Add BackendStrategy

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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.compiler_base;
 
 import 'dart:async' show Future;
 
 import '../compiler_new.dart' as api;
+import 'backend_strategy.dart';
 import 'closure.dart' as closureMapping show ClosureTask;
 import 'common/names.dart' show Selectors;
 import 'common/names.dart' show Uris;
 import 'common/resolution.dart'
     show
         ParsingContext,
         Resolution,
         ResolutionWorkItem,
         ResolutionImpact,
         Target;
@@ skipping 45 matching lines @@
 import 'tree/tree.dart' show Node, TypeAnnotation;
 import 'typechecker.dart' show TypeCheckerTask;
 import 'types/types.dart' show GlobalTypeInferenceTask;
 import 'universe/selector.dart' show Selector;
 import 'universe/world_builder.dart'
     show ResolutionWorldBuilder, CodegenWorldBuilder;
 import 'universe/use.dart' show StaticUse, TypeUse;
 import 'universe/world_impact.dart'
     show ImpactStrategy, WorldImpact, WorldImpactBuilderImpl;
 import 'util/util.dart' show Link;
-import 'world.dart' show ClosedWorld, ClosedWorldRefiner, ClosedWorldImpl;
+import 'world.dart' show ClosedWorld, ClosedWorldRefiner;
 
 typedef CompilerDiagnosticReporter MakeReporterFunction(
     Compiler compiler, CompilerOptions options);
 
 abstract class Compiler {
   Measurer get measurer;
 
   final IdGenerator idGenerator = new IdGenerator();
   DartTypes types;
   FrontEndStrategy frontEndStrategy;
+  BackendStrategy backendStrategy;
   CommonElements _commonElements;
   ElementEnvironment _elementEnvironment;
   CompilerDiagnosticReporter _reporter;
   CompilerResolution _resolution;
   ParsingContext _parsingContext;
 
   ImpactStrategy impactStrategy = const ImpactStrategy();
 
   /**
    * Map from token to the first preceding comment token.
@@ skipping 90 matching lines @@
             ? const NullCompilerOutput()
             : outputProvider {
     if (makeReporter != null) {
       _reporter = makeReporter(this, options);
     } else {
       _reporter = new CompilerDiagnosticReporter(this, options);
     }
     frontEndStrategy = options.loadFromDill
         ? new KernelFrontEndStrategy(reporter)
         : new ResolutionFrontEndStrategy(this);
+    backendStrategy = options.loadFromDill
+        ? new KernelBackendStrategy()
+        : new ElementBackendStrategy(this);
     _resolution = createResolution();
     _elementEnvironment = frontEndStrategy.elementEnvironment;
     _commonElements = new CommonElements(_elementEnvironment);
     types = new Types(_resolution);
 
     if (options.verbose) {
       progress = new Stopwatch()..start();
     }
 
     backend = createBackend();
@@ skipping 413 matching lines @@
 
         backend.onCodegenEnd();
 
         checkQueues(resolutionEnqueuer, codegenEnqueuer);
       });
 
   /// Perform the steps needed to fully end the resolution phase.
   ClosedWorldRefiner closeResolution() {
     phase = PHASE_DONE_RESOLVING;
 
-    ClosedWorldImpl world = resolutionWorldBuilder.closeWorld();
+    ClosedWorld closedWorld = resolutionWorldBuilder.closeWorld();
+    ClosedWorldRefiner closedWorldRefiner =
+        backendStrategy.createClosedWorldRefiner(closedWorld);
     // Compute whole-program-knowledge that the backend needs. (This might
     // require the information computed in [world.closeWorld].)
-    backend.onResolutionClosedWorld(world, world);
+    backend.onResolutionClosedWorld(closedWorld, closedWorldRefiner);
 
     deferredLoadTask.onResolutionComplete(mainFunction);
 
     // TODO(johnniwinther): Move this after rti computation but before
     // reflection members computation, and (re-)close the world afterwards.
-    closureToClassMapper.createClosureClasses(world);
-    return world;
+    backendStrategy.convertClosures(closedWorldRefiner);
+    return closedWorldRefiner;
   }
 
   /// Compute the [WorldImpact] for accessing all elements in [library].
   WorldImpact computeImpactForLibrary(LibraryElement library) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
 
     void registerStaticUse(Element element) {
       impactBuilder.registerStaticUse(new StaticUse.directUse(element));
     }
 
@@ skipping 1026 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }