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getUnderlyingObject can return null, handle this. 

llvm-svn: 46318
This commit is contained in:
Chris Lattner 2008-01-24 19:07:10 +00:00
parent 286f030911
commit 23dd05514e
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/Analysis/BasicAliasAnalysis.cpp
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@ -245,8 +245,9 @@ BasicAliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
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.