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https://github.com/salsa-rs/salsa.git
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fad97eeb6a
This had two unexpected consequences, one unfortunate, one "medium": * All `salsa::Database` must be `'static`. This falls out from `Q::DynDb` not having access to any lifetimes, but also the defaulting rules for `dyn QueryGroup` that make it `dyn QueryGroup + 'static`. We don't really support generic databases anyway yet so this isn't a big deal, and we can add workarounds later (ideally via GATs). * It is now statically impossible to invoke `snapshot` from a query, and so we don't need to test that it panics. This is because the signature of `snapshot` returns a `Snapshot<Self>` and that is not accessible to a `dyn QueryGroup` type. Similarly, invoking `Runtime::snapshot` directly is not possible becaues it is crate-private. So I removed the test. This seems ok, but eventually I would like to expose ways for queries to do parallel execution (matklad and I had talked about a "speculation" primitive for enabling that). * This commit is 99% boilerplate I did with search-and-replace. I also rolled in a few other changes I might have preferred to factor out, most notably removing the `GetQueryTable` plumbing trait in favor of free-methods, but it was awkward to factor them out and get all the generics right (so much simpler in this version).
96 lines
2.5 KiB
Rust
96 lines
2.5 KiB
Rust
use salsa::{Database, ParallelDatabase, Snapshot};
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use std::panic::{self, AssertUnwindSafe};
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use std::sync::atomic::{AtomicU32, Ordering::SeqCst};
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#[salsa::query_group(PanicSafelyStruct)]
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trait PanicSafelyDatabase: salsa::Database {
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#[salsa::input]
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fn one(&self) -> usize;
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fn panic_safely(&self) -> ();
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fn outer(&self) -> ();
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}
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fn panic_safely(db: &dyn PanicSafelyDatabase) -> () {
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assert_eq!(db.one(), 1);
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}
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static OUTER_CALLS: AtomicU32 = AtomicU32::new(0);
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fn outer(db: &dyn PanicSafelyDatabase) -> () {
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OUTER_CALLS.fetch_add(1, SeqCst);
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db.panic_safely();
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}
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#[salsa::database(PanicSafelyStruct)]
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#[derive(Default)]
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struct DatabaseStruct {
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storage: salsa::Storage<Self>,
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}
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impl salsa::Database for DatabaseStruct {}
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impl salsa::ParallelDatabase for DatabaseStruct {
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fn snapshot(&self) -> Snapshot<Self> {
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Snapshot::new(DatabaseStruct {
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storage: self.storage.snapshot(),
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})
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}
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}
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#[test]
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fn should_panic_safely() {
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let mut db = DatabaseStruct::default();
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db.set_one(0);
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// Invoke `db.panic_safely() without having set `db.one`. `db.one` will
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// return 0 and we should catch the panic.
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let result = panic::catch_unwind(AssertUnwindSafe({
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let db = db.snapshot();
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move || db.panic_safely()
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}));
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assert!(result.is_err());
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// Set `db.one` to 1 and assert ok
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db.set_one(1);
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let result = panic::catch_unwind(AssertUnwindSafe(|| db.panic_safely()));
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assert!(result.is_ok());
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// Check, that memoized outer is not invalidated by a panic
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{
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assert_eq!(OUTER_CALLS.load(SeqCst), 0);
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db.outer();
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assert_eq!(OUTER_CALLS.load(SeqCst), 1);
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db.set_one(0);
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let result = panic::catch_unwind(AssertUnwindSafe(|| db.outer()));
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assert!(result.is_err());
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assert_eq!(OUTER_CALLS.load(SeqCst), 1);
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db.set_one(1);
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db.outer();
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assert_eq!(OUTER_CALLS.load(SeqCst), 1);
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}
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}
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#[test]
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fn storages_are_unwind_safe() {
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fn check_unwind_safe<T: std::panic::UnwindSafe>() {}
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check_unwind_safe::<&DatabaseStruct>();
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}
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#[test]
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fn panics_clear_query_stack() {
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let db = DatabaseStruct::default();
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// Invoke `db.panic_if_not_one() without having set `db.input`. `db.input`
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// will default to 0 and we should catch the panic.
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let result = panic::catch_unwind(AssertUnwindSafe(|| db.panic_safely()));
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assert!(result.is_err());
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// The database has been poisoned and any attempt to increment the
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// revision should panic.
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assert_eq!(db.salsa_runtime().active_query(), None);
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}
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