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LibJS: Make async functions & generators faster with helper types

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Instead of returning internal generator results as ordinary JS::Objects
with properties, we now use GeneratorResult and CompletionCell which
both inherit from Cell directly and allow efficient access to state.

1.59x speedup on JetStream3/lazy-collections.js :^)
This commit is contained in:
Andreas Kling 2025-03-31 09:32:39 +01:00 • committed by Alexander Kalenik
commit a0bb31f7a0
Notes: github-actions[bot] 2025-04-01 00:31:35 +00:00
12 changed files with 259 additions and 93 deletions
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22
Libraries/LibJS/Runtime/GeneratorResult.cpp Normal file
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/*
* Copyright (c) 2025, Andreas Kling <andreas@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/GeneratorResult.h>
namespace JS {
GC_DEFINE_ALLOCATOR(GeneratorResult);
GeneratorResult::~GeneratorResult() = default;
void GeneratorResult::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_result);
visitor.visit(m_continuation);
}
}