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482b548233
Reserve bytecode tables and executable vectors from FFI counts before filling them during Rust bytecode materialization. This avoids repeated growth for data whose final size is already known.
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
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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/DistinctNumeric.h>
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#include <AK/Utf16String.h>
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#include <AK/Vector.h>
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#include <LibJS/Runtime/ExternalMemory.h>
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namespace JS::Bytecode {
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struct StringTableIndex {
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static constexpr u32 invalid = 0xffffffffu;
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bool is_valid() const { return value != invalid; }
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u32 value { 0 };
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};
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class StringTable {
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AK_MAKE_NONMOVABLE(StringTable);
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AK_MAKE_NONCOPYABLE(StringTable);
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public:
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StringTable() = default;
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StringTableIndex insert(Utf16String);
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Utf16String const& get(StringTableIndex) const;
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void dump() const;
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void ensure_capacity(size_t capacity) { m_strings.ensure_capacity(capacity); }
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bool is_empty() const { return m_strings.is_empty(); }
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size_t size() const { return m_strings.size(); }
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size_t external_memory_size() const
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{
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size_t size = vector_external_memory_size(m_strings);
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for (auto const& string : m_strings)
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size = saturating_add_external_memory_size(size, utf16_string_external_memory_size(string));
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return size;
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}
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private:
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Vector<Utf16String> m_strings;
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};
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}
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namespace AK {
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template<>
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struct SentinelOptionalTraits<JS::Bytecode::StringTableIndex> {
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static constexpr JS::Bytecode::StringTableIndex sentinel_value() { return { JS::Bytecode::StringTableIndex::invalid }; }
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static constexpr bool is_sentinel(JS::Bytecode::StringTableIndex const& value) { return !value.is_valid(); }
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};
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template<>
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class Optional<JS::Bytecode::StringTableIndex> : public SentinelOptional<JS::Bytecode::StringTableIndex> {
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public:
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using SentinelOptional::SentinelOptional;
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};
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}
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