Re: C++ parser: segmentation fault using parsing a file twice

[Luigi Malagò]

> hello to everybody,
> i'm new to flex bison and i'm experiencing a strange problem. I have 
> wirtten a C++ parser using
> flex 2.5.33-r1 and bison 2.2. I have to parse two different files, with 
> the same structure, so i decide to use the same parser twice.
> The problem is that when i parse one file OR the other everything is ok, 
> but when i parse both (no matter the order) or when i
> parse one of the two twice, i get a segmentation fault. Using gdm i 
> isolated the following code:
>
>   
> > void assoc_parser(brianBehaviors *bb) {
> >     assocparser_linenumber = 2;
> >     // sl = new assoc_list();
> >     // s = new assoc();   
> >     assoc_init();
> >     //assocdebug=1;
> >     assoc_bbehavior = bb;
> >    
> >     assoc_v = new variable();
> >     printf("ready to parse...\n");
> >     assocparse();
> >     printf("...parsing done\n");
> >     delete assoc_v;
> >
> >     assoc_cancel_memory_leaks();
> > }
> >     
I just solved the problem. The function  assoc_cancel_memory_leaks() 
created the problem. I moved its invocation into the destructor of the 
parser,
to invoke it ony once at the end. Here is its implementation:

void assoc_cancel_memory_leaks()
{
 /* For non-reentrant C scanner only. */
 assoc_delete_buffer(YY_CURRENT_BUFFER);
 yy_init = 1;
}


Thanks a lot,
Luigi


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