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diff --git a/include/llvm/IR/Metadata.h b/include/llvm/IR/Metadata.h
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--- /dev/null
+++ b/include/llvm/IR/Metadata.h
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+//===-- llvm/Metadata.h - Metadata definitions ------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// @file
+/// This file contains the declarations for metadata subclasses.
+/// They represent the different flavors of metadata that live in LLVM.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_METADATA_H
+#define LLVM_METADATA_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/IR/Value.h"
+
+namespace llvm {
+class Constant;
+class Instruction;
+class LLVMContext;
+class Module;
+template <typename T> class SmallVectorImpl;
+template<typename ValueSubClass, typename ItemParentClass>
+  class SymbolTableListTraits;
+  
+  
+//===----------------------------------------------------------------------===//
+/// MDString - a single uniqued string.
+/// These are used to efficiently contain a byte sequence for metadata.
+/// MDString is always unnamed.
+class MDString : public Value {
+  virtual void anchor();
+  MDString(const MDString &) LLVM_DELETED_FUNCTION;
+
+  explicit MDString(LLVMContext &C);
+public:
+  static MDString *get(LLVMContext &Context, StringRef Str);
+  static MDString *get(LLVMContext &Context, const char *Str) {
+    return get(Context, Str ? StringRef(Str) : StringRef());
+  }
+
+  StringRef getString() const { return getName(); }
+
+  unsigned getLength() const { return (unsigned)getName().size(); }
+
+  typedef StringRef::iterator iterator;
+  
+  /// begin() - Pointer to the first byte of the string.
+  iterator begin() const { return getName().begin(); }
+
+  /// end() - Pointer to one byte past the end of the string.
+  iterator end() const { return getName().end(); }
+
+  /// Methods for support type inquiry through isa, cast, and dyn_cast:
+  static bool classof(const Value *V) {
+    return V->getValueID() == MDStringVal;
+  }
+};
+
+  
+class MDNodeOperand;
+  
+//===----------------------------------------------------------------------===//
+/// MDNode - a tuple of other values.
+class MDNode : public Value, public FoldingSetNode {
+  MDNode(const MDNode &) LLVM_DELETED_FUNCTION;
+  void operator=(const MDNode &) LLVM_DELETED_FUNCTION;
+  friend class MDNodeOperand;
+  friend class LLVMContextImpl;
+  friend struct FoldingSetTrait<MDNode>;
+
+  /// Hash - If the MDNode is uniqued cache the hash to speed up lookup.
+  unsigned Hash;
+
+  /// NumOperands - This many 'MDNodeOperand' items are co-allocated onto the
+  /// end of this MDNode.
+  unsigned NumOperands;
+  
+  // Subclass data enums.
+  enum {
+    /// FunctionLocalBit - This bit is set if this MDNode is function local.
+    /// This is true when it (potentially transitively) contains a reference to
+    /// something in a function, like an argument, basicblock, or instruction.
+    FunctionLocalBit = 1 << 0,
+    
+    /// NotUniquedBit - This is set on MDNodes that are not uniqued because they
+    /// have a null operand.
+    NotUniquedBit    = 1 << 1,
+    
+    /// DestroyFlag - This bit is set by destroy() so the destructor can assert
+    /// that the node isn't being destroyed with a plain 'delete'.
+    DestroyFlag      = 1 << 2
+  };
+  
+  // FunctionLocal enums.
+  enum FunctionLocalness {
+    FL_Unknown = -1,
+    FL_No = 0,
+    FL_Yes = 1
+  };
+  
+  /// replaceOperand - Replace each instance of F from the operand list of this 
+  /// node with T.
+  void replaceOperand(MDNodeOperand *Op, Value *NewVal);
+  ~MDNode();
+
+  MDNode(LLVMContext &C, ArrayRef<Value*> Vals, bool isFunctionLocal);
+  
+  static MDNode *getMDNode(LLVMContext &C, ArrayRef<Value*> Vals,
+                           FunctionLocalness FL, bool Insert = true);
+public:
+  // Constructors and destructors.
+  static MDNode *get(LLVMContext &Context, ArrayRef<Value*> Vals);
+  // getWhenValsUnresolved - Construct MDNode determining function-localness
+  // from isFunctionLocal argument, not by analyzing Vals.
+  static MDNode *getWhenValsUnresolved(LLVMContext &Context,
+                                       ArrayRef<Value*> Vals,
+                                       bool isFunctionLocal);
+                                       
+  static MDNode *getIfExists(LLVMContext &Context, ArrayRef<Value*> Vals);
+
+  /// getTemporary - Return a temporary MDNode, for use in constructing
+  /// cyclic MDNode structures. A temporary MDNode is not uniqued,
+  /// may be RAUW'd, and must be manually deleted with deleteTemporary.
+  static MDNode *getTemporary(LLVMContext &Context, ArrayRef<Value*> Vals);
+
+  /// deleteTemporary - Deallocate a node created by getTemporary. The
+  /// node must not have any users.
+  static void deleteTemporary(MDNode *N);
+
+  /// replaceOperandWith - Replace a specific operand.
+  void replaceOperandWith(unsigned i, Value *NewVal);
+  
+  /// getOperand - Return specified operand.
+  Value *getOperand(unsigned i) const;
+  
+  /// getNumOperands - Return number of MDNode operands.
+  unsigned getNumOperands() const { return NumOperands; }
+  
+  /// isFunctionLocal - Return whether MDNode is local to a function.
+  bool isFunctionLocal() const {
+    return (getSubclassDataFromValue() & FunctionLocalBit) != 0;
+  }
+  
+  // getFunction - If this metadata is function-local and recursively has a
+  // function-local operand, return the first such operand's parent function.
+  // Otherwise, return null. getFunction() should not be used for performance-
+  // critical code because it recursively visits all the MDNode's operands.  
+  const Function *getFunction() const;
+
+  /// Profile - calculate a unique identifier for this MDNode to collapse
+  /// duplicates
+  void Profile(FoldingSetNodeID &ID) const;
+
+  /// Methods for support type inquiry through isa, cast, and dyn_cast:
+  static bool classof(const Value *V) {
+    return V->getValueID() == MDNodeVal;
+  }
+
+  /// Methods for metadata merging.
+  static MDNode *getMostGenericTBAA(MDNode *A, MDNode *B);
+  static MDNode *getMostGenericFPMath(MDNode *A, MDNode *B);
+  static MDNode *getMostGenericRange(MDNode *A, MDNode *B);
+private:
+  // destroy - Delete this node.  Only when there are no uses.
+  void destroy();
+
+  bool isNotUniqued() const { 
+    return (getSubclassDataFromValue() & NotUniquedBit) != 0;
+  }
+  void setIsNotUniqued();
+  
+  // Shadow Value::setValueSubclassData with a private forwarding method so that
+  // any future subclasses cannot accidentally use it.
+  void setValueSubclassData(unsigned short D) {
+    Value::setValueSubclassData(D);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// NamedMDNode - a tuple of MDNodes. Despite its name, a NamedMDNode isn't
+/// itself an MDNode. NamedMDNodes belong to modules, have names, and contain
+/// lists of MDNodes.
+class NamedMDNode : public ilist_node<NamedMDNode> {
+  friend class SymbolTableListTraits<NamedMDNode, Module>;
+  friend struct ilist_traits<NamedMDNode>;
+  friend class LLVMContextImpl;
+  friend class Module;
+  NamedMDNode(const NamedMDNode &) LLVM_DELETED_FUNCTION;
+
+  std::string Name;
+  Module *Parent;
+  void *Operands; // SmallVector<TrackingVH<MDNode>, 4>
+
+  void setParent(Module *M) { Parent = M; }
+
+  explicit NamedMDNode(const Twine &N);
+
+public:
+  /// eraseFromParent - Drop all references and remove the node from parent
+  /// module.
+  void eraseFromParent();
+
+  /// dropAllReferences - Remove all uses and clear node vector.
+  void dropAllReferences();
+
+  /// ~NamedMDNode - Destroy NamedMDNode.
+  ~NamedMDNode();
+
+  /// getParent - Get the module that holds this named metadata collection.
+  inline Module *getParent() { return Parent; }
+  inline const Module *getParent() const { return Parent; }
+
+  /// getOperand - Return specified operand.
+  MDNode *getOperand(unsigned i) const;
+  
+  /// getNumOperands - Return the number of NamedMDNode operands.
+  unsigned getNumOperands() const;
+
+  /// addOperand - Add metadata operand.
+  void addOperand(MDNode *M);
+
+  /// getName - Return a constant reference to this named metadata's name.
+  StringRef getName() const;
+
+  /// print - Implement operator<< on NamedMDNode.
+  void print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW = 0) const;
+
+  /// dump() - Allow printing of NamedMDNodes from the debugger.
+  void dump() const;
+};
+
+} // end llvm namespace
+
+#endif