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Rollup merge of #84923 - estebank:as_cache_key-once, r=petrochenkov

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Only compute Obligation `cache_key` once  in `register_obligation_at`
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Dylan DPC 2021-05-06 13:30:58 +02:00 • committed by GitHub
commit b5f40df95c
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1 changed files with 4 additions and 3 deletions
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7
compiler/rustc_data_structures/src/obligation_forest/mod.rs
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@ -336,12 +336,13 @@ impl<O: ForestObligation> ObligationForest<O> {
// Returns Err(()) if we already know this obligation failed.
fn register_obligation_at(&mut self, obligation: O, parent: Option<usize>) -> Result<(), ()> {
if self.done_cache.contains(&obligation.as_cache_key()) {
let cache_key = obligation.as_cache_key();
if self.done_cache.contains(&cache_key) {
debug!("register_obligation_at: ignoring already done obligation: {:?}", obligation);
return Ok(());
}
match self.active_cache.entry(obligation.as_cache_key()) {
match self.active_cache.entry(cache_key.clone()) {
Entry::Occupied(o) => {
let node = &mut self.nodes[*o.get()];
if let Some(parent_index) = parent {
@ -365,7 +366,7 @@ impl<O: ForestObligation> ObligationForest<O> {
&& self
.error_cache
.get(&obligation_tree_id)
.map(|errors| errors.contains(&obligation.as_cache_key()))
.map(|errors| errors.contains(&cache_key))
.unwrap_or(false);
if already_failed {