diff --git a/src/code-events.h b/src/code-events.h
new file mode 100644
index 0000000..9ae1cae
--- /dev/null
+++ b/src/code-events.h
@@ -0,0 +1,183 @@
+// Copyright 2016 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_CODE_EVENTS_H_
+#define V8_CODE_EVENTS_H_
+
+#include <unordered_set>
+
+#include "src/globals.h"
+
+namespace v8 {
+namespace internal {
+
+class AbstractCode;
+class Name;
+class SharedFunctionInfo;
+class String;
+
+#define LOG_EVENTS_AND_TAGS_LIST(V)                                      \
+  V(CODE_CREATION_EVENT, "code-creation")                                \
+  V(CODE_DISABLE_OPT_EVENT, "code-disable-optimization")                 \
+  V(CODE_MOVE_EVENT, "code-move")                                        \
+  V(CODE_DELETE_EVENT, "code-delete")                                    \
+  V(CODE_MOVING_GC, "code-moving-gc")                                    \
+  V(SHARED_FUNC_MOVE_EVENT, "sfi-move")                                  \
+  V(SNAPSHOT_CODE_NAME_EVENT, "snapshot-code-name")                      \
+  V(TICK_EVENT, "tick")                                                  \
+  V(REPEAT_META_EVENT, "repeat")                                         \
+  V(BUILTIN_TAG, "Builtin")                                              \
+  V(CALL_DEBUG_BREAK_TAG, "CallDebugBreak")                              \
+  V(CALL_DEBUG_PREPARE_STEP_IN_TAG, "CallDebugPrepareStepIn")            \
+  V(CALL_INITIALIZE_TAG, "CallInitialize")                               \
+  V(CALL_MEGAMORPHIC_TAG, "CallMegamorphic")                             \
+  V(CALL_MISS_TAG, "CallMiss")                                           \
+  V(CALL_NORMAL_TAG, "CallNormal")                                       \
+  V(LOAD_INITIALIZE_TAG, "LoadInitialize")                               \
+  V(LOAD_MEGAMORPHIC_TAG, "LoadMegamorphic")                             \
+  V(STORE_INITIALIZE_TAG, "StoreInitialize")                             \
+  V(STORE_GENERIC_TAG, "StoreGeneric")                                   \
+  V(STORE_MEGAMORPHIC_TAG, "StoreMegamorphic")                           \
+  V(KEYED_CALL_DEBUG_BREAK_TAG, "KeyedCallDebugBreak")                   \
+  V(KEYED_CALL_DEBUG_PREPARE_STEP_IN_TAG, "KeyedCallDebugPrepareStepIn") \
+  V(KEYED_CALL_INITIALIZE_TAG, "KeyedCallInitialize")                    \
+  V(KEYED_CALL_MEGAMORPHIC_TAG, "KeyedCallMegamorphic")                  \
+  V(KEYED_CALL_MISS_TAG, "KeyedCallMiss")                                \
+  V(KEYED_CALL_NORMAL_TAG, "KeyedCallNormal")                            \
+  V(CALLBACK_TAG, "Callback")                                            \
+  V(EVAL_TAG, "Eval")                                                    \
+  V(FUNCTION_TAG, "Function")                                            \
+  V(HANDLER_TAG, "Handler")                                              \
+  V(BYTECODE_HANDLER_TAG, "BytecodeHandler")                             \
+  V(KEYED_LOAD_IC_TAG, "KeyedLoadIC")                                    \
+  V(KEYED_LOAD_POLYMORPHIC_IC_TAG, "KeyedLoadPolymorphicIC")             \
+  V(KEYED_EXTERNAL_ARRAY_LOAD_IC_TAG, "KeyedExternalArrayLoadIC")        \
+  V(KEYED_STORE_IC_TAG, "KeyedStoreIC")                                  \
+  V(KEYED_STORE_POLYMORPHIC_IC_TAG, "KeyedStorePolymorphicIC")           \
+  V(KEYED_EXTERNAL_ARRAY_STORE_IC_TAG, "KeyedExternalArrayStoreIC")      \
+  V(LAZY_COMPILE_TAG, "LazyCompile")                                     \
+  V(CALL_IC_TAG, "CallIC")                                               \
+  V(LOAD_IC_TAG, "LoadIC")                                               \
+  V(LOAD_GLOBAL_IC_TAG, "LoadGlobalIC")                                  \
+  V(LOAD_POLYMORPHIC_IC_TAG, "LoadPolymorphicIC")                        \
+  V(REG_EXP_TAG, "RegExp")                                               \
+  V(SCRIPT_TAG, "Script")                                                \
+  V(STORE_IC_TAG, "StoreIC")                                             \
+  V(STORE_POLYMORPHIC_IC_TAG, "StorePolymorphicIC")                      \
+  V(STUB_TAG, "Stub")                                                    \
+  V(NATIVE_FUNCTION_TAG, "Function")                                     \
+  V(NATIVE_LAZY_COMPILE_TAG, "LazyCompile")                              \
+  V(NATIVE_SCRIPT_TAG, "Script")
+// Note that 'NATIVE_' cases for functions and scripts are mapped onto
+// original tags when writing to the log.
+
+#define PROFILE(the_isolate, Call) (the_isolate)->code_event_dispatcher()->Call;
+
+class CodeEventListener {
+ public:
+#define DECLARE_ENUM(enum_item, _) enum_item,
+  enum LogEventsAndTags {
+    LOG_EVENTS_AND_TAGS_LIST(DECLARE_ENUM) NUMBER_OF_LOG_EVENTS
+  };
+#undef DECLARE_ENUM
+
+  virtual ~CodeEventListener() {}
+
+  virtual void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                               const char* comment) = 0;
+  virtual void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                               Name* name) = 0;
+  virtual void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                               SharedFunctionInfo* shared, Name* name) = 0;
+  virtual void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                               SharedFunctionInfo* shared, Name* source,
+                               int line, int column) = 0;
+  virtual void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                               int args_count) = 0;
+  virtual void CallbackEvent(Name* name, Address entry_point) = 0;
+  virtual void GetterCallbackEvent(Name* name, Address entry_point) = 0;
+  virtual void SetterCallbackEvent(Name* name, Address entry_point) = 0;
+  virtual void RegExpCodeCreateEvent(AbstractCode* code, String* source) = 0;
+  virtual void CodeMoveEvent(AbstractCode* from, Address to) = 0;
+  virtual void SharedFunctionInfoMoveEvent(Address from, Address to) = 0;
+  virtual void CodeMovingGCEvent() = 0;
+  virtual void CodeDisableOptEvent(AbstractCode* code,
+                                   SharedFunctionInfo* shared) = 0;
+  virtual void CodeDeoptEvent(Code* code, Address pc, int fp_to_sp_delta) = 0;
+};
+
+class CodeEventDispatcher {
+ public:
+  using LogEventsAndTags = CodeEventListener::LogEventsAndTags;
+
+  CodeEventDispatcher() {}
+
+  bool AddListener(CodeEventListener* listener) {
+    return listeners_.insert(listener).second;
+  }
+  void RemoveListener(CodeEventListener* listener) {
+    listeners_.erase(listener);
+  }
+
+#define CODE_EVENT_DISPATCH(code) \
+  for (auto it = listeners_.begin(); it != listeners_.end(); ++it) (*it)->code
+
+  void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                       const char* comment) {
+    CODE_EVENT_DISPATCH(CodeCreateEvent(tag, code, comment));
+  }
+  void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code, Name* name) {
+    CODE_EVENT_DISPATCH(CodeCreateEvent(tag, code, name));
+  }
+  void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                       SharedFunctionInfo* shared, Name* name) {
+    CODE_EVENT_DISPATCH(CodeCreateEvent(tag, code, shared, name));
+  }
+  void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                       SharedFunctionInfo* shared, Name* source, int line,
+                       int column) {
+    CODE_EVENT_DISPATCH(
+        CodeCreateEvent(tag, code, shared, source, line, column));
+  }
+  void CodeCreateEvent(LogEventsAndTags tag, AbstractCode* code,
+                       int args_count) {
+    CODE_EVENT_DISPATCH(CodeCreateEvent(tag, code, args_count));
+  }
+  void CallbackEvent(Name* name, Address entry_point) {
+    CODE_EVENT_DISPATCH(CallbackEvent(name, entry_point));
+  }
+  void GetterCallbackEvent(Name* name, Address entry_point) {
+    CODE_EVENT_DISPATCH(GetterCallbackEvent(name, entry_point));
+  }
+  void SetterCallbackEvent(Name* name, Address entry_point) {
+    CODE_EVENT_DISPATCH(SetterCallbackEvent(name, entry_point));
+  }
+  void RegExpCodeCreateEvent(AbstractCode* code, String* source) {
+    CODE_EVENT_DISPATCH(RegExpCodeCreateEvent(code, source));
+  }
+  void CodeMoveEvent(AbstractCode* from, Address to) {
+    CODE_EVENT_DISPATCH(CodeMoveEvent(from, to));
+  }
+  void SharedFunctionInfoMoveEvent(Address from, Address to) {
+    CODE_EVENT_DISPATCH(SharedFunctionInfoMoveEvent(from, to));
+  }
+  void CodeMovingGCEvent() { CODE_EVENT_DISPATCH(CodeMovingGCEvent()); }
+  void CodeDisableOptEvent(AbstractCode* code, SharedFunctionInfo* shared) {
+    CODE_EVENT_DISPATCH(CodeDisableOptEvent(code, shared));
+  }
+  void CodeDeoptEvent(Code* code, Address pc, int fp_to_sp_delta) {
+    CODE_EVENT_DISPATCH(CodeDeoptEvent(code, pc, fp_to_sp_delta));
+  }
+#undef CODE_EVENT_DISPATCH
+
+ private:
+  std::unordered_set<CodeEventListener*> listeners_;
+
+  DISALLOW_COPY_AND_ASSIGN(CodeEventDispatcher);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CODE_EVENTS_H_