Implement automatic loading of dart:core_native_fields library

vm/class_finalizer.cc

Index: vm/class_finalizer.cc
===================================================================
--- vm/class_finalizer.cc	(revision 1520)
+++ vm/class_finalizer.cc	(working copy)
@@ -912,6 +912,16 @@
   if (cls.is_const()) {
     CheckForLegalConstClass(cls);
   }
+  // Check to ensure we don't have classes with native fields in libraries
+  // which do not have a native resolver.
+  if (cls.num_native_fields() != 0) {
+    const Library& lib = Library::Handle(cls.library());
+    if (lib.native_entry_resolver() == NULL) {
+      const String& name = String::Handle(cls.Name());
+      ReportError("class '%s' is invalid, it is extending an invalid class.\n",

[Anton Muhin, 2011/11/15 12:22:23]

very nice check, but message looks slightly misleading.  Maybe something along
'class %s with native fields, but no native resolver for lib %s'?

[siva, 2011/11/15 19:42:49]

Done.

+                  name.ToCString());
+    }
+  }
 }