[Intepreter] Extend and move Register class.

src/interpreter/bytecodes.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_INTERPRETER_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <iosfwd>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 87 matching lines @@
 
   // Returns the size of the bytecode including its operands.
   static int Size(Bytecode bytecode);
 
   // The maximum number of operands across all bytecodes.
   static int MaximumNumberOfOperands();
 
   // Maximum size of a bytecode and its operands.
   static int MaximumSize();
 
+  // Returns the operand value for register with the specified index.
+  static uint8_t RegisterIndexToOperand(int index);
+
+  // Returns the register index for a register operand.
+  static int RegisterIndexFromOperand(uint8_t operand);
+
+  // Returns the operand value for parameter with the specified index.
+  static uint8_t ParameterIndexToOperand(int index, int number_of_parameters);
+
+  // Returns the maximum number of parameters including this.
+  static int MaximumNumberOfParameters();
+
+  // Returns the parameter index for a parameter operand.
+  static int ParameterIndexFromOperand(uint8_t operand,
+                                       int number_of_parameters);
+
   // Decode a single bytecode and operands to |os|.
-  static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start);
+  static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start,
+                              int number_of_parameters);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes);
 };
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_