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/* Darwin host-specific hook definitions.
Copyright (C) 2003-2017 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 "diagnostic-core.h"
#include "config/host-darwin.h"
/* Yes, this is really supposed to work. */
static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
/* Return the address of the PCH address space, if the PCH will fit in it. */
void *
darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED)
{
if (sz <= sizeof (pch_address_space))
return pch_address_space;
else
return NULL;
}
/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
pch_address_space beyond SZ. */
int
darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off)
{
const size_t pagesize = getpagesize();
void *mmap_result;
int ret;
gcc_assert ((size_t)pch_address_space % pagesize == 0
&& sizeof (pch_address_space) % pagesize == 0);
ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
if (! ret)
sz = 0;
/* Round the size to a whole page size. Normally this is a no-op. */
sz = (sz + pagesize - 1) / pagesize * pagesize;
if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
fatal_error (input_location, "couldn%'t unmap pch_address_space: %m");
if (ret)
{
mmap_result = mmap (addr, sz,
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
fd, off);
/* The file might not be mmap-able. */
ret = mmap_result != (void *) MAP_FAILED;
/* Sanity check for broken MAP_FIXED. */
gcc_assert (!ret || mmap_result == addr);
}
return ret;
}
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