From e388f72b97a1f9e96a9aeb01390dbbc47d32e2a4 Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Wed, 20 Oct 2021 22:18:03 +0200
Subject: [PATCH] WIP: Use Boost.Stacktrace to print a stacktrace in case of
 unhandled errors

---
 connector/syncthingconnection.cpp |  1 +
 tray/CMakeLists.txt               |  3 +++
 tray/application/main.cpp         | 30 ++++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/connector/syncthingconnection.cpp b/connector/syncthingconnection.cpp
index 750db9a..31da780 100644
--- a/connector/syncthingconnection.cpp
+++ b/connector/syncthingconnection.cpp
@@ -592,6 +592,7 @@ SyncthingDir *SyncthingConnection::addDirInfo(std::vector<SyncthingDir> &dirs, c
  */
 SyncthingDev *SyncthingConnection::findDevInfo(const QString &devId, int &row)
 {
+    throw std::runtime_error("foobar");
     row = 0;
     for (SyncthingDev &d : m_devs) {
         if (d.id == devId) {
diff --git a/tray/CMakeLists.txt b/tray/CMakeLists.txt
index 9a4bf1c..82748cc 100644
--- a/tray/CMakeLists.txt
+++ b/tray/CMakeLists.txt
@@ -114,6 +114,9 @@ if (NOT QT_FORK_AWESOME_ICON_ENGINE_LIB_IS_SHARED)
     use_qt_fork_awesome_icon_engine()
 endif ()
 
+# use Boost.Stacktrace to print stacktraces in case of fatal errors
+use_package(TARGET_NAME Boost::stacktrace_basic PACKAGE_NAME Boost PACKAGE_ARGS "COMPONENTS;stacktrace_basic")
+
 # link also explicitly against the following Qt modules
 list(APPEND ADDITIONAL_QT_MODULES Network)
 
diff --git a/tray/application/main.cpp b/tray/application/main.cpp
index d70c009..b6ea9c9 100644
--- a/tray/application/main.cpp
+++ b/tray/application/main.cpp
@@ -18,6 +18,9 @@
 #include <c++utilities/application/commandlineutils.h>
 #include <c++utilities/misc/parseerror.h>
 
+#include <boost/stacktrace/stacktrace.hpp>
+#include <boost/stacktrace/safe_dump_to.hpp>
+
 #include <qtutilities/resources/importplugin.h>
 #include <qtutilities/resources/qtconfigarguments.h>
 #include <qtutilities/resources/resources.h>
@@ -29,6 +32,9 @@
 #include <QSettings>
 #include <QStringBuilder>
 
+#include <csignal>
+#include <fstream>
+
 #include <iostream>
 
 using namespace std;
@@ -237,7 +243,31 @@ int runApplication(int argc, const char *const *argv)
     return res;
 }
 
+static void printStackTrace()
+{
+    try {
+        std::cerr << boost::stacktrace::stacktrace();
+    } catch (...) {}
+    std::abort();
+}
+
+static void printStackTraceFromSignalHandler(int signal)
+{
+    std::signal(SIGSEGV, SIG_DFL);
+    std::signal(SIGABRT, SIG_DFL);
+    boost::stacktrace::safe_dump_to(PROJECT_VARNAME "-stacktrace-dump.bin");
+    std::raise(signal);
+}
+
 int main(int argc, char *argv[])
 {
+    std::set_terminate(&printStackTrace);
+    std::signal(SIGABRT, &printStackTraceFromSignalHandler);
+    std::signal(SIGSEGV, &printStackTraceFromSignalHandler);
+    if (auto stacktraceFile = std::ifstream("stacktrace.bin", std::ios_base::in | std::ios_base::binary); stacktraceFile.is_open()) {
+        std::cerr << "Last execution crashed:\n" << boost::stacktrace::stacktrace::from_dump(stacktraceFile);
+        std::rename(PROJECT_VARNAME "-stacktrace-dump.bin", PROJECT_VARNAME "-stacktrace-dump.bin.bak");
+    }
+
     return runApplication(argc, argv);
 }