DUContext types for source information

Hi,

I'm trying to port the sourceinfo[1] plugin to new APIs, to actually make it 
useful, and I'd appreciate insight into the DUChain.

What I'm trying to do at the moment is draw function parameter names at 
callsites. So far I've tried :

- Creating a new interface that each language plugin could implement to 
provide the ranges of the function arguments. This felt like a lot of work to 
put on various language plugins. And with the language plugin having to rewalk 
its AST specifically for function arguments (I did use IAST), it had a 
discernible delay.

- Creating a DUContext of type Function for arguments at every callsite, with 
all arguments being either Use or another DUContext. I had to hack in Literals 
and implicit conversions as DUContext of type Other. Then I hit passing in an 
address of an object:

> foo ( &value);

I'm stuck on this because AFAIU there is currently no DUChain reason to create 
a cursor/range for '&' (unless it's overloaded).

I'm now thinking of creating a FunctionContext subclass of DUContext which 
would contain a list of Cursors/Ranges that are the entire argument. This is 
about as complex for language plugins as my first approach, but the info is 
already in the DUChain, so at least it should be faster.

To be honest, my preferred approach is #2, but I'm unsure if it's workable.

Any insight would be more than welcome.


Second question : currently the clang plugin includes Template parameters in 
the Function DUContext. Making the pattern of querying the function context 
for all local declarations to get parameters wrong :
> fCtx->localDeclarations(decl->topContext());

This pattern is in the outline plugin, and in the signature assistant, making 
them incorrect for templated functions. 

My first idea is to create a separate Template type DUContext for template 
params. What I do not see is how it gets connected to the function itself.

If anyone with DUChain  knowledge could enlighten me, I'd be very grateful.

Thanks for any comments.

Martin.

[1] https://invent.kde.org/bednar/kdevelop/-/tree/sourceinfo

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