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[IR] Add missing GlobalAlias copying of ThreadLocalMode attribute

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Summary:
Previously, GlobalAlias::copyAttributesFrom did not preserve ThreadLocalMode,
causing incorrect IR generation in IR linking flows. This patch pushes the code
responsible for copying this attribute from GlobalVariable::copyAttributesFrom
down to GlobalValue::copyAttributesFrom so that it is shared by GlobalAlias.
Fixes PR46297.

Reviewers: tejohnson, pcc, hans

Reviewed By: tejohnson, hans

Subscribers: hiraditya, ibookstein, dexonsmith, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D81605
This commit is contained in:
Itay Bookstein 2020-06-16 16:17:27 -07:00 committed by Teresa Johnson
parent 3b34f3fcca
commit df9d64ed9c
3 changed files with 12 additions and 1 deletions
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2
llvm/lib/IR/Globals.cpp
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@ -65,6 +65,7 @@ Value *GlobalValue::handleOperandChangeImpl(Value *From, Value *To) {
void GlobalValue::copyAttributesFrom(const GlobalValue *Src) {
setVisibility(Src->getVisibility());
setUnnamedAddr(Src->getUnnamedAddr());
setThreadLocalMode(Src->getThreadLocalMode());
setDLLStorageClass(Src->getDLLStorageClass());
setDSOLocal(Src->isDSOLocal());
setPartition(Src->getPartition());
@ -419,7 +420,6 @@ void GlobalVariable::setInitializer(Constant *InitVal) {
/// from the GlobalVariable Src to this one.
void GlobalVariable::copyAttributesFrom(const GlobalVariable *Src) {
GlobalObject::copyAttributesFrom(Src);
setThreadLocalMode(Src->getThreadLocalMode());
setExternallyInitialized(Src->isExternallyInitialized());
setAttributes(Src->getAttributes());
}

2
llvm/test/Linker/Inputs/alias-threadlocal-defs.ll Normal file
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@ -0,0 +1,2 @@
@tlsvar1 = thread_local global i32 0, align 4
@tlsvar2 = hidden thread_local alias i32, i32* @tlsvar1

9
llvm/test/Linker/alias-threadlocal.ll Normal file
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@ -0,0 +1,9 @@
; RUN: llvm-link %s %p/Inputs/alias-threadlocal-defs.ll -S -o - | FileCheck %s
; PR46297
; Verify that linking GlobalAliases preserves the thread_local attribute
; CHECK: @tlsvar1 = thread_local global i32 0, align 4
; CHECK: @tlsvar2 = hidden thread_local alias i32, i32* @tlsvar1
@tlsvar2 = external thread_local global i32, align 4