t) p < sz)
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62 {
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63 if ( ftruncate (fd, sz) == -1 )
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64 fatal_error ("can't extend PCH file: %m");
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65 }
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66
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67 base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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68
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69 if (base == MAP_FAILED)
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70 base = NULL;
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71 else
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72 munmap (base, sz);
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73
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74 if (lseek (fd, p, SEEK_SET) == (off_t) -1 )
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75 fatal_error ("can't set position in PCH file: %m");
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76
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77 return base;
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78 }
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79
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80 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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