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LibJS: Let WrappedFunction inherit target name and length

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This is a normative change in the ShadowRealm spec.

See: b73a1dc
This commit is contained in:
Linus Groh 2022-01-24 19:14:04 +00:00
parent 886d6c62f9
commit e20efaa083
6 changed files with 119 additions and 21 deletions
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33
Userland/Libraries/LibJS/Runtime/WrappedFunction.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -10,24 +10,29 @@
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)
// 3.1.1 WrappedFunctionCreate ( callerRealm: a Realm Record, Target: a function object, ), https://tc39.es/proposal-shadowrealm/#sec-wrappedfunctioncreate
ThrowCompletionOr<WrappedFunction*> WrappedFunction::create(GlobalObject& global_object, Realm& caller_realm, FunctionObject& target)
{
// 1. Assert: callerRealm is a Realm Record.
// 2. Assert: IsCallable(targetFunction) is true.
auto& vm = global_object.vm();
// 3. Let internalSlotsList be the internal slots listed in Table 2, plus [[Prototype]] and [[Extensible]].
// 4. Let obj be ! MakeBasicObject(internalSlotsList).
// 1. Let internalSlotsList be the internal slots listed in Table 2, plus [[Prototype]] and [[Extensible]].
// 2. Let wrapped be ! MakeBasicObject(internalSlotsList).
// 3. Set wrapped.[[Prototype]] to callerRealm.[[Intrinsics]].[[%Function.prototype%]].
// 4. Set wrapped.[[Call]] as described in 2.1.
// 5. Set wrapped.[[WrappedTargetFunction]] to Target.
// 6. Set wrapped.[[Realm]] to callerRealm.
auto& prototype = *caller_realm.global_object().function_prototype();
auto* object = global_object.heap().allocate<WrappedFunction>(global_object, caller_realm, target_function, prototype);
auto* wrapped = global_object.heap().allocate<WrappedFunction>(global_object, caller_realm, target, 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.
// 7. Let result be CopyNameAndLength(wrapped, Target, "wrapped").
auto result = copy_name_and_length(global_object, *wrapped, target, "wrapped"sv);
// 9. Return obj.
return object;
// 8. If result is an Abrupt Completion, throw a TypeError exception.
if (result.is_throw_completion())
return vm.throw_completion<TypeError>(global_object, ErrorType::WrappedFunctionCopyNameAndLengthThrowCompletion);
// 9. Return wrapped.
return wrapped;
}
// 2 Wrapped Function Exotic Objects, https://tc39.es/proposal-shadowrealm/#sec-wrapped-function-exotic-objects