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// 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. #ifndef SRC_BASE_OBJECT_H_ #define SRC_BASE_OBJECT_H_ #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS #include "memory_tracker.h" #include "v8.h" #include <type_traits> // std::remove_reference namespace node { class Environment; class BaseObject : public MemoryRetainer { public: // Associates this object with `object`. It uses the 0th internal field for // that, and in particular aborts if there is no such field. inline BaseObject(Environment* env, v8::Local<v8::Object> object); inline ~BaseObject() override; BaseObject() = delete; // Returns the wrapped object. Returns an empty handle when // persistent.IsEmpty() is true. inline v8::Local<v8::Object> object() const; // Same as the above, except it additionally verifies that this object // is associated with the passed Isolate in debug mode. inline v8::Local<v8::Object> object(v8::Isolate* isolate) const; inline v8::Global<v8::Object>& persistent(); inline Environment* env() const; // Get a BaseObject* pointer, or subclass pointer, for the JS object that // was also passed to the `BaseObject()` constructor initially. // This may return `nullptr` if the C++ object has not been constructed yet, // e.g. when the JS object used `MakeLazilyInitializedJSTemplate`. static inline BaseObject* FromJSObject(v8::Local<v8::Object> object); template <typename T> static inline T* FromJSObject(v8::Local<v8::Object> object); // Make the `v8::Global` a weak reference and, `delete` this object once // the JS object has been garbage collected. inline void MakeWeak(); // Undo `MakeWeak()`, i.e. turn this into a strong reference. inline void ClearWeak(); // Utility to create a FunctionTemplate with one internal field (used for // the `BaseObject*` pointer) and a constructor that initializes that field // to `nullptr`. static inline v8::Local<v8::FunctionTemplate> MakeLazilyInitializedJSTemplate( Environment* env); // Setter/Getter pair for internal fields that can be passed to SetAccessor. template <int Field> static void InternalFieldGet(v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& info); template <int Field, bool (v8::Value::* typecheck)() const> static void InternalFieldSet(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info); // This is a bit of a hack. See the override in async_wrap.cc for details. virtual bool IsDoneInitializing() const; protected: // Can be used to avoid the automatic object deletion when the Environment // exits, for example when this object is owned and deleted by another // BaseObject at that point. inline void RemoveCleanupHook(); private: v8::Local<v8::Object> WrappedObject() const override; static void DeleteMe(void* data); // persistent_handle_ needs to be at a fixed offset from the start of the // class because it is used by src/node_postmortem_metadata.cc to calculate // offsets and generate debug symbols for BaseObject, which assumes that the // position of members in memory are predictable. For more information please // refer to `doc/guides/node-postmortem-support.md` friend int GenDebugSymbols(); friend class CleanupHookCallback; v8::Global<v8::Object> persistent_handle_; Environment* env_; }; // Global alias for FromJSObject() to avoid churn. template <typename T> inline T* Unwrap(v8::Local<v8::Object> obj) { return BaseObject::FromJSObject<T>(obj); } #define ASSIGN_OR_RETURN_UNWRAP(ptr, obj, ...) \ do { \ *ptr = static_cast<typename std::remove_reference<decltype(*ptr)>::type>( \ BaseObject::FromJSObject(obj)); \ if (*ptr == nullptr) \ return __VA_ARGS__; \ } while (0) } // namespace node #endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS #endif // SRC_BASE_OBJECT_H_