Sterling-Augustine 29e8599aa9 Reapply "Support SFrame command-line and .cfi_section syntax (#150316) (#150509) ...

This reverts commit ad36e4284d, 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

2025-07-24 14:09:41 -07:00

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