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...deal. Why doesn't getMetadata return an 'MDUser*' for example? In the class hierarchy: - Value -> MDString - Value -> MDNode - Value -> NamedMDNode - Value -> User -> MDUser -> ... I named `MDUser` by its relationship with `User`, but maybe a better name is `CustomMD`? (Any suggestions?) Here's a breakdown: - `MDString` is an arbitrary string that can be used as an operand. It's owned by an `LLVMContext` and treated like a constant. - `MDNode` is a generic node with arbitrary operands. It can itself be used as an operand, and it can be...

I've attached a preliminary patch for `MDLocation` as a follow-up to the RFC [1] last week. It's not commit-ready -- in particular, it squashes a bunch of commits together and doesn't pass `make check` -- but I think it's close enough to indicate the direction and work toward consensus. [1]: http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-October/077715.html IMO, the files to