This Week in Perl 6 (27 May - 2 June 2001)
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It was a quiet week, with a mere 92 messages across 3 of the mailing lists. There were 9 threads, with 27 authors contributing. 3 threads generated 71 of the messages.
Dan Suglaski summed up his thoughts on the previous week's register discussion.
1) The paired register thing's silly. Forget I mentioned it.
2) The interpreter will have some int, float, and string registers. Some stuff will be faster because of it, and it'll make the generated TIL or C code (when we do a TILperl or perl2c version) faster since we won't need to call opcode functions to add 3 and 4 together...
3) Whether the registers are really stack-based or not's an implementation detail. They'll be based off of some per-interpreter thing, of course, so'll be thread-local
4) We will have some sort of register push/pop system independent of the register implementation. (Probably, like the 68K family, with the ability to move multiple registers in one go)
5) The bytecode should be really, really close to the final executable form. I'd really like to be able to read in the bytecode in one big chunk and start executing it without change. (We'll end up with some sections that'll need to be changed--that's inevitable. If we can mmap in the non-fixup section pieces, though, that'd be great)
6) We may formally split the registers used to pass parameters from the working registers. I'm not sure if that'll ultimately be a win or not. (I can forsee lots of pointless register->register moving, and I'm not keen on pointless anything)
This spawned various discussions on several issues:
Dave Mitchell posted his revised draft of the "Conventions and Guidelines for Perl Source Code" PDD. The revision was generally accepted (save a brief foray into some standard (but relatively tame) tabs and spaces and brace alignment discussions), and the official PDD Proposal should be forthcoming shortly.
A.C. Yardley pointed out some technical documents on .NET as an FYI. (The links were to here and here.)
David L. Nicol
mused about a new magical variable
it that automatically refers to the last lexically used variable (or perhaps
the last variable used as the target of
defined or
exists). Most folks found it (in both senses of the word) too troublesome and
ambiguous.
There have been, to date, 28 different mailing lists associated with the
Perl 6 development effort - a list that seems most daunting at first.
That list has now been reduced to eight "open" lists that are currently in
use. (The previous lists may be reopened at a later date, and new ones may
be created. Annoucements will be made in the usual fashion on
perl6-announce.) Subscription instructions and links to the archives can be found
here.
The currently active lists dedicated to Perl 6 are
-all,
-announce,
-build,
-internals,
-language,
-meta, and
-stdlib.
The last list,
perl-qa, is involved in quality assurance for Perl in general, so it is also
included as a Perl 6 development list.
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