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✏️ Editing: nan_weak.h

/*********************************************************************
 * NAN - Native Abstractions for Node.js
 *
 * Copyright (c) 2018 NAN contributors
 *
 * MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
 ********************************************************************/

#ifndef NAN_WEAK_H_
#define NAN_WEAK_H_

static const int kInternalFieldsInWeakCallback = 2;
static const int kNoInternalFieldIndex = -1;

#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \
 (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
# define NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ \
 v8::WeakCallbackInfo<WeakCallbackInfo<T> > const&
# define NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ \
 NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
# define NAN_WEAK_PARAMETER_CALLBACK_SIG_ NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
# define NAN_WEAK_TWOFIELD_CALLBACK_SIG_ NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
#elif NODE_MODULE_VERSION > IOJS_1_1_MODULE_VERSION
# define NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ \
 v8::PhantomCallbackData<WeakCallbackInfo<T> > const&
# define NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ \
 NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
# define NAN_WEAK_PARAMETER_CALLBACK_SIG_ NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
# define NAN_WEAK_TWOFIELD_CALLBACK_SIG_ NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
#elif NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
# define NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ \
 v8::PhantomCallbackData<WeakCallbackInfo<T> > const&
# define NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ \
 v8::InternalFieldsCallbackData<WeakCallbackInfo<T>, void> const&
# define NAN_WEAK_PARAMETER_CALLBACK_SIG_ NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
# define NAN_WEAK_TWOFIELD_CALLBACK_SIG_ NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
# define NAN_WEAK_CALLBACK_DATA_TYPE_ \
 v8::WeakCallbackData<S, WeakCallbackInfo<T> > const&
# define NAN_WEAK_CALLBACK_SIG_ NAN_WEAK_CALLBACK_DATA_TYPE_
#else
# define NAN_WEAK_CALLBACK_DATA_TYPE_ void *
# define NAN_WEAK_CALLBACK_SIG_ \
 v8::Persistent<v8::Value>, NAN_WEAK_CALLBACK_DATA_TYPE_
#endif

template<typename T>
class WeakCallbackInfo {
 public:
 typedef void (*Callback)(const WeakCallbackInfo<T>& data);
 WeakCallbackInfo(
 Persistent<v8::Value> *persistent
 , Callback callback
 , void *parameter
 , void *field1 = 0
 , void *field2 = 0) :
 callback_(callback), isolate_(0), parameter_(parameter) {
 std::memcpy(&persistent_, persistent, sizeof (v8::Persistent<v8::Value>));
 internal_fields_[0] = field1;
 internal_fields_[1] = field2;
 }
 inline v8::Isolate *GetIsolate() const { return isolate_; }
 inline T *GetParameter() const { return static_cast<T*>(parameter_); }
 inline void *GetInternalField(int index) const {
 assert((index == 0 || index == 1) && "internal field index out of bounds");
 if (index == 0) {
 return internal_fields_[0];
 } else {
 return internal_fields_[1];
 }
 }

private:
 NAN_DISALLOW_ASSIGN_COPY_MOVE(WeakCallbackInfo)
 Callback callback_;
 v8::Isolate *isolate_;
 void *parameter_;
 void *internal_fields_[kInternalFieldsInWeakCallback];
 v8::Persistent<v8::Value> persistent_;
 template<typename S, typename M> friend class Persistent;
 template<typename S> friend class PersistentBase;
#if NODE_MODULE_VERSION <= NODE_0_12_MODULE_VERSION
# if NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
 template<typename S>
 static void invoke(NAN_WEAK_CALLBACK_SIG_ data);
 template<typename S>
 static WeakCallbackInfo *unwrap(NAN_WEAK_CALLBACK_DATA_TYPE_ data);
# else
 static void invoke(NAN_WEAK_CALLBACK_SIG_ data);
 static WeakCallbackInfo *unwrap(NAN_WEAK_CALLBACK_DATA_TYPE_ data);
# endif
#else
# if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \
 (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
 template<bool isFirstPass>
 static void invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data);
 template<bool isFirstPass>
 static void invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data);
# else
 static void invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data);
 static void invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data);
# endif
 static WeakCallbackInfo *unwrapparameter(
 NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ data);
 static WeakCallbackInfo *unwraptwofield(
 NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ data);
#endif
};

#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))

template<typename T>
template<bool isFirstPass>
void
WeakCallbackInfo<T>::invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data) {
 WeakCallbackInfo<T> *cbinfo = unwrapparameter(data);
 if (isFirstPass) {
 cbinfo->persistent_.Reset();
 data.SetSecondPassCallback(invokeparameter<false>);
 } else {
 cbinfo->callback_(*cbinfo);
 delete cbinfo;
 }
}

template<typename T>
template<bool isFirstPass>
void
WeakCallbackInfo<T>::invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data) {
 WeakCallbackInfo<T> *cbinfo = unwraptwofield(data);
 if (isFirstPass) {
 cbinfo->persistent_.Reset();
 data.SetSecondPassCallback(invoketwofield<false>);
 } else {
 cbinfo->callback_(*cbinfo);
 delete cbinfo;
 }
}

template<typename T>
WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrapparameter(
 NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ data) {
 WeakCallbackInfo<T> *cbinfo =
 static_cast<WeakCallbackInfo<T>*>(data.GetParameter());
 cbinfo->isolate_ = data.GetIsolate();
 return cbinfo;
}

template<typename T>
WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwraptwofield(
 NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ data) {
 WeakCallbackInfo<T> *cbinfo =
 static_cast<WeakCallbackInfo<T>*>(data.GetInternalField(0));
 cbinfo->isolate_ = data.GetIsolate();
 return cbinfo;
}

#undef NAN_WEAK_PARAMETER_CALLBACK_SIG_
#undef NAN_WEAK_TWOFIELD_CALLBACK_SIG_
#undef NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
#undef NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
# elif NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION

template<typename T>
void
WeakCallbackInfo<T>::invokeparameter(NAN_WEAK_PARAMETER_CALLBACK_SIG_ data) {
 WeakCallbackInfo<T> *cbinfo = unwrapparameter(data);
 cbinfo->persistent_.Reset();
 cbinfo->callback_(*cbinfo);
 delete cbinfo;
}

template<typename T>
void
WeakCallbackInfo<T>::invoketwofield(NAN_WEAK_TWOFIELD_CALLBACK_SIG_ data) {
 WeakCallbackInfo<T> *cbinfo = unwraptwofield(data);
 cbinfo->persistent_.Reset();
 cbinfo->callback_(*cbinfo);
 delete cbinfo;
}

template<typename T>
WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrapparameter(
 NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_ data) {
 WeakCallbackInfo<T> *cbinfo =
 static_cast<WeakCallbackInfo<T>*>(data.GetParameter());
 cbinfo->isolate_ = data.GetIsolate();
 return cbinfo;
}

template<typename T>
WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwraptwofield(
 NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_ data) {
 WeakCallbackInfo<T> *cbinfo =
 static_cast<WeakCallbackInfo<T>*>(data.GetInternalField1());
 cbinfo->isolate_ = data.GetIsolate();
 return cbinfo;
}

#undef NAN_WEAK_PARAMETER_CALLBACK_SIG_
#undef NAN_WEAK_TWOFIELD_CALLBACK_SIG_
#undef NAN_WEAK_PARAMETER_CALLBACK_DATA_TYPE_
#undef NAN_WEAK_TWOFIELD_CALLBACK_DATA_TYPE_
#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION

template<typename T>
template<typename S>
void WeakCallbackInfo<T>::invoke(NAN_WEAK_CALLBACK_SIG_ data) {
 WeakCallbackInfo<T> *cbinfo = unwrap(data);
 cbinfo->persistent_.Reset();
 cbinfo->callback_(*cbinfo);
 delete cbinfo;
}

template<typename T>
template<typename S>
WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrap(
 NAN_WEAK_CALLBACK_DATA_TYPE_ data) {
 void *parameter = data.GetParameter();
 WeakCallbackInfo<T> *cbinfo =
 static_cast<WeakCallbackInfo<T>*>(parameter);
 cbinfo->isolate_ = data.GetIsolate();
 return cbinfo;
}

#undef NAN_WEAK_CALLBACK_SIG_
#undef NAN_WEAK_CALLBACK_DATA_TYPE_
#else

template<typename T>
void WeakCallbackInfo<T>::invoke(NAN_WEAK_CALLBACK_SIG_ data) {
 WeakCallbackInfo<T> *cbinfo = unwrap(data);
 cbinfo->persistent_.Dispose();
 cbinfo->persistent_.Clear();
 cbinfo->callback_(*cbinfo);
 delete cbinfo;
}

template<typename T>
WeakCallbackInfo<T> *WeakCallbackInfo<T>::unwrap(
 NAN_WEAK_CALLBACK_DATA_TYPE_ data) {
 WeakCallbackInfo<T> *cbinfo =
 static_cast<WeakCallbackInfo<T>*>(data);
 cbinfo->isolate_ = v8::Isolate::GetCurrent();
 return cbinfo;
}

#undef NAN_WEAK_CALLBACK_SIG_
#undef NAN_WEAK_CALLBACK_DATA_TYPE_
#endif

#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 || \
 (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
template<typename T, typename M>
template<typename P>
inline void Persistent<T, M>::SetWeak(
 P *parameter
 , typename WeakCallbackInfo::Callback callback
 , WeakCallbackType type) {
 WeakCallbackInfo *wcbd;
 if (type == WeakCallbackType::kParameter) {
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , parameter);
 v8::PersistentBase<T>::SetWeak(
 wcbd
 , WeakCallbackInfo::template invokeparameter<true>
 , type);
 } else {
 v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
 assert((*self_v)->IsObject());
 v8::Local<v8::Object> self((*self_v).As<v8::Object>());
 int count = self->InternalFieldCount();
 void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
 for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
 internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
 }
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , 0
 , internal_fields[0]
 , internal_fields[1]);
 self->SetAlignedPointerInInternalField(0, wcbd);
 v8::PersistentBase<T>::SetWeak(
 static_cast<WeakCallbackInfo*>(0)
 , WeakCallbackInfo::template invoketwofield<true>
 , type);
 }
}
#elif NODE_MODULE_VERSION > IOJS_1_1_MODULE_VERSION
template<typename T, typename M>
template<typename P>
inline void Persistent<T, M>::SetWeak(
 P *parameter
 , typename WeakCallbackInfo::Callback callback
 , WeakCallbackType type) {
 WeakCallbackInfo *wcbd;
 if (type == WeakCallbackType::kParameter) {
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , parameter);
 v8::PersistentBase<T>::SetPhantom(
 wcbd
 , WeakCallbackInfo::invokeparameter);
 } else {
 v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
 assert((*self_v)->IsObject());
 v8::Local<v8::Object> self((*self_v).As<v8::Object>());
 int count = self->InternalFieldCount();
 void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
 for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
 internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
 }
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , 0
 , internal_fields[0]
 , internal_fields[1]);
 self->SetAlignedPointerInInternalField(0, wcbd);
 v8::PersistentBase<T>::SetPhantom(
 static_cast<WeakCallbackInfo*>(0)
 , WeakCallbackInfo::invoketwofield
 , 0
 , count > 1 ? 1 : kNoInternalFieldIndex);
 }
}
#elif NODE_MODULE_VERSION > NODE_0_12_MODULE_VERSION
template<typename T, typename M>
template<typename P>
inline void Persistent<T, M>::SetWeak(
 P *parameter
 , typename WeakCallbackInfo::Callback callback
 , WeakCallbackType type) {
 WeakCallbackInfo *wcbd;
 if (type == WeakCallbackType::kParameter) {
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , parameter);
 v8::PersistentBase<T>::SetPhantom(
 wcbd
 , WeakCallbackInfo::invokeparameter);
 } else {
 v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
 assert((*self_v)->IsObject());
 v8::Local<v8::Object> self((*self_v).As<v8::Object>());
 int count = self->InternalFieldCount();
 void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
 for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
 internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
 }
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , 0
 , internal_fields[0]
 , internal_fields[1]);
 self->SetAlignedPointerInInternalField(0, wcbd);
 v8::PersistentBase<T>::SetPhantom(
 WeakCallbackInfo::invoketwofield
 , 0
 , count > 1 ? 1 : kNoInternalFieldIndex);
 }
}
#elif NODE_MODULE_VERSION > NODE_0_10_MODULE_VERSION
template<typename T, typename M>
template<typename P>
inline void Persistent<T, M>::SetWeak(
 P *parameter
 , typename WeakCallbackInfo::Callback callback
 , WeakCallbackType type) {
 WeakCallbackInfo *wcbd;
 if (type == WeakCallbackType::kParameter) {
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , parameter);
 v8::PersistentBase<T>::SetWeak(wcbd, WeakCallbackInfo::invoke);
 } else {
 v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
 assert((*self_v)->IsObject());
 v8::Local<v8::Object> self((*self_v).As<v8::Object>());
 int count = self->InternalFieldCount();
 void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
 for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
 internal_fields[i] = self->GetAlignedPointerFromInternalField(i);
 }
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , 0
 , internal_fields[0]
 , internal_fields[1]);
 v8::PersistentBase<T>::SetWeak(wcbd, WeakCallbackInfo::invoke);
 }
}
#else
template<typename T>
template<typename P>
inline void PersistentBase<T>::SetWeak(
 P *parameter
 , typename WeakCallbackInfo::Callback callback
 , WeakCallbackType type) {
 WeakCallbackInfo *wcbd;
 if (type == WeakCallbackType::kParameter) {
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , parameter);
 persistent.MakeWeak(wcbd, WeakCallbackInfo::invoke);
 } else {
 v8::Local<v8::Value>* self_v(reinterpret_cast<v8::Local<v8::Value>*>(this));
 assert((*self_v)->IsObject());
 v8::Local<v8::Object> self((*self_v).As<v8::Object>());
 int count = self->InternalFieldCount();
 void *internal_fields[kInternalFieldsInWeakCallback] = {0, 0};
 for (int i = 0; i < count && i < kInternalFieldsInWeakCallback; i++) {
 internal_fields[i] = self->GetPointerFromInternalField(i);
 }
 wcbd = new WeakCallbackInfo(
 reinterpret_cast<Persistent<v8::Value>*>(this)
 , callback
 , 0
 , internal_fields[0]
 , internal_fields[1]);
 persistent.MakeWeak(wcbd, WeakCallbackInfo::invoke);
 }
}
#endif

#endif  // NAN_WEAK_H_

MR SKB