[antlr-interest] Grammar.createLookaheadDFA(): could not even do k=1 for decision 45;

[Mark Volkmann]

On Feb 5, 2008 4:57 AM, Erik Kratochvil <discontinuum at gmail.com> wrote:
> Hi.
>
> I have a parser grammar which would not be processed neither by
> antlr-3.0.1 (official release) nor by antlr-3.1b1
> (antlr-2008-01-23.10.tar.gz).
>
> antlr-3.0.1 fails with:
>
> error(10):  internal error:
> org.antlr.tool.Grammar.createLookaheadDFA(Grammar.java:864): could not
> even do k=1 for decision 442
>
> antlr-3.1b1 fails with a little bit more descriptive error:
>
> error(10):  internal error:
> org.antlr.tool.Grammar.createLookaheadDFA(Grammar.java:1138): could
> not even do k=1 for decision 442; reason: timed out (>1000ms)
>
> on top of that antlr-3.1b1 adds a NullPointerException:
>
> error(10):  internal error: O.g : java.lang.NullPointerException
> org.antlr.tool.Grammar.getTokenDisplayName(Grammar.java:2158)
> org.antlr.codegen.CodeGenerator.genTokenTypeNames(CodeGenerator.java:823)
> org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:433)
> org.antlr.Tool.generateRecognizer(Tool.java:416)
> org.antlr.Tool.process(Tool.java:285)
> org.antlr.Tool.main(Tool.java:70)
>
>
> What precisely does this error(10) mean?

Could you try to reproduce this error with a small subset of your
grammar and then send that to the list so we can try it?

-- 
R. Mark Volkmann
Object Computing, Inc.