[all-commits] [llvm/llvm-project] 5d4c44: [rtsan] Handle attributed IR function declarations...

[davidtrevelyan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5d4c4411f13755d5f12a83a0d6705e8501f33d5f
      https://github.com/llvm/llvm-project/commit/5d4c4411f13755d5f12a83a0d6705e8501f33d5f
  Author: davidtrevelyan <davidtrevelyan at users.noreply.github.com>
  Date:   2025-12-01 (Mon, 01 Dec 2025)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/RealtimeSanitizer.cpp
    A llvm/test/Instrumentation/RealtimeSanitizer/rtsan_attrib_declare.ll

  Log Message:
  -----------
  [rtsan] Handle attributed IR function declarations (#169577)

Addresses https://github.com/llvm/llvm-project/issues/169377.

Previously, the RealtimeSanitizer pass only handled attributed function
_definitions_ in IR, and we have recently found that attributed function
_declarations_ caused it to crash. To fix the issue, we must check
whether the IR function is empty before attempting to do any
manipulation of its instructions.

This PR:

- Adds checks for whether IR `Function`s are `empty()` ~~in each
relevant~~ at the top-level RTSan pass routine
- ~~Removes the utility function `rtsanPreservedCFGAnalyses` from the
pass, whose result was unused and which would otherwise have complicated
the fix~~



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