flex-help

[Flex-help] yy_start and yy_init uninitialized

[Anand A. <ana...@gm...>]

In below code in generated parser, yy_init and yy_start is showing
uninitialized value. irrelevant crash (at while ( /* CONSTCOND */ 1) is
happening and below code doesn't get executed. My flex is now 3.0.5

> Can this be problem? Right now, after yy.c is generated, I am putting
> these values zero above this code. Similarly for yy_buffer_stack and
> buffer_stack_max.
>  Scanner is with reentrant option and prefix option.
> With prefix option, yyin is not getting prefix, is it true?
> yyin can conflict from first instance of scanner with second instance of
> scanner.
>
> This
>         if ( !yyg->yy_init )
>                 {
>                 yyg->yy_init = 1;
>
> #ifdef YY_USER_INIT
>                 YY_USER_INIT;
> #endif
>
>                 if ( ! yyg->yy_start )
>                         yyg->yy_start = 1;      /* first start state */
>
>                 if ( ! yyin )
>                         yyin = stdin;
>
> >>>>               yyg->yy_buffer_stack = NULL;
> >>>>                yyg->yy_buffer_stack_max = 0;
>                 if ( ! YY_CURRENT_BUFFER ) {
>                         prepyyensure_buffer_stack (yyscanner);
>                         YY_CURRENT_BUFFER_LVALUE =
>                                 prepyy_create_buffer(yyin,YY_BUF_SIZE
> ,yyscanner);
>                 }
>
>                 prepyy_load_buffer_state(yyscanner );
>
> Many Thanks,
> Anand
>
>

Re: [Flex-help] yy_start and yy_init uninitialized

[Will E. <wes...@gm...>]

Your parser is generated by bison, not flex. "3.0.5" is a bison version number, not a flex version number.

On Wednesday,  6 June 2018,  8:14 am +0530, Anand Akhare <ana...@gm...> wrote:

> In below code in generated parser, yy_init and yy_start is showing
> uninitialized value. irrelevant crash (at while ( /* CONSTCOND */ 1) is
> happening and below code doesn't get executed. My flex is now 3.0.5
> 
> > Can this be problem? Right now, after yy.c is generated, I am putting
> > these values zero above this code. Similarly for yy_buffer_stack and
> > buffer_stack_max.
> >  Scanner is with reentrant option and prefix option.
> > With prefix option, yyin is not getting prefix, is it true?
> > yyin can conflict from first instance of scanner with second instance of
> > scanner.
> >
> > This
> >         if ( !yyg->yy_init )
> >                 {
> >                 yyg->yy_init = 1;
> >
> > #ifdef YY_USER_INIT
> >                 YY_USER_INIT;
> > #endif
> >
> >                 if ( ! yyg->yy_start )
> >                         yyg->yy_start = 1;      /* first start state */
> >
> >                 if ( ! yyin )
> >                         yyin = stdin;
> >
> > >>>>               yyg->yy_buffer_stack = NULL;
> > >>>>                yyg->yy_buffer_stack_max = 0;
> >                 if ( ! YY_CURRENT_BUFFER ) {
> >                         prepyyensure_buffer_stack (yyscanner);
> >                         YY_CURRENT_BUFFER_LVALUE =
> >                                 prepyy_create_buffer(yyin,YY_BUF_SIZE
> > ,yyscanner);
> >                 }
> >
> >                 prepyy_load_buffer_state(yyscanner );
> >
> > Many Thanks,
> > Anand
> >
> >
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> -- 
> Flex-help mailing list
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> https://lists.sourceforge.net/lists/listinfo/flex-help

-- 
Will Estes
Flex Project Maintainer
wes...@gm...
https://github.com/westes/flex

Re: [Flex-help] yy_start and yy_init uninitialized

[Anand A. <ana...@gm...>]

Wrong version posted.
It is 2.6.1

On Wed 6 Jun, 2018, 3:13 PM Will Estes, <wes...@gm...> wrote:

> Your parser is generated by bison, not flex. "3.0.5" is a bison version
> number, not a flex version number.
>
> On Wednesday,  6 June 2018,  8:14 am +0530, Anand Akhare <
> ana...@gm...> wrote:
>
> > In below code in generated parser, yy_init and yy_start is showing
> > uninitialized value. irrelevant crash (at while ( /* CONSTCOND */ 1) is
> > happening and below code doesn't get executed. My flex is now 3.0.5
> >
> > > Can this be problem? Right now, after yy.c is generated, I am putting
> > > these values zero above this code. Similarly for yy_buffer_stack and
> > > buffer_stack_max.
> > >  Scanner is with reentrant option and prefix option.
> > > With prefix option, yyin is not getting prefix, is it true?
> > > yyin can conflict from first instance of scanner with second instance
> of
> > > scanner.
> > >
> > > This
> > >         if ( !yyg->yy_init )
> > >                 {
> > >                 yyg->yy_init = 1;
> > >
> > > #ifdef YY_USER_INIT
> > >                 YY_USER_INIT;
> > > #endif
> > >
> > >                 if ( ! yyg->yy_start )
> > >                         yyg->yy_start = 1;      /* first start state */
> > >
> > >                 if ( ! yyin )
> > >                         yyin = stdin;
> > >
> > > >>>>               yyg->yy_buffer_stack = NULL;
> > > >>>>                yyg->yy_buffer_stack_max = 0;
> > >                 if ( ! YY_CURRENT_BUFFER ) {
> > >                         prepyyensure_buffer_stack (yyscanner);
> > >                         YY_CURRENT_BUFFER_LVALUE =
> > >                                 prepyy_create_buffer(yyin,YY_BUF_SIZE
> > > ,yyscanner);
> > >                 }
> > >
> > >                 prepyy_load_buffer_state(yyscanner );
> > >
> > > Many Thanks,
> > > Anand
> > >
> > >
> >
> ------------------------------------------------------------------------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > --
> > Flex-help mailing list
> > Fle...@li...
> > https://lists.sourceforge.net/lists/listinfo/flex-help
>
> --
> Will Estes
> Flex Project Maintainer
> wes...@gm...
> https://github.com/westes/flex
>