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LowerBitSets: Do not export symbols for bit set referenced globals on Darwin.
The linker on that platform may re-order symbols or strip dead symbols, which will break bit set checks. Avoid this by hiding the symbols from the linker. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232235 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -16,6 +16,7 @@
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#include "llvm/Transforms/IPO.h"
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#include "llvm/ADT/EquivalenceClasses.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/IR/Constant.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/GlobalVariable.h"
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@ -186,6 +187,7 @@ struct LowerBitSets : public ModulePass {
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Module *M;
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bool LinkerSubsectionsViaSymbols;
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IntegerType *Int1Ty;
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IntegerType *Int8Ty;
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IntegerType *Int32Ty;
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@ -235,6 +237,9 @@ bool LowerBitSets::doInitialization(Module &Mod) {
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M = &Mod;
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const DataLayout &DL = Mod.getDataLayout();
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Triple TargetTriple(M->getTargetTriple());
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LinkerSubsectionsViaSymbols = TargetTriple.isMacOSX();
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Int1Ty = Type::getInt1Ty(M->getContext());
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Int8Ty = Type::getInt8Ty(M->getContext());
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Int32Ty = Type::getInt32Ty(M->getContext());
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@ -524,9 +529,12 @@ void LowerBitSets::buildBitSetsFromGlobals(
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ConstantInt::get(Int32Ty, I * 2)};
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Constant *CombinedGlobalElemPtr =
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ConstantExpr::getGetElementPtr(CombinedGlobal, CombinedGlobalIdxs);
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GlobalValue::LinkageTypes GAliasLinkage = LinkerSubsectionsViaSymbols
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? GlobalValue::PrivateLinkage
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: Globals[I]->getLinkage();
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GlobalAlias *GAlias = GlobalAlias::create(
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Globals[I]->getType()->getElementType(),
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Globals[I]->getType()->getAddressSpace(), Globals[I]->getLinkage(),
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Globals[I]->getType()->getAddressSpace(), GAliasLinkage,
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"", CombinedGlobalElemPtr, M);
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GAlias->takeName(Globals[I]);
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Globals[I]->replaceAllUsesWith(GAlias);
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@ -1,4 +1,5 @@
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; RUN: opt -S -lowerbitsets < %s | FileCheck %s
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; RUN: opt -S -lowerbitsets -mtriple=x86_64-apple-macosx10.8.0 < %s | FileCheck -check-prefix=CHECK-DARWIN %s
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; RUN: opt -S -O3 < %s | FileCheck -check-prefix=CHECK-NODISCARD %s
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target datalayout = "e-p:32:32"
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@ -41,6 +42,10 @@ target datalayout = "e-p:32:32"
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; CHECK: @b = alias getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 2)
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; CHECK: @c = alias getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 4)
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; CHECK: @d = alias getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 6)
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; CHECK-DARWIN: @a = private alias
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; CHECK-DARWIN: @b = private alias
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; CHECK-DARWIN: @c = private alias
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; CHECK-DARWIN: @d = private alias
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; CHECK: @bits = private alias getelementptr inbounds ([68 x i8], [68 x i8]* [[BA]], i32 0, i32 0)
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; CHECK: @bits1 = private alias getelementptr inbounds ([68 x i8], [68 x i8]* [[BA]], i32 0, i32 0)
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