Re: Not able to use %union?
Akim Demaille <[email protected]>
| Newsgroups | gmane.comp.parsers.bison.general |
|---|---|
| Message-ID | <[email protected]> |
> Le 18 févr. 2019 à 23:06, Hans Åberg <[email protected]> a écrit : > > >> On 18 Feb 2019, at 04:37, Peng Yu <[email protected]> wrote: >> >> I use rapidstring to make the string operations use and use the Boehm >> garbage collector so that I don't have to always remember to release >> the memory. >> >> https://github.com/boyerjohn/rapidstring >> >> Because I want to use the previously allocated memory, I don't want to >> call "rs_init(&yylval->str)" in any action. > > That is probably not needed (Akim may clarify): Without a GC, just hand over the lexer allocated pointer to the parser marked with a type, and set %destructor for this type to handle error cleanup when the parser stack unwinds; otherwise deallocate in the rules. I don't know enough of how this is supposed to work to answer. Of course, you have to not use the same memory space for returning two strings in a row. https://www.gnu.org/software/bison/manual/bison.html#Strings-are-Destroyed Also, Peng writes: >> I don't want to call "rs_init(&yylval->str)" in any action. You don't have to do that in every action, just the ones returning strings. _______________________________________________ [email protected] https://lists.gnu.org/mailman/listinfo/help-bison