Add a new API V8::SetJitCodeEventHandler to push code name and location to users such as profilers.

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2926 matching lines @@
  *    return address resides. This can be used to identify the caller of
  *    \p function, and/or modified to divert execution when \p function exits.
  *
  * \note the entry hook must not cause garbage collection.
  */
 typedef void (*FunctionEntryHook)(uintptr_t function,
                                   uintptr_t return_addr_location);
 
 
 /**
+ * A JIT code event is issued each time code is added, moved or removed.
+ *
+ * \note removal events are not currently issued.
+ */
+struct JitCodeEvent {
+  enum EventType {
+    CODE_ADDED,
+    CODE_MOVED,
+    CODE_REMOVED
+  };
+
+  EventType type;
+  // Start of the instructions.
+  void* code_start;
+  // Size of the instructions.
+  size_t code_len;
+  union {
+    // Name of the object associated with the code. Only valid for CODE_ADDED.
+    const char* name;
+    // New location of instructions. Only valid for CODE_MOVED.
+    void* new_code_start;
+  };
+};
+
+
+/**
+ * Callback function passed to SetJitCodeEventHandler.
+ *
+ * \param event code add, move or removal event.
+ */
+typedef void (*JitCodeEventHandler)(const JitCodeEvent* event);
+
+
+/**
  * Interface for iterating though all external resources in the heap.
  */
 class V8EXPORT ExternalResourceVisitor {  // NOLINT
  public:
   virtual ~ExternalResourceVisitor() {}
   virtual void VisitExternalString(Handle<String> string) {}
 };
 
 
 /**
@@ skipping 254 matching lines @@
    *
    * \param entry_hook a function that will be invoked on entry to every
    *   V8-generated function.
    * \returns true on success on supported platforms, false on failure.
    * \note Setting a new entry hook function when one is already active will
    *   fail.
    */
   static bool SetFunctionEntryHook(FunctionEntryHook entry_hook);
 
   /**
+   * Allows the host application to provide the address of a function that is
+   * notified each time code is added, moved or removed.
+   *
+   * \param event_handler the JIT code event handler, which will be invoked
+   *     each time code is added, moved or removed.
+   */
+  static void SetJitCodeEventHandler(JitCodeEventHandler event_handler);
+
+  /**
    * Adjusts the amount of registered external memory.  Used to give
    * V8 an indication of the amount of externally allocated memory
    * that is kept alive by JavaScript objects.  V8 uses this to decide
    * when to perform global garbage collections.  Registering
    * externally allocated memory will trigger global garbage
    * collections more often than otherwise in an attempt to garbage
    * collect the JavaScript objects keeping the externally allocated
    * memory alive.
    *
    * \param change_in_bytes the change in externally allocated memory
@@ skipping 1304 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_