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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [gcc/] [config/] [host-darwin.c] - Rev 20
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/* Darwin host-specific hook definitions. Copyright (C) 2003, 2004, 2005 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 2, 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 COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include "system.h" #include "coretypes.h" #include <sys/mman.h> #include "toplev.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 ("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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