[antlr-interest] Backtracking and labels

Ivan Brezina ibre5041 at ibrezina.net
Fri Mar 9 02:51:48 PST 2012


Hi
maybe you're hitting already discovered bug. This was introduced in  
the version 3.4. What does the output look like when you use ANTLR  
version 3.3?

Ivan

Quoting Kieran Simpson <kierans777 at gmail.com>:

> For my rule:
>
> rule
>    : OPTION1
>    | value=OPTION2 -> ($value)
>    ;
>
> with backtracking on (and memoize not that I think that's relevant) the
> synpredicate code generated has errors, both for the Java and C targets
> where the variable name is missing in the declaration
>
> eg:
>
> public final void synpred9_grammar_fragment() throws RecognitionException {
>          Token =null;
>
> and
>
> static void synpred9_grammar_fragment(pCoreConfigurationParser ctx )
> {
> 	pANTLR3_COMMON_TOKEN    ;
>
> 	       = NULL;
>
> Interestingly this grammar runs in debug mode when used with Antlrworks
> even though I'm using version 3.4 of Antlr with my project and 3.4 is
> included with Antlrworks (1.4.3).
>
> Just in case it's due to an out of date version, here are some md5sums
>
> 9638f9b7b1b823fcaba977f06f0dd761  ./antlr/3.4/antlrworks-1.4.3.jar
>
> 465472089d78cd80f926f5825a29ec7f  ./lib/antlr-3.4.jar
> 0e0318be407e51fdf7ba6777eabfdf73  ./lib/antlr-runtime-3.4.jar
>
> Is something out of date here or is this a bug with the backtracking
> generation?
>
> Cheers,
>
> List: http://www.antlr.org/mailman/listinfo/antlr-interest
> Unsubscribe:   
> http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>



----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.



More information about the antlr-interest mailing list