gdb/gdb-dlfcn.c

   1 /* Platform independent shared object routines for GDB.
   2
   3    Copyright (C) 2011-2016 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdb-dlfcn.h"
  22
  23 #ifdef HAVE_DLFCN_H
  24 #include <dlfcn.h>
  25 #elif __MINGW32__
  26 #include <windows.h>
  27 #else
  28 /* Unsupported configuration. */
  29 #define NO_SHARED_LIB
  30 #endif
  31
  32 #ifdef NO_SHARED_LIB
  33
  34 void *
  35 gdb_dlopen (const char *filename)
  36 {
  37   gdb_assert_not_reached ("gdb_dlopen should not be called on this platform.");
  38 }
  39
  40 void *
  41 gdb_dlsym (void *handle, const char *symbol)
  42 {
  43   gdb_assert_not_reached ("gdb_dlsym should not be called on this platform.");
  44 }
  45
  46 struct cleanup *
  47 make_cleanup_dlclose (void *handle)
  48 {
  49   gdb_assert_not_reached ("make_cleanup_dlclose should not be called on this "
  50                           "platform.");
  51 }
  52
  53 int
  54 gdb_dlclose (void *handle)
  55 {
  56   gdb_assert_not_reached ("gdb_dlclose should not be called on this platform.");
  57 }
  58
  59 int
  60 is_dl_available (void)
  61 {
  62   return 0;
  63 }
  64
  65 #else /* NO_SHARED_LIB */
  66
  67 void *
  68 gdb_dlopen (const char *filename)
  69 {
  70   void *result;
  71 #ifdef HAVE_DLFCN_H
  72   result = dlopen (filename, RTLD_NOW);
  73 #elif __MINGW32__
  74   result = (void *) LoadLibrary (filename);
  75 #endif
  76   if (result != NULL)
  77     return result;
  78
  79 #ifdef HAVE_DLFCN_H
  80   error (_("Could not load %s: %s"), filename, dlerror());
  81 #else
  82   {
  83     LPVOID buffer;
  84     DWORD dw;
  85
  86     dw = GetLastError();
  87
  88     FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
  89                    FORMAT_MESSAGE_IGNORE_INSERTS,
  90                    NULL, dw, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  91                    (LPTSTR) &buffer,
  92                    0, NULL);
  93
  94     error (_("Could not load %s: %s"), filename, (char *) buffer);
  95   }
  96 #endif
  97 }
  98
  99 void *
 100 gdb_dlsym (void *handle, const char *symbol)
 101 {
 102 #ifdef HAVE_DLFCN_H
 103   return dlsym (handle, symbol);
 104 #elif __MINGW32__
 105   return (void *) GetProcAddress ((HMODULE) handle, symbol);
 106 #endif
 107 }
 108
 109 int
 110 gdb_dlclose (void *handle)
 111 {
 112 #ifdef HAVE_DLFCN_H
 113   return dlclose (handle);
 114 #elif __MINGW32__
 115   return !((int) FreeLibrary ((HMODULE) handle));
 116 #endif
 117 }
 118
 119 static void
 120 do_dlclose_cleanup (void *handle)
 121 {
 122   gdb_dlclose (handle);
 123 }
 124
 125 struct cleanup *
 126 make_cleanup_dlclose (void *handle)
 127 {
 128   return make_cleanup (do_dlclose_cleanup, handle);
 129 }
 130
 131 int
 132 is_dl_available (void)
 133 {
 134   return 1;
 135 }
 136
 137 #endif /* NO_SHARED_LIB */