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Fangrui Song 2174d3b961 [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
benchmarks
bindings [IR] Rename comdat noduplicates to comdat nodeduplicate 2021-07-20 12:47:10 -07:00
cmake [CMake] Disable -fno-semantic-interposition for GCC<10.3 on SystemZ 2021-07-08 22:09:21 -07:00
docs [IR] Rename comdat noduplicates to comdat nodeduplicate 2021-07-20 12:47:10 -07:00
examples Opaque pointer GEP fixes for BrainF example 2021-07-18 18:25:54 -07:00
include [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
lib [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
projects [RFC][debuginfo-test] Rename debug-info lit tests for general purposes 2021-06-28 11:31:40 +01:00
resources
runtimes [runtimes] Fix umbrella component targets 2021-06-12 19:49:44 -07:00
test [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
tools [LTO] Add SelectionKind to IRSymtab and use it in ld.lld/LLVMgold 2021-07-20 13:22:00 -07:00
unittests [Orc] Fix sret/byval attributes in test (NFC) 2021-07-20 20:47:15 +02:00
utils [Utils] Add -compilation-dir flag to prepare-code-coverage-artifact.py 2021-07-20 10:55:49 -07:00
.clang-format
.clang-tidy NFC: .clang-tidy: Inherit configs from parents to improve maintainability 2021-06-08 08:25:59 -07:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore Remove .gitignore entries not relevant in the monorepo. 2021-04-07 12:25:02 -07:00
CMakeLists.txt [MLGO] Use binary protobufs for improved training performance. 2021-07-19 13:59:28 -07:00
CODE_OWNERS.TXT [NFC] Update code owners file 2021-07-20 11:29:10 -07:00
configure
CREDITS.TXT Update personal info in CREDITS.TXT 2021-04-11 19:25:02 +08:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
README.txt Test commit. 2020-03-14 18:08:26 -07:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.