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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [i386/] [host-cygwin.c] - Rev 332
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/* 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;
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