core: Catch and I_Error uncaught exceptions in main

src/sdl/CMakeLists.txt

@@ -6,7 +6,7 @@ target_sources(SRB2SDL2 PRIVATE
 	i_threads.c
 	i_net.c
 	i_system.c
-	i_main.c
+	i_main.cpp
 	i_video.c
 	dosstr.c
 	endtxt.c

src/sdl/i_main.cpp

@@ -23,6 +23,10 @@
 #include "../m_misc.h"/* path shit */
 #include "../i_system.h"
 
+#include <exception>
+#include <stdexcept>
+#include <string>
+
 #if defined (__GNUC__) || defined (__unix__)
 #include <unistd.h>
 #endif
@@ -31,7 +35,9 @@
 #include <errno.h>
 #endif
 
+extern "C" {
 #include "time.h" // For log timestamps
+}
 
 #ifdef HAVE_SDL
 
@@ -70,7 +76,9 @@ char logfilename[1024];
 #endif
 
 #if defined (_WIN32)
+extern "C" {
 #include "../win32/win_dbg.h"
+}
 typedef BOOL (WINAPI *p_IsDebuggerPresent)(VOID);
 #endif
 
@@ -151,20 +159,20 @@ static void InitLogging(void)
 		if (M_IsPathAbsolute(reldir))
 		{
 			left = snprintf(logfilename, sizeof logfilename,
-					"%s"PATHSEP, reldir);
+					"%s" PATHSEP, reldir);
 		}
 		else
 #ifdef DEFAULTDIR
 		if (logdir)
 		{
 			left = snprintf(logfilename, sizeof logfilename,
-					"%s"PATHSEP DEFAULTDIR PATHSEP"%s"PATHSEP, logdir, reldir);
+					"%s" PATHSEP DEFAULTDIR PATHSEP "%s" PATHSEP, logdir, reldir);
 		}
 		else
 #endif/*DEFAULTDIR*/
 		{
 			left = snprintf(logfilename, sizeof logfilename,
-					"."PATHSEP"%s"PATHSEP, reldir);
+					"." PATHSEP "%s" PATHSEP, reldir);
 		}
 
 		strftime(&logfilename[left], sizeof logfilename - left,
@@ -208,6 +216,33 @@ ChDirToExe (void)
 }
 #endif
 
+static void walk_exception_stack(std::string& accum, bool nested) {
+	if (nested)
+		accum.append("\n  Caused by: Unknown exception");
+	else
+		accum.append("Uncaught exception: Unknown exception");
+}
+
+static void walk_exception_stack(std::string& accum, const std::exception& ex, bool nested) {
+	if (nested)
+		accum.append("\n  Caused by: ");
+	else
+		accum.append("Uncaught exception: ");
+
+	accum.append("(");
+	accum.append(typeid(ex).name());
+	accum.append(") ");
+	accum.append(ex.what());
+
+	try {
+		std::rethrow_if_nested(ex);
+	} catch (const std::exception& ex) {
+		walk_exception_stack(accum, ex, true);
+	} catch (...) {
+		walk_exception_stack(accum, true);
+	}
+}
+
 
 /**	\brief	The main function
 
@@ -268,6 +303,8 @@ int main(int argc, char **argv)
 	MakeCodeWritable();
 #endif
 
+	try {
+
 	// startup SRB2
 	CONS_Printf("Setting up Dr. Robotnik's Ring Racers...\n");
 	D_SRB2Main();
@@ -279,6 +316,16 @@ int main(int argc, char **argv)
 	// never return
 	D_SRB2Loop();
 
+	} catch (const std::exception& ex) {
+		std::string exception;
+		walk_exception_stack(exception, ex, false);
+		I_Error("%s", exception.c_str());
+	} catch (...) {
+		std::string exception;
+		walk_exception_stack(exception, false);
+		I_Error("%s", exception.c_str());
+	}
+
 #ifdef BUGTRAP
 	// This is safe even if BT didn't start.
 	ShutdownBugTrap();