[PATCH] D18763: [ThinLTO] Move summary computation from BitcodeWriter to new pass

[Teresa Johnson via llvm-commits]

tejohnson created this revision.
tejohnson added a reviewer: joker.eph.
tejohnson added a subscriber: llvm-commits.
Herald added a subscriber: joker.eph.

This is the first step in also serializing the index out to LLVM
assembly.

The per-module summary written to bitcode is moved out of the bitcode
writer and to a new analysis pass (ModuleSummaryIndexWrapperPass).
The pass itself uses a new builder class to compute index, and the
builder class is used directly in places where we don't have a pass
manager (e.g. llvm-as).

Because we are computing summaries outside of the bitcode writer, we no
longer can use value ids created by the bitcode writer's
ValueEnumerator. This required changing the reference graph edge type
to use a new ValueInfo class holding a union between a GUID (combined
index) and Value* (permodule index). The Value* are converted to the
appropriate value ID during bitcode writing.

There are a couple of NFC changes in here that I will commit separately
ahead of time (e.g. new getGlobalValueInfo() helper method).

http://reviews.llvm.org/D18763

Files:
  include/llvm/Analysis/ModuleSummaryAnalysis.h
  include/llvm/Bitcode/ReaderWriter.h
  include/llvm/IR/ModuleSummaryIndex.h
  include/llvm/InitializePasses.h
  lib/Analysis/Analysis.cpp
  lib/Analysis/CMakeLists.txt
  lib/Analysis/ModuleSummaryAnalysis.cpp
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/Bitcode/Writer/BitcodeWriterPass.cpp
  lib/Bitcode/Writer/LLVMBuild.txt
  lib/IR/ModuleSummaryIndex.cpp
  lib/LTO/ThinLTOCodeGenerator.cpp
  lib/Transforms/IPO/FunctionImport.cpp
  tools/llvm-as/CMakeLists.txt
  tools/llvm-as/LLVMBuild.txt
  tools/llvm-as/llvm-as.cpp
  tools/llvm-lto/llvm-lto.cpp

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