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

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1 282 jeremybenn
/* Darwin host-specific hook definitions.
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   Copyright (C) 2003, 2004, 2005, 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 "toplev.h"
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#include "config/host-darwin.h"
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/* Yes, this is really supposed to work.  */
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static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
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/* Return the address of the PCH address space, if the PCH will fit in it.  */
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void *
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darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED)
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{
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  if (sz <= sizeof (pch_address_space))
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    return pch_address_space;
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  else
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    return NULL;
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}
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/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
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   pch_address_space beyond SZ.  */
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int
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darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off)
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{
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  const size_t pagesize = getpagesize();
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  void *mmap_result;
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  int ret;
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  gcc_assert ((size_t)pch_address_space % pagesize == 0
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              && sizeof (pch_address_space) % pagesize == 0);
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  ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
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  if (! ret)
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    sz = 0;
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  /* Round the size to a whole page size.  Normally this is a no-op.  */
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  sz = (sz + pagesize - 1) / pagesize * pagesize;
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  if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
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    fatal_error ("couldn't unmap pch_address_space: %m");
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  if (ret)
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    {
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      mmap_result = mmap (addr, sz,
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                          PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
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                          fd, off);
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      /* The file might not be mmap-able.  */
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      ret = mmap_result != (void *) MAP_FAILED;
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      /* Sanity check for broken MAP_FIXED.  */
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      gcc_assert (!ret || mmap_result == addr);
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    }
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  return ret;
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}

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