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syntax_pos: Optimize symbol interner pre-filling slightly

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This commit is contained in:
Vadim Petrochenkov 2019-05-10 16:57:15 +03:00
parent 0ac53da03d
commit aeee1fb1f2
1 changed files with 10 additions and 9 deletions
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19
src/libsyntax_pos/symbol.rs
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@ -453,15 +453,16 @@ pub struct Interner {
impl Interner {
fn prefill(init: &[&str]) -> Self {
let mut this = Interner::default();
for &string in init {
if string == "" {
// We can't allocate empty strings in the arena, so handle this here.
let name = Symbol::new(this.strings.len() as u32);
this.names.insert("", name);
this.strings.push("");
} else {
this.intern(string);
}
this.names.reserve(init.len());
this.strings.reserve(init.len());
// We can't allocate empty strings in the arena, so handle this here.
assert!(keywords::Invalid.name().as_u32() == 0 && init[0].is_empty());
this.names.insert("", keywords::Invalid.name());
this.strings.push("");
for string in &init[1..] {
this.intern(string);
}
this
}