[interpreter] Avoid code duplication in Interpreter::Initialize().

src/interpreter/interpreter.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_INTERPRETER_H_
 #define V8_INTERPRETER_INTERPRETER_H_
 
 #include <memory>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 58 matching lines @@
   // TODO(ignition): Tune code size multiplier.
   static const int kCodeSizeMultiplier = 32;
 
  private:
 // Bytecode handler generator functions.
 #define DECLARE_BYTECODE_HANDLER_GENERATOR(Name, ...) \
   void Do##Name(InterpreterAssembler* assembler);
   BYTECODE_LIST(DECLARE_BYTECODE_HANDLER_GENERATOR)
 #undef DECLARE_BYTECODE_HANDLER_GENERATOR
 
+  typedef void (Interpreter::*BytecodeGeneratorFunc)(InterpreterAssembler*);
+
+  // Generates handler for given |bytecode| and |operand_scale| using
+  // |generator| and installs it into the dispatch table.
+  void InstallBytecodeHandler(Zone* zone, Bytecode bytecode,
+                              OperandScale operand_scale,
+                              BytecodeGeneratorFunc generator);
+
   // Generates code to perform the binary operation via |Generator|.
   template <class Generator>
   void DoBinaryOpWithFeedback(InterpreterAssembler* assembler);
 
   // Generates code to perform the comparison via |Generator| while gathering
   // type feedback.
   void DoCompareOpWithFeedback(Token::Value compare_op,
                                InterpreterAssembler* assembler);
 
   // Generates code to perform the bitwise binary operation corresponding to
@@ skipping 87 matching lines @@
   std::unique_ptr<uintptr_t[]> bytecode_dispatch_counters_table_;
 
   DISALLOW_COPY_AND_ASSIGN(Interpreter);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_H_