Imported gcc-4.4.3

[msp430-gcc.git] / gcc / config / i386 / host-cygwin.c

diff --git a/gcc/config/i386/host-cygwin.c b/gcc/config/i386/host-cygwin.c
new file mode 100644 (file)
index 0000000..1f831a6
--- /dev/null
+++ b/gcc/config/i386/host-cygwin.c
@@ -0,0 +1,80 @@
+/* Cygwin host-specific hook definitions.
+ Copyright (C) 2004, 2007 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 <sys/mman.h>
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+#include "toplev.h"
+#include "diagnostic.h"
+
+static void * cygwin_gt_pch_get_address (size_t, int fd);
+static size_t cygwin_gt_pch_alloc_granularity (void);
+
+#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
+#define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address
+#undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
+#define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity
+
+/* Granularity for reserving address space.  */
+static const size_t va_granularity = 0x10000;
+
+/*  Return the alignment required for allocating virtual memory. */
+static size_t
+cygwin_gt_pch_alloc_granularity (void)
+{
+  return va_granularity;
+}
+
+/* Identify an address that's likely to be free in a subsequent invocation
+   of the compiler.  The area should be able to hold SIZE bytes.  FD is an
+   open file descriptor if the host would like to probe with mmap.  */
+static void *
+cygwin_gt_pch_get_address (size_t sz, int fd)
+{
+  void *base;
+  off_t p = lseek(fd, 0, SEEK_CUR);
+
+  if (p == (off_t) -1)
+    fatal_error ("can't get position in PCH file: %m");
+
+   /* Cygwin requires that the underlying file be at least
+      as large as the requested mapping.  */
+  if ((size_t) p < sz)
+  { 
+    if ( ftruncate (fd, sz) == -1 )
+      fatal_error ("can't extend PCH file: %m");
+  }
+
+  base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+  if (base == MAP_FAILED)
+    base = NULL;
+  else
+    munmap (base, sz);
+
+  if (lseek (fd, p, SEEK_SET) == (off_t) -1 )
+    fatal_error ("can't set position in PCH file: %m");
+
+  return base;
+}
+
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;