@swift-ci create

Comment by Rajagopalan Gangadharan (JIRA)

theindigamer (JIRA User) This looks interesting, may I work on this? - if yes please do give me some pointer on where I can get started.

(I'm not sure if implementing this is a good idea right now but) The very high-level idea would be:

• Figure out a place in the pipeline where the layouts are already computed. E.g. layout information is needed for LLVM IR, so this information should be available when the compiler mode corresponds to -emit-irgen or later.

• At this point, you need to somehow traverse the different nominal type declarations in the module, then I believe you'd need to do a mapping NominalTypeDecl -> Type -> SILType -> TypeInfo -> TypeLayoutEntry. I believe the TypeLayoutEntry values are the "final" form having all the details about layout, but not 100% sure about this.

You'll see some methods on TypeConverter such as convertType and methods on IRGenModule such as getStorageType, those seem to be relevant. You'll also see a TypeLayoutCache which has methods doing the last part, mapping SILType and TypeInfo values to TypeLayoutEntry} values.

That said, I'm not entirely sure what the cleanest way to get this information out would be.

cc aschwaighofer@apple.com (JIRA User) do you have suggestions here?

Comment by Rajagopalan Gangadharan (JIRA)

theindigamer (JIRA User) thank you for the info, looks a bit complicated for my current knowledge set I guess. Let me stick with few more starter bugs before doing this. Thank you and sorry!

No worries. 🙂 What I have written down could be potentially useful to someone else too in the future.