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[ObjC][ARC] Invalidate an entry of UnderlyingObjCPtrCache when the instruction the key points to is deleted #3516

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Merged
merged 1 commit into from
Nov 9, 2021
Merged

[ObjC][ARC] Invalidate an entry of UnderlyingObjCPtrCache when the instruction the key points to is deleted #3516

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15 changes: 9 additions & 6 deletions llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h
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Original file line number Diff line number Diff line change
Expand Up @@ -78,14 +78,17 @@ inline const Value *GetUnderlyingObjCPtr(const Value *V) {
}

/// A wrapper for GetUnderlyingObjCPtr used for results memoization.
inline const Value *
GetUnderlyingObjCPtrCached(const Value *V,
DenseMap<const Value *, WeakTrackingVH> &Cache) {
if (auto InCache = Cache.lookup(V))
return InCache;
inline const Value *GetUnderlyingObjCPtrCached(
const Value *V,
DenseMap<const Value *, std::pair<WeakVH, WeakTrackingVH>> &Cache) {
// The entry is invalid if either value handle is null.
auto InCache = Cache.lookup(V);
if (InCache.first && InCache.second)
return InCache.second;

const Value *Computed = GetUnderlyingObjCPtr(V);
Cache[V] = const_cast<Value *>(Computed);
Cache[V] =
std::make_pair(const_cast<Value *>(V), const_cast<Value *>(Computed));
return Computed;
}

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3 changes: 2 additions & 1 deletion llvm/lib/Transforms/ObjCARC/ProvenanceAnalysis.h
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,8 @@ class ProvenanceAnalysis {

CachedResultsTy CachedResults;

DenseMap<const Value *, WeakTrackingVH> UnderlyingObjCPtrCache;
DenseMap<const Value *, std::pair<WeakVH, WeakTrackingVH>>
UnderlyingObjCPtrCache;

bool relatedCheck(const Value *A, const Value *B);
bool relatedSelect(const SelectInst *A, const Value *B);
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