Introduce internal Log class that handles writing log messages, enable logging to memory buffer.

include/v8.h

 // Copyright 2007-2008 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
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   /**
    * Turns on access check on the object if the object is an instance of
    * a template that has access check callbacks. If an object has no
    * access check info, the object cannot be accessed by anyone.
    */
   void TurnOnAccessCheck();
 
   /**
    * Returns the identity hash for this object. The current implemenation uses
-   * a hidden property on the object to store the identity hash. 
+   * a hidden property on the object to store the identity hash.
    *
-   * The return value will never be 0. Also, it is not guaranteed to be 
+   * The return value will never be 0. Also, it is not guaranteed to be
    * unique.
    */
   int GetIdentityHash();
 
   /**
    * Access hidden properties on JavaScript objects. These properties are
    * hidden from the executing JavaScript and only accessible through the V8
    * C++ API. Hidden properties introduced by V8 internally (for example the
    * identity hash) are prefixed with "v8::".
    */
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    */
   static void PauseProfiler();
 
   /**
    * Resumes recording of tick samples in the profiler.
    * See also PauseProfiler().
    */
   static void ResumeProfiler();
 
   /**
+   * If logging is performed into a memory buffer (via --logfile=*), allows to
+   * retrieve previously written messages. This can be used for retrieving
+   * profiler log data in application. This function is thread-safe.

[Søren Thygesen Gjesse, 2009/05/05 13:52:35]

Missing the after in.

[Mikhail Naganov, 2009/05/05 15:56:46]

Done.

+   *
+   * Caller provides a destination buffer that must exist during GetLogLines
+   * call. Only whole log lines are copied into the buffer.
+   *
+   * \param from_pos specified a point in a buffer to read from, 0 is the
+   *   beginning of a buffer. It is assumed that caller updates its current
+   *   position using returned size value from the previous call.
+   * \param dest_buf destination buffer for log data.
+   * \param max_size size of the destination buffer.
+   * \returns actual size of log data copied into buffer.
+   */
+  static int GetLogLines(int from_pos, char* dest_buf, int max_size);
+
+
+  /**
    * Releases any resources used by v8 and stops any utility threads
    * that may be running.  Note that disposing v8 is permanent, it
    * cannot be reinitialized.
    *
    * It should generally not be necessary to dispose v8 before exiting
    * a process, this should happen automatically.  It is only necessary
    * to use if the process needs the resources taken up by v8.
    */
   static bool Dispose();
 
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 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef V8EXPORT_INLINE
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_