Compute [WorldImpact] for main method as entrypoint

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 EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 665 matching lines @@
               fullyEnqueueLibrary(
                   libraryLoader.lookupLibrary(libraryUri), enqueuer.resolution);
             }
           }
         }
         // Elements required by enqueueHelpers are global dependencies
         // that are not pulled in by a particular element.
         backend.enqueueHelpers(enqueuer.resolution);
         resolveLibraryMetadata();
         reporter.log('Resolving...');
+        if (mainFunction != null && !mainFunction.isMalformed) {
+          mainFunction.computeType(resolution);
+          backend.backendClasses.listImplementation.ensureResolved(resolution);

[Harry Terkelsen, 2016/11/18 17:40:21]

don't we only need to resolve List and String if main has arguments?

[Johnni Winther, 2016/11/21 12:45:09]

Moved these into the backend.

+          backend.backendClasses.stringImplementation
+              .ensureResolved(resolution);
+        }
+
         processQueue(enqueuer.resolution, mainFunction);
         enqueuer.resolution.logSummary(reporter.log);
 
         _reporter.reportSuppressedMessagesSummary();
 
         if (compilationFailed) {
           if (!options.generateCodeWithCompileTimeErrors) return;
           if (!backend
               .enableCodegenWithErrorsIfSupported(NO_LOCATION_SPANNABLE)) {
             return;
@@ skipping 144 matching lines @@
                   enqueuer.applyImpact(
                       impactStrategy,
                       selfTask.measureSubtask(
                           "work.run", () => work.run(this, enqueuer)),
                       impactSource: work.element);
                 }));
       });
     });
   }
 
-  void processQueue(Enqueuer enqueuer, Element main) {
+  void processQueue(Enqueuer enqueuer, MethodElement mainMethod) {
     selfTask.measureSubtask("Compiler.processQueue", () {
       enqueuer.applyImpact(
           impactStrategy,
           enqueuer.nativeEnqueuer
               .processNativeClasses(libraryLoader.libraries));
-      if (main != null && !main.isMalformed) {
-        FunctionElement mainMethod = main;
-        mainMethod.computeType(resolution);
-        if (mainMethod.functionSignature.parameterCount != 0) {
-          // The first argument could be a list of strings.
-          backend.backendClasses.listImplementation.ensureResolved(resolution);
-          enqueuer.registerInstantiatedType(
-              backend.backendClasses.listImplementation.rawType);
-          backend.backendClasses.stringImplementation
-              .ensureResolved(resolution);
-          enqueuer.registerInstantiatedType(
-              backend.backendClasses.stringImplementation.rawType);
-
-          backend.registerMainHasArguments(enqueuer);
-        }
-        enqueuer.addToWorkList(main);
+      if (mainMethod != null && !mainMethod.isMalformed) {
+        enqueuer.applyImpact(
+            impactStrategy, backend.computeMainImpact(enqueuer, mainMethod));
       }
       if (options.verbose) {
         progress.reset();
       }
       emptyQueue(enqueuer);
       enqueuer.queueIsClosed = true;
       // Notify the impact strategy impacts are no longer needed for this
       // enqueuer.
       impactStrategy.onImpactUsed(enqueuer.impactUse);
       backend.onQueueClosed();
@@ skipping 1375 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;
 }