gcc/config/i386/host-mingw32.c

   1 /* mingw32 host-specific hook definitions.
   2    Copyright (C) 2004, 2007, 2009, 2010 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 "diagnostic.h"
  26
  27
  28 #define WIN32_LEAN_AND_MEAN  /* Not so important if we have windows.h.gch.  */
  29 #include <windows.h>
  30
  31 static void * mingw32_gt_pch_get_address (size_t, int);
  32 static int mingw32_gt_pch_use_address (void *, size_t, int, size_t);
  33 static size_t mingw32_gt_pch_alloc_granularity (void);
  34
  35 #undef HOST_HOOKS_GT_PCH_GET_ADDRESS
  36 #define HOST_HOOKS_GT_PCH_GET_ADDRESS mingw32_gt_pch_get_address
  37 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
  38 #define HOST_HOOKS_GT_PCH_USE_ADDRESS mingw32_gt_pch_use_address
  39 #undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
  40 #define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY mingw32_gt_pch_alloc_granularity
  41
  42 static inline void w32_error(const char*, const char*, int, const char*);
  43
  44 /* FIXME: Is this big enough?  */
  45 static const size_t pch_VA_max_size  = 128 * 1024 * 1024;
  46
  47 /* Granularity for reserving address space.  */
  48 static const size_t va_granularity = 0x10000;
  49
  50 /* Print out the GetLastError() translation.  */
  51 static inline void
  52 w32_error (const char* function, const char* file, int line,
  53            const char* my_msg)
  54 {
  55   LPSTR w32_msgbuf;
  56   FormatMessageA (FORMAT_MESSAGE_ALLOCATE_BUFFER
  57                   | FORMAT_MESSAGE_FROM_SYSTEM
  58                   | FORMAT_MESSAGE_IGNORE_INSERTS
  59                   | FORMAT_MESSAGE_MAX_WIDTH_MASK,
  60                   NULL, GetLastError(),
  61                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  62                   (LPSTR) &w32_msgbuf, 0, NULL);
  63   fprintf(stderr, "internal error in %s, at %s:%d: %s: %s\n",
  64           function, trim_filename (file), line, my_msg, w32_msgbuf);
  65   LocalFree ((HLOCAL)w32_msgbuf);
  66 }
  67
  68 /* Granularity for reserving address space.  */
  69 static size_t mingw32_gt_pch_alloc_granularity (void)
  70 {
  71   return va_granularity;
  72 }
  73
  74 /* Identify an address that's likely to be free in a subsequent invocation
  75    of the compiler.  The area should be able to hold SIZE bytes.  FD is an
  76    open file descriptor if the host would like to probe with mmap.  */
  77
  78 static void *
  79 mingw32_gt_pch_get_address (size_t size, int fd  ATTRIBUTE_UNUSED)
  80 {
  81   void* res;
  82   size = (size + va_granularity - 1) & ~(va_granularity - 1);
  83   if (size > pch_VA_max_size)
  84     return NULL;
  85
  86   /* FIXME: We let system determine base by setting first arg to NULL.
  87      Allocating at top of available address space avoids unnecessary
  88      fragmentation of "ordinary" (malloc's)  address space but may not
  89      be safe  with delayed load of system dll's. Preferred addresses
  90      for NT system dlls is in 0x70000000 to 0x78000000 range.
  91      If we allocate at bottom we need to reserve the address as early
  92      as possible and at the same point in each invocation. */
  93
  94   res = VirtualAlloc (NULL, pch_VA_max_size,
  95                       MEM_RESERVE | MEM_TOP_DOWN,
  96                       PAGE_NOACCESS);
  97   if (!res)
  98     w32_error (__FUNCTION__, __FILE__, __LINE__, "VirtualAlloc");
  99   else
 100     /* We do not need the address space for now, so free it.  */
 101     VirtualFree (res, 0, MEM_RELEASE);
 102
 103   return res;
 104 }
 105
 106 /* ADDR is an address returned by gt_pch_get_address.  Attempt to allocate
 107    SIZE bytes at the same address and load it with the data from FD at
 108    OFFSET.  Return -1 if we couldn't allocate memory at ADDR, return 0
 109    if the memory is allocated but the data not loaded, return 1 if done.  */
 110
 111 static int
 112 mingw32_gt_pch_use_address (void *addr, size_t size, int fd,
 113                             size_t offset)
 114 {
 115   void * mmap_addr;
 116   HANDLE mmap_handle;
 117
 118   /* Apparently, MS Vista puts unnamed file mapping objects into Global
 119      namespace when running an application in a Terminal Server
 120      session.  This causes failure since, by default, applications
 121      don't get SeCreateGlobalPrivilege. We don't need global
 122      memory sharing so explicitly put object into Local namespace.
 123
 124      If multiple concurrent GCC processes are using PCH functionality,
 125      MapViewOfFileEx returns "Access Denied" error.  So we ensure the
 126      session-wide mapping name is unique by appending process ID.  */
 127
 128 #define OBJECT_NAME_FMT "Local\\MinGWGCCPCH-"
 129
 130   char* object_name = NULL;
 131   /* However, the documentation for CreateFileMapping says that on NT4
 132      and earlier, backslashes are invalid in object name.  So, we need
 133      to check if we are on Windows2000 or higher.  */
 134   OSVERSIONINFO version_info;
 135   version_info.dwOSVersionInfoSize = sizeof (version_info);
 136
 137   if (size == 0)
 138     return 0;
 139
 140   /* Offset must be also be a multiple of allocation granularity for
 141      this to work.  We can't change the offset. */
 142   if ((offset & (va_granularity - 1)) != 0 || size > pch_VA_max_size)
 143     return -1;
 144
 145
 146   /* Determine the version of Windows we are running on and use a
 147      uniquely-named local object if running > 4.  */
 148   GetVersionEx (&version_info);
 149   if (version_info.dwMajorVersion > 4)
 150     {
 151       char local_object_name [sizeof (OBJECT_NAME_FMT)
 152                               + sizeof (DWORD) * 2];
 153       snprintf (local_object_name, sizeof (local_object_name),
 154                 OBJECT_NAME_FMT "%lx", GetCurrentProcessId());
 155       object_name = local_object_name;
 156     }
 157
 158   mmap_handle = CreateFileMappingA ((HANDLE) _get_osfhandle (fd), NULL,
 159                                     PAGE_WRITECOPY | SEC_COMMIT, 0, 0,
 160                                     object_name);
 161
 162   if (mmap_handle == NULL)
 163     {
 164       w32_error (__FUNCTION__,  __FILE__, __LINE__, "CreateFileMapping");
 165       return -1;
 166     }
 167   mmap_addr = MapViewOfFileEx (mmap_handle, FILE_MAP_COPY, 0, offset,
 168                                size, addr);
 169   if (mmap_addr != addr)
 170     {
 171       w32_error (__FUNCTION__, __FILE__, __LINE__, "MapViewOfFileEx");
 172       CloseHandle(mmap_handle);
 173       return  -1;
 174     }
 175
 176   return 1;
 177 }
 178
 179 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;