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LowerBitSets: do not use private aliases at all on Darwin.

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LLVM currently turns these into linker-private symbols, which can be dead
stripped by the Darwin linker.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232435 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2015-03-16 23:36:24 +00:00
parent 7b8bb89ecd
commit 4556b1fe22
2 changed files with 31 additions and 16 deletions
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29
lib/Transforms/IPO/LowerBitSets.cpp
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@@ -349,9 +349,13 @@ void LowerBitSets::allocateByteArrays() {
// Create an alias instead of RAUW'ing the gep directly. On x86 this ensures
// that the pc-relative displacement is folded into the lea instead of the
// test instruction getting another displacement.
GlobalAlias *Alias = GlobalAlias::create(
Int8Ty, 0, GlobalValue::PrivateLinkage, "bits", GEP, M);
BAI->ByteArray->replaceAllUsesWith(Alias);
if (LinkerSubsectionsViaSymbols) {
BAI->ByteArray->replaceAllUsesWith(GEP);
} else {
GlobalAlias *Alias = GlobalAlias::create(
Int8Ty, 0, GlobalValue::PrivateLinkage, "bits", GEP, M);
BAI->ByteArray->replaceAllUsesWith(Alias);
}
BAI->ByteArray->eraseFromParent();
}
@@ -529,15 +533,16 @@ void LowerBitSets::buildBitSetsFromGlobals(
ConstantInt::get(Int32Ty, I * 2)};
Constant *CombinedGlobalElemPtr =
ConstantExpr::getGetElementPtr(CombinedGlobal, CombinedGlobalIdxs);
GlobalValue::LinkageTypes GAliasLinkage = LinkerSubsectionsViaSymbols
? GlobalValue::PrivateLinkage
: Globals[I]->getLinkage();
GlobalAlias *GAlias = GlobalAlias::create(
Globals[I]->getType()->getElementType(),
Globals[I]->getType()->getAddressSpace(), GAliasLinkage,
"", CombinedGlobalElemPtr, M);
GAlias->takeName(Globals[I]);
Globals[I]->replaceAllUsesWith(GAlias);
if (LinkerSubsectionsViaSymbols) {
Globals[I]->replaceAllUsesWith(CombinedGlobalElemPtr);
} else {
GlobalAlias *GAlias = GlobalAlias::create(
Globals[I]->getType()->getElementType(),
Globals[I]->getType()->getAddressSpace(), Globals[I]->getLinkage(),
"", CombinedGlobalElemPtr, M);
GAlias->takeName(Globals[I]);
Globals[I]->replaceAllUsesWith(GAlias);
}
Globals[I]->eraseFromParent();
}
}