[Interpreter] Add support for parameter variables.

src/objects.h

 // Copyright 2012 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 4085 matching lines @@
     return OBJECT_POINTER_ALIGN(kHeaderSize + length);
   }
 
   // Setter and getter
   inline byte get(int index);
   inline void set(int index, byte value);
 
   // Returns data start address.
   inline Address GetFirstBytecodeAddress();
 
-  // Accessors for frame size and the number of locals
+  // Accessors for frame size.
   inline int frame_size() const;
-  inline void set_frame_size(int value);
+  inline void set_frame_size(int frame_size);
+
+  // Accessors for parameter count (including implicit 'this' receiver).
+  inline int parameter_count() const;
+  inline void set_parameter_count(int number_of_parameters);
 
   DECLARE_CAST(BytecodeArray)
 
   // Dispatched behavior.
   inline int BytecodeArraySize();
 
   DECLARE_PRINTER(BytecodeArray)
   DECLARE_VERIFIER(BytecodeArray)
 
   void Disassemble(std::ostream& os);
 
   // Layout description.
   static const int kFrameSizeOffset = FixedArrayBase::kHeaderSize;
-  static const int kHeaderSize = kFrameSizeOffset + kIntSize;
+  static const int kParameterSizeOffset = kFrameSizeOffset + kIntSize;
+  static const int kHeaderSize = kParameterSizeOffset + kIntSize;
 
   static const int kAlignedSize = OBJECT_POINTER_ALIGN(kHeaderSize);
 
   // Maximal memory consumption for a single BytecodeArray.
   static const int kMaxSize = 512 * MB;
   // Maximal length of a single BytecodeArray.
   static const int kMaxLength = kMaxSize - kHeaderSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeArray);
@@ skipping 6162 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_