[PATCH] D27995: Add the ability for DWARFDie objects to get the parent DWARFDie.

[Greg Clayton via Phabricator via llvm-commits]

clayborg created this revision.
clayborg added reviewers: dblaikie, aprantl, probinson, echristo, llvm-commits.
Herald added subscribers: jgosnell, mehdi_amini.

In order for the llvm DWARF parser to be used in LLDB we will need to be able to get the parent of a DIE. This patch adds that functionality by changing the DWARFDebugInfoEntry class to store a depth field instead of a sibling index. Using a depth field allows us to easily calculate the sibling and the parent without increasing the size of DWARFDebugInfoEntry.

I tested llvm-dsymutil on a debug version of clang where this fully parses DWARF in over 1200 .o files to verify there was no serious regression in performance.

Added a full suite of unit tests to test this functionality.


https://reviews.llvm.org/D27995

Files:
  include/llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h
  include/llvm/DebugInfo/DWARF/DWARFDie.h
  include/llvm/DebugInfo/DWARF/DWARFUnit.h
  lib/DebugInfo/DWARF/DWARFDebugInfoEntry.cpp
  lib/DebugInfo/DWARF/DWARFDie.cpp
  lib/DebugInfo/DWARF/DWARFUnit.cpp
  unittests/DebugInfo/DWARF/DWARFDebugInfoTest.cpp

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