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RE: PATCH: parser (was: Re: PATCH: Improved _mailboxes)
- X-seq: zsh-workers 9859
- From: Sven Wischnowsky <wischnow@xxxxxxxxxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxxxxxx
- Subject: RE: PATCH: parser (was: Re: PATCH: Improved _mailboxes)
- Date: Thu, 24 Feb 2000 10:07:55 +0100 (MET)
- In-reply-to: "Andrej Borsenkow"'s message of Thu, 24 Feb 2000 10:47:46 +0300
- Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm
Andrej Borsenkow wrote:
> > Here is the first of the two. As I said, this mainly makes the parser
> > create wordcode directly, no more extra compilation phase.
>
> Sounds really interesting ... Two questions.
>
> Is the code position-independent?
Yes, I took care of that to make copying easier and allow other things
(memory compaction?).
> Is now code-compiler separated from code-interpreter?
There is now nothing I would really call a compiler anymore.
> The main reason for these questions - is it possible to precompile Zsh
> function, store it and then execute directly? This may be intersted in many
> cases - primary use is completion. Precompile completion functions; put
> byte-code in single file; mmap this file. I do not know about speed increase
> (if any) - but it should dramatically reduce RAM footprint on multiuser
> systems. Currently every shell compiles every function on it's own and it
> goes in private memory - and that is real RAM (O.K., it is real swap on some
> systems :-) mmap'ing precompiled byte-code would mean, that just a single
> copy exists.
That would indeed be possible. The wordcode is position- and machine-
independent.
> It may be useful to generalize it to allow byte-code be the contents of
> variable. Then Zsh could simply execute the content of
>
> mapfile[/path/to/precompiled/file] ... may be, not as directly - with
> something like imaginal zcompiler module
>
> zcodeload file
All this also makes me think about a way to allow multiple zsh's to
share other memory bits (like the command table and so on). How
portable is anonymous shared mmap or shared mmap on /dev/null?
Bye
Sven
--
Sven Wischnowsky wischnow@xxxxxxxxxxxxxxxxxxxxxxx
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