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Teach ValueHandleBase to treat DenseMap's special Empty and Tombstone
values the same way it treats null pointers. This is needed to allow CallbackVH to be used as a key in a DenseMap. llvm-svn: 77695
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@ -14,6 +14,7 @@
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#ifndef LLVM_SUPPORT_VALUEHANDLE_H
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#define LLVM_SUPPORT_VALUEHANDLE_H
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#include "llvm/ADT/DenseMapInfo.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/Value.h"
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@ -57,32 +58,32 @@ public:
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: PrevPair(0, Kind), Next(0), VP(0) {}
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ValueHandleBase(HandleBaseKind Kind, Value *V)
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: PrevPair(0, Kind), Next(0), VP(V) {
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if (V)
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if (isValid(VP))
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AddToUseList();
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}
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ValueHandleBase(HandleBaseKind Kind, const ValueHandleBase &RHS)
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: PrevPair(0, Kind), Next(0), VP(RHS.VP) {
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if (VP)
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if (isValid(VP))
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AddToExistingUseList(RHS.getPrevPtr());
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}
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~ValueHandleBase() {
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if (VP)
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if (isValid(VP))
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RemoveFromUseList();
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}
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Value *operator=(Value *RHS) {
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if (VP == RHS) return RHS;
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if (VP) RemoveFromUseList();
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if (isValid(VP)) RemoveFromUseList();
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VP = RHS;
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if (VP) AddToUseList();
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if (isValid(VP)) AddToUseList();
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return RHS;
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}
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Value *operator=(const ValueHandleBase &RHS) {
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if (VP == RHS.VP) return RHS.VP;
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if (VP) RemoveFromUseList();
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if (isValid(VP)) RemoveFromUseList();
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VP = RHS.VP;
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if (VP) AddToExistingUseList(RHS.getPrevPtr());
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if (isValid(VP)) AddToExistingUseList(RHS.getPrevPtr());
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return VP;
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}
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@ -92,6 +93,12 @@ public:
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protected:
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Value *getValPtr() const { return VP; }
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private:
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static bool isValid(Value *V) {
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return V &&
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V != DenseMapInfo<Value *>::getEmptyKey() &&
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V != DenseMapInfo<Value *>::getTombstoneKey();
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}
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// Callbacks made from Value.
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static void ValueIsDeleted(Value *V);
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static void ValueIsRAUWd(Value *Old, Value *New);
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