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[AliasAnalysis] Check for nullptr before dereferencing. #24657

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Merged
merged 1 commit into from
May 10, 2019
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[AliasAnalysis] Check for nullptr before dereferencing. #24657

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4 changes: 4 additions & 0 deletions lib/SILOptimizer/Analysis/AliasAnalysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -580,6 +580,10 @@ AliasResult AliasAnalysis::aliasInner(SILValue V1, SILValue V2,
LLVM_DEBUG(llvm::dbgs() << "ALIAS ANALYSIS:\n V1: " << *V1
<< " V2: " << *V2);

// If this is SILUndef, return may alias.
if (!V1->getFunction())
return AliasResult::MayAlias;

// Pass in both the TBAA types so we can perform typed access TBAA and the
// actual types of V1, V2 so we can perform class based TBAA.
if (!typesMayAlias(TBAAType1, TBAAType2, *V1->getFunction()))
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