[PATCH] D159374: [llvm][dwarf][rfc][donotcommit] Enable print of ranges addresses from .debug_info.dwo

[Alexander Yermolovich via Phabricator via llvm-commits]

ayermolo created this revision.
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For split dwarf some of the sections remain in the main binary. For DWARF4 it's
.debug_ranges, .debug_addr. For DWARF5 it's .debug_addr. When using
llvm-dwarfdump on .dwo/.dwp files this results in not being able to see what ranges
and addresses for DW_AT_low_pc are used in DIEs, and output having "Error: " in it.

I added a new option --main-binary=<binary> that will create a link in
DWARFContext between DWO context and main binary. This allows tool to display
addresses for DW_AT_ranges and DW_AT_low_pc.

Example (DWARF5):
DW_TAG_inlined_subroutine
	DW_AT_abstract_origin (0x00000b21 "flush_RL")

  DW_AT_ranges  (indexed (0x0) rangelist = 0x00000054
  	[0x0000000000403fe2, 0x0000000000403ff3)
    [0x0000000000403ff6, 0x0000000000403ffe))

DW_TAG_subprogram

  DW_AT_low_pc  (0x0000000000403940)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159374

Files:
  llvm/include/llvm/DebugInfo/DWARF/DWARFContext.h
  llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
  llvm/lib/DebugInfo/DWARF/DWARFUnit.cpp
  llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp

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