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[dfsan] Correctly handle loads and stores of zero size.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214561 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2014-08-01 21:18:18 +00:00
parent f9799dbe51
commit f1499548d0
3 changed files with 34 additions and 1 deletions
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8
lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
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@ -1092,6 +1092,11 @@ Value *DFSanFunction::loadShadow(Value *Addr, uint64_t Size, uint64_t Align,
void DFSanVisitor::visitLoadInst(LoadInst &LI) {
uint64_t Size = DFSF.DFS.DL->getTypeStoreSize(LI.getType());
if (Size == 0) {
DFSF.setShadow(&LI, DFSF.DFS.ZeroShadow);
return;
}
uint64_t Align;
if (ClPreserveAlignment) {
Align = LI.getAlignment();
@ -1166,6 +1171,9 @@ void DFSanFunction::storeShadow(Value *Addr, uint64_t Size, uint64_t Align,
void DFSanVisitor::visitStoreInst(StoreInst &SI) {
uint64_t Size =
DFSF.DFS.DL->getTypeStoreSize(SI.getValueOperand()->getType());
if (Size == 0)
return;
uint64_t Align;
if (ClPreserveAlignment) {
Align = SI.getAlignment();