[PATCH] D75929: [DebugInfo] Support DWARFv5 index sections.

[David Blaikie via Phabricator via llvm-commits]

dblaikie added a comment.

> This is almost what you are doing right now -- the only difference is that the "internal" enum would no longer be internal -- it would actually match the on-disk format of a v5 index. This v5 enum would contain the official DWARFv5 constants as well as the new extensions we want to introduce for mixed 5+4 indices.

Yep, this would be the direction I would suggest/encourage. It seems that if the goal is to have one index in a DWP file (which seems reasonable) then all future index versions will have to support column indexes all previous DWARF sections - the DWARFvN enum can then be used to describe all the previous versions as well.

All we'd do is store a "what's the highest DWARF version we have seen in parsing all the inputs (either input CUs in .dwo files, or input cu_indexes in .dwp files)" and use that number to determine what version index we produce (& knowing that those inputs can only contain the limited columns expressable in that DWARF/index version, so we won't have undescribable columns in our internal representation when we're going to emit the index).


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  https://reviews.llvm.org/D75929/new/

https://reviews.llvm.org/D75929