llvm-project/lld
Jez Ng ceff23c6e3 [lld-macho] -flat_namespace for dylibs should make all externs interposable
All references to interposable symbols can be redirected at runtime to
point to a different symbol definition (with the same name). For
example, if both dylib A and B define symbol _foo, and we load A before
B at runtime, then all references to _foo within dylib B will point to
the definition in dylib A.

ld64 makes all extern symbols interposable when linking with
`-flat_namespace`.

TODO 1: Support `-interposable` and `-interposable_list`, which should
just be a matter of parsing those CLI flags and setting the
`Defined::interposable` bit.

TODO 2: Set Reloc::FinalDefinitionInLinkageUnit correctly with this info
(we are currently not setting it at all, so we're erring on the
conservative side, but we should help the LTO backend generate more
optimal code.)

Reviewed By: modimo, MaskRay

Differential Revision: https://reviews.llvm.org/D119294
2022-03-14 22:18:32 -04:00
..
COFF Cleanup includes: WindowsDriver & WindowsManifest 2022-03-10 17:19:06 +01:00
Common Revert "Cleanup codegen includes" 2022-03-10 07:59:22 -05:00
ELF [ELF] Move section assignment from initializeSymbols to postParse 2022-03-14 14:13:41 -07:00
MachO [lld-macho] -flat_namespace for dylibs should make all externs interposable 2022-03-14 22:18:32 -04:00
MinGW [LLD][MinGW] Add --heap argument support 2022-01-30 00:01:45 +02:00
cmake/modules [CMake] Factor out config prefix finding logic 2022-01-07 20:16:18 +00:00
docs [ELF] Move section assignment from initializeSymbols to postParse 2022-03-14 14:13:41 -07:00
include/lld [lld] Make error handling functions opaque 2022-02-17 11:54:57 -08:00
test [lld-macho] -flat_namespace for dylibs should make all externs interposable 2022-03-14 22:18:32 -04:00
tools/lld [LLD] Fix issue in HIP due to unspecified order of evaluation of the function object 2022-02-08 19:12:15 -05:00
utils
wasm [WebAssembly] Second phase of implemented extended const proposal 2022-03-14 08:55:47 -07:00
.clang-format
.clang-tidy NFC: .clang-tidy: Inherit configs from parents to improve maintainability 2021-06-08 08:25:59 -07:00
.gitignore
CMakeLists.txt [lld] Require C++14 in LLD standalone build 2022-02-22 18:15:29 -05:00
CODE_OWNERS.TXT Add code owners of new MachO port 2020-09-02 19:32:12 -07:00
LICENSE.TXT
README.md [doc] Place sha256 in lld/README.md into backticks 2021-01-12 10:19:40 -08:00

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.