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LibJS+AK: Use Vector<u16, 1> for UTF-16 string storage

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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.
This commit is contained in:
Andreas Kling 2021-10-02 17:37:15 +02:00
parent ae0bdda86e
commit 024367d82e
7 changed files with 27 additions and 26 deletions
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12
Userland/Libraries/LibJS/Runtime/Utf16String.h
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@ -20,18 +20,18 @@ public:
~Utf16StringImpl() = default;
static NonnullRefPtr<Utf16StringImpl> create();
static NonnullRefPtr<Utf16StringImpl> create(Vector<u16>);
static NonnullRefPtr<Utf16StringImpl> create(Vector<u16, 1>);
static NonnullRefPtr<Utf16StringImpl> create(StringView const&);
static NonnullRefPtr<Utf16StringImpl> create(Utf16View const&);
Vector<u16> const& string() const;
Vector<u16, 1> const& string() const;
Utf16View view() const;
private:
Utf16StringImpl() = default;
explicit Utf16StringImpl(Vector<u16> string);
explicit Utf16StringImpl(Vector<u16, 1> string);
Vector<u16> m_string;
Vector<u16, 1> m_string;
};
}
@ -39,11 +39,11 @@ private:
class Utf16String {
public:
Utf16String();
explicit Utf16String(Vector<u16>);
explicit Utf16String(Vector<u16, 1>);
explicit Utf16String(StringView const&);
explicit Utf16String(Utf16View const&);
Vector<u16> const& string() const;
Vector<u16, 1> const& string() const;
Utf16View view() const;
Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const;
Utf16View substring_view(size_t code_unit_offset) const;