[ELF] Omit zero-range FDEs from .eh_frame_hdr (#220492)

A zero-sized function (e.g. only `__builtin_unreachable()` in the body
when not using -trap-unreachable) shares its address with the next
function, and its zero-range FDE can win the uniquify step, leaving the
next real function impossible to unwind.

Fix #218124 by dropping FDEs with a zero PC range from the search table.

GitOrigin-RevId: 4be38a0764ec87dfb1e1cef5325bbd1df9767d63
7 files changed
tree: 2740b37b916d1c8414c6dd16aeb390c2066f27fb
  1. cmake/
  2. COFF/
  3. Common/
  4. docs/
  5. ELF/
  6. include/
  7. MachO/
  8. MinGW/
  9. test/
  10. tools/
  11. unittests/
  12. utils/
  13. wasm/
  14. .clang-format
  15. .clang-tidy
  16. .gitignore
  17. CMakeLists.txt
  18. LICENSE.TXT
  19. Maintainers.md
  20. README.md
README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.