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## Problem The `safe_thunks` ICF optimization in `lld-macho` was creating thunks that pointed to `InputSection`s instead of `Symbol`s. While, generally, branch relocations can point to symbols or input sections, in this case we need them to point to symbols as subsequently the branch extension algorithm expects branches to always point to `Symbol`'s. ## Solution This patch changes the ICF implementation so that safe thunks point to `Symbol`'s rather than `InputSection`s. ## Testing The existing `arm64-thunks.s` test is modified to include `--icf=safe_thunks` to explicitly verify the interaction between ICF and branch range extension thunks. Two functions were added that will be merged together via a thunk. Before this patch, this test would generate an assert - now this scenario is correctly handled.
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.