82 lines
2.5 KiB
C
Executable File
82 lines
2.5 KiB
C
Executable File
/* Cygwin host-specific hook definitions.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the
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Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include <sys/mman.h>
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#include "hosthooks.h"
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#include "hosthooks-def.h"
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#include "toplev.h"
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#include "diagnostic.h"
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static void * cygwin_gt_pch_get_address (size_t, int fd);
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static size_t cygwin_gt_pch_alloc_granularity (void);
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#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
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#define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address
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#undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
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#define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity
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/* Granularity for reserving address space. */
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static const size_t va_granularity = 0x10000;
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/* Return the alignment required for allocating virtual memory. */
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static size_t
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cygwin_gt_pch_alloc_granularity (void)
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{
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return va_granularity;
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}
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/* Identify an address that's likely to be free in a subsequent invocation
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of the compiler. The area should be able to hold SIZE bytes. FD is an
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open file descriptor if the host would like to probe with mmap. */
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static void *
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cygwin_gt_pch_get_address (size_t sz, int fd)
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{
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void *base;
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off_t p = lseek(fd, 0, SEEK_CUR);
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if (p == (off_t) -1)
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fatal_error ("can't get position in PCH file: %m");
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/* Cygwin requires that the underlying file be at least
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as large as the requested mapping. */
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if ((size_t) p < sz)
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{
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if ( ftruncate (fd, sz) == -1 )
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fatal_error ("can't extend PCH file: %m");
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}
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base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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if (base == MAP_FAILED)
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base = NULL;
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else
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munmap (base, sz);
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if (lseek (fd, p, SEEK_SET) == (off_t) -1 )
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fatal_error ("can't set position in PCH file: %m");
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return base;
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}
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const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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