/// void Profile(FoldingSetNodeID &ID) const {
/// ID.AddString(Name);
/// ID.AddInteger(Value);
-/// }
-/// ...
-/// };
+/// }
+/// ...
+/// };
///
/// To define the folding set itself use the FoldingSet template;
///
/// GetNodeProfile - Instantiations of the FoldingSet template implement
/// this function to gather data bits for the given node.
- virtual void GetNodeProfile(FoldingSetNodeID &ID, Node *N) const = 0;
+ virtual void GetNodeProfile(Node *N, FoldingSetNodeID &ID) const = 0;
+ /// NodeEquals - Instantiations of the FoldingSet template implement
+ /// this function to compare the given node with the given ID.
+ virtual bool NodeEquals(Node *N, const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID) const=0;
+ /// NodeEquals - Instantiations of the FoldingSet template implement
+ /// this function to compute a hash value for the given node.
+ virtual unsigned ComputeNodeHash(Node *N,
+ FoldingSetNodeID &TempID) const = 0;
};
//===----------------------------------------------------------------------===//
-/// FoldingSetTrait - This trait class is used to define behavior of how
-/// to "profile" (in the FoldingSet parlance) an object of a given type.
-/// The default behavior is to invoke a 'Profile' method on an object, but
-/// through template specialization the behavior can be tailored for specific
-/// types. Combined with the FoldingSetNodeWrapper class, one can add objects
-/// to FoldingSets that were not originally designed to have that behavior.
+
+template<typename T> struct FoldingSetTrait;
+
+/// DefaultFoldingSetTrait - This class provides default implementations
+/// for FoldingSetTrait implementations.
///
-template<typename T> struct FoldingSetTrait {
- static inline void Profile(const T& X, FoldingSetNodeID& ID) { X.Profile(ID);}
- static inline void Profile(T& X, FoldingSetNodeID& ID) { X.Profile(ID); }
- template <typename Ctx>
- static inline void Profile(T &X, FoldingSetNodeID &ID, Ctx Context) {
+template<typename T> struct DefaultFoldingSetTrait {
+ static void Profile(const T& X, FoldingSetNodeID& ID) {
+ X.Profile(ID);
+ }
+ static void Profile(T& X, FoldingSetNodeID& ID) {
+ X.Profile(ID);
+ }
+
+ // Equals - Test if the profile for X would match ID, using TempID
+ // to compute a temporary ID if necessary. The default implementation
+ // just calls Profile and does a regular comparison. Implementations
+ // can override this to provide more efficient implementations.
+ static inline bool Equals(T &X, const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID);
+
+ // ComputeHash - Compute a hash value for X, using TempID to
+ // compute a temporary ID if necessary. The default implementation
+ // just calls Profile and does a regular hash computation.
+ // Implementations can override this to provide more efficient
+ // implementations.
+ static inline unsigned ComputeHash(T &X, FoldingSetNodeID &TempID);
+};
+
+/// FoldingSetTrait - This trait class is used to define behavior of how
+/// to "profile" (in the FoldingSet parlance) an object of a given type.
+/// The default behavior is to invoke a 'Profile' method on an object, but
+/// through template specialization the behavior can be tailored for specific
+/// types. Combined with the FoldingSetNodeWrapper class, one can add objects
+/// to FoldingSets that were not originally designed to have that behavior.
+template<typename T> struct FoldingSetTrait
+ : public DefaultFoldingSetTrait<T> {};
+
+template<typename T, typename Ctx> struct ContextualFoldingSetTrait;
+
+/// DefaultContextualFoldingSetTrait - Like DefaultFoldingSetTrait, but
+/// for ContextualFoldingSets.
+template<typename T, typename Ctx>
+struct DefaultContextualFoldingSetTrait {
+ static void Profile(T &X, FoldingSetNodeID &ID, Ctx Context) {
X.Profile(ID, Context);
}
+ static inline bool Equals(T &X, const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID, Ctx Context);
+ static inline unsigned ComputeHash(T &X, FoldingSetNodeID &TempID,
+ Ctx Context);
};
+/// ContextualFoldingSetTrait - Like FoldingSetTrait, but for
+/// ContextualFoldingSets.
+template<typename T, typename Ctx> struct ContextualFoldingSetTrait
+ : public DefaultContextualFoldingSetTrait<T, Ctx> {};
+
//===--------------------------------------------------------------------===//
/// FoldingSetNodeIDRef - This class describes a reference to an interned
/// FoldingSetNodeID, which can be a useful to store node id data rather
/// is often much larger than necessary, and the possibility of heap
/// allocation means it requires a non-trivial destructor call.
class FoldingSetNodeIDRef {
- unsigned* Data;
+ const unsigned* Data;
size_t Size;
public:
FoldingSetNodeIDRef() : Data(0), Size(0) {}
- FoldingSetNodeIDRef(unsigned *D, size_t S) : Data(D), Size(S) {}
+ FoldingSetNodeIDRef(const unsigned *D, size_t S) : Data(D), Size(S) {}
+
+ /// ComputeHash - Compute a strong hash value for this FoldingSetNodeIDRef,
+ /// used to lookup the node in the FoldingSetImpl.
+ unsigned ComputeHash() const;
- unsigned *getData() const { return Data; }
+ bool operator==(FoldingSetNodeIDRef) const;
+
+ const unsigned *getData() const { return Data; }
size_t getSize() const { return Size; }
};
inline void Add(const T& x) { FoldingSetTrait<T>::Profile(x, *this); }
/// clear - Clear the accumulated profile, allowing this FoldingSetNodeID
- /// object to be used to compute a new profile.
+ /// object to be used to compute a new profile.
inline void clear() { Bits.clear(); }
/// ComputeHash - Compute a strong hash value for this FoldingSetNodeID, used
- /// to lookup the node in the FoldingSetImpl.
+ /// to lookup the node in the FoldingSetImpl.
unsigned ComputeHash() const;
/// operator== - Used to compare two nodes to each other.
///
bool operator==(const FoldingSetNodeID &RHS) const;
+ bool operator==(const FoldingSetNodeIDRef RHS) const;
/// Intern - Copy this node's data to a memory region allocated from the
/// given allocator and return a FoldingSetNodeIDRef describing the
template<class T> class FoldingSetIterator;
template<class T> class FoldingSetBucketIterator;
+// Definitions of FoldingSetTrait and ContextualFoldingSetTrait functions, which
+// require the definition of FoldingSetNodeID.
+template<typename T>
+inline bool
+DefaultFoldingSetTrait<T>::Equals(T &X, const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID) {
+ FoldingSetTrait<T>::Profile(X, TempID);
+ return TempID == ID;
+}
+template<typename T>
+inline unsigned
+DefaultFoldingSetTrait<T>::ComputeHash(T &X, FoldingSetNodeID &TempID) {
+ FoldingSetTrait<T>::Profile(X, TempID);
+ return TempID.ComputeHash();
+}
+template<typename T, typename Ctx>
+inline bool
+DefaultContextualFoldingSetTrait<T, Ctx>::Equals(T &X,
+ const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID,
+ Ctx Context) {
+ ContextualFoldingSetTrait<T, Ctx>::Profile(X, TempID, Context);
+ return TempID == ID;
+}
+template<typename T, typename Ctx>
+inline unsigned
+DefaultContextualFoldingSetTrait<T, Ctx>::ComputeHash(T &X,
+ FoldingSetNodeID &TempID,
+ Ctx Context) {
+ ContextualFoldingSetTrait<T, Ctx>::Profile(X, TempID, Context);
+ return TempID.ComputeHash();
+}
+
//===----------------------------------------------------------------------===//
/// FoldingSet - This template class is used to instantiate a specialized
/// implementation of the folding set to the node class T. T must be a
private:
/// GetNodeProfile - Each instantiatation of the FoldingSet needs to provide a
/// way to convert nodes into a unique specifier.
- virtual void GetNodeProfile(FoldingSetNodeID &ID, Node *N) const {
+ virtual void GetNodeProfile(Node *N, FoldingSetNodeID &ID) const {
+ T *TN = static_cast<T *>(N);
+ FoldingSetTrait<T>::Profile(*TN, ID);
+ }
+ /// NodeEquals - Instantiations may optionally provide a way to compare a
+ /// node with a specified ID.
+ virtual bool NodeEquals(Node *N, const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID) const {
T *TN = static_cast<T *>(N);
- FoldingSetTrait<T>::Profile(*TN,ID);
+ return FoldingSetTrait<T>::Equals(*TN, ID, TempID);
+ }
+ /// NodeEquals - Instantiations may optionally provide a way to compute a
+ /// hash value directly from a node.
+ virtual unsigned ComputeNodeHash(Node *N,
+ FoldingSetNodeID &TempID) const {
+ T *TN = static_cast<T *>(N);
+ return FoldingSetTrait<T>::ComputeHash(*TN, TempID);
}
public:
/// GetNodeProfile - Each instantiatation of the FoldingSet needs to provide a
/// way to convert nodes into a unique specifier.
- virtual void GetNodeProfile(FoldingSetNodeID &ID,
- FoldingSetImpl::Node *N) const {
+ virtual void GetNodeProfile(FoldingSetImpl::Node *N,
+ FoldingSetNodeID &ID) const {
T *TN = static_cast<T *>(N);
-
- // We must use explicit template arguments in case Ctx is a
- // reference type.
- FoldingSetTrait<T>::template Profile<Ctx>(*TN, ID, Context);
+ ContextualFoldingSetTrait<T, Ctx>::Profile(*TN, ID, Context);
+ }
+ virtual bool NodeEquals(FoldingSetImpl::Node *N,
+ const FoldingSetNodeID &ID,
+ FoldingSetNodeID &TempID) const {
+ T *TN = static_cast<T *>(N);
+ return ContextualFoldingSetTrait<T, Ctx>::Equals(*TN, ID, TempID, Context);
+ }
+ virtual unsigned ComputeNodeHash(FoldingSetImpl::Node *N,
+ FoldingSetNodeID &TempID) const {
+ T *TN = static_cast<T *>(N);
+ return ContextualFoldingSetTrait<T, Ctx>::ComputeHash(*TN, TempID, Context);
}
public:
//===----------------------------------------------------------------------===//
/// FoldingSetBucketIteratorImpl - This is the common bucket iterator support
-/// shared by all folding sets, which knows how to walk a particular bucket
-/// of a folding set hash table.
+/// shared by all folding sets, which knows how to walk a particular bucket
+/// of a folding set hash table.
class FoldingSetBucketIteratorImpl {
protected:
protected:
explicit FastFoldingSetNode(const FoldingSetNodeID &ID) : FastID(ID) {}
public:
- void Profile(FoldingSetNodeID& ID) { ID = FastID; }
+ void Profile(FoldingSetNodeID& ID) const { ID = FastID; }
};
//===----------------------------------------------------------------------===//
static inline void Profile(const T* X, FoldingSetNodeID& ID) {
ID.AddPointer(X);
}
- static inline void Profile(T* X, FoldingSetNodeID& ID) {
- ID.AddPointer(X);
- }
};
template<typename T> struct FoldingSetTrait<const T*> {
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