bun.sh/src/javascript/jsc/bindings/napi.h

#pragma once

namespace Zig {
class GlobalObject;
}

#include "root.h"
#include "JavaScriptCore/JSFunction.h"
#include "JavaScriptCore/VM.h"

#include "headers-handwritten.h"
#include "BunClientData.h"
#include "JavaScriptCore/CallFrame.h"
#include "js_native_api_types.h"
#include "JavaScriptCore/JSWeakValue.h"
#include "JSFFIFunction.h"

namespace JSC {
class JSGlobalObject;
class JSSourceCode;
}

namespace Napi {
JSC::SourceCode generateSourceCode(WTF::String keyString, JSC::VM& vm, JSC::JSObject* object, JSC::JSGlobalObject* globalObject);
}

namespace Zig {

using namespace JSC;

static inline JSValue toJS(napi_value val)
{
    return JSC::JSValue::decode(reinterpret_cast<JSC::EncodedJSValue>(val));
}

static inline Zig::GlobalObject* toJS(napi_env val)
{
    return reinterpret_cast<Zig::GlobalObject*>(val);
}

static inline napi_value toNapi(JSC::EncodedJSValue val)
{
    return reinterpret_cast<napi_value>(val);
}

static inline napi_value toNapi(JSC::JSValue val)
{
    return toNapi(JSC::JSValue::encode(val));
}

static inline napi_env toNapi(JSC::JSGlobalObject* val)
{
    return reinterpret_cast<napi_env>(val);
}

class NapiFinalizer {
public:
    void* finalize_hint = nullptr;
    napi_finalize finalize_cb;

    void call(JSC::JSGlobalObject* globalObject, void* data);
};

class NapiRef : public RefCounted<NapiRef>, public CanMakeWeakPtr<NapiRef> {
    WTF_MAKE_FAST_ALLOCATED;

public:
    void ref();
    void unref();
    void clear();

    NapiRef(JSC::JSGlobalObject* global, uint32_t count)
    {
        globalObject = JSC::Weak<JSC::JSGlobalObject>(global);
        strongRef = {};
        weakValueRef.clear();
        refCount = count;
    }

    JSC::JSValue value() const
    {
        if (refCount == 0) {
            if (!weakValueRef.isSet()) {
                return JSC::JSValue {};
            }

            if (weakValueRef.isString()) {
                return JSC::JSValue(weakValueRef.string());
            }

            if (weakValueRef.isObject()) {
                return JSC::JSValue(weakValueRef.object());
            }

            return weakValueRef.primitive();
        }

        return strongRef.get();
    }

    ~NapiRef()
    {
        if (this->refCount > 0) {
            this->refCount = 1;
            this->unref();
        }
    }

    JSC::Weak<JSC::JSGlobalObject> globalObject;
    JSC::JSWeakValue weakValueRef;
    JSC::Strong<JSC::Unknown> strongRef;
    NapiFinalizer finalizer;
    void* data = nullptr;
    uint32_t refCount = 0;
};

static inline napi_ref toNapi(NapiRef* val)
{
    return reinterpret_cast<napi_ref>(val);
}

class NapiClass final : public JSC::JSFunction {
public:
    using Base = JSFunction;

    static constexpr unsigned StructureFlags = Base::StructureFlags;
    static constexpr bool needsDestruction = false;
    static void destroy(JSCell* cell)
    {
        static_cast<NapiClass*>(cell)->NapiClass::~NapiClass();
    }

    template<typename, SubspaceAccess mode> static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
    {
        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
            return nullptr;
        return WebCore::subspaceForImpl<NapiClass, WebCore::UseCustomHeapCellType::No>(
            vm,
            [](auto& spaces) { return spaces.m_clientSubspaceForNapiClass.get(); },
            [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForNapiClass = WTFMove(space); },
            [](auto& spaces) { return spaces.m_subspaceForNapiClass.get(); },
            [](auto& spaces, auto&& space) { spaces.m_subspaceForNapiClass = WTFMove(space); });
    }

    DECLARE_EXPORT_INFO;

    JS_EXPORT_PRIVATE static NapiClass* create(VM&, Zig::GlobalObject*, const char* utf8name,
        size_t length,
        napi_callback constructor,
        void* data,
        size_t property_count,
        const napi_property_descriptor* properties);

    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
    {
        ASSERT(globalObject);
        return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
    }

    static CallData getConstructData(JSCell* cell);

    FFIFunction constructor()
    {
        return m_constructor;
    }

    void* dataPtr = nullptr;
    FFIFunction m_constructor = nullptr;

private:
    NapiClass(VM& vm, NativeExecutable* executable, JSC::JSGlobalObject* global, Structure* structure)
        : Base(vm, executable, global, structure)
    {
    }
    void finishCreation(VM&, NativeExecutable*, unsigned length, const String& name, napi_callback constructor,
        void* data,
        size_t property_count,
        const napi_property_descriptor* properties);

    DECLARE_VISIT_CHILDREN;
};

class NapiPrototype : public JSC::JSDestructibleObject {
public:
    using Base = JSC::JSDestructibleObject;

    static constexpr unsigned StructureFlags = Base::StructureFlags;
    static constexpr bool needsDestruction = true;

    template<typename CellType, SubspaceAccess>
    static CompleteSubspace* subspaceFor(VM& vm)
    {
        return &vm.destructibleObjectSpace();
    }

    DECLARE_INFO;

    static NapiPrototype* create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
    {
        NapiPrototype* footprint = new (NotNull, allocateCell<NapiPrototype>(vm)) NapiPrototype(vm, structure);
        footprint->finishCreation(vm);
        return footprint;
    }

    static NapiPrototype* create(VM& vm, JSGlobalObject* globalObject)
    {
        Structure* structure = createStructure(vm, globalObject, globalObject->objectPrototype());
        return create(vm, globalObject, structure);
    }

    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
    {
        ASSERT(globalObject);
        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
    }

    NapiPrototype* subclass(JSC::JSObject* newTarget)
    {
        auto& vm = this->vm();
        auto* structure = InternalFunction::createSubclassStructure(globalObject(),
            newTarget,
            this->structure());
        NapiPrototype* footprint = new (NotNull, allocateCell<NapiPrototype>(vm)) NapiPrototype(vm, structure);
        footprint->finishCreation(vm);
        return footprint;
    }

    NapiRef* napiRef = nullptr;

private:
    NapiPrototype(VM& vm, Structure* structure)
        : Base(vm, structure)
    {
    }
};

static inline NapiRef* toJS(napi_ref val)
{
    return reinterpret_cast<NapiRef*>(val);
}

}