batterseapower at hotmail.com
Sat Jan 22 11:29:33 CET 2011
On 21 January 2011 23:59, austin seipp <as at hacks.yi.org> wrote:
> Perhaps Max can
> elaborate on why this design was rejected in favor of the current one,
> so we can see how and where it falls down, and what we really want.
The only reason really is that it added a lot of mechanism. From the
top of my head:
* Parsing etc for PHASE pragmas that declared phase objects
* A new namespace for phases
* Stuff to gather declared phases from all imported modules during compilation
* A built-in phase for each core pass
* A solver that ordered core passes and plugin passes according to the phases
So it was a lot of trouble for relatively little gain. In an effort to
keep the delta against GHC small I threw it out in favour of the much,
much simpler design we have today.
> Thomas pointed out the Scala compiler plugin design document, so I'll
> be sure to read over it this weekend when I get the chance to cook up
The Scala plugins project was just starting when I was working on GHC
plugins so there was no design doc I could refer to at that time.
Thanks for taking the lead on resurrecting plugins, Austin!
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