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diff --git a/include/llvm/CodeGen/MachineJumpTableInfo.h b/include/llvm/CodeGen/MachineJumpTableInfo.h
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+//===-- CodeGen/MachineJumpTableInfo.h - Abstract Jump Tables  --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// The MachineJumpTableInfo class keeps track of jump tables referenced by
+// lowered switch instructions in the MachineFunction.
+//
+// Instructions reference the address of these jump tables through the use of 
+// MO_JumpTableIndex values.  When emitting assembly or machine code, these 
+// virtual address references are converted to refer to the address of the 
+// function jump tables.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_MACHINEJUMPTABLEINFO_H
+#define LLVM_CODEGEN_MACHINEJUMPTABLEINFO_H
+
+#include <vector>
+#include <iosfwd>
+#include <cassert>
+
+namespace llvm {
+
+class MachineBasicBlock;
+class TargetData;
+
+/// MachineJumpTableEntry - One jump table in the jump table info.
+///
+struct MachineJumpTableEntry {
+  /// MBBs - The vector of basic blocks from which to create the jump table.
+  std::vector<MachineBasicBlock*> MBBs;
+  
+  explicit MachineJumpTableEntry(const std::vector<MachineBasicBlock*> &M)
+  : MBBs(M) {}
+};
+  
+class MachineJumpTableInfo {
+  unsigned EntrySize;
+  unsigned Alignment;
+  std::vector<MachineJumpTableEntry> JumpTables;
+public:
+  MachineJumpTableInfo(unsigned Size, unsigned Align)
+  : EntrySize(Size), Alignment(Align) {}
+    
+  /// getJumpTableIndex - Create a new jump table or return an existing one.
+  ///
+  unsigned getJumpTableIndex(const std::vector<MachineBasicBlock*> &DestBBs);
+  
+  /// isEmpty - Return true if there are no jump tables.
+  ///
+  bool isEmpty() const { return JumpTables.empty(); }
+
+  const std::vector<MachineJumpTableEntry> &getJumpTables() const {
+    return JumpTables;
+  }
+  
+  /// RemoveJumpTable - Mark the specific index as being dead.  This will cause
+  /// it to not be emitted.
+  void RemoveJumpTable(unsigned Idx) {
+    JumpTables[Idx].MBBs.clear();
+  }
+  
+  /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
+  /// the jump tables to branch to New instead.
+  bool ReplaceMBBInJumpTables(MachineBasicBlock *Old, MachineBasicBlock *New);
+
+  /// getEntrySize - Returns the size of an individual field in a jump table. 
+  ///
+  unsigned getEntrySize() const { return EntrySize; }
+  
+  /// getAlignment - returns the target's preferred alignment for jump tables
+  unsigned getAlignment() const { return Alignment; }
+  
+  /// print - Used by the MachineFunction printer to print information about
+  /// jump tables.  Implemented in MachineFunction.cpp
+  ///
+  void print(std::ostream &OS) const;
+  void print(std::ostream *OS) const { if (OS) print(*OS); }
+
+  /// dump - Call print(std::cerr) to be called from the debugger.
+  ///
+  void dump() const;
+};
+
+} // End llvm namespace
+
+#endif