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diff --git a/include/llvm/IR/Argument.h b/include/llvm/IR/Argument.h
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+//===-- llvm/Argument.h - Definition of the Argument class ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the Argument class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_ARGUMENT_H
+#define LLVM_IR_ARGUMENT_H
+
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Value.h"
+
+namespace llvm {
+
+template<typename ValueSubClass, typename ItemParentClass>
+  class SymbolTableListTraits;
+
+/// \brief LLVM Argument representation
+///
+/// This class represents an incoming formal argument to a Function. A formal
+/// argument, since it is ``formal'', does not contain an actual value but
+/// instead represents the type, argument number, and attributes of an argument
+/// for a specific function. When used in the body of said function, the
+/// argument of course represents the value of the actual argument that the
+/// function was called with.
+class Argument : public Value, public ilist_node<Argument> {
+  virtual void anchor();
+  Function *Parent;
+
+  friend class SymbolTableListTraits<Argument, Function>;
+  void setParent(Function *parent);
+
+public:
+  /// \brief Constructor.
+  ///
+  /// If \p F is specified, the argument is inserted at the end of the argument
+  /// list for \p F.
+  explicit Argument(Type *Ty, const Twine &Name = "", Function *F = 0);
+
+  inline const Function *getParent() const { return Parent; }
+  inline       Function *getParent()       { return Parent; }
+
+  /// \brief Return the index of this formal argument in its containing
+  /// function.
+  ///
+  /// For example in "void foo(int a, float b)" a is 0 and b is 1.
+  unsigned getArgNo() const;
+
+  /// \brief Return true if this argument has the byval attribute on it in its
+  /// containing function.
+  bool hasByValAttr() const;
+
+  /// \brief If this is a byval argument, return its alignment.
+  unsigned getParamAlignment() const;
+
+  /// \brief Return true if this argument has the nest attribute on it in its
+  /// containing function.
+  bool hasNestAttr() const;
+
+  /// \brief Return true if this argument has the noalias attribute on it in its
+  /// containing function.
+  bool hasNoAliasAttr() const;
+
+  /// \brief Return true if this argument has the nocapture attribute on it in
+  /// its containing function.
+  bool hasNoCaptureAttr() const;
+
+  /// \brief Return true if this argument has the sret attribute on it in its
+  /// containing function.
+  bool hasStructRetAttr() const;
+
+  /// \brief Add a Attribute to an argument.
+  void addAttr(AttributeSet AS);
+
+  /// \brief Remove a Attribute from an argument.
+  void removeAttr(AttributeSet AS);
+
+  /// \brief Method for support type inquiry through isa, cast, and
+  /// dyn_cast.
+  static inline bool classof(const Value *V) {
+    return V->getValueID() == ArgumentVal;
+  }
+};
+
+} // End llvm namespace
+
+#endif