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Auto merge of #60700 - petrochenkov:preintern, r=nnethercote

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syntax_pos: Optimize symbol interner pre-filling slightly

r? @nnethercote
This commit is contained in:
bors 2019-05-11 06:42:36 +00:00
commit b8e0d0a2aa
1 changed files with 10 additions and 9 deletions
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19
src/libsyntax_pos/symbol.rs
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@ -463,15 +463,16 @@ 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
}