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LibJS: Add Token::flystring_value() to produce FlyString directly

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When parsing identifiers, we ultimately want to sink the token string
into a FlyString anyway, and since Token may have a FlyString already
inside it, this allows us to bypass the costly FlyString(StringView).

This gives a ~3% speedup when parsing the largest Discord JS file.
This commit is contained in:
Andreas Kling 2022-02-13 13:22:12 +01:00
parent 515594c667
commit 0cb0979990
2 changed files with 20 additions and 11 deletions
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9
Userland/Libraries/LibJS/Token.h
View file

@ -210,6 +210,15 @@ public:
[](FlyString const& identifier) { return identifier.view(); },
[](Empty) -> StringView { VERIFY_NOT_REACHED(); });
}
FlyString flystring_value() const
{
return m_value.visit(
[](StringView view) -> FlyString { return view; },
[](FlyString const& identifier) -> FlyString { return identifier; },
[](Empty) -> FlyString { VERIFY_NOT_REACHED(); });
}
StringView filename() const { return m_filename; }
size_t line_number() const { return m_line_number; }
size_t line_column() const { return m_line_column; }