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LibJS+AK: Use Vector<u16, 1> for UTF-16 string storage
It's very common to encounter single-character strings in JavaScript on the web. We can make such strings significantly lighter by having a 1-character inline capacity on the Vectors.
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parent
ae0bdda86e
commit
024367d82e
7 changed files with 27 additions and 26 deletions
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@ -140,7 +140,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_char_code)
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// 22.1.2.2 String.fromCodePoint ( ...codePoints ), https://tc39.es/ecma262/#sec-string.fromcodepoint
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JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_code_point)
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{
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Vector<u16> string;
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Vector<u16, 1> string;
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string.ensure_capacity(vm.argument_count()); // This will be an under-estimate if any code point is > 0xffff.
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for (size_t i = 0; i < vm.argument_count(); ++i) {
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@ -17,7 +17,7 @@ static NonnullRefPtr<Utf16StringImpl> the_empty_utf16_string()
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return empty_string;
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}
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Utf16StringImpl::Utf16StringImpl(Vector<u16> string)
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Utf16StringImpl::Utf16StringImpl(Vector<u16, 1> string)
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: m_string(move(string))
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{
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}
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@ -27,7 +27,7 @@ NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create()
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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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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(Vector<u16, 1> string)
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{
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return adopt_ref(*new Utf16StringImpl(move(string)));
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}
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@ -39,13 +39,13 @@ NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(StringView const& string)
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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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Vector<u16, 1> 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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Vector<u16, 1> const& Utf16StringImpl::string() const
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{
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return m_string;
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}
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@ -62,7 +62,7 @@ Utf16String::Utf16String()
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{
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}
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Utf16String::Utf16String(Vector<u16> string)
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Utf16String::Utf16String(Vector<u16, 1> string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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@ -77,7 +77,7 @@ Utf16String::Utf16String(Utf16View const& string)
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{
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}
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Vector<u16> const& Utf16String::string() const
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Vector<u16, 1> const& Utf16String::string() const
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{
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return m_string->string();
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}
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@ -20,18 +20,18 @@ 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(Vector<u16, 1>);
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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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Vector<u16, 1> 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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explicit Utf16StringImpl(Vector<u16, 1> string);
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Vector<u16> m_string;
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Vector<u16, 1> m_string;
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};
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}
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@ -39,11 +39,11 @@ private:
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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(Vector<u16, 1>);
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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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Vector<u16, 1> 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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