gcc/config/i386/host-mingw32.c

   1 /* mingw32 host-specific hook definitions.
   2    Copyright (C) 2004-2017 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.h"
  24 #include "hosthooks.h"
  25 #include "hosthooks-def.h"
  26
  27
  28 #define WIN32_LEAN_AND_MEAN  /* Not so important if we have windows.h.gch.  */
  29 #include <windows.h>
  30 #include <stdlib.h>
  31
  32 static void * mingw32_gt_pch_get_address (size_t, int);
  33 static int mingw32_gt_pch_use_address (void *, size_t, int, size_t);
  34 static size_t mingw32_gt_pch_alloc_granularity (void);
  35
  36 #undef HOST_HOOKS_GT_PCH_GET_ADDRESS
  37 #define HOST_HOOKS_GT_PCH_GET_ADDRESS mingw32_gt_pch_get_address
  38 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
  39 #define HOST_HOOKS_GT_PCH_USE_ADDRESS mingw32_gt_pch_use_address
  40 #undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
  41 #define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY mingw32_gt_pch_alloc_granularity
  42
  43 static inline void w32_error(const char*, const char*, int, const char*);
  44
  45 /* FIXME: Is this big enough?  */
  46 static const size_t pch_VA_max_size  = 128 * 1024 * 1024;
  47
  48 /* Granularity for reserving address space.  */
  49 static size_t va_granularity = 0x10000;
  50
  51 /* Print out the GetLastError() translation.  */
  52 static inline void
  53 w32_error (const char* function, const char* file, int line,
  54            const char* my_msg)
  55 {
  56   LPSTR w32_msgbuf;
  57   FormatMessageA (FORMAT_MESSAGE_ALLOCATE_BUFFER
  58                   | FORMAT_MESSAGE_FROM_SYSTEM
  59                   | FORMAT_MESSAGE_IGNORE_INSERTS
  60                   | FORMAT_MESSAGE_MAX_WIDTH_MASK,
  61                   NULL, GetLastError(),
  62                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  63                   (LPSTR) &w32_msgbuf, 0, NULL);
  64   fprintf(stderr, "internal error in %s, at %s:%d: %s: %s\n",
  65           function, trim_filename (file), line, my_msg, w32_msgbuf);
  66   LocalFree ((HLOCAL)w32_msgbuf);
  67 }
  68
  69 /* Granularity for reserving address space.  */
  70 static size_t
  71 mingw32_gt_pch_alloc_granularity (void)
  72 {
  73   SYSTEM_INFO si;
  74
  75   GetSystemInfo (&si);
  76   va_granularity = (size_t) si.dwAllocationGranularity;
  77
  78   return va_granularity;
  79 }
  80
  81 /* Identify an address that's likely to be free in a subsequent invocation
  82    of the compiler.  The area should be able to hold SIZE bytes.  FD is an
  83    open file descriptor if the host would like to probe with mmap.  */
  84
  85 static void *
  86 mingw32_gt_pch_get_address (size_t size, int)
  87 {
  88   void* res;
  89   size = (size + va_granularity - 1) & ~(va_granularity - 1);
  90   if (size > pch_VA_max_size)
  91     return NULL;
  92
  93   /* FIXME: We let system determine base by setting first arg to NULL.
  94      Allocating at top of available address space avoids unnecessary
  95      fragmentation of "ordinary" (malloc's)  address space but may not
  96      be safe  with delayed load of system dll's. Preferred addresses
  97      for NT system dlls is in 0x70000000 to 0x78000000 range.
  98      If we allocate at bottom we need to reserve the address as early
  99      as possible and at the same point in each invocation. */
 100
 101   res = VirtualAlloc (NULL, pch_VA_max_size,
 102                       MEM_RESERVE | MEM_TOP_DOWN,
 103                       PAGE_NOACCESS);
 104   if (!res)
 105     w32_error (__FUNCTION__, __FILE__, __LINE__, "VirtualAlloc");
 106   else
 107     /* We do not need the address space for now, so free it.  */
 108     VirtualFree (res, 0, MEM_RELEASE);
 109
 110   return res;
 111 }
 112
 113 /* ADDR is an address returned by gt_pch_get_address.  Attempt to allocate
 114    SIZE bytes at the same address and load it with the data from FD at
 115    OFFSET.  Return -1 if we couldn't allocate memory at ADDR, return 0
 116    if the memory is allocated but the data not loaded, return 1 if done.  */
 117
 118 static int
 119 mingw32_gt_pch_use_address (void *addr, size_t size, int fd,
 120                             size_t offset)
 121 {
 122   void * mmap_addr;
 123   HANDLE mmap_handle;
 124
 125   /* Apparently, MS Vista puts unnamed file mapping objects into Global
 126      namespace when running an application in a Terminal Server
 127      session.  This causes failure since, by default, applications
 128      don't get SeCreateGlobalPrivilege. We don't need global
 129      memory sharing so explicitly put object into Local namespace.
 130
 131      If multiple concurrent GCC processes are using PCH functionality,
 132      MapViewOfFileEx returns "Access Denied" error.  So we ensure the
 133      session-wide mapping name is unique by appending process ID.  */
 134
 135 #define OBJECT_NAME_FMT "Local\\MinGWGCCPCH-"
 136
 137   char* object_name = NULL;
 138   /* However, the documentation for CreateFileMapping says that on NT4
 139      and earlier, backslashes are invalid in object name.  So, we need
 140      to check if we are on Windows2000 or higher.  */
 141   OSVERSIONINFO version_info;
 142   int r;
 143
 144   version_info.dwOSVersionInfoSize = sizeof (version_info);
 145
 146   if (size == 0)
 147     return 0;
 148
 149   /* Offset must be also be a multiple of allocation granularity for
 150      this to work.  We can't change the offset. */
 151   if ((offset & (va_granularity - 1)) != 0 || size > pch_VA_max_size)
 152     return -1;
 153
 154
 155   /* Determine the version of Windows we are running on and use a
 156      uniquely-named local object if running > 4.  */
 157   GetVersionEx (&version_info);
 158   if (version_info.dwMajorVersion > 4)
 159     {
 160       char local_object_name [sizeof (OBJECT_NAME_FMT)
 161                               + sizeof (DWORD) * 2];
 162       snprintf (local_object_name, sizeof (local_object_name),
 163                 OBJECT_NAME_FMT "%lx", GetCurrentProcessId());
 164       object_name = local_object_name;
 165     }
 166   mmap_handle = CreateFileMappingA ((HANDLE) _get_osfhandle (fd), NULL,
 167                                     PAGE_WRITECOPY | SEC_COMMIT, 0, 0,
 168                                     object_name);
 169
 170   if (mmap_handle == NULL)
 171     {
 172       w32_error (__FUNCTION__,  __FILE__, __LINE__, "CreateFileMapping");
 173       return -1;
 174     }
 175
 176   /* Retry five times, as here might occure a race with multiple gcc's
 177      instances at same time.  */
 178   for (r = 0; r < 5; r++)
 179    {
 180       mmap_addr = MapViewOfFileEx (mmap_handle, FILE_MAP_COPY, 0, offset,
 181                                    size, addr);
 182       if (mmap_addr == addr)
 183         break;
 184       if (r != 4)
 185         Sleep (500);
 186    }
 187
 188   if (mmap_addr != addr)
 189     {
 190       w32_error (__FUNCTION__, __FILE__, __LINE__, "MapViewOfFileEx");
 191       CloseHandle(mmap_handle);
 192       return  -1;
 193     }
 194
 195   return 1;
 196 }
 197
 198 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;