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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "gin/wrappable.h"
- #include "base/check_op.h"
- #include "gin/object_template_builder.h"
- #include "gin/per_isolate_data.h"
- namespace gin {
- WrappableBase::WrappableBase() = default;
- WrappableBase::~WrappableBase() {
- wrapper_.Reset();
- }
- ObjectTemplateBuilder WrappableBase::GetObjectTemplateBuilder(
- v8::Isolate* isolate) {
- return ObjectTemplateBuilder(isolate, GetTypeName());
- }
- const char* WrappableBase::GetTypeName() {
- return nullptr;
- }
- void WrappableBase::FirstWeakCallback(
- const v8::WeakCallbackInfo<WrappableBase>& data) {
- WrappableBase* wrappable = data.GetParameter();
- wrappable->dead_ = true;
- wrappable->wrapper_.Reset();
- data.SetSecondPassCallback(SecondWeakCallback);
- }
- void WrappableBase::SecondWeakCallback(
- const v8::WeakCallbackInfo<WrappableBase>& data) {
- WrappableBase* wrappable = data.GetParameter();
- delete wrappable;
- }
- v8::MaybeLocal<v8::Object> WrappableBase::GetWrapperImpl(v8::Isolate* isolate,
- WrapperInfo* info) {
- if (!wrapper_.IsEmpty()) {
- return v8::MaybeLocal<v8::Object>(
- v8::Local<v8::Object>::New(isolate, wrapper_));
- }
- if (dead_)
- return v8::MaybeLocal<v8::Object>();
- PerIsolateData* data = PerIsolateData::From(isolate);
- v8::Local<v8::ObjectTemplate> templ = data->GetObjectTemplate(info);
- if (templ.IsEmpty()) {
- templ = GetObjectTemplateBuilder(isolate).Build();
- CHECK(!templ.IsEmpty());
- data->SetObjectTemplate(info, templ);
- }
- CHECK_EQ(kNumberOfInternalFields, templ->InternalFieldCount());
- v8::Local<v8::Object> wrapper;
- // |wrapper| may be empty in some extreme cases, e.g., when
- // Object.prototype.constructor is overwritten.
- if (!templ->NewInstance(isolate->GetCurrentContext()).ToLocal(&wrapper)) {
- // The current wrappable object will be no longer managed by V8. Delete this
- // now.
- delete this;
- return v8::MaybeLocal<v8::Object>(wrapper);
- }
- int indices[] = {kWrapperInfoIndex, kEncodedValueIndex};
- void* values[] = {info, this};
- wrapper->SetAlignedPointerInInternalFields(2, indices, values);
- wrapper_.Reset(isolate, wrapper);
- wrapper_.SetWeak(this, FirstWeakCallback, v8::WeakCallbackType::kParameter);
- return v8::MaybeLocal<v8::Object>(wrapper);
- }
- namespace internal {
- void* FromV8Impl(v8::Isolate* isolate, v8::Local<v8::Value> val,
- WrapperInfo* wrapper_info) {
- if (!val->IsObject())
- return NULL;
- v8::Local<v8::Object> obj = v8::Local<v8::Object>::Cast(val);
- WrapperInfo* info = WrapperInfo::From(obj);
- // If this fails, the object is not managed by Gin. It is either a normal JS
- // object that's not wrapping any external C++ object, or it is wrapping some
- // C++ object, but that object isn't managed by Gin (maybe Blink).
- if (!info)
- return NULL;
- // If this fails, the object is managed by Gin, but it's not wrapping an
- // instance of the C++ class associated with wrapper_info.
- if (info != wrapper_info)
- return NULL;
- return obj->GetAlignedPointerFromInternalField(kEncodedValueIndex);
- }
- } // namespace internal
- } // namespace gin
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