fc57358efd
4133: main: eagerly prime goto-definition caches r=matklad a=BurntSushi This commit eagerly primes the caches used by goto-definition by submitting a "phantom" goto-definition request. This is perhaps a bit circuitous, but it does actually get the job done. The result of this change is that once RA is finished its initial loading of a project, goto-definition requests are instant. There don't appear to be any more surprise latency spikes. This _partially_ addresses #1650 in that it front-loads the latency of the first goto-definition request, which in turn makes it more predictable and less surprising. In particular, this addresses the use case where one opens the text editor, starts reading code for a while, and only later issues the first goto-definition request. Before this PR, that first goto-definition request is guaranteed to have high latency in any reasonably sized project. But after this PR, there's a good chance that it will now be instant. What this _doesn't_ address is that initial loading time. In fact, it makes it longer by adding a phantom goto-definition request to the initial startup sequence. However, I observed that while this did make initial loading slower, it was overall a somewhat small (but not insignificant) fraction of initial loading time. ----- At least, the above is what I _want_ to do. The actual change in this PR is just a proof-of-concept. I came up with after an evening of printf-debugging. Once I found the spot where this cache priming should go, I was unsure of how to generate a phantom input. So I just took an input I knew worked from my printf-debugging and hacked it in. Obviously, what I'd like to do is make this more general such that it will always work. I don't know whether this is the "right" approach or not. My guess is that there is perhaps a cleaner solution that more directly primes whatever cache is being lazily populated rather than fudging the issue with a phantom goto-definition request. I created this as a draft PR because I'd really like help making this general. I think whether y'all want to accept this patch is perhaps a separate question. IMO, it seems like a good idea, but to be honest, I'm happy to maintain this patch on my own since it's so trivial. But I would like to generalize it so that it will work in any project. My thinking is that all I really need to do is find a file and a token somewhere in the loaded project, and then use that as input. But I don't quite know how to connect all the data structures to do that. Any help would be appreciated! cc @matklad since I've been a worm in your ear about this problem. :-) Co-authored-by: Andrew Gallant <jamslam@gmail.com> |
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rust-analyzer is an experimental modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust. If you want to get involved, check the rls-2.0 working group:
https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Fwg-rls-2.2E0
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If you want to contribute to rust-analyzer or are just curious about how things work under the hood, check the ./docs/dev folder.
If you want to use rust-analyzer's language server with your editor of choice, check the manual folder. It also contains some tips & tricks to help you be more productive when using rust-analyzer.
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See LICENSE-APACHE and LICENSE-MIT for details.