[llvm-dev] Question about visibility analysis for whole program devirtualization pass

Gainullin, Artur via llvm-dev llvm-dev at lists.llvm.org
Thu Nov 30 01:56:23 PST 2017


I have a question about whole program devirtualization pass. According to my understanding devirtualization is performed only for the classes that  have hidden LTO visibility and this visibility is controlled by attributes in the source level or command line options. So visibility analysis is currently performed only in the front-end.  But LLVM has LTO internalization pass that  uses information from the linker to mark symbols as internal if it is possible. Have you ever considered to make an analysis of visibility at this level (after internalization pass)? Or it is not possible for some reasons?

Best regards,
Artur Gainullin

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