1 files changed, 16 insertions, 4 deletions
diff --git a/include/llvm/ADT/FoldingSet.h b/include/llvm/ADT/FoldingSet.h
index 1bcff3d..c62c47d 100644
--- a/include/llvm/ADT/FoldingSet.h
+++ b/include/llvm/ADT/FoldingSet.h
@@ -18,7 +18,7 @@
 
 #include "llvm/Support/DataTypes.h"
 #include "llvm/ADT/SmallVector.h"
-#include <string>
+#include "llvm/ADT/StringRef.h"
 #include <iterator>
 
 namespace llvm {
@@ -227,9 +227,7 @@ public:
   void AddInteger(long long I);
   void AddInteger(unsigned long long I);
   void AddBoolean(bool B) { AddInteger(B ? 1U : 0U); }
-  void AddString(const char* String, const char* End);
-  void AddString(const std::string &String);
-  void AddString(const char* String);
+  void AddString(StringRef String);
 
   template <typename T>
   inline void Add(const T& x) { FoldingSetTrait<T>::Profile(x, *this); }
@@ -439,6 +437,20 @@ public:
 };
 
 //===----------------------------------------------------------------------===//
+/// FastFoldingSetNode - This is a subclass of FoldingSetNode which stores
+/// a FoldingSetNodeID value rather than requiring the node to recompute it
+/// each time it is needed. This trades space for speed (which can be
+/// significant if the ID is long), and it also permits nodes to drop
+/// information that would otherwise only be required for recomputing an ID.
+class FastFoldingSetNode : public FoldingSetNode {
+  FoldingSetNodeID FastID;
+protected:
+  explicit FastFoldingSetNode(const FoldingSetNodeID &ID) : FastID(ID) {}
+public:
+  void Profile(FoldingSetNodeID& ID) { ID = FastID; }
+};
+
+//===----------------------------------------------------------------------===//
 // Partial specializations of FoldingSetTrait.
 
 template<typename T> struct FoldingSetTrait<T*> {