[PATCH] D28978: [ThinLTO] Add an auto-hide feature

[Mehdi AMINI via Phabricator via llvm-commits]

mehdi_amini created this revision.

when a symbol is not exported outside of the
DSO, it is can be hidden. Usually we try to internalize
as much as possible, but it is not always possible, for
instance a symbol can be referenced outside of the LTO
unit, or there can be cross-module reference in ThinLTO.

I'm still testing this patch, it may a bit rough around
the edges right now.


https://reviews.llvm.org/D28978

Files:
  llvm/include/llvm/IR/ModuleSummaryIndex.h
  llvm/include/llvm/IR/ModuleSummaryIndexYAML.h
  llvm/include/llvm/LTO/LTO.h
  llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
  llvm/lib/LTO/LTO.cpp
  llvm/lib/LTO/ThinLTOCodeGenerator.cpp
  llvm/lib/Transforms/IPO/FunctionImport.cpp
  llvm/test/ThinLTO/X86/Inputs/weak_autohide.ll
  llvm/test/ThinLTO/X86/deadstrip.ll
  llvm/test/ThinLTO/X86/weak_autohide.ll

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