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llvm / lld / ff54d4faecc1687516d1ae1e3d81a9c9d238123d
commitff54d4faecc1687516d1ae1e3d81a9c9d238123d[log] [tgz]
authorPeter Collingbourne <peter@pcc.me.uk>Mon Sep 30 20:23:00 2019 +0000
committerPeter Collingbourne <peter@pcc.me.uk>Mon Sep 30 20:23:00 2019 +0000
treef1b14b4f913339978a8e3a6c1d0146f63abfa25e
parent49042c57ce1b49a303adc0ed2ccc1b1763cfe0bc [diff]
ELF: Don't merge SHF_LINK_ORDER sections for different output sections in relocatable links.

Merging SHF_LINK_ORDER sections can affect semantics if the sh_link
fields point to different sections.

Specifically, for SHF_LINK_ORDER sections, the sh_link field acts as a reverse
dependency from the linked section, causing the SHF_LINK_ORDER section to
be included if the linked section is included. Merging sections with different
sh_link fields will cause the entire contents of the SHF_LINK_ORDER section
to be associated with a single (arbitrarily chosen) output section, whereas the
correct semantics are for the individual pieces of the SHF_LINK_ORDER section
to be associated with their linked output sections. As a result we can end up
incorrectly dropping SHF_LINK_ORDER section contents or including the wrong
section contents, depending on which linked sections were chosen.

Differential Revision: https://reviews.llvm.org/D68094

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@373255 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
tree: f1b14b4f913339978a8e3a6c1d0146f63abfa25e
  1. cmake/
  2. COFF/
  3. Common/
  4. docs/
  5. ELF/
  6. include/
  7. lib/
  8. MinGW/
  9. test/
  10. tools/
  11. unittests/
  12. utils/
  13. wasm/
  14. .arcconfig
  15. .clang-format
  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.