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a88799c032
Before this change, the global FlyString table looked like this:
HashMap<StringView, Detail::StringBase>
After this change, we have:
HashTable<Detail::StringData const*, FlyStringTableHashTraits>
The custom hash traits are used to extract the stored hash from
StringData which avoids having to rehash the StringView repeatedly like
we did before.
This necessitated a handful of smaller changes to make it work.
125 lines
3.0 KiB
C++
125 lines
3.0 KiB
C++
/*
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* Copyright (c) 2023, Dan Klishch <danilklishch@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Badge.h>
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#include <AK/FlyString.h>
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#include <AK/StringBase.h>
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#include <AK/StringData.h>
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namespace AK::Detail {
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ReadonlyBytes ShortString::bytes() const
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{
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return { storage, byte_count() };
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}
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size_t ShortString::byte_count() const
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{
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return byte_count_and_short_string_flag >> 1;
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}
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StringBase::StringBase(NonnullRefPtr<Detail::StringData const> data)
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: m_data(&data.leak_ref())
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{
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}
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StringBase::StringBase(StringBase const& other)
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: m_data(other.m_data)
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{
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if (!is_short_string())
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m_data->ref();
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}
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StringBase& StringBase::operator=(StringBase&& other)
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{
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if (!is_short_string())
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m_data->unref();
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m_data = exchange(other.m_data, nullptr);
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other.m_short_string.byte_count_and_short_string_flag = SHORT_STRING_FLAG;
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return *this;
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}
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StringBase& StringBase::operator=(StringBase const& other)
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{
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if (&other != this) {
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if (!is_short_string())
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m_data->unref();
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m_data = other.m_data;
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if (!is_short_string())
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m_data->ref();
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}
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return *this;
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}
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ReadonlyBytes StringBase::bytes() const
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{
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if (is_short_string())
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return m_short_string.bytes();
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return m_data->bytes();
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}
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u32 StringBase::hash() const
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{
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if (is_short_string()) {
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auto bytes = this->bytes();
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return string_hash(reinterpret_cast<char const*>(bytes.data()), bytes.size());
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}
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return m_data->hash();
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}
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size_t StringBase::byte_count() const
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{
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if (is_short_string())
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return m_short_string.byte_count_and_short_string_flag >> 1;
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return m_data->byte_count();
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}
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bool StringBase::operator==(StringBase const& other) const
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{
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if (is_short_string())
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return m_data == other.m_data;
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if (other.is_short_string())
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return false;
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if (m_data->is_fly_string() && other.m_data->is_fly_string())
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return m_data == other.m_data;
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return bytes() == other.bytes();
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}
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ErrorOr<Bytes> StringBase::replace_with_uninitialized_buffer(size_t byte_count)
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{
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if (byte_count <= MAX_SHORT_STRING_BYTE_COUNT)
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return replace_with_uninitialized_short_string(byte_count);
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u8* buffer = nullptr;
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destroy_string();
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m_data = &TRY(StringData::create_uninitialized(byte_count, buffer)).leak_ref();
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return Bytes { buffer, byte_count };
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}
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ErrorOr<StringBase> StringBase::substring_from_byte_offset_with_shared_superstring(size_t start, size_t length) const
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{
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VERIFY(start + length <= byte_count());
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if (length == 0)
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return StringBase {};
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if (length <= MAX_SHORT_STRING_BYTE_COUNT) {
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StringBase result;
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bytes().slice(start, length).copy_to(result.replace_with_uninitialized_short_string(length));
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return result;
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}
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return StringBase { TRY(Detail::StringData::create_substring(*m_data, start, length)) };
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}
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void StringBase::destroy_string()
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{
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if (!is_short_string())
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m_data->unref();
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}
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}
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