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53cac71cec
More work on recovering the performance regression from DeprecatedFlyString removal. Local measurements on my MBP: - 2.5% speedup on Octane/zlib.js - 2% speedup on Octane/typescript.js
55 lines
1.6 KiB
C++
55 lines
1.6 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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void StringBase::replace_with_string_builder(StringBuilder& builder)
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{
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ASSERT(!is_invalid());
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if (builder.length() <= MAX_SHORT_STRING_BYTE_COUNT) {
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return replace_with_new_short_string(builder.length(), [&](Bytes buffer) {
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builder.string_view().bytes().copy_to(buffer);
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});
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}
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destroy_string();
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m_data = &StringData::create_from_string_builder(builder).leak_ref();
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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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ASSERT(!is_invalid());
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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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ASSERT(!is_invalid());
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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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}
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