[interpreter] Support on-stack replacement in profiler.

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 47 matching lines @@
   Local<v8::Object> GetDispatchCountersObject();
 
   Address dispatch_table_address() {
     return reinterpret_cast<Address>(&dispatch_table_[0]);
   }
 
   Address bytecode_dispatch_counters_table() {
     return reinterpret_cast<Address>(bytecode_dispatch_counters_table_.get());
   }
 
+  // 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
 
   // Generates code to perform the binary operation via |Generator|.
   template <class Generator>
   void DoBinaryOp(InterpreterAssembler* assembler);
@@ skipping 98 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_