[all-commits] [llvm/llvm-project] 6b9929: [BOLT] Add fdata symbols mode (#209932)

[Amir Ayupov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6b9929001d0b46d087e871934e50e4783147fa7d
      https://github.com/llvm/llvm-project/commit/6b9929001d0b46d087e871934e50e4783147fa7d
  Author: Amir Ayupov <aaupov at fb.com>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M bolt/docs/profiles.md
    M bolt/include/bolt/Profile/DataReader.h
    M bolt/lib/Profile/DataReader.cpp
    A bolt/test/X86/profile-symbols-mode.s

  Log Message:
  -----------
  [BOLT] Add fdata symbols mode (#209932)

Add a new fdata profile mode accepting symbol names as-is.

It addresses the UX gap surfaced by #208313 that all methods of selecting
functions to process (symbolized profile types, `-funcs*` options) expect
disambiguated local symbols. 

Introduce fdata mode activated by a `symbols` header line, where each subsequent
line is a (mangled) symbol name. The names are matched against restored function
names (with disambiguation suffix stripped), and every matching function gets an
execution count of 1. 

This can be used to drive selective instrumentation (`--instrument-hot-only`) or
basic linker-script style optimizations.

Symbols are stored as branch entry data so matching reuses the existing default
branch profile path.

Test Plan:
Update docs/profiles.md and add profile-symbols-mode.s



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