src/common/logbacktrace_unix.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2019 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_BACKTRACE) && !defined(Q_OS_MAC)
  24 #    define BUILD_CRASHHANDLER
  25 #    include <QDebug>
  26 #    include <QFile>
  27 #    include <QTextStream>
  28
  29 #    include <cxxabi.h>
  30 #    include <dlfcn.h>
  31
  32 #    include "backtrace_config.h"
  33 #endif
  34
  35 void Quassel::logBacktrace(const QString& filename)
  36 {
  37 #ifndef BUILD_CRASHHANDLER
  38     Q_UNUSED(filename)
  39 #else
  40     void* callstack[128];
  41     int i, frames = backtrace(callstack, 128);
  42
  43     QFile dumpFile(filename);
  44     dumpFile.open(QIODevice::Append);
  45     QTextStream dumpStream(&dumpFile);
  46
  47     for (i = 0; i < frames; ++i) {
  48         Dl_info info;
  49         dladdr(callstack[i], &info);
  50         // as a reference:
  51         //     typedef struct
  52         //     {
  53         //       __const char *dli_fname;   /* File name of defining object.  */
  54         //       void *dli_fbase;           /* Load address of that object.  */
  55         //       __const char *dli_sname;   /* Name of nearest symbol.  */
  56         //       void *dli_saddr;           /* Exact value of nearest symbol.  */
  57         //     } Dl_info;
  58
  59 #    ifdef __LP64__
  60         int addrSize = 16;
  61 #    else
  62         int addrSize = 8;
  63 #    endif
  64
  65         QString funcName;
  66         if (info.dli_sname) {
  67             char* func = abi::__cxa_demangle(info.dli_sname, nullptr, nullptr, nullptr);
  68             if (func) {
  69                 funcName = QString(func);
  70                 free(func);
  71             }
  72             else {
  73                 funcName = QString(info.dli_sname);
  74             }
  75         }
  76         else {
  77             funcName = QString("0x%1").arg((ulong)(info.dli_saddr), addrSize, 16, QLatin1Char('0'));
  78         }
  79
  80         // prettificating the filename
  81         QString fileName("???");
  82         if (info.dli_fname) {
  83             fileName = QString(info.dli_fname);
  84             int slashPos = fileName.lastIndexOf('/');
  85             if (slashPos != -1)
  86                 fileName = fileName.mid(slashPos + 1);
  87         }
  88
  89         QString debugLine = QString("#%1 %2 0x%3 %4")
  90                                 .arg(i, 3, 10)
  91                                 .arg(fileName, -20)
  92                                 .arg((ulong)(callstack[i]), addrSize, 16, QLatin1Char('0'))
  93                                 .arg(funcName);
  94
  95         dumpStream << debugLine << "\n";
  96         qDebug() << qPrintable(debugLine);
  97     }
  98     dumpFile.close();
  99 #endif /* BUILD_CRASHHANDLER */
 100 }