[interpreter] move the dispatch table off heap.

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_
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
 // Do not include anything from src/interpreter other than
 // src/interpreter/bytecodes.h here!
@@ skipping 14 matching lines @@
 class InterpreterAssembler;
 }
 
 namespace interpreter {
 
 class Interpreter {
  public:
   explicit Interpreter(Isolate* isolate);
   virtual ~Interpreter() {}
 
-  // Creates an uninitialized interpreter handler table, where each handler
-  // points to the Illegal builtin.
-  static Handle<FixedArray> CreateUninitializedInterpreterTable(
-      Isolate* isolate);
-
-  // Initializes the interpreter.
+  // Initializes the interpreter dispatch table.
   void Initialize();
 
   // Generate bytecode for |info|.
   static bool MakeBytecode(CompilationInfo* info);
 
+  // GC support.
+  void IterateDispatchTable(ObjectVisitor* v);
+
+  Address dispatch_table_address() {
+    return reinterpret_cast<Address>(&dispatch_table_[0]);
+  }
+
  private:
 // Bytecode handler generator functions.
 #define DECLARE_BYTECODE_HANDLER_GENERATOR(Name, ...) \
   void Do##Name(compiler::InterpreterAssembler* assembler);
   BYTECODE_LIST(DECLARE_BYTECODE_HANDLER_GENERATOR)
 #undef DECLARE_BYTECODE_HANDLER_GENERATOR
 
   // Generates code to perform the binary operations via |function_id|.
   void DoBinaryOp(Runtime::FunctionId function_id,
                   compiler::InterpreterAssembler* assembler);
@@ skipping 52 matching lines @@
                 compiler::InterpreterAssembler* assembler);
 
   // Generates code to perform a lookup slot load via |function_id|.
   void DoLoadLookupSlot(Runtime::FunctionId function_id,
                         compiler::InterpreterAssembler* assembler);
 
   // Generates code to perform a lookup slot store depending on |language_mode|.
   void DoStoreLookupSlot(LanguageMode language_mode,
                          compiler::InterpreterAssembler* assembler);
 
-  bool IsInterpreterTableInitialized(Handle<FixedArray> handler_table);
+  bool IsDispatchTableInitialized();
+
+  static const int kDispatchTableSize = static_cast<int>(Bytecode::kLast) + 1;
 
   Isolate* isolate_;
+  Object* dispatch_table_[kDispatchTableSize];
 
   DISALLOW_COPY_AND_ASSIGN(Interpreter);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_H_