src/common/logbacktrace_unix.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2018 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   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 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   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, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #include "quassel.h"
  22
  23 #if defined(HAVE_EXECINFO) && !defined(Q_OS_MAC)
  24 #  define BUILD_CRASHHANDLER
  25 #  include <execinfo.h>
  26 #  include <dlfcn.h>
  27 #  include <cxxabi.h>
  28 #  include <QFile>
  29 #  include <QTextStream>
  30 #  include <QDebug>
  31 #endif
  32
  33 void Quassel::logBacktrace(const QString &filename)
  34 {
  35 #ifndef BUILD_CRASHHANDLER
  36     Q_UNUSED(filename)
  37 #else
  38     void *callstack[128];
  39     int i, frames = backtrace(callstack, 128);
  40
  41     QFile dumpFile(filename);
  42     dumpFile.open(QIODevice::Append);
  43     QTextStream dumpStream(&dumpFile);
  44
  45     for (i = 0; i < frames; ++i) {
  46         Dl_info info;
  47         dladdr(callstack[i], &info);
  48         // as a reference:
  49         //     typedef struct
  50         //     {
  51         //       __const char *dli_fname;   /* File name of defining object.  */
  52         //       void *dli_fbase;           /* Load address of that object.  */
  53         //       __const char *dli_sname;   /* Name of nearest symbol.  */
  54         //       void *dli_saddr;           /* Exact value of nearest symbol.  */
  55         //     } Dl_info;
  56
  57     #ifdef __LP64__
  58         int addrSize = 16;
  59     #else
  60         int addrSize = 8;
  61     #endif
  62
  63         QString funcName;
  64         if (info.dli_sname) {
  65             char *func = abi::__cxa_demangle(info.dli_sname, 0, 0, 0);
  66             if (func) {
  67                 funcName = QString(func);
  68                 free(func);
  69             }
  70             else {
  71                 funcName = QString(info.dli_sname);
  72             }
  73         }
  74         else {
  75             funcName = QString("0x%1").arg((ulong)(info.dli_saddr), addrSize, 16, QLatin1Char('0'));
  76         }
  77
  78         // prettificating the filename
  79         QString fileName("???");
  80         if (info.dli_fname) {
  81             fileName = QString(info.dli_fname);
  82             int slashPos = fileName.lastIndexOf('/');
  83             if (slashPos != -1)
  84                 fileName = fileName.mid(slashPos + 1);
  85         }
  86
  87         QString debugLine = QString("#%1 %2 0x%3 %4").arg(i, 3, 10)
  88                             .arg(fileName, -20)
  89                             .arg((ulong)(callstack[i]), addrSize, 16, QLatin1Char('0'))
  90                             .arg(funcName);
  91
  92         dumpStream << debugLine << "\n";
  93         qDebug() << qPrintable(debugLine);
  94     }
  95     dumpFile.close();
  96 #endif /* BUILD_CRASHHANDLER */
  97 }