Re: [Boost-users] Regex crash

From: Alan Gray (alan_l_gray_at_[hidden])
Date: 2006-08-10 00:46:51

Hi John,

I cannot reproduce the problem in a sample program (yet). The symptions 
appear to be stack corruption. In the function

template <class charT>
w32_regex_traits_char_layer<charT>::w32_regex_traits_char_layer(::boost::re_detail::lcid_type 
l)
   : w32_regex_traits_base<charT>(l)
{

line 187: w32_regex_traits.hpp

the line

   std::string cat_name(w32_regex_traits<charT>::get_catalog_name());

executes ok, looking at the debugger, _Mysize = 0 , _Myres = 15 which is 
expected. Then stepping into

   if(cat_name.size())

inside the call, _mysize is now equal to some crazy number. The interesting 
point is that the debugger steps to the line

                return (_Mysize);

and bypasses the line above being

                {	// return length of sequence

In the sample program, the debugger always steps onto the { line, then the 
return line. So at this point, something has lost the plot.

To try to narrow down the problem, I put the call to the wregex as the first 
lines in the program. In theory, no corruption of any memory should have 
occured during

void __cdecl _initterm (

initialisation. As a test, I am downloading another regular expression class 
to see what happens. I have run with Compuware Bounds Checker, and every 
other trick I know, and there just does not seem to be any memory 
corruption, dangling pointers or anything.

It's driving me mad, but I realise without a sample program showing the 
problem, neither can you.

Regards,
Alan

>From: "John Maddock" <john_at_[hidden]>
>Reply-To: boost-users_at_[hidden]
>To: <boost-users_at_[hidden]>
>Subject: Re: [Boost-users] Regex crash
>Date: Wed, 9 Aug 2006 17:08:32 +0100
>
>Alan Gray wrote:
> > Hi all,
> >
> > Has anyone had troubles with using wregex? regex works fine for me.
> > Here is the stack dump.
>
>Dangling pointer maybe?  Otherwise please try and produce a test case.
>
>Many thanks,  John.
>_______________________________________________
>Boost-users mailing list
>Boost-users_at_[hidden]
>http://lists.boost.org/mailman/listinfo.cgi/boost-users