LLVM Binutils BoF 2019 EuroLLVM Developers' Meeting James Henderson - PowerPoint PPT Presentation

Apr 15, 2023 •265 likes •352 views

LLVM Binutils BoF 2019 EuroLLVM Developers' Meeting James Henderson (SN Systems) Jordan Rupprecht (Google) Introduction LLVM binary utilities (aka binutils) include: llvm-readobj/llvm-readelf llvm-objdump llvm-objcopy

LLVM Binutils BoF 2019 EuroLLVM Developers' Meeting James Henderson (SN Systems) Jordan Rupprecht (Google)
Introduction • LLVM binary utilities (aka binutils) include: • llvm-readobj/llvm-readelf • llvm-objdump • llvm-objcopy • llvm-cxxfilt • etc. • Originally used in testing LLVM components: • Approximately 1715 tests in core LLVM (excluding those in the test/tools directory). • More in clang and lld. • Now being used more widely. • See e.g. Jordan’s lightning talk earlier today.
Recent Work • Bug count: • 70 open (170 total) in llvm-ar, llvm-c++filt, llvm-dwarfdump, llvm-nm, llvm-objcopy/strip, llvm- objdump, llvm-ranlib, llvm-readobj, llvm-size, llvm-symbolizer. • 81 resolved between January 2017 and end of March 2019. • GSOC 2018 project by Paul Semel. • https://summerofcode.withgoogle.com/archive/2018/projects/5171359936151552/ • Added features to improve compatibility of LLVM tools with GNU. • llvm-objcopy newly added in summer 2017, gained Mach-O and COFF support in the last 6 months.
Recent Work (2) Commits in tools/<tool> Jan 2017 – March 2019 Tool llvm-ar 44 llvm-cxxfilt 16 llvm-dwarfdump 25 llvm-nm 49 llvm-objcopy 288 llvm-objdump 173 llvm-readobj 277 llvm-size 12 llvm-strings 8 llvm-symbolizer 28 Total 920 Does not include commits in libraries (e.g. DebugInfo, Object, Symbolizer etc).
Command-line Compatibility • Tools should be “drop -in replacements ” with GNU tools. • Does anybody disagree? • What do we mean by this? • Only switches that are widely used are identical? • All switches accepted with the same syntax? • All switches are semantically identical? • Something else? • Is it okay to break compatibility with previous LLVM releases? • We did this for llvm-readelf, but now llvm-readobj and llvm-readelf aren’t directly compatible…
Output Compatibility • How different can the LLVM tool output be to GNU? • E.g. should we support parsers that parse GNU output? • Should we aim to have multi-mode outputs for everything? • See llvm-readobj --elf-output-style={LLVM|GNU} • Is it okay for our output to change between releases?
Future Goals • Any requests for new features beyond existing GNU features? • For example turning llvm-objcopy into a library. • One binary tool to rule them all? • Any new switches? • New output formats? • Anything else? • GSOC 2019 proposal for further work.
Any Other Business • Does anybody have anything else they want to bring up? • What do people want done sooner? • Round table 2pm tomorrow to continue the discussion.

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