[all-commits] [llvm/llvm-project] 91f4a8: [lldb][DWARFIndex] Use IDX_parent to implement Get...

[Felipe de Azevedo Piovezan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 91f4a84a1504e718e4f4d4eef5db7713dc30a030
      https://github.com/llvm/llvm-project/commit/91f4a84a1504e718e4f4d4eef5db7713dc30a030
  Author: Felipe de Azevedo Piovezan <fpiovezan at apple.com>
  Date:   2024-02-13 (Tue, 13 Feb 2024)

  Changed paths:
    M lldb/source/Plugins/SymbolFile/DWARF/DWARFDeclContext.h
    M lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp
    M lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.h
    M lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
    M lldb/unittests/SymbolFile/DWARF/CMakeLists.txt
    A lldb/unittests/SymbolFile/DWARF/DWARFDebugNamesIndexTest.cpp

  Log Message:
  -----------
  [lldb][DWARFIndex] Use IDX_parent to implement GetFullyQualifiedType query (#79932)

This commit changes DebugNamesDWARFIndex so that it now overrides
`GetFullyQualifiedType` and attempts to use DW_IDX_parent, when
available, to speed up such queries. When this type of information is
not available, the base-class implementation is used.

With this commit, we now achieve the 4x speedups reported in [1].

[1]:
https://discourse.llvm.org/t/rfc-improve-dwarf-5-debug-names-type-lookup-parsing-speed/74151/38