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rustc_span: use IndexSet in SpanInterner

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This commit is contained in:
Josh Stone 2020-08-07 20:50:53 -07:00
parent 4efc7e92fa
commit 7d1547d300
1 changed files with 5 additions and 12 deletions
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17
src/librustc_span/span_encoding.rs
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@ -8,7 +8,7 @@ use crate::hygiene::SyntaxContext;
use crate::SESSION_GLOBALS;
use crate::{BytePos, SpanData};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::fx::FxIndexSet;
/// A compressed span.
///
@ -111,25 +111,18 @@ impl Span {
#[derive(Default)]
pub struct SpanInterner {
spans: FxHashMap<SpanData, u32>,
span_data: Vec<SpanData>,
spans: FxIndexSet<SpanData>,
}
impl SpanInterner {
fn intern(&mut self, span_data: &SpanData) -> u32 {
if let Some(index) = self.spans.get(span_data) {
return *index;
}
let index = self.spans.len() as u32;
self.span_data.push(*span_data);
self.spans.insert(*span_data, index);
index
let (index, _) = self.spans.insert_full(*span_data);
index as u32
}
#[inline]
fn get(&self, index: u32) -> &SpanData {
&self.span_data[index as usize]
&self.spans[index as usize]
}
}