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LibJS: Add a simple reference-counted UTF-16 string
To help alleviate memory usage when creating and copying large strings, create a simple wrapper around a Vector<u16> to reference count UTF-16 strings.
This commit is contained in:
parent
3322efd4cd
commit
02e7dceb96
Notes:
sideshowbarker
2024-07-18 07:08:41 +09:00
Author: https://github.com/trflynn89 Commit: https://github.com/SerenityOS/serenity/commit/02e7dceb96a Pull-request: https://github.com/SerenityOS/serenity/pull/9320 Reviewed-by: https://github.com/davidot ✅
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@ -157,6 +157,7 @@ set(SOURCES
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Runtime/TypedArray.cpp
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Runtime/TypedArrayConstructor.cpp
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Runtime/TypedArrayPrototype.cpp
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Runtime/Utf16String.cpp
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Runtime/Value.cpp
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Runtime/VM.cpp
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Runtime/WeakContainer.cpp
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@ -169,6 +169,7 @@ class Statement;
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class StringOrSymbol;
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class Symbol;
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class Token;
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class Utf16String;
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class VM;
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class Value;
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class WeakContainer;
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120
Userland/Libraries/LibJS/Runtime/Utf16String.cpp
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120
Userland/Libraries/LibJS/Runtime/Utf16String.cpp
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@ -0,0 +1,120 @@
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/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <AK/Utf16View.h>
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#include <LibJS/Runtime/Utf16String.h>
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namespace JS {
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namespace Detail {
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static NonnullRefPtr<Utf16StringImpl> the_empty_utf16_string()
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{
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static NonnullRefPtr<Utf16StringImpl> empty_string = Utf16StringImpl::create();
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return empty_string;
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}
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Utf16StringImpl::Utf16StringImpl(Vector<u16> string)
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: m_string(move(string))
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{
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create()
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{
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return adopt_ref(*new Utf16StringImpl());
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(Vector<u16> string)
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{
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return adopt_ref(*new Utf16StringImpl(move(string)));
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(StringView const& string)
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{
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return create(AK::utf8_to_utf16(string));
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(Utf16View const& view)
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{
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Vector<u16> string;
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string.ensure_capacity(view.length_in_code_units());
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string.append(view.data(), view.length_in_code_units());
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return create(move(string));
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}
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Vector<u16> const& Utf16StringImpl::string() const
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{
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return m_string;
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}
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Utf16View Utf16StringImpl::view() const
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{
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return Utf16View { m_string };
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}
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}
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Utf16String::Utf16String()
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: m_string(Detail::the_empty_utf16_string())
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{
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}
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Utf16String::Utf16String(Vector<u16> string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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Utf16String::Utf16String(StringView const& string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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Utf16String::Utf16String(Utf16View const& string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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Vector<u16> const& Utf16String::string() const
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{
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return m_string->string();
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}
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Utf16View Utf16String::view() const
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{
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return m_string->view();
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}
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Utf16View Utf16String::substring_view(size_t code_unit_offset, size_t code_unit_length) const
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{
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return view().substring_view(code_unit_offset, code_unit_length);
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}
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Utf16View Utf16String::substring_view(size_t code_unit_offset) const
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{
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return view().substring_view(code_unit_offset);
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}
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String Utf16String::to_utf8() const
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{
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return view().to_utf8(Utf16View::AllowInvalidCodeUnits::Yes);
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}
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u16 Utf16String::code_unit_at(size_t index) const
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{
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return view().code_unit_at(index);
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}
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size_t Utf16String::length_in_code_units() const
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{
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return view().length_in_code_units();
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}
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bool Utf16String::is_empty() const
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{
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return view().is_empty();
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}
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}
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61
Userland/Libraries/LibJS/Runtime/Utf16String.h
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61
Userland/Libraries/LibJS/Runtime/Utf16String.h
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@ -0,0 +1,61 @@
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/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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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/NonnullRefPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace JS {
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namespace Detail {
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class Utf16StringImpl : public RefCounted<Utf16StringImpl> {
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public:
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~Utf16StringImpl() = default;
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static NonnullRefPtr<Utf16StringImpl> create();
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static NonnullRefPtr<Utf16StringImpl> create(Vector<u16>);
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static NonnullRefPtr<Utf16StringImpl> create(StringView const&);
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static NonnullRefPtr<Utf16StringImpl> create(Utf16View const&);
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Vector<u16> const& string() const;
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Utf16View view() const;
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private:
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Utf16StringImpl() = default;
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explicit Utf16StringImpl(Vector<u16> string);
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Vector<u16> m_string;
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};
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}
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class Utf16String {
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public:
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Utf16String();
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explicit Utf16String(Vector<u16>);
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explicit Utf16String(StringView const&);
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explicit Utf16String(Utf16View const&);
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Vector<u16> const& string() const;
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Utf16View view() const;
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Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const;
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Utf16View substring_view(size_t code_unit_offset) const;
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String to_utf8() const;
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u16 code_unit_at(size_t index) const;
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size_t length_in_code_units() const;
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bool is_empty() const;
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private:
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NonnullRefPtr<Detail::Utf16StringImpl> m_string;
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};
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}
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