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llvm / llvm-project / lld / ea1e73452d8258a8de2dbbfe0f8210fa31fb4b56
commitea1e73452d8258a8de2dbbfe0f8210fa31fb4b56[log] [tgz]
authorFangrui Song <i@maskray.me>Tue Jan 23 11:38:15 2024 -0800
committerCopybara-Service <copybara-worker@google.com>Tue Jan 23 11:39:56 2024 -0800
tree00aecfa4e065a5bc728b30baa2be51301ed38010
parent79d34bb7a877627c478e3b2f7c20142ba1af0539 [diff]
[ELF] --save-temps --lto-emit-asm: derive ELF/asm file names from bitcode file names

Port COFF's https://reviews.llvm.org/D78221 and
https://reviews.llvm.org/D137217 to ELF. For the in-process ThinLTO
link, `ld.lld --save-temps a.o d/b.o -o out` will create
ELF relocatable files `out.lto.a.o`/`d/out.lto.b.o` instead of
`out1.lto.o`/`out2.lto.o`. Deriving the LTO-generated relocatable file
name from bitcode file names helps debugging.

The relocatable file name from the first regular LTO partition does not
change: `out.lto.o`. The second, if present due to `--lto-partition=`,
changes from `out1.lto.o` to `lto.1.o`.

For an archive member, e.g. `d/a.a(coll.o at 8)`,
the relocatable file is `d/out.lto.a.a(coll.o at 8).o`.

`--lto-emit-asm` file names are changed similarly. `--lto-emit-asm -o
out` now creates `out.lto.s` instead of `out`, therefore the
`--lto-emit-asm -o -` idiom no longer works. However, I think this new
behavior (which matches COFF) is better since keeping or removing
`--lto-emit-asm` will dump different files, instead of overwriting the
`-o` output file from an executable/shared object to an assembly file.

Reviewers: rnk, igorkudrin, xur-llvm, teresajohnson, ZequanWu

Reviewed By: teresajohnson

Pull Request: https://github.com/llvm/llvm-project/pull/78835

GitOrigin-RevId: f7669ba3d9443bc95dd63fa25beea13e6265fdc5
14 files changed
tree: 00aecfa4e065a5bc728b30baa2be51301ed38010
  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. CODE_OWNERS.TXT
  19. LICENSE.TXT
  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.