Hans Aberg wrote:
>
> On 7 Jan 2008, at 07:20, cwhite wrote:
>
>> I use
>>
>> yylval.string_type = strdup(yytext);
>>
>> in my flex file but it seems that this is wasteful and it may cause
>> memory
>> leaks. I thought that yytext gets replaced everytime the lexer is
>> called so
>> how is this wasteful? How do I free yylval so that those don't happen?
>> Perhaps there is an alternative to strdup, I'd like to know what
>> that is.
>
> See 'man strdup'; memory must be freed using 'free'. Done say in the
> actions, or using %destructor to do it during error recovers (see
> Bison manual).
>
> Hans Aberg
>
> _______________________________________________
> help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison
>
>
So the solution is just
%destructor { free($$); } IDENTIFIER STRING_CONSTANT
and
free(yylval.string_type);
Thanks!
--
View this message in context:
http://www.nabble.com/how-to-free-yylval-tp14659563p14683202.html
Sent from the Gnu - Bison - Help mailing list archive at Nabble.com.
_______________________________________________
help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison
