[PATCH] D59790: [DebugInfo][Docs] Document how variable location metadata is transformed through target codegen

[Bjorn Pettersson via Phabricator via llvm-commits]

bjope added a comment.

Nice!

One more thing that could be described (not neccessarily in this patch):

- dbg.declare is removed by ISel and the information is squirreled away in a table in the MachineFunction. Later `DwarfDebug::collectVariableInfoFromMFTable `is fetching the debug info using `MF->getVariableDbgInfo()`. That kind of explains why there is no DBG_DECLARE meta instruction, or any DBG_VALUE instructions when using -O0, which otherwise could be a mystery for someone not familiar with that part.


Repository:
  rL LLVM

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  https://reviews.llvm.org/D59790/new/

https://reviews.llvm.org/D59790