fc9d587e39
A struct with three raw pointers to other GC'd types is a pretty big liability, let's just turn this into a Cell itself. This comes with the additional benefit of being able to capture it in a lambda effortlessly, without having to create handles for individual members.
99 lines
4.3 KiB
C++
99 lines
4.3 KiB
C++
/*
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* Copyright (c) 2021-2022, 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/Error.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/PromiseCapability.h>
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namespace JS {
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NonnullGCPtr<PromiseCapability> PromiseCapability::create(VM& vm, GCPtr<Object> promise, GCPtr<FunctionObject> resolve, GCPtr<FunctionObject> reject)
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{
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return NonnullGCPtr { *vm.heap().allocate_without_realm<PromiseCapability>(promise, resolve, reject) };
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}
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PromiseCapability::PromiseCapability(GCPtr<Object> promise, GCPtr<FunctionObject> resolve, GCPtr<FunctionObject> reject)
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: m_promise(promise)
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, m_resolve(resolve)
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, m_reject(reject)
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{
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}
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void PromiseCapability::visit_edges(Cell::Visitor& visitor)
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{
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visitor.visit(m_promise);
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visitor.visit(m_resolve);
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visitor.visit(m_reject);
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}
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// 27.2.1.5 NewPromiseCapability ( C ), https://tc39.es/ecma262/#sec-newpromisecapability
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ThrowCompletionOr<NonnullGCPtr<PromiseCapability>> new_promise_capability(VM& vm, Value constructor)
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{
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auto& realm = *vm.current_realm();
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// 1. If IsConstructor(C) is false, throw a TypeError exception.
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if (!constructor.is_constructor())
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return vm.throw_completion<TypeError>(ErrorType::NotAConstructor, constructor.to_string_without_side_effects());
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// 2. NOTE: C is assumed to be a constructor function that supports the parameter conventions of the Promise constructor (see 27.2.3.1).
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// 3. Let promiseCapability be the PromiseCapability Record { [[Promise]]: undefined, [[Resolve]]: undefined, [[Reject]]: undefined }.
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// FIXME: This should not be stack-allocated, the executor function below can be captured and outlive it!
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// See https://discord.com/channels/830522505605283862/886211697843531866/900081190621569154 for some discussion.
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struct {
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Value resolve { js_undefined() };
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Value reject { js_undefined() };
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} promise_capability_functions;
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// 4. Let executorClosure be a new Abstract Closure with parameters (resolve, reject) that captures promiseCapability and performs the following steps when called:
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auto executor_closure = [&promise_capability_functions](auto& vm) -> ThrowCompletionOr<Value> {
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auto resolve = vm.argument(0);
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auto reject = vm.argument(1);
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// No idea what other engines say here.
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// a. If promiseCapability.[[Resolve]] is not undefined, throw a TypeError exception.
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if (!promise_capability_functions.resolve.is_undefined())
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return vm.template throw_completion<TypeError>(ErrorType::GetCapabilitiesExecutorCalledMultipleTimes);
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// b. If promiseCapability.[[Reject]] is not undefined, throw a TypeError exception.
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if (!promise_capability_functions.reject.is_undefined())
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return vm.template throw_completion<TypeError>(ErrorType::GetCapabilitiesExecutorCalledMultipleTimes);
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// c. Set promiseCapability.[[Resolve]] to resolve.
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promise_capability_functions.resolve = resolve;
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// d. Set promiseCapability.[[Reject]] to reject.
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promise_capability_functions.reject = reject;
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// e. Return undefined.
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return js_undefined();
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};
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// 5. Let executor be CreateBuiltinFunction(executorClosure, 2, "", « »).
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auto* executor = NativeFunction::create(realm, move(executor_closure), 2, "");
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// 6. Let promise be ? Construct(C, « executor »).
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auto* promise = TRY(construct(vm, constructor.as_function(), executor));
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// 7. If IsCallable(promiseCapability.[[Resolve]]) is false, throw a TypeError exception.
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if (!promise_capability_functions.resolve.is_function())
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return vm.throw_completion<TypeError>(ErrorType::NotAFunction, promise_capability_functions.resolve.to_string_without_side_effects());
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// 8. If IsCallable(promiseCapability.[[Reject]]) is false, throw a TypeError exception.
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if (!promise_capability_functions.reject.is_function())
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return vm.throw_completion<TypeError>(ErrorType::NotAFunction, promise_capability_functions.reject.to_string_without_side_effects());
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// 9. Set promiseCapability.[[Promise]] to promise.
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// 10. Return promiseCapability.
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return PromiseCapability::create(
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vm,
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promise,
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&promise_capability_functions.resolve.as_function(),
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&promise_capability_functions.reject.as_function());
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}
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}
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