[modules] Basic support of exports

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index fce862b2579627425f2f17c208520df8fc2f27b0..bca5bb8afa2e10545370e0fe585eccedc62d8bc1 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -19343,5 +19343,28 @@ bool JSReceiver::HasProxyInPrototype(Isolate* isolate) {
   return false;
 }
 
+void JSModule::CreateExport(Handle<JSModule> module, Handle<String> name) {
+  Isolate* isolate = module->GetIsolate();
+  Handle<Cell> cell =
+      isolate->factory()->NewCell(isolate->factory()->undefined_value());
+  LookupIterator it(module, name);
+  JSObject::CreateDataProperty(&it, cell, Object::THROW_ON_ERROR).ToChecked();
+}
+
+void JSModule::StoreExport(Handle<JSModule> module,
+                           Handle<String> name, Handle<Object> value) {
+  LookupIterator it(module, name);
+  Handle<Cell> cell = Handle<Cell>::cast(JSObject::GetDataProperty(&it));
+  cell->set_value(*value);
+}
+
+Handle<Object> JSModule::LoadExport(Handle<JSModule> module,
+                                    Handle<String> name) {
+  Isolate* isolate = module->GetIsolate();
+  LookupIterator it(module, name);
+  Handle<Cell> cell = Handle<Cell>::cast(JSObject::GetDataProperty(&it));
+  return handle(cell->value(), isolate);
+}
+
 }  // namespace internal
 }  // namespace v8