Logger: extract low level logging code into a separate class.

src/log-utils.h

 // Copyright 2006-2009 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 21 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 class Logger;
 
 // Functions and data for performing output of log messages.
 class Log {
  public:
   // Performs process-wide initialization.
-  void Initialize();
+  void Initialize(const char* log_file_name);
 
   // Disables logging, but preserves acquired resources.
   void stop() { is_stopped_ = true; }
 
   static bool InitLogAtStart() {
     return FLAG_log || FLAG_log_runtime || FLAG_log_api
         || FLAG_log_code || FLAG_log_gc || FLAG_log_handles || FLAG_log_suspect
         || FLAG_log_regexp || FLAG_ll_prof || FLAG_log_internal_timer_events;
   }
 
   // Frees all resources acquired in Initialize and Open... functions.
   // When a temporary file is used for the log, returns its stream descriptor,
   // leaving the file open.
   FILE* Close();
 
   // Returns whether logging is enabled.
   bool IsEnabled() {
     return !is_stopped_ && output_handle_ != NULL;
   }
 
   // Size of buffer used for formatting log messages.
   static const int kMessageBufferSize = 2048;
 
   // This mode is only used in tests, as temporary files are automatically
   // deleted on close and thus can't be accessed afterwards.
   static const char* const kLogToTemporaryFile;
+  static const char* const kLogToConsole;
 
  private:
   explicit Log(Logger* logger);
 
   // Opens stdout for logging.
   void OpenStdout();
 
   // Opens file for logging.
   void OpenFile(const char* name);
 
@@ skipping 10 matching lines @@
     return length;
   }
 
   // Whether logging is stopped (e.g. due to insufficient resources).
   bool is_stopped_;
 
   // When logging is active output_handle_ is used to store a pointer to log
   // destination.  mutex_ should be acquired before using output_handle_.
   FILE* output_handle_;
 
-  // Used when low-level profiling is active.
-  FILE* ll_output_handle_;
-
   // mutex_ is a Mutex used for enforcing exclusive
   // access to the formatting buffer and the log file or log memory buffer.
   Mutex* mutex_;
 
   // Buffer used for formatting log messages. This is a singleton buffer and
   // mutex_ should be acquired before using it.
   char* message_buffer_;
 
   Logger* logger_;
 
@@ skipping 39 matching lines @@
 
  private:
   Log* log_;
   ScopedLock sl;
   int pos_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_UTILS_H_