Re: Strange backtrace

A Dimarts, 28 de juliol de 2009, Stefan Majewsky va escriure:
> Hi,
>
> during my last refactoring, I've introduced some crashes in Kolf 2, which
> I'm working through currently. While analysing a backtrace, I stumbled upon
> something that puzzled me, and contradicts my understanding of C++. As it
> might be that this misunderstanding hinders me from discovering the true
> source of the crash, I thought it might be good to ask for help here. Here
> is
>
> the relevant part of the backtrace:
> > Application: Kolf (kolf-ng), signal: Segmentation fault
> > [KCrash Handler]
> > #6  0x00000000 in ?? ()
> > #7  0x0808f277 in Kolf::Game::setCurrentHole (this=0xbfb99b78, newHole=0)
> > at /home/smajewsky/Code/kolf/kolf/engine/game.cpp:109
> > #8  0x08093a56 in Kolf::NormalGame::startGame (this=0x82097e8)
> > at /home/smajewsky/Code/kolf/kolf/engine/game-normal.cpp:77
> > #9  0x080966a4 in Kolf::MainWindowPrivate::newGame (this=0x81e50a8)
> > at /home/smajewsky/Code/kolf/kolf/intßerface/mainwindow.cpp:87
>
> And here's a code sample from the Kolf::NormalGame class, a subclass of
> Kolf::Game: (The full code is in playground/games/kolf-ng/engine.)
>
> bool Kolf::NormalGame::startGame()
> {
>       if (players().count() == 0 || course()->holeCount() <= 0)
>               return false;
>       gameUI()->setWindowTitle(course()->title());
>       //start with first hole and first player
>       setCurrentHole(0); /* This is line 77 */
>       return true;
> }
>
> As you see, the second-to-last line in the method invokes
> Kolf::Game::setCurrentHole, which equals the step from #8 to #7 in above
> backtrace. The fact that puzzles me is that the this pointer changes
> between #8 and #7. How can I interpret this? In my understanding the this
> pointer stays the same even during casts (if we disregard multiple
> inheritance which is not used in this class layout). Is this wrong?
>
> Thanks for any help.

Tried valgrind?

Albert

>
> Greetings
> Stefan

 
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