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Fangrui Song ec29538af2 [ELF] Assign file offsets of non-SHF_ALLOC after SHF_ALLOC and set sh_addr=0 to non-SHF_ALLOC 
* GNU ld places non-SHF_ALLOC sections after SHF_ALLOC sections. This has the
  advantage that the file offsets of a non-SHF_ALLOC cannot be contained in
  a PT_LOAD. This patch matches the behavior.
* For non-SHF_ALLOC non-orphan sections, GNU ld may assign non-zero sh_addr and
  treat them similar to SHT_NOBITS (not advance location counter). This
  is an alternative approach to what we have done in D85100.
  By placing non-SHF_ALLOC sections at the end, we can drop special
  cases in createSection and findOrphanPos added by D85100.

  Different from GNU ld, we set sh_addr to 0 for non-SHF_ALLOC sections. 0
  arguably is better because non-SHF_ALLOC sections don't appear in the memory
  image.

ELF spec says:

> sh_addr - If the section will appear in the memory image of a process, this
> member gives the address at which the section's first byte should
> reside. Otherwise, the member contains 0.

D85100 appeared to take a detour. If we take a combined view on D85100 and this
patch, the overall complexity slightly increases (one more 3-line loop) and
compatibility with GNU ld improves.

The behavior we don't want to match is the special treatment of .symtab
.shstrtab .strtab: they can be matched in LLD but not in GNU ld.

Reviewed By: jhenderson, psmith

Differential Revision: https://reviews.llvm.org/D85867
 		2020-08-18 09:03:01 -07:00
..
COFF Revert "Re-Re-land: [CodeView] Add full repro to LF_BUILDINFO record" 2020-08-17 15:49:18 -04:00
Common [lld-macho] Implement -headerpad 2020-07-30 14:29:31 -07:00
ELF [ELF] Assign file offsets of non-SHF_ALLOC after SHF_ALLOC and set sh_addr=0 to non-SHF_ALLOC 2020-08-18 09:03:01 -07:00
MachO [lld-macho] Emit load command LC_BUILD_VERSION 2020-08-14 12:36:43 -07:00
MinGW [LLD] [MinGW] Implement the --no-seh flag 2020-07-28 21:08:37 +03:00
cmake/modules lld: Let find_package(LLD) work 2020-05-14 09:59:53 -04:00
docs Bump the trunk major version to 12 2020-07-15 12:05:05 +02:00
include/lld [lld-macho] Implement -headerpad 2020-07-30 14:29:31 -07:00
lib [CMake] Make `intrinsics_gen` dependency unconditional. 2020-07-17 16:43:17 -07:00
test [ELF] Assign file offsets of non-SHF_ALLOC after SHF_ALLOC and set sh_addr=0 to non-SHF_ALLOC 2020-08-18 09:03:01 -07:00
tools/lld Reland D78837 [lld] Remove special cases from default ld driver mode. 2020-04-29 14:45:44 -07:00
unittests Use INTERFACE_COMPILE_OPTIONS to disable -Wsuggest-override for any target that links to gtest 2020-07-27 08:37:01 -07:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm [lld][WebAssembly] Emit all return types of multivalue functions 2020-08-12 13:14:15 -07:00
.clang-format
…
.clang-tidy [lld] Add .clang-tidy to customize readability-identifier-naming.{Member,Parameter,Variable}Case => camelBack 2020-03-09 08:26:41 -07:00
.gitignore
…
CMakeLists.txt [CMake] Move find_package(ZLIB) to LLVMConfig 2020-07-27 17:13:55 -07:00
CODE_OWNERS.TXT
…
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.md
…

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.