[Interpreter] Remove register file register and replace with LoadParentFramePointer.

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.
 // Do not include anything from src/interpreter here!
+#include "src/frames.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
 #define INVALID_OPERAND_TYPE_LIST(V) V(None, OperandTypeInfo::kNone)
 
 #define REGISTER_INPUT_OPERAND_TYPE_LIST(V)         \
   V(MaybeReg, OperandTypeInfo::kScalableSignedByte) \
@@ skipping 306 matching lines @@
 
 // An interpreter Register which is located in the function's Register file
 // in its stack-frame. Register hold parameters, this, and expression values.
 class Register {
  public:
   explicit Register(int index = kInvalidIndex) : index_(index) {}
 
   int index() const { return index_; }
   bool is_parameter() const { return index() < 0; }
   bool is_valid() const { return index_ != kInvalidIndex; }
-  bool is_byte_operand() const;
-  bool is_short_operand() const;
 
   static Register FromParameterIndex(int index, int parameter_count);
   int ToParameterIndex(int parameter_count) const;
 
   // Returns an invalid register.
   static Register invalid_value() { return Register(); }
 
   // Returns the register for the function's closure object.
   static Register function_closure();
   bool is_function_closure() const;
 
   // Returns the register which holds the current context object.
   static Register current_context();
   bool is_current_context() const;
 
   // Returns the register for the incoming new target value.
   static Register new_target();
   bool is_new_target() const;
 
-  int32_t ToOperand() const { return -index_; }
-  static Register FromOperand(int32_t operand) { return Register(-operand); }
+  // Returns the register for the bytecode array.
+  static Register bytecode_array();
+  bool is_bytecode_array() const;
+
+  // Returns the register for the saved bytecode offset.
+  static Register bytecode_offset();
+  bool is_bytecode_offset() const;
+
+  OperandSize SizeOfOperand() const;
+
+  int32_t ToOperand() const { return kRegisterFileStartOffset - index_; }
+  static Register FromOperand(int32_t operand) {
+    return Register(kRegisterFileStartOffset - operand);
+  }
 
   static bool AreContiguous(Register reg1, Register reg2,
                             Register reg3 = Register(),
                             Register reg4 = Register(),
                             Register reg5 = Register());
 
   std::string ToString(int parameter_count);
 
   bool operator==(const Register& other) const {
     return index() == other.index();
   }
   bool operator!=(const Register& other) const {
     return index() != other.index();
   }
   bool operator<(const Register& other) const {
     return index() < other.index();
   }
   bool operator<=(const Register& other) const {
     return index() <= other.index();
   }
   bool operator>(const Register& other) const {
     return index() > other.index();
   }
   bool operator>=(const Register& other) const {
     return index() >= other.index();
   }
 
  private:
   static const int kInvalidIndex = kMaxInt;
+  static const int kRegisterFileStartOffset =
+      InterpreterFrameConstants::kRegisterFileFromFp / kPointerSize;
 
   void* operator new(size_t size);
   void operator delete(void* p);
 
   int index_;
 };
 
 
 class Bytecodes {
  public:
@@ skipping 170 matching lines @@
 std::ostream& operator<<(std::ostream& os, const AccumulatorUse& use);
 std::ostream& operator<<(std::ostream& os, const OperandScale& operand_scale);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_