john.brawn marked an inline comment as done.
john.brawn added inline comments.
================
Comment at: clang/lib/Basic/Attributes.cpp:101-103
+ for (ParsedAttrInfoRegistry::iterator it = ParsedAttrInfoRegistry::begin(),
+ ie = ParsedAttrInfoRegistry::end();
+ it != ie; ++it) {
----------------
aaron.ballman wrote:
> Range-based for loop? Also, `it` and `ie` don't meet the usual naming
> conventions.
>
> One thing I'm not keen on with this is the performance hit. We spent a decent
> amount of effort making this lookup fast and it's now a linear search through
> all of the attributes and requires memory allocations and deallocations to
> perform the search.
Yes, I've done some experiments and in the pathological case (lots of trivial
functions with the xray_log_args attribute) the slowdown is noticeable. I've
done some tinkering and I think the best way to resolve this is to first use a
generated function (i.e. something like the current getAttrKind) to look up the
attributes that are compiled into clang, then if that fails look in the
registry to find a match.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D31338/new/
https://reviews.llvm.org/D31338
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