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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [i386/] [host-cygwin.c] - Blame information for rev 282

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1 282 jeremybenn
/* Cygwin host-specific hook definitions.
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 Copyright (C) 2004, 2007 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 3, 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 COPYING3.  If not see
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 <http://www.gnu.org/licenses/>. */
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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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