Re: Strange prolog function issue

Emmanuel Astier wrote:
> Hi all, 
>  
>  
> I have here a very strange issue.
>  
> We have a function using a local std::string, exceptions, and a alloca.
>  
> When the exception is thrown, the unwind mecanism tries to delete the std::string, but it deletes it at a wrong address( there is a 0x590 offset ).
>  
> <snip> 
>  
> I could not reproduce this ebp offset that makes the exception handler fail in a small sample. 
> So do you know in which case the compiler does not put esp in ebp, but put an offset in it ?
> And do you know how to fix it ( other than what we're doing : stopping using alloca with exceptions ), if it is a kind a known issue ? 
>   

Does the bug occur in both debug and release builds? Have you tried 
setting the optimization manually for that file?  In any large project, 
I usually find a couple of files that drive some form of compiler bug 
under full optimization, and I have to manually turn down the 
optimization on that particular file or do some sort of special (heavily 
commented!) adaptation, such as moving a function's location in the 
source file, or in the header file. You might also try playing with a 
couple of exception-related compiler switches. Compilers are complicated 
beasts, and any project of a significant size is likely to drive a bug 
or two.


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