gcc/config/i386/host-mingw32.c

   1 /* mingw32 host-specific hook definitions.
   2    Copyright (C) 2004, 2007, 2009 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 "hosthooks.h"
  24 #include "hosthooks-def.h"
  25 #include "toplev.h"
  26 #include "diagnostic.h"
  27
  28
  29 #define WIN32_LEAN_AND_MEAN  /* Not so important if we have windows.h.gch.  */
  30 #include <windows.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 const 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 mingw32_gt_pch_alloc_granularity (void)
  71 {
  72   return va_granularity;
  73 }
  74
  75 /* Identify an address that's likely to be free in a subsequent invocation
  76    of the compiler.  The area should be able to hold SIZE bytes.  FD is an
  77    open file descriptor if the host would like to probe with mmap.  */
  78
  79 static void *
  80 mingw32_gt_pch_get_address (size_t size, int fd  ATTRIBUTE_UNUSED)
  81 {
  82   void* res;
  83   size = (size + va_granularity - 1) & ~(va_granularity - 1);
  84   if (size > pch_VA_max_size)
  85     return NULL;
  86
  87   /* FIXME: We let system determine base by setting first arg to NULL.
  88      Allocating at top of available address space avoids unnecessary
  89      fragmentation of "ordinary" (malloc's)  address space but may not
  90      be safe  with delayed load of system dll's. Preferred addresses
  91      for NT system dlls is in 0x70000000 to 0x78000000 range.
  92      If we allocate at bottom we need to reserve the address as early
  93      as possible and at the same point in each invocation. */
  94
  95   res = VirtualAlloc (NULL, pch_VA_max_size,
  96                       MEM_RESERVE | MEM_TOP_DOWN,
  97                       PAGE_NOACCESS);
  98   if (!res)
  99     w32_error (__FUNCTION__, __FILE__, __LINE__, "VirtualAlloc");
 100   else
 101     /* We do not need the address space for now, so free it.  */
 102     VirtualFree (res, 0, MEM_RELEASE);
 103
 104   return res;
 105 }
 106
 107 /* ADDR is an address returned by gt_pch_get_address.  Attempt to allocate
 108    SIZE bytes at the same address and load it with the data from FD at
 109    OFFSET.  Return -1 if we couldn't allocate memory at ADDR, return 0
 110    if the memory is allocated but the data not loaded, return 1 if done.  */
 111
 112 static int
 113 mingw32_gt_pch_use_address (void *addr, size_t size, int fd,
 114                             size_t offset)
 115 {
 116   void * mmap_addr;
 117   HANDLE mmap_handle;
 118
 119   /* Apparently, MS Vista puts unnamed file mapping objects into Global
 120      namespace when running an application in a Terminal Server
 121      session.  This causes failure since, by default, applications
 122      don't get SeCreateGlobalPrivilege. We don't need global
 123      memory sharing so explicitly put object into Local namespace.
 124
 125      If multiple concurrent GCC processes are using PCH functionality,
 126      MapViewOfFileEx returns "Access Denied" error.  So we ensure the
 127      session-wide mapping name is unique by appending process ID.  */
 128
 129 #define OBJECT_NAME_FMT "Local\\MinGWGCCPCH-"
 130
 131   char* object_name = NULL;
 132   /* However, the documentation for CreateFileMapping says that on NT4
 133      and earlier, backslashes are invalid in object name.  So, we need
 134      to check if we are on Windows2000 or higher.  */
 135   OSVERSIONINFO version_info;
 136   version_info.dwOSVersionInfoSize = sizeof (version_info);
 137
 138   if (size == 0)
 139     return 0;
 140
 141   /* Offset must be also be a multiple of allocation granularity for
 142      this to work.  We can't change the offset. */
 143   if ((offset & (va_granularity - 1)) != 0 || size > pch_VA_max_size)
 144     return -1;
 145
 146
 147   /* Determine the version of Windows we are running on and use a
 148      uniquely-named local object if running > 4.  */
 149   GetVersionEx (&version_info);
 150   if (version_info.dwMajorVersion > 4)
 151     {
 152       char local_object_name [sizeof (OBJECT_NAME_FMT)
 153                               + sizeof (DWORD) * 2];
 154       snprintf (local_object_name, sizeof (local_object_name),
 155                 OBJECT_NAME_FMT "%lx", GetCurrentProcessId());
 156       object_name = local_object_name;
 157     }
 158
 159   mmap_handle = CreateFileMappingA ((HANDLE) _get_osfhandle (fd), NULL,
 160                                     PAGE_WRITECOPY | SEC_COMMIT, 0, 0,
 161                                     object_name);
 162
 163   if (mmap_handle == NULL)
 164     {
 165       w32_error (__FUNCTION__,  __FILE__, __LINE__, "CreateFileMapping");
 166       return -1;
 167     }
 168   mmap_addr = MapViewOfFileEx (mmap_handle, FILE_MAP_COPY, 0, offset,
 169                                size, addr);
 170   if (mmap_addr != addr)
 171     {
 172       w32_error (__FUNCTION__, __FILE__, __LINE__, "MapViewOfFileEx");
 173       CloseHandle(mmap_handle);
 174       return  -1;
 175     }
 176
 177   return 1;
 178 }
 179
 180 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;