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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_HANDLE_WRAP_H_
#define SRC_HANDLE_WRAP_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "async_wrap.h"
#include "util.h"
#include "uv.h"
#include "v8.h"
namespace node {
class Environment;
class ExternalReferenceRegistry;
// Rules:
//
// - Do not throw from handle methods. Set errno.
//
// - MakeCallback may only be made directly off the event loop.
// That is there can be no JavaScript stack frames underneath it.
// (Is there any way to assert that?)
//
// - No use of v8::WeakReferenceCallback. The close callback signifies that
// we're done with a handle - external resources can be freed.
//
// - Reusable?
//
// - The uv_close_cb is used to free the c++ object. The close callback
// is not made into javascript land.
//
// - uv_ref, uv_unref counts are managed at this layer to avoid needless
// js/c++ boundary crossing. At the javascript layer that should all be
// taken care of.
class HandleWrap : public AsyncWrap {
public:
static void Close(const v8::FunctionCallbackInfo<v8::Value>& args);
static void Ref(const v8::FunctionCallbackInfo<v8::Value>& args);
static void Unref(const v8::FunctionCallbackInfo<v8::Value>& args);
static void HasRef(const v8::FunctionCallbackInfo<v8::Value>& args);
static inline bool IsAlive(const HandleWrap* wrap) {
return wrap != nullptr &&
wrap->IsDoneInitializing() &&
wrap->state_ != kClosed;
}
static inline bool HasRef(const HandleWrap* wrap) {
return IsAlive(wrap) && uv_has_ref(wrap->GetHandle());
}
inline uv_handle_t* GetHandle() const { return handle_; }
virtual void Close(
v8::Local<v8::Value> close_callback = v8::Local<v8::Value>());
static v8::Local<v8::FunctionTemplate> GetConstructorTemplate(
Environment* env);
static void RegisterExternalReferences(ExternalReferenceRegistry* registry);
protected:
HandleWrap(Environment* env,
v8::Local<v8::Object> object,
uv_handle_t* handle,
AsyncWrap::ProviderType provider);
virtual void OnClose() {}
void OnGCCollect() final;
bool IsNotIndicativeOfMemoryLeakAtExit() const override;
void MarkAsInitialized();
void MarkAsUninitialized();
inline bool IsHandleClosing() const {
return state_ == kClosing || state_ == kClosed;
}
static void OnClose(uv_handle_t* handle);
private:
friend class Environment;
friend void GetActiveHandles(const v8::FunctionCallbackInfo<v8::Value>&);
// handle_wrap_queue_ 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 HandleWrap, 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();
ListNode<HandleWrap> handle_wrap_queue_;
enum { kInitialized, kClosing, kClosed } state_;
uv_handle_t* const handle_;
};
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_HANDLE_WRAP_H_
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