Access BackendUsage through ClosedWorld

pkg/compiler/lib/src/deferred_load.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 deferred_load;
 
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'constants/expressions.dart' show ConstantExpression;
@@ skipping 16 matching lines @@
         ImportElement,
         LibraryElement,
         MemberElement,
         MethodElement,
         MetadataAnnotation,
         PrefixElement,
         ResolvedAstKind,
         TypedefElement;
 import 'elements/entities.dart';
 import 'js_backend/js_backend.dart' show JavaScriptBackend;
-import 'js_backend/backend_usage.dart' show BackendUsage;
 import 'resolution/resolution.dart' show AnalyzableElementX;
 import 'resolution/tree_elements.dart' show TreeElements;
 import 'tree/tree.dart' as ast;
 import 'universe/use.dart' show StaticUse, StaticUseKind, TypeUse, TypeUseKind;
 import 'universe/world_impact.dart'
     show ImpactUseCase, WorldImpact, WorldImpactVisitorImpl;
 import 'util/setlet.dart' show Setlet;
 import 'util/uri_extras.dart' as uri_extras;
 import 'util/util.dart' show makeUnique;
+import 'world.dart' show ClosedWorld;
 
 /// A "hunk" of the program that will be loaded whenever one of its [imports]
 /// are loaded.
 ///
 /// Elements that are only used in one deferred import, is in an OutputUnit with
 /// the deferred import as single element in the [imports] set.
 ///
 /// Whenever a deferred Element is shared between several deferred imports it is
 /// in an output unit with those imports in the [imports] Set.
 ///
@@ skipping 98 matching lines @@
 
   final Compiler compiler;
   DeferredLoadTask(Compiler compiler)
       : compiler = compiler,
         super(compiler.measurer) {
     mainOutputUnit.imports.add(_fakeMainImport);
   }
 
   JavaScriptBackend get backend => compiler.backend;
   DiagnosticReporter get reporter => compiler.reporter;
-  BackendUsage get _backendUsage => backend.backendUsage;
 
   /// Returns the [OutputUnit] where [element] belongs.
   OutputUnit outputUnitForElement(Element element) {
     if (!isProgramSplit) return mainOutputUnit;
 
     element = element.implementation;
     while (!_elementToOutputUnit.containsKey(element)) {
       // TODO(21051): workaround: it looks like we output annotation constants
       // for classes that we don't include in the output. This seems to happen
       // when we have reflection but can see that some classes are not needed.
@@ skipping 493 matching lines @@
       hunksToLoad[importDeferName[import]] = new List<OutputUnit>();
       for (OutputUnit outputUnit in sortedOutputUnits) {
         if (outputUnit == mainOutputUnit) continue;
         if (outputUnit.imports.contains(import)) {
           hunksToLoad[importDeferName[import]].add(outputUnit);
         }
       }
     }
   }
 
-  void onResolutionComplete(FunctionEntity main) {
+  void onResolutionComplete(FunctionEntity main, ClosedWorld closedWorld) {
     if (!isProgramSplit) {
       allOutputUnits.add(mainOutputUnit);
       return;
     }
     if (main == null) return;
     MethodElement mainMethod = main;
     LibraryElement mainLibrary = mainMethod.library;
     _importedDeferredBy = new Map<_DeferredImport, Set<Element>>();
     _constantsDeferredBy = new Map<_DeferredImport, Set<ConstantValue>>();
     _importedDeferredBy[_fakeMainImport] = _mainElements;
 
     reporter.withCurrentElement(
         mainLibrary,
         () => measure(() {
               // Starting from main, traverse the program and find all
               // dependencies.
               _mapDependencies(element: mainMethod, import: _fakeMainImport);
 
               // Also add "global" dependencies to the main OutputUnit.  These
               // are things that the backend needs but cannot associate with a
               // particular element, for example, startRootIsolate.  This set
               // also contains elements for which we lack precise information.
               for (MethodElement element
-                  in _backendUsage.globalFunctionDependencies) {
+                  in closedWorld.backendUsage.globalFunctionDependencies) {
                 _mapDependencies(
                     element: element.implementation, import: _fakeMainImport);
               }
               for (ClassElement element
-                  in _backendUsage.globalClassDependencies) {
+                  in closedWorld.backendUsage.globalClassDependencies) {
                 _mapDependencies(
                     element: element.implementation, import: _fakeMainImport);
               }
 
               // Now check to see if we have to add more elements due to
               // mirrors.
               if (compiler.commonElements.mirrorsLibrary != null) {
                 _addMirrorElements();
               }
 
@@ skipping 372 matching lines @@
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 
   String toString() => '$declaration';
 }