First step towards asynchronous loading of sources

runtime/bin/main.cc

 // 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.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 526 matching lines @@
   CHECK_RESULT(builtin_lib);
 
   // Prepare for script loading by setting up the 'print' and 'timer'
   // closures and setting up 'package root' for URI resolution.
   result = DartUtils::PrepareForScriptLoading(package_root, builtin_lib);
   CHECK_RESULT(result);
 
   IsolateData* isolate_data = reinterpret_cast<IsolateData*>(data);
   ASSERT(isolate_data != NULL);
   ASSERT(isolate_data->script_url != NULL);
-  Dart_Handle library = DartUtils::LoadScript(isolate_data->script_url,
-                                              builtin_lib);
-  CHECK_RESULT(library);
-  if (!Dart_IsLibrary(library)) {
-    char errbuf[256];
-    snprintf(errbuf, sizeof(errbuf),
-             "Expected a library when loading script: %s",
-             script_uri);
-    *error = strdup(errbuf);
-    Dart_ExitScope();
-    Dart_ShutdownIsolate();
-    return NULL;
-  }
+  result = DartUtils::LoadScript(isolate_data->script_url, builtin_lib);
+  CHECK_RESULT(result);
 
+  result = Dart_RunLoop();
+  CHECK_RESULT(result);
 
   Platform::SetPackageRoot(package_root);
   Dart_Handle io_lib_url = DartUtils::NewString(DartUtils::kIOLibURL);
   CHECK_RESULT(io_lib_url);
   Dart_Handle io_lib = Dart_LookupLibrary(io_lib_url);
   CHECK_RESULT(io_lib);
   Dart_Handle platform_type = DartUtils::GetDartType(DartUtils::kIOLibURL,
                                                      "Platform");
   CHECK_RESULT(platform_type);
   Dart_Handle script_name = DartUtils::NewString("_nativeScript");
@@ skipping 565 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }