[all-commits] [llvm/llvm-project] fd4c4e: [libc] Add `returns_twice` attribute to `setjmp(3)...

[Alan Zhao via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fd4c4ed712c14ab80979bcdca121387d83a465ff
      https://github.com/llvm/llvm-project/commit/fd4c4ed712c14ab80979bcdca121387d83a465ff
  Author: Alan Zhao <ayzhao at google.com>
  Date:   2025-02-05 (Wed, 05 Feb 2025)

  Changed paths:
    M libc/include/__llvm-libc-common.h
    M libc/include/setjmp.yaml
    M libc/src/setjmp/setjmp_impl.h

  Log Message:
  -----------
  [libc] Add `returns_twice` attribute to `setjmp(3)` (#124370)

This is to ensure that calls to `setjmp(3)` result in correct code
generation that respects `setjmp(3)`'s `returns_twice` behavior.
Otherwise, we might run into bugs (for example, Clang may perform
tail-call optimization on this function if `-fno-builtins` is set
(#122840)).

---------

Co-authored-by: Nick Desaulniers <nick.desaulniers at gmail.com>



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