diff options
Diffstat (limited to 'doc/moosex-compile')
-rw-r--r-- | doc/moosex-compile | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/doc/moosex-compile b/doc/moosex-compile new file mode 100644 index 0000000..7d0a049 --- /dev/null +++ b/doc/moosex-compile @@ -0,0 +1,176 @@ +MooseX-Compile, wherein Yuval explains how MooseX::Compile is supposed to work and what needs doing. + +TODO: PLEASE EDIT ME + +19:11 <obra> hiya +19:12 <nothingmuch> hola +19:13 <obra> so, my empty mail was an attempted abort +19:13 <obra> but was going to be "MX::Compile doesn't depend on MX::Compile::CLI. should it?" +19:13 <nothingmuch> ah, ok =) +19:13 <obra> but i'm without my laptop, so i couldn't actually check my assumption +19:14 <nothingmuch> no, because MX::Compile::CLI is "just a a frontend" and at the time the dependencies were a little sketchy +19:14 <nothingmuch> they've since matured, so maybe it should dep +19:21 * obra nods +19:21 <obra> I was on a plane and was trying to see if MX::Compile was at the point where I could try trivial tests +19:22 <nothingmuch> ah +19:22 <nothingmuch> so the answer is definitely maybe ;-) +19:22 <nothingmuch> i haven't been able to make time for it in the past week +19:23 <nothingmuch> if you guys hand me small, targetted test cases (just commit to it) of code that passes under plain Moose and should pass with MX::Compile i can probably do that stuff pretty quickly +19:23 <nothingmuch> but the biggest barrier MXC has right now is testing, in order for it to progress towards something production worthy it basically needs to pass the Moose test suite +19:23 <nothingmuch> except without the Moose test suite's assumptions +19:23 <nothingmuch> about state and module loading, and all that +19:24 <nothingmuch> and doing that is a much more daunting prospect than hacking on MXC itself +19:24 <obra> understood. the problem is that I still don't have a good sense of how to get it going, even manually +19:24 <nothingmuch> ah +19:24 <obra> none of the test files seem to show off what I need +19:24 <nothingmuch> i can walk you through thjat +19:25 <nothingmuch> the assumptions of the system are: +19:25 <nothingmuch> the class you are compiling is in its own .pm using standard moose sugar +19:25 <nothingmuch> there is one package in that file +19:26 <nothingmuch> the compiler object takes the metaclass and the .pm file as args +19:26 <nothingmuch> it serializes the metaclass to a .mopc file, and the generated code into a .pmc +19:26 <nothingmuch> the .pmc contains the original .pm verbatim +19:26 <nothingmuch> except that all the moose sugar does nothing +19:27 <nothingmuch> meta is overriden to lazy load .mopc +19:27 <nothingmuch> and the class is supposed to be usable without loading Moose at all +19:27 <obra> what is the point of containing the original pm verbatim? +19:27 <nothingmuch> the user code +19:28 <nothingmuch> could open and slurp and eval +19:28 <nothingmuch> but this is a little more flexible +19:28 <nothingmuch> basically any subroutines the user has written, global/lexical variable initialization, loading of assorted modules etc all must work +19:28 <obra> are you using the flexibility? +19:28 <obra> (open, slurp, eval sounds suspiciously like "do") +19:29 <nothingmuch> can't use do/require/etc because it will go to the .pmc +19:29 <nothingmuch> instead of the .pm +19:29 <nothingmuch> the flexibility is helpful because you get a lexical set if the code is compiled +19:29 <nothingmuch> for when you need to do trickery +19:29 <nothingmuch> see Moose/Object.pm +19:29 <obra> I didn't think 'do' had that logic. but ok :) +19:30 <obra> anyway +19:30 <obra> do go on +19:30 <nothingmuch> now that we have Devel::Declare that might prove even simpler +19:30 <nothingmuch> simply replacing has() etc to export the subs inline +19:30 <nothingmuch> and write the resulting buffers to a .pmc +19:30 <nothingmuch> but that's for Laterâ„¢ +19:30 <obra> The fact that the TM shows up in my terminal scare me +19:30 <obra> but only a bit less than that you typed it ;) +19:30 <nothingmuch> utf8++ +19:31 <obra> ubuntu++ +19:31 <nothingmuch> most linuxes seem to get that refreshingly right +19:31 <nothingmuch> so, erm +19:31 <obra> yeah. it's pleasant. +19:31 <nothingmuch> mxcompile +19:31 <obra> anyway +19:31 <nothingmuch> that is a nice frontend to the compiler object +19:31 <obra> I guess "what do I need to do to try MX::Compile for prophet+sd?" +19:31 <nothingmuch> it can recurse through a directory of modules, or take a list of classes +19:31 <nothingmuch> for starters, role support +19:31 <nothingmuch> i know how to do it +19:31 <nothingmuch> but haven't yet +19:32 <nothingmuch> type constraint support is very primitive +19:32 <obra> is that essentially the same code sartak needs to write to give Mouse roles? +19:32 <nothingmuch> i don't know what that is but doesn't sound likely +19:32 <nothingmuch> in MXC moose has already done the role composition +19:32 <nothingmuch> i just need to figure where the data came from, load that file and realias the subs +19:33 <nothingmuch> (at bootstrap time) +19:33 <nothingmuch> no role composition per se +19:33 <nothingmuch> it's nice to make clear that MXC has two "levels" of awesome +19:33 <nothingmuch> so you can figure out what you can hope to achieve +19:34 <nothingmuch> 100% compiled everything means you don't load Moose or Class::MOP +19:34 <nothingmuch> until you need runtime reflection +19:34 <nothingmuch> no codegen at compile time +19:34 <nothingmuch> it should load as fast as hand written code +19:34 <nothingmuch> i've had it beating Object::Tiny in some benchmarks =) +19:35 <obra> oo +19:35 <nothingmuch> Moose::XS should aid in making MooseX::Compile's supported feature set easier +19:35 <nothingmuch> the less awesome level of awesome is just some classes +19:35 <nothingmuch> you don't pay for those classes' compilation (Role composition, etc) +19:35 <obra> (especially since for me perl -MMoose -e1 takes up 50% of "sd help"'s runtime +19:36 <obra> (.4s here) +19:36 <nothingmuch> 5.8.8/ +19:36 <nothingmuch> ? +19:36 <obra> yeah +19:36 <obra> "that's what's in the wild" +19:36 <nothingmuch> i'm just curious if it makes a dfif +19:36 * obra nods +19:36 <obra> I don't have my macbook right now or I'd test +19:36 <nothingmuch> trunk moose loads slower +19:36 <obra> how much slower? +19:36 <nothingmuch> but 5.10 loads faster +19:36 <nothingmuch> negligiably +19:36 <nothingmuch> i think like 10% +19:36 <obra> this was trunk moose as of friday +19:36 <nothingmuch> but we can fix that +19:36 <nothingmuch> ah +19:36 <obra> my tests aren't scientific. +19:36 <nothingmuch> trunk moose as of you sending me nytprofs +19:37 <nothingmuch> actually that's CPAN moose now +19:37 <obra> 0.35 - 0.45 +19:37 <nothingmuch> ouch +19:37 <nothingmuch> well, part of the problem is that it loads *EVERYTHING* +19:37 <nothingmuch> every type of meta method class, meta type constraint, the role system, etc +19:37 <nothingmuch> for a big app these probably will get loaded +19:38 <nothingmuch> but for a small app, especially if you load the various sub modules only as needed, you shouldn't pay for these +19:38 <nothingmuch> that's a trivial fix that perigrin started working on +19:38 <obra> yeah. I played with his branch and saw no change as of last night +19:39 <obra> so yeah, we're using roles. if roles aren't ready yet, I won't get far at all. +19:39 <obra> (Also, I do really appreciate all the work you're doing. That I'm not paying for, even ;) +19:39 <obra> Thank you. +19:39 <nothingmuch> i will try shaving Moose's own load time with a profile based approach +19:39 <obra> It's SO MUCH better than it was +19:39 <nothingmuch> well, everybody wins =) +19:39 <nothingmuch> a. you're a friend +19:40 <nothingmuch> b. part of my job is making Moose work well +19:40 <nothingmuch> c. your using Moose helps moose directly and indirectly +19:40 <nothingmuch> d. I LIKE TACOS +19:40 <nothingmuch> erm, i mean sushi +19:40 <nothingmuch> so no worries on that +19:41 <nothingmuch> so, long term goals: +19:41 <nothingmuch> App::SD etc has all the meta calculations already cached in .mopc and .pmc +19:41 <nothingmuch> moose is not loaded +19:41 <nothingmuch> all generated code is cached +19:41 <nothingmuch> at worst Moose::XS is loaded to install subs with newXS +19:41 <obra> that would be really cool +19:41 <nothingmuch> depending on which actually fairs better +19:42 <nothingmuch> that goal is realistic, but involves a lot of work +19:42 <nothingmuch> more realistic short term goals: +19:42 <obra> I started playing with try to dump the symbol table, etc +19:42 <nothingmuch> MooseX::Compile partly speeding up SD +19:42 <nothingmuch> we can incrementally improve on that +19:42 <obra> and found that DD::Streamer is a lot closer than anything has ever been, but it craps out around not being able to dump lvalue subs +19:43 <nothingmuch> Moose::XS replacing some code gen +19:43 <nothingmuch> yes, the initial approach was to to try and marshall Moose classes into DDS +19:43 <nothingmuch> but it wasn't stable enough +19:43 <nothingmuch> and also there's the problem of imports +19:43 <nothingmuch> you must serialize the whole table at once +19:43 <nothingmuch> or manage an intricate web of inter dependencies +19:43 * obra nods +19:44 <nothingmuch> i sort of work around that by making all the require()/use() statements stay verbatim +19:44 <nothingmuch> also it doesn't handle xsubs +19:44 <obra> how hard would it be to get moose's codegen to write out source code instead of blowing subs into memory? +19:44 <nothingmuch> so there's guesswork for where ::bootstrap was called +19:44 <nothingmuch> i was just getting to that = +19:44 <nothingmuch> =) +19:44 <nothingmuch> pretty trivial +19:44 <obra> heh +19:44 <nothingmuch> just grunt work +19:44 <obra> is that a more viable approach? +19:44 <nothingmuch> it's one of the limiting parts of MooseX::Compile +19:45 <nothingmuch> if we clean up that code it will be easier to add support for more features +19:45 <nothingmuch> but it's not a huge hurdle since it's a very contained problem +19:45 <nothingmuch> it doesn't directly affect the design of MXC +19:45 <obra> is this stuff written down anywhere other than this buffer? +19:45 <nothingmuch> i don't think so +19:46 <obra> where should it get pasted? +19:46 <nothingmuch> good question =) +19:46 <nothingmuch> i think #moose-dev is pretty aware +19:46 <obra> is there a moose wiki? +19:46 <nothingmuch> but documenting is good for people to help out +19:46 <nothingmuch> no, there should be +19:46 <obra> yeah. but the goal is to turn it into written docs. +19:46 <obra> ok. for now, it should end up in MooseX-Compile/doc/design +19:46 <nothingmuch> sounds good +19:46 <obra> . o O { Thank god I don't have a moose commit bit } +19:47 <nothingmuch> though most of this affects moose itself though +19:47 * obra nods +19:47 <obra> Moose/doc/moosex-compile, then |