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[msan] Do not insert check on volatile store.

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Volatile bitfields can cause valid stores of uninitialized bits.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173153 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2013-01-22 12:30:52 +00:00
parent 318b2cc86f
commit 4247b13252
2 changed files with 15 additions and 4 deletions
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5
lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -451,9 +451,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
IRB.CreateAlignedStore(Shadow, ShadowPtr, I.getAlignment());
DEBUG(dbgs() << " STORE: " << *NewSI << "\n");
(void)NewSI;
// If the store is volatile, add a check.
if (I.isVolatile())
insertCheck(Val, &I);
if (ClCheckAccessAddress)
insertCheck(Addr, &I);
@ -847,7 +845,6 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
///
/// Stores the corresponding shadow and (optionally) origin.
/// Optionally, checks that the store address is fully defined.
/// Volatile stores check that the value being stored is fully defined.
void visitStoreInst(StoreInst &I) {
StoreList.push_back(&I);
}