[PATCH] D128211: [DebugInfo][InstrRef][NFC] Handle transfers of variadic debug values in InstrRefLDV

[Stephen Tozer via Phabricator via llvm-commits]

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This patch adds the last of the changes required to enable DBG_VALUE_LIST handling in InstrRefLDV, handling variadic debug values during the transfer tracking step. Most of the changes are fairly straightforward, and based around tracking multiple locations per variable in TransferTracker::VLocTracker. There has also been a significant change in tracking use-before-defs, since we now have to 1) only emit a UseBeforeDef value when all of its values are defined, meaning that we can't just look up whether there is a dependent UseBeforeDef for each instruction as we go along, and 2) when it is time to emit a UseBeforeDef, we have to check that all the values it wants to use are still available - it is possible that one of the required values is killed before all of the values have been defined.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128211

Files:
  llvm/include/llvm/ADT/STLExtras.h
  llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
  llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h

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