node/src/node_object_wrap.h at master · bfsoft/node · GitHub

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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 object_wrap_h

#define object_wrap_h

#include "node.h"

#include "v8.h"

#include <assert.h>

// Explicitly instantiate some template classes, so we're sure they will be

// present in the binary / shared object. There isn't much doubt that they will

// be, but MSVC tends to complain about these things.

#ifdef _MSC_VER

template class NODE_EXTERN v8::Persistent<v8::Object>;

template class NODE_EXTERN v8::Persistent<v8::FunctionTemplate>;

#endif

namespace node {

extern v8::Isolate* node_isolate;

class NODE_EXTERN ObjectWrap {

public:

ObjectWrap ( ) {

refs_ = 0;

}

virtual ~ObjectWrap ( ) {

if (!handle_.IsEmpty()) {

assert(handle_.IsNearDeath(node_isolate));

handle_.ClearWeak(node_isolate);

handle_->SetInternalField(0, v8::Undefined());

handle_.Dispose(node_isolate);

handle_.Clear();

}

template <class T>

static inline T* Unwrap (v8::Handle<v8::Object> handle) {

assert(!handle.IsEmpty());

assert(handle->InternalFieldCount() > 0);

return static_cast<T*>(handle->GetAlignedPointerFromInternalField(0));

}

v8::Persistent<v8::Object> handle_; // ro

protected:

inline void Wrap (v8::Handle<v8::Object> handle) {

assert(handle_.IsEmpty());

assert(handle->InternalFieldCount() > 0);

handle_ = v8::Persistent<v8::Object>::New(node_isolate, handle);

handle_->SetAlignedPointerInInternalField(0, this);

MakeWeak();

}

inline void MakeWeak (void) {

handle_.MakeWeak(node_isolate, this, WeakCallback);

handle_.MarkIndependent(node_isolate);

}

/* 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(!handle_.IsEmpty());

refs_++;

handle_.ClearWeak(node_isolate);

}

/* 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

* persistant handle.)

* DO NOT CALL THIS FROM DESTRUCTOR

virtual void Unref() {

assert(!handle_.IsEmpty());

assert(!handle_.IsWeak(node_isolate));

assert(refs_ > 0);

if (--refs_ == 0) { MakeWeak(); }

}

int refs_; // ro

private:

static void WeakCallback(v8::Isolate* env,

v8::Persistent<v8::Value> value,

void* data) {

v8::HandleScope scope;

ObjectWrap *obj = static_cast<ObjectWrap*>(data);

assert(value == obj->handle_);

assert(!obj->refs_);

assert(value.IsNearDeath(env));

delete obj;

}

};

} // namespace node

#endif // object_wrap_h

node/src/node_object_wrap.h at master · bfsoft/node · GitHub

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