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#ifndef SRC_REQ_WRAP_H_ #define SRC_REQ_WRAP_H_ #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS #include "async_wrap.h" #include "env.h" #include "util.h" #include "v8.h" namespace node { class ReqWrapBase { public: explicit inline ReqWrapBase(Environment* env); virtual ~ReqWrapBase() = default; virtual void Cancel() = 0; virtual AsyncWrap* GetAsyncWrap() = 0; private: friend int GenDebugSymbols(); friend class Environment; ListNode<ReqWrapBase> req_wrap_queue_; }; template <typename T> class ReqWrap : public AsyncWrap, public ReqWrapBase { public: inline ReqWrap(Environment* env, v8::Local<v8::Object> object, AsyncWrap::ProviderType provider); inline ~ReqWrap() override; // Call this after the req has been dispatched, if that did not already // happen by using Dispatch(). inline void Dispatched(); // Call this after a request has finished, if re-using this object is planned. inline void Reset(); T* req() { return &req_; } inline void Cancel() final; inline AsyncWrap* GetAsyncWrap() override; static ReqWrap* from_req(T* req); template <typename LibuvFunction, typename... Args> inline int Dispatch(LibuvFunction fn, Args... args); private: friend int GenDebugSymbols(); template <typename ReqT, typename U> friend struct MakeLibuvRequestCallback; typedef void (*callback_t)(); callback_t original_callback_ = nullptr; protected: // req_wrap_queue_ needs to be at a fixed offset from the start of the class // because it is used by ContainerOf to calculate the address of the embedding // ReqWrap. ContainerOf compiles down to simple, fixed pointer arithmetic. It // is also used by src/node_postmortem_metadata.cc to calculate offsets and // generate debug symbols for ReqWrap, which assumes that the position of // members in memory are predictable. sizeof(req_) depends on the type of T, // so req_wrap_queue_ would no longer be at a fixed offset if it came after // req_. For more information please refer to // `doc/guides/node-postmortem-support.md` T req_; }; } // namespace node #endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS #endif // SRC_REQ_WRAP_H_