Implement capability to use the same library prefix for multiple library imports (currently this ...

vm/class_finalizer.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 "vm/class_finalizer.h"
 
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
@@ skipping 247 matching lines @@
 
 
 // Resolve unresolved_class in the library of cls.
 RawClass* ClassFinalizer::ResolveClass(
     const Class& cls, const UnresolvedClass& unresolved_class) {
   const String& class_name = String::Handle(unresolved_class.ident());
   Library& lib = Library::Handle();
   Class& resolved_class = Class::Handle();
   if (unresolved_class.library_prefix() == LibraryPrefix::null()) {
     lib = cls.library();
+    ASSERT(!lib.IsNull());
     resolved_class = lib.LookupClass(class_name);
   } else {
     LibraryPrefix& lib_prefix = LibraryPrefix::Handle();
     lib_prefix = unresolved_class.library_prefix();
     ASSERT(!lib_prefix.IsNull());
-    lib = lib_prefix.library();
-    resolved_class = lib.LookupLocalClass(class_name);
+    resolved_class = lib_prefix.LookupLocalClass(class_name);
   }
   if (resolved_class.IsNull()) {
     const Script& script = Script::Handle(cls.script());
     ReportError(script, unresolved_class.token_index(),
                 "cannot resolve class name '%s' from '%s'.\n",
                 String::Handle(unresolved_class.Name()).ToCString(),
                 String::Handle(cls.Name()).ToCString());
   }
   return resolved_class.raw();
 }
@@ skipping 939 matching lines @@
   va_end(args);
   if (FLAG_warning_as_error) {
     Isolate::Current()->long_jump_base()->Jump(1, error);
     UNREACHABLE();
   } else {
     OS::Print("%s", error.ToErrorCString());
   }
 }
 
 }  // namespace dart