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[msan] Raise alignment of origin stores/loads when possible.

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Origin alignment is as high as the alignment of the corresponding application
location, but never less than 4.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2012-12-26 11:55:09 +00:00
parent ab29644a33
commit b53be53c72
2 changed files with 20 additions and 7 deletions
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lib/Transforms/Instrumentation/MemorySanitizer.cpp
+11 -5
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@@ -100,7 +100,8 @@ static const uint64_t kShadowMask32 = 1ULL << 31;
static const uint64_t kShadowMask64 = 1ULL << 46;
static const uint64_t kOriginOffset32 = 1ULL << 30;
static const uint64_t kOriginOffset64 = 1ULL << 45;
static const uint64_t kShadowTLSAlignment = 8;
static const unsigned kMinOriginAlignment = 4;
static const unsigned kShadowTLSAlignment = 8;
/// \brief Track origins of uninitialized values.
///
@@ -451,8 +452,10 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
insertCheck(Addr, &I);
if (MS.TrackOrigins) {
unsigned Alignment = std::max(kMinOriginAlignment, I.getAlignment());
if (ClStoreCleanOrigin || isa<StructType>(Shadow->getType())) {
IRB.CreateStore(getOrigin(Val), getOriginPtr(Addr, IRB));
IRB.CreateAlignedStore(getOrigin(Val), getOriginPtr(Addr, IRB),
Alignment);
} else {
Value *ConvertedShadow = convertToShadowTyNoVec(Shadow, IRB);
@@ -469,7 +472,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
SplitBlockAndInsertIfThen(cast<Instruction>(Cmp), false,
MS.OriginStoreWeights);
IRBuilder<> IRBNew(CheckTerm);
IRBNew.CreateStore(getOrigin(Val), getOriginPtr(Addr, IRBNew));
IRBNew.CreateAlignedStore(getOrigin(Val), getOriginPtr(Addr, IRBNew),
Alignment);
}
}
}
@@ -827,8 +831,10 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
if (ClCheckAccessAddress)
insertCheck(I.getPointerOperand(), &I);
if (MS.TrackOrigins)
setOrigin(&I, IRB.CreateLoad(getOriginPtr(Addr, IRB)));
if (MS.TrackOrigins) {
unsigned Alignment = std::max(kMinOriginAlignment, I.getAlignment());
setOrigin(&I, IRB.CreateAlignedLoad(getOriginPtr(Addr, IRB), Alignment));
}
}
/// \brief Instrument StoreInst