As a first step towards implementing thumb2, add code for...

src/arm/simulator-arm.h

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 215 matching lines @@
   void DecodeType6(Instr* instr);
   void DecodeType7(Instr* instr);
   void DecodeUnconditional(Instr* instr);
 
   // Support for VFP.
   void DecodeTypeVFP(Instr* instr);
   void DecodeType6CoprocessorIns(Instr* instr);
 
   // Executes one instruction.
   void InstructionDecode(Instr* instr);
+  void InstructionDecode(ThumbInstr* instr);
 
   // Runtime call support.
   static void* RedirectExternalReference(void* external_function,
                                          bool fp_return);
 
   // For use in calls that take two double values, constructed from r0, r1, r2
   // and r3.
   void GetFpArgs(double* x, double* y);
   void SetFpResult(const double& result);
   void TrashCallerSaveRegisters();
@@ skipping 16 matching lines @@
   bool inv_op_vfp_flag_;
   bool div_zero_vfp_flag_;
   bool overflow_vfp_flag_;
   bool underflow_vfp_flag_;
   bool inexact_vfp_flag_;
 
   // Simulator support.
   char* stack_;
   bool pc_modified_;
   int icount_;
+  bool thumb_mode_;
   static bool initialized_;
 
   // Registered breakpoints.
   Instr* break_pc_;
   instr_t break_instr_;
 };
 
 } }  // namespace assembler::arm
 
 
@@ skipping 15 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     assembler::arm::Simulator::current()->PopAddress();
   }
 };
 
 
 #endif  // defined(__arm__)
 
 #endif  // V8_ARM_SIMULATOR_ARM_H_