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29879a69a4
Currently, invoking StringBuilder::to_string will re-allocate the string data to construct the String. This is wasteful both in terms of memory and speed. The goal here is to simply hand the string buffer over to String, and let String take ownership of that buffer. To do this, StringBuilder must have the same memory layout as Detail::StringData. This layout is just the members of the StringData class followed by the string itself. So when a StringBuilder is created, we reserve sizeof(StringData) bytes at the front of the buffer. StringData can then construct itself into the buffer with placement new. Things to note: * StringData must now be aware of the actual capacity of its buffer, as that can be larger than the string size. * We must take care not to pass ownership of inlined string buffers, as these live on the stack.
205 lines
4.3 KiB
C++
205 lines
4.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@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/DefaultDelete.h>
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#include <AK/SinglyLinkedListSizePolicy.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Types.h>
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namespace AK {
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namespace Detail {
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template<size_t inline_capacity>
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class ByteBuffer;
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class StringData;
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}
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enum class TrailingCodePointTransformation : u8;
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class BigEndianInputBitStream;
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class BigEndianOutputBitStream;
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class Bitmap;
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using ByteBuffer = Detail::ByteBuffer<32>;
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class CircularBuffer;
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class ConstrainedStream;
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class CountingStream;
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class DeprecatedFlyString;
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class ByteString;
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class DeprecatedStringCodePointIterator;
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class Duration;
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class Error;
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class FlyString;
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class GenericLexer;
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class IPv4Address;
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class IPv6Address;
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class JsonArray;
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class JsonObject;
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class JsonValue;
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class LexicalPath;
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class LittleEndianInputBitStream;
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class LittleEndianOutputBitStream;
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class SearchableCircularBuffer;
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class SeekableStream;
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class StackInfo;
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class Stream;
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class String;
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class StringBuilder;
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class StringImpl;
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class StringView;
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class UnixDateTime;
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class Utf16View;
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class Utf32CodePointIterator;
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class Utf32View;
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class Utf8CodePointIterator;
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class Utf8View;
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template<typename T>
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class Span;
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template<typename T, size_t Size>
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struct Array;
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template<typename Container, typename ValueType>
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class SimpleIterator;
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template<typename T>
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using ReadonlySpan = Span<T const>;
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using ReadonlyBytes = ReadonlySpan<u8>;
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using Bytes = Span<u8>;
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template<typename T, AK::MemoryOrder DefaultMemoryOrder>
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class Atomic;
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template<typename T, typename TSizeCalculationPolicy = DefaultSizeCalculationPolicy>
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class SinglyLinkedList;
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template<typename T>
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class DoublyLinkedList;
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template<typename T, size_t capacity>
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class CircularQueue;
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template<typename T>
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struct Traits;
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template<typename T, typename TraitsForT = Traits<T>, bool IsOrdered = false>
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class HashTable;
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template<typename T, typename TraitsForT = Traits<T>>
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using OrderedHashTable = HashTable<T, TraitsForT, true>;
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template<typename K, typename V, typename KeyTraits = Traits<K>, typename ValueTraits = Traits<V>, bool IsOrdered = false>
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class HashMap;
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template<typename K, typename V, typename KeyTraits = Traits<K>, typename ValueTraits = Traits<V>>
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using OrderedHashMap = HashMap<K, V, KeyTraits, ValueTraits, true>;
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template<typename T>
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class Badge;
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template<typename T>
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class FixedArray;
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template<size_t precision, typename Underlying = i32>
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class FixedPoint;
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template<typename>
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class Function;
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template<typename Out, typename... In>
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class Function<Out(In...)>;
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template<typename T>
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class NonnullRefPtr;
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template<typename T>
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class NonnullOwnPtr;
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template<typename T>
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class Optional;
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template<typename T>
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class RefPtr;
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template<typename T, typename TDeleter = DefaultDelete<T>>
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class OwnPtr;
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template<typename T>
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class WeakPtr;
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template<typename T, size_t inline_capacity = 0>
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requires(!IsRvalueReference<T>) class Vector;
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template<typename T, typename ErrorType = Error>
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class [[nodiscard]] ErrorOr;
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}
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#if USING_AK_GLOBALLY
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using AK::Array;
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using AK::Atomic;
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using AK::Badge;
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using AK::BigEndianInputBitStream;
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using AK::BigEndianOutputBitStream;
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using AK::Bitmap;
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using AK::ByteBuffer;
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using AK::Bytes;
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using AK::ByteString;
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using AK::CircularBuffer;
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using AK::CircularQueue;
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using AK::ConstrainedStream;
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using AK::CountingStream;
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using AK::DeprecatedFlyString;
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using AK::DeprecatedStringCodePointIterator;
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using AK::DoublyLinkedList;
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using AK::Error;
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using AK::ErrorOr;
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using AK::FixedArray;
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using AK::FlyString;
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using AK::Function;
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using AK::GenericLexer;
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using AK::HashMap;
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using AK::HashTable;
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using AK::IPv4Address;
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using AK::IPv6Address;
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using AK::JsonArray;
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using AK::JsonObject;
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using AK::JsonValue;
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using AK::LexicalPath;
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using AK::LittleEndianInputBitStream;
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using AK::LittleEndianOutputBitStream;
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using AK::NonnullOwnPtr;
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using AK::NonnullRefPtr;
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using AK::Optional;
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using AK::OwnPtr;
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using AK::ReadonlyBytes;
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using AK::RefPtr;
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using AK::SearchableCircularBuffer;
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using AK::SeekableStream;
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using AK::SinglyLinkedList;
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using AK::Span;
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using AK::StackInfo;
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using AK::Stream;
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using AK::String;
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using AK::StringBuilder;
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using AK::StringImpl;
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using AK::StringView;
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using AK::TrailingCodePointTransformation;
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using AK::Traits;
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using AK::UnixDateTime;
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using AK::Utf16View;
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using AK::Utf32CodePointIterator;
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using AK::Utf32View;
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using AK::Utf8CodePointIterator;
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using AK::Utf8View;
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using AK::Vector;
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#endif
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