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d01d6ed511
Now, the effect of GC is a "product" of three parameters: * what values are affected (everything/everything except used) * are we removing values * are we removing deps SweepStrategy::default is now a no-op GC.
89 lines
2 KiB
Rust
89 lines
2 KiB
Rust
use crate::db;
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use crate::group::{FibonacciQuery, GcDatabase};
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use salsa::debug::DebugQueryTable;
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use salsa::{Database, SweepStrategy};
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// For constant values (like `fibonacci`), we only keep the values
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// that were used in the latest revision, not the sub-values that
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// they required to be computed.
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#[test]
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fn one_rev() {
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let db = db::DatabaseImpl::default();
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db.fibonacci(5);
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let k: Vec<_> = db.query(FibonacciQuery).entries();
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assert_eq!(k.len(), 6);
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// Everything was used in this revision, so
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// nothing gets collected.
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db.sweep_all(SweepStrategy::discard_old());
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assert_eq!(k.len(), 6);
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}
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#[test]
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fn two_rev_nothing() {
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let db = db::DatabaseImpl::default();
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db.fibonacci(5);
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let k: Vec<_> = db.query(FibonacciQuery).entries();
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assert_eq!(k.len(), 6);
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db.salsa_runtime().next_revision();
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// Nothing was used in this revision, so
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// everything gets collected.
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db.sweep_all(SweepStrategy::discard_old());
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let k: Vec<_> = db.query(FibonacciQuery).entries();
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assert_eq!(k.len(), 0);
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}
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#[test]
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fn two_rev_one_use() {
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let db = db::DatabaseImpl::default();
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db.fibonacci(5);
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let k: Vec<_> = db.query(FibonacciQuery).entries();
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assert_eq!(k.len(), 6);
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db.salsa_runtime().next_revision();
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db.fibonacci(5);
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// fibonacci is a constant, so it will not be invalidated,
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// hence we keep `fibonacci(5)` but remove 0..=4.
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db.sweep_all(SweepStrategy::discard_old());
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assert_keys! {
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db,
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FibonacciQuery => (5),
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}
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}
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#[test]
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fn two_rev_two_uses() {
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let db = db::DatabaseImpl::default();
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db.fibonacci(5);
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let k: Vec<_> = db.query(FibonacciQuery).entries();
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assert_eq!(k.len(), 6);
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db.salsa_runtime().next_revision();
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db.fibonacci(5);
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db.fibonacci(3);
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// fibonacci is a constant, so it will not be invalidated,
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// hence we keep 3 and 5 but remove the rest.
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db.sweep_all(SweepStrategy::discard_old());
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assert_keys! {
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db,
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FibonacciQuery => (3, 5),
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}
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}
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