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#ifndef Common_h
#define Common_h
#include <type_traits>
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdocumentation"
#include "v8.h"
// FIXME: Move these to a secondary header?
#include "v8-cppgc.h"
#include "cppgc/allocation.h"
#include "cppgc/type-traits.h"
#pragma clang diagnostic pop
#include <iostream>
namespace tns {
// FIXME(caitp): Move me to a new file
static constexpr uint32_t kExternalDataHeader = 0x45585400;
enum class ExternalDataType {
ClassBuilder,
};
class ExternalData {
public:
ExternalData(ExternalDataType type)
: header(kExternalDataHeader)
, type_(type) {}
virtual ~ExternalData() = default;
bool IsExternalData() const { return header == kExternalDataHeader; }
bool IsClassBuilderData() const { assert(IsExternalData()); return type_ == ExternalDataType::ClassBuilder; }
private:
uint32_t header;
ExternalDataType type_;
};
#define ALLOCATION_HANDLE_FOR_ISOLATE(isolate) (isolate->GetCppHeap()->GetAllocationHandle())
template <typename T>
struct HasClassNameMethod {
private:
template <typename U>
static auto test(int) -> decltype(U::ClassName(), std::true_type{});
template <typename U>
static std::false_type test(...);
public:
static constexpr bool value = decltype(test<T>(0))::value;
};
template <typename T>
typename std::enable_if<HasClassNameMethod<T>::value, const char*>::type
InvokeClassName() {
return T::ClassName();
}
template <typename T>
typename std::enable_if<!HasClassNameMethod<T>::value, const char*>::type
InvokeClassName() {
return "Unknown";
}
template <typename T, typename... Args>
T* MakeGarbageCollected(v8::Isolate* isolate, Args&&... args) {
T* p = nullptr;
if constexpr (std::is_constructible_v<T, v8::Isolate*, Args&&...>) {
// Supply the isolate* to the target constructor if it's the first parameter.
p = cppgc::MakeGarbageCollected<T>(ALLOCATION_HANDLE_FOR_ISOLATE(isolate), isolate, std::forward<Args>(args)...);
} else {
p = cppgc::MakeGarbageCollected<T>(ALLOCATION_HANDLE_FOR_ISOLATE(isolate), std::forward<Args>(args)...);
}
//std::cout << "MakeGarbageCollected<" << InvokeClassName<T>() << ">() -> (" << (void*)p << ")\n";
return p;
}
using TracedValue = v8::TracedReference<v8::Value>;
using TracedObject = v8::TracedReference<v8::Object>;
template <typename T>
v8::TracedReference<T> ToTraced(v8::Isolate* isolate, v8::Local<T> local) {
return v8::TracedReference<T>(isolate, local);
}
template <typename T>
v8::TracedReference<T> ToTraced(v8::Isolate* isolate, v8::PersistentBase<T> persistent) {
return v8::TracedReference<typename T::ValueType>(isolate, persistent);
}
class CommonPrivate {
private:
static v8::Local<v8::Object> CreateExtensibleWrapperObject(v8::Isolate*, v8::Local<v8::Context>);
static inline v8::Local<v8::Object> CreateWrapperObject(v8::Isolate* isolate, v8::Local<v8::Context> context)
{
auto result = CreateExtensibleWrapperObject(isolate, context);
result->SetIntegrityLevel(context, v8::IntegrityLevel::kSealed);
return result;
}
template <typename T, typename U>
friend v8::Local<v8::Object> CreateWrapperFor(v8::Isolate*, v8::Local<v8::Context>, T*);
template <typename T, typename U>
friend v8::Local<v8::Object> CreateExtensibleWrapperFor(v8::Isolate*, v8::Local<v8::Context>, T*);
friend bool IsGarbageCollectedWrapper(v8::Local<v8::Object>);
};
static constexpr uint16_t kGarbageCollectedEmbedderId = 5440;
static constexpr v8::WrapperDescriptor kGarbageCollectedWrapperDescriptor {
0, /* wrappable_type_index, field which holds Smi-encoded kGarbageCollectedEmbedderId */
1, /* wrappable_instance_index, field which holds a BaseDataWrapper* or other GC'd type */
kGarbageCollectedEmbedderId,
};
static constexpr int kMinGarbageCollectedEmbedderFields = 2;
static_assert(kMinGarbageCollectedEmbedderFields >=
std::max(
kGarbageCollectedWrapperDescriptor.wrappable_type_index,
kGarbageCollectedWrapperDescriptor.wrappable_instance_index));
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
static inline bool AttachGarbageCollectedWrapper(v8::Local<v8::Object> object, T* p)
{
//std::cout << "Attaching GC Wrapper" << InvokeClassName<T>() << " (" << (void*)p << ") to v8 object " << *object << "\n";
alignas(2) static const uint16_t embedder_id { kGarbageCollectedEmbedderId };
if (object->InternalFieldCount() < kMinGarbageCollectedEmbedderFields)
return false;
auto desc = kGarbageCollectedWrapperDescriptor;
object->SetAlignedPointerInInternalField(desc.wrappable_type_index, (void*)&embedder_id);
object->SetAlignedPointerInInternalField(desc.wrappable_instance_index, p);
return true;
}
static inline void DetachGarbageCollectedWrapper(v8::Local<v8::Object> object)
{
if (object->InternalFieldCount() < kMinGarbageCollectedEmbedderFields)
return;
auto desc = kGarbageCollectedWrapperDescriptor;
object->SetAlignedPointerInInternalField(desc.wrappable_type_index, nullptr);
object->SetAlignedPointerInInternalField(desc.wrappable_instance_index, nullptr);
}
inline bool IsGarbageCollectedWrapper(v8::Local<v8::Object> object)
{
static auto test = [](void* p) {
if (!p) return false;
return *static_cast<uint16_t*>(p) == kGarbageCollectedEmbedderId;
};
auto desc = kGarbageCollectedWrapperDescriptor;
return !object.IsEmpty() && object->InternalFieldCount() >= kMinGarbageCollectedEmbedderFields && test(object->GetAlignedPointerFromInternalField(desc.wrappable_type_index));
}
inline bool IsGarbageCollectedWrapper(v8::Local<v8::Value> object)
{
if (!object->IsObject())
return false;
return IsGarbageCollectedWrapper(object.As<v8::Object>());
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
v8::Local<v8::Object> CreateWrapperFor(v8::Isolate* isolate, v8::Local<v8::Context> context, T* ptr)
{
auto result = CommonPrivate::CreateWrapperObject(isolate, context);
AttachGarbageCollectedWrapper(result, ptr);
return result;
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
v8::Local<v8::Object> CreateWrapperFor(v8::Local<v8::Context> context, T* ptr)
{
return CreateWrapperFor<T>(context->GetIsolate(), context, ptr);
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
v8::Local<v8::Object> CreateWrapperFor(v8::Isolate* isolate, T* ptr)
{
return CreateWrapperFor<T>(isolate, isolate->GetCurrentContext(), ptr);
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
v8::Local<v8::Object> CreateExtensibleWrapperFor(v8::Isolate* isolate, v8::Local<v8::Context> context, T* ptr)
{
auto result = CommonPrivate::CreateExtensibleWrapperObject(isolate, context);
AttachGarbageCollectedWrapper(result, ptr);
return result;
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
v8::Local<v8::Object> CreateExtensibleWrapperFor(v8::Local<v8::Context> context, T* ptr)
{
return CreateExtensibleWrapperFor<T>(context->GetIsolate(), context, ptr);
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
v8::Local<v8::Object> CreateExtensibleWrapperFor(v8::Isolate* isolate, T* ptr)
{
return CreateExtensibleWrapperFor<T>(isolate, isolate->GetCurrentContext(), ptr);
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
T* ExtractWrapper(v8::Local<v8::Object> object)
{
if (object.IsEmpty() || !IsGarbageCollectedWrapper(object))
return nullptr;
auto desc = kGarbageCollectedWrapperDescriptor;
return static_cast<T*>(object->GetAlignedPointerFromInternalField(desc.wrappable_instance_index));
}
template <typename T, typename = std::enable_if_t<cppgc::IsGarbageCollectedOrMixinTypeV<T>>>
T* ExtractWrapper(v8::Local<v8::Value> value)
{
if (value.IsEmpty() || !value->IsObject())
return nullptr;
auto object = value.As<v8::Object>();
if (!IsGarbageCollectedWrapper(object))
return nullptr;
auto desc = kGarbageCollectedWrapperDescriptor;
return static_cast<T*>(object->GetAlignedPointerFromInternalField(desc.wrappable_instance_index));
}
}
#include <sstream>
namespace tns {
static inline void PrintProperties(const v8::Local<v8::Object>& obj) {
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::HandleScope scope(isolate);
v8::Local<v8::Array> properties = obj->GetPropertyNames(isolate->GetCurrentContext()).ToLocalChecked();
std::vector<std::string> propertyNames;
for (uint32_t i = 0; i < properties->Length(); ++i) {
v8::Local<v8::Value> key = properties->Get(isolate->GetCurrentContext(), i).ToLocalChecked();
v8::String::Utf8Value utf8Value(isolate, key);
propertyNames.push_back(*utf8Value);
}
std::stringstream ss;
ss << "[ ";
for (const std::string& propertyName : propertyNames) {
ss << propertyName << ",\n";
}
ss << "]" << std::endl;
std::cout << ss.str();
std::cout.flush();
}
}
#endif /* Common_h */