ioeric added inline comments.
================
Comment at: clangd/index/SymbolCollector.cpp:260
BasicSymbol = addDeclaration(*ND, std::move(ID));
+ else if (isPreferredDeclaration(OriginalDecl, Roles))
+ BasicSymbol = addDeclaration(OriginalDecl, std::move(ID));
----------------
sammccall wrote:
> This is a bit subtle and I think comment-worthy.
> We're doing a bunch of duplicated work, but at most once because we expect to
> see only one preferred declaration per TU, because in practice they're
> definitions?
>
> An alternative would be to have addDeclaration loop through the redecls to
> try to find a preferred one (and use the passed in one if none is found).
> This would avoid any duplicated work. Up to you.
The reason why I am a bit hesitant to use `redecls` is that we wouldn't know
whether all re-declarations would have been indexed (e.g. there might be
implicit decls that were dropped by the index library) and passed the filters
we had (e.g. `shouldFilterDecl`). And you are right, the duplicated work should
usually be little. I added a comment to clarify the duplicated work.
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D43823
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