[all-commits] [llvm/llvm-project] 9459c8: [KeyInstr][Clang] Add ApplyAtomGroup (#134632)

[Orlando Cazalet-Hyams via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9459c8309c6768cf6aa7956885b2540e16582a93
      https://github.com/llvm/llvm-project/commit/9459c8309c6768cf6aa7956885b2540e16582a93
  Author: Orlando Cazalet-Hyams <orlando.hyams at sony.com>
  Date:   2025-05-21 (Wed, 21 May 2025)

  Changed paths:
    M clang/lib/CodeGen/CGDebugInfo.cpp
    M clang/lib/CodeGen/CGDebugInfo.h
    M clang/lib/CodeGen/CodeGenFunction.cpp
    M clang/lib/CodeGen/CodeGenFunction.h

  Log Message:
  -----------
  [KeyInstr][Clang] Add ApplyAtomGroup (#134632)

This is a scoped helper similar to ApplyDebugLocation that creates a new source
location atom group which instructions can be added to.

A source atom is a source construct that is "interesting" for debug stepping
purposes. We use an atom group number to track the instruction(s) that implement
the functionality for the atom, plus backup instructions/source locations.

This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.

RFC:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668

The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.



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