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53eb7fda51
Previously, we only supported binding dysyms to the GOT. This diff adds support for binding them to any arbitrary section. C++ programs appear to use this, I believe for vtables and type_info. This diff also makes our bind opcode encoding a bit smarter -- we now encode just the differences between bindings, which will make things more compact. I was initially concerned about the performance overhead of iterating over these relocations, but it turns out that the number of such relocations is small. A quick analysis of my llvm-project build directory showed that < 1.3% out of ~7M relocations are RELOC_UNSIGNED bindings to symbols (including both dynamic and static symbols). Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83103
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.