[PATCH] D40917: Emit .debug$H section in clang

[Zachary Turner via Phabricator via llvm-commits]

zturner created this revision.
Herald added subscribers: JDevlieghere, hiraditya, mgorny.

This causes emission of .debug$H section unconditionally when `-gcodeview` is present.

I ran some benchmarks on a self-hosted build and found a ~2% increase in overall build time (within the margin of error, so basically noise), and a ~15% increase in object file size, on average.

Currently the linker doesn't use this, that will work will come in a followup patch.  For now, we're just testing that clang emits it correctly with some obj2yaml and llc based tests.


https://reviews.llvm.org/D40917

Files:
  llvm/include/llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h
  llvm/include/llvm/DebugInfo/CodeView/TypeHashing.h
  llvm/include/llvm/MC/MCObjectFileInfo.h
  llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
  llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h
  llvm/lib/DebugInfo/CodeView/CMakeLists.txt
  llvm/lib/DebugInfo/CodeView/GlobalTypeTableBuilder.cpp
  llvm/lib/MC/MCObjectFileInfo.cpp
  llvm/lib/ObjectYAML/CodeViewYAMLTypeHashing.cpp
  llvm/test/DebugInfo/COFF/global-type-hashes.ll
  llvm/test/DebugInfo/COFF/globals.ll

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