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logbacktrace_unix.cpp
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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 }