libstdc++-v3/libsupc++/vterminate.cc

   1 // Verbose terminate_handler -*- C++ -*-
   2
   3 // Copyright (C) 2001-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #include <bits/c++config.h>
  26
  27 #if _GLIBCXX_HOSTED
  28 #include <cstdlib>
  29 #include <exception>
  30 #include <bits/exception_defines.h>
  31 #include <cxxabi.h>
  32 # include <cstdio>
  33
  34 using namespace std;
  35 using namespace abi;
  36
  37 namespace __gnu_cxx
  38 {
  39 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  40
  41   // A replacement for the standard terminate_handler which prints
  42   // more information about the terminating exception (if any) on
  43   // stderr.
  44   void __verbose_terminate_handler()
  45   {
  46     static bool terminating;
  47     if (terminating)
  48       {
  49         fputs("terminate called recursively\n", stderr);
  50         abort ();
  51       }
  52     terminating = true;
  53
  54     // Make sure there was an exception; terminate is also called for an
  55     // attempt to rethrow when there is no suitable exception.
  56     type_info *t = __cxa_current_exception_type();
  57     if (t)
  58       {
  59         // Note that "name" is the mangled name.
  60         char const *name = t->name();
  61         {
  62           int status = -1;
  63           char *dem = 0;
  64
  65           dem = __cxa_demangle(name, 0, 0, &status);
  66
  67           fputs("terminate called after throwing an instance of '", stderr);
  68           if (status == 0)
  69             fputs(dem, stderr);
  70           else
  71             fputs(name, stderr);
  72           fputs("'\n", stderr);
  73
  74           if (status == 0)
  75             free(dem);
  76         }
  77
  78         // If the exception is derived from std::exception, we can
  79         // give more information.
  80         __try { __throw_exception_again; }
  81 #if __cpp_exceptions
  82         __catch(const exception& exc)
  83           {
  84             char const *w = exc.what();
  85             fputs("  what():  ", stderr);
  86             fputs(w, stderr);
  87             fputs("\n", stderr);
  88           }
  89 #endif
  90         __catch(...) { }
  91       }
  92     else
  93       fputs("terminate called without an active exception\n", stderr);
  94
  95     abort();
  96   }
  97
  98 _GLIBCXX_END_NAMESPACE_VERSION
  99 } // namespace
 100
 101 #endif