Implement automatic loading of dart:core_native_fields library

bin/builtin_in.cc

 // Copyright (c) 2011, 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 "include/dart_api.h"
 
 #include "bin/builtin.h"
@@ skipping 75 matching lines @@
         // Wrong number of arguments.
         // TODO(regis): Should we pass a buffer for error reporting?
         return NULL;
       }
     }
   }
   return NULL;
 }
 
 
-void Builtin_LoadLibrary() {
-  Dart_Handle url = Dart_NewString(DartUtils::kBuiltinLibURL);
-  Dart_Handle result = Dart_LookupLibrary(url);
-  if (!Dart_IsError(result)) {
-    // Builtin library already loaded.
-    return;
-  }
-
-  // Load the library.
-  Dart_Handle source = Dart_NewString(Builtin_source_);
-  Dart_Handle builtin_lib = Dart_LoadLibrary(url, source);
-  ASSERT(!Dart_IsError(builtin_lib));
-
-  // Lookup the core libraries and inject the builtin library into them.
-  Dart_Handle core_lib = Dart_LookupLibrary(Dart_NewString("dart:core"));
+static void SetupCorelibImports(Dart_Handle builtin_lib) {
+  // Lookup the core libraries and import the builtin library into them.
+  Dart_Handle url = Dart_NewString(DartUtils::kCoreLibURL);
+  Dart_Handle core_lib = Dart_LookupLibrary(url);
   ASSERT(!Dart_IsError(core_lib));
-  result = Dart_LibraryImportLibrary(core_lib, builtin_lib);
+  Dart_Handle result = Dart_LibraryImportLibrary(core_lib, builtin_lib);
   ASSERT(!Dart_IsError(result));
 
-  Dart_Handle coreimpl_lib =
-      Dart_LookupLibrary(Dart_NewString("dart:coreimpl"));
+  url = Dart_NewString(DartUtils::kCoreImplLibURL);
+  Dart_Handle coreimpl_lib = Dart_LookupLibrary(url);
   ASSERT(!Dart_IsError(coreimpl_lib));
   result = Dart_LibraryImportLibrary(coreimpl_lib, builtin_lib);
   ASSERT(!Dart_IsError(result));
   result = Dart_LibraryImportLibrary(builtin_lib, coreimpl_lib);
   ASSERT(!Dart_IsError(result));
+}
 
-  // Create a native wrapper "EventHandlerNativeWrapper" so that we can add a
-  // native field to store the event handle for implementing all
-  // event operations.
-  Dart_Handle name = Dart_NewString("EventHandlerNativeWrapper");
-  const int kNumEventHandlerFields = 1;
-  result = Dart_CreateNativeWrapperClass(builtin_lib,
-                                         name,
-                                         kNumEventHandlerFields);
-  ASSERT(!Dart_IsError(result));
+
+Dart_Handle Builtin_LoadLibrary() {
+  Dart_Handle url = Dart_NewString(DartUtils::kBuiltinLibURL);
+  Dart_Handle source = Dart_NewString(Builtin_source_);
+  Dart_Handle builtin_lib = Dart_LoadLibrary(url, source);
+  if (!Dart_IsError(builtin_lib)) {
+    // Setup core lib, builtin import structure.
+    SetupCorelibImports(builtin_lib);
+    // Setup the native resolver for built in library functions.
+    Dart_Handle result = Dart_SetNativeResolver(builtin_lib, native_lookup);
+    ASSERT(!Dart_IsError(result));
+  }
+  return builtin_lib;
 }
 
 
 void Builtin_ImportLibrary(Dart_Handle library) {
-  Builtin_LoadLibrary();
-
   Dart_Handle url = Dart_NewString(DartUtils::kBuiltinLibURL);
   Dart_Handle builtin_lib = Dart_LookupLibrary(url);
-  ASSERT(!Dart_IsError(builtin_lib));
+  if (Dart_IsError(builtin_lib)) {
+    // Load the Builtin library.
+    builtin_lib = Builtin_LoadLibrary();
+  }
+  // Import the builtin library into current library.
   Dart_Handle result = Dart_LibraryImportLibrary(library, builtin_lib);
   ASSERT(!Dart_IsError(result));
 }
 
 
 void Builtin_SetNativeResolver() {
   Dart_Handle url = Dart_NewString(DartUtils::kBuiltinLibURL);
   Dart_Handle builtin_lib = Dart_LookupLibrary(url);
   ASSERT(!Dart_IsError(builtin_lib));
+  // Setup the native resolver for built in library functions.
   Dart_Handle result = Dart_SetNativeResolver(builtin_lib, native_lookup);
   ASSERT(!Dart_IsError(result));
 }