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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/config/host-darwin.c
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Diffstat (limited to 'gcc/config/host-darwin.c')
-rw-r--r--gcc/config/host-darwin.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/gcc/config/host-darwin.c b/gcc/config/host-darwin.c
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+++ b/gcc/config/host-darwin.c
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+/* Darwin host-specific hook definitions.
+ Copyright (C) 2003, 2004, 2005, 2007, 2010 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 ("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;
+}