/*********************************************************************
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* NAN - Native Abstractions for Node.js
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*
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* Copyright (c) 2018 NAN contributors
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*
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* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
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********************************************************************/
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#ifndef NAN_OBJECT_WRAP_H_
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#define NAN_OBJECT_WRAP_H_
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class ObjectWrap {
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public:
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ObjectWrap() {
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refs_ = 0;
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}
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virtual ~ObjectWrap() {
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if (persistent().IsEmpty()) {
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return;
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}
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persistent().ClearWeak();
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persistent().Reset();
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}
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template <class T>
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static inline T* Unwrap(v8::Local<v8::Object> object) {
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assert(!object.IsEmpty());
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assert(object->InternalFieldCount() > 0);
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// Cast to ObjectWrap before casting to T. A direct cast from void
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// to T won't work right when T has more than one base class.
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void* ptr = GetInternalFieldPointer(object, 0);
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ObjectWrap* wrap = static_cast<ObjectWrap*>(ptr);
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return static_cast<T*>(wrap);
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}
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inline v8::Local<v8::Object> handle() const {
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return New(handle_);
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}
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inline Persistent<v8::Object>& persistent() {
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return handle_;
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}
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protected:
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inline void Wrap(v8::Local<v8::Object> object) {
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assert(persistent().IsEmpty());
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assert(object->InternalFieldCount() > 0);
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SetInternalFieldPointer(object, 0, this);
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persistent().Reset(object);
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MakeWeak();
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}
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#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \
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(V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
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inline void MakeWeak() {
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persistent().v8::PersistentBase<v8::Object>::SetWeak(
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this, WeakCallback, v8::WeakCallbackType::kParameter);
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#if NODE_MAJOR_VERSION < 10
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// FIXME(bnoordhuis) Probably superfluous in older Node.js versions too.
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persistent().MarkIndependent();
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#endif
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}
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#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
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inline void MakeWeak() {
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persistent().v8::PersistentBase<v8::Object>::SetWeak(this, WeakCallback);
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persistent().MarkIndependent();
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}
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#else
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inline void MakeWeak() {
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persistent().persistent.MakeWeak(this, WeakCallback);
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persistent().MarkIndependent();
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}
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#endif
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/* Ref() marks the object as being attached to an event loop.
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* Refed objects will not be garbage collected, even if
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* all references are lost.
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*/
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virtual void Ref() {
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assert(!persistent().IsEmpty());
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persistent().ClearWeak();
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refs_++;
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}
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/* Unref() marks an object as detached from the event loop. This is its
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* default state. When an object with a "weak" reference changes from
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* attached to detached state it will be freed. Be careful not to access
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* the object after making this call as it might be gone!
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* (A "weak reference" means an object that only has a
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* persistent handle.)
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*
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* DO NOT CALL THIS FROM DESTRUCTOR
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*/
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virtual void Unref() {
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assert(!persistent().IsEmpty());
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assert(!persistent().IsWeak());
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assert(refs_ > 0);
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if (--refs_ == 0)
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MakeWeak();
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}
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int refs_; // ro
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private:
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NAN_DISALLOW_ASSIGN_COPY_MOVE(ObjectWrap)
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#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \
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(V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
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static void
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WeakCallback(v8::WeakCallbackInfo<ObjectWrap> const& info) {
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ObjectWrap* wrap = info.GetParameter();
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assert(wrap->refs_ == 0);
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wrap->handle_.Reset();
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delete wrap;
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}
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#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
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static void
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WeakCallback(v8::WeakCallbackData<v8::Object, ObjectWrap> const& data) {
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ObjectWrap* wrap = data.GetParameter();
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assert(wrap->refs_ == 0);
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assert(wrap->handle_.IsNearDeath());
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wrap->handle_.Reset();
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delete wrap;
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}
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#else
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static void WeakCallback(v8::Persistent<v8::Value> value, void *data) {
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ObjectWrap *wrap = static_cast<ObjectWrap*>(data);
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assert(wrap->refs_ == 0);
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assert(wrap->handle_.IsNearDeath());
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wrap->handle_.Reset();
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delete wrap;
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}
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#endif
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Persistent<v8::Object> handle_;
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};
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#endif // NAN_OBJECT_WRAP_H_
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