Fix segfault when exceptions are thrown on errors.

That was exactly the point of exceptions; to NOT crash the app!

src/common/FBBackendSDL2.cxx

@@ -39,9 +39,8 @@ FBBackendSDL2::FBBackendSDL2(OSystem& osystem)
   if(SDL_InitSubSystem(SDL_INIT_VIDEO | SDL_INIT_TIMER) < 0)
   {
     ostringstream buf;
-    buf << "ERROR: Couldn't initialize SDL: " << SDL_GetError() << endl;
+    buf << "ERROR: Couldn't initialize SDL: " << SDL_GetError();
-    Logger::error(buf.str());
+    throw runtime_error(buf.str());
-    throw runtime_error("FATAL ERROR");
   }
   Logger::debug("FBBackendSDL2::FBBackendSDL2 SDL_Init()");
 

src/emucore/FrameBuffer.cxx

@@ -31,6 +31,7 @@
 #include "FBSurface.hxx"
 #include "TIASurface.hxx"
 #include "FrameBuffer.hxx"
+#include "PaletteHandler.hxx"
 #include "StateManager.hxx"
 #include "RewindManager.hxx"
 
@@ -78,8 +79,7 @@ void FrameBuffer::initialize()
 {
   // First create the platform-specific backend; it is needed before anything
   // else can be used
-  try { myBackend = MediaFactory::createVideoBackend(myOSystem); }
+  myBackend = MediaFactory::createVideoBackend(myOSystem);
-  catch(const runtime_error& e) { throw e; }
 
   // Get desktop resolution and supported renderers
   vector<Common::Size> windowedDisplays;
@@ -952,7 +952,7 @@ void FrameBuffer::stateChanged(EventHandlerState state)
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-string FrameBuffer::getDisplayKey()
+string FrameBuffer::getDisplayKey() const
 {
   // save current window's display and position
   switch(myBufferType)
@@ -974,7 +974,7 @@ string FrameBuffer::getDisplayKey()
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-string FrameBuffer::getPositionKey()
+string FrameBuffer::getPositionKey() const
 {
   // save current window's display and position
   switch(myBufferType)
@@ -996,13 +996,31 @@ string FrameBuffer::getPositionKey()
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void FrameBuffer::saveCurrentWindowPosition()
+void FrameBuffer::saveCurrentWindowPosition() const
 {
+  if(myBackend)
+  {
     myOSystem.settings().setValue(
       getDisplayKey(), myBackend->getCurrentDisplayIndex());
     if(myBackend->isCurrentWindowPositioned())
       myOSystem.settings().setValue(
         getPositionKey(), myBackend->getCurrentWindowPos());
+  }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void FrameBuffer::saveConfig(Settings& settings) const
+{
+  // Save the last windowed position and display on system shutdown
+  saveCurrentWindowPosition();
+
+  if(myTIASurface)
+  {
+    Logger::debug("Saving TV effects options ...");
+    tiaSurface().ntsc().saveConfig(settings);
+    Logger::debug("Saving palette settings...");
+    tiaSurface().paletteHandler().saveConfig(settings);
+  }
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

src/emucore/FrameBuffer.hxx

@@ -291,12 +291,12 @@ class FrameBuffer
     uInt32 hidpiScaleFactor() const { return myHiDPIEnabled ? 2 : 1; }
 
     /**
-      These methods are used to load/save position and display of the
+      This method should be called to save the current settings of all
-      current window.
+      its subsystems.  Note that the this may be called when the class
+      hasn't been fully initialized, so we first need to check if the
+      subsytems actually exist.
     */
-    string getPositionKey();
+    void saveConfig(Settings& settings) const;
-    string getDisplayKey();
-    void saveCurrentWindowPosition();
 
   #ifdef GUI_SUPPORT
     /**
@@ -376,6 +376,14 @@ class FrameBuffer
     int scaleY(int y) const { return myBackend->scaleY(y); }
 
   private:
+    /**
+      These methods are used to load/save position and display of the
+      current window.
+    */
+    string getPositionKey() const;
+    string getDisplayKey() const;
+    void saveCurrentWindowPosition() const;
+
     /**
       Calls 'free()' on all surfaces that the framebuffer knows about.
     */

src/emucore/OSystem.cxx

@@ -50,7 +50,6 @@
 #include "CartCreator.hxx"
 #include "FrameBuffer.hxx"
 #include "TIASurface.hxx"
-#include "PaletteHandler.hxx"
 #include "TIAConstants.hxx"
 #include "Settings.hxx"
 #include "PropsSet.hxx"
@@ -152,8 +151,9 @@ bool OSystem::create()
     myFrameBuffer = make_unique<FrameBuffer>(*this);
     myFrameBuffer->initialize();
   }
-  catch(...)
+  catch(const runtime_error& e)
   {
+    Logger::error(e.what());
     return false;
   }
 
@@ -258,19 +258,14 @@ void OSystem::loadConfig(const Settings::Options& options)
 void OSystem::saveConfig()
 {
   // Ask all subsystems to save their settings
-  if(myFrameBuffer)
+  if(myFrameBuffer && mySettings)
+    myFrameBuffer->saveConfig(settings());
+
+  if(mySettings)
   {
-    // Save the last windowed position and display on system shutdown
-    myFrameBuffer->saveCurrentWindowPosition();
-
-    Logger::debug("Saving TV effects options ...");
-    myFrameBuffer->tiaSurface().ntsc().saveConfig(settings());
-    Logger::debug("Saving palette settings...");
-    myFrameBuffer->tiaSurface().paletteHandler().saveConfig(settings());
-  }
-
     Logger::debug("Saving config options ...");
     mySettings->save();
+  }
 
   if(myPropSet && myPropSet->save(myPropertiesFile))
     Logger::debug("Saving properties set ...");