[Interpreter] Log source positions for bytecode arrays.

src/log.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_LOG_H_
 #define V8_LOG_H_
 
 #include <string>
 
 #include "src/allocation.h"
@@ skipping 423 matching lines @@
   }
 
   ~TimerEventScope() { LogTimerEvent(Logger::END); }
 
   void LogTimerEvent(Logger::StartEnd se);
 
  private:
   Isolate* isolate_;
 };
 
+class PositionsRecorder BASE_EMBEDDED {
+ public:
+  PositionsRecorder() { jit_handler_data_ = NULL; }
+
+  void AttachJITHandlerData(void* user_data) { jit_handler_data_ = user_data; }
+
+  void* DetachJITHandlerData() {
+    void* old_data = jit_handler_data_;
+    jit_handler_data_ = NULL;
+    return old_data;
+  }
+
+ protected:
+  // Currently jit_handler_data_ is used to store JITHandler-specific data
+  // over the lifetime of a PositionsRecorder
+  void* jit_handler_data_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PositionsRecorder);
+};
 
 class CodeEventListener {
  public:
   virtual ~CodeEventListener() {}
 
   virtual void CodeCreateEvent(Logger::LogEventsAndTags tag, AbstractCode* code,
                                const char* comment) = 0;
   virtual void CodeCreateEvent(Logger::LogEventsAndTags tag, AbstractCode* code,
                                Name* name) = 0;
   virtual void CodeCreateEvent(Logger::LogEventsAndTags tag, AbstractCode* code,
@@ skipping 50 matching lines @@
 
   NameBuffer* name_buffer_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 
 #endif  // V8_LOG_H_