src: use an array for faster binding data lookup

Locally the hashing of the binding names sometimes has significant
presence in the profile of bindings, because there can be collisions,
which makes the cost of adding a new binding data non-trivial,
but it's wasteful to spend time on hashing them or dealing with
collisions at all, since we can just use the EmbedderObjectType
enum as the key, as the string names are not actually used beyond
debugging purposes and can be easily matched with a macro.
And since we can just use the enum as the key, we do not even
need the map and can just use an array with the enum as indices
for the lookup.

PR-URL: https://github.com/nodejs/node/pull/46620
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/node_realm.h b/src/node_realm.h
index cf37fe31bd..04129eec47 100644
--- a/src/node_realm.h
+++ b/src/node_realm.h
@@ -21,9 +21,9 @@ struct RealmSerializeInfo {
   friend std::ostream& operator<<(std::ostream& o, const RealmSerializeInfo& i);
 };
 
-using BindingDataStore = std::unordered_map<FastStringKey,
-                                            BaseObjectPtr<BaseObject>,
-                                            FastStringKey::Hash>;
+using BindingDataStore = std::array<BaseObjectPtr<BaseObject>,
+                     static_cast<size_t>(
+                         BindingDataType::kBindingDataTypeCount)>;
 
 /**
  * node::Realm is a container for a set of JavaScript objects and functions