/* Darwin host-specific hook definitions.
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/* Darwin host-specific hook definitions.
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Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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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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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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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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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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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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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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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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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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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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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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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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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "config.h"
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#include "system.h"
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#include "system.h"
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#include "coretypes.h"
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#include "coretypes.h"
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#include <sys/mman.h>
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#include <sys/mman.h>
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#include "toplev.h"
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#include "toplev.h"
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#include "config/host-darwin.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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/* 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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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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/* Return the address of the PCH address space, if the PCH will fit in it. */
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void *
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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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darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED)
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{
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{
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if (sz <= sizeof (pch_address_space))
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if (sz <= sizeof (pch_address_space))
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return pch_address_space;
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return pch_address_space;
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else
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else
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return NULL;
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return NULL;
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}
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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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/* 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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pch_address_space beyond SZ. */
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int
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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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darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off)
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{
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{
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const size_t pagesize = getpagesize();
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const size_t pagesize = getpagesize();
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void *mmap_result;
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void *mmap_result;
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int ret;
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int ret;
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gcc_assert ((size_t)pch_address_space % pagesize == 0
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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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&& sizeof (pch_address_space) % pagesize == 0);
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ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
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ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
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if (! ret)
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if (! ret)
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sz = 0;
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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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/* 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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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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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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fatal_error ("couldn't unmap pch_address_space: %m");
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if (ret)
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if (ret)
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{
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{
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mmap_result = mmap (addr, sz,
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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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PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
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fd, off);
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fd, off);
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/* The file might not be mmap-able. */
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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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ret = mmap_result != (void *) MAP_FAILED;
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/* Sanity check for broken MAP_FIXED. */
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/* Sanity check for broken MAP_FIXED. */
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gcc_assert (!ret || mmap_result == addr);
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gcc_assert (!ret || mmap_result == addr);
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}
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}
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return ret;
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return ret;
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}
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}
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