[PATCH] D141150: [DWARFLinker] Rewrite CU DW_AT_low_pc/high_pc pairs into DW_AT_ranges

[Jonas Devlieghere via Phabricator via llvm-commits]

JDevlieghere created this revision.
JDevlieghere added reviewers: aprantl, friss, avl, jasonmolenda.
Herald added subscribers: ormris, steven_wu, hiraditya.
Herald added a project: All.
JDevlieghere requested review of this revision.
Herald added a project: LLVM.

For small gapless programs, clang emits single-value `DW_AT_low_pc/high_pc` in the compile unit. For the debugger, parsing DW_AT_ranges is much faster than having to decode all the compile units. This patch makes the DWARF linker (dsymutil) rewrite DW_AT_low_pc/high_pc pairs into DW_AT_ranges for accelerated access.

rdar://56096523


https://reviews.llvm.org/D141150

Files:
  llvm/lib/DWARFLinker/DWARFLinker.cpp
  llvm/test/tools/dsymutil/ARM/obfuscated.test
  llvm/test/tools/dsymutil/X86/basic-lto-dw4-linking-x86.test
  llvm/test/tools/dsymutil/X86/dead-stripped.cpp
  llvm/test/tools/dsymutil/X86/inlined-static-variable.cpp

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