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Peter Smith 96ca4f5e91 [ELF] Remove Duplicate .ARM.exidx sections 
The ARM.exidx section contains a table of 8-byte entries with the first
word of each entry an offset to the function it describes and the second
word instructions for unwinding if an exception is thrown from that
function. The SHF_LINK_ORDER processing will order the table in ascending
order of the functions described by the exception table entries. As the
address range of an exception table entry is terminated by the next table
entry, it is possible to merge consecutive table entries that have
identical unwind instructions.

For this implementation we define a table entry to be identical if:
- Both entries are the special EXIDX_CANTUNWIND.
- Both entries have the same inline unwind instructions.
We do not attempt to establish if table entries that are references to
.ARM.extab sections are identical.

This implementation works at a granularity of a single .ARM.exidx
InputSection. If all entries in the InputSection are identical to the
previous table entry we can remove the InputSection. A more sophisticated
but more complex implementation would rewrite InputSection contents so that
duplicates within a .ARM.exidx InputSection can be merged.

Differential Revision: https://reviews.llvm.org/D40967

llvm-svn: 320803
 		2017-12-15 11:09:41 +00:00
..
COFF [COFF] Warn for locally imported symbols 2017-12-15 07:49:21 +00:00
Common Add a missing build dependency. 2017-12-14 22:31:29 +00:00
ELF [ELF] Remove Duplicate .ARM.exidx sections 2017-12-15 11:09:41 +00:00
MinGW Add missing reference to lldCommon in MinGW/CMakeLists.txt 2017-12-13 20:39:02 +00:00
cmake/modules [lld] Switch to add_llvm_install_targets 2017-12-01 04:17:45 +00:00
docs [docs] Update doc building instructions 2017-12-05 23:31:26 +00:00
include/lld Prefer `ArrayRef` over `const std::vector&` 2017-12-08 01:09:21 +00:00
lib MachONormalizedFile.h: Remove unimplemented function 2017-11-22 21:10:19 +00:00
test [ELF] Remove Duplicate .ARM.exidx sections 2017-12-15 11:09:41 +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 [WebAssembly] Remove extra semicolon. NFC. 2017-12-15 00:34:32 +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 [docs] Formatting-only change 2017-12-05 23:28:04 +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 69cff27cf63304a3f766e72dc9010407eced5c60635254a3c31496e1183ef9e1.