da65105cd6
Let shaped declarative environments read static binding flags from their EnvironmentShape instead of retaining a per-environment copy. The local flag vector now mirrors the local name vector and only stores dynamic bindings created after the shared shape. Split EnvironmentShape binding descriptors into separate name and flag vectors so the shared metadata is compact as well.
51 lines
1.4 KiB
C++
51 lines
1.4 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/HashMap.h>
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#include <AK/Optional.h>
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#include <AK/Span.h>
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#include <AK/Utf16FlyString.h>
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#include <AK/Vector.h>
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#include <LibGC/Ptr.h>
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#include <LibJS/Export.h>
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#include <LibJS/Heap/Cell.h>
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namespace JS {
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class VM;
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class JS_API EnvironmentShape final : public Cell {
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GC_CELL(EnvironmentShape, Cell);
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GC_DECLARE_ALLOCATOR(EnvironmentShape);
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public:
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enum BindingFlag : u8 {
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BindingFlagStrict = 1 << 0,
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BindingFlagMutable = 1 << 1,
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BindingFlagCanBeDeleted = 1 << 2,
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};
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EnvironmentShape(Vector<Utf16FlyString>, Vector<u8>, HashMap<Utf16FlyString, size_t>);
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virtual ~EnvironmentShape() override = default;
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[[nodiscard]] static GC::Ref<EnvironmentShape> create(VM&, ReadonlySpan<Utf16FlyString> names, ReadonlySpan<u8> flags);
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[[nodiscard]] size_t size() const { return m_binding_names.size(); }
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[[nodiscard]] Utf16FlyString const& binding_name(size_t index) const { return m_binding_names[index]; }
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[[nodiscard]] u8 binding_flags(size_t index) const { return m_binding_flags[index]; }
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[[nodiscard]] Optional<size_t> find_binding(Utf16FlyString const&) const;
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private:
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virtual size_t external_memory_size() const override;
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Vector<Utf16FlyString> m_binding_names;
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Vector<u8> m_binding_flags;
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HashMap<Utf16FlyString, size_t> m_binding_indices;
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};
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}
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