gdbserver/dll.cc

   1 /* Copyright (C) 2002-2021 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 /* Record a newly loaded DLL at BASE_ADDR for the current process.  */
  27
  28 void
  29 loaded_dll (const char *name, CORE_ADDR base_addr)
  30 {
  31   loaded_dll (current_process (), name, base_addr);
  32 }
  33
  34 /* Record a newly loaded DLL at BASE_ADDR for PROC.  */
  35
  36 void
  37 loaded_dll (process_info *proc, const char *name, CORE_ADDR base_addr)
  38 {
  39   gdb_assert (proc != nullptr);
  40   proc->all_dlls.emplace_back (name != nullptr ? name : "", base_addr);
  41   proc->dlls_changed = true;
  42 }
  43
  44 /* Record that the DLL with NAME and BASE_ADDR has been unloaded
  45    from the current process.  */
  46
  47 void
  48 unloaded_dll (const char *name, CORE_ADDR base_addr)
  49 {
  50   unloaded_dll (current_process (), name, base_addr);
  51 }
  52
  53 /* Record that the DLL with NAME and BASE_ADDR has been unloaded
  54    from PROC.  */
  55
  56 void
  57 unloaded_dll (process_info *proc, const char *name, CORE_ADDR base_addr)
  58 {
  59   gdb_assert (proc != nullptr);
  60   auto pred = [&] (const dll_info &dll)
  61     {
  62       if (base_addr != UNSPECIFIED_CORE_ADDR
  63           && base_addr == dll.base_addr)
  64         return true;
  65
  66       if (name != NULL && dll.name == name)
  67         return true;
  68
  69       return false;
  70     };
  71
  72   auto iter = std::find_if (proc->all_dlls.begin (), proc->all_dlls.end (),
  73                             pred);
  74
  75   if (iter == proc->all_dlls.end ())
  76     /* For some inferiors we might get unloaded_dll events without having
  77        a corresponding loaded_dll.  In that case, the dll cannot be found
  78        in ALL_DLL, and there is nothing further for us to do.
  79
  80        This has been observed when running 32bit executables on Windows64
  81        (i.e. through WOW64, the interface between the 32bits and 64bits
  82        worlds).  In that case, the inferior always does some strange
  83        unloading of unnamed dll.  */
  84     return;
  85   else
  86     {
  87       /* DLL has been found so remove the entry and free associated
  88          resources.  */
  89       proc->all_dlls.erase (iter);
  90       proc->dlls_changed = true;
  91     }
  92 }
  93
  94 void
  95 clear_dlls (void)
  96 {
  97   for_each_process ([] (process_info *proc)
  98     {
  99       proc->all_dlls.clear ();
 100     });
 101 }