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50f8755792
This is a new concept from the ShadowRealm API stage 3 proposal: https://tc39.es/proposal-shadowrealm/#sec-wrapped-function-exotic-objects
103 lines
4 KiB
C++
103 lines
4 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/ShadowRealm.h>
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#include <LibJS/Runtime/WrappedFunction.h>
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namespace JS {
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// 2.2 WrappedFunctionCreate ( callerRealm, targetFunction ), https://tc39.es/proposal-shadowrealm/#sec-wrappedfunctioncreate
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WrappedFunction* WrappedFunction::create(GlobalObject& global_object, Realm& caller_realm, FunctionObject& target_function)
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{
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// 1. Assert: callerRealm is a Realm Record.
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// 2. Assert: IsCallable(targetFunction) is true.
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// 3. Let internalSlotsList be the internal slots listed in Table 2, plus [[Prototype]] and [[Extensible]].
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// 4. Let obj be ! MakeBasicObject(internalSlotsList).
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auto& prototype = *caller_realm.global_object().function_prototype();
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auto* object = global_object.heap().allocate<WrappedFunction>(global_object, caller_realm, target_function, prototype);
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// 5. Set obj.[[Prototype]] to callerRealm.[[Intrinsics]].[[%Function.prototype%]].
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// 6. Set obj.[[Call]] as described in 2.1.
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// 7. Set obj.[[WrappedTargetFunction]] to targetFunction.
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// 8. Set obj.[[Realm]] to callerRealm.
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// 9. Return obj.
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return object;
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}
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// 2 Wrapped Function Exotic Objects, https://tc39.es/proposal-shadowrealm/#sec-wrapped-function-exotic-objects
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WrappedFunction::WrappedFunction(Realm& realm, FunctionObject& wrapped_target_function, Object& prototype)
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: FunctionObject(prototype)
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, m_wrapped_target_function(wrapped_target_function)
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, m_realm(realm)
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{
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}
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// 2.1 [[Call]] ( thisArgument, argumentsList ), https://tc39.es/proposal-shadowrealm/#sec-wrapped-function-exotic-objects-call-thisargument-argumentslist
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ThrowCompletionOr<Value> WrappedFunction::internal_call(Value this_argument, MarkedValueList arguments_list)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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// 1. Let target be F.[[WrappedTargetFunction]].
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auto& target = m_wrapped_target_function;
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// 2. Assert: IsCallable(target) is true.
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VERIFY(Value(&target).is_function());
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// 3. Let targetRealm be ? GetFunctionRealm(target).
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auto* target_realm = TRY(get_function_realm(global_object, target));
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// 4. Let callerRealm be ? GetFunctionRealm(F).
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auto* caller_realm = TRY(get_function_realm(global_object, *this));
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// 5. NOTE: Any exception objects produced after this point are associated with callerRealm.
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// 6. Let wrappedArgs be a new empty List.
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auto wrapped_args = MarkedValueList { vm.heap() };
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wrapped_args.ensure_capacity(arguments_list.size());
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// 7. For each element arg of argumentsList, do
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for (auto& arg : arguments_list) {
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// a. Let wrappedValue be ? GetWrappedValue(targetRealm, arg).
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auto wrapped_value = TRY(get_wrapped_value(global_object, *target_realm, arg));
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// b. Append wrappedValue to wrappedArgs.
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wrapped_args.append(wrapped_value);
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}
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// 8. Let wrappedThisArgument to ? GetWrappedValue(targetRealm, thisArgument).
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auto wrapped_this_argument = TRY(get_wrapped_value(global_object, *target_realm, this_argument));
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// 9. Let result be the Completion Record of Call(target, wrappedThisArgument, wrappedArgs).
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auto result = call(global_object, &target, wrapped_this_argument, move(wrapped_args));
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// 10. If result.[[Type]] is normal or result.[[Type]] is return, then
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if (!result.is_throw_completion()) {
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// a. Return ? GetWrappedValue(callerRealm, result.[[Value]]).
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return get_wrapped_value(global_object, *caller_realm, result.value());
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}
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// 11. Else,
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else {
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// a. Throw a TypeError exception.
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return vm.throw_completion<TypeError>(caller_realm->global_object(), ErrorType::WrappedFunctionCallThrowCompletion);
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}
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// NOTE: Also see "Editor's Note" in the spec regarding the TypeError above.
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}
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void WrappedFunction::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(&m_wrapped_target_function);
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visitor.visit(&m_realm);
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}
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}
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