src: move handle properties to prototype

Reduce the size of wrap objects by moving a couple of accessors from the
instance template to the prototype template. They occupied one slot per
instance instead of one slot per class.
This commit fixes some instances of unwrapping twice since that code had
to be updated anyway to use `args.This()` instead of `args.Holder()`.
PR-URL: #16482
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: bnoordhuis

src/stream_base-inl.h

@@ -33,26 +33,26 @@ void StreamBase::AddMethods(Environment* env,
 
 enum PropertyAttribute attributes =
 static_cast<PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
- t->InstanceTemplate()->SetAccessor(env->fd_string(),
- GetFD<Base>,
-nullptr,
- env->as_external(),
- v8::DEFAULT,
- attributes);
-
- t->InstanceTemplate()->SetAccessor(env->external_stream_string(),
- GetExternal<Base>,
-nullptr,
- env->as_external(),
- v8::DEFAULT,
- attributes);
-
- t->InstanceTemplate()->SetAccessor(env->bytes_read_string(),
- GetBytesRead<Base>,
-nullptr,
- env->as_external(),
- v8::DEFAULT,
- attributes);
+ t->PrototypeTemplate()->SetAccessor(env->fd_string(),
+GetFD<Base>,
+nullptr,
+env->as_external(),
+v8::DEFAULT,
+attributes);
+
+ t->PrototypeTemplate()->SetAccessor(env->external_stream_string(),
+GetExternal<Base>,
+nullptr,
+env->as_external(),
+v8::DEFAULT,
+attributes);
+
+ t->PrototypeTemplate()->SetAccessor(env->bytes_read_string(),
+GetBytesRead<Base>,
+nullptr,
+env->as_external(),
+v8::DEFAULT,
+attributes);
 
  env->SetProtoMethod(t, "readStart", JSMethod<Base, &StreamBase::ReadStart>);
  env->SetProtoMethod(t, "readStop", JSMethod<Base, &StreamBase::ReadStop>);
@@ -81,11 +81,10 @@ void StreamBase::AddMethods(Environment* env,
 template <classBase>
 voidStreamBase::GetFD(Local<String> key,
 const PropertyCallbackInfo<Value>& args) {
- Base* handle = Unwrap<Base>(args.Holder());
-
 // Mimic implementation of StreamBase::GetFD() and UDPWrap::GetFD().
+ Base* handle;
 ASSIGN_OR_RETURN_UNWRAP(&handle,
- args.Holder(),
+ args.This(),
  args.GetReturnValue().Set(UV_EINVAL));
 
  StreamBase* wrap = static_cast<StreamBase*>(handle);
@@ -99,11 +98,10 @@ void StreamBase::GetFD(Local<String> key,
 template <classBase>
 voidStreamBase::GetBytesRead(Local<String> key,
 const PropertyCallbackInfo<Value>& args) {
- Base* handle = Unwrap<Base>(args.Holder());
-
 // The handle instance hasn't been set. So no bytes could have been read.
+ Base* handle;
 ASSIGN_OR_RETURN_UNWRAP(&handle,
- args.Holder(),
+ args.This(),
  args.GetReturnValue().Set(0));
 
  StreamBase* wrap = static_cast<StreamBase*>(handle);
@@ -115,9 +113,8 @@ void StreamBase::GetBytesRead(Local<String> key,
 template <classBase>
 voidStreamBase::GetExternal(Local<String> key,
 const PropertyCallbackInfo<Value>& args) {
- Base* handle = Unwrap<Base>(args.Holder());
-
-ASSIGN_OR_RETURN_UNWRAP(&handle, args.Holder());
+ Base* handle;
+ASSIGN_OR_RETURN_UNWRAP(&handle, args.This());
 
  StreamBase* wrap = static_cast<StreamBase*>(handle);
  Local<External> ext = External::New(args.GetIsolate(), wrap);
@@ -128,8 +125,7 @@ void StreamBase::GetExternal(Local<String> key,
 template <classBase,
 int (StreamBase::*Method)(const FunctionCallbackInfo<Value>& args)>
 void StreamBase::JSMethod(const FunctionCallbackInfo<Value>& args) {
- Base* handle = Unwrap<Base>(args.Holder());
-
+ Base* handle;
 ASSIGN_OR_RETURN_UNWRAP(&handle, args.Holder());
 
  StreamBase* wrap = static_cast<StreamBase*>(handle);

src/udp_wrap.cc

@@ -113,12 +113,12 @@ void UDPWrap::Initialize(Local<Object> target,
 
 enum PropertyAttribute attributes =
 static_cast<PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
- t->InstanceTemplate()->SetAccessor(env->fd_string(),
- UDPWrap::GetFD,
-nullptr,
- env->as_external(),
- v8::DEFAULT,
- attributes);
+ t->PrototypeTemplate()->SetAccessor(env->fd_string(),
+UDPWrap::GetFD,
+nullptr,
+env->as_external(),
+v8::DEFAULT,
+attributes);
 
  env->SetProtoMethod(t, "bind", Bind);
  env->SetProtoMethod(t, "send", Send);
@@ -169,7 +169,7 @@ void UDPWrap::New(const FunctionCallbackInfo<Value>& args) {
 voidUDPWrap::GetFD(Local<String>, const PropertyCallbackInfo<Value>& args) {
 int fd = UV_EBADF;
 #if !defined(_WIN32)
- UDPWrap* wrap = Unwrap<UDPWrap>(args.Holder());
+ UDPWrap* wrap = Unwrap<UDPWrap>(args.This());
 if (wrap != nullptr)
 uv_fileno(reinterpret_cast<uv_handle_t*>(&wrap->handle_), &fd);
 #endif