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// Copyright 2013 The Chromium Authors
// 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"
#include "v8/include/cppgc/visitor.h"
#include "v8/include/v8-cppgc.h"
#include "v8/include/v8-sandbox.h"
namespace gin {
ObjectTemplateBuilder WrappableBase::GetObjectTemplateBuilder(
v8::Isolate* isolate) {
return ObjectTemplateBuilder(isolate, GetHumanReadableName());
}
void WrappableBase::AssociateWithWrapper(v8::Isolate* isolate,
v8::Local<v8::Object> wrapper) {
const WrapperInfo* info = wrapper_info();
v8::Object::Wrap(isolate, wrapper, this,
static_cast<v8::CppHeapPointerTag>(info->pointer_tag));
wrapper_.Reset(isolate, wrapper);
}
NamedPropertyInterceptor* WrappableBase::GetNamedPropertyInterceptor() {
return nullptr;
}
void WrappableBase::Trace(cppgc::Visitor* visitor) const {
visitor->Trace(wrapper_);
}
const v8::Object::WrapperTypeInfo* WrappableBase::GetWrapperTypeInfo() const {
return wrapper_info();
}
v8::MaybeLocal<v8::Object> WrappableBase::GetWrapper(v8::Isolate* isolate) {
if (!wrapper_.IsEmpty()) {
return wrapper_.Get(isolate);
}
const WrapperInfo* info = wrapper_info();
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)) {
return {};
}
// TODO(345640553): Delete the internal fields once DeprecatedWrappable does
// not exist anymore.
wrapper->SetAlignedPointerInInternalField(kWrapperInfoIndex, nullptr,
kDeprecatedData);
wrapper->SetAlignedPointerInInternalField(kEncodedValueIndex, nullptr,
kDeprecatedData);
AssociateWithWrapper(isolate, wrapper);
return wrapper;
}
void WrappableBase::SetWrapper(v8::Isolate* isolate,
v8::Local<v8::Object> wrapper) {
CHECK(wrapper_.IsEmpty());
AssociateWithWrapper(isolate, wrapper);
}
DeprecatedWrappableBase::DeprecatedWrappableBase() = default;
DeprecatedWrappableBase::~DeprecatedWrappableBase() {
wrapper_.Reset();
}
ObjectTemplateBuilder DeprecatedWrappableBase::GetObjectTemplateBuilder(
v8::Isolate* isolate) {
return ObjectTemplateBuilder(isolate, GetTypeName());
}
const char* DeprecatedWrappableBase::GetTypeName() {
return nullptr;
}
void DeprecatedWrappableBase::FirstWeakCallback(
const v8::WeakCallbackInfo<DeprecatedWrappableBase>& data) {
DeprecatedWrappableBase* wrappable = data.GetParameter();
wrappable->dead_ = true;
wrappable->wrapper_.Reset();
data.SetSecondPassCallback(SecondWeakCallback);
}
void DeprecatedWrappableBase::SecondWeakCallback(
const v8::WeakCallbackInfo<DeprecatedWrappableBase>& data) {
DeprecatedWrappableBase* wrappable = data.GetParameter();
delete wrappable;
}
v8::MaybeLocal<v8::Object> DeprecatedWrappableBase::GetWrapperImpl(
v8::Isolate* isolate,
DeprecatedWrapperInfo* 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->DeprecatedGetObjectTemplate(info);
if (templ.IsEmpty()) {
templ = GetObjectTemplateBuilder(isolate).Build();
CHECK(!templ.IsEmpty());
data->DeprecatedSetObjectTemplate(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);
}
wrapper->SetAlignedPointerInInternalField(kWrapperInfoIndex, info,
kDeprecatedData);
wrapper->SetAlignedPointerInInternalField(kEncodedValueIndex, this,
kDeprecatedData);
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,
DeprecatedWrapperInfo* wrapper_info) {
if (!val->IsObject()) {
return nullptr;
}
v8::Local<v8::Object> obj = v8::Local<v8::Object>::Cast(val);
DeprecatedWrapperInfo* info = DeprecatedWrapperInfo::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 nullptr;
}
// 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 nullptr;
}
return obj->GetAlignedPointerFromInternalField(kEncodedValueIndex,
kDeprecatedData);
}
} // namespace internal
} // namespace gin
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