gdbserver/dll.cc

   1 /* Copyright (C) 2002-2020 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "server.h"
  19 #include "dll.h"
  20
  21 #include <algorithm>
  22
  23 /* An "unspecified" CORE_ADDR, for match_dll.  */
  24 #define UNSPECIFIED_CORE_ADDR (~(CORE_ADDR) 0)
  25
  26 std::list<dll_info> all_dlls;
  27 int dlls_changed;
  28
  29 /* Record a newly loaded DLL at BASE_ADDR.  */
  30
  31 void
  32 loaded_dll (const char *name, CORE_ADDR base_addr)
  33 {
  34   all_dlls.emplace_back (name != NULL ? name : "", base_addr);
  35   dlls_changed = 1;
  36 }
  37
  38 /* Record that the DLL with NAME and BASE_ADDR has been unloaded.  */
  39
  40 void
  41 unloaded_dll (const char *name, CORE_ADDR base_addr)
  42 {
  43   auto pred = [&] (const dll_info &dll)
  44     {
  45       if (base_addr != UNSPECIFIED_CORE_ADDR
  46           && base_addr == dll.base_addr)
  47         return true;
  48
  49       if (name != NULL && dll.name == name)
  50         return true;
  51
  52       return false;
  53     };
  54
  55   auto iter = std::find_if (all_dlls.begin (), all_dlls.end (), pred);
  56
  57   if (iter == all_dlls.end ())
  58     /* For some inferiors we might get unloaded_dll events without having
  59        a corresponding loaded_dll.  In that case, the dll cannot be found
  60        in ALL_DLL, and there is nothing further for us to do.
  61
  62        This has been observed when running 32bit executables on Windows64
  63        (i.e. through WOW64, the interface between the 32bits and 64bits
  64        worlds).  In that case, the inferior always does some strange
  65        unloading of unnamed dll.  */
  66     return;
  67   else
  68     {
  69       /* DLL has been found so remove the entry and free associated
  70          resources.  */
  71       all_dlls.erase (iter);
  72       dlls_changed = 1;
  73     }
  74 }
  75
  76 void
  77 clear_dlls (void)
  78 {
  79   all_dlls.clear ();
  80 }