src: add per-realm GetBindingData() method

This version avoids the additional access to the embedder slot
when we already have a reference to the realm.

PR-URL: #49007
Refs: #48836
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

src/node_file.cc

@@ -265,17 +265,17 @@ FileHandle* FileHandle::New(BindingData* binding_data,
 }
 
 void FileHandle::New(const FunctionCallbackInfo<Value>& args) {
-  BindingData* binding_data = Realm::GetBindingData<BindingData>(args);
-  Environment* env = binding_data->env();
   CHECK(args.IsConstructCall());
   CHECK(args[0]->IsInt32());
+  Realm* realm = Realm::GetCurrent(args);
+  BindingData* binding_data = realm->GetBindingData<BindingData>();
 
   std::optional<int64_t> maybeOffset = std::nullopt;
   std::optional<int64_t> maybeLength = std::nullopt;
   if (args[1]->IsNumber())
-    maybeOffset = args[1]->IntegerValue(env->context()).FromJust();
+    maybeOffset = args[1]->IntegerValue(realm->context()).FromJust();
   if (args[2]->IsNumber())
-    maybeLength = args[2]->IntegerValue(env->context()).FromJust();
+    maybeLength = args[2]->IntegerValue(realm->context()).FromJust();
 
   FileHandle::New(binding_data,
                   args[0].As<Int32>()->Value(),
@@ -1143,13 +1143,14 @@ static void InternalModuleStat(const FunctionCallbackInfo<Value>& args) {
 }
 
 static void Stat(const FunctionCallbackInfo<Value>& args) {
-  BindingData* binding_data = Realm::GetBindingData<BindingData>(args);
-  Environment* env = binding_data->env();
+  Realm* realm = Realm::GetCurrent(args);
+  BindingData* binding_data = realm->GetBindingData<BindingData>();
+  Environment* env = realm->env();
 
   const int argc = args.Length();
   CHECK_GE(argc, 2);
 
-  BufferValue path(env->isolate(), args[0]);
+  BufferValue path(realm->isolate(), args[0]);
   CHECK_NOT_NULL(*path);
   THROW_IF_INSUFFICIENT_PERMISSIONS(
       env, permission::PermissionScope::kFileSystemRead, path.ToStringView());
@@ -1178,13 +1179,14 @@ static void Stat(const FunctionCallbackInfo<Value>& args) {
 }
 
 static void LStat(const FunctionCallbackInfo<Value>& args) {
-  BindingData* binding_data = Realm::GetBindingData<BindingData>(args);
-  Environment* env = binding_data->env();
+  Realm* realm = Realm::GetCurrent(args);
+  BindingData* binding_data = realm->GetBindingData<BindingData>();
+  Environment* env = realm->env();
 
   const int argc = args.Length();
   CHECK_GE(argc, 3);
 
-  BufferValue path(env->isolate(), args[0]);
+  BufferValue path(realm->isolate(), args[0]);
   CHECK_NOT_NULL(*path);
 
   bool use_bigint = args[1]->IsTrue();
@@ -1212,8 +1214,9 @@ static void LStat(const FunctionCallbackInfo<Value>& args) {
 }
 
 static void FStat(const FunctionCallbackInfo<Value>& args) {
-  BindingData* binding_data = Realm::GetBindingData<BindingData>(args);
-  Environment* env = binding_data->env();
+  Realm* realm = Realm::GetCurrent(args);
+  BindingData* binding_data = realm->GetBindingData<BindingData>();
+  Environment* env = realm->env();
 
   const int argc = args.Length();
   CHECK_GE(argc, 2);
@@ -1244,13 +1247,14 @@ static void FStat(const FunctionCallbackInfo<Value>& args) {
 }
 
 static void StatFs(const FunctionCallbackInfo<Value>& args) {
-  BindingData* binding_data = Realm::GetBindingData<BindingData>(args);
-  Environment* env = binding_data->env();
+  Realm* realm = Realm::GetCurrent(args);
+  BindingData* binding_data = realm->GetBindingData<BindingData>();
+  Environment* env = realm->env();
 
   const int argc = args.Length();
   CHECK_GE(argc, 2);
 
-  BufferValue path(env->isolate(), args[0]);
+  BufferValue path(realm->isolate(), args[0]);
   CHECK_NOT_NULL(*path);
   THROW_IF_INSUFFICIENT_PERMISSIONS(
       env, permission::PermissionScope::kFileSystemRead, path.ToStringView());

src/node_realm-inl.h

@@ -67,16 +67,17 @@ inline T* Realm::GetBindingData(
 template <typename T>
 inline T* Realm::GetBindingData(v8::Local<v8::Context> context) {
   Realm* realm = GetCurrent(context);
-  DCHECK_NOT_NULL(realm);
-  BindingDataStore* map = realm->binding_data_store();
-  DCHECK_NOT_NULL(map);
+  return realm->GetBindingData<T>();
+}
+
+template <typename T>
+inline T* Realm::GetBindingData() {
   constexpr size_t binding_index = static_cast<size_t>(T::binding_type_int);
   static_assert(binding_index < std::tuple_size_v<BindingDataStore>);
-  auto ptr = (*map)[binding_index];
+  auto ptr = binding_data_store_[binding_index];
   if (UNLIKELY(!ptr)) return nullptr;
   T* result = static_cast<T*>(ptr.get());
   DCHECK_NOT_NULL(result);
-  DCHECK_EQ(result->realm(), GetCurrent(context));
   return result;
 }