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https://github.com/LadybirdBrowser/ladybird
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4182952090
Every Promise allocates two PromiseResolvingFunction cells (resolve and reject). Each cell stored an AK::Function holding a closure, but neither closure captured anything beyond the Promise and AlreadyResolved already present as cell fields. Hoist the two closure bodies into static functions on Promise and dispatch by a Kind enum on the cell. This removes the AK::Function storage embedded in each cell along with its off-GC malloc'd closure capture.
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
/*
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* Copyright (c) 2021-2023, 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/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/Promise.h>
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#include <LibJS/Runtime/PromiseResolvingFunction.h>
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namespace JS {
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GC_DEFINE_ALLOCATOR(AlreadyResolved);
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GC_DEFINE_ALLOCATOR(PromiseResolvingFunction);
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GC::Ref<PromiseResolvingFunction> PromiseResolvingFunction::create(Realm& realm, Promise& promise, AlreadyResolved& already_resolved, Kind kind)
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{
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return realm.create<PromiseResolvingFunction>(promise, already_resolved, kind, realm.intrinsics().function_prototype());
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}
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PromiseResolvingFunction::PromiseResolvingFunction(Promise& promise, AlreadyResolved& already_resolved, Kind kind, Object& prototype)
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: NativeFunction(prototype)
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, m_promise(promise)
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, m_already_resolved(already_resolved)
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, m_kind(kind)
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{
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}
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void PromiseResolvingFunction::initialize(Realm& realm)
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{
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Base::initialize(realm);
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define_direct_property(vm().names.length, Value(1), Attribute::Configurable);
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}
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ThrowCompletionOr<Value> PromiseResolvingFunction::call()
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{
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switch (m_kind) {
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case Kind::Resolve:
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return Promise::resolve_function_steps(vm(), m_promise, m_already_resolved);
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case Kind::Reject:
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return Promise::reject_function_steps(vm(), m_promise, m_already_resolved);
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}
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VERIFY_NOT_REACHED();
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}
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void PromiseResolvingFunction::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_promise);
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visitor.visit(m_already_resolved);
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}
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}
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