31f5be4ce5
Add time-trace scopes to the DTLTO-specific input-handling code to improve observability and debugging. These scopes are tested via LLD, as the primary purpose of this code is to support member files of non-thin archives as DTLTO inputs. `llvm-lto2` does not currently support archives. Adding archive support to `llvm-lto2` solely for testing these scopes does not appear to be worthwhile. As part of this change, the deletion of temporary DTLTO input files has been moved. Cleanup now occurs after LTO has completed, rather than during destruction of the LTO object. This is required since by the time the LTO object is destroyed, time-traces have already been finalized, so no additional trace data can be recorded. Recording time-trace data for temporary file deletion is important, as this has been a source of performance issues in the past and an area where we expect to make further performance improvements if supported by the data. SIE internal tracker: TOOLCHAIN-21021
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.