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diff --git a/llvm/lib/IR/AttributeImpl.h b/llvm/lib/IR/AttributeImpl.h
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+//===-- AttributeImpl.h - Attribute Internals -------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file defines various helper methods and classes used by
+/// LLVMContextImpl for creating and managing attributes.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ATTRIBUTESIMPL_H
+#define LLVM_ATTRIBUTESIMPL_H
+
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/Attributes.h"
+
+namespace llvm {
+
+class Constant;
+class LLVMContext;
+
+//===----------------------------------------------------------------------===//
+/// \class
+/// \brief This class represents a single, uniqued attribute. That attribute
+/// could be a single enum, a tuple, or a string.
+class AttributeImpl : public FoldingSetNode {
+  Constant *Data;
+  SmallVector<Constant*, 0> Vals;
+public:
+  explicit AttributeImpl(LLVMContext &C, uint64_t data);
+  explicit AttributeImpl(LLVMContext &C, Attribute::AttrKind data);
+  AttributeImpl(LLVMContext &C, Attribute::AttrKind data,
+                ArrayRef<Constant*> values);
+  AttributeImpl(LLVMContext &C, StringRef data);
+
+  ArrayRef<Constant*> getValues() const {
+    return Vals;
+  }
+
+  bool contains(Attribute::AttrKind Kind) const;
+  bool contains(StringRef Kind) const;
+
+  bool hasAttribute(uint64_t A) const;
+
+  bool hasAttributes() const;
+  bool hasAttributes(const Attribute &A) const;
+
+  uint64_t getAlignment() const;
+  uint64_t getStackAlignment() const;
+
+  bool operator==(Attribute::AttrKind Kind) const {
+    return contains(Kind);
+  }
+  bool operator!=(Attribute::AttrKind Kind) const {
+    return !contains(Kind);
+  }
+
+  bool operator==(StringRef Kind) const {
+    return contains(Kind);
+  }
+  bool operator!=(StringRef Kind) const {
+    return !contains(Kind);
+  }
+
+  uint64_t getBitMask() const;         // FIXME: Remove.
+
+  static uint64_t getAttrMask(uint64_t Val);
+
+  void Profile(FoldingSetNodeID &ID) const {
+    Profile(ID, Data, Vals);
+  }
+  static void Profile(FoldingSetNodeID &ID, Constant *Data,
+                      ArrayRef<Constant*> Vals) {
+    ID.AddPointer(Data);
+    for (ArrayRef<Constant*>::iterator I = Vals.begin(), E = Vals.end();
+         I != E; ++I)
+      ID.AddPointer(*I);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// \class
+/// \brief This class represents a set of attributes.
+class AttributeSetImpl : public FoldingSetNode {
+  // AttributesSet is uniqued, these should not be publicly available.
+  void operator=(const AttributeSetImpl &) LLVM_DELETED_FUNCTION;
+  AttributeSetImpl(const AttributeSetImpl &) LLVM_DELETED_FUNCTION;
+public:
+  LLVMContext &Context;
+  SmallVector<AttributeWithIndex, 4> Attrs;
+
+  AttributeSetImpl(LLVMContext &C, ArrayRef<AttributeWithIndex> attrs)
+    : Context(C), Attrs(attrs.begin(), attrs.end()) {}
+
+  void Profile(FoldingSetNodeID &ID) const {
+    Profile(ID, Attrs);
+  }
+  static void Profile(FoldingSetNodeID &ID, ArrayRef<AttributeWithIndex> Attrs){
+    for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
+      ID.AddInteger(Attrs[i].Attrs.getBitMask());
+      ID.AddInteger(Attrs[i].Index);
+    }
+  }
+};
+
+} // end llvm namespace
+
+#endif