73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// Copyright (c) 2019 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "shell/common/gin_helper/destroyable.h"
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#include "base/no_destructor.h"
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#include "gin/converter.h"
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#include "shell/common/gin_helper/wrappable_base.h"
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namespace gin_helper {
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namespace {
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v8::Global<v8::FunctionTemplate>* GetDestroyFunc() {
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static base::NoDestructor<v8::Global<v8::FunctionTemplate>> destroy_func;
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return destroy_func.get();
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}
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v8::Global<v8::FunctionTemplate>* GetIsDestroyedFunc() {
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static base::NoDestructor<v8::Global<v8::FunctionTemplate>> is_destroyed_func;
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return is_destroyed_func.get();
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}
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void DestroyFunc(const v8::FunctionCallbackInfo<v8::Value>& info) {
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v8::Local<v8::Object> holder = info.Holder();
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if (Destroyable::IsDestroyed(holder))
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return;
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// TODO(zcbenz): gin_helper::Wrappable will be removed.
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delete static_cast<gin_helper::WrappableBase*>(
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holder->GetAlignedPointerFromInternalField(0));
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holder->SetAlignedPointerInInternalField(0, nullptr);
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}
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void IsDestroyedFunc(const v8::FunctionCallbackInfo<v8::Value>& info) {
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info.GetReturnValue().Set(gin::ConvertToV8(
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info.GetIsolate(), Destroyable::IsDestroyed(info.Holder())));
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}
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} // namespace
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// static
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bool Destroyable::IsDestroyed(v8::Local<v8::Object> object) {
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// An object is considered destroyed if it has no internal pointer or its
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// internal has been destroyed.
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return object->InternalFieldCount() == 0 ||
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object->GetAlignedPointerFromInternalField(0) == nullptr;
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}
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// static
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void Destroyable::MakeDestroyable(v8::Isolate* isolate,
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v8::Local<v8::FunctionTemplate> prototype) {
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// Cache the FunctionTemplate of "destroy" and "isDestroyed".
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if (GetDestroyFunc()->IsEmpty()) {
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auto templ = v8::FunctionTemplate::New(isolate, DestroyFunc);
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templ->RemovePrototype();
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GetDestroyFunc()->Reset(isolate, templ);
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templ = v8::FunctionTemplate::New(isolate, IsDestroyedFunc);
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templ->RemovePrototype();
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GetIsDestroyedFunc()->Reset(isolate, templ);
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}
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auto proto_templ = prototype->PrototypeTemplate();
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proto_templ->Set(
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gin::StringToSymbol(isolate, "destroy"),
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v8::Local<v8::FunctionTemplate>::New(isolate, *GetDestroyFunc()));
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proto_templ->Set(
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gin::StringToSymbol(isolate, "isDestroyed"),
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v8::Local<v8::FunctionTemplate>::New(isolate, *GetIsDestroyedFunc()));
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}
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} // namespace gin_helper
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