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Auto merge of #16652 - davidbarsky:david/deadlock-fix-for-16643, r=Veykril

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internal: fix deadlock introduced by #16643

This fixes a deadlock introduced by #16643 ([backtrace](https://gist.github.com/davidbarsky/00f17598f5496a9c41aff31fec1c42d6)). `maybe_changed_after` calls back into other queries, so the cloning here is unfortunately inevitable.

(Zulip conversation: https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/Fixing.20proc-macro.20dirtying.20with.20unindexed.20projects)
This commit is contained in:
bors 2024-02-23 20:39:13 +00:00
commit 03b3cb6be9
1 changed files with 5 additions and 2 deletions
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7
crates/salsa/src/derived.rs
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@ -146,11 +146,14 @@ where
revision: Revision,
) -> bool {
debug_assert!(revision < db.salsa_runtime().current_revision());
let read = &self.slot_map.read();
let read = self.slot_map.read();
let Some((key, slot)) = read.get_index(index as usize) else {
return false;
};
slot.maybe_changed_after(db, revision, key)
let (key, slot) = (key.clone(), slot.clone());
// note: this drop is load-bearing. removing it would causes deadlocks.
drop(read);
slot.maybe_changed_after(db, revision, &key)
}
fn fetch(&self, db: &<Q as QueryDb<'_>>::DynDb, key: &Q::Key) -> Q::Value {