History

Fangrui Song 210949a221 [ELF] Change GOT_FROM_END (relative to end(.got)) to GOTPLT (start(.got.plt)) Summary: This should address remaining issues discussed in PR36555. Currently R_GOT_FROM_END are exclusively used by x86 and x86_64 to express relocations types relative to the GOT base. We have _GLOBAL_OFFSET_TABLE_ (GOT base) = start(.got.plt) but end(.got) != start(.got.plt) This can have problems when _GLOBAL_OFFSET_TABLE_ is used as a symbol, e.g. glibc dl_machine_dynamic assumes _GLOBAL_OFFSET_TABLE_ is start(.got.plt), which is not true. extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden; return _GLOBAL_OFFSET_TABLE_[0]; // R_X86_64_GOTPC32 In this patch, we Change all GOT_FROM_END to GOTPLT to fix the problem. * Add HasGotPltOffRel to denote whether .got.plt should be kept even if the section is empty. * Simplify GotSection::empty and GotPltSection::empty by setting HasGotOffRel and HasGotPltOffRel according to GlobalOffsetTable early. The change of R_386_GOTPC makes X86::writePltHeader simpler as we don't have to compute the offset start(.got.plt) - Ebx (it is constant 0). We still diverge from ld.bfd (at least in most cases) and gold in that .got.plt and .got are not adjacent, but the advantage doing that is unclear. Reviewers: ruiu, sivachandra, espindola Subscribers: emaste, mehdi_amini, arichardson, dexonsmith, jdoerfert, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59594 llvm-svn: 356968		2019-03-25 23:46:19 +00:00
..
COFF	[LLD][COFF] Separate module descriptors creation from type/symbol merging	2019-03-22 22:07:27 +00:00
Common	Fail early if an output file is not writable	2019-03-11 16:30:55 +00:00
ELF	[ELF] Change GOT_FROM_END (relative to end(.got)) to GOTPLT (start(.got.plt))	2019-03-25 23:46:19 +00:00
MinGW	[MinGW] Hook up the --exclude-all-symbols option	2019-02-19 21:57:49 +00:00
cmake/modules	[CMake] Properly conditionalize installation of lld libraries	2018-03-09 13:09:36 +00:00
docs	Reland "[Remarks] Add -foptimization-record-passes to filter remark emission"	2019-03-12 21:22:27 +00:00
include/lld	Fail early if an output file is not writable	2019-03-11 16:30:55 +00:00
lib	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
test	[ELF] Change GOT_FROM_END (relative to end(.got)) to GOTPLT (start(.got.plt))	2019-03-25 23:46:19 +00:00
tools/lld	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
unittests	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
utils	Python 2/3 compatibility	2019-03-20 07:42:13 +00:00
wasm	Revert "[WebAssembly] Add linker options to control feature checking"	2019-03-25 18:10:26 +00:00
.arcconfig	[lld] Set up .arcconfig to point to new Diffusion LLD repository	2017-12-06 20:56:23 +00:00
.clang-format	…
.gitignore	…
CMakeLists.txt	[WebAssembly] Initial wasm linker implementation	2017-11-17 18:14:09 +00:00
CODE_OWNERS.TXT	[WebAssembly] Initial wasm linker implementation	2017-11-17 18:14:09 +00:00
LICENSE.TXT	Fix typos throughout the license files that somehow I and my reviewers	2019-01-21 09:52:34 +00:00
README.md	Note that the test .tar.xz has been updated.	2017-12-22 19:37:32 +00:00

README.md

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.