================
@@ -355,6 +351,13 @@ class alignas(8) Decl {
LLVM_PREFERRED_TYPE(Linkage)
mutable unsigned CacheValidAndLinkage : 3;
+ /// The attributes attached to this declaration, or null if it has none.
+ ///
+ /// This pointer is the sole record of whether the declaration has
+ /// attributes, so it must be cleared whenever the vector becomes empty.
+ /// Owned by the ASTContext that allocated it.
+ AttrVec *Attrs = nullptr;
----------------
AaronBallman wrote:
> Would you prefer I collect the sizes of some of the subclasses or are you
> leaning more towards this not being worth the limit on growing the struct
> further?
I think the suggestion from @zygoloid makes a lot of sense to measure (thank
you for that!) and we can go from there if we think more investigation is
needed.
https://github.com/llvm/llvm-project/pull/219138
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