v.g.vassilev added a comment.

In D96033#2695748 <https://reviews.llvm.org/D96033#2695748>, @rjmccall wrote:

> In D96033#2695622 <https://reviews.llvm.org/D96033#2695622>, @v.g.vassilev 
> wrote:
>
>> Would it make sense to have each `Decl` point to its owning PTU, similarly 
>> to what we do for the owning module (`Decl::getOwningModule`)?
>
> I think that's the interface we want, but actually storing the PTU in every 
> `Decl` that way is probably prohibitive in memory overhead; we need some more 
> compact way to recover it.  But maybe it's okay to do something like that if 
> we can spare a bit in `Decl`.  Richard, thoughts here?

Ha, each `Decl` has a `getTranslationUnitDecl()` which may be rewired to point 
to the PTU...

>> In terms of future steps, do you prefer to try implementing what you 
>> suggested as part of this patch? I would prefer to land this patch and then 
>> add what we discussed here rather than keep piling to this already bulky 
>> patch.
>
> It depends on how much you think your patch is working towards that 
> architecture.  Since this is just infrastructure without much in the way of 
> Sema/IRGen changes, it's probably fine.  I haven't reviewed it yet, though, 
> sorry.

If you could skim through the patch it'd be great! I think the only bit that 
remotely touches on the new architecture is the `Transaction` class -- it is a 
pair of vector of decls and an llvm::Module. I think the vector of Decls would 
become a PTU in future.


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