[all-commits] [llvm/llvm-project] a4610c: [BOLT][DWARF] Add support for DW_IDX_parent (#85285)

[Alexander Yermolovich via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a4610c7182d35093e9e0fde5be91659a8b9da5b8
      https://github.com/llvm/llvm-project/commit/a4610c7182d35093e9e0fde5be91659a8b9da5b8
  Author: Alexander Yermolovich <43973793+ayermolo at users.noreply.github.com>
  Date:   2024-03-15 (Fri, 15 Mar 2024)

  Changed paths:
    M bolt/include/bolt/Core/DIEBuilder.h
    M bolt/include/bolt/Core/DebugNames.h
    M bolt/lib/Core/DIEBuilder.cpp
    M bolt/lib/Core/DebugNames.cpp
    M bolt/test/X86/dwarf5-debug-names-generate-debug-names.test
    M bolt/test/X86/dwarf5-debug-names.test
    M bolt/test/X86/dwarf5-df-debug-names-generate-debug-names.test
    M bolt/test/X86/dwarf5-df-debug-names.test
    M bolt/test/X86/dwarf5-df-main-debug-names-ftu-ltu-mix.test
    M bolt/test/X86/dwarf5-df-one-cu-debug-names.test
    M bolt/test/X86/dwarf5-df-types-debug-names.test
    M bolt/test/X86/dwarf5-df-types-one-cu-debug-names.test
    M bolt/test/X86/dwarf5-one-cu-debug-names.test
    M bolt/test/X86/dwarf5-types-debug-names.test
    M bolt/test/X86/dwarf5-types-one-cu-debug-names.test

  Log Message:
  -----------
  [BOLT][DWARF] Add support for DW_IDX_parent (#85285)

This adds support for DW_IDX_parent. If DIE has a parent then
DW_IDX_parent in Entry will point to Entry for that parent DIE.
Otherwise it will have DW_FORM_flag_present in abbrev. Which takes zero
space in Entry.

This came from

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



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