[all-commits] [llvm/llvm-project] 16cbb0: [llvm-dwarfdump][LineCov] Add --variable-coverage-...

[unexpectedlydefined via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 16cbb06c5ce1f1632b6d02346147caa17093e788
      https://github.com/llvm/llvm-project/commit/16cbb06c5ce1f1632b6d02346147caa17093e788
  Author: unexpectedlydefined <91391114+unexpectedlydefined at users.noreply.github.com>
  Date:   2026-09-21 (Mon, 21 Sep 2026)

  Changed paths:
    M llvm/docs/CommandGuide/llvm-dwarfdump.md
    M llvm/test/tools/llvm-dwarfdump/X86/Inputs/coverage-opt.ll
    M llvm/test/tools/llvm-dwarfdump/X86/Inputs/coverage.ll
    M llvm/test/tools/llvm-dwarfdump/X86/coverage.test
    M llvm/tools/llvm-dwarfdump/Coverage.cpp
    M llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
    M llvm/tools/llvm-dwarfdump/llvm-dwarfdump.h

  Log Message:
  -----------
  [llvm-dwarfdump][LineCov] Add --variable-coverage-maybe-undefined option (#220855)

This patch adds a `--variable-coverage-maybe-undefined` flag to
llvm-dwarfdump as part of the recently implemented feature that measures
DWARF coverage of local variables in terms of source lines. This causes
the IR-level analysis to consider variables live if they are defined on
any path, and therefore include lines where the variable may be
undefined. By default, variables must be defined on all paths to be
counted.

Additionally, it includes fixes for a few issues found by @SLTozer and
myself after merging the previous patches:
- Variables not present in the DWARF information that appear in the
baseline are now included in the output.
- The assertion that there are no `undef`/`poison` variable locations in
the IR has been removed, as in some circumstances it is possible to have
a `#dbg_declare(poison)` at `-O0`.
- A small error where entries were inserted into the file name map while
iterating through it has been fixed.



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