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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) : persistent_handle_(env->isolate(), object), env_(env) { CHECK_EQ(false, object.IsEmpty()); CHECK_GT(object->InternalFieldCount(), 0); object->SetAlignedPointerInInternalField(0, static_cast<void*>(this)); env_->AddCleanupHook(DeleteMe, static_cast<void*>(this)); } BaseObject::~BaseObject() { RemoveCleanupHook(); if (persistent_handle_.IsEmpty()) { // This most likely happened because the weak callback below cleared it. return; } { v8::HandleScope handle_scope(env_->isolate()); object()->SetAlignedPointerInInternalField(0, nullptr); } } void BaseObject::RemoveCleanupHook() { env_->RemoveCleanupHook(DeleteMe, static_cast<void*>(this)); } 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(handle->CreationContext()->GetIsolate(), isolate); DCHECK_EQ(env_->isolate(), isolate); return handle; } Environment* BaseObject::env() const { return env_; } BaseObject* BaseObject::FromJSObject(v8::Local<v8::Object> obj) { CHECK_GT(obj->InternalFieldCount(), 0); return static_cast<BaseObject*>(obj->GetAlignedPointerFromInternalField(0)); } template <typename T> T* BaseObject::FromJSObject(v8::Local<v8::Object> object) { return static_cast<T*>(FromJSObject(object)); } void BaseObject::MakeWeak() { persistent_handle_.SetWeak( this, [](const v8::WeakCallbackInfo<BaseObject>& data) { std::unique_ptr<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(); }, v8::WeakCallbackType::kParameter); } void BaseObject::ClearWeak() { persistent_handle_.ClearWeak(); } v8::Local<v8::FunctionTemplate> BaseObject::MakeLazilyInitializedJSTemplate(Environment* env) { auto constructor = [](const v8::FunctionCallbackInfo<v8::Value>& args) { DCHECK(args.IsConstructCall()); DCHECK_GT(args.This()->InternalFieldCount(), 0); args.This()->SetAlignedPointerInInternalField(0, nullptr); }; v8::Local<v8::FunctionTemplate> t = env->NewFunctionTemplate(constructor); t->InstanceTemplate()->SetInternalFieldCount(1); return t; } template <int Field> void BaseObject::InternalFieldGet( v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& info) { info.GetReturnValue().Set(info.This()->GetInternalField(Field)); } template <int Field, bool (v8::Value::* typecheck)() const> void BaseObject::InternalFieldSet(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info) { // This could be e.g. value->IsFunction(). CHECK(((*value)->*typecheck)()); info.This()->SetInternalField(Field, value); } } // namespace node #endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS #endif // SRC_BASE_OBJECT_INL_H_