/// fully general Callback version does have a vtable.
enum HandleBaseKind {
Assert,
- Weak,
- Callback
+ Callback,
+ Tracking,
+ Weak
};
private:
PointerIntPair<ValueHandleBase**, 2, HandleBaseKind> PrevPair;
ValueHandleBase *Next;
Value *VP;
+
+ explicit ValueHandleBase(const ValueHandleBase&); // DO NOT IMPLEMENT.
public:
explicit ValueHandleBase(HandleBaseKind Kind)
: PrevPair(0, Kind), Next(0), VP(0) {}
protected:
Value *getValPtr() const { return VP; }
-private:
static bool isValid(Value *V) {
return V &&
V != DenseMapInfo<Value *>::getEmptyKey() &&
V != DenseMapInfo<Value *>::getTombstoneKey();
}
+private:
// Callbacks made from Value.
static void ValueIsDeleted(Value *V);
static void ValueIsRAUWd(Value *Old, Value *New);
HandleBaseKind getKind() const { return PrevPair.getInt(); }
void setPrevPtr(ValueHandleBase **Ptr) { PrevPair.setPointer(Ptr); }
- /// AddToExistingUseList - Add this ValueHandle to the use list for VP,
- /// where List is known to point into the existing use list.
+ /// AddToExistingUseList - Add this ValueHandle to the use list for VP, where
+ /// List is the address of either the head of the list or a Next node within
+ /// the existing use list.
void AddToExistingUseList(ValueHandleBase **List);
+ /// AddToExistingUseListAfter - Add this ValueHandle to the use list after
+ /// Node.
+ void AddToExistingUseListAfter(ValueHandleBase *Node);
+
/// AddToUseList - Add this ValueHandle to the use list for VP.
void AddToUseList();
/// RemoveFromUseList - Remove this ValueHandle from its current use list.
WeakVH(const WeakVH &RHS)
: ValueHandleBase(Weak, RHS) {}
+ Value *operator=(Value *RHS) {
+ return ValueHandleBase::operator=(RHS);
+ }
+ Value *operator=(const ValueHandleBase &RHS) {
+ return ValueHandleBase::operator=(RHS);
+ }
+
operator Value*() const {
return getValPtr();
}
template<> struct simplify_type<AssertingVH<Value> >
: public simplify_type<const AssertingVH<Value> > {};
+// Specialize DenseMapInfo to allow AssertingVH to participate in DenseMap.
+template<typename T>
+struct DenseMapInfo<AssertingVH<T> > {
+ typedef DenseMapInfo<T*> PointerInfo;
+ static inline AssertingVH<T> getEmptyKey() {
+ return AssertingVH<T>(PointerInfo::getEmptyKey());
+ }
+ static inline T* getTombstoneKey() {
+ return AssertingVH<T>(PointerInfo::getTombstoneKey());
+ }
+ static unsigned getHashValue(const AssertingVH<T> &Val) {
+ return PointerInfo::getHashValue(Val);
+ }
+ static bool isEqual(const AssertingVH<T> &LHS, const AssertingVH<T> &RHS) {
+ return LHS == RHS;
+ }
+};
+
+template <typename T>
+struct isPodLike<AssertingVH<T> > {
+#ifdef NDEBUG
+ static const bool value = true;
+#else
+ static const bool value = false;
+#endif
+};
+
+
+/// TrackingVH - This is a value handle that tracks a Value (or Value subclass),
+/// even across RAUW operations.
+///
+/// TrackingVH is designed for situations where a client needs to hold a handle
+/// to a Value (or subclass) across some operations which may move that value,
+/// but should never destroy it or replace it with some unacceptable type.
+///
+/// It is an error to do anything with a TrackingVH whose value has been
+/// destroyed, except to destruct it.
+///
+/// It is an error to attempt to replace a value with one of a type which is
+/// incompatible with any of its outstanding TrackingVHs.
+template<typename ValueTy>
+class TrackingVH : public ValueHandleBase {
+ void CheckValidity() const {
+ Value *VP = ValueHandleBase::getValPtr();
+
+ // Null is always ok.
+ if (!VP) return;
+
+ // Check that this value is valid (i.e., it hasn't been deleted). We
+ // explicitly delay this check until access to avoid requiring clients to be
+ // unnecessarily careful w.r.t. destruction.
+ assert(ValueHandleBase::isValid(VP) && "Tracked Value was deleted!");
+
+ // Check that the value is a member of the correct subclass. We would like
+ // to check this property on assignment for better debugging, but we don't
+ // want to require a virtual interface on this VH. Instead we allow RAUW to
+ // replace this value with a value of an invalid type, and check it here.
+ assert(isa<ValueTy>(VP) &&
+ "Tracked Value was replaced by one with an invalid type!");
+ }
+
+ ValueTy *getValPtr() const {
+ CheckValidity();
+ return (ValueTy*)ValueHandleBase::getValPtr();
+ }
+ void setValPtr(ValueTy *P) {
+ CheckValidity();
+ ValueHandleBase::operator=(GetAsValue(P));
+ }
+
+ // Convert a ValueTy*, which may be const, to the type the base
+ // class expects.
+ static Value *GetAsValue(Value *V) { return V; }
+ static Value *GetAsValue(const Value *V) { return const_cast<Value*>(V); }
+
+public:
+ TrackingVH() : ValueHandleBase(Tracking) {}
+ TrackingVH(ValueTy *P) : ValueHandleBase(Tracking, GetAsValue(P)) {}
+ TrackingVH(const TrackingVH &RHS) : ValueHandleBase(Tracking, RHS) {}
+
+ operator ValueTy*() const {
+ return getValPtr();
+ }
+
+ ValueTy *operator=(ValueTy *RHS) {
+ setValPtr(RHS);
+ return getValPtr();
+ }
+ ValueTy *operator=(const TrackingVH<ValueTy> &RHS) {
+ setValPtr(RHS.getValPtr());
+ return getValPtr();
+ }
+
+ ValueTy *operator->() const { return getValPtr(); }
+ ValueTy &operator*() const { return *getValPtr(); }
+};
+
+// Specialize simplify_type to allow TrackingVH to participate in
+// dyn_cast, isa, etc.
+template<typename From> struct simplify_type;
+template<> struct simplify_type<const TrackingVH<Value> > {
+ typedef Value* SimpleType;
+ static SimpleType getSimplifiedValue(const TrackingVH<Value> &AVH) {
+ return static_cast<Value *>(AVH);
+ }
+};
+template<> struct simplify_type<TrackingVH<Value> >
+ : public simplify_type<const TrackingVH<Value> > {};
+
/// CallbackVH - This is a value handle that allows subclasses to define
/// callbacks that run when the underlying Value has RAUW called on it or is
/// destroyed. This class can be used as the key of a map, as long as the user
/// _before_ any of the uses have actually been replaced. If WeakVH were
/// implemented as a CallbackVH, it would use this method to call
/// setValPtr(new_value). AssertingVH would do nothing in this method.
- virtual void allUsesReplacedWith(Value *new_value) {}
+ virtual void allUsesReplacedWith(Value *) {}
};
// Specialize simplify_type to allow CallbackVH to participate in