salsa/tests/gc/shallow_constant_tests.rs
2019-01-27 17:14:57 +03:00

89 lines
2 KiB
Rust

use crate::db;
use crate::group::{FibonacciQuery, GcDatabase};
use salsa::debug::DebugQueryTable;
use salsa::{Database, SweepStrategy};
// For constant values (like `fibonacci`), we only keep the values
// that were used in the latest revision, not the sub-values that
// they required to be computed.
#[test]
fn one_rev() {
let db = db::DatabaseImpl::default();
db.fibonacci(5);
let k: Vec<_> = db.query(FibonacciQuery).entries();
assert_eq!(k.len(), 6);
// Everything was used in this revision, so
// nothing gets collected.
db.sweep_all(SweepStrategy::discard_outdated());
assert_eq!(k.len(), 6);
}
#[test]
fn two_rev_nothing() {
let db = db::DatabaseImpl::default();
db.fibonacci(5);
let k: Vec<_> = db.query(FibonacciQuery).entries();
assert_eq!(k.len(), 6);
db.salsa_runtime().next_revision();
// Nothing was used in this revision, so
// everything gets collected.
db.sweep_all(SweepStrategy::discard_outdated());
let k: Vec<_> = db.query(FibonacciQuery).entries();
assert_eq!(k.len(), 0);
}
#[test]
fn two_rev_one_use() {
let db = db::DatabaseImpl::default();
db.fibonacci(5);
let k: Vec<_> = db.query(FibonacciQuery).entries();
assert_eq!(k.len(), 6);
db.salsa_runtime().next_revision();
db.fibonacci(5);
// fibonacci is a constant, so it will not be invalidated,
// hence we keep `fibonacci(5)` but remove 0..=4.
db.sweep_all(SweepStrategy::discard_outdated());
assert_keys! {
db,
FibonacciQuery => (5),
}
}
#[test]
fn two_rev_two_uses() {
let db = db::DatabaseImpl::default();
db.fibonacci(5);
let k: Vec<_> = db.query(FibonacciQuery).entries();
assert_eq!(k.len(), 6);
db.salsa_runtime().next_revision();
db.fibonacci(5);
db.fibonacci(3);
// fibonacci is a constant, so it will not be invalidated,
// hence we keep 3 and 5 but remove the rest.
db.sweep_all(SweepStrategy::discard_outdated());
assert_keys! {
db,
FibonacciQuery => (3, 5),
}
}