[cfe-dev] [clangd] Newcomers guide

[Balogh Tamas via cfe-dev]

Hi Eric,

A possible use case when I would like to analyze a huge C++ project with CodeChecker [1] and use clangd to help me with the jump to definition feature.

So, I am assume that the yml file could be relative big for extremely big projects and in this case I wouldn't want to generate it for all files. It could be generated separately for translation units. And if I am requesting the locations for different definitions from different translation units the index yml file can be dynamically reloaded.

This is just an idea but I hope I formulate it clear and easy to understand.

[1] - https://github.com/Ericsson/codechecker

Best regards,
Tamas

On Jul 31, 2018, at 11:52 AM, Eric Liu <ioeric at google.com> wrote:

+clangd-dev at lists.llvm.org 

Hi Balogh, welcome to clangd! ;)

On Tue, Jul 31, 2018 at 9:46 AM Balogh Tamas via cfe-dev <cfe-dev at lists.llvm.org> wrote:
Hello everyone,

I try to explore clangd, especially clangd - jump to definition but I am bit stuck. I don’t know how to start it.

As far as I know for this feature I need to start clangd with a special ‘index.yml’ file, how can I generate it?
Note that the yaml symbol table is experimental only, but if you want to try it out, you can use global-symbol-builder to generate the yaml symbol table. Eventually, we would like to switch to index-while-build (when it's landed) as a source of clangd symbol data. 

When clangd is running can I change this yml file? Can clangd dynamically reload it?
Currently, the static index (e.g. yaml index on a codebase) is only loaded once in the beginning of a clangd instance. The assumption was that clangd instance is restarted more frequently than the updates of static index. clangd also has dynamic index which indexes the open/active files in a clangd session and acts as an overlay on top of the possibly stale static index. But I can see how reloading static index in clangd can be useful, especially when we have index-while-build in the future. 

I'm interested in your use case for reloading static index. Would you mind elaborating it a bit?

Cheers,
Eric

In default how can I send a request to it?

These are basic questions I know but I didn’t find a detailed documentation for newcomers, so I am really appreciate for any comment. :)

Thank you!

Best regards,
Tamas
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