libs/pbd/stacktrace.cc

   1 /*
   2     Copyright (C) 2000-2007 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "libpbd-config.h"
  21
  22 #include "pbd/stacktrace.h"
  23 #include <cstdio>
  24 #include <iostream>
  25
  26 void
  27 PBD::trace_twb ()
  28 {
  29 }
  30
  31 /* Obtain a backtrace and print it to stdout. */
  32
  33 #ifdef HAVE_EXECINFO
  34
  35 #include <execinfo.h>
  36 #include <cxxabi.h>
  37
  38 std::string demangle (std::string const & l)
  39 {
  40         std::string::size_type const b = l.find_first_of ("(");
  41         if (b == std::string::npos) {
  42                 return l;
  43         }
  44
  45         std::string::size_type const p = l.find_last_of ("+");
  46         if (p == std::string::npos) {
  47                 return l;
  48         }
  49
  50         if ((p - b) <= 1) {
  51                 return l;
  52         }
  53
  54         std::string const fn = l.substr (b + 1, p - b - 1);
  55
  56         int status;
  57         try {
  58
  59                 char* realname = abi::__cxa_demangle (fn.c_str(), 0, 0, &status);
  60                 std::string d (realname);
  61                 free (realname);
  62                 return d;
  63
  64         } catch (std::exception) {
  65
  66         }
  67
  68         return l;
  69 }
  70
  71 void
  72 PBD::stacktrace (std::ostream& out, int levels)
  73 {
  74         void *array[200];
  75         size_t size;
  76         char **strings;
  77         size_t i;
  78
  79         size = backtrace (array, 200);
  80         strings = backtrace_symbols (array, size);
  81
  82         if (strings) {
  83
  84                 for (i = 0; i < size && (levels == 0 || i < size_t(levels)); i++) {
  85                         out << "  " << demangle (strings[i]) << std::endl;
  86                 }
  87
  88                 free (strings);
  89         }
  90 }
  91
  92 #else
  93
  94 void
  95 PBD::stacktrace (std::ostream& out, int /*levels*/)
  96 {
  97         out << "stack tracing is not enabled on this platform" << std::endl;
  98 }
  99
 100 void
 101 c_stacktrace ()
 102 {
 103         PBD::stacktrace (std::cout);
 104 }
 105
 106 #endif /* HAVE_EXECINFO */