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#include "Pointer.h"

#include "Caches.h"

#include "Constants.h"

#include "Helpers.h"

#include "NativeScriptException.h"

#include "ObjectManager.h"

using namespace v8;

namespace tns {

void Pointer::Register(Local<Context> context, Local<Object> interop) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<v8::Function> ctorFunc = Pointer::GetPointerCtorFunc(context);

bool success =

interop->Set(context, tns::ToV8String(isolate, "Pointer"), ctorFunc)

.FromMaybe(false);

tns::Assert(success, isolate);

}

Local<Value> Pointer::NewInstance(Local<Context> context, void* handle) {

Isolate* isolate = v8::Isolate::GetCurrent();

intptr_t ptr = static_cast<intptr_t>(reinterpret_cast<size_t>(handle));

Local<Value> arg = BigInt::NewFromUnsigned(isolate, ptr);

Local<Value> args[1]{arg};

Local<Value> result;

Local<v8::Function> ctorFunc = Pointer::GetPointerCtorFunc(context);

bool success = ctorFunc->NewInstance(isolate->GetCurrentContext(), 1, args)

.ToLocal(&result);

if (!success) {

return v8::Undefined(isolate);

}

return result;

}

Local<v8::Function> Pointer::GetPointerCtorFunc(Local<Context> context) {

Isolate* isolate = v8::Isolate::GetCurrent();

auto cache = Caches::Get(isolate);

Persistent<v8::Function>* pointerCtorFunc = cache->PointerCtorFunc.get();

if (pointerCtorFunc != nullptr) {

return pointerCtorFunc->Get(isolate);

}

Local<FunctionTemplate> ctorFuncTemplate =

FunctionTemplate::New(isolate, PointerConstructorCallback);

ctorFuncTemplate->InstanceTemplate()->SetInternalFieldCount(1);

ctorFuncTemplate->SetClassName(tns::ToV8String(isolate, "Pointer"));

Local<v8::Function> ctorFunc;

if (!ctorFuncTemplate->GetFunction(context).ToLocal(&ctorFunc)) {

tns::Assert(false, isolate);

}

tns::SetValue(isolate, ctorFunc, new PointerTypeWrapper());

Local<Value> prototypeValue;

bool success = ctorFunc->Get(context, tns::ToV8String(isolate, "prototype"))

.ToLocal(&prototypeValue);

tns::Assert(success && prototypeValue->IsObject(), isolate);

Local<Object> prototype = prototypeValue.As<Object>();

Pointer::RegisterAddMethod(context, prototype);

Pointer::RegisterSubtractMethod(context, prototype);

Pointer::RegisterToStringMethod(context, prototype);

Pointer::RegisterToHexStringMethod(context, prototype);

Pointer::RegisterToDecimalStringMethod(context, prototype);

Pointer::RegisterToNumberMethod(context, prototype);

Pointer::RegisterToBigIntMethod(context, prototype);

cache->PointerCtorFunc =

std::make_unique<Persistent<v8::Function>>(isolate, ctorFunc);

cache->PointerCtorFunc->SetWrapperClassId(Constants::ClassTypes::DataWrapper);

return ctorFunc;

}

void Pointer::PointerConstructorCallback(

const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

Local<Context> context = isolate->GetCurrentContext();

try {

void* ptr = nullptr;

if (info.Length() == 1) {

bool isBigInt = tns::IsBigInt(info[0]);

bool isNumber = !isBigInt && tns::IsNumber(info[0]);

if (!isBigInt && !isNumber) {

throw NativeScriptException(

"Pointer constructor's first arg must be an integer.");

}

#if __SIZEOF_POINTER__ == 8

// JSC stores 64-bit integers as doubles in JSValue.

// Caution: This means that pointers with more than 54 significant bits

// are likely to be rounded and misrepresented!

// However, current OS and hardware implementations are using 48 bits,

// so we're safe at the time being.

// See https://en.wikipedia.org/wiki/X86-64#Virtual_address_space_details

// and https://en.wikipedia.org/wiki/ARM_architecture#ARMv8-A

// The future is here, and turns out the OS is using more than 54 bits.

// as a result,

int64_t value;

if (isBigInt) {

value = info[0].As<BigInt>()->Int64Value();

} else {

// TODO: Maybe log this?

// #ifdef DEBUG

// syslog(LOG_WARNING, "Using JS Number to represent a

// pointer. Result might be wrong.");

// #endif

tns::Assert(info[0].As<Number>()->IntegerValue(context).To(&value),

isolate);

}

ptr = reinterpret_cast<void*>(value);

#else

int32_t value;

if (isBigInt) {

value = (int32_t)info[0].As<BigInt>()->Int64Value();

} else {

tns::Assert(info[0].As<Number>()->Int32Value(context).To(&value),

isolate);

}

ptr = reinterpret_cast<void*>(value);

#endif

}

auto cache = Caches::Get(isolate);

auto it = cache->PointerInstances.find(ptr);

if (it != cache->PointerInstances.end()) {

info.GetReturnValue().Set(it->second->Get(isolate));

return;

}

PointerWrapper* wrapper = new PointerWrapper(ptr);

tns::SetValue(isolate, info.This(), wrapper);

ObjectManager::Register(context, info.This());

cache->PointerInstances.emplace(

ptr, std::make_shared<Persistent<Object>>(isolate, info.This()));

} catch (NativeScriptException& ex) {

ex.ReThrowToV8(isolate);

}

void Pointer::RegisterAddMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

Local<Context> context = isolate->GetCurrentContext();

tns::Assert(info.Length() == 1 && tns::IsNumber(info[0]), isolate);

BaseDataWrapper* baseWrapper =

tns::GetValueOrReport(isolate, info.This(), "Pointer.add");

if (baseWrapper == nullptr) {

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

void* value = wrapper->Data();

int32_t offset;

tns::Assert(info[0].As<Number>()->Int32Value(context).To(&offset),

isolate);

void* newValue =

reinterpret_cast<void*>(reinterpret_cast<char*>(value) + offset);

Local<Value> result = Pointer::NewInstance(context, newValue);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success = prototype->Set(context, tns::ToV8String(isolate, "add"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

void Pointer::RegisterSubtractMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

Local<Context> context = isolate->GetCurrentContext();

tns::Assert(info.Length() == 1 && tns::IsNumber(info[0]), isolate);

BaseDataWrapper* baseWrapper =

tns::GetValueOrReport(isolate, info.This(), "Pointer.subtract");

if (baseWrapper == nullptr) {

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

void* value = wrapper->Data();

int32_t offset;

tns::Assert(info[0].As<Number>()->Int32Value(context).To(&offset),

isolate);

void* newValue =

reinterpret_cast<void*>(reinterpret_cast<char*>(value) - offset);

intptr_t newValuePtr =

static_cast<intptr_t>(reinterpret_cast<size_t>(newValue));

Local<v8::Function> ctorFunc = Pointer::GetPointerCtorFunc(context);

Local<Value> arg = Number::New(isolate, newValuePtr);

Local<Value> args[1]{arg};

Local<Value> result;

bool success = ctorFunc->NewInstance(context, 1, args).ToLocal(&result);

tns::Assert(success, isolate);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success =

prototype->Set(context, tns::ToV8String(isolate, "subtract"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

void Pointer::RegisterToStringMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

BaseDataWrapper* baseWrapper =

tns::GetValueOrReport(isolate, info.This(), "Pointer.toString");

if (baseWrapper == nullptr) {

// Logging paths stringify objects incidentally; string coercion of

// a released Pointer must stay total under the report policy.

if (tns::GetReleasedObjectPolicy() ==

tns::ReleasedObjectPolicy::kReport) {

info.GetReturnValue().Set(

tns::ToV8String(isolate, "<Pointer: released>"));

}

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

void* value = wrapper->Data();

char buffer[100];

snprintf(buffer, 100, "<Pointer: %p>", value);

Local<v8::String> result = tns::ToV8String(isolate, buffer);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success =

prototype->Set(context, tns::ToV8String(isolate, "toString"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

void Pointer::RegisterToHexStringMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

BaseDataWrapper* baseWrapper =

tns::GetValueOrReport(isolate, info.This(), "Pointer.toHexString");

if (baseWrapper == nullptr) {

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

const void* value = wrapper->Data();

char buffer[100];

snprintf(buffer, 100, "%p", value);

Local<v8::String> result = tns::ToV8String(isolate, buffer);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success =

prototype->Set(context, tns::ToV8String(isolate, "toHexString"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

void Pointer::RegisterToDecimalStringMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

BaseDataWrapper* baseWrapper = tns::GetValueOrReport(

isolate, info.This(), "Pointer.toDecimalString");

if (baseWrapper == nullptr) {

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

const void* value = wrapper->Data();

intptr_t ptr = static_cast<intptr_t>(reinterpret_cast<size_t>(value));

char buffer[100];

snprintf(buffer, 100, "%ld", ptr);

Local<v8::String> result = tns::ToV8String(isolate, buffer);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success =

prototype->Set(context, tns::ToV8String(isolate, "toDecimalString"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

void Pointer::RegisterToNumberMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

BaseDataWrapper* baseWrapper =

tns::GetValueOrReport(isolate, info.This(), "Pointer.toNumber");

if (baseWrapper == nullptr) {

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

const void* value = wrapper->Data();

size_t number = reinterpret_cast<size_t>(value);

Local<Number> result = Number::New(isolate, number);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success =

prototype->Set(context, tns::ToV8String(isolate, "toNumber"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

void Pointer::RegisterToBigIntMethod(Local<Context> context,

Local<Object> prototype) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<FunctionTemplate> funcTemplate = FunctionTemplate::New(

isolate, [](const FunctionCallbackInfo<Value>& info) {

Isolate* isolate = info.GetIsolate();

BaseDataWrapper* baseWrapper =

tns::GetValueOrReport(isolate, info.This(), "Pointer.toBigInt");

if (baseWrapper == nullptr) {

return;

}

PointerWrapper* wrapper = static_cast<PointerWrapper*>(baseWrapper);

const void* value = wrapper->Data();

size_t number = reinterpret_cast<size_t>(value);

Local<BigInt> result = BigInt::NewFromUnsigned(isolate, number);

info.GetReturnValue().Set(result);

});

Local<v8::Function> func;

tns::Assert(funcTemplate->GetFunction(context).ToLocal(&func), isolate);

bool success =

prototype->Set(context, tns::ToV8String(isolate, "toBigInt"), func)

.FromMaybe(false);

tns::Assert(success, isolate);

}

} // namespace tns