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diff --git a/lib/Target/ARM/Disassembler/ARMDisassembler.h b/lib/Target/ARM/Disassembler/ARMDisassembler.h
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+++ b/lib/Target/ARM/Disassembler/ARMDisassembler.h
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+//===- ARMDisassembler.h - Disassembler for ARM/Thumb ISA -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is part of the ARM Disassembler.
+// It contains the header for ARMDisassembler and ThumbDisassembler, both are
+// subclasses of MCDisassembler.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ARMDISASSEMBLER_H
+#define ARMDISASSEMBLER_H
+
+#include "llvm/MC/MCDisassembler.h"
+
+namespace llvm {
+  
+class MCInst;
+class MemoryObject;
+class raw_ostream;
+  
+/// ARMDisassembler - ARM disassembler for all ARM platforms.
+class ARMDisassembler : public MCDisassembler {
+public:
+  /// Constructor     - Initializes the disassembler.
+  ///
+  ARMDisassembler() :
+    MCDisassembler() {
+  }
+
+  ~ARMDisassembler() {
+  }
+
+  /// getInstruction - See MCDisassembler.
+  bool getInstruction(MCInst &instr,
+                      uint64_t &size,
+                      const MemoryObject &region,
+                      uint64_t address,
+                      raw_ostream &vStream) const;
+private:
+};
+
+// Forward declaration.
+class ARMBasicMCBuilder;
+
+/// Session - Keep track of the IT Block progression.
+class Session {
+  friend class ARMBasicMCBuilder;
+public:
+  Session() : ITCounter(0), ITState(0) {}
+  ~Session() {}
+  /// InitIT - Initializes ITCounter/ITState.
+  void InitIT(unsigned short bits7_0);
+  /// UpdateIT - Updates ITCounter/ITState as IT Block progresses.
+  void UpdateIT();
+
+private:
+  unsigned ITCounter; // Possible values: 0, 1, 2, 3, 4.
+  unsigned ITState;   // A2.5.2 Consists of IT[7:5] and IT[4:0] initially.
+};
+
+/// ThumbDisassembler - Thumb disassembler for all ARM platforms.
+class ThumbDisassembler : public MCDisassembler {
+public:
+  /// Constructor     - Initializes the disassembler.
+  ///
+  ThumbDisassembler() :
+    MCDisassembler(), SO() {
+  }
+
+  ~ThumbDisassembler() {
+  }
+
+  /// getInstruction - See MCDisassembler.
+  bool getInstruction(MCInst &instr,
+                      uint64_t &size,
+                      const MemoryObject &region,
+                      uint64_t address,
+                      raw_ostream &vStream) const;
+private:
+  Session SO;
+};
+
+} // namespace llvm
+  
+#endif