src: use the internal field to determine if an object is a BaseObject

Instead of storing the function template of BaseObject for checking
if an object is BaseObject by calling HasInstance, simply checks
the first internal field of the object, which is always set in the
BaseObject constructor. This is simpler and faster
(there is now no need to iterate over the inheritance for the check).

src/async_wrap.cc

@@ -342,7 +342,6 @@ Local<FunctionTemplate> AsyncWrap::GetConstructorTemplate(
     tmpl = NewFunctionTemplate(isolate, nullptr);
     tmpl->SetClassName(
         FIXED_ONE_BYTE_STRING(isolate_data->isolate(), "AsyncWrap"));
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(isolate_data));
     SetProtoMethod(isolate, tmpl, "getAsyncId", AsyncWrap::GetAsyncId);
     SetProtoMethod(isolate, tmpl, "asyncReset", AsyncWrap::AsyncReset);
     SetProtoMethod(

src/base_object-inl.h

@@ -38,12 +38,6 @@ BaseObject::BaseObject(Environment* env, v8::Local<v8::Object> object)
   // while allowing to create a BaseObject in a vm context.
 }
 
-// static
-v8::Local<v8::FunctionTemplate> BaseObject::GetConstructorTemplate(
-    Environment* env) {
-  return BaseObject::GetConstructorTemplate(env->isolate_data());
-}
-
 void BaseObject::Detach() {
   CHECK_GT(pointer_data()->strong_ptr_count, 0);
   pointer_data()->is_detached = true;
@@ -76,6 +70,15 @@ Realm* BaseObject::realm() const {
   return realm_;
 }
 
+bool BaseObject::IsBaseObject(v8::Local<v8::Object> obj) {
+  if (obj->InternalFieldCount() < BaseObject::kInternalFieldCount) {
+    return false;
+  }
+  void* ptr =
+      obj->GetAlignedPointerFromInternalField(BaseObject::kEmbedderType);
+  return ptr == &kNodeEmbedderId;
+}
+
 void BaseObject::TagNodeObject(v8::Local<v8::Object> object) {
   DCHECK_GE(object->InternalFieldCount(), BaseObject::kInternalFieldCount);
   object->SetAlignedPointerInInternalField(BaseObject::kEmbedderType,

src/base_object.cc

@@ -89,7 +89,6 @@ Local<FunctionTemplate> BaseObject::MakeLazilyInitializedJSTemplate(
     IsolateData* isolate_data) {
   Local<FunctionTemplate> t = NewFunctionTemplate(
       isolate_data->isolate(), LazilyInitializedJSTemplateConstructor);
-  t->Inherit(BaseObject::GetConstructorTemplate(isolate_data));
   t->InstanceTemplate()->SetInternalFieldCount(BaseObject::kInternalFieldCount);
   return t;
 }
@@ -145,18 +144,6 @@ bool BaseObject::IsRootNode() const {
   return !persistent_handle_.IsWeak();
 }
 
-Local<FunctionTemplate> BaseObject::GetConstructorTemplate(
-    IsolateData* isolate_data) {
-  Local<FunctionTemplate> tmpl = isolate_data->base_object_ctor_template();
-  if (tmpl.IsEmpty()) {
-    tmpl = NewFunctionTemplate(isolate_data->isolate(), nullptr);
-    tmpl->SetClassName(
-        FIXED_ONE_BYTE_STRING(isolate_data->isolate(), "BaseObject"));
-    isolate_data->set_base_object_ctor_template(tmpl);
-  }
-  return tmpl;
-}
-
 bool BaseObject::IsNotIndicativeOfMemoryLeakAtExit() const {
   return IsWeakOrDetached();
 }

src/base_object.h

@@ -76,6 +76,7 @@ class BaseObject : public MemoryRetainer {
   // e.g. when the JS object used `MakeLazilyInitializedJSTemplate`.
   static inline void SetInternalFields(v8::Local<v8::Object> object,
                                        void* slot);
+  static inline bool IsBaseObject(v8::Local<v8::Object> object);
   static inline void TagNodeObject(v8::Local<v8::Object> object);
   static void LazilyInitializedJSTemplateConstructor(
       const v8::FunctionCallbackInfo<v8::Value>& args);

src/crypto/crypto_cipher.cc

@@ -277,9 +277,7 @@ void CipherBase::Initialize(Environment* env, Local<Object> target) {
 
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
 
-  t->InstanceTemplate()->SetInternalFieldCount(
-      CipherBase::kInternalFieldCount);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
+  t->InstanceTemplate()->SetInternalFieldCount(CipherBase::kInternalFieldCount);
 
   SetProtoMethod(isolate, t, "init", Init);
   SetProtoMethod(isolate, t, "initiv", InitIv);

src/crypto/crypto_context.cc

@@ -268,7 +268,6 @@ Local<FunctionTemplate> SecureContext::GetConstructorTemplate(
     tmpl = NewFunctionTemplate(isolate, New);
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         SecureContext::kInternalFieldCount);
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     tmpl->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "SecureContext"));
 
     SetProtoMethod(isolate, tmpl, "init", Init);

src/crypto/crypto_dh.cc

@@ -69,7 +69,6 @@ void DiffieHellman::Initialize(Environment* env, Local<Object> target) {
 
     t->InstanceTemplate()->SetInternalFieldCount(
         DiffieHellman::kInternalFieldCount);
-    t->Inherit(BaseObject::GetConstructorTemplate(env));
 
     SetProtoMethod(isolate, t, "generateKeys", GenerateKeys);
     SetProtoMethod(isolate, t, "computeSecret", ComputeSecret);

src/crypto/crypto_ec.cc

@@ -66,7 +66,6 @@ void ECDH::Initialize(Environment* env, Local<Object> target) {
   Local<Context> context = env->context();
 
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
 
   t->InstanceTemplate()->SetInternalFieldCount(ECDH::kInternalFieldCount);
 

src/crypto/crypto_hash.cc

@@ -57,9 +57,7 @@ void Hash::Initialize(Environment* env, Local<Object> target) {
   Local<Context> context = env->context();
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
 
-  t->InstanceTemplate()->SetInternalFieldCount(
-      Hash::kInternalFieldCount);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
+  t->InstanceTemplate()->SetInternalFieldCount(Hash::kInternalFieldCount);
 
   SetProtoMethod(isolate, t, "update", HashUpdate);
   SetProtoMethod(isolate, t, "digest", HashDigest);

src/crypto/crypto_hmac.cc

@@ -41,9 +41,7 @@ void Hmac::Initialize(Environment* env, Local<Object> target) {
   Isolate* isolate = env->isolate();
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
 
-  t->InstanceTemplate()->SetInternalFieldCount(
-      Hmac::kInternalFieldCount);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
+  t->InstanceTemplate()->SetInternalFieldCount(Hmac::kInternalFieldCount);
 
   SetProtoMethod(isolate, t, "init", HmacInit);
   SetProtoMethod(isolate, t, "update", HmacUpdate);

src/crypto/crypto_keys.cc

@@ -901,7 +901,6 @@ v8::Local<v8::Function> KeyObjectHandle::Initialize(Environment* env) {
     templ = NewFunctionTemplate(isolate, New);
     templ->InstanceTemplate()->SetInternalFieldCount(
         KeyObjectHandle::kInternalFieldCount);
-    templ->Inherit(BaseObject::GetConstructorTemplate(env));
 
     SetProtoMethod(isolate, templ, "init", Init);
     SetProtoMethodNoSideEffect(
@@ -1342,7 +1341,6 @@ void NativeKeyObject::CreateNativeKeyObjectClass(
       NewFunctionTemplate(isolate, NativeKeyObject::New);
   t->InstanceTemplate()->SetInternalFieldCount(
       KeyObjectHandle::kInternalFieldCount);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
 
   Local<Value> ctor;
   if (!t->GetFunction(env->context()).ToLocal(&ctor))

src/crypto/crypto_sig.cc

@@ -329,9 +329,7 @@ void Sign::Initialize(Environment* env, Local<Object> target) {
   Isolate* isolate = env->isolate();
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
 
-  t->InstanceTemplate()->SetInternalFieldCount(
-      SignBase::kInternalFieldCount);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
+  t->InstanceTemplate()->SetInternalFieldCount(SignBase::kInternalFieldCount);
 
   SetProtoMethod(isolate, t, "init", SignInit);
   SetProtoMethod(isolate, t, "update", SignUpdate);
@@ -459,9 +457,7 @@ void Verify::Initialize(Environment* env, Local<Object> target) {
   Isolate* isolate = env->isolate();
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
 
-  t->InstanceTemplate()->SetInternalFieldCount(
-      SignBase::kInternalFieldCount);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
+  t->InstanceTemplate()->SetInternalFieldCount(SignBase::kInternalFieldCount);
 
   SetProtoMethod(isolate, t, "init", VerifyInit);
   SetProtoMethod(isolate, t, "update", VerifyUpdate);

src/crypto/crypto_x509.cc

@@ -59,7 +59,6 @@ Local<FunctionTemplate> X509Certificate::GetConstructorTemplate(
     tmpl = NewFunctionTemplate(isolate, nullptr);
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         BaseObject::kInternalFieldCount);
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     tmpl->SetClassName(
         FIXED_ONE_BYTE_STRING(env->isolate(), "X509Certificate"));
     SetProtoMethod(isolate, tmpl, "subject", Subject);

src/env.cc

@@ -480,7 +480,6 @@ void IsolateData::CreateProperties() {
   Local<FunctionTemplate> templ = FunctionTemplate::New(isolate());
   templ->InstanceTemplate()->SetInternalFieldCount(
       BaseObject::kInternalFieldCount);
-  templ->Inherit(BaseObject::GetConstructorTemplate(this));
   set_binding_data_ctor_template(templ);
   binding::CreateInternalBindingTemplates(this);
 

src/env_properties.h

@@ -330,7 +330,6 @@
 #define PER_ISOLATE_TEMPLATE_PROPERTIES(V)                                     \
   V(async_wrap_ctor_template, v8::FunctionTemplate)                            \
   V(async_wrap_object_ctor_template, v8::FunctionTemplate)                     \
-  V(base_object_ctor_template, v8::FunctionTemplate)                           \
   V(binding_data_ctor_template, v8::FunctionTemplate)                          \
   V(blob_constructor_template, v8::FunctionTemplate)                           \
   V(blob_reader_constructor_template, v8::FunctionTemplate)                    \

src/histogram.cc

@@ -288,7 +288,6 @@ Local<FunctionTemplate> HistogramBase::GetConstructorTemplate(
     tmpl = NewFunctionTemplate(isolate, New);
     Local<String> classname = FIXED_ONE_BYTE_STRING(isolate, "Histogram");
     tmpl->SetClassName(classname);
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(isolate_data));
 
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         HistogramBase::kInternalFieldCount);

src/module_wrap.cc

@@ -768,7 +768,6 @@ void ModuleWrap::Initialize(Local<Object> target,
   Local<FunctionTemplate> tpl = NewFunctionTemplate(isolate, New);
   tpl->InstanceTemplate()->SetInternalFieldCount(
       ModuleWrap::kInternalFieldCount);
-  tpl->Inherit(BaseObject::GetConstructorTemplate(env));
 
   SetProtoMethod(isolate, tpl, "link", Link);
   SetProtoMethod(isolate, tpl, "instantiate", Instantiate);

src/node_binding.cc

@@ -565,7 +565,6 @@ void CreateInternalBindingTemplates(IsolateData* isolate_data) {
         FunctionTemplate::New(isolate_data->isolate());                        \
     templ->InstanceTemplate()->SetInternalFieldCount(                          \
         BaseObject::kInternalFieldCount);                                      \
-    templ->Inherit(BaseObject::GetConstructorTemplate(isolate_data));          \
     _register_isolate_##modname(isolate_data, templ);                          \
     isolate_data->set_##modname##_binding(templ);                              \
   } while (0);

src/node_blob.cc

@@ -131,7 +131,6 @@ Local<FunctionTemplate> Blob::GetConstructorTemplate(Environment* env) {
     tmpl = NewFunctionTemplate(isolate, nullptr);
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         BaseObject::kInternalFieldCount);
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     tmpl->SetClassName(
         FIXED_ONE_BYTE_STRING(env->isolate(), "Blob"));
     SetProtoMethod(isolate, tmpl, "getReader", GetReader);
@@ -281,7 +280,6 @@ Local<FunctionTemplate> Blob::Reader::GetConstructorTemplate(Environment* env) {
     tmpl = NewFunctionTemplate(isolate, nullptr);
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         BaseObject::kInternalFieldCount);
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     tmpl->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "BlobReader"));
     SetProtoMethod(env->isolate(), tmpl, "pull", Pull);
     env->set_blob_reader_constructor_template(tmpl);

src/node_i18n.cc

@@ -875,7 +875,6 @@ static void CreatePerIsolateProperties(IsolateData* isolate_data,
   // ConverterObject
   {
     Local<FunctionTemplate> t = NewFunctionTemplate(isolate, nullptr);
-    t->Inherit(BaseObject::GetConstructorTemplate(isolate_data));
     t->InstanceTemplate()->SetInternalFieldCount(
         ConverterObject::kInternalFieldCount);
     Local<String> converter_string =

src/node_messaging.cc

@@ -301,7 +301,7 @@ class SerializerDelegate : public ValueSerializer::Delegate {
   }
 
   Maybe<bool> WriteHostObject(Isolate* isolate, Local<Object> object) override {
-    if (env_->base_object_ctor_template()->HasInstance(object)) {
+    if (BaseObject::IsBaseObject(object)) {
       return WriteHostObject(
           BaseObjectPtr<BaseObject> { Unwrap<BaseObject>(object) });
     }
@@ -490,7 +490,8 @@ Maybe<bool> Message::Serialize(Environment* env,
       array_buffers.push_back(ab);
       serializer.TransferArrayBuffer(id, ab);
       continue;
-    } else if (env->base_object_ctor_template()->HasInstance(entry)) {
+    } else if (entry->IsObject() &&
+               BaseObject::IsBaseObject(entry.As<Object>())) {
       // Check if the source MessagePort is being transferred.
       if (!source_port.IsEmpty() && entry == source_port) {
         ThrowDataCloneException(
@@ -1257,7 +1258,7 @@ JSTransferable::NestedTransferables() const {
     Local<Value> value;
     if (!list->Get(context, i).ToLocal(&value))
       return Nothing<BaseObjectList>();
-    if (env()->base_object_ctor_template()->HasInstance(value))
+    if (value->IsObject() && BaseObject::IsBaseObject(value.As<Object>()))
       ret.emplace_back(Unwrap<BaseObject>(value));
   }
   return Just(ret);
@@ -1309,9 +1310,10 @@ BaseObjectPtr<BaseObject> JSTransferable::Data::Deserialize(
 
   Local<Value> ret;
   CHECK(!env->messaging_deserialize_create_object().IsEmpty());
-  if (!env->messaging_deserialize_create_object()->Call(
-          context, Null(env->isolate()), 1, &info).ToLocal(&ret) ||
-      !env->base_object_ctor_template()->HasInstance(ret)) {
+  if (!env->messaging_deserialize_create_object()
+           ->Call(context, Null(env->isolate()), 1, &info)
+           .ToLocal(&ret) ||
+      !ret->IsObject() || !BaseObject::IsBaseObject(ret.As<Object>())) {
     return {};
   }
 
@@ -1492,7 +1494,6 @@ static void InitMessaging(Local<Object> target,
   {
     Local<FunctionTemplate> t =
         NewFunctionTemplate(isolate, JSTransferable::New);
-    t->Inherit(BaseObject::GetConstructorTemplate(env));
     t->InstanceTemplate()->SetInternalFieldCount(
         JSTransferable::kInternalFieldCount);
     SetConstructorFunction(context, target, "JSTransferable", t);

src/node_serdes.cc

@@ -462,7 +462,6 @@ void Initialize(Local<Object> target,
 
   ser->InstanceTemplate()->SetInternalFieldCount(
       SerializerContext::kInternalFieldCount);
-  ser->Inherit(BaseObject::GetConstructorTemplate(env));
 
   SetProtoMethod(isolate, ser, "writeHeader", SerializerContext::WriteHeader);
   SetProtoMethod(isolate, ser, "writeValue", SerializerContext::WriteValue);
@@ -490,7 +489,6 @@ void Initialize(Local<Object> target,
 
   des->InstanceTemplate()->SetInternalFieldCount(
       DeserializerContext::kInternalFieldCount);
-  des->Inherit(BaseObject::GetConstructorTemplate(env));
 
   SetProtoMethod(isolate, des, "readHeader", DeserializerContext::ReadHeader);
   SetProtoMethod(isolate, des, "readValue", DeserializerContext::ReadValue);

src/node_snapshotable.cc

@@ -1369,18 +1369,7 @@ StartupData SerializeNodeContextInternalFields(Local<Object> holder,
   // (most importantly, BaseObject::kSlot).
   // For Node.js this design is enough for all the native binding that are
   // serializable.
-  if (index != BaseObject::kEmbedderType) {
-    return StartupData{nullptr, 0};
-  }
-
-  void* type_ptr = holder->GetAlignedPointerFromInternalField(index);
-  if (type_ptr == nullptr) {
-    return StartupData{nullptr, 0};
-  }
-
-  uint16_t type = *(static_cast<uint16_t*>(type_ptr));
-  per_process::Debug(DebugCategory::MKSNAPSHOT, "type = 0x%x\n", type);
-  if (type != kNodeEmbedderId) {
+  if (index != BaseObject::kEmbedderType || !BaseObject::IsBaseObject(holder)) {
     return StartupData{nullptr, 0};
   }
 

src/node_sockaddr.cc

@@ -701,7 +701,6 @@ Local<FunctionTemplate> SocketAddressBlockListWrap::GetConstructorTemplate(
     Isolate* isolate = env->isolate();
     tmpl = NewFunctionTemplate(isolate, SocketAddressBlockListWrap::New);
     tmpl->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "BlockList"));
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     tmpl->InstanceTemplate()->SetInternalFieldCount(kInternalFieldCount);
     SetProtoMethod(isolate, tmpl, "addAddress", AddAddress);
     SetProtoMethod(isolate, tmpl, "addRange", AddRange);
@@ -757,7 +756,6 @@ Local<FunctionTemplate> SocketAddressBase::GetConstructorTemplate(
     tmpl->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "SocketAddress"));
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         SocketAddressBase::kInternalFieldCount);
-    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     SetProtoMethod(isolate, tmpl, "detail", Detail);
     SetProtoMethod(isolate, tmpl, "legacyDetail", LegacyDetail);
     SetProtoMethodNoSideEffect(isolate, tmpl, "flowlabel", GetFlowLabel);

src/node_trace_events.cc

@@ -137,7 +137,6 @@ void NodeCategorySet::Initialize(Local<Object> target,
       NewFunctionTemplate(isolate, NodeCategorySet::New);
   category_set->InstanceTemplate()->SetInternalFieldCount(
       NodeCategorySet::kInternalFieldCount);
-  category_set->Inherit(BaseObject::GetConstructorTemplate(env));
   SetProtoMethod(isolate, category_set, "enable", NodeCategorySet::Enable);
   SetProtoMethod(isolate, category_set, "disable", NodeCategorySet::Disable);
 

src/node_util.cc

@@ -468,7 +468,6 @@ void Initialize(Local<Object> target,
       NewFunctionTemplate(isolate, WeakReference::New);
   weak_ref->InstanceTemplate()->SetInternalFieldCount(
       WeakReference::kInternalFieldCount);
-  weak_ref->Inherit(BaseObject::GetConstructorTemplate(env));
   SetProtoMethod(isolate, weak_ref, "get", WeakReference::Get);
   SetProtoMethod(isolate, weak_ref, "getRef", WeakReference::GetRef);
   SetProtoMethod(isolate, weak_ref, "incRef", WeakReference::IncRef);

src/node_wasi.cc

@@ -1271,7 +1271,6 @@ static void InitializePreview1(Local<Object> target,
 
   Local<FunctionTemplate> tmpl = NewFunctionTemplate(isolate, WASI::New);
   tmpl->InstanceTemplate()->SetInternalFieldCount(WASI::kInternalFieldCount);
-  tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
 
 #define V(F, name)                                                             \
   SetFunction<decltype(&WASI::F), WASI::F>(WASI::F, env, name, tmpl);

src/node_wasm_web_api.cc

@@ -28,7 +28,6 @@ Local<Function> WasmStreamingObject::Initialize(Environment* env) {
 
   Isolate* isolate = env->isolate();
   Local<FunctionTemplate> t = NewFunctionTemplate(isolate, New);
-  t->Inherit(BaseObject::GetConstructorTemplate(env));
   t->InstanceTemplate()->SetInternalFieldCount(
       WasmStreamingObject::kInternalFieldCount);