File size: 4,097 Bytes
19605ab |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 |
/*********************************************************************
* 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;
}
assert(persistent().IsNearDeath());
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);
persistent().MarkIndependent();
}
#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
* persistant 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);
assert(wrap->handle_.IsNearDeath());
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_
|