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https://github.com/LadybirdBrowser/ladybird.git
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40be311e42
Keep a compact enum-index-to-entry-index vector beside the hash-sorted entry storage. This preserves the sorted lookup layout while letting insertion-order enumeration walk the visible descriptor prefix directly.
69 lines
2 KiB
C++
69 lines
2 KiB
C++
/*
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* Copyright (c) 2026-present, the Ladybird developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/NumericLimits.h>
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#include <AK/Vector.h>
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#include <LibJS/Export.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Runtime/PropertyAttributes.h>
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#include <LibJS/Runtime/PropertyKey.h>
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namespace JS {
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struct PropertyMetadata {
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u32 offset { 0 };
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PropertyAttributes attributes { 0 };
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};
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class JS_API DescriptorArray final : public Cell {
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GC_CELL(DescriptorArray, Cell);
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GC_DECLARE_ALLOCATOR(DescriptorArray);
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public:
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struct Entry {
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PropertyKey property_key;
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u32 offset { 0 };
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u16 attributes { 0 };
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u16 enum_index { 0 };
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PropertyMetadata metadata() const
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{
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return { offset, static_cast<u8>(attributes) };
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}
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};
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static constexpr u32 max_descriptor_count = NumericLimits<u16>::max() + 1;
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DescriptorArray() = default;
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explicit DescriptorArray(DescriptorArray const&, u32 descriptor_count);
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virtual ~DescriptorArray() override = default;
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[[nodiscard]] u32 size() const { return m_entries.size(); }
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[[nodiscard]] Optional<PropertyMetadata> lookup(PropertyKey const&, u32 descriptor_count) const;
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void set(PropertyKey const&, PropertyMetadata, u32 enum_index);
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void set_attributes(PropertyKey const&, PropertyAttributes, u32 descriptor_count);
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void remove(PropertyKey const&, u32 descriptor_count);
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void for_each_in_insertion_order(Function<void(PropertyKey const&, PropertyMetadata const&)> const&, u32 descriptor_count) const;
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private:
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virtual void visit_edges(Visitor&) override;
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virtual size_t external_memory_size() const override;
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[[nodiscard]] Optional<size_t> find(PropertyKey const&, u32 descriptor_count) const;
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[[nodiscard]] size_t find_insertion_index(PropertyKey const&) const;
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Vector<Entry> m_entries;
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Vector<u32> m_entry_indices_by_enum_index;
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};
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static_assert(sizeof(DescriptorArray::Entry) == 16);
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}
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