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diff --git a/include/llvm/IR/AsmWriter.h b/include/llvm/IR/AsmWriter.h
new file mode 100644
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+++ b/include/llvm/IR/AsmWriter.h
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+//===-- llvm/IR/AsmWriter.h - Printing LLVM IR as an assembly file - C++ --===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This files defines the interface for the AssemblyWriter class used to print
+// LLVM IR and various helper classes that are used in printing.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_ASSEMBLYWRITER_H
+#define LLVM_IR_ASSEMBLYWRITER_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/TypeFinder.h"
+#include "llvm/Support/FormattedStream.h"
+
+namespace llvm {
+
+class BasicBlock;
+class Function;
+class GlobalValue;
+class Module;
+class NamedMDNode;
+class Value;
+class SlotTracker;
+
+/// Create a new SlotTracker for a Module 
+SlotTracker *createSlotTracker(const Module *M);
+
+//===----------------------------------------------------------------------===//
+// TypePrinting Class: Type printing machinery
+//===----------------------------------------------------------------------===//
+
+class TypePrinting {
+  TypePrinting(const TypePrinting &) LLVM_DELETED_FUNCTION;
+  void operator=(const TypePrinting&) LLVM_DELETED_FUNCTION;
+public:
+
+  /// NamedTypes - The named types that are used by the current module.
+  TypeFinder NamedTypes;
+
+  /// NumberedTypes - The numbered types, along with their value.
+  DenseMap<StructType*, unsigned> NumberedTypes;
+
+
+  TypePrinting() {}
+  ~TypePrinting() {}
+
+  void incorporateTypes(const Module &M);
+
+  void print(Type *Ty, raw_ostream &OS);
+
+  void printStructBody(StructType *Ty, raw_ostream &OS);
+};
+
+class AssemblyWriter {
+protected:
+  formatted_raw_ostream &Out;
+  const Module *TheModule;
+
+private:
+  OwningPtr<SlotTracker> ModuleSlotTracker;
+  SlotTracker &Machine;
+  TypePrinting TypePrinter;
+  AssemblyAnnotationWriter *AnnotationWriter;
+
+public:
+  /// Construct an AssemblyWriter with an external SlotTracker
+  AssemblyWriter(formatted_raw_ostream &o, SlotTracker &Mac,
+                 const Module *M, AssemblyAnnotationWriter *AAW);
+
+  /// Construct an AssemblyWriter with an internally allocated SlotTracker
+  AssemblyWriter(formatted_raw_ostream &o, const Module *M,
+                 AssemblyAnnotationWriter *AAW);
+
+  virtual ~AssemblyWriter();
+
+  virtual void printMDNodeBody(const MDNode *MD);
+  virtual void printNamedMDNode(const NamedMDNode *NMD);
+
+  virtual void printModule(const Module *M);
+
+  virtual void writeOperand(const Value *Op, bool PrintType);
+  virtual void writeParamOperand(const Value *Operand, AttributeSet Attrs,unsigned Idx);
+  virtual void writeAtomic(AtomicOrdering Ordering, SynchronizationScope SynchScope);
+
+  virtual void writeAllMDNodes();
+  virtual void writeMDNode(unsigned Slot, const MDNode *Node);
+  virtual void writeAllAttributeGroups();
+
+  virtual void printTypeIdentities();
+  virtual void printGlobal(const GlobalVariable *GV);
+  virtual void printAlias(const GlobalAlias *GV);
+  virtual void printFunction(const Function *F);
+  virtual void printArgument(const Argument *FA, AttributeSet Attrs, unsigned Idx);
+  virtual void printBasicBlock(const BasicBlock *BB);
+  virtual void printInstructionLine(const Instruction &I);
+  virtual void printInstruction(const Instruction &I);
+
+private:
+  void init();
+
+  // printInfoComment - Print a little comment after the instruction indicating
+  // which slot it occupies.
+  void printInfoComment(const Value &V);
+};
+
+} // namespace llvm
+
+#endif //LLVM_IR_ASMWRITER_H