1. Dynamic compute the main closure that needs to be run by the main isolate

runtime/vm/object.h

 // 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.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3965 matching lines @@
   // Character used to indicate a private identifier.
   static const char kPrivateIdentifierStart = '_';
 
   // Character used to separate private identifiers from
   // the library-specific key.
   static const char kPrivateKeySeparator = '@';
 
   void CheckReload(const Library& replacement,
                    IsolateReloadContext* context) const;
 
+  // Returns a closure of top level function 'name' in the exported namespace
+  // of this library. If a top level function 'name' does not exist we look
+  // for a top level getter 'name' that returns a closure.
+  RawObject* GetFunctionClosure(const String& name) const;
+
  private:
   static const int kInitialImportsCapacity = 4;
   static const int kImportsCapacityIncrement = 8;
 
   static RawLibrary* New();
 
   void set_num_imports(intptr_t value) const;
   bool HasExports() const;
   RawArray* loaded_scripts() const { return raw_ptr()->loaded_scripts_; }
   RawGrowableObjectArray* metadata() const { return raw_ptr()->metadata_; }
@@ skipping 5066 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_