Base JavaScript code position computation on JavaScript tracer.

pkg/compiler/lib/src/io/source_information.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 dart2js.source_information;
 
 import '../common.dart';
 import '../elements/elements.dart' show
     AstElement,
     LocalElement;
 import '../tree/tree.dart' show
     Node,
     Send;
 import '../js/js.dart' show
     JavaScriptNodeSourceInformation;
 import 'source_file.dart';
 
 bool useNewSourceInfo =
     const bool.fromEnvironment('USE_NEW_SOURCE_INFO', defaultValue: false);
 
 /// Interface for passing source information, for instance for use in source
 /// maps, through the backend.
 abstract class SourceInformation extends JavaScriptNodeSourceInformation {
+  const SourceInformation();
+
   SourceSpan get sourceSpan;
 
   /// The source location associated with the start of the JS node.
   SourceLocation get startPosition => null;
 
   /// The source location associated with the closing of the JS node.
   SourceLocation get closingPosition => null;
 
   /// The source location associated with the end of the JS node.
   SourceLocation get endPosition => null;
 
   /// All source locations associated with this source information.
   List<SourceLocation> get sourceLocations;
 
   /// Return a short textual representation of the source location.
   String get shortText;
 }
 
 /// Strategy for creating, processing and applying [SourceInformation].
 class SourceInformationStrategy {
   const SourceInformationStrategy();
 
   /// Create a [SourceInformationBuilder] for [element].
   SourceInformationBuilder createBuilderForContext(AstElement element) {
     return const SourceInformationBuilder();
   }
+
+  /// Generate [SourceInformation] marker for non-preamble code.
+  SourceInformation buildSourceMappedMarker() => null;
+
+  /// Called when compilation has completed.
+  void onComplete() {}
 }
 
 /// Interface for generating [SourceInformation].
 class SourceInformationBuilder {
   const SourceInformationBuilder();
 
   /// Create a [SourceInformationBuilder] for [element].
   SourceInformationBuilder forContext(AstElement element) => this;
 
   /// Generate [SourceInformation] the declaration of [element].
@@ skipping 130 matching lines @@
     return '${computeElementNameForSourceMaps(local.executableContext)}.$name';
   } else if (element.enclosingClass != null) {
     if (element.enclosingClass.isClosure) {
       return computeElementNameForSourceMaps(element.enclosingClass);
     }
     return '${element.enclosingClass.name}.${element.name}';
   } else {
     return element.name;
   }
 }