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llvm-project/lld
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Fangrui Song db5e078690 [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 
In PGO, a C++ external linkage function `foo` has a private counter
`__profc_foo` and a private `__profd_foo` in a `comdat nodeduplicate`.

A `__attribute__((weak))` function `foo` has a weak hidden counter `__profc_foo`
and a private `__profd_foo` in a `comdat nodeduplicate`.

In `ld.lld a.o b.o`, say a.o defines an external linkage `foo` and b.o
defines a weak `foo`. Currently we treat `comdat nodeduplicate` as `comdat any`,
ld.lld will incorrectly consider `b.o:__profc_foo` non-prevailing.  In the worst
case when `b.o:__profd_foo` is retained and `b.o:__profc_foo` isn't, there will
be dangling reference causing an `undefined hidden symbol` error.

Add SelectionKind to `Comdat` in IRSymtab and let linkers ignore nodeduplicate comdat.

Differential Revision: https://reviews.llvm.org/D106228
 		2021-07-20 13:22:00 -07:00
..
COFF [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
Common [lld] Rename StringRef _lower() method calls to _insensitive() 2021-06-25 00:22:01 +03:00
ELF [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
MachO Revert D106128 "[lld-macho] Use DO_BIND_ADD_ADDR_IMM_SCALED for bind opcodes" 2021-07-19 18:13:52 -07:00
MinGW [LLD] [COFF] Fix up missing stdcall decorations in MinGW mode 2021-07-02 09:49:14 +03:00
cmake/modules [cmake] Add support for multiple distributions 2021-05-12 11:13:18 -07:00
docs [lld][WebAssembly] Add new `--import-undefined` option 2021-06-17 11:44:21 -07:00
include/lld [WebAssembly] Rename event to tag 2021-06-17 20:34:19 -07:00
lib [OptTable] Rename PrintHelp to printHelp 2021-06-24 14:47:03 -07:00
test [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
tools/lld [lld] Rename StringRef _lower() method calls to _insensitive() 2021-06-25 00:22:01 +03:00
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
…
wasm [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -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 Fix lld macho standalone build by including llvm/Config/llvm-config.h instead of llvm/Config/config.h 2021-05-19 11:15:07 -04:00
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.