getUnderlyingObject can return null, handle this.
llvm-svn: 46318
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@ -245,8 +245,9 @@ BasicAliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
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if (!isa<Constant>(P)) {
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const Value *Object = getUnderlyingObject(P);
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// Allocations and byval arguments are "new" objects.
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if (isa<AllocationInst>(Object) ||
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(isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr())) {
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if (Object &&
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(isa<AllocationInst>(Object) ||
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(isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr()))) {
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// Okay, the pointer is to a stack allocated object. If we can prove that
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// the pointer never "escapes", then we know the call cannot clobber it,
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// because it simply can't get its address.
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