c49f83b6e9
removeEmptyPTLoad() removes empty (p_memsz=0) PT_LOAD segments. In assignFileOffsets(), setFileOffset() unnecessarily advances file offsets for containing empty sections. This is exposed by arm Linux kernel's multi_v5_defconfig (see https://bugs.llvm.org/show_bug.cgi?id=45632) ``` ld.lld (max-page-size=65536): [34] .init.data PROGBITS c0c24000 c34000 0128ac 00 WA 0 0 4096 [35] .text_itcm PROGBITS fffe0000 c50000 000000 00 WA 0 0 1 [36] .data_dtcm PROGBITS fffe8000 c58000 000000 00 WA 0 0 1 [37] .data PROGBITS c0c38000 c58000 0647a0 00 WA 0 0 32 arm-linux-gnueabi-ld (max-page-size=65536): [23] .init.data PROGBITS c0c12000 c22000 0128ac 00 WA 0 0 4096 [24] .text_itcm PROGBITS fffe0000 ca2558 000000 00 W 0 0 1 [25] .data_dtcm PROGBITS fffe8000 ca2558 000000 00 W 0 0 1 [26] .data PROGBITS c0c26000 c36000 0647a0 00 WA 0 0 32 ``` This patch clears OutputSection::ptLoad if ptLoad is removed by removeEmptyPTLoad(). Conceptually this removes "dangling" references. Reviewed By: psmith Differential Revision: https://reviews.llvm.org/D79254
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.