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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 {
extern transitioning builtin GetPropertyWithReceiver(implicit context: Context)(
JSAny, Name, JSAny, Smi): JSAny;
// ES #sec-proxy-object-internal-methods-and-internal-slots-get-p-receiver
// https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-get-p-receiver
transitioning builtin
ProxyGetProperty(implicit context: Context)(
proxy: JSProxy, name: PropertyKey, receiverValue: JSAny,
onNonExistent: Smi): JSAny {
PerformStackCheck();
// 1. Assert: IsPropertyKey(P) is true.
assert(TaggedIsNotSmi(name));
assert(Is<Name>(name));
assert(!IsPrivateSymbol(name));
// 2. Let handler be O.[[ProxyHandler]].
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
let handler: JSReceiver;
typeswitch (proxy.handler) {
case (Null): {
ThrowTypeError(MessageTemplate::kProxyRevoked, 'get');
}
case (h: JSReceiver): {
handler = h;
}
}
// 5. Let target be O.[[ProxyTarget]].
const target = Cast<JSReceiver>(proxy.target) otherwise unreachable;
// 6. Let trap be ? GetMethod(handler, "get").
// 7. If trap is undefined, then (see 7.a below).
// 7.a. Return ? target.[[Get]](P, Receiver).
const trap: Callable = GetMethod(handler, 'get')
otherwise return GetPropertyWithReceiver(
target, name, receiverValue, onNonExistent);
// 8. Let trapResult be ? Call(trap, handler, « target, P, Receiver »).
const trapResult = Call(context, trap, handler, target, name, receiverValue);
// 9. Let targetDesc be ? target.[[GetOwnProperty]](P).
// 10. If targetDesc is not undefined and targetDesc.[[Configurable]] is
// false, then
// a. If IsDataDescriptor(targetDesc) is true and targetDesc.[[Writable]]
// is false, then
// i. If SameValue(trapResult, targetDesc.[[Value]]) is false, throw a
// TypeError exception.
// b. If IsAccessorDescriptor(targetDesc) is true and targetDesc.[[Get]]
// is undefined, then
// i. If trapResult is not undefined, throw a TypeError exception.
// 11. Return trapResult.
CheckGetSetTrapResult(target, proxy, name, trapResult, kProxyGet);
return trapResult;
}
}
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