[antlr-interest] Re: alternative prediction mechanism for 3.0
Terence Parr
parrt at cs.usfca.edu
Sat Jul 3 12:13:36 PDT 2004
On Jul 2, 2004, at 4:07 PM, antlrbrian wrote:
> --- In antlr-interest at yahoogroups.com, Ric Klaren <klaren at c...> wrote:
>> Terence wrote:
>>> DFA decision = dfaFactory.get("...DFA description...");
>>
>> You mean to have a 'high' level ASCII DFA specification of
>> states/transitions etc. between the ".." or just an id for tha
>> specific DFA?
>>
>> Why not encode the DFA in static tables (that can be 'run'
>> directly without first processing them)?
>> There's lot's of ways to do that if I recall right.
>> It also offers the possibility to dump the tables in separate
>> class files (if size becomes an issue).
>
> Why not generate the DFA to a textual representation, and then compile
> that textual representation to bytecodes. My thinking is:
> 1. The DFA textual representation will be easier to read than
> generated Java code.
> 2. Using the new Java debugging API's (JSR 45), the classfiles
> can be generated in such a way that debuggers can trace
> through the DFA's textual representation directly.
> 4. The JVM GOTO instruction (and other such things) can be used
> to speed things up if necessary.
> 5. It is a good demo of ANTLR's ability to generate tools
> that generate binary output. I've only seen source-to-source
> or source-to-AST translators in ANTLR.
Hi Brian,
A nice idea, one I had considered (generating bytecodes directly that
is). Problem people mentioned is that the start up cost is pretty
expensive for the parser to build/generate the bytecodes...probably not
an issue for many people, but...
Ter
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