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File Name : node_object_wrap.h

// 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_NODE_OBJECT_WRAP_H_
#define SRC_NODE_OBJECT_WRAP_H_

#include "v8.h"
#include <cassert>

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

#endif  // SRC_NODE_OBJECT_WRAP_H_

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-04-19 10:48:34
..	dir	-	root/root	0755	2026-05-09 04:26:47
cppgc	dir	-	root/root	0755	2024-04-19 10:48:34
libplatform	dir	-	root/root	0755	2024-04-19 10:48:34
openssl	dir	-	root/root	0755	2024-04-19 10:48:34
uv	dir	-	root/root	0755	2024-04-19 10:48:34
common.gypi	text/plain	20.9 KB	root/root	0644	2023-03-28 08:16:29
config.gypi	text/plain	24.04 KB	root/root	0644	2023-08-08 10:22:23
js_native_api.h	text/x-c	30.06 KB	root/root	0644	2023-02-16 03:41:32
js_native_api_types.h	text/x-c	4.41 KB	root/root	0644	2023-02-16 03:41:32
node.h	text/x-c++	50.76 KB	root/root	0644	2023-02-16 03:41:32
node_api.h	text/x-c	12.14 KB	root/root	0644	2023-02-16 03:41:32
node_api_types.h	text/x-c	1.46 KB	root/root	0644	2023-02-16 03:41:32
node_buffer.h	text/x-c++	3.6 KB	root/root	0644	2022-04-07 06:19:50
node_object_wrap.h	text/x-c++	3.78 KB	root/root	0644	2021-10-14 05:50:37
node_version.h	text/x-c	3.69 KB	root/root	0644	2023-08-08 01:05:06
uv.h	text/x-c	65.59 KB	root/root	0644	2023-02-16 03:41:30
v8-internal.h	text/x-c++	18.95 KB	root/root	0644	2023-02-16 03:41:30
v8-platform.h	text/x-c++	24.27 KB	root/root	0644	2023-02-16 03:41:30
v8-profiler.h	text/x-c++	35.16 KB	root/root	0644	2023-02-16 03:41:30
v8-version.h	text/x-c	772 B	root/root	0644	2023-02-16 03:41:30
v8.h	text/x-c++	412.78 KB	root/root	0644	2023-02-16 03:41:30
v8config.h	text/x-c	17.09 KB	root/root	0644	2023-02-16 03:41:30
zconf.h	text/x-c	16.4 KB	root/root	0644	2021-10-14 05:50:37
zlib.h	text/x-c	94.48 KB	root/root	0644	2021-10-14 05:50:37

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