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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/ShadowRealm.h>
#include <LibJS/Runtime/WrappedFunction.h>
namespace JS {
// 2.2 WrappedFunctionCreate ( callerRealm, targetFunction ), https://tc39.es/proposal-shadowrealm/#sec-wrappedfunctioncreate
WrappedFunction* WrappedFunction::create(GlobalObject& global_object, Realm& caller_realm, FunctionObject& target_function)
{
// 1. Assert: callerRealm is a Realm Record.
// 2. Assert: IsCallable(targetFunction) is true.
// 3. Let internalSlotsList be the internal slots listed in Table 2, plus [[Prototype]] and [[Extensible]].
// 4. Let obj be ! MakeBasicObject(internalSlotsList).
auto& prototype = *caller_realm.global_object().function_prototype();
auto* object = global_object.heap().allocate<WrappedFunction>(global_object, caller_realm, target_function, prototype);
// 5. Set obj.[[Prototype]] to callerRealm.[[Intrinsics]].[[%Function.prototype%]].
// 6. Set obj.[[Call]] as described in 2.1.
// 7. Set obj.[[WrappedTargetFunction]] to targetFunction.
// 8. Set obj.[[Realm]] to callerRealm.
// 9. Return obj.
return object;
}
// 2 Wrapped Function Exotic Objects, https://tc39.es/proposal-shadowrealm/#sec-wrapped-function-exotic-objects
WrappedFunction::WrappedFunction(Realm& realm, FunctionObject& wrapped_target_function, Object& prototype)
: FunctionObject(prototype)
, m_wrapped_target_function(wrapped_target_function)
, m_realm(realm)
{
}
// 2.1 [[Call]] ( thisArgument, argumentsList ), https://tc39.es/proposal-shadowrealm/#sec-wrapped-function-exotic-objects-call-thisargument-argumentslist
ThrowCompletionOr<Value> WrappedFunction::internal_call(Value this_argument, MarkedValueList arguments_list)
{
auto& vm = this->vm();
auto& global_object = this->global_object();
// 1. Let target be F.[[WrappedTargetFunction]].
auto& target = m_wrapped_target_function;
// 2. Assert: IsCallable(target) is true.
VERIFY(Value(&target).is_function());
// 3. Let targetRealm be ? GetFunctionRealm(target).
auto* target_realm = TRY(get_function_realm(global_object, target));
// 4. Let callerRealm be ? GetFunctionRealm(F).
auto* caller_realm = TRY(get_function_realm(global_object, *this));
// 5. NOTE: Any exception objects produced after this point are associated with callerRealm.
// 6. Let wrappedArgs be a new empty List.
auto wrapped_args = MarkedValueList { vm.heap() };
wrapped_args.ensure_capacity(arguments_list.size());
// 7. For each element arg of argumentsList, do
for (auto& arg : arguments_list) {
// a. Let wrappedValue be ? GetWrappedValue(targetRealm, arg).
auto wrapped_value = TRY(get_wrapped_value(global_object, *target_realm, arg));
// b. Append wrappedValue to wrappedArgs.
wrapped_args.append(wrapped_value);
}
// 8. Let wrappedThisArgument to ? GetWrappedValue(targetRealm, thisArgument).
auto wrapped_this_argument = TRY(get_wrapped_value(global_object, *target_realm, this_argument));
// 9. Let result be the Completion Record of Call(target, wrappedThisArgument, wrappedArgs).
auto result = call(global_object, &target, wrapped_this_argument, move(wrapped_args));
// 10. If result.[[Type]] is normal or result.[[Type]] is return, then
if (!result.is_throw_completion()) {
// a. Return ? GetWrappedValue(callerRealm, result.[[Value]]).
return get_wrapped_value(global_object, *caller_realm, result.value());
}
// 11. Else,
else {
// a. Throw a TypeError exception.
return vm.throw_completion<TypeError>(caller_realm->global_object(), ErrorType::WrappedFunctionCallThrowCompletion);
}
// NOTE: Also see "Editor's Note" in the spec regarding the TypeError above.
}
void WrappedFunction::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(&m_wrapped_target_function);
visitor.visit(&m_realm);
}
}
|
