src/third_party/v8/src/builtins/proxy-has-property.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.

#include 'src/builtins/builtins-proxy-gen.h'

namespace proxy {

// ES #sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p
// https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p
transitioning builtin ProxyHasProperty(implicit context: Context)(
    proxy: JSProxy, name: PropertyKey): JSAny {
  assert(Is<JSProxy>(proxy));

  PerformStackCheck();

  // 1. Assert: IsPropertyKey(P) is true.
  assert(Is<Name>(name));
  assert(!IsPrivateSymbol(name));

  try {
    // 2. Let handler be O.[[ProxyHandler]].
    // 3. If handler is null, throw a TypeError exception.
    // 4. Assert: Type(handler) is Object.
    assert(proxy.handler == Null || Is<JSReceiver>(proxy.handler));
    const handler =
        Cast<JSReceiver>(proxy.handler) otherwise ThrowProxyHandlerRevoked;

    // 5. Let target be O.[[ProxyTarget]].
    const target = Cast<JSReceiver>(proxy.target) otherwise unreachable;

    // 6. Let trap be ? GetMethod(handler, "has").
    // 7. If trap is undefined, then (see 7.a below).
    const trap: Callable = GetMethod(handler, 'has')
        otherwise goto TrapUndefined(target);

    // 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, «
    // target»)).
    // 9. If booleanTrapResult is false, then (see 9.a. in
    // CheckHasTrapResult).
    // 10. Return booleanTrapResult.
    const trapResult = Call(context, trap, handler, target, name);
    if (ToBoolean(trapResult)) {
      return True;
    }
    CheckHasTrapResult(target, proxy, name);
    return False;
  } label TrapUndefined(target: JSAny) {
    // 7.a. Return ? target.[[HasProperty]](P).
    tail HasProperty(target, name);
  } label ThrowProxyHandlerRevoked deferred {
    ThrowTypeError(MessageTemplate::kProxyRevoked, 'has');
  }
}
}