node/src/base_object-inl.h at main · nodejs/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 SRC_BASE_OBJECT_INL_H_

#define SRC_BASE_OBJECT_INL_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "base_object.h"

#include "env-inl.h"

#include "util.h"

#include "v8.h"

namespace node {

BaseObject::BaseObject(Environment* env, v8::Local<v8::Object> object)

: BaseObject(env->principal_realm(), object) {

// TODO(legendecas): Check the shorthand is only used in the principal realm

// while allowing to create a BaseObject in a vm context.

}

void BaseObject::Detach() {

CHECK_GT(pointer_data()->strong_ptr_count, 0);

pointer_data()->is_detached = true;

}

v8::Global<v8::Object>& BaseObject::persistent() {

return persistent_handle_;

}

v8::Local<v8::Object> BaseObject::object() const {

return PersistentToLocal::Default(env()->isolate(), persistent_handle_);

}

v8::Local<v8::Object> BaseObject::object(v8::Isolate* isolate) const {

v8::Local<v8::Object> handle = object();

DCHECK_EQ(env()->isolate(), isolate);

return handle;

}

Environment* BaseObject::env() const {

return realm_->env();

}

Realm* BaseObject::realm() const {

return realm_;

}

bool BaseObject::IsBaseObject(IsolateData* isolate_data,

v8::Local<v8::Object> obj) {

if (obj->InternalFieldCount() < BaseObject::kInternalFieldCount) {

return false;

}

uint16_t* ptr =

static_cast<uint16_t*>(obj->GetAlignedPointerFromInternalField(

BaseObject::kEmbedderType, EmbedderDataTag::kEmbedderType));

return ptr == isolate_data->embedder_id_for_non_cppgc();

}

void BaseObject::TagBaseObject(IsolateData* isolate_data,

v8::Local<v8::Object> object) {

DCHECK_GE(object->InternalFieldCount(), BaseObject::kInternalFieldCount);

object->SetAlignedPointerInInternalField(

BaseObject::kEmbedderType,

isolate_data->embedder_id_for_non_cppgc(),

EmbedderDataTag::kEmbedderType);

}

void BaseObject::SetInternalFields(IsolateData* isolate_data,

v8::Local<v8::Object> object,

void* slot) {

TagBaseObject(isolate_data, object);

object->SetAlignedPointerInInternalField(

BaseObject::kSlot, slot, EmbedderDataTag::kDefault);

}

BaseObject* BaseObject::FromJSObject(v8::Local<v8::Value> value) {

v8::Local<v8::Object> obj = value.As<v8::Object>();

DCHECK_GE(obj->InternalFieldCount(), BaseObject::kInternalFieldCount);

return static_cast<BaseObject*>(obj->GetAlignedPointerFromInternalField(

BaseObject::kSlot, EmbedderDataTag::kDefault));

}

template <typename T>

T* BaseObject::FromJSObject(v8::Local<v8::Value> object) {

return static_cast<T*>(FromJSObject(object));

}

void BaseObject::OnGCCollect() {

delete this;

}

void BaseObject::ClearWeak() {

if (has_pointer_data())

pointer_data()->wants_weak_jsobj = false;

persistent_handle_.ClearWeak();

}

bool BaseObject::IsWeakOrDetached() const {

if (persistent_handle_.IsWeak()) return true;

if (!has_pointer_data()) return false;

const PointerData* pd = const_cast<BaseObject*>(this)->pointer_data();

return pd->wants_weak_jsobj || pd->is_detached;

}

template <int Field>

void BaseObject::InternalFieldGet(

const v8::FunctionCallbackInfo<v8::Value>& args) {

args.GetReturnValue().Set(

args.This()->GetInternalField(Field).As<v8::Value>());

}

template <int Field, bool (v8::Value::*typecheck)() const>

void BaseObject::InternalFieldSet(

const v8::FunctionCallbackInfo<v8::Value>& args) {

v8::Local<v8::Value> value = args[0];

// This could be e.g. value->IsFunction().

CHECK(((*value)->*typecheck)());

args.This()->SetInternalField(Field, value);

}

bool BaseObject::has_pointer_data() const {

return pointer_data_ != nullptr;

}

template <typename T, bool kIsWeak>

BaseObject::PointerData*

BaseObjectPtrImpl<T, kIsWeak>::pointer_data() const {

if constexpr (kIsWeak) {

return data_.pointer_data;

}

if (get_base_object() == nullptr) {

return nullptr;

}

return get_base_object()->pointer_data();

}

template <typename T, bool kIsWeak>

BaseObject* BaseObjectPtrImpl<T, kIsWeak>::get_base_object() const {

if constexpr (kIsWeak) {

if (pointer_data() == nullptr) {

return nullptr;

}

return pointer_data()->self;

}

return data_.target;

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::~BaseObjectPtrImpl() {

if constexpr (kIsWeak) {

if (pointer_data() != nullptr &&

--pointer_data()->weak_ptr_count == 0 &&

pointer_data()->self == nullptr) {

delete pointer_data();

}

} else if (get() != nullptr) {

get()->decrease_refcount();

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl() {

data_.target = nullptr;

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(T* target)

: BaseObjectPtrImpl() {

if (target == nullptr) return;

if constexpr (kIsWeak) {

data_.pointer_data = target->pointer_data();

CHECK_NOT_NULL(pointer_data());

pointer_data()->weak_ptr_count++;

} else {

data_.target = target;

CHECK_NOT_NULL(pointer_data());

get()->increase_refcount();

}

template <typename T, bool kIsWeak>

template <typename U, bool kW>

BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(

const BaseObjectPtrImpl<U, kW>& other)

: BaseObjectPtrImpl(other.get()) {}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(const BaseObjectPtrImpl& other)

: BaseObjectPtrImpl(other.get()) {}

template <typename T, bool kIsWeak>

template <typename U, bool kW>

BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(

const BaseObjectPtrImpl<U, kW>& other) {

if (other.get() == get()) return *this;

this->~BaseObjectPtrImpl();

return *new (this) BaseObjectPtrImpl(other);

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(

const BaseObjectPtrImpl& other) {

if (other.get() == get()) return *this;

this->~BaseObjectPtrImpl();

return *new (this) BaseObjectPtrImpl(other);

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(BaseObjectPtrImpl&& other)

: data_(other.data_) {

if constexpr (kIsWeak)

other.data_.target = nullptr;

else

other.data_.pointer_data = nullptr;

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(

BaseObjectPtrImpl&& other) {

if (&other == this) return *this;

this->~BaseObjectPtrImpl();

return *new (this) BaseObjectPtrImpl(std::move(other));

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(std::nullptr_t)

: BaseObjectPtrImpl() {}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(

std::nullptr_t) {

this->~BaseObjectPtrImpl();

return *new (this) BaseObjectPtrImpl();

}

template <typename T, bool kIsWeak>

void BaseObjectPtrImpl<T, kIsWeak>::reset(T* ptr) {

*this = BaseObjectPtrImpl(ptr);

}

template <typename T, bool kIsWeak>

T* BaseObjectPtrImpl<T, kIsWeak>::get() const {

return static_cast<T*>(get_base_object());

}

template <typename T, bool kIsWeak>

T& BaseObjectPtrImpl<T, kIsWeak>::operator*() const {

return *get();

}

template <typename T, bool kIsWeak>

T* BaseObjectPtrImpl<T, kIsWeak>::operator->() const {

return get();

}

template <typename T, bool kIsWeak>

BaseObjectPtrImpl<T, kIsWeak>::operator bool() const {

return get() != nullptr;

}

template <typename T, bool kIsWeak>

template <typename U, bool kW>

bool BaseObjectPtrImpl<T, kIsWeak>::operator ==(

const BaseObjectPtrImpl<U, kW>& other) const {

return get() == other.get();

}

template <typename T, bool kIsWeak>

template <typename U, bool kW>

bool BaseObjectPtrImpl<T, kIsWeak>::operator !=(

const BaseObjectPtrImpl<U, kW>& other) const {

return get() != other.get();

}

template <typename T, bool kIsWeak>

bool operator==(const BaseObjectPtrImpl<T, kIsWeak> ptr, const std::nullptr_t) {

return ptr.get() == nullptr;

}

template <typename T, bool kIsWeak>

bool operator==(const std::nullptr_t, const BaseObjectPtrImpl<T, kIsWeak> ptr) {

return ptr.get() == nullptr;

}

template <typename T, typename... Args>

BaseObjectPtr<T> MakeBaseObject(Args&&... args) {

return BaseObjectPtr<T>(new T(std::forward<Args>(args)...));

}

template <typename T, typename... Args>

BaseObjectWeakPtr<T> MakeWeakBaseObject(Args&&... args) {

T* target = new T(std::forward<Args>(args)...);

target->MakeWeak();

return BaseObjectWeakPtr<T>(target);

}

template <typename T, typename... Args>

BaseObjectPtr<T> MakeDetachedBaseObject(Args&&... args) {

BaseObjectPtr<T> target = MakeBaseObject<T>(std::forward<Args>(args)...);

target->Detach();

return target;

}

} // namespace node

#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif // SRC_BASE_OBJECT_INL_H_

node/src/base_object-inl.h at main · nodejs/node · GitHub

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