- Use a map to lookup libraries by URL.

runtime/vm/object_store.cc

 // Copyright (c) 2013, 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/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 55 matching lines @@
     internal_library_(Library::null()),
     isolate_library_(Library::null()),
     math_library_(Library::null()),
     mirrors_library_(Library::null()),
     native_wrappers_library_(Library::null()),
     profiler_library_(Library::null()),
     root_library_(Library::null()),
     typed_data_library_(Library::null()),
     vmservice_library_(Library::null()),
     libraries_(GrowableObjectArray::null()),
+    libraries_map_(Array::null()),
     closure_functions_(GrowableObjectArray::null()),
     pending_classes_(GrowableObjectArray::null()),
     pending_deferred_loads_(GrowableObjectArray::null()),
     resume_capabilities_(GrowableObjectArray::null()),
     exit_listeners_(GrowableObjectArray::null()),
     error_listeners_(GrowableObjectArray::null()),
     empty_context_(Context::null()),
     stack_overflow_(Instance::null()),
     out_of_memory_(Instance::null()),
     preallocated_unhandled_exception_(UnhandledException::null()),
@@ skipping 114 matching lines @@
   cls = async_lib.LookupClass(Symbols::StreamIterator());
   ASSERT(!cls.IsNull());
   set_stream_iterator_class(cls);
 
   const Library& internal_lib = Library::Handle(internal_library());
   cls = internal_lib.LookupClass(Symbols::Symbol());
   set_symbol_class(cls);
 }
 
 }  // namespace dart