VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/vm/parser.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 "vm/parser.h"
 #include "vm/flags.h"
 
 #ifndef DART_PRECOMPILED_RUNTIME
 
 #include "lib/invocation_mirror.h"
@@ skipping 12407 matching lines @@
   if (type->IsResolved()) {
     return;
   }
   // Resolve class.
   if (!type->HasResolvedTypeClass()) {
     const UnresolvedClass& unresolved_class =
         UnresolvedClass::Handle(Z, type->unresolved_class());
     const String& unresolved_class_name =
         String::Handle(Z, unresolved_class.ident());
     Class& resolved_type_class = Class::Handle(Z);
-    if (unresolved_class.library_prefix() == LibraryPrefix::null()) {
+    if (unresolved_class.library_or_library_prefix() == Object::null()) {
       // First check if the type is a function type parameter.
       if (!innermost_function().IsNull()) {
         // TODO(regis): Shortcut this lookup if no generic functions in scope.
         TypeParameter& type_parameter = TypeParameter::ZoneHandle(Z,
             innermost_function().LookupTypeParameter(unresolved_class_name,
                                                      NULL));
         if (!type_parameter.IsNull()) {
           // TODO(regis): Check for absence of type arguments.
           // For now, resolve the function type parameter to dynamic.
           *type = Type::DynamicType();
@@ skipping 31 matching lines @@
         return;
       }
       // The referenced class may not have been parsed yet. It would be wrong
       // to resolve it too early to an imported class of the same name. Only
       // resolve the class when a finalized type is requested.
       if (finalization > ClassFinalizer::kResolveTypeParameters) {
         resolved_type_class = library_.LookupClass(unresolved_class_name);
       }
     } else {
       // Resolve class name in the scope of the library prefix.
-      const LibraryPrefix& lib_prefix =
-          LibraryPrefix::Handle(Z, unresolved_class.library_prefix());
-      resolved_type_class = lib_prefix.LookupClass(unresolved_class_name);
+      const Object& prefix =
+          Object::Handle(Z, unresolved_class.library_or_library_prefix());
+      ASSERT(prefix.IsLibraryPrefix());
+      resolved_type_class =
+          LibraryPrefix::Cast(prefix).LookupClass(unresolved_class_name);
     }
     // At this point, we can only have a parameterized_type.
     const Type& parameterized_type = Type::Cast(*type);
     if (!resolved_type_class.IsNull()) {
       // Replace unresolved class with resolved type class.
       parameterized_type.set_type_class(resolved_type_class);
     } else if (finalization >= ClassFinalizer::kCanonicalize) {
       ClassFinalizer::FinalizeMalformedType(
           Error::Handle(Z),  // No previous error.
           script_,
@@ skipping 1586 matching lines @@
               call_pos,
               "redirecting factory type '%s' cannot be instantiated",
               String::Handle(Z, redirect_type.UserVisibleName()).ToCString());
         }
       }
       if (!redirect_type.HasResolvedTypeClass()) {
         // If the redirection type is unresolved, we convert the allocation
         // into throwing a type error.
         const UnresolvedClass& cls =
             UnresolvedClass::Handle(Z, redirect_type.unresolved_class());
-        const LibraryPrefix& prefix =
-            LibraryPrefix::Handle(Z, cls.library_prefix());
+        const LibraryPrefix& prefix = LibraryPrefix::Cast(
+            Object::Handle(Z, cls.library_or_library_prefix()));
         if (!prefix.IsNull() && !prefix.is_loaded() &&
             !FLAG_load_deferred_eagerly) {
           // If the redirection type is unresolved because it refers to
           // an unloaded deferred prefix, mark this function as depending
           // on the library prefix. It will then get invalidated when the
           // prefix is loaded.
           parsed_function()->AddDeferredPrefix(prefix);
         }
         redirect_type = ClassFinalizer::NewFinalizedMalformedType(
             Error::Handle(Z),
@@ skipping 1044 matching lines @@
     const ArgumentListNode& function_args,
     const LocalVariable* temp_for_last_arg,
     bool is_super_invocation) {
   UNREACHABLE();
   return NULL;
 }
 
 }  // namespace dart
 
 #endif  // DART_PRECOMPILED_RUNTIME