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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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13
AK/Utf16View.cpp
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@ -21,9 +21,10 @@ static constexpr u32 replacement_code_point = 0xfffd;
static constexpr u32 first_supplementary_plane_code_point = 0x10000;
template<typename UtfViewType>
static Vector<u16> to_utf16_impl(UtfViewType const& view) requires(IsSame<UtfViewType, Utf8View> || IsSame<UtfViewType, Utf32View>)
static Vector<u16, 1> to_utf16_impl(UtfViewType const& view) requires(IsSame<UtfViewType, Utf8View> || IsSame<UtfViewType, Utf32View>)
{
Vector<u16> utf16_data;
Vector<u16, 1> utf16_data;
utf16_data.ensure_capacity(view.length());
for (auto code_point : view)
code_point_to_utf16(utf16_data, code_point);
@ -31,22 +32,22 @@ static Vector<u16> to_utf16_impl(UtfViewType const& view) requires(IsSame<UtfVie
return utf16_data;
}
Vector<u16> utf8_to_utf16(StringView const& utf8_view)
Vector<u16, 1> utf8_to_utf16(StringView const& utf8_view)
{
return to_utf16_impl(Utf8View { utf8_view });
}
Vector<u16> utf8_to_utf16(Utf8View const& utf8_view)
Vector<u16, 1> utf8_to_utf16(Utf8View const& utf8_view)
{
return to_utf16_impl(utf8_view);
}
Vector<u16> utf32_to_utf16(Utf32View const& utf32_view)
Vector<u16, 1> utf32_to_utf16(Utf32View const& utf32_view)
{
return to_utf16_impl(utf32_view);
}
void code_point_to_utf16(Vector<u16>& string, u32 code_point)
void code_point_to_utf16(Vector<u16, 1>& string, u32 code_point)
{
VERIFY(is_unicode(code_point));