[modules] Basic support of import statements.

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 19590 matching lines @@
   cell->set_value(*value);
 }
 
 Handle<Object> Module::LoadExport(Handle<Module> module, Handle<String> name) {
   Isolate* isolate = module->GetIsolate();
   Handle<ObjectHashTable> exports(module->exports(), isolate);
   Handle<Cell> cell(Cell::cast(exports->Lookup(name)));
   return handle(cell->value(), isolate);
 }
 
+Handle<Object> Module::LoadImport(Handle<Module> module, Handle<String> name,
+                                  int module_request) {
+  Isolate* isolate = module->GetIsolate();
+  Handle<Module> requested_module(
+      Module::cast(module->requested_modules()->get(module_request)), isolate);
+  Handle<ObjectHashTable> exports(requested_module->exports(), isolate);
+  Object* object = exports->Lookup(name);
+  if (!object->IsCell()) UNIMPLEMENTED();
+  return handle(Cell::cast(object)->value(), isolate);
+}
+
 }  // namespace internal
 }  // namespace v8