GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: base_object-inl.h Lines: 165 172 95.9 %
Date: 2021-09-19 04:12:45 Branches: 65 92 70.7 %

Line Branch Exec Source
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SRC_BASE_OBJECT_INL_H_
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#define SRC_BASE_OBJECT_INL_H_
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
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#include "base_object.h"
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#include "env-inl.h"
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#include "util.h"
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#include "v8.h"
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namespace node {
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BaseObject::BaseObject(Environment* env, v8::Local<v8::Object> object)
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    : persistent_handle_(env->isolate(), object), env_(env) {
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  CHECK_EQ(false, object.IsEmpty());
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  CHECK_GT(object->InternalFieldCount(), 0);
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  object->SetAlignedPointerInInternalField(
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      BaseObject::kSlot,
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      static_cast<void*>(this));
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  env->AddCleanupHook(DeleteMe, static_cast<void*>(this));
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  env->modify_base_object_count(1);
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}
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BaseObject::~BaseObject() {
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  env()->modify_base_object_count(-1);
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  env()->RemoveCleanupHook(DeleteMe, static_cast<void*>(this));
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  if (UNLIKELY(has_pointer_data())) {
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    PointerData* metadata = pointer_data();
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    CHECK_EQ(metadata->strong_ptr_count, 0);
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    metadata->self = nullptr;
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    if (metadata->weak_ptr_count == 0)
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      delete metadata;
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  }
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  if (persistent_handle_.IsEmpty()) {
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    // This most likely happened because the weak callback below cleared it.
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    return;
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  }
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  {
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    v8::HandleScope handle_scope(env()->isolate());
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    object()->SetAlignedPointerInInternalField(BaseObject::kSlot, nullptr);
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  }
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}
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void BaseObject::Detach() {
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  CHECK_GT(pointer_data()->strong_ptr_count, 0);
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  pointer_data()->is_detached = true;
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}
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v8::Global<v8::Object>& BaseObject::persistent() {
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  return persistent_handle_;
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}
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v8::Local<v8::Object> BaseObject::object() const {
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  return PersistentToLocal::Default(env()->isolate(), persistent_handle_);
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}
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v8::Local<v8::Object> BaseObject::object(v8::Isolate* isolate) const {
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  v8::Local<v8::Object> handle = object();
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  DCHECK_EQ(handle->GetCreationContext().ToLocalChecked()->GetIsolate(),
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            isolate);
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  DCHECK_EQ(env()->isolate(), isolate);
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  return handle;
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}
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Environment* BaseObject::env() const {
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  return env_;
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}
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BaseObject* BaseObject::FromJSObject(v8::Local<v8::Value> value) {
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  v8::Local<v8::Object> obj = value.As<v8::Object>();
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  DCHECK_GE(obj->InternalFieldCount(), BaseObject::kSlot);
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  return static_cast<BaseObject*>(
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      obj->GetAlignedPointerFromInternalField(BaseObject::kSlot));
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}
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template <typename T>
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T* BaseObject::FromJSObject(v8::Local<v8::Value> object) {
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  return static_cast<T*>(FromJSObject(object));
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}
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void BaseObject::MakeWeak() {
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  if (has_pointer_data()) {
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    pointer_data()->wants_weak_jsobj = true;
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    if (pointer_data()->strong_ptr_count > 0) return;
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  }
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  persistent_handle_.SetWeak(
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      this,
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      [](const v8::WeakCallbackInfo<BaseObject>& data) {
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        BaseObject* obj = data.GetParameter();
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        // Clear the persistent handle so that ~BaseObject() doesn't attempt
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        // to mess with internal fields, since the JS object may have
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        // transitioned into an invalid state.
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        // Refs: https://github.com/nodejs/node/issues/18897
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        obj->persistent_handle_.Reset();
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        CHECK_IMPLIES(obj->has_pointer_data(),
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                      obj->pointer_data()->strong_ptr_count == 0);
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        obj->OnGCCollect();
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      }, v8::WeakCallbackType::kParameter);
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}
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void BaseObject::OnGCCollect() {
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  delete this;
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}
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void BaseObject::ClearWeak() {
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  if (has_pointer_data())
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    pointer_data()->wants_weak_jsobj = false;
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  persistent_handle_.ClearWeak();
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}
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bool BaseObject::IsWeakOrDetached() const {
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  if (persistent_handle_.IsWeak()) return true;
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  if (!has_pointer_data()) return false;
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  const PointerData* pd = const_cast<BaseObject*>(this)->pointer_data();
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  return pd->wants_weak_jsobj || pd->is_detached;
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}
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void BaseObject::LazilyInitializedJSTemplateConstructor(
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    const v8::FunctionCallbackInfo<v8::Value>& args) {
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  DCHECK(args.IsConstructCall());
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  DCHECK_GT(args.This()->InternalFieldCount(), 0);
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  args.This()->SetAlignedPointerInInternalField(BaseObject::kSlot, nullptr);
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}
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v8::Local<v8::FunctionTemplate>
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BaseObject::MakeLazilyInitializedJSTemplate(Environment* env) {
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  v8::Local<v8::FunctionTemplate> t =
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      env->NewFunctionTemplate(LazilyInitializedJSTemplateConstructor);
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  t->Inherit(BaseObject::GetConstructorTemplate(env));
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  t->InstanceTemplate()->SetInternalFieldCount(
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      BaseObject::kInternalFieldCount);
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  return t;
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}
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template <int Field>
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void BaseObject::InternalFieldGet(
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    v8::Local<v8::String> property,
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    const v8::PropertyCallbackInfo<v8::Value>& info) {
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  info.GetReturnValue().Set(info.This()->GetInternalField(Field));
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}
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template <int Field, bool (v8::Value::* typecheck)() const>
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void BaseObject::InternalFieldSet(v8::Local<v8::String> property,
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                                  v8::Local<v8::Value> value,
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                                  const v8::PropertyCallbackInfo<void>& info) {
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  // This could be e.g. value->IsFunction().
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  CHECK(((*value)->*typecheck)());
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  info.This()->SetInternalField(Field, value);
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}
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bool BaseObject::has_pointer_data() const {
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  return pointer_data_ != nullptr;
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}
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BaseObject::PointerData* BaseObject::pointer_data() {
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  if (!has_pointer_data()) {
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    PointerData* metadata = new PointerData();
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    metadata->wants_weak_jsobj = persistent_handle_.IsWeak();
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    metadata->self = this;
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    pointer_data_ = metadata;
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  }
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  CHECK(has_pointer_data());
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  return pointer_data_;
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}
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void BaseObject::decrease_refcount() {
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  CHECK(has_pointer_data());
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  PointerData* metadata = pointer_data();
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  CHECK_GT(metadata->strong_ptr_count, 0);
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  unsigned int new_refcount = --metadata->strong_ptr_count;
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  if (new_refcount == 0) {
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    if (metadata->is_detached) {
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      OnGCCollect();
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    } else if (metadata->wants_weak_jsobj && !persistent_handle_.IsEmpty()) {
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      MakeWeak();
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    }
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  }
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}
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void BaseObject::increase_refcount() {
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  unsigned int prev_refcount = pointer_data()->strong_ptr_count++;
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  if (prev_refcount == 0 && !persistent_handle_.IsEmpty())
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    persistent_handle_.ClearWeak();
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}
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template <typename T, bool kIsWeak>
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BaseObject::PointerData*
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BaseObjectPtrImpl<T, kIsWeak>::pointer_data() const {
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  if (kIsWeak) {
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    return data_.pointer_data;
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  }
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  if (get_base_object() == nullptr) {
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    return nullptr;
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  }
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  return get_base_object()->pointer_data();
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}
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template <typename T, bool kIsWeak>
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BaseObject* BaseObjectPtrImpl<T, kIsWeak>::get_base_object() const {
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  if (kIsWeak) {
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    if (pointer_data() == nullptr) {
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      return nullptr;
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    }
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    return pointer_data()->self;
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  }
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  return data_.target;
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>::~BaseObjectPtrImpl() {
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  if (kIsWeak) {
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    if (pointer_data() != nullptr &&
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        --pointer_data()->weak_ptr_count == 0 &&
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        pointer_data()->self == nullptr) {
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      delete pointer_data();
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    }
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  } else if (get() != nullptr) {
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    get()->decrease_refcount();
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  }
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl() {
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  data_.target = nullptr;
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(T* target)
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  : BaseObjectPtrImpl() {
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  if (target == nullptr) return;
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  if (kIsWeak) {
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    data_.pointer_data = target->pointer_data();
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    CHECK_NOT_NULL(pointer_data());
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    pointer_data()->weak_ptr_count++;
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  } else {
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    data_.target = target;
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    CHECK_NOT_NULL(pointer_data());
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    get()->increase_refcount();
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  }
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}
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template <typename T, bool kIsWeak>
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template <typename U, bool kW>
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BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(
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    const BaseObjectPtrImpl<U, kW>& other)
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  : BaseObjectPtrImpl(other.get()) {}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(const BaseObjectPtrImpl& other)
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  : BaseObjectPtrImpl(other.get()) {}
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template <typename T, bool kIsWeak>
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template <typename U, bool kW>
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BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(
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    const BaseObjectPtrImpl<U, kW>& other) {
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  if (other.get() == get()) return *this;
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  this->~BaseObjectPtrImpl();
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  return *new (this) BaseObjectPtrImpl(other);
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(
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    const BaseObjectPtrImpl& other) {
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  if (other.get() == get()) return *this;
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  this->~BaseObjectPtrImpl();
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  return *new (this) BaseObjectPtrImpl(other);
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>::BaseObjectPtrImpl(BaseObjectPtrImpl&& other)
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  : data_(other.data_) {
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  if (kIsWeak)
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    other.data_.target = nullptr;
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  else
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    other.data_.pointer_data = nullptr;
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>& BaseObjectPtrImpl<T, kIsWeak>::operator=(
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    BaseObjectPtrImpl&& other) {
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  if (&other == this) return *this;
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  this->~BaseObjectPtrImpl();
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  return *new (this) BaseObjectPtrImpl(std::move(other));
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}
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template <typename T, bool kIsWeak>
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void BaseObjectPtrImpl<T, kIsWeak>::reset(T* ptr) {
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  *this = BaseObjectPtrImpl(ptr);
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}
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template <typename T, bool kIsWeak>
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T* BaseObjectPtrImpl<T, kIsWeak>::get() const {
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  return static_cast<T*>(get_base_object());
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}
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template <typename T, bool kIsWeak>
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T& BaseObjectPtrImpl<T, kIsWeak>::operator*() const {
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  return *get();
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}
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template <typename T, bool kIsWeak>
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T* BaseObjectPtrImpl<T, kIsWeak>::operator->() const {
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  return get();
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}
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template <typename T, bool kIsWeak>
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BaseObjectPtrImpl<T, kIsWeak>::operator bool() const {
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  return get() != nullptr;
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}
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template <typename T, bool kIsWeak>
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template <typename U, bool kW>
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10975
bool BaseObjectPtrImpl<T, kIsWeak>::operator ==(
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    const BaseObjectPtrImpl<U, kW>& other) const {
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  return get() == other.get();
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}
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template <typename T, bool kIsWeak>
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template <typename U, bool kW>
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bool BaseObjectPtrImpl<T, kIsWeak>::operator !=(
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    const BaseObjectPtrImpl<U, kW>& other) const {
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  return get() != other.get();
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}
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template <typename T, typename... Args>
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BaseObjectPtr<T> MakeBaseObject(Args&&... args) {
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  return BaseObjectPtr<T>(new T(std::forward<Args>(args)...));
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}
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template <typename T, typename... Args>
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BaseObjectPtr<T> MakeDetachedBaseObject(Args&&... args) {
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  BaseObjectPtr<T> target = MakeBaseObject<T>(std::forward<Args>(args)...);
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  target->Detach();
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  return target;
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}
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}  // namespace node
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#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
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#endif  // SRC_BASE_OBJECT_INL_H_