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Message from discussion Storing external data in PMCs
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Arthur Bergman  
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 More options Oct 27 2003, 10:50 am
Newsgroups: perl.perl6.internals
From: s...@nanisky.com (Arthur Bergman)
Date: Mon, 27 Oct 2003 15:35:42 +0000
Local: Mon, Oct 27 2003 10:35 am
Subject: Re: Storing external data in PMCs
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On Monday, October 27, 2003, at 03:26  pm, Melvin Smith wrote:

> At 02:56 PM 10/27/2003 +0000, Arthur Bergman wrote:
>> So I am currently trying to do a Perl5LVALUE pmc, a stumbling block
>> is however that I need to pass the PMC the thing that it is
>> lvalueling, I was planning to use the pmc data field for storing this
>> but I cannot access it as a extender without violating the API and
>> guessing at layouts which is kind of bad (Dan says so ;)

> I don't know Perl5 internals enough to know exactly what Perl5LVALUE
> does. Do you want a way to pass a value to the PMC and let the PMC
> type morph
> itself based on the data representation?

> -Melvin

An lvalue holds usually a function, and when set is called that
function is called. So no morthing required at all!

For example:

perl -le '$foo = hi; $bar = \substr($foo,1); print "$bar-$foo"; $$bar =
"b"; print "$bar-$foo"';
LVALUE(0x513ec)-hi
LVALUE(0x513ec)-hb

so the reference points to a lvalue which has a reference to $bar and a
special function on the set to actually execute the substr.

The reason I am starting with this is that it is so obscure that it is
hardly used anywhere and is limited to a few small areas in the core
making it a good testing ground.

Arthur


 
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