node/src/base_object.cc at master · himself65/node · GitHub

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#include "base_object.h"

#include "env-inl.h"

#include "node_messaging.h"

#include "node_realm-inl.h"

namespace node {

using v8::Context;

using v8::FunctionCallbackInfo;

using v8::FunctionTemplate;

using v8::HandleScope;

using v8::Just;

using v8::Local;

using v8::Maybe;

using v8::Object;

using v8::Value;

using v8::ValueDeserializer;

using v8::WeakCallbackInfo;

using v8::WeakCallbackType;

BaseObject::BaseObject(Realm* realm, Local<Object> object)

: persistent_handle_(realm->isolate(), object), realm_(realm) {

CHECK_EQ(false, object.IsEmpty());

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

SetInternalFields(realm->isolate_data(), object, static_cast<void*>(this));

realm->AddCleanupHook(DeleteMe, static_cast<void*>(this));

realm->modify_base_object_count(1);

}

BaseObject::~BaseObject() {

realm()->modify_base_object_count(-1);

realm()->RemoveCleanupHook(DeleteMe, static_cast<void*>(this));

if (UNLIKELY(has_pointer_data())) {

PointerData* metadata = pointer_data();

CHECK_EQ(metadata->strong_ptr_count, 0);

metadata->self = nullptr;

if (metadata->weak_ptr_count == 0) delete metadata;

}

if (persistent_handle_.IsEmpty()) {

// This most likely happened because the weak callback below cleared it.

return;

}

{

HandleScope handle_scope(realm()->isolate());

object()->SetAlignedPointerInInternalField(BaseObject::kSlot, nullptr);

}

void BaseObject::MakeWeak() {

if (has_pointer_data()) {

pointer_data()->wants_weak_jsobj = true;

if (pointer_data()->strong_ptr_count > 0) return;

}

persistent_handle_.SetWeak(

this,

[](const WeakCallbackInfo<BaseObject>& data) {

BaseObject* obj = data.GetParameter();

// Clear the persistent handle so that ~BaseObject() doesn't attempt

// to mess with internal fields, since the JS object may have

// transitioned into an invalid state.

// Refs: https://github.com/nodejs/node/issues/18897

obj->persistent_handle_.Reset();

CHECK_IMPLIES(obj->has_pointer_data(),

obj->pointer_data()->strong_ptr_count == 0);

obj->OnGCCollect();

WeakCallbackType::kParameter);

}

void BaseObject::LazilyInitializedJSTemplateConstructor(

const FunctionCallbackInfo<Value>& args) {

DCHECK(args.IsConstructCall());

CHECK_GE(args.This()->InternalFieldCount(), BaseObject::kInternalFieldCount);

Environment* env = Environment::GetCurrent(args);

DCHECK_NOT_NULL(env);

SetInternalFields(env->isolate_data(), args.This(), nullptr);

}

Local<FunctionTemplate> BaseObject::MakeLazilyInitializedJSTemplate(

Environment* env) {

return MakeLazilyInitializedJSTemplate(env->isolate_data());

}

Local<FunctionTemplate> BaseObject::MakeLazilyInitializedJSTemplate(

IsolateData* isolate_data) {

Local<FunctionTemplate> t = NewFunctionTemplate(

isolate_data->isolate(), LazilyInitializedJSTemplateConstructor);

t->InstanceTemplate()->SetInternalFieldCount(BaseObject::kInternalFieldCount);

return t;

}

BaseObject::TransferMode BaseObject::GetTransferMode() const {

return TransferMode::kDisallowCloneAndTransfer;

}

std::unique_ptr<worker::TransferData> BaseObject::TransferForMessaging() {

return {};

}

std::unique_ptr<worker::TransferData> BaseObject::CloneForMessaging() const {

return {};

}

Maybe<std::vector<BaseObjectPtr<BaseObject>>> BaseObject::NestedTransferables()

const {

return Just(std::vector<BaseObjectPtr<BaseObject>>{});

}

Maybe<bool> BaseObject::FinalizeTransferRead(Local<Context> context,

ValueDeserializer* deserializer) {

return Just(true);

}

BaseObject::PointerData* BaseObject::pointer_data() {

if (!has_pointer_data()) {

PointerData* metadata = new PointerData();

metadata->wants_weak_jsobj = persistent_handle_.IsWeak();

metadata->self = this;

pointer_data_ = metadata;

}

CHECK(has_pointer_data());

return pointer_data_;

}

void BaseObject::decrease_refcount() {

CHECK(has_pointer_data());

PointerData* metadata = pointer_data();

CHECK_GT(metadata->strong_ptr_count, 0);

unsigned int new_refcount = --metadata->strong_ptr_count;

if (new_refcount == 0) {

if (metadata->is_detached) {

OnGCCollect();

} else if (metadata->wants_weak_jsobj && !persistent_handle_.IsEmpty()) {

MakeWeak();

}

void BaseObject::increase_refcount() {

unsigned int prev_refcount = pointer_data()->strong_ptr_count++;

if (prev_refcount == 0 && !persistent_handle_.IsEmpty())

persistent_handle_.ClearWeak();

}

void BaseObject::DeleteMe(void* data) {

BaseObject* self = static_cast<BaseObject*>(data);

if (self->has_pointer_data() && self->pointer_data()->strong_ptr_count > 0) {

return self->Detach();

}

delete self;

}

bool BaseObject::IsDoneInitializing() const {

return true;

}

Local<Object> BaseObject::WrappedObject() const {

return object();

}

bool BaseObject::IsRootNode() const {

return !persistent_handle_.IsWeak();

}

bool BaseObject::IsNotIndicativeOfMemoryLeakAtExit() const {

return IsWeakOrDetached();

}

} // namespace node

node/src/base_object.cc at master · himself65/node · GitHub

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