Extract invoke-main stub generator.

pkg/compiler/lib/src/js_emitter/program_builder.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 dart2js.js_emitter.program_builder;
 
 import 'js_emitter.dart' show computeMixinClass;
 import 'model.dart';
 
 import '../common.dart';
 import '../js/js.dart' as js;
 
 import '../js_backend/js_backend.dart' show
     Namer,
     JavaScriptBackend,
     JavaScriptConstantCompiler;
 
 import 'js_emitter.dart' show
     ClassStubGenerator,
     CodeEmitterTask,
     InterceptorStubGenerator,
+    MainCallStubGenerator,
     ParameterStubGenerator,
     TypeTestGenerator,
     TypeTestProperties;
 
 import '../universe/universe.dart' show Universe;
 import '../deferred_load.dart' show DeferredLoadTask, OutputUnit;
 
 part 'registry.dart';
 
 class ProgramBuilder {
@@ skipping 113 matching lines @@
     InterceptorStubGenerator stubGenerator =
         new InterceptorStubGenerator(_compiler, namer, backend);
     return stubGenerator.generateTypeToInterceptorMap();
   }
 
   MainFragment _buildMainOutput(LibrariesMap librariesMap) {
     // Construct the main output from the libraries and the registered holders.
     MainFragment result = new MainFragment(
         librariesMap.outputUnit,
         "",  // The empty string is the name for the main output file.
-        backend.emitter.staticFunctionAccess(_compiler.mainFunction),
+        _buildInvokeMain(),
         _buildLibraries(librariesMap),
         _buildStaticNonFinalFields(librariesMap),
         _buildStaticLazilyInitializedFields(librariesMap),
         _buildConstants(librariesMap),
         _registry.holders.toList(growable: false));
     _outputs[librariesMap.outputUnit] = result;
     return result;
   }
 
+  js.Statement _buildInvokeMain() {
+    MainCallStubGenerator generator =
+        new MainCallStubGenerator(_compiler, backend, backend.emitter);
+    return generator.generateInvokeMain();
+  }
+
   DeferredFragment _buildDeferredOutput(MainFragment mainOutput,
                                       LibrariesMap librariesMap) {
     DeferredFragment result = new DeferredFragment(
         librariesMap.outputUnit,
         backend.deferredPartFileName(librariesMap.name, addExtension: false),
                                      librariesMap.name,
         mainOutput,
         _buildLibraries(librariesMap),
         _buildStaticNonFinalFields(librariesMap),
         _buildStaticLazilyInitializedFields(librariesMap),
@@ skipping 470 matching lines @@
       _registry.registerConstant(outputUnit, constantValue);
       assert(!_constants.containsKey(constantValue));
       String name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 }