1 /* Darwin host-specific hook definitions. 2 Copyright (C) 2003-2020 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published 8 by the Free Software Foundation; either version 3, or (at your 9 option) any later version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 #include "system.h" 22 #include "coretypes.h" 23 #include "diagnostic-core.h" 24 #include "config/host-darwin.h" 25 #include "hosthooks.h" 26 #include "hosthooks-def.h" 27 28 /* Yes, this is really supposed to work. */ 29 /* This allows for a pagesize of 16384, which we have on Darwin20, but should 30 continue to work OK for pagesize 4096 which we have on earlier versions. 31 The size is 1 (binary) Gb. */ 32 static char pch_address_space[65536*16384] __attribute__((aligned (16384))); 33 34 /* Return the address of the PCH address space, if the PCH will fit in it. */ 35 36 void * 37 darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED) 38 { 39 if (sz <= sizeof (pch_address_space)) 40 return pch_address_space; 41 else 42 return NULL; 43 } 44 45 /* Check ADDR and SZ for validity, and deallocate (using munmap) that part of 46 pch_address_space beyond SZ. */ 47 48 int 49 darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off) 50 { 51 const size_t pagesize = getpagesize(); 52 void *mmap_result; 53 int ret; 54 55 gcc_assert ((size_t)pch_address_space % pagesize == 0 56 && sizeof (pch_address_space) % pagesize == 0); 57 58 ret = (addr == pch_address_space && sz <= sizeof (pch_address_space)); 59 if (! ret) 60 sz = 0; 61 62 /* Round the size to a whole page size. Normally this is a no-op. */ 63 sz = (sz + pagesize - 1) / pagesize * pagesize; 64 65 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0) 66 fatal_error (input_location, "couldn%'t unmap pch_address_space: %m"); 67 68 if (ret) 69 { 70 mmap_result = mmap (addr, sz, 71 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, 72 fd, off); 73 74 /* The file might not be mmap-able. */ 75 ret = mmap_result != (void *) MAP_FAILED; 76 77 /* Sanity check for broken MAP_FIXED. */ 78 gcc_assert (!ret || mmap_result == addr); 79 } 80 81 return ret; 82 } 83 84 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; 85