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Re: Make built-in list functions continuous

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Nicholas Clark
April 6, 2008 04:21
Re: Make built-in list functions continuous
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On Tue, Apr 01, 2008 at 11:38:24PM -0400, wren argetlahm wrote:

> Fair enough. I knew the optree stuff was hairy, though I didn't expect 
> it to be quite that hairy. If there aren't any hooks to apply 
> transformations prior to only having the opcodes, that severely limits 
> the options. For someone familiar with the Filter modules and familiar 
> enough with Perl to reinvent the grammars for the lexer/parser, that 
> could be another avenue for proof of concept and debugging.

I forgot. Larry's MAD (Misc Attribute Decoration) which is in 5.10.0
(but described as "still in development") gives an XML dump of a program
sufficient to recreate the source perfectly. I think that he's said that
effectively it (or one of its post-processors) is able to create the AST
for a Perl 5 program, despite no such thing really actually existing inside
the perl interpreter at any point.

That might be good enough to allow correct re-writing. But it sounds like it
would not be trivial at all to it during the loading of a Perl source file
from disk. To do it all in one sounds like it needs a source filter
implementation that forks out to another perl running in MAD mode, feed your
source file to that, then a post process on the output of MAD, and then feed
*that* back in, in place of the file you first were reading.

Nicholas Clark

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