1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
// 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 {
dcheck(Is<JSProxy>(proxy));
PerformStackCheck();
// 1. Assert: IsPropertyKey(P) is true.
dcheck(Is<Name>(name));
dcheck(!IsPrivateSymbol(name));
try {
// 2. Let handler be O.[[ProxyHandler]].
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
dcheck(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');
}
}
}
|
