Re: Re: Serious (unreproducable) Problems

["Nils Wogatzky" <nils@...>]

First of all thank you for your quick reply.

Do I mix malloc with delete ?

[Code]
...
savObjects = (T**)malloc(Size * sizeof(Objects));
...
delete [] savObjects;
...
[/Code]

like this ?

Then I do, yes. I´m not that good in C++ =)


To your second question ("..Use of objects..") I can reply: I just use function-calls.


I´ll try to find a memory-debugging tool to fix the problem.
(After that I´ll read some C++ - Tutorials and find out why I shouldn´t use malloc and delete;-) )


Thank you


>Hi,
>
>first of all, welcome to Lua.
>
>On Tuesday 19 October 2004 09:12 pm, Nils Wogatzky wrote:
>> I already tried to debug, but in Debug-Mode everything works fine.
>>
>> At least when I just cut-out or change the position of some lines in my
>> script my application works again.
>> This makes no sense, because it already did work well,
>> why should i change the position of those Calls ?
>
>I feel your pain. All these symptoms are indicative of a buffer overflow 
>somewhere in your program, or some other form of heap corruption (i.e. you 
>write past the end of an array, you free dynamically allocated memory twice, 
>you mix new with free() or malloc() with delete, etc. Unfortunately, the 
>cause and the location of the crash are often completely unrelated, so I am 
>afraid that finding the bug may require a long exercise in patience. 
>
>The reason why the behavior of your bug changes in debug mode, or when you 
>move around lines in the lua script, is that it changes the memory allocation 
>patterns of your program, and the heap corruption will consequently not 
>manifest, or in a different place. I've been there and done that, and the 
>only advice that I can give you is: Use a memory debugging tool, such as 
>Purify on Windows, Valgrind on Linux, etc. With any luck, it will pinpoint 
>exactly what is going wrong in your program.
>
>> Do I have some trouble with LUA or with my use of memory ? ;-)
>
>Most likely your use of memory, but it won't hurt to rule out a few things. 
>First, do you store a Lua object past the point when your called C++ function 
>returns? If yes, you need to look at your use of lua_ref(). Second, do you 
>possibly store a reference to a C++ object from within Lua, and it gets 
>deallocated, garbage-collected, or such like?
>
>Good luck
>- Christian
>