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Copy pathJscEngine.hpp
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374 lines (314 loc) · 13.7 KB
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#pragma once
#include <type_traits>
#include "../../src/Native.h"
#include "../../src/Scope.h"
#include "../../src/Utils.h"
#include "../../src/utils/Helper.hpp"
#include "JscEngine.h"
#include "JscHelper.hpp"
#include "JscReference.hpp"
namespace script::jsc_backend {
template <typename T>
bool JscEngine::registerNativeClassImpl(const ClassDefine<T>* classDefine) {
Tracer traceRegister(this, classDefine->className);
internal::validateClassDefine(classDefine);
Local<Value> object;
ClassRegistryData registry{};
if (classDefine->instanceDefine.constructor) {
// make it constexpr if, save some binary size
if constexpr (!std::is_same_v<T, void>) {
defineInstance(classDefine, object, registry);
} else {
// validateClassDefine will make sure this won't happen
std::terminate();
}
} else {
object = Object::newObject();
}
registerStaticDefine(classDefine->staticDefine, object.asObject());
auto ns = ::script::internal::getNamespaceObject(this, classDefine->getNameSpace(), getGlobal())
.asObject();
ns.set(classDefine->className, object);
classRegistry_.emplace(const_cast<ClassDefine<T>*>(classDefine), registry);
return true;
}
template <typename T>
void JscEngine::defineInstance(const ClassDefine<T>* classDefine, Local<Value>& object,
JscEngine::ClassRegistryData& registry) {
JSClassDefinition instanceDefine = kJSClassDefinitionEmpty;
instanceDefine.attributes = kJSClassAttributeNone;
instanceDefine.className = classDefine->className.c_str();
instanceDefine.finalize = [](JSObjectRef thiz) {
auto* t = static_cast<ScriptClass*>(JSObjectGetPrivate(thiz));
auto engine = script::internal::scriptDynamicCast<JscEngine*>(t->getScriptEngine());
if (!engine->isDestroying()) {
utils::Message dtor([](auto& msg) {},
[](auto& msg) { delete static_cast<ScriptClass*>(msg.ptr0); });
dtor.tag = engine;
dtor.ptr0 = t;
engine->messageQueue()->postMessage(dtor);
} else {
delete t;
}
};
auto clazz = JSClassCreate(&instanceDefine);
registry.instanceClass = clazz;
JSClassDefinition staticDefine = kJSClassDefinitionEmpty;
staticDefine.callAsConstructor = createConstructor<T>();
staticDefine.hasInstance = [](JSContextRef ctx, JSObjectRef constructor,
JSValueRef possibleInstance, JSValueRef* exception) -> bool {
auto engine = static_cast<JscEngine*>(JSObjectGetPrivate(JSContextGetGlobalObject(ctx)));
auto def = static_cast<ClassDefine<T>*>(JSObjectGetPrivate(constructor));
return engine->isInstanceOfImpl(make<Local<Value>>(possibleInstance), def);
};
auto staticClass = JSClassCreate(&staticDefine);
object =
Local<Object>(JSObjectMake(context_, staticClass, const_cast<ClassDefine<T>*>(classDefine)));
// not used anymore
JSClassRelease(staticClass);
registry.constructor = object.asObject();
auto prototype = defineInstancePrototype(classDefine);
object.asObject().set("prototype", prototype);
registry.prototype = prototype;
}
template <typename T>
JSObjectCallAsConstructorCallback JscEngine::createConstructor() {
return [](JSContextRef ctx, JSObjectRef constructor, size_t argumentCount,
const JSValueRef arguments[], JSValueRef* exception) {
auto engine = static_cast<JscEngine*>(JSObjectGetPrivate(JSContextGetGlobalObject(ctx)));
auto def = static_cast<ClassDefine<T>*>(JSObjectGetPrivate(constructor));
Tracer trace(engine, def->className);
auto it = engine->classRegistry_.find(def);
assert(it != engine->classRegistry_.end());
ClassRegistryData& registry = it->second;
auto object = JSObjectMake(ctx, registry.instanceClass, nullptr);
auto callbackInfo = newArguments(engine, object, arguments, argumentCount);
try {
StackFrameScope stack;
T* thiz;
if (argumentCount == 2 && engine->isConstructorMarkSymbol(arguments[0]) &&
JSValueIsObjectOfClass(engine->context_, arguments[1], externalClass_)) {
// this logic is for
// ScriptClass::ScriptClass(const ClassDefine<T> &define)
auto obj = JSValueToObject(engine->context_, arguments[1], exception);
checkException(*exception);
thiz = static_cast<T*>(JSObjectGetPrivate(obj));
} else {
// this logic is for
// ScriptClass::ScriptClass(const Local<Object>& thiz)
thiz = def->instanceDefine.constructor(callbackInfo);
}
if (thiz) {
thiz->internalState_.classDefine = def;
JSObjectSetPrivate(object, thiz);
JSObjectSetPrototype(ctx, object,
toJsc(engine->context_, registry.prototype.get().asValue()));
return object;
} else {
throw Exception("constructor returns null");
}
} catch (Exception& e) {
*exception = toJsc(engine->context_, e.exception());
// can't return undefined, just return empty object;
return object;
}
};
}
template <typename T>
Local<Object> JscEngine::defineInstancePrototype(const ClassDefine<T>* classDefine) {
Local<Object> proto = Object::newObject();
defineInstanceFunction(classDefine, proto);
if (!classDefine->instanceDefine.properties.empty()) {
auto jsObject = getGlobal().get("Object").asObject();
auto jsObject_def = jsObject.get("defineProperty").asFunction();
auto get = String::newString("get");
auto set = String::newString("set");
defineInstanceProperties(classDefine, [&get, &set, &jsObject, &jsObject_def, &proto](
const Local<String>& name, const Local<Value>& getter,
const Local<Value>& setter) {
auto desc = Object::newObject();
if (!getter.isNull()) desc.set(get, getter);
if (!setter.isNull()) desc.set(set, setter);
// set prop to prototype
jsObject_def.call(jsObject, {proto, name, desc});
});
}
return proto;
}
template <typename T>
void JscEngine::defineInstanceFunction(const ClassDefine<T>* classDefine,
Local<Object>& prototypeObject) {
struct ContextData {
typename internal::InstanceDefine<T>::FunctionDefine* functionDefine;
JscEngine* engine;
const ClassDefine<T>* classDefine;
};
for (auto& f : classDefine->instanceDefine.functions) {
StackFrameScope stack;
JSClassDefinition jsFunc = kJSClassDefinitionEmpty;
jsFunc.className = "anonymous";
jsFunc.callAsFunction = [](JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
size_t argumentCount, const JSValueRef arguments[],
JSValueRef* exception) {
auto data = static_cast<ContextData*>(JSObjectGetPrivate(function));
auto fp = data->functionDefine;
auto engine = data->engine;
auto def = data->classDefine;
auto& callback = fp->callback;
Tracer trace(engine, fp->traceName);
auto args = newArguments(engine, thisObject, arguments, argumentCount);
try {
auto* t = static_cast<T*>(JSObjectGetPrivate(thisObject));
if (!t || t->internalState_.classDefine != def) {
throw Exception(u8"call function on wrong receiver");
}
auto returnVal = callback(t, args);
return toJsc(engine->context_, returnVal);
} catch (Exception& e) {
*exception = jsc_backend::JscEngine::toJsc(engine->context_, e.exception());
return JSValueMakeUndefined(currentEngineContextChecked());
}
};
jsFunc.finalize = [](JSObjectRef function) {
delete static_cast<ContextData*>(JSObjectGetPrivate(function));
};
auto funcClazz = JSClassCreate(&jsFunc);
Local<Function> funcObj(JSObjectMake(
currentEngineContextChecked(), funcClazz,
new ContextData{const_cast<typename internal::InstanceDefine<T>::FunctionDefine*>(&f), this,
classDefine}));
// not used anymore
JSClassRelease(funcClazz);
auto name = String::newString(f.name);
prototypeObject.set(name, funcObj);
}
}
template <typename T, typename ConsumeLambda>
void JscEngine::defineInstanceProperties(const ClassDefine<T>* classDefine,
ConsumeLambda consumerLambda) {
struct ContextData {
typename internal::InstanceDefine<T>::PropertyDefine* propertyDefine;
JscEngine* engine;
const ClassDefine<T>* classDefine;
};
for (auto& p : classDefine->instanceDefine.properties) {
StackFrameScope stack;
Local<Value> getter;
Local<Value> setter;
if (p.getter) {
JSClassDefinition jsFunc = kJSClassDefinitionEmpty;
jsFunc.className = "getter";
jsFunc.callAsFunction = [](JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
size_t argumentCount, const JSValueRef arguments[],
JSValueRef* exception) {
auto data = static_cast<ContextData*>(JSObjectGetPrivate(function));
auto pp = data->propertyDefine;
auto engine = data->engine;
auto def = data->classDefine;
Tracer trace(engine, pp->traceName);
try {
auto* t = static_cast<T*>(JSObjectGetPrivate(thisObject));
if (!t || t->internalState_.classDefine != def) {
throw Exception(u8"call function on wrong receiver");
}
auto value = (pp->getter)(t);
return toJsc(engine->context_, value);
} catch (Exception& e) {
*exception = jsc_backend::JscEngine::toJsc(engine->context_, e.exception());
return JSValueMakeUndefined(engine->context_);
}
};
jsFunc.finalize = [](JSObjectRef function) {
delete static_cast<ContextData*>(JSObjectGetPrivate(function));
};
auto funcClazz = JSClassCreate(&jsFunc);
getter = Local<Function>(JSObjectMake(
currentEngineContextChecked(), funcClazz,
new ContextData{const_cast<typename internal::InstanceDefine<T>::PropertyDefine*>(&p),
this, classDefine}));
JSClassRelease(funcClazz);
}
if (p.setter) {
JSClassDefinition jsFunc = kJSClassDefinitionEmpty;
jsFunc.className = "setter";
jsFunc.callAsFunction = [](JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
size_t argumentCount, const JSValueRef arguments[],
JSValueRef* exception) {
auto data = static_cast<ContextData*>(JSObjectGetPrivate(function));
auto pp = data->propertyDefine;
auto engine = data->engine;
auto def = data->classDefine;
Tracer trace(engine, pp->traceName);
auto args = newArguments(engine, thisObject, arguments, argumentCount);
if (args.size() > 0) {
try {
auto* t = static_cast<T*>(JSObjectGetPrivate(thisObject));
if (!t || t->internalState_.classDefine != def) {
throw Exception(u8"call function on wrong receiver");
}
(pp->setter)(t, args[0]);
} catch (Exception& e) {
*exception = jsc_backend::JscEngine::toJsc(engine->context_, e.exception());
}
}
return JSValueMakeUndefined(engine->context_);
};
jsFunc.finalize = [](JSObjectRef function) {
delete static_cast<ContextData*>(JSObjectGetPrivate(function));
};
auto funcClazz = JSClassCreate(&jsFunc);
setter = Local<Function>(JSObjectMake(
context_, funcClazz,
new ContextData{const_cast<typename internal::InstanceDefine<T>::PropertyDefine*>(&p),
this, classDefine}));
JSClassRelease(funcClazz);
}
consumerLambda(String::newString(p.name), getter, setter);
}
}
template <typename T>
Local<Object> JscEngine::newNativeClassImpl(const ClassDefine<T>* classDefine, size_t size,
const Local<Value>* args) {
auto it = classRegistry_.find(const_cast<ClassDefine<T>*>(classDefine));
if (it == classRegistry_.end()) {
registerNativeClassImpl(classDefine);
it = classRegistry_.find(const_cast<ClassDefine<T>*>(classDefine));
}
if (it != classRegistry_.end() && !it->second.constructor.isEmpty()) {
return jsc_backend::toJscValues<Local<Object>>(
context_, size, args, [this, &it, size](JSValueRef* array) {
JSValueRef jscException = nullptr;
Local<Value> ret(JSObjectCallAsConstructor(
context_, toJsc(context_, it->second.constructor.get()), size, array, &jscException));
jsc_backend::JscEngine::checkException(jscException);
return ret.asObject();
});
}
throw Exception("can't create native class");
}
template <typename T>
bool JscEngine::isInstanceOfImpl(const Local<Value>& value, const ClassDefine<T>* classDefine) {
if (!value.isObject()) return false;
auto it = classRegistry_.find(const_cast<ClassDefine<T>*>(classDefine));
if (it != classRegistry_.end() && !it->second.constructor.isEmpty()) {
return JSValueIsObjectOfClass(context_, toJsc(context_, value), it->second.instanceClass);
}
return false;
}
template <typename T>
T* JscEngine::getNativeInstanceImpl(const Local<Value>& value, const ClassDefine<T>* classDefine) {
if (value.isObject() && isInstanceOfImpl(value, classDefine)) {
return reinterpret_cast<T*>(JSObjectGetPrivate(value.asObject().val_));
}
return nullptr;
}
inline typename RefTypeMap<Value>::jscType JscEngine::toJsc(JSGlobalContextRef context,
const Local<Value>& ref) {
if (ref.isNull()) {
return Local<Value>(
const_cast<typename Local<Value>::InternalLocalRef>(JSValueMakeUndefined(context)))
.val_;
}
return ref.val_;
}
} // namespace script::jsc_backend
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