[all-commits] [llvm/llvm-project] 2d829f: [Debugify] Simplify debugify for locations (#207374)

[Stephen Tozer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2d829f66147850c1fa9cd49c207b40c69aff5f17
      https://github.com/llvm/llvm-project/commit/2d829f66147850c1fa9cd49c207b40c69aff5f17
  Author: Stephen Tozer <stephen.tozer at sony.com>
  Date:   2026-07-08 (Wed, 08 Jul 2026)

  Changed paths:
    M llvm/docs/HowToUpdateDebugInfo.rst
    M llvm/include/llvm/Transforms/Utils/Debugify.h
    M llvm/lib/Transforms/Utils/Debugify.cpp
    M llvm/unittests/Transforms/Utils/DebugifyTest.cpp

  Log Message:
  -----------
  [Debugify] Simplify debugify for locations (#207374)

This patch attempts to improve the performance of debugify for
locations, by relying on coverage tracking to replace most of the
functionality provided via the DILocations map, in exchange for losing
the ability to distinguish between "dropped" and "not-generated" bugs,
and requiring coverage tracking to determine when new bugs appear in a
pass instead of reporting the same bug repeatedly across passes.

This patch is not without cost; the justifications for using it are
that:
- Debugify locations is incredibly expensive; on a local build, without
using any coverage-tracking, this patch takes the build time for sqlite3
down from ~15 minutes to ~10 seconds.
- The difference between "dropped" and "not-generated" is a minor detail
of a bug - besides helping to determine the cause of the bug, which
origin-tracking can do with more accuracy, there's no fundamental
difference in the correctness of either. Furthermore, almost no
"dropped" bugs appear in the compiler anymore (since the debug location
coverage tracker bot has been online).
- Requiring coverage tracking to prevent repeated bugs is a loss, but
coverage tracking is not a very expensive feature to enable compared to
using debugify itself, and the only public automated tests that use
debugify already enable coverage tracking.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications