Conditional AST timing.

pkg/analyzer/lib/src/task/dart.dart

 // Copyright (c) 2015, 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 analyzer.src.task.dart;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 2797 matching lines @@
     //
     // Prepare inputs.
     //
     CompilationUnit unit = getRequiredInput(RESOLVED_UNIT_INPUT);
 
     //
     // Generate lints.
     //
     List<AstVisitor> visitors = <AstVisitor>[];
 
+    bool timeVisits = analysisOptions.enableTiming;
     List<Linter> linters = getLints(context);
     for (Linter linter in linters) {
       AstVisitor visitor = linter.getVisitor();
       if (visitor != null) {
         linter.reporter = errorReporter;
-        visitors
-            .add(new TimedAstVisitor(visitor, lintRegistry.getTimer(linter)));
+        if (timeVisits) {
+          visitor = new TimedAstVisitor(visitor, lintRegistry.getTimer(linter));
+        }
+        visitors.add(visitor);
       }
     }
 
     DelegatingAstVisitor dv = new DelegatingAstVisitor(visitors);
     unit.accept(dv);
 
     //
     // Record outputs.
     //
     outputs[LINTS] = errorListener.errors;
@@ skipping 2512 matching lines @@
 
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.removeLast();
     return true;
   }
 }