[antlr-interest] Re: Intermitent bug with ANTLR.

[lachinois2002]

Hi Monty,

Well... I'm outa luck, after adding 2 or 3 rules to my grammar it 
seems like the bug doesnt show up anymore. This really looks like a 
java VM bug. In anycase, if this happens again I'll trace it and 
hope it behaves the same with the trace activated.

Daniel Shane

--- In antlr-interest at yahoogroups.com, mzukowski at y... wrote:
> To continue on the theme of the week, try building with -trace and 
then
> running.  I'd be curious to see the difference between success & 
failure.
> 
> Monty
> 
> -----Original Message-----
> From: Daniel Shane [mailto:lachinois at h...] 
> Sent: Wednesday, January 28, 2004 11:49 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] Intermitent bug with ANTLR.
> 
> Hi everyone, mostly Terence.
> 
> I will greatly need your help on this one. I have a grammar (that 
uses XPA) 
> and, listen to this, I sometimes get a grammar error, and 
sometimes not by 
> executing the same command line with the same input.
> 
> Here is what happens:
> 
> $ java -cp 
> "/usr/local/soft/antlr-2.7.2/lib/antlr.jar:/usr/local/soft/xpa-
1.0.1/lib/xpa
> 1_0_1-full.jar:.:Code" 
> MainRegulationParser tmp/Fr/C.R.C.,_c._100.06-MTE.html > /tmp/g
> 
> $ java -cp 
> "/usr/local/soft/antlr-2.7.2/lib/antlr.jar:/usr/local/soft/xpa-
1.0.1/lib/xpa
> 1_0_1-full.jar:.:Code" 
> MainRegulationParser tmp/Fr/C.R.C.,_c._100.06-MTE.html > /tmp/g
> 
> $ java -cp 
> "/usr/local/soft/antlr-2.7.2/lib/antlr.jar:/usr/local/soft/xpa-
1.0.1/lib/xpa
> 1_0_1-full.jar:.:Code" 
> MainRegulationParser tmp/Fr/C.R.C.,_c._100.06-MTE.html > /tmp/g
> 
> $ java -cp 
> "/usr/local/soft/antlr-2.7.2/lib/antlr.jar:/usr/local/soft/xpa-
1.0.1/lib/xpa
> 1_0_1-full.jar:.:Code" 
> MainRegulationParser tmp/Fr/C.R.C.,_c._100.06-MTE.html > /tmp/g
> line 3: expecting "<IdOfRegulation>", found 'TitleOfAct'
> 
> $ java -cp 
> "/usr/local/soft/antlr-2.7.2/lib/antlr.jar:/usr/local/soft/xpa-
1.0.1/lib/xpa
> 1_0_1-full.jar:.:Code" 
> MainRegulationParser tmp/Fr/C.R.C.,_c._100.06-MTE.html > /tmp/g
> 
> $
> 
> These invocation were done in sequence and the input file has not 
changed 
> between invocations. I printed some debug out of ANTLR to show the 
sequence 
> of tokens that have been read and in both cases the token sequence 
is the 
> same.
> 
> Something is happening in ANTLR that is causing it to take a 
different path 
> for what seems like a random reason.
> 
> This is really causing me a headache, and I can trace the problem 
to one 
> rule I added in the grammar. If I remove this rule, then I do not 
get this 
> strange behavior (BTW, the rule is simple, so I'm not doing 
anything tricky 
> here). I really cannot see why this additionnal rule would break 
anything 
> and specially not like this.
> 
> I really out of clues here, what would you like me to do to give 
you some 
> additionnal information? Do you want the java files/grammar so 
that you can 
> run it on your setup see if it does the same? Would you like an 
ssh access 
> to this linux machine to see for yourself? Do you think the bug 
arrises from
> 
> XPA?
> 
> I'm running on Linux, RedHat 9 with the SUN JDK 1.4.2 for linux.
> 
> Daniel Shane
> 
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