Reentrant Flex Bison - fatal flex scanner internal error--end of buffer missed

Dear Friends,


Greetings !!


I am using flex 2.5.4 & bison 1.35. I am geting the run time error
"fatal flex scanner internal error--end of buffer missed" when i made
the lexer and parser as a part of shared lib and run . I am strugling
to make the lexer and parser reentrant and after reading the
discussions on reentrant flex in this group i have downloaded flex
2.5.31 (i cannot go for c++ version of scanner as of now) and added
%option reentrant in the scanner and %pure_parser in the parser.


On compilation this has resulted in yylex(yyscan_t yyscanner) in the
scanner and gave compilation error saying undefined reference to
yylval. Then i have added %option bison-bridge. It has compiled
everything but gave error 'yyin undefined reference' in my .c file
while linking where i am copying the input file name to yyin.


In the new lexer the definition of yyin has changed (earlier FILE
*yyin) to #define yyin yyg->yyin_r.


Please suggest me how can i copy the input file name into yyin i.e
yyg->yyin_r. Since yyg is a local structure variable in the scanner.


Earlier in my .c file i have declared yyin as 'extern FILE* yyin'. But
now the yyin is '#define yyin yyg->yyin_r' i am not able to pass the
input file name to lexer.


Please help me. Also i will be grateful to you if you suggest me what
are all the changes need to be done to .c files/scanner/parser if
'%option reentrant', '%option bison-bridge' and '%pure_parser' is
added to scanner and parser respectively.


Thanks in advance !!


Regards,
Krishna

Return to the comp.compilers page.
Search the comp.compilers archives again.