Author: lattner
Date: Thu Jan 24 13:07:10 2008
New Revision: 46318
URL: http://llvm.org/viewvc/llvm-project?rev=46318&view=rev
Log:
getUnderlyingObject can return null, handle this.
Modified:
llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
Modified: llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp?rev=46318&r1=46317&r2=46318&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp Thu Jan 24 13:07:10 2008
@@ -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.
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