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/*
* Copyright (c) 2021-2022, 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 {
// 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)
{
auto& vm = global_object.vm();
// 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* wrapped = global_object.heap().allocate<WrappedFunction>(global_object, caller_realm, target, prototype);
// 7. Let result be CopyNameAndLength(wrapped, Target).
auto result = copy_name_and_length(global_object, *wrapped, target);
// 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
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, MarkedVector<Value> 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 = MarkedVector<Value> { 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);
}
}
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