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

   1 // Verbose terminate_handler -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002 Free Software Foundation
   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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 #include <bits/c++config.h>
  31 #include <cstdlib>
  32 #include <exception>
  33 #include <exception_defines.h>
  34 #include <cxxabi.h>
  35
  36 #ifdef _GLIBCXX_HAVE_UNISTD_H
  37 # include <unistd.h>
  38 # define writestr(str)  write(2, str, __builtin_strlen(str))
  39 #else
  40 # include <cstdio>
  41 # define writestr(str)  std::fputs(str, stderr)
  42 #endif
  43
  44 using namespace std;
  45 using namespace abi;
  46
  47 namespace __gnu_cxx
  48 {
  49   /* A replacement for the standard terminate_handler which prints
  50    more information about the terminating exception (if any) on
  51    stderr.  */
  52   void __verbose_terminate_handler()
  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         char const *name = t->name();
  60         // Note that "name" is the mangled name.
  61
  62         {
  63           int status = -1;
  64           char *dem = 0;
  65
  66           dem = __cxa_demangle(name, 0, 0, &status);
  67
  68           writestr("terminate called after throwing an instance of '");
  69           if (status == 0)
  70             writestr(dem);
  71           else
  72             writestr(name);
  73           writestr("'\n");
  74
  75           if (status == 0)
  76             free(dem);
  77         }
  78
  79         // If the exception is derived from std::exception, we can give more
  80         // information.
  81         try { __throw_exception_again; }
  82 #ifdef __EXCEPTIONS
  83         catch (exception &exc)
  84           {
  85             char const *w = exc.what();
  86             writestr("  what():  ");
  87             writestr(w);
  88             writestr("\n");
  89           }
  90 #endif
  91         catch (...) { }
  92       }
  93     else
  94       writestr("terminate called without an active exception\n");
  95
  96     abort();
  97   }
  98 } // namespace __gnu_cxx