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e0c7f081f1
PR #117514 refactored BPSectionOrderer to be used by the ELF port but introduced some inefficiency: * BPSectionBase/BPSymbol are wrappers around a single pointer. The numbers of sections and symbols could be huge, and the extra allocations are memory inefficient. * Reconstructing the returned DenseMap (since BPSectionBase != InputSectin) is wasteful. This patch refactors BPSectionOrderer with Curiously Recurring Template Pattern and eliminates the inefficiency. In addition, `symbolToSectionIdxs` is removed and `rootSymbolToSectionIdxs` building is moved to lld/MachO: while getting sections for symbols is cheap in Mach-O, it is awkward and inefficient in the ELF port. While here, add a file-level comment and replace some `StringMap<*>` (which copies strings) with `DenseMap<CachedHashStringRef, *>`. Pull Request: https://github.com/llvm/llvm-project/pull/124482
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.