#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/ADT/ValueMap.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
-#include "llvm/Transforms/Utils/BlackList.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
+#include "llvm/Transforms/Utils/SpecialCaseList.h"
using namespace llvm;
MDNode *ColdCallWeights;
/// \brief Branch weights for origin store.
MDNode *OriginStoreWeights;
- /// \bried Path to blacklist file.
+ /// \brief Path to blacklist file.
SmallString<64> BlacklistFile;
/// \brief The blacklist.
- OwningPtr<BlackList> BL;
+ OwningPtr<SpecialCaseList> BL;
/// \brief An empty volatile inline asm that prevents callback merge.
InlineAsm *EmptyAsm;
RetvalTLS = new GlobalVariable(
M, ArrayType::get(IRB.getInt64Ty(), 8), false,
GlobalVariable::ExternalLinkage, 0, "__msan_retval_tls", 0,
- GlobalVariable::GeneralDynamicTLSModel);
+ GlobalVariable::InitialExecTLSModel);
RetvalOriginTLS = new GlobalVariable(
M, OriginTy, false, GlobalVariable::ExternalLinkage, 0,
- "__msan_retval_origin_tls", 0, GlobalVariable::GeneralDynamicTLSModel);
+ "__msan_retval_origin_tls", 0, GlobalVariable::InitialExecTLSModel);
ParamTLS = new GlobalVariable(
M, ArrayType::get(IRB.getInt64Ty(), 1000), false,
GlobalVariable::ExternalLinkage, 0, "__msan_param_tls", 0,
- GlobalVariable::GeneralDynamicTLSModel);
+ GlobalVariable::InitialExecTLSModel);
ParamOriginTLS = new GlobalVariable(
M, ArrayType::get(OriginTy, 1000), false, GlobalVariable::ExternalLinkage,
- 0, "__msan_param_origin_tls", 0, GlobalVariable::GeneralDynamicTLSModel);
+ 0, "__msan_param_origin_tls", 0, GlobalVariable::InitialExecTLSModel);
VAArgTLS = new GlobalVariable(
M, ArrayType::get(IRB.getInt64Ty(), 1000), false,
GlobalVariable::ExternalLinkage, 0, "__msan_va_arg_tls", 0,
- GlobalVariable::GeneralDynamicTLSModel);
+ GlobalVariable::InitialExecTLSModel);
VAArgOverflowSizeTLS = new GlobalVariable(
M, IRB.getInt64Ty(), false, GlobalVariable::ExternalLinkage, 0,
"__msan_va_arg_overflow_size_tls", 0,
- GlobalVariable::GeneralDynamicTLSModel);
+ GlobalVariable::InitialExecTLSModel);
OriginTLS = new GlobalVariable(
M, IRB.getInt32Ty(), false, GlobalVariable::ExternalLinkage, 0,
- "__msan_origin_tls", 0, GlobalVariable::GeneralDynamicTLSModel);
+ "__msan_origin_tls", 0, GlobalVariable::InitialExecTLSModel);
// We insert an empty inline asm after __msan_report* to avoid callback merge.
EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
TD = getAnalysisIfAvailable<DataLayout>();
if (!TD)
return false;
- BL.reset(new BlackList(BlacklistFile));
+ BL.reset(SpecialCaseList::createOrDie(BlacklistFile));
C = &(M.getContext());
unsigned PtrSize = TD->getPointerSizeInBits(/* AddressSpace */0);
switch (PtrSize) {
appendToGlobalCtors(M, cast<Function>(M.getOrInsertFunction(
"__msan_init", IRB.getVoidTy(), NULL)), 0);
- new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
- IRB.getInt32(TrackOrigins), "__msan_track_origins");
+ if (TrackOrigins)
+ new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
+ IRB.getInt32(TrackOrigins), "__msan_track_origins");
- new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
- IRB.getInt32(ClKeepGoing), "__msan_keep_going");
+ if (ClKeepGoing)
+ new GlobalVariable(M, IRB.getInt32Ty(), true, GlobalValue::WeakODRLinkage,
+ IRB.getInt32(ClKeepGoing), "__msan_keep_going");
return true;
}
ValueMap<Value*, Value*> ShadowMap, OriginMap;
bool InsertChecks;
bool LoadShadow;
+ bool PoisonStack;
+ bool PoisonUndef;
OwningPtr<VarArgHelper> VAHelper;
struct ShadowOriginAndInsertPoint {
MemorySanitizerVisitor(Function &F, MemorySanitizer &MS)
: F(F), MS(MS), VAHelper(CreateVarArgHelper(F, MS, *this)) {
- LoadShadow = InsertChecks =
- !MS.BL->isIn(F) &&
- F.getAttributes().hasAttribute(AttributeSet::FunctionIndex,
- Attribute::SanitizeMemory);
+ bool SanitizeFunction = !MS.BL->isIn(F) && F.getAttributes().hasAttribute(
+ AttributeSet::FunctionIndex,
+ Attribute::SanitizeMemory);
+ InsertChecks = SanitizeFunction;
+ LoadShadow = SanitizeFunction;
+ PoisonStack = SanitizeFunction && ClPoisonStack;
+ PoisonUndef = SanitizeFunction && ClPoisonUndef;
DEBUG(if (!InsertChecks)
dbgs() << "MemorySanitizer is not inserting checks into '"
return Shadow;
}
if (UndefValue *U = dyn_cast<UndefValue>(V)) {
- Value *AllOnes = ClPoisonUndef ? getPoisonedShadow(V) : getCleanShadow(V);
+ Value *AllOnes = PoisonUndef ? getPoisonedShadow(V) : getCleanShadow(V);
DEBUG(dbgs() << "Undef: " << *U << " ==> " << *AllOnes << "\n");
(void)U;
return AllOnes;
if (AI->hasByValAttr()) {
// ByVal pointer itself has clean shadow. We copy the actual
// argument shadow to the underlying memory.
+ // Figure out maximal valid memcpy alignment.
+ unsigned ArgAlign = AI->getParamAlignment();
+ if (ArgAlign == 0) {
+ Type *EltType = A->getType()->getPointerElementType();
+ ArgAlign = MS.TD->getABITypeAlignment(EltType);
+ }
+ unsigned CopyAlign = std::min(ArgAlign, kShadowTLSAlignment);
Value *Cpy = EntryIRB.CreateMemCpy(
- getShadowPtr(V, EntryIRB.getInt8Ty(), EntryIRB),
- Base, Size, AI->getParamAlignment());
+ getShadowPtr(V, EntryIRB.getInt8Ty(), EntryIRB), Base, Size,
+ CopyAlign);
DEBUG(dbgs() << " ByValCpy: " << *Cpy << "\n");
(void)Cpy;
*ShadowPtr = getCleanShadow(V);
} else {
- *ShadowPtr = EntryIRB.CreateLoad(Base);
+ *ShadowPtr = EntryIRB.CreateAlignedLoad(Base, kShadowTLSAlignment);
}
DEBUG(dbgs() << " ARG: " << *AI << " ==> " <<
**ShadowPtr << "\n");
setOrigin(A, EntryIRB.CreateLoad(OriginPtr));
}
}
- ArgOffset += DataLayout::RoundUpAlignment(Size, 8);
+ ArgOffset += DataLayout::RoundUpAlignment(Size, kShadowTLSAlignment);
}
assert(*ShadowPtr && "Could not find shadow for an argument");
return *ShadowPtr;
void visitAllocaInst(AllocaInst &I) {
setShadow(&I, getCleanShadow(&I));
- if (!ClPoisonStack) return;
IRBuilder<> IRB(I.getNextNode());
uint64_t Size = MS.TD->getTypeAllocSize(I.getAllocatedType());
- if (ClPoisonStackWithCall) {
+ if (PoisonStack && ClPoisonStackWithCall) {
IRB.CreateCall2(MS.MsanPoisonStackFn,
IRB.CreatePointerCast(&I, IRB.getInt8PtrTy()),
ConstantInt::get(MS.IntptrTy, Size));
} else {
Value *ShadowBase = getShadowPtr(&I, Type::getInt8PtrTy(*MS.C), IRB);
- IRB.CreateMemSet(ShadowBase, IRB.getInt8(ClPoisonStackPattern),
- Size, I.getAlignment());
+ Value *PoisonValue = IRB.getInt8(PoisonStack ? ClPoisonStackPattern : 0);
+ IRB.CreateMemSet(ShadowBase, PoisonValue, Size, I.getAlignment());
}
- if (MS.TrackOrigins) {
+ if (PoisonStack && MS.TrackOrigins) {
setOrigin(&I, getCleanOrigin());
SmallString<2048> StackDescriptionStorage;
raw_svector_ostream StackDescription(StackDescriptionStorage);
}
};
-VarArgHelper* CreateVarArgHelper(Function &Func, MemorySanitizer &Msan,
+/// \brief A no-op implementation of VarArgHelper.
+struct VarArgNoOpHelper : public VarArgHelper {
+ VarArgNoOpHelper(Function &F, MemorySanitizer &MS,
+ MemorySanitizerVisitor &MSV) {}
+
+ void visitCallSite(CallSite &CS, IRBuilder<> &IRB) {}
+
+ void visitVAStartInst(VAStartInst &I) {}
+
+ void visitVACopyInst(VACopyInst &I) {}
+
+ void finalizeInstrumentation() {}
+};
+
+VarArgHelper *CreateVarArgHelper(Function &Func, MemorySanitizer &Msan,
MemorySanitizerVisitor &Visitor) {
- return new VarArgAMD64Helper(Func, Msan, Visitor);
+ // VarArg handling is only implemented on AMD64. False positives are possible
+ // on other platforms.
+ llvm::Triple TargetTriple(Func.getParent()->getTargetTriple());
+ if (TargetTriple.getArch() == llvm::Triple::x86_64)
+ return new VarArgAMD64Helper(Func, Msan, Visitor);
+ else
+ return new VarArgNoOpHelper(Func, Msan, Visitor);
}
} // namespace
projects / oota-llvm.git / blobdiff