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LowerBitSets: Do not export symbols for bit set referenced globals on Darwin.

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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
This commit is contained in:
Peter Collingbourne 2015-03-14 00:00:49 +00:00
parent 4c1acc151f
commit 99e2c354a8
2 changed files with 14 additions and 1 deletions
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10
lib/Transforms/IPO/LowerBitSets.cpp
View File

@ -16,6 +16,7 @@
#include "llvm/Transforms/IPO.h"
#include "llvm/ADT/EquivalenceClasses.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/Triple.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/GlobalVariable.h"
@ -186,6 +187,7 @@ struct LowerBitSets : public ModulePass {
Module *M;
bool LinkerSubsectionsViaSymbols;
IntegerType *Int1Ty;
IntegerType *Int8Ty;
IntegerType *Int32Ty;
@ -235,6 +237,9 @@ bool LowerBitSets::doInitialization(Module &Mod) {
M = &Mod;
const DataLayout &DL = Mod.getDataLayout();
Triple TargetTriple(M->getTargetTriple());
LinkerSubsectionsViaSymbols = TargetTriple.isMacOSX();
Int1Ty = Type::getInt1Ty(M->getContext());
Int8Ty = Type::getInt8Ty(M->getContext());
Int32Ty = Type::getInt32Ty(M->getContext());
@ -524,9 +529,12 @@ 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(), Globals[I]->getLinkage(),
Globals[I]->getType()->getAddressSpace(), GAliasLinkage,
"", CombinedGlobalElemPtr, M);
GAlias->takeName(Globals[I]);
Globals[I]->replaceAllUsesWith(GAlias);

5
test/Transforms/LowerBitSets/simple.ll
View File

@ -1,4 +1,5 @@
; RUN: opt -S -lowerbitsets < %s | FileCheck %s
; RUN: opt -S -lowerbitsets -mtriple=x86_64-apple-macosx10.8.0 < %s | FileCheck -check-prefix=CHECK-DARWIN %s
; RUN: opt -S -O3 < %s | FileCheck -check-prefix=CHECK-NODISCARD %s
target datalayout = "e-p:32:32"
@ -41,6 +42,10 @@ target datalayout = "e-p:32:32"
; 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)
; 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)
; 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)
; CHECK-DARWIN: @a = private alias
; CHECK-DARWIN: @b = private alias
; CHECK-DARWIN: @c = private alias
; CHECK-DARWIN: @d = private alias
; CHECK: @bits = private alias getelementptr inbounds ([68 x i8], [68 x i8]* [[BA]], i32 0, i32 0)
; CHECK: @bits1 = private alias getelementptr inbounds ([68 x i8], [68 x i8]* [[BA]], i32 0, i32 0)