[all-commits] [llvm/llvm-project] 67bd04: [ubsan] Don't merge non-trap handlers if -ubsan-un...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 67bd04facf48206c1e3a4c2664c2240e787bd6af
      https://github.com/llvm/llvm-project/commit/67bd04facf48206c1e3a4c2664c2240e787bd6af
  Author: Thurston Dang <thurston at google.com>
  Date:   2024-12-10 (Tue, 10 Dec 2024)

  Changed paths:
    M clang/lib/CodeGen/CGExpr.cpp
    M clang/test/CodeGen/ubsan-trap-merge.c
    M clang/test/CodeGenCXX/catch-undef-behavior.cpp

  Log Message:
  -----------
  [ubsan] Don't merge non-trap handlers if -ubsan-unique-traps or not optimized (#119302)

UBSan handler calls are sometimes merged by the backend, which complicates debugging. Merging is currently disabled for UBSan traps if -ubsan-unique-traps is specified or if optimization is disabled. This patch applies the same policy to non-trap handler calls.

N.B. "-ubsan-unique-traps" becomes somewhat of a misnomer since it will now apply to non-trap handler calls as well as traps; nonetheless, we keep the naming for backwards compatibility.



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