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Speed up Token::{ident,lifetime}.

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They're hot enough that the repeated matching done by `uninterpolate`
has a measurable effect.
This commit is contained in:
Nicholas Nethercote 2022-05-03 12:40:35 +10:00
parent baaa3b6829
commit 637a93cb5d
1 changed files with 16 additions and 6 deletions
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22
compiler/rustc_ast/src/token.rs
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@ -475,19 +475,29 @@ impl Token {
}
/// Returns an identifier if this token is an identifier.
#[inline]
pub fn ident(&self) -> Option<(Ident, /* is_raw */ bool)> {
let token = self.uninterpolate();
match token.kind {
Ident(name, is_raw) => Some((Ident::new(name, token.span), is_raw)),
// We avoid using `Token::uninterpolate` here because it's slow.
match &self.kind {
&Ident(name, is_raw) => Some((Ident::new(name, self.span), is_raw)),
Interpolated(nt) => match **nt {
NtIdent(ident, is_raw) => Some((ident, is_raw)),
_ => None,
},
_ => None,
}
}
/// Returns a lifetime identifier if this token is a lifetime.
#[inline]
pub fn lifetime(&self) -> Option<Ident> {
let token = self.uninterpolate();
match token.kind {
Lifetime(name) => Some(Ident::new(name, token.span)),
// We avoid using `Token::uninterpolate` here because it's slow.
match &self.kind {
&Lifetime(name) => Some(Ident::new(name, self.span)),
Interpolated(nt) => match **nt {
NtLifetime(ident) => Some(ident),
_ => None,
},
_ => None,
}
}