[all-commits] [llvm/llvm-project] 29e859: Reapply "Support SFrame command-line and .cfi_sect...

[Sterling-Augustine via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 29e8599aa9609c1e1bc019d384a96be9333101d8
      https://github.com/llvm/llvm-project/commit/29e8599aa9609c1e1bc019d384a96be9333101d8
  Author: Sterling-Augustine <56981066+Sterling-Augustine at users.noreply.github.com>
  Date:   2025-07-24 (Thu, 24 Jul 2025)

  Changed paths:
    M llvm/include/llvm/MC/MCObjectStreamer.h
    M llvm/include/llvm/MC/MCStreamer.h
    M llvm/include/llvm/MC/MCTargetOptions.h
    M llvm/include/llvm/MC/MCTargetOptionsCommandFlags.h
    M llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
    M llvm/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
    M llvm/lib/MC/MCAsmStreamer.cpp
    M llvm/lib/MC/MCObjectStreamer.cpp
    M llvm/lib/MC/MCParser/AsmParser.cpp
    M llvm/lib/MC/MCStreamer.cpp
    M llvm/lib/MC/MCTargetOptions.cpp
    M llvm/lib/MC/MCTargetOptionsCommandFlags.cpp
    M llvm/test/MC/ELF/AArch64/cfi.s
    M llvm/test/MC/ELF/cfi.s

  Log Message:
  -----------
  Reapply "Support SFrame command-line and .cfi_section syntax (#150316) (#150509)

This reverts commit ad36e4284d66c3609ef8675ef02ff1844bc1951d, fixing a
single uninitialized bit (which cannot be detected with Address
Sanitizer).

This PR adds support for the llvm-mc command-line flag "--gsframe" and
adds ".sframe" to the legal values passed ".cfi_section". It plumbs the
option through the cfi handling code a fair amount. Code to support
actual section generation follows in a future PR.

These options match the gnu-assembler's support syntax for sframes, on
both the command line and in assembly files.

First in a series of changes that will allow llvm-mc to produce sframe
.cfi sections. For more information about sframes, see
https://sourceware.org/binutils/docs-2.44/sframe-spec.html

and the llvm-RFC here:
https://discourse.llvm.org/t/rfc-adding-sframe-support-to-llvm/86900



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