| // Copyright Joyent, Inc. and other Node contributors. | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a | |
| // copy of this software and associated documentation files (the | |
| // "Software"), to deal in the Software without restriction, including | |
| // without limitation the rights to use, copy, modify, merge, publish, | |
| // distribute, sublicense, and/or sell copies of the Software, and to permit | |
| // persons to whom the Software is furnished to do so, subject to the | |
| // following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included | |
| // in all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN | |
| // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, | |
| // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
| // USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| namespace node { | |
| 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> handle) { | |
| assert(!handle.IsEmpty()); | |
| assert(handle->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 = handle->GetAlignedPointerFromInternalField(0); | |
| ObjectWrap* wrap = static_cast<ObjectWrap*>(ptr); | |
| return static_cast<T*>(wrap); | |
| } | |
| inline v8::Local<v8::Object> handle() { | |
| return handle(v8::Isolate::GetCurrent()); | |
| } | |
| inline v8::Local<v8::Object> handle(v8::Isolate* isolate) { | |
| return v8::Local<v8::Object>::New(isolate, persistent()); | |
| } | |
| // NOLINTNEXTLINE(runtime/v8_persistent) | |
| inline v8::Persistent<v8::Object>& persistent() { | |
| return handle_; | |
| } | |
| protected: | |
| inline void Wrap(v8::Local<v8::Object> handle) { | |
| assert(persistent().IsEmpty()); | |
| assert(handle->InternalFieldCount() > 0); | |
| handle->SetAlignedPointerInInternalField(0, this); | |
| persistent().Reset(v8::Isolate::GetCurrent(), handle); | |
| MakeWeak(); | |
| } | |
| inline void MakeWeak() { | |
| persistent().SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter); | |
| } | |
| /* 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: | |
| static void WeakCallback( | |
| const v8::WeakCallbackInfo<ObjectWrap>& data) { | |
| ObjectWrap* wrap = data.GetParameter(); | |
| assert(wrap->refs_ == 0); | |
| wrap->handle_.Reset(); | |
| delete wrap; | |
| } | |
| // NOLINTNEXTLINE(runtime/v8_persistent) | |
| v8::Persistent<v8::Object> handle_; | |
| }; | |
| } // namespace node | |