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James Henderson e1689689d8 [ELF] Compress debug sections after assignAddresses and support custom layout 
Previously, in r320472, I moved the calculation of section offsets and sizes
for compressed debug sections into maybeCompress, which happens before
assignAddresses, so that the compression had the required information. However,
I failed to take account of relocations that patch such sections. This had two
effects:

1. A race condition existed when a debug section referred to a different debug
section (see PR35788).
2. References to symbols in non-debug sections would be patched incorrectly.
This is because the addresses of such symbols are not calculated until after
assignAddresses (this was a partial regression caused by r320472, but they
could still have been broken before, in the event that a custom layout was used
in a linker script).

assignAddresses does not need to know about the output section size of
non-allocatable sections, because they do not affect the value of Dot. This
means that there is no longer a reason not to support custom layout of
compressed debug sections, as far as I'm aware. These two points allow for
delaying when maybeCompress can be called, removing the need for the loop I
previously added to calculate the section size, and therefore the race
condition. Furthermore, by delaying, we fix the issues of relocations getting
incorrect symbol values, because they have now all been finalized.

llvm-svn: 321986
 		2018-01-08 10:17:03 +00:00
..
COFF [COFF] Initalize ErrorHandler with CanExitEarly value 2018-01-08 05:58:36 +00:00
Common Add a missing build dependency. 2017-12-14 22:31:29 +00:00
ELF [ELF] Compress debug sections after assignAddresses and support custom layout 2018-01-08 10:17:03 +00:00
MinGW [MinGW] Ignore the --no-seh flag 2017-12-15 20:53:10 +00:00
cmake/modules [lld] Switch to add_llvm_install_targets 2017-12-01 04:17:45 +00:00
docs Docs, release notes: update version to 7.0.0 2018-01-03 15:51:31 +00:00
include/lld Prefer `ArrayRef` over `const std::vector&` 2017-12-08 01:09:21 +00:00
lib [YAML] Fix mustQuote return type changed in r320996 2017-12-18 17:49:27 +00:00
test [ELF] Compress debug sections after assignAddresses and support custom layout 2018-01-08 10:17:03 +00:00
tools/lld [CMake] Use PRIVATE in target_link_libraries for executables 2017-12-05 21:49:56 +00:00
unittests [CMake] Use PRIVATE in target_link_libraries for executables 2017-12-05 21:49:56 +00:00
utils Add a script to run various benchmarks and send the result to lnt. 2017-11-14 16:40:30 +00:00
wasm [WebAssmebly] Fix references to weak aliases 2017-12-21 02:43:39 +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 Update copyright year to 2016. 2016-03-30 22:40:59 +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.