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Allow subclasses of the ValueHandleBase to store information as part of the
value pointer by making the value pointer into a pointer-int pair with 2 bits available for flags. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154279 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -49,52 +49,61 @@ protected:
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Tracking,
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Weak
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};
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private:
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private:
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PointerIntPair<ValueHandleBase**, 2, HandleBaseKind> PrevPair;
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ValueHandleBase *Next;
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Value *VP;
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// A subclass may want to store some information along with the value
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// pointer. Allow them to do this by making the value pointer a pointer-int
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// pair. The 'setValPtrInt' and 'getValPtrInt' methods below give them this
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// access.
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PointerIntPair<Value*, 2> VP;
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explicit ValueHandleBase(const ValueHandleBase&); // DO NOT IMPLEMENT.
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public:
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explicit ValueHandleBase(HandleBaseKind Kind)
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: PrevPair(0, Kind), Next(0), VP(0) {}
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: PrevPair(0, Kind), Next(0), VP(0, 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 (isValid(VP))
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: PrevPair(0, Kind), Next(0), VP(V, 0) {
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if (isValid(VP.getPointer()))
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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 (isValid(VP))
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if (isValid(VP.getPointer()))
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AddToExistingUseList(RHS.getPrevPtr());
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}
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~ValueHandleBase() {
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if (isValid(VP))
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if (isValid(VP.getPointer()))
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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 (isValid(VP)) RemoveFromUseList();
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VP = RHS;
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if (isValid(VP)) AddToUseList();
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if (VP.getPointer() == RHS) return RHS;
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if (isValid(VP.getPointer())) RemoveFromUseList();
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VP.setPointer(RHS);
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if (isValid(VP.getPointer())) 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 (isValid(VP)) RemoveFromUseList();
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VP = RHS.VP;
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if (isValid(VP)) AddToExistingUseList(RHS.getPrevPtr());
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return VP;
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if (VP.getPointer() == RHS.VP.getPointer()) return RHS.VP.getPointer();
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if (isValid(VP.getPointer())) RemoveFromUseList();
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VP.setPointer(RHS.VP.getPointer());
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if (isValid(VP.getPointer())) AddToExistingUseList(RHS.getPrevPtr());
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return VP.getPointer();
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}
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Value *operator->() const { return getValPtr(); }
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Value &operator*() const { return *getValPtr(); }
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protected:
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Value *getValPtr() const { return VP; }
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Value *getValPtr() const { return VP.getPointer(); }
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void setValPtrInt(unsigned K) { VP.setInt(K); }
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unsigned getValPtrInt() const { return VP.getInt(); }
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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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@ -477,7 +477,7 @@ void ValueHandleBase::AddToExistingUseList(ValueHandleBase **List) {
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setPrevPtr(List);
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if (Next) {
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Next->setPrevPtr(&Next);
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assert(VP == Next->VP && "Added to wrong list?");
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assert(VP.getPointer() == Next->VP.getPointer() && "Added to wrong list?");
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}
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}
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@ -493,14 +493,14 @@ void ValueHandleBase::AddToExistingUseListAfter(ValueHandleBase *List) {
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/// AddToUseList - Add this ValueHandle to the use list for VP.
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void ValueHandleBase::AddToUseList() {
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assert(VP && "Null pointer doesn't have a use list!");
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assert(VP.getPointer() && "Null pointer doesn't have a use list!");
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LLVMContextImpl *pImpl = VP->getContext().pImpl;
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LLVMContextImpl *pImpl = VP.getPointer()->getContext().pImpl;
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if (VP->HasValueHandle) {
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if (VP.getPointer()->HasValueHandle) {
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// If this value already has a ValueHandle, then it must be in the
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// ValueHandles map already.
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ValueHandleBase *&Entry = pImpl->ValueHandles[VP];
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ValueHandleBase *&Entry = pImpl->ValueHandles[VP.getPointer()];
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assert(Entry != 0 && "Value doesn't have any handles?");
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AddToExistingUseList(&Entry);
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return;
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@ -514,10 +514,10 @@ void ValueHandleBase::AddToUseList() {
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DenseMap<Value*, ValueHandleBase*> &Handles = pImpl->ValueHandles;
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const void *OldBucketPtr = Handles.getPointerIntoBucketsArray();
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ValueHandleBase *&Entry = Handles[VP];
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ValueHandleBase *&Entry = Handles[VP.getPointer()];
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assert(Entry == 0 && "Value really did already have handles?");
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AddToExistingUseList(&Entry);
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VP->HasValueHandle = true;
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VP.getPointer()->HasValueHandle = true;
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// If reallocation didn't happen or if this was the first insertion, don't
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// walk the table.
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@ -529,14 +529,16 @@ void ValueHandleBase::AddToUseList() {
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// Okay, reallocation did happen. Fix the Prev Pointers.
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for (DenseMap<Value*, ValueHandleBase*>::iterator I = Handles.begin(),
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E = Handles.end(); I != E; ++I) {
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assert(I->second && I->first == I->second->VP && "List invariant broken!");
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assert(I->second && I->first == I->second->VP.getPointer() &&
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"List invariant broken!");
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I->second->setPrevPtr(&I->second);
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}
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}
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/// RemoveFromUseList - Remove this ValueHandle from its current use list.
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void ValueHandleBase::RemoveFromUseList() {
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assert(VP && VP->HasValueHandle && "Pointer doesn't have a use list!");
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assert(VP.getPointer() && VP.getPointer()->HasValueHandle &&
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"Pointer doesn't have a use list!");
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// Unlink this from its use list.
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ValueHandleBase **PrevPtr = getPrevPtr();
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@ -552,11 +554,11 @@ void ValueHandleBase::RemoveFromUseList() {
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// If the Next pointer was null, then it is possible that this was the last
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// ValueHandle watching VP. If so, delete its entry from the ValueHandles
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// map.
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LLVMContextImpl *pImpl = VP->getContext().pImpl;
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LLVMContextImpl *pImpl = VP.getPointer()->getContext().pImpl;
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DenseMap<Value*, ValueHandleBase*> &Handles = pImpl->ValueHandles;
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if (Handles.isPointerIntoBucketsArray(PrevPtr)) {
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Handles.erase(VP);
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VP->HasValueHandle = false;
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Handles.erase(VP.getPointer());
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VP.getPointer()->HasValueHandle = false;
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}
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}
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