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79 lines (60 loc) · 2.26 KB
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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 "util.h"
#include "v8.h"
namespace node {
class Environment;
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);
inline bool IsDispatched();
private:
friend int GenDebugSymbols();
// Adding `friend struct MakeLibuvRequestCallback` is not enough anymore
// for some reason. Consider this private.
public:
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/contributing/node-postmortem-support.md`
T req_;
};
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_REQ_WRAP_H_