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