/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const MDString *) { return true; }
static bool classof(const Value *V) {
- return V->getValueID() == MDStringVal;
+ return V->getValueID() == MDStringVal || V->getValueID() == MDNodeVal;
}
};
//===----------------------------------------------------------------------===//
/// MDNode - a tuple of other values.
-/// These contain a list of the Constants that represent the metadata. The
-/// operand list is always empty, query the element list instead.
-///
-/// This class will attempt to keep track of values as they are modified. When
-/// a value is replaced the element will be replaced with it, and when the
-/// value is deleted the element is set to a null pointer. In order to preserve
-/// structural equivalence while the elements mutate, the MDNode may call
-/// replaceAllUsesWith on itself. Because of this, users of MDNode must use a
-/// WeakVH or CallbackVH to hold the node pointer if there is a chance that one
-/// of the elements held by the node may change.
+/// These contain a list of the values that represent the metadata.
///
-class MDNode : public Constant, public FoldingSetNode {
+class MDNode : public MetadataBase, public FoldingSetNode {
MDNode(const MDNode &); // DO NOT IMPLEMENT
friend class LLVMContextImpl;
- friend class ElementVH;
- struct ElementVH : public CallbackVH {
- MDNode *OwningNode;
-
- ElementVH(Value *V, MDNode *Parent)
- : CallbackVH(V), OwningNode(Parent) {}
-
- ~ElementVH() {}
-
- /// deleted - Set this entry in the MDNode to 'null'. This will reallocate
- /// the MDNode.
- virtual void deleted() {
- OwningNode->replaceElement(this->operator Value*(), 0);
- }
-
- /// allUsesReplacedWith - Modify the MDNode by replacing this entry with
- /// new_value. This will reallocate the MDNode.
- virtual void allUsesReplacedWith(Value *new_value) {
- OwningNode->replaceElement(this->operator Value*(), new_value);
- }
- };
-
void replaceElement(Value *From, Value *To);
- SmallVector<ElementVH, 4> Node;
- typedef SmallVectorImpl<ElementVH>::iterator elem_iterator;
+ SmallVector<WeakVH, 4> Node;
+ typedef SmallVectorImpl<WeakVH>::iterator elem_iterator;
protected:
explicit MDNode(Value*const* Vals, unsigned NumVals);
public:
- typedef SmallVectorImpl<ElementVH>::const_iterator const_elem_iterator;
+ typedef SmallVectorImpl<WeakVH>::const_iterator const_elem_iterator;
Value *getElement(unsigned i) const {
return Node[i];
/// duplicates
void Profile(FoldingSetNodeID &ID) const;
- virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
llvm_unreachable("This should never be called because MDNodes have no ops");
}