salsa/tests/incremental/memoized_dep_inputs.rs

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use crate::implementation::{TestContext, TestContextImpl};
use salsa::Query;
salsa::query_prototype! {
crate trait MemoizedDepInputsContext: TestContext {
fn dep_memoized2(key: ()) -> usize {
type Memoized2;
}
fn dep_memoized1(key: ()) -> usize {
type Memoized1;
}
fn dep_derived1(key: ()) -> usize {
type Derived1;
storage dependencies;
}
fn dep_input1(key: ()) -> usize {
type Input1;
storage input;
}
fn dep_input2(key: ()) -> usize {
type Input2;
storage input;
}
}
}
impl<DB: MemoizedDepInputsContext> salsa::QueryFunction<DB> for Memoized2 {
fn execute(db: &DB, (): ()) -> usize {
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db.log().add("Memoized2 invoked");
db.dep_memoized1(())
}
}
impl<DB: MemoizedDepInputsContext> salsa::QueryFunction<DB> for Memoized1 {
fn execute(db: &DB, (): ()) -> usize {
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db.log().add("Memoized1 invoked");
db.dep_derived1(()) * 2
}
}
impl<DB: MemoizedDepInputsContext> salsa::QueryFunction<DB> for Derived1 {
fn execute(db: &DB, (): ()) -> usize {
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db.log().add("Derived1 invoked");
db.dep_input1(()) / 2
}
}
#[test]
fn revalidate() {
let db = &TestContextImpl::default();
// Initial run starts from Memoized2:
let v = db.dep_memoized2(());
assert_eq!(v, 0);
db.assert_log(&["Memoized2 invoked", "Memoized1 invoked", "Derived1 invoked"]);
// After that, we first try to validate Memoized1 but wind up
// running Memoized2. Note that we don't try to validate
// Derived1, so it is invoked by Memoized1.
Input1.set(db, (), 44);
let v = db.dep_memoized2(());
assert_eq!(v, 44);
db.assert_log(&["Memoized1 invoked", "Derived1 invoked", "Memoized2 invoked"]);
// Here validation of Memoized1 succeeds so Memoized2 never runs.
Input1.set(db, (), 45);
let v = db.dep_memoized2(());
assert_eq!(v, 44);
db.assert_log(&["Memoized1 invoked", "Derived1 invoked"]);
// Here, a change to input2 doesn't affect us, so nothing runs.
Input2.set(db, (), 45);
let v = db.dep_memoized2(());
assert_eq!(v, 44);
db.assert_log(&[]);
}