getUnderlyingObject can return null, handle this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46318 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 381298b..be8fe07 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -245,8 +245,9 @@
if (!isa<Constant>(P)) {
const Value *Object = getUnderlyingObject(P);
// Allocations and byval arguments are "new" objects.
- if (isa<AllocationInst>(Object) ||
- (isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr())) {
+ if (Object &&
+ (isa<AllocationInst>(Object) ||
+ (isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr()))) {
// Okay, the pointer is to a stack allocated object. If we can prove that
// the pointer never "escapes", then we know the call cannot clobber it,
// because it simply can't get its address.