forked from OSchip/llvm-project
428a7c1b38
ICF previously operated only within a given OutputSection. We would merge all CFStrings first, then merge all regular code sections in a second phase. This worked fine since CFStrings would never reference regular `__text` sections. However, I would like to expand ICF to merge functions that reference unwind info. Unwind info references the LSDA section, which can in turn reference the `__text` section, so we cannot perform ICF in phases. In order to have ICF operate on InputSections spanning multiple OutputSections, we need a way to distinguish InputSections that are destined for different OutputSections, so that we don't fold across section boundaries. We achieve this by creating OutputSections early, and setting `InputSection::parent` to point to them. This is what LLD-ELF does. (This change should also make it easier to implement the `section$start$` symbols.) This diff also folds InputSections w/o checking their flags, which I think is the right behavior -- if they are destined for the same OutputSection, they will have the same flags in the output (even if their input flags differ). I.e. the `parent` pointer check subsumes the `flags` check. In practice this has nearly no effect (ICF did not become any more effective on chromium_framework). I've also updated ICF.cpp's block comment to better reflect its current status. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D105641 |
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| COFF | ||
| Common | ||
| ELF | ||
| MachO | ||
| MinGW | ||
| cmake/modules | ||
| docs | ||
| include/lld | ||
| lib | ||
| test | ||
| tools/lld | ||
| unittests | ||
| utils | ||
| wasm | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| LICENSE.TXT | ||
| 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.