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

[Gainullin, Artur via llvm-dev]

Hi!
Will appreciate any comments regarding this question.

Best regards,
Artur Gainullin

From: Gainullin, Artur
Sent: Thursday, November 30, 2017 10:56 AM
To: peter at pcc.me.uk
Cc: llvm-dev at lists.llvm.org
Subject: Question about visibility analysis for whole program devirtualization pass

Hi!

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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