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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
View File

@ -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);
}

14
test/Instrumentation/MemorySanitizer/msan_basic.ll
View File

@ -563,3 +563,17 @@ define void @VACopy(i8* %p1, i8* %p2) nounwind uwtable {
; CHECK: @VACopy
; CHECK: call void @llvm.memset.p0i8.i64({{.*}}, i8 0, i64 24, i32 8, i1 false)
; CHECK: ret void
; Test handling of volatile stores.
; Check that MemorySanitizer does not add a check of the value being stored.
define void @VolatileStore(i32* nocapture %p, i32 %x) nounwind uwtable {
entry:
store volatile i32 %x, i32* %p, align 4
ret void
}
; CHECK: @VolatileStore
; CHECK-NOT: @__msan_warning
; CHECK: ret void