[PATCH] D54815: [ThinLTO] Add summary entries for index-based WPD

[Teresa Johnson via Phabricator via llvm-commits]

tejohnson created this revision.
tejohnson added a reviewer: pcc.
Herald added subscribers: arphaman, dexonsmith, steven_wu, eraman, inglorion, Prazek, mehdi_amini.

If LTOUnit splitting is disabled, the module summary analysis computes
the summary information necessary to perform single implementation
devirtualization during the thin link with the index and no IR. The
information collected from the regular LTO IR in the current hybrid WPD
algorithm is summarized, including:

1. For vtable definitions, record the function pointers and their offset

within the vtable initializer (subsumes the information collected from
IR by tryFindVirtualCallTargets).

2. A record for each type metadata summarizing the vtable definitions

decorated with that metadata (subsumes the TypeIdentiferMap collected
from IR).

Also added are the necessary bitcode records, and the corresponding
assembly support.

The index-based WPD will be sent as a follow-on.

Depends on https://reviews.llvm.org/D53890.


Repository:
  rL LLVM

https://reviews.llvm.org/D54815

Files:
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/ModuleSummaryIndex.h
  lib/Analysis/ModuleSummaryAnalysis.cpp
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/AsmParser/LLToken.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/AsmWriter.cpp
  test/Assembler/thinlto-vtable-summary.ll
  test/ThinLTO/X86/cfi-devirt.ll
  tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

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