Re: Crash in wrapper_base.cpp

Heh, I may have spoken too soon.  I think having that extra reference on the
stack is preventing garbage collection of the items, even with an explicit
collectgarbage() call.  Any guess at why there wasn't a stack overflow?


On Sat, Jul 9, 2011 at 4:44 PM, Drew McLean <[email protected]> wrote:

> Ooops, seems like I messed up my previous runs of your sample code
> somehow.  I do indeed have different results for the different runs and have
> attached them for you.  I expect that they'll be the same as yours.  For
> reference, I'm using Visual Studio 2008 on Windows 7 x64 but I'm building a
> 32 bit binary.
>
> More importantly though, I have come across 2 interesting observations.
> I've been tinkering with your code and also the code in my engine and have
> found a possible workaround.
>
> First, in my engine, if I simply add the following push of self onto the
> stack before calling the lua function then no crash!
>
>         lua_State *L = m_self.state();
>         m_self.get(L);
>         call<void>("overide");
>
> I find it weird that it didn't cause a stack overflow but I tried it many
> times and let it run for a long time with no observed side effects other
> than it seeming to be working correctly.
>
> The second observation is that when I put the extra push of self onto the
> stack into your sample code before calling overide() it caused an assert.
> After digging around I saw that you didn't provide a constructor for your
> lua class.  Adding that in made the assert go away and also got rid of the
> "Lua instance is nil" messages.
>
>         "function Item:__init(i)\n"
>         "    print('lua constructor')\n"
>         "end\n"
>
> So it seems we may have stumbled upon a workaround if it deems to have no
> side effects although I'm not really comfortable with not knowing why it
> works.  Let me know what you find with your engine.
>
>     Drew
>
>


-- 
Drew McLean
Lead Tech Programmer
A Priori Games
(250) 508-3346
www.apriorigames.com

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