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// 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-isextensible
// https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-isextensible
transitioning builtin ProxyIsExtensible(implicit context: Context)(
proxy: JSProxy): JSAny {
PerformStackCheck();
const kTrapName: constexpr string = 'isExtensible';
try {
// 1. Let handler be O.[[ProxyHandler]].
// 2. If handler is null, throw a TypeError exception.
// 3. Assert: Type(handler) is Object.
assert(proxy.handler == Null || Is<JSReceiver>(proxy.handler));
const handler =
Cast<JSReceiver>(proxy.handler) otherwise ThrowProxyHandlerRevoked;
// 4. Let target be O.[[ProxyTarget]].
const target = proxy.target;
// 5. Let trap be ? GetMethod(handler, "isExtensible").
// 6. If trap is undefined, then (see 6.a below).
const trap: Callable = GetMethod(handler, kTrapName)
otherwise goto TrapUndefined(target);
// 7. Let booleanTrapResult be ToBoolean(? Call(trap, handler, «
// target»)).
const trapResult = ToBoolean(Call(context, trap, handler, target));
// 8. Let targetResult be ? IsExtensible(target).
const targetResult: bool =
ToBoolean(object::ObjectIsExtensibleImpl(target));
// 9. If SameValue(booleanTrapResult, targetResult) is false, throw a
// TypeError exception.
if (trapResult != targetResult) {
ThrowTypeError(
MessageTemplate::kProxyIsExtensibleInconsistent,
SelectBooleanConstant(targetResult));
}
// 10. Return booleanTrapResult.
return SelectBooleanConstant(trapResult);
} label TrapUndefined(target: JSAny) {
// 6.a. Return ? IsExtensible(target).
return object::ObjectIsExtensibleImpl(target);
} label ThrowProxyHandlerRevoked deferred {
ThrowTypeError(MessageTemplate::kProxyRevoked, kTrapName);
}
}
}
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