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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
// 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 runtime
SetPropertyWithReceiver(implicit context:
Context)(Object, Name, Object, Object): void;
transitioning macro CallThrowTypeErrorIfStrict(implicit context: Context)(
message: constexpr MessageTemplate) {
ThrowTypeErrorIfStrict(SmiConstant(message), Null, Null);
}
// ES #sec-proxy-object-internal-methods-and-internal-slots-set-p-v-receiver
// https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-set-p-v-receiver
transitioning builtin
ProxySetProperty(implicit context: Context)(
proxy: JSProxy, name: Name, value: Object,
receiverValue: Object): Object {
// 1. Assert: IsPropertyKey(P) is true.
assert(TaggedIsNotSmi(name));
assert(IsName(name));
if (IsPrivateSymbol(name)) {
CallThrowTypeErrorIfStrict(kProxyPrivate);
return Undefined;
}
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 = UnsafeCast<JSReceiver>(proxy.target);
// 6. Let trap be ? GetMethod(handler, "set").
// 7. If trap is undefined, then (see 7.a below).
const trap: Callable = GetMethod(handler, 'set')
otherwise goto TrapUndefined(target);
// 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler,
// « target, P, V, Receiver »)).
// 9. If booleanTrapResult is false, return false.
// 10. Let targetDesc be ? target.[[GetOwnProperty]](P).
// 11. 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(V, targetDesc.[[Value]]) is false, throw a
// TypeError exception.
// b. If IsAccessorDescriptor(targetDesc) is true, then
// i. If targetDesc.[[Set]] is undefined, throw a TypeError
// exception.
// 12. Return true.
const trapResult =
Call(context, trap, handler, target, name, value, receiverValue);
if (BranchIfToBooleanIsTrue(trapResult)) {
CheckGetSetTrapResult(target, proxy, name, value, kProxySet);
return value;
}
ThrowTypeErrorIfStrict(
SmiConstant(kProxyTrapReturnedFalsishFor), 'set', name);
return value;
}
label TrapUndefined(target: Object) {
// 7.a. Return ? target.[[Set]](P, V, Receiver).
SetPropertyWithReceiver(target, name, value, receiverValue);
return value;
}
label ThrowProxyHandlerRevoked deferred {
ThrowTypeError(kProxyRevoked, 'set');
}
}
}
|
