src/builtins/reflect.tq

// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

namespace reflect {
// ES6 section 26.1.10 Reflect.isExtensible
transitioning javascript builtin ReflectIsExtensible(
    js-implicit context: NativeContext)(object: JSAny): JSAny {
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(
      MessageTemplate::kCalledOnNonObject, 'Reflect.isExtensible');
  return object::ObjectIsExtensibleImpl(objectJSReceiver);
}

// ES6 section 26.1.12 Reflect.preventExtensions
transitioning javascript builtin ReflectPreventExtensions(
    js-implicit context: NativeContext)(object: JSAny): JSAny {
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(
      MessageTemplate::kCalledOnNonObject, 'Reflect.preventExtensions');
  return object::ObjectPreventExtensionsDontThrow(objectJSReceiver);
}

// ES6 section 26.1.8 Reflect.getPrototypeOf
transitioning javascript builtin ReflectGetPrototypeOf(
    js-implicit context: NativeContext)(object: JSAny): JSAny {
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(
      MessageTemplate::kCalledOnNonObject, 'Reflect.getPrototypeOf');
  return object::JSReceiverGetPrototypeOf(objectJSReceiver);
}

// ES6 section 26.1.14 Reflect.setPrototypeOf
transitioning javascript builtin ReflectSetPrototypeOf(
    js-implicit context: NativeContext)(object: JSAny, proto: JSAny): JSAny {
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(
      MessageTemplate::kCalledOnNonObject, 'Reflect.setPrototypeOf');

  // Wasm objects do not support having prototypes.
  @if(V8_ENABLE_WEBASSEMBLY)
    if (Is<WasmObject>(objectJSReceiver)) {
      ThrowTypeError(MessageTemplate::kWasmObjectsAreOpaque);
    }

  typeswitch (proto) {
    case (proto: JSReceiver|Null): {
      return object::ObjectSetPrototypeOfDontThrow(objectJSReceiver, proto);
    }
    case (JSAny): {
      ThrowTypeError(MessageTemplate::kProtoObjectOrNull, proto);
    }
  }
}

type OnNonExistent constexpr 'OnNonExistent';
const kReturnUndefined: constexpr OnNonExistent
    generates 'OnNonExistent::kReturnUndefined';
extern macro SmiConstant(constexpr OnNonExistent): Smi;
extern transitioning builtin GetPropertyWithReceiver(
    implicit context: Context)(JSAny, Name, JSAny, Smi): JSAny;

// ES6 section 26.1.6 Reflect.get
transitioning javascript builtin ReflectGet(
    js-implicit context: NativeContext)(...arguments): JSAny {
  const object: JSAny = arguments[0];
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(MessageTemplate::kCalledOnNonObject, 'Reflect.get');
  const propertyKey: JSAny = arguments[1];
  const name: AnyName = ToName(propertyKey);
  const receiver: JSAny =
      arguments.length > 2 ? arguments[2] : objectJSReceiver;
  return GetPropertyWithReceiver(
      objectJSReceiver, name, receiver, SmiConstant(kReturnUndefined));
}

// ES6 section 26.1.4 Reflect.deleteProperty
transitioning javascript builtin ReflectDeleteProperty(
    js-implicit context: NativeContext)(object: JSAny, key: JSAny): JSAny {
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(
      MessageTemplate::kCalledOnNonObject, 'Reflect.deleteProperty');
  return DeleteProperty(objectJSReceiver, key, LanguageMode::kSloppy);
}

// ES section #sec-reflect.has
transitioning javascript builtin ReflectHas(
    js-implicit context: NativeContext)(object: JSAny, key: JSAny): JSAny {
  const objectJSReceiver = Cast<JSReceiver>(object)
      otherwise ThrowTypeError(MessageTemplate::kCalledOnNonObject, 'Reflect.has');
  return HasProperty(objectJSReceiver, key);
}

extern transitioning builtin GetOwnPropertyDescriptor(
    implicit context: Context)(JSAny, Name): JSAny;

// ES6 section 26.1.7 Reflect.getOwnPropertyDescriptor
transitioning javascript builtin ReflectGetOwnPropertyDescriptor(
    js-implicit context: NativeContext)(target: JSAny,
    propertyKey: JSAny): JSAny {
  const targetReceiver = Cast<JSReceiver>(target)
      otherwise ThrowTypeError(
      MessageTemplate::kCalledOnNonObject, 'Reflect.getOwnPropertyDescriptor');
  const name = ToName(propertyKey);

  const desc = GetOwnPropertyDescriptor(targetReceiver, name);
  return object::FromPropertyDescriptor(desc);
}
}  // namespace reflect