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/* Cygwin host-specific hook definitions.

 Copyright (C) 2004, 2007 Free Software Foundation, Inc.

 This file is part of GCC.

 GCC is free software; you can redistribute it and/or modify it

 under the terms of the GNU General Public License as published

 by the Free Software Foundation; either version 3, or (at your

 option) any later version.

 GCC is distributed in the hope that it will be useful, but WITHOUT

 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public

 License for more details.

 You should have received a copy of the GNU General Public License

 along with GCC; see the file COPYING3.  If not see

 <http://www.gnu.org/licenses/>. */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include <sys/mman.h>

#include "hosthooks.h"

#include "hosthooks-def.h"

#include "toplev.h"

#include "diagnostic.h"

static void * cygwin_gt_pch_get_address (size_t, int fd);

static size_t cygwin_gt_pch_alloc_granularity (void);

#undef HOST_HOOKS_GT_PCH_GET_ADDRESS

#define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address

#undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY

#define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity

/* Granularity for reserving address space.  */

static const size_t va_granularity = 0x10000;

/*  Return the alignment required for allocating virtual memory. */

static size_t

cygwin_gt_pch_alloc_granularity (void)

{

  return va_granularity;

}

/* Identify an address that's likely to be free in a subsequent invocation

   of the compiler.  The area should be able to hold SIZE bytes.  FD is an

   open file descriptor if the host would like to probe with mmap.  */

static void *

cygwin_gt_pch_get_address (size_t sz, int fd)

{

  void *base;

  off_t p = lseek(fd, 0, SEEK_CUR);

  if (p == (off_t) -1)

    fatal_error ("can't get position in PCH file: %m");

   /* Cygwin requires that the underlying file be at least

      as large as the requested mapping.  */

  if ((size_t) p < sz)

  {

    if ( ftruncate (fd, sz) == -1 )

      fatal_error ("can't extend PCH file: %m");

  }

  base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);

  if (base == MAP_FAILED)

    base = NULL;

  else

    munmap (base, sz);

  if (lseek (fd, p, SEEK_SET) == (off_t) -1 )

    fatal_error ("can't set position in PCH file: %m");

  return base;

}

const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;