Report incremental/full analysis performance via instrumentation.

pkg/analyzer/lib/instrumentation/instrumentation.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library instrumentation;
 
 /**
+ * A container with analysis performance constants.
+ */
+class AnalysisPerformanceKind {
+  static const String FULL = 'analysis_full';
+  static const String INCREMENTAL = 'analysis_incremental';
+}
+
+/**
  * The interface used by client code to communicate with an instrumentation
  * server.
  */
 abstract class InstrumentationServer {
   /**
    * Pass the given [message] to the instrumentation server so that it will be
    * logged with other messages.
    *
    * This method should be used for most logging.
    */
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   /**
    * An instrumentation service that will not log any instrumentation data.
    */
   static final InstrumentationService NULL_SERVICE =
       new InstrumentationService(null);
 
   static const String TAG_ERROR = 'Err';
   static const String TAG_EXCEPTION = 'Ex';
   static const String TAG_LOG_ENTRY = 'Log';
   static const String TAG_NOTIFICATION = 'Noti';
+  static const String TAG_PERFORMANCE = 'Perf';
   static const String TAG_REQUEST = 'Req';
   static const String TAG_RESPONSE = 'Res';
   static const String TAG_VERSION = 'Ver';
 
   /**
    * The instrumentation server used to communicate with the server, or `null`
    * if instrumentation data should not be logged.
    */
   InstrumentationServer _instrumentationServer;
 
@@ skipping 39 matching lines @@
   }
 
   /**
    * Log that a notification has been sent to the client.
    */
   void logNotification(String notification) {
     _log(TAG_NOTIFICATION, notification);
   }
 
   /**
+   * Log the given performance fact.
+   */
+  void logPerformance(String kind, Stopwatch sw, String message) {
+    sw.stop();
+    String elapsed = sw.elapsedMilliseconds.toString();
+    if (_instrumentationServer != null) {
+      _instrumentationServer.log(
+          _join([TAG_PERFORMANCE, kind, elapsed, message]));
+    }
+  }
+
+  /**
    * Log that the given priority [exception] was thrown, with the given
    * [stackTrace].
    */
   void logPriorityException(dynamic exception, StackTrace stackTrace) {
     if (_instrumentationServer != null) {
       String message = _toString(exception);
       String trace = _toString(stackTrace);
       _instrumentationServer.logWithPriority(
           _join([TAG_EXCEPTION, message, trace]));
     }
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     }
   }
 
   @override
   void shutdown() {
     for (InstrumentationServer server in _servers) {
       server.shutdown();
     }
   }
 }